Denislam Valeev / Mbed OS Nucleo_rtos_basic

Important changes to repositories hosted on mbed.com

Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.

To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.

It is also possible to export all your personal repositories from the account settings page.

mbed-os/features/mbedtls/src/ssl_ticket.c@0:e056ac8fecf8, 2018-03-13 (annotated)

Committer:
valeyev
Date:
Tue Mar 13 07:17:50 2018 +0000
Revision:
0:e056ac8fecf8
looking for...

Who changed what in which revision?

UserRevisionLine numberNew contents of line
valeyev 0:e056ac8fecf8 1 /*
valeyev 0:e056ac8fecf8 2 * TLS server tickets callbacks implementation
valeyev 0:e056ac8fecf8 3 *
valeyev 0:e056ac8fecf8 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
valeyev 0:e056ac8fecf8 5 * SPDX-License-Identifier: Apache-2.0
valeyev 0:e056ac8fecf8 6 *
valeyev 0:e056ac8fecf8 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
valeyev 0:e056ac8fecf8 8 * not use this file except in compliance with the License.
valeyev 0:e056ac8fecf8 9 * You may obtain a copy of the License at
valeyev 0:e056ac8fecf8 10 *
valeyev 0:e056ac8fecf8 11 * http://www.apache.org/licenses/LICENSE-2.0
valeyev 0:e056ac8fecf8 12 *
valeyev 0:e056ac8fecf8 13 * Unless required by applicable law or agreed to in writing, software
valeyev 0:e056ac8fecf8 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
valeyev 0:e056ac8fecf8 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
valeyev 0:e056ac8fecf8 16 * See the License for the specific language governing permissions and
valeyev 0:e056ac8fecf8 17 * limitations under the License.
valeyev 0:e056ac8fecf8 18 *
valeyev 0:e056ac8fecf8 19 * This file is part of mbed TLS (https://tls.mbed.org)
valeyev 0:e056ac8fecf8 20 */
valeyev 0:e056ac8fecf8 21
valeyev 0:e056ac8fecf8 22 #if !defined(MBEDTLS_CONFIG_FILE)
valeyev 0:e056ac8fecf8 23 #include "mbedtls/config.h"
valeyev 0:e056ac8fecf8 24 #else
valeyev 0:e056ac8fecf8 25 #include MBEDTLS_CONFIG_FILE
valeyev 0:e056ac8fecf8 26 #endif
valeyev 0:e056ac8fecf8 27
valeyev 0:e056ac8fecf8 28 #if defined(MBEDTLS_SSL_TICKET_C)
valeyev 0:e056ac8fecf8 29
valeyev 0:e056ac8fecf8 30 #if defined(MBEDTLS_PLATFORM_C)
valeyev 0:e056ac8fecf8 31 #include "mbedtls/platform.h"
valeyev 0:e056ac8fecf8 32 #else
valeyev 0:e056ac8fecf8 33 #include <stdlib.h>
valeyev 0:e056ac8fecf8 34 #define mbedtls_calloc calloc
valeyev 0:e056ac8fecf8 35 #define mbedtls_free free
valeyev 0:e056ac8fecf8 36 #endif
valeyev 0:e056ac8fecf8 37
valeyev 0:e056ac8fecf8 38 #include "mbedtls/ssl_ticket.h"
valeyev 0:e056ac8fecf8 39
valeyev 0:e056ac8fecf8 40 #include <string.h>
valeyev 0:e056ac8fecf8 41
valeyev 0:e056ac8fecf8 42 /* Implementation that should never be optimized out by the compiler */
valeyev 0:e056ac8fecf8 43 static void mbedtls_zeroize( void *v, size_t n ) {
valeyev 0:e056ac8fecf8 44 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
valeyev 0:e056ac8fecf8 45 }
valeyev 0:e056ac8fecf8 46
valeyev 0:e056ac8fecf8 47 /*
valeyev 0:e056ac8fecf8 48 * Initialze context
valeyev 0:e056ac8fecf8 49 */
valeyev 0:e056ac8fecf8 50 void mbedtls_ssl_ticket_init( mbedtls_ssl_ticket_context *ctx )
valeyev 0:e056ac8fecf8 51 {
valeyev 0:e056ac8fecf8 52 memset( ctx, 0, sizeof( mbedtls_ssl_ticket_context ) );
valeyev 0:e056ac8fecf8 53
valeyev 0:e056ac8fecf8 54 #if defined(MBEDTLS_THREADING_C)
valeyev 0:e056ac8fecf8 55 mbedtls_mutex_init( &ctx->mutex );
valeyev 0:e056ac8fecf8 56 #endif
valeyev 0:e056ac8fecf8 57 }
valeyev 0:e056ac8fecf8 58
valeyev 0:e056ac8fecf8 59 #define MAX_KEY_BYTES 32 /* 256 bits */
valeyev 0:e056ac8fecf8 60
valeyev 0:e056ac8fecf8 61 /*
valeyev 0:e056ac8fecf8 62 * Generate/update a key
valeyev 0:e056ac8fecf8 63 */
valeyev 0:e056ac8fecf8 64 static int ssl_ticket_gen_key( mbedtls_ssl_ticket_context *ctx,
valeyev 0:e056ac8fecf8 65 unsigned char index )
valeyev 0:e056ac8fecf8 66 {
valeyev 0:e056ac8fecf8 67 int ret;
valeyev 0:e056ac8fecf8 68 unsigned char buf[MAX_KEY_BYTES];
valeyev 0:e056ac8fecf8 69 mbedtls_ssl_ticket_key *key = ctx->keys + index;
valeyev 0:e056ac8fecf8 70
valeyev 0:e056ac8fecf8 71 #if defined(MBEDTLS_HAVE_TIME)
valeyev 0:e056ac8fecf8 72 key->generation_time = (uint32_t) mbedtls_time( NULL );
valeyev 0:e056ac8fecf8 73 #endif
valeyev 0:e056ac8fecf8 74
valeyev 0:e056ac8fecf8 75 if( ( ret = ctx->f_rng( ctx->p_rng, key->name, sizeof( key->name ) ) ) != 0 )
valeyev 0:e056ac8fecf8 76 return( ret );
valeyev 0:e056ac8fecf8 77
valeyev 0:e056ac8fecf8 78 if( ( ret = ctx->f_rng( ctx->p_rng, buf, sizeof( buf ) ) ) != 0 )
valeyev 0:e056ac8fecf8 79 return( ret );
valeyev 0:e056ac8fecf8 80
valeyev 0:e056ac8fecf8 81 /* With GCM and CCM, same context can encrypt & decrypt */
valeyev 0:e056ac8fecf8 82 ret = mbedtls_cipher_setkey( &key->ctx, buf,
valeyev 0:e056ac8fecf8 83 mbedtls_cipher_get_key_bitlen( &key->ctx ),
valeyev 0:e056ac8fecf8 84 MBEDTLS_ENCRYPT );
valeyev 0:e056ac8fecf8 85
valeyev 0:e056ac8fecf8 86 mbedtls_zeroize( buf, sizeof( buf ) );
valeyev 0:e056ac8fecf8 87
valeyev 0:e056ac8fecf8 88 return( ret );
valeyev 0:e056ac8fecf8 89 }
valeyev 0:e056ac8fecf8 90
valeyev 0:e056ac8fecf8 91 /*
valeyev 0:e056ac8fecf8 92 * Rotate/generate keys if necessary
valeyev 0:e056ac8fecf8 93 */
valeyev 0:e056ac8fecf8 94 static int ssl_ticket_update_keys( mbedtls_ssl_ticket_context *ctx )
valeyev 0:e056ac8fecf8 95 {
valeyev 0:e056ac8fecf8 96 #if !defined(MBEDTLS_HAVE_TIME)
valeyev 0:e056ac8fecf8 97 ((void) ctx);
valeyev 0:e056ac8fecf8 98 #else
valeyev 0:e056ac8fecf8 99 if( ctx->ticket_lifetime != 0 )
valeyev 0:e056ac8fecf8 100 {
valeyev 0:e056ac8fecf8 101 uint32_t current_time = (uint32_t) mbedtls_time( NULL );
valeyev 0:e056ac8fecf8 102 uint32_t key_time = ctx->keys[ctx->active].generation_time;
valeyev 0:e056ac8fecf8 103
valeyev 0:e056ac8fecf8 104 if( current_time > key_time &&
valeyev 0:e056ac8fecf8 105 current_time - key_time < ctx->ticket_lifetime )
valeyev 0:e056ac8fecf8 106 {
valeyev 0:e056ac8fecf8 107 return( 0 );
valeyev 0:e056ac8fecf8 108 }
valeyev 0:e056ac8fecf8 109
valeyev 0:e056ac8fecf8 110 ctx->active = 1 - ctx->active;
valeyev 0:e056ac8fecf8 111
valeyev 0:e056ac8fecf8 112 return( ssl_ticket_gen_key( ctx, ctx->active ) );
valeyev 0:e056ac8fecf8 113 }
valeyev 0:e056ac8fecf8 114 else
valeyev 0:e056ac8fecf8 115 #endif /* MBEDTLS_HAVE_TIME */
valeyev 0:e056ac8fecf8 116 return( 0 );
valeyev 0:e056ac8fecf8 117 }
valeyev 0:e056ac8fecf8 118
valeyev 0:e056ac8fecf8 119 /*
valeyev 0:e056ac8fecf8 120 * Setup context for actual use
valeyev 0:e056ac8fecf8 121 */
valeyev 0:e056ac8fecf8 122 int mbedtls_ssl_ticket_setup( mbedtls_ssl_ticket_context *ctx,
valeyev 0:e056ac8fecf8 123 int (*f_rng)(void *, unsigned char *, size_t), void *p_rng,
valeyev 0:e056ac8fecf8 124 mbedtls_cipher_type_t cipher,
valeyev 0:e056ac8fecf8 125 uint32_t lifetime )
valeyev 0:e056ac8fecf8 126 {
valeyev 0:e056ac8fecf8 127 int ret;
valeyev 0:e056ac8fecf8 128 const mbedtls_cipher_info_t *cipher_info;
valeyev 0:e056ac8fecf8 129
valeyev 0:e056ac8fecf8 130 ctx->f_rng = f_rng;
valeyev 0:e056ac8fecf8 131 ctx->p_rng = p_rng;
valeyev 0:e056ac8fecf8 132
valeyev 0:e056ac8fecf8 133 ctx->ticket_lifetime = lifetime;
valeyev 0:e056ac8fecf8 134
valeyev 0:e056ac8fecf8 135 cipher_info = mbedtls_cipher_info_from_type( cipher);
valeyev 0:e056ac8fecf8 136 if( cipher_info == NULL )
valeyev 0:e056ac8fecf8 137 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
valeyev 0:e056ac8fecf8 138
valeyev 0:e056ac8fecf8 139 if( cipher_info->mode != MBEDTLS_MODE_GCM &&
valeyev 0:e056ac8fecf8 140 cipher_info->mode != MBEDTLS_MODE_CCM )
valeyev 0:e056ac8fecf8 141 {
valeyev 0:e056ac8fecf8 142 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
valeyev 0:e056ac8fecf8 143 }
valeyev 0:e056ac8fecf8 144
valeyev 0:e056ac8fecf8 145 if( cipher_info->key_bitlen > 8 * MAX_KEY_BYTES )
valeyev 0:e056ac8fecf8 146 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
valeyev 0:e056ac8fecf8 147
valeyev 0:e056ac8fecf8 148 if( ( ret = mbedtls_cipher_setup( &ctx->keys[0].ctx, cipher_info ) ) != 0 ||
valeyev 0:e056ac8fecf8 149 ( ret = mbedtls_cipher_setup( &ctx->keys[1].ctx, cipher_info ) ) != 0 )
valeyev 0:e056ac8fecf8 150 {
valeyev 0:e056ac8fecf8 151 return( ret );
valeyev 0:e056ac8fecf8 152 }
valeyev 0:e056ac8fecf8 153
valeyev 0:e056ac8fecf8 154 if( ( ret = ssl_ticket_gen_key( ctx, 0 ) ) != 0 ||
valeyev 0:e056ac8fecf8 155 ( ret = ssl_ticket_gen_key( ctx, 1 ) ) != 0 )
valeyev 0:e056ac8fecf8 156 {
valeyev 0:e056ac8fecf8 157 return( ret );
valeyev 0:e056ac8fecf8 158 }
valeyev 0:e056ac8fecf8 159
valeyev 0:e056ac8fecf8 160 return( 0 );
valeyev 0:e056ac8fecf8 161 }
valeyev 0:e056ac8fecf8 162
valeyev 0:e056ac8fecf8 163 /*
valeyev 0:e056ac8fecf8 164 * Serialize a session in the following format:
valeyev 0:e056ac8fecf8 165 * 0 . n-1 session structure, n = sizeof(mbedtls_ssl_session)
valeyev 0:e056ac8fecf8 166 * n . n+2 peer_cert length = m (0 if no certificate)
valeyev 0:e056ac8fecf8 167 * n+3 . n+2+m peer cert ASN.1
valeyev 0:e056ac8fecf8 168 */
valeyev 0:e056ac8fecf8 169 static int ssl_save_session( const mbedtls_ssl_session *session,
valeyev 0:e056ac8fecf8 170 unsigned char *buf, size_t buf_len,
valeyev 0:e056ac8fecf8 171 size_t *olen )
valeyev 0:e056ac8fecf8 172 {
valeyev 0:e056ac8fecf8 173 unsigned char *p = buf;
valeyev 0:e056ac8fecf8 174 size_t left = buf_len;
valeyev 0:e056ac8fecf8 175 #if defined(MBEDTLS_X509_CRT_PARSE_C)
valeyev 0:e056ac8fecf8 176 size_t cert_len;
valeyev 0:e056ac8fecf8 177 #endif /* MBEDTLS_X509_CRT_PARSE_C */
valeyev 0:e056ac8fecf8 178
valeyev 0:e056ac8fecf8 179 if( left < sizeof( mbedtls_ssl_session ) )
valeyev 0:e056ac8fecf8 180 return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
valeyev 0:e056ac8fecf8 181
valeyev 0:e056ac8fecf8 182 memcpy( p, session, sizeof( mbedtls_ssl_session ) );
valeyev 0:e056ac8fecf8 183 p += sizeof( mbedtls_ssl_session );
valeyev 0:e056ac8fecf8 184 left -= sizeof( mbedtls_ssl_session );
valeyev 0:e056ac8fecf8 185
valeyev 0:e056ac8fecf8 186 #if defined(MBEDTLS_X509_CRT_PARSE_C)
valeyev 0:e056ac8fecf8 187 if( session->peer_cert == NULL )
valeyev 0:e056ac8fecf8 188 cert_len = 0;
valeyev 0:e056ac8fecf8 189 else
valeyev 0:e056ac8fecf8 190 cert_len = session->peer_cert->raw.len;
valeyev 0:e056ac8fecf8 191
valeyev 0:e056ac8fecf8 192 if( left < 3 + cert_len )
valeyev 0:e056ac8fecf8 193 return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
valeyev 0:e056ac8fecf8 194
valeyev 0:e056ac8fecf8 195 *p++ = (unsigned char)( cert_len >> 16 & 0xFF );
valeyev 0:e056ac8fecf8 196 *p++ = (unsigned char)( cert_len >> 8 & 0xFF );
valeyev 0:e056ac8fecf8 197 *p++ = (unsigned char)( cert_len & 0xFF );
valeyev 0:e056ac8fecf8 198
valeyev 0:e056ac8fecf8 199 if( session->peer_cert != NULL )
valeyev 0:e056ac8fecf8 200 memcpy( p, session->peer_cert->raw.p, cert_len );
valeyev 0:e056ac8fecf8 201
valeyev 0:e056ac8fecf8 202 p += cert_len;
valeyev 0:e056ac8fecf8 203 #endif /* MBEDTLS_X509_CRT_PARSE_C */
valeyev 0:e056ac8fecf8 204
valeyev 0:e056ac8fecf8 205 *olen = p - buf;
valeyev 0:e056ac8fecf8 206
valeyev 0:e056ac8fecf8 207 return( 0 );
valeyev 0:e056ac8fecf8 208 }
valeyev 0:e056ac8fecf8 209
valeyev 0:e056ac8fecf8 210 /*
valeyev 0:e056ac8fecf8 211 * Unserialise session, see ssl_save_session()
valeyev 0:e056ac8fecf8 212 */
valeyev 0:e056ac8fecf8 213 static int ssl_load_session( mbedtls_ssl_session *session,
valeyev 0:e056ac8fecf8 214 const unsigned char *buf, size_t len )
valeyev 0:e056ac8fecf8 215 {
valeyev 0:e056ac8fecf8 216 const unsigned char *p = buf;
valeyev 0:e056ac8fecf8 217 const unsigned char * const end = buf + len;
valeyev 0:e056ac8fecf8 218 #if defined(MBEDTLS_X509_CRT_PARSE_C)
valeyev 0:e056ac8fecf8 219 size_t cert_len;
valeyev 0:e056ac8fecf8 220 #endif /* MBEDTLS_X509_CRT_PARSE_C */
valeyev 0:e056ac8fecf8 221
valeyev 0:e056ac8fecf8 222 if( p + sizeof( mbedtls_ssl_session ) > end )
valeyev 0:e056ac8fecf8 223 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
valeyev 0:e056ac8fecf8 224
valeyev 0:e056ac8fecf8 225 memcpy( session, p, sizeof( mbedtls_ssl_session ) );
valeyev 0:e056ac8fecf8 226 p += sizeof( mbedtls_ssl_session );
valeyev 0:e056ac8fecf8 227
valeyev 0:e056ac8fecf8 228 #if defined(MBEDTLS_X509_CRT_PARSE_C)
valeyev 0:e056ac8fecf8 229 if( p + 3 > end )
valeyev 0:e056ac8fecf8 230 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
valeyev 0:e056ac8fecf8 231
valeyev 0:e056ac8fecf8 232 cert_len = ( p[0] << 16 ) | ( p[1] << 8 ) | p[2];
valeyev 0:e056ac8fecf8 233 p += 3;
valeyev 0:e056ac8fecf8 234
valeyev 0:e056ac8fecf8 235 if( cert_len == 0 )
valeyev 0:e056ac8fecf8 236 {
valeyev 0:e056ac8fecf8 237 session->peer_cert = NULL;
valeyev 0:e056ac8fecf8 238 }
valeyev 0:e056ac8fecf8 239 else
valeyev 0:e056ac8fecf8 240 {
valeyev 0:e056ac8fecf8 241 int ret;
valeyev 0:e056ac8fecf8 242
valeyev 0:e056ac8fecf8 243 if( p + cert_len > end )
valeyev 0:e056ac8fecf8 244 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
valeyev 0:e056ac8fecf8 245
valeyev 0:e056ac8fecf8 246 session->peer_cert = mbedtls_calloc( 1, sizeof( mbedtls_x509_crt ) );
valeyev 0:e056ac8fecf8 247
valeyev 0:e056ac8fecf8 248 if( session->peer_cert == NULL )
valeyev 0:e056ac8fecf8 249 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
valeyev 0:e056ac8fecf8 250
valeyev 0:e056ac8fecf8 251 mbedtls_x509_crt_init( session->peer_cert );
valeyev 0:e056ac8fecf8 252
valeyev 0:e056ac8fecf8 253 if( ( ret = mbedtls_x509_crt_parse_der( session->peer_cert,
valeyev 0:e056ac8fecf8 254 p, cert_len ) ) != 0 )
valeyev 0:e056ac8fecf8 255 {
valeyev 0:e056ac8fecf8 256 mbedtls_x509_crt_free( session->peer_cert );
valeyev 0:e056ac8fecf8 257 mbedtls_free( session->peer_cert );
valeyev 0:e056ac8fecf8 258 session->peer_cert = NULL;
valeyev 0:e056ac8fecf8 259 return( ret );
valeyev 0:e056ac8fecf8 260 }
valeyev 0:e056ac8fecf8 261
valeyev 0:e056ac8fecf8 262 p += cert_len;
valeyev 0:e056ac8fecf8 263 }
valeyev 0:e056ac8fecf8 264 #endif /* MBEDTLS_X509_CRT_PARSE_C */
valeyev 0:e056ac8fecf8 265
valeyev 0:e056ac8fecf8 266 if( p != end )
valeyev 0:e056ac8fecf8 267 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
valeyev 0:e056ac8fecf8 268
valeyev 0:e056ac8fecf8 269 return( 0 );
valeyev 0:e056ac8fecf8 270 }
valeyev 0:e056ac8fecf8 271
valeyev 0:e056ac8fecf8 272 /*
valeyev 0:e056ac8fecf8 273 * Create session ticket, with the following structure:
valeyev 0:e056ac8fecf8 274 *
valeyev 0:e056ac8fecf8 275 * struct {
valeyev 0:e056ac8fecf8 276 * opaque key_name[4];
valeyev 0:e056ac8fecf8 277 * opaque iv[12];
valeyev 0:e056ac8fecf8 278 * opaque encrypted_state<0..2^16-1>;
valeyev 0:e056ac8fecf8 279 * opaque tag[16];
valeyev 0:e056ac8fecf8 280 * } ticket;
valeyev 0:e056ac8fecf8 281 *
valeyev 0:e056ac8fecf8 282 * The key_name, iv, and length of encrypted_state are the additional
valeyev 0:e056ac8fecf8 283 * authenticated data.
valeyev 0:e056ac8fecf8 284 */
valeyev 0:e056ac8fecf8 285 int mbedtls_ssl_ticket_write( void *p_ticket,
valeyev 0:e056ac8fecf8 286 const mbedtls_ssl_session *session,
valeyev 0:e056ac8fecf8 287 unsigned char *start,
valeyev 0:e056ac8fecf8 288 const unsigned char *end,
valeyev 0:e056ac8fecf8 289 size_t *tlen,
valeyev 0:e056ac8fecf8 290 uint32_t *ticket_lifetime )
valeyev 0:e056ac8fecf8 291 {
valeyev 0:e056ac8fecf8 292 int ret;
valeyev 0:e056ac8fecf8 293 mbedtls_ssl_ticket_context *ctx = p_ticket;
valeyev 0:e056ac8fecf8 294 mbedtls_ssl_ticket_key *key;
valeyev 0:e056ac8fecf8 295 unsigned char *key_name = start;
valeyev 0:e056ac8fecf8 296 unsigned char *iv = start + 4;
valeyev 0:e056ac8fecf8 297 unsigned char *state_len_bytes = iv + 12;
valeyev 0:e056ac8fecf8 298 unsigned char *state = state_len_bytes + 2;
valeyev 0:e056ac8fecf8 299 unsigned char *tag;
valeyev 0:e056ac8fecf8 300 size_t clear_len, ciph_len;
valeyev 0:e056ac8fecf8 301
valeyev 0:e056ac8fecf8 302 *tlen = 0;
valeyev 0:e056ac8fecf8 303
valeyev 0:e056ac8fecf8 304 if( ctx == NULL || ctx->f_rng == NULL )
valeyev 0:e056ac8fecf8 305 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
valeyev 0:e056ac8fecf8 306
valeyev 0:e056ac8fecf8 307 /* We need at least 4 bytes for key_name, 12 for IV, 2 for len 16 for tag,
valeyev 0:e056ac8fecf8 308 * in addition to session itself, that will be checked when writing it. */
valeyev 0:e056ac8fecf8 309 if( end - start < 4 + 12 + 2 + 16 )
valeyev 0:e056ac8fecf8 310 return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
valeyev 0:e056ac8fecf8 311
valeyev 0:e056ac8fecf8 312 #if defined(MBEDTLS_THREADING_C)
valeyev 0:e056ac8fecf8 313 if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
valeyev 0:e056ac8fecf8 314 return( ret );
valeyev 0:e056ac8fecf8 315 #endif
valeyev 0:e056ac8fecf8 316
valeyev 0:e056ac8fecf8 317 if( ( ret = ssl_ticket_update_keys( ctx ) ) != 0 )
valeyev 0:e056ac8fecf8 318 goto cleanup;
valeyev 0:e056ac8fecf8 319
valeyev 0:e056ac8fecf8 320 key = &ctx->keys[ctx->active];
valeyev 0:e056ac8fecf8 321
valeyev 0:e056ac8fecf8 322 *ticket_lifetime = ctx->ticket_lifetime;
valeyev 0:e056ac8fecf8 323
valeyev 0:e056ac8fecf8 324 memcpy( key_name, key->name, 4 );
valeyev 0:e056ac8fecf8 325
valeyev 0:e056ac8fecf8 326 if( ( ret = ctx->f_rng( ctx->p_rng, iv, 12 ) ) != 0 )
valeyev 0:e056ac8fecf8 327 goto cleanup;
valeyev 0:e056ac8fecf8 328
valeyev 0:e056ac8fecf8 329 /* Dump session state */
valeyev 0:e056ac8fecf8 330 if( ( ret = ssl_save_session( session,
valeyev 0:e056ac8fecf8 331 state, end - state, &clear_len ) ) != 0 ||
valeyev 0:e056ac8fecf8 332 (unsigned long) clear_len > 65535 )
valeyev 0:e056ac8fecf8 333 {
valeyev 0:e056ac8fecf8 334 goto cleanup;
valeyev 0:e056ac8fecf8 335 }
valeyev 0:e056ac8fecf8 336 state_len_bytes[0] = ( clear_len >> 8 ) & 0xff;
valeyev 0:e056ac8fecf8 337 state_len_bytes[1] = ( clear_len ) & 0xff;
valeyev 0:e056ac8fecf8 338
valeyev 0:e056ac8fecf8 339 /* Encrypt and authenticate */
valeyev 0:e056ac8fecf8 340 tag = state + clear_len;
valeyev 0:e056ac8fecf8 341 if( ( ret = mbedtls_cipher_auth_encrypt( &key->ctx,
valeyev 0:e056ac8fecf8 342 iv, 12, key_name, 4 + 12 + 2,
valeyev 0:e056ac8fecf8 343 state, clear_len, state, &ciph_len, tag, 16 ) ) != 0 )
valeyev 0:e056ac8fecf8 344 {
valeyev 0:e056ac8fecf8 345 goto cleanup;
valeyev 0:e056ac8fecf8 346 }
valeyev 0:e056ac8fecf8 347 if( ciph_len != clear_len )
valeyev 0:e056ac8fecf8 348 {
valeyev 0:e056ac8fecf8 349 ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR;
valeyev 0:e056ac8fecf8 350 goto cleanup;
valeyev 0:e056ac8fecf8 351 }
valeyev 0:e056ac8fecf8 352
valeyev 0:e056ac8fecf8 353 *tlen = 4 + 12 + 2 + 16 + ciph_len;
valeyev 0:e056ac8fecf8 354
valeyev 0:e056ac8fecf8 355 cleanup:
valeyev 0:e056ac8fecf8 356 #if defined(MBEDTLS_THREADING_C)
valeyev 0:e056ac8fecf8 357 if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
valeyev 0:e056ac8fecf8 358 return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
valeyev 0:e056ac8fecf8 359 #endif
valeyev 0:e056ac8fecf8 360
valeyev 0:e056ac8fecf8 361 return( ret );
valeyev 0:e056ac8fecf8 362 }
valeyev 0:e056ac8fecf8 363
valeyev 0:e056ac8fecf8 364 /*
valeyev 0:e056ac8fecf8 365 * Select key based on name
valeyev 0:e056ac8fecf8 366 */
valeyev 0:e056ac8fecf8 367 static mbedtls_ssl_ticket_key *ssl_ticket_select_key(
valeyev 0:e056ac8fecf8 368 mbedtls_ssl_ticket_context *ctx,
valeyev 0:e056ac8fecf8 369 const unsigned char name[4] )
valeyev 0:e056ac8fecf8 370 {
valeyev 0:e056ac8fecf8 371 unsigned char i;
valeyev 0:e056ac8fecf8 372
valeyev 0:e056ac8fecf8 373 for( i = 0; i < sizeof( ctx->keys ) / sizeof( *ctx->keys ); i++ )
valeyev 0:e056ac8fecf8 374 if( memcmp( name, ctx->keys[i].name, 4 ) == 0 )
valeyev 0:e056ac8fecf8 375 return( &ctx->keys[i] );
valeyev 0:e056ac8fecf8 376
valeyev 0:e056ac8fecf8 377 return( NULL );
valeyev 0:e056ac8fecf8 378 }
valeyev 0:e056ac8fecf8 379
valeyev 0:e056ac8fecf8 380 /*
valeyev 0:e056ac8fecf8 381 * Load session ticket (see mbedtls_ssl_ticket_write for structure)
valeyev 0:e056ac8fecf8 382 */
valeyev 0:e056ac8fecf8 383 int mbedtls_ssl_ticket_parse( void *p_ticket,
valeyev 0:e056ac8fecf8 384 mbedtls_ssl_session *session,
valeyev 0:e056ac8fecf8 385 unsigned char *buf,
valeyev 0:e056ac8fecf8 386 size_t len )
valeyev 0:e056ac8fecf8 387 {
valeyev 0:e056ac8fecf8 388 int ret;
valeyev 0:e056ac8fecf8 389 mbedtls_ssl_ticket_context *ctx = p_ticket;
valeyev 0:e056ac8fecf8 390 mbedtls_ssl_ticket_key *key;
valeyev 0:e056ac8fecf8 391 unsigned char *key_name = buf;
valeyev 0:e056ac8fecf8 392 unsigned char *iv = buf + 4;
valeyev 0:e056ac8fecf8 393 unsigned char *enc_len_p = iv + 12;
valeyev 0:e056ac8fecf8 394 unsigned char *ticket = enc_len_p + 2;
valeyev 0:e056ac8fecf8 395 unsigned char *tag;
valeyev 0:e056ac8fecf8 396 size_t enc_len, clear_len;
valeyev 0:e056ac8fecf8 397
valeyev 0:e056ac8fecf8 398 if( ctx == NULL || ctx->f_rng == NULL )
valeyev 0:e056ac8fecf8 399 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
valeyev 0:e056ac8fecf8 400
valeyev 0:e056ac8fecf8 401 /* See mbedtls_ssl_ticket_write() */
valeyev 0:e056ac8fecf8 402 if( len < 4 + 12 + 2 + 16 )
valeyev 0:e056ac8fecf8 403 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
valeyev 0:e056ac8fecf8 404
valeyev 0:e056ac8fecf8 405 #if defined(MBEDTLS_THREADING_C)
valeyev 0:e056ac8fecf8 406 if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
valeyev 0:e056ac8fecf8 407 return( ret );
valeyev 0:e056ac8fecf8 408 #endif
valeyev 0:e056ac8fecf8 409
valeyev 0:e056ac8fecf8 410 if( ( ret = ssl_ticket_update_keys( ctx ) ) != 0 )
valeyev 0:e056ac8fecf8 411 goto cleanup;
valeyev 0:e056ac8fecf8 412
valeyev 0:e056ac8fecf8 413 enc_len = ( enc_len_p[0] << 8 ) | enc_len_p[1];
valeyev 0:e056ac8fecf8 414 tag = ticket + enc_len;
valeyev 0:e056ac8fecf8 415
valeyev 0:e056ac8fecf8 416 if( len != 4 + 12 + 2 + enc_len + 16 )
valeyev 0:e056ac8fecf8 417 {
valeyev 0:e056ac8fecf8 418 ret = MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
valeyev 0:e056ac8fecf8 419 goto cleanup;
valeyev 0:e056ac8fecf8 420 }
valeyev 0:e056ac8fecf8 421
valeyev 0:e056ac8fecf8 422 /* Select key */
valeyev 0:e056ac8fecf8 423 if( ( key = ssl_ticket_select_key( ctx, key_name ) ) == NULL )
valeyev 0:e056ac8fecf8 424 {
valeyev 0:e056ac8fecf8 425 /* We can't know for sure but this is a likely option unless we're
valeyev 0:e056ac8fecf8 426 * under attack - this is only informative anyway */
valeyev 0:e056ac8fecf8 427 ret = MBEDTLS_ERR_SSL_SESSION_TICKET_EXPIRED;
valeyev 0:e056ac8fecf8 428 goto cleanup;
valeyev 0:e056ac8fecf8 429 }
valeyev 0:e056ac8fecf8 430
valeyev 0:e056ac8fecf8 431 /* Decrypt and authenticate */
valeyev 0:e056ac8fecf8 432 if( ( ret = mbedtls_cipher_auth_decrypt( &key->ctx, iv, 12,
valeyev 0:e056ac8fecf8 433 key_name, 4 + 12 + 2, ticket, enc_len,
valeyev 0:e056ac8fecf8 434 ticket, &clear_len, tag, 16 ) ) != 0 )
valeyev 0:e056ac8fecf8 435 {
valeyev 0:e056ac8fecf8 436 if( ret == MBEDTLS_ERR_CIPHER_AUTH_FAILED )
valeyev 0:e056ac8fecf8 437 ret = MBEDTLS_ERR_SSL_INVALID_MAC;
valeyev 0:e056ac8fecf8 438
valeyev 0:e056ac8fecf8 439 goto cleanup;
valeyev 0:e056ac8fecf8 440 }
valeyev 0:e056ac8fecf8 441 if( clear_len != enc_len )
valeyev 0:e056ac8fecf8 442 {
valeyev 0:e056ac8fecf8 443 ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR;
valeyev 0:e056ac8fecf8 444 goto cleanup;
valeyev 0:e056ac8fecf8 445 }
valeyev 0:e056ac8fecf8 446
valeyev 0:e056ac8fecf8 447 /* Actually load session */
valeyev 0:e056ac8fecf8 448 if( ( ret = ssl_load_session( session, ticket, clear_len ) ) != 0 )
valeyev 0:e056ac8fecf8 449 goto cleanup;
valeyev 0:e056ac8fecf8 450
valeyev 0:e056ac8fecf8 451 #if defined(MBEDTLS_HAVE_TIME)
valeyev 0:e056ac8fecf8 452 {
valeyev 0:e056ac8fecf8 453 /* Check for expiration */
valeyev 0:e056ac8fecf8 454 mbedtls_time_t current_time = mbedtls_time( NULL );
valeyev 0:e056ac8fecf8 455
valeyev 0:e056ac8fecf8 456 if( current_time < session->start ||
valeyev 0:e056ac8fecf8 457 (uint32_t)( current_time - session->start ) > ctx->ticket_lifetime )
valeyev 0:e056ac8fecf8 458 {
valeyev 0:e056ac8fecf8 459 ret = MBEDTLS_ERR_SSL_SESSION_TICKET_EXPIRED;
valeyev 0:e056ac8fecf8 460 goto cleanup;
valeyev 0:e056ac8fecf8 461 }
valeyev 0:e056ac8fecf8 462 }
valeyev 0:e056ac8fecf8 463 #endif
valeyev 0:e056ac8fecf8 464
valeyev 0:e056ac8fecf8 465 cleanup:
valeyev 0:e056ac8fecf8 466 #if defined(MBEDTLS_THREADING_C)
valeyev 0:e056ac8fecf8 467 if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
valeyev 0:e056ac8fecf8 468 return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
valeyev 0:e056ac8fecf8 469 #endif
valeyev 0:e056ac8fecf8 470
valeyev 0:e056ac8fecf8 471 return( ret );
valeyev 0:e056ac8fecf8 472 }
valeyev 0:e056ac8fecf8 473
valeyev 0:e056ac8fecf8 474 /*
valeyev 0:e056ac8fecf8 475 * Free context
valeyev 0:e056ac8fecf8 476 */
valeyev 0:e056ac8fecf8 477 void mbedtls_ssl_ticket_free( mbedtls_ssl_ticket_context *ctx )
valeyev 0:e056ac8fecf8 478 {
valeyev 0:e056ac8fecf8 479 mbedtls_cipher_free( &ctx->keys[0].ctx );
valeyev 0:e056ac8fecf8 480 mbedtls_cipher_free( &ctx->keys[1].ctx );
valeyev 0:e056ac8fecf8 481
valeyev 0:e056ac8fecf8 482 #if defined(MBEDTLS_THREADING_C)
valeyev 0:e056ac8fecf8 483 mbedtls_mutex_free( &ctx->mutex );
valeyev 0:e056ac8fecf8 484 #endif
valeyev 0:e056ac8fecf8 485
valeyev 0:e056ac8fecf8 486 mbedtls_zeroize( ctx, sizeof( mbedtls_ssl_ticket_context ) );
valeyev 0:e056ac8fecf8 487 }
valeyev 0:e056ac8fecf8 488
valeyev 0:e056ac8fecf8 489 #endif /* MBEDTLS_SSL_TICKET_C */