Magnificent7 / Hackathon

Includes library modifications to allow access to AIN_4 (AIN_0 / 5)

mbd_os/features/mbedtls/src/ssl_ticket.c@0:eafc3fd41f75, 2016-09-20 (annotated)

Committer:
bryantaylor
Date:
Tue Sep 20 21:26:12 2016 +0000
Revision:
0:eafc3fd41f75
hackathon

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bryantaylor 0:eafc3fd41f75 1 /*
bryantaylor 0:eafc3fd41f75 2 * TLS server tickets callbacks implementation
bryantaylor 0:eafc3fd41f75 3 *
bryantaylor 0:eafc3fd41f75 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
bryantaylor 0:eafc3fd41f75 5 * SPDX-License-Identifier: Apache-2.0
bryantaylor 0:eafc3fd41f75 6 *
bryantaylor 0:eafc3fd41f75 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
bryantaylor 0:eafc3fd41f75 8 * not use this file except in compliance with the License.
bryantaylor 0:eafc3fd41f75 9 * You may obtain a copy of the License at
bryantaylor 0:eafc3fd41f75 10 *
bryantaylor 0:eafc3fd41f75 11 * http://www.apache.org/licenses/LICENSE-2.0
bryantaylor 0:eafc3fd41f75 12 *
bryantaylor 0:eafc3fd41f75 13 * Unless required by applicable law or agreed to in writing, software
bryantaylor 0:eafc3fd41f75 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
bryantaylor 0:eafc3fd41f75 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
bryantaylor 0:eafc3fd41f75 16 * See the License for the specific language governing permissions and
bryantaylor 0:eafc3fd41f75 17 * limitations under the License.
bryantaylor 0:eafc3fd41f75 18 *
bryantaylor 0:eafc3fd41f75 19 * This file is part of mbed TLS (https://tls.mbed.org)
bryantaylor 0:eafc3fd41f75 20 */
bryantaylor 0:eafc3fd41f75 21
bryantaylor 0:eafc3fd41f75 22 #if !defined(MBEDTLS_CONFIG_FILE)
bryantaylor 0:eafc3fd41f75 23 #include "mbedtls/config.h"
bryantaylor 0:eafc3fd41f75 24 #else
bryantaylor 0:eafc3fd41f75 25 #include MBEDTLS_CONFIG_FILE
bryantaylor 0:eafc3fd41f75 26 #endif
bryantaylor 0:eafc3fd41f75 27
bryantaylor 0:eafc3fd41f75 28 #if defined(MBEDTLS_SSL_TICKET_C)
bryantaylor 0:eafc3fd41f75 29
bryantaylor 0:eafc3fd41f75 30 #if defined(MBEDTLS_PLATFORM_C)
bryantaylor 0:eafc3fd41f75 31 #include "mbedtls/platform.h"
bryantaylor 0:eafc3fd41f75 32 #else
bryantaylor 0:eafc3fd41f75 33 #include <stdlib.h>
bryantaylor 0:eafc3fd41f75 34 #define mbedtls_calloc calloc
bryantaylor 0:eafc3fd41f75 35 #define mbedtls_free free
bryantaylor 0:eafc3fd41f75 36 #define mbedtls_time time
bryantaylor 0:eafc3fd41f75 37 #define mbedtls_time_t time_t
bryantaylor 0:eafc3fd41f75 38 #endif
bryantaylor 0:eafc3fd41f75 39
bryantaylor 0:eafc3fd41f75 40 #include "mbedtls/ssl_ticket.h"
bryantaylor 0:eafc3fd41f75 41
bryantaylor 0:eafc3fd41f75 42 #include <string.h>
bryantaylor 0:eafc3fd41f75 43
bryantaylor 0:eafc3fd41f75 44 /* Implementation that should never be optimized out by the compiler */
bryantaylor 0:eafc3fd41f75 45 static void mbedtls_zeroize( void *v, size_t n ) {
bryantaylor 0:eafc3fd41f75 46 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
bryantaylor 0:eafc3fd41f75 47 }
bryantaylor 0:eafc3fd41f75 48
bryantaylor 0:eafc3fd41f75 49 /*
bryantaylor 0:eafc3fd41f75 50 * Initialze context
bryantaylor 0:eafc3fd41f75 51 */
bryantaylor 0:eafc3fd41f75 52 void mbedtls_ssl_ticket_init( mbedtls_ssl_ticket_context *ctx )
bryantaylor 0:eafc3fd41f75 53 {
bryantaylor 0:eafc3fd41f75 54 memset( ctx, 0, sizeof( mbedtls_ssl_ticket_context ) );
bryantaylor 0:eafc3fd41f75 55
bryantaylor 0:eafc3fd41f75 56 #if defined(MBEDTLS_THREADING_C)
bryantaylor 0:eafc3fd41f75 57 mbedtls_mutex_init( &ctx->mutex );
bryantaylor 0:eafc3fd41f75 58 #endif
bryantaylor 0:eafc3fd41f75 59 }
bryantaylor 0:eafc3fd41f75 60
bryantaylor 0:eafc3fd41f75 61 #define MAX_KEY_BYTES 32 /* 256 bits */
bryantaylor 0:eafc3fd41f75 62
bryantaylor 0:eafc3fd41f75 63 /*
bryantaylor 0:eafc3fd41f75 64 * Generate/update a key
bryantaylor 0:eafc3fd41f75 65 */
bryantaylor 0:eafc3fd41f75 66 static int ssl_ticket_gen_key( mbedtls_ssl_ticket_context *ctx,
bryantaylor 0:eafc3fd41f75 67 unsigned char index )
bryantaylor 0:eafc3fd41f75 68 {
bryantaylor 0:eafc3fd41f75 69 int ret;
bryantaylor 0:eafc3fd41f75 70 unsigned char buf[MAX_KEY_BYTES];
bryantaylor 0:eafc3fd41f75 71 mbedtls_ssl_ticket_key *key = ctx->keys + index;
bryantaylor 0:eafc3fd41f75 72
bryantaylor 0:eafc3fd41f75 73 #if defined(MBEDTLS_HAVE_TIME)
bryantaylor 0:eafc3fd41f75 74 key->generation_time = (uint32_t) mbedtls_time( NULL );
bryantaylor 0:eafc3fd41f75 75 #endif
bryantaylor 0:eafc3fd41f75 76
bryantaylor 0:eafc3fd41f75 77 if( ( ret = ctx->f_rng( ctx->p_rng, key->name, sizeof( key->name ) ) ) != 0 )
bryantaylor 0:eafc3fd41f75 78 return( ret );
bryantaylor 0:eafc3fd41f75 79
bryantaylor 0:eafc3fd41f75 80 if( ( ret = ctx->f_rng( ctx->p_rng, buf, sizeof( buf ) ) ) != 0 )
bryantaylor 0:eafc3fd41f75 81 return( ret );
bryantaylor 0:eafc3fd41f75 82
bryantaylor 0:eafc3fd41f75 83 /* With GCM and CCM, same context can encrypt & decrypt */
bryantaylor 0:eafc3fd41f75 84 ret = mbedtls_cipher_setkey( &key->ctx, buf,
bryantaylor 0:eafc3fd41f75 85 mbedtls_cipher_get_key_bitlen( &key->ctx ),
bryantaylor 0:eafc3fd41f75 86 MBEDTLS_ENCRYPT );
bryantaylor 0:eafc3fd41f75 87
bryantaylor 0:eafc3fd41f75 88 mbedtls_zeroize( buf, sizeof( buf ) );
bryantaylor 0:eafc3fd41f75 89
bryantaylor 0:eafc3fd41f75 90 return( ret );
bryantaylor 0:eafc3fd41f75 91 }
bryantaylor 0:eafc3fd41f75 92
bryantaylor 0:eafc3fd41f75 93 /*
bryantaylor 0:eafc3fd41f75 94 * Rotate/generate keys if necessary
bryantaylor 0:eafc3fd41f75 95 */
bryantaylor 0:eafc3fd41f75 96 static int ssl_ticket_update_keys( mbedtls_ssl_ticket_context *ctx )
bryantaylor 0:eafc3fd41f75 97 {
bryantaylor 0:eafc3fd41f75 98 #if !defined(MBEDTLS_HAVE_TIME)
bryantaylor 0:eafc3fd41f75 99 ((void) ctx);
bryantaylor 0:eafc3fd41f75 100 #else
bryantaylor 0:eafc3fd41f75 101 if( ctx->ticket_lifetime != 0 )
bryantaylor 0:eafc3fd41f75 102 {
bryantaylor 0:eafc3fd41f75 103 uint32_t current_time = (uint32_t) mbedtls_time( NULL );
bryantaylor 0:eafc3fd41f75 104 uint32_t key_time = ctx->keys[ctx->active].generation_time;
bryantaylor 0:eafc3fd41f75 105
bryantaylor 0:eafc3fd41f75 106 if( current_time > key_time &&
bryantaylor 0:eafc3fd41f75 107 current_time - key_time < ctx->ticket_lifetime )
bryantaylor 0:eafc3fd41f75 108 {
bryantaylor 0:eafc3fd41f75 109 return( 0 );
bryantaylor 0:eafc3fd41f75 110 }
bryantaylor 0:eafc3fd41f75 111
bryantaylor 0:eafc3fd41f75 112 ctx->active = 1 - ctx->active;
bryantaylor 0:eafc3fd41f75 113
bryantaylor 0:eafc3fd41f75 114 return( ssl_ticket_gen_key( ctx, ctx->active ) );
bryantaylor 0:eafc3fd41f75 115 }
bryantaylor 0:eafc3fd41f75 116 else
bryantaylor 0:eafc3fd41f75 117 #endif /* MBEDTLS_HAVE_TIME */
bryantaylor 0:eafc3fd41f75 118 return( 0 );
bryantaylor 0:eafc3fd41f75 119 }
bryantaylor 0:eafc3fd41f75 120
bryantaylor 0:eafc3fd41f75 121 /*
bryantaylor 0:eafc3fd41f75 122 * Setup context for actual use
bryantaylor 0:eafc3fd41f75 123 */
bryantaylor 0:eafc3fd41f75 124 int mbedtls_ssl_ticket_setup( mbedtls_ssl_ticket_context *ctx,
bryantaylor 0:eafc3fd41f75 125 int (*f_rng)(void *, unsigned char *, size_t), void *p_rng,
bryantaylor 0:eafc3fd41f75 126 mbedtls_cipher_type_t cipher,
bryantaylor 0:eafc3fd41f75 127 uint32_t lifetime )
bryantaylor 0:eafc3fd41f75 128 {
bryantaylor 0:eafc3fd41f75 129 int ret;
bryantaylor 0:eafc3fd41f75 130 const mbedtls_cipher_info_t *cipher_info;
bryantaylor 0:eafc3fd41f75 131
bryantaylor 0:eafc3fd41f75 132 ctx->f_rng = f_rng;
bryantaylor 0:eafc3fd41f75 133 ctx->p_rng = p_rng;
bryantaylor 0:eafc3fd41f75 134
bryantaylor 0:eafc3fd41f75 135 ctx->ticket_lifetime = lifetime;
bryantaylor 0:eafc3fd41f75 136
bryantaylor 0:eafc3fd41f75 137 cipher_info = mbedtls_cipher_info_from_type( cipher);
bryantaylor 0:eafc3fd41f75 138 if( cipher_info == NULL )
bryantaylor 0:eafc3fd41f75 139 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
bryantaylor 0:eafc3fd41f75 140
bryantaylor 0:eafc3fd41f75 141 if( cipher_info->mode != MBEDTLS_MODE_GCM &&
bryantaylor 0:eafc3fd41f75 142 cipher_info->mode != MBEDTLS_MODE_CCM )
bryantaylor 0:eafc3fd41f75 143 {
bryantaylor 0:eafc3fd41f75 144 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
bryantaylor 0:eafc3fd41f75 145 }
bryantaylor 0:eafc3fd41f75 146
bryantaylor 0:eafc3fd41f75 147 if( cipher_info->key_bitlen > 8 * MAX_KEY_BYTES )
bryantaylor 0:eafc3fd41f75 148 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
bryantaylor 0:eafc3fd41f75 149
bryantaylor 0:eafc3fd41f75 150 if( ( ret = mbedtls_cipher_setup( &ctx->keys[0].ctx, cipher_info ) ) != 0 ||
bryantaylor 0:eafc3fd41f75 151 ( ret = mbedtls_cipher_setup( &ctx->keys[1].ctx, cipher_info ) ) != 0 )
bryantaylor 0:eafc3fd41f75 152 {
bryantaylor 0:eafc3fd41f75 153 return( ret );
bryantaylor 0:eafc3fd41f75 154 }
bryantaylor 0:eafc3fd41f75 155
bryantaylor 0:eafc3fd41f75 156 if( ( ret = ssl_ticket_gen_key( ctx, 0 ) ) != 0 ||
bryantaylor 0:eafc3fd41f75 157 ( ret = ssl_ticket_gen_key( ctx, 1 ) ) != 0 )
bryantaylor 0:eafc3fd41f75 158 {
bryantaylor 0:eafc3fd41f75 159 return( ret );
bryantaylor 0:eafc3fd41f75 160 }
bryantaylor 0:eafc3fd41f75 161
bryantaylor 0:eafc3fd41f75 162 return( 0 );
bryantaylor 0:eafc3fd41f75 163 }
bryantaylor 0:eafc3fd41f75 164
bryantaylor 0:eafc3fd41f75 165 /*
bryantaylor 0:eafc3fd41f75 166 * Serialize a session in the following format:
bryantaylor 0:eafc3fd41f75 167 * 0 . n-1 session structure, n = sizeof(mbedtls_ssl_session)
bryantaylor 0:eafc3fd41f75 168 * n . n+2 peer_cert length = m (0 if no certificate)
bryantaylor 0:eafc3fd41f75 169 * n+3 . n+2+m peer cert ASN.1
bryantaylor 0:eafc3fd41f75 170 */
bryantaylor 0:eafc3fd41f75 171 static int ssl_save_session( const mbedtls_ssl_session *session,
bryantaylor 0:eafc3fd41f75 172 unsigned char *buf, size_t buf_len,
bryantaylor 0:eafc3fd41f75 173 size_t *olen )
bryantaylor 0:eafc3fd41f75 174 {
bryantaylor 0:eafc3fd41f75 175 unsigned char *p = buf;
bryantaylor 0:eafc3fd41f75 176 size_t left = buf_len;
bryantaylor 0:eafc3fd41f75 177 #if defined(MBEDTLS_X509_CRT_PARSE_C)
bryantaylor 0:eafc3fd41f75 178 size_t cert_len;
bryantaylor 0:eafc3fd41f75 179 #endif /* MBEDTLS_X509_CRT_PARSE_C */
bryantaylor 0:eafc3fd41f75 180
bryantaylor 0:eafc3fd41f75 181 if( left < sizeof( mbedtls_ssl_session ) )
bryantaylor 0:eafc3fd41f75 182 return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
bryantaylor 0:eafc3fd41f75 183
bryantaylor 0:eafc3fd41f75 184 memcpy( p, session, sizeof( mbedtls_ssl_session ) );
bryantaylor 0:eafc3fd41f75 185 p += sizeof( mbedtls_ssl_session );
bryantaylor 0:eafc3fd41f75 186 left -= sizeof( mbedtls_ssl_session );
bryantaylor 0:eafc3fd41f75 187
bryantaylor 0:eafc3fd41f75 188 #if defined(MBEDTLS_X509_CRT_PARSE_C)
bryantaylor 0:eafc3fd41f75 189 if( session->peer_cert == NULL )
bryantaylor 0:eafc3fd41f75 190 cert_len = 0;
bryantaylor 0:eafc3fd41f75 191 else
bryantaylor 0:eafc3fd41f75 192 cert_len = session->peer_cert->raw.len;
bryantaylor 0:eafc3fd41f75 193
bryantaylor 0:eafc3fd41f75 194 if( left < 3 + cert_len )
bryantaylor 0:eafc3fd41f75 195 return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
bryantaylor 0:eafc3fd41f75 196
bryantaylor 0:eafc3fd41f75 197 *p++ = (unsigned char)( cert_len >> 16 & 0xFF );
bryantaylor 0:eafc3fd41f75 198 *p++ = (unsigned char)( cert_len >> 8 & 0xFF );
bryantaylor 0:eafc3fd41f75 199 *p++ = (unsigned char)( cert_len & 0xFF );
bryantaylor 0:eafc3fd41f75 200
bryantaylor 0:eafc3fd41f75 201 if( session->peer_cert != NULL )
bryantaylor 0:eafc3fd41f75 202 memcpy( p, session->peer_cert->raw.p, cert_len );
bryantaylor 0:eafc3fd41f75 203
bryantaylor 0:eafc3fd41f75 204 p += cert_len;
bryantaylor 0:eafc3fd41f75 205 #endif /* MBEDTLS_X509_CRT_PARSE_C */
bryantaylor 0:eafc3fd41f75 206
bryantaylor 0:eafc3fd41f75 207 *olen = p - buf;
bryantaylor 0:eafc3fd41f75 208
bryantaylor 0:eafc3fd41f75 209 return( 0 );
bryantaylor 0:eafc3fd41f75 210 }
bryantaylor 0:eafc3fd41f75 211
bryantaylor 0:eafc3fd41f75 212 /*
bryantaylor 0:eafc3fd41f75 213 * Unserialise session, see ssl_save_session()
bryantaylor 0:eafc3fd41f75 214 */
bryantaylor 0:eafc3fd41f75 215 static int ssl_load_session( mbedtls_ssl_session *session,
bryantaylor 0:eafc3fd41f75 216 const unsigned char *buf, size_t len )
bryantaylor 0:eafc3fd41f75 217 {
bryantaylor 0:eafc3fd41f75 218 const unsigned char *p = buf;
bryantaylor 0:eafc3fd41f75 219 const unsigned char * const end = buf + len;
bryantaylor 0:eafc3fd41f75 220 #if defined(MBEDTLS_X509_CRT_PARSE_C)
bryantaylor 0:eafc3fd41f75 221 size_t cert_len;
bryantaylor 0:eafc3fd41f75 222 #endif /* MBEDTLS_X509_CRT_PARSE_C */
bryantaylor 0:eafc3fd41f75 223
bryantaylor 0:eafc3fd41f75 224 if( p + sizeof( mbedtls_ssl_session ) > end )
bryantaylor 0:eafc3fd41f75 225 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
bryantaylor 0:eafc3fd41f75 226
bryantaylor 0:eafc3fd41f75 227 memcpy( session, p, sizeof( mbedtls_ssl_session ) );
bryantaylor 0:eafc3fd41f75 228 p += sizeof( mbedtls_ssl_session );
bryantaylor 0:eafc3fd41f75 229
bryantaylor 0:eafc3fd41f75 230 #if defined(MBEDTLS_X509_CRT_PARSE_C)
bryantaylor 0:eafc3fd41f75 231 if( p + 3 > end )
bryantaylor 0:eafc3fd41f75 232 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
bryantaylor 0:eafc3fd41f75 233
bryantaylor 0:eafc3fd41f75 234 cert_len = ( p[0] << 16 ) | ( p[1] << 8 ) | p[2];
bryantaylor 0:eafc3fd41f75 235 p += 3;
bryantaylor 0:eafc3fd41f75 236
bryantaylor 0:eafc3fd41f75 237 if( cert_len == 0 )
bryantaylor 0:eafc3fd41f75 238 {
bryantaylor 0:eafc3fd41f75 239 session->peer_cert = NULL;
bryantaylor 0:eafc3fd41f75 240 }
bryantaylor 0:eafc3fd41f75 241 else
bryantaylor 0:eafc3fd41f75 242 {
bryantaylor 0:eafc3fd41f75 243 int ret;
bryantaylor 0:eafc3fd41f75 244
bryantaylor 0:eafc3fd41f75 245 if( p + cert_len > end )
bryantaylor 0:eafc3fd41f75 246 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
bryantaylor 0:eafc3fd41f75 247
bryantaylor 0:eafc3fd41f75 248 session->peer_cert = mbedtls_calloc( 1, sizeof( mbedtls_x509_crt ) );
bryantaylor 0:eafc3fd41f75 249
bryantaylor 0:eafc3fd41f75 250 if( session->peer_cert == NULL )
bryantaylor 0:eafc3fd41f75 251 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
bryantaylor 0:eafc3fd41f75 252
bryantaylor 0:eafc3fd41f75 253 mbedtls_x509_crt_init( session->peer_cert );
bryantaylor 0:eafc3fd41f75 254
bryantaylor 0:eafc3fd41f75 255 if( ( ret = mbedtls_x509_crt_parse_der( session->peer_cert,
bryantaylor 0:eafc3fd41f75 256 p, cert_len ) ) != 0 )
bryantaylor 0:eafc3fd41f75 257 {
bryantaylor 0:eafc3fd41f75 258 mbedtls_x509_crt_free( session->peer_cert );
bryantaylor 0:eafc3fd41f75 259 mbedtls_free( session->peer_cert );
bryantaylor 0:eafc3fd41f75 260 session->peer_cert = NULL;
bryantaylor 0:eafc3fd41f75 261 return( ret );
bryantaylor 0:eafc3fd41f75 262 }
bryantaylor 0:eafc3fd41f75 263
bryantaylor 0:eafc3fd41f75 264 p += cert_len;
bryantaylor 0:eafc3fd41f75 265 }
bryantaylor 0:eafc3fd41f75 266 #endif /* MBEDTLS_X509_CRT_PARSE_C */
bryantaylor 0:eafc3fd41f75 267
bryantaylor 0:eafc3fd41f75 268 if( p != end )
bryantaylor 0:eafc3fd41f75 269 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
bryantaylor 0:eafc3fd41f75 270
bryantaylor 0:eafc3fd41f75 271 return( 0 );
bryantaylor 0:eafc3fd41f75 272 }
bryantaylor 0:eafc3fd41f75 273
bryantaylor 0:eafc3fd41f75 274 /*
bryantaylor 0:eafc3fd41f75 275 * Create session ticket, with the following structure:
bryantaylor 0:eafc3fd41f75 276 *
bryantaylor 0:eafc3fd41f75 277 * struct {
bryantaylor 0:eafc3fd41f75 278 * opaque key_name[4];
bryantaylor 0:eafc3fd41f75 279 * opaque iv[12];
bryantaylor 0:eafc3fd41f75 280 * opaque encrypted_state<0..2^16-1>;
bryantaylor 0:eafc3fd41f75 281 * opaque tag[16];
bryantaylor 0:eafc3fd41f75 282 * } ticket;
bryantaylor 0:eafc3fd41f75 283 *
bryantaylor 0:eafc3fd41f75 284 * The key_name, iv, and length of encrypted_state are the additional
bryantaylor 0:eafc3fd41f75 285 * authenticated data.
bryantaylor 0:eafc3fd41f75 286 */
bryantaylor 0:eafc3fd41f75 287 int mbedtls_ssl_ticket_write( void *p_ticket,
bryantaylor 0:eafc3fd41f75 288 const mbedtls_ssl_session *session,
bryantaylor 0:eafc3fd41f75 289 unsigned char *start,
bryantaylor 0:eafc3fd41f75 290 const unsigned char *end,
bryantaylor 0:eafc3fd41f75 291 size_t *tlen,
bryantaylor 0:eafc3fd41f75 292 uint32_t *ticket_lifetime )
bryantaylor 0:eafc3fd41f75 293 {
bryantaylor 0:eafc3fd41f75 294 int ret;
bryantaylor 0:eafc3fd41f75 295 mbedtls_ssl_ticket_context *ctx = p_ticket;
bryantaylor 0:eafc3fd41f75 296 mbedtls_ssl_ticket_key *key;
bryantaylor 0:eafc3fd41f75 297 unsigned char *key_name = start;
bryantaylor 0:eafc3fd41f75 298 unsigned char *iv = start + 4;
bryantaylor 0:eafc3fd41f75 299 unsigned char *state_len_bytes = iv + 12;
bryantaylor 0:eafc3fd41f75 300 unsigned char *state = state_len_bytes + 2;
bryantaylor 0:eafc3fd41f75 301 unsigned char *tag;
bryantaylor 0:eafc3fd41f75 302 size_t clear_len, ciph_len;
bryantaylor 0:eafc3fd41f75 303
bryantaylor 0:eafc3fd41f75 304 *tlen = 0;
bryantaylor 0:eafc3fd41f75 305
bryantaylor 0:eafc3fd41f75 306 if( ctx == NULL || ctx->f_rng == NULL )
bryantaylor 0:eafc3fd41f75 307 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
bryantaylor 0:eafc3fd41f75 308
bryantaylor 0:eafc3fd41f75 309 /* We need at least 4 bytes for key_name, 12 for IV, 2 for len 16 for tag,
bryantaylor 0:eafc3fd41f75 310 * in addition to session itself, that will be checked when writing it. */
bryantaylor 0:eafc3fd41f75 311 if( end - start < 4 + 12 + 2 + 16 )
bryantaylor 0:eafc3fd41f75 312 return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
bryantaylor 0:eafc3fd41f75 313
bryantaylor 0:eafc3fd41f75 314 #if defined(MBEDTLS_THREADING_C)
bryantaylor 0:eafc3fd41f75 315 if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
bryantaylor 0:eafc3fd41f75 316 return( ret );
bryantaylor 0:eafc3fd41f75 317 #endif
bryantaylor 0:eafc3fd41f75 318
bryantaylor 0:eafc3fd41f75 319 if( ( ret = ssl_ticket_update_keys( ctx ) ) != 0 )
bryantaylor 0:eafc3fd41f75 320 goto cleanup;
bryantaylor 0:eafc3fd41f75 321
bryantaylor 0:eafc3fd41f75 322 key = &ctx->keys[ctx->active];
bryantaylor 0:eafc3fd41f75 323
bryantaylor 0:eafc3fd41f75 324 *ticket_lifetime = ctx->ticket_lifetime;
bryantaylor 0:eafc3fd41f75 325
bryantaylor 0:eafc3fd41f75 326 memcpy( key_name, key->name, 4 );
bryantaylor 0:eafc3fd41f75 327
bryantaylor 0:eafc3fd41f75 328 if( ( ret = ctx->f_rng( ctx->p_rng, iv, 12 ) ) != 0 )
bryantaylor 0:eafc3fd41f75 329 goto cleanup;
bryantaylor 0:eafc3fd41f75 330
bryantaylor 0:eafc3fd41f75 331 /* Dump session state */
bryantaylor 0:eafc3fd41f75 332 if( ( ret = ssl_save_session( session,
bryantaylor 0:eafc3fd41f75 333 state, end - state, &clear_len ) ) != 0 ||
bryantaylor 0:eafc3fd41f75 334 (unsigned long) clear_len > 65535 )
bryantaylor 0:eafc3fd41f75 335 {
bryantaylor 0:eafc3fd41f75 336 goto cleanup;
bryantaylor 0:eafc3fd41f75 337 }
bryantaylor 0:eafc3fd41f75 338 state_len_bytes[0] = ( clear_len >> 8 ) & 0xff;
bryantaylor 0:eafc3fd41f75 339 state_len_bytes[1] = ( clear_len ) & 0xff;
bryantaylor 0:eafc3fd41f75 340
bryantaylor 0:eafc3fd41f75 341 /* Encrypt and authenticate */
bryantaylor 0:eafc3fd41f75 342 tag = state + clear_len;
bryantaylor 0:eafc3fd41f75 343 if( ( ret = mbedtls_cipher_auth_encrypt( &key->ctx,
bryantaylor 0:eafc3fd41f75 344 iv, 12, key_name, 4 + 12 + 2,
bryantaylor 0:eafc3fd41f75 345 state, clear_len, state, &ciph_len, tag, 16 ) ) != 0 )
bryantaylor 0:eafc3fd41f75 346 {
bryantaylor 0:eafc3fd41f75 347 goto cleanup;
bryantaylor 0:eafc3fd41f75 348 }
bryantaylor 0:eafc3fd41f75 349 if( ciph_len != clear_len )
bryantaylor 0:eafc3fd41f75 350 {
bryantaylor 0:eafc3fd41f75 351 ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR;
bryantaylor 0:eafc3fd41f75 352 goto cleanup;
bryantaylor 0:eafc3fd41f75 353 }
bryantaylor 0:eafc3fd41f75 354
bryantaylor 0:eafc3fd41f75 355 *tlen = 4 + 12 + 2 + 16 + ciph_len;
bryantaylor 0:eafc3fd41f75 356
bryantaylor 0:eafc3fd41f75 357 cleanup:
bryantaylor 0:eafc3fd41f75 358 #if defined(MBEDTLS_THREADING_C)
bryantaylor 0:eafc3fd41f75 359 if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
bryantaylor 0:eafc3fd41f75 360 return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
bryantaylor 0:eafc3fd41f75 361 #endif
bryantaylor 0:eafc3fd41f75 362
bryantaylor 0:eafc3fd41f75 363 return( ret );
bryantaylor 0:eafc3fd41f75 364 }
bryantaylor 0:eafc3fd41f75 365
bryantaylor 0:eafc3fd41f75 366 /*
bryantaylor 0:eafc3fd41f75 367 * Select key based on name
bryantaylor 0:eafc3fd41f75 368 */
bryantaylor 0:eafc3fd41f75 369 static mbedtls_ssl_ticket_key *ssl_ticket_select_key(
bryantaylor 0:eafc3fd41f75 370 mbedtls_ssl_ticket_context *ctx,
bryantaylor 0:eafc3fd41f75 371 const unsigned char name[4] )
bryantaylor 0:eafc3fd41f75 372 {
bryantaylor 0:eafc3fd41f75 373 unsigned char i;
bryantaylor 0:eafc3fd41f75 374
bryantaylor 0:eafc3fd41f75 375 for( i = 0; i < sizeof( ctx->keys ) / sizeof( *ctx->keys ); i++ )
bryantaylor 0:eafc3fd41f75 376 if( memcmp( name, ctx->keys[i].name, 4 ) == 0 )
bryantaylor 0:eafc3fd41f75 377 return( &ctx->keys[i] );
bryantaylor 0:eafc3fd41f75 378
bryantaylor 0:eafc3fd41f75 379 return( NULL );
bryantaylor 0:eafc3fd41f75 380 }
bryantaylor 0:eafc3fd41f75 381
bryantaylor 0:eafc3fd41f75 382 /*
bryantaylor 0:eafc3fd41f75 383 * Load session ticket (see mbedtls_ssl_ticket_write for structure)
bryantaylor 0:eafc3fd41f75 384 */
bryantaylor 0:eafc3fd41f75 385 int mbedtls_ssl_ticket_parse( void *p_ticket,
bryantaylor 0:eafc3fd41f75 386 mbedtls_ssl_session *session,
bryantaylor 0:eafc3fd41f75 387 unsigned char *buf,
bryantaylor 0:eafc3fd41f75 388 size_t len )
bryantaylor 0:eafc3fd41f75 389 {
bryantaylor 0:eafc3fd41f75 390 int ret;
bryantaylor 0:eafc3fd41f75 391 mbedtls_ssl_ticket_context *ctx = p_ticket;
bryantaylor 0:eafc3fd41f75 392 mbedtls_ssl_ticket_key *key;
bryantaylor 0:eafc3fd41f75 393 unsigned char *key_name = buf;
bryantaylor 0:eafc3fd41f75 394 unsigned char *iv = buf + 4;
bryantaylor 0:eafc3fd41f75 395 unsigned char *enc_len_p = iv + 12;
bryantaylor 0:eafc3fd41f75 396 unsigned char *ticket = enc_len_p + 2;
bryantaylor 0:eafc3fd41f75 397 unsigned char *tag;
bryantaylor 0:eafc3fd41f75 398 size_t enc_len, clear_len;
bryantaylor 0:eafc3fd41f75 399
bryantaylor 0:eafc3fd41f75 400 if( ctx == NULL || ctx->f_rng == NULL )
bryantaylor 0:eafc3fd41f75 401 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
bryantaylor 0:eafc3fd41f75 402
bryantaylor 0:eafc3fd41f75 403 /* See mbedtls_ssl_ticket_write() */
bryantaylor 0:eafc3fd41f75 404 if( len < 4 + 12 + 2 + 16 )
bryantaylor 0:eafc3fd41f75 405 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
bryantaylor 0:eafc3fd41f75 406
bryantaylor 0:eafc3fd41f75 407 #if defined(MBEDTLS_THREADING_C)
bryantaylor 0:eafc3fd41f75 408 if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 )
bryantaylor 0:eafc3fd41f75 409 return( ret );
bryantaylor 0:eafc3fd41f75 410 #endif
bryantaylor 0:eafc3fd41f75 411
bryantaylor 0:eafc3fd41f75 412 if( ( ret = ssl_ticket_update_keys( ctx ) ) != 0 )
bryantaylor 0:eafc3fd41f75 413 goto cleanup;
bryantaylor 0:eafc3fd41f75 414
bryantaylor 0:eafc3fd41f75 415 enc_len = ( enc_len_p[0] << 8 ) | enc_len_p[1];
bryantaylor 0:eafc3fd41f75 416 tag = ticket + enc_len;
bryantaylor 0:eafc3fd41f75 417
bryantaylor 0:eafc3fd41f75 418 if( len != 4 + 12 + 2 + enc_len + 16 )
bryantaylor 0:eafc3fd41f75 419 {
bryantaylor 0:eafc3fd41f75 420 ret = MBEDTLS_ERR_SSL_BAD_INPUT_DATA;
bryantaylor 0:eafc3fd41f75 421 goto cleanup;
bryantaylor 0:eafc3fd41f75 422 }
bryantaylor 0:eafc3fd41f75 423
bryantaylor 0:eafc3fd41f75 424 /* Select key */
bryantaylor 0:eafc3fd41f75 425 if( ( key = ssl_ticket_select_key( ctx, key_name ) ) == NULL )
bryantaylor 0:eafc3fd41f75 426 {
bryantaylor 0:eafc3fd41f75 427 /* We can't know for sure but this is a likely option unless we're
bryantaylor 0:eafc3fd41f75 428 * under attack - this is only informative anyway */
bryantaylor 0:eafc3fd41f75 429 ret = MBEDTLS_ERR_SSL_SESSION_TICKET_EXPIRED;
bryantaylor 0:eafc3fd41f75 430 goto cleanup;
bryantaylor 0:eafc3fd41f75 431 }
bryantaylor 0:eafc3fd41f75 432
bryantaylor 0:eafc3fd41f75 433 /* Decrypt and authenticate */
bryantaylor 0:eafc3fd41f75 434 if( ( ret = mbedtls_cipher_auth_decrypt( &key->ctx, iv, 12,
bryantaylor 0:eafc3fd41f75 435 key_name, 4 + 12 + 2, ticket, enc_len,
bryantaylor 0:eafc3fd41f75 436 ticket, &clear_len, tag, 16 ) ) != 0 )
bryantaylor 0:eafc3fd41f75 437 {
bryantaylor 0:eafc3fd41f75 438 if( ret == MBEDTLS_ERR_CIPHER_AUTH_FAILED )
bryantaylor 0:eafc3fd41f75 439 ret = MBEDTLS_ERR_SSL_INVALID_MAC;
bryantaylor 0:eafc3fd41f75 440
bryantaylor 0:eafc3fd41f75 441 goto cleanup;
bryantaylor 0:eafc3fd41f75 442 }
bryantaylor 0:eafc3fd41f75 443 if( clear_len != enc_len )
bryantaylor 0:eafc3fd41f75 444 {
bryantaylor 0:eafc3fd41f75 445 ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR;
bryantaylor 0:eafc3fd41f75 446 goto cleanup;
bryantaylor 0:eafc3fd41f75 447 }
bryantaylor 0:eafc3fd41f75 448
bryantaylor 0:eafc3fd41f75 449 /* Actually load session */
bryantaylor 0:eafc3fd41f75 450 if( ( ret = ssl_load_session( session, ticket, clear_len ) ) != 0 )
bryantaylor 0:eafc3fd41f75 451 goto cleanup;
bryantaylor 0:eafc3fd41f75 452
bryantaylor 0:eafc3fd41f75 453 #if defined(MBEDTLS_HAVE_TIME)
bryantaylor 0:eafc3fd41f75 454 {
bryantaylor 0:eafc3fd41f75 455 /* Check for expiration */
bryantaylor 0:eafc3fd41f75 456 mbedtls_time_t current_time = mbedtls_time( NULL );
bryantaylor 0:eafc3fd41f75 457
bryantaylor 0:eafc3fd41f75 458 if( current_time < session->start ||
bryantaylor 0:eafc3fd41f75 459 (uint32_t)( current_time - session->start ) > ctx->ticket_lifetime )
bryantaylor 0:eafc3fd41f75 460 {
bryantaylor 0:eafc3fd41f75 461 ret = MBEDTLS_ERR_SSL_SESSION_TICKET_EXPIRED;
bryantaylor 0:eafc3fd41f75 462 goto cleanup;
bryantaylor 0:eafc3fd41f75 463 }
bryantaylor 0:eafc3fd41f75 464 }
bryantaylor 0:eafc3fd41f75 465 #endif
bryantaylor 0:eafc3fd41f75 466
bryantaylor 0:eafc3fd41f75 467 cleanup:
bryantaylor 0:eafc3fd41f75 468 #if defined(MBEDTLS_THREADING_C)
bryantaylor 0:eafc3fd41f75 469 if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 )
bryantaylor 0:eafc3fd41f75 470 return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
bryantaylor 0:eafc3fd41f75 471 #endif
bryantaylor 0:eafc3fd41f75 472
bryantaylor 0:eafc3fd41f75 473 return( ret );
bryantaylor 0:eafc3fd41f75 474 }
bryantaylor 0:eafc3fd41f75 475
bryantaylor 0:eafc3fd41f75 476 /*
bryantaylor 0:eafc3fd41f75 477 * Free context
bryantaylor 0:eafc3fd41f75 478 */
bryantaylor 0:eafc3fd41f75 479 void mbedtls_ssl_ticket_free( mbedtls_ssl_ticket_context *ctx )
bryantaylor 0:eafc3fd41f75 480 {
bryantaylor 0:eafc3fd41f75 481 mbedtls_cipher_free( &ctx->keys[0].ctx );
bryantaylor 0:eafc3fd41f75 482 mbedtls_cipher_free( &ctx->keys[1].ctx );
bryantaylor 0:eafc3fd41f75 483
bryantaylor 0:eafc3fd41f75 484 #if defined(MBEDTLS_THREADING_C)
bryantaylor 0:eafc3fd41f75 485 mbedtls_mutex_free( &ctx->mutex );
bryantaylor 0:eafc3fd41f75 486 #endif
bryantaylor 0:eafc3fd41f75 487
bryantaylor 0:eafc3fd41f75 488 mbedtls_zeroize( ctx, sizeof( mbedtls_ssl_ticket_context ) );
bryantaylor 0:eafc3fd41f75 489 }
bryantaylor 0:eafc3fd41f75 490
bryantaylor 0:eafc3fd41f75 491 #endif /* MBEDTLS_SSL_TICKET_C */