Kev Mann / mbed-dev-OS5_10_4

RTC auf true

features/mbedtls/src/ssl_ticket.c@0:38ceb79fef03, 2018-11-28 (annotated)

Committer:
kevman
Date:
Wed Nov 28 15:10:15 2018 +0000
Revision:
0:38ceb79fef03
RTC modified

Who changed what in which revision?

UserRevisionLine numberNew contents of line
kevman 0:38ceb79fef03 1 /*
kevman 0:38ceb79fef03 2 * TLS server tickets callbacks implementation
kevman 0:38ceb79fef03 3 *
kevman 0:38ceb79fef03 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
kevman 0:38ceb79fef03 5 * SPDX-License-Identifier: Apache-2.0
kevman 0:38ceb79fef03 6 *
kevman 0:38ceb79fef03 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
kevman 0:38ceb79fef03 8 * not use this file except in compliance with the License.
kevman 0:38ceb79fef03 9 * You may obtain a copy of the License at
kevman 0:38ceb79fef03 10 *
kevman 0:38ceb79fef03 11 * http://www.apache.org/licenses/LICENSE-2.0
kevman 0:38ceb79fef03 12 *
kevman 0:38ceb79fef03 13 * Unless required by applicable law or agreed to in writing, software
kevman 0:38ceb79fef03 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
kevman 0:38ceb79fef03 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
kevman 0:38ceb79fef03 16 * See the License for the specific language governing permissions and
kevman 0:38ceb79fef03 17 * limitations under the License.
kevman 0:38ceb79fef03 18 *
kevman 0:38ceb79fef03 19 * This file is part of mbed TLS (https://tls.mbed.org)
kevman 0:38ceb79fef03 20 */
kevman 0:38ceb79fef03 21
kevman 0:38ceb79fef03 22 #if !defined(MBEDTLS_CONFIG_FILE)
kevman 0:38ceb79fef03 23 #include "mbedtls/config.h"
kevman 0:38ceb79fef03 24 #else
kevman 0:38ceb79fef03 25 #include MBEDTLS_CONFIG_FILE
kevman 0:38ceb79fef03 26 #endif
kevman 0:38ceb79fef03 27
kevman 0:38ceb79fef03 28 #if defined(MBEDTLS_SSL_TICKET_C)
kevman 0:38ceb79fef03 29
kevman 0:38ceb79fef03 30 #if defined(MBEDTLS_PLATFORM_C)
kevman 0:38ceb79fef03 31 #include "mbedtls/platform.h"
kevman 0:38ceb79fef03 32 #else
kevman 0:38ceb79fef03 33 #include <stdlib.h>
kevman 0:38ceb79fef03 34 #define mbedtls_calloc calloc
kevman 0:38ceb79fef03 35 #define mbedtls_free free
kevman 0:38ceb79fef03 36 #endif
kevman 0:38ceb79fef03 37
kevman 0:38ceb79fef03 38 #include "mbedtls/ssl_ticket.h"
kevman 0:38ceb79fef03 39 #include "mbedtls/platform_util.h"
kevman 0:38ceb79fef03 40
kevman 0:38ceb79fef03 41 #include <string.h>
kevman 0:38ceb79fef03 42
kevman 0:38ceb79fef03 43 /*
kevman 0:38ceb79fef03 44 * Initialze context
kevman 0:38ceb79fef03 45 */
kevman 0:38ceb79fef03 46 void mbedtls_ssl_ticket_init( mbedtls_ssl_ticket_context *ctx )
kevman 0:38ceb79fef03 47 {
kevman 0:38ceb79fef03 48 memset( ctx, 0, sizeof( mbedtls_ssl_ticket_context ) );
kevman 0:38ceb79fef03 49
kevman 0:38ceb79fef03 50 #if defined(MBEDTLS_THREADING_C)
kevman 0:38ceb79fef03 51 mbedtls_mutex_init( &ctx->mutex );
kevman 0:38ceb79fef03 52 #endif
kevman 0:38ceb79fef03 53 }
kevman 0:38ceb79fef03 54
kevman 0:38ceb79fef03 55 #define MAX_KEY_BYTES 32 /* 256 bits */
kevman 0:38ceb79fef03 56
kevman 0:38ceb79fef03 57 /*
kevman 0:38ceb79fef03 58 * Generate/update a key
kevman 0:38ceb79fef03 59 */
kevman 0:38ceb79fef03 60 static int ssl_ticket_gen_key( mbedtls_ssl_ticket_context *ctx,
kevman 0:38ceb79fef03 61 unsigned char index )
kevman 0:38ceb79fef03 62 {
kevman 0:38ceb79fef03 63 int ret;
kevman 0:38ceb79fef03 64 unsigned char buf[MAX_KEY_BYTES];
kevman 0:38ceb79fef03 65 mbedtls_ssl_ticket_key *key = ctx->keys + index;
kevman 0:38ceb79fef03 66
kevman 0:38ceb79fef03 67 #if defined(MBEDTLS_HAVE_TIME)
kevman 0:38ceb79fef03 68 key->generation_time = (uint32_t) mbedtls_time( NULL );
kevman 0:38ceb79fef03 69 #endif
kevman 0:38ceb79fef03 70
kevman 0:38ceb79fef03 71 if( ( ret = ctx->f_rng( ctx->p_rng, key->name, sizeof( key->name ) ) ) != 0 )
kevman 0:38ceb79fef03 72 return( ret );
kevman 0:38ceb79fef03 73
kevman 0:38ceb79fef03 74 if( ( ret = ctx->f_rng( ctx->p_rng, buf, sizeof( buf ) ) ) != 0 )
kevman 0:38ceb79fef03 75 return( ret );
kevman 0:38ceb79fef03 76
kevman 0:38ceb79fef03 77 /* With GCM and CCM, same context can encrypt & decrypt */
kevman 0:38ceb79fef03 78 ret = mbedtls_cipher_setkey( &key->ctx, buf,
kevman 0:38ceb79fef03 79 mbedtls_cipher_get_key_bitlen( &key->ctx ),
kevman 0:38ceb79fef03 80 MBEDTLS_ENCRYPT );
kevman 0:38ceb79fef03 81
kevman 0:38ceb79fef03 82 mbedtls_platform_zeroize( buf, sizeof( buf ) );
kevman 0:38ceb79fef03 83
kevman 0:38ceb79fef03 84 return( ret );
kevman 0:38ceb79fef03 85 }
kevman 0:38ceb79fef03 86
kevman 0:38ceb79fef03 87 /*
kevman 0:38ceb79fef03 88 * Rotate/generate keys if necessary
kevman 0:38ceb79fef03 89 */
kevman 0:38ceb79fef03 90 static int ssl_ticket_update_keys( mbedtls_ssl_ticket_context *ctx )
kevman 0:38ceb79fef03 91 {
kevman 0:38ceb79fef03 92 #if !defined(MBEDTLS_HAVE_TIME)
kevman 0:38ceb79fef03 93 ((void) ctx);
kevman 0:38ceb79fef03 94 #else
kevman 0:38ceb79fef03 95 if( ctx->ticket_lifetime != 0 )
kevman 0:38ceb79fef03 96 {
kevman 0:38ceb79fef03 97 uint32_t current_time = (uint32_t) mbedtls_time( NULL );
kevman 0:38ceb79fef03 98 uint32_t key_time = ctx->keys[ctx->active].generation_time;
kevman 0:38ceb79fef03 99
kevman 0:38ceb79fef03 100 if( current_time > key_time &&
kevman 0:38ceb79fef03 101 current_time - key_time < ctx->ticket_lifetime )
kevman 0:38ceb79fef03 102 {
kevman 0:38ceb79fef03 103 return( 0 );
kevman 0:38ceb79fef03 104 }
kevman 0:38ceb79fef03 105
kevman 0:38ceb79fef03 106 ctx->active = 1 - ctx->active;
kevman 0:38ceb79fef03 107
kevman 0:38ceb79fef03 108 return( ssl_ticket_gen_key( ctx, ctx->active ) );
kevman 0:38ceb79fef03 109 }
kevman 0:38ceb79fef03 110 else
kevman 0:38ceb79fef03 111 #endif /* MBEDTLS_HAVE_TIME */
kevman 0:38ceb79fef03 112 return( 0 );
kevman 0:38ceb79fef03 113 }
kevman 0:38ceb79fef03 114
kevman 0:38ceb79fef03 115 /*
kevman 0:38ceb79fef03 116 * Setup context for actual use
kevman 0:38ceb79fef03 117 */
kevman 0:38ceb79fef03 118 int mbedtls_ssl_ticket_setup( mbedtls_ssl_ticket_context *ctx,
kevman 0:38ceb79fef03 119 int (*f_rng)(void *, unsigned char *, size_t), void *p_rng,
kevman 0:38ceb79fef03 120 mbedtls_cipher_type_t cipher,
kevman 0:38ceb79fef03 121 uint32_t lifetime )
kevman 0:38ceb79fef03 122 {
kevman 0:38ceb79fef03 123 int ret;
kevman 0:38ceb79fef03 124 const mbedtls_cipher_info_t *cipher_info;
kevman 0:38ceb79fef03 125
kevman 0:38ceb79fef03 126 ctx->f_rng = f_rng;
kevman 0:38ceb79fef03 127 ctx->p_rng = p_rng;
kevman 0:38ceb79fef03 128
kevman 0:38ceb79fef03 129 ctx->ticket_lifetime = lifetime;
kevman 0:38ceb79fef03 130
kevman 0:38ceb79fef03 131 cipher_info = mbedtls_cipher_info_from_type( cipher);
kevman 0:38ceb79fef03 132 if( cipher_info == NULL )
kevman 0:38ceb79fef03 133 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
kevman 0:38ceb79fef03 134
kevman 0:38ceb79fef03 135 if( cipher_info->mode != MBEDTLS_MODE_GCM &&
kevman 0:38ceb79fef03 136 cipher_info->mode != MBEDTLS_MODE_CCM )
kevman 0:38ceb79fef03 137 {
kevman 0:38ceb79fef03 138 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
kevman 0:38ceb79fef03 139 }
kevman 0:38ceb79fef03 140
kevman 0:38ceb79fef03 141 if( cipher_info->key_bitlen > 8 * MAX_KEY_BYTES )
kevman 0:38ceb79fef03 142 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
kevman 0:38ceb79fef03 143
kevman 0:38ceb79fef03 144 if( ( ret = mbedtls_cipher_setup( &ctx->keys[0].ctx, cipher_info ) ) != 0 ||
kevman 0:38ceb79fef03 145 ( ret = mbedtls_cipher_setup( &ctx->keys[1].ctx, cipher_info ) ) != 0 )
kevman 0:38ceb79fef03 146 {
kevman 0:38ceb79fef03 147 return( ret );
kevman 0:38ceb79fef03 148 }
kevman 0:38ceb79fef03 149
kevman 0:38ceb79fef03 150 if( ( ret = ssl_ticket_gen_key( ctx, 0 ) ) != 0 ||
kevman 0:38ceb79fef03 151 ( ret = ssl_ticket_gen_key( ctx, 1 ) ) != 0 )
kevman 0:38ceb79fef03 152 {
kevman 0:38ceb79fef03 153 return( ret );
kevman 0:38ceb79fef03 154 }
kevman 0:38ceb79fef03 155
kevman 0:38ceb79fef03 156 return( 0 );
kevman 0:38ceb79fef03 157 }
kevman 0:38ceb79fef03 158
kevman 0:38ceb79fef03 159 /*
kevman 0:38ceb79fef03 160 * Serialize a session in the following format:
kevman 0:38ceb79fef03 161 * 0 . n-1 session structure, n = sizeof(mbedtls_ssl_session)
kevman 0:38ceb79fef03 162 * n . n+2 peer_cert length = m (0 if no certificate)
kevman 0:38ceb79fef03 163 * n+3 . n+2+m peer cert ASN.1
kevman 0:38ceb79fef03 164 */
kevman 0:38ceb79fef03 165 static int ssl_save_session( const mbedtls_ssl_session *session,
kevman 0:38ceb79fef03 166 unsigned char *buf, size_t buf_len,
kevman 0:38ceb79fef03 167 size_t *olen )
kevman 0:38ceb79fef03 168 {
kevman 0:38ceb79fef03 169 unsigned char *p = buf;
kevman 0:38ceb79fef03 170 size_t left = buf_len;
kevman 0:38ceb79fef03 171 #if defined(MBEDTLS_X509_CRT_PARSE_C)
kevman 0:38ceb79fef03 172 size_t cert_len;
kevman 0:38ceb79fef03 173 #endif /* MBEDTLS_X509_CRT_PARSE_C */
kevman 0:38ceb79fef03 174
kevman 0:38ceb79fef03 175 if( left < sizeof( mbedtls_ssl_session ) )
kevman 0:38ceb79fef03 176 return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
kevman 0:38ceb79fef03 177
kevman 0:38ceb79fef03 178 memcpy( p, session, sizeof( mbedtls_ssl_session ) );
kevman 0:38ceb79fef03 179 p += sizeof( mbedtls_ssl_session );
kevman 0:38ceb79fef03 180 left -= sizeof( mbedtls_ssl_session );
kevman 0:38ceb79fef03 181
kevman 0:38ceb79fef03 182 #if defined(MBEDTLS_X509_CRT_PARSE_C)
kevman 0:38ceb79fef03 183 if( session->peer_cert == NULL )
kevman 0:38ceb79fef03 184 cert_len = 0;
kevman 0:38ceb79fef03 185 else
kevman 0:38ceb79fef03 186 cert_len = session->peer_cert->raw.len;
kevman 0:38ceb79fef03 187
kevman 0:38ceb79fef03 188 if( left < 3 + cert_len )
kevman 0:38ceb79fef03 189 return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
kevman 0:38ceb79fef03 190
kevman 0:38ceb79fef03 191 *p++ = (unsigned char)( cert_len >> 16 & 0xFF );
kevman 0:38ceb79fef03 192 *p++ = (unsigned char)( cert_len >> 8 & 0xFF );
kevman 0:38ceb79fef03 193 *p++ = (unsigned char)( cert_len & 0xFF );
kevman 0:38ceb79fef03 194
kevman 0:38ceb79fef03 195 if( session->peer_cert != NULL )
kevman 0:38ceb79fef03 196 memcpy( p, session->peer_cert->raw.p, cert_len );
kevman 0:38ceb79fef03 197
kevman 0:38ceb79fef03 198 p += cert_len;
kevman 0:38ceb79fef03 199 #endif /* MBEDTLS_X509_CRT_PARSE_C */
kevman 0:38ceb79fef03 200
kevman 0:38ceb79fef03 201 *olen = p - buf;
kevman 0:38ceb79fef03 202
kevman 0:38ceb79fef03 203 return( 0 );
kevman 0:38ceb79fef03 204 }
kevman 0:38ceb79fef03 205
kevman 0:38ceb79fef03 206 /*
kevman 0:38ceb79fef03 207 * Unserialise session, see ssl_save_session()
kevman 0:38ceb79fef03 208 */
kevman 0:38ceb79fef03 209 static int ssl_load_session( mbedtls_ssl_session *session,
kevman 0:38ceb79fef03 210 const unsigned char *buf, size_t len )
kevman 0:38ceb79fef03 211 {
kevman 0:38ceb79fef03 212 const unsigned char *p = buf;
kevman 0:38ceb79fef03 213 const unsigned char * const end = buf + len;
kevman 0:38ceb79fef03 214 #if defined(MBEDTLS_X509_CRT_PARSE_C)
kevman 0:38ceb79fef03 215 size_t cert_len;
kevman 0:38ceb79fef03 216 #endif /* MBEDTLS_X509_CRT_PARSE_C */
kevman 0:38ceb79fef03 217
kevman 0:38ceb79fef03 218 if( p + sizeof( mbedtls_ssl_session ) > end )
kevman 0:38ceb79fef03 219 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
kevman 0:38ceb79fef03 220
kevman 0:38ceb79fef03 221 memcpy( session, p, sizeof( mbedtls_ssl_session ) );
kevman 0:38ceb79fef03 222 p += sizeof( mbedtls_ssl_session );
kevman 0:38ceb79fef03 223
kevman 0:38ceb79fef03 224 #if defined(MBEDTLS_X509_CRT_PARSE_C)
kevman 0:38ceb79fef03 225 if( p + 3 > end )
kevman 0:38ceb79fef03 226 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
kevman 0:38ceb79fef03 227
kevman 0:38ceb79fef03 228 cert_len = ( p[0] << 16 ) | ( p[1] << 8 ) | p[2];
kevman 0:38ceb79fef03 229 p += 3;
kevman 0:38ceb79fef03 230
kevman 0:38ceb79fef03 231 if( cert_len == 0 )
kevman 0:38ceb79fef03 232 {
kevman 0:38ceb79fef03 233 session->peer_cert = NULL;
kevman 0:38ceb79fef03 234 }
kevman 0:38ceb79fef03 235 else
kevman 0:38ceb79fef03 236 {
kevman 0:38ceb79fef03 237 int ret;
kevman 0:38ceb79fef03 238
kevman 0:38ceb79fef03 239 if( p + cert_len > end )
kevman 0:38ceb79fef03 240 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
kevman 0:38ceb79fef03 241
kevman 0:38ceb79fef03 242 session->peer_cert = mbedtls_calloc( 1, sizeof( mbedtls_x509_crt ) );
kevman 0:38ceb79fef03 243
kevman 0:38ceb79fef03 244 if( session->peer_cert == NULL )
kevman 0:38ceb79fef03 245 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
kevman 0:38ceb79fef03 246
kevman 0:38ceb79fef03 247 mbedtls_x509_crt_init( session->peer_cert );
kevman 0:38ceb79fef03 248
kevman 0:38ceb79fef03 249 if( ( ret = mbedtls_x509_crt_parse_der( session->peer_cert,
kevman 0:38ceb79fef03 250 p, cert_len ) ) != 0 )
kevman 0:38ceb79fef03 251 {
kevman 0:38ceb79fef03 252 mbedtls_x509_crt_free( session->peer_cert );
kevman 0:38ceb79fef03 253 mbedtls_free( session->peer_cert );
kevman 0:38ceb79fef03 254 session->peer_cert = NULL;
kevman 0:38ceb79fef03 255 return( ret );
kevman 0:38ceb79fef03 256 }
kevman 0:38ceb79fef03 257
kevman 0:38ceb79fef03 258 p += cert_len;
kevman 0:38ceb79fef03 259 }
kevman 0:38ceb79fef03 260 #endif /* MBEDTLS_X509_CRT_PARSE_C */
kevman 0:38ceb79fef03 261
kevman 0:38ceb79fef03 262 if( p != end )
kevman 0:38ceb79fef03 263 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
kevman 0:38ceb79fef03 264
kevman 0:38ceb79fef03 265 return( 0 );
kevman 0:38ceb79fef03 266 }
kevman 0:38ceb79fef03 267
kevman 0:38ceb79fef03 268 /*
kevman 0:38ceb79fef03 269 * Create session ticket, with the following structure:
kevman 0:38ceb79fef03 270 *
kevman 0:38ceb79fef03 271 * struct {
kevman 0:38ceb79fef03 272 * opaque key_name[4];
kevman 0:38ceb79fef03 273 * opaque iv[12];
kevman 0:38ceb79fef03 274 * opaque encrypted_state<0..2^16-1>;
kevman 0:38ceb79fef03 275 * opaque tag[16];
kevman 0:38ceb79fef03 276 * } ticket;
kevman 0:38ceb79fef03 277 *
kevman 0:38ceb79fef03 278 * The key_name, iv, and length of encrypted_state are the additional
kevman 0:38ceb79fef03 279 * authenticated data.
kevman 0:38ceb79fef03 280 */
kevman 0:38ceb79fef03 281 int mbedtls_ssl_ticket_write( void *p_ticket,
kevman 0:38ceb79fef03 282 const mbedtls_ssl_session *session,
kevman 0:38ceb79fef03 283 unsigned char *start,
kevman 0:38ceb79fef03 284 const unsigned char *end,
kevman 0:38ceb79fef03 285 size_t *tlen,
kevman 0:38ceb79fef03 286 uint32_t *ticket_lifetime )
kevman 0:38ceb79fef03 287 {
kevman 0:38ceb79fef03 288 int ret;
kevman 0:38ceb79fef03 289 mbedtls_ssl_ticket_context *ctx = p_ticket;
kevman 0:38ceb79fef03 290 mbedtls_ssl_ticket_key *key;
kevman 0:38ceb79fef03 291 unsigned char *key_name = start;
kevman 0:38ceb79fef03 292 unsigned char *iv = start + 4;
kevman 0:38ceb79fef03 293 unsigned char *state_len_bytes = iv + 12;
kevman 0:38ceb79fef03 294 unsigned char *state = state_len_bytes + 2;
kevman 0:38ceb79fef03 295 unsigned char *tag;
kevman 0:38ceb79fef03 296 size_t clear_len, ciph_len;
kevman 0:38ceb79fef03 297
kevman 0:38ceb79fef03 298 *tlen = 0;
kevman 0:38ceb79fef03 299
kevman 0:38ceb79fef03 300 if( ctx == NULL || ctx->f_rng == NULL )
kevman 0:38ceb79fef03 301 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
kevman 0:38ceb79fef03 302
kevman 0:38ceb79fef03 303 /* We need at least 4 bytes for key_name, 12 for IV, 2 for len 16 for tag,
kevman 0:38ceb79fef03 304 * in addition to session itself, that will be checked when writing it. */
kevman 0:38ceb79fef03 305 if( end - start < 4 + 12 + 2 + 16 )
kevman 0:38ceb79fef03 306 return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
kevman 0:38ceb79fef03 307
kevman 0:38ceb79fef03 308 #if defined(MBEDTLS_THREADING_C)
kevman 0:38ceb79fef03 309 if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
kevman 0:38ceb79fef03 310 return( ret );
kevman 0:38ceb79fef03 311 #endif
kevman 0:38ceb79fef03 312
kevman 0:38ceb79fef03 313 if( ( ret = ssl_ticket_update_keys( ctx ) ) != 0 )
kevman 0:38ceb79fef03 314 goto cleanup;
kevman 0:38ceb79fef03 315
kevman 0:38ceb79fef03 316 key = &ctx->keys[ctx->active];
kevman 0:38ceb79fef03 317
kevman 0:38ceb79fef03 318 *ticket_lifetime = ctx->ticket_lifetime;
kevman 0:38ceb79fef03 319
kevman 0:38ceb79fef03 320 memcpy( key_name, key->name, 4 );
kevman 0:38ceb79fef03 321
kevman 0:38ceb79fef03 322 if( ( ret = ctx->f_rng( ctx->p_rng, iv, 12 ) ) != 0 )
kevman 0:38ceb79fef03 323 goto cleanup;
kevman 0:38ceb79fef03 324
kevman 0:38ceb79fef03 325 /* Dump session state */
kevman 0:38ceb79fef03 326 if( ( ret = ssl_save_session( session,
kevman 0:38ceb79fef03 327 state, end - state, &clear_len ) ) != 0 ||
kevman 0:38ceb79fef03 328 (unsigned long) clear_len > 65535 )
kevman 0:38ceb79fef03 329 {
kevman 0:38ceb79fef03 330 goto cleanup;
kevman 0:38ceb79fef03 331 }
kevman 0:38ceb79fef03 332 state_len_bytes[0] = ( clear_len >> 8 ) & 0xff;
kevman 0:38ceb79fef03 333 state_len_bytes[1] = ( clear_len ) & 0xff;
kevman 0:38ceb79fef03 334
kevman 0:38ceb79fef03 335 /* Encrypt and authenticate */
kevman 0:38ceb79fef03 336 tag = state + clear_len;
kevman 0:38ceb79fef03 337 if( ( ret = mbedtls_cipher_auth_encrypt( &key->ctx,
kevman 0:38ceb79fef03 338 iv, 12, key_name, 4 + 12 + 2,
kevman 0:38ceb79fef03 339 state, clear_len, state, &ciph_len, tag, 16 ) ) != 0 )
kevman 0:38ceb79fef03 340 {
kevman 0:38ceb79fef03 341 goto cleanup;
kevman 0:38ceb79fef03 342 }
kevman 0:38ceb79fef03 343 if( ciph_len != clear_len )
kevman 0:38ceb79fef03 344 {
kevman 0:38ceb79fef03 345 ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR;
kevman 0:38ceb79fef03 346 goto cleanup;
kevman 0:38ceb79fef03 347 }
kevman 0:38ceb79fef03 348
kevman 0:38ceb79fef03 349 *tlen = 4 + 12 + 2 + 16 + ciph_len;
kevman 0:38ceb79fef03 350
kevman 0:38ceb79fef03 351 cleanup:
kevman 0:38ceb79fef03 352 #if defined(MBEDTLS_THREADING_C)
kevman 0:38ceb79fef03 353 if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
kevman 0:38ceb79fef03 354 return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
kevman 0:38ceb79fef03 355 #endif
kevman 0:38ceb79fef03 356
kevman 0:38ceb79fef03 357 return( ret );
kevman 0:38ceb79fef03 358 }
kevman 0:38ceb79fef03 359
kevman 0:38ceb79fef03 360 /*
kevman 0:38ceb79fef03 361 * Select key based on name
kevman 0:38ceb79fef03 362 */
kevman 0:38ceb79fef03 363 static mbedtls_ssl_ticket_key *ssl_ticket_select_key(
kevman 0:38ceb79fef03 364 mbedtls_ssl_ticket_context *ctx,
kevman 0:38ceb79fef03 365 const unsigned char name[4] )
kevman 0:38ceb79fef03 366 {
kevman 0:38ceb79fef03 367 unsigned char i;
kevman 0:38ceb79fef03 368
kevman 0:38ceb79fef03 369 for( i = 0; i < sizeof( ctx->keys ) / sizeof( *ctx->keys ); i++ )
kevman 0:38ceb79fef03 370 if( memcmp( name, ctx->keys[i].name, 4 ) == 0 )
kevman 0:38ceb79fef03 371 return( &ctx->keys[i] );
kevman 0:38ceb79fef03 372
kevman 0:38ceb79fef03 373 return( NULL );
kevman 0:38ceb79fef03 374 }
kevman 0:38ceb79fef03 375
kevman 0:38ceb79fef03 376 /*
kevman 0:38ceb79fef03 377 * Load session ticket (see mbedtls_ssl_ticket_write for structure)
kevman 0:38ceb79fef03 378 */
kevman 0:38ceb79fef03 379 int mbedtls_ssl_ticket_parse( void *p_ticket,
kevman 0:38ceb79fef03 380 mbedtls_ssl_session *session,
kevman 0:38ceb79fef03 381 unsigned char *buf,
kevman 0:38ceb79fef03 382 size_t len )
kevman 0:38ceb79fef03 383 {
kevman 0:38ceb79fef03 384 int ret;
kevman 0:38ceb79fef03 385 mbedtls_ssl_ticket_context *ctx = p_ticket;
kevman 0:38ceb79fef03 386 mbedtls_ssl_ticket_key *key;
kevman 0:38ceb79fef03 387 unsigned char *key_name = buf;
kevman 0:38ceb79fef03 388 unsigned char *iv = buf + 4;
kevman 0:38ceb79fef03 389 unsigned char *enc_len_p = iv + 12;
kevman 0:38ceb79fef03 390 unsigned char *ticket = enc_len_p + 2;
kevman 0:38ceb79fef03 391 unsigned char *tag;
kevman 0:38ceb79fef03 392 size_t enc_len, clear_len;
kevman 0:38ceb79fef03 393
kevman 0:38ceb79fef03 394 if( ctx == NULL || ctx->f_rng == NULL )
kevman 0:38ceb79fef03 395 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
kevman 0:38ceb79fef03 396
kevman 0:38ceb79fef03 397 /* See mbedtls_ssl_ticket_write() */
kevman 0:38ceb79fef03 398 if( len < 4 + 12 + 2 + 16 )
kevman 0:38ceb79fef03 399 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
kevman 0:38ceb79fef03 400
kevman 0:38ceb79fef03 401 #if defined(MBEDTLS_THREADING_C)
kevman 0:38ceb79fef03 402 if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
kevman 0:38ceb79fef03 403 return( ret );
kevman 0:38ceb79fef03 404 #endif
kevman 0:38ceb79fef03 405
kevman 0:38ceb79fef03 406 if( ( ret = ssl_ticket_update_keys( ctx ) ) != 0 )
kevman 0:38ceb79fef03 407 goto cleanup;
kevman 0:38ceb79fef03 408
kevman 0:38ceb79fef03 409 enc_len = ( enc_len_p[0] << 8 ) | enc_len_p[1];
kevman 0:38ceb79fef03 410 tag = ticket + enc_len;
kevman 0:38ceb79fef03 411
kevman 0:38ceb79fef03 412 if( len != 4 + 12 + 2 + enc_len + 16 )
kevman 0:38ceb79fef03 413 {
kevman 0:38ceb79fef03 414 ret = MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
kevman 0:38ceb79fef03 415 goto cleanup;
kevman 0:38ceb79fef03 416 }
kevman 0:38ceb79fef03 417
kevman 0:38ceb79fef03 418 /* Select key */
kevman 0:38ceb79fef03 419 if( ( key = ssl_ticket_select_key( ctx, key_name ) ) == NULL )
kevman 0:38ceb79fef03 420 {
kevman 0:38ceb79fef03 421 /* We can't know for sure but this is a likely option unless we're
kevman 0:38ceb79fef03 422 * under attack - this is only informative anyway */
kevman 0:38ceb79fef03 423 ret = MBEDTLS_ERR_SSL_SESSION_TICKET_EXPIRED;
kevman 0:38ceb79fef03 424 goto cleanup;
kevman 0:38ceb79fef03 425 }
kevman 0:38ceb79fef03 426
kevman 0:38ceb79fef03 427 /* Decrypt and authenticate */
kevman 0:38ceb79fef03 428 if( ( ret = mbedtls_cipher_auth_decrypt( &key->ctx, iv, 12,
kevman 0:38ceb79fef03 429 key_name, 4 + 12 + 2, ticket, enc_len,
kevman 0:38ceb79fef03 430 ticket, &clear_len, tag, 16 ) ) != 0 )
kevman 0:38ceb79fef03 431 {
kevman 0:38ceb79fef03 432 if( ret == MBEDTLS_ERR_CIPHER_AUTH_FAILED )
kevman 0:38ceb79fef03 433 ret = MBEDTLS_ERR_SSL_INVALID_MAC;
kevman 0:38ceb79fef03 434
kevman 0:38ceb79fef03 435 goto cleanup;
kevman 0:38ceb79fef03 436 }
kevman 0:38ceb79fef03 437 if( clear_len != enc_len )
kevman 0:38ceb79fef03 438 {
kevman 0:38ceb79fef03 439 ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR;
kevman 0:38ceb79fef03 440 goto cleanup;
kevman 0:38ceb79fef03 441 }
kevman 0:38ceb79fef03 442
kevman 0:38ceb79fef03 443 /* Actually load session */
kevman 0:38ceb79fef03 444 if( ( ret = ssl_load_session( session, ticket, clear_len ) ) != 0 )
kevman 0:38ceb79fef03 445 goto cleanup;
kevman 0:38ceb79fef03 446
kevman 0:38ceb79fef03 447 #if defined(MBEDTLS_HAVE_TIME)
kevman 0:38ceb79fef03 448 {
kevman 0:38ceb79fef03 449 /* Check for expiration */
kevman 0:38ceb79fef03 450 mbedtls_time_t current_time = mbedtls_time( NULL );
kevman 0:38ceb79fef03 451
kevman 0:38ceb79fef03 452 if( current_time < session->start ||
kevman 0:38ceb79fef03 453 (uint32_t)( current_time - session->start ) > ctx->ticket_lifetime )
kevman 0:38ceb79fef03 454 {
kevman 0:38ceb79fef03 455 ret = MBEDTLS_ERR_SSL_SESSION_TICKET_EXPIRED;
kevman 0:38ceb79fef03 456 goto cleanup;
kevman 0:38ceb79fef03 457 }
kevman 0:38ceb79fef03 458 }
kevman 0:38ceb79fef03 459 #endif
kevman 0:38ceb79fef03 460
kevman 0:38ceb79fef03 461 cleanup:
kevman 0:38ceb79fef03 462 #if defined(MBEDTLS_THREADING_C)
kevman 0:38ceb79fef03 463 if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
kevman 0:38ceb79fef03 464 return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
kevman 0:38ceb79fef03 465 #endif
kevman 0:38ceb79fef03 466
kevman 0:38ceb79fef03 467 return( ret );
kevman 0:38ceb79fef03 468 }
kevman 0:38ceb79fef03 469
kevman 0:38ceb79fef03 470 /*
kevman 0:38ceb79fef03 471 * Free context
kevman 0:38ceb79fef03 472 */
kevman 0:38ceb79fef03 473 void mbedtls_ssl_ticket_free( mbedtls_ssl_ticket_context *ctx )
kevman 0:38ceb79fef03 474 {
kevman 0:38ceb79fef03 475 mbedtls_cipher_free( &ctx->keys[0].ctx );
kevman 0:38ceb79fef03 476 mbedtls_cipher_free( &ctx->keys[1].ctx );
kevman 0:38ceb79fef03 477
kevman 0:38ceb79fef03 478 #if defined(MBEDTLS_THREADING_C)
kevman 0:38ceb79fef03 479 mbedtls_mutex_free( &ctx->mutex );
kevman 0:38ceb79fef03 480 #endif
kevman 0:38ceb79fef03 481
kevman 0:38ceb79fef03 482 mbedtls_platform_zeroize( ctx, sizeof( mbedtls_ssl_ticket_context ) );
kevman 0:38ceb79fef03 483 }
kevman 0:38ceb79fef03 484
kevman 0:38ceb79fef03 485 #endif /* MBEDTLS_SSL_TICKET_C */