Kenji Arai / mbed-os_TYBLE16

mbed-os5 only for TYBLE16

Dependents:   TYBLE16_simple_data_logger TYBLE16_MP3_Air

features/mbedtls/src/ssl_srv.c@1:9db0e321a9f4, 2019-12-31 (annotated)

Committer:
kenjiArai
Date:
Tue Dec 31 06:02:27 2019 +0000
Revision:
1:9db0e321a9f4
Parent:
0:5b88d5760320 
updated based on mbed-os5.15.0

Who changed what in which revision?

UserRevisionLine numberNew contents of line
kenjiArai 0:5b88d5760320 1 /*
kenjiArai 0:5b88d5760320 2 * SSLv3/TLSv1 server-side functions
kenjiArai 0:5b88d5760320 3 *
kenjiArai 0:5b88d5760320 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
kenjiArai 0:5b88d5760320 5 * SPDX-License-Identifier: Apache-2.0
kenjiArai 0:5b88d5760320 6 *
kenjiArai 0:5b88d5760320 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
kenjiArai 0:5b88d5760320 8 * not use this file except in compliance with the License.
kenjiArai 0:5b88d5760320 9 * You may obtain a copy of the License at
kenjiArai 0:5b88d5760320 10 *
kenjiArai 0:5b88d5760320 11 * http://www.apache.org/licenses/LICENSE-2.0
kenjiArai 0:5b88d5760320 12 *
kenjiArai 0:5b88d5760320 13 * Unless required by applicable law or agreed to in writing, software
kenjiArai 0:5b88d5760320 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
kenjiArai 0:5b88d5760320 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
kenjiArai 0:5b88d5760320 16 * See the License for the specific language governing permissions and
kenjiArai 0:5b88d5760320 17 * limitations under the License.
kenjiArai 0:5b88d5760320 18 *
kenjiArai 0:5b88d5760320 19 * This file is part of mbed TLS (https://tls.mbed.org)
kenjiArai 0:5b88d5760320 20 */
kenjiArai 0:5b88d5760320 21
kenjiArai 0:5b88d5760320 22 #if !defined(MBEDTLS_CONFIG_FILE)
kenjiArai 0:5b88d5760320 23 #include "mbedtls/config.h"
kenjiArai 0:5b88d5760320 24 #else
kenjiArai 0:5b88d5760320 25 #include MBEDTLS_CONFIG_FILE
kenjiArai 0:5b88d5760320 26 #endif
kenjiArai 0:5b88d5760320 27
kenjiArai 0:5b88d5760320 28 #if defined(MBEDTLS_SSL_SRV_C)
kenjiArai 0:5b88d5760320 29
kenjiArai 0:5b88d5760320 30 #if defined(MBEDTLS_PLATFORM_C)
kenjiArai 0:5b88d5760320 31 #include "mbedtls/platform.h"
kenjiArai 0:5b88d5760320 32 #else
kenjiArai 0:5b88d5760320 33 #include <stdlib.h>
kenjiArai 0:5b88d5760320 34 #define mbedtls_calloc calloc
kenjiArai 0:5b88d5760320 35 #define mbedtls_free free
kenjiArai 0:5b88d5760320 36 #endif
kenjiArai 0:5b88d5760320 37
kenjiArai 0:5b88d5760320 38 #include "mbedtls/debug.h"
kenjiArai 0:5b88d5760320 39 #include "mbedtls/ssl.h"
kenjiArai 0:5b88d5760320 40 #include "mbedtls/ssl_internal.h"
kenjiArai 0:5b88d5760320 41 #include "mbedtls/platform_util.h"
kenjiArai 0:5b88d5760320 42
kenjiArai 0:5b88d5760320 43 #include <string.h>
kenjiArai 0:5b88d5760320 44
kenjiArai 0:5b88d5760320 45 #if defined(MBEDTLS_ECP_C)
kenjiArai 0:5b88d5760320 46 #include "mbedtls/ecp.h"
kenjiArai 0:5b88d5760320 47 #endif
kenjiArai 0:5b88d5760320 48
kenjiArai 0:5b88d5760320 49 #if defined(MBEDTLS_HAVE_TIME)
kenjiArai 0:5b88d5760320 50 #include "mbedtls/platform_time.h"
kenjiArai 0:5b88d5760320 51 #endif
kenjiArai 0:5b88d5760320 52
kenjiArai 0:5b88d5760320 53 #if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY)
kenjiArai 0:5b88d5760320 54 int mbedtls_ssl_set_client_transport_id( mbedtls_ssl_context *ssl,
kenjiArai 0:5b88d5760320 55 const unsigned char *info,
kenjiArai 0:5b88d5760320 56 size_t ilen )
kenjiArai 0:5b88d5760320 57 {
kenjiArai 0:5b88d5760320 58 if( ssl->conf->endpoint != MBEDTLS_SSL_IS_SERVER )
kenjiArai 0:5b88d5760320 59 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
kenjiArai 0:5b88d5760320 60
kenjiArai 0:5b88d5760320 61 mbedtls_free( ssl->cli_id );
kenjiArai 0:5b88d5760320 62
kenjiArai 0:5b88d5760320 63 if( ( ssl->cli_id = mbedtls_calloc( 1, ilen ) ) == NULL )
kenjiArai 0:5b88d5760320 64 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
kenjiArai 0:5b88d5760320 65
kenjiArai 0:5b88d5760320 66 memcpy( ssl->cli_id, info, ilen );
kenjiArai 0:5b88d5760320 67 ssl->cli_id_len = ilen;
kenjiArai 0:5b88d5760320 68
kenjiArai 0:5b88d5760320 69 return( 0 );
kenjiArai 0:5b88d5760320 70 }
kenjiArai 0:5b88d5760320 71
kenjiArai 0:5b88d5760320 72 void mbedtls_ssl_conf_dtls_cookies( mbedtls_ssl_config *conf,
kenjiArai 0:5b88d5760320 73 mbedtls_ssl_cookie_write_t *f_cookie_write,
kenjiArai 0:5b88d5760320 74 mbedtls_ssl_cookie_check_t *f_cookie_check,
kenjiArai 0:5b88d5760320 75 void *p_cookie )
kenjiArai 0:5b88d5760320 76 {
kenjiArai 0:5b88d5760320 77 conf->f_cookie_write = f_cookie_write;
kenjiArai 0:5b88d5760320 78 conf->f_cookie_check = f_cookie_check;
kenjiArai 0:5b88d5760320 79 conf->p_cookie = p_cookie;
kenjiArai 0:5b88d5760320 80 }
kenjiArai 0:5b88d5760320 81 #endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY */
kenjiArai 0:5b88d5760320 82
kenjiArai 0:5b88d5760320 83 #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
kenjiArai 0:5b88d5760320 84 static int ssl_parse_servername_ext( mbedtls_ssl_context *ssl,
kenjiArai 0:5b88d5760320 85 const unsigned char *buf,
kenjiArai 0:5b88d5760320 86 size_t len )
kenjiArai 0:5b88d5760320 87 {
kenjiArai 0:5b88d5760320 88 int ret;
kenjiArai 0:5b88d5760320 89 size_t servername_list_size, hostname_len;
kenjiArai 0:5b88d5760320 90 const unsigned char *p;
kenjiArai 0:5b88d5760320 91
kenjiArai 0:5b88d5760320 92 MBEDTLS_SSL_DEBUG_MSG( 3, ( "parse ServerName extension" ) );
kenjiArai 0:5b88d5760320 93
kenjiArai 0:5b88d5760320 94 if( len < 2 )
kenjiArai 0:5b88d5760320 95 {
kenjiArai 0:5b88d5760320 96 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
kenjiArai 0:5b88d5760320 97 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 98 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
kenjiArai 0:5b88d5760320 99 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 100 }
kenjiArai 0:5b88d5760320 101 servername_list_size = ( ( buf[0] << 8 ) | ( buf[1] ) );
kenjiArai 0:5b88d5760320 102 if( servername_list_size + 2 != len )
kenjiArai 0:5b88d5760320 103 {
kenjiArai 0:5b88d5760320 104 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
kenjiArai 0:5b88d5760320 105 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 106 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
kenjiArai 0:5b88d5760320 107 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 108 }
kenjiArai 0:5b88d5760320 109
kenjiArai 0:5b88d5760320 110 p = buf + 2;
kenjiArai 0:5b88d5760320 111 while( servername_list_size > 2 )
kenjiArai 0:5b88d5760320 112 {
kenjiArai 0:5b88d5760320 113 hostname_len = ( ( p[1] << 8 ) | p[2] );
kenjiArai 0:5b88d5760320 114 if( hostname_len + 3 > servername_list_size )
kenjiArai 0:5b88d5760320 115 {
kenjiArai 0:5b88d5760320 116 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
kenjiArai 0:5b88d5760320 117 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 118 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
kenjiArai 0:5b88d5760320 119 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 120 }
kenjiArai 0:5b88d5760320 121
kenjiArai 0:5b88d5760320 122 if( p[0] == MBEDTLS_TLS_EXT_SERVERNAME_HOSTNAME )
kenjiArai 0:5b88d5760320 123 {
kenjiArai 0:5b88d5760320 124 ret = ssl->conf->f_sni( ssl->conf->p_sni,
kenjiArai 0:5b88d5760320 125 ssl, p + 3, hostname_len );
kenjiArai 0:5b88d5760320 126 if( ret != 0 )
kenjiArai 0:5b88d5760320 127 {
kenjiArai 0:5b88d5760320 128 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_sni_wrapper", ret );
kenjiArai 0:5b88d5760320 129 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 130 MBEDTLS_SSL_ALERT_MSG_UNRECOGNIZED_NAME );
kenjiArai 0:5b88d5760320 131 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 132 }
kenjiArai 0:5b88d5760320 133 return( 0 );
kenjiArai 0:5b88d5760320 134 }
kenjiArai 0:5b88d5760320 135
kenjiArai 0:5b88d5760320 136 servername_list_size -= hostname_len + 3;
kenjiArai 0:5b88d5760320 137 p += hostname_len + 3;
kenjiArai 0:5b88d5760320 138 }
kenjiArai 0:5b88d5760320 139
kenjiArai 0:5b88d5760320 140 if( servername_list_size != 0 )
kenjiArai 0:5b88d5760320 141 {
kenjiArai 0:5b88d5760320 142 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
kenjiArai 0:5b88d5760320 143 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 144 MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
kenjiArai 0:5b88d5760320 145 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 146 }
kenjiArai 0:5b88d5760320 147
kenjiArai 0:5b88d5760320 148 return( 0 );
kenjiArai 0:5b88d5760320 149 }
kenjiArai 0:5b88d5760320 150 #endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
kenjiArai 0:5b88d5760320 151
kenjiArai 0:5b88d5760320 152 #if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
kenjiArai 0:5b88d5760320 153 static int ssl_conf_has_psk_or_cb( mbedtls_ssl_config const *conf )
kenjiArai 0:5b88d5760320 154 {
kenjiArai 0:5b88d5760320 155 if( conf->f_psk != NULL )
kenjiArai 0:5b88d5760320 156 return( 1 );
kenjiArai 0:5b88d5760320 157
kenjiArai 0:5b88d5760320 158 if( conf->psk_identity_len == 0 || conf->psk_identity == NULL )
kenjiArai 0:5b88d5760320 159 return( 0 );
kenjiArai 0:5b88d5760320 160
kenjiArai 0:5b88d5760320 161 if( conf->psk != NULL && conf->psk_len != 0 )
kenjiArai 0:5b88d5760320 162 return( 1 );
kenjiArai 0:5b88d5760320 163
kenjiArai 0:5b88d5760320 164 #if defined(MBEDTLS_USE_PSA_CRYPTO)
kenjiArai 0:5b88d5760320 165 if( conf->psk_opaque != 0 )
kenjiArai 0:5b88d5760320 166 return( 1 );
kenjiArai 0:5b88d5760320 167 #endif /* MBEDTLS_USE_PSA_CRYPTO */
kenjiArai 0:5b88d5760320 168
kenjiArai 0:5b88d5760320 169 return( 0 );
kenjiArai 0:5b88d5760320 170 }
kenjiArai 0:5b88d5760320 171
kenjiArai 0:5b88d5760320 172 #if defined(MBEDTLS_USE_PSA_CRYPTO)
kenjiArai 0:5b88d5760320 173 static int ssl_use_opaque_psk( mbedtls_ssl_context const *ssl )
kenjiArai 0:5b88d5760320 174 {
kenjiArai 0:5b88d5760320 175 if( ssl->conf->f_psk != NULL )
kenjiArai 0:5b88d5760320 176 {
kenjiArai 0:5b88d5760320 177 /* If we've used a callback to select the PSK,
kenjiArai 0:5b88d5760320 178 * the static configuration is irrelevant. */
kenjiArai 0:5b88d5760320 179
kenjiArai 0:5b88d5760320 180 if( ssl->handshake->psk_opaque != 0 )
kenjiArai 0:5b88d5760320 181 return( 1 );
kenjiArai 0:5b88d5760320 182
kenjiArai 0:5b88d5760320 183 return( 0 );
kenjiArai 0:5b88d5760320 184 }
kenjiArai 0:5b88d5760320 185
kenjiArai 0:5b88d5760320 186 if( ssl->conf->psk_opaque != 0 )
kenjiArai 0:5b88d5760320 187 return( 1 );
kenjiArai 0:5b88d5760320 188
kenjiArai 0:5b88d5760320 189 return( 0 );
kenjiArai 0:5b88d5760320 190 }
kenjiArai 0:5b88d5760320 191 #endif /* MBEDTLS_USE_PSA_CRYPTO */
kenjiArai 0:5b88d5760320 192 #endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */
kenjiArai 0:5b88d5760320 193
kenjiArai 0:5b88d5760320 194 static int ssl_parse_renegotiation_info( mbedtls_ssl_context *ssl,
kenjiArai 0:5b88d5760320 195 const unsigned char *buf,
kenjiArai 0:5b88d5760320 196 size_t len )
kenjiArai 0:5b88d5760320 197 {
kenjiArai 0:5b88d5760320 198 #if defined(MBEDTLS_SSL_RENEGOTIATION)
kenjiArai 0:5b88d5760320 199 if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE )
kenjiArai 0:5b88d5760320 200 {
kenjiArai 0:5b88d5760320 201 /* Check verify-data in constant-time. The length OTOH is no secret */
kenjiArai 0:5b88d5760320 202 if( len != 1 + ssl->verify_data_len ||
kenjiArai 0:5b88d5760320 203 buf[0] != ssl->verify_data_len ||
kenjiArai 0:5b88d5760320 204 mbedtls_ssl_safer_memcmp( buf + 1, ssl->peer_verify_data,
kenjiArai 0:5b88d5760320 205 ssl->verify_data_len ) != 0 )
kenjiArai 0:5b88d5760320 206 {
kenjiArai 0:5b88d5760320 207 MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-matching renegotiation info" ) );
kenjiArai 0:5b88d5760320 208 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 209 MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
kenjiArai 0:5b88d5760320 210 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 211 }
kenjiArai 0:5b88d5760320 212 }
kenjiArai 0:5b88d5760320 213 else
kenjiArai 0:5b88d5760320 214 #endif /* MBEDTLS_SSL_RENEGOTIATION */
kenjiArai 0:5b88d5760320 215 {
kenjiArai 0:5b88d5760320 216 if( len != 1 || buf[0] != 0x0 )
kenjiArai 0:5b88d5760320 217 {
kenjiArai 0:5b88d5760320 218 MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-zero length renegotiation info" ) );
kenjiArai 0:5b88d5760320 219 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 220 MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
kenjiArai 0:5b88d5760320 221 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 222 }
kenjiArai 0:5b88d5760320 223
kenjiArai 0:5b88d5760320 224 ssl->secure_renegotiation = MBEDTLS_SSL_SECURE_RENEGOTIATION;
kenjiArai 0:5b88d5760320 225 }
kenjiArai 0:5b88d5760320 226
kenjiArai 0:5b88d5760320 227 return( 0 );
kenjiArai 0:5b88d5760320 228 }
kenjiArai 0:5b88d5760320 229
kenjiArai 0:5b88d5760320 230 #if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
kenjiArai 0:5b88d5760320 231 defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
kenjiArai 0:5b88d5760320 232
kenjiArai 0:5b88d5760320 233 /*
kenjiArai 0:5b88d5760320 234 * Status of the implementation of signature-algorithms extension:
kenjiArai 0:5b88d5760320 235 *
kenjiArai 0:5b88d5760320 236 * Currently, we are only considering the signature-algorithm extension
kenjiArai 0:5b88d5760320 237 * to pick a ciphersuite which allows us to send the ServerKeyExchange
kenjiArai 0:5b88d5760320 238 * message with a signature-hash combination that the user allows.
kenjiArai 0:5b88d5760320 239 *
kenjiArai 0:5b88d5760320 240 * We do *not* check whether all certificates in our certificate
kenjiArai 0:5b88d5760320 241 * chain are signed with an allowed signature-hash pair.
kenjiArai 0:5b88d5760320 242 * This needs to be done at a later stage.
kenjiArai 0:5b88d5760320 243 *
kenjiArai 0:5b88d5760320 244 */
kenjiArai 0:5b88d5760320 245 static int ssl_parse_signature_algorithms_ext( mbedtls_ssl_context *ssl,
kenjiArai 0:5b88d5760320 246 const unsigned char *buf,
kenjiArai 0:5b88d5760320 247 size_t len )
kenjiArai 0:5b88d5760320 248 {
kenjiArai 0:5b88d5760320 249 size_t sig_alg_list_size;
kenjiArai 0:5b88d5760320 250
kenjiArai 0:5b88d5760320 251 const unsigned char *p;
kenjiArai 0:5b88d5760320 252 const unsigned char *end = buf + len;
kenjiArai 0:5b88d5760320 253
kenjiArai 0:5b88d5760320 254 mbedtls_md_type_t md_cur;
kenjiArai 0:5b88d5760320 255 mbedtls_pk_type_t sig_cur;
kenjiArai 0:5b88d5760320 256
kenjiArai 0:5b88d5760320 257 if ( len < 2 ) {
kenjiArai 0:5b88d5760320 258 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
kenjiArai 0:5b88d5760320 259 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 260 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
kenjiArai 0:5b88d5760320 261 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 262 }
kenjiArai 0:5b88d5760320 263 sig_alg_list_size = ( ( buf[0] << 8 ) | ( buf[1] ) );
kenjiArai 0:5b88d5760320 264 if( sig_alg_list_size + 2 != len ||
kenjiArai 0:5b88d5760320 265 sig_alg_list_size % 2 != 0 )
kenjiArai 0:5b88d5760320 266 {
kenjiArai 0:5b88d5760320 267 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
kenjiArai 0:5b88d5760320 268 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 269 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
kenjiArai 0:5b88d5760320 270 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 271 }
kenjiArai 0:5b88d5760320 272
kenjiArai 0:5b88d5760320 273 /* Currently we only guarantee signing the ServerKeyExchange message according
kenjiArai 0:5b88d5760320 274 * to the constraints specified in this extension (see above), so it suffices
kenjiArai 0:5b88d5760320 275 * to remember only one suitable hash for each possible signature algorithm.
kenjiArai 0:5b88d5760320 276 *
kenjiArai 0:5b88d5760320 277 * This will change when we also consider certificate signatures,
kenjiArai 0:5b88d5760320 278 * in which case we will need to remember the whole signature-hash
kenjiArai 0:5b88d5760320 279 * pair list from the extension.
kenjiArai 0:5b88d5760320 280 */
kenjiArai 0:5b88d5760320 281
kenjiArai 0:5b88d5760320 282 for( p = buf + 2; p < end; p += 2 )
kenjiArai 0:5b88d5760320 283 {
kenjiArai 0:5b88d5760320 284 /* Silently ignore unknown signature or hash algorithms. */
kenjiArai 0:5b88d5760320 285
kenjiArai 0:5b88d5760320 286 if( ( sig_cur = mbedtls_ssl_pk_alg_from_sig( p[1] ) ) == MBEDTLS_PK_NONE )
kenjiArai 0:5b88d5760320 287 {
kenjiArai 0:5b88d5760320 288 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, signature_algorithm ext"
kenjiArai 0:5b88d5760320 289 " unknown sig alg encoding %d", p[1] ) );
kenjiArai 0:5b88d5760320 290 continue;
kenjiArai 0:5b88d5760320 291 }
kenjiArai 0:5b88d5760320 292
kenjiArai 0:5b88d5760320 293 /* Check if we support the hash the user proposes */
kenjiArai 0:5b88d5760320 294 md_cur = mbedtls_ssl_md_alg_from_hash( p[0] );
kenjiArai 0:5b88d5760320 295 if( md_cur == MBEDTLS_MD_NONE )
kenjiArai 0:5b88d5760320 296 {
kenjiArai 0:5b88d5760320 297 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, signature_algorithm ext:"
kenjiArai 0:5b88d5760320 298 " unknown hash alg encoding %d", p[0] ) );
kenjiArai 0:5b88d5760320 299 continue;
kenjiArai 0:5b88d5760320 300 }
kenjiArai 0:5b88d5760320 301
kenjiArai 0:5b88d5760320 302 if( mbedtls_ssl_check_sig_hash( ssl, md_cur ) == 0 )
kenjiArai 0:5b88d5760320 303 {
kenjiArai 0:5b88d5760320 304 mbedtls_ssl_sig_hash_set_add( &ssl->handshake->hash_algs, sig_cur, md_cur );
kenjiArai 0:5b88d5760320 305 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, signature_algorithm ext:"
kenjiArai 0:5b88d5760320 306 " match sig %d and hash %d",
kenjiArai 0:5b88d5760320 307 sig_cur, md_cur ) );
kenjiArai 0:5b88d5760320 308 }
kenjiArai 0:5b88d5760320 309 else
kenjiArai 0:5b88d5760320 310 {
kenjiArai 0:5b88d5760320 311 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, signature_algorithm ext: "
kenjiArai 0:5b88d5760320 312 "hash alg %d not supported", md_cur ) );
kenjiArai 0:5b88d5760320 313 }
kenjiArai 0:5b88d5760320 314 }
kenjiArai 0:5b88d5760320 315
kenjiArai 0:5b88d5760320 316 return( 0 );
kenjiArai 0:5b88d5760320 317 }
kenjiArai 0:5b88d5760320 318 #endif /* MBEDTLS_SSL_PROTO_TLS1_2 &&
kenjiArai 0:5b88d5760320 319 MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */
kenjiArai 0:5b88d5760320 320
kenjiArai 0:5b88d5760320 321 #if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \
kenjiArai 0:5b88d5760320 322 defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
kenjiArai 0:5b88d5760320 323 static int ssl_parse_supported_elliptic_curves( mbedtls_ssl_context *ssl,
kenjiArai 0:5b88d5760320 324 const unsigned char *buf,
kenjiArai 0:5b88d5760320 325 size_t len )
kenjiArai 0:5b88d5760320 326 {
kenjiArai 0:5b88d5760320 327 size_t list_size, our_size;
kenjiArai 0:5b88d5760320 328 const unsigned char *p;
kenjiArai 0:5b88d5760320 329 const mbedtls_ecp_curve_info *curve_info, **curves;
kenjiArai 0:5b88d5760320 330
kenjiArai 0:5b88d5760320 331 if ( len < 2 ) {
kenjiArai 0:5b88d5760320 332 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
kenjiArai 0:5b88d5760320 333 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 334 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
kenjiArai 0:5b88d5760320 335 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 336 }
kenjiArai 0:5b88d5760320 337 list_size = ( ( buf[0] << 8 ) | ( buf[1] ) );
kenjiArai 0:5b88d5760320 338 if( list_size + 2 != len ||
kenjiArai 0:5b88d5760320 339 list_size % 2 != 0 )
kenjiArai 0:5b88d5760320 340 {
kenjiArai 0:5b88d5760320 341 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
kenjiArai 0:5b88d5760320 342 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 343 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
kenjiArai 0:5b88d5760320 344 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 345 }
kenjiArai 0:5b88d5760320 346
kenjiArai 0:5b88d5760320 347 /* Should never happen unless client duplicates the extension */
kenjiArai 0:5b88d5760320 348 if( ssl->handshake->curves != NULL )
kenjiArai 0:5b88d5760320 349 {
kenjiArai 0:5b88d5760320 350 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
kenjiArai 0:5b88d5760320 351 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 352 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
kenjiArai 0:5b88d5760320 353 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 354 }
kenjiArai 0:5b88d5760320 355
kenjiArai 0:5b88d5760320 356 /* Don't allow our peer to make us allocate too much memory,
kenjiArai 0:5b88d5760320 357 * and leave room for a final 0 */
kenjiArai 0:5b88d5760320 358 our_size = list_size / 2 + 1;
kenjiArai 0:5b88d5760320 359 if( our_size > MBEDTLS_ECP_DP_MAX )
kenjiArai 0:5b88d5760320 360 our_size = MBEDTLS_ECP_DP_MAX;
kenjiArai 0:5b88d5760320 361
kenjiArai 0:5b88d5760320 362 if( ( curves = mbedtls_calloc( our_size, sizeof( *curves ) ) ) == NULL )
kenjiArai 0:5b88d5760320 363 {
kenjiArai 0:5b88d5760320 364 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 365 MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR );
kenjiArai 0:5b88d5760320 366 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
kenjiArai 0:5b88d5760320 367 }
kenjiArai 0:5b88d5760320 368
kenjiArai 0:5b88d5760320 369 ssl->handshake->curves = curves;
kenjiArai 0:5b88d5760320 370
kenjiArai 0:5b88d5760320 371 p = buf + 2;
kenjiArai 0:5b88d5760320 372 while( list_size > 0 && our_size > 1 )
kenjiArai 0:5b88d5760320 373 {
kenjiArai 0:5b88d5760320 374 curve_info = mbedtls_ecp_curve_info_from_tls_id( ( p[0] << 8 ) | p[1] );
kenjiArai 0:5b88d5760320 375
kenjiArai 0:5b88d5760320 376 if( curve_info != NULL )
kenjiArai 0:5b88d5760320 377 {
kenjiArai 0:5b88d5760320 378 *curves++ = curve_info;
kenjiArai 0:5b88d5760320 379 our_size--;
kenjiArai 0:5b88d5760320 380 }
kenjiArai 0:5b88d5760320 381
kenjiArai 0:5b88d5760320 382 list_size -= 2;
kenjiArai 0:5b88d5760320 383 p += 2;
kenjiArai 0:5b88d5760320 384 }
kenjiArai 0:5b88d5760320 385
kenjiArai 0:5b88d5760320 386 return( 0 );
kenjiArai 0:5b88d5760320 387 }
kenjiArai 0:5b88d5760320 388
kenjiArai 0:5b88d5760320 389 static int ssl_parse_supported_point_formats( mbedtls_ssl_context *ssl,
kenjiArai 0:5b88d5760320 390 const unsigned char *buf,
kenjiArai 0:5b88d5760320 391 size_t len )
kenjiArai 0:5b88d5760320 392 {
kenjiArai 0:5b88d5760320 393 size_t list_size;
kenjiArai 0:5b88d5760320 394 const unsigned char *p;
kenjiArai 0:5b88d5760320 395
kenjiArai 0:5b88d5760320 396 if( len == 0 || (size_t)( buf[0] + 1 ) != len )
kenjiArai 0:5b88d5760320 397 {
kenjiArai 0:5b88d5760320 398 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
kenjiArai 0:5b88d5760320 399 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 400 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
kenjiArai 0:5b88d5760320 401 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 402 }
kenjiArai 0:5b88d5760320 403 list_size = buf[0];
kenjiArai 0:5b88d5760320 404
kenjiArai 0:5b88d5760320 405 p = buf + 1;
kenjiArai 0:5b88d5760320 406 while( list_size > 0 )
kenjiArai 0:5b88d5760320 407 {
kenjiArai 0:5b88d5760320 408 if( p[0] == MBEDTLS_ECP_PF_UNCOMPRESSED ||
kenjiArai 0:5b88d5760320 409 p[0] == MBEDTLS_ECP_PF_COMPRESSED )
kenjiArai 0:5b88d5760320 410 {
kenjiArai 0:5b88d5760320 411 #if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C)
kenjiArai 0:5b88d5760320 412 ssl->handshake->ecdh_ctx.point_format = p[0];
kenjiArai 0:5b88d5760320 413 #endif
kenjiArai 0:5b88d5760320 414 #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
kenjiArai 0:5b88d5760320 415 ssl->handshake->ecjpake_ctx.point_format = p[0];
kenjiArai 0:5b88d5760320 416 #endif
kenjiArai 0:5b88d5760320 417 MBEDTLS_SSL_DEBUG_MSG( 4, ( "point format selected: %d", p[0] ) );
kenjiArai 0:5b88d5760320 418 return( 0 );
kenjiArai 0:5b88d5760320 419 }
kenjiArai 0:5b88d5760320 420
kenjiArai 0:5b88d5760320 421 list_size--;
kenjiArai 0:5b88d5760320 422 p++;
kenjiArai 0:5b88d5760320 423 }
kenjiArai 0:5b88d5760320 424
kenjiArai 0:5b88d5760320 425 return( 0 );
kenjiArai 0:5b88d5760320 426 }
kenjiArai 0:5b88d5760320 427 #endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C ||
kenjiArai 0:5b88d5760320 428 MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
kenjiArai 0:5b88d5760320 429
kenjiArai 0:5b88d5760320 430 #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
kenjiArai 0:5b88d5760320 431 static int ssl_parse_ecjpake_kkpp( mbedtls_ssl_context *ssl,
kenjiArai 0:5b88d5760320 432 const unsigned char *buf,
kenjiArai 0:5b88d5760320 433 size_t len )
kenjiArai 0:5b88d5760320 434 {
kenjiArai 0:5b88d5760320 435 int ret;
kenjiArai 0:5b88d5760320 436
kenjiArai 0:5b88d5760320 437 if( mbedtls_ecjpake_check( &ssl->handshake->ecjpake_ctx ) != 0 )
kenjiArai 0:5b88d5760320 438 {
kenjiArai 0:5b88d5760320 439 MBEDTLS_SSL_DEBUG_MSG( 3, ( "skip ecjpake kkpp extension" ) );
kenjiArai 0:5b88d5760320 440 return( 0 );
kenjiArai 0:5b88d5760320 441 }
kenjiArai 0:5b88d5760320 442
kenjiArai 0:5b88d5760320 443 if( ( ret = mbedtls_ecjpake_read_round_one( &ssl->handshake->ecjpake_ctx,
kenjiArai 0:5b88d5760320 444 buf, len ) ) != 0 )
kenjiArai 0:5b88d5760320 445 {
kenjiArai 0:5b88d5760320 446 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_read_round_one", ret );
kenjiArai 0:5b88d5760320 447 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 448 MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
kenjiArai 0:5b88d5760320 449 return( ret );
kenjiArai 0:5b88d5760320 450 }
kenjiArai 0:5b88d5760320 451
kenjiArai 0:5b88d5760320 452 /* Only mark the extension as OK when we're sure it is */
kenjiArai 0:5b88d5760320 453 ssl->handshake->cli_exts |= MBEDTLS_TLS_EXT_ECJPAKE_KKPP_OK;
kenjiArai 0:5b88d5760320 454
kenjiArai 0:5b88d5760320 455 return( 0 );
kenjiArai 0:5b88d5760320 456 }
kenjiArai 0:5b88d5760320 457 #endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
kenjiArai 0:5b88d5760320 458
kenjiArai 0:5b88d5760320 459 #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
kenjiArai 0:5b88d5760320 460 static int ssl_parse_max_fragment_length_ext( mbedtls_ssl_context *ssl,
kenjiArai 0:5b88d5760320 461 const unsigned char *buf,
kenjiArai 0:5b88d5760320 462 size_t len )
kenjiArai 0:5b88d5760320 463 {
kenjiArai 0:5b88d5760320 464 if( len != 1 || buf[0] >= MBEDTLS_SSL_MAX_FRAG_LEN_INVALID )
kenjiArai 0:5b88d5760320 465 {
kenjiArai 0:5b88d5760320 466 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
kenjiArai 0:5b88d5760320 467 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 468 MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
kenjiArai 0:5b88d5760320 469 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 470 }
kenjiArai 0:5b88d5760320 471
kenjiArai 0:5b88d5760320 472 ssl->session_negotiate->mfl_code = buf[0];
kenjiArai 0:5b88d5760320 473
kenjiArai 0:5b88d5760320 474 return( 0 );
kenjiArai 0:5b88d5760320 475 }
kenjiArai 0:5b88d5760320 476 #endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
kenjiArai 0:5b88d5760320 477
kenjiArai 0:5b88d5760320 478 #if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
kenjiArai 0:5b88d5760320 479 static int ssl_parse_cid_ext( mbedtls_ssl_context *ssl,
kenjiArai 0:5b88d5760320 480 const unsigned char *buf,
kenjiArai 0:5b88d5760320 481 size_t len )
kenjiArai 0:5b88d5760320 482 {
kenjiArai 0:5b88d5760320 483 size_t peer_cid_len;
kenjiArai 0:5b88d5760320 484
kenjiArai 0:5b88d5760320 485 /* CID extension only makes sense in DTLS */
kenjiArai 0:5b88d5760320 486 if( ssl->conf->transport != MBEDTLS_SSL_TRANSPORT_DATAGRAM )
kenjiArai 0:5b88d5760320 487 {
kenjiArai 0:5b88d5760320 488 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
kenjiArai 0:5b88d5760320 489 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 490 MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
kenjiArai 0:5b88d5760320 491 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 492 }
kenjiArai 0:5b88d5760320 493
kenjiArai 0:5b88d5760320 494 /*
kenjiArai 0:5b88d5760320 495 * Quoting draft-ietf-tls-dtls-connection-id-05
kenjiArai 0:5b88d5760320 496 * https://tools.ietf.org/html/draft-ietf-tls-dtls-connection-id-05
kenjiArai 0:5b88d5760320 497 *
kenjiArai 0:5b88d5760320 498 * struct {
kenjiArai 0:5b88d5760320 499 * opaque cid<0..2^8-1>;
kenjiArai 0:5b88d5760320 500 * } ConnectionId;
kenjiArai 0:5b88d5760320 501 */
kenjiArai 0:5b88d5760320 502
kenjiArai 0:5b88d5760320 503 if( len < 1 )
kenjiArai 0:5b88d5760320 504 {
kenjiArai 0:5b88d5760320 505 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
kenjiArai 0:5b88d5760320 506 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 507 MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
kenjiArai 0:5b88d5760320 508 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 509 }
kenjiArai 0:5b88d5760320 510
kenjiArai 0:5b88d5760320 511 peer_cid_len = *buf++;
kenjiArai 0:5b88d5760320 512 len--;
kenjiArai 0:5b88d5760320 513
kenjiArai 0:5b88d5760320 514 if( len != peer_cid_len )
kenjiArai 0:5b88d5760320 515 {
kenjiArai 0:5b88d5760320 516 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
kenjiArai 0:5b88d5760320 517 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 518 MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
kenjiArai 0:5b88d5760320 519 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 520 }
kenjiArai 0:5b88d5760320 521
kenjiArai 0:5b88d5760320 522 /* Ignore CID if the user has disabled its use. */
kenjiArai 0:5b88d5760320 523 if( ssl->negotiate_cid == MBEDTLS_SSL_CID_DISABLED )
kenjiArai 0:5b88d5760320 524 {
kenjiArai 0:5b88d5760320 525 /* Leave ssl->handshake->cid_in_use in its default
kenjiArai 0:5b88d5760320 526 * value of MBEDTLS_SSL_CID_DISABLED. */
kenjiArai 0:5b88d5760320 527 MBEDTLS_SSL_DEBUG_MSG( 3, ( "Client sent CID extension, but CID disabled" ) );
kenjiArai 0:5b88d5760320 528 return( 0 );
kenjiArai 0:5b88d5760320 529 }
kenjiArai 0:5b88d5760320 530
kenjiArai 0:5b88d5760320 531 if( peer_cid_len > MBEDTLS_SSL_CID_OUT_LEN_MAX )
kenjiArai 0:5b88d5760320 532 {
kenjiArai 0:5b88d5760320 533 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
kenjiArai 0:5b88d5760320 534 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 535 MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
kenjiArai 0:5b88d5760320 536 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 537 }
kenjiArai 0:5b88d5760320 538
kenjiArai 0:5b88d5760320 539 ssl->handshake->cid_in_use = MBEDTLS_SSL_CID_ENABLED;
kenjiArai 0:5b88d5760320 540 ssl->handshake->peer_cid_len = (uint8_t) peer_cid_len;
kenjiArai 0:5b88d5760320 541 memcpy( ssl->handshake->peer_cid, buf, peer_cid_len );
kenjiArai 0:5b88d5760320 542
kenjiArai 0:5b88d5760320 543 MBEDTLS_SSL_DEBUG_MSG( 3, ( "Use of CID extension negotiated" ) );
kenjiArai 0:5b88d5760320 544 MBEDTLS_SSL_DEBUG_BUF( 3, "Client CID", buf, peer_cid_len );
kenjiArai 0:5b88d5760320 545
kenjiArai 0:5b88d5760320 546 return( 0 );
kenjiArai 0:5b88d5760320 547 }
kenjiArai 0:5b88d5760320 548 #endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
kenjiArai 0:5b88d5760320 549
kenjiArai 0:5b88d5760320 550 #if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
kenjiArai 0:5b88d5760320 551 static int ssl_parse_truncated_hmac_ext( mbedtls_ssl_context *ssl,
kenjiArai 0:5b88d5760320 552 const unsigned char *buf,
kenjiArai 0:5b88d5760320 553 size_t len )
kenjiArai 0:5b88d5760320 554 {
kenjiArai 0:5b88d5760320 555 if( len != 0 )
kenjiArai 0:5b88d5760320 556 {
kenjiArai 0:5b88d5760320 557 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
kenjiArai 0:5b88d5760320 558 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 559 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
kenjiArai 0:5b88d5760320 560 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 561 }
kenjiArai 0:5b88d5760320 562
kenjiArai 0:5b88d5760320 563 ((void) buf);
kenjiArai 0:5b88d5760320 564
kenjiArai 0:5b88d5760320 565 if( ssl->conf->trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_ENABLED )
kenjiArai 0:5b88d5760320 566 ssl->session_negotiate->trunc_hmac = MBEDTLS_SSL_TRUNC_HMAC_ENABLED;
kenjiArai 0:5b88d5760320 567
kenjiArai 0:5b88d5760320 568 return( 0 );
kenjiArai 0:5b88d5760320 569 }
kenjiArai 0:5b88d5760320 570 #endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
kenjiArai 0:5b88d5760320 571
kenjiArai 0:5b88d5760320 572 #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
kenjiArai 0:5b88d5760320 573 static int ssl_parse_encrypt_then_mac_ext( mbedtls_ssl_context *ssl,
kenjiArai 0:5b88d5760320 574 const unsigned char *buf,
kenjiArai 0:5b88d5760320 575 size_t len )
kenjiArai 0:5b88d5760320 576 {
kenjiArai 0:5b88d5760320 577 if( len != 0 )
kenjiArai 0:5b88d5760320 578 {
kenjiArai 0:5b88d5760320 579 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
kenjiArai 0:5b88d5760320 580 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 581 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
kenjiArai 0:5b88d5760320 582 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 583 }
kenjiArai 0:5b88d5760320 584
kenjiArai 0:5b88d5760320 585 ((void) buf);
kenjiArai 0:5b88d5760320 586
kenjiArai 0:5b88d5760320 587 if( ssl->conf->encrypt_then_mac == MBEDTLS_SSL_ETM_ENABLED &&
kenjiArai 0:5b88d5760320 588 ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_0 )
kenjiArai 0:5b88d5760320 589 {
kenjiArai 0:5b88d5760320 590 ssl->session_negotiate->encrypt_then_mac = MBEDTLS_SSL_ETM_ENABLED;
kenjiArai 0:5b88d5760320 591 }
kenjiArai 0:5b88d5760320 592
kenjiArai 0:5b88d5760320 593 return( 0 );
kenjiArai 0:5b88d5760320 594 }
kenjiArai 0:5b88d5760320 595 #endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
kenjiArai 0:5b88d5760320 596
kenjiArai 0:5b88d5760320 597 #if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
kenjiArai 0:5b88d5760320 598 static int ssl_parse_extended_ms_ext( mbedtls_ssl_context *ssl,
kenjiArai 0:5b88d5760320 599 const unsigned char *buf,
kenjiArai 0:5b88d5760320 600 size_t len )
kenjiArai 0:5b88d5760320 601 {
kenjiArai 0:5b88d5760320 602 if( len != 0 )
kenjiArai 0:5b88d5760320 603 {
kenjiArai 0:5b88d5760320 604 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
kenjiArai 0:5b88d5760320 605 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 606 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
kenjiArai 0:5b88d5760320 607 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 608 }
kenjiArai 0:5b88d5760320 609
kenjiArai 0:5b88d5760320 610 ((void) buf);
kenjiArai 0:5b88d5760320 611
kenjiArai 0:5b88d5760320 612 if( ssl->conf->extended_ms == MBEDTLS_SSL_EXTENDED_MS_ENABLED &&
kenjiArai 0:5b88d5760320 613 ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_0 )
kenjiArai 0:5b88d5760320 614 {
kenjiArai 0:5b88d5760320 615 ssl->handshake->extended_ms = MBEDTLS_SSL_EXTENDED_MS_ENABLED;
kenjiArai 0:5b88d5760320 616 }
kenjiArai 0:5b88d5760320 617
kenjiArai 0:5b88d5760320 618 return( 0 );
kenjiArai 0:5b88d5760320 619 }
kenjiArai 0:5b88d5760320 620 #endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */
kenjiArai 0:5b88d5760320 621
kenjiArai 0:5b88d5760320 622 #if defined(MBEDTLS_SSL_SESSION_TICKETS)
kenjiArai 0:5b88d5760320 623 static int ssl_parse_session_ticket_ext( mbedtls_ssl_context *ssl,
kenjiArai 0:5b88d5760320 624 unsigned char *buf,
kenjiArai 0:5b88d5760320 625 size_t len )
kenjiArai 0:5b88d5760320 626 {
kenjiArai 0:5b88d5760320 627 int ret;
kenjiArai 0:5b88d5760320 628 mbedtls_ssl_session session;
kenjiArai 0:5b88d5760320 629
kenjiArai 0:5b88d5760320 630 mbedtls_ssl_session_init( &session );
kenjiArai 0:5b88d5760320 631
kenjiArai 0:5b88d5760320 632 if( ssl->conf->f_ticket_parse == NULL ||
kenjiArai 0:5b88d5760320 633 ssl->conf->f_ticket_write == NULL )
kenjiArai 0:5b88d5760320 634 {
kenjiArai 0:5b88d5760320 635 return( 0 );
kenjiArai 0:5b88d5760320 636 }
kenjiArai 0:5b88d5760320 637
kenjiArai 0:5b88d5760320 638 /* Remember the client asked us to send a new ticket */
kenjiArai 0:5b88d5760320 639 ssl->handshake->new_session_ticket = 1;
kenjiArai 0:5b88d5760320 640
kenjiArai 0:5b88d5760320 641 MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket length: %d", len ) );
kenjiArai 0:5b88d5760320 642
kenjiArai 0:5b88d5760320 643 if( len == 0 )
kenjiArai 0:5b88d5760320 644 return( 0 );
kenjiArai 0:5b88d5760320 645
kenjiArai 0:5b88d5760320 646 #if defined(MBEDTLS_SSL_RENEGOTIATION)
kenjiArai 0:5b88d5760320 647 if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE )
kenjiArai 0:5b88d5760320 648 {
kenjiArai 0:5b88d5760320 649 MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket rejected: renegotiating" ) );
kenjiArai 0:5b88d5760320 650 return( 0 );
kenjiArai 0:5b88d5760320 651 }
kenjiArai 0:5b88d5760320 652 #endif /* MBEDTLS_SSL_RENEGOTIATION */
kenjiArai 0:5b88d5760320 653
kenjiArai 0:5b88d5760320 654 /*
kenjiArai 0:5b88d5760320 655 * Failures are ok: just ignore the ticket and proceed.
kenjiArai 0:5b88d5760320 656 */
kenjiArai 0:5b88d5760320 657 if( ( ret = ssl->conf->f_ticket_parse( ssl->conf->p_ticket, &session,
kenjiArai 0:5b88d5760320 658 buf, len ) ) != 0 )
kenjiArai 0:5b88d5760320 659 {
kenjiArai 0:5b88d5760320 660 mbedtls_ssl_session_free( &session );
kenjiArai 0:5b88d5760320 661
kenjiArai 0:5b88d5760320 662 if( ret == MBEDTLS_ERR_SSL_INVALID_MAC )
kenjiArai 0:5b88d5760320 663 MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket is not authentic" ) );
kenjiArai 0:5b88d5760320 664 else if( ret == MBEDTLS_ERR_SSL_SESSION_TICKET_EXPIRED )
kenjiArai 0:5b88d5760320 665 MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket is expired" ) );
kenjiArai 0:5b88d5760320 666 else
kenjiArai 0:5b88d5760320 667 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_ticket_parse", ret );
kenjiArai 0:5b88d5760320 668
kenjiArai 0:5b88d5760320 669 return( 0 );
kenjiArai 0:5b88d5760320 670 }
kenjiArai 0:5b88d5760320 671
kenjiArai 0:5b88d5760320 672 /*
kenjiArai 0:5b88d5760320 673 * Keep the session ID sent by the client, since we MUST send it back to
kenjiArai 0:5b88d5760320 674 * inform them we're accepting the ticket (RFC 5077 section 3.4)
kenjiArai 0:5b88d5760320 675 */
kenjiArai 0:5b88d5760320 676 session.id_len = ssl->session_negotiate->id_len;
kenjiArai 0:5b88d5760320 677 memcpy( &session.id, ssl->session_negotiate->id, session.id_len );
kenjiArai 0:5b88d5760320 678
kenjiArai 0:5b88d5760320 679 mbedtls_ssl_session_free( ssl->session_negotiate );
kenjiArai 0:5b88d5760320 680 memcpy( ssl->session_negotiate, &session, sizeof( mbedtls_ssl_session ) );
kenjiArai 0:5b88d5760320 681
kenjiArai 0:5b88d5760320 682 /* Zeroize instead of free as we copied the content */
kenjiArai 0:5b88d5760320 683 mbedtls_platform_zeroize( &session, sizeof( mbedtls_ssl_session ) );
kenjiArai 0:5b88d5760320 684
kenjiArai 0:5b88d5760320 685 MBEDTLS_SSL_DEBUG_MSG( 3, ( "session successfully restored from ticket" ) );
kenjiArai 0:5b88d5760320 686
kenjiArai 0:5b88d5760320 687 ssl->handshake->resume = 1;
kenjiArai 0:5b88d5760320 688
kenjiArai 0:5b88d5760320 689 /* Don't send a new ticket after all, this one is OK */
kenjiArai 0:5b88d5760320 690 ssl->handshake->new_session_ticket = 0;
kenjiArai 0:5b88d5760320 691
kenjiArai 0:5b88d5760320 692 return( 0 );
kenjiArai 0:5b88d5760320 693 }
kenjiArai 0:5b88d5760320 694 #endif /* MBEDTLS_SSL_SESSION_TICKETS */
kenjiArai 0:5b88d5760320 695
kenjiArai 0:5b88d5760320 696 #if defined(MBEDTLS_SSL_ALPN)
kenjiArai 0:5b88d5760320 697 static int ssl_parse_alpn_ext( mbedtls_ssl_context *ssl,
kenjiArai 0:5b88d5760320 698 const unsigned char *buf, size_t len )
kenjiArai 0:5b88d5760320 699 {
kenjiArai 0:5b88d5760320 700 size_t list_len, cur_len, ours_len;
kenjiArai 0:5b88d5760320 701 const unsigned char *theirs, *start, *end;
kenjiArai 0:5b88d5760320 702 const char **ours;
kenjiArai 0:5b88d5760320 703
kenjiArai 0:5b88d5760320 704 /* If ALPN not configured, just ignore the extension */
kenjiArai 0:5b88d5760320 705 if( ssl->conf->alpn_list == NULL )
kenjiArai 0:5b88d5760320 706 return( 0 );
kenjiArai 0:5b88d5760320 707
kenjiArai 0:5b88d5760320 708 /*
kenjiArai 0:5b88d5760320 709 * opaque ProtocolName<1..2^8-1>;
kenjiArai 0:5b88d5760320 710 *
kenjiArai 0:5b88d5760320 711 * struct {
kenjiArai 0:5b88d5760320 712 * ProtocolName protocol_name_list<2..2^16-1>
kenjiArai 0:5b88d5760320 713 * } ProtocolNameList;
kenjiArai 0:5b88d5760320 714 */
kenjiArai 0:5b88d5760320 715
kenjiArai 0:5b88d5760320 716 /* Min length is 2 (list_len) + 1 (name_len) + 1 (name) */
kenjiArai 0:5b88d5760320 717 if( len < 4 )
kenjiArai 0:5b88d5760320 718 {
kenjiArai 0:5b88d5760320 719 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 720 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
kenjiArai 0:5b88d5760320 721 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 722 }
kenjiArai 0:5b88d5760320 723
kenjiArai 0:5b88d5760320 724 list_len = ( buf[0] << 8 ) | buf[1];
kenjiArai 0:5b88d5760320 725 if( list_len != len - 2 )
kenjiArai 0:5b88d5760320 726 {
kenjiArai 0:5b88d5760320 727 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 728 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
kenjiArai 0:5b88d5760320 729 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 730 }
kenjiArai 0:5b88d5760320 731
kenjiArai 0:5b88d5760320 732 /*
kenjiArai 0:5b88d5760320 733 * Validate peer's list (lengths)
kenjiArai 0:5b88d5760320 734 */
kenjiArai 0:5b88d5760320 735 start = buf + 2;
kenjiArai 0:5b88d5760320 736 end = buf + len;
kenjiArai 0:5b88d5760320 737 for( theirs = start; theirs != end; theirs += cur_len )
kenjiArai 0:5b88d5760320 738 {
kenjiArai 0:5b88d5760320 739 cur_len = *theirs++;
kenjiArai 0:5b88d5760320 740
kenjiArai 0:5b88d5760320 741 /* Current identifier must fit in list */
kenjiArai 0:5b88d5760320 742 if( cur_len > (size_t)( end - theirs ) )
kenjiArai 0:5b88d5760320 743 {
kenjiArai 0:5b88d5760320 744 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 745 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
kenjiArai 0:5b88d5760320 746 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 747 }
kenjiArai 0:5b88d5760320 748
kenjiArai 0:5b88d5760320 749 /* Empty strings MUST NOT be included */
kenjiArai 0:5b88d5760320 750 if( cur_len == 0 )
kenjiArai 0:5b88d5760320 751 {
kenjiArai 0:5b88d5760320 752 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 753 MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
kenjiArai 0:5b88d5760320 754 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 755 }
kenjiArai 0:5b88d5760320 756 }
kenjiArai 0:5b88d5760320 757
kenjiArai 0:5b88d5760320 758 /*
kenjiArai 0:5b88d5760320 759 * Use our order of preference
kenjiArai 0:5b88d5760320 760 */
kenjiArai 0:5b88d5760320 761 for( ours = ssl->conf->alpn_list; *ours != NULL; ours++ )
kenjiArai 0:5b88d5760320 762 {
kenjiArai 0:5b88d5760320 763 ours_len = strlen( *ours );
kenjiArai 0:5b88d5760320 764 for( theirs = start; theirs != end; theirs += cur_len )
kenjiArai 0:5b88d5760320 765 {
kenjiArai 0:5b88d5760320 766 cur_len = *theirs++;
kenjiArai 0:5b88d5760320 767
kenjiArai 0:5b88d5760320 768 if( cur_len == ours_len &&
kenjiArai 0:5b88d5760320 769 memcmp( theirs, *ours, cur_len ) == 0 )
kenjiArai 0:5b88d5760320 770 {
kenjiArai 0:5b88d5760320 771 ssl->alpn_chosen = *ours;
kenjiArai 0:5b88d5760320 772 return( 0 );
kenjiArai 0:5b88d5760320 773 }
kenjiArai 0:5b88d5760320 774 }
kenjiArai 0:5b88d5760320 775 }
kenjiArai 0:5b88d5760320 776
kenjiArai 0:5b88d5760320 777 /* If we get there, no match was found */
kenjiArai 0:5b88d5760320 778 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 779 MBEDTLS_SSL_ALERT_MSG_NO_APPLICATION_PROTOCOL );
kenjiArai 0:5b88d5760320 780 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 781 }
kenjiArai 0:5b88d5760320 782 #endif /* MBEDTLS_SSL_ALPN */
kenjiArai 0:5b88d5760320 783
kenjiArai 0:5b88d5760320 784 /*
kenjiArai 0:5b88d5760320 785 * Auxiliary functions for ServerHello parsing and related actions
kenjiArai 0:5b88d5760320 786 */
kenjiArai 0:5b88d5760320 787
kenjiArai 0:5b88d5760320 788 #if defined(MBEDTLS_X509_CRT_PARSE_C)
kenjiArai 0:5b88d5760320 789 /*
kenjiArai 0:5b88d5760320 790 * Return 0 if the given key uses one of the acceptable curves, -1 otherwise
kenjiArai 0:5b88d5760320 791 */
kenjiArai 0:5b88d5760320 792 #if defined(MBEDTLS_ECDSA_C)
kenjiArai 0:5b88d5760320 793 static int ssl_check_key_curve( mbedtls_pk_context *pk,
kenjiArai 0:5b88d5760320 794 const mbedtls_ecp_curve_info **curves )
kenjiArai 0:5b88d5760320 795 {
kenjiArai 0:5b88d5760320 796 const mbedtls_ecp_curve_info **crv = curves;
kenjiArai 0:5b88d5760320 797 mbedtls_ecp_group_id grp_id = mbedtls_pk_ec( *pk )->grp.id;
kenjiArai 0:5b88d5760320 798
kenjiArai 0:5b88d5760320 799 while( *crv != NULL )
kenjiArai 0:5b88d5760320 800 {
kenjiArai 0:5b88d5760320 801 if( (*crv)->grp_id == grp_id )
kenjiArai 0:5b88d5760320 802 return( 0 );
kenjiArai 0:5b88d5760320 803 crv++;
kenjiArai 0:5b88d5760320 804 }
kenjiArai 0:5b88d5760320 805
kenjiArai 0:5b88d5760320 806 return( -1 );
kenjiArai 0:5b88d5760320 807 }
kenjiArai 0:5b88d5760320 808 #endif /* MBEDTLS_ECDSA_C */
kenjiArai 0:5b88d5760320 809
kenjiArai 0:5b88d5760320 810 /*
kenjiArai 0:5b88d5760320 811 * Try picking a certificate for this ciphersuite,
kenjiArai 0:5b88d5760320 812 * return 0 on success and -1 on failure.
kenjiArai 0:5b88d5760320 813 */
kenjiArai 0:5b88d5760320 814 static int ssl_pick_cert( mbedtls_ssl_context *ssl,
kenjiArai 0:5b88d5760320 815 const mbedtls_ssl_ciphersuite_t * ciphersuite_info )
kenjiArai 0:5b88d5760320 816 {
kenjiArai 0:5b88d5760320 817 mbedtls_ssl_key_cert *cur, *list, *fallback = NULL;
kenjiArai 0:5b88d5760320 818 mbedtls_pk_type_t pk_alg =
kenjiArai 0:5b88d5760320 819 mbedtls_ssl_get_ciphersuite_sig_pk_alg( ciphersuite_info );
kenjiArai 0:5b88d5760320 820 uint32_t flags;
kenjiArai 0:5b88d5760320 821
kenjiArai 0:5b88d5760320 822 #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
kenjiArai 0:5b88d5760320 823 if( ssl->handshake->sni_key_cert != NULL )
kenjiArai 0:5b88d5760320 824 list = ssl->handshake->sni_key_cert;
kenjiArai 0:5b88d5760320 825 else
kenjiArai 0:5b88d5760320 826 #endif
kenjiArai 0:5b88d5760320 827 list = ssl->conf->key_cert;
kenjiArai 0:5b88d5760320 828
kenjiArai 0:5b88d5760320 829 if( pk_alg == MBEDTLS_PK_NONE )
kenjiArai 0:5b88d5760320 830 return( 0 );
kenjiArai 0:5b88d5760320 831
kenjiArai 0:5b88d5760320 832 MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite requires certificate" ) );
kenjiArai 0:5b88d5760320 833
kenjiArai 0:5b88d5760320 834 if( list == NULL )
kenjiArai 0:5b88d5760320 835 {
kenjiArai 0:5b88d5760320 836 MBEDTLS_SSL_DEBUG_MSG( 3, ( "server has no certificate" ) );
kenjiArai 0:5b88d5760320 837 return( -1 );
kenjiArai 0:5b88d5760320 838 }
kenjiArai 0:5b88d5760320 839
kenjiArai 0:5b88d5760320 840 for( cur = list; cur != NULL; cur = cur->next )
kenjiArai 0:5b88d5760320 841 {
kenjiArai 0:5b88d5760320 842 MBEDTLS_SSL_DEBUG_CRT( 3, "candidate certificate chain, certificate",
kenjiArai 0:5b88d5760320 843 cur->cert );
kenjiArai 0:5b88d5760320 844
kenjiArai 0:5b88d5760320 845 if( ! mbedtls_pk_can_do( &cur->cert->pk, pk_alg ) )
kenjiArai 0:5b88d5760320 846 {
kenjiArai 0:5b88d5760320 847 MBEDTLS_SSL_DEBUG_MSG( 3, ( "certificate mismatch: key type" ) );
kenjiArai 0:5b88d5760320 848 continue;
kenjiArai 0:5b88d5760320 849 }
kenjiArai 0:5b88d5760320 850
kenjiArai 0:5b88d5760320 851 /*
kenjiArai 0:5b88d5760320 852 * This avoids sending the client a cert it'll reject based on
kenjiArai 0:5b88d5760320 853 * keyUsage or other extensions.
kenjiArai 0:5b88d5760320 854 *
kenjiArai 0:5b88d5760320 855 * It also allows the user to provision different certificates for
kenjiArai 0:5b88d5760320 856 * different uses based on keyUsage, eg if they want to avoid signing
kenjiArai 0:5b88d5760320 857 * and decrypting with the same RSA key.
kenjiArai 0:5b88d5760320 858 */
kenjiArai 0:5b88d5760320 859 if( mbedtls_ssl_check_cert_usage( cur->cert, ciphersuite_info,
kenjiArai 0:5b88d5760320 860 MBEDTLS_SSL_IS_SERVER, &flags ) != 0 )
kenjiArai 0:5b88d5760320 861 {
kenjiArai 0:5b88d5760320 862 MBEDTLS_SSL_DEBUG_MSG( 3, ( "certificate mismatch: "
kenjiArai 0:5b88d5760320 863 "(extended) key usage extension" ) );
kenjiArai 0:5b88d5760320 864 continue;
kenjiArai 0:5b88d5760320 865 }
kenjiArai 0:5b88d5760320 866
kenjiArai 0:5b88d5760320 867 #if defined(MBEDTLS_ECDSA_C)
kenjiArai 0:5b88d5760320 868 if( pk_alg == MBEDTLS_PK_ECDSA &&
kenjiArai 0:5b88d5760320 869 ssl_check_key_curve( &cur->cert->pk, ssl->handshake->curves ) != 0 )
kenjiArai 0:5b88d5760320 870 {
kenjiArai 0:5b88d5760320 871 MBEDTLS_SSL_DEBUG_MSG( 3, ( "certificate mismatch: elliptic curve" ) );
kenjiArai 0:5b88d5760320 872 continue;
kenjiArai 0:5b88d5760320 873 }
kenjiArai 0:5b88d5760320 874 #endif
kenjiArai 0:5b88d5760320 875
kenjiArai 0:5b88d5760320 876 /*
kenjiArai 0:5b88d5760320 877 * Try to select a SHA-1 certificate for pre-1.2 clients, but still
kenjiArai 0:5b88d5760320 878 * present them a SHA-higher cert rather than failing if it's the only
kenjiArai 0:5b88d5760320 879 * one we got that satisfies the other conditions.
kenjiArai 0:5b88d5760320 880 */
kenjiArai 0:5b88d5760320 881 if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_3 &&
kenjiArai 0:5b88d5760320 882 cur->cert->sig_md != MBEDTLS_MD_SHA1 )
kenjiArai 0:5b88d5760320 883 {
kenjiArai 0:5b88d5760320 884 if( fallback == NULL )
kenjiArai 0:5b88d5760320 885 fallback = cur;
kenjiArai 0:5b88d5760320 886 {
kenjiArai 0:5b88d5760320 887 MBEDTLS_SSL_DEBUG_MSG( 3, ( "certificate not preferred: "
kenjiArai 0:5b88d5760320 888 "sha-2 with pre-TLS 1.2 client" ) );
kenjiArai 0:5b88d5760320 889 continue;
kenjiArai 0:5b88d5760320 890 }
kenjiArai 0:5b88d5760320 891 }
kenjiArai 0:5b88d5760320 892
kenjiArai 0:5b88d5760320 893 /* If we get there, we got a winner */
kenjiArai 0:5b88d5760320 894 break;
kenjiArai 0:5b88d5760320 895 }
kenjiArai 0:5b88d5760320 896
kenjiArai 0:5b88d5760320 897 if( cur == NULL )
kenjiArai 0:5b88d5760320 898 cur = fallback;
kenjiArai 0:5b88d5760320 899
kenjiArai 0:5b88d5760320 900 /* Do not update ssl->handshake->key_cert unless there is a match */
kenjiArai 0:5b88d5760320 901 if( cur != NULL )
kenjiArai 0:5b88d5760320 902 {
kenjiArai 0:5b88d5760320 903 ssl->handshake->key_cert = cur;
kenjiArai 0:5b88d5760320 904 MBEDTLS_SSL_DEBUG_CRT( 3, "selected certificate chain, certificate",
kenjiArai 0:5b88d5760320 905 ssl->handshake->key_cert->cert );
kenjiArai 0:5b88d5760320 906 return( 0 );
kenjiArai 0:5b88d5760320 907 }
kenjiArai 0:5b88d5760320 908
kenjiArai 0:5b88d5760320 909 return( -1 );
kenjiArai 0:5b88d5760320 910 }
kenjiArai 0:5b88d5760320 911 #endif /* MBEDTLS_X509_CRT_PARSE_C */
kenjiArai 0:5b88d5760320 912
kenjiArai 0:5b88d5760320 913 /*
kenjiArai 0:5b88d5760320 914 * Check if a given ciphersuite is suitable for use with our config/keys/etc
kenjiArai 0:5b88d5760320 915 * Sets ciphersuite_info only if the suite matches.
kenjiArai 0:5b88d5760320 916 */
kenjiArai 0:5b88d5760320 917 static int ssl_ciphersuite_match( mbedtls_ssl_context *ssl, int suite_id,
kenjiArai 0:5b88d5760320 918 const mbedtls_ssl_ciphersuite_t **ciphersuite_info )
kenjiArai 0:5b88d5760320 919 {
kenjiArai 0:5b88d5760320 920 const mbedtls_ssl_ciphersuite_t *suite_info;
kenjiArai 0:5b88d5760320 921
kenjiArai 0:5b88d5760320 922 #if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
kenjiArai 0:5b88d5760320 923 defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
kenjiArai 0:5b88d5760320 924 mbedtls_pk_type_t sig_type;
kenjiArai 0:5b88d5760320 925 #endif
kenjiArai 0:5b88d5760320 926
kenjiArai 0:5b88d5760320 927 suite_info = mbedtls_ssl_ciphersuite_from_id( suite_id );
kenjiArai 0:5b88d5760320 928 if( suite_info == NULL )
kenjiArai 0:5b88d5760320 929 {
kenjiArai 0:5b88d5760320 930 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
kenjiArai 0:5b88d5760320 931 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
kenjiArai 0:5b88d5760320 932 }
kenjiArai 0:5b88d5760320 933
kenjiArai 0:5b88d5760320 934 MBEDTLS_SSL_DEBUG_MSG( 3, ( "trying ciphersuite: %s", suite_info->name ) );
kenjiArai 0:5b88d5760320 935
kenjiArai 0:5b88d5760320 936 if( suite_info->min_minor_ver > ssl->minor_ver ||
kenjiArai 0:5b88d5760320 937 suite_info->max_minor_ver < ssl->minor_ver )
kenjiArai 0:5b88d5760320 938 {
kenjiArai 0:5b88d5760320 939 MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: version" ) );
kenjiArai 0:5b88d5760320 940 return( 0 );
kenjiArai 0:5b88d5760320 941 }
kenjiArai 0:5b88d5760320 942
kenjiArai 0:5b88d5760320 943 #if defined(MBEDTLS_SSL_PROTO_DTLS)
kenjiArai 0:5b88d5760320 944 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
kenjiArai 0:5b88d5760320 945 ( suite_info->flags & MBEDTLS_CIPHERSUITE_NODTLS ) )
kenjiArai 0:5b88d5760320 946 return( 0 );
kenjiArai 0:5b88d5760320 947 #endif
kenjiArai 0:5b88d5760320 948
kenjiArai 0:5b88d5760320 949 #if defined(MBEDTLS_ARC4_C)
kenjiArai 0:5b88d5760320 950 if( ssl->conf->arc4_disabled == MBEDTLS_SSL_ARC4_DISABLED &&
kenjiArai 0:5b88d5760320 951 suite_info->cipher == MBEDTLS_CIPHER_ARC4_128 )
kenjiArai 0:5b88d5760320 952 {
kenjiArai 0:5b88d5760320 953 MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: rc4" ) );
kenjiArai 0:5b88d5760320 954 return( 0 );
kenjiArai 0:5b88d5760320 955 }
kenjiArai 0:5b88d5760320 956 #endif
kenjiArai 0:5b88d5760320 957
kenjiArai 0:5b88d5760320 958 #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
kenjiArai 0:5b88d5760320 959 if( suite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE &&
kenjiArai 0:5b88d5760320 960 ( ssl->handshake->cli_exts & MBEDTLS_TLS_EXT_ECJPAKE_KKPP_OK ) == 0 )
kenjiArai 0:5b88d5760320 961 {
kenjiArai 0:5b88d5760320 962 MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: ecjpake "
kenjiArai 0:5b88d5760320 963 "not configured or ext missing" ) );
kenjiArai 0:5b88d5760320 964 return( 0 );
kenjiArai 0:5b88d5760320 965 }
kenjiArai 0:5b88d5760320 966 #endif
kenjiArai 0:5b88d5760320 967
kenjiArai 0:5b88d5760320 968
kenjiArai 0:5b88d5760320 969 #if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C)
kenjiArai 0:5b88d5760320 970 if( mbedtls_ssl_ciphersuite_uses_ec( suite_info ) &&
kenjiArai 0:5b88d5760320 971 ( ssl->handshake->curves == NULL ||
kenjiArai 0:5b88d5760320 972 ssl->handshake->curves[0] == NULL ) )
kenjiArai 0:5b88d5760320 973 {
kenjiArai 0:5b88d5760320 974 MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: "
kenjiArai 0:5b88d5760320 975 "no common elliptic curve" ) );
kenjiArai 0:5b88d5760320 976 return( 0 );
kenjiArai 0:5b88d5760320 977 }
kenjiArai 0:5b88d5760320 978 #endif
kenjiArai 0:5b88d5760320 979
kenjiArai 0:5b88d5760320 980 #if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
kenjiArai 0:5b88d5760320 981 /* If the ciphersuite requires a pre-shared key and we don't
kenjiArai 0:5b88d5760320 982 * have one, skip it now rather than failing later */
kenjiArai 0:5b88d5760320 983 if( mbedtls_ssl_ciphersuite_uses_psk( suite_info ) &&
kenjiArai 0:5b88d5760320 984 ssl_conf_has_psk_or_cb( ssl->conf ) == 0 )
kenjiArai 0:5b88d5760320 985 {
kenjiArai 0:5b88d5760320 986 MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: no pre-shared key" ) );
kenjiArai 0:5b88d5760320 987 return( 0 );
kenjiArai 0:5b88d5760320 988 }
kenjiArai 0:5b88d5760320 989 #endif
kenjiArai 0:5b88d5760320 990
kenjiArai 0:5b88d5760320 991 #if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
kenjiArai 0:5b88d5760320 992 defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
kenjiArai 0:5b88d5760320 993 /* If the ciphersuite requires signing, check whether
kenjiArai 0:5b88d5760320 994 * a suitable hash algorithm is present. */
kenjiArai 0:5b88d5760320 995 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
kenjiArai 0:5b88d5760320 996 {
kenjiArai 0:5b88d5760320 997 sig_type = mbedtls_ssl_get_ciphersuite_sig_alg( suite_info );
kenjiArai 0:5b88d5760320 998 if( sig_type != MBEDTLS_PK_NONE &&
kenjiArai 0:5b88d5760320 999 mbedtls_ssl_sig_hash_set_find( &ssl->handshake->hash_algs, sig_type ) == MBEDTLS_MD_NONE )
kenjiArai 0:5b88d5760320 1000 {
kenjiArai 0:5b88d5760320 1001 MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: no suitable hash algorithm "
kenjiArai 0:5b88d5760320 1002 "for signature algorithm %d", sig_type ) );
kenjiArai 0:5b88d5760320 1003 return( 0 );
kenjiArai 0:5b88d5760320 1004 }
kenjiArai 0:5b88d5760320 1005 }
kenjiArai 0:5b88d5760320 1006
kenjiArai 0:5b88d5760320 1007 #endif /* MBEDTLS_SSL_PROTO_TLS1_2 &&
kenjiArai 0:5b88d5760320 1008 MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */
kenjiArai 0:5b88d5760320 1009
kenjiArai 0:5b88d5760320 1010 #if defined(MBEDTLS_X509_CRT_PARSE_C)
kenjiArai 0:5b88d5760320 1011 /*
kenjiArai 0:5b88d5760320 1012 * Final check: if ciphersuite requires us to have a
kenjiArai 0:5b88d5760320 1013 * certificate/key of a particular type:
kenjiArai 0:5b88d5760320 1014 * - select the appropriate certificate if we have one, or
kenjiArai 0:5b88d5760320 1015 * - try the next ciphersuite if we don't
kenjiArai 0:5b88d5760320 1016 * This must be done last since we modify the key_cert list.
kenjiArai 0:5b88d5760320 1017 */
kenjiArai 0:5b88d5760320 1018 if( ssl_pick_cert( ssl, suite_info ) != 0 )
kenjiArai 0:5b88d5760320 1019 {
kenjiArai 0:5b88d5760320 1020 MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite mismatch: "
kenjiArai 0:5b88d5760320 1021 "no suitable certificate" ) );
kenjiArai 0:5b88d5760320 1022 return( 0 );
kenjiArai 0:5b88d5760320 1023 }
kenjiArai 0:5b88d5760320 1024 #endif
kenjiArai 0:5b88d5760320 1025
kenjiArai 0:5b88d5760320 1026 *ciphersuite_info = suite_info;
kenjiArai 0:5b88d5760320 1027 return( 0 );
kenjiArai 0:5b88d5760320 1028 }
kenjiArai 0:5b88d5760320 1029
kenjiArai 0:5b88d5760320 1030 #if defined(MBEDTLS_SSL_SRV_SUPPORT_SSLV2_CLIENT_HELLO)
kenjiArai 0:5b88d5760320 1031 static int ssl_parse_client_hello_v2( mbedtls_ssl_context *ssl )
kenjiArai 0:5b88d5760320 1032 {
kenjiArai 0:5b88d5760320 1033 int ret, got_common_suite;
kenjiArai 0:5b88d5760320 1034 unsigned int i, j;
kenjiArai 0:5b88d5760320 1035 size_t n;
kenjiArai 0:5b88d5760320 1036 unsigned int ciph_len, sess_len, chal_len;
kenjiArai 0:5b88d5760320 1037 unsigned char *buf, *p;
kenjiArai 0:5b88d5760320 1038 const int *ciphersuites;
kenjiArai 0:5b88d5760320 1039 const mbedtls_ssl_ciphersuite_t *ciphersuite_info;
kenjiArai 0:5b88d5760320 1040
kenjiArai 0:5b88d5760320 1041 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse client hello v2" ) );
kenjiArai 0:5b88d5760320 1042
kenjiArai 0:5b88d5760320 1043 #if defined(MBEDTLS_SSL_RENEGOTIATION)
kenjiArai 0:5b88d5760320 1044 if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE )
kenjiArai 0:5b88d5760320 1045 {
kenjiArai 0:5b88d5760320 1046 MBEDTLS_SSL_DEBUG_MSG( 1, ( "client hello v2 illegal for renegotiation" ) );
kenjiArai 0:5b88d5760320 1047 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 1048 MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
kenjiArai 0:5b88d5760320 1049 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 1050 }
kenjiArai 0:5b88d5760320 1051 #endif /* MBEDTLS_SSL_RENEGOTIATION */
kenjiArai 0:5b88d5760320 1052
kenjiArai 0:5b88d5760320 1053 buf = ssl->in_hdr;
kenjiArai 0:5b88d5760320 1054
kenjiArai 0:5b88d5760320 1055 MBEDTLS_SSL_DEBUG_BUF( 4, "record header", buf, 5 );
kenjiArai 0:5b88d5760320 1056
kenjiArai 0:5b88d5760320 1057 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v2, message type: %d",
kenjiArai 0:5b88d5760320 1058 buf[2] ) );
kenjiArai 0:5b88d5760320 1059 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v2, message len.: %d",
kenjiArai 0:5b88d5760320 1060 ( ( buf[0] & 0x7F ) << 8 ) | buf[1] ) );
kenjiArai 0:5b88d5760320 1061 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v2, max. version: [%d:%d]",
kenjiArai 0:5b88d5760320 1062 buf[3], buf[4] ) );
kenjiArai 0:5b88d5760320 1063
kenjiArai 0:5b88d5760320 1064 /*
kenjiArai 0:5b88d5760320 1065 * SSLv2 Client Hello
kenjiArai 0:5b88d5760320 1066 *
kenjiArai 0:5b88d5760320 1067 * Record layer:
kenjiArai 0:5b88d5760320 1068 * 0 . 1 message length
kenjiArai 0:5b88d5760320 1069 *
kenjiArai 0:5b88d5760320 1070 * SSL layer:
kenjiArai 0:5b88d5760320 1071 * 2 . 2 message type
kenjiArai 0:5b88d5760320 1072 * 3 . 4 protocol version
kenjiArai 0:5b88d5760320 1073 */
kenjiArai 0:5b88d5760320 1074 if( buf[2] != MBEDTLS_SSL_HS_CLIENT_HELLO ||
kenjiArai 0:5b88d5760320 1075 buf[3] != MBEDTLS_SSL_MAJOR_VERSION_3 )
kenjiArai 0:5b88d5760320 1076 {
kenjiArai 0:5b88d5760320 1077 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
kenjiArai 0:5b88d5760320 1078 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 1079 }
kenjiArai 0:5b88d5760320 1080
kenjiArai 0:5b88d5760320 1081 n = ( ( buf[0] << 8 ) | buf[1] ) & 0x7FFF;
kenjiArai 0:5b88d5760320 1082
kenjiArai 0:5b88d5760320 1083 if( n < 17 || n > 512 )
kenjiArai 0:5b88d5760320 1084 {
kenjiArai 0:5b88d5760320 1085 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
kenjiArai 0:5b88d5760320 1086 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 1087 }
kenjiArai 0:5b88d5760320 1088
kenjiArai 0:5b88d5760320 1089 ssl->major_ver = MBEDTLS_SSL_MAJOR_VERSION_3;
kenjiArai 0:5b88d5760320 1090 ssl->minor_ver = ( buf[4] <= ssl->conf->max_minor_ver )
kenjiArai 0:5b88d5760320 1091 ? buf[4] : ssl->conf->max_minor_ver;
kenjiArai 0:5b88d5760320 1092
kenjiArai 0:5b88d5760320 1093 if( ssl->minor_ver < ssl->conf->min_minor_ver )
kenjiArai 0:5b88d5760320 1094 {
kenjiArai 0:5b88d5760320 1095 MBEDTLS_SSL_DEBUG_MSG( 1, ( "client only supports ssl smaller than minimum"
kenjiArai 0:5b88d5760320 1096 " [%d:%d] < [%d:%d]",
kenjiArai 0:5b88d5760320 1097 ssl->major_ver, ssl->minor_ver,
kenjiArai 0:5b88d5760320 1098 ssl->conf->min_major_ver, ssl->conf->min_minor_ver ) );
kenjiArai 0:5b88d5760320 1099
kenjiArai 0:5b88d5760320 1100 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 1101 MBEDTLS_SSL_ALERT_MSG_PROTOCOL_VERSION );
kenjiArai 0:5b88d5760320 1102 return( MBEDTLS_ERR_SSL_BAD_HS_PROTOCOL_VERSION );
kenjiArai 0:5b88d5760320 1103 }
kenjiArai 0:5b88d5760320 1104
kenjiArai 0:5b88d5760320 1105 ssl->handshake->max_major_ver = buf[3];
kenjiArai 0:5b88d5760320 1106 ssl->handshake->max_minor_ver = buf[4];
kenjiArai 0:5b88d5760320 1107
kenjiArai 0:5b88d5760320 1108 if( ( ret = mbedtls_ssl_fetch_input( ssl, 2 + n ) ) != 0 )
kenjiArai 0:5b88d5760320 1109 {
kenjiArai 0:5b88d5760320 1110 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_fetch_input", ret );
kenjiArai 0:5b88d5760320 1111 return( ret );
kenjiArai 0:5b88d5760320 1112 }
kenjiArai 0:5b88d5760320 1113
kenjiArai 0:5b88d5760320 1114 ssl->handshake->update_checksum( ssl, buf + 2, n );
kenjiArai 0:5b88d5760320 1115
kenjiArai 0:5b88d5760320 1116 buf = ssl->in_msg;
kenjiArai 0:5b88d5760320 1117 n = ssl->in_left - 5;
kenjiArai 0:5b88d5760320 1118
kenjiArai 0:5b88d5760320 1119 /*
kenjiArai 0:5b88d5760320 1120 * 0 . 1 ciphersuitelist length
kenjiArai 0:5b88d5760320 1121 * 2 . 3 session id length
kenjiArai 0:5b88d5760320 1122 * 4 . 5 challenge length
kenjiArai 0:5b88d5760320 1123 * 6 . .. ciphersuitelist
kenjiArai 0:5b88d5760320 1124 * .. . .. session id
kenjiArai 0:5b88d5760320 1125 * .. . .. challenge
kenjiArai 0:5b88d5760320 1126 */
kenjiArai 0:5b88d5760320 1127 MBEDTLS_SSL_DEBUG_BUF( 4, "record contents", buf, n );
kenjiArai 0:5b88d5760320 1128
kenjiArai 0:5b88d5760320 1129 ciph_len = ( buf[0] << 8 ) | buf[1];
kenjiArai 0:5b88d5760320 1130 sess_len = ( buf[2] << 8 ) | buf[3];
kenjiArai 0:5b88d5760320 1131 chal_len = ( buf[4] << 8 ) | buf[5];
kenjiArai 0:5b88d5760320 1132
kenjiArai 0:5b88d5760320 1133 MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciph_len: %d, sess_len: %d, chal_len: %d",
kenjiArai 0:5b88d5760320 1134 ciph_len, sess_len, chal_len ) );
kenjiArai 0:5b88d5760320 1135
kenjiArai 0:5b88d5760320 1136 /*
kenjiArai 0:5b88d5760320 1137 * Make sure each parameter length is valid
kenjiArai 0:5b88d5760320 1138 */
kenjiArai 0:5b88d5760320 1139 if( ciph_len < 3 || ( ciph_len % 3 ) != 0 )
kenjiArai 0:5b88d5760320 1140 {
kenjiArai 0:5b88d5760320 1141 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
kenjiArai 0:5b88d5760320 1142 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 1143 }
kenjiArai 0:5b88d5760320 1144
kenjiArai 0:5b88d5760320 1145 if( sess_len > 32 )
kenjiArai 0:5b88d5760320 1146 {
kenjiArai 0:5b88d5760320 1147 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
kenjiArai 0:5b88d5760320 1148 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 1149 }
kenjiArai 0:5b88d5760320 1150
kenjiArai 0:5b88d5760320 1151 if( chal_len < 8 || chal_len > 32 )
kenjiArai 0:5b88d5760320 1152 {
kenjiArai 0:5b88d5760320 1153 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
kenjiArai 0:5b88d5760320 1154 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 1155 }
kenjiArai 0:5b88d5760320 1156
kenjiArai 0:5b88d5760320 1157 if( n != 6 + ciph_len + sess_len + chal_len )
kenjiArai 0:5b88d5760320 1158 {
kenjiArai 0:5b88d5760320 1159 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
kenjiArai 0:5b88d5760320 1160 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 1161 }
kenjiArai 0:5b88d5760320 1162
kenjiArai 0:5b88d5760320 1163 MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, ciphersuitelist",
kenjiArai 0:5b88d5760320 1164 buf + 6, ciph_len );
kenjiArai 0:5b88d5760320 1165 MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, session id",
kenjiArai 0:5b88d5760320 1166 buf + 6 + ciph_len, sess_len );
kenjiArai 0:5b88d5760320 1167 MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, challenge",
kenjiArai 0:5b88d5760320 1168 buf + 6 + ciph_len + sess_len, chal_len );
kenjiArai 0:5b88d5760320 1169
kenjiArai 0:5b88d5760320 1170 p = buf + 6 + ciph_len;
kenjiArai 0:5b88d5760320 1171 ssl->session_negotiate->id_len = sess_len;
kenjiArai 0:5b88d5760320 1172 memset( ssl->session_negotiate->id, 0,
kenjiArai 0:5b88d5760320 1173 sizeof( ssl->session_negotiate->id ) );
kenjiArai 0:5b88d5760320 1174 memcpy( ssl->session_negotiate->id, p, ssl->session_negotiate->id_len );
kenjiArai 0:5b88d5760320 1175
kenjiArai 0:5b88d5760320 1176 p += sess_len;
kenjiArai 0:5b88d5760320 1177 memset( ssl->handshake->randbytes, 0, 64 );
kenjiArai 0:5b88d5760320 1178 memcpy( ssl->handshake->randbytes + 32 - chal_len, p, chal_len );
kenjiArai 0:5b88d5760320 1179
kenjiArai 0:5b88d5760320 1180 /*
kenjiArai 0:5b88d5760320 1181 * Check for TLS_EMPTY_RENEGOTIATION_INFO_SCSV
kenjiArai 0:5b88d5760320 1182 */
kenjiArai 0:5b88d5760320 1183 for( i = 0, p = buf + 6; i < ciph_len; i += 3, p += 3 )
kenjiArai 0:5b88d5760320 1184 {
kenjiArai 0:5b88d5760320 1185 if( p[0] == 0 && p[1] == 0 && p[2] == MBEDTLS_SSL_EMPTY_RENEGOTIATION_INFO )
kenjiArai 0:5b88d5760320 1186 {
kenjiArai 0:5b88d5760320 1187 MBEDTLS_SSL_DEBUG_MSG( 3, ( "received TLS_EMPTY_RENEGOTIATION_INFO " ) );
kenjiArai 0:5b88d5760320 1188 #if defined(MBEDTLS_SSL_RENEGOTIATION)
kenjiArai 0:5b88d5760320 1189 if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
kenjiArai 0:5b88d5760320 1190 {
kenjiArai 0:5b88d5760320 1191 MBEDTLS_SSL_DEBUG_MSG( 1, ( "received RENEGOTIATION SCSV "
kenjiArai 0:5b88d5760320 1192 "during renegotiation" ) );
kenjiArai 0:5b88d5760320 1193
kenjiArai 0:5b88d5760320 1194 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 1195 MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
kenjiArai 0:5b88d5760320 1196 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 1197 }
kenjiArai 0:5b88d5760320 1198 #endif /* MBEDTLS_SSL_RENEGOTIATION */
kenjiArai 0:5b88d5760320 1199 ssl->secure_renegotiation = MBEDTLS_SSL_SECURE_RENEGOTIATION;
kenjiArai 0:5b88d5760320 1200 break;
kenjiArai 0:5b88d5760320 1201 }
kenjiArai 0:5b88d5760320 1202 }
kenjiArai 0:5b88d5760320 1203
kenjiArai 0:5b88d5760320 1204 #if defined(MBEDTLS_SSL_FALLBACK_SCSV)
kenjiArai 0:5b88d5760320 1205 for( i = 0, p = buf + 6; i < ciph_len; i += 3, p += 3 )
kenjiArai 0:5b88d5760320 1206 {
kenjiArai 0:5b88d5760320 1207 if( p[0] == 0 &&
kenjiArai 0:5b88d5760320 1208 p[1] == (unsigned char)( ( MBEDTLS_SSL_FALLBACK_SCSV_VALUE >> 8 ) & 0xff ) &&
kenjiArai 0:5b88d5760320 1209 p[2] == (unsigned char)( ( MBEDTLS_SSL_FALLBACK_SCSV_VALUE ) & 0xff ) )
kenjiArai 0:5b88d5760320 1210 {
kenjiArai 0:5b88d5760320 1211 MBEDTLS_SSL_DEBUG_MSG( 3, ( "received FALLBACK_SCSV" ) );
kenjiArai 0:5b88d5760320 1212
kenjiArai 0:5b88d5760320 1213 if( ssl->minor_ver < ssl->conf->max_minor_ver )
kenjiArai 0:5b88d5760320 1214 {
kenjiArai 0:5b88d5760320 1215 MBEDTLS_SSL_DEBUG_MSG( 1, ( "inapropriate fallback" ) );
kenjiArai 0:5b88d5760320 1216
kenjiArai 0:5b88d5760320 1217 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 1218 MBEDTLS_SSL_ALERT_MSG_INAPROPRIATE_FALLBACK );
kenjiArai 0:5b88d5760320 1219
kenjiArai 0:5b88d5760320 1220 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 1221 }
kenjiArai 0:5b88d5760320 1222
kenjiArai 0:5b88d5760320 1223 break;
kenjiArai 0:5b88d5760320 1224 }
kenjiArai 0:5b88d5760320 1225 }
kenjiArai 0:5b88d5760320 1226 #endif /* MBEDTLS_SSL_FALLBACK_SCSV */
kenjiArai 0:5b88d5760320 1227
kenjiArai 0:5b88d5760320 1228 got_common_suite = 0;
kenjiArai 0:5b88d5760320 1229 ciphersuites = ssl->conf->ciphersuite_list[ssl->minor_ver];
kenjiArai 0:5b88d5760320 1230 ciphersuite_info = NULL;
kenjiArai 0:5b88d5760320 1231 #if defined(MBEDTLS_SSL_SRV_RESPECT_CLIENT_PREFERENCE)
kenjiArai 0:5b88d5760320 1232 for( j = 0, p = buf + 6; j < ciph_len; j += 3, p += 3 )
kenjiArai 0:5b88d5760320 1233 for( i = 0; ciphersuites[i] != 0; i++ )
kenjiArai 0:5b88d5760320 1234 #else
kenjiArai 0:5b88d5760320 1235 for( i = 0; ciphersuites[i] != 0; i++ )
kenjiArai 0:5b88d5760320 1236 for( j = 0, p = buf + 6; j < ciph_len; j += 3, p += 3 )
kenjiArai 0:5b88d5760320 1237 #endif
kenjiArai 0:5b88d5760320 1238 {
kenjiArai 0:5b88d5760320 1239 if( p[0] != 0 ||
kenjiArai 0:5b88d5760320 1240 p[1] != ( ( ciphersuites[i] >> 8 ) & 0xFF ) ||
kenjiArai 0:5b88d5760320 1241 p[2] != ( ( ciphersuites[i] ) & 0xFF ) )
kenjiArai 0:5b88d5760320 1242 continue;
kenjiArai 0:5b88d5760320 1243
kenjiArai 0:5b88d5760320 1244 got_common_suite = 1;
kenjiArai 0:5b88d5760320 1245
kenjiArai 0:5b88d5760320 1246 if( ( ret = ssl_ciphersuite_match( ssl, ciphersuites[i],
kenjiArai 0:5b88d5760320 1247 &ciphersuite_info ) ) != 0 )
kenjiArai 0:5b88d5760320 1248 return( ret );
kenjiArai 0:5b88d5760320 1249
kenjiArai 0:5b88d5760320 1250 if( ciphersuite_info != NULL )
kenjiArai 0:5b88d5760320 1251 goto have_ciphersuite_v2;
kenjiArai 0:5b88d5760320 1252 }
kenjiArai 0:5b88d5760320 1253
kenjiArai 0:5b88d5760320 1254 if( got_common_suite )
kenjiArai 0:5b88d5760320 1255 {
kenjiArai 0:5b88d5760320 1256 MBEDTLS_SSL_DEBUG_MSG( 1, ( "got ciphersuites in common, "
kenjiArai 0:5b88d5760320 1257 "but none of them usable" ) );
kenjiArai 0:5b88d5760320 1258 return( MBEDTLS_ERR_SSL_NO_USABLE_CIPHERSUITE );
kenjiArai 0:5b88d5760320 1259 }
kenjiArai 0:5b88d5760320 1260 else
kenjiArai 0:5b88d5760320 1261 {
kenjiArai 0:5b88d5760320 1262 MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no ciphersuites in common" ) );
kenjiArai 0:5b88d5760320 1263 return( MBEDTLS_ERR_SSL_NO_CIPHER_CHOSEN );
kenjiArai 0:5b88d5760320 1264 }
kenjiArai 0:5b88d5760320 1265
kenjiArai 0:5b88d5760320 1266 have_ciphersuite_v2:
kenjiArai 0:5b88d5760320 1267 MBEDTLS_SSL_DEBUG_MSG( 2, ( "selected ciphersuite: %s", ciphersuite_info->name ) );
kenjiArai 0:5b88d5760320 1268
kenjiArai 0:5b88d5760320 1269 ssl->session_negotiate->ciphersuite = ciphersuites[i];
kenjiArai 0:5b88d5760320 1270 ssl->handshake->ciphersuite_info = ciphersuite_info;
kenjiArai 0:5b88d5760320 1271
kenjiArai 0:5b88d5760320 1272 /*
kenjiArai 0:5b88d5760320 1273 * SSLv2 Client Hello relevant renegotiation security checks
kenjiArai 0:5b88d5760320 1274 */
kenjiArai 0:5b88d5760320 1275 if( ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION &&
kenjiArai 0:5b88d5760320 1276 ssl->conf->allow_legacy_renegotiation == MBEDTLS_SSL_LEGACY_BREAK_HANDSHAKE )
kenjiArai 0:5b88d5760320 1277 {
kenjiArai 0:5b88d5760320 1278 MBEDTLS_SSL_DEBUG_MSG( 1, ( "legacy renegotiation, breaking off handshake" ) );
kenjiArai 0:5b88d5760320 1279 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 1280 MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
kenjiArai 0:5b88d5760320 1281 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 1282 }
kenjiArai 0:5b88d5760320 1283
kenjiArai 0:5b88d5760320 1284 ssl->in_left = 0;
kenjiArai 0:5b88d5760320 1285 ssl->state++;
kenjiArai 0:5b88d5760320 1286
kenjiArai 0:5b88d5760320 1287 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse client hello v2" ) );
kenjiArai 0:5b88d5760320 1288
kenjiArai 0:5b88d5760320 1289 return( 0 );
kenjiArai 0:5b88d5760320 1290 }
kenjiArai 0:5b88d5760320 1291 #endif /* MBEDTLS_SSL_SRV_SUPPORT_SSLV2_CLIENT_HELLO */
kenjiArai 0:5b88d5760320 1292
kenjiArai 0:5b88d5760320 1293 /* This function doesn't alert on errors that happen early during
kenjiArai 0:5b88d5760320 1294 ClientHello parsing because they might indicate that the client is
kenjiArai 0:5b88d5760320 1295 not talking SSL/TLS at all and would not understand our alert. */
kenjiArai 0:5b88d5760320 1296 static int ssl_parse_client_hello( mbedtls_ssl_context *ssl )
kenjiArai 0:5b88d5760320 1297 {
kenjiArai 0:5b88d5760320 1298 int ret, got_common_suite;
kenjiArai 0:5b88d5760320 1299 size_t i, j;
kenjiArai 0:5b88d5760320 1300 size_t ciph_offset, comp_offset, ext_offset;
kenjiArai 0:5b88d5760320 1301 size_t msg_len, ciph_len, sess_len, comp_len, ext_len;
kenjiArai 0:5b88d5760320 1302 #if defined(MBEDTLS_SSL_PROTO_DTLS)
kenjiArai 0:5b88d5760320 1303 size_t cookie_offset, cookie_len;
kenjiArai 0:5b88d5760320 1304 #endif
kenjiArai 0:5b88d5760320 1305 unsigned char *buf, *p, *ext;
kenjiArai 0:5b88d5760320 1306 #if defined(MBEDTLS_SSL_RENEGOTIATION)
kenjiArai 0:5b88d5760320 1307 int renegotiation_info_seen = 0;
kenjiArai 0:5b88d5760320 1308 #endif
kenjiArai 0:5b88d5760320 1309 int handshake_failure = 0;
kenjiArai 0:5b88d5760320 1310 const int *ciphersuites;
kenjiArai 0:5b88d5760320 1311 const mbedtls_ssl_ciphersuite_t *ciphersuite_info;
kenjiArai 0:5b88d5760320 1312 int major, minor;
kenjiArai 0:5b88d5760320 1313
kenjiArai 0:5b88d5760320 1314 /* If there is no signature-algorithm extension present,
kenjiArai 0:5b88d5760320 1315 * we need to fall back to the default values for allowed
kenjiArai 0:5b88d5760320 1316 * signature-hash pairs. */
kenjiArai 0:5b88d5760320 1317 #if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
kenjiArai 0:5b88d5760320 1318 defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
kenjiArai 0:5b88d5760320 1319 int sig_hash_alg_ext_present = 0;
kenjiArai 0:5b88d5760320 1320 #endif /* MBEDTLS_SSL_PROTO_TLS1_2 &&
kenjiArai 0:5b88d5760320 1321 MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */
kenjiArai 0:5b88d5760320 1322
kenjiArai 0:5b88d5760320 1323 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse client hello" ) );
kenjiArai 0:5b88d5760320 1324
kenjiArai 0:5b88d5760320 1325 #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
kenjiArai 0:5b88d5760320 1326 read_record_header:
kenjiArai 0:5b88d5760320 1327 #endif
kenjiArai 0:5b88d5760320 1328 /*
kenjiArai 0:5b88d5760320 1329 * If renegotiating, then the input was read with mbedtls_ssl_read_record(),
kenjiArai 0:5b88d5760320 1330 * otherwise read it ourselves manually in order to support SSLv2
kenjiArai 0:5b88d5760320 1331 * ClientHello, which doesn't use the same record layer format.
kenjiArai 0:5b88d5760320 1332 */
kenjiArai 0:5b88d5760320 1333 #if defined(MBEDTLS_SSL_RENEGOTIATION)
kenjiArai 0:5b88d5760320 1334 if( ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE )
kenjiArai 0:5b88d5760320 1335 #endif
kenjiArai 0:5b88d5760320 1336 {
kenjiArai 0:5b88d5760320 1337 if( ( ret = mbedtls_ssl_fetch_input( ssl, 5 ) ) != 0 )
kenjiArai 0:5b88d5760320 1338 {
kenjiArai 0:5b88d5760320 1339 /* No alert on a read error. */
kenjiArai 0:5b88d5760320 1340 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_fetch_input", ret );
kenjiArai 0:5b88d5760320 1341 return( ret );
kenjiArai 0:5b88d5760320 1342 }
kenjiArai 0:5b88d5760320 1343 }
kenjiArai 0:5b88d5760320 1344
kenjiArai 0:5b88d5760320 1345 buf = ssl->in_hdr;
kenjiArai 0:5b88d5760320 1346
kenjiArai 0:5b88d5760320 1347 #if defined(MBEDTLS_SSL_SRV_SUPPORT_SSLV2_CLIENT_HELLO)
kenjiArai 0:5b88d5760320 1348 #if defined(MBEDTLS_SSL_PROTO_DTLS)
kenjiArai 0:5b88d5760320 1349 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_STREAM )
kenjiArai 0:5b88d5760320 1350 #endif
kenjiArai 0:5b88d5760320 1351 if( ( buf[0] & 0x80 ) != 0 )
kenjiArai 0:5b88d5760320 1352 return( ssl_parse_client_hello_v2( ssl ) );
kenjiArai 0:5b88d5760320 1353 #endif
kenjiArai 0:5b88d5760320 1354
kenjiArai 0:5b88d5760320 1355 MBEDTLS_SSL_DEBUG_BUF( 4, "record header", buf, mbedtls_ssl_in_hdr_len( ssl ) );
kenjiArai 0:5b88d5760320 1356
kenjiArai 0:5b88d5760320 1357 /*
kenjiArai 0:5b88d5760320 1358 * SSLv3/TLS Client Hello
kenjiArai 0:5b88d5760320 1359 *
kenjiArai 0:5b88d5760320 1360 * Record layer:
kenjiArai 0:5b88d5760320 1361 * 0 . 0 message type
kenjiArai 0:5b88d5760320 1362 * 1 . 2 protocol version
kenjiArai 0:5b88d5760320 1363 * 3 . 11 DTLS: epoch + record sequence number
kenjiArai 0:5b88d5760320 1364 * 3 . 4 message length
kenjiArai 0:5b88d5760320 1365 */
kenjiArai 0:5b88d5760320 1366 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, message type: %d",
kenjiArai 0:5b88d5760320 1367 buf[0] ) );
kenjiArai 0:5b88d5760320 1368
kenjiArai 0:5b88d5760320 1369 if( buf[0] != MBEDTLS_SSL_MSG_HANDSHAKE )
kenjiArai 0:5b88d5760320 1370 {
kenjiArai 0:5b88d5760320 1371 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
kenjiArai 0:5b88d5760320 1372 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 1373 }
kenjiArai 0:5b88d5760320 1374
kenjiArai 0:5b88d5760320 1375 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, message len.: %d",
kenjiArai 0:5b88d5760320 1376 ( ssl->in_len[0] << 8 ) | ssl->in_len[1] ) );
kenjiArai 0:5b88d5760320 1377
kenjiArai 0:5b88d5760320 1378 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, protocol version: [%d:%d]",
kenjiArai 0:5b88d5760320 1379 buf[1], buf[2] ) );
kenjiArai 0:5b88d5760320 1380
kenjiArai 0:5b88d5760320 1381 mbedtls_ssl_read_version( &major, &minor, ssl->conf->transport, buf + 1 );
kenjiArai 0:5b88d5760320 1382
kenjiArai 0:5b88d5760320 1383 /* According to RFC 5246 Appendix E.1, the version here is typically
kenjiArai 0:5b88d5760320 1384 * "{03,00}, the lowest version number supported by the client, [or] the
kenjiArai 0:5b88d5760320 1385 * value of ClientHello.client_version", so the only meaningful check here
kenjiArai 0:5b88d5760320 1386 * is the major version shouldn't be less than 3 */
kenjiArai 0:5b88d5760320 1387 if( major < MBEDTLS_SSL_MAJOR_VERSION_3 )
kenjiArai 0:5b88d5760320 1388 {
kenjiArai 0:5b88d5760320 1389 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
kenjiArai 0:5b88d5760320 1390 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 1391 }
kenjiArai 0:5b88d5760320 1392
kenjiArai 0:5b88d5760320 1393 /* For DTLS if this is the initial handshake, remember the client sequence
kenjiArai 0:5b88d5760320 1394 * number to use it in our next message (RFC 6347 4.2.1) */
kenjiArai 0:5b88d5760320 1395 #if defined(MBEDTLS_SSL_PROTO_DTLS)
kenjiArai 0:5b88d5760320 1396 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM
kenjiArai 0:5b88d5760320 1397 #if defined(MBEDTLS_SSL_RENEGOTIATION)
kenjiArai 0:5b88d5760320 1398 && ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE
kenjiArai 0:5b88d5760320 1399 #endif
kenjiArai 0:5b88d5760320 1400 )
kenjiArai 0:5b88d5760320 1401 {
kenjiArai 0:5b88d5760320 1402 /* Epoch should be 0 for initial handshakes */
kenjiArai 0:5b88d5760320 1403 if( ssl->in_ctr[0] != 0 || ssl->in_ctr[1] != 0 )
kenjiArai 0:5b88d5760320 1404 {
kenjiArai 0:5b88d5760320 1405 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
kenjiArai 0:5b88d5760320 1406 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 1407 }
kenjiArai 0:5b88d5760320 1408
kenjiArai 0:5b88d5760320 1409 memcpy( ssl->cur_out_ctr + 2, ssl->in_ctr + 2, 6 );
kenjiArai 0:5b88d5760320 1410
kenjiArai 0:5b88d5760320 1411 #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
kenjiArai 0:5b88d5760320 1412 if( mbedtls_ssl_dtls_replay_check( ssl ) != 0 )
kenjiArai 0:5b88d5760320 1413 {
kenjiArai 0:5b88d5760320 1414 MBEDTLS_SSL_DEBUG_MSG( 1, ( "replayed record, discarding" ) );
kenjiArai 0:5b88d5760320 1415 ssl->next_record_offset = 0;
kenjiArai 0:5b88d5760320 1416 ssl->in_left = 0;
kenjiArai 0:5b88d5760320 1417 goto read_record_header;
kenjiArai 0:5b88d5760320 1418 }
kenjiArai 0:5b88d5760320 1419
kenjiArai 0:5b88d5760320 1420 /* No MAC to check yet, so we can update right now */
kenjiArai 0:5b88d5760320 1421 mbedtls_ssl_dtls_replay_update( ssl );
kenjiArai 0:5b88d5760320 1422 #endif
kenjiArai 0:5b88d5760320 1423 }
kenjiArai 0:5b88d5760320 1424 #endif /* MBEDTLS_SSL_PROTO_DTLS */
kenjiArai 0:5b88d5760320 1425
kenjiArai 0:5b88d5760320 1426 msg_len = ( ssl->in_len[0] << 8 ) | ssl->in_len[1];
kenjiArai 0:5b88d5760320 1427
kenjiArai 0:5b88d5760320 1428 #if defined(MBEDTLS_SSL_RENEGOTIATION)
kenjiArai 0:5b88d5760320 1429 if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE )
kenjiArai 0:5b88d5760320 1430 {
kenjiArai 0:5b88d5760320 1431 /* Set by mbedtls_ssl_read_record() */
kenjiArai 0:5b88d5760320 1432 msg_len = ssl->in_hslen;
kenjiArai 0:5b88d5760320 1433 }
kenjiArai 0:5b88d5760320 1434 else
kenjiArai 0:5b88d5760320 1435 #endif
kenjiArai 0:5b88d5760320 1436 {
kenjiArai 0:5b88d5760320 1437 if( msg_len > MBEDTLS_SSL_IN_CONTENT_LEN )
kenjiArai 0:5b88d5760320 1438 {
kenjiArai 0:5b88d5760320 1439 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
kenjiArai 0:5b88d5760320 1440 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 1441 }
kenjiArai 0:5b88d5760320 1442
kenjiArai 0:5b88d5760320 1443 if( ( ret = mbedtls_ssl_fetch_input( ssl,
kenjiArai 0:5b88d5760320 1444 mbedtls_ssl_in_hdr_len( ssl ) + msg_len ) ) != 0 )
kenjiArai 0:5b88d5760320 1445 {
kenjiArai 0:5b88d5760320 1446 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_fetch_input", ret );
kenjiArai 0:5b88d5760320 1447 return( ret );
kenjiArai 0:5b88d5760320 1448 }
kenjiArai 0:5b88d5760320 1449
kenjiArai 0:5b88d5760320 1450 /* Done reading this record, get ready for the next one */
kenjiArai 0:5b88d5760320 1451 #if defined(MBEDTLS_SSL_PROTO_DTLS)
kenjiArai 0:5b88d5760320 1452 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
kenjiArai 0:5b88d5760320 1453 ssl->next_record_offset = msg_len + mbedtls_ssl_in_hdr_len( ssl );
kenjiArai 0:5b88d5760320 1454 else
kenjiArai 0:5b88d5760320 1455 #endif
kenjiArai 0:5b88d5760320 1456 ssl->in_left = 0;
kenjiArai 0:5b88d5760320 1457 }
kenjiArai 0:5b88d5760320 1458
kenjiArai 0:5b88d5760320 1459 buf = ssl->in_msg;
kenjiArai 0:5b88d5760320 1460
kenjiArai 0:5b88d5760320 1461 MBEDTLS_SSL_DEBUG_BUF( 4, "record contents", buf, msg_len );
kenjiArai 0:5b88d5760320 1462
kenjiArai 0:5b88d5760320 1463 ssl->handshake->update_checksum( ssl, buf, msg_len );
kenjiArai 0:5b88d5760320 1464
kenjiArai 0:5b88d5760320 1465 /*
kenjiArai 0:5b88d5760320 1466 * Handshake layer:
kenjiArai 0:5b88d5760320 1467 * 0 . 0 handshake type
kenjiArai 0:5b88d5760320 1468 * 1 . 3 handshake length
kenjiArai 0:5b88d5760320 1469 * 4 . 5 DTLS only: message seqence number
kenjiArai 0:5b88d5760320 1470 * 6 . 8 DTLS only: fragment offset
kenjiArai 0:5b88d5760320 1471 * 9 . 11 DTLS only: fragment length
kenjiArai 0:5b88d5760320 1472 */
kenjiArai 0:5b88d5760320 1473 if( msg_len < mbedtls_ssl_hs_hdr_len( ssl ) )
kenjiArai 0:5b88d5760320 1474 {
kenjiArai 0:5b88d5760320 1475 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
kenjiArai 0:5b88d5760320 1476 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 1477 }
kenjiArai 0:5b88d5760320 1478
kenjiArai 0:5b88d5760320 1479 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, handshake type: %d", buf[0] ) );
kenjiArai 0:5b88d5760320 1480
kenjiArai 0:5b88d5760320 1481 if( buf[0] != MBEDTLS_SSL_HS_CLIENT_HELLO )
kenjiArai 0:5b88d5760320 1482 {
kenjiArai 0:5b88d5760320 1483 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
kenjiArai 0:5b88d5760320 1484 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 1485 }
kenjiArai 0:5b88d5760320 1486
kenjiArai 0:5b88d5760320 1487 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, handshake len.: %d",
kenjiArai 0:5b88d5760320 1488 ( buf[1] << 16 ) | ( buf[2] << 8 ) | buf[3] ) );
kenjiArai 0:5b88d5760320 1489
kenjiArai 0:5b88d5760320 1490 /* We don't support fragmentation of ClientHello (yet?) */
kenjiArai 0:5b88d5760320 1491 if( buf[1] != 0 ||
kenjiArai 0:5b88d5760320 1492 msg_len != mbedtls_ssl_hs_hdr_len( ssl ) + ( ( buf[2] << 8 ) | buf[3] ) )
kenjiArai 0:5b88d5760320 1493 {
kenjiArai 0:5b88d5760320 1494 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
kenjiArai 0:5b88d5760320 1495 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 1496 }
kenjiArai 0:5b88d5760320 1497
kenjiArai 0:5b88d5760320 1498 #if defined(MBEDTLS_SSL_PROTO_DTLS)
kenjiArai 0:5b88d5760320 1499 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
kenjiArai 0:5b88d5760320 1500 {
kenjiArai 0:5b88d5760320 1501 /*
kenjiArai 0:5b88d5760320 1502 * Copy the client's handshake message_seq on initial handshakes,
kenjiArai 0:5b88d5760320 1503 * check sequence number on renego.
kenjiArai 0:5b88d5760320 1504 */
kenjiArai 0:5b88d5760320 1505 #if defined(MBEDTLS_SSL_RENEGOTIATION)
kenjiArai 0:5b88d5760320 1506 if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
kenjiArai 0:5b88d5760320 1507 {
kenjiArai 0:5b88d5760320 1508 /* This couldn't be done in ssl_prepare_handshake_record() */
kenjiArai 0:5b88d5760320 1509 unsigned int cli_msg_seq = ( ssl->in_msg[4] << 8 ) |
kenjiArai 0:5b88d5760320 1510 ssl->in_msg[5];
kenjiArai 0:5b88d5760320 1511
kenjiArai 0:5b88d5760320 1512 if( cli_msg_seq != ssl->handshake->in_msg_seq )
kenjiArai 0:5b88d5760320 1513 {
kenjiArai 0:5b88d5760320 1514 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message_seq: "
kenjiArai 0:5b88d5760320 1515 "%d (expected %d)", cli_msg_seq,
kenjiArai 0:5b88d5760320 1516 ssl->handshake->in_msg_seq ) );
kenjiArai 0:5b88d5760320 1517 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 1518 }
kenjiArai 0:5b88d5760320 1519
kenjiArai 0:5b88d5760320 1520 ssl->handshake->in_msg_seq++;
kenjiArai 0:5b88d5760320 1521 }
kenjiArai 0:5b88d5760320 1522 else
kenjiArai 0:5b88d5760320 1523 #endif
kenjiArai 0:5b88d5760320 1524 {
kenjiArai 0:5b88d5760320 1525 unsigned int cli_msg_seq = ( ssl->in_msg[4] << 8 ) |
kenjiArai 0:5b88d5760320 1526 ssl->in_msg[5];
kenjiArai 0:5b88d5760320 1527 ssl->handshake->out_msg_seq = cli_msg_seq;
kenjiArai 0:5b88d5760320 1528 ssl->handshake->in_msg_seq = cli_msg_seq + 1;
kenjiArai 0:5b88d5760320 1529 }
kenjiArai 0:5b88d5760320 1530
kenjiArai 0:5b88d5760320 1531 /*
kenjiArai 0:5b88d5760320 1532 * For now we don't support fragmentation, so make sure
kenjiArai 0:5b88d5760320 1533 * fragment_offset == 0 and fragment_length == length
kenjiArai 0:5b88d5760320 1534 */
kenjiArai 0:5b88d5760320 1535 if( ssl->in_msg[6] != 0 || ssl->in_msg[7] != 0 || ssl->in_msg[8] != 0 ||
kenjiArai 0:5b88d5760320 1536 memcmp( ssl->in_msg + 1, ssl->in_msg + 9, 3 ) != 0 )
kenjiArai 0:5b88d5760320 1537 {
kenjiArai 0:5b88d5760320 1538 MBEDTLS_SSL_DEBUG_MSG( 1, ( "ClientHello fragmentation not supported" ) );
kenjiArai 0:5b88d5760320 1539 return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
kenjiArai 0:5b88d5760320 1540 }
kenjiArai 0:5b88d5760320 1541 }
kenjiArai 0:5b88d5760320 1542 #endif /* MBEDTLS_SSL_PROTO_DTLS */
kenjiArai 0:5b88d5760320 1543
kenjiArai 0:5b88d5760320 1544 buf += mbedtls_ssl_hs_hdr_len( ssl );
kenjiArai 0:5b88d5760320 1545 msg_len -= mbedtls_ssl_hs_hdr_len( ssl );
kenjiArai 0:5b88d5760320 1546
kenjiArai 0:5b88d5760320 1547 /*
kenjiArai 0:5b88d5760320 1548 * ClientHello layer:
kenjiArai 0:5b88d5760320 1549 * 0 . 1 protocol version
kenjiArai 0:5b88d5760320 1550 * 2 . 33 random bytes (starting with 4 bytes of Unix time)
kenjiArai 0:5b88d5760320 1551 * 34 . 35 session id length (1 byte)
kenjiArai 0:5b88d5760320 1552 * 35 . 34+x session id
kenjiArai 0:5b88d5760320 1553 * 35+x . 35+x DTLS only: cookie length (1 byte)
kenjiArai 0:5b88d5760320 1554 * 36+x . .. DTLS only: cookie
kenjiArai 0:5b88d5760320 1555 * .. . .. ciphersuite list length (2 bytes)
kenjiArai 0:5b88d5760320 1556 * .. . .. ciphersuite list
kenjiArai 0:5b88d5760320 1557 * .. . .. compression alg. list length (1 byte)
kenjiArai 0:5b88d5760320 1558 * .. . .. compression alg. list
kenjiArai 0:5b88d5760320 1559 * .. . .. extensions length (2 bytes, optional)
kenjiArai 0:5b88d5760320 1560 * .. . .. extensions (optional)
kenjiArai 0:5b88d5760320 1561 */
kenjiArai 0:5b88d5760320 1562
kenjiArai 0:5b88d5760320 1563 /*
kenjiArai 0:5b88d5760320 1564 * Minimal length (with everything empty and extensions omitted) is
kenjiArai 0:5b88d5760320 1565 * 2 + 32 + 1 + 2 + 1 = 38 bytes. Check that first, so that we can
kenjiArai 0:5b88d5760320 1566 * read at least up to session id length without worrying.
kenjiArai 0:5b88d5760320 1567 */
kenjiArai 0:5b88d5760320 1568 if( msg_len < 38 )
kenjiArai 0:5b88d5760320 1569 {
kenjiArai 0:5b88d5760320 1570 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
kenjiArai 0:5b88d5760320 1571 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 1572 }
kenjiArai 0:5b88d5760320 1573
kenjiArai 0:5b88d5760320 1574 /*
kenjiArai 0:5b88d5760320 1575 * Check and save the protocol version
kenjiArai 0:5b88d5760320 1576 */
kenjiArai 0:5b88d5760320 1577 MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, version", buf, 2 );
kenjiArai 0:5b88d5760320 1578
kenjiArai 0:5b88d5760320 1579 mbedtls_ssl_read_version( &ssl->major_ver, &ssl->minor_ver,
kenjiArai 0:5b88d5760320 1580 ssl->conf->transport, buf );
kenjiArai 0:5b88d5760320 1581
kenjiArai 0:5b88d5760320 1582 ssl->handshake->max_major_ver = ssl->major_ver;
kenjiArai 0:5b88d5760320 1583 ssl->handshake->max_minor_ver = ssl->minor_ver;
kenjiArai 0:5b88d5760320 1584
kenjiArai 0:5b88d5760320 1585 if( ssl->major_ver < ssl->conf->min_major_ver ||
kenjiArai 0:5b88d5760320 1586 ssl->minor_ver < ssl->conf->min_minor_ver )
kenjiArai 0:5b88d5760320 1587 {
kenjiArai 0:5b88d5760320 1588 MBEDTLS_SSL_DEBUG_MSG( 1, ( "client only supports ssl smaller than minimum"
kenjiArai 0:5b88d5760320 1589 " [%d:%d] < [%d:%d]",
kenjiArai 0:5b88d5760320 1590 ssl->major_ver, ssl->minor_ver,
kenjiArai 0:5b88d5760320 1591 ssl->conf->min_major_ver, ssl->conf->min_minor_ver ) );
kenjiArai 0:5b88d5760320 1592 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 1593 MBEDTLS_SSL_ALERT_MSG_PROTOCOL_VERSION );
kenjiArai 0:5b88d5760320 1594 return( MBEDTLS_ERR_SSL_BAD_HS_PROTOCOL_VERSION );
kenjiArai 0:5b88d5760320 1595 }
kenjiArai 0:5b88d5760320 1596
kenjiArai 0:5b88d5760320 1597 if( ssl->major_ver > ssl->conf->max_major_ver )
kenjiArai 0:5b88d5760320 1598 {
kenjiArai 0:5b88d5760320 1599 ssl->major_ver = ssl->conf->max_major_ver;
kenjiArai 0:5b88d5760320 1600 ssl->minor_ver = ssl->conf->max_minor_ver;
kenjiArai 0:5b88d5760320 1601 }
kenjiArai 0:5b88d5760320 1602 else if( ssl->minor_ver > ssl->conf->max_minor_ver )
kenjiArai 0:5b88d5760320 1603 ssl->minor_ver = ssl->conf->max_minor_ver;
kenjiArai 0:5b88d5760320 1604
kenjiArai 0:5b88d5760320 1605 /*
kenjiArai 0:5b88d5760320 1606 * Save client random (inc. Unix time)
kenjiArai 0:5b88d5760320 1607 */
kenjiArai 0:5b88d5760320 1608 MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, random bytes", buf + 2, 32 );
kenjiArai 0:5b88d5760320 1609
kenjiArai 0:5b88d5760320 1610 memcpy( ssl->handshake->randbytes, buf + 2, 32 );
kenjiArai 0:5b88d5760320 1611
kenjiArai 0:5b88d5760320 1612 /*
kenjiArai 0:5b88d5760320 1613 * Check the session ID length and save session ID
kenjiArai 0:5b88d5760320 1614 */
kenjiArai 0:5b88d5760320 1615 sess_len = buf[34];
kenjiArai 0:5b88d5760320 1616
kenjiArai 0:5b88d5760320 1617 if( sess_len > sizeof( ssl->session_negotiate->id ) ||
kenjiArai 0:5b88d5760320 1618 sess_len + 34 + 2 > msg_len ) /* 2 for cipherlist length field */
kenjiArai 0:5b88d5760320 1619 {
kenjiArai 0:5b88d5760320 1620 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
kenjiArai 0:5b88d5760320 1621 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 1622 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
kenjiArai 0:5b88d5760320 1623 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 1624 }
kenjiArai 0:5b88d5760320 1625
kenjiArai 0:5b88d5760320 1626 MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, session id", buf + 35, sess_len );
kenjiArai 0:5b88d5760320 1627
kenjiArai 0:5b88d5760320 1628 ssl->session_negotiate->id_len = sess_len;
kenjiArai 0:5b88d5760320 1629 memset( ssl->session_negotiate->id, 0,
kenjiArai 0:5b88d5760320 1630 sizeof( ssl->session_negotiate->id ) );
kenjiArai 0:5b88d5760320 1631 memcpy( ssl->session_negotiate->id, buf + 35,
kenjiArai 0:5b88d5760320 1632 ssl->session_negotiate->id_len );
kenjiArai 0:5b88d5760320 1633
kenjiArai 0:5b88d5760320 1634 /*
kenjiArai 0:5b88d5760320 1635 * Check the cookie length and content
kenjiArai 0:5b88d5760320 1636 */
kenjiArai 0:5b88d5760320 1637 #if defined(MBEDTLS_SSL_PROTO_DTLS)
kenjiArai 0:5b88d5760320 1638 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
kenjiArai 0:5b88d5760320 1639 {
kenjiArai 0:5b88d5760320 1640 cookie_offset = 35 + sess_len;
kenjiArai 0:5b88d5760320 1641 cookie_len = buf[cookie_offset];
kenjiArai 0:5b88d5760320 1642
kenjiArai 0:5b88d5760320 1643 if( cookie_offset + 1 + cookie_len + 2 > msg_len )
kenjiArai 0:5b88d5760320 1644 {
kenjiArai 0:5b88d5760320 1645 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
kenjiArai 0:5b88d5760320 1646 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 1647 MBEDTLS_SSL_ALERT_MSG_PROTOCOL_VERSION );
kenjiArai 0:5b88d5760320 1648 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 1649 }
kenjiArai 0:5b88d5760320 1650
kenjiArai 0:5b88d5760320 1651 MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, cookie",
kenjiArai 0:5b88d5760320 1652 buf + cookie_offset + 1, cookie_len );
kenjiArai 0:5b88d5760320 1653
kenjiArai 0:5b88d5760320 1654 #if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY)
kenjiArai 0:5b88d5760320 1655 if( ssl->conf->f_cookie_check != NULL
kenjiArai 0:5b88d5760320 1656 #if defined(MBEDTLS_SSL_RENEGOTIATION)
kenjiArai 0:5b88d5760320 1657 && ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE
kenjiArai 0:5b88d5760320 1658 #endif
kenjiArai 0:5b88d5760320 1659 )
kenjiArai 0:5b88d5760320 1660 {
kenjiArai 0:5b88d5760320 1661 if( ssl->conf->f_cookie_check( ssl->conf->p_cookie,
kenjiArai 0:5b88d5760320 1662 buf + cookie_offset + 1, cookie_len,
kenjiArai 0:5b88d5760320 1663 ssl->cli_id, ssl->cli_id_len ) != 0 )
kenjiArai 0:5b88d5760320 1664 {
kenjiArai 0:5b88d5760320 1665 MBEDTLS_SSL_DEBUG_MSG( 2, ( "cookie verification failed" ) );
kenjiArai 0:5b88d5760320 1666 ssl->handshake->verify_cookie_len = 1;
kenjiArai 0:5b88d5760320 1667 }
kenjiArai 0:5b88d5760320 1668 else
kenjiArai 0:5b88d5760320 1669 {
kenjiArai 0:5b88d5760320 1670 MBEDTLS_SSL_DEBUG_MSG( 2, ( "cookie verification passed" ) );
kenjiArai 0:5b88d5760320 1671 ssl->handshake->verify_cookie_len = 0;
kenjiArai 0:5b88d5760320 1672 }
kenjiArai 0:5b88d5760320 1673 }
kenjiArai 0:5b88d5760320 1674 else
kenjiArai 0:5b88d5760320 1675 #endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY */
kenjiArai 0:5b88d5760320 1676 {
kenjiArai 0:5b88d5760320 1677 /* We know we didn't send a cookie, so it should be empty */
kenjiArai 0:5b88d5760320 1678 if( cookie_len != 0 )
kenjiArai 0:5b88d5760320 1679 {
kenjiArai 0:5b88d5760320 1680 /* This may be an attacker's probe, so don't send an alert */
kenjiArai 0:5b88d5760320 1681 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
kenjiArai 0:5b88d5760320 1682 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 1683 }
kenjiArai 0:5b88d5760320 1684
kenjiArai 0:5b88d5760320 1685 MBEDTLS_SSL_DEBUG_MSG( 2, ( "cookie verification skipped" ) );
kenjiArai 0:5b88d5760320 1686 }
kenjiArai 0:5b88d5760320 1687
kenjiArai 0:5b88d5760320 1688 /*
kenjiArai 0:5b88d5760320 1689 * Check the ciphersuitelist length (will be parsed later)
kenjiArai 0:5b88d5760320 1690 */
kenjiArai 0:5b88d5760320 1691 ciph_offset = cookie_offset + 1 + cookie_len;
kenjiArai 0:5b88d5760320 1692 }
kenjiArai 0:5b88d5760320 1693 else
kenjiArai 0:5b88d5760320 1694 #endif /* MBEDTLS_SSL_PROTO_DTLS */
kenjiArai 0:5b88d5760320 1695 ciph_offset = 35 + sess_len;
kenjiArai 0:5b88d5760320 1696
kenjiArai 0:5b88d5760320 1697 ciph_len = ( buf[ciph_offset + 0] << 8 )
kenjiArai 0:5b88d5760320 1698 | ( buf[ciph_offset + 1] );
kenjiArai 0:5b88d5760320 1699
kenjiArai 0:5b88d5760320 1700 if( ciph_len < 2 ||
kenjiArai 0:5b88d5760320 1701 ciph_len + 2 + ciph_offset + 1 > msg_len || /* 1 for comp. alg. len */
kenjiArai 0:5b88d5760320 1702 ( ciph_len % 2 ) != 0 )
kenjiArai 0:5b88d5760320 1703 {
kenjiArai 0:5b88d5760320 1704 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
kenjiArai 0:5b88d5760320 1705 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 1706 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
kenjiArai 0:5b88d5760320 1707 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 1708 }
kenjiArai 0:5b88d5760320 1709
kenjiArai 0:5b88d5760320 1710 MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, ciphersuitelist",
kenjiArai 0:5b88d5760320 1711 buf + ciph_offset + 2, ciph_len );
kenjiArai 0:5b88d5760320 1712
kenjiArai 0:5b88d5760320 1713 /*
kenjiArai 0:5b88d5760320 1714 * Check the compression algorithms length and pick one
kenjiArai 0:5b88d5760320 1715 */
kenjiArai 0:5b88d5760320 1716 comp_offset = ciph_offset + 2 + ciph_len;
kenjiArai 0:5b88d5760320 1717
kenjiArai 0:5b88d5760320 1718 comp_len = buf[comp_offset];
kenjiArai 0:5b88d5760320 1719
kenjiArai 0:5b88d5760320 1720 if( comp_len < 1 ||
kenjiArai 0:5b88d5760320 1721 comp_len > 16 ||
kenjiArai 0:5b88d5760320 1722 comp_len + comp_offset + 1 > msg_len )
kenjiArai 0:5b88d5760320 1723 {
kenjiArai 0:5b88d5760320 1724 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
kenjiArai 0:5b88d5760320 1725 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 1726 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
kenjiArai 0:5b88d5760320 1727 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 1728 }
kenjiArai 0:5b88d5760320 1729
kenjiArai 0:5b88d5760320 1730 MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, compression",
kenjiArai 0:5b88d5760320 1731 buf + comp_offset + 1, comp_len );
kenjiArai 0:5b88d5760320 1732
kenjiArai 0:5b88d5760320 1733 ssl->session_negotiate->compression = MBEDTLS_SSL_COMPRESS_NULL;
kenjiArai 0:5b88d5760320 1734 #if defined(MBEDTLS_ZLIB_SUPPORT)
kenjiArai 0:5b88d5760320 1735 for( i = 0; i < comp_len; ++i )
kenjiArai 0:5b88d5760320 1736 {
kenjiArai 0:5b88d5760320 1737 if( buf[comp_offset + 1 + i] == MBEDTLS_SSL_COMPRESS_DEFLATE )
kenjiArai 0:5b88d5760320 1738 {
kenjiArai 0:5b88d5760320 1739 ssl->session_negotiate->compression = MBEDTLS_SSL_COMPRESS_DEFLATE;
kenjiArai 0:5b88d5760320 1740 break;
kenjiArai 0:5b88d5760320 1741 }
kenjiArai 0:5b88d5760320 1742 }
kenjiArai 0:5b88d5760320 1743 #endif
kenjiArai 0:5b88d5760320 1744
kenjiArai 0:5b88d5760320 1745 /* See comments in ssl_write_client_hello() */
kenjiArai 0:5b88d5760320 1746 #if defined(MBEDTLS_SSL_PROTO_DTLS)
kenjiArai 0:5b88d5760320 1747 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
kenjiArai 0:5b88d5760320 1748 ssl->session_negotiate->compression = MBEDTLS_SSL_COMPRESS_NULL;
kenjiArai 0:5b88d5760320 1749 #endif
kenjiArai 0:5b88d5760320 1750
kenjiArai 0:5b88d5760320 1751 /* Do not parse the extensions if the protocol is SSLv3 */
kenjiArai 0:5b88d5760320 1752 #if defined(MBEDTLS_SSL_PROTO_SSL3)
kenjiArai 0:5b88d5760320 1753 if( ( ssl->major_ver != 3 ) || ( ssl->minor_ver != 0 ) )
kenjiArai 0:5b88d5760320 1754 {
kenjiArai 0:5b88d5760320 1755 #endif
kenjiArai 0:5b88d5760320 1756 /*
kenjiArai 0:5b88d5760320 1757 * Check the extension length
kenjiArai 0:5b88d5760320 1758 */
kenjiArai 0:5b88d5760320 1759 ext_offset = comp_offset + 1 + comp_len;
kenjiArai 0:5b88d5760320 1760 if( msg_len > ext_offset )
kenjiArai 0:5b88d5760320 1761 {
kenjiArai 0:5b88d5760320 1762 if( msg_len < ext_offset + 2 )
kenjiArai 0:5b88d5760320 1763 {
kenjiArai 0:5b88d5760320 1764 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
kenjiArai 0:5b88d5760320 1765 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 1766 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
kenjiArai 0:5b88d5760320 1767 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 1768 }
kenjiArai 0:5b88d5760320 1769
kenjiArai 0:5b88d5760320 1770 ext_len = ( buf[ext_offset + 0] << 8 )
kenjiArai 0:5b88d5760320 1771 | ( buf[ext_offset + 1] );
kenjiArai 0:5b88d5760320 1772
kenjiArai 0:5b88d5760320 1773 if( ( ext_len > 0 && ext_len < 4 ) ||
kenjiArai 0:5b88d5760320 1774 msg_len != ext_offset + 2 + ext_len )
kenjiArai 0:5b88d5760320 1775 {
kenjiArai 0:5b88d5760320 1776 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
kenjiArai 0:5b88d5760320 1777 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 1778 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
kenjiArai 0:5b88d5760320 1779 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 1780 }
kenjiArai 0:5b88d5760320 1781 }
kenjiArai 0:5b88d5760320 1782 else
kenjiArai 0:5b88d5760320 1783 ext_len = 0;
kenjiArai 0:5b88d5760320 1784
kenjiArai 0:5b88d5760320 1785 ext = buf + ext_offset + 2;
kenjiArai 0:5b88d5760320 1786 MBEDTLS_SSL_DEBUG_BUF( 3, "client hello extensions", ext, ext_len );
kenjiArai 0:5b88d5760320 1787
kenjiArai 0:5b88d5760320 1788 while( ext_len != 0 )
kenjiArai 0:5b88d5760320 1789 {
kenjiArai 0:5b88d5760320 1790 unsigned int ext_id;
kenjiArai 0:5b88d5760320 1791 unsigned int ext_size;
kenjiArai 0:5b88d5760320 1792 if ( ext_len < 4 ) {
kenjiArai 0:5b88d5760320 1793 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
kenjiArai 0:5b88d5760320 1794 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 1795 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
kenjiArai 0:5b88d5760320 1796 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 1797 }
kenjiArai 0:5b88d5760320 1798 ext_id = ( ( ext[0] << 8 ) | ( ext[1] ) );
kenjiArai 0:5b88d5760320 1799 ext_size = ( ( ext[2] << 8 ) | ( ext[3] ) );
kenjiArai 0:5b88d5760320 1800
kenjiArai 0:5b88d5760320 1801 if( ext_size + 4 > ext_len )
kenjiArai 0:5b88d5760320 1802 {
kenjiArai 0:5b88d5760320 1803 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
kenjiArai 0:5b88d5760320 1804 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 1805 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
kenjiArai 0:5b88d5760320 1806 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 1807 }
kenjiArai 0:5b88d5760320 1808 switch( ext_id )
kenjiArai 0:5b88d5760320 1809 {
kenjiArai 0:5b88d5760320 1810 #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
kenjiArai 0:5b88d5760320 1811 case MBEDTLS_TLS_EXT_SERVERNAME:
kenjiArai 0:5b88d5760320 1812 MBEDTLS_SSL_DEBUG_MSG( 3, ( "found ServerName extension" ) );
kenjiArai 0:5b88d5760320 1813 if( ssl->conf->f_sni == NULL )
kenjiArai 0:5b88d5760320 1814 break;
kenjiArai 0:5b88d5760320 1815
kenjiArai 0:5b88d5760320 1816 ret = ssl_parse_servername_ext( ssl, ext + 4, ext_size );
kenjiArai 0:5b88d5760320 1817 if( ret != 0 )
kenjiArai 0:5b88d5760320 1818 return( ret );
kenjiArai 0:5b88d5760320 1819 break;
kenjiArai 0:5b88d5760320 1820 #endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
kenjiArai 0:5b88d5760320 1821
kenjiArai 0:5b88d5760320 1822 case MBEDTLS_TLS_EXT_RENEGOTIATION_INFO:
kenjiArai 0:5b88d5760320 1823 MBEDTLS_SSL_DEBUG_MSG( 3, ( "found renegotiation extension" ) );
kenjiArai 0:5b88d5760320 1824 #if defined(MBEDTLS_SSL_RENEGOTIATION)
kenjiArai 0:5b88d5760320 1825 renegotiation_info_seen = 1;
kenjiArai 0:5b88d5760320 1826 #endif
kenjiArai 0:5b88d5760320 1827
kenjiArai 0:5b88d5760320 1828 ret = ssl_parse_renegotiation_info( ssl, ext + 4, ext_size );
kenjiArai 0:5b88d5760320 1829 if( ret != 0 )
kenjiArai 0:5b88d5760320 1830 return( ret );
kenjiArai 0:5b88d5760320 1831 break;
kenjiArai 0:5b88d5760320 1832
kenjiArai 0:5b88d5760320 1833 #if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
kenjiArai 0:5b88d5760320 1834 defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
kenjiArai 0:5b88d5760320 1835 case MBEDTLS_TLS_EXT_SIG_ALG:
kenjiArai 0:5b88d5760320 1836 MBEDTLS_SSL_DEBUG_MSG( 3, ( "found signature_algorithms extension" ) );
kenjiArai 0:5b88d5760320 1837
kenjiArai 0:5b88d5760320 1838 ret = ssl_parse_signature_algorithms_ext( ssl, ext + 4, ext_size );
kenjiArai 0:5b88d5760320 1839 if( ret != 0 )
kenjiArai 0:5b88d5760320 1840 return( ret );
kenjiArai 0:5b88d5760320 1841
kenjiArai 0:5b88d5760320 1842 sig_hash_alg_ext_present = 1;
kenjiArai 0:5b88d5760320 1843 break;
kenjiArai 0:5b88d5760320 1844 #endif /* MBEDTLS_SSL_PROTO_TLS1_2 &&
kenjiArai 0:5b88d5760320 1845 MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */
kenjiArai 0:5b88d5760320 1846
kenjiArai 0:5b88d5760320 1847 #if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \
kenjiArai 0:5b88d5760320 1848 defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
kenjiArai 0:5b88d5760320 1849 case MBEDTLS_TLS_EXT_SUPPORTED_ELLIPTIC_CURVES:
kenjiArai 0:5b88d5760320 1850 MBEDTLS_SSL_DEBUG_MSG( 3, ( "found supported elliptic curves extension" ) );
kenjiArai 0:5b88d5760320 1851
kenjiArai 0:5b88d5760320 1852 ret = ssl_parse_supported_elliptic_curves( ssl, ext + 4, ext_size );
kenjiArai 0:5b88d5760320 1853 if( ret != 0 )
kenjiArai 0:5b88d5760320 1854 return( ret );
kenjiArai 0:5b88d5760320 1855 break;
kenjiArai 0:5b88d5760320 1856
kenjiArai 0:5b88d5760320 1857 case MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS:
kenjiArai 0:5b88d5760320 1858 MBEDTLS_SSL_DEBUG_MSG( 3, ( "found supported point formats extension" ) );
kenjiArai 0:5b88d5760320 1859 ssl->handshake->cli_exts |= MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS_PRESENT;
kenjiArai 0:5b88d5760320 1860
kenjiArai 0:5b88d5760320 1861 ret = ssl_parse_supported_point_formats( ssl, ext + 4, ext_size );
kenjiArai 0:5b88d5760320 1862 if( ret != 0 )
kenjiArai 0:5b88d5760320 1863 return( ret );
kenjiArai 0:5b88d5760320 1864 break;
kenjiArai 0:5b88d5760320 1865 #endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C ||
kenjiArai 0:5b88d5760320 1866 MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
kenjiArai 0:5b88d5760320 1867
kenjiArai 0:5b88d5760320 1868 #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
kenjiArai 0:5b88d5760320 1869 case MBEDTLS_TLS_EXT_ECJPAKE_KKPP:
kenjiArai 0:5b88d5760320 1870 MBEDTLS_SSL_DEBUG_MSG( 3, ( "found ecjpake kkpp extension" ) );
kenjiArai 0:5b88d5760320 1871
kenjiArai 0:5b88d5760320 1872 ret = ssl_parse_ecjpake_kkpp( ssl, ext + 4, ext_size );
kenjiArai 0:5b88d5760320 1873 if( ret != 0 )
kenjiArai 0:5b88d5760320 1874 return( ret );
kenjiArai 0:5b88d5760320 1875 break;
kenjiArai 0:5b88d5760320 1876 #endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
kenjiArai 0:5b88d5760320 1877
kenjiArai 0:5b88d5760320 1878 #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
kenjiArai 0:5b88d5760320 1879 case MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH:
kenjiArai 0:5b88d5760320 1880 MBEDTLS_SSL_DEBUG_MSG( 3, ( "found max fragment length extension" ) );
kenjiArai 0:5b88d5760320 1881
kenjiArai 0:5b88d5760320 1882 ret = ssl_parse_max_fragment_length_ext( ssl, ext + 4, ext_size );
kenjiArai 0:5b88d5760320 1883 if( ret != 0 )
kenjiArai 0:5b88d5760320 1884 return( ret );
kenjiArai 0:5b88d5760320 1885 break;
kenjiArai 0:5b88d5760320 1886 #endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
kenjiArai 0:5b88d5760320 1887
kenjiArai 0:5b88d5760320 1888 #if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
kenjiArai 0:5b88d5760320 1889 case MBEDTLS_TLS_EXT_TRUNCATED_HMAC:
kenjiArai 0:5b88d5760320 1890 MBEDTLS_SSL_DEBUG_MSG( 3, ( "found truncated hmac extension" ) );
kenjiArai 0:5b88d5760320 1891
kenjiArai 0:5b88d5760320 1892 ret = ssl_parse_truncated_hmac_ext( ssl, ext + 4, ext_size );
kenjiArai 0:5b88d5760320 1893 if( ret != 0 )
kenjiArai 0:5b88d5760320 1894 return( ret );
kenjiArai 0:5b88d5760320 1895 break;
kenjiArai 0:5b88d5760320 1896 #endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
kenjiArai 0:5b88d5760320 1897
kenjiArai 0:5b88d5760320 1898 #if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
kenjiArai 0:5b88d5760320 1899 case MBEDTLS_TLS_EXT_CID:
kenjiArai 0:5b88d5760320 1900 MBEDTLS_SSL_DEBUG_MSG( 3, ( "found CID extension" ) );
kenjiArai 0:5b88d5760320 1901
kenjiArai 0:5b88d5760320 1902 ret = ssl_parse_cid_ext( ssl, ext + 4, ext_size );
kenjiArai 0:5b88d5760320 1903 if( ret != 0 )
kenjiArai 0:5b88d5760320 1904 return( ret );
kenjiArai 0:5b88d5760320 1905 break;
kenjiArai 0:5b88d5760320 1906 #endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
kenjiArai 0:5b88d5760320 1907
kenjiArai 0:5b88d5760320 1908 #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
kenjiArai 0:5b88d5760320 1909 case MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC:
kenjiArai 0:5b88d5760320 1910 MBEDTLS_SSL_DEBUG_MSG( 3, ( "found encrypt then mac extension" ) );
kenjiArai 0:5b88d5760320 1911
kenjiArai 0:5b88d5760320 1912 ret = ssl_parse_encrypt_then_mac_ext( ssl, ext + 4, ext_size );
kenjiArai 0:5b88d5760320 1913 if( ret != 0 )
kenjiArai 0:5b88d5760320 1914 return( ret );
kenjiArai 0:5b88d5760320 1915 break;
kenjiArai 0:5b88d5760320 1916 #endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
kenjiArai 0:5b88d5760320 1917
kenjiArai 0:5b88d5760320 1918 #if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
kenjiArai 0:5b88d5760320 1919 case MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET:
kenjiArai 0:5b88d5760320 1920 MBEDTLS_SSL_DEBUG_MSG( 3, ( "found extended master secret extension" ) );
kenjiArai 0:5b88d5760320 1921
kenjiArai 0:5b88d5760320 1922 ret = ssl_parse_extended_ms_ext( ssl, ext + 4, ext_size );
kenjiArai 0:5b88d5760320 1923 if( ret != 0 )
kenjiArai 0:5b88d5760320 1924 return( ret );
kenjiArai 0:5b88d5760320 1925 break;
kenjiArai 0:5b88d5760320 1926 #endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */
kenjiArai 0:5b88d5760320 1927
kenjiArai 0:5b88d5760320 1928 #if defined(MBEDTLS_SSL_SESSION_TICKETS)
kenjiArai 0:5b88d5760320 1929 case MBEDTLS_TLS_EXT_SESSION_TICKET:
kenjiArai 0:5b88d5760320 1930 MBEDTLS_SSL_DEBUG_MSG( 3, ( "found session ticket extension" ) );
kenjiArai 0:5b88d5760320 1931
kenjiArai 0:5b88d5760320 1932 ret = ssl_parse_session_ticket_ext( ssl, ext + 4, ext_size );
kenjiArai 0:5b88d5760320 1933 if( ret != 0 )
kenjiArai 0:5b88d5760320 1934 return( ret );
kenjiArai 0:5b88d5760320 1935 break;
kenjiArai 0:5b88d5760320 1936 #endif /* MBEDTLS_SSL_SESSION_TICKETS */
kenjiArai 0:5b88d5760320 1937
kenjiArai 0:5b88d5760320 1938 #if defined(MBEDTLS_SSL_ALPN)
kenjiArai 0:5b88d5760320 1939 case MBEDTLS_TLS_EXT_ALPN:
kenjiArai 0:5b88d5760320 1940 MBEDTLS_SSL_DEBUG_MSG( 3, ( "found alpn extension" ) );
kenjiArai 0:5b88d5760320 1941
kenjiArai 0:5b88d5760320 1942 ret = ssl_parse_alpn_ext( ssl, ext + 4, ext_size );
kenjiArai 0:5b88d5760320 1943 if( ret != 0 )
kenjiArai 0:5b88d5760320 1944 return( ret );
kenjiArai 0:5b88d5760320 1945 break;
kenjiArai 0:5b88d5760320 1946 #endif /* MBEDTLS_SSL_SESSION_TICKETS */
kenjiArai 0:5b88d5760320 1947
kenjiArai 0:5b88d5760320 1948 default:
kenjiArai 0:5b88d5760320 1949 MBEDTLS_SSL_DEBUG_MSG( 3, ( "unknown extension found: %d (ignoring)",
kenjiArai 0:5b88d5760320 1950 ext_id ) );
kenjiArai 0:5b88d5760320 1951 }
kenjiArai 0:5b88d5760320 1952
kenjiArai 0:5b88d5760320 1953 ext_len -= 4 + ext_size;
kenjiArai 0:5b88d5760320 1954 ext += 4 + ext_size;
kenjiArai 0:5b88d5760320 1955
kenjiArai 0:5b88d5760320 1956 if( ext_len > 0 && ext_len < 4 )
kenjiArai 0:5b88d5760320 1957 {
kenjiArai 0:5b88d5760320 1958 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client hello message" ) );
kenjiArai 0:5b88d5760320 1959 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 1960 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
kenjiArai 0:5b88d5760320 1961 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 1962 }
kenjiArai 0:5b88d5760320 1963 }
kenjiArai 0:5b88d5760320 1964 #if defined(MBEDTLS_SSL_PROTO_SSL3)
kenjiArai 0:5b88d5760320 1965 }
kenjiArai 0:5b88d5760320 1966 #endif
kenjiArai 0:5b88d5760320 1967
kenjiArai 0:5b88d5760320 1968 #if defined(MBEDTLS_SSL_FALLBACK_SCSV)
kenjiArai 0:5b88d5760320 1969 for( i = 0, p = buf + ciph_offset + 2; i < ciph_len; i += 2, p += 2 )
kenjiArai 0:5b88d5760320 1970 {
kenjiArai 0:5b88d5760320 1971 if( p[0] == (unsigned char)( ( MBEDTLS_SSL_FALLBACK_SCSV_VALUE >> 8 ) & 0xff ) &&
kenjiArai 0:5b88d5760320 1972 p[1] == (unsigned char)( ( MBEDTLS_SSL_FALLBACK_SCSV_VALUE ) & 0xff ) )
kenjiArai 0:5b88d5760320 1973 {
kenjiArai 0:5b88d5760320 1974 MBEDTLS_SSL_DEBUG_MSG( 2, ( "received FALLBACK_SCSV" ) );
kenjiArai 0:5b88d5760320 1975
kenjiArai 0:5b88d5760320 1976 if( ssl->minor_ver < ssl->conf->max_minor_ver )
kenjiArai 0:5b88d5760320 1977 {
kenjiArai 0:5b88d5760320 1978 MBEDTLS_SSL_DEBUG_MSG( 1, ( "inapropriate fallback" ) );
kenjiArai 0:5b88d5760320 1979
kenjiArai 0:5b88d5760320 1980 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 1981 MBEDTLS_SSL_ALERT_MSG_INAPROPRIATE_FALLBACK );
kenjiArai 0:5b88d5760320 1982
kenjiArai 0:5b88d5760320 1983 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 1984 }
kenjiArai 0:5b88d5760320 1985
kenjiArai 0:5b88d5760320 1986 break;
kenjiArai 0:5b88d5760320 1987 }
kenjiArai 0:5b88d5760320 1988 }
kenjiArai 0:5b88d5760320 1989 #endif /* MBEDTLS_SSL_FALLBACK_SCSV */
kenjiArai 0:5b88d5760320 1990
kenjiArai 0:5b88d5760320 1991 #if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
kenjiArai 0:5b88d5760320 1992 defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
kenjiArai 0:5b88d5760320 1993
kenjiArai 0:5b88d5760320 1994 /*
kenjiArai 0:5b88d5760320 1995 * Try to fall back to default hash SHA1 if the client
kenjiArai 0:5b88d5760320 1996 * hasn't provided any preferred signature-hash combinations.
kenjiArai 0:5b88d5760320 1997 */
kenjiArai 0:5b88d5760320 1998 if( sig_hash_alg_ext_present == 0 )
kenjiArai 0:5b88d5760320 1999 {
kenjiArai 0:5b88d5760320 2000 mbedtls_md_type_t md_default = MBEDTLS_MD_SHA1;
kenjiArai 0:5b88d5760320 2001
kenjiArai 0:5b88d5760320 2002 if( mbedtls_ssl_check_sig_hash( ssl, md_default ) != 0 )
kenjiArai 0:5b88d5760320 2003 md_default = MBEDTLS_MD_NONE;
kenjiArai 0:5b88d5760320 2004
kenjiArai 0:5b88d5760320 2005 mbedtls_ssl_sig_hash_set_const_hash( &ssl->handshake->hash_algs, md_default );
kenjiArai 0:5b88d5760320 2006 }
kenjiArai 0:5b88d5760320 2007
kenjiArai 0:5b88d5760320 2008 #endif /* MBEDTLS_SSL_PROTO_TLS1_2 &&
kenjiArai 0:5b88d5760320 2009 MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */
kenjiArai 0:5b88d5760320 2010
kenjiArai 0:5b88d5760320 2011 /*
kenjiArai 0:5b88d5760320 2012 * Check for TLS_EMPTY_RENEGOTIATION_INFO_SCSV
kenjiArai 0:5b88d5760320 2013 */
kenjiArai 0:5b88d5760320 2014 for( i = 0, p = buf + ciph_offset + 2; i < ciph_len; i += 2, p += 2 )
kenjiArai 0:5b88d5760320 2015 {
kenjiArai 0:5b88d5760320 2016 if( p[0] == 0 && p[1] == MBEDTLS_SSL_EMPTY_RENEGOTIATION_INFO )
kenjiArai 0:5b88d5760320 2017 {
kenjiArai 0:5b88d5760320 2018 MBEDTLS_SSL_DEBUG_MSG( 3, ( "received TLS_EMPTY_RENEGOTIATION_INFO " ) );
kenjiArai 0:5b88d5760320 2019 #if defined(MBEDTLS_SSL_RENEGOTIATION)
kenjiArai 0:5b88d5760320 2020 if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
kenjiArai 0:5b88d5760320 2021 {
kenjiArai 0:5b88d5760320 2022 MBEDTLS_SSL_DEBUG_MSG( 1, ( "received RENEGOTIATION SCSV "
kenjiArai 0:5b88d5760320 2023 "during renegotiation" ) );
kenjiArai 0:5b88d5760320 2024 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 2025 MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
kenjiArai 0:5b88d5760320 2026 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 2027 }
kenjiArai 0:5b88d5760320 2028 #endif
kenjiArai 0:5b88d5760320 2029 ssl->secure_renegotiation = MBEDTLS_SSL_SECURE_RENEGOTIATION;
kenjiArai 0:5b88d5760320 2030 break;
kenjiArai 0:5b88d5760320 2031 }
kenjiArai 0:5b88d5760320 2032 }
kenjiArai 0:5b88d5760320 2033
kenjiArai 0:5b88d5760320 2034 /*
kenjiArai 0:5b88d5760320 2035 * Renegotiation security checks
kenjiArai 0:5b88d5760320 2036 */
kenjiArai 0:5b88d5760320 2037 if( ssl->secure_renegotiation != MBEDTLS_SSL_SECURE_RENEGOTIATION &&
kenjiArai 0:5b88d5760320 2038 ssl->conf->allow_legacy_renegotiation == MBEDTLS_SSL_LEGACY_BREAK_HANDSHAKE )
kenjiArai 0:5b88d5760320 2039 {
kenjiArai 0:5b88d5760320 2040 MBEDTLS_SSL_DEBUG_MSG( 1, ( "legacy renegotiation, breaking off handshake" ) );
kenjiArai 0:5b88d5760320 2041 handshake_failure = 1;
kenjiArai 0:5b88d5760320 2042 }
kenjiArai 0:5b88d5760320 2043 #if defined(MBEDTLS_SSL_RENEGOTIATION)
kenjiArai 0:5b88d5760320 2044 else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS &&
kenjiArai 0:5b88d5760320 2045 ssl->secure_renegotiation == MBEDTLS_SSL_SECURE_RENEGOTIATION &&
kenjiArai 0:5b88d5760320 2046 renegotiation_info_seen == 0 )
kenjiArai 0:5b88d5760320 2047 {
kenjiArai 0:5b88d5760320 2048 MBEDTLS_SSL_DEBUG_MSG( 1, ( "renegotiation_info extension missing (secure)" ) );
kenjiArai 0:5b88d5760320 2049 handshake_failure = 1;
kenjiArai 0:5b88d5760320 2050 }
kenjiArai 0:5b88d5760320 2051 else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS &&
kenjiArai 0:5b88d5760320 2052 ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION &&
kenjiArai 0:5b88d5760320 2053 ssl->conf->allow_legacy_renegotiation == MBEDTLS_SSL_LEGACY_NO_RENEGOTIATION )
kenjiArai 0:5b88d5760320 2054 {
kenjiArai 0:5b88d5760320 2055 MBEDTLS_SSL_DEBUG_MSG( 1, ( "legacy renegotiation not allowed" ) );
kenjiArai 0:5b88d5760320 2056 handshake_failure = 1;
kenjiArai 0:5b88d5760320 2057 }
kenjiArai 0:5b88d5760320 2058 else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS &&
kenjiArai 0:5b88d5760320 2059 ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION &&
kenjiArai 0:5b88d5760320 2060 renegotiation_info_seen == 1 )
kenjiArai 0:5b88d5760320 2061 {
kenjiArai 0:5b88d5760320 2062 MBEDTLS_SSL_DEBUG_MSG( 1, ( "renegotiation_info extension present (legacy)" ) );
kenjiArai 0:5b88d5760320 2063 handshake_failure = 1;
kenjiArai 0:5b88d5760320 2064 }
kenjiArai 0:5b88d5760320 2065 #endif /* MBEDTLS_SSL_RENEGOTIATION */
kenjiArai 0:5b88d5760320 2066
kenjiArai 0:5b88d5760320 2067 if( handshake_failure == 1 )
kenjiArai 0:5b88d5760320 2068 {
kenjiArai 0:5b88d5760320 2069 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 2070 MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
kenjiArai 0:5b88d5760320 2071 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
kenjiArai 0:5b88d5760320 2072 }
kenjiArai 0:5b88d5760320 2073
kenjiArai 0:5b88d5760320 2074 /*
kenjiArai 0:5b88d5760320 2075 * Search for a matching ciphersuite
kenjiArai 0:5b88d5760320 2076 * (At the end because we need information from the EC-based extensions
kenjiArai 0:5b88d5760320 2077 * and certificate from the SNI callback triggered by the SNI extension.)
kenjiArai 0:5b88d5760320 2078 */
kenjiArai 0:5b88d5760320 2079 got_common_suite = 0;
kenjiArai 0:5b88d5760320 2080 ciphersuites = ssl->conf->ciphersuite_list[ssl->minor_ver];
kenjiArai 0:5b88d5760320 2081 ciphersuite_info = NULL;
kenjiArai 0:5b88d5760320 2082 #if defined(MBEDTLS_SSL_SRV_RESPECT_CLIENT_PREFERENCE)
kenjiArai 0:5b88d5760320 2083 for( j = 0, p = buf + ciph_offset + 2; j < ciph_len; j += 2, p += 2 )
kenjiArai 0:5b88d5760320 2084 for( i = 0; ciphersuites[i] != 0; i++ )
kenjiArai 0:5b88d5760320 2085 #else
kenjiArai 0:5b88d5760320 2086 for( i = 0; ciphersuites[i] != 0; i++ )
kenjiArai 0:5b88d5760320 2087 for( j = 0, p = buf + ciph_offset + 2; j < ciph_len; j += 2, p += 2 )
kenjiArai 0:5b88d5760320 2088 #endif
kenjiArai 0:5b88d5760320 2089 {
kenjiArai 0:5b88d5760320 2090 if( p[0] != ( ( ciphersuites[i] >> 8 ) & 0xFF ) ||
kenjiArai 0:5b88d5760320 2091 p[1] != ( ( ciphersuites[i] ) & 0xFF ) )
kenjiArai 0:5b88d5760320 2092 continue;
kenjiArai 0:5b88d5760320 2093
kenjiArai 0:5b88d5760320 2094 got_common_suite = 1;
kenjiArai 0:5b88d5760320 2095
kenjiArai 0:5b88d5760320 2096 if( ( ret = ssl_ciphersuite_match( ssl, ciphersuites[i],
kenjiArai 0:5b88d5760320 2097 &ciphersuite_info ) ) != 0 )
kenjiArai 0:5b88d5760320 2098 return( ret );
kenjiArai 0:5b88d5760320 2099
kenjiArai 0:5b88d5760320 2100 if( ciphersuite_info != NULL )
kenjiArai 0:5b88d5760320 2101 goto have_ciphersuite;
kenjiArai 0:5b88d5760320 2102 }
kenjiArai 0:5b88d5760320 2103
kenjiArai 0:5b88d5760320 2104 if( got_common_suite )
kenjiArai 0:5b88d5760320 2105 {
kenjiArai 0:5b88d5760320 2106 MBEDTLS_SSL_DEBUG_MSG( 1, ( "got ciphersuites in common, "
kenjiArai 0:5b88d5760320 2107 "but none of them usable" ) );
kenjiArai 0:5b88d5760320 2108 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 2109 MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
kenjiArai 0:5b88d5760320 2110 return( MBEDTLS_ERR_SSL_NO_USABLE_CIPHERSUITE );
kenjiArai 0:5b88d5760320 2111 }
kenjiArai 0:5b88d5760320 2112 else
kenjiArai 0:5b88d5760320 2113 {
kenjiArai 0:5b88d5760320 2114 MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no ciphersuites in common" ) );
kenjiArai 0:5b88d5760320 2115 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 2116 MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
kenjiArai 0:5b88d5760320 2117 return( MBEDTLS_ERR_SSL_NO_CIPHER_CHOSEN );
kenjiArai 0:5b88d5760320 2118 }
kenjiArai 0:5b88d5760320 2119
kenjiArai 0:5b88d5760320 2120 have_ciphersuite:
kenjiArai 0:5b88d5760320 2121 MBEDTLS_SSL_DEBUG_MSG( 2, ( "selected ciphersuite: %s", ciphersuite_info->name ) );
kenjiArai 0:5b88d5760320 2122
kenjiArai 0:5b88d5760320 2123 ssl->session_negotiate->ciphersuite = ciphersuites[i];
kenjiArai 0:5b88d5760320 2124 ssl->handshake->ciphersuite_info = ciphersuite_info;
kenjiArai 0:5b88d5760320 2125
kenjiArai 0:5b88d5760320 2126 ssl->state++;
kenjiArai 0:5b88d5760320 2127
kenjiArai 0:5b88d5760320 2128 #if defined(MBEDTLS_SSL_PROTO_DTLS)
kenjiArai 0:5b88d5760320 2129 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
kenjiArai 0:5b88d5760320 2130 mbedtls_ssl_recv_flight_completed( ssl );
kenjiArai 0:5b88d5760320 2131 #endif
kenjiArai 0:5b88d5760320 2132
kenjiArai 0:5b88d5760320 2133 /* Debugging-only output for testsuite */
kenjiArai 0:5b88d5760320 2134 #if defined(MBEDTLS_DEBUG_C) && \
kenjiArai 0:5b88d5760320 2135 defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
kenjiArai 0:5b88d5760320 2136 defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
kenjiArai 0:5b88d5760320 2137 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
kenjiArai 0:5b88d5760320 2138 {
kenjiArai 0:5b88d5760320 2139 mbedtls_pk_type_t sig_alg = mbedtls_ssl_get_ciphersuite_sig_alg( ciphersuite_info );
kenjiArai 0:5b88d5760320 2140 if( sig_alg != MBEDTLS_PK_NONE )
kenjiArai 0:5b88d5760320 2141 {
kenjiArai 0:5b88d5760320 2142 mbedtls_md_type_t md_alg = mbedtls_ssl_sig_hash_set_find( &ssl->handshake->hash_algs,
kenjiArai 0:5b88d5760320 2143 sig_alg );
kenjiArai 0:5b88d5760320 2144 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello v3, signature_algorithm ext: %d",
kenjiArai 0:5b88d5760320 2145 mbedtls_ssl_hash_from_md_alg( md_alg ) ) );
kenjiArai 0:5b88d5760320 2146 }
kenjiArai 0:5b88d5760320 2147 else
kenjiArai 0:5b88d5760320 2148 {
kenjiArai 0:5b88d5760320 2149 MBEDTLS_SSL_DEBUG_MSG( 3, ( "no hash algorithm for signature algorithm "
kenjiArai 0:5b88d5760320 2150 "%d - should not happen", sig_alg ) );
kenjiArai 0:5b88d5760320 2151 }
kenjiArai 0:5b88d5760320 2152 }
kenjiArai 0:5b88d5760320 2153 #endif
kenjiArai 0:5b88d5760320 2154
kenjiArai 0:5b88d5760320 2155 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse client hello" ) );
kenjiArai 0:5b88d5760320 2156
kenjiArai 0:5b88d5760320 2157 return( 0 );
kenjiArai 0:5b88d5760320 2158 }
kenjiArai 0:5b88d5760320 2159
kenjiArai 0:5b88d5760320 2160 #if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
kenjiArai 0:5b88d5760320 2161 static void ssl_write_truncated_hmac_ext( mbedtls_ssl_context *ssl,
kenjiArai 0:5b88d5760320 2162 unsigned char *buf,
kenjiArai 0:5b88d5760320 2163 size_t *olen )
kenjiArai 0:5b88d5760320 2164 {
kenjiArai 0:5b88d5760320 2165 unsigned char *p = buf;
kenjiArai 0:5b88d5760320 2166
kenjiArai 0:5b88d5760320 2167 if( ssl->session_negotiate->trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_DISABLED )
kenjiArai 0:5b88d5760320 2168 {
kenjiArai 0:5b88d5760320 2169 *olen = 0;
kenjiArai 0:5b88d5760320 2170 return;
kenjiArai 0:5b88d5760320 2171 }
kenjiArai 0:5b88d5760320 2172
kenjiArai 0:5b88d5760320 2173 MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding truncated hmac extension" ) );
kenjiArai 0:5b88d5760320 2174
kenjiArai 0:5b88d5760320 2175 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_TRUNCATED_HMAC >> 8 ) & 0xFF );
kenjiArai 0:5b88d5760320 2176 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_TRUNCATED_HMAC ) & 0xFF );
kenjiArai 0:5b88d5760320 2177
kenjiArai 0:5b88d5760320 2178 *p++ = 0x00;
kenjiArai 0:5b88d5760320 2179 *p++ = 0x00;
kenjiArai 0:5b88d5760320 2180
kenjiArai 0:5b88d5760320 2181 *olen = 4;
kenjiArai 0:5b88d5760320 2182 }
kenjiArai 0:5b88d5760320 2183 #endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
kenjiArai 0:5b88d5760320 2184
kenjiArai 0:5b88d5760320 2185 #if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
kenjiArai 0:5b88d5760320 2186 static void ssl_write_cid_ext( mbedtls_ssl_context *ssl,
kenjiArai 0:5b88d5760320 2187 unsigned char *buf,
kenjiArai 0:5b88d5760320 2188 size_t *olen )
kenjiArai 0:5b88d5760320 2189 {
kenjiArai 0:5b88d5760320 2190 unsigned char *p = buf;
kenjiArai 0:5b88d5760320 2191 size_t ext_len;
kenjiArai 0:5b88d5760320 2192 const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN;
kenjiArai 0:5b88d5760320 2193
kenjiArai 0:5b88d5760320 2194 *olen = 0;
kenjiArai 0:5b88d5760320 2195
kenjiArai 0:5b88d5760320 2196 /* Skip writing the extension if we don't want to use it or if
kenjiArai 0:5b88d5760320 2197 * the client hasn't offered it. */
kenjiArai 0:5b88d5760320 2198 if( ssl->handshake->cid_in_use == MBEDTLS_SSL_CID_DISABLED )
kenjiArai 0:5b88d5760320 2199 return;
kenjiArai 0:5b88d5760320 2200
kenjiArai 0:5b88d5760320 2201 /* ssl->own_cid_len is at most MBEDTLS_SSL_CID_IN_LEN_MAX
kenjiArai 0:5b88d5760320 2202 * which is at most 255, so the increment cannot overflow. */
kenjiArai 0:5b88d5760320 2203 if( end < p || (size_t)( end - p ) < (unsigned)( ssl->own_cid_len + 5 ) )
kenjiArai 0:5b88d5760320 2204 {
kenjiArai 0:5b88d5760320 2205 MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
kenjiArai 0:5b88d5760320 2206 return;
kenjiArai 0:5b88d5760320 2207 }
kenjiArai 0:5b88d5760320 2208
kenjiArai 0:5b88d5760320 2209 MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding CID extension" ) );
kenjiArai 0:5b88d5760320 2210
kenjiArai 0:5b88d5760320 2211 /*
kenjiArai 0:5b88d5760320 2212 * Quoting draft-ietf-tls-dtls-connection-id-05
kenjiArai 0:5b88d5760320 2213 * https://tools.ietf.org/html/draft-ietf-tls-dtls-connection-id-05
kenjiArai 0:5b88d5760320 2214 *
kenjiArai 0:5b88d5760320 2215 * struct {
kenjiArai 0:5b88d5760320 2216 * opaque cid<0..2^8-1>;
kenjiArai 0:5b88d5760320 2217 * } ConnectionId;
kenjiArai 0:5b88d5760320 2218 */
kenjiArai 0:5b88d5760320 2219
kenjiArai 0:5b88d5760320 2220 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_CID >> 8 ) & 0xFF );
kenjiArai 0:5b88d5760320 2221 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_CID ) & 0xFF );
kenjiArai 0:5b88d5760320 2222 ext_len = (size_t) ssl->own_cid_len + 1;
kenjiArai 0:5b88d5760320 2223 *p++ = (unsigned char)( ( ext_len >> 8 ) & 0xFF );
kenjiArai 0:5b88d5760320 2224 *p++ = (unsigned char)( ( ext_len ) & 0xFF );
kenjiArai 0:5b88d5760320 2225
kenjiArai 0:5b88d5760320 2226 *p++ = (uint8_t) ssl->own_cid_len;
kenjiArai 0:5b88d5760320 2227 memcpy( p, ssl->own_cid, ssl->own_cid_len );
kenjiArai 0:5b88d5760320 2228
kenjiArai 0:5b88d5760320 2229 *olen = ssl->own_cid_len + 5;
kenjiArai 0:5b88d5760320 2230 }
kenjiArai 0:5b88d5760320 2231 #endif /* MBEDTLS_SSL_DTLS_CONNECTION_ID */
kenjiArai 0:5b88d5760320 2232
kenjiArai 0:5b88d5760320 2233 #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
kenjiArai 0:5b88d5760320 2234 static void ssl_write_encrypt_then_mac_ext( mbedtls_ssl_context *ssl,
kenjiArai 0:5b88d5760320 2235 unsigned char *buf,
kenjiArai 0:5b88d5760320 2236 size_t *olen )
kenjiArai 0:5b88d5760320 2237 {
kenjiArai 0:5b88d5760320 2238 unsigned char *p = buf;
kenjiArai 0:5b88d5760320 2239 const mbedtls_ssl_ciphersuite_t *suite = NULL;
kenjiArai 0:5b88d5760320 2240 const mbedtls_cipher_info_t *cipher = NULL;
kenjiArai 0:5b88d5760320 2241
kenjiArai 0:5b88d5760320 2242 if( ssl->session_negotiate->encrypt_then_mac == MBEDTLS_SSL_ETM_DISABLED ||
kenjiArai 0:5b88d5760320 2243 ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
kenjiArai 0:5b88d5760320 2244 {
kenjiArai 0:5b88d5760320 2245 *olen = 0;
kenjiArai 0:5b88d5760320 2246 return;
kenjiArai 0:5b88d5760320 2247 }
kenjiArai 0:5b88d5760320 2248
kenjiArai 0:5b88d5760320 2249 /*
kenjiArai 0:5b88d5760320 2250 * RFC 7366: "If a server receives an encrypt-then-MAC request extension
kenjiArai 0:5b88d5760320 2251 * from a client and then selects a stream or Authenticated Encryption
kenjiArai 0:5b88d5760320 2252 * with Associated Data (AEAD) ciphersuite, it MUST NOT send an
kenjiArai 0:5b88d5760320 2253 * encrypt-then-MAC response extension back to the client."
kenjiArai 0:5b88d5760320 2254 */
kenjiArai 0:5b88d5760320 2255 if( ( suite = mbedtls_ssl_ciphersuite_from_id(
kenjiArai 0:5b88d5760320 2256 ssl->session_negotiate->ciphersuite ) ) == NULL ||
kenjiArai 0:5b88d5760320 2257 ( cipher = mbedtls_cipher_info_from_type( suite->cipher ) ) == NULL ||
kenjiArai 0:5b88d5760320 2258 cipher->mode != MBEDTLS_MODE_CBC )
kenjiArai 0:5b88d5760320 2259 {
kenjiArai 0:5b88d5760320 2260 *olen = 0;
kenjiArai 0:5b88d5760320 2261 return;
kenjiArai 0:5b88d5760320 2262 }
kenjiArai 0:5b88d5760320 2263
kenjiArai 0:5b88d5760320 2264 MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding encrypt then mac extension" ) );
kenjiArai 0:5b88d5760320 2265
kenjiArai 0:5b88d5760320 2266 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC >> 8 ) & 0xFF );
kenjiArai 0:5b88d5760320 2267 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC ) & 0xFF );
kenjiArai 0:5b88d5760320 2268
kenjiArai 0:5b88d5760320 2269 *p++ = 0x00;
kenjiArai 0:5b88d5760320 2270 *p++ = 0x00;
kenjiArai 0:5b88d5760320 2271
kenjiArai 0:5b88d5760320 2272 *olen = 4;
kenjiArai 0:5b88d5760320 2273 }
kenjiArai 0:5b88d5760320 2274 #endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
kenjiArai 0:5b88d5760320 2275
kenjiArai 0:5b88d5760320 2276 #if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
kenjiArai 0:5b88d5760320 2277 static void ssl_write_extended_ms_ext( mbedtls_ssl_context *ssl,
kenjiArai 0:5b88d5760320 2278 unsigned char *buf,
kenjiArai 0:5b88d5760320 2279 size_t *olen )
kenjiArai 0:5b88d5760320 2280 {
kenjiArai 0:5b88d5760320 2281 unsigned char *p = buf;
kenjiArai 0:5b88d5760320 2282
kenjiArai 0:5b88d5760320 2283 if( ssl->handshake->extended_ms == MBEDTLS_SSL_EXTENDED_MS_DISABLED ||
kenjiArai 0:5b88d5760320 2284 ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
kenjiArai 0:5b88d5760320 2285 {
kenjiArai 0:5b88d5760320 2286 *olen = 0;
kenjiArai 0:5b88d5760320 2287 return;
kenjiArai 0:5b88d5760320 2288 }
kenjiArai 0:5b88d5760320 2289
kenjiArai 0:5b88d5760320 2290 MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding extended master secret "
kenjiArai 0:5b88d5760320 2291 "extension" ) );
kenjiArai 0:5b88d5760320 2292
kenjiArai 0:5b88d5760320 2293 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET >> 8 ) & 0xFF );
kenjiArai 0:5b88d5760320 2294 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET ) & 0xFF );
kenjiArai 0:5b88d5760320 2295
kenjiArai 0:5b88d5760320 2296 *p++ = 0x00;
kenjiArai 0:5b88d5760320 2297 *p++ = 0x00;
kenjiArai 0:5b88d5760320 2298
kenjiArai 0:5b88d5760320 2299 *olen = 4;
kenjiArai 0:5b88d5760320 2300 }
kenjiArai 0:5b88d5760320 2301 #endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */
kenjiArai 0:5b88d5760320 2302
kenjiArai 0:5b88d5760320 2303 #if defined(MBEDTLS_SSL_SESSION_TICKETS)
kenjiArai 0:5b88d5760320 2304 static void ssl_write_session_ticket_ext( mbedtls_ssl_context *ssl,
kenjiArai 0:5b88d5760320 2305 unsigned char *buf,
kenjiArai 0:5b88d5760320 2306 size_t *olen )
kenjiArai 0:5b88d5760320 2307 {
kenjiArai 0:5b88d5760320 2308 unsigned char *p = buf;
kenjiArai 0:5b88d5760320 2309
kenjiArai 0:5b88d5760320 2310 if( ssl->handshake->new_session_ticket == 0 )
kenjiArai 0:5b88d5760320 2311 {
kenjiArai 0:5b88d5760320 2312 *olen = 0;
kenjiArai 0:5b88d5760320 2313 return;
kenjiArai 0:5b88d5760320 2314 }
kenjiArai 0:5b88d5760320 2315
kenjiArai 0:5b88d5760320 2316 MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding session ticket extension" ) );
kenjiArai 0:5b88d5760320 2317
kenjiArai 0:5b88d5760320 2318 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SESSION_TICKET >> 8 ) & 0xFF );
kenjiArai 0:5b88d5760320 2319 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SESSION_TICKET ) & 0xFF );
kenjiArai 0:5b88d5760320 2320
kenjiArai 0:5b88d5760320 2321 *p++ = 0x00;
kenjiArai 0:5b88d5760320 2322 *p++ = 0x00;
kenjiArai 0:5b88d5760320 2323
kenjiArai 0:5b88d5760320 2324 *olen = 4;
kenjiArai 0:5b88d5760320 2325 }
kenjiArai 0:5b88d5760320 2326 #endif /* MBEDTLS_SSL_SESSION_TICKETS */
kenjiArai 0:5b88d5760320 2327
kenjiArai 0:5b88d5760320 2328 static void ssl_write_renegotiation_ext( mbedtls_ssl_context *ssl,
kenjiArai 0:5b88d5760320 2329 unsigned char *buf,
kenjiArai 0:5b88d5760320 2330 size_t *olen )
kenjiArai 0:5b88d5760320 2331 {
kenjiArai 0:5b88d5760320 2332 unsigned char *p = buf;
kenjiArai 0:5b88d5760320 2333
kenjiArai 0:5b88d5760320 2334 if( ssl->secure_renegotiation != MBEDTLS_SSL_SECURE_RENEGOTIATION )
kenjiArai 0:5b88d5760320 2335 {
kenjiArai 0:5b88d5760320 2336 *olen = 0;
kenjiArai 0:5b88d5760320 2337 return;
kenjiArai 0:5b88d5760320 2338 }
kenjiArai 0:5b88d5760320 2339
kenjiArai 0:5b88d5760320 2340 MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, secure renegotiation extension" ) );
kenjiArai 0:5b88d5760320 2341
kenjiArai 0:5b88d5760320 2342 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_RENEGOTIATION_INFO >> 8 ) & 0xFF );
kenjiArai 0:5b88d5760320 2343 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_RENEGOTIATION_INFO ) & 0xFF );
kenjiArai 0:5b88d5760320 2344
kenjiArai 0:5b88d5760320 2345 #if defined(MBEDTLS_SSL_RENEGOTIATION)
kenjiArai 0:5b88d5760320 2346 if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE )
kenjiArai 0:5b88d5760320 2347 {
kenjiArai 0:5b88d5760320 2348 *p++ = 0x00;
kenjiArai 0:5b88d5760320 2349 *p++ = ( ssl->verify_data_len * 2 + 1 ) & 0xFF;
kenjiArai 0:5b88d5760320 2350 *p++ = ssl->verify_data_len * 2 & 0xFF;
kenjiArai 0:5b88d5760320 2351
kenjiArai 0:5b88d5760320 2352 memcpy( p, ssl->peer_verify_data, ssl->verify_data_len );
kenjiArai 0:5b88d5760320 2353 p += ssl->verify_data_len;
kenjiArai 0:5b88d5760320 2354 memcpy( p, ssl->own_verify_data, ssl->verify_data_len );
kenjiArai 0:5b88d5760320 2355 p += ssl->verify_data_len;
kenjiArai 0:5b88d5760320 2356 }
kenjiArai 0:5b88d5760320 2357 else
kenjiArai 0:5b88d5760320 2358 #endif /* MBEDTLS_SSL_RENEGOTIATION */
kenjiArai 0:5b88d5760320 2359 {
kenjiArai 0:5b88d5760320 2360 *p++ = 0x00;
kenjiArai 0:5b88d5760320 2361 *p++ = 0x01;
kenjiArai 0:5b88d5760320 2362 *p++ = 0x00;
kenjiArai 0:5b88d5760320 2363 }
kenjiArai 0:5b88d5760320 2364
kenjiArai 0:5b88d5760320 2365 *olen = p - buf;
kenjiArai 0:5b88d5760320 2366 }
kenjiArai 0:5b88d5760320 2367
kenjiArai 0:5b88d5760320 2368 #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
kenjiArai 0:5b88d5760320 2369 static void ssl_write_max_fragment_length_ext( mbedtls_ssl_context *ssl,
kenjiArai 0:5b88d5760320 2370 unsigned char *buf,
kenjiArai 0:5b88d5760320 2371 size_t *olen )
kenjiArai 0:5b88d5760320 2372 {
kenjiArai 0:5b88d5760320 2373 unsigned char *p = buf;
kenjiArai 0:5b88d5760320 2374
kenjiArai 0:5b88d5760320 2375 if( ssl->session_negotiate->mfl_code == MBEDTLS_SSL_MAX_FRAG_LEN_NONE )
kenjiArai 0:5b88d5760320 2376 {
kenjiArai 0:5b88d5760320 2377 *olen = 0;
kenjiArai 0:5b88d5760320 2378 return;
kenjiArai 0:5b88d5760320 2379 }
kenjiArai 0:5b88d5760320 2380
kenjiArai 0:5b88d5760320 2381 MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, max_fragment_length extension" ) );
kenjiArai 0:5b88d5760320 2382
kenjiArai 0:5b88d5760320 2383 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH >> 8 ) & 0xFF );
kenjiArai 0:5b88d5760320 2384 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH ) & 0xFF );
kenjiArai 0:5b88d5760320 2385
kenjiArai 0:5b88d5760320 2386 *p++ = 0x00;
kenjiArai 0:5b88d5760320 2387 *p++ = 1;
kenjiArai 0:5b88d5760320 2388
kenjiArai 0:5b88d5760320 2389 *p++ = ssl->session_negotiate->mfl_code;
kenjiArai 0:5b88d5760320 2390
kenjiArai 0:5b88d5760320 2391 *olen = 5;
kenjiArai 0:5b88d5760320 2392 }
kenjiArai 0:5b88d5760320 2393 #endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
kenjiArai 0:5b88d5760320 2394
kenjiArai 0:5b88d5760320 2395 #if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \
kenjiArai 0:5b88d5760320 2396 defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
kenjiArai 0:5b88d5760320 2397 static void ssl_write_supported_point_formats_ext( mbedtls_ssl_context *ssl,
kenjiArai 0:5b88d5760320 2398 unsigned char *buf,
kenjiArai 0:5b88d5760320 2399 size_t *olen )
kenjiArai 0:5b88d5760320 2400 {
kenjiArai 0:5b88d5760320 2401 unsigned char *p = buf;
kenjiArai 0:5b88d5760320 2402 ((void) ssl);
kenjiArai 0:5b88d5760320 2403
kenjiArai 0:5b88d5760320 2404 if( ( ssl->handshake->cli_exts &
kenjiArai 0:5b88d5760320 2405 MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS_PRESENT ) == 0 )
kenjiArai 0:5b88d5760320 2406 {
kenjiArai 0:5b88d5760320 2407 *olen = 0;
kenjiArai 0:5b88d5760320 2408 return;
kenjiArai 0:5b88d5760320 2409 }
kenjiArai 0:5b88d5760320 2410
kenjiArai 0:5b88d5760320 2411 MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, supported_point_formats extension" ) );
kenjiArai 0:5b88d5760320 2412
kenjiArai 0:5b88d5760320 2413 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS >> 8 ) & 0xFF );
kenjiArai 0:5b88d5760320 2414 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS ) & 0xFF );
kenjiArai 0:5b88d5760320 2415
kenjiArai 0:5b88d5760320 2416 *p++ = 0x00;
kenjiArai 0:5b88d5760320 2417 *p++ = 2;
kenjiArai 0:5b88d5760320 2418
kenjiArai 0:5b88d5760320 2419 *p++ = 1;
kenjiArai 0:5b88d5760320 2420 *p++ = MBEDTLS_ECP_PF_UNCOMPRESSED;
kenjiArai 0:5b88d5760320 2421
kenjiArai 0:5b88d5760320 2422 *olen = 6;
kenjiArai 0:5b88d5760320 2423 }
kenjiArai 0:5b88d5760320 2424 #endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C || MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
kenjiArai 0:5b88d5760320 2425
kenjiArai 0:5b88d5760320 2426 #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
kenjiArai 0:5b88d5760320 2427 static void ssl_write_ecjpake_kkpp_ext( mbedtls_ssl_context *ssl,
kenjiArai 0:5b88d5760320 2428 unsigned char *buf,
kenjiArai 0:5b88d5760320 2429 size_t *olen )
kenjiArai 0:5b88d5760320 2430 {
kenjiArai 0:5b88d5760320 2431 int ret;
kenjiArai 0:5b88d5760320 2432 unsigned char *p = buf;
kenjiArai 0:5b88d5760320 2433 const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN;
kenjiArai 0:5b88d5760320 2434 size_t kkpp_len;
kenjiArai 0:5b88d5760320 2435
kenjiArai 0:5b88d5760320 2436 *olen = 0;
kenjiArai 0:5b88d5760320 2437
kenjiArai 0:5b88d5760320 2438 /* Skip costly computation if not needed */
kenjiArai 0:5b88d5760320 2439 if( ssl->handshake->ciphersuite_info->key_exchange !=
kenjiArai 0:5b88d5760320 2440 MBEDTLS_KEY_EXCHANGE_ECJPAKE )
kenjiArai 0:5b88d5760320 2441 return;
kenjiArai 0:5b88d5760320 2442
kenjiArai 0:5b88d5760320 2443 MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, ecjpake kkpp extension" ) );
kenjiArai 0:5b88d5760320 2444
kenjiArai 0:5b88d5760320 2445 if( end - p < 4 )
kenjiArai 0:5b88d5760320 2446 {
kenjiArai 0:5b88d5760320 2447 MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
kenjiArai 0:5b88d5760320 2448 return;
kenjiArai 0:5b88d5760320 2449 }
kenjiArai 0:5b88d5760320 2450
kenjiArai 0:5b88d5760320 2451 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ECJPAKE_KKPP >> 8 ) & 0xFF );
kenjiArai 0:5b88d5760320 2452 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ECJPAKE_KKPP ) & 0xFF );
kenjiArai 0:5b88d5760320 2453
kenjiArai 0:5b88d5760320 2454 ret = mbedtls_ecjpake_write_round_one( &ssl->handshake->ecjpake_ctx,
kenjiArai 0:5b88d5760320 2455 p + 2, end - p - 2, &kkpp_len,
kenjiArai 0:5b88d5760320 2456 ssl->conf->f_rng, ssl->conf->p_rng );
kenjiArai 0:5b88d5760320 2457 if( ret != 0 )
kenjiArai 0:5b88d5760320 2458 {
kenjiArai 0:5b88d5760320 2459 MBEDTLS_SSL_DEBUG_RET( 1 , "mbedtls_ecjpake_write_round_one", ret );
kenjiArai 0:5b88d5760320 2460 return;
kenjiArai 0:5b88d5760320 2461 }
kenjiArai 0:5b88d5760320 2462
kenjiArai 0:5b88d5760320 2463 *p++ = (unsigned char)( ( kkpp_len >> 8 ) & 0xFF );
kenjiArai 0:5b88d5760320 2464 *p++ = (unsigned char)( ( kkpp_len ) & 0xFF );
kenjiArai 0:5b88d5760320 2465
kenjiArai 0:5b88d5760320 2466 *olen = kkpp_len + 4;
kenjiArai 0:5b88d5760320 2467 }
kenjiArai 0:5b88d5760320 2468 #endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
kenjiArai 0:5b88d5760320 2469
kenjiArai 0:5b88d5760320 2470 #if defined(MBEDTLS_SSL_ALPN )
kenjiArai 0:5b88d5760320 2471 static void ssl_write_alpn_ext( mbedtls_ssl_context *ssl,
kenjiArai 0:5b88d5760320 2472 unsigned char *buf, size_t *olen )
kenjiArai 0:5b88d5760320 2473 {
kenjiArai 0:5b88d5760320 2474 if( ssl->alpn_chosen == NULL )
kenjiArai 0:5b88d5760320 2475 {
kenjiArai 0:5b88d5760320 2476 *olen = 0;
kenjiArai 0:5b88d5760320 2477 return;
kenjiArai 0:5b88d5760320 2478 }
kenjiArai 0:5b88d5760320 2479
kenjiArai 0:5b88d5760320 2480 MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, adding alpn extension" ) );
kenjiArai 0:5b88d5760320 2481
kenjiArai 0:5b88d5760320 2482 /*
kenjiArai 0:5b88d5760320 2483 * 0 . 1 ext identifier
kenjiArai 0:5b88d5760320 2484 * 2 . 3 ext length
kenjiArai 0:5b88d5760320 2485 * 4 . 5 protocol list length
kenjiArai 0:5b88d5760320 2486 * 6 . 6 protocol name length
kenjiArai 0:5b88d5760320 2487 * 7 . 7+n protocol name
kenjiArai 0:5b88d5760320 2488 */
kenjiArai 0:5b88d5760320 2489 buf[0] = (unsigned char)( ( MBEDTLS_TLS_EXT_ALPN >> 8 ) & 0xFF );
kenjiArai 0:5b88d5760320 2490 buf[1] = (unsigned char)( ( MBEDTLS_TLS_EXT_ALPN ) & 0xFF );
kenjiArai 0:5b88d5760320 2491
kenjiArai 0:5b88d5760320 2492 *olen = 7 + strlen( ssl->alpn_chosen );
kenjiArai 0:5b88d5760320 2493
kenjiArai 0:5b88d5760320 2494 buf[2] = (unsigned char)( ( ( *olen - 4 ) >> 8 ) & 0xFF );
kenjiArai 0:5b88d5760320 2495 buf[3] = (unsigned char)( ( ( *olen - 4 ) ) & 0xFF );
kenjiArai 0:5b88d5760320 2496
kenjiArai 0:5b88d5760320 2497 buf[4] = (unsigned char)( ( ( *olen - 6 ) >> 8 ) & 0xFF );
kenjiArai 0:5b88d5760320 2498 buf[5] = (unsigned char)( ( ( *olen - 6 ) ) & 0xFF );
kenjiArai 0:5b88d5760320 2499
kenjiArai 0:5b88d5760320 2500 buf[6] = (unsigned char)( ( ( *olen - 7 ) ) & 0xFF );
kenjiArai 0:5b88d5760320 2501
kenjiArai 0:5b88d5760320 2502 memcpy( buf + 7, ssl->alpn_chosen, *olen - 7 );
kenjiArai 0:5b88d5760320 2503 }
kenjiArai 0:5b88d5760320 2504 #endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C */
kenjiArai 0:5b88d5760320 2505
kenjiArai 0:5b88d5760320 2506 #if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY)
kenjiArai 0:5b88d5760320 2507 static int ssl_write_hello_verify_request( mbedtls_ssl_context *ssl )
kenjiArai 0:5b88d5760320 2508 {
kenjiArai 0:5b88d5760320 2509 int ret;
kenjiArai 0:5b88d5760320 2510 unsigned char *p = ssl->out_msg + 4;
kenjiArai 0:5b88d5760320 2511 unsigned char *cookie_len_byte;
kenjiArai 0:5b88d5760320 2512
kenjiArai 0:5b88d5760320 2513 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write hello verify request" ) );
kenjiArai 0:5b88d5760320 2514
kenjiArai 0:5b88d5760320 2515 /*
kenjiArai 0:5b88d5760320 2516 * struct {
kenjiArai 0:5b88d5760320 2517 * ProtocolVersion server_version;
kenjiArai 0:5b88d5760320 2518 * opaque cookie<0..2^8-1>;
kenjiArai 0:5b88d5760320 2519 * } HelloVerifyRequest;
kenjiArai 0:5b88d5760320 2520 */
kenjiArai 0:5b88d5760320 2521
kenjiArai 0:5b88d5760320 2522 /* The RFC is not clear on this point, but sending the actual negotiated
kenjiArai 0:5b88d5760320 2523 * version looks like the most interoperable thing to do. */
kenjiArai 0:5b88d5760320 2524 mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver,
kenjiArai 0:5b88d5760320 2525 ssl->conf->transport, p );
kenjiArai 0:5b88d5760320 2526 MBEDTLS_SSL_DEBUG_BUF( 3, "server version", p, 2 );
kenjiArai 0:5b88d5760320 2527 p += 2;
kenjiArai 0:5b88d5760320 2528
kenjiArai 0:5b88d5760320 2529 /* If we get here, f_cookie_check is not null */
kenjiArai 0:5b88d5760320 2530 if( ssl->conf->f_cookie_write == NULL )
kenjiArai 0:5b88d5760320 2531 {
kenjiArai 0:5b88d5760320 2532 MBEDTLS_SSL_DEBUG_MSG( 1, ( "inconsistent cookie callbacks" ) );
kenjiArai 0:5b88d5760320 2533 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
kenjiArai 0:5b88d5760320 2534 }
kenjiArai 0:5b88d5760320 2535
kenjiArai 0:5b88d5760320 2536 /* Skip length byte until we know the length */
kenjiArai 0:5b88d5760320 2537 cookie_len_byte = p++;
kenjiArai 0:5b88d5760320 2538
kenjiArai 0:5b88d5760320 2539 if( ( ret = ssl->conf->f_cookie_write( ssl->conf->p_cookie,
kenjiArai 0:5b88d5760320 2540 &p, ssl->out_buf + MBEDTLS_SSL_OUT_BUFFER_LEN,
kenjiArai 0:5b88d5760320 2541 ssl->cli_id, ssl->cli_id_len ) ) != 0 )
kenjiArai 0:5b88d5760320 2542 {
kenjiArai 0:5b88d5760320 2543 MBEDTLS_SSL_DEBUG_RET( 1, "f_cookie_write", ret );
kenjiArai 0:5b88d5760320 2544 return( ret );
kenjiArai 0:5b88d5760320 2545 }
kenjiArai 0:5b88d5760320 2546
kenjiArai 0:5b88d5760320 2547 *cookie_len_byte = (unsigned char)( p - ( cookie_len_byte + 1 ) );
kenjiArai 0:5b88d5760320 2548
kenjiArai 0:5b88d5760320 2549 MBEDTLS_SSL_DEBUG_BUF( 3, "cookie sent", cookie_len_byte + 1, *cookie_len_byte );
kenjiArai 0:5b88d5760320 2550
kenjiArai 0:5b88d5760320 2551 ssl->out_msglen = p - ssl->out_msg;
kenjiArai 0:5b88d5760320 2552 ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
kenjiArai 0:5b88d5760320 2553 ssl->out_msg[0] = MBEDTLS_SSL_HS_HELLO_VERIFY_REQUEST;
kenjiArai 0:5b88d5760320 2554
kenjiArai 0:5b88d5760320 2555 ssl->state = MBEDTLS_SSL_SERVER_HELLO_VERIFY_REQUEST_SENT;
kenjiArai 0:5b88d5760320 2556
kenjiArai 0:5b88d5760320 2557 if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 )
kenjiArai 0:5b88d5760320 2558 {
kenjiArai 0:5b88d5760320 2559 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret );
kenjiArai 0:5b88d5760320 2560 return( ret );
kenjiArai 0:5b88d5760320 2561 }
kenjiArai 0:5b88d5760320 2562
kenjiArai 0:5b88d5760320 2563 #if defined(MBEDTLS_SSL_PROTO_DTLS)
kenjiArai 0:5b88d5760320 2564 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
kenjiArai 0:5b88d5760320 2565 ( ret = mbedtls_ssl_flight_transmit( ssl ) ) != 0 )
kenjiArai 0:5b88d5760320 2566 {
kenjiArai 0:5b88d5760320 2567 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_flight_transmit", ret );
kenjiArai 0:5b88d5760320 2568 return( ret );
kenjiArai 0:5b88d5760320 2569 }
kenjiArai 0:5b88d5760320 2570 #endif /* MBEDTLS_SSL_PROTO_DTLS */
kenjiArai 0:5b88d5760320 2571
kenjiArai 0:5b88d5760320 2572 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write hello verify request" ) );
kenjiArai 0:5b88d5760320 2573
kenjiArai 0:5b88d5760320 2574 return( 0 );
kenjiArai 0:5b88d5760320 2575 }
kenjiArai 0:5b88d5760320 2576 #endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY */
kenjiArai 0:5b88d5760320 2577
kenjiArai 0:5b88d5760320 2578 static int ssl_write_server_hello( mbedtls_ssl_context *ssl )
kenjiArai 0:5b88d5760320 2579 {
kenjiArai 0:5b88d5760320 2580 #if defined(MBEDTLS_HAVE_TIME)
kenjiArai 0:5b88d5760320 2581 mbedtls_time_t t;
kenjiArai 0:5b88d5760320 2582 #endif
kenjiArai 0:5b88d5760320 2583 int ret;
kenjiArai 0:5b88d5760320 2584 size_t olen, ext_len = 0, n;
kenjiArai 0:5b88d5760320 2585 unsigned char *buf, *p;
kenjiArai 0:5b88d5760320 2586
kenjiArai 0:5b88d5760320 2587 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write server hello" ) );
kenjiArai 0:5b88d5760320 2588
kenjiArai 0:5b88d5760320 2589 #if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY)
kenjiArai 0:5b88d5760320 2590 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
kenjiArai 0:5b88d5760320 2591 ssl->handshake->verify_cookie_len != 0 )
kenjiArai 0:5b88d5760320 2592 {
kenjiArai 0:5b88d5760320 2593 MBEDTLS_SSL_DEBUG_MSG( 2, ( "client hello was not authenticated" ) );
kenjiArai 0:5b88d5760320 2594 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write server hello" ) );
kenjiArai 0:5b88d5760320 2595
kenjiArai 0:5b88d5760320 2596 return( ssl_write_hello_verify_request( ssl ) );
kenjiArai 0:5b88d5760320 2597 }
kenjiArai 0:5b88d5760320 2598 #endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY */
kenjiArai 0:5b88d5760320 2599
kenjiArai 0:5b88d5760320 2600 if( ssl->conf->f_rng == NULL )
kenjiArai 0:5b88d5760320 2601 {
kenjiArai 0:5b88d5760320 2602 MBEDTLS_SSL_DEBUG_MSG( 1, ( "no RNG provided") );
kenjiArai 0:5b88d5760320 2603 return( MBEDTLS_ERR_SSL_NO_RNG );
kenjiArai 0:5b88d5760320 2604 }
kenjiArai 0:5b88d5760320 2605
kenjiArai 0:5b88d5760320 2606 /*
kenjiArai 0:5b88d5760320 2607 * 0 . 0 handshake type
kenjiArai 0:5b88d5760320 2608 * 1 . 3 handshake length
kenjiArai 0:5b88d5760320 2609 * 4 . 5 protocol version
kenjiArai 0:5b88d5760320 2610 * 6 . 9 UNIX time()
kenjiArai 0:5b88d5760320 2611 * 10 . 37 random bytes
kenjiArai 0:5b88d5760320 2612 */
kenjiArai 0:5b88d5760320 2613 buf = ssl->out_msg;
kenjiArai 0:5b88d5760320 2614 p = buf + 4;
kenjiArai 0:5b88d5760320 2615
kenjiArai 0:5b88d5760320 2616 mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver,
kenjiArai 0:5b88d5760320 2617 ssl->conf->transport, p );
kenjiArai 0:5b88d5760320 2618 p += 2;
kenjiArai 0:5b88d5760320 2619
kenjiArai 0:5b88d5760320 2620 MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, chosen version: [%d:%d]",
kenjiArai 0:5b88d5760320 2621 buf[4], buf[5] ) );
kenjiArai 0:5b88d5760320 2622
kenjiArai 0:5b88d5760320 2623 #if defined(MBEDTLS_HAVE_TIME)
kenjiArai 0:5b88d5760320 2624 t = mbedtls_time( NULL );
kenjiArai 0:5b88d5760320 2625 *p++ = (unsigned char)( t >> 24 );
kenjiArai 0:5b88d5760320 2626 *p++ = (unsigned char)( t >> 16 );
kenjiArai 0:5b88d5760320 2627 *p++ = (unsigned char)( t >> 8 );
kenjiArai 0:5b88d5760320 2628 *p++ = (unsigned char)( t );
kenjiArai 0:5b88d5760320 2629
kenjiArai 0:5b88d5760320 2630 MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, current time: %lu", t ) );
kenjiArai 0:5b88d5760320 2631 #else
kenjiArai 0:5b88d5760320 2632 if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, p, 4 ) ) != 0 )
kenjiArai 0:5b88d5760320 2633 return( ret );
kenjiArai 0:5b88d5760320 2634
kenjiArai 0:5b88d5760320 2635 p += 4;
kenjiArai 0:5b88d5760320 2636 #endif /* MBEDTLS_HAVE_TIME */
kenjiArai 0:5b88d5760320 2637
kenjiArai 0:5b88d5760320 2638 if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, p, 28 ) ) != 0 )
kenjiArai 0:5b88d5760320 2639 return( ret );
kenjiArai 0:5b88d5760320 2640
kenjiArai 0:5b88d5760320 2641 p += 28;
kenjiArai 0:5b88d5760320 2642
kenjiArai 0:5b88d5760320 2643 memcpy( ssl->handshake->randbytes + 32, buf + 6, 32 );
kenjiArai 0:5b88d5760320 2644
kenjiArai 0:5b88d5760320 2645 MBEDTLS_SSL_DEBUG_BUF( 3, "server hello, random bytes", buf + 6, 32 );
kenjiArai 0:5b88d5760320 2646
kenjiArai 0:5b88d5760320 2647 /*
kenjiArai 0:5b88d5760320 2648 * Resume is 0 by default, see ssl_handshake_init().
kenjiArai 0:5b88d5760320 2649 * It may be already set to 1 by ssl_parse_session_ticket_ext().
kenjiArai 0:5b88d5760320 2650 * If not, try looking up session ID in our cache.
kenjiArai 0:5b88d5760320 2651 */
kenjiArai 0:5b88d5760320 2652 if( ssl->handshake->resume == 0 &&
kenjiArai 0:5b88d5760320 2653 #if defined(MBEDTLS_SSL_RENEGOTIATION)
kenjiArai 0:5b88d5760320 2654 ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE &&
kenjiArai 0:5b88d5760320 2655 #endif
kenjiArai 0:5b88d5760320 2656 ssl->session_negotiate->id_len != 0 &&
kenjiArai 0:5b88d5760320 2657 ssl->conf->f_get_cache != NULL &&
kenjiArai 0:5b88d5760320 2658 ssl->conf->f_get_cache( ssl->conf->p_cache, ssl->session_negotiate ) == 0 )
kenjiArai 0:5b88d5760320 2659 {
kenjiArai 0:5b88d5760320 2660 MBEDTLS_SSL_DEBUG_MSG( 3, ( "session successfully restored from cache" ) );
kenjiArai 0:5b88d5760320 2661 ssl->handshake->resume = 1;
kenjiArai 0:5b88d5760320 2662 }
kenjiArai 0:5b88d5760320 2663
kenjiArai 0:5b88d5760320 2664 if( ssl->handshake->resume == 0 )
kenjiArai 0:5b88d5760320 2665 {
kenjiArai 0:5b88d5760320 2666 /*
kenjiArai 0:5b88d5760320 2667 * New session, create a new session id,
kenjiArai 0:5b88d5760320 2668 * unless we're about to issue a session ticket
kenjiArai 0:5b88d5760320 2669 */
kenjiArai 0:5b88d5760320 2670 ssl->state++;
kenjiArai 0:5b88d5760320 2671
kenjiArai 0:5b88d5760320 2672 #if defined(MBEDTLS_HAVE_TIME)
kenjiArai 0:5b88d5760320 2673 ssl->session_negotiate->start = mbedtls_time( NULL );
kenjiArai 0:5b88d5760320 2674 #endif
kenjiArai 0:5b88d5760320 2675
kenjiArai 0:5b88d5760320 2676 #if defined(MBEDTLS_SSL_SESSION_TICKETS)
kenjiArai 0:5b88d5760320 2677 if( ssl->handshake->new_session_ticket != 0 )
kenjiArai 0:5b88d5760320 2678 {
kenjiArai 0:5b88d5760320 2679 ssl->session_negotiate->id_len = n = 0;
kenjiArai 0:5b88d5760320 2680 memset( ssl->session_negotiate->id, 0, 32 );
kenjiArai 0:5b88d5760320 2681 }
kenjiArai 0:5b88d5760320 2682 else
kenjiArai 0:5b88d5760320 2683 #endif /* MBEDTLS_SSL_SESSION_TICKETS */
kenjiArai 0:5b88d5760320 2684 {
kenjiArai 0:5b88d5760320 2685 ssl->session_negotiate->id_len = n = 32;
kenjiArai 0:5b88d5760320 2686 if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, ssl->session_negotiate->id,
kenjiArai 0:5b88d5760320 2687 n ) ) != 0 )
kenjiArai 0:5b88d5760320 2688 return( ret );
kenjiArai 0:5b88d5760320 2689 }
kenjiArai 0:5b88d5760320 2690 }
kenjiArai 0:5b88d5760320 2691 else
kenjiArai 0:5b88d5760320 2692 {
kenjiArai 0:5b88d5760320 2693 /*
kenjiArai 0:5b88d5760320 2694 * Resuming a session
kenjiArai 0:5b88d5760320 2695 */
kenjiArai 0:5b88d5760320 2696 n = ssl->session_negotiate->id_len;
kenjiArai 0:5b88d5760320 2697 ssl->state = MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC;
kenjiArai 0:5b88d5760320 2698
kenjiArai 0:5b88d5760320 2699 if( ( ret = mbedtls_ssl_derive_keys( ssl ) ) != 0 )
kenjiArai 0:5b88d5760320 2700 {
kenjiArai 0:5b88d5760320 2701 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_derive_keys", ret );
kenjiArai 0:5b88d5760320 2702 return( ret );
kenjiArai 0:5b88d5760320 2703 }
kenjiArai 0:5b88d5760320 2704 }
kenjiArai 0:5b88d5760320 2705
kenjiArai 0:5b88d5760320 2706 /*
kenjiArai 0:5b88d5760320 2707 * 38 . 38 session id length
kenjiArai 0:5b88d5760320 2708 * 39 . 38+n session id
kenjiArai 0:5b88d5760320 2709 * 39+n . 40+n chosen ciphersuite
kenjiArai 0:5b88d5760320 2710 * 41+n . 41+n chosen compression alg.
kenjiArai 0:5b88d5760320 2711 * 42+n . 43+n extensions length
kenjiArai 0:5b88d5760320 2712 * 44+n . 43+n+m extensions
kenjiArai 0:5b88d5760320 2713 */
kenjiArai 0:5b88d5760320 2714 *p++ = (unsigned char) ssl->session_negotiate->id_len;
kenjiArai 0:5b88d5760320 2715 memcpy( p, ssl->session_negotiate->id, ssl->session_negotiate->id_len );
kenjiArai 0:5b88d5760320 2716 p += ssl->session_negotiate->id_len;
kenjiArai 0:5b88d5760320 2717
kenjiArai 0:5b88d5760320 2718 MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, session id len.: %d", n ) );
kenjiArai 0:5b88d5760320 2719 MBEDTLS_SSL_DEBUG_BUF( 3, "server hello, session id", buf + 39, n );
kenjiArai 0:5b88d5760320 2720 MBEDTLS_SSL_DEBUG_MSG( 3, ( "%s session has been resumed",
kenjiArai 0:5b88d5760320 2721 ssl->handshake->resume ? "a" : "no" ) );
kenjiArai 0:5b88d5760320 2722
kenjiArai 0:5b88d5760320 2723 *p++ = (unsigned char)( ssl->session_negotiate->ciphersuite >> 8 );
kenjiArai 0:5b88d5760320 2724 *p++ = (unsigned char)( ssl->session_negotiate->ciphersuite );
kenjiArai 0:5b88d5760320 2725 *p++ = (unsigned char)( ssl->session_negotiate->compression );
kenjiArai 0:5b88d5760320 2726
kenjiArai 0:5b88d5760320 2727 MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, chosen ciphersuite: %s",
kenjiArai 0:5b88d5760320 2728 mbedtls_ssl_get_ciphersuite_name( ssl->session_negotiate->ciphersuite ) ) );
kenjiArai 0:5b88d5760320 2729 MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, compress alg.: 0x%02X",
kenjiArai 0:5b88d5760320 2730 ssl->session_negotiate->compression ) );
kenjiArai 0:5b88d5760320 2731
kenjiArai 0:5b88d5760320 2732 /* Do not write the extensions if the protocol is SSLv3 */
kenjiArai 0:5b88d5760320 2733 #if defined(MBEDTLS_SSL_PROTO_SSL3)
kenjiArai 0:5b88d5760320 2734 if( ( ssl->major_ver != 3 ) || ( ssl->minor_ver != 0 ) )
kenjiArai 0:5b88d5760320 2735 {
kenjiArai 0:5b88d5760320 2736 #endif
kenjiArai 0:5b88d5760320 2737
kenjiArai 0:5b88d5760320 2738 /*
kenjiArai 0:5b88d5760320 2739 * First write extensions, then the total length
kenjiArai 0:5b88d5760320 2740 */
kenjiArai 0:5b88d5760320 2741 ssl_write_renegotiation_ext( ssl, p + 2 + ext_len, &olen );
kenjiArai 0:5b88d5760320 2742 ext_len += olen;
kenjiArai 0:5b88d5760320 2743
kenjiArai 0:5b88d5760320 2744 #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
kenjiArai 0:5b88d5760320 2745 ssl_write_max_fragment_length_ext( ssl, p + 2 + ext_len, &olen );
kenjiArai 0:5b88d5760320 2746 ext_len += olen;
kenjiArai 0:5b88d5760320 2747 #endif
kenjiArai 0:5b88d5760320 2748
kenjiArai 0:5b88d5760320 2749 #if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
kenjiArai 0:5b88d5760320 2750 ssl_write_truncated_hmac_ext( ssl, p + 2 + ext_len, &olen );
kenjiArai 0:5b88d5760320 2751 ext_len += olen;
kenjiArai 0:5b88d5760320 2752 #endif
kenjiArai 0:5b88d5760320 2753
kenjiArai 0:5b88d5760320 2754 #if defined(MBEDTLS_SSL_DTLS_CONNECTION_ID)
kenjiArai 0:5b88d5760320 2755 ssl_write_cid_ext( ssl, p + 2 + ext_len, &olen );
kenjiArai 0:5b88d5760320 2756 ext_len += olen;
kenjiArai 0:5b88d5760320 2757 #endif
kenjiArai 0:5b88d5760320 2758
kenjiArai 0:5b88d5760320 2759 #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
kenjiArai 0:5b88d5760320 2760 ssl_write_encrypt_then_mac_ext( ssl, p + 2 + ext_len, &olen );
kenjiArai 0:5b88d5760320 2761 ext_len += olen;
kenjiArai 0:5b88d5760320 2762 #endif
kenjiArai 0:5b88d5760320 2763
kenjiArai 0:5b88d5760320 2764 #if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
kenjiArai 0:5b88d5760320 2765 ssl_write_extended_ms_ext( ssl, p + 2 + ext_len, &olen );
kenjiArai 0:5b88d5760320 2766 ext_len += olen;
kenjiArai 0:5b88d5760320 2767 #endif
kenjiArai 0:5b88d5760320 2768
kenjiArai 0:5b88d5760320 2769 #if defined(MBEDTLS_SSL_SESSION_TICKETS)
kenjiArai 0:5b88d5760320 2770 ssl_write_session_ticket_ext( ssl, p + 2 + ext_len, &olen );
kenjiArai 0:5b88d5760320 2771 ext_len += olen;
kenjiArai 0:5b88d5760320 2772 #endif
kenjiArai 0:5b88d5760320 2773
kenjiArai 0:5b88d5760320 2774 #if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \
kenjiArai 0:5b88d5760320 2775 defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
kenjiArai 0:5b88d5760320 2776 if ( mbedtls_ssl_ciphersuite_uses_ec(
kenjiArai 0:5b88d5760320 2777 mbedtls_ssl_ciphersuite_from_id( ssl->session_negotiate->ciphersuite ) ) )
kenjiArai 0:5b88d5760320 2778 {
kenjiArai 0:5b88d5760320 2779 ssl_write_supported_point_formats_ext( ssl, p + 2 + ext_len, &olen );
kenjiArai 0:5b88d5760320 2780 ext_len += olen;
kenjiArai 0:5b88d5760320 2781 }
kenjiArai 0:5b88d5760320 2782 #endif
kenjiArai 0:5b88d5760320 2783
kenjiArai 0:5b88d5760320 2784 #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
kenjiArai 0:5b88d5760320 2785 ssl_write_ecjpake_kkpp_ext( ssl, p + 2 + ext_len, &olen );
kenjiArai 0:5b88d5760320 2786 ext_len += olen;
kenjiArai 0:5b88d5760320 2787 #endif
kenjiArai 0:5b88d5760320 2788
kenjiArai 0:5b88d5760320 2789 #if defined(MBEDTLS_SSL_ALPN)
kenjiArai 0:5b88d5760320 2790 ssl_write_alpn_ext( ssl, p + 2 + ext_len, &olen );
kenjiArai 0:5b88d5760320 2791 ext_len += olen;
kenjiArai 0:5b88d5760320 2792 #endif
kenjiArai 0:5b88d5760320 2793
kenjiArai 0:5b88d5760320 2794 MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, total extension length: %d", ext_len ) );
kenjiArai 0:5b88d5760320 2795
kenjiArai 0:5b88d5760320 2796 if( ext_len > 0 )
kenjiArai 0:5b88d5760320 2797 {
kenjiArai 0:5b88d5760320 2798 *p++ = (unsigned char)( ( ext_len >> 8 ) & 0xFF );
kenjiArai 0:5b88d5760320 2799 *p++ = (unsigned char)( ( ext_len ) & 0xFF );
kenjiArai 0:5b88d5760320 2800 p += ext_len;
kenjiArai 0:5b88d5760320 2801 }
kenjiArai 0:5b88d5760320 2802
kenjiArai 0:5b88d5760320 2803 #if defined(MBEDTLS_SSL_PROTO_SSL3)
kenjiArai 0:5b88d5760320 2804 }
kenjiArai 0:5b88d5760320 2805 #endif
kenjiArai 0:5b88d5760320 2806
kenjiArai 0:5b88d5760320 2807 ssl->out_msglen = p - buf;
kenjiArai 0:5b88d5760320 2808 ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
kenjiArai 0:5b88d5760320 2809 ssl->out_msg[0] = MBEDTLS_SSL_HS_SERVER_HELLO;
kenjiArai 0:5b88d5760320 2810
kenjiArai 0:5b88d5760320 2811 ret = mbedtls_ssl_write_handshake_msg( ssl );
kenjiArai 0:5b88d5760320 2812
kenjiArai 0:5b88d5760320 2813 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write server hello" ) );
kenjiArai 0:5b88d5760320 2814
kenjiArai 0:5b88d5760320 2815 return( ret );
kenjiArai 0:5b88d5760320 2816 }
kenjiArai 0:5b88d5760320 2817
kenjiArai 0:5b88d5760320 2818 #if !defined(MBEDTLS_KEY_EXCHANGE__CERT_REQ_ALLOWED__ENABLED)
kenjiArai 0:5b88d5760320 2819 static int ssl_write_certificate_request( mbedtls_ssl_context *ssl )
kenjiArai 0:5b88d5760320 2820 {
kenjiArai 0:5b88d5760320 2821 const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
kenjiArai 0:5b88d5760320 2822 ssl->handshake->ciphersuite_info;
kenjiArai 0:5b88d5760320 2823
kenjiArai 0:5b88d5760320 2824 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate request" ) );
kenjiArai 0:5b88d5760320 2825
kenjiArai 0:5b88d5760320 2826 if( !mbedtls_ssl_ciphersuite_cert_req_allowed( ciphersuite_info ) )
kenjiArai 0:5b88d5760320 2827 {
kenjiArai 0:5b88d5760320 2828 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate request" ) );
kenjiArai 0:5b88d5760320 2829 ssl->state++;
kenjiArai 0:5b88d5760320 2830 return( 0 );
kenjiArai 0:5b88d5760320 2831 }
kenjiArai 0:5b88d5760320 2832
kenjiArai 0:5b88d5760320 2833 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
kenjiArai 0:5b88d5760320 2834 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
kenjiArai 0:5b88d5760320 2835 }
kenjiArai 0:5b88d5760320 2836 #else /* !MBEDTLS_KEY_EXCHANGE__CERT_REQ_ALLOWED__ENABLED */
kenjiArai 0:5b88d5760320 2837 static int ssl_write_certificate_request( mbedtls_ssl_context *ssl )
kenjiArai 0:5b88d5760320 2838 {
kenjiArai 0:5b88d5760320 2839 int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
kenjiArai 0:5b88d5760320 2840 const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
kenjiArai 0:5b88d5760320 2841 ssl->handshake->ciphersuite_info;
kenjiArai 0:5b88d5760320 2842 size_t dn_size, total_dn_size; /* excluding length bytes */
kenjiArai 0:5b88d5760320 2843 size_t ct_len, sa_len; /* including length bytes */
kenjiArai 0:5b88d5760320 2844 unsigned char *buf, *p;
kenjiArai 0:5b88d5760320 2845 const unsigned char * const end = ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN;
kenjiArai 0:5b88d5760320 2846 const mbedtls_x509_crt *crt;
kenjiArai 0:5b88d5760320 2847 int authmode;
kenjiArai 0:5b88d5760320 2848
kenjiArai 0:5b88d5760320 2849 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate request" ) );
kenjiArai 0:5b88d5760320 2850
kenjiArai 0:5b88d5760320 2851 ssl->state++;
kenjiArai 0:5b88d5760320 2852
kenjiArai 0:5b88d5760320 2853 #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
kenjiArai 0:5b88d5760320 2854 if( ssl->handshake->sni_authmode != MBEDTLS_SSL_VERIFY_UNSET )
kenjiArai 0:5b88d5760320 2855 authmode = ssl->handshake->sni_authmode;
kenjiArai 0:5b88d5760320 2856 else
kenjiArai 0:5b88d5760320 2857 #endif
kenjiArai 0:5b88d5760320 2858 authmode = ssl->conf->authmode;
kenjiArai 0:5b88d5760320 2859
kenjiArai 0:5b88d5760320 2860 if( !mbedtls_ssl_ciphersuite_cert_req_allowed( ciphersuite_info ) ||
kenjiArai 0:5b88d5760320 2861 authmode == MBEDTLS_SSL_VERIFY_NONE )
kenjiArai 0:5b88d5760320 2862 {
kenjiArai 0:5b88d5760320 2863 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate request" ) );
kenjiArai 0:5b88d5760320 2864 return( 0 );
kenjiArai 0:5b88d5760320 2865 }
kenjiArai 0:5b88d5760320 2866
kenjiArai 0:5b88d5760320 2867 /*
kenjiArai 0:5b88d5760320 2868 * 0 . 0 handshake type
kenjiArai 0:5b88d5760320 2869 * 1 . 3 handshake length
kenjiArai 0:5b88d5760320 2870 * 4 . 4 cert type count
kenjiArai 0:5b88d5760320 2871 * 5 .. m-1 cert types
kenjiArai 0:5b88d5760320 2872 * m .. m+1 sig alg length (TLS 1.2 only)
kenjiArai 0:5b88d5760320 2873 * m+1 .. n-1 SignatureAndHashAlgorithms (TLS 1.2 only)
kenjiArai 0:5b88d5760320 2874 * n .. n+1 length of all DNs
kenjiArai 0:5b88d5760320 2875 * n+2 .. n+3 length of DN 1
kenjiArai 0:5b88d5760320 2876 * n+4 .. ... Distinguished Name #1
kenjiArai 0:5b88d5760320 2877 * ... .. ... length of DN 2, etc.
kenjiArai 0:5b88d5760320 2878 */
kenjiArai 0:5b88d5760320 2879 buf = ssl->out_msg;
kenjiArai 0:5b88d5760320 2880 p = buf + 4;
kenjiArai 0:5b88d5760320 2881
kenjiArai 0:5b88d5760320 2882 /*
kenjiArai 0:5b88d5760320 2883 * Supported certificate types
kenjiArai 0:5b88d5760320 2884 *
kenjiArai 0:5b88d5760320 2885 * ClientCertificateType certificate_types<1..2^8-1>;
kenjiArai 0:5b88d5760320 2886 * enum { (255) } ClientCertificateType;
kenjiArai 0:5b88d5760320 2887 */
kenjiArai 0:5b88d5760320 2888 ct_len = 0;
kenjiArai 0:5b88d5760320 2889
kenjiArai 0:5b88d5760320 2890 #if defined(MBEDTLS_RSA_C)
kenjiArai 0:5b88d5760320 2891 p[1 + ct_len++] = MBEDTLS_SSL_CERT_TYPE_RSA_SIGN;
kenjiArai 0:5b88d5760320 2892 #endif
kenjiArai 0:5b88d5760320 2893 #if defined(MBEDTLS_ECDSA_C)
kenjiArai 0:5b88d5760320 2894 p[1 + ct_len++] = MBEDTLS_SSL_CERT_TYPE_ECDSA_SIGN;
kenjiArai 0:5b88d5760320 2895 #endif
kenjiArai 0:5b88d5760320 2896
kenjiArai 0:5b88d5760320 2897 p[0] = (unsigned char) ct_len++;
kenjiArai 0:5b88d5760320 2898 p += ct_len;
kenjiArai 0:5b88d5760320 2899
kenjiArai 0:5b88d5760320 2900 sa_len = 0;
kenjiArai 0:5b88d5760320 2901 #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
kenjiArai 0:5b88d5760320 2902 /*
kenjiArai 0:5b88d5760320 2903 * Add signature_algorithms for verify (TLS 1.2)
kenjiArai 0:5b88d5760320 2904 *
kenjiArai 0:5b88d5760320 2905 * SignatureAndHashAlgorithm supported_signature_algorithms<2..2^16-2>;
kenjiArai 0:5b88d5760320 2906 *
kenjiArai 0:5b88d5760320 2907 * struct {
kenjiArai 0:5b88d5760320 2908 * HashAlgorithm hash;
kenjiArai 0:5b88d5760320 2909 * SignatureAlgorithm signature;
kenjiArai 0:5b88d5760320 2910 * } SignatureAndHashAlgorithm;
kenjiArai 0:5b88d5760320 2911 *
kenjiArai 0:5b88d5760320 2912 * enum { (255) } HashAlgorithm;
kenjiArai 0:5b88d5760320 2913 * enum { (255) } SignatureAlgorithm;
kenjiArai 0:5b88d5760320 2914 */
kenjiArai 0:5b88d5760320 2915 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
kenjiArai 0:5b88d5760320 2916 {
kenjiArai 0:5b88d5760320 2917 const int *cur;
kenjiArai 0:5b88d5760320 2918
kenjiArai 0:5b88d5760320 2919 /*
kenjiArai 0:5b88d5760320 2920 * Supported signature algorithms
kenjiArai 0:5b88d5760320 2921 */
kenjiArai 0:5b88d5760320 2922 for( cur = ssl->conf->sig_hashes; *cur != MBEDTLS_MD_NONE; cur++ )
kenjiArai 0:5b88d5760320 2923 {
kenjiArai 0:5b88d5760320 2924 unsigned char hash = mbedtls_ssl_hash_from_md_alg( *cur );
kenjiArai 0:5b88d5760320 2925
kenjiArai 0:5b88d5760320 2926 if( MBEDTLS_SSL_HASH_NONE == hash || mbedtls_ssl_set_calc_verify_md( ssl, hash ) )
kenjiArai 0:5b88d5760320 2927 continue;
kenjiArai 0:5b88d5760320 2928
kenjiArai 0:5b88d5760320 2929 #if defined(MBEDTLS_RSA_C)
kenjiArai 0:5b88d5760320 2930 p[2 + sa_len++] = hash;
kenjiArai 0:5b88d5760320 2931 p[2 + sa_len++] = MBEDTLS_SSL_SIG_RSA;
kenjiArai 0:5b88d5760320 2932 #endif
kenjiArai 0:5b88d5760320 2933 #if defined(MBEDTLS_ECDSA_C)
kenjiArai 0:5b88d5760320 2934 p[2 + sa_len++] = hash;
kenjiArai 0:5b88d5760320 2935 p[2 + sa_len++] = MBEDTLS_SSL_SIG_ECDSA;
kenjiArai 0:5b88d5760320 2936 #endif
kenjiArai 0:5b88d5760320 2937 }
kenjiArai 0:5b88d5760320 2938
kenjiArai 0:5b88d5760320 2939 p[0] = (unsigned char)( sa_len >> 8 );
kenjiArai 0:5b88d5760320 2940 p[1] = (unsigned char)( sa_len );
kenjiArai 0:5b88d5760320 2941 sa_len += 2;
kenjiArai 0:5b88d5760320 2942 p += sa_len;
kenjiArai 0:5b88d5760320 2943 }
kenjiArai 0:5b88d5760320 2944 #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
kenjiArai 0:5b88d5760320 2945
kenjiArai 0:5b88d5760320 2946 /*
kenjiArai 0:5b88d5760320 2947 * DistinguishedName certificate_authorities<0..2^16-1>;
kenjiArai 0:5b88d5760320 2948 * opaque DistinguishedName<1..2^16-1>;
kenjiArai 0:5b88d5760320 2949 */
kenjiArai 0:5b88d5760320 2950 p += 2;
kenjiArai 0:5b88d5760320 2951
kenjiArai 0:5b88d5760320 2952 total_dn_size = 0;
kenjiArai 0:5b88d5760320 2953
kenjiArai 0:5b88d5760320 2954 if( ssl->conf->cert_req_ca_list == MBEDTLS_SSL_CERT_REQ_CA_LIST_ENABLED )
kenjiArai 0:5b88d5760320 2955 {
kenjiArai 0:5b88d5760320 2956 /* NOTE: If trusted certificates are provisioned
kenjiArai 0:5b88d5760320 2957 * via a CA callback (configured through
kenjiArai 0:5b88d5760320 2958 * `mbedtls_ssl_conf_ca_cb()`, then the
kenjiArai 0:5b88d5760320 2959 * CertificateRequest is currently left empty. */
kenjiArai 0:5b88d5760320 2960
kenjiArai 0:5b88d5760320 2961 #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
kenjiArai 0:5b88d5760320 2962 if( ssl->handshake->sni_ca_chain != NULL )
kenjiArai 0:5b88d5760320 2963 crt = ssl->handshake->sni_ca_chain;
kenjiArai 0:5b88d5760320 2964 else
kenjiArai 0:5b88d5760320 2965 #endif
kenjiArai 0:5b88d5760320 2966 crt = ssl->conf->ca_chain;
kenjiArai 0:5b88d5760320 2967
kenjiArai 0:5b88d5760320 2968 while( crt != NULL && crt->version != 0 )
kenjiArai 0:5b88d5760320 2969 {
kenjiArai 0:5b88d5760320 2970 dn_size = crt->subject_raw.len;
kenjiArai 0:5b88d5760320 2971
kenjiArai 0:5b88d5760320 2972 if( end < p ||
kenjiArai 0:5b88d5760320 2973 (size_t)( end - p ) < dn_size ||
kenjiArai 0:5b88d5760320 2974 (size_t)( end - p ) < 2 + dn_size )
kenjiArai 0:5b88d5760320 2975 {
kenjiArai 0:5b88d5760320 2976 MBEDTLS_SSL_DEBUG_MSG( 1, ( "skipping CAs: buffer too short" ) );
kenjiArai 0:5b88d5760320 2977 break;
kenjiArai 0:5b88d5760320 2978 }
kenjiArai 0:5b88d5760320 2979
kenjiArai 0:5b88d5760320 2980 *p++ = (unsigned char)( dn_size >> 8 );
kenjiArai 0:5b88d5760320 2981 *p++ = (unsigned char)( dn_size );
kenjiArai 0:5b88d5760320 2982 memcpy( p, crt->subject_raw.p, dn_size );
kenjiArai 0:5b88d5760320 2983 p += dn_size;
kenjiArai 0:5b88d5760320 2984
kenjiArai 0:5b88d5760320 2985 MBEDTLS_SSL_DEBUG_BUF( 3, "requested DN", p - dn_size, dn_size );
kenjiArai 0:5b88d5760320 2986
kenjiArai 0:5b88d5760320 2987 total_dn_size += 2 + dn_size;
kenjiArai 0:5b88d5760320 2988 crt = crt->next;
kenjiArai 0:5b88d5760320 2989 }
kenjiArai 0:5b88d5760320 2990 }
kenjiArai 0:5b88d5760320 2991
kenjiArai 0:5b88d5760320 2992 ssl->out_msglen = p - buf;
kenjiArai 0:5b88d5760320 2993 ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
kenjiArai 0:5b88d5760320 2994 ssl->out_msg[0] = MBEDTLS_SSL_HS_CERTIFICATE_REQUEST;
kenjiArai 0:5b88d5760320 2995 ssl->out_msg[4 + ct_len + sa_len] = (unsigned char)( total_dn_size >> 8 );
kenjiArai 0:5b88d5760320 2996 ssl->out_msg[5 + ct_len + sa_len] = (unsigned char)( total_dn_size );
kenjiArai 0:5b88d5760320 2997
kenjiArai 0:5b88d5760320 2998 ret = mbedtls_ssl_write_handshake_msg( ssl );
kenjiArai 0:5b88d5760320 2999
kenjiArai 0:5b88d5760320 3000 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write certificate request" ) );
kenjiArai 0:5b88d5760320 3001
kenjiArai 0:5b88d5760320 3002 return( ret );
kenjiArai 0:5b88d5760320 3003 }
kenjiArai 0:5b88d5760320 3004 #endif /* MBEDTLS_KEY_EXCHANGE__CERT_REQ_ALLOWED__ENABLED */
kenjiArai 0:5b88d5760320 3005
kenjiArai 0:5b88d5760320 3006 #if defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || \
kenjiArai 0:5b88d5760320 3007 defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)
kenjiArai 0:5b88d5760320 3008 static int ssl_get_ecdh_params_from_cert( mbedtls_ssl_context *ssl )
kenjiArai 0:5b88d5760320 3009 {
kenjiArai 0:5b88d5760320 3010 int ret;
kenjiArai 0:5b88d5760320 3011
kenjiArai 0:5b88d5760320 3012 if( ! mbedtls_pk_can_do( mbedtls_ssl_own_key( ssl ), MBEDTLS_PK_ECKEY ) )
kenjiArai 0:5b88d5760320 3013 {
kenjiArai 0:5b88d5760320 3014 MBEDTLS_SSL_DEBUG_MSG( 1, ( "server key not ECDH capable" ) );
kenjiArai 0:5b88d5760320 3015 return( MBEDTLS_ERR_SSL_PK_TYPE_MISMATCH );
kenjiArai 0:5b88d5760320 3016 }
kenjiArai 0:5b88d5760320 3017
kenjiArai 0:5b88d5760320 3018 if( ( ret = mbedtls_ecdh_get_params( &ssl->handshake->ecdh_ctx,
kenjiArai 0:5b88d5760320 3019 mbedtls_pk_ec( *mbedtls_ssl_own_key( ssl ) ),
kenjiArai 0:5b88d5760320 3020 MBEDTLS_ECDH_OURS ) ) != 0 )
kenjiArai 0:5b88d5760320 3021 {
kenjiArai 0:5b88d5760320 3022 MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ecdh_get_params" ), ret );
kenjiArai 0:5b88d5760320 3023 return( ret );
kenjiArai 0:5b88d5760320 3024 }
kenjiArai 0:5b88d5760320 3025
kenjiArai 0:5b88d5760320 3026 return( 0 );
kenjiArai 0:5b88d5760320 3027 }
kenjiArai 0:5b88d5760320 3028 #endif /* MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) ||
kenjiArai 0:5b88d5760320 3029 MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */
kenjiArai 0:5b88d5760320 3030
kenjiArai 0:5b88d5760320 3031 #if defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED) && \
kenjiArai 0:5b88d5760320 3032 defined(MBEDTLS_SSL_ASYNC_PRIVATE)
kenjiArai 0:5b88d5760320 3033 static int ssl_resume_server_key_exchange( mbedtls_ssl_context *ssl,
kenjiArai 0:5b88d5760320 3034 size_t *signature_len )
kenjiArai 0:5b88d5760320 3035 {
kenjiArai 0:5b88d5760320 3036 /* Append the signature to ssl->out_msg, leaving 2 bytes for the
kenjiArai 0:5b88d5760320 3037 * signature length which will be added in ssl_write_server_key_exchange
kenjiArai 0:5b88d5760320 3038 * after the call to ssl_prepare_server_key_exchange.
kenjiArai 0:5b88d5760320 3039 * ssl_write_server_key_exchange also takes care of incrementing
kenjiArai 0:5b88d5760320 3040 * ssl->out_msglen. */
kenjiArai 0:5b88d5760320 3041 unsigned char *sig_start = ssl->out_msg + ssl->out_msglen + 2;
kenjiArai 0:5b88d5760320 3042 size_t sig_max_len = ( ssl->out_buf + MBEDTLS_SSL_OUT_CONTENT_LEN
kenjiArai 0:5b88d5760320 3043 - sig_start );
kenjiArai 0:5b88d5760320 3044 int ret = ssl->conf->f_async_resume( ssl,
kenjiArai 0:5b88d5760320 3045 sig_start, signature_len, sig_max_len );
kenjiArai 0:5b88d5760320 3046 if( ret != MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS )
kenjiArai 0:5b88d5760320 3047 {
kenjiArai 0:5b88d5760320 3048 ssl->handshake->async_in_progress = 0;
kenjiArai 0:5b88d5760320 3049 mbedtls_ssl_set_async_operation_data( ssl, NULL );
kenjiArai 0:5b88d5760320 3050 }
kenjiArai 0:5b88d5760320 3051 MBEDTLS_SSL_DEBUG_RET( 2, "ssl_resume_server_key_exchange", ret );
kenjiArai 0:5b88d5760320 3052 return( ret );
kenjiArai 0:5b88d5760320 3053 }
kenjiArai 0:5b88d5760320 3054 #endif /* defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED) &&
kenjiArai 0:5b88d5760320 3055 defined(MBEDTLS_SSL_ASYNC_PRIVATE) */
kenjiArai 0:5b88d5760320 3056
kenjiArai 0:5b88d5760320 3057 /* Prepare the ServerKeyExchange message, up to and including
kenjiArai 0:5b88d5760320 3058 * calculating the signature if any, but excluding formatting the
kenjiArai 0:5b88d5760320 3059 * signature and sending the message. */
kenjiArai 0:5b88d5760320 3060 static int ssl_prepare_server_key_exchange( mbedtls_ssl_context *ssl,
kenjiArai 0:5b88d5760320 3061 size_t *signature_len )
kenjiArai 0:5b88d5760320 3062 {
kenjiArai 0:5b88d5760320 3063 const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
kenjiArai 0:5b88d5760320 3064 ssl->handshake->ciphersuite_info;
kenjiArai 0:5b88d5760320 3065
kenjiArai 0:5b88d5760320 3066 #if defined(MBEDTLS_KEY_EXCHANGE__SOME_PFS__ENABLED)
kenjiArai 0:5b88d5760320 3067 #if defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED)
kenjiArai 0:5b88d5760320 3068 unsigned char *dig_signed = NULL;
kenjiArai 0:5b88d5760320 3069 #endif /* MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED */
kenjiArai 0:5b88d5760320 3070 #endif /* MBEDTLS_KEY_EXCHANGE__SOME_PFS__ENABLED */
kenjiArai 0:5b88d5760320 3071
kenjiArai 0:5b88d5760320 3072 (void) ciphersuite_info; /* unused in some configurations */
kenjiArai 0:5b88d5760320 3073 #if !defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED)
kenjiArai 0:5b88d5760320 3074 (void) signature_len;
kenjiArai 0:5b88d5760320 3075 #endif /* MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED */
kenjiArai 0:5b88d5760320 3076
kenjiArai 0:5b88d5760320 3077 ssl->out_msglen = 4; /* header (type:1, length:3) to be written later */
kenjiArai 0:5b88d5760320 3078
kenjiArai 0:5b88d5760320 3079 /*
kenjiArai 0:5b88d5760320 3080 *
kenjiArai 0:5b88d5760320 3081 * Part 1: Provide key exchange parameters for chosen ciphersuite.
kenjiArai 0:5b88d5760320 3082 *
kenjiArai 0:5b88d5760320 3083 */
kenjiArai 0:5b88d5760320 3084
kenjiArai 0:5b88d5760320 3085 /*
kenjiArai 0:5b88d5760320 3086 * - ECJPAKE key exchanges
kenjiArai 0:5b88d5760320 3087 */
kenjiArai 0:5b88d5760320 3088 #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
kenjiArai 0:5b88d5760320 3089 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
kenjiArai 0:5b88d5760320 3090 {
kenjiArai 0:5b88d5760320 3091 int ret;
kenjiArai 0:5b88d5760320 3092 size_t len = 0;
kenjiArai 0:5b88d5760320 3093
kenjiArai 0:5b88d5760320 3094 ret = mbedtls_ecjpake_write_round_two(
kenjiArai 0:5b88d5760320 3095 &ssl->handshake->ecjpake_ctx,
kenjiArai 0:5b88d5760320 3096 ssl->out_msg + ssl->out_msglen,
kenjiArai 0:5b88d5760320 3097 MBEDTLS_SSL_OUT_CONTENT_LEN - ssl->out_msglen, &len,
kenjiArai 0:5b88d5760320 3098 ssl->conf->f_rng, ssl->conf->p_rng );
kenjiArai 0:5b88d5760320 3099 if( ret != 0 )
kenjiArai 0:5b88d5760320 3100 {
kenjiArai 0:5b88d5760320 3101 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_write_round_two", ret );
kenjiArai 0:5b88d5760320 3102 return( ret );
kenjiArai 0:5b88d5760320 3103 }
kenjiArai 0:5b88d5760320 3104
kenjiArai 0:5b88d5760320 3105 ssl->out_msglen += len;
kenjiArai 0:5b88d5760320 3106 }
kenjiArai 0:5b88d5760320 3107 #endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
kenjiArai 0:5b88d5760320 3108
kenjiArai 0:5b88d5760320 3109 /*
kenjiArai 0:5b88d5760320 3110 * For (EC)DHE key exchanges with PSK, parameters are prefixed by support
kenjiArai 0:5b88d5760320 3111 * identity hint (RFC 4279, Sec. 3). Until someone needs this feature,
kenjiArai 0:5b88d5760320 3112 * we use empty support identity hints here.
kenjiArai 0:5b88d5760320 3113 **/
kenjiArai 0:5b88d5760320 3114 #if defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED) || \
kenjiArai 0:5b88d5760320 3115 defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
kenjiArai 0:5b88d5760320 3116 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK ||
kenjiArai 0:5b88d5760320 3117 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK )
kenjiArai 0:5b88d5760320 3118 {
kenjiArai 0:5b88d5760320 3119 ssl->out_msg[ssl->out_msglen++] = 0x00;
kenjiArai 0:5b88d5760320 3120 ssl->out_msg[ssl->out_msglen++] = 0x00;
kenjiArai 0:5b88d5760320 3121 }
kenjiArai 0:5b88d5760320 3122 #endif /* MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED ||
kenjiArai 0:5b88d5760320 3123 MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */
kenjiArai 0:5b88d5760320 3124
kenjiArai 0:5b88d5760320 3125 /*
kenjiArai 0:5b88d5760320 3126 * - DHE key exchanges
kenjiArai 0:5b88d5760320 3127 */
kenjiArai 0:5b88d5760320 3128 #if defined(MBEDTLS_KEY_EXCHANGE__SOME__DHE_ENABLED)
kenjiArai 0:5b88d5760320 3129 if( mbedtls_ssl_ciphersuite_uses_dhe( ciphersuite_info ) )
kenjiArai 0:5b88d5760320 3130 {
kenjiArai 0:5b88d5760320 3131 int ret;
kenjiArai 0:5b88d5760320 3132 size_t len = 0;
kenjiArai 0:5b88d5760320 3133
kenjiArai 0:5b88d5760320 3134 if( ssl->conf->dhm_P.p == NULL || ssl->conf->dhm_G.p == NULL )
kenjiArai 0:5b88d5760320 3135 {
kenjiArai 0:5b88d5760320 3136 MBEDTLS_SSL_DEBUG_MSG( 1, ( "no DH parameters set" ) );
kenjiArai 0:5b88d5760320 3137 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
kenjiArai 0:5b88d5760320 3138 }
kenjiArai 0:5b88d5760320 3139
kenjiArai 0:5b88d5760320 3140 /*
kenjiArai 0:5b88d5760320 3141 * Ephemeral DH parameters:
kenjiArai 0:5b88d5760320 3142 *
kenjiArai 0:5b88d5760320 3143 * struct {
kenjiArai 0:5b88d5760320 3144 * opaque dh_p<1..2^16-1>;
kenjiArai 0:5b88d5760320 3145 * opaque dh_g<1..2^16-1>;
kenjiArai 0:5b88d5760320 3146 * opaque dh_Ys<1..2^16-1>;
kenjiArai 0:5b88d5760320 3147 * } ServerDHParams;
kenjiArai 0:5b88d5760320 3148 */
kenjiArai 0:5b88d5760320 3149 if( ( ret = mbedtls_dhm_set_group( &ssl->handshake->dhm_ctx,
kenjiArai 0:5b88d5760320 3150 &ssl->conf->dhm_P,
kenjiArai 0:5b88d5760320 3151 &ssl->conf->dhm_G ) ) != 0 )
kenjiArai 0:5b88d5760320 3152 {
kenjiArai 0:5b88d5760320 3153 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_set_group", ret );
kenjiArai 0:5b88d5760320 3154 return( ret );
kenjiArai 0:5b88d5760320 3155 }
kenjiArai 0:5b88d5760320 3156
kenjiArai 0:5b88d5760320 3157 if( ( ret = mbedtls_dhm_make_params(
kenjiArai 0:5b88d5760320 3158 &ssl->handshake->dhm_ctx,
kenjiArai 0:5b88d5760320 3159 (int) mbedtls_mpi_size( &ssl->handshake->dhm_ctx.P ),
kenjiArai 0:5b88d5760320 3160 ssl->out_msg + ssl->out_msglen, &len,
kenjiArai 0:5b88d5760320 3161 ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
kenjiArai 0:5b88d5760320 3162 {
kenjiArai 0:5b88d5760320 3163 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_make_params", ret );
kenjiArai 0:5b88d5760320 3164 return( ret );
kenjiArai 0:5b88d5760320 3165 }
kenjiArai 0:5b88d5760320 3166
kenjiArai 0:5b88d5760320 3167 #if defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED)
kenjiArai 0:5b88d5760320 3168 dig_signed = ssl->out_msg + ssl->out_msglen;
kenjiArai 0:5b88d5760320 3169 #endif
kenjiArai 0:5b88d5760320 3170
kenjiArai 0:5b88d5760320 3171 ssl->out_msglen += len;
kenjiArai 0:5b88d5760320 3172
kenjiArai 0:5b88d5760320 3173 MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: X ", &ssl->handshake->dhm_ctx.X );
kenjiArai 0:5b88d5760320 3174 MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: P ", &ssl->handshake->dhm_ctx.P );
kenjiArai 0:5b88d5760320 3175 MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: G ", &ssl->handshake->dhm_ctx.G );
kenjiArai 0:5b88d5760320 3176 MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: GX", &ssl->handshake->dhm_ctx.GX );
kenjiArai 0:5b88d5760320 3177 }
kenjiArai 0:5b88d5760320 3178 #endif /* MBEDTLS_KEY_EXCHANGE__SOME__DHE_ENABLED */
kenjiArai 0:5b88d5760320 3179
kenjiArai 0:5b88d5760320 3180 /*
kenjiArai 0:5b88d5760320 3181 * - ECDHE key exchanges
kenjiArai 0:5b88d5760320 3182 */
kenjiArai 0:5b88d5760320 3183 #if defined(MBEDTLS_KEY_EXCHANGE__SOME__ECDHE_ENABLED)
kenjiArai 0:5b88d5760320 3184 if( mbedtls_ssl_ciphersuite_uses_ecdhe( ciphersuite_info ) )
kenjiArai 0:5b88d5760320 3185 {
kenjiArai 0:5b88d5760320 3186 /*
kenjiArai 0:5b88d5760320 3187 * Ephemeral ECDH parameters:
kenjiArai 0:5b88d5760320 3188 *
kenjiArai 0:5b88d5760320 3189 * struct {
kenjiArai 0:5b88d5760320 3190 * ECParameters curve_params;
kenjiArai 0:5b88d5760320 3191 * ECPoint public;
kenjiArai 0:5b88d5760320 3192 * } ServerECDHParams;
kenjiArai 0:5b88d5760320 3193 */
kenjiArai 0:5b88d5760320 3194 const mbedtls_ecp_curve_info **curve = NULL;
kenjiArai 0:5b88d5760320 3195 const mbedtls_ecp_group_id *gid;
kenjiArai 0:5b88d5760320 3196 int ret;
kenjiArai 0:5b88d5760320 3197 size_t len = 0;
kenjiArai 0:5b88d5760320 3198
kenjiArai 0:5b88d5760320 3199 /* Match our preference list against the offered curves */
kenjiArai 0:5b88d5760320 3200 for( gid = ssl->conf->curve_list; *gid != MBEDTLS_ECP_DP_NONE; gid++ )
kenjiArai 0:5b88d5760320 3201 for( curve = ssl->handshake->curves; *curve != NULL; curve++ )
kenjiArai 0:5b88d5760320 3202 if( (*curve)->grp_id == *gid )
kenjiArai 0:5b88d5760320 3203 goto curve_matching_done;
kenjiArai 0:5b88d5760320 3204
kenjiArai 0:5b88d5760320 3205 curve_matching_done:
kenjiArai 0:5b88d5760320 3206 if( curve == NULL || *curve == NULL )
kenjiArai 0:5b88d5760320 3207 {
kenjiArai 0:5b88d5760320 3208 MBEDTLS_SSL_DEBUG_MSG( 1, ( "no matching curve for ECDHE" ) );
kenjiArai 0:5b88d5760320 3209 return( MBEDTLS_ERR_SSL_NO_CIPHER_CHOSEN );
kenjiArai 0:5b88d5760320 3210 }
kenjiArai 0:5b88d5760320 3211
kenjiArai 0:5b88d5760320 3212 MBEDTLS_SSL_DEBUG_MSG( 2, ( "ECDHE curve: %s", (*curve)->name ) );
kenjiArai 0:5b88d5760320 3213
kenjiArai 0:5b88d5760320 3214 if( ( ret = mbedtls_ecdh_setup( &ssl->handshake->ecdh_ctx,
kenjiArai 0:5b88d5760320 3215 (*curve)->grp_id ) ) != 0 )
kenjiArai 0:5b88d5760320 3216 {
kenjiArai 0:5b88d5760320 3217 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecp_group_load", ret );
kenjiArai 0:5b88d5760320 3218 return( ret );
kenjiArai 0:5b88d5760320 3219 }
kenjiArai 0:5b88d5760320 3220
kenjiArai 0:5b88d5760320 3221 if( ( ret = mbedtls_ecdh_make_params(
kenjiArai 0:5b88d5760320 3222 &ssl->handshake->ecdh_ctx, &len,
kenjiArai 0:5b88d5760320 3223 ssl->out_msg + ssl->out_msglen,
kenjiArai 0:5b88d5760320 3224 MBEDTLS_SSL_OUT_CONTENT_LEN - ssl->out_msglen,
kenjiArai 0:5b88d5760320 3225 ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
kenjiArai 0:5b88d5760320 3226 {
kenjiArai 0:5b88d5760320 3227 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_make_params", ret );
kenjiArai 0:5b88d5760320 3228 return( ret );
kenjiArai 0:5b88d5760320 3229 }
kenjiArai 0:5b88d5760320 3230
kenjiArai 0:5b88d5760320 3231 #if defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED)
kenjiArai 0:5b88d5760320 3232 dig_signed = ssl->out_msg + ssl->out_msglen;
kenjiArai 0:5b88d5760320 3233 #endif
kenjiArai 0:5b88d5760320 3234
kenjiArai 0:5b88d5760320 3235 ssl->out_msglen += len;
kenjiArai 0:5b88d5760320 3236
kenjiArai 0:5b88d5760320 3237 MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx,
kenjiArai 0:5b88d5760320 3238 MBEDTLS_DEBUG_ECDH_Q );
kenjiArai 0:5b88d5760320 3239 }
kenjiArai 0:5b88d5760320 3240 #endif /* MBEDTLS_KEY_EXCHANGE__SOME__ECDHE_ENABLED */
kenjiArai 0:5b88d5760320 3241
kenjiArai 0:5b88d5760320 3242 /*
kenjiArai 0:5b88d5760320 3243 *
kenjiArai 0:5b88d5760320 3244 * Part 2: For key exchanges involving the server signing the
kenjiArai 0:5b88d5760320 3245 * exchange parameters, compute and add the signature here.
kenjiArai 0:5b88d5760320 3246 *
kenjiArai 0:5b88d5760320 3247 */
kenjiArai 0:5b88d5760320 3248 #if defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED)
kenjiArai 0:5b88d5760320 3249 if( mbedtls_ssl_ciphersuite_uses_server_signature( ciphersuite_info ) )
kenjiArai 0:5b88d5760320 3250 {
kenjiArai 0:5b88d5760320 3251 size_t dig_signed_len = ssl->out_msg + ssl->out_msglen - dig_signed;
kenjiArai 0:5b88d5760320 3252 size_t hashlen = 0;
kenjiArai 0:5b88d5760320 3253 unsigned char hash[MBEDTLS_MD_MAX_SIZE];
kenjiArai 0:5b88d5760320 3254 int ret;
kenjiArai 0:5b88d5760320 3255
kenjiArai 0:5b88d5760320 3256 /*
kenjiArai 0:5b88d5760320 3257 * 2.1: Choose hash algorithm:
kenjiArai 0:5b88d5760320 3258 * A: For TLS 1.2, obey signature-hash-algorithm extension
kenjiArai 0:5b88d5760320 3259 * to choose appropriate hash.
kenjiArai 0:5b88d5760320 3260 * B: For SSL3, TLS1.0, TLS1.1 and ECDHE_ECDSA, use SHA1
kenjiArai 0:5b88d5760320 3261 * (RFC 4492, Sec. 5.4)
kenjiArai 0:5b88d5760320 3262 * C: Otherwise, use MD5 + SHA1 (RFC 4346, Sec. 7.4.3)
kenjiArai 0:5b88d5760320 3263 */
kenjiArai 0:5b88d5760320 3264
kenjiArai 0:5b88d5760320 3265 mbedtls_md_type_t md_alg;
kenjiArai 0:5b88d5760320 3266
kenjiArai 0:5b88d5760320 3267 #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
kenjiArai 0:5b88d5760320 3268 mbedtls_pk_type_t sig_alg =
kenjiArai 0:5b88d5760320 3269 mbedtls_ssl_get_ciphersuite_sig_pk_alg( ciphersuite_info );
kenjiArai 0:5b88d5760320 3270 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
kenjiArai 0:5b88d5760320 3271 {
kenjiArai 0:5b88d5760320 3272 /* A: For TLS 1.2, obey signature-hash-algorithm extension
kenjiArai 0:5b88d5760320 3273 * (RFC 5246, Sec. 7.4.1.4.1). */
kenjiArai 0:5b88d5760320 3274 if( sig_alg == MBEDTLS_PK_NONE ||
kenjiArai 0:5b88d5760320 3275 ( md_alg = mbedtls_ssl_sig_hash_set_find( &ssl->handshake->hash_algs,
kenjiArai 0:5b88d5760320 3276 sig_alg ) ) == MBEDTLS_MD_NONE )
kenjiArai 0:5b88d5760320 3277 {
kenjiArai 0:5b88d5760320 3278 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
kenjiArai 0:5b88d5760320 3279 /* (... because we choose a cipher suite
kenjiArai 0:5b88d5760320 3280 * only if there is a matching hash.) */
kenjiArai 0:5b88d5760320 3281 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
kenjiArai 0:5b88d5760320 3282 }
kenjiArai 0:5b88d5760320 3283 }
kenjiArai 0:5b88d5760320 3284 else
kenjiArai 0:5b88d5760320 3285 #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
kenjiArai 0:5b88d5760320 3286 #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
kenjiArai 0:5b88d5760320 3287 defined(MBEDTLS_SSL_PROTO_TLS1_1)
kenjiArai 0:5b88d5760320 3288 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA )
kenjiArai 0:5b88d5760320 3289 {
kenjiArai 0:5b88d5760320 3290 /* B: Default hash SHA1 */
kenjiArai 0:5b88d5760320 3291 md_alg = MBEDTLS_MD_SHA1;
kenjiArai 0:5b88d5760320 3292 }
kenjiArai 0:5b88d5760320 3293 else
kenjiArai 0:5b88d5760320 3294 #endif /* MBEDTLS_SSL_PROTO_SSL3 || MBEDTLS_SSL_PROTO_TLS1 || \
kenjiArai 0:5b88d5760320 3295 MBEDTLS_SSL_PROTO_TLS1_1 */
kenjiArai 0:5b88d5760320 3296 {
kenjiArai 0:5b88d5760320 3297 /* C: MD5 + SHA1 */
kenjiArai 0:5b88d5760320 3298 md_alg = MBEDTLS_MD_NONE;
kenjiArai 0:5b88d5760320 3299 }
kenjiArai 0:5b88d5760320 3300
kenjiArai 0:5b88d5760320 3301 MBEDTLS_SSL_DEBUG_MSG( 3, ( "pick hash algorithm %d for signing", md_alg ) );
kenjiArai 0:5b88d5760320 3302
kenjiArai 0:5b88d5760320 3303 /*
kenjiArai 0:5b88d5760320 3304 * 2.2: Compute the hash to be signed
kenjiArai 0:5b88d5760320 3305 */
kenjiArai 0:5b88d5760320 3306 #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
kenjiArai 0:5b88d5760320 3307 defined(MBEDTLS_SSL_PROTO_TLS1_1)
kenjiArai 0:5b88d5760320 3308 if( md_alg == MBEDTLS_MD_NONE )
kenjiArai 0:5b88d5760320 3309 {
kenjiArai 0:5b88d5760320 3310 hashlen = 36;
kenjiArai 0:5b88d5760320 3311 ret = mbedtls_ssl_get_key_exchange_md_ssl_tls( ssl, hash,
kenjiArai 0:5b88d5760320 3312 dig_signed,
kenjiArai 0:5b88d5760320 3313 dig_signed_len );
kenjiArai 0:5b88d5760320 3314 if( ret != 0 )
kenjiArai 0:5b88d5760320 3315 return( ret );
kenjiArai 0:5b88d5760320 3316 }
kenjiArai 0:5b88d5760320 3317 else
kenjiArai 0:5b88d5760320 3318 #endif /* MBEDTLS_SSL_PROTO_SSL3 || MBEDTLS_SSL_PROTO_TLS1 || \
kenjiArai 0:5b88d5760320 3319 MBEDTLS_SSL_PROTO_TLS1_1 */
kenjiArai 0:5b88d5760320 3320 #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
kenjiArai 0:5b88d5760320 3321 defined(MBEDTLS_SSL_PROTO_TLS1_2)
kenjiArai 0:5b88d5760320 3322 if( md_alg != MBEDTLS_MD_NONE )
kenjiArai 0:5b88d5760320 3323 {
kenjiArai 0:5b88d5760320 3324 ret = mbedtls_ssl_get_key_exchange_md_tls1_2( ssl, hash, &hashlen,
kenjiArai 0:5b88d5760320 3325 dig_signed,
kenjiArai 0:5b88d5760320 3326 dig_signed_len,
kenjiArai 0:5b88d5760320 3327 md_alg );
kenjiArai 0:5b88d5760320 3328 if( ret != 0 )
kenjiArai 0:5b88d5760320 3329 return( ret );
kenjiArai 0:5b88d5760320 3330 }
kenjiArai 0:5b88d5760320 3331 else
kenjiArai 0:5b88d5760320 3332 #endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \
kenjiArai 0:5b88d5760320 3333 MBEDTLS_SSL_PROTO_TLS1_2 */
kenjiArai 0:5b88d5760320 3334 {
kenjiArai 0:5b88d5760320 3335 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
kenjiArai 0:5b88d5760320 3336 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
kenjiArai 0:5b88d5760320 3337 }
kenjiArai 0:5b88d5760320 3338
kenjiArai 0:5b88d5760320 3339 MBEDTLS_SSL_DEBUG_BUF( 3, "parameters hash", hash, hashlen );
kenjiArai 0:5b88d5760320 3340
kenjiArai 0:5b88d5760320 3341 /*
kenjiArai 0:5b88d5760320 3342 * 2.3: Compute and add the signature
kenjiArai 0:5b88d5760320 3343 */
kenjiArai 0:5b88d5760320 3344 #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
kenjiArai 0:5b88d5760320 3345 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
kenjiArai 0:5b88d5760320 3346 {
kenjiArai 0:5b88d5760320 3347 /*
kenjiArai 0:5b88d5760320 3348 * For TLS 1.2, we need to specify signature and hash algorithm
kenjiArai 0:5b88d5760320 3349 * explicitly through a prefix to the signature.
kenjiArai 0:5b88d5760320 3350 *
kenjiArai 0:5b88d5760320 3351 * struct {
kenjiArai 0:5b88d5760320 3352 * HashAlgorithm hash;
kenjiArai 0:5b88d5760320 3353 * SignatureAlgorithm signature;
kenjiArai 0:5b88d5760320 3354 * } SignatureAndHashAlgorithm;
kenjiArai 0:5b88d5760320 3355 *
kenjiArai 0:5b88d5760320 3356 * struct {
kenjiArai 0:5b88d5760320 3357 * SignatureAndHashAlgorithm algorithm;
kenjiArai 0:5b88d5760320 3358 * opaque signature<0..2^16-1>;
kenjiArai 0:5b88d5760320 3359 * } DigitallySigned;
kenjiArai 0:5b88d5760320 3360 *
kenjiArai 0:5b88d5760320 3361 */
kenjiArai 0:5b88d5760320 3362
kenjiArai 0:5b88d5760320 3363 ssl->out_msg[ssl->out_msglen++] =
kenjiArai 0:5b88d5760320 3364 mbedtls_ssl_hash_from_md_alg( md_alg );
kenjiArai 0:5b88d5760320 3365 ssl->out_msg[ssl->out_msglen++] =
kenjiArai 0:5b88d5760320 3366 mbedtls_ssl_sig_from_pk_alg( sig_alg );
kenjiArai 0:5b88d5760320 3367 }
kenjiArai 0:5b88d5760320 3368 #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
kenjiArai 0:5b88d5760320 3369
kenjiArai 0:5b88d5760320 3370 #if defined(MBEDTLS_SSL_ASYNC_PRIVATE)
kenjiArai 0:5b88d5760320 3371 if( ssl->conf->f_async_sign_start != NULL )
kenjiArai 0:5b88d5760320 3372 {
kenjiArai 0:5b88d5760320 3373 ret = ssl->conf->f_async_sign_start( ssl,
kenjiArai 0:5b88d5760320 3374 mbedtls_ssl_own_cert( ssl ),
kenjiArai 0:5b88d5760320 3375 md_alg, hash, hashlen );
kenjiArai 0:5b88d5760320 3376 switch( ret )
kenjiArai 0:5b88d5760320 3377 {
kenjiArai 0:5b88d5760320 3378 case MBEDTLS_ERR_SSL_HW_ACCEL_FALLTHROUGH:
kenjiArai 0:5b88d5760320 3379 /* act as if f_async_sign was null */
kenjiArai 0:5b88d5760320 3380 break;
kenjiArai 0:5b88d5760320 3381 case 0:
kenjiArai 0:5b88d5760320 3382 ssl->handshake->async_in_progress = 1;
kenjiArai 0:5b88d5760320 3383 return( ssl_resume_server_key_exchange( ssl, signature_len ) );
kenjiArai 0:5b88d5760320 3384 case MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS:
kenjiArai 0:5b88d5760320 3385 ssl->handshake->async_in_progress = 1;
kenjiArai 0:5b88d5760320 3386 return( MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS );
kenjiArai 0:5b88d5760320 3387 default:
kenjiArai 0:5b88d5760320 3388 MBEDTLS_SSL_DEBUG_RET( 1, "f_async_sign_start", ret );
kenjiArai 0:5b88d5760320 3389 return( ret );
kenjiArai 0:5b88d5760320 3390 }
kenjiArai 0:5b88d5760320 3391 }
kenjiArai 0:5b88d5760320 3392 #endif /* MBEDTLS_SSL_ASYNC_PRIVATE */
kenjiArai 0:5b88d5760320 3393
kenjiArai 0:5b88d5760320 3394 if( mbedtls_ssl_own_key( ssl ) == NULL )
kenjiArai 0:5b88d5760320 3395 {
kenjiArai 0:5b88d5760320 3396 MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no private key" ) );
kenjiArai 0:5b88d5760320 3397 return( MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED );
kenjiArai 0:5b88d5760320 3398 }
kenjiArai 0:5b88d5760320 3399
kenjiArai 0:5b88d5760320 3400 /* Append the signature to ssl->out_msg, leaving 2 bytes for the
kenjiArai 0:5b88d5760320 3401 * signature length which will be added in ssl_write_server_key_exchange
kenjiArai 0:5b88d5760320 3402 * after the call to ssl_prepare_server_key_exchange.
kenjiArai 0:5b88d5760320 3403 * ssl_write_server_key_exchange also takes care of incrementing
kenjiArai 0:5b88d5760320 3404 * ssl->out_msglen. */
kenjiArai 0:5b88d5760320 3405 if( ( ret = mbedtls_pk_sign( mbedtls_ssl_own_key( ssl ),
kenjiArai 0:5b88d5760320 3406 md_alg, hash, hashlen,
kenjiArai 0:5b88d5760320 3407 ssl->out_msg + ssl->out_msglen + 2,
kenjiArai 0:5b88d5760320 3408 signature_len,
kenjiArai 0:5b88d5760320 3409 ssl->conf->f_rng,
kenjiArai 0:5b88d5760320 3410 ssl->conf->p_rng ) ) != 0 )
kenjiArai 0:5b88d5760320 3411 {
kenjiArai 0:5b88d5760320 3412 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_pk_sign", ret );
kenjiArai 0:5b88d5760320 3413 return( ret );
kenjiArai 0:5b88d5760320 3414 }
kenjiArai 0:5b88d5760320 3415 }
kenjiArai 0:5b88d5760320 3416 #endif /* MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED */
kenjiArai 0:5b88d5760320 3417
kenjiArai 0:5b88d5760320 3418 return( 0 );
kenjiArai 0:5b88d5760320 3419 }
kenjiArai 0:5b88d5760320 3420
kenjiArai 0:5b88d5760320 3421 /* Prepare the ServerKeyExchange message and send it. For ciphersuites
kenjiArai 0:5b88d5760320 3422 * that do not include a ServerKeyExchange message, do nothing. Either
kenjiArai 0:5b88d5760320 3423 * way, if successful, move on to the next step in the SSL state
kenjiArai 0:5b88d5760320 3424 * machine. */
kenjiArai 0:5b88d5760320 3425 static int ssl_write_server_key_exchange( mbedtls_ssl_context *ssl )
kenjiArai 0:5b88d5760320 3426 {
kenjiArai 0:5b88d5760320 3427 int ret;
kenjiArai 0:5b88d5760320 3428 size_t signature_len = 0;
kenjiArai 0:5b88d5760320 3429 #if defined(MBEDTLS_KEY_EXCHANGE__SOME_NON_PFS__ENABLED)
kenjiArai 0:5b88d5760320 3430 const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
kenjiArai 0:5b88d5760320 3431 ssl->handshake->ciphersuite_info;
kenjiArai 0:5b88d5760320 3432 #endif /* MBEDTLS_KEY_EXCHANGE__SOME_NON_PFS__ENABLED */
kenjiArai 0:5b88d5760320 3433
kenjiArai 0:5b88d5760320 3434 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write server key exchange" ) );
kenjiArai 0:5b88d5760320 3435
kenjiArai 0:5b88d5760320 3436 #if defined(MBEDTLS_KEY_EXCHANGE__SOME_NON_PFS__ENABLED)
kenjiArai 0:5b88d5760320 3437 /* Extract static ECDH parameters and abort if ServerKeyExchange
kenjiArai 0:5b88d5760320 3438 * is not needed. */
kenjiArai 0:5b88d5760320 3439 if( mbedtls_ssl_ciphersuite_no_pfs( ciphersuite_info ) )
kenjiArai 0:5b88d5760320 3440 {
kenjiArai 0:5b88d5760320 3441 /* For suites involving ECDH, extract DH parameters
kenjiArai 0:5b88d5760320 3442 * from certificate at this point. */
kenjiArai 0:5b88d5760320 3443 #if defined(MBEDTLS_KEY_EXCHANGE__SOME__ECDH_ENABLED)
kenjiArai 0:5b88d5760320 3444 if( mbedtls_ssl_ciphersuite_uses_ecdh( ciphersuite_info ) )
kenjiArai 0:5b88d5760320 3445 {
kenjiArai 0:5b88d5760320 3446 ssl_get_ecdh_params_from_cert( ssl );
kenjiArai 0:5b88d5760320 3447 }
kenjiArai 0:5b88d5760320 3448 #endif /* MBEDTLS_KEY_EXCHANGE__SOME__ECDH_ENABLED */
kenjiArai 0:5b88d5760320 3449
kenjiArai 0:5b88d5760320 3450 /* Key exchanges not involving ephemeral keys don't use
kenjiArai 0:5b88d5760320 3451 * ServerKeyExchange, so end here. */
kenjiArai 0:5b88d5760320 3452 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write server key exchange" ) );
kenjiArai 0:5b88d5760320 3453 ssl->state++;
kenjiArai 0:5b88d5760320 3454 return( 0 );
kenjiArai 0:5b88d5760320 3455 }
kenjiArai 0:5b88d5760320 3456 #endif /* MBEDTLS_KEY_EXCHANGE__SOME_NON_PFS__ENABLED */
kenjiArai 0:5b88d5760320 3457
kenjiArai 0:5b88d5760320 3458 #if defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED) && \
kenjiArai 0:5b88d5760320 3459 defined(MBEDTLS_SSL_ASYNC_PRIVATE)
kenjiArai 0:5b88d5760320 3460 /* If we have already prepared the message and there is an ongoing
kenjiArai 0:5b88d5760320 3461 * signature operation, resume signing. */
kenjiArai 0:5b88d5760320 3462 if( ssl->handshake->async_in_progress != 0 )
kenjiArai 0:5b88d5760320 3463 {
kenjiArai 0:5b88d5760320 3464 MBEDTLS_SSL_DEBUG_MSG( 2, ( "resuming signature operation" ) );
kenjiArai 0:5b88d5760320 3465 ret = ssl_resume_server_key_exchange( ssl, &signature_len );
kenjiArai 0:5b88d5760320 3466 }
kenjiArai 0:5b88d5760320 3467 else
kenjiArai 0:5b88d5760320 3468 #endif /* defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED) &&
kenjiArai 0:5b88d5760320 3469 defined(MBEDTLS_SSL_ASYNC_PRIVATE) */
kenjiArai 0:5b88d5760320 3470 {
kenjiArai 0:5b88d5760320 3471 /* ServerKeyExchange is needed. Prepare the message. */
kenjiArai 0:5b88d5760320 3472 ret = ssl_prepare_server_key_exchange( ssl, &signature_len );
kenjiArai 0:5b88d5760320 3473 }
kenjiArai 0:5b88d5760320 3474
kenjiArai 0:5b88d5760320 3475 if( ret != 0 )
kenjiArai 0:5b88d5760320 3476 {
kenjiArai 0:5b88d5760320 3477 /* If we're starting to write a new message, set ssl->out_msglen
kenjiArai 0:5b88d5760320 3478 * to 0. But if we're resuming after an asynchronous message,
kenjiArai 0:5b88d5760320 3479 * out_msglen is the amount of data written so far and mst be
kenjiArai 0:5b88d5760320 3480 * preserved. */
kenjiArai 0:5b88d5760320 3481 if( ret == MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS )
kenjiArai 0:5b88d5760320 3482 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write server key exchange (pending)" ) );
kenjiArai 0:5b88d5760320 3483 else
kenjiArai 0:5b88d5760320 3484 ssl->out_msglen = 0;
kenjiArai 0:5b88d5760320 3485 return( ret );
kenjiArai 0:5b88d5760320 3486 }
kenjiArai 0:5b88d5760320 3487
kenjiArai 0:5b88d5760320 3488 /* If there is a signature, write its length.
kenjiArai 0:5b88d5760320 3489 * ssl_prepare_server_key_exchange already wrote the signature
kenjiArai 0:5b88d5760320 3490 * itself at its proper place in the output buffer. */
kenjiArai 0:5b88d5760320 3491 #if defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED)
kenjiArai 0:5b88d5760320 3492 if( signature_len != 0 )
kenjiArai 0:5b88d5760320 3493 {
kenjiArai 0:5b88d5760320 3494 ssl->out_msg[ssl->out_msglen++] = (unsigned char)( signature_len >> 8 );
kenjiArai 0:5b88d5760320 3495 ssl->out_msg[ssl->out_msglen++] = (unsigned char)( signature_len );
kenjiArai 0:5b88d5760320 3496
kenjiArai 0:5b88d5760320 3497 MBEDTLS_SSL_DEBUG_BUF( 3, "my signature",
kenjiArai 0:5b88d5760320 3498 ssl->out_msg + ssl->out_msglen,
kenjiArai 0:5b88d5760320 3499 signature_len );
kenjiArai 0:5b88d5760320 3500
kenjiArai 0:5b88d5760320 3501 /* Skip over the already-written signature */
kenjiArai 0:5b88d5760320 3502 ssl->out_msglen += signature_len;
kenjiArai 0:5b88d5760320 3503 }
kenjiArai 0:5b88d5760320 3504 #endif /* MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED */
kenjiArai 0:5b88d5760320 3505
kenjiArai 0:5b88d5760320 3506 /* Add header and send. */
kenjiArai 0:5b88d5760320 3507 ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
kenjiArai 0:5b88d5760320 3508 ssl->out_msg[0] = MBEDTLS_SSL_HS_SERVER_KEY_EXCHANGE;
kenjiArai 0:5b88d5760320 3509
kenjiArai 0:5b88d5760320 3510 ssl->state++;
kenjiArai 0:5b88d5760320 3511
kenjiArai 0:5b88d5760320 3512 if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 )
kenjiArai 0:5b88d5760320 3513 {
kenjiArai 0:5b88d5760320 3514 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret );
kenjiArai 0:5b88d5760320 3515 return( ret );
kenjiArai 0:5b88d5760320 3516 }
kenjiArai 0:5b88d5760320 3517
kenjiArai 0:5b88d5760320 3518 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write server key exchange" ) );
kenjiArai 0:5b88d5760320 3519 return( 0 );
kenjiArai 0:5b88d5760320 3520 }
kenjiArai 0:5b88d5760320 3521
kenjiArai 0:5b88d5760320 3522 static int ssl_write_server_hello_done( mbedtls_ssl_context *ssl )
kenjiArai 0:5b88d5760320 3523 {
kenjiArai 0:5b88d5760320 3524 int ret;
kenjiArai 0:5b88d5760320 3525
kenjiArai 0:5b88d5760320 3526 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write server hello done" ) );
kenjiArai 0:5b88d5760320 3527
kenjiArai 0:5b88d5760320 3528 ssl->out_msglen = 4;
kenjiArai 0:5b88d5760320 3529 ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
kenjiArai 0:5b88d5760320 3530 ssl->out_msg[0] = MBEDTLS_SSL_HS_SERVER_HELLO_DONE;
kenjiArai 0:5b88d5760320 3531
kenjiArai 0:5b88d5760320 3532 ssl->state++;
kenjiArai 0:5b88d5760320 3533
kenjiArai 0:5b88d5760320 3534 #if defined(MBEDTLS_SSL_PROTO_DTLS)
kenjiArai 0:5b88d5760320 3535 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
kenjiArai 0:5b88d5760320 3536 mbedtls_ssl_send_flight_completed( ssl );
kenjiArai 0:5b88d5760320 3537 #endif
kenjiArai 0:5b88d5760320 3538
kenjiArai 0:5b88d5760320 3539 if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 )
kenjiArai 0:5b88d5760320 3540 {
kenjiArai 0:5b88d5760320 3541 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret );
kenjiArai 0:5b88d5760320 3542 return( ret );
kenjiArai 0:5b88d5760320 3543 }
kenjiArai 0:5b88d5760320 3544
kenjiArai 0:5b88d5760320 3545 #if defined(MBEDTLS_SSL_PROTO_DTLS)
kenjiArai 0:5b88d5760320 3546 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
kenjiArai 0:5b88d5760320 3547 ( ret = mbedtls_ssl_flight_transmit( ssl ) ) != 0 )
kenjiArai 0:5b88d5760320 3548 {
kenjiArai 0:5b88d5760320 3549 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_flight_transmit", ret );
kenjiArai 0:5b88d5760320 3550 return( ret );
kenjiArai 0:5b88d5760320 3551 }
kenjiArai 0:5b88d5760320 3552 #endif /* MBEDTLS_SSL_PROTO_DTLS */
kenjiArai 0:5b88d5760320 3553
kenjiArai 0:5b88d5760320 3554 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write server hello done" ) );
kenjiArai 0:5b88d5760320 3555
kenjiArai 0:5b88d5760320 3556 return( 0 );
kenjiArai 0:5b88d5760320 3557 }
kenjiArai 0:5b88d5760320 3558
kenjiArai 0:5b88d5760320 3559 #if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) || \
kenjiArai 0:5b88d5760320 3560 defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED)
kenjiArai 0:5b88d5760320 3561 static int ssl_parse_client_dh_public( mbedtls_ssl_context *ssl, unsigned char **p,
kenjiArai 0:5b88d5760320 3562 const unsigned char *end )
kenjiArai 0:5b88d5760320 3563 {
kenjiArai 0:5b88d5760320 3564 int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
kenjiArai 0:5b88d5760320 3565 size_t n;
kenjiArai 0:5b88d5760320 3566
kenjiArai 0:5b88d5760320 3567 /*
kenjiArai 0:5b88d5760320 3568 * Receive G^Y mod P, premaster = (G^Y)^X mod P
kenjiArai 0:5b88d5760320 3569 */
kenjiArai 0:5b88d5760320 3570 if( *p + 2 > end )
kenjiArai 0:5b88d5760320 3571 {
kenjiArai 0:5b88d5760320 3572 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
kenjiArai 0:5b88d5760320 3573 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
kenjiArai 0:5b88d5760320 3574 }
kenjiArai 0:5b88d5760320 3575
kenjiArai 0:5b88d5760320 3576 n = ( (*p)[0] << 8 ) | (*p)[1];
kenjiArai 0:5b88d5760320 3577 *p += 2;
kenjiArai 0:5b88d5760320 3578
kenjiArai 0:5b88d5760320 3579 if( *p + n > end )
kenjiArai 0:5b88d5760320 3580 {
kenjiArai 0:5b88d5760320 3581 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
kenjiArai 0:5b88d5760320 3582 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
kenjiArai 0:5b88d5760320 3583 }
kenjiArai 0:5b88d5760320 3584
kenjiArai 0:5b88d5760320 3585 if( ( ret = mbedtls_dhm_read_public( &ssl->handshake->dhm_ctx, *p, n ) ) != 0 )
kenjiArai 0:5b88d5760320 3586 {
kenjiArai 0:5b88d5760320 3587 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_read_public", ret );
kenjiArai 0:5b88d5760320 3588 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_RP );
kenjiArai 0:5b88d5760320 3589 }
kenjiArai 0:5b88d5760320 3590
kenjiArai 0:5b88d5760320 3591 *p += n;
kenjiArai 0:5b88d5760320 3592
kenjiArai 0:5b88d5760320 3593 MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: GY", &ssl->handshake->dhm_ctx.GY );
kenjiArai 0:5b88d5760320 3594
kenjiArai 0:5b88d5760320 3595 return( ret );
kenjiArai 0:5b88d5760320 3596 }
kenjiArai 0:5b88d5760320 3597 #endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED ||
kenjiArai 0:5b88d5760320 3598 MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */
kenjiArai 0:5b88d5760320 3599
kenjiArai 0:5b88d5760320 3600 #if defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) || \
kenjiArai 0:5b88d5760320 3601 defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED)
kenjiArai 0:5b88d5760320 3602
kenjiArai 0:5b88d5760320 3603 #if defined(MBEDTLS_SSL_ASYNC_PRIVATE)
kenjiArai 0:5b88d5760320 3604 static int ssl_resume_decrypt_pms( mbedtls_ssl_context *ssl,
kenjiArai 0:5b88d5760320 3605 unsigned char *peer_pms,
kenjiArai 0:5b88d5760320 3606 size_t *peer_pmslen,
kenjiArai 0:5b88d5760320 3607 size_t peer_pmssize )
kenjiArai 0:5b88d5760320 3608 {
kenjiArai 0:5b88d5760320 3609 int ret = ssl->conf->f_async_resume( ssl,
kenjiArai 0:5b88d5760320 3610 peer_pms, peer_pmslen, peer_pmssize );
kenjiArai 0:5b88d5760320 3611 if( ret != MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS )
kenjiArai 0:5b88d5760320 3612 {
kenjiArai 0:5b88d5760320 3613 ssl->handshake->async_in_progress = 0;
kenjiArai 0:5b88d5760320 3614 mbedtls_ssl_set_async_operation_data( ssl, NULL );
kenjiArai 0:5b88d5760320 3615 }
kenjiArai 0:5b88d5760320 3616 MBEDTLS_SSL_DEBUG_RET( 2, "ssl_decrypt_encrypted_pms", ret );
kenjiArai 0:5b88d5760320 3617 return( ret );
kenjiArai 0:5b88d5760320 3618 }
kenjiArai 0:5b88d5760320 3619 #endif /* MBEDTLS_SSL_ASYNC_PRIVATE */
kenjiArai 0:5b88d5760320 3620
kenjiArai 0:5b88d5760320 3621 static int ssl_decrypt_encrypted_pms( mbedtls_ssl_context *ssl,
kenjiArai 0:5b88d5760320 3622 const unsigned char *p,
kenjiArai 0:5b88d5760320 3623 const unsigned char *end,
kenjiArai 0:5b88d5760320 3624 unsigned char *peer_pms,
kenjiArai 0:5b88d5760320 3625 size_t *peer_pmslen,
kenjiArai 0:5b88d5760320 3626 size_t peer_pmssize )
kenjiArai 0:5b88d5760320 3627 {
kenjiArai 0:5b88d5760320 3628 int ret;
kenjiArai 0:5b88d5760320 3629 mbedtls_pk_context *private_key = mbedtls_ssl_own_key( ssl );
kenjiArai 0:5b88d5760320 3630 mbedtls_pk_context *public_key = &mbedtls_ssl_own_cert( ssl )->pk;
kenjiArai 0:5b88d5760320 3631 size_t len = mbedtls_pk_get_len( public_key );
kenjiArai 0:5b88d5760320 3632
kenjiArai 0:5b88d5760320 3633 #if defined(MBEDTLS_SSL_ASYNC_PRIVATE)
kenjiArai 0:5b88d5760320 3634 /* If we have already started decoding the message and there is an ongoing
kenjiArai 0:5b88d5760320 3635 * decryption operation, resume signing. */
kenjiArai 0:5b88d5760320 3636 if( ssl->handshake->async_in_progress != 0 )
kenjiArai 0:5b88d5760320 3637 {
kenjiArai 0:5b88d5760320 3638 MBEDTLS_SSL_DEBUG_MSG( 2, ( "resuming decryption operation" ) );
kenjiArai 0:5b88d5760320 3639 return( ssl_resume_decrypt_pms( ssl,
kenjiArai 0:5b88d5760320 3640 peer_pms, peer_pmslen, peer_pmssize ) );
kenjiArai 0:5b88d5760320 3641 }
kenjiArai 0:5b88d5760320 3642 #endif /* MBEDTLS_SSL_ASYNC_PRIVATE */
kenjiArai 0:5b88d5760320 3643
kenjiArai 0:5b88d5760320 3644 /*
kenjiArai 0:5b88d5760320 3645 * Prepare to decrypt the premaster using own private RSA key
kenjiArai 0:5b88d5760320 3646 */
kenjiArai 0:5b88d5760320 3647 #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
kenjiArai 0:5b88d5760320 3648 defined(MBEDTLS_SSL_PROTO_TLS1_2)
kenjiArai 0:5b88d5760320 3649 if( ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_0 )
kenjiArai 0:5b88d5760320 3650 {
kenjiArai 0:5b88d5760320 3651 if ( p + 2 > end ) {
kenjiArai 0:5b88d5760320 3652 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
kenjiArai 0:5b88d5760320 3653 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
kenjiArai 0:5b88d5760320 3654 }
kenjiArai 0:5b88d5760320 3655 if( *p++ != ( ( len >> 8 ) & 0xFF ) ||
kenjiArai 0:5b88d5760320 3656 *p++ != ( ( len ) & 0xFF ) )
kenjiArai 0:5b88d5760320 3657 {
kenjiArai 0:5b88d5760320 3658 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
kenjiArai 0:5b88d5760320 3659 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
kenjiArai 0:5b88d5760320 3660 }
kenjiArai 0:5b88d5760320 3661 }
kenjiArai 0:5b88d5760320 3662 #endif
kenjiArai 0:5b88d5760320 3663
kenjiArai 0:5b88d5760320 3664 if( p + len != end )
kenjiArai 0:5b88d5760320 3665 {
kenjiArai 0:5b88d5760320 3666 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
kenjiArai 0:5b88d5760320 3667 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
kenjiArai 0:5b88d5760320 3668 }
kenjiArai 0:5b88d5760320 3669
kenjiArai 0:5b88d5760320 3670 /*
kenjiArai 0:5b88d5760320 3671 * Decrypt the premaster secret
kenjiArai 0:5b88d5760320 3672 */
kenjiArai 0:5b88d5760320 3673 #if defined(MBEDTLS_SSL_ASYNC_PRIVATE)
kenjiArai 0:5b88d5760320 3674 if( ssl->conf->f_async_decrypt_start != NULL )
kenjiArai 0:5b88d5760320 3675 {
kenjiArai 0:5b88d5760320 3676 ret = ssl->conf->f_async_decrypt_start( ssl,
kenjiArai 0:5b88d5760320 3677 mbedtls_ssl_own_cert( ssl ),
kenjiArai 0:5b88d5760320 3678 p, len );
kenjiArai 0:5b88d5760320 3679 switch( ret )
kenjiArai 0:5b88d5760320 3680 {
kenjiArai 0:5b88d5760320 3681 case MBEDTLS_ERR_SSL_HW_ACCEL_FALLTHROUGH:
kenjiArai 0:5b88d5760320 3682 /* act as if f_async_decrypt_start was null */
kenjiArai 0:5b88d5760320 3683 break;
kenjiArai 0:5b88d5760320 3684 case 0:
kenjiArai 0:5b88d5760320 3685 ssl->handshake->async_in_progress = 1;
kenjiArai 0:5b88d5760320 3686 return( ssl_resume_decrypt_pms( ssl,
kenjiArai 0:5b88d5760320 3687 peer_pms,
kenjiArai 0:5b88d5760320 3688 peer_pmslen,
kenjiArai 0:5b88d5760320 3689 peer_pmssize ) );
kenjiArai 0:5b88d5760320 3690 case MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS:
kenjiArai 0:5b88d5760320 3691 ssl->handshake->async_in_progress = 1;
kenjiArai 0:5b88d5760320 3692 return( MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS );
kenjiArai 0:5b88d5760320 3693 default:
kenjiArai 0:5b88d5760320 3694 MBEDTLS_SSL_DEBUG_RET( 1, "f_async_decrypt_start", ret );
kenjiArai 0:5b88d5760320 3695 return( ret );
kenjiArai 0:5b88d5760320 3696 }
kenjiArai 0:5b88d5760320 3697 }
kenjiArai 0:5b88d5760320 3698 #endif /* MBEDTLS_SSL_ASYNC_PRIVATE */
kenjiArai 0:5b88d5760320 3699
kenjiArai 0:5b88d5760320 3700 if( ! mbedtls_pk_can_do( private_key, MBEDTLS_PK_RSA ) )
kenjiArai 0:5b88d5760320 3701 {
kenjiArai 0:5b88d5760320 3702 MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no RSA private key" ) );
kenjiArai 0:5b88d5760320 3703 return( MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED );
kenjiArai 0:5b88d5760320 3704 }
kenjiArai 0:5b88d5760320 3705
kenjiArai 0:5b88d5760320 3706 ret = mbedtls_pk_decrypt( private_key, p, len,
kenjiArai 0:5b88d5760320 3707 peer_pms, peer_pmslen, peer_pmssize,
kenjiArai 0:5b88d5760320 3708 ssl->conf->f_rng, ssl->conf->p_rng );
kenjiArai 0:5b88d5760320 3709 return( ret );
kenjiArai 0:5b88d5760320 3710 }
kenjiArai 0:5b88d5760320 3711
kenjiArai 0:5b88d5760320 3712 static int ssl_parse_encrypted_pms( mbedtls_ssl_context *ssl,
kenjiArai 0:5b88d5760320 3713 const unsigned char *p,
kenjiArai 0:5b88d5760320 3714 const unsigned char *end,
kenjiArai 0:5b88d5760320 3715 size_t pms_offset )
kenjiArai 0:5b88d5760320 3716 {
kenjiArai 0:5b88d5760320 3717 int ret;
kenjiArai 0:5b88d5760320 3718 unsigned char *pms = ssl->handshake->premaster + pms_offset;
kenjiArai 0:5b88d5760320 3719 unsigned char ver[2];
kenjiArai 0:5b88d5760320 3720 unsigned char fake_pms[48], peer_pms[48];
kenjiArai 0:5b88d5760320 3721 unsigned char mask;
kenjiArai 0:5b88d5760320 3722 size_t i, peer_pmslen;
kenjiArai 0:5b88d5760320 3723 unsigned int diff;
kenjiArai 0:5b88d5760320 3724
kenjiArai 0:5b88d5760320 3725 /* In case of a failure in decryption, the decryption may write less than
kenjiArai 0:5b88d5760320 3726 * 2 bytes of output, but we always read the first two bytes. It doesn't
kenjiArai 0:5b88d5760320 3727 * matter in the end because diff will be nonzero in that case due to
kenjiArai 0:5b88d5760320 3728 * peer_pmslen being less than 48, and we only care whether diff is 0.
kenjiArai 0:5b88d5760320 3729 * But do initialize peer_pms for robustness anyway. This also makes
kenjiArai 0:5b88d5760320 3730 * memory analyzers happy (don't access uninitialized memory, even
kenjiArai 0:5b88d5760320 3731 * if it's an unsigned char). */
kenjiArai 0:5b88d5760320 3732 peer_pms[0] = peer_pms[1] = ~0;
kenjiArai 0:5b88d5760320 3733
kenjiArai 0:5b88d5760320 3734 ret = ssl_decrypt_encrypted_pms( ssl, p, end,
kenjiArai 0:5b88d5760320 3735 peer_pms,
kenjiArai 0:5b88d5760320 3736 &peer_pmslen,
kenjiArai 0:5b88d5760320 3737 sizeof( peer_pms ) );
kenjiArai 0:5b88d5760320 3738
kenjiArai 0:5b88d5760320 3739 #if defined(MBEDTLS_SSL_ASYNC_PRIVATE)
kenjiArai 0:5b88d5760320 3740 if ( ret == MBEDTLS_ERR_SSL_ASYNC_IN_PROGRESS )
kenjiArai 0:5b88d5760320 3741 return( ret );
kenjiArai 0:5b88d5760320 3742 #endif /* MBEDTLS_SSL_ASYNC_PRIVATE */
kenjiArai 0:5b88d5760320 3743
kenjiArai 0:5b88d5760320 3744 mbedtls_ssl_write_version( ssl->handshake->max_major_ver,
kenjiArai 0:5b88d5760320 3745 ssl->handshake->max_minor_ver,
kenjiArai 0:5b88d5760320 3746 ssl->conf->transport, ver );
kenjiArai 0:5b88d5760320 3747
kenjiArai 0:5b88d5760320 3748 /* Avoid data-dependent branches while checking for invalid
kenjiArai 0:5b88d5760320 3749 * padding, to protect against timing-based Bleichenbacher-type
kenjiArai 0:5b88d5760320 3750 * attacks. */
kenjiArai 0:5b88d5760320 3751 diff = (unsigned int) ret;
kenjiArai 0:5b88d5760320 3752 diff |= peer_pmslen ^ 48;
kenjiArai 0:5b88d5760320 3753 diff |= peer_pms[0] ^ ver[0];
kenjiArai 0:5b88d5760320 3754 diff |= peer_pms[1] ^ ver[1];
kenjiArai 0:5b88d5760320 3755
kenjiArai 0:5b88d5760320 3756 /* mask = diff ? 0xff : 0x00 using bit operations to avoid branches */
kenjiArai 0:5b88d5760320 3757 /* MSVC has a warning about unary minus on unsigned, but this is
kenjiArai 0:5b88d5760320 3758 * well-defined and precisely what we want to do here */
kenjiArai 0:5b88d5760320 3759 #if defined(_MSC_VER)
kenjiArai 0:5b88d5760320 3760 #pragma warning( push )
kenjiArai 0:5b88d5760320 3761 #pragma warning( disable : 4146 )
kenjiArai 0:5b88d5760320 3762 #endif
kenjiArai 0:5b88d5760320 3763 mask = - ( ( diff | - diff ) >> ( sizeof( unsigned int ) * 8 - 1 ) );
kenjiArai 0:5b88d5760320 3764 #if defined(_MSC_VER)
kenjiArai 0:5b88d5760320 3765 #pragma warning( pop )
kenjiArai 0:5b88d5760320 3766 #endif
kenjiArai 0:5b88d5760320 3767
kenjiArai 0:5b88d5760320 3768 /*
kenjiArai 0:5b88d5760320 3769 * Protection against Bleichenbacher's attack: invalid PKCS#1 v1.5 padding
kenjiArai 0:5b88d5760320 3770 * must not cause the connection to end immediately; instead, send a
kenjiArai 0:5b88d5760320 3771 * bad_record_mac later in the handshake.
kenjiArai 0:5b88d5760320 3772 * To protect against timing-based variants of the attack, we must
kenjiArai 0:5b88d5760320 3773 * not have any branch that depends on whether the decryption was
kenjiArai 0:5b88d5760320 3774 * successful. In particular, always generate the fake premaster secret,
kenjiArai 0:5b88d5760320 3775 * regardless of whether it will ultimately influence the output or not.
kenjiArai 0:5b88d5760320 3776 */
kenjiArai 0:5b88d5760320 3777 ret = ssl->conf->f_rng( ssl->conf->p_rng, fake_pms, sizeof( fake_pms ) );
kenjiArai 0:5b88d5760320 3778 if( ret != 0 )
kenjiArai 0:5b88d5760320 3779 {
kenjiArai 0:5b88d5760320 3780 /* It's ok to abort on an RNG failure, since this does not reveal
kenjiArai 0:5b88d5760320 3781 * anything about the RSA decryption. */
kenjiArai 0:5b88d5760320 3782 return( ret );
kenjiArai 0:5b88d5760320 3783 }
kenjiArai 0:5b88d5760320 3784
kenjiArai 0:5b88d5760320 3785 #if defined(MBEDTLS_SSL_DEBUG_ALL)
kenjiArai 0:5b88d5760320 3786 if( diff != 0 )
kenjiArai 0:5b88d5760320 3787 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
kenjiArai 0:5b88d5760320 3788 #endif
kenjiArai 0:5b88d5760320 3789
kenjiArai 0:5b88d5760320 3790 if( sizeof( ssl->handshake->premaster ) < pms_offset ||
kenjiArai 0:5b88d5760320 3791 sizeof( ssl->handshake->premaster ) - pms_offset < 48 )
kenjiArai 0:5b88d5760320 3792 {
kenjiArai 0:5b88d5760320 3793 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
kenjiArai 0:5b88d5760320 3794 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
kenjiArai 0:5b88d5760320 3795 }
kenjiArai 0:5b88d5760320 3796 ssl->handshake->pmslen = 48;
kenjiArai 0:5b88d5760320 3797
kenjiArai 0:5b88d5760320 3798 /* Set pms to either the true or the fake PMS, without
kenjiArai 0:5b88d5760320 3799 * data-dependent branches. */
kenjiArai 0:5b88d5760320 3800 for( i = 0; i < ssl->handshake->pmslen; i++ )
kenjiArai 0:5b88d5760320 3801 pms[i] = ( mask & fake_pms[i] ) | ( (~mask) & peer_pms[i] );
kenjiArai 0:5b88d5760320 3802
kenjiArai 0:5b88d5760320 3803 return( 0 );
kenjiArai 0:5b88d5760320 3804 }
kenjiArai 0:5b88d5760320 3805 #endif /* MBEDTLS_KEY_EXCHANGE_RSA_ENABLED ||
kenjiArai 0:5b88d5760320 3806 MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */
kenjiArai 0:5b88d5760320 3807
kenjiArai 0:5b88d5760320 3808 #if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
kenjiArai 0:5b88d5760320 3809 static int ssl_parse_client_psk_identity( mbedtls_ssl_context *ssl, unsigned char **p,
kenjiArai 0:5b88d5760320 3810 const unsigned char *end )
kenjiArai 0:5b88d5760320 3811 {
kenjiArai 0:5b88d5760320 3812 int ret = 0;
kenjiArai 0:5b88d5760320 3813 size_t n;
kenjiArai 0:5b88d5760320 3814
kenjiArai 0:5b88d5760320 3815 if( ssl_conf_has_psk_or_cb( ssl->conf ) == 0 )
kenjiArai 0:5b88d5760320 3816 {
kenjiArai 0:5b88d5760320 3817 MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no pre-shared key" ) );
kenjiArai 0:5b88d5760320 3818 return( MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED );
kenjiArai 0:5b88d5760320 3819 }
kenjiArai 0:5b88d5760320 3820
kenjiArai 0:5b88d5760320 3821 /*
kenjiArai 0:5b88d5760320 3822 * Receive client pre-shared key identity name
kenjiArai 0:5b88d5760320 3823 */
kenjiArai 0:5b88d5760320 3824 if( end - *p < 2 )
kenjiArai 0:5b88d5760320 3825 {
kenjiArai 0:5b88d5760320 3826 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
kenjiArai 0:5b88d5760320 3827 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
kenjiArai 0:5b88d5760320 3828 }
kenjiArai 0:5b88d5760320 3829
kenjiArai 0:5b88d5760320 3830 n = ( (*p)[0] << 8 ) | (*p)[1];
kenjiArai 0:5b88d5760320 3831 *p += 2;
kenjiArai 0:5b88d5760320 3832
kenjiArai 0:5b88d5760320 3833 if( n < 1 || n > 65535 || n > (size_t) ( end - *p ) )
kenjiArai 0:5b88d5760320 3834 {
kenjiArai 0:5b88d5760320 3835 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
kenjiArai 0:5b88d5760320 3836 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
kenjiArai 0:5b88d5760320 3837 }
kenjiArai 0:5b88d5760320 3838
kenjiArai 0:5b88d5760320 3839 if( ssl->conf->f_psk != NULL )
kenjiArai 0:5b88d5760320 3840 {
kenjiArai 0:5b88d5760320 3841 if( ssl->conf->f_psk( ssl->conf->p_psk, ssl, *p, n ) != 0 )
kenjiArai 0:5b88d5760320 3842 ret = MBEDTLS_ERR_SSL_UNKNOWN_IDENTITY;
kenjiArai 0:5b88d5760320 3843 }
kenjiArai 0:5b88d5760320 3844 else
kenjiArai 0:5b88d5760320 3845 {
kenjiArai 0:5b88d5760320 3846 /* Identity is not a big secret since clients send it in the clear,
kenjiArai 0:5b88d5760320 3847 * but treat it carefully anyway, just in case */
kenjiArai 0:5b88d5760320 3848 if( n != ssl->conf->psk_identity_len ||
kenjiArai 0:5b88d5760320 3849 mbedtls_ssl_safer_memcmp( ssl->conf->psk_identity, *p, n ) != 0 )
kenjiArai 0:5b88d5760320 3850 {
kenjiArai 0:5b88d5760320 3851 ret = MBEDTLS_ERR_SSL_UNKNOWN_IDENTITY;
kenjiArai 0:5b88d5760320 3852 }
kenjiArai 0:5b88d5760320 3853 }
kenjiArai 0:5b88d5760320 3854
kenjiArai 0:5b88d5760320 3855 if( ret == MBEDTLS_ERR_SSL_UNKNOWN_IDENTITY )
kenjiArai 0:5b88d5760320 3856 {
kenjiArai 0:5b88d5760320 3857 MBEDTLS_SSL_DEBUG_BUF( 3, "Unknown PSK identity", *p, n );
kenjiArai 0:5b88d5760320 3858 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
kenjiArai 0:5b88d5760320 3859 MBEDTLS_SSL_ALERT_MSG_UNKNOWN_PSK_IDENTITY );
kenjiArai 0:5b88d5760320 3860 return( MBEDTLS_ERR_SSL_UNKNOWN_IDENTITY );
kenjiArai 0:5b88d5760320 3861 }
kenjiArai 0:5b88d5760320 3862
kenjiArai 0:5b88d5760320 3863 *p += n;
kenjiArai 0:5b88d5760320 3864
kenjiArai 0:5b88d5760320 3865 return( 0 );
kenjiArai 0:5b88d5760320 3866 }
kenjiArai 0:5b88d5760320 3867 #endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */
kenjiArai 0:5b88d5760320 3868
kenjiArai 0:5b88d5760320 3869 static int ssl_parse_client_key_exchange( mbedtls_ssl_context *ssl )
kenjiArai 0:5b88d5760320 3870 {
kenjiArai 0:5b88d5760320 3871 int ret;
kenjiArai 0:5b88d5760320 3872 const mbedtls_ssl_ciphersuite_t *ciphersuite_info;
kenjiArai 0:5b88d5760320 3873 unsigned char *p, *end;
kenjiArai 0:5b88d5760320 3874
kenjiArai 0:5b88d5760320 3875 ciphersuite_info = ssl->handshake->ciphersuite_info;
kenjiArai 0:5b88d5760320 3876
kenjiArai 0:5b88d5760320 3877 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse client key exchange" ) );
kenjiArai 0:5b88d5760320 3878
kenjiArai 0:5b88d5760320 3879 #if defined(MBEDTLS_SSL_ASYNC_PRIVATE) && \
kenjiArai 0:5b88d5760320 3880 ( defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) || \
kenjiArai 0:5b88d5760320 3881 defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED) )
kenjiArai 0:5b88d5760320 3882 if( ( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK ||
kenjiArai 0:5b88d5760320 3883 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA ) &&
kenjiArai 0:5b88d5760320 3884 ( ssl->handshake->async_in_progress != 0 ) )
kenjiArai 0:5b88d5760320 3885 {
kenjiArai 0:5b88d5760320 3886 /* We've already read a record and there is an asynchronous
kenjiArai 0:5b88d5760320 3887 * operation in progress to decrypt it. So skip reading the
kenjiArai 0:5b88d5760320 3888 * record. */
kenjiArai 0:5b88d5760320 3889 MBEDTLS_SSL_DEBUG_MSG( 3, ( "will resume decryption of previously-read record" ) );
kenjiArai 0:5b88d5760320 3890 }
kenjiArai 0:5b88d5760320 3891 else
kenjiArai 0:5b88d5760320 3892 #endif
kenjiArai 0:5b88d5760320 3893 if( ( ret = mbedtls_ssl_read_record( ssl, 1 ) ) != 0 )
kenjiArai 0:5b88d5760320 3894 {
kenjiArai 0:5b88d5760320 3895 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
kenjiArai 0:5b88d5760320 3896 return( ret );
kenjiArai 0:5b88d5760320 3897 }
kenjiArai 0:5b88d5760320 3898
kenjiArai 0:5b88d5760320 3899 p = ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl );
kenjiArai 0:5b88d5760320 3900 end = ssl->in_msg + ssl->in_hslen;
kenjiArai 0:5b88d5760320 3901
kenjiArai 0:5b88d5760320 3902 if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE )
kenjiArai 0:5b88d5760320 3903 {
kenjiArai 0:5b88d5760320 3904 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
kenjiArai 0:5b88d5760320 3905 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
kenjiArai 0:5b88d5760320 3906 }
kenjiArai 0:5b88d5760320 3907
kenjiArai 0:5b88d5760320 3908 if( ssl->in_msg[0] != MBEDTLS_SSL_HS_CLIENT_KEY_EXCHANGE )
kenjiArai 0:5b88d5760320 3909 {
kenjiArai 0:5b88d5760320 3910 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange message" ) );
kenjiArai 0:5b88d5760320 3911 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
kenjiArai 0:5b88d5760320 3912 }
kenjiArai 0:5b88d5760320 3913
kenjiArai 0:5b88d5760320 3914 #if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED)
kenjiArai 0:5b88d5760320 3915 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_RSA )
kenjiArai 0:5b88d5760320 3916 {
kenjiArai 0:5b88d5760320 3917 if( ( ret = ssl_parse_client_dh_public( ssl, &p, end ) ) != 0 )
kenjiArai 0:5b88d5760320 3918 {
kenjiArai 0:5b88d5760320 3919 MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_dh_public" ), ret );
kenjiArai 0:5b88d5760320 3920 return( ret );
kenjiArai 0:5b88d5760320 3921 }
kenjiArai 0:5b88d5760320 3922
kenjiArai 0:5b88d5760320 3923 if( p != end )
kenjiArai 0:5b88d5760320 3924 {
kenjiArai 0:5b88d5760320 3925 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange" ) );
kenjiArai 0:5b88d5760320 3926 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
kenjiArai 0:5b88d5760320 3927 }
kenjiArai 0:5b88d5760320 3928
kenjiArai 0:5b88d5760320 3929 if( ( ret = mbedtls_dhm_calc_secret( &ssl->handshake->dhm_ctx,
kenjiArai 0:5b88d5760320 3930 ssl->handshake->premaster,
kenjiArai 0:5b88d5760320 3931 MBEDTLS_PREMASTER_SIZE,
kenjiArai 0:5b88d5760320 3932 &ssl->handshake->pmslen,
kenjiArai 0:5b88d5760320 3933 ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
kenjiArai 0:5b88d5760320 3934 {
kenjiArai 0:5b88d5760320 3935 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_calc_secret", ret );
kenjiArai 0:5b88d5760320 3936 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_CS );
kenjiArai 0:5b88d5760320 3937 }
kenjiArai 0:5b88d5760320 3938
kenjiArai 0:5b88d5760320 3939 MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: K ", &ssl->handshake->dhm_ctx.K );
kenjiArai 0:5b88d5760320 3940 }
kenjiArai 0:5b88d5760320 3941 else
kenjiArai 0:5b88d5760320 3942 #endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED */
kenjiArai 0:5b88d5760320 3943 #if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \
kenjiArai 0:5b88d5760320 3944 defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) || \
kenjiArai 0:5b88d5760320 3945 defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || \
kenjiArai 0:5b88d5760320 3946 defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)
kenjiArai 0:5b88d5760320 3947 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_RSA ||
kenjiArai 0:5b88d5760320 3948 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA ||
kenjiArai 0:5b88d5760320 3949 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_RSA ||
kenjiArai 0:5b88d5760320 3950 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA )
kenjiArai 0:5b88d5760320 3951 {
kenjiArai 0:5b88d5760320 3952 if( ( ret = mbedtls_ecdh_read_public( &ssl->handshake->ecdh_ctx,
kenjiArai 0:5b88d5760320 3953 p, end - p) ) != 0 )
kenjiArai 0:5b88d5760320 3954 {
kenjiArai 0:5b88d5760320 3955 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_read_public", ret );
kenjiArai 0:5b88d5760320 3956 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_RP );
kenjiArai 0:5b88d5760320 3957 }
kenjiArai 0:5b88d5760320 3958
kenjiArai 0:5b88d5760320 3959 MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx,
kenjiArai 0:5b88d5760320 3960 MBEDTLS_DEBUG_ECDH_QP );
kenjiArai 0:5b88d5760320 3961
kenjiArai 0:5b88d5760320 3962 if( ( ret = mbedtls_ecdh_calc_secret( &ssl->handshake->ecdh_ctx,
kenjiArai 0:5b88d5760320 3963 &ssl->handshake->pmslen,
kenjiArai 0:5b88d5760320 3964 ssl->handshake->premaster,
kenjiArai 0:5b88d5760320 3965 MBEDTLS_MPI_MAX_SIZE,
kenjiArai 0:5b88d5760320 3966 ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
kenjiArai 0:5b88d5760320 3967 {
kenjiArai 0:5b88d5760320 3968 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_calc_secret", ret );
kenjiArai 0:5b88d5760320 3969 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_CS );
kenjiArai 0:5b88d5760320 3970 }
kenjiArai 0:5b88d5760320 3971
kenjiArai 0:5b88d5760320 3972 MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx,
kenjiArai 0:5b88d5760320 3973 MBEDTLS_DEBUG_ECDH_Z );
kenjiArai 0:5b88d5760320 3974 }
kenjiArai 0:5b88d5760320 3975 else
kenjiArai 0:5b88d5760320 3976 #endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED ||
kenjiArai 0:5b88d5760320 3977 MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED ||
kenjiArai 0:5b88d5760320 3978 MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED ||
kenjiArai 0:5b88d5760320 3979 MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */
kenjiArai 0:5b88d5760320 3980 #if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED)
kenjiArai 0:5b88d5760320 3981 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK )
kenjiArai 0:5b88d5760320 3982 {
kenjiArai 0:5b88d5760320 3983 if( ( ret = ssl_parse_client_psk_identity( ssl, &p, end ) ) != 0 )
kenjiArai 0:5b88d5760320 3984 {
kenjiArai 0:5b88d5760320 3985 MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret );
kenjiArai 0:5b88d5760320 3986 return( ret );
kenjiArai 0:5b88d5760320 3987 }
kenjiArai 0:5b88d5760320 3988
kenjiArai 0:5b88d5760320 3989 if( p != end )
kenjiArai 0:5b88d5760320 3990 {
kenjiArai 0:5b88d5760320 3991 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange" ) );
kenjiArai 0:5b88d5760320 3992 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
kenjiArai 0:5b88d5760320 3993 }
kenjiArai 0:5b88d5760320 3994
kenjiArai 0:5b88d5760320 3995 #if defined(MBEDTLS_USE_PSA_CRYPTO)
kenjiArai 0:5b88d5760320 3996 /* For opaque PSKs, we perform the PSK-to-MS derivation atomatically
kenjiArai 0:5b88d5760320 3997 * and skip the intermediate PMS. */
kenjiArai 0:5b88d5760320 3998 if( ssl_use_opaque_psk( ssl ) == 1 )
kenjiArai 0:5b88d5760320 3999 MBEDTLS_SSL_DEBUG_MSG( 1, ( "skip PMS generation for opaque PSK" ) );
kenjiArai 0:5b88d5760320 4000 else
kenjiArai 0:5b88d5760320 4001 #endif /* MBEDTLS_USE_PSA_CRYPTO */
kenjiArai 0:5b88d5760320 4002 if( ( ret = mbedtls_ssl_psk_derive_premaster( ssl,
kenjiArai 0:5b88d5760320 4003 ciphersuite_info->key_exchange ) ) != 0 )
kenjiArai 0:5b88d5760320 4004 {
kenjiArai 0:5b88d5760320 4005 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_psk_derive_premaster", ret );
kenjiArai 0:5b88d5760320 4006 return( ret );
kenjiArai 0:5b88d5760320 4007 }
kenjiArai 0:5b88d5760320 4008 }
kenjiArai 0:5b88d5760320 4009 else
kenjiArai 0:5b88d5760320 4010 #endif /* MBEDTLS_KEY_EXCHANGE_PSK_ENABLED */
kenjiArai 0:5b88d5760320 4011 #if defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED)
kenjiArai 0:5b88d5760320 4012 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK )
kenjiArai 0:5b88d5760320 4013 {
kenjiArai 0:5b88d5760320 4014 #if defined(MBEDTLS_SSL_ASYNC_PRIVATE)
kenjiArai 0:5b88d5760320 4015 if ( ssl->handshake->async_in_progress != 0 )
kenjiArai 0:5b88d5760320 4016 {
kenjiArai 0:5b88d5760320 4017 /* There is an asynchronous operation in progress to
kenjiArai 0:5b88d5760320 4018 * decrypt the encrypted premaster secret, so skip
kenjiArai 0:5b88d5760320 4019 * directly to resuming this operation. */
kenjiArai 0:5b88d5760320 4020 MBEDTLS_SSL_DEBUG_MSG( 3, ( "PSK identity already parsed" ) );
kenjiArai 0:5b88d5760320 4021 /* Update p to skip the PSK identity. ssl_parse_encrypted_pms
kenjiArai 0:5b88d5760320 4022 * won't actually use it, but maintain p anyway for robustness. */
kenjiArai 0:5b88d5760320 4023 p += ssl->conf->psk_identity_len + 2;
kenjiArai 0:5b88d5760320 4024 }
kenjiArai 0:5b88d5760320 4025 else
kenjiArai 0:5b88d5760320 4026 #endif /* MBEDTLS_SSL_ASYNC_PRIVATE */
kenjiArai 0:5b88d5760320 4027 if( ( ret = ssl_parse_client_psk_identity( ssl, &p, end ) ) != 0 )
kenjiArai 0:5b88d5760320 4028 {
kenjiArai 0:5b88d5760320 4029 MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret );
kenjiArai 0:5b88d5760320 4030 return( ret );
kenjiArai 0:5b88d5760320 4031 }
kenjiArai 0:5b88d5760320 4032
kenjiArai 0:5b88d5760320 4033 #if defined(MBEDTLS_USE_PSA_CRYPTO)
kenjiArai 0:5b88d5760320 4034 /* Opaque PSKs are currently only supported for PSK-only. */
kenjiArai 0:5b88d5760320 4035 if( ssl_use_opaque_psk( ssl ) == 1 )
kenjiArai 0:5b88d5760320 4036 return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
kenjiArai 0:5b88d5760320 4037 #endif
kenjiArai 0:5b88d5760320 4038
kenjiArai 0:5b88d5760320 4039 if( ( ret = ssl_parse_encrypted_pms( ssl, p, end, 2 ) ) != 0 )
kenjiArai 0:5b88d5760320 4040 {
kenjiArai 0:5b88d5760320 4041 MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_encrypted_pms" ), ret );
kenjiArai 0:5b88d5760320 4042 return( ret );
kenjiArai 0:5b88d5760320 4043 }
kenjiArai 0:5b88d5760320 4044
kenjiArai 0:5b88d5760320 4045 if( ( ret = mbedtls_ssl_psk_derive_premaster( ssl,
kenjiArai 0:5b88d5760320 4046 ciphersuite_info->key_exchange ) ) != 0 )
kenjiArai 0:5b88d5760320 4047 {
kenjiArai 0:5b88d5760320 4048 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_psk_derive_premaster", ret );
kenjiArai 0:5b88d5760320 4049 return( ret );
kenjiArai 0:5b88d5760320 4050 }
kenjiArai 0:5b88d5760320 4051 }
kenjiArai 0:5b88d5760320 4052 else
kenjiArai 0:5b88d5760320 4053 #endif /* MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */
kenjiArai 0:5b88d5760320 4054 #if defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED)
kenjiArai 0:5b88d5760320 4055 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK )
kenjiArai 0:5b88d5760320 4056 {
kenjiArai 0:5b88d5760320 4057 if( ( ret = ssl_parse_client_psk_identity( ssl, &p, end ) ) != 0 )
kenjiArai 0:5b88d5760320 4058 {
kenjiArai 0:5b88d5760320 4059 MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret );
kenjiArai 0:5b88d5760320 4060 return( ret );
kenjiArai 0:5b88d5760320 4061 }
kenjiArai 0:5b88d5760320 4062 if( ( ret = ssl_parse_client_dh_public( ssl, &p, end ) ) != 0 )
kenjiArai 0:5b88d5760320 4063 {
kenjiArai 0:5b88d5760320 4064 MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_dh_public" ), ret );
kenjiArai 0:5b88d5760320 4065 return( ret );
kenjiArai 0:5b88d5760320 4066 }
kenjiArai 0:5b88d5760320 4067
kenjiArai 0:5b88d5760320 4068 #if defined(MBEDTLS_USE_PSA_CRYPTO)
kenjiArai 0:5b88d5760320 4069 /* Opaque PSKs are currently only supported for PSK-only. */
kenjiArai 0:5b88d5760320 4070 if( ssl_use_opaque_psk( ssl ) == 1 )
kenjiArai 0:5b88d5760320 4071 return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
kenjiArai 0:5b88d5760320 4072 #endif
kenjiArai 0:5b88d5760320 4073
kenjiArai 0:5b88d5760320 4074 if( p != end )
kenjiArai 0:5b88d5760320 4075 {
kenjiArai 0:5b88d5760320 4076 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad client key exchange" ) );
kenjiArai 0:5b88d5760320 4077 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE );
kenjiArai 0:5b88d5760320 4078 }
kenjiArai 0:5b88d5760320 4079
kenjiArai 0:5b88d5760320 4080 if( ( ret = mbedtls_ssl_psk_derive_premaster( ssl,
kenjiArai 0:5b88d5760320 4081 ciphersuite_info->key_exchange ) ) != 0 )
kenjiArai 0:5b88d5760320 4082 {
kenjiArai 0:5b88d5760320 4083 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_psk_derive_premaster", ret );
kenjiArai 0:5b88d5760320 4084 return( ret );
kenjiArai 0:5b88d5760320 4085 }
kenjiArai 0:5b88d5760320 4086 }
kenjiArai 0:5b88d5760320 4087 else
kenjiArai 0:5b88d5760320 4088 #endif /* MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */
kenjiArai 0:5b88d5760320 4089 #if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
kenjiArai 0:5b88d5760320 4090 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK )
kenjiArai 0:5b88d5760320 4091 {
kenjiArai 0:5b88d5760320 4092 if( ( ret = ssl_parse_client_psk_identity( ssl, &p, end ) ) != 0 )
kenjiArai 0:5b88d5760320 4093 {
kenjiArai 0:5b88d5760320 4094 MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_client_psk_identity" ), ret );
kenjiArai 0:5b88d5760320 4095 return( ret );
kenjiArai 0:5b88d5760320 4096 }
kenjiArai 0:5b88d5760320 4097
kenjiArai 0:5b88d5760320 4098 if( ( ret = mbedtls_ecdh_read_public( &ssl->handshake->ecdh_ctx,
kenjiArai 0:5b88d5760320 4099 p, end - p ) ) != 0 )
kenjiArai 0:5b88d5760320 4100 {
kenjiArai 0:5b88d5760320 4101 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_read_public", ret );
kenjiArai 0:5b88d5760320 4102 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_KEY_EXCHANGE_RP );
kenjiArai 0:5b88d5760320 4103 }
kenjiArai 0:5b88d5760320 4104
kenjiArai 0:5b88d5760320 4105 #if defined(MBEDTLS_USE_PSA_CRYPTO)
kenjiArai 0:5b88d5760320 4106 /* Opaque PSKs are currently only supported for PSK-only. */
kenjiArai 0:5b88d5760320 4107 if( ssl_use_opaque_psk( ssl ) == 1 )
kenjiArai 0:5b88d5760320 4108 return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
kenjiArai 0:5b88d5760320 4109 #endif
kenjiArai 0:5b88d5760320 4110
kenjiArai 0:5b88d5760320 4111 MBEDTLS_SSL_DEBUG_ECDH( 3, &ssl->handshake->ecdh_ctx,
kenjiArai 0:5b88d5760320 4112 MBEDTLS_DEBUG_ECDH_QP );
kenjiArai 0:5b88d5760320 4113
kenjiArai 0:5b88d5760320 4114 if( ( ret = mbedtls_ssl_psk_derive_premaster( ssl,
kenjiArai 0:5b88d5760320 4115 ciphersuite_info->key_exchange ) ) != 0 )
kenjiArai 0:5b88d5760320 4116 {
kenjiArai 0:5b88d5760320 4117 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_psk_derive_premaster", ret );
kenjiArai 0:5b88d5760320 4118 return( ret );
kenjiArai 0:5b88d5760320 4119 }
kenjiArai 0:5b88d5760320 4120 }
kenjiArai 0:5b88d5760320 4121 else
kenjiArai 0:5b88d5760320 4122 #endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */
kenjiArai 0:5b88d5760320 4123 #if defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED)
kenjiArai 0:5b88d5760320 4124 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA )
kenjiArai 0:5b88d5760320 4125 {
kenjiArai 0:5b88d5760320 4126 if( ( ret = ssl_parse_encrypted_pms( ssl, p, end, 0 ) ) != 0 )
kenjiArai 0:5b88d5760320 4127 {
kenjiArai 0:5b88d5760320 4128 MBEDTLS_SSL_DEBUG_RET( 1, ( "ssl_parse_parse_encrypted_pms_secret" ), ret );
kenjiArai 0:5b88d5760320 4129 return( ret );
kenjiArai 0:5b88d5760320 4130 }
kenjiArai 0:5b88d5760320 4131 }
kenjiArai 0:5b88d5760320 4132 else
kenjiArai 0:5b88d5760320 4133 #endif /* MBEDTLS_KEY_EXCHANGE_RSA_ENABLED */
kenjiArai 0:5b88d5760320 4134 #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
kenjiArai 0:5b88d5760320 4135 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
kenjiArai 0:5b88d5760320 4136 {
kenjiArai 0:5b88d5760320 4137 ret = mbedtls_ecjpake_read_round_two( &ssl->handshake->ecjpake_ctx,
kenjiArai 0:5b88d5760320 4138 p, end - p );
kenjiArai 0:5b88d5760320 4139 if( ret != 0 )
kenjiArai 0:5b88d5760320 4140 {
kenjiArai 0:5b88d5760320 4141 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_read_round_two", ret );
kenjiArai 0:5b88d5760320 4142 return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
kenjiArai 0:5b88d5760320 4143 }
kenjiArai 0:5b88d5760320 4144
kenjiArai 0:5b88d5760320 4145 ret = mbedtls_ecjpake_derive_secret( &ssl->handshake->ecjpake_ctx,
kenjiArai 0:5b88d5760320 4146 ssl->handshake->premaster, 32, &ssl->handshake->pmslen,
kenjiArai 0:5b88d5760320 4147 ssl->conf->f_rng, ssl->conf->p_rng );
kenjiArai 0:5b88d5760320 4148 if( ret != 0 )
kenjiArai 0:5b88d5760320 4149 {
kenjiArai 0:5b88d5760320 4150 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_derive_secret", ret );
kenjiArai 0:5b88d5760320 4151 return( ret );
kenjiArai 0:5b88d5760320 4152 }
kenjiArai 0:5b88d5760320 4153 }
kenjiArai 0:5b88d5760320 4154 else
kenjiArai 0:5b88d5760320 4155 #endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
kenjiArai 0:5b88d5760320 4156 {
kenjiArai 0:5b88d5760320 4157 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
kenjiArai 0:5b88d5760320 4158 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
kenjiArai 0:5b88d5760320 4159 }
kenjiArai 0:5b88d5760320 4160
kenjiArai 0:5b88d5760320 4161 if( ( ret = mbedtls_ssl_derive_keys( ssl ) ) != 0 )
kenjiArai 0:5b88d5760320 4162 {
kenjiArai 0:5b88d5760320 4163 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_derive_keys", ret );
kenjiArai 0:5b88d5760320 4164 return( ret );
kenjiArai 0:5b88d5760320 4165 }
kenjiArai 0:5b88d5760320 4166
kenjiArai 0:5b88d5760320 4167 ssl->state++;
kenjiArai 0:5b88d5760320 4168
kenjiArai 0:5b88d5760320 4169 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse client key exchange" ) );
kenjiArai 0:5b88d5760320 4170
kenjiArai 0:5b88d5760320 4171 return( 0 );
kenjiArai 0:5b88d5760320 4172 }
kenjiArai 0:5b88d5760320 4173
kenjiArai 0:5b88d5760320 4174 #if !defined(MBEDTLS_KEY_EXCHANGE__CERT_REQ_ALLOWED__ENABLED)
kenjiArai 0:5b88d5760320 4175 static int ssl_parse_certificate_verify( mbedtls_ssl_context *ssl )
kenjiArai 0:5b88d5760320 4176 {
kenjiArai 0:5b88d5760320 4177 const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
kenjiArai 0:5b88d5760320 4178 ssl->handshake->ciphersuite_info;
kenjiArai 0:5b88d5760320 4179
kenjiArai 0:5b88d5760320 4180 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate verify" ) );
kenjiArai 0:5b88d5760320 4181
kenjiArai 0:5b88d5760320 4182 if( !mbedtls_ssl_ciphersuite_cert_req_allowed( ciphersuite_info ) )
kenjiArai 0:5b88d5760320 4183 {
kenjiArai 0:5b88d5760320 4184 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate verify" ) );
kenjiArai 0:5b88d5760320 4185 ssl->state++;
kenjiArai 0:5b88d5760320 4186 return( 0 );
kenjiArai 0:5b88d5760320 4187 }
kenjiArai 0:5b88d5760320 4188
kenjiArai 0:5b88d5760320 4189 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
kenjiArai 0:5b88d5760320 4190 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
kenjiArai 0:5b88d5760320 4191 }
kenjiArai 0:5b88d5760320 4192 #else /* !MBEDTLS_KEY_EXCHANGE__CERT_REQ_ALLOWED__ENABLED */
kenjiArai 0:5b88d5760320 4193 static int ssl_parse_certificate_verify( mbedtls_ssl_context *ssl )
kenjiArai 0:5b88d5760320 4194 {
kenjiArai 0:5b88d5760320 4195 int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
kenjiArai 0:5b88d5760320 4196 size_t i, sig_len;
kenjiArai 0:5b88d5760320 4197 unsigned char hash[48];
kenjiArai 0:5b88d5760320 4198 unsigned char *hash_start = hash;
kenjiArai 0:5b88d5760320 4199 size_t hashlen;
kenjiArai 0:5b88d5760320 4200 #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
kenjiArai 0:5b88d5760320 4201 mbedtls_pk_type_t pk_alg;
kenjiArai 0:5b88d5760320 4202 #endif
kenjiArai 0:5b88d5760320 4203 mbedtls_md_type_t md_alg;
kenjiArai 0:5b88d5760320 4204 const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
kenjiArai 0:5b88d5760320 4205 ssl->handshake->ciphersuite_info;
kenjiArai 0:5b88d5760320 4206 mbedtls_pk_context * peer_pk;
kenjiArai 0:5b88d5760320 4207
kenjiArai 0:5b88d5760320 4208 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate verify" ) );
kenjiArai 0:5b88d5760320 4209
kenjiArai 0:5b88d5760320 4210 if( !mbedtls_ssl_ciphersuite_cert_req_allowed( ciphersuite_info ) )
kenjiArai 0:5b88d5760320 4211 {
kenjiArai 0:5b88d5760320 4212 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate verify" ) );
kenjiArai 0:5b88d5760320 4213 ssl->state++;
kenjiArai 0:5b88d5760320 4214 return( 0 );
kenjiArai 0:5b88d5760320 4215 }
kenjiArai 0:5b88d5760320 4216
kenjiArai 0:5b88d5760320 4217 #if defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
kenjiArai 0:5b88d5760320 4218 if( ssl->session_negotiate->peer_cert == NULL )
kenjiArai 0:5b88d5760320 4219 {
kenjiArai 0:5b88d5760320 4220 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate verify" ) );
kenjiArai 0:5b88d5760320 4221 ssl->state++;
kenjiArai 0:5b88d5760320 4222 return( 0 );
kenjiArai 0:5b88d5760320 4223 }
kenjiArai 0:5b88d5760320 4224 #else /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
kenjiArai 0:5b88d5760320 4225 if( ssl->session_negotiate->peer_cert_digest == NULL )
kenjiArai 0:5b88d5760320 4226 {
kenjiArai 0:5b88d5760320 4227 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate verify" ) );
kenjiArai 0:5b88d5760320 4228 ssl->state++;
kenjiArai 0:5b88d5760320 4229 return( 0 );
kenjiArai 0:5b88d5760320 4230 }
kenjiArai 0:5b88d5760320 4231 #endif /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
kenjiArai 0:5b88d5760320 4232
kenjiArai 0:5b88d5760320 4233 /* Read the message without adding it to the checksum */
kenjiArai 0:5b88d5760320 4234 ret = mbedtls_ssl_read_record( ssl, 0 /* no checksum update */ );
kenjiArai 0:5b88d5760320 4235 if( 0 != ret )
kenjiArai 0:5b88d5760320 4236 {
kenjiArai 0:5b88d5760320 4237 MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ssl_read_record" ), ret );
kenjiArai 0:5b88d5760320 4238 return( ret );
kenjiArai 0:5b88d5760320 4239 }
kenjiArai 0:5b88d5760320 4240
kenjiArai 0:5b88d5760320 4241 ssl->state++;
kenjiArai 0:5b88d5760320 4242
kenjiArai 0:5b88d5760320 4243 /* Process the message contents */
kenjiArai 0:5b88d5760320 4244 if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE ||
kenjiArai 0:5b88d5760320 4245 ssl->in_msg[0] != MBEDTLS_SSL_HS_CERTIFICATE_VERIFY )
kenjiArai 0:5b88d5760320 4246 {
kenjiArai 0:5b88d5760320 4247 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) );
kenjiArai 0:5b88d5760320 4248 return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY );
kenjiArai 0:5b88d5760320 4249 }
kenjiArai 0:5b88d5760320 4250
kenjiArai 0:5b88d5760320 4251 i = mbedtls_ssl_hs_hdr_len( ssl );
kenjiArai 0:5b88d5760320 4252
kenjiArai 0:5b88d5760320 4253 #if !defined(MBEDTLS_SSL_KEEP_PEER_CERTIFICATE)
kenjiArai 0:5b88d5760320 4254 peer_pk = &ssl->handshake->peer_pubkey;
kenjiArai 0:5b88d5760320 4255 #else /* !MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
kenjiArai 0:5b88d5760320 4256 if( ssl->session_negotiate->peer_cert == NULL )
kenjiArai 0:5b88d5760320 4257 {
kenjiArai 0:5b88d5760320 4258 /* Should never happen */
kenjiArai 0:5b88d5760320 4259 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
kenjiArai 0:5b88d5760320 4260 }
kenjiArai 0:5b88d5760320 4261 peer_pk = &ssl->session_negotiate->peer_cert->pk;
kenjiArai 0:5b88d5760320 4262 #endif /* MBEDTLS_SSL_KEEP_PEER_CERTIFICATE */
kenjiArai 0:5b88d5760320 4263
kenjiArai 0:5b88d5760320 4264 /*
kenjiArai 0:5b88d5760320 4265 * struct {
kenjiArai 0:5b88d5760320 4266 * SignatureAndHashAlgorithm algorithm; -- TLS 1.2 only
kenjiArai 0:5b88d5760320 4267 * opaque signature<0..2^16-1>;
kenjiArai 0:5b88d5760320 4268 * } DigitallySigned;
kenjiArai 0:5b88d5760320 4269 */
kenjiArai 0:5b88d5760320 4270 #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
kenjiArai 0:5b88d5760320 4271 defined(MBEDTLS_SSL_PROTO_TLS1_1)
kenjiArai 0:5b88d5760320 4272 if( ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_3 )
kenjiArai 0:5b88d5760320 4273 {
kenjiArai 0:5b88d5760320 4274 md_alg = MBEDTLS_MD_NONE;
kenjiArai 0:5b88d5760320 4275 hashlen = 36;
kenjiArai 0:5b88d5760320 4276
kenjiArai 0:5b88d5760320 4277 /* For ECDSA, use SHA-1, not MD-5 + SHA-1 */
kenjiArai 0:5b88d5760320 4278 if( mbedtls_pk_can_do( peer_pk, MBEDTLS_PK_ECDSA ) )
kenjiArai 0:5b88d5760320 4279 {
kenjiArai 0:5b88d5760320 4280 hash_start += 16;
kenjiArai 0:5b88d5760320 4281 hashlen -= 16;
kenjiArai 0:5b88d5760320 4282 md_alg = MBEDTLS_MD_SHA1;
kenjiArai 0:5b88d5760320 4283 }
kenjiArai 0:5b88d5760320 4284 }
kenjiArai 0:5b88d5760320 4285 else
kenjiArai 0:5b88d5760320 4286 #endif /* MBEDTLS_SSL_PROTO_SSL3 || MBEDTLS_SSL_PROTO_TLS1 ||
kenjiArai 0:5b88d5760320 4287 MBEDTLS_SSL_PROTO_TLS1_1 */
kenjiArai 0:5b88d5760320 4288 #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
kenjiArai 0:5b88d5760320 4289 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
kenjiArai 0:5b88d5760320 4290 {
kenjiArai 0:5b88d5760320 4291 if( i + 2 > ssl->in_hslen )
kenjiArai 0:5b88d5760320 4292 {
kenjiArai 0:5b88d5760320 4293 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) );
kenjiArai 0:5b88d5760320 4294 return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY );
kenjiArai 0:5b88d5760320 4295 }
kenjiArai 0:5b88d5760320 4296
kenjiArai 0:5b88d5760320 4297 /*
kenjiArai 0:5b88d5760320 4298 * Hash
kenjiArai 0:5b88d5760320 4299 */
kenjiArai 0:5b88d5760320 4300 md_alg = mbedtls_ssl_md_alg_from_hash( ssl->in_msg[i] );
kenjiArai 0:5b88d5760320 4301
kenjiArai 0:5b88d5760320 4302 if( md_alg == MBEDTLS_MD_NONE || mbedtls_ssl_set_calc_verify_md( ssl, ssl->in_msg[i] ) )
kenjiArai 0:5b88d5760320 4303 {
kenjiArai 0:5b88d5760320 4304 MBEDTLS_SSL_DEBUG_MSG( 1, ( "peer not adhering to requested sig_alg"
kenjiArai 0:5b88d5760320 4305 " for verify message" ) );
kenjiArai 0:5b88d5760320 4306 return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY );
kenjiArai 0:5b88d5760320 4307 }
kenjiArai 0:5b88d5760320 4308
kenjiArai 0:5b88d5760320 4309 #if !defined(MBEDTLS_MD_SHA1)
kenjiArai 0:5b88d5760320 4310 if( MBEDTLS_MD_SHA1 == md_alg )
kenjiArai 0:5b88d5760320 4311 hash_start += 16;
kenjiArai 0:5b88d5760320 4312 #endif
kenjiArai 0:5b88d5760320 4313
kenjiArai 0:5b88d5760320 4314 /* Info from md_alg will be used instead */
kenjiArai 0:5b88d5760320 4315 hashlen = 0;
kenjiArai 0:5b88d5760320 4316
kenjiArai 0:5b88d5760320 4317 i++;
kenjiArai 0:5b88d5760320 4318
kenjiArai 0:5b88d5760320 4319 /*
kenjiArai 0:5b88d5760320 4320 * Signature
kenjiArai 0:5b88d5760320 4321 */
kenjiArai 0:5b88d5760320 4322 if( ( pk_alg = mbedtls_ssl_pk_alg_from_sig( ssl->in_msg[i] ) )
kenjiArai 0:5b88d5760320 4323 == MBEDTLS_PK_NONE )
kenjiArai 0:5b88d5760320 4324 {
kenjiArai 0:5b88d5760320 4325 MBEDTLS_SSL_DEBUG_MSG( 1, ( "peer not adhering to requested sig_alg"
kenjiArai 0:5b88d5760320 4326 " for verify message" ) );
kenjiArai 0:5b88d5760320 4327 return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY );
kenjiArai 0:5b88d5760320 4328 }
kenjiArai 0:5b88d5760320 4329
kenjiArai 0:5b88d5760320 4330 /*
kenjiArai 0:5b88d5760320 4331 * Check the certificate's key type matches the signature alg
kenjiArai 0:5b88d5760320 4332 */
kenjiArai 0:5b88d5760320 4333 if( !mbedtls_pk_can_do( peer_pk, pk_alg ) )
kenjiArai 0:5b88d5760320 4334 {
kenjiArai 0:5b88d5760320 4335 MBEDTLS_SSL_DEBUG_MSG( 1, ( "sig_alg doesn't match cert key" ) );
kenjiArai 0:5b88d5760320 4336 return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY );
kenjiArai 0:5b88d5760320 4337 }
kenjiArai 0:5b88d5760320 4338
kenjiArai 0:5b88d5760320 4339 i++;
kenjiArai 0:5b88d5760320 4340 }
kenjiArai 0:5b88d5760320 4341 else
kenjiArai 0:5b88d5760320 4342 #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
kenjiArai 0:5b88d5760320 4343 {
kenjiArai 0:5b88d5760320 4344 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
kenjiArai 0:5b88d5760320 4345 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
kenjiArai 0:5b88d5760320 4346 }
kenjiArai 0:5b88d5760320 4347
kenjiArai 0:5b88d5760320 4348 if( i + 2 > ssl->in_hslen )
kenjiArai 0:5b88d5760320 4349 {
kenjiArai 0:5b88d5760320 4350 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) );
kenjiArai 0:5b88d5760320 4351 return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY );
kenjiArai 0:5b88d5760320 4352 }
kenjiArai 0:5b88d5760320 4353
kenjiArai 0:5b88d5760320 4354 sig_len = ( ssl->in_msg[i] << 8 ) | ssl->in_msg[i+1];
kenjiArai 0:5b88d5760320 4355 i += 2;
kenjiArai 0:5b88d5760320 4356
kenjiArai 0:5b88d5760320 4357 if( i + sig_len != ssl->in_hslen )
kenjiArai 0:5b88d5760320 4358 {
kenjiArai 0:5b88d5760320 4359 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate verify message" ) );
kenjiArai 0:5b88d5760320 4360 return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_VERIFY );
kenjiArai 0:5b88d5760320 4361 }
kenjiArai 0:5b88d5760320 4362
kenjiArai 0:5b88d5760320 4363 /* Calculate hash and verify signature */
kenjiArai 1:9db0e321a9f4 4364 {
kenjiArai 1:9db0e321a9f4 4365 size_t dummy_hlen;
kenjiArai 1:9db0e321a9f4 4366 ssl->handshake->calc_verify( ssl, hash, &dummy_hlen );
kenjiArai 1:9db0e321a9f4 4367 }
kenjiArai 0:5b88d5760320 4368
kenjiArai 0:5b88d5760320 4369 if( ( ret = mbedtls_pk_verify( peer_pk,
kenjiArai 0:5b88d5760320 4370 md_alg, hash_start, hashlen,
kenjiArai 0:5b88d5760320 4371 ssl->in_msg + i, sig_len ) ) != 0 )
kenjiArai 0:5b88d5760320 4372 {
kenjiArai 0:5b88d5760320 4373 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_pk_verify", ret );
kenjiArai 0:5b88d5760320 4374 return( ret );
kenjiArai 0:5b88d5760320 4375 }
kenjiArai 0:5b88d5760320 4376
kenjiArai 0:5b88d5760320 4377 mbedtls_ssl_update_handshake_status( ssl );
kenjiArai 0:5b88d5760320 4378
kenjiArai 0:5b88d5760320 4379 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse certificate verify" ) );
kenjiArai 0:5b88d5760320 4380
kenjiArai 0:5b88d5760320 4381 return( ret );
kenjiArai 0:5b88d5760320 4382 }
kenjiArai 0:5b88d5760320 4383 #endif /* MBEDTLS_KEY_EXCHANGE__CERT_REQ_ALLOWED__ENABLED */
kenjiArai 0:5b88d5760320 4384
kenjiArai 0:5b88d5760320 4385 #if defined(MBEDTLS_SSL_SESSION_TICKETS)
kenjiArai 0:5b88d5760320 4386 static int ssl_write_new_session_ticket( mbedtls_ssl_context *ssl )
kenjiArai 0:5b88d5760320 4387 {
kenjiArai 0:5b88d5760320 4388 int ret;
kenjiArai 0:5b88d5760320 4389 size_t tlen;
kenjiArai 0:5b88d5760320 4390 uint32_t lifetime;
kenjiArai 0:5b88d5760320 4391
kenjiArai 0:5b88d5760320 4392 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write new session ticket" ) );
kenjiArai 0:5b88d5760320 4393
kenjiArai 0:5b88d5760320 4394 ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
kenjiArai 0:5b88d5760320 4395 ssl->out_msg[0] = MBEDTLS_SSL_HS_NEW_SESSION_TICKET;
kenjiArai 0:5b88d5760320 4396
kenjiArai 0:5b88d5760320 4397 /*
kenjiArai 0:5b88d5760320 4398 * struct {
kenjiArai 0:5b88d5760320 4399 * uint32 ticket_lifetime_hint;
kenjiArai 0:5b88d5760320 4400 * opaque ticket<0..2^16-1>;
kenjiArai 0:5b88d5760320 4401 * } NewSessionTicket;
kenjiArai 0:5b88d5760320 4402 *
kenjiArai 0:5b88d5760320 4403 * 4 . 7 ticket_lifetime_hint (0 = unspecified)
kenjiArai 0:5b88d5760320 4404 * 8 . 9 ticket_len (n)
kenjiArai 0:5b88d5760320 4405 * 10 . 9+n ticket content
kenjiArai 0:5b88d5760320 4406 */
kenjiArai 0:5b88d5760320 4407
kenjiArai 0:5b88d5760320 4408 if( ( ret = ssl->conf->f_ticket_write( ssl->conf->p_ticket,
kenjiArai 0:5b88d5760320 4409 ssl->session_negotiate,
kenjiArai 0:5b88d5760320 4410 ssl->out_msg + 10,
kenjiArai 0:5b88d5760320 4411 ssl->out_msg + MBEDTLS_SSL_OUT_CONTENT_LEN,
kenjiArai 0:5b88d5760320 4412 &tlen, &lifetime ) ) != 0 )
kenjiArai 0:5b88d5760320 4413 {
kenjiArai 0:5b88d5760320 4414 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_ticket_write", ret );
kenjiArai 0:5b88d5760320 4415 tlen = 0;
kenjiArai 0:5b88d5760320 4416 }
kenjiArai 0:5b88d5760320 4417
kenjiArai 0:5b88d5760320 4418 ssl->out_msg[4] = ( lifetime >> 24 ) & 0xFF;
kenjiArai 0:5b88d5760320 4419 ssl->out_msg[5] = ( lifetime >> 16 ) & 0xFF;
kenjiArai 0:5b88d5760320 4420 ssl->out_msg[6] = ( lifetime >> 8 ) & 0xFF;
kenjiArai 0:5b88d5760320 4421 ssl->out_msg[7] = ( lifetime ) & 0xFF;
kenjiArai 0:5b88d5760320 4422
kenjiArai 0:5b88d5760320 4423 ssl->out_msg[8] = (unsigned char)( ( tlen >> 8 ) & 0xFF );
kenjiArai 0:5b88d5760320 4424 ssl->out_msg[9] = (unsigned char)( ( tlen ) & 0xFF );
kenjiArai 0:5b88d5760320 4425
kenjiArai 0:5b88d5760320 4426 ssl->out_msglen = 10 + tlen;
kenjiArai 0:5b88d5760320 4427
kenjiArai 0:5b88d5760320 4428 /*
kenjiArai 0:5b88d5760320 4429 * Morally equivalent to updating ssl->state, but NewSessionTicket and
kenjiArai 0:5b88d5760320 4430 * ChangeCipherSpec share the same state.
kenjiArai 0:5b88d5760320 4431 */
kenjiArai 0:5b88d5760320 4432 ssl->handshake->new_session_ticket = 0;
kenjiArai 0:5b88d5760320 4433
kenjiArai 0:5b88d5760320 4434 if( ( ret = mbedtls_ssl_write_handshake_msg( ssl ) ) != 0 )
kenjiArai 0:5b88d5760320 4435 {
kenjiArai 0:5b88d5760320 4436 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_handshake_msg", ret );
kenjiArai 0:5b88d5760320 4437 return( ret );
kenjiArai 0:5b88d5760320 4438 }
kenjiArai 0:5b88d5760320 4439
kenjiArai 0:5b88d5760320 4440 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write new session ticket" ) );
kenjiArai 0:5b88d5760320 4441
kenjiArai 0:5b88d5760320 4442 return( 0 );
kenjiArai 0:5b88d5760320 4443 }
kenjiArai 0:5b88d5760320 4444 #endif /* MBEDTLS_SSL_SESSION_TICKETS */
kenjiArai 0:5b88d5760320 4445
kenjiArai 0:5b88d5760320 4446 /*
kenjiArai 0:5b88d5760320 4447 * SSL handshake -- server side -- single step
kenjiArai 0:5b88d5760320 4448 */
kenjiArai 0:5b88d5760320 4449 int mbedtls_ssl_handshake_server_step( mbedtls_ssl_context *ssl )
kenjiArai 0:5b88d5760320 4450 {
kenjiArai 0:5b88d5760320 4451 int ret = 0;
kenjiArai 0:5b88d5760320 4452
kenjiArai 0:5b88d5760320 4453 if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER || ssl->handshake == NULL )
kenjiArai 0:5b88d5760320 4454 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
kenjiArai 0:5b88d5760320 4455
kenjiArai 0:5b88d5760320 4456 MBEDTLS_SSL_DEBUG_MSG( 2, ( "server state: %d", ssl->state ) );
kenjiArai 0:5b88d5760320 4457
kenjiArai 0:5b88d5760320 4458 if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 )
kenjiArai 0:5b88d5760320 4459 return( ret );
kenjiArai 0:5b88d5760320 4460
kenjiArai 0:5b88d5760320 4461 #if defined(MBEDTLS_SSL_PROTO_DTLS)
kenjiArai 0:5b88d5760320 4462 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
kenjiArai 0:5b88d5760320 4463 ssl->handshake->retransmit_state == MBEDTLS_SSL_RETRANS_SENDING )
kenjiArai 0:5b88d5760320 4464 {
kenjiArai 0:5b88d5760320 4465 if( ( ret = mbedtls_ssl_flight_transmit( ssl ) ) != 0 )
kenjiArai 0:5b88d5760320 4466 return( ret );
kenjiArai 0:5b88d5760320 4467 }
kenjiArai 0:5b88d5760320 4468 #endif /* MBEDTLS_SSL_PROTO_DTLS */
kenjiArai 0:5b88d5760320 4469
kenjiArai 0:5b88d5760320 4470 switch( ssl->state )
kenjiArai 0:5b88d5760320 4471 {
kenjiArai 0:5b88d5760320 4472 case MBEDTLS_SSL_HELLO_REQUEST:
kenjiArai 0:5b88d5760320 4473 ssl->state = MBEDTLS_SSL_CLIENT_HELLO;
kenjiArai 0:5b88d5760320 4474 break;
kenjiArai 0:5b88d5760320 4475
kenjiArai 0:5b88d5760320 4476 /*
kenjiArai 0:5b88d5760320 4477 * <== ClientHello
kenjiArai 0:5b88d5760320 4478 */
kenjiArai 0:5b88d5760320 4479 case MBEDTLS_SSL_CLIENT_HELLO:
kenjiArai 0:5b88d5760320 4480 ret = ssl_parse_client_hello( ssl );
kenjiArai 0:5b88d5760320 4481 break;
kenjiArai 0:5b88d5760320 4482
kenjiArai 0:5b88d5760320 4483 #if defined(MBEDTLS_SSL_PROTO_DTLS)
kenjiArai 0:5b88d5760320 4484 case MBEDTLS_SSL_SERVER_HELLO_VERIFY_REQUEST_SENT:
kenjiArai 0:5b88d5760320 4485 return( MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED );
kenjiArai 0:5b88d5760320 4486 #endif
kenjiArai 0:5b88d5760320 4487
kenjiArai 0:5b88d5760320 4488 /*
kenjiArai 0:5b88d5760320 4489 * ==> ServerHello
kenjiArai 0:5b88d5760320 4490 * Certificate
kenjiArai 0:5b88d5760320 4491 * ( ServerKeyExchange )
kenjiArai 0:5b88d5760320 4492 * ( CertificateRequest )
kenjiArai 0:5b88d5760320 4493 * ServerHelloDone
kenjiArai 0:5b88d5760320 4494 */
kenjiArai 0:5b88d5760320 4495 case MBEDTLS_SSL_SERVER_HELLO:
kenjiArai 0:5b88d5760320 4496 ret = ssl_write_server_hello( ssl );
kenjiArai 0:5b88d5760320 4497 break;
kenjiArai 0:5b88d5760320 4498
kenjiArai 0:5b88d5760320 4499 case MBEDTLS_SSL_SERVER_CERTIFICATE:
kenjiArai 0:5b88d5760320 4500 ret = mbedtls_ssl_write_certificate( ssl );
kenjiArai 0:5b88d5760320 4501 break;
kenjiArai 0:5b88d5760320 4502
kenjiArai 0:5b88d5760320 4503 case MBEDTLS_SSL_SERVER_KEY_EXCHANGE:
kenjiArai 0:5b88d5760320 4504 ret = ssl_write_server_key_exchange( ssl );
kenjiArai 0:5b88d5760320 4505 break;
kenjiArai 0:5b88d5760320 4506
kenjiArai 0:5b88d5760320 4507 case MBEDTLS_SSL_CERTIFICATE_REQUEST:
kenjiArai 0:5b88d5760320 4508 ret = ssl_write_certificate_request( ssl );
kenjiArai 0:5b88d5760320 4509 break;
kenjiArai 0:5b88d5760320 4510
kenjiArai 0:5b88d5760320 4511 case MBEDTLS_SSL_SERVER_HELLO_DONE:
kenjiArai 0:5b88d5760320 4512 ret = ssl_write_server_hello_done( ssl );
kenjiArai 0:5b88d5760320 4513 break;
kenjiArai 0:5b88d5760320 4514
kenjiArai 0:5b88d5760320 4515 /*
kenjiArai 0:5b88d5760320 4516 * <== ( Certificate/Alert )
kenjiArai 0:5b88d5760320 4517 * ClientKeyExchange
kenjiArai 0:5b88d5760320 4518 * ( CertificateVerify )
kenjiArai 0:5b88d5760320 4519 * ChangeCipherSpec
kenjiArai 0:5b88d5760320 4520 * Finished
kenjiArai 0:5b88d5760320 4521 */
kenjiArai 0:5b88d5760320 4522 case MBEDTLS_SSL_CLIENT_CERTIFICATE:
kenjiArai 0:5b88d5760320 4523 ret = mbedtls_ssl_parse_certificate( ssl );
kenjiArai 0:5b88d5760320 4524 break;
kenjiArai 0:5b88d5760320 4525
kenjiArai 0:5b88d5760320 4526 case MBEDTLS_SSL_CLIENT_KEY_EXCHANGE:
kenjiArai 0:5b88d5760320 4527 ret = ssl_parse_client_key_exchange( ssl );
kenjiArai 0:5b88d5760320 4528 break;
kenjiArai 0:5b88d5760320 4529
kenjiArai 0:5b88d5760320 4530 case MBEDTLS_SSL_CERTIFICATE_VERIFY:
kenjiArai 0:5b88d5760320 4531 ret = ssl_parse_certificate_verify( ssl );
kenjiArai 0:5b88d5760320 4532 break;
kenjiArai 0:5b88d5760320 4533
kenjiArai 0:5b88d5760320 4534 case MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC:
kenjiArai 0:5b88d5760320 4535 ret = mbedtls_ssl_parse_change_cipher_spec( ssl );
kenjiArai 0:5b88d5760320 4536 break;
kenjiArai 0:5b88d5760320 4537
kenjiArai 0:5b88d5760320 4538 case MBEDTLS_SSL_CLIENT_FINISHED:
kenjiArai 0:5b88d5760320 4539 ret = mbedtls_ssl_parse_finished( ssl );
kenjiArai 0:5b88d5760320 4540 break;
kenjiArai 0:5b88d5760320 4541
kenjiArai 0:5b88d5760320 4542 /*
kenjiArai 0:5b88d5760320 4543 * ==> ( NewSessionTicket )
kenjiArai 0:5b88d5760320 4544 * ChangeCipherSpec
kenjiArai 0:5b88d5760320 4545 * Finished
kenjiArai 0:5b88d5760320 4546 */
kenjiArai 0:5b88d5760320 4547 case MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC:
kenjiArai 0:5b88d5760320 4548 #if defined(MBEDTLS_SSL_SESSION_TICKETS)
kenjiArai 0:5b88d5760320 4549 if( ssl->handshake->new_session_ticket != 0 )
kenjiArai 0:5b88d5760320 4550 ret = ssl_write_new_session_ticket( ssl );
kenjiArai 0:5b88d5760320 4551 else
kenjiArai 0:5b88d5760320 4552 #endif
kenjiArai 0:5b88d5760320 4553 ret = mbedtls_ssl_write_change_cipher_spec( ssl );
kenjiArai 0:5b88d5760320 4554 break;
kenjiArai 0:5b88d5760320 4555
kenjiArai 0:5b88d5760320 4556 case MBEDTLS_SSL_SERVER_FINISHED:
kenjiArai 0:5b88d5760320 4557 ret = mbedtls_ssl_write_finished( ssl );
kenjiArai 0:5b88d5760320 4558 break;
kenjiArai 0:5b88d5760320 4559
kenjiArai 0:5b88d5760320 4560 case MBEDTLS_SSL_FLUSH_BUFFERS:
kenjiArai 0:5b88d5760320 4561 MBEDTLS_SSL_DEBUG_MSG( 2, ( "handshake: done" ) );
kenjiArai 0:5b88d5760320 4562 ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP;
kenjiArai 0:5b88d5760320 4563 break;
kenjiArai 0:5b88d5760320 4564
kenjiArai 0:5b88d5760320 4565 case MBEDTLS_SSL_HANDSHAKE_WRAPUP:
kenjiArai 0:5b88d5760320 4566 mbedtls_ssl_handshake_wrapup( ssl );
kenjiArai 0:5b88d5760320 4567 break;
kenjiArai 0:5b88d5760320 4568
kenjiArai 0:5b88d5760320 4569 default:
kenjiArai 0:5b88d5760320 4570 MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid state %d", ssl->state ) );
kenjiArai 0:5b88d5760320 4571 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
kenjiArai 0:5b88d5760320 4572 }
kenjiArai 0:5b88d5760320 4573
kenjiArai 0:5b88d5760320 4574 return( ret );
kenjiArai 0:5b88d5760320 4575 }
kenjiArai 0:5b88d5760320 4576 #endif /* MBEDTLS_SSL_SRV_C */