Rahul Dahiya / Mbed OS STM32F7 Ethernet

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mbed-os/features/mbedtls/src/ssl_cli.c@0:fb8047b156bb, 2020-01-15 (annotated)

Committer:
rahul_dahiya
Date:
Wed Jan 15 15:57:15 2020 +0530
Revision:
0:fb8047b156bb
STM32F7 LWIP

Who changed what in which revision?

UserRevisionLine numberNew contents of line
rahul_dahiya 0:fb8047b156bb 1 /*
rahul_dahiya 0:fb8047b156bb 2 * SSLv3/TLSv1 client-side functions
rahul_dahiya 0:fb8047b156bb 3 *
rahul_dahiya 0:fb8047b156bb 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
rahul_dahiya 0:fb8047b156bb 5 * SPDX-License-Identifier: Apache-2.0
rahul_dahiya 0:fb8047b156bb 6 *
rahul_dahiya 0:fb8047b156bb 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
rahul_dahiya 0:fb8047b156bb 8 * not use this file except in compliance with the License.
rahul_dahiya 0:fb8047b156bb 9 * You may obtain a copy of the License at
rahul_dahiya 0:fb8047b156bb 10 *
rahul_dahiya 0:fb8047b156bb 11 * http://www.apache.org/licenses/LICENSE-2.0
rahul_dahiya 0:fb8047b156bb 12 *
rahul_dahiya 0:fb8047b156bb 13 * Unless required by applicable law or agreed to in writing, software
rahul_dahiya 0:fb8047b156bb 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
rahul_dahiya 0:fb8047b156bb 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
rahul_dahiya 0:fb8047b156bb 16 * See the License for the specific language governing permissions and
rahul_dahiya 0:fb8047b156bb 17 * limitations under the License.
rahul_dahiya 0:fb8047b156bb 18 *
rahul_dahiya 0:fb8047b156bb 19 * This file is part of mbed TLS (https://tls.mbed.org)
rahul_dahiya 0:fb8047b156bb 20 */
rahul_dahiya 0:fb8047b156bb 21
rahul_dahiya 0:fb8047b156bb 22 #if !defined(MBEDTLS_CONFIG_FILE)
rahul_dahiya 0:fb8047b156bb 23 #include "mbedtls/config.h"
rahul_dahiya 0:fb8047b156bb 24 #else
rahul_dahiya 0:fb8047b156bb 25 #include MBEDTLS_CONFIG_FILE
rahul_dahiya 0:fb8047b156bb 26 #endif
rahul_dahiya 0:fb8047b156bb 27
rahul_dahiya 0:fb8047b156bb 28 #if defined(MBEDTLS_SSL_CLI_C)
rahul_dahiya 0:fb8047b156bb 29
rahul_dahiya 0:fb8047b156bb 30 #if defined(MBEDTLS_PLATFORM_C)
rahul_dahiya 0:fb8047b156bb 31 #include "mbedtls/platform.h"
rahul_dahiya 0:fb8047b156bb 32 #else
rahul_dahiya 0:fb8047b156bb 33 #include <stdlib.h>
rahul_dahiya 0:fb8047b156bb 34 #define mbedtls_calloc calloc
rahul_dahiya 0:fb8047b156bb 35 #define mbedtls_free free
rahul_dahiya 0:fb8047b156bb 36 #endif
rahul_dahiya 0:fb8047b156bb 37
rahul_dahiya 0:fb8047b156bb 38 #include "mbedtls/debug.h"
rahul_dahiya 0:fb8047b156bb 39 #include "mbedtls/ssl.h"
rahul_dahiya 0:fb8047b156bb 40 #include "mbedtls/ssl_internal.h"
rahul_dahiya 0:fb8047b156bb 41
rahul_dahiya 0:fb8047b156bb 42 #include <string.h>
rahul_dahiya 0:fb8047b156bb 43
rahul_dahiya 0:fb8047b156bb 44 #include <stdint.h>
rahul_dahiya 0:fb8047b156bb 45
rahul_dahiya 0:fb8047b156bb 46 #if defined(MBEDTLS_HAVE_TIME)
rahul_dahiya 0:fb8047b156bb 47 #include "mbedtls/platform_time.h"
rahul_dahiya 0:fb8047b156bb 48 #endif
rahul_dahiya 0:fb8047b156bb 49
rahul_dahiya 0:fb8047b156bb 50 #if defined(MBEDTLS_SSL_SESSION_TICKETS)
rahul_dahiya 0:fb8047b156bb 51 /* Implementation that should never be optimized out by the compiler */
rahul_dahiya 0:fb8047b156bb 52 static void mbedtls_zeroize( void *v, size_t n ) {
rahul_dahiya 0:fb8047b156bb 53 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
rahul_dahiya 0:fb8047b156bb 54 }
rahul_dahiya 0:fb8047b156bb 55 #endif
rahul_dahiya 0:fb8047b156bb 56
rahul_dahiya 0:fb8047b156bb 57 #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
rahul_dahiya 0:fb8047b156bb 58 static void ssl_write_hostname_ext( mbedtls_ssl_context *ssl,
rahul_dahiya 0:fb8047b156bb 59 unsigned char *buf,
rahul_dahiya 0:fb8047b156bb 60 size_t *olen )
rahul_dahiya 0:fb8047b156bb 61 {
rahul_dahiya 0:fb8047b156bb 62 unsigned char *p = buf;
rahul_dahiya 0:fb8047b156bb 63 const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
rahul_dahiya 0:fb8047b156bb 64 size_t hostname_len;
rahul_dahiya 0:fb8047b156bb 65
rahul_dahiya 0:fb8047b156bb 66 *olen = 0;
rahul_dahiya 0:fb8047b156bb 67
rahul_dahiya 0:fb8047b156bb 68 if( ssl->hostname == NULL )
rahul_dahiya 0:fb8047b156bb 69 return;
rahul_dahiya 0:fb8047b156bb 70
rahul_dahiya 0:fb8047b156bb 71 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding server name extension: %s",
rahul_dahiya 0:fb8047b156bb 72 ssl->hostname ) );
rahul_dahiya 0:fb8047b156bb 73
rahul_dahiya 0:fb8047b156bb 74 hostname_len = strlen( ssl->hostname );
rahul_dahiya 0:fb8047b156bb 75
rahul_dahiya 0:fb8047b156bb 76 if( end < p || (size_t)( end - p ) < hostname_len + 9 )
rahul_dahiya 0:fb8047b156bb 77 {
rahul_dahiya 0:fb8047b156bb 78 MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
rahul_dahiya 0:fb8047b156bb 79 return;
rahul_dahiya 0:fb8047b156bb 80 }
rahul_dahiya 0:fb8047b156bb 81
rahul_dahiya 0:fb8047b156bb 82 /*
rahul_dahiya 0:fb8047b156bb 83 * struct {
rahul_dahiya 0:fb8047b156bb 84 * NameType name_type;
rahul_dahiya 0:fb8047b156bb 85 * select (name_type) {
rahul_dahiya 0:fb8047b156bb 86 * case host_name: HostName;
rahul_dahiya 0:fb8047b156bb 87 * } name;
rahul_dahiya 0:fb8047b156bb 88 * } ServerName;
rahul_dahiya 0:fb8047b156bb 89 *
rahul_dahiya 0:fb8047b156bb 90 * enum {
rahul_dahiya 0:fb8047b156bb 91 * host_name(0), (255)
rahul_dahiya 0:fb8047b156bb 92 * } NameType;
rahul_dahiya 0:fb8047b156bb 93 *
rahul_dahiya 0:fb8047b156bb 94 * opaque HostName<1..2^16-1>;
rahul_dahiya 0:fb8047b156bb 95 *
rahul_dahiya 0:fb8047b156bb 96 * struct {
rahul_dahiya 0:fb8047b156bb 97 * ServerName server_name_list<1..2^16-1>
rahul_dahiya 0:fb8047b156bb 98 * } ServerNameList;
rahul_dahiya 0:fb8047b156bb 99 */
rahul_dahiya 0:fb8047b156bb 100 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SERVERNAME >> 8 ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 101 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SERVERNAME ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 102
rahul_dahiya 0:fb8047b156bb 103 *p++ = (unsigned char)( ( (hostname_len + 5) >> 8 ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 104 *p++ = (unsigned char)( ( (hostname_len + 5) ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 105
rahul_dahiya 0:fb8047b156bb 106 *p++ = (unsigned char)( ( (hostname_len + 3) >> 8 ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 107 *p++ = (unsigned char)( ( (hostname_len + 3) ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 108
rahul_dahiya 0:fb8047b156bb 109 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SERVERNAME_HOSTNAME ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 110 *p++ = (unsigned char)( ( hostname_len >> 8 ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 111 *p++ = (unsigned char)( ( hostname_len ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 112
rahul_dahiya 0:fb8047b156bb 113 memcpy( p, ssl->hostname, hostname_len );
rahul_dahiya 0:fb8047b156bb 114
rahul_dahiya 0:fb8047b156bb 115 *olen = hostname_len + 9;
rahul_dahiya 0:fb8047b156bb 116 }
rahul_dahiya 0:fb8047b156bb 117 #endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
rahul_dahiya 0:fb8047b156bb 118
rahul_dahiya 0:fb8047b156bb 119 #if defined(MBEDTLS_SSL_RENEGOTIATION)
rahul_dahiya 0:fb8047b156bb 120 static void ssl_write_renegotiation_ext( mbedtls_ssl_context *ssl,
rahul_dahiya 0:fb8047b156bb 121 unsigned char *buf,
rahul_dahiya 0:fb8047b156bb 122 size_t *olen )
rahul_dahiya 0:fb8047b156bb 123 {
rahul_dahiya 0:fb8047b156bb 124 unsigned char *p = buf;
rahul_dahiya 0:fb8047b156bb 125 const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
rahul_dahiya 0:fb8047b156bb 126
rahul_dahiya 0:fb8047b156bb 127 *olen = 0;
rahul_dahiya 0:fb8047b156bb 128
rahul_dahiya 0:fb8047b156bb 129 if( ssl->renego_status != MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
rahul_dahiya 0:fb8047b156bb 130 return;
rahul_dahiya 0:fb8047b156bb 131
rahul_dahiya 0:fb8047b156bb 132 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding renegotiation extension" ) );
rahul_dahiya 0:fb8047b156bb 133
rahul_dahiya 0:fb8047b156bb 134 if( end < p || (size_t)( end - p ) < 5 + ssl->verify_data_len )
rahul_dahiya 0:fb8047b156bb 135 {
rahul_dahiya 0:fb8047b156bb 136 MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
rahul_dahiya 0:fb8047b156bb 137 return;
rahul_dahiya 0:fb8047b156bb 138 }
rahul_dahiya 0:fb8047b156bb 139
rahul_dahiya 0:fb8047b156bb 140 /*
rahul_dahiya 0:fb8047b156bb 141 * Secure renegotiation
rahul_dahiya 0:fb8047b156bb 142 */
rahul_dahiya 0:fb8047b156bb 143 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_RENEGOTIATION_INFO >> 8 ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 144 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_RENEGOTIATION_INFO ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 145
rahul_dahiya 0:fb8047b156bb 146 *p++ = 0x00;
rahul_dahiya 0:fb8047b156bb 147 *p++ = ( ssl->verify_data_len + 1 ) & 0xFF;
rahul_dahiya 0:fb8047b156bb 148 *p++ = ssl->verify_data_len & 0xFF;
rahul_dahiya 0:fb8047b156bb 149
rahul_dahiya 0:fb8047b156bb 150 memcpy( p, ssl->own_verify_data, ssl->verify_data_len );
rahul_dahiya 0:fb8047b156bb 151
rahul_dahiya 0:fb8047b156bb 152 *olen = 5 + ssl->verify_data_len;
rahul_dahiya 0:fb8047b156bb 153 }
rahul_dahiya 0:fb8047b156bb 154 #endif /* MBEDTLS_SSL_RENEGOTIATION */
rahul_dahiya 0:fb8047b156bb 155
rahul_dahiya 0:fb8047b156bb 156 /*
rahul_dahiya 0:fb8047b156bb 157 * Only if we handle at least one key exchange that needs signatures.
rahul_dahiya 0:fb8047b156bb 158 */
rahul_dahiya 0:fb8047b156bb 159 #if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
rahul_dahiya 0:fb8047b156bb 160 defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
rahul_dahiya 0:fb8047b156bb 161 static void ssl_write_signature_algorithms_ext( mbedtls_ssl_context *ssl,
rahul_dahiya 0:fb8047b156bb 162 unsigned char *buf,
rahul_dahiya 0:fb8047b156bb 163 size_t *olen )
rahul_dahiya 0:fb8047b156bb 164 {
rahul_dahiya 0:fb8047b156bb 165 unsigned char *p = buf;
rahul_dahiya 0:fb8047b156bb 166 const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
rahul_dahiya 0:fb8047b156bb 167 size_t sig_alg_len = 0;
rahul_dahiya 0:fb8047b156bb 168 const int *md;
rahul_dahiya 0:fb8047b156bb 169 #if defined(MBEDTLS_RSA_C) || defined(MBEDTLS_ECDSA_C)
rahul_dahiya 0:fb8047b156bb 170 unsigned char *sig_alg_list = buf + 6;
rahul_dahiya 0:fb8047b156bb 171 #endif
rahul_dahiya 0:fb8047b156bb 172
rahul_dahiya 0:fb8047b156bb 173 *olen = 0;
rahul_dahiya 0:fb8047b156bb 174
rahul_dahiya 0:fb8047b156bb 175 if( ssl->conf->max_minor_ver != MBEDTLS_SSL_MINOR_VERSION_3 )
rahul_dahiya 0:fb8047b156bb 176 return;
rahul_dahiya 0:fb8047b156bb 177
rahul_dahiya 0:fb8047b156bb 178 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding signature_algorithms extension" ) );
rahul_dahiya 0:fb8047b156bb 179
rahul_dahiya 0:fb8047b156bb 180 for( md = ssl->conf->sig_hashes; *md != MBEDTLS_MD_NONE; md++ )
rahul_dahiya 0:fb8047b156bb 181 {
rahul_dahiya 0:fb8047b156bb 182 #if defined(MBEDTLS_ECDSA_C)
rahul_dahiya 0:fb8047b156bb 183 sig_alg_len += 2;
rahul_dahiya 0:fb8047b156bb 184 #endif
rahul_dahiya 0:fb8047b156bb 185 #if defined(MBEDTLS_RSA_C)
rahul_dahiya 0:fb8047b156bb 186 sig_alg_len += 2;
rahul_dahiya 0:fb8047b156bb 187 #endif
rahul_dahiya 0:fb8047b156bb 188 }
rahul_dahiya 0:fb8047b156bb 189
rahul_dahiya 0:fb8047b156bb 190 if( end < p || (size_t)( end - p ) < sig_alg_len + 6 )
rahul_dahiya 0:fb8047b156bb 191 {
rahul_dahiya 0:fb8047b156bb 192 MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
rahul_dahiya 0:fb8047b156bb 193 return;
rahul_dahiya 0:fb8047b156bb 194 }
rahul_dahiya 0:fb8047b156bb 195
rahul_dahiya 0:fb8047b156bb 196 /*
rahul_dahiya 0:fb8047b156bb 197 * Prepare signature_algorithms extension (TLS 1.2)
rahul_dahiya 0:fb8047b156bb 198 */
rahul_dahiya 0:fb8047b156bb 199 sig_alg_len = 0;
rahul_dahiya 0:fb8047b156bb 200
rahul_dahiya 0:fb8047b156bb 201 for( md = ssl->conf->sig_hashes; *md != MBEDTLS_MD_NONE; md++ )
rahul_dahiya 0:fb8047b156bb 202 {
rahul_dahiya 0:fb8047b156bb 203 #if defined(MBEDTLS_ECDSA_C)
rahul_dahiya 0:fb8047b156bb 204 sig_alg_list[sig_alg_len++] = mbedtls_ssl_hash_from_md_alg( *md );
rahul_dahiya 0:fb8047b156bb 205 sig_alg_list[sig_alg_len++] = MBEDTLS_SSL_SIG_ECDSA;
rahul_dahiya 0:fb8047b156bb 206 #endif
rahul_dahiya 0:fb8047b156bb 207 #if defined(MBEDTLS_RSA_C)
rahul_dahiya 0:fb8047b156bb 208 sig_alg_list[sig_alg_len++] = mbedtls_ssl_hash_from_md_alg( *md );
rahul_dahiya 0:fb8047b156bb 209 sig_alg_list[sig_alg_len++] = MBEDTLS_SSL_SIG_RSA;
rahul_dahiya 0:fb8047b156bb 210 #endif
rahul_dahiya 0:fb8047b156bb 211 }
rahul_dahiya 0:fb8047b156bb 212
rahul_dahiya 0:fb8047b156bb 213 /*
rahul_dahiya 0:fb8047b156bb 214 * enum {
rahul_dahiya 0:fb8047b156bb 215 * none(0), md5(1), sha1(2), sha224(3), sha256(4), sha384(5),
rahul_dahiya 0:fb8047b156bb 216 * sha512(6), (255)
rahul_dahiya 0:fb8047b156bb 217 * } HashAlgorithm;
rahul_dahiya 0:fb8047b156bb 218 *
rahul_dahiya 0:fb8047b156bb 219 * enum { anonymous(0), rsa(1), dsa(2), ecdsa(3), (255) }
rahul_dahiya 0:fb8047b156bb 220 * SignatureAlgorithm;
rahul_dahiya 0:fb8047b156bb 221 *
rahul_dahiya 0:fb8047b156bb 222 * struct {
rahul_dahiya 0:fb8047b156bb 223 * HashAlgorithm hash;
rahul_dahiya 0:fb8047b156bb 224 * SignatureAlgorithm signature;
rahul_dahiya 0:fb8047b156bb 225 * } SignatureAndHashAlgorithm;
rahul_dahiya 0:fb8047b156bb 226 *
rahul_dahiya 0:fb8047b156bb 227 * SignatureAndHashAlgorithm
rahul_dahiya 0:fb8047b156bb 228 * supported_signature_algorithms<2..2^16-2>;
rahul_dahiya 0:fb8047b156bb 229 */
rahul_dahiya 0:fb8047b156bb 230 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SIG_ALG >> 8 ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 231 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SIG_ALG ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 232
rahul_dahiya 0:fb8047b156bb 233 *p++ = (unsigned char)( ( ( sig_alg_len + 2 ) >> 8 ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 234 *p++ = (unsigned char)( ( ( sig_alg_len + 2 ) ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 235
rahul_dahiya 0:fb8047b156bb 236 *p++ = (unsigned char)( ( sig_alg_len >> 8 ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 237 *p++ = (unsigned char)( ( sig_alg_len ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 238
rahul_dahiya 0:fb8047b156bb 239 *olen = 6 + sig_alg_len;
rahul_dahiya 0:fb8047b156bb 240 }
rahul_dahiya 0:fb8047b156bb 241 #endif /* MBEDTLS_SSL_PROTO_TLS1_2 &&
rahul_dahiya 0:fb8047b156bb 242 MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */
rahul_dahiya 0:fb8047b156bb 243
rahul_dahiya 0:fb8047b156bb 244 #if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \
rahul_dahiya 0:fb8047b156bb 245 defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
rahul_dahiya 0:fb8047b156bb 246 static void ssl_write_supported_elliptic_curves_ext( mbedtls_ssl_context *ssl,
rahul_dahiya 0:fb8047b156bb 247 unsigned char *buf,
rahul_dahiya 0:fb8047b156bb 248 size_t *olen )
rahul_dahiya 0:fb8047b156bb 249 {
rahul_dahiya 0:fb8047b156bb 250 unsigned char *p = buf;
rahul_dahiya 0:fb8047b156bb 251 const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
rahul_dahiya 0:fb8047b156bb 252 unsigned char *elliptic_curve_list = p + 6;
rahul_dahiya 0:fb8047b156bb 253 size_t elliptic_curve_len = 0;
rahul_dahiya 0:fb8047b156bb 254 const mbedtls_ecp_curve_info *info;
rahul_dahiya 0:fb8047b156bb 255 #if defined(MBEDTLS_ECP_C)
rahul_dahiya 0:fb8047b156bb 256 const mbedtls_ecp_group_id *grp_id;
rahul_dahiya 0:fb8047b156bb 257 #else
rahul_dahiya 0:fb8047b156bb 258 ((void) ssl);
rahul_dahiya 0:fb8047b156bb 259 #endif
rahul_dahiya 0:fb8047b156bb 260
rahul_dahiya 0:fb8047b156bb 261 *olen = 0;
rahul_dahiya 0:fb8047b156bb 262
rahul_dahiya 0:fb8047b156bb 263 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding supported_elliptic_curves extension" ) );
rahul_dahiya 0:fb8047b156bb 264
rahul_dahiya 0:fb8047b156bb 265 #if defined(MBEDTLS_ECP_C)
rahul_dahiya 0:fb8047b156bb 266 for( grp_id = ssl->conf->curve_list; *grp_id != MBEDTLS_ECP_DP_NONE; grp_id++ )
rahul_dahiya 0:fb8047b156bb 267 #else
rahul_dahiya 0:fb8047b156bb 268 for( info = mbedtls_ecp_curve_list(); info->grp_id != MBEDTLS_ECP_DP_NONE; info++ )
rahul_dahiya 0:fb8047b156bb 269 #endif
rahul_dahiya 0:fb8047b156bb 270 {
rahul_dahiya 0:fb8047b156bb 271 #if defined(MBEDTLS_ECP_C)
rahul_dahiya 0:fb8047b156bb 272 info = mbedtls_ecp_curve_info_from_grp_id( *grp_id );
rahul_dahiya 0:fb8047b156bb 273 #endif
rahul_dahiya 0:fb8047b156bb 274 if( info == NULL )
rahul_dahiya 0:fb8047b156bb 275 {
rahul_dahiya 0:fb8047b156bb 276 MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid curve in ssl configuration" ) );
rahul_dahiya 0:fb8047b156bb 277 return;
rahul_dahiya 0:fb8047b156bb 278 }
rahul_dahiya 0:fb8047b156bb 279
rahul_dahiya 0:fb8047b156bb 280 elliptic_curve_len += 2;
rahul_dahiya 0:fb8047b156bb 281 }
rahul_dahiya 0:fb8047b156bb 282
rahul_dahiya 0:fb8047b156bb 283 if( end < p || (size_t)( end - p ) < 6 + elliptic_curve_len )
rahul_dahiya 0:fb8047b156bb 284 {
rahul_dahiya 0:fb8047b156bb 285 MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
rahul_dahiya 0:fb8047b156bb 286 return;
rahul_dahiya 0:fb8047b156bb 287 }
rahul_dahiya 0:fb8047b156bb 288
rahul_dahiya 0:fb8047b156bb 289 elliptic_curve_len = 0;
rahul_dahiya 0:fb8047b156bb 290
rahul_dahiya 0:fb8047b156bb 291 #if defined(MBEDTLS_ECP_C)
rahul_dahiya 0:fb8047b156bb 292 for( grp_id = ssl->conf->curve_list; *grp_id != MBEDTLS_ECP_DP_NONE; grp_id++ )
rahul_dahiya 0:fb8047b156bb 293 #else
rahul_dahiya 0:fb8047b156bb 294 for( info = mbedtls_ecp_curve_list(); info->grp_id != MBEDTLS_ECP_DP_NONE; info++ )
rahul_dahiya 0:fb8047b156bb 295 #endif
rahul_dahiya 0:fb8047b156bb 296 {
rahul_dahiya 0:fb8047b156bb 297 #if defined(MBEDTLS_ECP_C)
rahul_dahiya 0:fb8047b156bb 298 info = mbedtls_ecp_curve_info_from_grp_id( *grp_id );
rahul_dahiya 0:fb8047b156bb 299 #endif
rahul_dahiya 0:fb8047b156bb 300 elliptic_curve_list[elliptic_curve_len++] = info->tls_id >> 8;
rahul_dahiya 0:fb8047b156bb 301 elliptic_curve_list[elliptic_curve_len++] = info->tls_id & 0xFF;
rahul_dahiya 0:fb8047b156bb 302 }
rahul_dahiya 0:fb8047b156bb 303
rahul_dahiya 0:fb8047b156bb 304 if( elliptic_curve_len == 0 )
rahul_dahiya 0:fb8047b156bb 305 return;
rahul_dahiya 0:fb8047b156bb 306
rahul_dahiya 0:fb8047b156bb 307 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_ELLIPTIC_CURVES >> 8 ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 308 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_ELLIPTIC_CURVES ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 309
rahul_dahiya 0:fb8047b156bb 310 *p++ = (unsigned char)( ( ( elliptic_curve_len + 2 ) >> 8 ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 311 *p++ = (unsigned char)( ( ( elliptic_curve_len + 2 ) ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 312
rahul_dahiya 0:fb8047b156bb 313 *p++ = (unsigned char)( ( ( elliptic_curve_len ) >> 8 ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 314 *p++ = (unsigned char)( ( ( elliptic_curve_len ) ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 315
rahul_dahiya 0:fb8047b156bb 316 *olen = 6 + elliptic_curve_len;
rahul_dahiya 0:fb8047b156bb 317 }
rahul_dahiya 0:fb8047b156bb 318
rahul_dahiya 0:fb8047b156bb 319 static void ssl_write_supported_point_formats_ext( mbedtls_ssl_context *ssl,
rahul_dahiya 0:fb8047b156bb 320 unsigned char *buf,
rahul_dahiya 0:fb8047b156bb 321 size_t *olen )
rahul_dahiya 0:fb8047b156bb 322 {
rahul_dahiya 0:fb8047b156bb 323 unsigned char *p = buf;
rahul_dahiya 0:fb8047b156bb 324 const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
rahul_dahiya 0:fb8047b156bb 325
rahul_dahiya 0:fb8047b156bb 326 *olen = 0;
rahul_dahiya 0:fb8047b156bb 327
rahul_dahiya 0:fb8047b156bb 328 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding supported_point_formats extension" ) );
rahul_dahiya 0:fb8047b156bb 329
rahul_dahiya 0:fb8047b156bb 330 if( end < p || (size_t)( end - p ) < 6 )
rahul_dahiya 0:fb8047b156bb 331 {
rahul_dahiya 0:fb8047b156bb 332 MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
rahul_dahiya 0:fb8047b156bb 333 return;
rahul_dahiya 0:fb8047b156bb 334 }
rahul_dahiya 0:fb8047b156bb 335
rahul_dahiya 0:fb8047b156bb 336 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS >> 8 ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 337 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 338
rahul_dahiya 0:fb8047b156bb 339 *p++ = 0x00;
rahul_dahiya 0:fb8047b156bb 340 *p++ = 2;
rahul_dahiya 0:fb8047b156bb 341
rahul_dahiya 0:fb8047b156bb 342 *p++ = 1;
rahul_dahiya 0:fb8047b156bb 343 *p++ = MBEDTLS_ECP_PF_UNCOMPRESSED;
rahul_dahiya 0:fb8047b156bb 344
rahul_dahiya 0:fb8047b156bb 345 *olen = 6;
rahul_dahiya 0:fb8047b156bb 346 }
rahul_dahiya 0:fb8047b156bb 347 #endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C ||
rahul_dahiya 0:fb8047b156bb 348 MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
rahul_dahiya 0:fb8047b156bb 349
rahul_dahiya 0:fb8047b156bb 350 #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
rahul_dahiya 0:fb8047b156bb 351 static void ssl_write_ecjpake_kkpp_ext( mbedtls_ssl_context *ssl,
rahul_dahiya 0:fb8047b156bb 352 unsigned char *buf,
rahul_dahiya 0:fb8047b156bb 353 size_t *olen )
rahul_dahiya 0:fb8047b156bb 354 {
rahul_dahiya 0:fb8047b156bb 355 int ret;
rahul_dahiya 0:fb8047b156bb 356 unsigned char *p = buf;
rahul_dahiya 0:fb8047b156bb 357 const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
rahul_dahiya 0:fb8047b156bb 358 size_t kkpp_len;
rahul_dahiya 0:fb8047b156bb 359
rahul_dahiya 0:fb8047b156bb 360 *olen = 0;
rahul_dahiya 0:fb8047b156bb 361
rahul_dahiya 0:fb8047b156bb 362 /* Skip costly extension if we can't use EC J-PAKE anyway */
rahul_dahiya 0:fb8047b156bb 363 if( mbedtls_ecjpake_check( &ssl->handshake->ecjpake_ctx ) != 0 )
rahul_dahiya 0:fb8047b156bb 364 return;
rahul_dahiya 0:fb8047b156bb 365
rahul_dahiya 0:fb8047b156bb 366 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding ecjpake_kkpp extension" ) );
rahul_dahiya 0:fb8047b156bb 367
rahul_dahiya 0:fb8047b156bb 368 if( end - p < 4 )
rahul_dahiya 0:fb8047b156bb 369 {
rahul_dahiya 0:fb8047b156bb 370 MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
rahul_dahiya 0:fb8047b156bb 371 return;
rahul_dahiya 0:fb8047b156bb 372 }
rahul_dahiya 0:fb8047b156bb 373
rahul_dahiya 0:fb8047b156bb 374 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ECJPAKE_KKPP >> 8 ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 375 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ECJPAKE_KKPP ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 376
rahul_dahiya 0:fb8047b156bb 377 /*
rahul_dahiya 0:fb8047b156bb 378 * We may need to send ClientHello multiple times for Hello verification.
rahul_dahiya 0:fb8047b156bb 379 * We don't want to compute fresh values every time (both for performance
rahul_dahiya 0:fb8047b156bb 380 * and consistency reasons), so cache the extension content.
rahul_dahiya 0:fb8047b156bb 381 */
rahul_dahiya 0:fb8047b156bb 382 if( ssl->handshake->ecjpake_cache == NULL ||
rahul_dahiya 0:fb8047b156bb 383 ssl->handshake->ecjpake_cache_len == 0 )
rahul_dahiya 0:fb8047b156bb 384 {
rahul_dahiya 0:fb8047b156bb 385 MBEDTLS_SSL_DEBUG_MSG( 3, ( "generating new ecjpake parameters" ) );
rahul_dahiya 0:fb8047b156bb 386
rahul_dahiya 0:fb8047b156bb 387 ret = mbedtls_ecjpake_write_round_one( &ssl->handshake->ecjpake_ctx,
rahul_dahiya 0:fb8047b156bb 388 p + 2, end - p - 2, &kkpp_len,
rahul_dahiya 0:fb8047b156bb 389 ssl->conf->f_rng, ssl->conf->p_rng );
rahul_dahiya 0:fb8047b156bb 390 if( ret != 0 )
rahul_dahiya 0:fb8047b156bb 391 {
rahul_dahiya 0:fb8047b156bb 392 MBEDTLS_SSL_DEBUG_RET( 1 , "mbedtls_ecjpake_write_round_one", ret );
rahul_dahiya 0:fb8047b156bb 393 return;
rahul_dahiya 0:fb8047b156bb 394 }
rahul_dahiya 0:fb8047b156bb 395
rahul_dahiya 0:fb8047b156bb 396 ssl->handshake->ecjpake_cache = mbedtls_calloc( 1, kkpp_len );
rahul_dahiya 0:fb8047b156bb 397 if( ssl->handshake->ecjpake_cache == NULL )
rahul_dahiya 0:fb8047b156bb 398 {
rahul_dahiya 0:fb8047b156bb 399 MBEDTLS_SSL_DEBUG_MSG( 1, ( "allocation failed" ) );
rahul_dahiya 0:fb8047b156bb 400 return;
rahul_dahiya 0:fb8047b156bb 401 }
rahul_dahiya 0:fb8047b156bb 402
rahul_dahiya 0:fb8047b156bb 403 memcpy( ssl->handshake->ecjpake_cache, p + 2, kkpp_len );
rahul_dahiya 0:fb8047b156bb 404 ssl->handshake->ecjpake_cache_len = kkpp_len;
rahul_dahiya 0:fb8047b156bb 405 }
rahul_dahiya 0:fb8047b156bb 406 else
rahul_dahiya 0:fb8047b156bb 407 {
rahul_dahiya 0:fb8047b156bb 408 MBEDTLS_SSL_DEBUG_MSG( 3, ( "re-using cached ecjpake parameters" ) );
rahul_dahiya 0:fb8047b156bb 409
rahul_dahiya 0:fb8047b156bb 410 kkpp_len = ssl->handshake->ecjpake_cache_len;
rahul_dahiya 0:fb8047b156bb 411
rahul_dahiya 0:fb8047b156bb 412 if( (size_t)( end - p - 2 ) < kkpp_len )
rahul_dahiya 0:fb8047b156bb 413 {
rahul_dahiya 0:fb8047b156bb 414 MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
rahul_dahiya 0:fb8047b156bb 415 return;
rahul_dahiya 0:fb8047b156bb 416 }
rahul_dahiya 0:fb8047b156bb 417
rahul_dahiya 0:fb8047b156bb 418 memcpy( p + 2, ssl->handshake->ecjpake_cache, kkpp_len );
rahul_dahiya 0:fb8047b156bb 419 }
rahul_dahiya 0:fb8047b156bb 420
rahul_dahiya 0:fb8047b156bb 421 *p++ = (unsigned char)( ( kkpp_len >> 8 ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 422 *p++ = (unsigned char)( ( kkpp_len ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 423
rahul_dahiya 0:fb8047b156bb 424 *olen = kkpp_len + 4;
rahul_dahiya 0:fb8047b156bb 425 }
rahul_dahiya 0:fb8047b156bb 426 #endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
rahul_dahiya 0:fb8047b156bb 427
rahul_dahiya 0:fb8047b156bb 428 #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
rahul_dahiya 0:fb8047b156bb 429 static void ssl_write_max_fragment_length_ext( mbedtls_ssl_context *ssl,
rahul_dahiya 0:fb8047b156bb 430 unsigned char *buf,
rahul_dahiya 0:fb8047b156bb 431 size_t *olen )
rahul_dahiya 0:fb8047b156bb 432 {
rahul_dahiya 0:fb8047b156bb 433 unsigned char *p = buf;
rahul_dahiya 0:fb8047b156bb 434 const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
rahul_dahiya 0:fb8047b156bb 435
rahul_dahiya 0:fb8047b156bb 436 *olen = 0;
rahul_dahiya 0:fb8047b156bb 437
rahul_dahiya 0:fb8047b156bb 438 if( ssl->conf->mfl_code == MBEDTLS_SSL_MAX_FRAG_LEN_NONE ) {
rahul_dahiya 0:fb8047b156bb 439 return;
rahul_dahiya 0:fb8047b156bb 440 }
rahul_dahiya 0:fb8047b156bb 441
rahul_dahiya 0:fb8047b156bb 442 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding max_fragment_length extension" ) );
rahul_dahiya 0:fb8047b156bb 443
rahul_dahiya 0:fb8047b156bb 444 if( end < p || (size_t)( end - p ) < 5 )
rahul_dahiya 0:fb8047b156bb 445 {
rahul_dahiya 0:fb8047b156bb 446 MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
rahul_dahiya 0:fb8047b156bb 447 return;
rahul_dahiya 0:fb8047b156bb 448 }
rahul_dahiya 0:fb8047b156bb 449
rahul_dahiya 0:fb8047b156bb 450 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH >> 8 ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 451 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 452
rahul_dahiya 0:fb8047b156bb 453 *p++ = 0x00;
rahul_dahiya 0:fb8047b156bb 454 *p++ = 1;
rahul_dahiya 0:fb8047b156bb 455
rahul_dahiya 0:fb8047b156bb 456 *p++ = ssl->conf->mfl_code;
rahul_dahiya 0:fb8047b156bb 457
rahul_dahiya 0:fb8047b156bb 458 *olen = 5;
rahul_dahiya 0:fb8047b156bb 459 }
rahul_dahiya 0:fb8047b156bb 460 #endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
rahul_dahiya 0:fb8047b156bb 461
rahul_dahiya 0:fb8047b156bb 462 #if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
rahul_dahiya 0:fb8047b156bb 463 static void ssl_write_truncated_hmac_ext( mbedtls_ssl_context *ssl,
rahul_dahiya 0:fb8047b156bb 464 unsigned char *buf, size_t *olen )
rahul_dahiya 0:fb8047b156bb 465 {
rahul_dahiya 0:fb8047b156bb 466 unsigned char *p = buf;
rahul_dahiya 0:fb8047b156bb 467 const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
rahul_dahiya 0:fb8047b156bb 468
rahul_dahiya 0:fb8047b156bb 469 *olen = 0;
rahul_dahiya 0:fb8047b156bb 470
rahul_dahiya 0:fb8047b156bb 471 if( ssl->conf->trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_DISABLED )
rahul_dahiya 0:fb8047b156bb 472 {
rahul_dahiya 0:fb8047b156bb 473 return;
rahul_dahiya 0:fb8047b156bb 474 }
rahul_dahiya 0:fb8047b156bb 475
rahul_dahiya 0:fb8047b156bb 476 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding truncated_hmac extension" ) );
rahul_dahiya 0:fb8047b156bb 477
rahul_dahiya 0:fb8047b156bb 478 if( end < p || (size_t)( end - p ) < 4 )
rahul_dahiya 0:fb8047b156bb 479 {
rahul_dahiya 0:fb8047b156bb 480 MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
rahul_dahiya 0:fb8047b156bb 481 return;
rahul_dahiya 0:fb8047b156bb 482 }
rahul_dahiya 0:fb8047b156bb 483
rahul_dahiya 0:fb8047b156bb 484 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_TRUNCATED_HMAC >> 8 ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 485 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_TRUNCATED_HMAC ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 486
rahul_dahiya 0:fb8047b156bb 487 *p++ = 0x00;
rahul_dahiya 0:fb8047b156bb 488 *p++ = 0x00;
rahul_dahiya 0:fb8047b156bb 489
rahul_dahiya 0:fb8047b156bb 490 *olen = 4;
rahul_dahiya 0:fb8047b156bb 491 }
rahul_dahiya 0:fb8047b156bb 492 #endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
rahul_dahiya 0:fb8047b156bb 493
rahul_dahiya 0:fb8047b156bb 494 #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
rahul_dahiya 0:fb8047b156bb 495 static void ssl_write_encrypt_then_mac_ext( mbedtls_ssl_context *ssl,
rahul_dahiya 0:fb8047b156bb 496 unsigned char *buf, size_t *olen )
rahul_dahiya 0:fb8047b156bb 497 {
rahul_dahiya 0:fb8047b156bb 498 unsigned char *p = buf;
rahul_dahiya 0:fb8047b156bb 499 const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
rahul_dahiya 0:fb8047b156bb 500
rahul_dahiya 0:fb8047b156bb 501 *olen = 0;
rahul_dahiya 0:fb8047b156bb 502
rahul_dahiya 0:fb8047b156bb 503 if( ssl->conf->encrypt_then_mac == MBEDTLS_SSL_ETM_DISABLED ||
rahul_dahiya 0:fb8047b156bb 504 ssl->conf->max_minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
rahul_dahiya 0:fb8047b156bb 505 {
rahul_dahiya 0:fb8047b156bb 506 return;
rahul_dahiya 0:fb8047b156bb 507 }
rahul_dahiya 0:fb8047b156bb 508
rahul_dahiya 0:fb8047b156bb 509 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding encrypt_then_mac "
rahul_dahiya 0:fb8047b156bb 510 "extension" ) );
rahul_dahiya 0:fb8047b156bb 511
rahul_dahiya 0:fb8047b156bb 512 if( end < p || (size_t)( end - p ) < 4 )
rahul_dahiya 0:fb8047b156bb 513 {
rahul_dahiya 0:fb8047b156bb 514 MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
rahul_dahiya 0:fb8047b156bb 515 return;
rahul_dahiya 0:fb8047b156bb 516 }
rahul_dahiya 0:fb8047b156bb 517
rahul_dahiya 0:fb8047b156bb 518 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC >> 8 ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 519 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 520
rahul_dahiya 0:fb8047b156bb 521 *p++ = 0x00;
rahul_dahiya 0:fb8047b156bb 522 *p++ = 0x00;
rahul_dahiya 0:fb8047b156bb 523
rahul_dahiya 0:fb8047b156bb 524 *olen = 4;
rahul_dahiya 0:fb8047b156bb 525 }
rahul_dahiya 0:fb8047b156bb 526 #endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
rahul_dahiya 0:fb8047b156bb 527
rahul_dahiya 0:fb8047b156bb 528 #if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
rahul_dahiya 0:fb8047b156bb 529 static void ssl_write_extended_ms_ext( mbedtls_ssl_context *ssl,
rahul_dahiya 0:fb8047b156bb 530 unsigned char *buf, size_t *olen )
rahul_dahiya 0:fb8047b156bb 531 {
rahul_dahiya 0:fb8047b156bb 532 unsigned char *p = buf;
rahul_dahiya 0:fb8047b156bb 533 const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
rahul_dahiya 0:fb8047b156bb 534
rahul_dahiya 0:fb8047b156bb 535 *olen = 0;
rahul_dahiya 0:fb8047b156bb 536
rahul_dahiya 0:fb8047b156bb 537 if( ssl->conf->extended_ms == MBEDTLS_SSL_EXTENDED_MS_DISABLED ||
rahul_dahiya 0:fb8047b156bb 538 ssl->conf->max_minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
rahul_dahiya 0:fb8047b156bb 539 {
rahul_dahiya 0:fb8047b156bb 540 return;
rahul_dahiya 0:fb8047b156bb 541 }
rahul_dahiya 0:fb8047b156bb 542
rahul_dahiya 0:fb8047b156bb 543 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding extended_master_secret "
rahul_dahiya 0:fb8047b156bb 544 "extension" ) );
rahul_dahiya 0:fb8047b156bb 545
rahul_dahiya 0:fb8047b156bb 546 if( end < p || (size_t)( end - p ) < 4 )
rahul_dahiya 0:fb8047b156bb 547 {
rahul_dahiya 0:fb8047b156bb 548 MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
rahul_dahiya 0:fb8047b156bb 549 return;
rahul_dahiya 0:fb8047b156bb 550 }
rahul_dahiya 0:fb8047b156bb 551
rahul_dahiya 0:fb8047b156bb 552 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET >> 8 ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 553 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 554
rahul_dahiya 0:fb8047b156bb 555 *p++ = 0x00;
rahul_dahiya 0:fb8047b156bb 556 *p++ = 0x00;
rahul_dahiya 0:fb8047b156bb 557
rahul_dahiya 0:fb8047b156bb 558 *olen = 4;
rahul_dahiya 0:fb8047b156bb 559 }
rahul_dahiya 0:fb8047b156bb 560 #endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */
rahul_dahiya 0:fb8047b156bb 561
rahul_dahiya 0:fb8047b156bb 562 #if defined(MBEDTLS_SSL_SESSION_TICKETS)
rahul_dahiya 0:fb8047b156bb 563 static void ssl_write_session_ticket_ext( mbedtls_ssl_context *ssl,
rahul_dahiya 0:fb8047b156bb 564 unsigned char *buf, size_t *olen )
rahul_dahiya 0:fb8047b156bb 565 {
rahul_dahiya 0:fb8047b156bb 566 unsigned char *p = buf;
rahul_dahiya 0:fb8047b156bb 567 const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
rahul_dahiya 0:fb8047b156bb 568 size_t tlen = ssl->session_negotiate->ticket_len;
rahul_dahiya 0:fb8047b156bb 569
rahul_dahiya 0:fb8047b156bb 570 *olen = 0;
rahul_dahiya 0:fb8047b156bb 571
rahul_dahiya 0:fb8047b156bb 572 if( ssl->conf->session_tickets == MBEDTLS_SSL_SESSION_TICKETS_DISABLED )
rahul_dahiya 0:fb8047b156bb 573 {
rahul_dahiya 0:fb8047b156bb 574 return;
rahul_dahiya 0:fb8047b156bb 575 }
rahul_dahiya 0:fb8047b156bb 576
rahul_dahiya 0:fb8047b156bb 577 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding session ticket extension" ) );
rahul_dahiya 0:fb8047b156bb 578
rahul_dahiya 0:fb8047b156bb 579 if( end < p || (size_t)( end - p ) < 4 + tlen )
rahul_dahiya 0:fb8047b156bb 580 {
rahul_dahiya 0:fb8047b156bb 581 MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
rahul_dahiya 0:fb8047b156bb 582 return;
rahul_dahiya 0:fb8047b156bb 583 }
rahul_dahiya 0:fb8047b156bb 584
rahul_dahiya 0:fb8047b156bb 585 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SESSION_TICKET >> 8 ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 586 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_SESSION_TICKET ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 587
rahul_dahiya 0:fb8047b156bb 588 *p++ = (unsigned char)( ( tlen >> 8 ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 589 *p++ = (unsigned char)( ( tlen ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 590
rahul_dahiya 0:fb8047b156bb 591 *olen = 4;
rahul_dahiya 0:fb8047b156bb 592
rahul_dahiya 0:fb8047b156bb 593 if( ssl->session_negotiate->ticket == NULL || tlen == 0 )
rahul_dahiya 0:fb8047b156bb 594 {
rahul_dahiya 0:fb8047b156bb 595 return;
rahul_dahiya 0:fb8047b156bb 596 }
rahul_dahiya 0:fb8047b156bb 597
rahul_dahiya 0:fb8047b156bb 598 MBEDTLS_SSL_DEBUG_MSG( 3, ( "sending session ticket of length %d", tlen ) );
rahul_dahiya 0:fb8047b156bb 599
rahul_dahiya 0:fb8047b156bb 600 memcpy( p, ssl->session_negotiate->ticket, tlen );
rahul_dahiya 0:fb8047b156bb 601
rahul_dahiya 0:fb8047b156bb 602 *olen += tlen;
rahul_dahiya 0:fb8047b156bb 603 }
rahul_dahiya 0:fb8047b156bb 604 #endif /* MBEDTLS_SSL_SESSION_TICKETS */
rahul_dahiya 0:fb8047b156bb 605
rahul_dahiya 0:fb8047b156bb 606 #if defined(MBEDTLS_SSL_ALPN)
rahul_dahiya 0:fb8047b156bb 607 static void ssl_write_alpn_ext( mbedtls_ssl_context *ssl,
rahul_dahiya 0:fb8047b156bb 608 unsigned char *buf, size_t *olen )
rahul_dahiya 0:fb8047b156bb 609 {
rahul_dahiya 0:fb8047b156bb 610 unsigned char *p = buf;
rahul_dahiya 0:fb8047b156bb 611 const unsigned char *end = ssl->out_msg + MBEDTLS_SSL_MAX_CONTENT_LEN;
rahul_dahiya 0:fb8047b156bb 612 size_t alpnlen = 0;
rahul_dahiya 0:fb8047b156bb 613 const char **cur;
rahul_dahiya 0:fb8047b156bb 614
rahul_dahiya 0:fb8047b156bb 615 *olen = 0;
rahul_dahiya 0:fb8047b156bb 616
rahul_dahiya 0:fb8047b156bb 617 if( ssl->conf->alpn_list == NULL )
rahul_dahiya 0:fb8047b156bb 618 {
rahul_dahiya 0:fb8047b156bb 619 return;
rahul_dahiya 0:fb8047b156bb 620 }
rahul_dahiya 0:fb8047b156bb 621
rahul_dahiya 0:fb8047b156bb 622 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, adding alpn extension" ) );
rahul_dahiya 0:fb8047b156bb 623
rahul_dahiya 0:fb8047b156bb 624 for( cur = ssl->conf->alpn_list; *cur != NULL; cur++ )
rahul_dahiya 0:fb8047b156bb 625 alpnlen += (unsigned char)( strlen( *cur ) & 0xFF ) + 1;
rahul_dahiya 0:fb8047b156bb 626
rahul_dahiya 0:fb8047b156bb 627 if( end < p || (size_t)( end - p ) < 6 + alpnlen )
rahul_dahiya 0:fb8047b156bb 628 {
rahul_dahiya 0:fb8047b156bb 629 MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small" ) );
rahul_dahiya 0:fb8047b156bb 630 return;
rahul_dahiya 0:fb8047b156bb 631 }
rahul_dahiya 0:fb8047b156bb 632
rahul_dahiya 0:fb8047b156bb 633 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ALPN >> 8 ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 634 *p++ = (unsigned char)( ( MBEDTLS_TLS_EXT_ALPN ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 635
rahul_dahiya 0:fb8047b156bb 636 /*
rahul_dahiya 0:fb8047b156bb 637 * opaque ProtocolName<1..2^8-1>;
rahul_dahiya 0:fb8047b156bb 638 *
rahul_dahiya 0:fb8047b156bb 639 * struct {
rahul_dahiya 0:fb8047b156bb 640 * ProtocolName protocol_name_list<2..2^16-1>
rahul_dahiya 0:fb8047b156bb 641 * } ProtocolNameList;
rahul_dahiya 0:fb8047b156bb 642 */
rahul_dahiya 0:fb8047b156bb 643
rahul_dahiya 0:fb8047b156bb 644 /* Skip writing extension and list length for now */
rahul_dahiya 0:fb8047b156bb 645 p += 4;
rahul_dahiya 0:fb8047b156bb 646
rahul_dahiya 0:fb8047b156bb 647 for( cur = ssl->conf->alpn_list; *cur != NULL; cur++ )
rahul_dahiya 0:fb8047b156bb 648 {
rahul_dahiya 0:fb8047b156bb 649 *p = (unsigned char)( strlen( *cur ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 650 memcpy( p + 1, *cur, *p );
rahul_dahiya 0:fb8047b156bb 651 p += 1 + *p;
rahul_dahiya 0:fb8047b156bb 652 }
rahul_dahiya 0:fb8047b156bb 653
rahul_dahiya 0:fb8047b156bb 654 *olen = p - buf;
rahul_dahiya 0:fb8047b156bb 655
rahul_dahiya 0:fb8047b156bb 656 /* List length = olen - 2 (ext_type) - 2 (ext_len) - 2 (list_len) */
rahul_dahiya 0:fb8047b156bb 657 buf[4] = (unsigned char)( ( ( *olen - 6 ) >> 8 ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 658 buf[5] = (unsigned char)( ( ( *olen - 6 ) ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 659
rahul_dahiya 0:fb8047b156bb 660 /* Extension length = olen - 2 (ext_type) - 2 (ext_len) */
rahul_dahiya 0:fb8047b156bb 661 buf[2] = (unsigned char)( ( ( *olen - 4 ) >> 8 ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 662 buf[3] = (unsigned char)( ( ( *olen - 4 ) ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 663 }
rahul_dahiya 0:fb8047b156bb 664 #endif /* MBEDTLS_SSL_ALPN */
rahul_dahiya 0:fb8047b156bb 665
rahul_dahiya 0:fb8047b156bb 666 /*
rahul_dahiya 0:fb8047b156bb 667 * Generate random bytes for ClientHello
rahul_dahiya 0:fb8047b156bb 668 */
rahul_dahiya 0:fb8047b156bb 669 static int ssl_generate_random( mbedtls_ssl_context *ssl )
rahul_dahiya 0:fb8047b156bb 670 {
rahul_dahiya 0:fb8047b156bb 671 int ret;
rahul_dahiya 0:fb8047b156bb 672 unsigned char *p = ssl->handshake->randbytes;
rahul_dahiya 0:fb8047b156bb 673 #if defined(MBEDTLS_HAVE_TIME)
rahul_dahiya 0:fb8047b156bb 674 mbedtls_time_t t;
rahul_dahiya 0:fb8047b156bb 675 #endif
rahul_dahiya 0:fb8047b156bb 676
rahul_dahiya 0:fb8047b156bb 677 /*
rahul_dahiya 0:fb8047b156bb 678 * When responding to a verify request, MUST reuse random (RFC 6347 4.2.1)
rahul_dahiya 0:fb8047b156bb 679 */
rahul_dahiya 0:fb8047b156bb 680 #if defined(MBEDTLS_SSL_PROTO_DTLS)
rahul_dahiya 0:fb8047b156bb 681 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
rahul_dahiya 0:fb8047b156bb 682 ssl->handshake->verify_cookie != NULL )
rahul_dahiya 0:fb8047b156bb 683 {
rahul_dahiya 0:fb8047b156bb 684 return( 0 );
rahul_dahiya 0:fb8047b156bb 685 }
rahul_dahiya 0:fb8047b156bb 686 #endif
rahul_dahiya 0:fb8047b156bb 687
rahul_dahiya 0:fb8047b156bb 688 #if defined(MBEDTLS_HAVE_TIME)
rahul_dahiya 0:fb8047b156bb 689 t = mbedtls_time( NULL );
rahul_dahiya 0:fb8047b156bb 690 *p++ = (unsigned char)( t >> 24 );
rahul_dahiya 0:fb8047b156bb 691 *p++ = (unsigned char)( t >> 16 );
rahul_dahiya 0:fb8047b156bb 692 *p++ = (unsigned char)( t >> 8 );
rahul_dahiya 0:fb8047b156bb 693 *p++ = (unsigned char)( t );
rahul_dahiya 0:fb8047b156bb 694
rahul_dahiya 0:fb8047b156bb 695 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, current time: %lu", t ) );
rahul_dahiya 0:fb8047b156bb 696 #else
rahul_dahiya 0:fb8047b156bb 697 if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, p, 4 ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 698 return( ret );
rahul_dahiya 0:fb8047b156bb 699
rahul_dahiya 0:fb8047b156bb 700 p += 4;
rahul_dahiya 0:fb8047b156bb 701 #endif /* MBEDTLS_HAVE_TIME */
rahul_dahiya 0:fb8047b156bb 702
rahul_dahiya 0:fb8047b156bb 703 if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, p, 28 ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 704 return( ret );
rahul_dahiya 0:fb8047b156bb 705
rahul_dahiya 0:fb8047b156bb 706 return( 0 );
rahul_dahiya 0:fb8047b156bb 707 }
rahul_dahiya 0:fb8047b156bb 708
rahul_dahiya 0:fb8047b156bb 709 static int ssl_write_client_hello( mbedtls_ssl_context *ssl )
rahul_dahiya 0:fb8047b156bb 710 {
rahul_dahiya 0:fb8047b156bb 711 int ret;
rahul_dahiya 0:fb8047b156bb 712 size_t i, n, olen, ext_len = 0;
rahul_dahiya 0:fb8047b156bb 713 unsigned char *buf;
rahul_dahiya 0:fb8047b156bb 714 unsigned char *p, *q;
rahul_dahiya 0:fb8047b156bb 715 unsigned char offer_compress;
rahul_dahiya 0:fb8047b156bb 716 const int *ciphersuites;
rahul_dahiya 0:fb8047b156bb 717 const mbedtls_ssl_ciphersuite_t *ciphersuite_info;
rahul_dahiya 0:fb8047b156bb 718
rahul_dahiya 0:fb8047b156bb 719 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write client hello" ) );
rahul_dahiya 0:fb8047b156bb 720
rahul_dahiya 0:fb8047b156bb 721 if( ssl->conf->f_rng == NULL )
rahul_dahiya 0:fb8047b156bb 722 {
rahul_dahiya 0:fb8047b156bb 723 MBEDTLS_SSL_DEBUG_MSG( 1, ( "no RNG provided") );
rahul_dahiya 0:fb8047b156bb 724 return( MBEDTLS_ERR_SSL_NO_RNG );
rahul_dahiya 0:fb8047b156bb 725 }
rahul_dahiya 0:fb8047b156bb 726
rahul_dahiya 0:fb8047b156bb 727 #if defined(MBEDTLS_SSL_RENEGOTIATION)
rahul_dahiya 0:fb8047b156bb 728 if( ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE )
rahul_dahiya 0:fb8047b156bb 729 #endif
rahul_dahiya 0:fb8047b156bb 730 {
rahul_dahiya 0:fb8047b156bb 731 ssl->major_ver = ssl->conf->min_major_ver;
rahul_dahiya 0:fb8047b156bb 732 ssl->minor_ver = ssl->conf->min_minor_ver;
rahul_dahiya 0:fb8047b156bb 733 }
rahul_dahiya 0:fb8047b156bb 734
rahul_dahiya 0:fb8047b156bb 735 if( ssl->conf->max_major_ver == 0 )
rahul_dahiya 0:fb8047b156bb 736 {
rahul_dahiya 0:fb8047b156bb 737 MBEDTLS_SSL_DEBUG_MSG( 1, ( "configured max major version is invalid, "
rahul_dahiya 0:fb8047b156bb 738 "consider using mbedtls_ssl_config_defaults()" ) );
rahul_dahiya 0:fb8047b156bb 739 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
rahul_dahiya 0:fb8047b156bb 740 }
rahul_dahiya 0:fb8047b156bb 741
rahul_dahiya 0:fb8047b156bb 742 /*
rahul_dahiya 0:fb8047b156bb 743 * 0 . 0 handshake type
rahul_dahiya 0:fb8047b156bb 744 * 1 . 3 handshake length
rahul_dahiya 0:fb8047b156bb 745 * 4 . 5 highest version supported
rahul_dahiya 0:fb8047b156bb 746 * 6 . 9 current UNIX time
rahul_dahiya 0:fb8047b156bb 747 * 10 . 37 random bytes
rahul_dahiya 0:fb8047b156bb 748 */
rahul_dahiya 0:fb8047b156bb 749 buf = ssl->out_msg;
rahul_dahiya 0:fb8047b156bb 750 p = buf + 4;
rahul_dahiya 0:fb8047b156bb 751
rahul_dahiya 0:fb8047b156bb 752 mbedtls_ssl_write_version( ssl->conf->max_major_ver, ssl->conf->max_minor_ver,
rahul_dahiya 0:fb8047b156bb 753 ssl->conf->transport, p );
rahul_dahiya 0:fb8047b156bb 754 p += 2;
rahul_dahiya 0:fb8047b156bb 755
rahul_dahiya 0:fb8047b156bb 756 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, max version: [%d:%d]",
rahul_dahiya 0:fb8047b156bb 757 buf[4], buf[5] ) );
rahul_dahiya 0:fb8047b156bb 758
rahul_dahiya 0:fb8047b156bb 759 if( ( ret = ssl_generate_random( ssl ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 760 {
rahul_dahiya 0:fb8047b156bb 761 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_generate_random", ret );
rahul_dahiya 0:fb8047b156bb 762 return( ret );
rahul_dahiya 0:fb8047b156bb 763 }
rahul_dahiya 0:fb8047b156bb 764
rahul_dahiya 0:fb8047b156bb 765 memcpy( p, ssl->handshake->randbytes, 32 );
rahul_dahiya 0:fb8047b156bb 766 MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, random bytes", p, 32 );
rahul_dahiya 0:fb8047b156bb 767 p += 32;
rahul_dahiya 0:fb8047b156bb 768
rahul_dahiya 0:fb8047b156bb 769 /*
rahul_dahiya 0:fb8047b156bb 770 * 38 . 38 session id length
rahul_dahiya 0:fb8047b156bb 771 * 39 . 39+n session id
rahul_dahiya 0:fb8047b156bb 772 * 39+n . 39+n DTLS only: cookie length (1 byte)
rahul_dahiya 0:fb8047b156bb 773 * 40+n . .. DTSL only: cookie
rahul_dahiya 0:fb8047b156bb 774 * .. . .. ciphersuitelist length (2 bytes)
rahul_dahiya 0:fb8047b156bb 775 * .. . .. ciphersuitelist
rahul_dahiya 0:fb8047b156bb 776 * .. . .. compression methods length (1 byte)
rahul_dahiya 0:fb8047b156bb 777 * .. . .. compression methods
rahul_dahiya 0:fb8047b156bb 778 * .. . .. extensions length (2 bytes)
rahul_dahiya 0:fb8047b156bb 779 * .. . .. extensions
rahul_dahiya 0:fb8047b156bb 780 */
rahul_dahiya 0:fb8047b156bb 781 n = ssl->session_negotiate->id_len;
rahul_dahiya 0:fb8047b156bb 782
rahul_dahiya 0:fb8047b156bb 783 if( n < 16 || n > 32 ||
rahul_dahiya 0:fb8047b156bb 784 #if defined(MBEDTLS_SSL_RENEGOTIATION)
rahul_dahiya 0:fb8047b156bb 785 ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE ||
rahul_dahiya 0:fb8047b156bb 786 #endif
rahul_dahiya 0:fb8047b156bb 787 ssl->handshake->resume == 0 )
rahul_dahiya 0:fb8047b156bb 788 {
rahul_dahiya 0:fb8047b156bb 789 n = 0;
rahul_dahiya 0:fb8047b156bb 790 }
rahul_dahiya 0:fb8047b156bb 791
rahul_dahiya 0:fb8047b156bb 792 #if defined(MBEDTLS_SSL_SESSION_TICKETS)
rahul_dahiya 0:fb8047b156bb 793 /*
rahul_dahiya 0:fb8047b156bb 794 * RFC 5077 section 3.4: "When presenting a ticket, the client MAY
rahul_dahiya 0:fb8047b156bb 795 * generate and include a Session ID in the TLS ClientHello."
rahul_dahiya 0:fb8047b156bb 796 */
rahul_dahiya 0:fb8047b156bb 797 #if defined(MBEDTLS_SSL_RENEGOTIATION)
rahul_dahiya 0:fb8047b156bb 798 if( ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE )
rahul_dahiya 0:fb8047b156bb 799 #endif
rahul_dahiya 0:fb8047b156bb 800 {
rahul_dahiya 0:fb8047b156bb 801 if( ssl->session_negotiate->ticket != NULL &&
rahul_dahiya 0:fb8047b156bb 802 ssl->session_negotiate->ticket_len != 0 )
rahul_dahiya 0:fb8047b156bb 803 {
rahul_dahiya 0:fb8047b156bb 804 ret = ssl->conf->f_rng( ssl->conf->p_rng, ssl->session_negotiate->id, 32 );
rahul_dahiya 0:fb8047b156bb 805
rahul_dahiya 0:fb8047b156bb 806 if( ret != 0 )
rahul_dahiya 0:fb8047b156bb 807 return( ret );
rahul_dahiya 0:fb8047b156bb 808
rahul_dahiya 0:fb8047b156bb 809 ssl->session_negotiate->id_len = n = 32;
rahul_dahiya 0:fb8047b156bb 810 }
rahul_dahiya 0:fb8047b156bb 811 }
rahul_dahiya 0:fb8047b156bb 812 #endif /* MBEDTLS_SSL_SESSION_TICKETS */
rahul_dahiya 0:fb8047b156bb 813
rahul_dahiya 0:fb8047b156bb 814 *p++ = (unsigned char) n;
rahul_dahiya 0:fb8047b156bb 815
rahul_dahiya 0:fb8047b156bb 816 for( i = 0; i < n; i++ )
rahul_dahiya 0:fb8047b156bb 817 *p++ = ssl->session_negotiate->id[i];
rahul_dahiya 0:fb8047b156bb 818
rahul_dahiya 0:fb8047b156bb 819 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, session id len.: %d", n ) );
rahul_dahiya 0:fb8047b156bb 820 MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, session id", buf + 39, n );
rahul_dahiya 0:fb8047b156bb 821
rahul_dahiya 0:fb8047b156bb 822 /*
rahul_dahiya 0:fb8047b156bb 823 * DTLS cookie
rahul_dahiya 0:fb8047b156bb 824 */
rahul_dahiya 0:fb8047b156bb 825 #if defined(MBEDTLS_SSL_PROTO_DTLS)
rahul_dahiya 0:fb8047b156bb 826 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
rahul_dahiya 0:fb8047b156bb 827 {
rahul_dahiya 0:fb8047b156bb 828 if( ssl->handshake->verify_cookie == NULL )
rahul_dahiya 0:fb8047b156bb 829 {
rahul_dahiya 0:fb8047b156bb 830 MBEDTLS_SSL_DEBUG_MSG( 3, ( "no verify cookie to send" ) );
rahul_dahiya 0:fb8047b156bb 831 *p++ = 0;
rahul_dahiya 0:fb8047b156bb 832 }
rahul_dahiya 0:fb8047b156bb 833 else
rahul_dahiya 0:fb8047b156bb 834 {
rahul_dahiya 0:fb8047b156bb 835 MBEDTLS_SSL_DEBUG_BUF( 3, "client hello, cookie",
rahul_dahiya 0:fb8047b156bb 836 ssl->handshake->verify_cookie,
rahul_dahiya 0:fb8047b156bb 837 ssl->handshake->verify_cookie_len );
rahul_dahiya 0:fb8047b156bb 838
rahul_dahiya 0:fb8047b156bb 839 *p++ = ssl->handshake->verify_cookie_len;
rahul_dahiya 0:fb8047b156bb 840 memcpy( p, ssl->handshake->verify_cookie,
rahul_dahiya 0:fb8047b156bb 841 ssl->handshake->verify_cookie_len );
rahul_dahiya 0:fb8047b156bb 842 p += ssl->handshake->verify_cookie_len;
rahul_dahiya 0:fb8047b156bb 843 }
rahul_dahiya 0:fb8047b156bb 844 }
rahul_dahiya 0:fb8047b156bb 845 #endif
rahul_dahiya 0:fb8047b156bb 846
rahul_dahiya 0:fb8047b156bb 847 /*
rahul_dahiya 0:fb8047b156bb 848 * Ciphersuite list
rahul_dahiya 0:fb8047b156bb 849 */
rahul_dahiya 0:fb8047b156bb 850 ciphersuites = ssl->conf->ciphersuite_list[ssl->minor_ver];
rahul_dahiya 0:fb8047b156bb 851
rahul_dahiya 0:fb8047b156bb 852 /* Skip writing ciphersuite length for now */
rahul_dahiya 0:fb8047b156bb 853 n = 0;
rahul_dahiya 0:fb8047b156bb 854 q = p;
rahul_dahiya 0:fb8047b156bb 855 p += 2;
rahul_dahiya 0:fb8047b156bb 856
rahul_dahiya 0:fb8047b156bb 857 for( i = 0; ciphersuites[i] != 0; i++ )
rahul_dahiya 0:fb8047b156bb 858 {
rahul_dahiya 0:fb8047b156bb 859 ciphersuite_info = mbedtls_ssl_ciphersuite_from_id( ciphersuites[i] );
rahul_dahiya 0:fb8047b156bb 860
rahul_dahiya 0:fb8047b156bb 861 if( ciphersuite_info == NULL )
rahul_dahiya 0:fb8047b156bb 862 continue;
rahul_dahiya 0:fb8047b156bb 863
rahul_dahiya 0:fb8047b156bb 864 if( ciphersuite_info->min_minor_ver > ssl->conf->max_minor_ver ||
rahul_dahiya 0:fb8047b156bb 865 ciphersuite_info->max_minor_ver < ssl->conf->min_minor_ver )
rahul_dahiya 0:fb8047b156bb 866 continue;
rahul_dahiya 0:fb8047b156bb 867
rahul_dahiya 0:fb8047b156bb 868 #if defined(MBEDTLS_SSL_PROTO_DTLS)
rahul_dahiya 0:fb8047b156bb 869 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
rahul_dahiya 0:fb8047b156bb 870 ( ciphersuite_info->flags & MBEDTLS_CIPHERSUITE_NODTLS ) )
rahul_dahiya 0:fb8047b156bb 871 continue;
rahul_dahiya 0:fb8047b156bb 872 #endif
rahul_dahiya 0:fb8047b156bb 873
rahul_dahiya 0:fb8047b156bb 874 #if defined(MBEDTLS_ARC4_C)
rahul_dahiya 0:fb8047b156bb 875 if( ssl->conf->arc4_disabled == MBEDTLS_SSL_ARC4_DISABLED &&
rahul_dahiya 0:fb8047b156bb 876 ciphersuite_info->cipher == MBEDTLS_CIPHER_ARC4_128 )
rahul_dahiya 0:fb8047b156bb 877 continue;
rahul_dahiya 0:fb8047b156bb 878 #endif
rahul_dahiya 0:fb8047b156bb 879
rahul_dahiya 0:fb8047b156bb 880 #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
rahul_dahiya 0:fb8047b156bb 881 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE &&
rahul_dahiya 0:fb8047b156bb 882 mbedtls_ecjpake_check( &ssl->handshake->ecjpake_ctx ) != 0 )
rahul_dahiya 0:fb8047b156bb 883 continue;
rahul_dahiya 0:fb8047b156bb 884 #endif
rahul_dahiya 0:fb8047b156bb 885
rahul_dahiya 0:fb8047b156bb 886 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, add ciphersuite: %04x",
rahul_dahiya 0:fb8047b156bb 887 ciphersuites[i] ) );
rahul_dahiya 0:fb8047b156bb 888
rahul_dahiya 0:fb8047b156bb 889 n++;
rahul_dahiya 0:fb8047b156bb 890 *p++ = (unsigned char)( ciphersuites[i] >> 8 );
rahul_dahiya 0:fb8047b156bb 891 *p++ = (unsigned char)( ciphersuites[i] );
rahul_dahiya 0:fb8047b156bb 892 }
rahul_dahiya 0:fb8047b156bb 893
rahul_dahiya 0:fb8047b156bb 894 /*
rahul_dahiya 0:fb8047b156bb 895 * Add TLS_EMPTY_RENEGOTIATION_INFO_SCSV
rahul_dahiya 0:fb8047b156bb 896 */
rahul_dahiya 0:fb8047b156bb 897 #if defined(MBEDTLS_SSL_RENEGOTIATION)
rahul_dahiya 0:fb8047b156bb 898 if( ssl->renego_status == MBEDTLS_SSL_INITIAL_HANDSHAKE )
rahul_dahiya 0:fb8047b156bb 899 #endif
rahul_dahiya 0:fb8047b156bb 900 {
rahul_dahiya 0:fb8047b156bb 901 *p++ = (unsigned char)( MBEDTLS_SSL_EMPTY_RENEGOTIATION_INFO >> 8 );
rahul_dahiya 0:fb8047b156bb 902 *p++ = (unsigned char)( MBEDTLS_SSL_EMPTY_RENEGOTIATION_INFO );
rahul_dahiya 0:fb8047b156bb 903 n++;
rahul_dahiya 0:fb8047b156bb 904 }
rahul_dahiya 0:fb8047b156bb 905
rahul_dahiya 0:fb8047b156bb 906 /* Some versions of OpenSSL don't handle it correctly if not at end */
rahul_dahiya 0:fb8047b156bb 907 #if defined(MBEDTLS_SSL_FALLBACK_SCSV)
rahul_dahiya 0:fb8047b156bb 908 if( ssl->conf->fallback == MBEDTLS_SSL_IS_FALLBACK )
rahul_dahiya 0:fb8047b156bb 909 {
rahul_dahiya 0:fb8047b156bb 910 MBEDTLS_SSL_DEBUG_MSG( 3, ( "adding FALLBACK_SCSV" ) );
rahul_dahiya 0:fb8047b156bb 911 *p++ = (unsigned char)( MBEDTLS_SSL_FALLBACK_SCSV_VALUE >> 8 );
rahul_dahiya 0:fb8047b156bb 912 *p++ = (unsigned char)( MBEDTLS_SSL_FALLBACK_SCSV_VALUE );
rahul_dahiya 0:fb8047b156bb 913 n++;
rahul_dahiya 0:fb8047b156bb 914 }
rahul_dahiya 0:fb8047b156bb 915 #endif
rahul_dahiya 0:fb8047b156bb 916
rahul_dahiya 0:fb8047b156bb 917 *q++ = (unsigned char)( n >> 7 );
rahul_dahiya 0:fb8047b156bb 918 *q++ = (unsigned char)( n << 1 );
rahul_dahiya 0:fb8047b156bb 919
rahul_dahiya 0:fb8047b156bb 920 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, got %d ciphersuites", n ) );
rahul_dahiya 0:fb8047b156bb 921
rahul_dahiya 0:fb8047b156bb 922 #if defined(MBEDTLS_ZLIB_SUPPORT)
rahul_dahiya 0:fb8047b156bb 923 offer_compress = 1;
rahul_dahiya 0:fb8047b156bb 924 #else
rahul_dahiya 0:fb8047b156bb 925 offer_compress = 0;
rahul_dahiya 0:fb8047b156bb 926 #endif
rahul_dahiya 0:fb8047b156bb 927
rahul_dahiya 0:fb8047b156bb 928 /*
rahul_dahiya 0:fb8047b156bb 929 * We don't support compression with DTLS right now: is many records come
rahul_dahiya 0:fb8047b156bb 930 * in the same datagram, uncompressing one could overwrite the next one.
rahul_dahiya 0:fb8047b156bb 931 * We don't want to add complexity for handling that case unless there is
rahul_dahiya 0:fb8047b156bb 932 * an actual need for it.
rahul_dahiya 0:fb8047b156bb 933 */
rahul_dahiya 0:fb8047b156bb 934 #if defined(MBEDTLS_SSL_PROTO_DTLS)
rahul_dahiya 0:fb8047b156bb 935 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
rahul_dahiya 0:fb8047b156bb 936 offer_compress = 0;
rahul_dahiya 0:fb8047b156bb 937 #endif
rahul_dahiya 0:fb8047b156bb 938
rahul_dahiya 0:fb8047b156bb 939 if( offer_compress )
rahul_dahiya 0:fb8047b156bb 940 {
rahul_dahiya 0:fb8047b156bb 941 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, compress len.: %d", 2 ) );
rahul_dahiya 0:fb8047b156bb 942 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, compress alg.: %d %d",
rahul_dahiya 0:fb8047b156bb 943 MBEDTLS_SSL_COMPRESS_DEFLATE, MBEDTLS_SSL_COMPRESS_NULL ) );
rahul_dahiya 0:fb8047b156bb 944
rahul_dahiya 0:fb8047b156bb 945 *p++ = 2;
rahul_dahiya 0:fb8047b156bb 946 *p++ = MBEDTLS_SSL_COMPRESS_DEFLATE;
rahul_dahiya 0:fb8047b156bb 947 *p++ = MBEDTLS_SSL_COMPRESS_NULL;
rahul_dahiya 0:fb8047b156bb 948 }
rahul_dahiya 0:fb8047b156bb 949 else
rahul_dahiya 0:fb8047b156bb 950 {
rahul_dahiya 0:fb8047b156bb 951 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, compress len.: %d", 1 ) );
rahul_dahiya 0:fb8047b156bb 952 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, compress alg.: %d",
rahul_dahiya 0:fb8047b156bb 953 MBEDTLS_SSL_COMPRESS_NULL ) );
rahul_dahiya 0:fb8047b156bb 954
rahul_dahiya 0:fb8047b156bb 955 *p++ = 1;
rahul_dahiya 0:fb8047b156bb 956 *p++ = MBEDTLS_SSL_COMPRESS_NULL;
rahul_dahiya 0:fb8047b156bb 957 }
rahul_dahiya 0:fb8047b156bb 958
rahul_dahiya 0:fb8047b156bb 959 // First write extensions, then the total length
rahul_dahiya 0:fb8047b156bb 960 //
rahul_dahiya 0:fb8047b156bb 961 #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
rahul_dahiya 0:fb8047b156bb 962 ssl_write_hostname_ext( ssl, p + 2 + ext_len, &olen );
rahul_dahiya 0:fb8047b156bb 963 ext_len += olen;
rahul_dahiya 0:fb8047b156bb 964 #endif
rahul_dahiya 0:fb8047b156bb 965
rahul_dahiya 0:fb8047b156bb 966 #if defined(MBEDTLS_SSL_RENEGOTIATION)
rahul_dahiya 0:fb8047b156bb 967 ssl_write_renegotiation_ext( ssl, p + 2 + ext_len, &olen );
rahul_dahiya 0:fb8047b156bb 968 ext_len += olen;
rahul_dahiya 0:fb8047b156bb 969 #endif
rahul_dahiya 0:fb8047b156bb 970
rahul_dahiya 0:fb8047b156bb 971 #if defined(MBEDTLS_SSL_PROTO_TLS1_2) && \
rahul_dahiya 0:fb8047b156bb 972 defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
rahul_dahiya 0:fb8047b156bb 973 ssl_write_signature_algorithms_ext( ssl, p + 2 + ext_len, &olen );
rahul_dahiya 0:fb8047b156bb 974 ext_len += olen;
rahul_dahiya 0:fb8047b156bb 975 #endif
rahul_dahiya 0:fb8047b156bb 976
rahul_dahiya 0:fb8047b156bb 977 #if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \
rahul_dahiya 0:fb8047b156bb 978 defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
rahul_dahiya 0:fb8047b156bb 979 ssl_write_supported_elliptic_curves_ext( ssl, p + 2 + ext_len, &olen );
rahul_dahiya 0:fb8047b156bb 980 ext_len += olen;
rahul_dahiya 0:fb8047b156bb 981
rahul_dahiya 0:fb8047b156bb 982 ssl_write_supported_point_formats_ext( ssl, p + 2 + ext_len, &olen );
rahul_dahiya 0:fb8047b156bb 983 ext_len += olen;
rahul_dahiya 0:fb8047b156bb 984 #endif
rahul_dahiya 0:fb8047b156bb 985
rahul_dahiya 0:fb8047b156bb 986 #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
rahul_dahiya 0:fb8047b156bb 987 ssl_write_ecjpake_kkpp_ext( ssl, p + 2 + ext_len, &olen );
rahul_dahiya 0:fb8047b156bb 988 ext_len += olen;
rahul_dahiya 0:fb8047b156bb 989 #endif
rahul_dahiya 0:fb8047b156bb 990
rahul_dahiya 0:fb8047b156bb 991 #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
rahul_dahiya 0:fb8047b156bb 992 ssl_write_max_fragment_length_ext( ssl, p + 2 + ext_len, &olen );
rahul_dahiya 0:fb8047b156bb 993 ext_len += olen;
rahul_dahiya 0:fb8047b156bb 994 #endif
rahul_dahiya 0:fb8047b156bb 995
rahul_dahiya 0:fb8047b156bb 996 #if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
rahul_dahiya 0:fb8047b156bb 997 ssl_write_truncated_hmac_ext( ssl, p + 2 + ext_len, &olen );
rahul_dahiya 0:fb8047b156bb 998 ext_len += olen;
rahul_dahiya 0:fb8047b156bb 999 #endif
rahul_dahiya 0:fb8047b156bb 1000
rahul_dahiya 0:fb8047b156bb 1001 #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
rahul_dahiya 0:fb8047b156bb 1002 ssl_write_encrypt_then_mac_ext( ssl, p + 2 + ext_len, &olen );
rahul_dahiya 0:fb8047b156bb 1003 ext_len += olen;
rahul_dahiya 0:fb8047b156bb 1004 #endif
rahul_dahiya 0:fb8047b156bb 1005
rahul_dahiya 0:fb8047b156bb 1006 #if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
rahul_dahiya 0:fb8047b156bb 1007 ssl_write_extended_ms_ext( ssl, p + 2 + ext_len, &olen );
rahul_dahiya 0:fb8047b156bb 1008 ext_len += olen;
rahul_dahiya 0:fb8047b156bb 1009 #endif
rahul_dahiya 0:fb8047b156bb 1010
rahul_dahiya 0:fb8047b156bb 1011 #if defined(MBEDTLS_SSL_ALPN)
rahul_dahiya 0:fb8047b156bb 1012 ssl_write_alpn_ext( ssl, p + 2 + ext_len, &olen );
rahul_dahiya 0:fb8047b156bb 1013 ext_len += olen;
rahul_dahiya 0:fb8047b156bb 1014 #endif
rahul_dahiya 0:fb8047b156bb 1015
rahul_dahiya 0:fb8047b156bb 1016 #if defined(MBEDTLS_SSL_SESSION_TICKETS)
rahul_dahiya 0:fb8047b156bb 1017 ssl_write_session_ticket_ext( ssl, p + 2 + ext_len, &olen );
rahul_dahiya 0:fb8047b156bb 1018 ext_len += olen;
rahul_dahiya 0:fb8047b156bb 1019 #endif
rahul_dahiya 0:fb8047b156bb 1020
rahul_dahiya 0:fb8047b156bb 1021 /* olen unused if all extensions are disabled */
rahul_dahiya 0:fb8047b156bb 1022 ((void) olen);
rahul_dahiya 0:fb8047b156bb 1023
rahul_dahiya 0:fb8047b156bb 1024 MBEDTLS_SSL_DEBUG_MSG( 3, ( "client hello, total extension length: %d",
rahul_dahiya 0:fb8047b156bb 1025 ext_len ) );
rahul_dahiya 0:fb8047b156bb 1026
rahul_dahiya 0:fb8047b156bb 1027 if( ext_len > 0 )
rahul_dahiya 0:fb8047b156bb 1028 {
rahul_dahiya 0:fb8047b156bb 1029 *p++ = (unsigned char)( ( ext_len >> 8 ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 1030 *p++ = (unsigned char)( ( ext_len ) & 0xFF );
rahul_dahiya 0:fb8047b156bb 1031 p += ext_len;
rahul_dahiya 0:fb8047b156bb 1032 }
rahul_dahiya 0:fb8047b156bb 1033
rahul_dahiya 0:fb8047b156bb 1034 ssl->out_msglen = p - buf;
rahul_dahiya 0:fb8047b156bb 1035 ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
rahul_dahiya 0:fb8047b156bb 1036 ssl->out_msg[0] = MBEDTLS_SSL_HS_CLIENT_HELLO;
rahul_dahiya 0:fb8047b156bb 1037
rahul_dahiya 0:fb8047b156bb 1038 ssl->state++;
rahul_dahiya 0:fb8047b156bb 1039
rahul_dahiya 0:fb8047b156bb 1040 #if defined(MBEDTLS_SSL_PROTO_DTLS)
rahul_dahiya 0:fb8047b156bb 1041 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
rahul_dahiya 0:fb8047b156bb 1042 mbedtls_ssl_send_flight_completed( ssl );
rahul_dahiya 0:fb8047b156bb 1043 #endif
rahul_dahiya 0:fb8047b156bb 1044
rahul_dahiya 0:fb8047b156bb 1045 if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 1046 {
rahul_dahiya 0:fb8047b156bb 1047 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
rahul_dahiya 0:fb8047b156bb 1048 return( ret );
rahul_dahiya 0:fb8047b156bb 1049 }
rahul_dahiya 0:fb8047b156bb 1050
rahul_dahiya 0:fb8047b156bb 1051 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write client hello" ) );
rahul_dahiya 0:fb8047b156bb 1052
rahul_dahiya 0:fb8047b156bb 1053 return( 0 );
rahul_dahiya 0:fb8047b156bb 1054 }
rahul_dahiya 0:fb8047b156bb 1055
rahul_dahiya 0:fb8047b156bb 1056 static int ssl_parse_renegotiation_info( mbedtls_ssl_context *ssl,
rahul_dahiya 0:fb8047b156bb 1057 const unsigned char *buf,
rahul_dahiya 0:fb8047b156bb 1058 size_t len )
rahul_dahiya 0:fb8047b156bb 1059 {
rahul_dahiya 0:fb8047b156bb 1060 #if defined(MBEDTLS_SSL_RENEGOTIATION)
rahul_dahiya 0:fb8047b156bb 1061 if( ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE )
rahul_dahiya 0:fb8047b156bb 1062 {
rahul_dahiya 0:fb8047b156bb 1063 /* Check verify-data in constant-time. The length OTOH is no secret */
rahul_dahiya 0:fb8047b156bb 1064 if( len != 1 + ssl->verify_data_len * 2 ||
rahul_dahiya 0:fb8047b156bb 1065 buf[0] != ssl->verify_data_len * 2 ||
rahul_dahiya 0:fb8047b156bb 1066 mbedtls_ssl_safer_memcmp( buf + 1,
rahul_dahiya 0:fb8047b156bb 1067 ssl->own_verify_data, ssl->verify_data_len ) != 0 ||
rahul_dahiya 0:fb8047b156bb 1068 mbedtls_ssl_safer_memcmp( buf + 1 + ssl->verify_data_len,
rahul_dahiya 0:fb8047b156bb 1069 ssl->peer_verify_data, ssl->verify_data_len ) != 0 )
rahul_dahiya 0:fb8047b156bb 1070 {
rahul_dahiya 0:fb8047b156bb 1071 MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-matching renegotiation info" ) );
rahul_dahiya 0:fb8047b156bb 1072 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 1073 MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
rahul_dahiya 0:fb8047b156bb 1074 return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
rahul_dahiya 0:fb8047b156bb 1075 }
rahul_dahiya 0:fb8047b156bb 1076 }
rahul_dahiya 0:fb8047b156bb 1077 else
rahul_dahiya 0:fb8047b156bb 1078 #endif /* MBEDTLS_SSL_RENEGOTIATION */
rahul_dahiya 0:fb8047b156bb 1079 {
rahul_dahiya 0:fb8047b156bb 1080 if( len != 1 || buf[0] != 0x00 )
rahul_dahiya 0:fb8047b156bb 1081 {
rahul_dahiya 0:fb8047b156bb 1082 MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-zero length renegotiation info" ) );
rahul_dahiya 0:fb8047b156bb 1083 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 1084 MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
rahul_dahiya 0:fb8047b156bb 1085 return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
rahul_dahiya 0:fb8047b156bb 1086 }
rahul_dahiya 0:fb8047b156bb 1087
rahul_dahiya 0:fb8047b156bb 1088 ssl->secure_renegotiation = MBEDTLS_SSL_SECURE_RENEGOTIATION;
rahul_dahiya 0:fb8047b156bb 1089 }
rahul_dahiya 0:fb8047b156bb 1090
rahul_dahiya 0:fb8047b156bb 1091 return( 0 );
rahul_dahiya 0:fb8047b156bb 1092 }
rahul_dahiya 0:fb8047b156bb 1093
rahul_dahiya 0:fb8047b156bb 1094 #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
rahul_dahiya 0:fb8047b156bb 1095 static int ssl_parse_max_fragment_length_ext( mbedtls_ssl_context *ssl,
rahul_dahiya 0:fb8047b156bb 1096 const unsigned char *buf,
rahul_dahiya 0:fb8047b156bb 1097 size_t len )
rahul_dahiya 0:fb8047b156bb 1098 {
rahul_dahiya 0:fb8047b156bb 1099 /*
rahul_dahiya 0:fb8047b156bb 1100 * server should use the extension only if we did,
rahul_dahiya 0:fb8047b156bb 1101 * and if so the server's value should match ours (and len is always 1)
rahul_dahiya 0:fb8047b156bb 1102 */
rahul_dahiya 0:fb8047b156bb 1103 if( ssl->conf->mfl_code == MBEDTLS_SSL_MAX_FRAG_LEN_NONE ||
rahul_dahiya 0:fb8047b156bb 1104 len != 1 ||
rahul_dahiya 0:fb8047b156bb 1105 buf[0] != ssl->conf->mfl_code )
rahul_dahiya 0:fb8047b156bb 1106 {
rahul_dahiya 0:fb8047b156bb 1107 MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-matching max fragment length extension" ) );
rahul_dahiya 0:fb8047b156bb 1108 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 1109 MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
rahul_dahiya 0:fb8047b156bb 1110 return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
rahul_dahiya 0:fb8047b156bb 1111 }
rahul_dahiya 0:fb8047b156bb 1112
rahul_dahiya 0:fb8047b156bb 1113 return( 0 );
rahul_dahiya 0:fb8047b156bb 1114 }
rahul_dahiya 0:fb8047b156bb 1115 #endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
rahul_dahiya 0:fb8047b156bb 1116
rahul_dahiya 0:fb8047b156bb 1117 #if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
rahul_dahiya 0:fb8047b156bb 1118 static int ssl_parse_truncated_hmac_ext( mbedtls_ssl_context *ssl,
rahul_dahiya 0:fb8047b156bb 1119 const unsigned char *buf,
rahul_dahiya 0:fb8047b156bb 1120 size_t len )
rahul_dahiya 0:fb8047b156bb 1121 {
rahul_dahiya 0:fb8047b156bb 1122 if( ssl->conf->trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_DISABLED ||
rahul_dahiya 0:fb8047b156bb 1123 len != 0 )
rahul_dahiya 0:fb8047b156bb 1124 {
rahul_dahiya 0:fb8047b156bb 1125 MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-matching truncated HMAC extension" ) );
rahul_dahiya 0:fb8047b156bb 1126 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 1127 MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
rahul_dahiya 0:fb8047b156bb 1128 return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
rahul_dahiya 0:fb8047b156bb 1129 }
rahul_dahiya 0:fb8047b156bb 1130
rahul_dahiya 0:fb8047b156bb 1131 ((void) buf);
rahul_dahiya 0:fb8047b156bb 1132
rahul_dahiya 0:fb8047b156bb 1133 ssl->session_negotiate->trunc_hmac = MBEDTLS_SSL_TRUNC_HMAC_ENABLED;
rahul_dahiya 0:fb8047b156bb 1134
rahul_dahiya 0:fb8047b156bb 1135 return( 0 );
rahul_dahiya 0:fb8047b156bb 1136 }
rahul_dahiya 0:fb8047b156bb 1137 #endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
rahul_dahiya 0:fb8047b156bb 1138
rahul_dahiya 0:fb8047b156bb 1139 #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
rahul_dahiya 0:fb8047b156bb 1140 static int ssl_parse_encrypt_then_mac_ext( mbedtls_ssl_context *ssl,
rahul_dahiya 0:fb8047b156bb 1141 const unsigned char *buf,
rahul_dahiya 0:fb8047b156bb 1142 size_t len )
rahul_dahiya 0:fb8047b156bb 1143 {
rahul_dahiya 0:fb8047b156bb 1144 if( ssl->conf->encrypt_then_mac == MBEDTLS_SSL_ETM_DISABLED ||
rahul_dahiya 0:fb8047b156bb 1145 ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ||
rahul_dahiya 0:fb8047b156bb 1146 len != 0 )
rahul_dahiya 0:fb8047b156bb 1147 {
rahul_dahiya 0:fb8047b156bb 1148 MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-matching encrypt-then-MAC extension" ) );
rahul_dahiya 0:fb8047b156bb 1149 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 1150 MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
rahul_dahiya 0:fb8047b156bb 1151 return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
rahul_dahiya 0:fb8047b156bb 1152 }
rahul_dahiya 0:fb8047b156bb 1153
rahul_dahiya 0:fb8047b156bb 1154 ((void) buf);
rahul_dahiya 0:fb8047b156bb 1155
rahul_dahiya 0:fb8047b156bb 1156 ssl->session_negotiate->encrypt_then_mac = MBEDTLS_SSL_ETM_ENABLED;
rahul_dahiya 0:fb8047b156bb 1157
rahul_dahiya 0:fb8047b156bb 1158 return( 0 );
rahul_dahiya 0:fb8047b156bb 1159 }
rahul_dahiya 0:fb8047b156bb 1160 #endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
rahul_dahiya 0:fb8047b156bb 1161
rahul_dahiya 0:fb8047b156bb 1162 #if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
rahul_dahiya 0:fb8047b156bb 1163 static int ssl_parse_extended_ms_ext( mbedtls_ssl_context *ssl,
rahul_dahiya 0:fb8047b156bb 1164 const unsigned char *buf,
rahul_dahiya 0:fb8047b156bb 1165 size_t len )
rahul_dahiya 0:fb8047b156bb 1166 {
rahul_dahiya 0:fb8047b156bb 1167 if( ssl->conf->extended_ms == MBEDTLS_SSL_EXTENDED_MS_DISABLED ||
rahul_dahiya 0:fb8047b156bb 1168 ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ||
rahul_dahiya 0:fb8047b156bb 1169 len != 0 )
rahul_dahiya 0:fb8047b156bb 1170 {
rahul_dahiya 0:fb8047b156bb 1171 MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-matching extended master secret extension" ) );
rahul_dahiya 0:fb8047b156bb 1172 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 1173 MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
rahul_dahiya 0:fb8047b156bb 1174 return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
rahul_dahiya 0:fb8047b156bb 1175 }
rahul_dahiya 0:fb8047b156bb 1176
rahul_dahiya 0:fb8047b156bb 1177 ((void) buf);
rahul_dahiya 0:fb8047b156bb 1178
rahul_dahiya 0:fb8047b156bb 1179 ssl->handshake->extended_ms = MBEDTLS_SSL_EXTENDED_MS_ENABLED;
rahul_dahiya 0:fb8047b156bb 1180
rahul_dahiya 0:fb8047b156bb 1181 return( 0 );
rahul_dahiya 0:fb8047b156bb 1182 }
rahul_dahiya 0:fb8047b156bb 1183 #endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */
rahul_dahiya 0:fb8047b156bb 1184
rahul_dahiya 0:fb8047b156bb 1185 #if defined(MBEDTLS_SSL_SESSION_TICKETS)
rahul_dahiya 0:fb8047b156bb 1186 static int ssl_parse_session_ticket_ext( mbedtls_ssl_context *ssl,
rahul_dahiya 0:fb8047b156bb 1187 const unsigned char *buf,
rahul_dahiya 0:fb8047b156bb 1188 size_t len )
rahul_dahiya 0:fb8047b156bb 1189 {
rahul_dahiya 0:fb8047b156bb 1190 if( ssl->conf->session_tickets == MBEDTLS_SSL_SESSION_TICKETS_DISABLED ||
rahul_dahiya 0:fb8047b156bb 1191 len != 0 )
rahul_dahiya 0:fb8047b156bb 1192 {
rahul_dahiya 0:fb8047b156bb 1193 MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-matching session ticket extension" ) );
rahul_dahiya 0:fb8047b156bb 1194 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 1195 MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
rahul_dahiya 0:fb8047b156bb 1196 return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
rahul_dahiya 0:fb8047b156bb 1197 }
rahul_dahiya 0:fb8047b156bb 1198
rahul_dahiya 0:fb8047b156bb 1199 ((void) buf);
rahul_dahiya 0:fb8047b156bb 1200
rahul_dahiya 0:fb8047b156bb 1201 ssl->handshake->new_session_ticket = 1;
rahul_dahiya 0:fb8047b156bb 1202
rahul_dahiya 0:fb8047b156bb 1203 return( 0 );
rahul_dahiya 0:fb8047b156bb 1204 }
rahul_dahiya 0:fb8047b156bb 1205 #endif /* MBEDTLS_SSL_SESSION_TICKETS */
rahul_dahiya 0:fb8047b156bb 1206
rahul_dahiya 0:fb8047b156bb 1207 #if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \
rahul_dahiya 0:fb8047b156bb 1208 defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
rahul_dahiya 0:fb8047b156bb 1209 static int ssl_parse_supported_point_formats_ext( mbedtls_ssl_context *ssl,
rahul_dahiya 0:fb8047b156bb 1210 const unsigned char *buf,
rahul_dahiya 0:fb8047b156bb 1211 size_t len )
rahul_dahiya 0:fb8047b156bb 1212 {
rahul_dahiya 0:fb8047b156bb 1213 size_t list_size;
rahul_dahiya 0:fb8047b156bb 1214 const unsigned char *p;
rahul_dahiya 0:fb8047b156bb 1215
rahul_dahiya 0:fb8047b156bb 1216 list_size = buf[0];
rahul_dahiya 0:fb8047b156bb 1217 if( list_size + 1 != len )
rahul_dahiya 0:fb8047b156bb 1218 {
rahul_dahiya 0:fb8047b156bb 1219 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
rahul_dahiya 0:fb8047b156bb 1220 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 1221 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
rahul_dahiya 0:fb8047b156bb 1222 return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
rahul_dahiya 0:fb8047b156bb 1223 }
rahul_dahiya 0:fb8047b156bb 1224
rahul_dahiya 0:fb8047b156bb 1225 p = buf + 1;
rahul_dahiya 0:fb8047b156bb 1226 while( list_size > 0 )
rahul_dahiya 0:fb8047b156bb 1227 {
rahul_dahiya 0:fb8047b156bb 1228 if( p[0] == MBEDTLS_ECP_PF_UNCOMPRESSED ||
rahul_dahiya 0:fb8047b156bb 1229 p[0] == MBEDTLS_ECP_PF_COMPRESSED )
rahul_dahiya 0:fb8047b156bb 1230 {
rahul_dahiya 0:fb8047b156bb 1231 #if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C)
rahul_dahiya 0:fb8047b156bb 1232 ssl->handshake->ecdh_ctx.point_format = p[0];
rahul_dahiya 0:fb8047b156bb 1233 #endif
rahul_dahiya 0:fb8047b156bb 1234 #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
rahul_dahiya 0:fb8047b156bb 1235 ssl->handshake->ecjpake_ctx.point_format = p[0];
rahul_dahiya 0:fb8047b156bb 1236 #endif
rahul_dahiya 0:fb8047b156bb 1237 MBEDTLS_SSL_DEBUG_MSG( 4, ( "point format selected: %d", p[0] ) );
rahul_dahiya 0:fb8047b156bb 1238 return( 0 );
rahul_dahiya 0:fb8047b156bb 1239 }
rahul_dahiya 0:fb8047b156bb 1240
rahul_dahiya 0:fb8047b156bb 1241 list_size--;
rahul_dahiya 0:fb8047b156bb 1242 p++;
rahul_dahiya 0:fb8047b156bb 1243 }
rahul_dahiya 0:fb8047b156bb 1244
rahul_dahiya 0:fb8047b156bb 1245 MBEDTLS_SSL_DEBUG_MSG( 1, ( "no point format in common" ) );
rahul_dahiya 0:fb8047b156bb 1246 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 1247 MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
rahul_dahiya 0:fb8047b156bb 1248 return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
rahul_dahiya 0:fb8047b156bb 1249 }
rahul_dahiya 0:fb8047b156bb 1250 #endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C ||
rahul_dahiya 0:fb8047b156bb 1251 MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
rahul_dahiya 0:fb8047b156bb 1252
rahul_dahiya 0:fb8047b156bb 1253 #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
rahul_dahiya 0:fb8047b156bb 1254 static int ssl_parse_ecjpake_kkpp( mbedtls_ssl_context *ssl,
rahul_dahiya 0:fb8047b156bb 1255 const unsigned char *buf,
rahul_dahiya 0:fb8047b156bb 1256 size_t len )
rahul_dahiya 0:fb8047b156bb 1257 {
rahul_dahiya 0:fb8047b156bb 1258 int ret;
rahul_dahiya 0:fb8047b156bb 1259
rahul_dahiya 0:fb8047b156bb 1260 if( ssl->transform_negotiate->ciphersuite_info->key_exchange !=
rahul_dahiya 0:fb8047b156bb 1261 MBEDTLS_KEY_EXCHANGE_ECJPAKE )
rahul_dahiya 0:fb8047b156bb 1262 {
rahul_dahiya 0:fb8047b156bb 1263 MBEDTLS_SSL_DEBUG_MSG( 3, ( "skip ecjpake kkpp extension" ) );
rahul_dahiya 0:fb8047b156bb 1264 return( 0 );
rahul_dahiya 0:fb8047b156bb 1265 }
rahul_dahiya 0:fb8047b156bb 1266
rahul_dahiya 0:fb8047b156bb 1267 /* If we got here, we no longer need our cached extension */
rahul_dahiya 0:fb8047b156bb 1268 mbedtls_free( ssl->handshake->ecjpake_cache );
rahul_dahiya 0:fb8047b156bb 1269 ssl->handshake->ecjpake_cache = NULL;
rahul_dahiya 0:fb8047b156bb 1270 ssl->handshake->ecjpake_cache_len = 0;
rahul_dahiya 0:fb8047b156bb 1271
rahul_dahiya 0:fb8047b156bb 1272 if( ( ret = mbedtls_ecjpake_read_round_one( &ssl->handshake->ecjpake_ctx,
rahul_dahiya 0:fb8047b156bb 1273 buf, len ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 1274 {
rahul_dahiya 0:fb8047b156bb 1275 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_read_round_one", ret );
rahul_dahiya 0:fb8047b156bb 1276 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 1277 MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
rahul_dahiya 0:fb8047b156bb 1278 return( ret );
rahul_dahiya 0:fb8047b156bb 1279 }
rahul_dahiya 0:fb8047b156bb 1280
rahul_dahiya 0:fb8047b156bb 1281 return( 0 );
rahul_dahiya 0:fb8047b156bb 1282 }
rahul_dahiya 0:fb8047b156bb 1283 #endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
rahul_dahiya 0:fb8047b156bb 1284
rahul_dahiya 0:fb8047b156bb 1285 #if defined(MBEDTLS_SSL_ALPN)
rahul_dahiya 0:fb8047b156bb 1286 static int ssl_parse_alpn_ext( mbedtls_ssl_context *ssl,
rahul_dahiya 0:fb8047b156bb 1287 const unsigned char *buf, size_t len )
rahul_dahiya 0:fb8047b156bb 1288 {
rahul_dahiya 0:fb8047b156bb 1289 size_t list_len, name_len;
rahul_dahiya 0:fb8047b156bb 1290 const char **p;
rahul_dahiya 0:fb8047b156bb 1291
rahul_dahiya 0:fb8047b156bb 1292 /* If we didn't send it, the server shouldn't send it */
rahul_dahiya 0:fb8047b156bb 1293 if( ssl->conf->alpn_list == NULL )
rahul_dahiya 0:fb8047b156bb 1294 {
rahul_dahiya 0:fb8047b156bb 1295 MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-matching ALPN extension" ) );
rahul_dahiya 0:fb8047b156bb 1296 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 1297 MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
rahul_dahiya 0:fb8047b156bb 1298 return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
rahul_dahiya 0:fb8047b156bb 1299 }
rahul_dahiya 0:fb8047b156bb 1300
rahul_dahiya 0:fb8047b156bb 1301 /*
rahul_dahiya 0:fb8047b156bb 1302 * opaque ProtocolName<1..2^8-1>;
rahul_dahiya 0:fb8047b156bb 1303 *
rahul_dahiya 0:fb8047b156bb 1304 * struct {
rahul_dahiya 0:fb8047b156bb 1305 * ProtocolName protocol_name_list<2..2^16-1>
rahul_dahiya 0:fb8047b156bb 1306 * } ProtocolNameList;
rahul_dahiya 0:fb8047b156bb 1307 *
rahul_dahiya 0:fb8047b156bb 1308 * the "ProtocolNameList" MUST contain exactly one "ProtocolName"
rahul_dahiya 0:fb8047b156bb 1309 */
rahul_dahiya 0:fb8047b156bb 1310
rahul_dahiya 0:fb8047b156bb 1311 /* Min length is 2 (list_len) + 1 (name_len) + 1 (name) */
rahul_dahiya 0:fb8047b156bb 1312 if( len < 4 )
rahul_dahiya 0:fb8047b156bb 1313 {
rahul_dahiya 0:fb8047b156bb 1314 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 1315 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
rahul_dahiya 0:fb8047b156bb 1316 return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
rahul_dahiya 0:fb8047b156bb 1317 }
rahul_dahiya 0:fb8047b156bb 1318
rahul_dahiya 0:fb8047b156bb 1319 list_len = ( buf[0] << 8 ) | buf[1];
rahul_dahiya 0:fb8047b156bb 1320 if( list_len != len - 2 )
rahul_dahiya 0:fb8047b156bb 1321 {
rahul_dahiya 0:fb8047b156bb 1322 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 1323 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
rahul_dahiya 0:fb8047b156bb 1324 return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
rahul_dahiya 0:fb8047b156bb 1325 }
rahul_dahiya 0:fb8047b156bb 1326
rahul_dahiya 0:fb8047b156bb 1327 name_len = buf[2];
rahul_dahiya 0:fb8047b156bb 1328 if( name_len != list_len - 1 )
rahul_dahiya 0:fb8047b156bb 1329 {
rahul_dahiya 0:fb8047b156bb 1330 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 1331 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
rahul_dahiya 0:fb8047b156bb 1332 return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
rahul_dahiya 0:fb8047b156bb 1333 }
rahul_dahiya 0:fb8047b156bb 1334
rahul_dahiya 0:fb8047b156bb 1335 /* Check that the server chosen protocol was in our list and save it */
rahul_dahiya 0:fb8047b156bb 1336 for( p = ssl->conf->alpn_list; *p != NULL; p++ )
rahul_dahiya 0:fb8047b156bb 1337 {
rahul_dahiya 0:fb8047b156bb 1338 if( name_len == strlen( *p ) &&
rahul_dahiya 0:fb8047b156bb 1339 memcmp( buf + 3, *p, name_len ) == 0 )
rahul_dahiya 0:fb8047b156bb 1340 {
rahul_dahiya 0:fb8047b156bb 1341 ssl->alpn_chosen = *p;
rahul_dahiya 0:fb8047b156bb 1342 return( 0 );
rahul_dahiya 0:fb8047b156bb 1343 }
rahul_dahiya 0:fb8047b156bb 1344 }
rahul_dahiya 0:fb8047b156bb 1345
rahul_dahiya 0:fb8047b156bb 1346 MBEDTLS_SSL_DEBUG_MSG( 1, ( "ALPN extension: no matching protocol" ) );
rahul_dahiya 0:fb8047b156bb 1347 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 1348 MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
rahul_dahiya 0:fb8047b156bb 1349 return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
rahul_dahiya 0:fb8047b156bb 1350 }
rahul_dahiya 0:fb8047b156bb 1351 #endif /* MBEDTLS_SSL_ALPN */
rahul_dahiya 0:fb8047b156bb 1352
rahul_dahiya 0:fb8047b156bb 1353 /*
rahul_dahiya 0:fb8047b156bb 1354 * Parse HelloVerifyRequest. Only called after verifying the HS type.
rahul_dahiya 0:fb8047b156bb 1355 */
rahul_dahiya 0:fb8047b156bb 1356 #if defined(MBEDTLS_SSL_PROTO_DTLS)
rahul_dahiya 0:fb8047b156bb 1357 static int ssl_parse_hello_verify_request( mbedtls_ssl_context *ssl )
rahul_dahiya 0:fb8047b156bb 1358 {
rahul_dahiya 0:fb8047b156bb 1359 const unsigned char *p = ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl );
rahul_dahiya 0:fb8047b156bb 1360 int major_ver, minor_ver;
rahul_dahiya 0:fb8047b156bb 1361 unsigned char cookie_len;
rahul_dahiya 0:fb8047b156bb 1362
rahul_dahiya 0:fb8047b156bb 1363 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse hello verify request" ) );
rahul_dahiya 0:fb8047b156bb 1364
rahul_dahiya 0:fb8047b156bb 1365 /*
rahul_dahiya 0:fb8047b156bb 1366 * struct {
rahul_dahiya 0:fb8047b156bb 1367 * ProtocolVersion server_version;
rahul_dahiya 0:fb8047b156bb 1368 * opaque cookie<0..2^8-1>;
rahul_dahiya 0:fb8047b156bb 1369 * } HelloVerifyRequest;
rahul_dahiya 0:fb8047b156bb 1370 */
rahul_dahiya 0:fb8047b156bb 1371 MBEDTLS_SSL_DEBUG_BUF( 3, "server version", p, 2 );
rahul_dahiya 0:fb8047b156bb 1372 mbedtls_ssl_read_version( &major_ver, &minor_ver, ssl->conf->transport, p );
rahul_dahiya 0:fb8047b156bb 1373 p += 2;
rahul_dahiya 0:fb8047b156bb 1374
rahul_dahiya 0:fb8047b156bb 1375 /*
rahul_dahiya 0:fb8047b156bb 1376 * Since the RFC is not clear on this point, accept DTLS 1.0 (TLS 1.1)
rahul_dahiya 0:fb8047b156bb 1377 * even is lower than our min version.
rahul_dahiya 0:fb8047b156bb 1378 */
rahul_dahiya 0:fb8047b156bb 1379 if( major_ver < MBEDTLS_SSL_MAJOR_VERSION_3 ||
rahul_dahiya 0:fb8047b156bb 1380 minor_ver < MBEDTLS_SSL_MINOR_VERSION_2 ||
rahul_dahiya 0:fb8047b156bb 1381 major_ver > ssl->conf->max_major_ver ||
rahul_dahiya 0:fb8047b156bb 1382 minor_ver > ssl->conf->max_minor_ver )
rahul_dahiya 0:fb8047b156bb 1383 {
rahul_dahiya 0:fb8047b156bb 1384 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server version" ) );
rahul_dahiya 0:fb8047b156bb 1385
rahul_dahiya 0:fb8047b156bb 1386 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 1387 MBEDTLS_SSL_ALERT_MSG_PROTOCOL_VERSION );
rahul_dahiya 0:fb8047b156bb 1388
rahul_dahiya 0:fb8047b156bb 1389 return( MBEDTLS_ERR_SSL_BAD_HS_PROTOCOL_VERSION );
rahul_dahiya 0:fb8047b156bb 1390 }
rahul_dahiya 0:fb8047b156bb 1391
rahul_dahiya 0:fb8047b156bb 1392 cookie_len = *p++;
rahul_dahiya 0:fb8047b156bb 1393 MBEDTLS_SSL_DEBUG_BUF( 3, "cookie", p, cookie_len );
rahul_dahiya 0:fb8047b156bb 1394
rahul_dahiya 0:fb8047b156bb 1395 if( ( ssl->in_msg + ssl->in_msglen ) - p < cookie_len )
rahul_dahiya 0:fb8047b156bb 1396 {
rahul_dahiya 0:fb8047b156bb 1397 MBEDTLS_SSL_DEBUG_MSG( 1,
rahul_dahiya 0:fb8047b156bb 1398 ( "cookie length does not match incoming message size" ) );
rahul_dahiya 0:fb8047b156bb 1399 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 1400 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
rahul_dahiya 0:fb8047b156bb 1401 return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
rahul_dahiya 0:fb8047b156bb 1402 }
rahul_dahiya 0:fb8047b156bb 1403
rahul_dahiya 0:fb8047b156bb 1404 mbedtls_free( ssl->handshake->verify_cookie );
rahul_dahiya 0:fb8047b156bb 1405
rahul_dahiya 0:fb8047b156bb 1406 ssl->handshake->verify_cookie = mbedtls_calloc( 1, cookie_len );
rahul_dahiya 0:fb8047b156bb 1407 if( ssl->handshake->verify_cookie == NULL )
rahul_dahiya 0:fb8047b156bb 1408 {
rahul_dahiya 0:fb8047b156bb 1409 MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc failed (%d bytes)", cookie_len ) );
rahul_dahiya 0:fb8047b156bb 1410 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
rahul_dahiya 0:fb8047b156bb 1411 }
rahul_dahiya 0:fb8047b156bb 1412
rahul_dahiya 0:fb8047b156bb 1413 memcpy( ssl->handshake->verify_cookie, p, cookie_len );
rahul_dahiya 0:fb8047b156bb 1414 ssl->handshake->verify_cookie_len = cookie_len;
rahul_dahiya 0:fb8047b156bb 1415
rahul_dahiya 0:fb8047b156bb 1416 /* Start over at ClientHello */
rahul_dahiya 0:fb8047b156bb 1417 ssl->state = MBEDTLS_SSL_CLIENT_HELLO;
rahul_dahiya 0:fb8047b156bb 1418 mbedtls_ssl_reset_checksum( ssl );
rahul_dahiya 0:fb8047b156bb 1419
rahul_dahiya 0:fb8047b156bb 1420 mbedtls_ssl_recv_flight_completed( ssl );
rahul_dahiya 0:fb8047b156bb 1421
rahul_dahiya 0:fb8047b156bb 1422 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse hello verify request" ) );
rahul_dahiya 0:fb8047b156bb 1423
rahul_dahiya 0:fb8047b156bb 1424 return( 0 );
rahul_dahiya 0:fb8047b156bb 1425 }
rahul_dahiya 0:fb8047b156bb 1426 #endif /* MBEDTLS_SSL_PROTO_DTLS */
rahul_dahiya 0:fb8047b156bb 1427
rahul_dahiya 0:fb8047b156bb 1428 static int ssl_parse_server_hello( mbedtls_ssl_context *ssl )
rahul_dahiya 0:fb8047b156bb 1429 {
rahul_dahiya 0:fb8047b156bb 1430 int ret, i;
rahul_dahiya 0:fb8047b156bb 1431 size_t n;
rahul_dahiya 0:fb8047b156bb 1432 size_t ext_len;
rahul_dahiya 0:fb8047b156bb 1433 unsigned char *buf, *ext;
rahul_dahiya 0:fb8047b156bb 1434 unsigned char comp;
rahul_dahiya 0:fb8047b156bb 1435 #if defined(MBEDTLS_ZLIB_SUPPORT)
rahul_dahiya 0:fb8047b156bb 1436 int accept_comp;
rahul_dahiya 0:fb8047b156bb 1437 #endif
rahul_dahiya 0:fb8047b156bb 1438 #if defined(MBEDTLS_SSL_RENEGOTIATION)
rahul_dahiya 0:fb8047b156bb 1439 int renegotiation_info_seen = 0;
rahul_dahiya 0:fb8047b156bb 1440 #endif
rahul_dahiya 0:fb8047b156bb 1441 int handshake_failure = 0;
rahul_dahiya 0:fb8047b156bb 1442 const mbedtls_ssl_ciphersuite_t *suite_info;
rahul_dahiya 0:fb8047b156bb 1443 #if defined(MBEDTLS_DEBUG_C)
rahul_dahiya 0:fb8047b156bb 1444 uint32_t t;
rahul_dahiya 0:fb8047b156bb 1445 #endif
rahul_dahiya 0:fb8047b156bb 1446
rahul_dahiya 0:fb8047b156bb 1447 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse server hello" ) );
rahul_dahiya 0:fb8047b156bb 1448
rahul_dahiya 0:fb8047b156bb 1449 buf = ssl->in_msg;
rahul_dahiya 0:fb8047b156bb 1450
rahul_dahiya 0:fb8047b156bb 1451 if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 1452 {
rahul_dahiya 0:fb8047b156bb 1453 /* No alert on a read error. */
rahul_dahiya 0:fb8047b156bb 1454 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
rahul_dahiya 0:fb8047b156bb 1455 return( ret );
rahul_dahiya 0:fb8047b156bb 1456 }
rahul_dahiya 0:fb8047b156bb 1457
rahul_dahiya 0:fb8047b156bb 1458 if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE )
rahul_dahiya 0:fb8047b156bb 1459 {
rahul_dahiya 0:fb8047b156bb 1460 #if defined(MBEDTLS_SSL_RENEGOTIATION)
rahul_dahiya 0:fb8047b156bb 1461 if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
rahul_dahiya 0:fb8047b156bb 1462 {
rahul_dahiya 0:fb8047b156bb 1463 ssl->renego_records_seen++;
rahul_dahiya 0:fb8047b156bb 1464
rahul_dahiya 0:fb8047b156bb 1465 if( ssl->conf->renego_max_records >= 0 &&
rahul_dahiya 0:fb8047b156bb 1466 ssl->renego_records_seen > ssl->conf->renego_max_records )
rahul_dahiya 0:fb8047b156bb 1467 {
rahul_dahiya 0:fb8047b156bb 1468 MBEDTLS_SSL_DEBUG_MSG( 1, ( "renegotiation requested, "
rahul_dahiya 0:fb8047b156bb 1469 "but not honored by server" ) );
rahul_dahiya 0:fb8047b156bb 1470 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
rahul_dahiya 0:fb8047b156bb 1471 }
rahul_dahiya 0:fb8047b156bb 1472
rahul_dahiya 0:fb8047b156bb 1473 MBEDTLS_SSL_DEBUG_MSG( 1, ( "non-handshake message during renego" ) );
rahul_dahiya 0:fb8047b156bb 1474
rahul_dahiya 0:fb8047b156bb 1475 ssl->keep_current_message = 1;
rahul_dahiya 0:fb8047b156bb 1476 return( MBEDTLS_ERR_SSL_WAITING_SERVER_HELLO_RENEGO );
rahul_dahiya 0:fb8047b156bb 1477 }
rahul_dahiya 0:fb8047b156bb 1478 #endif /* MBEDTLS_SSL_RENEGOTIATION */
rahul_dahiya 0:fb8047b156bb 1479
rahul_dahiya 0:fb8047b156bb 1480 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
rahul_dahiya 0:fb8047b156bb 1481 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 1482 MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE );
rahul_dahiya 0:fb8047b156bb 1483 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
rahul_dahiya 0:fb8047b156bb 1484 }
rahul_dahiya 0:fb8047b156bb 1485
rahul_dahiya 0:fb8047b156bb 1486 #if defined(MBEDTLS_SSL_PROTO_DTLS)
rahul_dahiya 0:fb8047b156bb 1487 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
rahul_dahiya 0:fb8047b156bb 1488 {
rahul_dahiya 0:fb8047b156bb 1489 if( buf[0] == MBEDTLS_SSL_HS_HELLO_VERIFY_REQUEST )
rahul_dahiya 0:fb8047b156bb 1490 {
rahul_dahiya 0:fb8047b156bb 1491 MBEDTLS_SSL_DEBUG_MSG( 2, ( "received hello verify request" ) );
rahul_dahiya 0:fb8047b156bb 1492 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse server hello" ) );
rahul_dahiya 0:fb8047b156bb 1493 return( ssl_parse_hello_verify_request( ssl ) );
rahul_dahiya 0:fb8047b156bb 1494 }
rahul_dahiya 0:fb8047b156bb 1495 else
rahul_dahiya 0:fb8047b156bb 1496 {
rahul_dahiya 0:fb8047b156bb 1497 /* We made it through the verification process */
rahul_dahiya 0:fb8047b156bb 1498 mbedtls_free( ssl->handshake->verify_cookie );
rahul_dahiya 0:fb8047b156bb 1499 ssl->handshake->verify_cookie = NULL;
rahul_dahiya 0:fb8047b156bb 1500 ssl->handshake->verify_cookie_len = 0;
rahul_dahiya 0:fb8047b156bb 1501 }
rahul_dahiya 0:fb8047b156bb 1502 }
rahul_dahiya 0:fb8047b156bb 1503 #endif /* MBEDTLS_SSL_PROTO_DTLS */
rahul_dahiya 0:fb8047b156bb 1504
rahul_dahiya 0:fb8047b156bb 1505 if( ssl->in_hslen < 38 + mbedtls_ssl_hs_hdr_len( ssl ) ||
rahul_dahiya 0:fb8047b156bb 1506 buf[0] != MBEDTLS_SSL_HS_SERVER_HELLO )
rahul_dahiya 0:fb8047b156bb 1507 {
rahul_dahiya 0:fb8047b156bb 1508 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
rahul_dahiya 0:fb8047b156bb 1509 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 1510 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
rahul_dahiya 0:fb8047b156bb 1511 return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
rahul_dahiya 0:fb8047b156bb 1512 }
rahul_dahiya 0:fb8047b156bb 1513
rahul_dahiya 0:fb8047b156bb 1514 /*
rahul_dahiya 0:fb8047b156bb 1515 * 0 . 1 server_version
rahul_dahiya 0:fb8047b156bb 1516 * 2 . 33 random (maybe including 4 bytes of Unix time)
rahul_dahiya 0:fb8047b156bb 1517 * 34 . 34 session_id length = n
rahul_dahiya 0:fb8047b156bb 1518 * 35 . 34+n session_id
rahul_dahiya 0:fb8047b156bb 1519 * 35+n . 36+n cipher_suite
rahul_dahiya 0:fb8047b156bb 1520 * 37+n . 37+n compression_method
rahul_dahiya 0:fb8047b156bb 1521 *
rahul_dahiya 0:fb8047b156bb 1522 * 38+n . 39+n extensions length (optional)
rahul_dahiya 0:fb8047b156bb 1523 * 40+n . .. extensions
rahul_dahiya 0:fb8047b156bb 1524 */
rahul_dahiya 0:fb8047b156bb 1525 buf += mbedtls_ssl_hs_hdr_len( ssl );
rahul_dahiya 0:fb8047b156bb 1526
rahul_dahiya 0:fb8047b156bb 1527 MBEDTLS_SSL_DEBUG_BUF( 3, "server hello, version", buf + 0, 2 );
rahul_dahiya 0:fb8047b156bb 1528 mbedtls_ssl_read_version( &ssl->major_ver, &ssl->minor_ver,
rahul_dahiya 0:fb8047b156bb 1529 ssl->conf->transport, buf + 0 );
rahul_dahiya 0:fb8047b156bb 1530
rahul_dahiya 0:fb8047b156bb 1531 if( ssl->major_ver < ssl->conf->min_major_ver ||
rahul_dahiya 0:fb8047b156bb 1532 ssl->minor_ver < ssl->conf->min_minor_ver ||
rahul_dahiya 0:fb8047b156bb 1533 ssl->major_ver > ssl->conf->max_major_ver ||
rahul_dahiya 0:fb8047b156bb 1534 ssl->minor_ver > ssl->conf->max_minor_ver )
rahul_dahiya 0:fb8047b156bb 1535 {
rahul_dahiya 0:fb8047b156bb 1536 MBEDTLS_SSL_DEBUG_MSG( 1, ( "server version out of bounds - "
rahul_dahiya 0:fb8047b156bb 1537 " min: [%d:%d], server: [%d:%d], max: [%d:%d]",
rahul_dahiya 0:fb8047b156bb 1538 ssl->conf->min_major_ver, ssl->conf->min_minor_ver,
rahul_dahiya 0:fb8047b156bb 1539 ssl->major_ver, ssl->minor_ver,
rahul_dahiya 0:fb8047b156bb 1540 ssl->conf->max_major_ver, ssl->conf->max_minor_ver ) );
rahul_dahiya 0:fb8047b156bb 1541
rahul_dahiya 0:fb8047b156bb 1542 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 1543 MBEDTLS_SSL_ALERT_MSG_PROTOCOL_VERSION );
rahul_dahiya 0:fb8047b156bb 1544
rahul_dahiya 0:fb8047b156bb 1545 return( MBEDTLS_ERR_SSL_BAD_HS_PROTOCOL_VERSION );
rahul_dahiya 0:fb8047b156bb 1546 }
rahul_dahiya 0:fb8047b156bb 1547
rahul_dahiya 0:fb8047b156bb 1548 #if defined(MBEDTLS_DEBUG_C)
rahul_dahiya 0:fb8047b156bb 1549 t = ( (uint32_t) buf[2] << 24 )
rahul_dahiya 0:fb8047b156bb 1550 | ( (uint32_t) buf[3] << 16 )
rahul_dahiya 0:fb8047b156bb 1551 | ( (uint32_t) buf[4] << 8 )
rahul_dahiya 0:fb8047b156bb 1552 | ( (uint32_t) buf[5] );
rahul_dahiya 0:fb8047b156bb 1553 MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, current time: %lu", t ) );
rahul_dahiya 0:fb8047b156bb 1554 #endif
rahul_dahiya 0:fb8047b156bb 1555
rahul_dahiya 0:fb8047b156bb 1556 memcpy( ssl->handshake->randbytes + 32, buf + 2, 32 );
rahul_dahiya 0:fb8047b156bb 1557
rahul_dahiya 0:fb8047b156bb 1558 n = buf[34];
rahul_dahiya 0:fb8047b156bb 1559
rahul_dahiya 0:fb8047b156bb 1560 MBEDTLS_SSL_DEBUG_BUF( 3, "server hello, random bytes", buf + 2, 32 );
rahul_dahiya 0:fb8047b156bb 1561
rahul_dahiya 0:fb8047b156bb 1562 if( n > 32 )
rahul_dahiya 0:fb8047b156bb 1563 {
rahul_dahiya 0:fb8047b156bb 1564 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
rahul_dahiya 0:fb8047b156bb 1565 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 1566 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
rahul_dahiya 0:fb8047b156bb 1567 return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
rahul_dahiya 0:fb8047b156bb 1568 }
rahul_dahiya 0:fb8047b156bb 1569
rahul_dahiya 0:fb8047b156bb 1570 if( ssl->in_hslen > mbedtls_ssl_hs_hdr_len( ssl ) + 39 + n )
rahul_dahiya 0:fb8047b156bb 1571 {
rahul_dahiya 0:fb8047b156bb 1572 ext_len = ( ( buf[38 + n] << 8 )
rahul_dahiya 0:fb8047b156bb 1573 | ( buf[39 + n] ) );
rahul_dahiya 0:fb8047b156bb 1574
rahul_dahiya 0:fb8047b156bb 1575 if( ( ext_len > 0 && ext_len < 4 ) ||
rahul_dahiya 0:fb8047b156bb 1576 ssl->in_hslen != mbedtls_ssl_hs_hdr_len( ssl ) + 40 + n + ext_len )
rahul_dahiya 0:fb8047b156bb 1577 {
rahul_dahiya 0:fb8047b156bb 1578 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
rahul_dahiya 0:fb8047b156bb 1579 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 1580 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
rahul_dahiya 0:fb8047b156bb 1581 return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
rahul_dahiya 0:fb8047b156bb 1582 }
rahul_dahiya 0:fb8047b156bb 1583 }
rahul_dahiya 0:fb8047b156bb 1584 else if( ssl->in_hslen == mbedtls_ssl_hs_hdr_len( ssl ) + 38 + n )
rahul_dahiya 0:fb8047b156bb 1585 {
rahul_dahiya 0:fb8047b156bb 1586 ext_len = 0;
rahul_dahiya 0:fb8047b156bb 1587 }
rahul_dahiya 0:fb8047b156bb 1588 else
rahul_dahiya 0:fb8047b156bb 1589 {
rahul_dahiya 0:fb8047b156bb 1590 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
rahul_dahiya 0:fb8047b156bb 1591 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 1592 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
rahul_dahiya 0:fb8047b156bb 1593 return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
rahul_dahiya 0:fb8047b156bb 1594 }
rahul_dahiya 0:fb8047b156bb 1595
rahul_dahiya 0:fb8047b156bb 1596 /* ciphersuite (used later) */
rahul_dahiya 0:fb8047b156bb 1597 i = ( buf[35 + n] << 8 ) | buf[36 + n];
rahul_dahiya 0:fb8047b156bb 1598
rahul_dahiya 0:fb8047b156bb 1599 /*
rahul_dahiya 0:fb8047b156bb 1600 * Read and check compression
rahul_dahiya 0:fb8047b156bb 1601 */
rahul_dahiya 0:fb8047b156bb 1602 comp = buf[37 + n];
rahul_dahiya 0:fb8047b156bb 1603
rahul_dahiya 0:fb8047b156bb 1604 #if defined(MBEDTLS_ZLIB_SUPPORT)
rahul_dahiya 0:fb8047b156bb 1605 /* See comments in ssl_write_client_hello() */
rahul_dahiya 0:fb8047b156bb 1606 #if defined(MBEDTLS_SSL_PROTO_DTLS)
rahul_dahiya 0:fb8047b156bb 1607 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
rahul_dahiya 0:fb8047b156bb 1608 accept_comp = 0;
rahul_dahiya 0:fb8047b156bb 1609 else
rahul_dahiya 0:fb8047b156bb 1610 #endif
rahul_dahiya 0:fb8047b156bb 1611 accept_comp = 1;
rahul_dahiya 0:fb8047b156bb 1612
rahul_dahiya 0:fb8047b156bb 1613 if( comp != MBEDTLS_SSL_COMPRESS_NULL &&
rahul_dahiya 0:fb8047b156bb 1614 ( comp != MBEDTLS_SSL_COMPRESS_DEFLATE || accept_comp == 0 ) )
rahul_dahiya 0:fb8047b156bb 1615 #else /* MBEDTLS_ZLIB_SUPPORT */
rahul_dahiya 0:fb8047b156bb 1616 if( comp != MBEDTLS_SSL_COMPRESS_NULL )
rahul_dahiya 0:fb8047b156bb 1617 #endif/* MBEDTLS_ZLIB_SUPPORT */
rahul_dahiya 0:fb8047b156bb 1618 {
rahul_dahiya 0:fb8047b156bb 1619 MBEDTLS_SSL_DEBUG_MSG( 1, ( "server hello, bad compression: %d", comp ) );
rahul_dahiya 0:fb8047b156bb 1620 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 1621 MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
rahul_dahiya 0:fb8047b156bb 1622 return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
rahul_dahiya 0:fb8047b156bb 1623 }
rahul_dahiya 0:fb8047b156bb 1624
rahul_dahiya 0:fb8047b156bb 1625 /*
rahul_dahiya 0:fb8047b156bb 1626 * Initialize update checksum functions
rahul_dahiya 0:fb8047b156bb 1627 */
rahul_dahiya 0:fb8047b156bb 1628 ssl->transform_negotiate->ciphersuite_info = mbedtls_ssl_ciphersuite_from_id( i );
rahul_dahiya 0:fb8047b156bb 1629
rahul_dahiya 0:fb8047b156bb 1630 if( ssl->transform_negotiate->ciphersuite_info == NULL )
rahul_dahiya 0:fb8047b156bb 1631 {
rahul_dahiya 0:fb8047b156bb 1632 MBEDTLS_SSL_DEBUG_MSG( 1, ( "ciphersuite info for %04x not found", i ) );
rahul_dahiya 0:fb8047b156bb 1633 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 1634 MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR );
rahul_dahiya 0:fb8047b156bb 1635 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
rahul_dahiya 0:fb8047b156bb 1636 }
rahul_dahiya 0:fb8047b156bb 1637
rahul_dahiya 0:fb8047b156bb 1638 mbedtls_ssl_optimize_checksum( ssl, ssl->transform_negotiate->ciphersuite_info );
rahul_dahiya 0:fb8047b156bb 1639
rahul_dahiya 0:fb8047b156bb 1640 MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, session id len.: %d", n ) );
rahul_dahiya 0:fb8047b156bb 1641 MBEDTLS_SSL_DEBUG_BUF( 3, "server hello, session id", buf + 35, n );
rahul_dahiya 0:fb8047b156bb 1642
rahul_dahiya 0:fb8047b156bb 1643 /*
rahul_dahiya 0:fb8047b156bb 1644 * Check if the session can be resumed
rahul_dahiya 0:fb8047b156bb 1645 */
rahul_dahiya 0:fb8047b156bb 1646 if( ssl->handshake->resume == 0 || n == 0 ||
rahul_dahiya 0:fb8047b156bb 1647 #if defined(MBEDTLS_SSL_RENEGOTIATION)
rahul_dahiya 0:fb8047b156bb 1648 ssl->renego_status != MBEDTLS_SSL_INITIAL_HANDSHAKE ||
rahul_dahiya 0:fb8047b156bb 1649 #endif
rahul_dahiya 0:fb8047b156bb 1650 ssl->session_negotiate->ciphersuite != i ||
rahul_dahiya 0:fb8047b156bb 1651 ssl->session_negotiate->compression != comp ||
rahul_dahiya 0:fb8047b156bb 1652 ssl->session_negotiate->id_len != n ||
rahul_dahiya 0:fb8047b156bb 1653 memcmp( ssl->session_negotiate->id, buf + 35, n ) != 0 )
rahul_dahiya 0:fb8047b156bb 1654 {
rahul_dahiya 0:fb8047b156bb 1655 ssl->state++;
rahul_dahiya 0:fb8047b156bb 1656 ssl->handshake->resume = 0;
rahul_dahiya 0:fb8047b156bb 1657 #if defined(MBEDTLS_HAVE_TIME)
rahul_dahiya 0:fb8047b156bb 1658 ssl->session_negotiate->start = mbedtls_time( NULL );
rahul_dahiya 0:fb8047b156bb 1659 #endif
rahul_dahiya 0:fb8047b156bb 1660 ssl->session_negotiate->ciphersuite = i;
rahul_dahiya 0:fb8047b156bb 1661 ssl->session_negotiate->compression = comp;
rahul_dahiya 0:fb8047b156bb 1662 ssl->session_negotiate->id_len = n;
rahul_dahiya 0:fb8047b156bb 1663 memcpy( ssl->session_negotiate->id, buf + 35, n );
rahul_dahiya 0:fb8047b156bb 1664 }
rahul_dahiya 0:fb8047b156bb 1665 else
rahul_dahiya 0:fb8047b156bb 1666 {
rahul_dahiya 0:fb8047b156bb 1667 ssl->state = MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC;
rahul_dahiya 0:fb8047b156bb 1668
rahul_dahiya 0:fb8047b156bb 1669 if( ( ret = mbedtls_ssl_derive_keys( ssl ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 1670 {
rahul_dahiya 0:fb8047b156bb 1671 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_derive_keys", ret );
rahul_dahiya 0:fb8047b156bb 1672 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 1673 MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR );
rahul_dahiya 0:fb8047b156bb 1674 return( ret );
rahul_dahiya 0:fb8047b156bb 1675 }
rahul_dahiya 0:fb8047b156bb 1676 }
rahul_dahiya 0:fb8047b156bb 1677
rahul_dahiya 0:fb8047b156bb 1678 MBEDTLS_SSL_DEBUG_MSG( 3, ( "%s session has been resumed",
rahul_dahiya 0:fb8047b156bb 1679 ssl->handshake->resume ? "a" : "no" ) );
rahul_dahiya 0:fb8047b156bb 1680
rahul_dahiya 0:fb8047b156bb 1681 MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, chosen ciphersuite: %04x", i ) );
rahul_dahiya 0:fb8047b156bb 1682 MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, compress alg.: %d", buf[37 + n] ) );
rahul_dahiya 0:fb8047b156bb 1683
rahul_dahiya 0:fb8047b156bb 1684 suite_info = mbedtls_ssl_ciphersuite_from_id( ssl->session_negotiate->ciphersuite );
rahul_dahiya 0:fb8047b156bb 1685 if( suite_info == NULL
rahul_dahiya 0:fb8047b156bb 1686 #if defined(MBEDTLS_ARC4_C)
rahul_dahiya 0:fb8047b156bb 1687 || ( ssl->conf->arc4_disabled &&
rahul_dahiya 0:fb8047b156bb 1688 suite_info->cipher == MBEDTLS_CIPHER_ARC4_128 )
rahul_dahiya 0:fb8047b156bb 1689 #endif
rahul_dahiya 0:fb8047b156bb 1690 )
rahul_dahiya 0:fb8047b156bb 1691 {
rahul_dahiya 0:fb8047b156bb 1692 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
rahul_dahiya 0:fb8047b156bb 1693 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 1694 MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
rahul_dahiya 0:fb8047b156bb 1695 return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
rahul_dahiya 0:fb8047b156bb 1696 }
rahul_dahiya 0:fb8047b156bb 1697
rahul_dahiya 0:fb8047b156bb 1698 MBEDTLS_SSL_DEBUG_MSG( 3, ( "server hello, chosen ciphersuite: %s", suite_info->name ) );
rahul_dahiya 0:fb8047b156bb 1699
rahul_dahiya 0:fb8047b156bb 1700 i = 0;
rahul_dahiya 0:fb8047b156bb 1701 while( 1 )
rahul_dahiya 0:fb8047b156bb 1702 {
rahul_dahiya 0:fb8047b156bb 1703 if( ssl->conf->ciphersuite_list[ssl->minor_ver][i] == 0 )
rahul_dahiya 0:fb8047b156bb 1704 {
rahul_dahiya 0:fb8047b156bb 1705 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
rahul_dahiya 0:fb8047b156bb 1706 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 1707 MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
rahul_dahiya 0:fb8047b156bb 1708 return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
rahul_dahiya 0:fb8047b156bb 1709 }
rahul_dahiya 0:fb8047b156bb 1710
rahul_dahiya 0:fb8047b156bb 1711 if( ssl->conf->ciphersuite_list[ssl->minor_ver][i++] ==
rahul_dahiya 0:fb8047b156bb 1712 ssl->session_negotiate->ciphersuite )
rahul_dahiya 0:fb8047b156bb 1713 {
rahul_dahiya 0:fb8047b156bb 1714 break;
rahul_dahiya 0:fb8047b156bb 1715 }
rahul_dahiya 0:fb8047b156bb 1716 }
rahul_dahiya 0:fb8047b156bb 1717
rahul_dahiya 0:fb8047b156bb 1718 if( comp != MBEDTLS_SSL_COMPRESS_NULL
rahul_dahiya 0:fb8047b156bb 1719 #if defined(MBEDTLS_ZLIB_SUPPORT)
rahul_dahiya 0:fb8047b156bb 1720 && comp != MBEDTLS_SSL_COMPRESS_DEFLATE
rahul_dahiya 0:fb8047b156bb 1721 #endif
rahul_dahiya 0:fb8047b156bb 1722 )
rahul_dahiya 0:fb8047b156bb 1723 {
rahul_dahiya 0:fb8047b156bb 1724 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
rahul_dahiya 0:fb8047b156bb 1725 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 1726 MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
rahul_dahiya 0:fb8047b156bb 1727 return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
rahul_dahiya 0:fb8047b156bb 1728 }
rahul_dahiya 0:fb8047b156bb 1729 ssl->session_negotiate->compression = comp;
rahul_dahiya 0:fb8047b156bb 1730
rahul_dahiya 0:fb8047b156bb 1731 ext = buf + 40 + n;
rahul_dahiya 0:fb8047b156bb 1732
rahul_dahiya 0:fb8047b156bb 1733 MBEDTLS_SSL_DEBUG_MSG( 2, ( "server hello, total extension length: %d", ext_len ) );
rahul_dahiya 0:fb8047b156bb 1734
rahul_dahiya 0:fb8047b156bb 1735 while( ext_len )
rahul_dahiya 0:fb8047b156bb 1736 {
rahul_dahiya 0:fb8047b156bb 1737 unsigned int ext_id = ( ( ext[0] << 8 )
rahul_dahiya 0:fb8047b156bb 1738 | ( ext[1] ) );
rahul_dahiya 0:fb8047b156bb 1739 unsigned int ext_size = ( ( ext[2] << 8 )
rahul_dahiya 0:fb8047b156bb 1740 | ( ext[3] ) );
rahul_dahiya 0:fb8047b156bb 1741
rahul_dahiya 0:fb8047b156bb 1742 if( ext_size + 4 > ext_len )
rahul_dahiya 0:fb8047b156bb 1743 {
rahul_dahiya 0:fb8047b156bb 1744 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
rahul_dahiya 0:fb8047b156bb 1745 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 1746 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
rahul_dahiya 0:fb8047b156bb 1747 return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
rahul_dahiya 0:fb8047b156bb 1748 }
rahul_dahiya 0:fb8047b156bb 1749
rahul_dahiya 0:fb8047b156bb 1750 switch( ext_id )
rahul_dahiya 0:fb8047b156bb 1751 {
rahul_dahiya 0:fb8047b156bb 1752 case MBEDTLS_TLS_EXT_RENEGOTIATION_INFO:
rahul_dahiya 0:fb8047b156bb 1753 MBEDTLS_SSL_DEBUG_MSG( 3, ( "found renegotiation extension" ) );
rahul_dahiya 0:fb8047b156bb 1754 #if defined(MBEDTLS_SSL_RENEGOTIATION)
rahul_dahiya 0:fb8047b156bb 1755 renegotiation_info_seen = 1;
rahul_dahiya 0:fb8047b156bb 1756 #endif
rahul_dahiya 0:fb8047b156bb 1757
rahul_dahiya 0:fb8047b156bb 1758 if( ( ret = ssl_parse_renegotiation_info( ssl, ext + 4,
rahul_dahiya 0:fb8047b156bb 1759 ext_size ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 1760 return( ret );
rahul_dahiya 0:fb8047b156bb 1761
rahul_dahiya 0:fb8047b156bb 1762 break;
rahul_dahiya 0:fb8047b156bb 1763
rahul_dahiya 0:fb8047b156bb 1764 #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
rahul_dahiya 0:fb8047b156bb 1765 case MBEDTLS_TLS_EXT_MAX_FRAGMENT_LENGTH:
rahul_dahiya 0:fb8047b156bb 1766 MBEDTLS_SSL_DEBUG_MSG( 3, ( "found max_fragment_length extension" ) );
rahul_dahiya 0:fb8047b156bb 1767
rahul_dahiya 0:fb8047b156bb 1768 if( ( ret = ssl_parse_max_fragment_length_ext( ssl,
rahul_dahiya 0:fb8047b156bb 1769 ext + 4, ext_size ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 1770 {
rahul_dahiya 0:fb8047b156bb 1771 return( ret );
rahul_dahiya 0:fb8047b156bb 1772 }
rahul_dahiya 0:fb8047b156bb 1773
rahul_dahiya 0:fb8047b156bb 1774 break;
rahul_dahiya 0:fb8047b156bb 1775 #endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
rahul_dahiya 0:fb8047b156bb 1776
rahul_dahiya 0:fb8047b156bb 1777 #if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
rahul_dahiya 0:fb8047b156bb 1778 case MBEDTLS_TLS_EXT_TRUNCATED_HMAC:
rahul_dahiya 0:fb8047b156bb 1779 MBEDTLS_SSL_DEBUG_MSG( 3, ( "found truncated_hmac extension" ) );
rahul_dahiya 0:fb8047b156bb 1780
rahul_dahiya 0:fb8047b156bb 1781 if( ( ret = ssl_parse_truncated_hmac_ext( ssl,
rahul_dahiya 0:fb8047b156bb 1782 ext + 4, ext_size ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 1783 {
rahul_dahiya 0:fb8047b156bb 1784 return( ret );
rahul_dahiya 0:fb8047b156bb 1785 }
rahul_dahiya 0:fb8047b156bb 1786
rahul_dahiya 0:fb8047b156bb 1787 break;
rahul_dahiya 0:fb8047b156bb 1788 #endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
rahul_dahiya 0:fb8047b156bb 1789
rahul_dahiya 0:fb8047b156bb 1790 #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
rahul_dahiya 0:fb8047b156bb 1791 case MBEDTLS_TLS_EXT_ENCRYPT_THEN_MAC:
rahul_dahiya 0:fb8047b156bb 1792 MBEDTLS_SSL_DEBUG_MSG( 3, ( "found encrypt_then_mac extension" ) );
rahul_dahiya 0:fb8047b156bb 1793
rahul_dahiya 0:fb8047b156bb 1794 if( ( ret = ssl_parse_encrypt_then_mac_ext( ssl,
rahul_dahiya 0:fb8047b156bb 1795 ext + 4, ext_size ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 1796 {
rahul_dahiya 0:fb8047b156bb 1797 return( ret );
rahul_dahiya 0:fb8047b156bb 1798 }
rahul_dahiya 0:fb8047b156bb 1799
rahul_dahiya 0:fb8047b156bb 1800 break;
rahul_dahiya 0:fb8047b156bb 1801 #endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
rahul_dahiya 0:fb8047b156bb 1802
rahul_dahiya 0:fb8047b156bb 1803 #if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
rahul_dahiya 0:fb8047b156bb 1804 case MBEDTLS_TLS_EXT_EXTENDED_MASTER_SECRET:
rahul_dahiya 0:fb8047b156bb 1805 MBEDTLS_SSL_DEBUG_MSG( 3, ( "found extended_master_secret extension" ) );
rahul_dahiya 0:fb8047b156bb 1806
rahul_dahiya 0:fb8047b156bb 1807 if( ( ret = ssl_parse_extended_ms_ext( ssl,
rahul_dahiya 0:fb8047b156bb 1808 ext + 4, ext_size ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 1809 {
rahul_dahiya 0:fb8047b156bb 1810 return( ret );
rahul_dahiya 0:fb8047b156bb 1811 }
rahul_dahiya 0:fb8047b156bb 1812
rahul_dahiya 0:fb8047b156bb 1813 break;
rahul_dahiya 0:fb8047b156bb 1814 #endif /* MBEDTLS_SSL_EXTENDED_MASTER_SECRET */
rahul_dahiya 0:fb8047b156bb 1815
rahul_dahiya 0:fb8047b156bb 1816 #if defined(MBEDTLS_SSL_SESSION_TICKETS)
rahul_dahiya 0:fb8047b156bb 1817 case MBEDTLS_TLS_EXT_SESSION_TICKET:
rahul_dahiya 0:fb8047b156bb 1818 MBEDTLS_SSL_DEBUG_MSG( 3, ( "found session_ticket extension" ) );
rahul_dahiya 0:fb8047b156bb 1819
rahul_dahiya 0:fb8047b156bb 1820 if( ( ret = ssl_parse_session_ticket_ext( ssl,
rahul_dahiya 0:fb8047b156bb 1821 ext + 4, ext_size ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 1822 {
rahul_dahiya 0:fb8047b156bb 1823 return( ret );
rahul_dahiya 0:fb8047b156bb 1824 }
rahul_dahiya 0:fb8047b156bb 1825
rahul_dahiya 0:fb8047b156bb 1826 break;
rahul_dahiya 0:fb8047b156bb 1827 #endif /* MBEDTLS_SSL_SESSION_TICKETS */
rahul_dahiya 0:fb8047b156bb 1828
rahul_dahiya 0:fb8047b156bb 1829 #if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \
rahul_dahiya 0:fb8047b156bb 1830 defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
rahul_dahiya 0:fb8047b156bb 1831 case MBEDTLS_TLS_EXT_SUPPORTED_POINT_FORMATS:
rahul_dahiya 0:fb8047b156bb 1832 MBEDTLS_SSL_DEBUG_MSG( 3, ( "found supported_point_formats extension" ) );
rahul_dahiya 0:fb8047b156bb 1833
rahul_dahiya 0:fb8047b156bb 1834 if( ( ret = ssl_parse_supported_point_formats_ext( ssl,
rahul_dahiya 0:fb8047b156bb 1835 ext + 4, ext_size ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 1836 {
rahul_dahiya 0:fb8047b156bb 1837 return( ret );
rahul_dahiya 0:fb8047b156bb 1838 }
rahul_dahiya 0:fb8047b156bb 1839
rahul_dahiya 0:fb8047b156bb 1840 break;
rahul_dahiya 0:fb8047b156bb 1841 #endif /* MBEDTLS_ECDH_C || MBEDTLS_ECDSA_C ||
rahul_dahiya 0:fb8047b156bb 1842 MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
rahul_dahiya 0:fb8047b156bb 1843
rahul_dahiya 0:fb8047b156bb 1844 #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
rahul_dahiya 0:fb8047b156bb 1845 case MBEDTLS_TLS_EXT_ECJPAKE_KKPP:
rahul_dahiya 0:fb8047b156bb 1846 MBEDTLS_SSL_DEBUG_MSG( 3, ( "found ecjpake_kkpp extension" ) );
rahul_dahiya 0:fb8047b156bb 1847
rahul_dahiya 0:fb8047b156bb 1848 if( ( ret = ssl_parse_ecjpake_kkpp( ssl,
rahul_dahiya 0:fb8047b156bb 1849 ext + 4, ext_size ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 1850 {
rahul_dahiya 0:fb8047b156bb 1851 return( ret );
rahul_dahiya 0:fb8047b156bb 1852 }
rahul_dahiya 0:fb8047b156bb 1853
rahul_dahiya 0:fb8047b156bb 1854 break;
rahul_dahiya 0:fb8047b156bb 1855 #endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
rahul_dahiya 0:fb8047b156bb 1856
rahul_dahiya 0:fb8047b156bb 1857 #if defined(MBEDTLS_SSL_ALPN)
rahul_dahiya 0:fb8047b156bb 1858 case MBEDTLS_TLS_EXT_ALPN:
rahul_dahiya 0:fb8047b156bb 1859 MBEDTLS_SSL_DEBUG_MSG( 3, ( "found alpn extension" ) );
rahul_dahiya 0:fb8047b156bb 1860
rahul_dahiya 0:fb8047b156bb 1861 if( ( ret = ssl_parse_alpn_ext( ssl, ext + 4, ext_size ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 1862 return( ret );
rahul_dahiya 0:fb8047b156bb 1863
rahul_dahiya 0:fb8047b156bb 1864 break;
rahul_dahiya 0:fb8047b156bb 1865 #endif /* MBEDTLS_SSL_ALPN */
rahul_dahiya 0:fb8047b156bb 1866
rahul_dahiya 0:fb8047b156bb 1867 default:
rahul_dahiya 0:fb8047b156bb 1868 MBEDTLS_SSL_DEBUG_MSG( 3, ( "unknown extension found: %d (ignoring)",
rahul_dahiya 0:fb8047b156bb 1869 ext_id ) );
rahul_dahiya 0:fb8047b156bb 1870 }
rahul_dahiya 0:fb8047b156bb 1871
rahul_dahiya 0:fb8047b156bb 1872 ext_len -= 4 + ext_size;
rahul_dahiya 0:fb8047b156bb 1873 ext += 4 + ext_size;
rahul_dahiya 0:fb8047b156bb 1874
rahul_dahiya 0:fb8047b156bb 1875 if( ext_len > 0 && ext_len < 4 )
rahul_dahiya 0:fb8047b156bb 1876 {
rahul_dahiya 0:fb8047b156bb 1877 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello message" ) );
rahul_dahiya 0:fb8047b156bb 1878 return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
rahul_dahiya 0:fb8047b156bb 1879 }
rahul_dahiya 0:fb8047b156bb 1880 }
rahul_dahiya 0:fb8047b156bb 1881
rahul_dahiya 0:fb8047b156bb 1882 /*
rahul_dahiya 0:fb8047b156bb 1883 * Renegotiation security checks
rahul_dahiya 0:fb8047b156bb 1884 */
rahul_dahiya 0:fb8047b156bb 1885 if( ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION &&
rahul_dahiya 0:fb8047b156bb 1886 ssl->conf->allow_legacy_renegotiation == MBEDTLS_SSL_LEGACY_BREAK_HANDSHAKE )
rahul_dahiya 0:fb8047b156bb 1887 {
rahul_dahiya 0:fb8047b156bb 1888 MBEDTLS_SSL_DEBUG_MSG( 1, ( "legacy renegotiation, breaking off handshake" ) );
rahul_dahiya 0:fb8047b156bb 1889 handshake_failure = 1;
rahul_dahiya 0:fb8047b156bb 1890 }
rahul_dahiya 0:fb8047b156bb 1891 #if defined(MBEDTLS_SSL_RENEGOTIATION)
rahul_dahiya 0:fb8047b156bb 1892 else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS &&
rahul_dahiya 0:fb8047b156bb 1893 ssl->secure_renegotiation == MBEDTLS_SSL_SECURE_RENEGOTIATION &&
rahul_dahiya 0:fb8047b156bb 1894 renegotiation_info_seen == 0 )
rahul_dahiya 0:fb8047b156bb 1895 {
rahul_dahiya 0:fb8047b156bb 1896 MBEDTLS_SSL_DEBUG_MSG( 1, ( "renegotiation_info extension missing (secure)" ) );
rahul_dahiya 0:fb8047b156bb 1897 handshake_failure = 1;
rahul_dahiya 0:fb8047b156bb 1898 }
rahul_dahiya 0:fb8047b156bb 1899 else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS &&
rahul_dahiya 0:fb8047b156bb 1900 ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION &&
rahul_dahiya 0:fb8047b156bb 1901 ssl->conf->allow_legacy_renegotiation == MBEDTLS_SSL_LEGACY_NO_RENEGOTIATION )
rahul_dahiya 0:fb8047b156bb 1902 {
rahul_dahiya 0:fb8047b156bb 1903 MBEDTLS_SSL_DEBUG_MSG( 1, ( "legacy renegotiation not allowed" ) );
rahul_dahiya 0:fb8047b156bb 1904 handshake_failure = 1;
rahul_dahiya 0:fb8047b156bb 1905 }
rahul_dahiya 0:fb8047b156bb 1906 else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS &&
rahul_dahiya 0:fb8047b156bb 1907 ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION &&
rahul_dahiya 0:fb8047b156bb 1908 renegotiation_info_seen == 1 )
rahul_dahiya 0:fb8047b156bb 1909 {
rahul_dahiya 0:fb8047b156bb 1910 MBEDTLS_SSL_DEBUG_MSG( 1, ( "renegotiation_info extension present (legacy)" ) );
rahul_dahiya 0:fb8047b156bb 1911 handshake_failure = 1;
rahul_dahiya 0:fb8047b156bb 1912 }
rahul_dahiya 0:fb8047b156bb 1913 #endif /* MBEDTLS_SSL_RENEGOTIATION */
rahul_dahiya 0:fb8047b156bb 1914
rahul_dahiya 0:fb8047b156bb 1915 if( handshake_failure == 1 )
rahul_dahiya 0:fb8047b156bb 1916 {
rahul_dahiya 0:fb8047b156bb 1917 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 1918 MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
rahul_dahiya 0:fb8047b156bb 1919 return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO );
rahul_dahiya 0:fb8047b156bb 1920 }
rahul_dahiya 0:fb8047b156bb 1921
rahul_dahiya 0:fb8047b156bb 1922 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse server hello" ) );
rahul_dahiya 0:fb8047b156bb 1923
rahul_dahiya 0:fb8047b156bb 1924 return( 0 );
rahul_dahiya 0:fb8047b156bb 1925 }
rahul_dahiya 0:fb8047b156bb 1926
rahul_dahiya 0:fb8047b156bb 1927 #if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) || \
rahul_dahiya 0:fb8047b156bb 1928 defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED)
rahul_dahiya 0:fb8047b156bb 1929 static int ssl_parse_server_dh_params( mbedtls_ssl_context *ssl, unsigned char **p,
rahul_dahiya 0:fb8047b156bb 1930 unsigned char *end )
rahul_dahiya 0:fb8047b156bb 1931 {
rahul_dahiya 0:fb8047b156bb 1932 int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
rahul_dahiya 0:fb8047b156bb 1933
rahul_dahiya 0:fb8047b156bb 1934 /*
rahul_dahiya 0:fb8047b156bb 1935 * Ephemeral DH parameters:
rahul_dahiya 0:fb8047b156bb 1936 *
rahul_dahiya 0:fb8047b156bb 1937 * struct {
rahul_dahiya 0:fb8047b156bb 1938 * opaque dh_p<1..2^16-1>;
rahul_dahiya 0:fb8047b156bb 1939 * opaque dh_g<1..2^16-1>;
rahul_dahiya 0:fb8047b156bb 1940 * opaque dh_Ys<1..2^16-1>;
rahul_dahiya 0:fb8047b156bb 1941 * } ServerDHParams;
rahul_dahiya 0:fb8047b156bb 1942 */
rahul_dahiya 0:fb8047b156bb 1943 if( ( ret = mbedtls_dhm_read_params( &ssl->handshake->dhm_ctx, p, end ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 1944 {
rahul_dahiya 0:fb8047b156bb 1945 MBEDTLS_SSL_DEBUG_RET( 2, ( "mbedtls_dhm_read_params" ), ret );
rahul_dahiya 0:fb8047b156bb 1946 return( ret );
rahul_dahiya 0:fb8047b156bb 1947 }
rahul_dahiya 0:fb8047b156bb 1948
rahul_dahiya 0:fb8047b156bb 1949 if( ssl->handshake->dhm_ctx.len * 8 < ssl->conf->dhm_min_bitlen )
rahul_dahiya 0:fb8047b156bb 1950 {
rahul_dahiya 0:fb8047b156bb 1951 MBEDTLS_SSL_DEBUG_MSG( 1, ( "DHM prime too short: %d < %d",
rahul_dahiya 0:fb8047b156bb 1952 ssl->handshake->dhm_ctx.len * 8,
rahul_dahiya 0:fb8047b156bb 1953 ssl->conf->dhm_min_bitlen ) );
rahul_dahiya 0:fb8047b156bb 1954 return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
rahul_dahiya 0:fb8047b156bb 1955 }
rahul_dahiya 0:fb8047b156bb 1956
rahul_dahiya 0:fb8047b156bb 1957 MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: P ", &ssl->handshake->dhm_ctx.P );
rahul_dahiya 0:fb8047b156bb 1958 MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: G ", &ssl->handshake->dhm_ctx.G );
rahul_dahiya 0:fb8047b156bb 1959 MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: GY", &ssl->handshake->dhm_ctx.GY );
rahul_dahiya 0:fb8047b156bb 1960
rahul_dahiya 0:fb8047b156bb 1961 return( ret );
rahul_dahiya 0:fb8047b156bb 1962 }
rahul_dahiya 0:fb8047b156bb 1963 #endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED ||
rahul_dahiya 0:fb8047b156bb 1964 MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */
rahul_dahiya 0:fb8047b156bb 1965
rahul_dahiya 0:fb8047b156bb 1966 #if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \
rahul_dahiya 0:fb8047b156bb 1967 defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) || \
rahul_dahiya 0:fb8047b156bb 1968 defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED) || \
rahul_dahiya 0:fb8047b156bb 1969 defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || \
rahul_dahiya 0:fb8047b156bb 1970 defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)
rahul_dahiya 0:fb8047b156bb 1971 static int ssl_check_server_ecdh_params( const mbedtls_ssl_context *ssl )
rahul_dahiya 0:fb8047b156bb 1972 {
rahul_dahiya 0:fb8047b156bb 1973 const mbedtls_ecp_curve_info *curve_info;
rahul_dahiya 0:fb8047b156bb 1974
rahul_dahiya 0:fb8047b156bb 1975 curve_info = mbedtls_ecp_curve_info_from_grp_id( ssl->handshake->ecdh_ctx.grp.id );
rahul_dahiya 0:fb8047b156bb 1976 if( curve_info == NULL )
rahul_dahiya 0:fb8047b156bb 1977 {
rahul_dahiya 0:fb8047b156bb 1978 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
rahul_dahiya 0:fb8047b156bb 1979 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
rahul_dahiya 0:fb8047b156bb 1980 }
rahul_dahiya 0:fb8047b156bb 1981
rahul_dahiya 0:fb8047b156bb 1982 MBEDTLS_SSL_DEBUG_MSG( 2, ( "ECDH curve: %s", curve_info->name ) );
rahul_dahiya 0:fb8047b156bb 1983
rahul_dahiya 0:fb8047b156bb 1984 #if defined(MBEDTLS_ECP_C)
rahul_dahiya 0:fb8047b156bb 1985 if( mbedtls_ssl_check_curve( ssl, ssl->handshake->ecdh_ctx.grp.id ) != 0 )
rahul_dahiya 0:fb8047b156bb 1986 #else
rahul_dahiya 0:fb8047b156bb 1987 if( ssl->handshake->ecdh_ctx.grp.nbits < 163 ||
rahul_dahiya 0:fb8047b156bb 1988 ssl->handshake->ecdh_ctx.grp.nbits > 521 )
rahul_dahiya 0:fb8047b156bb 1989 #endif
rahul_dahiya 0:fb8047b156bb 1990 return( -1 );
rahul_dahiya 0:fb8047b156bb 1991
rahul_dahiya 0:fb8047b156bb 1992 MBEDTLS_SSL_DEBUG_ECP( 3, "ECDH: Qp", &ssl->handshake->ecdh_ctx.Qp );
rahul_dahiya 0:fb8047b156bb 1993
rahul_dahiya 0:fb8047b156bb 1994 return( 0 );
rahul_dahiya 0:fb8047b156bb 1995 }
rahul_dahiya 0:fb8047b156bb 1996 #endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED ||
rahul_dahiya 0:fb8047b156bb 1997 MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED ||
rahul_dahiya 0:fb8047b156bb 1998 MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED ||
rahul_dahiya 0:fb8047b156bb 1999 MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED ||
rahul_dahiya 0:fb8047b156bb 2000 MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */
rahul_dahiya 0:fb8047b156bb 2001
rahul_dahiya 0:fb8047b156bb 2002 #if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \
rahul_dahiya 0:fb8047b156bb 2003 defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) || \
rahul_dahiya 0:fb8047b156bb 2004 defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
rahul_dahiya 0:fb8047b156bb 2005 static int ssl_parse_server_ecdh_params( mbedtls_ssl_context *ssl,
rahul_dahiya 0:fb8047b156bb 2006 unsigned char **p,
rahul_dahiya 0:fb8047b156bb 2007 unsigned char *end )
rahul_dahiya 0:fb8047b156bb 2008 {
rahul_dahiya 0:fb8047b156bb 2009 int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
rahul_dahiya 0:fb8047b156bb 2010
rahul_dahiya 0:fb8047b156bb 2011 /*
rahul_dahiya 0:fb8047b156bb 2012 * Ephemeral ECDH parameters:
rahul_dahiya 0:fb8047b156bb 2013 *
rahul_dahiya 0:fb8047b156bb 2014 * struct {
rahul_dahiya 0:fb8047b156bb 2015 * ECParameters curve_params;
rahul_dahiya 0:fb8047b156bb 2016 * ECPoint public;
rahul_dahiya 0:fb8047b156bb 2017 * } ServerECDHParams;
rahul_dahiya 0:fb8047b156bb 2018 */
rahul_dahiya 0:fb8047b156bb 2019 if( ( ret = mbedtls_ecdh_read_params( &ssl->handshake->ecdh_ctx,
rahul_dahiya 0:fb8047b156bb 2020 (const unsigned char **) p, end ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 2021 {
rahul_dahiya 0:fb8047b156bb 2022 MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ecdh_read_params" ), ret );
rahul_dahiya 0:fb8047b156bb 2023 return( ret );
rahul_dahiya 0:fb8047b156bb 2024 }
rahul_dahiya 0:fb8047b156bb 2025
rahul_dahiya 0:fb8047b156bb 2026 if( ssl_check_server_ecdh_params( ssl ) != 0 )
rahul_dahiya 0:fb8047b156bb 2027 {
rahul_dahiya 0:fb8047b156bb 2028 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message (ECDHE curve)" ) );
rahul_dahiya 0:fb8047b156bb 2029 return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
rahul_dahiya 0:fb8047b156bb 2030 }
rahul_dahiya 0:fb8047b156bb 2031
rahul_dahiya 0:fb8047b156bb 2032 return( ret );
rahul_dahiya 0:fb8047b156bb 2033 }
rahul_dahiya 0:fb8047b156bb 2034 #endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED ||
rahul_dahiya 0:fb8047b156bb 2035 MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED ||
rahul_dahiya 0:fb8047b156bb 2036 MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */
rahul_dahiya 0:fb8047b156bb 2037
rahul_dahiya 0:fb8047b156bb 2038 #if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
rahul_dahiya 0:fb8047b156bb 2039 static int ssl_parse_server_psk_hint( mbedtls_ssl_context *ssl,
rahul_dahiya 0:fb8047b156bb 2040 unsigned char **p,
rahul_dahiya 0:fb8047b156bb 2041 unsigned char *end )
rahul_dahiya 0:fb8047b156bb 2042 {
rahul_dahiya 0:fb8047b156bb 2043 int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
rahul_dahiya 0:fb8047b156bb 2044 size_t len;
rahul_dahiya 0:fb8047b156bb 2045 ((void) ssl);
rahul_dahiya 0:fb8047b156bb 2046
rahul_dahiya 0:fb8047b156bb 2047 /*
rahul_dahiya 0:fb8047b156bb 2048 * PSK parameters:
rahul_dahiya 0:fb8047b156bb 2049 *
rahul_dahiya 0:fb8047b156bb 2050 * opaque psk_identity_hint<0..2^16-1>;
rahul_dahiya 0:fb8047b156bb 2051 */
rahul_dahiya 0:fb8047b156bb 2052 len = (*p)[0] << 8 | (*p)[1];
rahul_dahiya 0:fb8047b156bb 2053 *p += 2;
rahul_dahiya 0:fb8047b156bb 2054
rahul_dahiya 0:fb8047b156bb 2055 if( (*p) + len > end )
rahul_dahiya 0:fb8047b156bb 2056 {
rahul_dahiya 0:fb8047b156bb 2057 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message "
rahul_dahiya 0:fb8047b156bb 2058 "(psk_identity_hint length)" ) );
rahul_dahiya 0:fb8047b156bb 2059 return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
rahul_dahiya 0:fb8047b156bb 2060 }
rahul_dahiya 0:fb8047b156bb 2061
rahul_dahiya 0:fb8047b156bb 2062 /*
rahul_dahiya 0:fb8047b156bb 2063 * Note: we currently ignore the PKS identity hint, as we only allow one
rahul_dahiya 0:fb8047b156bb 2064 * PSK to be provisionned on the client. This could be changed later if
rahul_dahiya 0:fb8047b156bb 2065 * someone needs that feature.
rahul_dahiya 0:fb8047b156bb 2066 */
rahul_dahiya 0:fb8047b156bb 2067 *p += len;
rahul_dahiya 0:fb8047b156bb 2068 ret = 0;
rahul_dahiya 0:fb8047b156bb 2069
rahul_dahiya 0:fb8047b156bb 2070 return( ret );
rahul_dahiya 0:fb8047b156bb 2071 }
rahul_dahiya 0:fb8047b156bb 2072 #endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */
rahul_dahiya 0:fb8047b156bb 2073
rahul_dahiya 0:fb8047b156bb 2074 #if defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) || \
rahul_dahiya 0:fb8047b156bb 2075 defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED)
rahul_dahiya 0:fb8047b156bb 2076 /*
rahul_dahiya 0:fb8047b156bb 2077 * Generate a pre-master secret and encrypt it with the server's RSA key
rahul_dahiya 0:fb8047b156bb 2078 */
rahul_dahiya 0:fb8047b156bb 2079 static int ssl_write_encrypted_pms( mbedtls_ssl_context *ssl,
rahul_dahiya 0:fb8047b156bb 2080 size_t offset, size_t *olen,
rahul_dahiya 0:fb8047b156bb 2081 size_t pms_offset )
rahul_dahiya 0:fb8047b156bb 2082 {
rahul_dahiya 0:fb8047b156bb 2083 int ret;
rahul_dahiya 0:fb8047b156bb 2084 size_t len_bytes = ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ? 0 : 2;
rahul_dahiya 0:fb8047b156bb 2085 unsigned char *p = ssl->handshake->premaster + pms_offset;
rahul_dahiya 0:fb8047b156bb 2086
rahul_dahiya 0:fb8047b156bb 2087 if( offset + len_bytes > MBEDTLS_SSL_MAX_CONTENT_LEN )
rahul_dahiya 0:fb8047b156bb 2088 {
rahul_dahiya 0:fb8047b156bb 2089 MBEDTLS_SSL_DEBUG_MSG( 1, ( "buffer too small for encrypted pms" ) );
rahul_dahiya 0:fb8047b156bb 2090 return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
rahul_dahiya 0:fb8047b156bb 2091 }
rahul_dahiya 0:fb8047b156bb 2092
rahul_dahiya 0:fb8047b156bb 2093 /*
rahul_dahiya 0:fb8047b156bb 2094 * Generate (part of) the pre-master as
rahul_dahiya 0:fb8047b156bb 2095 * struct {
rahul_dahiya 0:fb8047b156bb 2096 * ProtocolVersion client_version;
rahul_dahiya 0:fb8047b156bb 2097 * opaque random[46];
rahul_dahiya 0:fb8047b156bb 2098 * } PreMasterSecret;
rahul_dahiya 0:fb8047b156bb 2099 */
rahul_dahiya 0:fb8047b156bb 2100 mbedtls_ssl_write_version( ssl->conf->max_major_ver, ssl->conf->max_minor_ver,
rahul_dahiya 0:fb8047b156bb 2101 ssl->conf->transport, p );
rahul_dahiya 0:fb8047b156bb 2102
rahul_dahiya 0:fb8047b156bb 2103 if( ( ret = ssl->conf->f_rng( ssl->conf->p_rng, p + 2, 46 ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 2104 {
rahul_dahiya 0:fb8047b156bb 2105 MBEDTLS_SSL_DEBUG_RET( 1, "f_rng", ret );
rahul_dahiya 0:fb8047b156bb 2106 return( ret );
rahul_dahiya 0:fb8047b156bb 2107 }
rahul_dahiya 0:fb8047b156bb 2108
rahul_dahiya 0:fb8047b156bb 2109 ssl->handshake->pmslen = 48;
rahul_dahiya 0:fb8047b156bb 2110
rahul_dahiya 0:fb8047b156bb 2111 if( ssl->session_negotiate->peer_cert == NULL )
rahul_dahiya 0:fb8047b156bb 2112 {
rahul_dahiya 0:fb8047b156bb 2113 MBEDTLS_SSL_DEBUG_MSG( 2, ( "certificate required" ) );
rahul_dahiya 0:fb8047b156bb 2114 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
rahul_dahiya 0:fb8047b156bb 2115 }
rahul_dahiya 0:fb8047b156bb 2116
rahul_dahiya 0:fb8047b156bb 2117 /*
rahul_dahiya 0:fb8047b156bb 2118 * Now write it out, encrypted
rahul_dahiya 0:fb8047b156bb 2119 */
rahul_dahiya 0:fb8047b156bb 2120 if( ! mbedtls_pk_can_do( &ssl->session_negotiate->peer_cert->pk,
rahul_dahiya 0:fb8047b156bb 2121 MBEDTLS_PK_RSA ) )
rahul_dahiya 0:fb8047b156bb 2122 {
rahul_dahiya 0:fb8047b156bb 2123 MBEDTLS_SSL_DEBUG_MSG( 1, ( "certificate key type mismatch" ) );
rahul_dahiya 0:fb8047b156bb 2124 return( MBEDTLS_ERR_SSL_PK_TYPE_MISMATCH );
rahul_dahiya 0:fb8047b156bb 2125 }
rahul_dahiya 0:fb8047b156bb 2126
rahul_dahiya 0:fb8047b156bb 2127 if( ( ret = mbedtls_pk_encrypt( &ssl->session_negotiate->peer_cert->pk,
rahul_dahiya 0:fb8047b156bb 2128 p, ssl->handshake->pmslen,
rahul_dahiya 0:fb8047b156bb 2129 ssl->out_msg + offset + len_bytes, olen,
rahul_dahiya 0:fb8047b156bb 2130 MBEDTLS_SSL_MAX_CONTENT_LEN - offset - len_bytes,
rahul_dahiya 0:fb8047b156bb 2131 ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 2132 {
rahul_dahiya 0:fb8047b156bb 2133 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_rsa_pkcs1_encrypt", ret );
rahul_dahiya 0:fb8047b156bb 2134 return( ret );
rahul_dahiya 0:fb8047b156bb 2135 }
rahul_dahiya 0:fb8047b156bb 2136
rahul_dahiya 0:fb8047b156bb 2137 #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
rahul_dahiya 0:fb8047b156bb 2138 defined(MBEDTLS_SSL_PROTO_TLS1_2)
rahul_dahiya 0:fb8047b156bb 2139 if( len_bytes == 2 )
rahul_dahiya 0:fb8047b156bb 2140 {
rahul_dahiya 0:fb8047b156bb 2141 ssl->out_msg[offset+0] = (unsigned char)( *olen >> 8 );
rahul_dahiya 0:fb8047b156bb 2142 ssl->out_msg[offset+1] = (unsigned char)( *olen );
rahul_dahiya 0:fb8047b156bb 2143 *olen += 2;
rahul_dahiya 0:fb8047b156bb 2144 }
rahul_dahiya 0:fb8047b156bb 2145 #endif
rahul_dahiya 0:fb8047b156bb 2146
rahul_dahiya 0:fb8047b156bb 2147 return( 0 );
rahul_dahiya 0:fb8047b156bb 2148 }
rahul_dahiya 0:fb8047b156bb 2149 #endif /* MBEDTLS_KEY_EXCHANGE_RSA_ENABLED ||
rahul_dahiya 0:fb8047b156bb 2150 MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */
rahul_dahiya 0:fb8047b156bb 2151
rahul_dahiya 0:fb8047b156bb 2152 #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
rahul_dahiya 0:fb8047b156bb 2153 #if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) || \
rahul_dahiya 0:fb8047b156bb 2154 defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \
rahul_dahiya 0:fb8047b156bb 2155 defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED)
rahul_dahiya 0:fb8047b156bb 2156 static int ssl_parse_signature_algorithm( mbedtls_ssl_context *ssl,
rahul_dahiya 0:fb8047b156bb 2157 unsigned char **p,
rahul_dahiya 0:fb8047b156bb 2158 unsigned char *end,
rahul_dahiya 0:fb8047b156bb 2159 mbedtls_md_type_t *md_alg,
rahul_dahiya 0:fb8047b156bb 2160 mbedtls_pk_type_t *pk_alg )
rahul_dahiya 0:fb8047b156bb 2161 {
rahul_dahiya 0:fb8047b156bb 2162 ((void) ssl);
rahul_dahiya 0:fb8047b156bb 2163 *md_alg = MBEDTLS_MD_NONE;
rahul_dahiya 0:fb8047b156bb 2164 *pk_alg = MBEDTLS_PK_NONE;
rahul_dahiya 0:fb8047b156bb 2165
rahul_dahiya 0:fb8047b156bb 2166 /* Only in TLS 1.2 */
rahul_dahiya 0:fb8047b156bb 2167 if( ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_3 )
rahul_dahiya 0:fb8047b156bb 2168 {
rahul_dahiya 0:fb8047b156bb 2169 return( 0 );
rahul_dahiya 0:fb8047b156bb 2170 }
rahul_dahiya 0:fb8047b156bb 2171
rahul_dahiya 0:fb8047b156bb 2172 if( (*p) + 2 > end )
rahul_dahiya 0:fb8047b156bb 2173 return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
rahul_dahiya 0:fb8047b156bb 2174
rahul_dahiya 0:fb8047b156bb 2175 /*
rahul_dahiya 0:fb8047b156bb 2176 * Get hash algorithm
rahul_dahiya 0:fb8047b156bb 2177 */
rahul_dahiya 0:fb8047b156bb 2178 if( ( *md_alg = mbedtls_ssl_md_alg_from_hash( (*p)[0] ) ) == MBEDTLS_MD_NONE )
rahul_dahiya 0:fb8047b156bb 2179 {
rahul_dahiya 0:fb8047b156bb 2180 MBEDTLS_SSL_DEBUG_MSG( 1, ( "Server used unsupported "
rahul_dahiya 0:fb8047b156bb 2181 "HashAlgorithm %d", *(p)[0] ) );
rahul_dahiya 0:fb8047b156bb 2182 return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
rahul_dahiya 0:fb8047b156bb 2183 }
rahul_dahiya 0:fb8047b156bb 2184
rahul_dahiya 0:fb8047b156bb 2185 /*
rahul_dahiya 0:fb8047b156bb 2186 * Get signature algorithm
rahul_dahiya 0:fb8047b156bb 2187 */
rahul_dahiya 0:fb8047b156bb 2188 if( ( *pk_alg = mbedtls_ssl_pk_alg_from_sig( (*p)[1] ) ) == MBEDTLS_PK_NONE )
rahul_dahiya 0:fb8047b156bb 2189 {
rahul_dahiya 0:fb8047b156bb 2190 MBEDTLS_SSL_DEBUG_MSG( 1, ( "server used unsupported "
rahul_dahiya 0:fb8047b156bb 2191 "SignatureAlgorithm %d", (*p)[1] ) );
rahul_dahiya 0:fb8047b156bb 2192 return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
rahul_dahiya 0:fb8047b156bb 2193 }
rahul_dahiya 0:fb8047b156bb 2194
rahul_dahiya 0:fb8047b156bb 2195 /*
rahul_dahiya 0:fb8047b156bb 2196 * Check if the hash is acceptable
rahul_dahiya 0:fb8047b156bb 2197 */
rahul_dahiya 0:fb8047b156bb 2198 if( mbedtls_ssl_check_sig_hash( ssl, *md_alg ) != 0 )
rahul_dahiya 0:fb8047b156bb 2199 {
rahul_dahiya 0:fb8047b156bb 2200 MBEDTLS_SSL_DEBUG_MSG( 1, ( "server used HashAlgorithm %d that was not offered",
rahul_dahiya 0:fb8047b156bb 2201 *(p)[0] ) );
rahul_dahiya 0:fb8047b156bb 2202 return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
rahul_dahiya 0:fb8047b156bb 2203 }
rahul_dahiya 0:fb8047b156bb 2204
rahul_dahiya 0:fb8047b156bb 2205 MBEDTLS_SSL_DEBUG_MSG( 2, ( "Server used SignatureAlgorithm %d", (*p)[1] ) );
rahul_dahiya 0:fb8047b156bb 2206 MBEDTLS_SSL_DEBUG_MSG( 2, ( "Server used HashAlgorithm %d", (*p)[0] ) );
rahul_dahiya 0:fb8047b156bb 2207 *p += 2;
rahul_dahiya 0:fb8047b156bb 2208
rahul_dahiya 0:fb8047b156bb 2209 return( 0 );
rahul_dahiya 0:fb8047b156bb 2210 }
rahul_dahiya 0:fb8047b156bb 2211 #endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED ||
rahul_dahiya 0:fb8047b156bb 2212 MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED ||
rahul_dahiya 0:fb8047b156bb 2213 MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED */
rahul_dahiya 0:fb8047b156bb 2214 #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
rahul_dahiya 0:fb8047b156bb 2215
rahul_dahiya 0:fb8047b156bb 2216 #if defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || \
rahul_dahiya 0:fb8047b156bb 2217 defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)
rahul_dahiya 0:fb8047b156bb 2218 static int ssl_get_ecdh_params_from_cert( mbedtls_ssl_context *ssl )
rahul_dahiya 0:fb8047b156bb 2219 {
rahul_dahiya 0:fb8047b156bb 2220 int ret;
rahul_dahiya 0:fb8047b156bb 2221 const mbedtls_ecp_keypair *peer_key;
rahul_dahiya 0:fb8047b156bb 2222
rahul_dahiya 0:fb8047b156bb 2223 if( ssl->session_negotiate->peer_cert == NULL )
rahul_dahiya 0:fb8047b156bb 2224 {
rahul_dahiya 0:fb8047b156bb 2225 MBEDTLS_SSL_DEBUG_MSG( 2, ( "certificate required" ) );
rahul_dahiya 0:fb8047b156bb 2226 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
rahul_dahiya 0:fb8047b156bb 2227 }
rahul_dahiya 0:fb8047b156bb 2228
rahul_dahiya 0:fb8047b156bb 2229 if( ! mbedtls_pk_can_do( &ssl->session_negotiate->peer_cert->pk,
rahul_dahiya 0:fb8047b156bb 2230 MBEDTLS_PK_ECKEY ) )
rahul_dahiya 0:fb8047b156bb 2231 {
rahul_dahiya 0:fb8047b156bb 2232 MBEDTLS_SSL_DEBUG_MSG( 1, ( "server key not ECDH capable" ) );
rahul_dahiya 0:fb8047b156bb 2233 return( MBEDTLS_ERR_SSL_PK_TYPE_MISMATCH );
rahul_dahiya 0:fb8047b156bb 2234 }
rahul_dahiya 0:fb8047b156bb 2235
rahul_dahiya 0:fb8047b156bb 2236 peer_key = mbedtls_pk_ec( ssl->session_negotiate->peer_cert->pk );
rahul_dahiya 0:fb8047b156bb 2237
rahul_dahiya 0:fb8047b156bb 2238 if( ( ret = mbedtls_ecdh_get_params( &ssl->handshake->ecdh_ctx, peer_key,
rahul_dahiya 0:fb8047b156bb 2239 MBEDTLS_ECDH_THEIRS ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 2240 {
rahul_dahiya 0:fb8047b156bb 2241 MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ecdh_get_params" ), ret );
rahul_dahiya 0:fb8047b156bb 2242 return( ret );
rahul_dahiya 0:fb8047b156bb 2243 }
rahul_dahiya 0:fb8047b156bb 2244
rahul_dahiya 0:fb8047b156bb 2245 if( ssl_check_server_ecdh_params( ssl ) != 0 )
rahul_dahiya 0:fb8047b156bb 2246 {
rahul_dahiya 0:fb8047b156bb 2247 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server certificate (ECDH curve)" ) );
rahul_dahiya 0:fb8047b156bb 2248 return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
rahul_dahiya 0:fb8047b156bb 2249 }
rahul_dahiya 0:fb8047b156bb 2250
rahul_dahiya 0:fb8047b156bb 2251 return( ret );
rahul_dahiya 0:fb8047b156bb 2252 }
rahul_dahiya 0:fb8047b156bb 2253 #endif /* MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) ||
rahul_dahiya 0:fb8047b156bb 2254 MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */
rahul_dahiya 0:fb8047b156bb 2255
rahul_dahiya 0:fb8047b156bb 2256 static int ssl_parse_server_key_exchange( mbedtls_ssl_context *ssl )
rahul_dahiya 0:fb8047b156bb 2257 {
rahul_dahiya 0:fb8047b156bb 2258 int ret;
rahul_dahiya 0:fb8047b156bb 2259 const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
rahul_dahiya 0:fb8047b156bb 2260 ssl->transform_negotiate->ciphersuite_info;
rahul_dahiya 0:fb8047b156bb 2261 unsigned char *p, *end;
rahul_dahiya 0:fb8047b156bb 2262
rahul_dahiya 0:fb8047b156bb 2263 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse server key exchange" ) );
rahul_dahiya 0:fb8047b156bb 2264
rahul_dahiya 0:fb8047b156bb 2265 #if defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED)
rahul_dahiya 0:fb8047b156bb 2266 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA )
rahul_dahiya 0:fb8047b156bb 2267 {
rahul_dahiya 0:fb8047b156bb 2268 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse server key exchange" ) );
rahul_dahiya 0:fb8047b156bb 2269 ssl->state++;
rahul_dahiya 0:fb8047b156bb 2270 return( 0 );
rahul_dahiya 0:fb8047b156bb 2271 }
rahul_dahiya 0:fb8047b156bb 2272 ((void) p);
rahul_dahiya 0:fb8047b156bb 2273 ((void) end);
rahul_dahiya 0:fb8047b156bb 2274 #endif
rahul_dahiya 0:fb8047b156bb 2275
rahul_dahiya 0:fb8047b156bb 2276 #if defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || \
rahul_dahiya 0:fb8047b156bb 2277 defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)
rahul_dahiya 0:fb8047b156bb 2278 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_RSA ||
rahul_dahiya 0:fb8047b156bb 2279 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA )
rahul_dahiya 0:fb8047b156bb 2280 {
rahul_dahiya 0:fb8047b156bb 2281 if( ( ret = ssl_get_ecdh_params_from_cert( ssl ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 2282 {
rahul_dahiya 0:fb8047b156bb 2283 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_get_ecdh_params_from_cert", ret );
rahul_dahiya 0:fb8047b156bb 2284 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 2285 MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
rahul_dahiya 0:fb8047b156bb 2286 return( ret );
rahul_dahiya 0:fb8047b156bb 2287 }
rahul_dahiya 0:fb8047b156bb 2288
rahul_dahiya 0:fb8047b156bb 2289 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse server key exchange" ) );
rahul_dahiya 0:fb8047b156bb 2290 ssl->state++;
rahul_dahiya 0:fb8047b156bb 2291 return( 0 );
rahul_dahiya 0:fb8047b156bb 2292 }
rahul_dahiya 0:fb8047b156bb 2293 ((void) p);
rahul_dahiya 0:fb8047b156bb 2294 ((void) end);
rahul_dahiya 0:fb8047b156bb 2295 #endif /* MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED ||
rahul_dahiya 0:fb8047b156bb 2296 MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */
rahul_dahiya 0:fb8047b156bb 2297
rahul_dahiya 0:fb8047b156bb 2298 if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 2299 {
rahul_dahiya 0:fb8047b156bb 2300 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
rahul_dahiya 0:fb8047b156bb 2301 return( ret );
rahul_dahiya 0:fb8047b156bb 2302 }
rahul_dahiya 0:fb8047b156bb 2303
rahul_dahiya 0:fb8047b156bb 2304 if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE )
rahul_dahiya 0:fb8047b156bb 2305 {
rahul_dahiya 0:fb8047b156bb 2306 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
rahul_dahiya 0:fb8047b156bb 2307 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 2308 MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE );
rahul_dahiya 0:fb8047b156bb 2309 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
rahul_dahiya 0:fb8047b156bb 2310 }
rahul_dahiya 0:fb8047b156bb 2311
rahul_dahiya 0:fb8047b156bb 2312 /*
rahul_dahiya 0:fb8047b156bb 2313 * ServerKeyExchange may be skipped with PSK and RSA-PSK when the server
rahul_dahiya 0:fb8047b156bb 2314 * doesn't use a psk_identity_hint
rahul_dahiya 0:fb8047b156bb 2315 */
rahul_dahiya 0:fb8047b156bb 2316 if( ssl->in_msg[0] != MBEDTLS_SSL_HS_SERVER_KEY_EXCHANGE )
rahul_dahiya 0:fb8047b156bb 2317 {
rahul_dahiya 0:fb8047b156bb 2318 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK ||
rahul_dahiya 0:fb8047b156bb 2319 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK )
rahul_dahiya 0:fb8047b156bb 2320 {
rahul_dahiya 0:fb8047b156bb 2321 /* Current message is probably either
rahul_dahiya 0:fb8047b156bb 2322 * CertificateRequest or ServerHelloDone */
rahul_dahiya 0:fb8047b156bb 2323 ssl->keep_current_message = 1;
rahul_dahiya 0:fb8047b156bb 2324 goto exit;
rahul_dahiya 0:fb8047b156bb 2325 }
rahul_dahiya 0:fb8047b156bb 2326
rahul_dahiya 0:fb8047b156bb 2327 MBEDTLS_SSL_DEBUG_MSG( 1, ( "server key exchange message must "
rahul_dahiya 0:fb8047b156bb 2328 "not be skipped" ) );
rahul_dahiya 0:fb8047b156bb 2329 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 2330 MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE );
rahul_dahiya 0:fb8047b156bb 2331
rahul_dahiya 0:fb8047b156bb 2332 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
rahul_dahiya 0:fb8047b156bb 2333 }
rahul_dahiya 0:fb8047b156bb 2334
rahul_dahiya 0:fb8047b156bb 2335 p = ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl );
rahul_dahiya 0:fb8047b156bb 2336 end = ssl->in_msg + ssl->in_hslen;
rahul_dahiya 0:fb8047b156bb 2337 MBEDTLS_SSL_DEBUG_BUF( 3, "server key exchange", p, end - p );
rahul_dahiya 0:fb8047b156bb 2338
rahul_dahiya 0:fb8047b156bb 2339 #if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
rahul_dahiya 0:fb8047b156bb 2340 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK ||
rahul_dahiya 0:fb8047b156bb 2341 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK ||
rahul_dahiya 0:fb8047b156bb 2342 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK ||
rahul_dahiya 0:fb8047b156bb 2343 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK )
rahul_dahiya 0:fb8047b156bb 2344 {
rahul_dahiya 0:fb8047b156bb 2345 if( ssl_parse_server_psk_hint( ssl, &p, end ) != 0 )
rahul_dahiya 0:fb8047b156bb 2346 {
rahul_dahiya 0:fb8047b156bb 2347 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
rahul_dahiya 0:fb8047b156bb 2348 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 2349 MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
rahul_dahiya 0:fb8047b156bb 2350 return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
rahul_dahiya 0:fb8047b156bb 2351 }
rahul_dahiya 0:fb8047b156bb 2352 } /* FALLTROUGH */
rahul_dahiya 0:fb8047b156bb 2353 #endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */
rahul_dahiya 0:fb8047b156bb 2354
rahul_dahiya 0:fb8047b156bb 2355 #if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED) || \
rahul_dahiya 0:fb8047b156bb 2356 defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED)
rahul_dahiya 0:fb8047b156bb 2357 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK ||
rahul_dahiya 0:fb8047b156bb 2358 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK )
rahul_dahiya 0:fb8047b156bb 2359 ; /* nothing more to do */
rahul_dahiya 0:fb8047b156bb 2360 else
rahul_dahiya 0:fb8047b156bb 2361 #endif /* MBEDTLS_KEY_EXCHANGE_PSK_ENABLED ||
rahul_dahiya 0:fb8047b156bb 2362 MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */
rahul_dahiya 0:fb8047b156bb 2363 #if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) || \
rahul_dahiya 0:fb8047b156bb 2364 defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED)
rahul_dahiya 0:fb8047b156bb 2365 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_RSA ||
rahul_dahiya 0:fb8047b156bb 2366 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK )
rahul_dahiya 0:fb8047b156bb 2367 {
rahul_dahiya 0:fb8047b156bb 2368 if( ssl_parse_server_dh_params( ssl, &p, end ) != 0 )
rahul_dahiya 0:fb8047b156bb 2369 {
rahul_dahiya 0:fb8047b156bb 2370 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
rahul_dahiya 0:fb8047b156bb 2371 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 2372 MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
rahul_dahiya 0:fb8047b156bb 2373 return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
rahul_dahiya 0:fb8047b156bb 2374 }
rahul_dahiya 0:fb8047b156bb 2375 }
rahul_dahiya 0:fb8047b156bb 2376 else
rahul_dahiya 0:fb8047b156bb 2377 #endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED ||
rahul_dahiya 0:fb8047b156bb 2378 MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */
rahul_dahiya 0:fb8047b156bb 2379 #if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \
rahul_dahiya 0:fb8047b156bb 2380 defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED) || \
rahul_dahiya 0:fb8047b156bb 2381 defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED)
rahul_dahiya 0:fb8047b156bb 2382 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_RSA ||
rahul_dahiya 0:fb8047b156bb 2383 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK ||
rahul_dahiya 0:fb8047b156bb 2384 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA )
rahul_dahiya 0:fb8047b156bb 2385 {
rahul_dahiya 0:fb8047b156bb 2386 if( ssl_parse_server_ecdh_params( ssl, &p, end ) != 0 )
rahul_dahiya 0:fb8047b156bb 2387 {
rahul_dahiya 0:fb8047b156bb 2388 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
rahul_dahiya 0:fb8047b156bb 2389 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 2390 MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
rahul_dahiya 0:fb8047b156bb 2391 return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
rahul_dahiya 0:fb8047b156bb 2392 }
rahul_dahiya 0:fb8047b156bb 2393 }
rahul_dahiya 0:fb8047b156bb 2394 else
rahul_dahiya 0:fb8047b156bb 2395 #endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED ||
rahul_dahiya 0:fb8047b156bb 2396 MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED ||
rahul_dahiya 0:fb8047b156bb 2397 MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED */
rahul_dahiya 0:fb8047b156bb 2398 #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
rahul_dahiya 0:fb8047b156bb 2399 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
rahul_dahiya 0:fb8047b156bb 2400 {
rahul_dahiya 0:fb8047b156bb 2401 ret = mbedtls_ecjpake_read_round_two( &ssl->handshake->ecjpake_ctx,
rahul_dahiya 0:fb8047b156bb 2402 p, end - p );
rahul_dahiya 0:fb8047b156bb 2403 if( ret != 0 )
rahul_dahiya 0:fb8047b156bb 2404 {
rahul_dahiya 0:fb8047b156bb 2405 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_read_round_two", ret );
rahul_dahiya 0:fb8047b156bb 2406 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 2407 MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
rahul_dahiya 0:fb8047b156bb 2408 return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
rahul_dahiya 0:fb8047b156bb 2409 }
rahul_dahiya 0:fb8047b156bb 2410 }
rahul_dahiya 0:fb8047b156bb 2411 else
rahul_dahiya 0:fb8047b156bb 2412 #endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
rahul_dahiya 0:fb8047b156bb 2413 {
rahul_dahiya 0:fb8047b156bb 2414 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
rahul_dahiya 0:fb8047b156bb 2415 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
rahul_dahiya 0:fb8047b156bb 2416 }
rahul_dahiya 0:fb8047b156bb 2417
rahul_dahiya 0:fb8047b156bb 2418 #if defined(MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED)
rahul_dahiya 0:fb8047b156bb 2419 if( mbedtls_ssl_ciphersuite_uses_server_signature( ciphersuite_info ) )
rahul_dahiya 0:fb8047b156bb 2420 {
rahul_dahiya 0:fb8047b156bb 2421 size_t sig_len, hashlen;
rahul_dahiya 0:fb8047b156bb 2422 unsigned char hash[64];
rahul_dahiya 0:fb8047b156bb 2423 mbedtls_md_type_t md_alg = MBEDTLS_MD_NONE;
rahul_dahiya 0:fb8047b156bb 2424 mbedtls_pk_type_t pk_alg = MBEDTLS_PK_NONE;
rahul_dahiya 0:fb8047b156bb 2425 unsigned char *params = ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl );
rahul_dahiya 0:fb8047b156bb 2426 size_t params_len = p - params;
rahul_dahiya 0:fb8047b156bb 2427
rahul_dahiya 0:fb8047b156bb 2428 /*
rahul_dahiya 0:fb8047b156bb 2429 * Handle the digitally-signed structure
rahul_dahiya 0:fb8047b156bb 2430 */
rahul_dahiya 0:fb8047b156bb 2431 #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
rahul_dahiya 0:fb8047b156bb 2432 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
rahul_dahiya 0:fb8047b156bb 2433 {
rahul_dahiya 0:fb8047b156bb 2434 if( ssl_parse_signature_algorithm( ssl, &p, end,
rahul_dahiya 0:fb8047b156bb 2435 &md_alg, &pk_alg ) != 0 )
rahul_dahiya 0:fb8047b156bb 2436 {
rahul_dahiya 0:fb8047b156bb 2437 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
rahul_dahiya 0:fb8047b156bb 2438 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 2439 MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
rahul_dahiya 0:fb8047b156bb 2440 return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
rahul_dahiya 0:fb8047b156bb 2441 }
rahul_dahiya 0:fb8047b156bb 2442
rahul_dahiya 0:fb8047b156bb 2443 if( pk_alg != mbedtls_ssl_get_ciphersuite_sig_pk_alg( ciphersuite_info ) )
rahul_dahiya 0:fb8047b156bb 2444 {
rahul_dahiya 0:fb8047b156bb 2445 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
rahul_dahiya 0:fb8047b156bb 2446 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 2447 MBEDTLS_SSL_ALERT_MSG_ILLEGAL_PARAMETER );
rahul_dahiya 0:fb8047b156bb 2448 return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
rahul_dahiya 0:fb8047b156bb 2449 }
rahul_dahiya 0:fb8047b156bb 2450 }
rahul_dahiya 0:fb8047b156bb 2451 else
rahul_dahiya 0:fb8047b156bb 2452 #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
rahul_dahiya 0:fb8047b156bb 2453 #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
rahul_dahiya 0:fb8047b156bb 2454 defined(MBEDTLS_SSL_PROTO_TLS1_1)
rahul_dahiya 0:fb8047b156bb 2455 if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_3 )
rahul_dahiya 0:fb8047b156bb 2456 {
rahul_dahiya 0:fb8047b156bb 2457 pk_alg = mbedtls_ssl_get_ciphersuite_sig_pk_alg( ciphersuite_info );
rahul_dahiya 0:fb8047b156bb 2458
rahul_dahiya 0:fb8047b156bb 2459 /* Default hash for ECDSA is SHA-1 */
rahul_dahiya 0:fb8047b156bb 2460 if( pk_alg == MBEDTLS_PK_ECDSA && md_alg == MBEDTLS_MD_NONE )
rahul_dahiya 0:fb8047b156bb 2461 md_alg = MBEDTLS_MD_SHA1;
rahul_dahiya 0:fb8047b156bb 2462 }
rahul_dahiya 0:fb8047b156bb 2463 else
rahul_dahiya 0:fb8047b156bb 2464 #endif
rahul_dahiya 0:fb8047b156bb 2465 {
rahul_dahiya 0:fb8047b156bb 2466 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
rahul_dahiya 0:fb8047b156bb 2467 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
rahul_dahiya 0:fb8047b156bb 2468 }
rahul_dahiya 0:fb8047b156bb 2469
rahul_dahiya 0:fb8047b156bb 2470 /*
rahul_dahiya 0:fb8047b156bb 2471 * Read signature
rahul_dahiya 0:fb8047b156bb 2472 */
rahul_dahiya 0:fb8047b156bb 2473 sig_len = ( p[0] << 8 ) | p[1];
rahul_dahiya 0:fb8047b156bb 2474 p += 2;
rahul_dahiya 0:fb8047b156bb 2475
rahul_dahiya 0:fb8047b156bb 2476 if( end != p + sig_len )
rahul_dahiya 0:fb8047b156bb 2477 {
rahul_dahiya 0:fb8047b156bb 2478 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
rahul_dahiya 0:fb8047b156bb 2479 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 2480 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
rahul_dahiya 0:fb8047b156bb 2481 return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_KEY_EXCHANGE );
rahul_dahiya 0:fb8047b156bb 2482 }
rahul_dahiya 0:fb8047b156bb 2483
rahul_dahiya 0:fb8047b156bb 2484 MBEDTLS_SSL_DEBUG_BUF( 3, "signature", p, sig_len );
rahul_dahiya 0:fb8047b156bb 2485
rahul_dahiya 0:fb8047b156bb 2486 /*
rahul_dahiya 0:fb8047b156bb 2487 * Compute the hash that has been signed
rahul_dahiya 0:fb8047b156bb 2488 */
rahul_dahiya 0:fb8047b156bb 2489 #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
rahul_dahiya 0:fb8047b156bb 2490 defined(MBEDTLS_SSL_PROTO_TLS1_1)
rahul_dahiya 0:fb8047b156bb 2491 if( md_alg == MBEDTLS_MD_NONE )
rahul_dahiya 0:fb8047b156bb 2492 {
rahul_dahiya 0:fb8047b156bb 2493 mbedtls_md5_context mbedtls_md5;
rahul_dahiya 0:fb8047b156bb 2494 mbedtls_sha1_context mbedtls_sha1;
rahul_dahiya 0:fb8047b156bb 2495
rahul_dahiya 0:fb8047b156bb 2496 mbedtls_md5_init( &mbedtls_md5 );
rahul_dahiya 0:fb8047b156bb 2497 mbedtls_sha1_init( &mbedtls_sha1 );
rahul_dahiya 0:fb8047b156bb 2498
rahul_dahiya 0:fb8047b156bb 2499 hashlen = 36;
rahul_dahiya 0:fb8047b156bb 2500
rahul_dahiya 0:fb8047b156bb 2501 /*
rahul_dahiya 0:fb8047b156bb 2502 * digitally-signed struct {
rahul_dahiya 0:fb8047b156bb 2503 * opaque md5_hash[16];
rahul_dahiya 0:fb8047b156bb 2504 * opaque sha_hash[20];
rahul_dahiya 0:fb8047b156bb 2505 * };
rahul_dahiya 0:fb8047b156bb 2506 *
rahul_dahiya 0:fb8047b156bb 2507 * md5_hash
rahul_dahiya 0:fb8047b156bb 2508 * MD5(ClientHello.random + ServerHello.random
rahul_dahiya 0:fb8047b156bb 2509 * + ServerParams);
rahul_dahiya 0:fb8047b156bb 2510 * sha_hash
rahul_dahiya 0:fb8047b156bb 2511 * SHA(ClientHello.random + ServerHello.random
rahul_dahiya 0:fb8047b156bb 2512 * + ServerParams);
rahul_dahiya 0:fb8047b156bb 2513 */
rahul_dahiya 0:fb8047b156bb 2514 mbedtls_md5_starts( &mbedtls_md5 );
rahul_dahiya 0:fb8047b156bb 2515 mbedtls_md5_update( &mbedtls_md5, ssl->handshake->randbytes, 64 );
rahul_dahiya 0:fb8047b156bb 2516 mbedtls_md5_update( &mbedtls_md5, params, params_len );
rahul_dahiya 0:fb8047b156bb 2517 mbedtls_md5_finish( &mbedtls_md5, hash );
rahul_dahiya 0:fb8047b156bb 2518
rahul_dahiya 0:fb8047b156bb 2519 mbedtls_sha1_starts( &mbedtls_sha1 );
rahul_dahiya 0:fb8047b156bb 2520 mbedtls_sha1_update( &mbedtls_sha1, ssl->handshake->randbytes, 64 );
rahul_dahiya 0:fb8047b156bb 2521 mbedtls_sha1_update( &mbedtls_sha1, params, params_len );
rahul_dahiya 0:fb8047b156bb 2522 mbedtls_sha1_finish( &mbedtls_sha1, hash + 16 );
rahul_dahiya 0:fb8047b156bb 2523
rahul_dahiya 0:fb8047b156bb 2524 mbedtls_md5_free( &mbedtls_md5 );
rahul_dahiya 0:fb8047b156bb 2525 mbedtls_sha1_free( &mbedtls_sha1 );
rahul_dahiya 0:fb8047b156bb 2526 }
rahul_dahiya 0:fb8047b156bb 2527 else
rahul_dahiya 0:fb8047b156bb 2528 #endif /* MBEDTLS_SSL_PROTO_SSL3 || MBEDTLS_SSL_PROTO_TLS1 || \
rahul_dahiya 0:fb8047b156bb 2529 MBEDTLS_SSL_PROTO_TLS1_1 */
rahul_dahiya 0:fb8047b156bb 2530 #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
rahul_dahiya 0:fb8047b156bb 2531 defined(MBEDTLS_SSL_PROTO_TLS1_2)
rahul_dahiya 0:fb8047b156bb 2532 if( md_alg != MBEDTLS_MD_NONE )
rahul_dahiya 0:fb8047b156bb 2533 {
rahul_dahiya 0:fb8047b156bb 2534 mbedtls_md_context_t ctx;
rahul_dahiya 0:fb8047b156bb 2535
rahul_dahiya 0:fb8047b156bb 2536 mbedtls_md_init( &ctx );
rahul_dahiya 0:fb8047b156bb 2537
rahul_dahiya 0:fb8047b156bb 2538 /* Info from md_alg will be used instead */
rahul_dahiya 0:fb8047b156bb 2539 hashlen = 0;
rahul_dahiya 0:fb8047b156bb 2540
rahul_dahiya 0:fb8047b156bb 2541 /*
rahul_dahiya 0:fb8047b156bb 2542 * digitally-signed struct {
rahul_dahiya 0:fb8047b156bb 2543 * opaque client_random[32];
rahul_dahiya 0:fb8047b156bb 2544 * opaque server_random[32];
rahul_dahiya 0:fb8047b156bb 2545 * ServerDHParams params;
rahul_dahiya 0:fb8047b156bb 2546 * };
rahul_dahiya 0:fb8047b156bb 2547 */
rahul_dahiya 0:fb8047b156bb 2548 if( ( ret = mbedtls_md_setup( &ctx,
rahul_dahiya 0:fb8047b156bb 2549 mbedtls_md_info_from_type( md_alg ), 0 ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 2550 {
rahul_dahiya 0:fb8047b156bb 2551 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_setup", ret );
rahul_dahiya 0:fb8047b156bb 2552 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 2553 MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR );
rahul_dahiya 0:fb8047b156bb 2554 return( ret );
rahul_dahiya 0:fb8047b156bb 2555 }
rahul_dahiya 0:fb8047b156bb 2556
rahul_dahiya 0:fb8047b156bb 2557 mbedtls_md_starts( &ctx );
rahul_dahiya 0:fb8047b156bb 2558 mbedtls_md_update( &ctx, ssl->handshake->randbytes, 64 );
rahul_dahiya 0:fb8047b156bb 2559 mbedtls_md_update( &ctx, params, params_len );
rahul_dahiya 0:fb8047b156bb 2560 mbedtls_md_finish( &ctx, hash );
rahul_dahiya 0:fb8047b156bb 2561 mbedtls_md_free( &ctx );
rahul_dahiya 0:fb8047b156bb 2562 }
rahul_dahiya 0:fb8047b156bb 2563 else
rahul_dahiya 0:fb8047b156bb 2564 #endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \
rahul_dahiya 0:fb8047b156bb 2565 MBEDTLS_SSL_PROTO_TLS1_2 */
rahul_dahiya 0:fb8047b156bb 2566 {
rahul_dahiya 0:fb8047b156bb 2567 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
rahul_dahiya 0:fb8047b156bb 2568 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
rahul_dahiya 0:fb8047b156bb 2569 }
rahul_dahiya 0:fb8047b156bb 2570
rahul_dahiya 0:fb8047b156bb 2571 MBEDTLS_SSL_DEBUG_BUF( 3, "parameters hash", hash, hashlen != 0 ? hashlen :
rahul_dahiya 0:fb8047b156bb 2572 (unsigned int) ( mbedtls_md_get_size( mbedtls_md_info_from_type( md_alg ) ) ) );
rahul_dahiya 0:fb8047b156bb 2573
rahul_dahiya 0:fb8047b156bb 2574 if( ssl->session_negotiate->peer_cert == NULL )
rahul_dahiya 0:fb8047b156bb 2575 {
rahul_dahiya 0:fb8047b156bb 2576 MBEDTLS_SSL_DEBUG_MSG( 2, ( "certificate required" ) );
rahul_dahiya 0:fb8047b156bb 2577 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 2578 MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
rahul_dahiya 0:fb8047b156bb 2579 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
rahul_dahiya 0:fb8047b156bb 2580 }
rahul_dahiya 0:fb8047b156bb 2581
rahul_dahiya 0:fb8047b156bb 2582 /*
rahul_dahiya 0:fb8047b156bb 2583 * Verify signature
rahul_dahiya 0:fb8047b156bb 2584 */
rahul_dahiya 0:fb8047b156bb 2585 if( ! mbedtls_pk_can_do( &ssl->session_negotiate->peer_cert->pk, pk_alg ) )
rahul_dahiya 0:fb8047b156bb 2586 {
rahul_dahiya 0:fb8047b156bb 2587 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server key exchange message" ) );
rahul_dahiya 0:fb8047b156bb 2588 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 2589 MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE );
rahul_dahiya 0:fb8047b156bb 2590 return( MBEDTLS_ERR_SSL_PK_TYPE_MISMATCH );
rahul_dahiya 0:fb8047b156bb 2591 }
rahul_dahiya 0:fb8047b156bb 2592
rahul_dahiya 0:fb8047b156bb 2593 if( ( ret = mbedtls_pk_verify( &ssl->session_negotiate->peer_cert->pk,
rahul_dahiya 0:fb8047b156bb 2594 md_alg, hash, hashlen, p, sig_len ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 2595 {
rahul_dahiya 0:fb8047b156bb 2596 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 2597 MBEDTLS_SSL_ALERT_MSG_DECRYPT_ERROR );
rahul_dahiya 0:fb8047b156bb 2598 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_pk_verify", ret );
rahul_dahiya 0:fb8047b156bb 2599 return( ret );
rahul_dahiya 0:fb8047b156bb 2600 }
rahul_dahiya 0:fb8047b156bb 2601 }
rahul_dahiya 0:fb8047b156bb 2602 #endif /* MBEDTLS_KEY_EXCHANGE__WITH_SERVER_SIGNATURE__ENABLED */
rahul_dahiya 0:fb8047b156bb 2603
rahul_dahiya 0:fb8047b156bb 2604 exit:
rahul_dahiya 0:fb8047b156bb 2605 ssl->state++;
rahul_dahiya 0:fb8047b156bb 2606
rahul_dahiya 0:fb8047b156bb 2607 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse server key exchange" ) );
rahul_dahiya 0:fb8047b156bb 2608
rahul_dahiya 0:fb8047b156bb 2609 return( 0 );
rahul_dahiya 0:fb8047b156bb 2610 }
rahul_dahiya 0:fb8047b156bb 2611
rahul_dahiya 0:fb8047b156bb 2612 #if ! defined(MBEDTLS_KEY_EXCHANGE__CERT_REQ_ALLOWED__ENABLED)
rahul_dahiya 0:fb8047b156bb 2613 static int ssl_parse_certificate_request( mbedtls_ssl_context *ssl )
rahul_dahiya 0:fb8047b156bb 2614 {
rahul_dahiya 0:fb8047b156bb 2615 const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
rahul_dahiya 0:fb8047b156bb 2616 ssl->transform_negotiate->ciphersuite_info;
rahul_dahiya 0:fb8047b156bb 2617
rahul_dahiya 0:fb8047b156bb 2618 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate request" ) );
rahul_dahiya 0:fb8047b156bb 2619
rahul_dahiya 0:fb8047b156bb 2620 if( ! mbedtls_ssl_ciphersuite_cert_req_allowed( ciphersuite_info ) )
rahul_dahiya 0:fb8047b156bb 2621 {
rahul_dahiya 0:fb8047b156bb 2622 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate request" ) );
rahul_dahiya 0:fb8047b156bb 2623 ssl->state++;
rahul_dahiya 0:fb8047b156bb 2624 return( 0 );
rahul_dahiya 0:fb8047b156bb 2625 }
rahul_dahiya 0:fb8047b156bb 2626
rahul_dahiya 0:fb8047b156bb 2627 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
rahul_dahiya 0:fb8047b156bb 2628 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
rahul_dahiya 0:fb8047b156bb 2629 }
rahul_dahiya 0:fb8047b156bb 2630 #else /* MBEDTLS_KEY_EXCHANGE__CERT_REQ_ALLOWED__ENABLED */
rahul_dahiya 0:fb8047b156bb 2631 static int ssl_parse_certificate_request( mbedtls_ssl_context *ssl )
rahul_dahiya 0:fb8047b156bb 2632 {
rahul_dahiya 0:fb8047b156bb 2633 int ret;
rahul_dahiya 0:fb8047b156bb 2634 unsigned char *buf;
rahul_dahiya 0:fb8047b156bb 2635 size_t n = 0;
rahul_dahiya 0:fb8047b156bb 2636 size_t cert_type_len = 0, dn_len = 0;
rahul_dahiya 0:fb8047b156bb 2637 const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
rahul_dahiya 0:fb8047b156bb 2638 ssl->transform_negotiate->ciphersuite_info;
rahul_dahiya 0:fb8047b156bb 2639
rahul_dahiya 0:fb8047b156bb 2640 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate request" ) );
rahul_dahiya 0:fb8047b156bb 2641
rahul_dahiya 0:fb8047b156bb 2642 if( ! mbedtls_ssl_ciphersuite_cert_req_allowed( ciphersuite_info ) )
rahul_dahiya 0:fb8047b156bb 2643 {
rahul_dahiya 0:fb8047b156bb 2644 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate request" ) );
rahul_dahiya 0:fb8047b156bb 2645 ssl->state++;
rahul_dahiya 0:fb8047b156bb 2646 return( 0 );
rahul_dahiya 0:fb8047b156bb 2647 }
rahul_dahiya 0:fb8047b156bb 2648
rahul_dahiya 0:fb8047b156bb 2649 if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 2650 {
rahul_dahiya 0:fb8047b156bb 2651 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
rahul_dahiya 0:fb8047b156bb 2652 return( ret );
rahul_dahiya 0:fb8047b156bb 2653 }
rahul_dahiya 0:fb8047b156bb 2654
rahul_dahiya 0:fb8047b156bb 2655 if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE )
rahul_dahiya 0:fb8047b156bb 2656 {
rahul_dahiya 0:fb8047b156bb 2657 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) );
rahul_dahiya 0:fb8047b156bb 2658 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 2659 MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE );
rahul_dahiya 0:fb8047b156bb 2660 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
rahul_dahiya 0:fb8047b156bb 2661 }
rahul_dahiya 0:fb8047b156bb 2662
rahul_dahiya 0:fb8047b156bb 2663 ssl->state++;
rahul_dahiya 0:fb8047b156bb 2664 ssl->client_auth = ( ssl->in_msg[0] == MBEDTLS_SSL_HS_CERTIFICATE_REQUEST );
rahul_dahiya 0:fb8047b156bb 2665
rahul_dahiya 0:fb8047b156bb 2666 MBEDTLS_SSL_DEBUG_MSG( 3, ( "got %s certificate request",
rahul_dahiya 0:fb8047b156bb 2667 ssl->client_auth ? "a" : "no" ) );
rahul_dahiya 0:fb8047b156bb 2668
rahul_dahiya 0:fb8047b156bb 2669 if( ssl->client_auth == 0 )
rahul_dahiya 0:fb8047b156bb 2670 {
rahul_dahiya 0:fb8047b156bb 2671 /* Current message is probably the ServerHelloDone */
rahul_dahiya 0:fb8047b156bb 2672 ssl->keep_current_message = 1;
rahul_dahiya 0:fb8047b156bb 2673 goto exit;
rahul_dahiya 0:fb8047b156bb 2674 }
rahul_dahiya 0:fb8047b156bb 2675
rahul_dahiya 0:fb8047b156bb 2676 /*
rahul_dahiya 0:fb8047b156bb 2677 * struct {
rahul_dahiya 0:fb8047b156bb 2678 * ClientCertificateType certificate_types<1..2^8-1>;
rahul_dahiya 0:fb8047b156bb 2679 * SignatureAndHashAlgorithm
rahul_dahiya 0:fb8047b156bb 2680 * supported_signature_algorithms<2^16-1>; -- TLS 1.2 only
rahul_dahiya 0:fb8047b156bb 2681 * DistinguishedName certificate_authorities<0..2^16-1>;
rahul_dahiya 0:fb8047b156bb 2682 * } CertificateRequest;
rahul_dahiya 0:fb8047b156bb 2683 *
rahul_dahiya 0:fb8047b156bb 2684 * Since we only support a single certificate on clients, let's just
rahul_dahiya 0:fb8047b156bb 2685 * ignore all the information that's supposed to help us pick a
rahul_dahiya 0:fb8047b156bb 2686 * certificate.
rahul_dahiya 0:fb8047b156bb 2687 *
rahul_dahiya 0:fb8047b156bb 2688 * We could check that our certificate matches the request, and bail out
rahul_dahiya 0:fb8047b156bb 2689 * if it doesn't, but it's simpler to just send the certificate anyway,
rahul_dahiya 0:fb8047b156bb 2690 * and give the server the opportunity to decide if it should terminate
rahul_dahiya 0:fb8047b156bb 2691 * the connection when it doesn't like our certificate.
rahul_dahiya 0:fb8047b156bb 2692 *
rahul_dahiya 0:fb8047b156bb 2693 * Same goes for the hash in TLS 1.2's signature_algorithms: at this
rahul_dahiya 0:fb8047b156bb 2694 * point we only have one hash available (see comments in
rahul_dahiya 0:fb8047b156bb 2695 * write_certificate_verify), so let's just use what we have.
rahul_dahiya 0:fb8047b156bb 2696 *
rahul_dahiya 0:fb8047b156bb 2697 * However, we still minimally parse the message to check it is at least
rahul_dahiya 0:fb8047b156bb 2698 * superficially sane.
rahul_dahiya 0:fb8047b156bb 2699 */
rahul_dahiya 0:fb8047b156bb 2700 buf = ssl->in_msg;
rahul_dahiya 0:fb8047b156bb 2701
rahul_dahiya 0:fb8047b156bb 2702 /* certificate_types */
rahul_dahiya 0:fb8047b156bb 2703 cert_type_len = buf[mbedtls_ssl_hs_hdr_len( ssl )];
rahul_dahiya 0:fb8047b156bb 2704 n = cert_type_len;
rahul_dahiya 0:fb8047b156bb 2705
rahul_dahiya 0:fb8047b156bb 2706 if( ssl->in_hslen < mbedtls_ssl_hs_hdr_len( ssl ) + 2 + n )
rahul_dahiya 0:fb8047b156bb 2707 {
rahul_dahiya 0:fb8047b156bb 2708 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) );
rahul_dahiya 0:fb8047b156bb 2709 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 2710 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
rahul_dahiya 0:fb8047b156bb 2711 return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_REQUEST );
rahul_dahiya 0:fb8047b156bb 2712 }
rahul_dahiya 0:fb8047b156bb 2713
rahul_dahiya 0:fb8047b156bb 2714 /* supported_signature_algorithms */
rahul_dahiya 0:fb8047b156bb 2715 #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
rahul_dahiya 0:fb8047b156bb 2716 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
rahul_dahiya 0:fb8047b156bb 2717 {
rahul_dahiya 0:fb8047b156bb 2718 size_t sig_alg_len = ( ( buf[mbedtls_ssl_hs_hdr_len( ssl ) + 1 + n] << 8 )
rahul_dahiya 0:fb8047b156bb 2719 | ( buf[mbedtls_ssl_hs_hdr_len( ssl ) + 2 + n] ) );
rahul_dahiya 0:fb8047b156bb 2720 #if defined(MBEDTLS_DEBUG_C)
rahul_dahiya 0:fb8047b156bb 2721 unsigned char* sig_alg = buf + mbedtls_ssl_hs_hdr_len( ssl ) + 3 + n;
rahul_dahiya 0:fb8047b156bb 2722 size_t i;
rahul_dahiya 0:fb8047b156bb 2723
rahul_dahiya 0:fb8047b156bb 2724 for( i = 0; i < sig_alg_len; i += 2 )
rahul_dahiya 0:fb8047b156bb 2725 {
rahul_dahiya 0:fb8047b156bb 2726 MBEDTLS_SSL_DEBUG_MSG( 3, ( "Supported Signature Algorithm found: %d"
rahul_dahiya 0:fb8047b156bb 2727 ",%d", sig_alg[i], sig_alg[i + 1] ) );
rahul_dahiya 0:fb8047b156bb 2728 }
rahul_dahiya 0:fb8047b156bb 2729 #endif
rahul_dahiya 0:fb8047b156bb 2730
rahul_dahiya 0:fb8047b156bb 2731 n += 2 + sig_alg_len;
rahul_dahiya 0:fb8047b156bb 2732
rahul_dahiya 0:fb8047b156bb 2733 if( ssl->in_hslen < mbedtls_ssl_hs_hdr_len( ssl ) + 2 + n )
rahul_dahiya 0:fb8047b156bb 2734 {
rahul_dahiya 0:fb8047b156bb 2735 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) );
rahul_dahiya 0:fb8047b156bb 2736 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 2737 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
rahul_dahiya 0:fb8047b156bb 2738 return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_REQUEST );
rahul_dahiya 0:fb8047b156bb 2739 }
rahul_dahiya 0:fb8047b156bb 2740 }
rahul_dahiya 0:fb8047b156bb 2741 #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
rahul_dahiya 0:fb8047b156bb 2742
rahul_dahiya 0:fb8047b156bb 2743 /* certificate_authorities */
rahul_dahiya 0:fb8047b156bb 2744 dn_len = ( ( buf[mbedtls_ssl_hs_hdr_len( ssl ) + 1 + n] << 8 )
rahul_dahiya 0:fb8047b156bb 2745 | ( buf[mbedtls_ssl_hs_hdr_len( ssl ) + 2 + n] ) );
rahul_dahiya 0:fb8047b156bb 2746
rahul_dahiya 0:fb8047b156bb 2747 n += dn_len;
rahul_dahiya 0:fb8047b156bb 2748 if( ssl->in_hslen != mbedtls_ssl_hs_hdr_len( ssl ) + 3 + n )
rahul_dahiya 0:fb8047b156bb 2749 {
rahul_dahiya 0:fb8047b156bb 2750 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate request message" ) );
rahul_dahiya 0:fb8047b156bb 2751 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 2752 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
rahul_dahiya 0:fb8047b156bb 2753 return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE_REQUEST );
rahul_dahiya 0:fb8047b156bb 2754 }
rahul_dahiya 0:fb8047b156bb 2755
rahul_dahiya 0:fb8047b156bb 2756 exit:
rahul_dahiya 0:fb8047b156bb 2757 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse certificate request" ) );
rahul_dahiya 0:fb8047b156bb 2758
rahul_dahiya 0:fb8047b156bb 2759 return( 0 );
rahul_dahiya 0:fb8047b156bb 2760 }
rahul_dahiya 0:fb8047b156bb 2761 #endif /* MBEDTLS_KEY_EXCHANGE__CERT_REQ_ALLOWED__ENABLED */
rahul_dahiya 0:fb8047b156bb 2762
rahul_dahiya 0:fb8047b156bb 2763 static int ssl_parse_server_hello_done( mbedtls_ssl_context *ssl )
rahul_dahiya 0:fb8047b156bb 2764 {
rahul_dahiya 0:fb8047b156bb 2765 int ret;
rahul_dahiya 0:fb8047b156bb 2766
rahul_dahiya 0:fb8047b156bb 2767 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse server hello done" ) );
rahul_dahiya 0:fb8047b156bb 2768
rahul_dahiya 0:fb8047b156bb 2769 if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 2770 {
rahul_dahiya 0:fb8047b156bb 2771 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
rahul_dahiya 0:fb8047b156bb 2772 return( ret );
rahul_dahiya 0:fb8047b156bb 2773 }
rahul_dahiya 0:fb8047b156bb 2774
rahul_dahiya 0:fb8047b156bb 2775 if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE )
rahul_dahiya 0:fb8047b156bb 2776 {
rahul_dahiya 0:fb8047b156bb 2777 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello done message" ) );
rahul_dahiya 0:fb8047b156bb 2778 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
rahul_dahiya 0:fb8047b156bb 2779 }
rahul_dahiya 0:fb8047b156bb 2780
rahul_dahiya 0:fb8047b156bb 2781 if( ssl->in_hslen != mbedtls_ssl_hs_hdr_len( ssl ) ||
rahul_dahiya 0:fb8047b156bb 2782 ssl->in_msg[0] != MBEDTLS_SSL_HS_SERVER_HELLO_DONE )
rahul_dahiya 0:fb8047b156bb 2783 {
rahul_dahiya 0:fb8047b156bb 2784 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad server hello done message" ) );
rahul_dahiya 0:fb8047b156bb 2785 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 2786 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
rahul_dahiya 0:fb8047b156bb 2787 return( MBEDTLS_ERR_SSL_BAD_HS_SERVER_HELLO_DONE );
rahul_dahiya 0:fb8047b156bb 2788 }
rahul_dahiya 0:fb8047b156bb 2789
rahul_dahiya 0:fb8047b156bb 2790 ssl->state++;
rahul_dahiya 0:fb8047b156bb 2791
rahul_dahiya 0:fb8047b156bb 2792 #if defined(MBEDTLS_SSL_PROTO_DTLS)
rahul_dahiya 0:fb8047b156bb 2793 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
rahul_dahiya 0:fb8047b156bb 2794 mbedtls_ssl_recv_flight_completed( ssl );
rahul_dahiya 0:fb8047b156bb 2795 #endif
rahul_dahiya 0:fb8047b156bb 2796
rahul_dahiya 0:fb8047b156bb 2797 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse server hello done" ) );
rahul_dahiya 0:fb8047b156bb 2798
rahul_dahiya 0:fb8047b156bb 2799 return( 0 );
rahul_dahiya 0:fb8047b156bb 2800 }
rahul_dahiya 0:fb8047b156bb 2801
rahul_dahiya 0:fb8047b156bb 2802 static int ssl_write_client_key_exchange( mbedtls_ssl_context *ssl )
rahul_dahiya 0:fb8047b156bb 2803 {
rahul_dahiya 0:fb8047b156bb 2804 int ret;
rahul_dahiya 0:fb8047b156bb 2805 size_t i, n;
rahul_dahiya 0:fb8047b156bb 2806 const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
rahul_dahiya 0:fb8047b156bb 2807 ssl->transform_negotiate->ciphersuite_info;
rahul_dahiya 0:fb8047b156bb 2808
rahul_dahiya 0:fb8047b156bb 2809 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write client key exchange" ) );
rahul_dahiya 0:fb8047b156bb 2810
rahul_dahiya 0:fb8047b156bb 2811 #if defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED)
rahul_dahiya 0:fb8047b156bb 2812 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_RSA )
rahul_dahiya 0:fb8047b156bb 2813 {
rahul_dahiya 0:fb8047b156bb 2814 /*
rahul_dahiya 0:fb8047b156bb 2815 * DHM key exchange -- send G^X mod P
rahul_dahiya 0:fb8047b156bb 2816 */
rahul_dahiya 0:fb8047b156bb 2817 n = ssl->handshake->dhm_ctx.len;
rahul_dahiya 0:fb8047b156bb 2818
rahul_dahiya 0:fb8047b156bb 2819 ssl->out_msg[4] = (unsigned char)( n >> 8 );
rahul_dahiya 0:fb8047b156bb 2820 ssl->out_msg[5] = (unsigned char)( n );
rahul_dahiya 0:fb8047b156bb 2821 i = 6;
rahul_dahiya 0:fb8047b156bb 2822
rahul_dahiya 0:fb8047b156bb 2823 ret = mbedtls_dhm_make_public( &ssl->handshake->dhm_ctx,
rahul_dahiya 0:fb8047b156bb 2824 (int) mbedtls_mpi_size( &ssl->handshake->dhm_ctx.P ),
rahul_dahiya 0:fb8047b156bb 2825 &ssl->out_msg[i], n,
rahul_dahiya 0:fb8047b156bb 2826 ssl->conf->f_rng, ssl->conf->p_rng );
rahul_dahiya 0:fb8047b156bb 2827 if( ret != 0 )
rahul_dahiya 0:fb8047b156bb 2828 {
rahul_dahiya 0:fb8047b156bb 2829 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_make_public", ret );
rahul_dahiya 0:fb8047b156bb 2830 return( ret );
rahul_dahiya 0:fb8047b156bb 2831 }
rahul_dahiya 0:fb8047b156bb 2832
rahul_dahiya 0:fb8047b156bb 2833 MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: X ", &ssl->handshake->dhm_ctx.X );
rahul_dahiya 0:fb8047b156bb 2834 MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: GX", &ssl->handshake->dhm_ctx.GX );
rahul_dahiya 0:fb8047b156bb 2835
rahul_dahiya 0:fb8047b156bb 2836 if( ( ret = mbedtls_dhm_calc_secret( &ssl->handshake->dhm_ctx,
rahul_dahiya 0:fb8047b156bb 2837 ssl->handshake->premaster,
rahul_dahiya 0:fb8047b156bb 2838 MBEDTLS_PREMASTER_SIZE,
rahul_dahiya 0:fb8047b156bb 2839 &ssl->handshake->pmslen,
rahul_dahiya 0:fb8047b156bb 2840 ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 2841 {
rahul_dahiya 0:fb8047b156bb 2842 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_calc_secret", ret );
rahul_dahiya 0:fb8047b156bb 2843 return( ret );
rahul_dahiya 0:fb8047b156bb 2844 }
rahul_dahiya 0:fb8047b156bb 2845
rahul_dahiya 0:fb8047b156bb 2846 MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: K ", &ssl->handshake->dhm_ctx.K );
rahul_dahiya 0:fb8047b156bb 2847 }
rahul_dahiya 0:fb8047b156bb 2848 else
rahul_dahiya 0:fb8047b156bb 2849 #endif /* MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED */
rahul_dahiya 0:fb8047b156bb 2850 #if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) || \
rahul_dahiya 0:fb8047b156bb 2851 defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) || \
rahul_dahiya 0:fb8047b156bb 2852 defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) || \
rahul_dahiya 0:fb8047b156bb 2853 defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)
rahul_dahiya 0:fb8047b156bb 2854 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_RSA ||
rahul_dahiya 0:fb8047b156bb 2855 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA ||
rahul_dahiya 0:fb8047b156bb 2856 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_RSA ||
rahul_dahiya 0:fb8047b156bb 2857 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA )
rahul_dahiya 0:fb8047b156bb 2858 {
rahul_dahiya 0:fb8047b156bb 2859 /*
rahul_dahiya 0:fb8047b156bb 2860 * ECDH key exchange -- send client public value
rahul_dahiya 0:fb8047b156bb 2861 */
rahul_dahiya 0:fb8047b156bb 2862 i = 4;
rahul_dahiya 0:fb8047b156bb 2863
rahul_dahiya 0:fb8047b156bb 2864 ret = mbedtls_ecdh_make_public( &ssl->handshake->ecdh_ctx,
rahul_dahiya 0:fb8047b156bb 2865 &n,
rahul_dahiya 0:fb8047b156bb 2866 &ssl->out_msg[i], 1000,
rahul_dahiya 0:fb8047b156bb 2867 ssl->conf->f_rng, ssl->conf->p_rng );
rahul_dahiya 0:fb8047b156bb 2868 if( ret != 0 )
rahul_dahiya 0:fb8047b156bb 2869 {
rahul_dahiya 0:fb8047b156bb 2870 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_make_public", ret );
rahul_dahiya 0:fb8047b156bb 2871 return( ret );
rahul_dahiya 0:fb8047b156bb 2872 }
rahul_dahiya 0:fb8047b156bb 2873
rahul_dahiya 0:fb8047b156bb 2874 MBEDTLS_SSL_DEBUG_ECP( 3, "ECDH: Q", &ssl->handshake->ecdh_ctx.Q );
rahul_dahiya 0:fb8047b156bb 2875
rahul_dahiya 0:fb8047b156bb 2876 if( ( ret = mbedtls_ecdh_calc_secret( &ssl->handshake->ecdh_ctx,
rahul_dahiya 0:fb8047b156bb 2877 &ssl->handshake->pmslen,
rahul_dahiya 0:fb8047b156bb 2878 ssl->handshake->premaster,
rahul_dahiya 0:fb8047b156bb 2879 MBEDTLS_MPI_MAX_SIZE,
rahul_dahiya 0:fb8047b156bb 2880 ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 2881 {
rahul_dahiya 0:fb8047b156bb 2882 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_calc_secret", ret );
rahul_dahiya 0:fb8047b156bb 2883 return( ret );
rahul_dahiya 0:fb8047b156bb 2884 }
rahul_dahiya 0:fb8047b156bb 2885
rahul_dahiya 0:fb8047b156bb 2886 MBEDTLS_SSL_DEBUG_MPI( 3, "ECDH: z", &ssl->handshake->ecdh_ctx.z );
rahul_dahiya 0:fb8047b156bb 2887 }
rahul_dahiya 0:fb8047b156bb 2888 else
rahul_dahiya 0:fb8047b156bb 2889 #endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED ||
rahul_dahiya 0:fb8047b156bb 2890 MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED ||
rahul_dahiya 0:fb8047b156bb 2891 MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED ||
rahul_dahiya 0:fb8047b156bb 2892 MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */
rahul_dahiya 0:fb8047b156bb 2893 #if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
rahul_dahiya 0:fb8047b156bb 2894 if( mbedtls_ssl_ciphersuite_uses_psk( ciphersuite_info ) )
rahul_dahiya 0:fb8047b156bb 2895 {
rahul_dahiya 0:fb8047b156bb 2896 /*
rahul_dahiya 0:fb8047b156bb 2897 * opaque psk_identity<0..2^16-1>;
rahul_dahiya 0:fb8047b156bb 2898 */
rahul_dahiya 0:fb8047b156bb 2899 if( ssl->conf->psk == NULL || ssl->conf->psk_identity == NULL )
rahul_dahiya 0:fb8047b156bb 2900 {
rahul_dahiya 0:fb8047b156bb 2901 MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no private key for PSK" ) );
rahul_dahiya 0:fb8047b156bb 2902 return( MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED );
rahul_dahiya 0:fb8047b156bb 2903 }
rahul_dahiya 0:fb8047b156bb 2904
rahul_dahiya 0:fb8047b156bb 2905 i = 4;
rahul_dahiya 0:fb8047b156bb 2906 n = ssl->conf->psk_identity_len;
rahul_dahiya 0:fb8047b156bb 2907
rahul_dahiya 0:fb8047b156bb 2908 if( i + 2 + n > MBEDTLS_SSL_MAX_CONTENT_LEN )
rahul_dahiya 0:fb8047b156bb 2909 {
rahul_dahiya 0:fb8047b156bb 2910 MBEDTLS_SSL_DEBUG_MSG( 1, ( "psk identity too long or "
rahul_dahiya 0:fb8047b156bb 2911 "SSL buffer too short" ) );
rahul_dahiya 0:fb8047b156bb 2912 return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
rahul_dahiya 0:fb8047b156bb 2913 }
rahul_dahiya 0:fb8047b156bb 2914
rahul_dahiya 0:fb8047b156bb 2915 ssl->out_msg[i++] = (unsigned char)( n >> 8 );
rahul_dahiya 0:fb8047b156bb 2916 ssl->out_msg[i++] = (unsigned char)( n );
rahul_dahiya 0:fb8047b156bb 2917
rahul_dahiya 0:fb8047b156bb 2918 memcpy( ssl->out_msg + i, ssl->conf->psk_identity, ssl->conf->psk_identity_len );
rahul_dahiya 0:fb8047b156bb 2919 i += ssl->conf->psk_identity_len;
rahul_dahiya 0:fb8047b156bb 2920
rahul_dahiya 0:fb8047b156bb 2921 #if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED)
rahul_dahiya 0:fb8047b156bb 2922 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK )
rahul_dahiya 0:fb8047b156bb 2923 {
rahul_dahiya 0:fb8047b156bb 2924 n = 0;
rahul_dahiya 0:fb8047b156bb 2925 }
rahul_dahiya 0:fb8047b156bb 2926 else
rahul_dahiya 0:fb8047b156bb 2927 #endif
rahul_dahiya 0:fb8047b156bb 2928 #if defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED)
rahul_dahiya 0:fb8047b156bb 2929 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK )
rahul_dahiya 0:fb8047b156bb 2930 {
rahul_dahiya 0:fb8047b156bb 2931 if( ( ret = ssl_write_encrypted_pms( ssl, i, &n, 2 ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 2932 return( ret );
rahul_dahiya 0:fb8047b156bb 2933 }
rahul_dahiya 0:fb8047b156bb 2934 else
rahul_dahiya 0:fb8047b156bb 2935 #endif
rahul_dahiya 0:fb8047b156bb 2936 #if defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED)
rahul_dahiya 0:fb8047b156bb 2937 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK )
rahul_dahiya 0:fb8047b156bb 2938 {
rahul_dahiya 0:fb8047b156bb 2939 /*
rahul_dahiya 0:fb8047b156bb 2940 * ClientDiffieHellmanPublic public (DHM send G^X mod P)
rahul_dahiya 0:fb8047b156bb 2941 */
rahul_dahiya 0:fb8047b156bb 2942 n = ssl->handshake->dhm_ctx.len;
rahul_dahiya 0:fb8047b156bb 2943
rahul_dahiya 0:fb8047b156bb 2944 if( i + 2 + n > MBEDTLS_SSL_MAX_CONTENT_LEN )
rahul_dahiya 0:fb8047b156bb 2945 {
rahul_dahiya 0:fb8047b156bb 2946 MBEDTLS_SSL_DEBUG_MSG( 1, ( "psk identity or DHM size too long"
rahul_dahiya 0:fb8047b156bb 2947 " or SSL buffer too short" ) );
rahul_dahiya 0:fb8047b156bb 2948 return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
rahul_dahiya 0:fb8047b156bb 2949 }
rahul_dahiya 0:fb8047b156bb 2950
rahul_dahiya 0:fb8047b156bb 2951 ssl->out_msg[i++] = (unsigned char)( n >> 8 );
rahul_dahiya 0:fb8047b156bb 2952 ssl->out_msg[i++] = (unsigned char)( n );
rahul_dahiya 0:fb8047b156bb 2953
rahul_dahiya 0:fb8047b156bb 2954 ret = mbedtls_dhm_make_public( &ssl->handshake->dhm_ctx,
rahul_dahiya 0:fb8047b156bb 2955 (int) mbedtls_mpi_size( &ssl->handshake->dhm_ctx.P ),
rahul_dahiya 0:fb8047b156bb 2956 &ssl->out_msg[i], n,
rahul_dahiya 0:fb8047b156bb 2957 ssl->conf->f_rng, ssl->conf->p_rng );
rahul_dahiya 0:fb8047b156bb 2958 if( ret != 0 )
rahul_dahiya 0:fb8047b156bb 2959 {
rahul_dahiya 0:fb8047b156bb 2960 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_make_public", ret );
rahul_dahiya 0:fb8047b156bb 2961 return( ret );
rahul_dahiya 0:fb8047b156bb 2962 }
rahul_dahiya 0:fb8047b156bb 2963 }
rahul_dahiya 0:fb8047b156bb 2964 else
rahul_dahiya 0:fb8047b156bb 2965 #endif /* MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */
rahul_dahiya 0:fb8047b156bb 2966 #if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
rahul_dahiya 0:fb8047b156bb 2967 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK )
rahul_dahiya 0:fb8047b156bb 2968 {
rahul_dahiya 0:fb8047b156bb 2969 /*
rahul_dahiya 0:fb8047b156bb 2970 * ClientECDiffieHellmanPublic public;
rahul_dahiya 0:fb8047b156bb 2971 */
rahul_dahiya 0:fb8047b156bb 2972 ret = mbedtls_ecdh_make_public( &ssl->handshake->ecdh_ctx, &n,
rahul_dahiya 0:fb8047b156bb 2973 &ssl->out_msg[i], MBEDTLS_SSL_MAX_CONTENT_LEN - i,
rahul_dahiya 0:fb8047b156bb 2974 ssl->conf->f_rng, ssl->conf->p_rng );
rahul_dahiya 0:fb8047b156bb 2975 if( ret != 0 )
rahul_dahiya 0:fb8047b156bb 2976 {
rahul_dahiya 0:fb8047b156bb 2977 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_make_public", ret );
rahul_dahiya 0:fb8047b156bb 2978 return( ret );
rahul_dahiya 0:fb8047b156bb 2979 }
rahul_dahiya 0:fb8047b156bb 2980
rahul_dahiya 0:fb8047b156bb 2981 MBEDTLS_SSL_DEBUG_ECP( 3, "ECDH: Q", &ssl->handshake->ecdh_ctx.Q );
rahul_dahiya 0:fb8047b156bb 2982 }
rahul_dahiya 0:fb8047b156bb 2983 else
rahul_dahiya 0:fb8047b156bb 2984 #endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */
rahul_dahiya 0:fb8047b156bb 2985 {
rahul_dahiya 0:fb8047b156bb 2986 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
rahul_dahiya 0:fb8047b156bb 2987 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
rahul_dahiya 0:fb8047b156bb 2988 }
rahul_dahiya 0:fb8047b156bb 2989
rahul_dahiya 0:fb8047b156bb 2990 if( ( ret = mbedtls_ssl_psk_derive_premaster( ssl,
rahul_dahiya 0:fb8047b156bb 2991 ciphersuite_info->key_exchange ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 2992 {
rahul_dahiya 0:fb8047b156bb 2993 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_psk_derive_premaster", ret );
rahul_dahiya 0:fb8047b156bb 2994 return( ret );
rahul_dahiya 0:fb8047b156bb 2995 }
rahul_dahiya 0:fb8047b156bb 2996 }
rahul_dahiya 0:fb8047b156bb 2997 else
rahul_dahiya 0:fb8047b156bb 2998 #endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */
rahul_dahiya 0:fb8047b156bb 2999 #if defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED)
rahul_dahiya 0:fb8047b156bb 3000 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA )
rahul_dahiya 0:fb8047b156bb 3001 {
rahul_dahiya 0:fb8047b156bb 3002 i = 4;
rahul_dahiya 0:fb8047b156bb 3003 if( ( ret = ssl_write_encrypted_pms( ssl, i, &n, 0 ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 3004 return( ret );
rahul_dahiya 0:fb8047b156bb 3005 }
rahul_dahiya 0:fb8047b156bb 3006 else
rahul_dahiya 0:fb8047b156bb 3007 #endif /* MBEDTLS_KEY_EXCHANGE_RSA_ENABLED */
rahul_dahiya 0:fb8047b156bb 3008 #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
rahul_dahiya 0:fb8047b156bb 3009 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
rahul_dahiya 0:fb8047b156bb 3010 {
rahul_dahiya 0:fb8047b156bb 3011 i = 4;
rahul_dahiya 0:fb8047b156bb 3012
rahul_dahiya 0:fb8047b156bb 3013 ret = mbedtls_ecjpake_write_round_two( &ssl->handshake->ecjpake_ctx,
rahul_dahiya 0:fb8047b156bb 3014 ssl->out_msg + i, MBEDTLS_SSL_MAX_CONTENT_LEN - i, &n,
rahul_dahiya 0:fb8047b156bb 3015 ssl->conf->f_rng, ssl->conf->p_rng );
rahul_dahiya 0:fb8047b156bb 3016 if( ret != 0 )
rahul_dahiya 0:fb8047b156bb 3017 {
rahul_dahiya 0:fb8047b156bb 3018 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_write_round_two", ret );
rahul_dahiya 0:fb8047b156bb 3019 return( ret );
rahul_dahiya 0:fb8047b156bb 3020 }
rahul_dahiya 0:fb8047b156bb 3021
rahul_dahiya 0:fb8047b156bb 3022 ret = mbedtls_ecjpake_derive_secret( &ssl->handshake->ecjpake_ctx,
rahul_dahiya 0:fb8047b156bb 3023 ssl->handshake->premaster, 32, &ssl->handshake->pmslen,
rahul_dahiya 0:fb8047b156bb 3024 ssl->conf->f_rng, ssl->conf->p_rng );
rahul_dahiya 0:fb8047b156bb 3025 if( ret != 0 )
rahul_dahiya 0:fb8047b156bb 3026 {
rahul_dahiya 0:fb8047b156bb 3027 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecjpake_derive_secret", ret );
rahul_dahiya 0:fb8047b156bb 3028 return( ret );
rahul_dahiya 0:fb8047b156bb 3029 }
rahul_dahiya 0:fb8047b156bb 3030 }
rahul_dahiya 0:fb8047b156bb 3031 else
rahul_dahiya 0:fb8047b156bb 3032 #endif /* MBEDTLS_KEY_EXCHANGE_RSA_ENABLED */
rahul_dahiya 0:fb8047b156bb 3033 {
rahul_dahiya 0:fb8047b156bb 3034 ((void) ciphersuite_info);
rahul_dahiya 0:fb8047b156bb 3035 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
rahul_dahiya 0:fb8047b156bb 3036 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
rahul_dahiya 0:fb8047b156bb 3037 }
rahul_dahiya 0:fb8047b156bb 3038
rahul_dahiya 0:fb8047b156bb 3039 ssl->out_msglen = i + n;
rahul_dahiya 0:fb8047b156bb 3040 ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
rahul_dahiya 0:fb8047b156bb 3041 ssl->out_msg[0] = MBEDTLS_SSL_HS_CLIENT_KEY_EXCHANGE;
rahul_dahiya 0:fb8047b156bb 3042
rahul_dahiya 0:fb8047b156bb 3043 ssl->state++;
rahul_dahiya 0:fb8047b156bb 3044
rahul_dahiya 0:fb8047b156bb 3045 if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 3046 {
rahul_dahiya 0:fb8047b156bb 3047 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
rahul_dahiya 0:fb8047b156bb 3048 return( ret );
rahul_dahiya 0:fb8047b156bb 3049 }
rahul_dahiya 0:fb8047b156bb 3050
rahul_dahiya 0:fb8047b156bb 3051 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write client key exchange" ) );
rahul_dahiya 0:fb8047b156bb 3052
rahul_dahiya 0:fb8047b156bb 3053 return( 0 );
rahul_dahiya 0:fb8047b156bb 3054 }
rahul_dahiya 0:fb8047b156bb 3055
rahul_dahiya 0:fb8047b156bb 3056 #if !defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) && \
rahul_dahiya 0:fb8047b156bb 3057 !defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) && \
rahul_dahiya 0:fb8047b156bb 3058 !defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) && \
rahul_dahiya 0:fb8047b156bb 3059 !defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) && \
rahul_dahiya 0:fb8047b156bb 3060 !defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)&& \
rahul_dahiya 0:fb8047b156bb 3061 !defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED)
rahul_dahiya 0:fb8047b156bb 3062 static int ssl_write_certificate_verify( mbedtls_ssl_context *ssl )
rahul_dahiya 0:fb8047b156bb 3063 {
rahul_dahiya 0:fb8047b156bb 3064 const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
rahul_dahiya 0:fb8047b156bb 3065 ssl->transform_negotiate->ciphersuite_info;
rahul_dahiya 0:fb8047b156bb 3066 int ret;
rahul_dahiya 0:fb8047b156bb 3067
rahul_dahiya 0:fb8047b156bb 3068 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate verify" ) );
rahul_dahiya 0:fb8047b156bb 3069
rahul_dahiya 0:fb8047b156bb 3070 if( ( ret = mbedtls_ssl_derive_keys( ssl ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 3071 {
rahul_dahiya 0:fb8047b156bb 3072 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_derive_keys", ret );
rahul_dahiya 0:fb8047b156bb 3073 return( ret );
rahul_dahiya 0:fb8047b156bb 3074 }
rahul_dahiya 0:fb8047b156bb 3075
rahul_dahiya 0:fb8047b156bb 3076 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK ||
rahul_dahiya 0:fb8047b156bb 3077 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK ||
rahul_dahiya 0:fb8047b156bb 3078 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK ||
rahul_dahiya 0:fb8047b156bb 3079 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK ||
rahul_dahiya 0:fb8047b156bb 3080 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
rahul_dahiya 0:fb8047b156bb 3081 {
rahul_dahiya 0:fb8047b156bb 3082 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate verify" ) );
rahul_dahiya 0:fb8047b156bb 3083 ssl->state++;
rahul_dahiya 0:fb8047b156bb 3084 return( 0 );
rahul_dahiya 0:fb8047b156bb 3085 }
rahul_dahiya 0:fb8047b156bb 3086
rahul_dahiya 0:fb8047b156bb 3087 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
rahul_dahiya 0:fb8047b156bb 3088 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
rahul_dahiya 0:fb8047b156bb 3089 }
rahul_dahiya 0:fb8047b156bb 3090 #else
rahul_dahiya 0:fb8047b156bb 3091 static int ssl_write_certificate_verify( mbedtls_ssl_context *ssl )
rahul_dahiya 0:fb8047b156bb 3092 {
rahul_dahiya 0:fb8047b156bb 3093 int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
rahul_dahiya 0:fb8047b156bb 3094 const mbedtls_ssl_ciphersuite_t *ciphersuite_info =
rahul_dahiya 0:fb8047b156bb 3095 ssl->transform_negotiate->ciphersuite_info;
rahul_dahiya 0:fb8047b156bb 3096 size_t n = 0, offset = 0;
rahul_dahiya 0:fb8047b156bb 3097 unsigned char hash[48];
rahul_dahiya 0:fb8047b156bb 3098 unsigned char *hash_start = hash;
rahul_dahiya 0:fb8047b156bb 3099 mbedtls_md_type_t md_alg = MBEDTLS_MD_NONE;
rahul_dahiya 0:fb8047b156bb 3100 unsigned int hashlen;
rahul_dahiya 0:fb8047b156bb 3101
rahul_dahiya 0:fb8047b156bb 3102 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate verify" ) );
rahul_dahiya 0:fb8047b156bb 3103
rahul_dahiya 0:fb8047b156bb 3104 if( ( ret = mbedtls_ssl_derive_keys( ssl ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 3105 {
rahul_dahiya 0:fb8047b156bb 3106 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_derive_keys", ret );
rahul_dahiya 0:fb8047b156bb 3107 return( ret );
rahul_dahiya 0:fb8047b156bb 3108 }
rahul_dahiya 0:fb8047b156bb 3109
rahul_dahiya 0:fb8047b156bb 3110 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK ||
rahul_dahiya 0:fb8047b156bb 3111 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK ||
rahul_dahiya 0:fb8047b156bb 3112 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK ||
rahul_dahiya 0:fb8047b156bb 3113 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK ||
rahul_dahiya 0:fb8047b156bb 3114 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
rahul_dahiya 0:fb8047b156bb 3115 {
rahul_dahiya 0:fb8047b156bb 3116 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate verify" ) );
rahul_dahiya 0:fb8047b156bb 3117 ssl->state++;
rahul_dahiya 0:fb8047b156bb 3118 return( 0 );
rahul_dahiya 0:fb8047b156bb 3119 }
rahul_dahiya 0:fb8047b156bb 3120
rahul_dahiya 0:fb8047b156bb 3121 if( ssl->client_auth == 0 || mbedtls_ssl_own_cert( ssl ) == NULL )
rahul_dahiya 0:fb8047b156bb 3122 {
rahul_dahiya 0:fb8047b156bb 3123 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate verify" ) );
rahul_dahiya 0:fb8047b156bb 3124 ssl->state++;
rahul_dahiya 0:fb8047b156bb 3125 return( 0 );
rahul_dahiya 0:fb8047b156bb 3126 }
rahul_dahiya 0:fb8047b156bb 3127
rahul_dahiya 0:fb8047b156bb 3128 if( mbedtls_ssl_own_key( ssl ) == NULL )
rahul_dahiya 0:fb8047b156bb 3129 {
rahul_dahiya 0:fb8047b156bb 3130 MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no private key for certificate" ) );
rahul_dahiya 0:fb8047b156bb 3131 return( MBEDTLS_ERR_SSL_PRIVATE_KEY_REQUIRED );
rahul_dahiya 0:fb8047b156bb 3132 }
rahul_dahiya 0:fb8047b156bb 3133
rahul_dahiya 0:fb8047b156bb 3134 /*
rahul_dahiya 0:fb8047b156bb 3135 * Make an RSA signature of the handshake digests
rahul_dahiya 0:fb8047b156bb 3136 */
rahul_dahiya 0:fb8047b156bb 3137 ssl->handshake->calc_verify( ssl, hash );
rahul_dahiya 0:fb8047b156bb 3138
rahul_dahiya 0:fb8047b156bb 3139 #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
rahul_dahiya 0:fb8047b156bb 3140 defined(MBEDTLS_SSL_PROTO_TLS1_1)
rahul_dahiya 0:fb8047b156bb 3141 if( ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_3 )
rahul_dahiya 0:fb8047b156bb 3142 {
rahul_dahiya 0:fb8047b156bb 3143 /*
rahul_dahiya 0:fb8047b156bb 3144 * digitally-signed struct {
rahul_dahiya 0:fb8047b156bb 3145 * opaque md5_hash[16];
rahul_dahiya 0:fb8047b156bb 3146 * opaque sha_hash[20];
rahul_dahiya 0:fb8047b156bb 3147 * };
rahul_dahiya 0:fb8047b156bb 3148 *
rahul_dahiya 0:fb8047b156bb 3149 * md5_hash
rahul_dahiya 0:fb8047b156bb 3150 * MD5(handshake_messages);
rahul_dahiya 0:fb8047b156bb 3151 *
rahul_dahiya 0:fb8047b156bb 3152 * sha_hash
rahul_dahiya 0:fb8047b156bb 3153 * SHA(handshake_messages);
rahul_dahiya 0:fb8047b156bb 3154 */
rahul_dahiya 0:fb8047b156bb 3155 hashlen = 36;
rahul_dahiya 0:fb8047b156bb 3156 md_alg = MBEDTLS_MD_NONE;
rahul_dahiya 0:fb8047b156bb 3157
rahul_dahiya 0:fb8047b156bb 3158 /*
rahul_dahiya 0:fb8047b156bb 3159 * For ECDSA, default hash is SHA-1 only
rahul_dahiya 0:fb8047b156bb 3160 */
rahul_dahiya 0:fb8047b156bb 3161 if( mbedtls_pk_can_do( mbedtls_ssl_own_key( ssl ), MBEDTLS_PK_ECDSA ) )
rahul_dahiya 0:fb8047b156bb 3162 {
rahul_dahiya 0:fb8047b156bb 3163 hash_start += 16;
rahul_dahiya 0:fb8047b156bb 3164 hashlen -= 16;
rahul_dahiya 0:fb8047b156bb 3165 md_alg = MBEDTLS_MD_SHA1;
rahul_dahiya 0:fb8047b156bb 3166 }
rahul_dahiya 0:fb8047b156bb 3167 }
rahul_dahiya 0:fb8047b156bb 3168 else
rahul_dahiya 0:fb8047b156bb 3169 #endif /* MBEDTLS_SSL_PROTO_SSL3 || MBEDTLS_SSL_PROTO_TLS1 || \
rahul_dahiya 0:fb8047b156bb 3170 MBEDTLS_SSL_PROTO_TLS1_1 */
rahul_dahiya 0:fb8047b156bb 3171 #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
rahul_dahiya 0:fb8047b156bb 3172 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
rahul_dahiya 0:fb8047b156bb 3173 {
rahul_dahiya 0:fb8047b156bb 3174 /*
rahul_dahiya 0:fb8047b156bb 3175 * digitally-signed struct {
rahul_dahiya 0:fb8047b156bb 3176 * opaque handshake_messages[handshake_messages_length];
rahul_dahiya 0:fb8047b156bb 3177 * };
rahul_dahiya 0:fb8047b156bb 3178 *
rahul_dahiya 0:fb8047b156bb 3179 * Taking shortcut here. We assume that the server always allows the
rahul_dahiya 0:fb8047b156bb 3180 * PRF Hash function and has sent it in the allowed signature
rahul_dahiya 0:fb8047b156bb 3181 * algorithms list received in the Certificate Request message.
rahul_dahiya 0:fb8047b156bb 3182 *
rahul_dahiya 0:fb8047b156bb 3183 * Until we encounter a server that does not, we will take this
rahul_dahiya 0:fb8047b156bb 3184 * shortcut.
rahul_dahiya 0:fb8047b156bb 3185 *
rahul_dahiya 0:fb8047b156bb 3186 * Reason: Otherwise we should have running hashes for SHA512 and SHA224
rahul_dahiya 0:fb8047b156bb 3187 * in order to satisfy 'weird' needs from the server side.
rahul_dahiya 0:fb8047b156bb 3188 */
rahul_dahiya 0:fb8047b156bb 3189 if( ssl->transform_negotiate->ciphersuite_info->mac ==
rahul_dahiya 0:fb8047b156bb 3190 MBEDTLS_MD_SHA384 )
rahul_dahiya 0:fb8047b156bb 3191 {
rahul_dahiya 0:fb8047b156bb 3192 md_alg = MBEDTLS_MD_SHA384;
rahul_dahiya 0:fb8047b156bb 3193 ssl->out_msg[4] = MBEDTLS_SSL_HASH_SHA384;
rahul_dahiya 0:fb8047b156bb 3194 }
rahul_dahiya 0:fb8047b156bb 3195 else
rahul_dahiya 0:fb8047b156bb 3196 {
rahul_dahiya 0:fb8047b156bb 3197 md_alg = MBEDTLS_MD_SHA256;
rahul_dahiya 0:fb8047b156bb 3198 ssl->out_msg[4] = MBEDTLS_SSL_HASH_SHA256;
rahul_dahiya 0:fb8047b156bb 3199 }
rahul_dahiya 0:fb8047b156bb 3200 ssl->out_msg[5] = mbedtls_ssl_sig_from_pk( mbedtls_ssl_own_key( ssl ) );
rahul_dahiya 0:fb8047b156bb 3201
rahul_dahiya 0:fb8047b156bb 3202 /* Info from md_alg will be used instead */
rahul_dahiya 0:fb8047b156bb 3203 hashlen = 0;
rahul_dahiya 0:fb8047b156bb 3204 offset = 2;
rahul_dahiya 0:fb8047b156bb 3205 }
rahul_dahiya 0:fb8047b156bb 3206 else
rahul_dahiya 0:fb8047b156bb 3207 #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
rahul_dahiya 0:fb8047b156bb 3208 {
rahul_dahiya 0:fb8047b156bb 3209 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
rahul_dahiya 0:fb8047b156bb 3210 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
rahul_dahiya 0:fb8047b156bb 3211 }
rahul_dahiya 0:fb8047b156bb 3212
rahul_dahiya 0:fb8047b156bb 3213 if( ( ret = mbedtls_pk_sign( mbedtls_ssl_own_key( ssl ), md_alg, hash_start, hashlen,
rahul_dahiya 0:fb8047b156bb 3214 ssl->out_msg + 6 + offset, &n,
rahul_dahiya 0:fb8047b156bb 3215 ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 3216 {
rahul_dahiya 0:fb8047b156bb 3217 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_pk_sign", ret );
rahul_dahiya 0:fb8047b156bb 3218 return( ret );
rahul_dahiya 0:fb8047b156bb 3219 }
rahul_dahiya 0:fb8047b156bb 3220
rahul_dahiya 0:fb8047b156bb 3221 ssl->out_msg[4 + offset] = (unsigned char)( n >> 8 );
rahul_dahiya 0:fb8047b156bb 3222 ssl->out_msg[5 + offset] = (unsigned char)( n );
rahul_dahiya 0:fb8047b156bb 3223
rahul_dahiya 0:fb8047b156bb 3224 ssl->out_msglen = 6 + n + offset;
rahul_dahiya 0:fb8047b156bb 3225 ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
rahul_dahiya 0:fb8047b156bb 3226 ssl->out_msg[0] = MBEDTLS_SSL_HS_CERTIFICATE_VERIFY;
rahul_dahiya 0:fb8047b156bb 3227
rahul_dahiya 0:fb8047b156bb 3228 ssl->state++;
rahul_dahiya 0:fb8047b156bb 3229
rahul_dahiya 0:fb8047b156bb 3230 if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 3231 {
rahul_dahiya 0:fb8047b156bb 3232 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
rahul_dahiya 0:fb8047b156bb 3233 return( ret );
rahul_dahiya 0:fb8047b156bb 3234 }
rahul_dahiya 0:fb8047b156bb 3235
rahul_dahiya 0:fb8047b156bb 3236 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write certificate verify" ) );
rahul_dahiya 0:fb8047b156bb 3237
rahul_dahiya 0:fb8047b156bb 3238 return( ret );
rahul_dahiya 0:fb8047b156bb 3239 }
rahul_dahiya 0:fb8047b156bb 3240 #endif /* !MBEDTLS_KEY_EXCHANGE_RSA_ENABLED &&
rahul_dahiya 0:fb8047b156bb 3241 !MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED &&
rahul_dahiya 0:fb8047b156bb 3242 !MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED &&
rahul_dahiya 0:fb8047b156bb 3243 !MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED &&
rahul_dahiya 0:fb8047b156bb 3244 !MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED &&
rahul_dahiya 0:fb8047b156bb 3245 !MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED */
rahul_dahiya 0:fb8047b156bb 3246
rahul_dahiya 0:fb8047b156bb 3247 #if defined(MBEDTLS_SSL_SESSION_TICKETS)
rahul_dahiya 0:fb8047b156bb 3248 static int ssl_parse_new_session_ticket( mbedtls_ssl_context *ssl )
rahul_dahiya 0:fb8047b156bb 3249 {
rahul_dahiya 0:fb8047b156bb 3250 int ret;
rahul_dahiya 0:fb8047b156bb 3251 uint32_t lifetime;
rahul_dahiya 0:fb8047b156bb 3252 size_t ticket_len;
rahul_dahiya 0:fb8047b156bb 3253 unsigned char *ticket;
rahul_dahiya 0:fb8047b156bb 3254 const unsigned char *msg;
rahul_dahiya 0:fb8047b156bb 3255
rahul_dahiya 0:fb8047b156bb 3256 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse new session ticket" ) );
rahul_dahiya 0:fb8047b156bb 3257
rahul_dahiya 0:fb8047b156bb 3258 if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 3259 {
rahul_dahiya 0:fb8047b156bb 3260 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
rahul_dahiya 0:fb8047b156bb 3261 return( ret );
rahul_dahiya 0:fb8047b156bb 3262 }
rahul_dahiya 0:fb8047b156bb 3263
rahul_dahiya 0:fb8047b156bb 3264 if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE )
rahul_dahiya 0:fb8047b156bb 3265 {
rahul_dahiya 0:fb8047b156bb 3266 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad new session ticket message" ) );
rahul_dahiya 0:fb8047b156bb 3267 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 3268 MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE );
rahul_dahiya 0:fb8047b156bb 3269 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
rahul_dahiya 0:fb8047b156bb 3270 }
rahul_dahiya 0:fb8047b156bb 3271
rahul_dahiya 0:fb8047b156bb 3272 /*
rahul_dahiya 0:fb8047b156bb 3273 * struct {
rahul_dahiya 0:fb8047b156bb 3274 * uint32 ticket_lifetime_hint;
rahul_dahiya 0:fb8047b156bb 3275 * opaque ticket<0..2^16-1>;
rahul_dahiya 0:fb8047b156bb 3276 * } NewSessionTicket;
rahul_dahiya 0:fb8047b156bb 3277 *
rahul_dahiya 0:fb8047b156bb 3278 * 0 . 3 ticket_lifetime_hint
rahul_dahiya 0:fb8047b156bb 3279 * 4 . 5 ticket_len (n)
rahul_dahiya 0:fb8047b156bb 3280 * 6 . 5+n ticket content
rahul_dahiya 0:fb8047b156bb 3281 */
rahul_dahiya 0:fb8047b156bb 3282 if( ssl->in_msg[0] != MBEDTLS_SSL_HS_NEW_SESSION_TICKET ||
rahul_dahiya 0:fb8047b156bb 3283 ssl->in_hslen < 6 + mbedtls_ssl_hs_hdr_len( ssl ) )
rahul_dahiya 0:fb8047b156bb 3284 {
rahul_dahiya 0:fb8047b156bb 3285 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad new session ticket message" ) );
rahul_dahiya 0:fb8047b156bb 3286 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 3287 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
rahul_dahiya 0:fb8047b156bb 3288 return( MBEDTLS_ERR_SSL_BAD_HS_NEW_SESSION_TICKET );
rahul_dahiya 0:fb8047b156bb 3289 }
rahul_dahiya 0:fb8047b156bb 3290
rahul_dahiya 0:fb8047b156bb 3291 msg = ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl );
rahul_dahiya 0:fb8047b156bb 3292
rahul_dahiya 0:fb8047b156bb 3293 lifetime = ( msg[0] << 24 ) | ( msg[1] << 16 ) |
rahul_dahiya 0:fb8047b156bb 3294 ( msg[2] << 8 ) | ( msg[3] );
rahul_dahiya 0:fb8047b156bb 3295
rahul_dahiya 0:fb8047b156bb 3296 ticket_len = ( msg[4] << 8 ) | ( msg[5] );
rahul_dahiya 0:fb8047b156bb 3297
rahul_dahiya 0:fb8047b156bb 3298 if( ticket_len + 6 + mbedtls_ssl_hs_hdr_len( ssl ) != ssl->in_hslen )
rahul_dahiya 0:fb8047b156bb 3299 {
rahul_dahiya 0:fb8047b156bb 3300 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad new session ticket message" ) );
rahul_dahiya 0:fb8047b156bb 3301 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 3302 MBEDTLS_SSL_ALERT_MSG_DECODE_ERROR );
rahul_dahiya 0:fb8047b156bb 3303 return( MBEDTLS_ERR_SSL_BAD_HS_NEW_SESSION_TICKET );
rahul_dahiya 0:fb8047b156bb 3304 }
rahul_dahiya 0:fb8047b156bb 3305
rahul_dahiya 0:fb8047b156bb 3306 MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket length: %d", ticket_len ) );
rahul_dahiya 0:fb8047b156bb 3307
rahul_dahiya 0:fb8047b156bb 3308 /* We're not waiting for a NewSessionTicket message any more */
rahul_dahiya 0:fb8047b156bb 3309 ssl->handshake->new_session_ticket = 0;
rahul_dahiya 0:fb8047b156bb 3310 ssl->state = MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC;
rahul_dahiya 0:fb8047b156bb 3311
rahul_dahiya 0:fb8047b156bb 3312 /*
rahul_dahiya 0:fb8047b156bb 3313 * Zero-length ticket means the server changed his mind and doesn't want
rahul_dahiya 0:fb8047b156bb 3314 * to send a ticket after all, so just forget it
rahul_dahiya 0:fb8047b156bb 3315 */
rahul_dahiya 0:fb8047b156bb 3316 if( ticket_len == 0 )
rahul_dahiya 0:fb8047b156bb 3317 return( 0 );
rahul_dahiya 0:fb8047b156bb 3318
rahul_dahiya 0:fb8047b156bb 3319 mbedtls_zeroize( ssl->session_negotiate->ticket,
rahul_dahiya 0:fb8047b156bb 3320 ssl->session_negotiate->ticket_len );
rahul_dahiya 0:fb8047b156bb 3321 mbedtls_free( ssl->session_negotiate->ticket );
rahul_dahiya 0:fb8047b156bb 3322 ssl->session_negotiate->ticket = NULL;
rahul_dahiya 0:fb8047b156bb 3323 ssl->session_negotiate->ticket_len = 0;
rahul_dahiya 0:fb8047b156bb 3324
rahul_dahiya 0:fb8047b156bb 3325 if( ( ticket = mbedtls_calloc( 1, ticket_len ) ) == NULL )
rahul_dahiya 0:fb8047b156bb 3326 {
rahul_dahiya 0:fb8047b156bb 3327 MBEDTLS_SSL_DEBUG_MSG( 1, ( "ticket alloc failed" ) );
rahul_dahiya 0:fb8047b156bb 3328 mbedtls_ssl_send_alert_message( ssl, MBEDTLS_SSL_ALERT_LEVEL_FATAL,
rahul_dahiya 0:fb8047b156bb 3329 MBEDTLS_SSL_ALERT_MSG_INTERNAL_ERROR );
rahul_dahiya 0:fb8047b156bb 3330 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
rahul_dahiya 0:fb8047b156bb 3331 }
rahul_dahiya 0:fb8047b156bb 3332
rahul_dahiya 0:fb8047b156bb 3333 memcpy( ticket, msg + 6, ticket_len );
rahul_dahiya 0:fb8047b156bb 3334
rahul_dahiya 0:fb8047b156bb 3335 ssl->session_negotiate->ticket = ticket;
rahul_dahiya 0:fb8047b156bb 3336 ssl->session_negotiate->ticket_len = ticket_len;
rahul_dahiya 0:fb8047b156bb 3337 ssl->session_negotiate->ticket_lifetime = lifetime;
rahul_dahiya 0:fb8047b156bb 3338
rahul_dahiya 0:fb8047b156bb 3339 /*
rahul_dahiya 0:fb8047b156bb 3340 * RFC 5077 section 3.4:
rahul_dahiya 0:fb8047b156bb 3341 * "If the client receives a session ticket from the server, then it
rahul_dahiya 0:fb8047b156bb 3342 * discards any Session ID that was sent in the ServerHello."
rahul_dahiya 0:fb8047b156bb 3343 */
rahul_dahiya 0:fb8047b156bb 3344 MBEDTLS_SSL_DEBUG_MSG( 3, ( "ticket in use, discarding session id" ) );
rahul_dahiya 0:fb8047b156bb 3345 ssl->session_negotiate->id_len = 0;
rahul_dahiya 0:fb8047b156bb 3346
rahul_dahiya 0:fb8047b156bb 3347 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse new session ticket" ) );
rahul_dahiya 0:fb8047b156bb 3348
rahul_dahiya 0:fb8047b156bb 3349 return( 0 );
rahul_dahiya 0:fb8047b156bb 3350 }
rahul_dahiya 0:fb8047b156bb 3351 #endif /* MBEDTLS_SSL_SESSION_TICKETS */
rahul_dahiya 0:fb8047b156bb 3352
rahul_dahiya 0:fb8047b156bb 3353 /*
rahul_dahiya 0:fb8047b156bb 3354 * SSL handshake -- client side -- single step
rahul_dahiya 0:fb8047b156bb 3355 */
rahul_dahiya 0:fb8047b156bb 3356 int mbedtls_ssl_handshake_client_step( mbedtls_ssl_context *ssl )
rahul_dahiya 0:fb8047b156bb 3357 {
rahul_dahiya 0:fb8047b156bb 3358 int ret = 0;
rahul_dahiya 0:fb8047b156bb 3359
rahul_dahiya 0:fb8047b156bb 3360 if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER || ssl->handshake == NULL )
rahul_dahiya 0:fb8047b156bb 3361 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
rahul_dahiya 0:fb8047b156bb 3362
rahul_dahiya 0:fb8047b156bb 3363 MBEDTLS_SSL_DEBUG_MSG( 2, ( "client state: %d", ssl->state ) );
rahul_dahiya 0:fb8047b156bb 3364
rahul_dahiya 0:fb8047b156bb 3365 if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 3366 return( ret );
rahul_dahiya 0:fb8047b156bb 3367
rahul_dahiya 0:fb8047b156bb 3368 #if defined(MBEDTLS_SSL_PROTO_DTLS)
rahul_dahiya 0:fb8047b156bb 3369 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
rahul_dahiya 0:fb8047b156bb 3370 ssl->handshake->retransmit_state == MBEDTLS_SSL_RETRANS_SENDING )
rahul_dahiya 0:fb8047b156bb 3371 {
rahul_dahiya 0:fb8047b156bb 3372 if( ( ret = mbedtls_ssl_resend( ssl ) ) != 0 )
rahul_dahiya 0:fb8047b156bb 3373 return( ret );
rahul_dahiya 0:fb8047b156bb 3374 }
rahul_dahiya 0:fb8047b156bb 3375 #endif
rahul_dahiya 0:fb8047b156bb 3376
rahul_dahiya 0:fb8047b156bb 3377 /* Change state now, so that it is right in mbedtls_ssl_read_record(), used
rahul_dahiya 0:fb8047b156bb 3378 * by DTLS for dropping out-of-sequence ChangeCipherSpec records */
rahul_dahiya 0:fb8047b156bb 3379 #if defined(MBEDTLS_SSL_SESSION_TICKETS)
rahul_dahiya 0:fb8047b156bb 3380 if( ssl->state == MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC &&
rahul_dahiya 0:fb8047b156bb 3381 ssl->handshake->new_session_ticket != 0 )
rahul_dahiya 0:fb8047b156bb 3382 {
rahul_dahiya 0:fb8047b156bb 3383 ssl->state = MBEDTLS_SSL_SERVER_NEW_SESSION_TICKET;
rahul_dahiya 0:fb8047b156bb 3384 }
rahul_dahiya 0:fb8047b156bb 3385 #endif
rahul_dahiya 0:fb8047b156bb 3386
rahul_dahiya 0:fb8047b156bb 3387 switch( ssl->state )
rahul_dahiya 0:fb8047b156bb 3388 {
rahul_dahiya 0:fb8047b156bb 3389 case MBEDTLS_SSL_HELLO_REQUEST:
rahul_dahiya 0:fb8047b156bb 3390 ssl->state = MBEDTLS_SSL_CLIENT_HELLO;
rahul_dahiya 0:fb8047b156bb 3391 break;
rahul_dahiya 0:fb8047b156bb 3392
rahul_dahiya 0:fb8047b156bb 3393 /*
rahul_dahiya 0:fb8047b156bb 3394 * ==> ClientHello
rahul_dahiya 0:fb8047b156bb 3395 */
rahul_dahiya 0:fb8047b156bb 3396 case MBEDTLS_SSL_CLIENT_HELLO:
rahul_dahiya 0:fb8047b156bb 3397 ret = ssl_write_client_hello( ssl );
rahul_dahiya 0:fb8047b156bb 3398 break;
rahul_dahiya 0:fb8047b156bb 3399
rahul_dahiya 0:fb8047b156bb 3400 /*
rahul_dahiya 0:fb8047b156bb 3401 * <== ServerHello
rahul_dahiya 0:fb8047b156bb 3402 * Certificate
rahul_dahiya 0:fb8047b156bb 3403 * ( ServerKeyExchange )
rahul_dahiya 0:fb8047b156bb 3404 * ( CertificateRequest )
rahul_dahiya 0:fb8047b156bb 3405 * ServerHelloDone
rahul_dahiya 0:fb8047b156bb 3406 */
rahul_dahiya 0:fb8047b156bb 3407 case MBEDTLS_SSL_SERVER_HELLO:
rahul_dahiya 0:fb8047b156bb 3408 ret = ssl_parse_server_hello( ssl );
rahul_dahiya 0:fb8047b156bb 3409 break;
rahul_dahiya 0:fb8047b156bb 3410
rahul_dahiya 0:fb8047b156bb 3411 case MBEDTLS_SSL_SERVER_CERTIFICATE:
rahul_dahiya 0:fb8047b156bb 3412 ret = mbedtls_ssl_parse_certificate( ssl );
rahul_dahiya 0:fb8047b156bb 3413 break;
rahul_dahiya 0:fb8047b156bb 3414
rahul_dahiya 0:fb8047b156bb 3415 case MBEDTLS_SSL_SERVER_KEY_EXCHANGE:
rahul_dahiya 0:fb8047b156bb 3416 ret = ssl_parse_server_key_exchange( ssl );
rahul_dahiya 0:fb8047b156bb 3417 break;
rahul_dahiya 0:fb8047b156bb 3418
rahul_dahiya 0:fb8047b156bb 3419 case MBEDTLS_SSL_CERTIFICATE_REQUEST:
rahul_dahiya 0:fb8047b156bb 3420 ret = ssl_parse_certificate_request( ssl );
rahul_dahiya 0:fb8047b156bb 3421 break;
rahul_dahiya 0:fb8047b156bb 3422
rahul_dahiya 0:fb8047b156bb 3423 case MBEDTLS_SSL_SERVER_HELLO_DONE:
rahul_dahiya 0:fb8047b156bb 3424 ret = ssl_parse_server_hello_done( ssl );
rahul_dahiya 0:fb8047b156bb 3425 break;
rahul_dahiya 0:fb8047b156bb 3426
rahul_dahiya 0:fb8047b156bb 3427 /*
rahul_dahiya 0:fb8047b156bb 3428 * ==> ( Certificate/Alert )
rahul_dahiya 0:fb8047b156bb 3429 * ClientKeyExchange
rahul_dahiya 0:fb8047b156bb 3430 * ( CertificateVerify )
rahul_dahiya 0:fb8047b156bb 3431 * ChangeCipherSpec
rahul_dahiya 0:fb8047b156bb 3432 * Finished
rahul_dahiya 0:fb8047b156bb 3433 */
rahul_dahiya 0:fb8047b156bb 3434 case MBEDTLS_SSL_CLIENT_CERTIFICATE:
rahul_dahiya 0:fb8047b156bb 3435 ret = mbedtls_ssl_write_certificate( ssl );
rahul_dahiya 0:fb8047b156bb 3436 break;
rahul_dahiya 0:fb8047b156bb 3437
rahul_dahiya 0:fb8047b156bb 3438 case MBEDTLS_SSL_CLIENT_KEY_EXCHANGE:
rahul_dahiya 0:fb8047b156bb 3439 ret = ssl_write_client_key_exchange( ssl );
rahul_dahiya 0:fb8047b156bb 3440 break;
rahul_dahiya 0:fb8047b156bb 3441
rahul_dahiya 0:fb8047b156bb 3442 case MBEDTLS_SSL_CERTIFICATE_VERIFY:
rahul_dahiya 0:fb8047b156bb 3443 ret = ssl_write_certificate_verify( ssl );
rahul_dahiya 0:fb8047b156bb 3444 break;
rahul_dahiya 0:fb8047b156bb 3445
rahul_dahiya 0:fb8047b156bb 3446 case MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC:
rahul_dahiya 0:fb8047b156bb 3447 ret = mbedtls_ssl_write_change_cipher_spec( ssl );
rahul_dahiya 0:fb8047b156bb 3448 break;
rahul_dahiya 0:fb8047b156bb 3449
rahul_dahiya 0:fb8047b156bb 3450 case MBEDTLS_SSL_CLIENT_FINISHED:
rahul_dahiya 0:fb8047b156bb 3451 ret = mbedtls_ssl_write_finished( ssl );
rahul_dahiya 0:fb8047b156bb 3452 break;
rahul_dahiya 0:fb8047b156bb 3453
rahul_dahiya 0:fb8047b156bb 3454 /*
rahul_dahiya 0:fb8047b156bb 3455 * <== ( NewSessionTicket )
rahul_dahiya 0:fb8047b156bb 3456 * ChangeCipherSpec
rahul_dahiya 0:fb8047b156bb 3457 * Finished
rahul_dahiya 0:fb8047b156bb 3458 */
rahul_dahiya 0:fb8047b156bb 3459 #if defined(MBEDTLS_SSL_SESSION_TICKETS)
rahul_dahiya 0:fb8047b156bb 3460 case MBEDTLS_SSL_SERVER_NEW_SESSION_TICKET:
rahul_dahiya 0:fb8047b156bb 3461 ret = ssl_parse_new_session_ticket( ssl );
rahul_dahiya 0:fb8047b156bb 3462 break;
rahul_dahiya 0:fb8047b156bb 3463 #endif
rahul_dahiya 0:fb8047b156bb 3464
rahul_dahiya 0:fb8047b156bb 3465 case MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC:
rahul_dahiya 0:fb8047b156bb 3466 ret = mbedtls_ssl_parse_change_cipher_spec( ssl );
rahul_dahiya 0:fb8047b156bb 3467 break;
rahul_dahiya 0:fb8047b156bb 3468
rahul_dahiya 0:fb8047b156bb 3469 case MBEDTLS_SSL_SERVER_FINISHED:
rahul_dahiya 0:fb8047b156bb 3470 ret = mbedtls_ssl_parse_finished( ssl );
rahul_dahiya 0:fb8047b156bb 3471 break;
rahul_dahiya 0:fb8047b156bb 3472
rahul_dahiya 0:fb8047b156bb 3473 case MBEDTLS_SSL_FLUSH_BUFFERS:
rahul_dahiya 0:fb8047b156bb 3474 MBEDTLS_SSL_DEBUG_MSG( 2, ( "handshake: done" ) );
rahul_dahiya 0:fb8047b156bb 3475 ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP;
rahul_dahiya 0:fb8047b156bb 3476 break;
rahul_dahiya 0:fb8047b156bb 3477
rahul_dahiya 0:fb8047b156bb 3478 case MBEDTLS_SSL_HANDSHAKE_WRAPUP:
rahul_dahiya 0:fb8047b156bb 3479 mbedtls_ssl_handshake_wrapup( ssl );
rahul_dahiya 0:fb8047b156bb 3480 break;
rahul_dahiya 0:fb8047b156bb 3481
rahul_dahiya 0:fb8047b156bb 3482 default:
rahul_dahiya 0:fb8047b156bb 3483 MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid state %d", ssl->state ) );
rahul_dahiya 0:fb8047b156bb 3484 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
rahul_dahiya 0:fb8047b156bb 3485 }
rahul_dahiya 0:fb8047b156bb 3486
rahul_dahiya 0:fb8047b156bb 3487 return( ret );
rahul_dahiya 0:fb8047b156bb 3488 }
rahul_dahiya 0:fb8047b156bb 3489 #endif /* MBEDTLS_SSL_CLI_C */