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mbedtls/tests/suites/test_suite_ccm.function
Gilles Peskine b168c0d2e6 More robust code to set the IV 
Check that the source address and the frame counter have the expected
length. Otherwise, if the test data was invalid, the test code could
build nonsensical inputs, potentially overflowing the iv buffer.

The primary benefit of this change is that it also silences a warning
from compiling with `gcc-10 -O3` (observed with GCC 10.2.0 on
Linux/amd64). GCC unrolled the loops and complained about a buffer
overflow with warnings like:
```
suites/test_suite_ccm.function: In function 'test_mbedtls_ccm_star_auth_decrypt':
suites/test_suite_ccm.function:271:15: error: writing 1 byte into a region of size 0 [-Werror=stringop-overflow=]
  271 |         iv[i] = source_address->x[i];
      |         ~~~~~~^~~~~~~~~~~~~~~~~~~~~~
suites/test_suite_ccm.function:254:19: note: at offset [13, 14] to object 'iv' with size 13 declared here
  254 |     unsigned char iv[13];
```
Just using memcpy instead of loops bypasses this warnings. The added
checks are a bonus.

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
2021-02-09 12:00:13 +01:00

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/* BEGIN_HEADER */
#include "mbedtls/ccm.h"
/* END_HEADER */
/* BEGIN_DEPENDENCIES
* depends_on:MBEDTLS_CCM_C
* END_DEPENDENCIES
*/
/* BEGIN_CASE depends_on:MBEDTLS_SELF_TEST:MBEDTLS_AES_C */
void mbedtls_ccm_self_test( )
{
TEST_ASSERT( mbedtls_ccm_self_test( 1 ) == 0 );
}
/* END_CASE */
/* BEGIN_CASE */
void mbedtls_ccm_setkey( int cipher_id, int key_size, int result )
{
mbedtls_ccm_context ctx;
unsigned char key[32];
int ret;
mbedtls_ccm_init( &ctx );
memset( key, 0x2A, sizeof( key ) );
TEST_ASSERT( (unsigned) key_size <= 8 * sizeof( key ) );
ret = mbedtls_ccm_setkey( &ctx, cipher_id, key, key_size );
TEST_ASSERT( ret == result );
exit:
mbedtls_ccm_free( &ctx );
}
/* END_CASE */
/* BEGIN_CASE depends_on:MBEDTLS_AES_C */
void ccm_lengths( int msg_len, int iv_len, int add_len, int tag_len, int res )
{
mbedtls_ccm_context ctx;
unsigned char key[16];
unsigned char msg[10];
unsigned char iv[14];
unsigned char *add = NULL;
unsigned char out[10];
unsigned char tag[18];
int decrypt_ret;
mbedtls_ccm_init( &ctx );
ASSERT_ALLOC_WEAK( add, add_len );
memset( key, 0, sizeof( key ) );
memset( msg, 0, sizeof( msg ) );
memset( iv, 0, sizeof( iv ) );
memset( out, 0, sizeof( out ) );
memset( tag, 0, sizeof( tag ) );
TEST_ASSERT( mbedtls_ccm_setkey( &ctx, MBEDTLS_CIPHER_ID_AES,
key, 8 * sizeof( key ) ) == 0 );
TEST_ASSERT( mbedtls_ccm_encrypt_and_tag( &ctx, msg_len, iv, iv_len, add, add_len,
msg, out, tag, tag_len ) == res );
decrypt_ret = mbedtls_ccm_auth_decrypt( &ctx, msg_len, iv, iv_len, add, add_len,
msg, out, tag, tag_len );
if( res == 0 )
TEST_ASSERT( decrypt_ret == MBEDTLS_ERR_CCM_AUTH_FAILED );
else
TEST_ASSERT( decrypt_ret == res );
exit:
mbedtls_free( add );
mbedtls_ccm_free( &ctx );
}
/* END_CASE */
/* BEGIN_CASE depends_on:MBEDTLS_AES_C */
void ccm_star_lengths( int msg_len, int iv_len, int add_len, int tag_len,
int res )
{
mbedtls_ccm_context ctx;
unsigned char key[16];
unsigned char msg[10];
unsigned char iv[14];
unsigned char add[10];
unsigned char out[10];
unsigned char tag[18];
int decrypt_ret;
mbedtls_ccm_init( &ctx );
memset( key, 0, sizeof( key ) );
memset( msg, 0, sizeof( msg ) );
memset( iv, 0, sizeof( iv ) );
memset( add, 0, sizeof( add ) );
memset( out, 0, sizeof( out ) );
memset( tag, 0, sizeof( tag ) );
TEST_ASSERT( mbedtls_ccm_setkey( &ctx, MBEDTLS_CIPHER_ID_AES,
key, 8 * sizeof( key ) ) == 0 );
TEST_ASSERT( mbedtls_ccm_star_encrypt_and_tag( &ctx, msg_len, iv, iv_len,
add, add_len, msg, out, tag, tag_len ) == res );
decrypt_ret = mbedtls_ccm_star_auth_decrypt( &ctx, msg_len, iv, iv_len, add,
add_len, msg, out, tag, tag_len );
if( res == 0 && tag_len != 0 )
TEST_ASSERT( decrypt_ret == MBEDTLS_ERR_CCM_AUTH_FAILED );
else
TEST_ASSERT( decrypt_ret == res );
exit:
mbedtls_ccm_free( &ctx );
}
/* END_CASE */
/* BEGIN_CASE */
void mbedtls_ccm_encrypt_and_tag( int cipher_id, data_t * key,
data_t * msg, data_t * iv,
data_t * add, data_t * result )
{
mbedtls_ccm_context ctx;
size_t tag_len;
uint8_t * msg_n_tag = (uint8_t *)malloc( result->len + 2 );
mbedtls_ccm_init( &ctx );
memset( msg_n_tag, 0, result->len + 2 );
memcpy( msg_n_tag, msg->x, msg->len );
tag_len = result->len - msg->len;
TEST_ASSERT( mbedtls_ccm_setkey( &ctx, cipher_id, key->x, key->len * 8 ) == 0 );
/* Test with input == output */
TEST_ASSERT( mbedtls_ccm_encrypt_and_tag( &ctx, msg->len, iv->x, iv->len, add->x, add->len,
msg_n_tag, msg_n_tag, msg_n_tag + msg->len, tag_len ) == 0 );
TEST_ASSERT( memcmp( msg_n_tag, result->x, result->len ) == 0 );
/* Check we didn't write past the end */
TEST_ASSERT( msg_n_tag[result->len] == 0 && msg_n_tag[result->len + 1] == 0 );
exit:
mbedtls_ccm_free( &ctx );
free( msg_n_tag );
}
/* END_CASE */
/* BEGIN_CASE */
void mbedtls_ccm_auth_decrypt( int cipher_id, data_t * key,
data_t * msg, data_t * iv,
data_t * add, int tag_len, int result,
data_t * expected_msg )
{
unsigned char tag[16];
mbedtls_ccm_context ctx;
mbedtls_ccm_init( &ctx );
memset( tag, 0x00, sizeof( tag ) );
msg->len -= tag_len;
memcpy( tag, msg->x + msg->len, tag_len );
TEST_ASSERT( mbedtls_ccm_setkey( &ctx, cipher_id, key->x, key->len * 8 ) == 0 );
/* Test with input == output */
TEST_ASSERT( mbedtls_ccm_auth_decrypt( &ctx, msg->len, iv->x, iv->len, add->x, add->len,
msg->x, msg->x, msg->x + msg->len, tag_len ) == result );
if( result == 0 )
{
TEST_ASSERT( memcmp( msg->x, expected_msg->x, expected_msg->len ) == 0 );
}
else
{
size_t i;
for( i = 0; i < msg->len; i++ )
TEST_ASSERT( msg->x[i] == 0 );
}
/* Check we didn't write past the end (where the original tag is) */
TEST_ASSERT( memcmp( msg->x + msg->len, tag, tag_len ) == 0 );
exit:
mbedtls_ccm_free( &ctx );
}
/* END_CASE */
/* BEGIN_CASE */
void mbedtls_ccm_star_encrypt_and_tag( int cipher_id,
data_t *key, data_t *msg,
data_t *source_address, data_t *frame_counter,
int sec_level, data_t *add,
data_t *expected_result, int output_ret )
{
unsigned char iv[13];
unsigned char result[50];
mbedtls_ccm_context ctx;
size_t iv_len, tag_len;
int ret;
mbedtls_ccm_init( &ctx );
memset( result, 0x00, sizeof( result ) );
if( sec_level % 4 == 0)
tag_len = 0;
else
tag_len = 1 << ( sec_level % 4 + 1);
TEST_ASSERT( source_address->len == 8 );
TEST_ASSERT( frame_counter->len == 4 );
memcpy( iv, source_address->x, source_address->len );
memcpy( iv + source_address->len, frame_counter->x, frame_counter->len );
iv[source_address->len + frame_counter->len] = sec_level;
iv_len = sizeof( iv );
TEST_ASSERT( mbedtls_ccm_setkey( &ctx, cipher_id,
key->x, key->len * 8 ) == 0 );
ret = mbedtls_ccm_star_encrypt_and_tag( &ctx, msg->len, iv, iv_len,
add->x, add->len, msg->x,
result, result + msg->len, tag_len );
TEST_ASSERT( ret == output_ret );
TEST_ASSERT( memcmp( result,
expected_result->x, expected_result->len ) == 0 );
/* Check we didn't write past the end */
TEST_ASSERT( result[expected_result->len] == 0 &&
result[expected_result->len + 1] == 0 );
exit:
mbedtls_ccm_free( &ctx );
}
/* END_CASE */
/* BEGIN_CASE */
void mbedtls_ccm_star_auth_decrypt( int cipher_id,
data_t *key, data_t *msg,
data_t *source_address, data_t *frame_counter,
int sec_level, data_t *add,
data_t *expected_result, int output_ret )
{
unsigned char iv[13];
unsigned char result[50];
mbedtls_ccm_context ctx;
size_t iv_len, tag_len;
int ret;
mbedtls_ccm_init( &ctx );
memset( iv, 0x00, sizeof( iv ) );
memset( result, '+', sizeof( result ) );
if( sec_level % 4 == 0)
tag_len = 0;
else
tag_len = 1 << ( sec_level % 4 + 1);
TEST_ASSERT( source_address->len == 8 );
TEST_ASSERT( frame_counter->len == 4 );
memcpy( iv, source_address->x, source_address->len );
memcpy( iv + source_address->len, frame_counter->x, frame_counter->len );
iv[source_address->len + frame_counter->len] = sec_level;
iv_len = sizeof( iv );
TEST_ASSERT( mbedtls_ccm_setkey( &ctx, cipher_id, key->x, key->len * 8 ) == 0 );
ret = mbedtls_ccm_star_auth_decrypt( &ctx, msg->len - tag_len, iv, iv_len,
add->x, add->len, msg->x, result,
msg->x + msg->len - tag_len, tag_len );
TEST_ASSERT( ret == output_ret );
TEST_ASSERT( memcmp( result, expected_result->x,
expected_result->len ) == 0 );
/* Check we didn't write past the end (where the original tag is) */
TEST_ASSERT( ( msg->len + 2 ) <= sizeof( result ) );
TEST_EQUAL( result[msg->len], '+' );
TEST_EQUAL( result[msg->len + 1], '+' );
exit:
mbedtls_ccm_free( &ctx );
}
/* END_CASE */
/* BEGIN_CASE depends_on:MBEDTLS_CHECK_PARAMS:!MBEDTLS_PARAM_FAILED_ALT */
void ccm_invalid_param( )
{
struct mbedtls_ccm_context ctx;
unsigned char valid_buffer[] = { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06 };
mbedtls_cipher_id_t valid_cipher = MBEDTLS_CIPHER_ID_AES;
int valid_len = sizeof(valid_buffer);
int valid_bitlen = valid_len * 8;
mbedtls_ccm_init( &ctx );
/* mbedtls_ccm_init() */
TEST_INVALID_PARAM( mbedtls_ccm_init( NULL ) );
/* mbedtls_ccm_setkey() */
TEST_INVALID_PARAM_RET(
MBEDTLS_ERR_CCM_BAD_INPUT,
mbedtls_ccm_setkey( NULL, valid_cipher, valid_buffer, valid_bitlen ) );
TEST_INVALID_PARAM_RET(
MBEDTLS_ERR_CCM_BAD_INPUT,
mbedtls_ccm_setkey( &ctx, valid_cipher, NULL, valid_bitlen ) );
/* mbedtls_ccm_encrypt_and_tag() */
TEST_INVALID_PARAM_RET(
MBEDTLS_ERR_CCM_BAD_INPUT,
mbedtls_ccm_encrypt_and_tag( NULL, valid_len,
valid_buffer, valid_len,
valid_buffer, valid_len,
valid_buffer, valid_buffer,
valid_buffer, valid_len ) );
TEST_INVALID_PARAM_RET(
MBEDTLS_ERR_CCM_BAD_INPUT,
mbedtls_ccm_encrypt_and_tag( &ctx, valid_len,
NULL, valid_len,
valid_buffer, valid_len,
valid_buffer, valid_buffer,
valid_buffer, valid_len ) );
TEST_INVALID_PARAM_RET(
MBEDTLS_ERR_CCM_BAD_INPUT,
mbedtls_ccm_encrypt_and_tag( &ctx, valid_len,
valid_buffer, valid_len,
NULL, valid_len,
valid_buffer, valid_buffer,
valid_buffer, valid_len ) );
TEST_INVALID_PARAM_RET(
MBEDTLS_ERR_CCM_BAD_INPUT,
mbedtls_ccm_encrypt_and_tag( &ctx, valid_len,
valid_buffer, valid_len,
valid_buffer, valid_len,
NULL, valid_buffer,
valid_buffer, valid_len ) );
TEST_INVALID_PARAM_RET(
MBEDTLS_ERR_CCM_BAD_INPUT,
mbedtls_ccm_encrypt_and_tag( &ctx, valid_len,
valid_buffer, valid_len,
valid_buffer, valid_len,
valid_buffer, NULL,
valid_buffer, valid_len ) );
TEST_INVALID_PARAM_RET(
MBEDTLS_ERR_CCM_BAD_INPUT,
mbedtls_ccm_encrypt_and_tag( &ctx, valid_len,
valid_buffer, valid_len,
valid_buffer, valid_len,
valid_buffer, valid_buffer,
NULL, valid_len ) );
/* mbedtls_ccm_star_encrypt_and_tag() */
TEST_INVALID_PARAM_RET(
MBEDTLS_ERR_CCM_BAD_INPUT,
mbedtls_ccm_star_encrypt_and_tag( NULL, valid_len,
valid_buffer, valid_len,
valid_buffer, valid_len,
valid_buffer, valid_buffer,
valid_buffer, valid_len) );
TEST_INVALID_PARAM_RET(
MBEDTLS_ERR_CCM_BAD_INPUT,
mbedtls_ccm_star_encrypt_and_tag( &ctx, valid_len,
NULL, valid_len,
valid_buffer, valid_len,
valid_buffer, valid_buffer,
valid_buffer, valid_len ) );
TEST_INVALID_PARAM_RET(
MBEDTLS_ERR_CCM_BAD_INPUT,
mbedtls_ccm_star_encrypt_and_tag( &ctx, valid_len,
valid_buffer, valid_len,
NULL, valid_len,
valid_buffer, valid_buffer,
valid_buffer, valid_len ) );
TEST_INVALID_PARAM_RET(
MBEDTLS_ERR_CCM_BAD_INPUT,
mbedtls_ccm_star_encrypt_and_tag( &ctx, valid_len,
valid_buffer, valid_len,
valid_buffer, valid_len,
NULL, valid_buffer,
valid_buffer, valid_len ) );
TEST_INVALID_PARAM_RET(
MBEDTLS_ERR_CCM_BAD_INPUT,
mbedtls_ccm_star_encrypt_and_tag( &ctx, valid_len,
valid_buffer, valid_len,
valid_buffer, valid_len,
valid_buffer, NULL,
valid_buffer, valid_len ) );
TEST_INVALID_PARAM_RET(
MBEDTLS_ERR_CCM_BAD_INPUT,
mbedtls_ccm_star_encrypt_and_tag( &ctx, valid_len,
valid_buffer, valid_len,
valid_buffer, valid_len,
valid_buffer, valid_buffer,
NULL, valid_len ) );
/* mbedtls_ccm_auth_decrypt() */
TEST_INVALID_PARAM_RET(
MBEDTLS_ERR_CCM_BAD_INPUT,
mbedtls_ccm_auth_decrypt( NULL, valid_len,
valid_buffer, valid_len,
valid_buffer, valid_len,
valid_buffer, valid_buffer,
valid_buffer, valid_len ) );
TEST_INVALID_PARAM_RET(
MBEDTLS_ERR_CCM_BAD_INPUT,
mbedtls_ccm_auth_decrypt( &ctx, valid_len,
NULL, valid_len,
valid_buffer, valid_len,
valid_buffer, valid_buffer,
valid_buffer, valid_len ) );
TEST_INVALID_PARAM_RET(
MBEDTLS_ERR_CCM_BAD_INPUT,
mbedtls_ccm_auth_decrypt( &ctx, valid_len,
valid_buffer, valid_len,
NULL, valid_len,
valid_buffer, valid_buffer,
valid_buffer, valid_len ) );
TEST_INVALID_PARAM_RET(
MBEDTLS_ERR_CCM_BAD_INPUT,
mbedtls_ccm_auth_decrypt( &ctx, valid_len,
valid_buffer, valid_len,
valid_buffer, valid_len,
NULL, valid_buffer,
valid_buffer, valid_len ) );
TEST_INVALID_PARAM_RET(
MBEDTLS_ERR_CCM_BAD_INPUT,
mbedtls_ccm_auth_decrypt( &ctx, valid_len,
valid_buffer, valid_len,
valid_buffer, valid_len,
valid_buffer, NULL,
valid_buffer, valid_len ) );
TEST_INVALID_PARAM_RET(
MBEDTLS_ERR_CCM_BAD_INPUT,
mbedtls_ccm_auth_decrypt( &ctx, valid_len,
valid_buffer, valid_len,
valid_buffer, valid_len,
valid_buffer, valid_buffer,
NULL, valid_len ) );
/* mbedtls_ccm_star_auth_decrypt() */
TEST_INVALID_PARAM_RET(
MBEDTLS_ERR_CCM_BAD_INPUT,
mbedtls_ccm_star_auth_decrypt( NULL, valid_len,
valid_buffer, valid_len,
valid_buffer, valid_len,
valid_buffer, valid_buffer,
valid_buffer, valid_len ) );
TEST_INVALID_PARAM_RET(
MBEDTLS_ERR_CCM_BAD_INPUT,
mbedtls_ccm_star_auth_decrypt( &ctx, valid_len,
NULL, valid_len,
valid_buffer, valid_len,
valid_buffer, valid_buffer,
valid_buffer, valid_len ) );
TEST_INVALID_PARAM_RET(
MBEDTLS_ERR_CCM_BAD_INPUT,
mbedtls_ccm_star_auth_decrypt( &ctx, valid_len,
valid_buffer, valid_len,
NULL, valid_len,
valid_buffer, valid_buffer,
valid_buffer, valid_len ) );
TEST_INVALID_PARAM_RET(
MBEDTLS_ERR_CCM_BAD_INPUT,
mbedtls_ccm_star_auth_decrypt( &ctx, valid_len,
valid_buffer, valid_len,
valid_buffer, valid_len,
NULL, valid_buffer,
valid_buffer, valid_len ) );
TEST_INVALID_PARAM_RET(
MBEDTLS_ERR_CCM_BAD_INPUT,
mbedtls_ccm_star_auth_decrypt( &ctx, valid_len,
valid_buffer, valid_len,
valid_buffer, valid_len,
valid_buffer, NULL,
valid_buffer, valid_len ) );
TEST_INVALID_PARAM_RET(
MBEDTLS_ERR_CCM_BAD_INPUT,
mbedtls_ccm_star_auth_decrypt( &ctx, valid_len,
valid_buffer, valid_len,
valid_buffer, valid_len,
valid_buffer, valid_buffer,
NULL, valid_len ) );
exit:
mbedtls_ccm_free( &ctx );
return;
}
/* END_CASE */
/* BEGIN_CASE */
void ccm_valid_param( )
{
TEST_VALID_PARAM( mbedtls_ccm_free( NULL ) );
exit:
return;
}
/* END_CASE */
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