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mbedtls/library/psa_crypto_cipher.c
Gilles Peskine 42649d9270 Fix NULL+0 undefined behavior in ECB encryption and decryption 
psa_cipher_encrypt() and psa_cipher_decrypt() sometimes add a zero offset to
a null pointer when the cipher does not use an IV. This is undefined
behavior, although it works as naively expected on most platforms. This
can cause a crash with modern Clang+ASan (depending on compiler optimizations).

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
2022-11-23 14:16:52 +01:00

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/*
* PSA cipher driver entry points
*/
/*
* 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_PSA_CRYPTO_C)
#include "psa_crypto_cipher.h"
#include "psa_crypto_core.h"
#include "psa_crypto_random_impl.h"
#include "mbedtls/cipher.h"
#include "mbedtls/error.h"
#include <string.h>
const mbedtls_cipher_info_t *mbedtls_cipher_info_from_psa(
psa_algorithm_t alg,
psa_key_type_t key_type,
size_t key_bits,
mbedtls_cipher_id_t* cipher_id )
{
mbedtls_cipher_mode_t mode;
mbedtls_cipher_id_t cipher_id_tmp;
if( PSA_ALG_IS_AEAD( alg ) )
alg = PSA_ALG_AEAD_WITH_SHORTENED_TAG( alg, 0 );
if( PSA_ALG_IS_CIPHER( alg ) || PSA_ALG_IS_AEAD( alg ) )
{
switch( alg )
{
#if defined(MBEDTLS_PSA_BUILTIN_ALG_STREAM_CIPHER)
case PSA_ALG_STREAM_CIPHER:
mode = MBEDTLS_MODE_STREAM;
break;
#endif
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CTR)
case PSA_ALG_CTR:
mode = MBEDTLS_MODE_CTR;
break;
#endif
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CFB)
case PSA_ALG_CFB:
mode = MBEDTLS_MODE_CFB;
break;
#endif
#if defined(MBEDTLS_PSA_BUILTIN_ALG_OFB)
case PSA_ALG_OFB:
mode = MBEDTLS_MODE_OFB;
break;
#endif
#if defined(MBEDTLS_PSA_BUILTIN_ALG_ECB_NO_PADDING)
case PSA_ALG_ECB_NO_PADDING:
mode = MBEDTLS_MODE_ECB;
break;
#endif
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CBC_NO_PADDING)
case PSA_ALG_CBC_NO_PADDING:
mode = MBEDTLS_MODE_CBC;
break;
#endif
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CBC_PKCS7)
case PSA_ALG_CBC_PKCS7:
mode = MBEDTLS_MODE_CBC;
break;
#endif
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CCM_STAR_NO_TAG)
case PSA_ALG_CCM_STAR_NO_TAG:
mode = MBEDTLS_MODE_CCM_STAR_NO_TAG;
break;
#endif
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CCM)
case PSA_ALG_AEAD_WITH_SHORTENED_TAG( PSA_ALG_CCM, 0 ):
mode = MBEDTLS_MODE_CCM;
break;
#endif
#if defined(MBEDTLS_PSA_BUILTIN_ALG_GCM)
case PSA_ALG_AEAD_WITH_SHORTENED_TAG( PSA_ALG_GCM, 0 ):
mode = MBEDTLS_MODE_GCM;
break;
#endif
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305)
case PSA_ALG_AEAD_WITH_SHORTENED_TAG( PSA_ALG_CHACHA20_POLY1305, 0 ):
mode = MBEDTLS_MODE_CHACHAPOLY;
break;
#endif
default:
return( NULL );
}
}
else if( alg == PSA_ALG_CMAC )
mode = MBEDTLS_MODE_ECB;
else
return( NULL );
switch( key_type )
{
#if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_AES)
case PSA_KEY_TYPE_AES:
cipher_id_tmp = MBEDTLS_CIPHER_ID_AES;
break;
#endif
#if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ARIA)
case PSA_KEY_TYPE_ARIA:
cipher_id_tmp = MBEDTLS_CIPHER_ID_ARIA;
break;
#endif
#if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_DES)
case PSA_KEY_TYPE_DES:
/* key_bits is 64 for Single-DES, 128 for two-key Triple-DES,
* and 192 for three-key Triple-DES. */
if( key_bits == 64 )
cipher_id_tmp = MBEDTLS_CIPHER_ID_DES;
else
cipher_id_tmp = MBEDTLS_CIPHER_ID_3DES;
/* mbedtls doesn't recognize two-key Triple-DES as an algorithm,
* but two-key Triple-DES is functionally three-key Triple-DES
* with K1=K3, so that's how we present it to mbedtls. */
if( key_bits == 128 )
key_bits = 192;
break;
#endif
#if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_CAMELLIA)
case PSA_KEY_TYPE_CAMELLIA:
cipher_id_tmp = MBEDTLS_CIPHER_ID_CAMELLIA;
break;
#endif
#if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_CHACHA20)
case PSA_KEY_TYPE_CHACHA20:
cipher_id_tmp = MBEDTLS_CIPHER_ID_CHACHA20;
break;
#endif
default:
return( NULL );
}
if( cipher_id != NULL )
*cipher_id = cipher_id_tmp;
return( mbedtls_cipher_info_from_values( cipher_id_tmp,
(int) key_bits, mode ) );
}
#if defined(MBEDTLS_PSA_BUILTIN_CIPHER)
static psa_status_t psa_cipher_setup(
mbedtls_psa_cipher_operation_t *operation,
const psa_key_attributes_t *attributes,
const uint8_t *key_buffer, size_t key_buffer_size,
psa_algorithm_t alg,
mbedtls_operation_t cipher_operation )
{
int ret = 0;
size_t key_bits;
const mbedtls_cipher_info_t *cipher_info = NULL;
psa_key_type_t key_type = attributes->core.type;
(void)key_buffer_size;
mbedtls_cipher_init( &operation->ctx.cipher );
operation->alg = alg;
key_bits = attributes->core.bits;
cipher_info = mbedtls_cipher_info_from_psa( alg, key_type,
key_bits, NULL );
if( cipher_info == NULL )
return( PSA_ERROR_NOT_SUPPORTED );
ret = mbedtls_cipher_setup( &operation->ctx.cipher, cipher_info );
if( ret != 0 )
goto exit;
#if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_DES)
if( key_type == PSA_KEY_TYPE_DES && key_bits == 128 )
{
/* Two-key Triple-DES is 3-key Triple-DES with K1=K3 */
uint8_t keys[24];
memcpy( keys, key_buffer, 16 );
memcpy( keys + 16, key_buffer, 8 );
ret = mbedtls_cipher_setkey( &operation->ctx.cipher,
keys,
192, cipher_operation );
}
else
#endif
{
ret = mbedtls_cipher_setkey( &operation->ctx.cipher, key_buffer,
(int) key_bits, cipher_operation );
}
if( ret != 0 )
goto exit;
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CBC_NO_PADDING) || \
defined(MBEDTLS_PSA_BUILTIN_ALG_CBC_PKCS7)
switch( alg )
{
case PSA_ALG_CBC_NO_PADDING:
ret = mbedtls_cipher_set_padding_mode( &operation->ctx.cipher,
MBEDTLS_PADDING_NONE );
break;
case PSA_ALG_CBC_PKCS7:
ret = mbedtls_cipher_set_padding_mode( &operation->ctx.cipher,
MBEDTLS_PADDING_PKCS7 );
break;
default:
/* The algorithm doesn't involve padding. */
ret = 0;
break;
}
if( ret != 0 )
goto exit;
#endif /* MBEDTLS_PSA_BUILTIN_ALG_CBC_NO_PADDING ||
MBEDTLS_PSA_BUILTIN_ALG_CBC_PKCS7 */
operation->block_length = ( PSA_ALG_IS_STREAM_CIPHER( alg ) ? 1 :
PSA_BLOCK_CIPHER_BLOCK_LENGTH( key_type ) );
operation->iv_length = PSA_CIPHER_IV_LENGTH( key_type, alg );
exit:
return( mbedtls_to_psa_error( ret ) );
}
psa_status_t mbedtls_psa_cipher_encrypt_setup(
mbedtls_psa_cipher_operation_t *operation,
const psa_key_attributes_t *attributes,
const uint8_t *key_buffer, size_t key_buffer_size,
psa_algorithm_t alg )
{
return( psa_cipher_setup( operation, attributes,
key_buffer, key_buffer_size,
alg, MBEDTLS_ENCRYPT ) );
}
psa_status_t mbedtls_psa_cipher_decrypt_setup(
mbedtls_psa_cipher_operation_t *operation,
const psa_key_attributes_t *attributes,
const uint8_t *key_buffer, size_t key_buffer_size,
psa_algorithm_t alg )
{
return( psa_cipher_setup( operation, attributes,
key_buffer, key_buffer_size,
alg, MBEDTLS_DECRYPT ) );
}
psa_status_t mbedtls_psa_cipher_set_iv(
mbedtls_psa_cipher_operation_t *operation,
const uint8_t *iv, size_t iv_length )
{
if( iv_length != operation->iv_length )
return( PSA_ERROR_INVALID_ARGUMENT );
return( mbedtls_to_psa_error(
mbedtls_cipher_set_iv( &operation->ctx.cipher,
iv, iv_length ) ) );
}
#if defined(MBEDTLS_PSA_BUILTIN_ALG_ECB_NO_PADDING)
/** Process input for which the algorithm is set to ECB mode.
*
* This requires manual processing, since the PSA API is defined as being
* able to process arbitrary-length calls to psa_cipher_update() with ECB mode,
* but the underlying mbedtls_cipher_update only takes full blocks.
*
* \param ctx The mbedtls cipher context to use. It must have been
* set up for ECB.
* \param[in] input The input plaintext or ciphertext to process.
* \param input_length The number of bytes to process from \p input.
* This does not need to be aligned to a block boundary.
* If there is a partial block at the end of the input,
* it is stored in \p ctx for future processing.
* \param output The buffer where the output is written. It must be
* at least `BS * floor((p + input_length) / BS)` bytes
* long, where `p` is the number of bytes in the
* unprocessed partial block in \p ctx (with
* `0 <= p <= BS - 1`) and `BS` is the block size.
* \param output_length On success, the number of bytes written to \p output.
* \c 0 on error.
*
* \return #PSA_SUCCESS or an error from a hardware accelerator
*/
static psa_status_t psa_cipher_update_ecb(
mbedtls_cipher_context_t *ctx,
const uint8_t *input,
size_t input_length,
uint8_t *output,
size_t *output_length )
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
size_t block_size = ctx->cipher_info->block_size;
size_t internal_output_length = 0;
*output_length = 0;
if( input_length == 0 )
{
status = PSA_SUCCESS;
goto exit;
}
if( ctx->unprocessed_len > 0 )
{
/* Fill up to block size, and run the block if there's a full one. */
size_t bytes_to_copy = block_size - ctx->unprocessed_len;
if( input_length < bytes_to_copy )
bytes_to_copy = input_length;
memcpy( &( ctx->unprocessed_data[ctx->unprocessed_len] ),
input, bytes_to_copy );
input_length -= bytes_to_copy;
input += bytes_to_copy;
ctx->unprocessed_len += bytes_to_copy;
if( ctx->unprocessed_len == block_size )
{
status = mbedtls_to_psa_error(
mbedtls_cipher_update( ctx,
ctx->unprocessed_data,
block_size,
output, &internal_output_length ) );
if( status != PSA_SUCCESS )
goto exit;
output += internal_output_length;
*output_length += internal_output_length;
ctx->unprocessed_len = 0;
}
}
while( input_length >= block_size )
{
/* Run all full blocks we have, one by one */
status = mbedtls_to_psa_error(
mbedtls_cipher_update( ctx, input,
block_size,
output, &internal_output_length ) );
if( status != PSA_SUCCESS )
goto exit;
input_length -= block_size;
input += block_size;
output += internal_output_length;
*output_length += internal_output_length;
}
if( input_length > 0 )
{
/* Save unprocessed bytes for later processing */
memcpy( &( ctx->unprocessed_data[ctx->unprocessed_len] ),
input, input_length );
ctx->unprocessed_len += input_length;
}
status = PSA_SUCCESS;
exit:
return( status );
}
#endif /* MBEDTLS_PSA_BUILTIN_ALG_ECB_NO_PADDING */
psa_status_t mbedtls_psa_cipher_update(
mbedtls_psa_cipher_operation_t *operation,
const uint8_t *input, size_t input_length,
uint8_t *output, size_t output_size, size_t *output_length )
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
size_t expected_output_size;
if( ! PSA_ALG_IS_STREAM_CIPHER( operation->alg ) )
{
/* Take the unprocessed partial block left over from previous
* update calls, if any, plus the input to this call. Remove
* the last partial block, if any. You get the data that will be
* output in this call. */
expected_output_size =
( operation->ctx.cipher.unprocessed_len + input_length )
/ operation->block_length * operation->block_length;
}
else
{
expected_output_size = input_length;
}
if( output_size < expected_output_size )
return( PSA_ERROR_BUFFER_TOO_SMALL );
#if defined(MBEDTLS_PSA_BUILTIN_ALG_ECB_NO_PADDING)
if( operation->alg == PSA_ALG_ECB_NO_PADDING )
{
/* mbedtls_cipher_update has an API inconsistency: it will only
* process a single block at a time in ECB mode. Abstract away that
* inconsistency here to match the PSA API behaviour. */
status = psa_cipher_update_ecb( &operation->ctx.cipher,
input,
input_length,
output,
output_length );
}
else
#endif /* MBEDTLS_PSA_BUILTIN_ALG_ECB_NO_PADDING */
{
status = mbedtls_to_psa_error(
mbedtls_cipher_update( &operation->ctx.cipher, input,
input_length, output, output_length ) );
if( *output_length > output_size )
return( PSA_ERROR_CORRUPTION_DETECTED );
}
return( status );
}
psa_status_t mbedtls_psa_cipher_finish(
mbedtls_psa_cipher_operation_t *operation,
uint8_t *output, size_t output_size, size_t *output_length )
{
psa_status_t status = PSA_ERROR_GENERIC_ERROR;
uint8_t temp_output_buffer[MBEDTLS_MAX_BLOCK_LENGTH];
if( operation->ctx.cipher.unprocessed_len != 0 )
{
if( operation->alg == PSA_ALG_ECB_NO_PADDING ||
operation->alg == PSA_ALG_CBC_NO_PADDING )
{
status = PSA_ERROR_INVALID_ARGUMENT;
goto exit;
}
}
status = mbedtls_to_psa_error(
mbedtls_cipher_finish( &operation->ctx.cipher,
temp_output_buffer,
output_length ) );
if( status != PSA_SUCCESS )
goto exit;
if( *output_length == 0 )
; /* Nothing to copy. Note that output may be NULL in this case. */
else if( output_size >= *output_length )
memcpy( output, temp_output_buffer, *output_length );
else
status = PSA_ERROR_BUFFER_TOO_SMALL;
exit:
mbedtls_platform_zeroize( temp_output_buffer,
sizeof( temp_output_buffer ) );
return( status );
}
psa_status_t mbedtls_psa_cipher_abort(
mbedtls_psa_cipher_operation_t *operation )
{
/* Sanity check (shouldn't happen: operation->alg should
* always have been initialized to a valid value). */
if( ! PSA_ALG_IS_CIPHER( operation->alg ) )
return( PSA_ERROR_BAD_STATE );
mbedtls_cipher_free( &operation->ctx.cipher );
return( PSA_SUCCESS );
}
psa_status_t mbedtls_psa_cipher_encrypt(
const psa_key_attributes_t *attributes,
const uint8_t *key_buffer,
size_t key_buffer_size,
psa_algorithm_t alg,
const uint8_t *iv,
size_t iv_length,
const uint8_t *input,
size_t input_length,
uint8_t *output,
size_t output_size,
size_t *output_length )
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
mbedtls_psa_cipher_operation_t operation = MBEDTLS_PSA_CIPHER_OPERATION_INIT;
size_t update_output_length, finish_output_length;
status = mbedtls_psa_cipher_encrypt_setup( &operation, attributes,
key_buffer, key_buffer_size,
alg );
if( status != PSA_SUCCESS )
goto exit;
if( iv_length > 0 )
{
status = mbedtls_psa_cipher_set_iv( &operation, iv, iv_length );
if( status != PSA_SUCCESS )
goto exit;
}
status = mbedtls_psa_cipher_update( &operation, input, input_length,
output, output_size,
&update_output_length );
if( status != PSA_SUCCESS )
goto exit;
status = mbedtls_psa_cipher_finish(
&operation,
mbedtls_buffer_offset( output, update_output_length ),
output_size - update_output_length, &finish_output_length );
if( status != PSA_SUCCESS )
goto exit;
*output_length = update_output_length + finish_output_length;
exit:
if( status == PSA_SUCCESS )
status = mbedtls_psa_cipher_abort( &operation );
else
mbedtls_psa_cipher_abort( &operation );
return( status );
}
psa_status_t mbedtls_psa_cipher_decrypt(
const psa_key_attributes_t *attributes,
const uint8_t *key_buffer,
size_t key_buffer_size,
psa_algorithm_t alg,
const uint8_t *input,
size_t input_length,
uint8_t *output,
size_t output_size,
size_t *output_length )
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
mbedtls_psa_cipher_operation_t operation = MBEDTLS_PSA_CIPHER_OPERATION_INIT;
size_t olength, accumulated_length;
status = mbedtls_psa_cipher_decrypt_setup( &operation, attributes,
key_buffer, key_buffer_size,
alg );
if( status != PSA_SUCCESS )
goto exit;
if( operation.iv_length > 0 )
{
status = mbedtls_psa_cipher_set_iv( &operation,
input, operation.iv_length );
if( status != PSA_SUCCESS )
goto exit;
}
status = mbedtls_psa_cipher_update(
&operation,
mbedtls_buffer_offset_const( input, operation.iv_length ),
input_length - operation.iv_length,
output, output_size, &olength );
if( status != PSA_SUCCESS )
goto exit;
accumulated_length = olength;
status = mbedtls_psa_cipher_finish(
&operation,
mbedtls_buffer_offset( output, accumulated_length ),
output_size - accumulated_length, &olength );
if( status != PSA_SUCCESS )
goto exit;
*output_length = accumulated_length + olength;
exit:
if ( status == PSA_SUCCESS )
status = mbedtls_psa_cipher_abort( &operation );
else
mbedtls_psa_cipher_abort( &operation );
return( status );
}
#endif /* MBEDTLS_PSA_BUILTIN_CIPHER */
#endif /* MBEDTLS_PSA_CRYPTO_C */
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