[398] | 1 | /*
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| 2 | * SSL session cache implementation
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| 3 | *
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| 4 | * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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| 5 | * SPDX-License-Identifier: Apache-2.0
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| 6 | *
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| 7 | * Licensed under the Apache License, Version 2.0 (the "License"); you may
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| 8 | * not use this file except in compliance with the License.
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| 9 | * You may obtain a copy of the License at
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| 10 | *
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| 11 | * http://www.apache.org/licenses/LICENSE-2.0
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| 12 | *
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| 13 | * Unless required by applicable law or agreed to in writing, software
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| 14 | * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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| 15 | * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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| 16 | * See the License for the specific language governing permissions and
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| 17 | * limitations under the License.
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| 18 | *
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| 19 | * This file is part of mbed TLS (https://tls.mbed.org)
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| 20 | */
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| 21 | /*
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| 22 | * These session callbacks use a simple chained list
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| 23 | * to store and retrieve the session information.
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| 24 | */
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| 25 |
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| 26 | #if !defined(MBEDTLS_CONFIG_FILE)
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| 27 | #include "mbedtls/config.h"
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| 28 | #else
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| 29 | #include MBEDTLS_CONFIG_FILE
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| 30 | #endif
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| 31 |
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| 32 | #if defined(MBEDTLS_SSL_CACHE_C)
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| 33 |
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| 34 | #if defined(MBEDTLS_PLATFORM_C)
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| 35 | #include "mbedtls/platform.h"
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| 36 | #else
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| 37 | #include <stdlib.h>
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| 38 | #define mbedtls_calloc calloc
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| 39 | #define mbedtls_free free
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| 40 | #endif
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| 41 |
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| 42 | #include "mbedtls/ssl_cache.h"
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| 43 |
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| 44 | #include <string.h>
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| 45 |
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| 46 | void mbedtls_ssl_cache_init( mbedtls_ssl_cache_context *cache )
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| 47 | {
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| 48 | memset( cache, 0, sizeof( mbedtls_ssl_cache_context ) );
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| 49 |
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| 50 | cache->timeout = MBEDTLS_SSL_CACHE_DEFAULT_TIMEOUT;
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| 51 | cache->max_entries = MBEDTLS_SSL_CACHE_DEFAULT_MAX_ENTRIES;
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| 52 |
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| 53 | #if defined(MBEDTLS_THREADING_C)
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| 54 | mbedtls_mutex_init( &cache->mutex );
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| 55 | #endif
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| 56 | }
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| 57 |
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| 58 | int mbedtls_ssl_cache_get( void *data, mbedtls_ssl_session *session )
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| 59 | {
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| 60 | int ret = 1;
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| 61 | #if defined(MBEDTLS_HAVE_TIME)
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| 62 | mbedtls_time_t t = mbedtls_time( NULL );
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| 63 | #endif
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| 64 | mbedtls_ssl_cache_context *cache = (mbedtls_ssl_cache_context *) data;
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| 65 | mbedtls_ssl_cache_entry *cur, *entry;
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| 66 |
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| 67 | #if defined(MBEDTLS_THREADING_C)
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| 68 | if( mbedtls_mutex_lock( &cache->mutex ) != 0 )
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| 69 | return( 1 );
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| 70 | #endif
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| 71 |
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| 72 | cur = cache->chain;
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| 73 | entry = NULL;
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| 74 |
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| 75 | while( cur != NULL )
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| 76 | {
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| 77 | entry = cur;
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| 78 | cur = cur->next;
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| 79 |
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| 80 | #if defined(MBEDTLS_HAVE_TIME)
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| 81 | if( cache->timeout != 0 &&
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| 82 | (int) ( t - entry->timestamp ) > cache->timeout )
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| 83 | continue;
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| 84 | #endif
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| 85 |
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| 86 | if( session->ciphersuite != entry->session.ciphersuite ||
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| 87 | session->compression != entry->session.compression ||
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| 88 | session->id_len != entry->session.id_len )
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| 89 | continue;
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| 90 |
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| 91 | if( memcmp( session->id, entry->session.id,
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| 92 | entry->session.id_len ) != 0 )
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| 93 | continue;
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| 94 |
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| 95 | memcpy( session->master, entry->session.master, 48 );
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| 96 |
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| 97 | session->verify_result = entry->session.verify_result;
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| 98 |
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| 99 | #if defined(MBEDTLS_X509_CRT_PARSE_C)
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| 100 | /*
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| 101 | * Restore peer certificate (without rest of the original chain)
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| 102 | */
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| 103 | if( entry->peer_cert.p != NULL )
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| 104 | {
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| 105 | if( ( session->peer_cert = mbedtls_calloc( 1,
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| 106 | sizeof(mbedtls_x509_crt) ) ) == NULL )
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| 107 | {
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| 108 | ret = 1;
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| 109 | goto exit;
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| 110 | }
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| 111 |
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| 112 | mbedtls_x509_crt_init( session->peer_cert );
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| 113 | if( mbedtls_x509_crt_parse( session->peer_cert, entry->peer_cert.p,
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| 114 | entry->peer_cert.len ) != 0 )
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| 115 | {
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| 116 | mbedtls_free( session->peer_cert );
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| 117 | session->peer_cert = NULL;
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| 118 | ret = 1;
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| 119 | goto exit;
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| 120 | }
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| 121 | }
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| 122 | #endif /* MBEDTLS_X509_CRT_PARSE_C */
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| 123 |
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| 124 | ret = 0;
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| 125 | goto exit;
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| 126 | }
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| 127 |
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| 128 | exit:
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| 129 | #if defined(MBEDTLS_THREADING_C)
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| 130 | if( mbedtls_mutex_unlock( &cache->mutex ) != 0 )
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| 131 | ret = 1;
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| 132 | #endif
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| 133 |
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| 134 | return( ret );
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| 135 | }
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| 136 |
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| 137 | int mbedtls_ssl_cache_set( void *data, const mbedtls_ssl_session *session )
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| 138 | {
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| 139 | int ret = 1;
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| 140 | #if defined(MBEDTLS_HAVE_TIME)
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| 141 | mbedtls_time_t t = mbedtls_time( NULL ), oldest = 0;
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| 142 | mbedtls_ssl_cache_entry *old = NULL;
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| 143 | #endif
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| 144 | mbedtls_ssl_cache_context *cache = (mbedtls_ssl_cache_context *) data;
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| 145 | mbedtls_ssl_cache_entry *cur, *prv;
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| 146 | int count = 0;
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| 147 |
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| 148 | #if defined(MBEDTLS_THREADING_C)
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| 149 | if( ( ret = mbedtls_mutex_lock( &cache->mutex ) ) != 0 )
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| 150 | return( ret );
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| 151 | #endif
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| 152 |
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| 153 | cur = cache->chain;
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| 154 | prv = NULL;
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| 155 |
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| 156 | while( cur != NULL )
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| 157 | {
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| 158 | count++;
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| 159 |
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| 160 | #if defined(MBEDTLS_HAVE_TIME)
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| 161 | if( cache->timeout != 0 &&
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| 162 | (int) ( t - cur->timestamp ) > cache->timeout )
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| 163 | {
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| 164 | cur->timestamp = t;
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| 165 | break; /* expired, reuse this slot, update timestamp */
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| 166 | }
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| 167 | #endif
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| 168 |
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| 169 | if( memcmp( session->id, cur->session.id, cur->session.id_len ) == 0 )
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| 170 | break; /* client reconnected, keep timestamp for session id */
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| 171 |
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| 172 | #if defined(MBEDTLS_HAVE_TIME)
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| 173 | if( oldest == 0 || cur->timestamp < oldest )
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| 174 | {
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| 175 | oldest = cur->timestamp;
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| 176 | old = cur;
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| 177 | }
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| 178 | #endif
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| 179 |
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| 180 | prv = cur;
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| 181 | cur = cur->next;
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| 182 | }
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| 183 |
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| 184 | if( cur == NULL )
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| 185 | {
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| 186 | #if defined(MBEDTLS_HAVE_TIME)
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| 187 | /*
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| 188 | * Reuse oldest entry if max_entries reached
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| 189 | */
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| 190 | if( count >= cache->max_entries )
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| 191 | {
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| 192 | if( old == NULL )
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| 193 | {
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| 194 | ret = 1;
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| 195 | goto exit;
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| 196 | }
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| 197 |
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| 198 | cur = old;
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| 199 | }
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| 200 | #else /* MBEDTLS_HAVE_TIME */
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| 201 | /*
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| 202 | * Reuse first entry in chain if max_entries reached,
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| 203 | * but move to last place
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| 204 | */
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| 205 | if( count >= cache->max_entries )
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| 206 | {
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| 207 | if( cache->chain == NULL )
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| 208 | {
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| 209 | ret = 1;
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| 210 | goto exit;
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| 211 | }
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| 212 |
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| 213 | cur = cache->chain;
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| 214 | cache->chain = cur->next;
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| 215 | cur->next = NULL;
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| 216 | prv->next = cur;
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| 217 | }
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| 218 | #endif /* MBEDTLS_HAVE_TIME */
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| 219 | else
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| 220 | {
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| 221 | /*
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| 222 | * max_entries not reached, create new entry
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| 223 | */
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| 224 | cur = mbedtls_calloc( 1, sizeof(mbedtls_ssl_cache_entry) );
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| 225 | if( cur == NULL )
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| 226 | {
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| 227 | ret = 1;
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| 228 | goto exit;
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| 229 | }
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| 230 |
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| 231 | if( prv == NULL )
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| 232 | cache->chain = cur;
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| 233 | else
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| 234 | prv->next = cur;
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| 235 | }
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| 236 |
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| 237 | #if defined(MBEDTLS_HAVE_TIME)
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| 238 | cur->timestamp = t;
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| 239 | #endif
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| 240 | }
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| 241 |
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| 242 | memcpy( &cur->session, session, sizeof( mbedtls_ssl_session ) );
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| 243 |
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| 244 | #if defined(MBEDTLS_X509_CRT_PARSE_C)
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| 245 | /*
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| 246 | * If we're reusing an entry, free its certificate first
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| 247 | */
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| 248 | if( cur->peer_cert.p != NULL )
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| 249 | {
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| 250 | mbedtls_free( cur->peer_cert.p );
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| 251 | memset( &cur->peer_cert, 0, sizeof(mbedtls_x509_buf) );
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| 252 | }
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| 253 |
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| 254 | /*
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| 255 | * Store peer certificate
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| 256 | */
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| 257 | if( session->peer_cert != NULL )
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| 258 | {
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| 259 | cur->peer_cert.p = mbedtls_calloc( 1, session->peer_cert->raw.len );
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| 260 | if( cur->peer_cert.p == NULL )
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| 261 | {
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| 262 | ret = 1;
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| 263 | goto exit;
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| 264 | }
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| 265 |
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| 266 | memcpy( cur->peer_cert.p, session->peer_cert->raw.p,
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| 267 | session->peer_cert->raw.len );
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| 268 | cur->peer_cert.len = session->peer_cert->raw.len;
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| 269 |
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| 270 | cur->session.peer_cert = NULL;
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| 271 | }
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| 272 | #endif /* MBEDTLS_X509_CRT_PARSE_C */
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| 273 |
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| 274 | ret = 0;
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| 275 |
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| 276 | exit:
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| 277 | #if defined(MBEDTLS_THREADING_C)
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| 278 | if( mbedtls_mutex_unlock( &cache->mutex ) != 0 )
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| 279 | ret = 1;
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| 280 | #endif
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| 281 |
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| 282 | return( ret );
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| 283 | }
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| 284 |
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| 285 | #if defined(MBEDTLS_HAVE_TIME)
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| 286 | void mbedtls_ssl_cache_set_timeout( mbedtls_ssl_cache_context *cache, int timeout )
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| 287 | {
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| 288 | if( timeout < 0 ) timeout = 0;
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| 289 |
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| 290 | cache->timeout = timeout;
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| 291 | }
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| 292 | #endif /* MBEDTLS_HAVE_TIME */
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| 293 |
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| 294 | void mbedtls_ssl_cache_set_max_entries( mbedtls_ssl_cache_context *cache, int max )
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| 295 | {
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| 296 | if( max < 0 ) max = 0;
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| 297 |
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| 298 | cache->max_entries = max;
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| 299 | }
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| 300 |
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| 301 | void mbedtls_ssl_cache_free( mbedtls_ssl_cache_context *cache )
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| 302 | {
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| 303 | mbedtls_ssl_cache_entry *cur, *prv;
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| 304 |
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| 305 | cur = cache->chain;
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| 306 |
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| 307 | while( cur != NULL )
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| 308 | {
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| 309 | prv = cur;
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| 310 | cur = cur->next;
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| 311 |
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| 312 | mbedtls_ssl_session_free( &prv->session );
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| 313 |
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| 314 | #if defined(MBEDTLS_X509_CRT_PARSE_C)
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| 315 | mbedtls_free( prv->peer_cert.p );
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| 316 | #endif /* MBEDTLS_X509_CRT_PARSE_C */
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| 317 |
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| 318 | mbedtls_free( prv );
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| 319 | }
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| 320 |
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| 321 | #if defined(MBEDTLS_THREADING_C)
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| 322 | mbedtls_mutex_free( &cache->mutex );
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| 323 | #endif
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| 324 | cache->chain = NULL;
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| 325 | }
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| 326 |
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| 327 | #endif /* MBEDTLS_SSL_CACHE_C */
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