erkin yucel / mbed-os

mbed os with nrf51 internal bandgap enabled to read battery level

Dependents:   BLE_file_test BLE_Blink ExternalEncoder

features/mbedtls/src/ssl_ticket.c@0:f269e3021894, 2016-10-23 (annotated)

Committer:
elessair
Date:
Sun Oct 23 15:10:02 2016 +0000
Revision:
0:f269e3021894
Initial commit

Who changed what in which revision?

UserRevisionLine numberNew contents of line
elessair 0:f269e3021894 1 /*
elessair 0:f269e3021894 2 * TLS server tickets callbacks implementation
elessair 0:f269e3021894 3 *
elessair 0:f269e3021894 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
elessair 0:f269e3021894 5 * SPDX-License-Identifier: Apache-2.0
elessair 0:f269e3021894 6 *
elessair 0:f269e3021894 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
elessair 0:f269e3021894 8 * not use this file except in compliance with the License.
elessair 0:f269e3021894 9 * You may obtain a copy of the License at
elessair 0:f269e3021894 10 *
elessair 0:f269e3021894 11 * http://www.apache.org/licenses/LICENSE-2.0
elessair 0:f269e3021894 12 *
elessair 0:f269e3021894 13 * Unless required by applicable law or agreed to in writing, software
elessair 0:f269e3021894 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
elessair 0:f269e3021894 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
elessair 0:f269e3021894 16 * See the License for the specific language governing permissions and
elessair 0:f269e3021894 17 * limitations under the License.
elessair 0:f269e3021894 18 *
elessair 0:f269e3021894 19 * This file is part of mbed TLS (https://tls.mbed.org)
elessair 0:f269e3021894 20 */
elessair 0:f269e3021894 21
elessair 0:f269e3021894 22 #if !defined(MBEDTLS_CONFIG_FILE)
elessair 0:f269e3021894 23 #include "mbedtls/config.h"
elessair 0:f269e3021894 24 #else
elessair 0:f269e3021894 25 #include MBEDTLS_CONFIG_FILE
elessair 0:f269e3021894 26 #endif
elessair 0:f269e3021894 27
elessair 0:f269e3021894 28 #if defined(MBEDTLS_SSL_TICKET_C)
elessair 0:f269e3021894 29
elessair 0:f269e3021894 30 #if defined(MBEDTLS_PLATFORM_C)
elessair 0:f269e3021894 31 #include "mbedtls/platform.h"
elessair 0:f269e3021894 32 #else
elessair 0:f269e3021894 33 #include <stdlib.h>
elessair 0:f269e3021894 34 #define mbedtls_calloc calloc
elessair 0:f269e3021894 35 #define mbedtls_free free
elessair 0:f269e3021894 36 #endif
elessair 0:f269e3021894 37
elessair 0:f269e3021894 38 #include "mbedtls/ssl_ticket.h"
elessair 0:f269e3021894 39
elessair 0:f269e3021894 40 #include <string.h>
elessair 0:f269e3021894 41
elessair 0:f269e3021894 42 /* Implementation that should never be optimized out by the compiler */
elessair 0:f269e3021894 43 static void mbedtls_zeroize( void *v, size_t n ) {
elessair 0:f269e3021894 44 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
elessair 0:f269e3021894 45 }
elessair 0:f269e3021894 46
elessair 0:f269e3021894 47 /*
elessair 0:f269e3021894 48 * Initialze context
elessair 0:f269e3021894 49 */
elessair 0:f269e3021894 50 void mbedtls_ssl_ticket_init( mbedtls_ssl_ticket_context *ctx )
elessair 0:f269e3021894 51 {
elessair 0:f269e3021894 52 memset( ctx, 0, sizeof( mbedtls_ssl_ticket_context ) );
elessair 0:f269e3021894 53
elessair 0:f269e3021894 54 #if defined(MBEDTLS_THREADING_C)
elessair 0:f269e3021894 55 mbedtls_mutex_init( &ctx->mutex );
elessair 0:f269e3021894 56 #endif
elessair 0:f269e3021894 57 }
elessair 0:f269e3021894 58
elessair 0:f269e3021894 59 #define MAX_KEY_BYTES 32 /* 256 bits */
elessair 0:f269e3021894 60
elessair 0:f269e3021894 61 /*
elessair 0:f269e3021894 62 * Generate/update a key
elessair 0:f269e3021894 63 */
elessair 0:f269e3021894 64 static int ssl_ticket_gen_key( mbedtls_ssl_ticket_context *ctx,
elessair 0:f269e3021894 65 unsigned char index )
elessair 0:f269e3021894 66 {
elessair 0:f269e3021894 67 int ret;
elessair 0:f269e3021894 68 unsigned char buf[MAX_KEY_BYTES];
elessair 0:f269e3021894 69 mbedtls_ssl_ticket_key *key = ctx->keys + index;
elessair 0:f269e3021894 70
elessair 0:f269e3021894 71 #if defined(MBEDTLS_HAVE_TIME)
elessair 0:f269e3021894 72 key->generation_time = (uint32_t) mbedtls_time( NULL );
elessair 0:f269e3021894 73 #endif
elessair 0:f269e3021894 74
elessair 0:f269e3021894 75 if( ( ret = ctx->f_rng( ctx->p_rng, key->name, sizeof( key->name ) ) ) != 0 )
elessair 0:f269e3021894 76 return( ret );
elessair 0:f269e3021894 77
elessair 0:f269e3021894 78 if( ( ret = ctx->f_rng( ctx->p_rng, buf, sizeof( buf ) ) ) != 0 )
elessair 0:f269e3021894 79 return( ret );
elessair 0:f269e3021894 80
elessair 0:f269e3021894 81 /* With GCM and CCM, same context can encrypt & decrypt */
elessair 0:f269e3021894 82 ret = mbedtls_cipher_setkey( &key->ctx, buf,
elessair 0:f269e3021894 83 mbedtls_cipher_get_key_bitlen( &key->ctx ),
elessair 0:f269e3021894 84 MBEDTLS_ENCRYPT );
elessair 0:f269e3021894 85
elessair 0:f269e3021894 86 mbedtls_zeroize( buf, sizeof( buf ) );
elessair 0:f269e3021894 87
elessair 0:f269e3021894 88 return( ret );
elessair 0:f269e3021894 89 }
elessair 0:f269e3021894 90
elessair 0:f269e3021894 91 /*
elessair 0:f269e3021894 92 * Rotate/generate keys if necessary
elessair 0:f269e3021894 93 */
elessair 0:f269e3021894 94 static int ssl_ticket_update_keys( mbedtls_ssl_ticket_context *ctx )
elessair 0:f269e3021894 95 {
elessair 0:f269e3021894 96 #if !defined(MBEDTLS_HAVE_TIME)
elessair 0:f269e3021894 97 ((void) ctx);
elessair 0:f269e3021894 98 #else
elessair 0:f269e3021894 99 if( ctx->ticket_lifetime != 0 )
elessair 0:f269e3021894 100 {
elessair 0:f269e3021894 101 uint32_t current_time = (uint32_t) mbedtls_time( NULL );
elessair 0:f269e3021894 102 uint32_t key_time = ctx->keys[ctx->active].generation_time;
elessair 0:f269e3021894 103
elessair 0:f269e3021894 104 if( current_time > key_time &&
elessair 0:f269e3021894 105 current_time - key_time < ctx->ticket_lifetime )
elessair 0:f269e3021894 106 {
elessair 0:f269e3021894 107 return( 0 );
elessair 0:f269e3021894 108 }
elessair 0:f269e3021894 109
elessair 0:f269e3021894 110 ctx->active = 1 - ctx->active;
elessair 0:f269e3021894 111
elessair 0:f269e3021894 112 return( ssl_ticket_gen_key( ctx, ctx->active ) );
elessair 0:f269e3021894 113 }
elessair 0:f269e3021894 114 else
elessair 0:f269e3021894 115 #endif /* MBEDTLS_HAVE_TIME */
elessair 0:f269e3021894 116 return( 0 );
elessair 0:f269e3021894 117 }
elessair 0:f269e3021894 118
elessair 0:f269e3021894 119 /*
elessair 0:f269e3021894 120 * Setup context for actual use
elessair 0:f269e3021894 121 */
elessair 0:f269e3021894 122 int mbedtls_ssl_ticket_setup( mbedtls_ssl_ticket_context *ctx,
elessair 0:f269e3021894 123 int (*f_rng)(void *, unsigned char *, size_t), void *p_rng,
elessair 0:f269e3021894 124 mbedtls_cipher_type_t cipher,
elessair 0:f269e3021894 125 uint32_t lifetime )
elessair 0:f269e3021894 126 {
elessair 0:f269e3021894 127 int ret;
elessair 0:f269e3021894 128 const mbedtls_cipher_info_t *cipher_info;
elessair 0:f269e3021894 129
elessair 0:f269e3021894 130 ctx->f_rng = f_rng;
elessair 0:f269e3021894 131 ctx->p_rng = p_rng;
elessair 0:f269e3021894 132
elessair 0:f269e3021894 133 ctx->ticket_lifetime = lifetime;
elessair 0:f269e3021894 134
elessair 0:f269e3021894 135 cipher_info = mbedtls_cipher_info_from_type( cipher);
elessair 0:f269e3021894 136 if( cipher_info == NULL )
elessair 0:f269e3021894 137 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
elessair 0:f269e3021894 138
elessair 0:f269e3021894 139 if( cipher_info->mode != MBEDTLS_MODE_GCM &&
elessair 0:f269e3021894 140 cipher_info->mode != MBEDTLS_MODE_CCM )
elessair 0:f269e3021894 141 {
elessair 0:f269e3021894 142 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
elessair 0:f269e3021894 143 }
elessair 0:f269e3021894 144
elessair 0:f269e3021894 145 if( cipher_info->key_bitlen > 8 * MAX_KEY_BYTES )
elessair 0:f269e3021894 146 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
elessair 0:f269e3021894 147
elessair 0:f269e3021894 148 if( ( ret = mbedtls_cipher_setup( &ctx->keys[0].ctx, cipher_info ) ) != 0 ||
elessair 0:f269e3021894 149 ( ret = mbedtls_cipher_setup( &ctx->keys[1].ctx, cipher_info ) ) != 0 )
elessair 0:f269e3021894 150 {
elessair 0:f269e3021894 151 return( ret );
elessair 0:f269e3021894 152 }
elessair 0:f269e3021894 153
elessair 0:f269e3021894 154 if( ( ret = ssl_ticket_gen_key( ctx, 0 ) ) != 0 ||
elessair 0:f269e3021894 155 ( ret = ssl_ticket_gen_key( ctx, 1 ) ) != 0 )
elessair 0:f269e3021894 156 {
elessair 0:f269e3021894 157 return( ret );
elessair 0:f269e3021894 158 }
elessair 0:f269e3021894 159
elessair 0:f269e3021894 160 return( 0 );
elessair 0:f269e3021894 161 }
elessair 0:f269e3021894 162
elessair 0:f269e3021894 163 /*
elessair 0:f269e3021894 164 * Serialize a session in the following format:
elessair 0:f269e3021894 165 * 0 . n-1 session structure, n = sizeof(mbedtls_ssl_session)
elessair 0:f269e3021894 166 * n . n+2 peer_cert length = m (0 if no certificate)
elessair 0:f269e3021894 167 * n+3 . n+2+m peer cert ASN.1
elessair 0:f269e3021894 168 */
elessair 0:f269e3021894 169 static int ssl_save_session( const mbedtls_ssl_session *session,
elessair 0:f269e3021894 170 unsigned char *buf, size_t buf_len,
elessair 0:f269e3021894 171 size_t *olen )
elessair 0:f269e3021894 172 {
elessair 0:f269e3021894 173 unsigned char *p = buf;
elessair 0:f269e3021894 174 size_t left = buf_len;
elessair 0:f269e3021894 175 #if defined(MBEDTLS_X509_CRT_PARSE_C)
elessair 0:f269e3021894 176 size_t cert_len;
elessair 0:f269e3021894 177 #endif /* MBEDTLS_X509_CRT_PARSE_C */
elessair 0:f269e3021894 178
elessair 0:f269e3021894 179 if( left < sizeof( mbedtls_ssl_session ) )
elessair 0:f269e3021894 180 return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
elessair 0:f269e3021894 181
elessair 0:f269e3021894 182 memcpy( p, session, sizeof( mbedtls_ssl_session ) );
elessair 0:f269e3021894 183 p += sizeof( mbedtls_ssl_session );
elessair 0:f269e3021894 184 left -= sizeof( mbedtls_ssl_session );
elessair 0:f269e3021894 185
elessair 0:f269e3021894 186 #if defined(MBEDTLS_X509_CRT_PARSE_C)
elessair 0:f269e3021894 187 if( session->peer_cert == NULL )
elessair 0:f269e3021894 188 cert_len = 0;
elessair 0:f269e3021894 189 else
elessair 0:f269e3021894 190 cert_len = session->peer_cert->raw.len;
elessair 0:f269e3021894 191
elessair 0:f269e3021894 192 if( left < 3 + cert_len )
elessair 0:f269e3021894 193 return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
elessair 0:f269e3021894 194
elessair 0:f269e3021894 195 *p++ = (unsigned char)( cert_len >> 16 & 0xFF );
elessair 0:f269e3021894 196 *p++ = (unsigned char)( cert_len >> 8 & 0xFF );
elessair 0:f269e3021894 197 *p++ = (unsigned char)( cert_len & 0xFF );
elessair 0:f269e3021894 198
elessair 0:f269e3021894 199 if( session->peer_cert != NULL )
elessair 0:f269e3021894 200 memcpy( p, session->peer_cert->raw.p, cert_len );
elessair 0:f269e3021894 201
elessair 0:f269e3021894 202 p += cert_len;
elessair 0:f269e3021894 203 #endif /* MBEDTLS_X509_CRT_PARSE_C */
elessair 0:f269e3021894 204
elessair 0:f269e3021894 205 *olen = p - buf;
elessair 0:f269e3021894 206
elessair 0:f269e3021894 207 return( 0 );
elessair 0:f269e3021894 208 }
elessair 0:f269e3021894 209
elessair 0:f269e3021894 210 /*
elessair 0:f269e3021894 211 * Unserialise session, see ssl_save_session()
elessair 0:f269e3021894 212 */
elessair 0:f269e3021894 213 static int ssl_load_session( mbedtls_ssl_session *session,
elessair 0:f269e3021894 214 const unsigned char *buf, size_t len )
elessair 0:f269e3021894 215 {
elessair 0:f269e3021894 216 const unsigned char *p = buf;
elessair 0:f269e3021894 217 const unsigned char * const end = buf + len;
elessair 0:f269e3021894 218 #if defined(MBEDTLS_X509_CRT_PARSE_C)
elessair 0:f269e3021894 219 size_t cert_len;
elessair 0:f269e3021894 220 #endif /* MBEDTLS_X509_CRT_PARSE_C */
elessair 0:f269e3021894 221
elessair 0:f269e3021894 222 if( p + sizeof( mbedtls_ssl_session ) > end )
elessair 0:f269e3021894 223 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
elessair 0:f269e3021894 224
elessair 0:f269e3021894 225 memcpy( session, p, sizeof( mbedtls_ssl_session ) );
elessair 0:f269e3021894 226 p += sizeof( mbedtls_ssl_session );
elessair 0:f269e3021894 227
elessair 0:f269e3021894 228 #if defined(MBEDTLS_X509_CRT_PARSE_C)
elessair 0:f269e3021894 229 if( p + 3 > end )
elessair 0:f269e3021894 230 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
elessair 0:f269e3021894 231
elessair 0:f269e3021894 232 cert_len = ( p[0] << 16 ) | ( p[1] << 8 ) | p[2];
elessair 0:f269e3021894 233 p += 3;
elessair 0:f269e3021894 234
elessair 0:f269e3021894 235 if( cert_len == 0 )
elessair 0:f269e3021894 236 {
elessair 0:f269e3021894 237 session->peer_cert = NULL;
elessair 0:f269e3021894 238 }
elessair 0:f269e3021894 239 else
elessair 0:f269e3021894 240 {
elessair 0:f269e3021894 241 int ret;
elessair 0:f269e3021894 242
elessair 0:f269e3021894 243 if( p + cert_len > end )
elessair 0:f269e3021894 244 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
elessair 0:f269e3021894 245
elessair 0:f269e3021894 246 session->peer_cert = mbedtls_calloc( 1, sizeof( mbedtls_x509_crt ) );
elessair 0:f269e3021894 247
elessair 0:f269e3021894 248 if( session->peer_cert == NULL )
elessair 0:f269e3021894 249 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
elessair 0:f269e3021894 250
elessair 0:f269e3021894 251 mbedtls_x509_crt_init( session->peer_cert );
elessair 0:f269e3021894 252
elessair 0:f269e3021894 253 if( ( ret = mbedtls_x509_crt_parse_der( session->peer_cert,
elessair 0:f269e3021894 254 p, cert_len ) ) != 0 )
elessair 0:f269e3021894 255 {
elessair 0:f269e3021894 256 mbedtls_x509_crt_free( session->peer_cert );
elessair 0:f269e3021894 257 mbedtls_free( session->peer_cert );
elessair 0:f269e3021894 258 session->peer_cert = NULL;
elessair 0:f269e3021894 259 return( ret );
elessair 0:f269e3021894 260 }
elessair 0:f269e3021894 261
elessair 0:f269e3021894 262 p += cert_len;
elessair 0:f269e3021894 263 }
elessair 0:f269e3021894 264 #endif /* MBEDTLS_X509_CRT_PARSE_C */
elessair 0:f269e3021894 265
elessair 0:f269e3021894 266 if( p != end )
elessair 0:f269e3021894 267 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
elessair 0:f269e3021894 268
elessair 0:f269e3021894 269 return( 0 );
elessair 0:f269e3021894 270 }
elessair 0:f269e3021894 271
elessair 0:f269e3021894 272 /*
elessair 0:f269e3021894 273 * Create session ticket, with the following structure:
elessair 0:f269e3021894 274 *
elessair 0:f269e3021894 275 * struct {
elessair 0:f269e3021894 276 * opaque key_name[4];
elessair 0:f269e3021894 277 * opaque iv[12];
elessair 0:f269e3021894 278 * opaque encrypted_state<0..2^16-1>;
elessair 0:f269e3021894 279 * opaque tag[16];
elessair 0:f269e3021894 280 * } ticket;
elessair 0:f269e3021894 281 *
elessair 0:f269e3021894 282 * The key_name, iv, and length of encrypted_state are the additional
elessair 0:f269e3021894 283 * authenticated data.
elessair 0:f269e3021894 284 */
elessair 0:f269e3021894 285 int mbedtls_ssl_ticket_write( void *p_ticket,
elessair 0:f269e3021894 286 const mbedtls_ssl_session *session,
elessair 0:f269e3021894 287 unsigned char *start,
elessair 0:f269e3021894 288 const unsigned char *end,
elessair 0:f269e3021894 289 size_t *tlen,
elessair 0:f269e3021894 290 uint32_t *ticket_lifetime )
elessair 0:f269e3021894 291 {
elessair 0:f269e3021894 292 int ret;
elessair 0:f269e3021894 293 mbedtls_ssl_ticket_context *ctx = p_ticket;
elessair 0:f269e3021894 294 mbedtls_ssl_ticket_key *key;
elessair 0:f269e3021894 295 unsigned char *key_name = start;
elessair 0:f269e3021894 296 unsigned char *iv = start + 4;
elessair 0:f269e3021894 297 unsigned char *state_len_bytes = iv + 12;
elessair 0:f269e3021894 298 unsigned char *state = state_len_bytes + 2;
elessair 0:f269e3021894 299 unsigned char *tag;
elessair 0:f269e3021894 300 size_t clear_len, ciph_len;
elessair 0:f269e3021894 301
elessair 0:f269e3021894 302 *tlen = 0;
elessair 0:f269e3021894 303
elessair 0:f269e3021894 304 if( ctx == NULL || ctx->f_rng == NULL )
elessair 0:f269e3021894 305 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
elessair 0:f269e3021894 306
elessair 0:f269e3021894 307 /* We need at least 4 bytes for key_name, 12 for IV, 2 for len 16 for tag,
elessair 0:f269e3021894 308 * in addition to session itself, that will be checked when writing it. */
elessair 0:f269e3021894 309 if( end - start < 4 + 12 + 2 + 16 )
elessair 0:f269e3021894 310 return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
elessair 0:f269e3021894 311
elessair 0:f269e3021894 312 #if defined(MBEDTLS_THREADING_C)
elessair 0:f269e3021894 313 if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
elessair 0:f269e3021894 314 return( ret );
elessair 0:f269e3021894 315 #endif
elessair 0:f269e3021894 316
elessair 0:f269e3021894 317 if( ( ret = ssl_ticket_update_keys( ctx ) ) != 0 )
elessair 0:f269e3021894 318 goto cleanup;
elessair 0:f269e3021894 319
elessair 0:f269e3021894 320 key = &ctx->keys[ctx->active];
elessair 0:f269e3021894 321
elessair 0:f269e3021894 322 *ticket_lifetime = ctx->ticket_lifetime;
elessair 0:f269e3021894 323
elessair 0:f269e3021894 324 memcpy( key_name, key->name, 4 );
elessair 0:f269e3021894 325
elessair 0:f269e3021894 326 if( ( ret = ctx->f_rng( ctx->p_rng, iv, 12 ) ) != 0 )
elessair 0:f269e3021894 327 goto cleanup;
elessair 0:f269e3021894 328
elessair 0:f269e3021894 329 /* Dump session state */
elessair 0:f269e3021894 330 if( ( ret = ssl_save_session( session,
elessair 0:f269e3021894 331 state, end - state, &clear_len ) ) != 0 ||
elessair 0:f269e3021894 332 (unsigned long) clear_len > 65535 )
elessair 0:f269e3021894 333 {
elessair 0:f269e3021894 334 goto cleanup;
elessair 0:f269e3021894 335 }
elessair 0:f269e3021894 336 state_len_bytes[0] = ( clear_len >> 8 ) & 0xff;
elessair 0:f269e3021894 337 state_len_bytes[1] = ( clear_len ) & 0xff;
elessair 0:f269e3021894 338
elessair 0:f269e3021894 339 /* Encrypt and authenticate */
elessair 0:f269e3021894 340 tag = state + clear_len;
elessair 0:f269e3021894 341 if( ( ret = mbedtls_cipher_auth_encrypt( &key->ctx,
elessair 0:f269e3021894 342 iv, 12, key_name, 4 + 12 + 2,
elessair 0:f269e3021894 343 state, clear_len, state, &ciph_len, tag, 16 ) ) != 0 )
elessair 0:f269e3021894 344 {
elessair 0:f269e3021894 345 goto cleanup;
elessair 0:f269e3021894 346 }
elessair 0:f269e3021894 347 if( ciph_len != clear_len )
elessair 0:f269e3021894 348 {
elessair 0:f269e3021894 349 ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR;
elessair 0:f269e3021894 350 goto cleanup;
elessair 0:f269e3021894 351 }
elessair 0:f269e3021894 352
elessair 0:f269e3021894 353 *tlen = 4 + 12 + 2 + 16 + ciph_len;
elessair 0:f269e3021894 354
elessair 0:f269e3021894 355 cleanup:
elessair 0:f269e3021894 356 #if defined(MBEDTLS_THREADING_C)
elessair 0:f269e3021894 357 if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
elessair 0:f269e3021894 358 return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
elessair 0:f269e3021894 359 #endif
elessair 0:f269e3021894 360
elessair 0:f269e3021894 361 return( ret );
elessair 0:f269e3021894 362 }
elessair 0:f269e3021894 363
elessair 0:f269e3021894 364 /*
elessair 0:f269e3021894 365 * Select key based on name
elessair 0:f269e3021894 366 */
elessair 0:f269e3021894 367 static mbedtls_ssl_ticket_key *ssl_ticket_select_key(
elessair 0:f269e3021894 368 mbedtls_ssl_ticket_context *ctx,
elessair 0:f269e3021894 369 const unsigned char name[4] )
elessair 0:f269e3021894 370 {
elessair 0:f269e3021894 371 unsigned char i;
elessair 0:f269e3021894 372
elessair 0:f269e3021894 373 for( i = 0; i < sizeof( ctx->keys ) / sizeof( *ctx->keys ); i++ )
elessair 0:f269e3021894 374 if( memcmp( name, ctx->keys[i].name, 4 ) == 0 )
elessair 0:f269e3021894 375 return( &ctx->keys[i] );
elessair 0:f269e3021894 376
elessair 0:f269e3021894 377 return( NULL );
elessair 0:f269e3021894 378 }
elessair 0:f269e3021894 379
elessair 0:f269e3021894 380 /*
elessair 0:f269e3021894 381 * Load session ticket (see mbedtls_ssl_ticket_write for structure)
elessair 0:f269e3021894 382 */
elessair 0:f269e3021894 383 int mbedtls_ssl_ticket_parse( void *p_ticket,
elessair 0:f269e3021894 384 mbedtls_ssl_session *session,
elessair 0:f269e3021894 385 unsigned char *buf,
elessair 0:f269e3021894 386 size_t len )
elessair 0:f269e3021894 387 {
elessair 0:f269e3021894 388 int ret;
elessair 0:f269e3021894 389 mbedtls_ssl_ticket_context *ctx = p_ticket;
elessair 0:f269e3021894 390 mbedtls_ssl_ticket_key *key;
elessair 0:f269e3021894 391 unsigned char *key_name = buf;
elessair 0:f269e3021894 392 unsigned char *iv = buf + 4;
elessair 0:f269e3021894 393 unsigned char *enc_len_p = iv + 12;
elessair 0:f269e3021894 394 unsigned char *ticket = enc_len_p + 2;
elessair 0:f269e3021894 395 unsigned char *tag;
elessair 0:f269e3021894 396 size_t enc_len, clear_len;
elessair 0:f269e3021894 397
elessair 0:f269e3021894 398 if( ctx == NULL || ctx->f_rng == NULL )
elessair 0:f269e3021894 399 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
elessair 0:f269e3021894 400
elessair 0:f269e3021894 401 /* See mbedtls_ssl_ticket_write() */
elessair 0:f269e3021894 402 if( len < 4 + 12 + 2 + 16 )
elessair 0:f269e3021894 403 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
elessair 0:f269e3021894 404
elessair 0:f269e3021894 405 #if defined(MBEDTLS_THREADING_C)
elessair 0:f269e3021894 406 if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
elessair 0:f269e3021894 407 return( ret );
elessair 0:f269e3021894 408 #endif
elessair 0:f269e3021894 409
elessair 0:f269e3021894 410 if( ( ret = ssl_ticket_update_keys( ctx ) ) != 0 )
elessair 0:f269e3021894 411 goto cleanup;
elessair 0:f269e3021894 412
elessair 0:f269e3021894 413 enc_len = ( enc_len_p[0] << 8 ) | enc_len_p[1];
elessair 0:f269e3021894 414 tag = ticket + enc_len;
elessair 0:f269e3021894 415
elessair 0:f269e3021894 416 if( len != 4 + 12 + 2 + enc_len + 16 )
elessair 0:f269e3021894 417 {
elessair 0:f269e3021894 418 ret = MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
elessair 0:f269e3021894 419 goto cleanup;
elessair 0:f269e3021894 420 }
elessair 0:f269e3021894 421
elessair 0:f269e3021894 422 /* Select key */
elessair 0:f269e3021894 423 if( ( key = ssl_ticket_select_key( ctx, key_name ) ) == NULL )
elessair 0:f269e3021894 424 {
elessair 0:f269e3021894 425 /* We can't know for sure but this is a likely option unless we're
elessair 0:f269e3021894 426 * under attack - this is only informative anyway */
elessair 0:f269e3021894 427 ret = MBEDTLS_ERR_SSL_SESSION_TICKET_EXPIRED;
elessair 0:f269e3021894 428 goto cleanup;
elessair 0:f269e3021894 429 }
elessair 0:f269e3021894 430
elessair 0:f269e3021894 431 /* Decrypt and authenticate */
elessair 0:f269e3021894 432 if( ( ret = mbedtls_cipher_auth_decrypt( &key->ctx, iv, 12,
elessair 0:f269e3021894 433 key_name, 4 + 12 + 2, ticket, enc_len,
elessair 0:f269e3021894 434 ticket, &clear_len, tag, 16 ) ) != 0 )
elessair 0:f269e3021894 435 {
elessair 0:f269e3021894 436 if( ret == MBEDTLS_ERR_CIPHER_AUTH_FAILED )
elessair 0:f269e3021894 437 ret = MBEDTLS_ERR_SSL_INVALID_MAC;
elessair 0:f269e3021894 438
elessair 0:f269e3021894 439 goto cleanup;
elessair 0:f269e3021894 440 }
elessair 0:f269e3021894 441 if( clear_len != enc_len )
elessair 0:f269e3021894 442 {
elessair 0:f269e3021894 443 ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR;
elessair 0:f269e3021894 444 goto cleanup;
elessair 0:f269e3021894 445 }
elessair 0:f269e3021894 446
elessair 0:f269e3021894 447 /* Actually load session */
elessair 0:f269e3021894 448 if( ( ret = ssl_load_session( session, ticket, clear_len ) ) != 0 )
elessair 0:f269e3021894 449 goto cleanup;
elessair 0:f269e3021894 450
elessair 0:f269e3021894 451 #if defined(MBEDTLS_HAVE_TIME)
elessair 0:f269e3021894 452 {
elessair 0:f269e3021894 453 /* Check for expiration */
elessair 0:f269e3021894 454 mbedtls_time_t current_time = mbedtls_time( NULL );
elessair 0:f269e3021894 455
elessair 0:f269e3021894 456 if( current_time < session->start ||
elessair 0:f269e3021894 457 (uint32_t)( current_time - session->start ) > ctx->ticket_lifetime )
elessair 0:f269e3021894 458 {
elessair 0:f269e3021894 459 ret = MBEDTLS_ERR_SSL_SESSION_TICKET_EXPIRED;
elessair 0:f269e3021894 460 goto cleanup;
elessair 0:f269e3021894 461 }
elessair 0:f269e3021894 462 }
elessair 0:f269e3021894 463 #endif
elessair 0:f269e3021894 464
elessair 0:f269e3021894 465 cleanup:
elessair 0:f269e3021894 466 #if defined(MBEDTLS_THREADING_C)
elessair 0:f269e3021894 467 if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
elessair 0:f269e3021894 468 return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
elessair 0:f269e3021894 469 #endif
elessair 0:f269e3021894 470
elessair 0:f269e3021894 471 return( ret );
elessair 0:f269e3021894 472 }
elessair 0:f269e3021894 473
elessair 0:f269e3021894 474 /*
elessair 0:f269e3021894 475 * Free context
elessair 0:f269e3021894 476 */
elessair 0:f269e3021894 477 void mbedtls_ssl_ticket_free( mbedtls_ssl_ticket_context *ctx )
elessair 0:f269e3021894 478 {
elessair 0:f269e3021894 479 mbedtls_cipher_free( &ctx->keys[0].ctx );
elessair 0:f269e3021894 480 mbedtls_cipher_free( &ctx->keys[1].ctx );
elessair 0:f269e3021894 481
elessair 0:f269e3021894 482 #if defined(MBEDTLS_THREADING_C)
elessair 0:f269e3021894 483 mbedtls_mutex_free( &ctx->mutex );
elessair 0:f269e3021894 484 #endif
elessair 0:f269e3021894 485
elessair 0:f269e3021894 486 mbedtls_zeroize( ctx, sizeof( mbedtls_ssl_ticket_context ) );
elessair 0:f269e3021894 487 }
elessair 0:f269e3021894 488
elessair 0:f269e3021894 489 #endif /* MBEDTLS_SSL_TICKET_C */