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12657cdcc646aefeaeae89c52812e0b224731dd9
mbedtls/library/ssl_ticket.c
Dave Rodgman 2a045325f9 Merge pull request #5766 from leorosen/fix-var-init 
Add missing local variable initialization
2022-05-16 14:47:00 +01:00

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/*
* 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 "ssl_misc.h"
#include "mbedtls/ssl_ticket.h"
#include "mbedtls/error.h"
#include "mbedtls/platform_util.h"
#include <string.h>
/*
* Initialize 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 MBEDTLS_SSL_TICKET_MAX_KEY_BYTES
#define TICKET_KEY_NAME_BYTES MBEDTLS_SSL_TICKET_KEY_NAME_BYTES
#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] = {0};
mbedtls_ssl_ticket_key *key = ctx->keys + index;
#if defined(MBEDTLS_USE_PSA_CRYPTO)
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
#endif
#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 );
#if defined(MBEDTLS_USE_PSA_CRYPTO)
psa_set_key_usage_flags( &attributes,
PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT );
psa_set_key_algorithm( &attributes, key->alg );
psa_set_key_type( &attributes, key->key_type );
psa_set_key_bits( &attributes, key->key_bits );
ret = psa_ssl_status_to_mbedtls(
psa_import_key( &attributes, buf,
PSA_BITS_TO_BYTES( key->key_bits ),
&key->key ) );
#else
/* 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 );
#endif /* MBEDTLS_USE_PSA_CRYPTO */
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 defined(MBEDTLS_USE_PSA_CRYPTO)
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
#endif
if( current_time >= key_time &&
current_time - key_time < ctx->ticket_lifetime )
{
return( 0 );
}
ctx->active = 1 - ctx->active;
#if defined(MBEDTLS_USE_PSA_CRYPTO)
if( ( status = psa_destroy_key( ctx->keys[ctx->active].key ) ) != PSA_SUCCESS )
{
return psa_ssl_status_to_mbedtls( status );
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
return( ssl_ticket_gen_key( ctx, ctx->active ) );
}
else
#endif /* MBEDTLS_HAVE_TIME */
return( 0 );
}
/*
* Rotate active session ticket encryption key
*/
int mbedtls_ssl_ticket_rotate( mbedtls_ssl_ticket_context *ctx,
const unsigned char *name, size_t nlength,
const unsigned char *k, size_t klength,
uint32_t lifetime )
{
const unsigned char idx = 1 - ctx->active;
mbedtls_ssl_ticket_key * const key = ctx->keys + idx;
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
#if defined(MBEDTLS_USE_PSA_CRYPTO)
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
const size_t bitlen = key->key_bits;
#else
const int bitlen = mbedtls_cipher_get_key_bitlen( &key->ctx );
#endif
if( nlength < TICKET_KEY_NAME_BYTES || klength * 8 < (size_t)bitlen )
return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA );
#if defined(MBEDTLS_USE_PSA_CRYPTO)
if( ( status = psa_destroy_key( key->key ) ) != PSA_SUCCESS )
{
ret = psa_ssl_status_to_mbedtls( status );
return( ret );
}
psa_set_key_usage_flags( &attributes,
PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT );
psa_set_key_algorithm( &attributes, key->alg );
psa_set_key_type( &attributes, key->key_type );
psa_set_key_bits( &attributes, key->key_bits );
if( ( status = psa_import_key( &attributes, k,
PSA_BITS_TO_BYTES( key->key_bits ),
&key->key ) ) != PSA_SUCCESS )
{
ret = psa_ssl_status_to_mbedtls( status );
return( ret );
}
#else
ret = mbedtls_cipher_setkey( &key->ctx, k, bitlen, MBEDTLS_ENCRYPT );
if( ret != 0 )
return( ret );
#endif /* MBEDTLS_USE_PSA_CRYPTO */
ctx->active = idx;
ctx->ticket_lifetime = lifetime;
memcpy( key->name, name, TICKET_KEY_NAME_BYTES );
#if defined(MBEDTLS_HAVE_TIME)
key->generation_time = (uint32_t) mbedtls_time( NULL );
#endif
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;
size_t key_bits;
#if defined(MBEDTLS_USE_PSA_CRYPTO)
psa_algorithm_t alg;
psa_key_type_t key_type;
#else
const mbedtls_cipher_info_t *cipher_info;
#endif /* MBEDTLS_USE_PSA_CRYPTO */
#if defined(MBEDTLS_USE_PSA_CRYPTO)
if( mbedtls_ssl_cipher_to_psa( cipher, TICKET_AUTH_TAG_BYTES,
&alg, &key_type, &key_bits ) != PSA_SUCCESS )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
if( PSA_ALG_IS_AEAD( alg ) == 0 )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
#else
cipher_info = mbedtls_cipher_info_from_type( cipher );
if( mbedtls_cipher_info_get_mode( cipher_info ) != MBEDTLS_MODE_GCM &&
mbedtls_cipher_info_get_mode( cipher_info ) != MBEDTLS_MODE_CCM &&
mbedtls_cipher_info_get_mode( cipher_info ) != MBEDTLS_MODE_CHACHAPOLY )
{
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
}
key_bits = mbedtls_cipher_info_get_key_bitlen( cipher_info );
#endif /* MBEDTLS_USE_PSA_CRYPTO */
if( key_bits > 8 * MAX_KEY_BYTES )
return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
ctx->f_rng = f_rng;
ctx->p_rng = p_rng;
ctx->ticket_lifetime = lifetime;
#if defined(MBEDTLS_USE_PSA_CRYPTO)
ctx->keys[0].alg = alg;
ctx->keys[0].key_type = key_type;
ctx->keys[0].key_bits = key_bits;
ctx->keys[1].alg = alg;
ctx->keys[1].key_type = key_type;
ctx->keys[1].key_bits = key_bits;
#else
if( ( ret = mbedtls_cipher_setup( &ctx->keys[0].ctx, cipher_info ) ) != 0 )
return( ret );
if( ( ret = mbedtls_cipher_setup( &ctx->keys[1].ctx, cipher_info ) ) != 0 )
return( ret );
#endif /* MBEDTLS_USE_PSA_CRYPTO */
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;
#if defined(MBEDTLS_USE_PSA_CRYPTO)
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
#endif
*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;
}
MBEDTLS_PUT_UINT16_BE( clear_len, state_len_bytes, 0 );
/* Encrypt and authenticate */
#if defined(MBEDTLS_USE_PSA_CRYPTO)
if( ( status = psa_aead_encrypt( key->key, key->alg, iv, TICKET_IV_BYTES,
key_name, TICKET_ADD_DATA_LEN,
state, clear_len,
state, end - state,
&ciph_len ) ) != PSA_SUCCESS )
{
ret = psa_ssl_status_to_mbedtls( status );
goto cleanup;
}
#else
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;
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
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 defined(MBEDTLS_USE_PSA_CRYPTO)
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
#endif
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 defined(MBEDTLS_USE_PSA_CRYPTO)
if( ( status = psa_aead_decrypt( key->key, key->alg, iv, TICKET_IV_BYTES,
key_name, TICKET_ADD_DATA_LEN,
ticket, enc_len + TICKET_AUTH_TAG_BYTES,
ticket, enc_len, &clear_len ) ) != PSA_SUCCESS )
{
ret = psa_ssl_status_to_mbedtls( status );
goto cleanup;
}
#else
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;
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
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 )
{
#if defined(MBEDTLS_USE_PSA_CRYPTO)
psa_destroy_key( ctx->keys[0].key );
psa_destroy_key( ctx->keys[1].key );
#else
mbedtls_cipher_free( &ctx->keys[0].ctx );
mbedtls_cipher_free( &ctx->keys[1].ctx );
#endif /* MBEDTLS_USE_PSA_CRYPTO */
#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 */
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