Maxim nexpaq / nexpaq_dev

Preliminary main mbed library for nexpaq development

features/mbedtls/src/ssl_ticket.c@0:6c56fb4bc5f0, 2016-11-04 (annotated)

Committer:
nexpaq
Date:
Fri Nov 04 20:27:58 2016 +0000
Revision:
0:6c56fb4bc5f0
Moving to library for sharing updates

Who changed what in which revision?

UserRevisionLine numberNew contents of line
nexpaq 0:6c56fb4bc5f0 1 /*
nexpaq 0:6c56fb4bc5f0 2 * TLS server tickets callbacks implementation
nexpaq 0:6c56fb4bc5f0 3 *
nexpaq 0:6c56fb4bc5f0 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
nexpaq 0:6c56fb4bc5f0 5 * SPDX-License-Identifier: Apache-2.0
nexpaq 0:6c56fb4bc5f0 6 *
nexpaq 0:6c56fb4bc5f0 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
nexpaq 0:6c56fb4bc5f0 8 * not use this file except in compliance with the License.
nexpaq 0:6c56fb4bc5f0 9 * You may obtain a copy of the License at
nexpaq 0:6c56fb4bc5f0 10 *
nexpaq 0:6c56fb4bc5f0 11 * http://www.apache.org/licenses/LICENSE-2.0
nexpaq 0:6c56fb4bc5f0 12 *
nexpaq 0:6c56fb4bc5f0 13 * Unless required by applicable law or agreed to in writing, software
nexpaq 0:6c56fb4bc5f0 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
nexpaq 0:6c56fb4bc5f0 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
nexpaq 0:6c56fb4bc5f0 16 * See the License for the specific language governing permissions and
nexpaq 0:6c56fb4bc5f0 17 * limitations under the License.
nexpaq 0:6c56fb4bc5f0 18 *
nexpaq 0:6c56fb4bc5f0 19 * This file is part of mbed TLS (https://tls.mbed.org)
nexpaq 0:6c56fb4bc5f0 20 */
nexpaq 0:6c56fb4bc5f0 21
nexpaq 0:6c56fb4bc5f0 22 #if !defined(MBEDTLS_CONFIG_FILE)
nexpaq 0:6c56fb4bc5f0 23 #include "mbedtls/config.h"
nexpaq 0:6c56fb4bc5f0 24 #else
nexpaq 0:6c56fb4bc5f0 25 #include MBEDTLS_CONFIG_FILE
nexpaq 0:6c56fb4bc5f0 26 #endif
nexpaq 0:6c56fb4bc5f0 27
nexpaq 0:6c56fb4bc5f0 28 #if defined(MBEDTLS_SSL_TICKET_C)
nexpaq 0:6c56fb4bc5f0 29
nexpaq 0:6c56fb4bc5f0 30 #if defined(MBEDTLS_PLATFORM_C)
nexpaq 0:6c56fb4bc5f0 31 #include "mbedtls/platform.h"
nexpaq 0:6c56fb4bc5f0 32 #else
nexpaq 0:6c56fb4bc5f0 33 #include <stdlib.h>
nexpaq 0:6c56fb4bc5f0 34 #define mbedtls_calloc calloc
nexpaq 0:6c56fb4bc5f0 35 #define mbedtls_free free
nexpaq 0:6c56fb4bc5f0 36 #define mbedtls_time time
nexpaq 0:6c56fb4bc5f0 37 #define mbedtls_time_t time_t
nexpaq 0:6c56fb4bc5f0 38 #endif
nexpaq 0:6c56fb4bc5f0 39
nexpaq 0:6c56fb4bc5f0 40 #include "mbedtls/ssl_ticket.h"
nexpaq 0:6c56fb4bc5f0 41
nexpaq 0:6c56fb4bc5f0 42 #include <string.h>
nexpaq 0:6c56fb4bc5f0 43
nexpaq 0:6c56fb4bc5f0 44 /* Implementation that should never be optimized out by the compiler */
nexpaq 0:6c56fb4bc5f0 45 static void mbedtls_zeroize( void *v, size_t n ) {
nexpaq 0:6c56fb4bc5f0 46 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
nexpaq 0:6c56fb4bc5f0 47 }
nexpaq 0:6c56fb4bc5f0 48
nexpaq 0:6c56fb4bc5f0 49 /*
nexpaq 0:6c56fb4bc5f0 50 * Initialze context
nexpaq 0:6c56fb4bc5f0 51 */
nexpaq 0:6c56fb4bc5f0 52 void mbedtls_ssl_ticket_init( mbedtls_ssl_ticket_context *ctx )
nexpaq 0:6c56fb4bc5f0 53 {
nexpaq 0:6c56fb4bc5f0 54 memset( ctx, 0, sizeof( mbedtls_ssl_ticket_context ) );
nexpaq 0:6c56fb4bc5f0 55
nexpaq 0:6c56fb4bc5f0 56 #if defined(MBEDTLS_THREADING_C)
nexpaq 0:6c56fb4bc5f0 57 mbedtls_mutex_init( &ctx->mutex );
nexpaq 0:6c56fb4bc5f0 58 #endif
nexpaq 0:6c56fb4bc5f0 59 }
nexpaq 0:6c56fb4bc5f0 60
nexpaq 0:6c56fb4bc5f0 61 #define MAX_KEY_BYTES 32 /* 256 bits */
nexpaq 0:6c56fb4bc5f0 62
nexpaq 0:6c56fb4bc5f0 63 /*
nexpaq 0:6c56fb4bc5f0 64 * Generate/update a key
nexpaq 0:6c56fb4bc5f0 65 */
nexpaq 0:6c56fb4bc5f0 66 static int ssl_ticket_gen_key( mbedtls_ssl_ticket_context *ctx,
nexpaq 0:6c56fb4bc5f0 67 unsigned char index )
nexpaq 0:6c56fb4bc5f0 68 {
nexpaq 0:6c56fb4bc5f0 69 int ret;
nexpaq 0:6c56fb4bc5f0 70 unsigned char buf[MAX_KEY_BYTES];
nexpaq 0:6c56fb4bc5f0 71 mbedtls_ssl_ticket_key *key = ctx->keys + index;
nexpaq 0:6c56fb4bc5f0 72
nexpaq 0:6c56fb4bc5f0 73 #if defined(MBEDTLS_HAVE_TIME)
nexpaq 0:6c56fb4bc5f0 74 key->generation_time = (uint32_t) mbedtls_time( NULL );
nexpaq 0:6c56fb4bc5f0 75 #endif
nexpaq 0:6c56fb4bc5f0 76
nexpaq 0:6c56fb4bc5f0 77 if( ( ret = ctx->f_rng( ctx->p_rng, key->name, sizeof( key->name ) ) ) != 0 )
nexpaq 0:6c56fb4bc5f0 78 return( ret );
nexpaq 0:6c56fb4bc5f0 79
nexpaq 0:6c56fb4bc5f0 80 if( ( ret = ctx->f_rng( ctx->p_rng, buf, sizeof( buf ) ) ) != 0 )
nexpaq 0:6c56fb4bc5f0 81 return( ret );
nexpaq 0:6c56fb4bc5f0 82
nexpaq 0:6c56fb4bc5f0 83 /* With GCM and CCM, same context can encrypt & decrypt */
nexpaq 0:6c56fb4bc5f0 84 ret = mbedtls_cipher_setkey( &key->ctx, buf,
nexpaq 0:6c56fb4bc5f0 85 mbedtls_cipher_get_key_bitlen( &key->ctx ),
nexpaq 0:6c56fb4bc5f0 86 MBEDTLS_ENCRYPT );
nexpaq 0:6c56fb4bc5f0 87
nexpaq 0:6c56fb4bc5f0 88 mbedtls_zeroize( buf, sizeof( buf ) );
nexpaq 0:6c56fb4bc5f0 89
nexpaq 0:6c56fb4bc5f0 90 return( ret );
nexpaq 0:6c56fb4bc5f0 91 }
nexpaq 0:6c56fb4bc5f0 92
nexpaq 0:6c56fb4bc5f0 93 /*
nexpaq 0:6c56fb4bc5f0 94 * Rotate/generate keys if necessary
nexpaq 0:6c56fb4bc5f0 95 */
nexpaq 0:6c56fb4bc5f0 96 static int ssl_ticket_update_keys( mbedtls_ssl_ticket_context *ctx )
nexpaq 0:6c56fb4bc5f0 97 {
nexpaq 0:6c56fb4bc5f0 98 #if !defined(MBEDTLS_HAVE_TIME)
nexpaq 0:6c56fb4bc5f0 99 ((void) ctx);
nexpaq 0:6c56fb4bc5f0 100 #else
nexpaq 0:6c56fb4bc5f0 101 if( ctx->ticket_lifetime != 0 )
nexpaq 0:6c56fb4bc5f0 102 {
nexpaq 0:6c56fb4bc5f0 103 uint32_t current_time = (uint32_t) mbedtls_time( NULL );
nexpaq 0:6c56fb4bc5f0 104 uint32_t key_time = ctx->keys[ctx->active].generation_time;
nexpaq 0:6c56fb4bc5f0 105
nexpaq 0:6c56fb4bc5f0 106 if( current_time > key_time &&
nexpaq 0:6c56fb4bc5f0 107 current_time - key_time < ctx->ticket_lifetime )
nexpaq 0:6c56fb4bc5f0 108 {
nexpaq 0:6c56fb4bc5f0 109 return( 0 );
nexpaq 0:6c56fb4bc5f0 110 }
nexpaq 0:6c56fb4bc5f0 111
nexpaq 0:6c56fb4bc5f0 112 ctx->active = 1 - ctx->active;
nexpaq 0:6c56fb4bc5f0 113
nexpaq 0:6c56fb4bc5f0 114 return( ssl_ticket_gen_key( ctx, ctx->active ) );
nexpaq 0:6c56fb4bc5f0 115 }
nexpaq 0:6c56fb4bc5f0 116 else
nexpaq 0:6c56fb4bc5f0 117 #endif /* MBEDTLS_HAVE_TIME */
nexpaq 0:6c56fb4bc5f0 118 return( 0 );
nexpaq 0:6c56fb4bc5f0 119 }
nexpaq 0:6c56fb4bc5f0 120
nexpaq 0:6c56fb4bc5f0 121 /*
nexpaq 0:6c56fb4bc5f0 122 * Setup context for actual use
nexpaq 0:6c56fb4bc5f0 123 */
nexpaq 0:6c56fb4bc5f0 124 int mbedtls_ssl_ticket_setup( mbedtls_ssl_ticket_context *ctx,
nexpaq 0:6c56fb4bc5f0 125 int (*f_rng)(void *, unsigned char *, size_t), void *p_rng,
nexpaq 0:6c56fb4bc5f0 126 mbedtls_cipher_type_t cipher,
nexpaq 0:6c56fb4bc5f0 127 uint32_t lifetime )
nexpaq 0:6c56fb4bc5f0 128 {
nexpaq 0:6c56fb4bc5f0 129 int ret;
nexpaq 0:6c56fb4bc5f0 130 const mbedtls_cipher_info_t *cipher_info;
nexpaq 0:6c56fb4bc5f0 131
nexpaq 0:6c56fb4bc5f0 132 ctx->f_rng = f_rng;
nexpaq 0:6c56fb4bc5f0 133 ctx->p_rng = p_rng;
nexpaq 0:6c56fb4bc5f0 134
nexpaq 0:6c56fb4bc5f0 135 ctx->ticket_lifetime = lifetime;
nexpaq 0:6c56fb4bc5f0 136
nexpaq 0:6c56fb4bc5f0 137 cipher_info = mbedtls_cipher_info_from_type( cipher);
nexpaq 0:6c56fb4bc5f0 138 if( cipher_info == NULL )
nexpaq 0:6c56fb4bc5f0 139 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
nexpaq 0:6c56fb4bc5f0 140
nexpaq 0:6c56fb4bc5f0 141 if( cipher_info->mode != MBEDTLS_MODE_GCM &&
nexpaq 0:6c56fb4bc5f0 142 cipher_info->mode != MBEDTLS_MODE_CCM )
nexpaq 0:6c56fb4bc5f0 143 {
nexpaq 0:6c56fb4bc5f0 144 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
nexpaq 0:6c56fb4bc5f0 145 }
nexpaq 0:6c56fb4bc5f0 146
nexpaq 0:6c56fb4bc5f0 147 if( cipher_info->key_bitlen > 8 * MAX_KEY_BYTES )
nexpaq 0:6c56fb4bc5f0 148 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
nexpaq 0:6c56fb4bc5f0 149
nexpaq 0:6c56fb4bc5f0 150 if( ( ret = mbedtls_cipher_setup( &ctx->keys[0].ctx, cipher_info ) ) != 0 ||
nexpaq 0:6c56fb4bc5f0 151 ( ret = mbedtls_cipher_setup( &ctx->keys[1].ctx, cipher_info ) ) != 0 )
nexpaq 0:6c56fb4bc5f0 152 {
nexpaq 0:6c56fb4bc5f0 153 return( ret );
nexpaq 0:6c56fb4bc5f0 154 }
nexpaq 0:6c56fb4bc5f0 155
nexpaq 0:6c56fb4bc5f0 156 if( ( ret = ssl_ticket_gen_key( ctx, 0 ) ) != 0 ||
nexpaq 0:6c56fb4bc5f0 157 ( ret = ssl_ticket_gen_key( ctx, 1 ) ) != 0 )
nexpaq 0:6c56fb4bc5f0 158 {
nexpaq 0:6c56fb4bc5f0 159 return( ret );
nexpaq 0:6c56fb4bc5f0 160 }
nexpaq 0:6c56fb4bc5f0 161
nexpaq 0:6c56fb4bc5f0 162 return( 0 );
nexpaq 0:6c56fb4bc5f0 163 }
nexpaq 0:6c56fb4bc5f0 164
nexpaq 0:6c56fb4bc5f0 165 /*
nexpaq 0:6c56fb4bc5f0 166 * Serialize a session in the following format:
nexpaq 0:6c56fb4bc5f0 167 * 0 . n-1 session structure, n = sizeof(mbedtls_ssl_session)
nexpaq 0:6c56fb4bc5f0 168 * n . n+2 peer_cert length = m (0 if no certificate)
nexpaq 0:6c56fb4bc5f0 169 * n+3 . n+2+m peer cert ASN.1
nexpaq 0:6c56fb4bc5f0 170 */
nexpaq 0:6c56fb4bc5f0 171 static int ssl_save_session( const mbedtls_ssl_session *session,
nexpaq 0:6c56fb4bc5f0 172 unsigned char *buf, size_t buf_len,
nexpaq 0:6c56fb4bc5f0 173 size_t *olen )
nexpaq 0:6c56fb4bc5f0 174 {
nexpaq 0:6c56fb4bc5f0 175 unsigned char *p = buf;
nexpaq 0:6c56fb4bc5f0 176 size_t left = buf_len;
nexpaq 0:6c56fb4bc5f0 177 #if defined(MBEDTLS_X509_CRT_PARSE_C)
nexpaq 0:6c56fb4bc5f0 178 size_t cert_len;
nexpaq 0:6c56fb4bc5f0 179 #endif /* MBEDTLS_X509_CRT_PARSE_C */
nexpaq 0:6c56fb4bc5f0 180
nexpaq 0:6c56fb4bc5f0 181 if( left < sizeof( mbedtls_ssl_session ) )
nexpaq 0:6c56fb4bc5f0 182 return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
nexpaq 0:6c56fb4bc5f0 183
nexpaq 0:6c56fb4bc5f0 184 memcpy( p, session, sizeof( mbedtls_ssl_session ) );
nexpaq 0:6c56fb4bc5f0 185 p += sizeof( mbedtls_ssl_session );
nexpaq 0:6c56fb4bc5f0 186 left -= sizeof( mbedtls_ssl_session );
nexpaq 0:6c56fb4bc5f0 187
nexpaq 0:6c56fb4bc5f0 188 #if defined(MBEDTLS_X509_CRT_PARSE_C)
nexpaq 0:6c56fb4bc5f0 189 if( session->peer_cert == NULL )
nexpaq 0:6c56fb4bc5f0 190 cert_len = 0;
nexpaq 0:6c56fb4bc5f0 191 else
nexpaq 0:6c56fb4bc5f0 192 cert_len = session->peer_cert->raw.len;
nexpaq 0:6c56fb4bc5f0 193
nexpaq 0:6c56fb4bc5f0 194 if( left < 3 + cert_len )
nexpaq 0:6c56fb4bc5f0 195 return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
nexpaq 0:6c56fb4bc5f0 196
nexpaq 0:6c56fb4bc5f0 197 *p++ = (unsigned char)( cert_len >> 16 & 0xFF );
nexpaq 0:6c56fb4bc5f0 198 *p++ = (unsigned char)( cert_len >> 8 & 0xFF );
nexpaq 0:6c56fb4bc5f0 199 *p++ = (unsigned char)( cert_len & 0xFF );
nexpaq 0:6c56fb4bc5f0 200
nexpaq 0:6c56fb4bc5f0 201 if( session->peer_cert != NULL )
nexpaq 0:6c56fb4bc5f0 202 memcpy( p, session->peer_cert->raw.p, cert_len );
nexpaq 0:6c56fb4bc5f0 203
nexpaq 0:6c56fb4bc5f0 204 p += cert_len;
nexpaq 0:6c56fb4bc5f0 205 #endif /* MBEDTLS_X509_CRT_PARSE_C */
nexpaq 0:6c56fb4bc5f0 206
nexpaq 0:6c56fb4bc5f0 207 *olen = p - buf;
nexpaq 0:6c56fb4bc5f0 208
nexpaq 0:6c56fb4bc5f0 209 return( 0 );
nexpaq 0:6c56fb4bc5f0 210 }
nexpaq 0:6c56fb4bc5f0 211
nexpaq 0:6c56fb4bc5f0 212 /*
nexpaq 0:6c56fb4bc5f0 213 * Unserialise session, see ssl_save_session()
nexpaq 0:6c56fb4bc5f0 214 */
nexpaq 0:6c56fb4bc5f0 215 static int ssl_load_session( mbedtls_ssl_session *session,
nexpaq 0:6c56fb4bc5f0 216 const unsigned char *buf, size_t len )
nexpaq 0:6c56fb4bc5f0 217 {
nexpaq 0:6c56fb4bc5f0 218 const unsigned char *p = buf;
nexpaq 0:6c56fb4bc5f0 219 const unsigned char * const end = buf + len;
nexpaq 0:6c56fb4bc5f0 220 #if defined(MBEDTLS_X509_CRT_PARSE_C)
nexpaq 0:6c56fb4bc5f0 221 size_t cert_len;
nexpaq 0:6c56fb4bc5f0 222 #endif /* MBEDTLS_X509_CRT_PARSE_C */
nexpaq 0:6c56fb4bc5f0 223
nexpaq 0:6c56fb4bc5f0 224 if( p + sizeof( mbedtls_ssl_session ) > end )
nexpaq 0:6c56fb4bc5f0 225 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
nexpaq 0:6c56fb4bc5f0 226
nexpaq 0:6c56fb4bc5f0 227 memcpy( session, p, sizeof( mbedtls_ssl_session ) );
nexpaq 0:6c56fb4bc5f0 228 p += sizeof( mbedtls_ssl_session );
nexpaq 0:6c56fb4bc5f0 229
nexpaq 0:6c56fb4bc5f0 230 #if defined(MBEDTLS_X509_CRT_PARSE_C)
nexpaq 0:6c56fb4bc5f0 231 if( p + 3 > end )
nexpaq 0:6c56fb4bc5f0 232 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
nexpaq 0:6c56fb4bc5f0 233
nexpaq 0:6c56fb4bc5f0 234 cert_len = ( p[0] << 16 ) | ( p[1] << 8 ) | p[2];
nexpaq 0:6c56fb4bc5f0 235 p += 3;
nexpaq 0:6c56fb4bc5f0 236
nexpaq 0:6c56fb4bc5f0 237 if( cert_len == 0 )
nexpaq 0:6c56fb4bc5f0 238 {
nexpaq 0:6c56fb4bc5f0 239 session->peer_cert = NULL;
nexpaq 0:6c56fb4bc5f0 240 }
nexpaq 0:6c56fb4bc5f0 241 else
nexpaq 0:6c56fb4bc5f0 242 {
nexpaq 0:6c56fb4bc5f0 243 int ret;
nexpaq 0:6c56fb4bc5f0 244
nexpaq 0:6c56fb4bc5f0 245 if( p + cert_len > end )
nexpaq 0:6c56fb4bc5f0 246 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
nexpaq 0:6c56fb4bc5f0 247
nexpaq 0:6c56fb4bc5f0 248 session->peer_cert = mbedtls_calloc( 1, sizeof( mbedtls_x509_crt ) );
nexpaq 0:6c56fb4bc5f0 249
nexpaq 0:6c56fb4bc5f0 250 if( session->peer_cert == NULL )
nexpaq 0:6c56fb4bc5f0 251 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
nexpaq 0:6c56fb4bc5f0 252
nexpaq 0:6c56fb4bc5f0 253 mbedtls_x509_crt_init( session->peer_cert );
nexpaq 0:6c56fb4bc5f0 254
nexpaq 0:6c56fb4bc5f0 255 if( ( ret = mbedtls_x509_crt_parse_der( session->peer_cert,
nexpaq 0:6c56fb4bc5f0 256 p, cert_len ) ) != 0 )
nexpaq 0:6c56fb4bc5f0 257 {
nexpaq 0:6c56fb4bc5f0 258 mbedtls_x509_crt_free( session->peer_cert );
nexpaq 0:6c56fb4bc5f0 259 mbedtls_free( session->peer_cert );
nexpaq 0:6c56fb4bc5f0 260 session->peer_cert = NULL;
nexpaq 0:6c56fb4bc5f0 261 return( ret );
nexpaq 0:6c56fb4bc5f0 262 }
nexpaq 0:6c56fb4bc5f0 263
nexpaq 0:6c56fb4bc5f0 264 p += cert_len;
nexpaq 0:6c56fb4bc5f0 265 }
nexpaq 0:6c56fb4bc5f0 266 #endif /* MBEDTLS_X509_CRT_PARSE_C */
nexpaq 0:6c56fb4bc5f0 267
nexpaq 0:6c56fb4bc5f0 268 if( p != end )
nexpaq 0:6c56fb4bc5f0 269 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
nexpaq 0:6c56fb4bc5f0 270
nexpaq 0:6c56fb4bc5f0 271 return( 0 );
nexpaq 0:6c56fb4bc5f0 272 }
nexpaq 0:6c56fb4bc5f0 273
nexpaq 0:6c56fb4bc5f0 274 /*
nexpaq 0:6c56fb4bc5f0 275 * Create session ticket, with the following structure:
nexpaq 0:6c56fb4bc5f0 276 *
nexpaq 0:6c56fb4bc5f0 277 * struct {
nexpaq 0:6c56fb4bc5f0 278 * opaque key_name[4];
nexpaq 0:6c56fb4bc5f0 279 * opaque iv[12];
nexpaq 0:6c56fb4bc5f0 280 * opaque encrypted_state<0..2^16-1>;
nexpaq 0:6c56fb4bc5f0 281 * opaque tag[16];
nexpaq 0:6c56fb4bc5f0 282 * } ticket;
nexpaq 0:6c56fb4bc5f0 283 *
nexpaq 0:6c56fb4bc5f0 284 * The key_name, iv, and length of encrypted_state are the additional
nexpaq 0:6c56fb4bc5f0 285 * authenticated data.
nexpaq 0:6c56fb4bc5f0 286 */
nexpaq 0:6c56fb4bc5f0 287 int mbedtls_ssl_ticket_write( void *p_ticket,
nexpaq 0:6c56fb4bc5f0 288 const mbedtls_ssl_session *session,
nexpaq 0:6c56fb4bc5f0 289 unsigned char *start,
nexpaq 0:6c56fb4bc5f0 290 const unsigned char *end,
nexpaq 0:6c56fb4bc5f0 291 size_t *tlen,
nexpaq 0:6c56fb4bc5f0 292 uint32_t *ticket_lifetime )
nexpaq 0:6c56fb4bc5f0 293 {
nexpaq 0:6c56fb4bc5f0 294 int ret;
nexpaq 0:6c56fb4bc5f0 295 mbedtls_ssl_ticket_context *ctx = p_ticket;
nexpaq 0:6c56fb4bc5f0 296 mbedtls_ssl_ticket_key *key;
nexpaq 0:6c56fb4bc5f0 297 unsigned char *key_name = start;
nexpaq 0:6c56fb4bc5f0 298 unsigned char *iv = start + 4;
nexpaq 0:6c56fb4bc5f0 299 unsigned char *state_len_bytes = iv + 12;
nexpaq 0:6c56fb4bc5f0 300 unsigned char *state = state_len_bytes + 2;
nexpaq 0:6c56fb4bc5f0 301 unsigned char *tag;
nexpaq 0:6c56fb4bc5f0 302 size_t clear_len, ciph_len;
nexpaq 0:6c56fb4bc5f0 303
nexpaq 0:6c56fb4bc5f0 304 *tlen = 0;
nexpaq 0:6c56fb4bc5f0 305
nexpaq 0:6c56fb4bc5f0 306 if( ctx == NULL || ctx->f_rng == NULL )
nexpaq 0:6c56fb4bc5f0 307 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
nexpaq 0:6c56fb4bc5f0 308
nexpaq 0:6c56fb4bc5f0 309 /* We need at least 4 bytes for key_name, 12 for IV, 2 for len 16 for tag,
nexpaq 0:6c56fb4bc5f0 310 * in addition to session itself, that will be checked when writing it. */
nexpaq 0:6c56fb4bc5f0 311 if( end - start < 4 + 12 + 2 + 16 )
nexpaq 0:6c56fb4bc5f0 312 return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
nexpaq 0:6c56fb4bc5f0 313
nexpaq 0:6c56fb4bc5f0 314 #if defined(MBEDTLS_THREADING_C)
nexpaq 0:6c56fb4bc5f0 315 if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
nexpaq 0:6c56fb4bc5f0 316 return( ret );
nexpaq 0:6c56fb4bc5f0 317 #endif
nexpaq 0:6c56fb4bc5f0 318
nexpaq 0:6c56fb4bc5f0 319 if( ( ret = ssl_ticket_update_keys( ctx ) ) != 0 )
nexpaq 0:6c56fb4bc5f0 320 goto cleanup;
nexpaq 0:6c56fb4bc5f0 321
nexpaq 0:6c56fb4bc5f0 322 key = &ctx->keys[ctx->active];
nexpaq 0:6c56fb4bc5f0 323
nexpaq 0:6c56fb4bc5f0 324 *ticket_lifetime = ctx->ticket_lifetime;
nexpaq 0:6c56fb4bc5f0 325
nexpaq 0:6c56fb4bc5f0 326 memcpy( key_name, key->name, 4 );
nexpaq 0:6c56fb4bc5f0 327
nexpaq 0:6c56fb4bc5f0 328 if( ( ret = ctx->f_rng( ctx->p_rng, iv, 12 ) ) != 0 )
nexpaq 0:6c56fb4bc5f0 329 goto cleanup;
nexpaq 0:6c56fb4bc5f0 330
nexpaq 0:6c56fb4bc5f0 331 /* Dump session state */
nexpaq 0:6c56fb4bc5f0 332 if( ( ret = ssl_save_session( session,
nexpaq 0:6c56fb4bc5f0 333 state, end - state, &clear_len ) ) != 0 ||
nexpaq 0:6c56fb4bc5f0 334 (unsigned long) clear_len > 65535 )
nexpaq 0:6c56fb4bc5f0 335 {
nexpaq 0:6c56fb4bc5f0 336 goto cleanup;
nexpaq 0:6c56fb4bc5f0 337 }
nexpaq 0:6c56fb4bc5f0 338 state_len_bytes[0] = ( clear_len >> 8 ) & 0xff;
nexpaq 0:6c56fb4bc5f0 339 state_len_bytes[1] = ( clear_len ) & 0xff;
nexpaq 0:6c56fb4bc5f0 340
nexpaq 0:6c56fb4bc5f0 341 /* Encrypt and authenticate */
nexpaq 0:6c56fb4bc5f0 342 tag = state + clear_len;
nexpaq 0:6c56fb4bc5f0 343 if( ( ret = mbedtls_cipher_auth_encrypt( &key->ctx,
nexpaq 0:6c56fb4bc5f0 344 iv, 12, key_name, 4 + 12 + 2,
nexpaq 0:6c56fb4bc5f0 345 state, clear_len, state, &ciph_len, tag, 16 ) ) != 0 )
nexpaq 0:6c56fb4bc5f0 346 {
nexpaq 0:6c56fb4bc5f0 347 goto cleanup;
nexpaq 0:6c56fb4bc5f0 348 }
nexpaq 0:6c56fb4bc5f0 349 if( ciph_len != clear_len )
nexpaq 0:6c56fb4bc5f0 350 {
nexpaq 0:6c56fb4bc5f0 351 ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR;
nexpaq 0:6c56fb4bc5f0 352 goto cleanup;
nexpaq 0:6c56fb4bc5f0 353 }
nexpaq 0:6c56fb4bc5f0 354
nexpaq 0:6c56fb4bc5f0 355 *tlen = 4 + 12 + 2 + 16 + ciph_len;
nexpaq 0:6c56fb4bc5f0 356
nexpaq 0:6c56fb4bc5f0 357 cleanup:
nexpaq 0:6c56fb4bc5f0 358 #if defined(MBEDTLS_THREADING_C)
nexpaq 0:6c56fb4bc5f0 359 if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
nexpaq 0:6c56fb4bc5f0 360 return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
nexpaq 0:6c56fb4bc5f0 361 #endif
nexpaq 0:6c56fb4bc5f0 362
nexpaq 0:6c56fb4bc5f0 363 return( ret );
nexpaq 0:6c56fb4bc5f0 364 }
nexpaq 0:6c56fb4bc5f0 365
nexpaq 0:6c56fb4bc5f0 366 /*
nexpaq 0:6c56fb4bc5f0 367 * Select key based on name
nexpaq 0:6c56fb4bc5f0 368 */
nexpaq 0:6c56fb4bc5f0 369 static mbedtls_ssl_ticket_key *ssl_ticket_select_key(
nexpaq 0:6c56fb4bc5f0 370 mbedtls_ssl_ticket_context *ctx,
nexpaq 0:6c56fb4bc5f0 371 const unsigned char name[4] )
nexpaq 0:6c56fb4bc5f0 372 {
nexpaq 0:6c56fb4bc5f0 373 unsigned char i;
nexpaq 0:6c56fb4bc5f0 374
nexpaq 0:6c56fb4bc5f0 375 for( i = 0; i < sizeof( ctx->keys ) / sizeof( *ctx->keys ); i++ )
nexpaq 0:6c56fb4bc5f0 376 if( memcmp( name, ctx->keys[i].name, 4 ) == 0 )
nexpaq 0:6c56fb4bc5f0 377 return( &ctx->keys[i] );
nexpaq 0:6c56fb4bc5f0 378
nexpaq 0:6c56fb4bc5f0 379 return( NULL );
nexpaq 0:6c56fb4bc5f0 380 }
nexpaq 0:6c56fb4bc5f0 381
nexpaq 0:6c56fb4bc5f0 382 /*
nexpaq 0:6c56fb4bc5f0 383 * Load session ticket (see mbedtls_ssl_ticket_write for structure)
nexpaq 0:6c56fb4bc5f0 384 */
nexpaq 0:6c56fb4bc5f0 385 int mbedtls_ssl_ticket_parse( void *p_ticket,
nexpaq 0:6c56fb4bc5f0 386 mbedtls_ssl_session *session,
nexpaq 0:6c56fb4bc5f0 387 unsigned char *buf,
nexpaq 0:6c56fb4bc5f0 388 size_t len )
nexpaq 0:6c56fb4bc5f0 389 {
nexpaq 0:6c56fb4bc5f0 390 int ret;
nexpaq 0:6c56fb4bc5f0 391 mbedtls_ssl_ticket_context *ctx = p_ticket;
nexpaq 0:6c56fb4bc5f0 392 mbedtls_ssl_ticket_key *key;
nexpaq 0:6c56fb4bc5f0 393 unsigned char *key_name = buf;
nexpaq 0:6c56fb4bc5f0 394 unsigned char *iv = buf + 4;
nexpaq 0:6c56fb4bc5f0 395 unsigned char *enc_len_p = iv + 12;
nexpaq 0:6c56fb4bc5f0 396 unsigned char *ticket = enc_len_p + 2;
nexpaq 0:6c56fb4bc5f0 397 unsigned char *tag;
nexpaq 0:6c56fb4bc5f0 398 size_t enc_len, clear_len;
nexpaq 0:6c56fb4bc5f0 399
nexpaq 0:6c56fb4bc5f0 400 if( ctx == NULL || ctx->f_rng == NULL )
nexpaq 0:6c56fb4bc5f0 401 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
nexpaq 0:6c56fb4bc5f0 402
nexpaq 0:6c56fb4bc5f0 403 /* See mbedtls_ssl_ticket_write() */
nexpaq 0:6c56fb4bc5f0 404 if( len < 4 + 12 + 2 + 16 )
nexpaq 0:6c56fb4bc5f0 405 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
nexpaq 0:6c56fb4bc5f0 406
nexpaq 0:6c56fb4bc5f0 407 #if defined(MBEDTLS_THREADING_C)
nexpaq 0:6c56fb4bc5f0 408 if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
nexpaq 0:6c56fb4bc5f0 409 return( ret );
nexpaq 0:6c56fb4bc5f0 410 #endif
nexpaq 0:6c56fb4bc5f0 411
nexpaq 0:6c56fb4bc5f0 412 if( ( ret = ssl_ticket_update_keys( ctx ) ) != 0 )
nexpaq 0:6c56fb4bc5f0 413 goto cleanup;
nexpaq 0:6c56fb4bc5f0 414
nexpaq 0:6c56fb4bc5f0 415 enc_len = ( enc_len_p[0] << 8 ) | enc_len_p[1];
nexpaq 0:6c56fb4bc5f0 416 tag = ticket + enc_len;
nexpaq 0:6c56fb4bc5f0 417
nexpaq 0:6c56fb4bc5f0 418 if( len != 4 + 12 + 2 + enc_len + 16 )
nexpaq 0:6c56fb4bc5f0 419 {
nexpaq 0:6c56fb4bc5f0 420 ret = MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
nexpaq 0:6c56fb4bc5f0 421 goto cleanup;
nexpaq 0:6c56fb4bc5f0 422 }
nexpaq 0:6c56fb4bc5f0 423
nexpaq 0:6c56fb4bc5f0 424 /* Select key */
nexpaq 0:6c56fb4bc5f0 425 if( ( key = ssl_ticket_select_key( ctx, key_name ) ) == NULL )
nexpaq 0:6c56fb4bc5f0 426 {
nexpaq 0:6c56fb4bc5f0 427 /* We can't know for sure but this is a likely option unless we're
nexpaq 0:6c56fb4bc5f0 428 * under attack - this is only informative anyway */
nexpaq 0:6c56fb4bc5f0 429 ret = MBEDTLS_ERR_SSL_SESSION_TICKET_EXPIRED;
nexpaq 0:6c56fb4bc5f0 430 goto cleanup;
nexpaq 0:6c56fb4bc5f0 431 }
nexpaq 0:6c56fb4bc5f0 432
nexpaq 0:6c56fb4bc5f0 433 /* Decrypt and authenticate */
nexpaq 0:6c56fb4bc5f0 434 if( ( ret = mbedtls_cipher_auth_decrypt( &key->ctx, iv, 12,
nexpaq 0:6c56fb4bc5f0 435 key_name, 4 + 12 + 2, ticket, enc_len,
nexpaq 0:6c56fb4bc5f0 436 ticket, &clear_len, tag, 16 ) ) != 0 )
nexpaq 0:6c56fb4bc5f0 437 {
nexpaq 0:6c56fb4bc5f0 438 if( ret == MBEDTLS_ERR_CIPHER_AUTH_FAILED )
nexpaq 0:6c56fb4bc5f0 439 ret = MBEDTLS_ERR_SSL_INVALID_MAC;
nexpaq 0:6c56fb4bc5f0 440
nexpaq 0:6c56fb4bc5f0 441 goto cleanup;
nexpaq 0:6c56fb4bc5f0 442 }
nexpaq 0:6c56fb4bc5f0 443 if( clear_len != enc_len )
nexpaq 0:6c56fb4bc5f0 444 {
nexpaq 0:6c56fb4bc5f0 445 ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR;
nexpaq 0:6c56fb4bc5f0 446 goto cleanup;
nexpaq 0:6c56fb4bc5f0 447 }
nexpaq 0:6c56fb4bc5f0 448
nexpaq 0:6c56fb4bc5f0 449 /* Actually load session */
nexpaq 0:6c56fb4bc5f0 450 if( ( ret = ssl_load_session( session, ticket, clear_len ) ) != 0 )
nexpaq 0:6c56fb4bc5f0 451 goto cleanup;
nexpaq 0:6c56fb4bc5f0 452
nexpaq 0:6c56fb4bc5f0 453 #if defined(MBEDTLS_HAVE_TIME)
nexpaq 0:6c56fb4bc5f0 454 {
nexpaq 0:6c56fb4bc5f0 455 /* Check for expiration */
nexpaq 0:6c56fb4bc5f0 456 mbedtls_time_t current_time = mbedtls_time( NULL );
nexpaq 0:6c56fb4bc5f0 457
nexpaq 0:6c56fb4bc5f0 458 if( current_time < session->start ||
nexpaq 0:6c56fb4bc5f0 459 (uint32_t)( current_time - session->start ) > ctx->ticket_lifetime )
nexpaq 0:6c56fb4bc5f0 460 {
nexpaq 0:6c56fb4bc5f0 461 ret = MBEDTLS_ERR_SSL_SESSION_TICKET_EXPIRED;
nexpaq 0:6c56fb4bc5f0 462 goto cleanup;
nexpaq 0:6c56fb4bc5f0 463 }
nexpaq 0:6c56fb4bc5f0 464 }
nexpaq 0:6c56fb4bc5f0 465 #endif
nexpaq 0:6c56fb4bc5f0 466
nexpaq 0:6c56fb4bc5f0 467 cleanup:
nexpaq 0:6c56fb4bc5f0 468 #if defined(MBEDTLS_THREADING_C)
nexpaq 0:6c56fb4bc5f0 469 if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
nexpaq 0:6c56fb4bc5f0 470 return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
nexpaq 0:6c56fb4bc5f0 471 #endif
nexpaq 0:6c56fb4bc5f0 472
nexpaq 0:6c56fb4bc5f0 473 return( ret );
nexpaq 0:6c56fb4bc5f0 474 }
nexpaq 0:6c56fb4bc5f0 475
nexpaq 0:6c56fb4bc5f0 476 /*
nexpaq 0:6c56fb4bc5f0 477 * Free context
nexpaq 0:6c56fb4bc5f0 478 */
nexpaq 0:6c56fb4bc5f0 479 void mbedtls_ssl_ticket_free( mbedtls_ssl_ticket_context *ctx )
nexpaq 0:6c56fb4bc5f0 480 {
nexpaq 0:6c56fb4bc5f0 481 mbedtls_cipher_free( &ctx->keys[0].ctx );
nexpaq 0:6c56fb4bc5f0 482 mbedtls_cipher_free( &ctx->keys[1].ctx );
nexpaq 0:6c56fb4bc5f0 483
nexpaq 0:6c56fb4bc5f0 484 #if defined(MBEDTLS_THREADING_C)
nexpaq 0:6c56fb4bc5f0 485 mbedtls_mutex_free( &ctx->mutex );
nexpaq 0:6c56fb4bc5f0 486 #endif
nexpaq 0:6c56fb4bc5f0 487
nexpaq 0:6c56fb4bc5f0 488 mbedtls_zeroize( ctx, sizeof( mbedtls_ssl_ticket_context ) );
nexpaq 0:6c56fb4bc5f0 489 }
nexpaq 0:6c56fb4bc5f0 490
nexpaq 0:6c56fb4bc5f0 491 #endif /* MBEDTLS_SSL_TICKET_C */