diff options
Diffstat (limited to 'lib/mbedtls-2.27.0/library/ssl_ticket.c')
| -rw-r--r-- | lib/mbedtls-2.27.0/library/ssl_ticket.c | 405 |
1 files changed, 0 insertions, 405 deletions
diff --git a/lib/mbedtls-2.27.0/library/ssl_ticket.c b/lib/mbedtls-2.27.0/library/ssl_ticket.c deleted file mode 100644 index 626d137..0000000 --- a/lib/mbedtls-2.27.0/library/ssl_ticket.c +++ /dev/null @@ -1,405 +0,0 @@ -/* - * TLS server tickets callbacks implementation - * - * Copyright The Mbed TLS Contributors - * SPDX-License-Identifier: Apache-2.0 - * - * Licensed under the Apache License, Version 2.0 (the "License"); you may - * not use this file except in compliance with the License. - * You may obtain a copy of the License at - * - * http://www.apache.org/licenses/LICENSE-2.0 - * - * Unless required by applicable law or agreed to in writing, software - * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT - * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. - * See the License for the specific language governing permissions and - * limitations under the License. - */ - -#include "common.h" - -#if defined(MBEDTLS_SSL_TICKET_C) - -#if defined(MBEDTLS_PLATFORM_C) -#include "mbedtls/platform.h" -#else -#include <stdlib.h> -#define mbedtls_calloc calloc -#define mbedtls_free free -#endif - -#include "mbedtls/ssl_internal.h" -#include "mbedtls/ssl_ticket.h" -#include "mbedtls/error.h" -#include "mbedtls/platform_util.h" - -#include <string.h> - -/* - * Initialze context - */ -void mbedtls_ssl_ticket_init( mbedtls_ssl_ticket_context *ctx ) -{ - memset( ctx, 0, sizeof( mbedtls_ssl_ticket_context ) ); - -#if defined(MBEDTLS_THREADING_C) - mbedtls_mutex_init( &ctx->mutex ); -#endif -} - -#define MAX_KEY_BYTES 32 /* 256 bits */ - -#define TICKET_KEY_NAME_BYTES 4 -#define TICKET_IV_BYTES 12 -#define TICKET_CRYPT_LEN_BYTES 2 -#define TICKET_AUTH_TAG_BYTES 16 - -#define TICKET_MIN_LEN ( TICKET_KEY_NAME_BYTES + \ - TICKET_IV_BYTES + \ - TICKET_CRYPT_LEN_BYTES + \ - TICKET_AUTH_TAG_BYTES ) -#define TICKET_ADD_DATA_LEN ( TICKET_KEY_NAME_BYTES + \ - TICKET_IV_BYTES + \ - TICKET_CRYPT_LEN_BYTES ) - -/* - * Generate/update a key - */ -static int ssl_ticket_gen_key( mbedtls_ssl_ticket_context *ctx, - unsigned char index ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - unsigned char buf[MAX_KEY_BYTES]; - mbedtls_ssl_ticket_key *key = ctx->keys + index; - -#if defined(MBEDTLS_HAVE_TIME) - key->generation_time = (uint32_t) mbedtls_time( NULL ); -#endif - - if( ( ret = ctx->f_rng( ctx->p_rng, key->name, sizeof( key->name ) ) ) != 0 ) - return( ret ); - - if( ( ret = ctx->f_rng( ctx->p_rng, buf, sizeof( buf ) ) ) != 0 ) - return( ret ); - - /* With GCM and CCM, same context can encrypt & decrypt */ - ret = mbedtls_cipher_setkey( &key->ctx, buf, - mbedtls_cipher_get_key_bitlen( &key->ctx ), - MBEDTLS_ENCRYPT ); - - mbedtls_platform_zeroize( buf, sizeof( buf ) ); - - return( ret ); -} - -/* - * Rotate/generate keys if necessary - */ -static int ssl_ticket_update_keys( mbedtls_ssl_ticket_context *ctx ) -{ -#if !defined(MBEDTLS_HAVE_TIME) - ((void) ctx); -#else - if( ctx->ticket_lifetime != 0 ) - { - uint32_t current_time = (uint32_t) mbedtls_time( NULL ); - uint32_t key_time = ctx->keys[ctx->active].generation_time; - - if( current_time >= key_time && - current_time - key_time < ctx->ticket_lifetime ) - { - return( 0 ); - } - - ctx->active = 1 - ctx->active; - - return( ssl_ticket_gen_key( ctx, ctx->active ) ); - } - else -#endif /* MBEDTLS_HAVE_TIME */ - return( 0 ); -} - -/* - * Setup context for actual use - */ -int mbedtls_ssl_ticket_setup( mbedtls_ssl_ticket_context *ctx, - int (*f_rng)(void *, unsigned char *, size_t), void *p_rng, - mbedtls_cipher_type_t cipher, - uint32_t lifetime ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - const mbedtls_cipher_info_t *cipher_info; - - ctx->f_rng = f_rng; - ctx->p_rng = p_rng; - - ctx->ticket_lifetime = lifetime; - - cipher_info = mbedtls_cipher_info_from_type( cipher); - if( cipher_info == NULL ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - if( cipher_info->mode != MBEDTLS_MODE_GCM && - cipher_info->mode != MBEDTLS_MODE_CCM ) - { - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - } - - if( cipher_info->key_bitlen > 8 * MAX_KEY_BYTES ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - -#if defined(MBEDTLS_USE_PSA_CRYPTO) - ret = mbedtls_cipher_setup_psa( &ctx->keys[0].ctx, - cipher_info, TICKET_AUTH_TAG_BYTES ); - if( ret != 0 && ret != MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE ) - return( ret ); - /* We don't yet expect to support all ciphers through PSA, - * so allow fallback to ordinary mbedtls_cipher_setup(). */ - if( ret == MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE ) -#endif /* MBEDTLS_USE_PSA_CRYPTO */ - if( ( ret = mbedtls_cipher_setup( &ctx->keys[0].ctx, cipher_info ) ) != 0 ) - return( ret ); - -#if defined(MBEDTLS_USE_PSA_CRYPTO) - ret = mbedtls_cipher_setup_psa( &ctx->keys[1].ctx, - cipher_info, TICKET_AUTH_TAG_BYTES ); - if( ret != 0 && ret != MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE ) - return( ret ); - if( ret == MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE ) -#endif /* MBEDTLS_USE_PSA_CRYPTO */ - if( ( ret = mbedtls_cipher_setup( &ctx->keys[1].ctx, cipher_info ) ) != 0 ) - return( ret ); - - if( ( ret = ssl_ticket_gen_key( ctx, 0 ) ) != 0 || - ( ret = ssl_ticket_gen_key( ctx, 1 ) ) != 0 ) - { - return( ret ); - } - - return( 0 ); -} - -/* - * Create session ticket, with the following structure: - * - * struct { - * opaque key_name[4]; - * opaque iv[12]; - * opaque encrypted_state<0..2^16-1>; - * opaque tag[16]; - * } ticket; - * - * The key_name, iv, and length of encrypted_state are the additional - * authenticated data. - */ - -int mbedtls_ssl_ticket_write( void *p_ticket, - const mbedtls_ssl_session *session, - unsigned char *start, - const unsigned char *end, - size_t *tlen, - uint32_t *ticket_lifetime ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - mbedtls_ssl_ticket_context *ctx = p_ticket; - mbedtls_ssl_ticket_key *key; - unsigned char *key_name = start; - unsigned char *iv = start + TICKET_KEY_NAME_BYTES; - unsigned char *state_len_bytes = iv + TICKET_IV_BYTES; - unsigned char *state = state_len_bytes + TICKET_CRYPT_LEN_BYTES; - size_t clear_len, ciph_len; - - *tlen = 0; - - if( ctx == NULL || ctx->f_rng == NULL ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - /* We need at least 4 bytes for key_name, 12 for IV, 2 for len 16 for tag, - * in addition to session itself, that will be checked when writing it. */ - MBEDTLS_SSL_CHK_BUF_PTR( start, end, TICKET_MIN_LEN ); - -#if defined(MBEDTLS_THREADING_C) - if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 ) - return( ret ); -#endif - - if( ( ret = ssl_ticket_update_keys( ctx ) ) != 0 ) - goto cleanup; - - key = &ctx->keys[ctx->active]; - - *ticket_lifetime = ctx->ticket_lifetime; - - memcpy( key_name, key->name, TICKET_KEY_NAME_BYTES ); - - if( ( ret = ctx->f_rng( ctx->p_rng, iv, TICKET_IV_BYTES ) ) != 0 ) - goto cleanup; - - /* Dump session state */ - if( ( ret = mbedtls_ssl_session_save( session, - state, end - state, - &clear_len ) ) != 0 || - (unsigned long) clear_len > 65535 ) - { - goto cleanup; - } - state_len_bytes[0] = ( clear_len >> 8 ) & 0xff; - state_len_bytes[1] = ( clear_len ) & 0xff; - - /* Encrypt and authenticate */ - if( ( ret = mbedtls_cipher_auth_encrypt_ext( &key->ctx, - iv, TICKET_IV_BYTES, - /* Additional data: key name, IV and length */ - key_name, TICKET_ADD_DATA_LEN, - state, clear_len, - state, end - state, &ciph_len, - TICKET_AUTH_TAG_BYTES ) ) != 0 ) - { - goto cleanup; - } - if( ciph_len != clear_len + TICKET_AUTH_TAG_BYTES ) - { - ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR; - goto cleanup; - } - - *tlen = TICKET_MIN_LEN + ciph_len - TICKET_AUTH_TAG_BYTES; - -cleanup: -#if defined(MBEDTLS_THREADING_C) - if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 ) - return( MBEDTLS_ERR_THREADING_MUTEX_ERROR ); -#endif - - return( ret ); -} - -/* - * Select key based on name - */ -static mbedtls_ssl_ticket_key *ssl_ticket_select_key( - mbedtls_ssl_ticket_context *ctx, - const unsigned char name[4] ) -{ - unsigned char i; - - for( i = 0; i < sizeof( ctx->keys ) / sizeof( *ctx->keys ); i++ ) - if( memcmp( name, ctx->keys[i].name, 4 ) == 0 ) - return( &ctx->keys[i] ); - - return( NULL ); -} - -/* - * Load session ticket (see mbedtls_ssl_ticket_write for structure) - */ -int mbedtls_ssl_ticket_parse( void *p_ticket, - mbedtls_ssl_session *session, - unsigned char *buf, - size_t len ) -{ - int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; - mbedtls_ssl_ticket_context *ctx = p_ticket; - mbedtls_ssl_ticket_key *key; - unsigned char *key_name = buf; - unsigned char *iv = buf + TICKET_KEY_NAME_BYTES; - unsigned char *enc_len_p = iv + TICKET_IV_BYTES; - unsigned char *ticket = enc_len_p + TICKET_CRYPT_LEN_BYTES; - size_t enc_len, clear_len; - - if( ctx == NULL || ctx->f_rng == NULL ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - - if( len < TICKET_MIN_LEN ) - return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA ); - -#if defined(MBEDTLS_THREADING_C) - if( ( ret = mbedtls_mutex_lock( &ctx->mutex ) ) != 0 ) - return( ret ); -#endif - - if( ( ret = ssl_ticket_update_keys( ctx ) ) != 0 ) - goto cleanup; - - enc_len = ( enc_len_p[0] << 8 ) | enc_len_p[1]; - - if( len != TICKET_MIN_LEN + enc_len ) - { - ret = MBEDTLS_ERR_SSL_BAD_INPUT_DATA; - goto cleanup; - } - - /* Select key */ - if( ( key = ssl_ticket_select_key( ctx, key_name ) ) == NULL ) - { - /* We can't know for sure but this is a likely option unless we're - * under attack - this is only informative anyway */ - ret = MBEDTLS_ERR_SSL_SESSION_TICKET_EXPIRED; - goto cleanup; - } - - /* Decrypt and authenticate */ - if( ( ret = mbedtls_cipher_auth_decrypt_ext( &key->ctx, - iv, TICKET_IV_BYTES, - /* Additional data: key name, IV and length */ - key_name, TICKET_ADD_DATA_LEN, - ticket, enc_len + TICKET_AUTH_TAG_BYTES, - ticket, enc_len, &clear_len, - TICKET_AUTH_TAG_BYTES ) ) != 0 ) - { - if( ret == MBEDTLS_ERR_CIPHER_AUTH_FAILED ) - ret = MBEDTLS_ERR_SSL_INVALID_MAC; - - goto cleanup; - } - if( clear_len != enc_len ) - { - ret = MBEDTLS_ERR_SSL_INTERNAL_ERROR; - goto cleanup; - } - - /* Actually load session */ - if( ( ret = mbedtls_ssl_session_load( session, ticket, clear_len ) ) != 0 ) - goto cleanup; - -#if defined(MBEDTLS_HAVE_TIME) - { - /* Check for expiration */ - mbedtls_time_t current_time = mbedtls_time( NULL ); - - if( current_time < session->start || - (uint32_t)( current_time - session->start ) > ctx->ticket_lifetime ) - { - ret = MBEDTLS_ERR_SSL_SESSION_TICKET_EXPIRED; - goto cleanup; - } - } -#endif - -cleanup: -#if defined(MBEDTLS_THREADING_C) - if( mbedtls_mutex_unlock( &ctx->mutex ) != 0 ) - return( MBEDTLS_ERR_THREADING_MUTEX_ERROR ); -#endif - - return( ret ); -} - -/* - * Free context - */ -void mbedtls_ssl_ticket_free( mbedtls_ssl_ticket_context *ctx ) -{ - mbedtls_cipher_free( &ctx->keys[0].ctx ); - mbedtls_cipher_free( &ctx->keys[1].ctx ); - -#if defined(MBEDTLS_THREADING_C) - mbedtls_mutex_free( &ctx->mutex ); -#endif - - mbedtls_platform_zeroize( ctx, sizeof( mbedtls_ssl_ticket_context ) ); -} - -#endif /* MBEDTLS_SSL_TICKET_C */ |