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features/mbedtls/src/ssl_ticket.c@0:b74591d5ab33, 2017-12-11 (annotated)

Committer:
be_bryan
Date:
Mon Dec 11 17:54:04 2017 +0000
Revision:
0:b74591d5ab33
motor ++

Who changed what in which revision?

UserRevisionLine numberNew contents of line
be_bryan 0:b74591d5ab33 1 /*
be_bryan 0:b74591d5ab33 2 * TLS server tickets callbacks implementation
be_bryan 0:b74591d5ab33 3 *
be_bryan 0:b74591d5ab33 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
be_bryan 0:b74591d5ab33 5 * SPDX-License-Identifier: Apache-2.0
be_bryan 0:b74591d5ab33 6 *
be_bryan 0:b74591d5ab33 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
be_bryan 0:b74591d5ab33 8 * not use this file except in compliance with the License.
be_bryan 0:b74591d5ab33 9 * You may obtain a copy of the License at
be_bryan 0:b74591d5ab33 10 *
be_bryan 0:b74591d5ab33 11 * http://www.apache.org/licenses/LICENSE-2.0
be_bryan 0:b74591d5ab33 12 *
be_bryan 0:b74591d5ab33 13 * Unless required by applicable law or agreed to in writing, software
be_bryan 0:b74591d5ab33 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
be_bryan 0:b74591d5ab33 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
be_bryan 0:b74591d5ab33 16 * See the License for the specific language governing permissions and
be_bryan 0:b74591d5ab33 17 * limitations under the License.
be_bryan 0:b74591d5ab33 18 *
be_bryan 0:b74591d5ab33 19 * This file is part of mbed TLS (https://tls.mbed.org)
be_bryan 0:b74591d5ab33 20 */
be_bryan 0:b74591d5ab33 21
be_bryan 0:b74591d5ab33 22 #if !defined(MBEDTLS_CONFIG_FILE)
be_bryan 0:b74591d5ab33 23 #include "mbedtls/config.h"
be_bryan 0:b74591d5ab33 24 #else
be_bryan 0:b74591d5ab33 25 #include MBEDTLS_CONFIG_FILE
be_bryan 0:b74591d5ab33 26 #endif
be_bryan 0:b74591d5ab33 27
be_bryan 0:b74591d5ab33 28 #if defined(MBEDTLS_SSL_TICKET_C)
be_bryan 0:b74591d5ab33 29
be_bryan 0:b74591d5ab33 30 #if defined(MBEDTLS_PLATFORM_C)
be_bryan 0:b74591d5ab33 31 #include "mbedtls/platform.h"
be_bryan 0:b74591d5ab33 32 #else
be_bryan 0:b74591d5ab33 33 #include <stdlib.h>
be_bryan 0:b74591d5ab33 34 #define mbedtls_calloc calloc
be_bryan 0:b74591d5ab33 35 #define mbedtls_free free
be_bryan 0:b74591d5ab33 36 #endif
be_bryan 0:b74591d5ab33 37
be_bryan 0:b74591d5ab33 38 #include "mbedtls/ssl_ticket.h"
be_bryan 0:b74591d5ab33 39
be_bryan 0:b74591d5ab33 40 #include <string.h>
be_bryan 0:b74591d5ab33 41
be_bryan 0:b74591d5ab33 42 /* Implementation that should never be optimized out by the compiler */
be_bryan 0:b74591d5ab33 43 static void mbedtls_zeroize( void *v, size_t n ) {
be_bryan 0:b74591d5ab33 44 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
be_bryan 0:b74591d5ab33 45 }
be_bryan 0:b74591d5ab33 46
be_bryan 0:b74591d5ab33 47 /*
be_bryan 0:b74591d5ab33 48 * Initialze context
be_bryan 0:b74591d5ab33 49 */
be_bryan 0:b74591d5ab33 50 void mbedtls_ssl_ticket_init( mbedtls_ssl_ticket_context *ctx )
be_bryan 0:b74591d5ab33 51 {
be_bryan 0:b74591d5ab33 52 memset( ctx, 0, sizeof( mbedtls_ssl_ticket_context ) );
be_bryan 0:b74591d5ab33 53
be_bryan 0:b74591d5ab33 54 #if defined(MBEDTLS_THREADING_C)
be_bryan 0:b74591d5ab33 55 mbedtls_mutex_init( &ctx->mutex );
be_bryan 0:b74591d5ab33 56 #endif
be_bryan 0:b74591d5ab33 57 }
be_bryan 0:b74591d5ab33 58
be_bryan 0:b74591d5ab33 59 #define MAX_KEY_BYTES 32 /* 256 bits */
be_bryan 0:b74591d5ab33 60
be_bryan 0:b74591d5ab33 61 /*
be_bryan 0:b74591d5ab33 62 * Generate/update a key
be_bryan 0:b74591d5ab33 63 */
be_bryan 0:b74591d5ab33 64 static int ssl_ticket_gen_key( mbedtls_ssl_ticket_context *ctx,
be_bryan 0:b74591d5ab33 65 unsigned char index )
be_bryan 0:b74591d5ab33 66 {
be_bryan 0:b74591d5ab33 67 int ret;
be_bryan 0:b74591d5ab33 68 unsigned char buf[MAX_KEY_BYTES];
be_bryan 0:b74591d5ab33 69 mbedtls_ssl_ticket_key *key = ctx->keys + index;
be_bryan 0:b74591d5ab33 70
be_bryan 0:b74591d5ab33 71 #if defined(MBEDTLS_HAVE_TIME)
be_bryan 0:b74591d5ab33 72 key->generation_time = (uint32_t) mbedtls_time( NULL );
be_bryan 0:b74591d5ab33 73 #endif
be_bryan 0:b74591d5ab33 74
be_bryan 0:b74591d5ab33 75 if( ( ret = ctx->f_rng( ctx->p_rng, key->name, sizeof( key->name ) ) ) != 0 )
be_bryan 0:b74591d5ab33 76 return( ret );
be_bryan 0:b74591d5ab33 77
be_bryan 0:b74591d5ab33 78 if( ( ret = ctx->f_rng( ctx->p_rng, buf, sizeof( buf ) ) ) != 0 )
be_bryan 0:b74591d5ab33 79 return( ret );
be_bryan 0:b74591d5ab33 80
be_bryan 0:b74591d5ab33 81 /* With GCM and CCM, same context can encrypt & decrypt */
be_bryan 0:b74591d5ab33 82 ret = mbedtls_cipher_setkey( &key->ctx, buf,
be_bryan 0:b74591d5ab33 83 mbedtls_cipher_get_key_bitlen( &key->ctx ),
be_bryan 0:b74591d5ab33 84 MBEDTLS_ENCRYPT );
be_bryan 0:b74591d5ab33 85
be_bryan 0:b74591d5ab33 86 mbedtls_zeroize( buf, sizeof( buf ) );
be_bryan 0:b74591d5ab33 87
be_bryan 0:b74591d5ab33 88 return( ret );
be_bryan 0:b74591d5ab33 89 }
be_bryan 0:b74591d5ab33 90
be_bryan 0:b74591d5ab33 91 /*
be_bryan 0:b74591d5ab33 92 * Rotate/generate keys if necessary
be_bryan 0:b74591d5ab33 93 */
be_bryan 0:b74591d5ab33 94 static int ssl_ticket_update_keys( mbedtls_ssl_ticket_context *ctx )
be_bryan 0:b74591d5ab33 95 {
be_bryan 0:b74591d5ab33 96 #if !defined(MBEDTLS_HAVE_TIME)
be_bryan 0:b74591d5ab33 97 ((void) ctx);
be_bryan 0:b74591d5ab33 98 #else
be_bryan 0:b74591d5ab33 99 if( ctx->ticket_lifetime != 0 )
be_bryan 0:b74591d5ab33 100 {
be_bryan 0:b74591d5ab33 101 uint32_t current_time = (uint32_t) mbedtls_time( NULL );
be_bryan 0:b74591d5ab33 102 uint32_t key_time = ctx->keys[ctx->active].generation_time;
be_bryan 0:b74591d5ab33 103
be_bryan 0:b74591d5ab33 104 if( current_time > key_time &&
be_bryan 0:b74591d5ab33 105 current_time - key_time < ctx->ticket_lifetime )
be_bryan 0:b74591d5ab33 106 {
be_bryan 0:b74591d5ab33 107 return( 0 );
be_bryan 0:b74591d5ab33 108 }
be_bryan 0:b74591d5ab33 109
be_bryan 0:b74591d5ab33 110 ctx->active = 1 - ctx->active;
be_bryan 0:b74591d5ab33 111
be_bryan 0:b74591d5ab33 112 return( ssl_ticket_gen_key( ctx, ctx->active ) );
be_bryan 0:b74591d5ab33 113 }
be_bryan 0:b74591d5ab33 114 else
be_bryan 0:b74591d5ab33 115 #endif /* MBEDTLS_HAVE_TIME */
be_bryan 0:b74591d5ab33 116 return( 0 );
be_bryan 0:b74591d5ab33 117 }
be_bryan 0:b74591d5ab33 118
be_bryan 0:b74591d5ab33 119 /*
be_bryan 0:b74591d5ab33 120 * Setup context for actual use
be_bryan 0:b74591d5ab33 121 */
be_bryan 0:b74591d5ab33 122 int mbedtls_ssl_ticket_setup( mbedtls_ssl_ticket_context *ctx,
be_bryan 0:b74591d5ab33 123 int (*f_rng)(void *, unsigned char *, size_t), void *p_rng,
be_bryan 0:b74591d5ab33 124 mbedtls_cipher_type_t cipher,
be_bryan 0:b74591d5ab33 125 uint32_t lifetime )
be_bryan 0:b74591d5ab33 126 {
be_bryan 0:b74591d5ab33 127 int ret;
be_bryan 0:b74591d5ab33 128 const mbedtls_cipher_info_t *cipher_info;
be_bryan 0:b74591d5ab33 129
be_bryan 0:b74591d5ab33 130 ctx->f_rng = f_rng;
be_bryan 0:b74591d5ab33 131 ctx->p_rng = p_rng;
be_bryan 0:b74591d5ab33 132
be_bryan 0:b74591d5ab33 133 ctx->ticket_lifetime = lifetime;
be_bryan 0:b74591d5ab33 134
be_bryan 0:b74591d5ab33 135 cipher_info = mbedtls_cipher_info_from_type( cipher);
be_bryan 0:b74591d5ab33 136 if( cipher_info == NULL )
be_bryan 0:b74591d5ab33 137 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
be_bryan 0:b74591d5ab33 138
be_bryan 0:b74591d5ab33 139 if( cipher_info->mode != MBEDTLS_MODE_GCM &&
be_bryan 0:b74591d5ab33 140 cipher_info->mode != MBEDTLS_MODE_CCM )
be_bryan 0:b74591d5ab33 141 {
be_bryan 0:b74591d5ab33 142 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
be_bryan 0:b74591d5ab33 143 }
be_bryan 0:b74591d5ab33 144
be_bryan 0:b74591d5ab33 145 if( cipher_info->key_bitlen > 8 * MAX_KEY_BYTES )
be_bryan 0:b74591d5ab33 146 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
be_bryan 0:b74591d5ab33 147
be_bryan 0:b74591d5ab33 148 if( ( ret = mbedtls_cipher_setup( &ctx->keys[0].ctx, cipher_info ) ) != 0 ||
be_bryan 0:b74591d5ab33 149 ( ret = mbedtls_cipher_setup( &ctx->keys[1].ctx, cipher_info ) ) != 0 )
be_bryan 0:b74591d5ab33 150 {
be_bryan 0:b74591d5ab33 151 return( ret );
be_bryan 0:b74591d5ab33 152 }
be_bryan 0:b74591d5ab33 153
be_bryan 0:b74591d5ab33 154 if( ( ret = ssl_ticket_gen_key( ctx, 0 ) ) != 0 ||
be_bryan 0:b74591d5ab33 155 ( ret = ssl_ticket_gen_key( ctx, 1 ) ) != 0 )
be_bryan 0:b74591d5ab33 156 {
be_bryan 0:b74591d5ab33 157 return( ret );
be_bryan 0:b74591d5ab33 158 }
be_bryan 0:b74591d5ab33 159
be_bryan 0:b74591d5ab33 160 return( 0 );
be_bryan 0:b74591d5ab33 161 }
be_bryan 0:b74591d5ab33 162
be_bryan 0:b74591d5ab33 163 /*
be_bryan 0:b74591d5ab33 164 * Serialize a session in the following format:
be_bryan 0:b74591d5ab33 165 * 0 . n-1 session structure, n = sizeof(mbedtls_ssl_session)
be_bryan 0:b74591d5ab33 166 * n . n+2 peer_cert length = m (0 if no certificate)
be_bryan 0:b74591d5ab33 167 * n+3 . n+2+m peer cert ASN.1
be_bryan 0:b74591d5ab33 168 */
be_bryan 0:b74591d5ab33 169 static int ssl_save_session( const mbedtls_ssl_session *session,
be_bryan 0:b74591d5ab33 170 unsigned char *buf, size_t buf_len,
be_bryan 0:b74591d5ab33 171 size_t *olen )
be_bryan 0:b74591d5ab33 172 {
be_bryan 0:b74591d5ab33 173 unsigned char *p = buf;
be_bryan 0:b74591d5ab33 174 size_t left = buf_len;
be_bryan 0:b74591d5ab33 175 #if defined(MBEDTLS_X509_CRT_PARSE_C)
be_bryan 0:b74591d5ab33 176 size_t cert_len;
be_bryan 0:b74591d5ab33 177 #endif /* MBEDTLS_X509_CRT_PARSE_C */
be_bryan 0:b74591d5ab33 178
be_bryan 0:b74591d5ab33 179 if( left < sizeof( mbedtls_ssl_session ) )
be_bryan 0:b74591d5ab33 180 return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
be_bryan 0:b74591d5ab33 181
be_bryan 0:b74591d5ab33 182 memcpy( p, session, sizeof( mbedtls_ssl_session ) );
be_bryan 0:b74591d5ab33 183 p += sizeof( mbedtls_ssl_session );
be_bryan 0:b74591d5ab33 184 left -= sizeof( mbedtls_ssl_session );
be_bryan 0:b74591d5ab33 185
be_bryan 0:b74591d5ab33 186 #if defined(MBEDTLS_X509_CRT_PARSE_C)
be_bryan 0:b74591d5ab33 187 if( session->peer_cert == NULL )
be_bryan 0:b74591d5ab33 188 cert_len = 0;
be_bryan 0:b74591d5ab33 189 else
be_bryan 0:b74591d5ab33 190 cert_len = session->peer_cert->raw.len;
be_bryan 0:b74591d5ab33 191
be_bryan 0:b74591d5ab33 192 if( left < 3 + cert_len )
be_bryan 0:b74591d5ab33 193 return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
be_bryan 0:b74591d5ab33 194
be_bryan 0:b74591d5ab33 195 *p++ = (unsigned char)( cert_len >> 16 & 0xFF );
be_bryan 0:b74591d5ab33 196 *p++ = (unsigned char)( cert_len >> 8 & 0xFF );
be_bryan 0:b74591d5ab33 197 *p++ = (unsigned char)( cert_len & 0xFF );
be_bryan 0:b74591d5ab33 198
be_bryan 0:b74591d5ab33 199 if( session->peer_cert != NULL )
be_bryan 0:b74591d5ab33 200 memcpy( p, session->peer_cert->raw.p, cert_len );
be_bryan 0:b74591d5ab33 201
be_bryan 0:b74591d5ab33 202 p += cert_len;
be_bryan 0:b74591d5ab33 203 #endif /* MBEDTLS_X509_CRT_PARSE_C */
be_bryan 0:b74591d5ab33 204
be_bryan 0:b74591d5ab33 205 *olen = p - buf;
be_bryan 0:b74591d5ab33 206
be_bryan 0:b74591d5ab33 207 return( 0 );
be_bryan 0:b74591d5ab33 208 }
be_bryan 0:b74591d5ab33 209
be_bryan 0:b74591d5ab33 210 /*
be_bryan 0:b74591d5ab33 211 * Unserialise session, see ssl_save_session()
be_bryan 0:b74591d5ab33 212 */
be_bryan 0:b74591d5ab33 213 static int ssl_load_session( mbedtls_ssl_session *session,
be_bryan 0:b74591d5ab33 214 const unsigned char *buf, size_t len )
be_bryan 0:b74591d5ab33 215 {
be_bryan 0:b74591d5ab33 216 const unsigned char *p = buf;
be_bryan 0:b74591d5ab33 217 const unsigned char * const end = buf + len;
be_bryan 0:b74591d5ab33 218 #if defined(MBEDTLS_X509_CRT_PARSE_C)
be_bryan 0:b74591d5ab33 219 size_t cert_len;
be_bryan 0:b74591d5ab33 220 #endif /* MBEDTLS_X509_CRT_PARSE_C */
be_bryan 0:b74591d5ab33 221
be_bryan 0:b74591d5ab33 222 if( p + sizeof( mbedtls_ssl_session ) > end )
be_bryan 0:b74591d5ab33 223 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
be_bryan 0:b74591d5ab33 224
be_bryan 0:b74591d5ab33 225 memcpy( session, p, sizeof( mbedtls_ssl_session ) );
be_bryan 0:b74591d5ab33 226 p += sizeof( mbedtls_ssl_session );
be_bryan 0:b74591d5ab33 227
be_bryan 0:b74591d5ab33 228 #if defined(MBEDTLS_X509_CRT_PARSE_C)
be_bryan 0:b74591d5ab33 229 if( p + 3 > end )
be_bryan 0:b74591d5ab33 230 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
be_bryan 0:b74591d5ab33 231
be_bryan 0:b74591d5ab33 232 cert_len = ( p[0] << 16 ) | ( p[1] << 8 ) | p[2];
be_bryan 0:b74591d5ab33 233 p += 3;
be_bryan 0:b74591d5ab33 234
be_bryan 0:b74591d5ab33 235 if( cert_len == 0 )
be_bryan 0:b74591d5ab33 236 {
be_bryan 0:b74591d5ab33 237 session->peer_cert = NULL;
be_bryan 0:b74591d5ab33 238 }
be_bryan 0:b74591d5ab33 239 else
be_bryan 0:b74591d5ab33 240 {
be_bryan 0:b74591d5ab33 241 int ret;
be_bryan 0:b74591d5ab33 242
be_bryan 0:b74591d5ab33 243 if( p + cert_len > end )
be_bryan 0:b74591d5ab33 244 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
be_bryan 0:b74591d5ab33 245
be_bryan 0:b74591d5ab33 246 session->peer_cert = mbedtls_calloc( 1, sizeof( mbedtls_x509_crt ) );
be_bryan 0:b74591d5ab33 247
be_bryan 0:b74591d5ab33 248 if( session->peer_cert == NULL )
be_bryan 0:b74591d5ab33 249 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
be_bryan 0:b74591d5ab33 250
be_bryan 0:b74591d5ab33 251 mbedtls_x509_crt_init( session->peer_cert );
be_bryan 0:b74591d5ab33 252
be_bryan 0:b74591d5ab33 253 if( ( ret = mbedtls_x509_crt_parse_der( session->peer_cert,
be_bryan 0:b74591d5ab33 254 p, cert_len ) ) != 0 )
be_bryan 0:b74591d5ab33 255 {
be_bryan 0:b74591d5ab33 256 mbedtls_x509_crt_free( session->peer_cert );
be_bryan 0:b74591d5ab33 257 mbedtls_free( session->peer_cert );
be_bryan 0:b74591d5ab33 258 session->peer_cert = NULL;
be_bryan 0:b74591d5ab33 259 return( ret );
be_bryan 0:b74591d5ab33 260 }
be_bryan 0:b74591d5ab33 261
be_bryan 0:b74591d5ab33 262 p += cert_len;
be_bryan 0:b74591d5ab33 263 }
be_bryan 0:b74591d5ab33 264 #endif /* MBEDTLS_X509_CRT_PARSE_C */
be_bryan 0:b74591d5ab33 265
be_bryan 0:b74591d5ab33 266 if( p != end )
be_bryan 0:b74591d5ab33 267 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
be_bryan 0:b74591d5ab33 268
be_bryan 0:b74591d5ab33 269 return( 0 );
be_bryan 0:b74591d5ab33 270 }
be_bryan 0:b74591d5ab33 271
be_bryan 0:b74591d5ab33 272 /*
be_bryan 0:b74591d5ab33 273 * Create session ticket, with the following structure:
be_bryan 0:b74591d5ab33 274 *
be_bryan 0:b74591d5ab33 275 * struct {
be_bryan 0:b74591d5ab33 276 * opaque key_name[4];
be_bryan 0:b74591d5ab33 277 * opaque iv[12];
be_bryan 0:b74591d5ab33 278 * opaque encrypted_state<0..2^16-1>;
be_bryan 0:b74591d5ab33 279 * opaque tag[16];
be_bryan 0:b74591d5ab33 280 * } ticket;
be_bryan 0:b74591d5ab33 281 *
be_bryan 0:b74591d5ab33 282 * The key_name, iv, and length of encrypted_state are the additional
be_bryan 0:b74591d5ab33 283 * authenticated data.
be_bryan 0:b74591d5ab33 284 */
be_bryan 0:b74591d5ab33 285 int mbedtls_ssl_ticket_write( void *p_ticket,
be_bryan 0:b74591d5ab33 286 const mbedtls_ssl_session *session,
be_bryan 0:b74591d5ab33 287 unsigned char *start,
be_bryan 0:b74591d5ab33 288 const unsigned char *end,
be_bryan 0:b74591d5ab33 289 size_t *tlen,
be_bryan 0:b74591d5ab33 290 uint32_t *ticket_lifetime )
be_bryan 0:b74591d5ab33 291 {
be_bryan 0:b74591d5ab33 292 int ret;
be_bryan 0:b74591d5ab33 293 mbedtls_ssl_ticket_context *ctx = p_ticket;
be_bryan 0:b74591d5ab33 294 mbedtls_ssl_ticket_key *key;
be_bryan 0:b74591d5ab33 295 unsigned char *key_name = start;
be_bryan 0:b74591d5ab33 296 unsigned char *iv = start + 4;
be_bryan 0:b74591d5ab33 297 unsigned char *state_len_bytes = iv + 12;
be_bryan 0:b74591d5ab33 298 unsigned char *state = state_len_bytes + 2;
be_bryan 0:b74591d5ab33 299 unsigned char *tag;
be_bryan 0:b74591d5ab33 300 size_t clear_len, ciph_len;
be_bryan 0:b74591d5ab33 301
be_bryan 0:b74591d5ab33 302 *tlen = 0;
be_bryan 0:b74591d5ab33 303
be_bryan 0:b74591d5ab33 304 if( ctx == NULL || ctx->f_rng == NULL )
be_bryan 0:b74591d5ab33 305 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
be_bryan 0:b74591d5ab33 306
be_bryan 0:b74591d5ab33 307 /* We need at least 4 bytes for key_name, 12 for IV, 2 for len 16 for tag,
be_bryan 0:b74591d5ab33 308 * in addition to session itself, that will be checked when writing it. */
be_bryan 0:b74591d5ab33 309 if( end - start < 4 + 12 + 2 + 16 )
be_bryan 0:b74591d5ab33 310 return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
be_bryan 0:b74591d5ab33 311
be_bryan 0:b74591d5ab33 312 #if defined(MBEDTLS_THREADING_C)
be_bryan 0:b74591d5ab33 313 if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
be_bryan 0:b74591d5ab33 314 return( ret );
be_bryan 0:b74591d5ab33 315 #endif
be_bryan 0:b74591d5ab33 316
be_bryan 0:b74591d5ab33 317 if( ( ret = ssl_ticket_update_keys( ctx ) ) != 0 )
be_bryan 0:b74591d5ab33 318 goto cleanup;
be_bryan 0:b74591d5ab33 319
be_bryan 0:b74591d5ab33 320 key = &ctx->keys[ctx->active];
be_bryan 0:b74591d5ab33 321
be_bryan 0:b74591d5ab33 322 *ticket_lifetime = ctx->ticket_lifetime;
be_bryan 0:b74591d5ab33 323
be_bryan 0:b74591d5ab33 324 memcpy( key_name, key->name, 4 );
be_bryan 0:b74591d5ab33 325
be_bryan 0:b74591d5ab33 326 if( ( ret = ctx->f_rng( ctx->p_rng, iv, 12 ) ) != 0 )
be_bryan 0:b74591d5ab33 327 goto cleanup;
be_bryan 0:b74591d5ab33 328
be_bryan 0:b74591d5ab33 329 /* Dump session state */
be_bryan 0:b74591d5ab33 330 if( ( ret = ssl_save_session( session,
be_bryan 0:b74591d5ab33 331 state, end - state, &clear_len ) ) != 0 ||
be_bryan 0:b74591d5ab33 332 (unsigned long) clear_len > 65535 )
be_bryan 0:b74591d5ab33 333 {
be_bryan 0:b74591d5ab33 334 goto cleanup;
be_bryan 0:b74591d5ab33 335 }
be_bryan 0:b74591d5ab33 336 state_len_bytes[0] = ( clear_len >> 8 ) & 0xff;
be_bryan 0:b74591d5ab33 337 state_len_bytes[1] = ( clear_len ) & 0xff;
be_bryan 0:b74591d5ab33 338
be_bryan 0:b74591d5ab33 339 /* Encrypt and authenticate */
be_bryan 0:b74591d5ab33 340 tag = state + clear_len;
be_bryan 0:b74591d5ab33 341 if( ( ret = mbedtls_cipher_auth_encrypt( &key->ctx,
be_bryan 0:b74591d5ab33 342 iv, 12, key_name, 4 + 12 + 2,
be_bryan 0:b74591d5ab33 343 state, clear_len, state, &ciph_len, tag, 16 ) ) != 0 )
be_bryan 0:b74591d5ab33 344 {
be_bryan 0:b74591d5ab33 345 goto cleanup;
be_bryan 0:b74591d5ab33 346 }
be_bryan 0:b74591d5ab33 347 if( ciph_len != clear_len )
be_bryan 0:b74591d5ab33 348 {
be_bryan 0:b74591d5ab33 349 ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR;
be_bryan 0:b74591d5ab33 350 goto cleanup;
be_bryan 0:b74591d5ab33 351 }
be_bryan 0:b74591d5ab33 352
be_bryan 0:b74591d5ab33 353 *tlen = 4 + 12 + 2 + 16 + ciph_len;
be_bryan 0:b74591d5ab33 354
be_bryan 0:b74591d5ab33 355 cleanup:
be_bryan 0:b74591d5ab33 356 #if defined(MBEDTLS_THREADING_C)
be_bryan 0:b74591d5ab33 357 if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
be_bryan 0:b74591d5ab33 358 return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
be_bryan 0:b74591d5ab33 359 #endif
be_bryan 0:b74591d5ab33 360
be_bryan 0:b74591d5ab33 361 return( ret );
be_bryan 0:b74591d5ab33 362 }
be_bryan 0:b74591d5ab33 363
be_bryan 0:b74591d5ab33 364 /*
be_bryan 0:b74591d5ab33 365 * Select key based on name
be_bryan 0:b74591d5ab33 366 */
be_bryan 0:b74591d5ab33 367 static mbedtls_ssl_ticket_key *ssl_ticket_select_key(
be_bryan 0:b74591d5ab33 368 mbedtls_ssl_ticket_context *ctx,
be_bryan 0:b74591d5ab33 369 const unsigned char name[4] )
be_bryan 0:b74591d5ab33 370 {
be_bryan 0:b74591d5ab33 371 unsigned char i;
be_bryan 0:b74591d5ab33 372
be_bryan 0:b74591d5ab33 373 for( i = 0; i < sizeof( ctx->keys ) / sizeof( *ctx->keys ); i++ )
be_bryan 0:b74591d5ab33 374 if( memcmp( name, ctx->keys[i].name, 4 ) == 0 )
be_bryan 0:b74591d5ab33 375 return( &ctx->keys[i] );
be_bryan 0:b74591d5ab33 376
be_bryan 0:b74591d5ab33 377 return( NULL );
be_bryan 0:b74591d5ab33 378 }
be_bryan 0:b74591d5ab33 379
be_bryan 0:b74591d5ab33 380 /*
be_bryan 0:b74591d5ab33 381 * Load session ticket (see mbedtls_ssl_ticket_write for structure)
be_bryan 0:b74591d5ab33 382 */
be_bryan 0:b74591d5ab33 383 int mbedtls_ssl_ticket_parse( void *p_ticket,
be_bryan 0:b74591d5ab33 384 mbedtls_ssl_session *session,
be_bryan 0:b74591d5ab33 385 unsigned char *buf,
be_bryan 0:b74591d5ab33 386 size_t len )
be_bryan 0:b74591d5ab33 387 {
be_bryan 0:b74591d5ab33 388 int ret;
be_bryan 0:b74591d5ab33 389 mbedtls_ssl_ticket_context *ctx = p_ticket;
be_bryan 0:b74591d5ab33 390 mbedtls_ssl_ticket_key *key;
be_bryan 0:b74591d5ab33 391 unsigned char *key_name = buf;
be_bryan 0:b74591d5ab33 392 unsigned char *iv = buf + 4;
be_bryan 0:b74591d5ab33 393 unsigned char *enc_len_p = iv + 12;
be_bryan 0:b74591d5ab33 394 unsigned char *ticket = enc_len_p + 2;
be_bryan 0:b74591d5ab33 395 unsigned char *tag;
be_bryan 0:b74591d5ab33 396 size_t enc_len, clear_len;
be_bryan 0:b74591d5ab33 397
be_bryan 0:b74591d5ab33 398 if( ctx == NULL || ctx->f_rng == NULL )
be_bryan 0:b74591d5ab33 399 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
be_bryan 0:b74591d5ab33 400
be_bryan 0:b74591d5ab33 401 /* See mbedtls_ssl_ticket_write() */
be_bryan 0:b74591d5ab33 402 if( len < 4 + 12 + 2 + 16 )
be_bryan 0:b74591d5ab33 403 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
be_bryan 0:b74591d5ab33 404
be_bryan 0:b74591d5ab33 405 #if defined(MBEDTLS_THREADING_C)
be_bryan 0:b74591d5ab33 406 if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
be_bryan 0:b74591d5ab33 407 return( ret );
be_bryan 0:b74591d5ab33 408 #endif
be_bryan 0:b74591d5ab33 409
be_bryan 0:b74591d5ab33 410 if( ( ret = ssl_ticket_update_keys( ctx ) ) != 0 )
be_bryan 0:b74591d5ab33 411 goto cleanup;
be_bryan 0:b74591d5ab33 412
be_bryan 0:b74591d5ab33 413 enc_len = ( enc_len_p[0] << 8 ) | enc_len_p[1];
be_bryan 0:b74591d5ab33 414 tag = ticket + enc_len;
be_bryan 0:b74591d5ab33 415
be_bryan 0:b74591d5ab33 416 if( len != 4 + 12 + 2 + enc_len + 16 )
be_bryan 0:b74591d5ab33 417 {
be_bryan 0:b74591d5ab33 418 ret = MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
be_bryan 0:b74591d5ab33 419 goto cleanup;
be_bryan 0:b74591d5ab33 420 }
be_bryan 0:b74591d5ab33 421
be_bryan 0:b74591d5ab33 422 /* Select key */
be_bryan 0:b74591d5ab33 423 if( ( key = ssl_ticket_select_key( ctx, key_name ) ) == NULL )
be_bryan 0:b74591d5ab33 424 {
be_bryan 0:b74591d5ab33 425 /* We can't know for sure but this is a likely option unless we're
be_bryan 0:b74591d5ab33 426 * under attack - this is only informative anyway */
be_bryan 0:b74591d5ab33 427 ret = MBEDTLS_ERR_SSL_SESSION_TICKET_EXPIRED;
be_bryan 0:b74591d5ab33 428 goto cleanup;
be_bryan 0:b74591d5ab33 429 }
be_bryan 0:b74591d5ab33 430
be_bryan 0:b74591d5ab33 431 /* Decrypt and authenticate */
be_bryan 0:b74591d5ab33 432 if( ( ret = mbedtls_cipher_auth_decrypt( &key->ctx, iv, 12,
be_bryan 0:b74591d5ab33 433 key_name, 4 + 12 + 2, ticket, enc_len,
be_bryan 0:b74591d5ab33 434 ticket, &clear_len, tag, 16 ) ) != 0 )
be_bryan 0:b74591d5ab33 435 {
be_bryan 0:b74591d5ab33 436 if( ret == MBEDTLS_ERR_CIPHER_AUTH_FAILED )
be_bryan 0:b74591d5ab33 437 ret = MBEDTLS_ERR_SSL_INVALID_MAC;
be_bryan 0:b74591d5ab33 438
be_bryan 0:b74591d5ab33 439 goto cleanup;
be_bryan 0:b74591d5ab33 440 }
be_bryan 0:b74591d5ab33 441 if( clear_len != enc_len )
be_bryan 0:b74591d5ab33 442 {
be_bryan 0:b74591d5ab33 443 ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR;
be_bryan 0:b74591d5ab33 444 goto cleanup;
be_bryan 0:b74591d5ab33 445 }
be_bryan 0:b74591d5ab33 446
be_bryan 0:b74591d5ab33 447 /* Actually load session */
be_bryan 0:b74591d5ab33 448 if( ( ret = ssl_load_session( session, ticket, clear_len ) ) != 0 )
be_bryan 0:b74591d5ab33 449 goto cleanup;
be_bryan 0:b74591d5ab33 450
be_bryan 0:b74591d5ab33 451 #if defined(MBEDTLS_HAVE_TIME)
be_bryan 0:b74591d5ab33 452 {
be_bryan 0:b74591d5ab33 453 /* Check for expiration */
be_bryan 0:b74591d5ab33 454 mbedtls_time_t current_time = mbedtls_time( NULL );
be_bryan 0:b74591d5ab33 455
be_bryan 0:b74591d5ab33 456 if( current_time < session->start ||
be_bryan 0:b74591d5ab33 457 (uint32_t)( current_time - session->start ) > ctx->ticket_lifetime )
be_bryan 0:b74591d5ab33 458 {
be_bryan 0:b74591d5ab33 459 ret = MBEDTLS_ERR_SSL_SESSION_TICKET_EXPIRED;
be_bryan 0:b74591d5ab33 460 goto cleanup;
be_bryan 0:b74591d5ab33 461 }
be_bryan 0:b74591d5ab33 462 }
be_bryan 0:b74591d5ab33 463 #endif
be_bryan 0:b74591d5ab33 464
be_bryan 0:b74591d5ab33 465 cleanup:
be_bryan 0:b74591d5ab33 466 #if defined(MBEDTLS_THREADING_C)
be_bryan 0:b74591d5ab33 467 if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
be_bryan 0:b74591d5ab33 468 return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
be_bryan 0:b74591d5ab33 469 #endif
be_bryan 0:b74591d5ab33 470
be_bryan 0:b74591d5ab33 471 return( ret );
be_bryan 0:b74591d5ab33 472 }
be_bryan 0:b74591d5ab33 473
be_bryan 0:b74591d5ab33 474 /*
be_bryan 0:b74591d5ab33 475 * Free context
be_bryan 0:b74591d5ab33 476 */
be_bryan 0:b74591d5ab33 477 void mbedtls_ssl_ticket_free( mbedtls_ssl_ticket_context *ctx )
be_bryan 0:b74591d5ab33 478 {
be_bryan 0:b74591d5ab33 479 mbedtls_cipher_free( &ctx->keys[0].ctx );
be_bryan 0:b74591d5ab33 480 mbedtls_cipher_free( &ctx->keys[1].ctx );
be_bryan 0:b74591d5ab33 481
be_bryan 0:b74591d5ab33 482 #if defined(MBEDTLS_THREADING_C)
be_bryan 0:b74591d5ab33 483 mbedtls_mutex_free( &ctx->mutex );
be_bryan 0:b74591d5ab33 484 #endif
be_bryan 0:b74591d5ab33 485
be_bryan 0:b74591d5ab33 486 mbedtls_zeroize( ctx, sizeof( mbedtls_ssl_ticket_context ) );
be_bryan 0:b74591d5ab33 487 }
be_bryan 0:b74591d5ab33 488
be_bryan 0:b74591d5ab33 489 #endif /* MBEDTLS_SSL_TICKET_C */