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Merge pull request #1173 from davidhorstmann-arm/generate-random-buffer-protection-backport

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[Backport 2.28] Add secure buffer copying to `psa_generate_random()`
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David Horstmann 2024-03-04 13:23:50 +00:00 committed by GitHub
commit 126dc1cd52
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3 changed files with 67 additions and 37 deletions
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96
library/psa_crypto.c
View File

@ -3585,6 +3585,52 @@ exit:
return (status == PSA_SUCCESS) ? unlock_status : status;
}
static psa_status_t psa_generate_random_internal(uint8_t *output,
size_t output_size)
{
GUARD_MODULE_INITIALIZED;
psa_status_t status;
#if defined(MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG)
size_t output_length = 0;
status = mbedtls_psa_external_get_random(&global_data.rng,
output, output_size,
&output_length);
if (status != PSA_SUCCESS) {
goto exit;
}
/* Breaking up a request into smaller chunks is currently not supported
* for the external RNG interface. */
if (output_length != output_size) {
status = PSA_ERROR_INSUFFICIENT_ENTROPY;
goto exit;
}
status = PSA_SUCCESS;
#else /* MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */
while (output_size > 0) {
size_t request_size =
(output_size > MBEDTLS_PSA_RANDOM_MAX_REQUEST ?
MBEDTLS_PSA_RANDOM_MAX_REQUEST :
output_size);
int ret = mbedtls_psa_get_random(MBEDTLS_PSA_RANDOM_STATE,
output, request_size);
if (ret != 0) {
status = mbedtls_to_psa_error(ret);
goto exit;
}
output_size -= request_size;
output += request_size;
}
status = PSA_SUCCESS;
#endif /* MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */
exit:
return status;
}
/****************************************************************/
@ -3707,7 +3753,7 @@ psa_status_t psa_cipher_generate_iv(psa_cipher_operation_t *operation,
goto exit;
}
status = psa_generate_random(local_iv, default_iv_length);
status = psa_generate_random_internal(local_iv, default_iv_length);
if (status != PSA_SUCCESS) {
goto exit;
}
@ -3896,7 +3942,7 @@ psa_status_t psa_cipher_encrypt(mbedtls_svc_key_id_t key,
goto exit;
}
status = psa_generate_random(local_iv, default_iv_length);
status = psa_generate_random_internal(local_iv, default_iv_length);
if (status != PSA_SUCCESS) {
goto exit;
}
@ -5424,7 +5470,7 @@ exit:
* some constant data such as zeros, which would result in the data
* being protected with a reproducible, easily knowable key.
*/
psa_generate_random(output, output_size);
psa_generate_random_internal(output, output_size);
*output_length = output_size;
}
@ -5434,7 +5480,6 @@ exit:
}
/****************************************************************/
/* Random generation */
/****************************************************************/
@ -5503,44 +5548,21 @@ static psa_status_t mbedtls_psa_random_seed(mbedtls_psa_random_context_t *rng)
#endif /* MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */
}
psa_status_t psa_generate_random(uint8_t *output,
psa_status_t psa_generate_random(uint8_t *output_external,
size_t output_size)
{
GUARD_MODULE_INITIALIZED;
psa_status_t status;
#if defined(MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG)
LOCAL_OUTPUT_DECLARE(output_external, output);
LOCAL_OUTPUT_ALLOC(output_external, output_size, output);
size_t output_length = 0;
psa_status_t status = mbedtls_psa_external_get_random(&global_data.rng,
output, output_size,
&output_length);
if (status != PSA_SUCCESS) {
return status;
}
/* Breaking up a request into smaller chunks is currently not supported
* for the external RNG interface. */
if (output_length != output_size) {
return PSA_ERROR_INSUFFICIENT_ENTROPY;
}
return PSA_SUCCESS;
status = psa_generate_random_internal(output, output_size);
#else /* MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */
while (output_size > 0) {
size_t request_size =
(output_size > MBEDTLS_PSA_RANDOM_MAX_REQUEST ?
MBEDTLS_PSA_RANDOM_MAX_REQUEST :
output_size);
int ret = mbedtls_psa_get_random(MBEDTLS_PSA_RANDOM_STATE,
output, request_size);
if (ret != 0) {
return mbedtls_to_psa_error(ret);
}
output_size -= request_size;
output += request_size;
}
return PSA_SUCCESS;
#endif /* MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */
#if defined(MBEDTLS_PSA_COPY_CALLER_BUFFERS)
exit:
#endif
LOCAL_OUTPUT_FREE(output_external, output);
return status;
}
/* Wrapper function allowing the classic API to use the PSA RNG.

2
tests/scripts/generate_psa_wrappers.py
View File

@ -173,6 +173,8 @@ class PSAWrapperGenerator(c_wrapper_generator.Base):
'psa_hash_compute',
'psa_hash_compare'):
return True
if function_name == 'psa_generate_random':
return True
if function_name in ('psa_mac_update',
'psa_mac_sign_finish',
'psa_mac_verify_finish',

6
tests/src/psa_test_wrappers.c
View File

@ -346,7 +346,13 @@ psa_status_t mbedtls_test_wrap_psa_generate_random(
uint8_t *arg0_output,
size_t arg1_output_size)
{
#if defined(MBEDTLS_PSA_COPY_CALLER_BUFFERS)
MBEDTLS_TEST_MEMORY_POISON(arg0_output, arg1_output_size);
#endif /* defined(MBEDTLS_PSA_COPY_CALLER_BUFFERS) */
psa_status_t status = (psa_generate_random)(arg0_output, arg1_output_size);
#if defined(MBEDTLS_PSA_COPY_CALLER_BUFFERS)
MBEDTLS_TEST_MEMORY_UNPOISON(arg0_output, arg1_output_size);
#endif /* defined(MBEDTLS_PSA_COPY_CALLER_BUFFERS) */
return status;
}