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test_suite_psa_crypto_slot_management: modify check on open key slots

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- Reverts changes previously done to psa_crypto_helpers.[c,h]
- Implements a new check for open key slots in
  mbedtls_test_helper_is_psa_leaking():
   - when CTR_DRBG does not use AES_C or PSA does not have an external
     RNG, then we allow 1 key slot (it's the one holding the AES key)
   - when the above conditions are not met, then we fallback to the
     usual check for "no open key slots remaining"

Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
This commit is contained in:
Valerio Setti 2023-11-24 08:36:12 +01:00
parent 7ab90723c4
commit 7448367f68
3 changed files with 17 additions and 11 deletions
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11
tests/include/test/psa_crypto_helpers.h
View File

@ -34,7 +34,6 @@
#define PSA_DONE() \
do \
{ \
mbedtls_psa_random_free(); \
mbedtls_test_fail_if_psa_leaking(__LINE__, __FILE__); \
mbedtls_test_psa_purge_key_storage(); \
mbedtls_psa_crypto_free(); \
@ -126,21 +125,17 @@ const char *mbedtls_test_helper_is_psa_leaking(void);
/** Shut down the PSA Crypto subsystem, allowing persistent keys to survive.
* Expect a clean shutdown, with no slots in use.
* mbedtls_psa_random_free() is called before any check for remaining open
* keys because when AES_C is not defined, CTR_DRBG relies on PSA to perform
* AES-ECB so it holds an open AES key for that since psa_crypto_init().
*
* If some key slots are still in use, record the test case as failed and
* jump to the `exit` label.
*/
#define PSA_SESSION_DONE() \
do \
{ \
mbedtls_psa_random_free(); \
do \
{ \
mbedtls_test_psa_purge_key_cache(); \
ASSERT_PSA_PRISTINE(); \
mbedtls_psa_crypto_free(); \
} \
} \
while (0)

11
tests/src/psa_crypto_helpers.c
View File

@ -70,9 +70,20 @@ const char *mbedtls_test_helper_is_psa_leaking(void)
mbedtls_psa_get_stats(&stats);
#if defined(MBEDTLS_CTR_DRBG_C) && !defined(MBEDTLS_AES_C) && \
!defined(MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG)
/* When AES_C is not defined and PSA does not have an external RNG,
* then CTR_DRBG uses PSA to perform AES-ECB. In this scenario 1 key
* slot is used internally from PSA to hold the AES key and it should
* not be taken into account when evaluating remaining open slots. */
if (stats.volatile_slots > 1) {
return "A volatile slot has not been closed properly.";
}
#else
if (stats.volatile_slots != 0) {
return "A volatile slot has not been closed properly.";
}
#endif
if (stats.persistent_slots != 0) {
return "A persistent slot has not been closed properly.";
}

6
tests/suites/test_suite_psa_crypto_slot_management.function
View File

@ -90,10 +90,10 @@ static int invalidate_psa(invalidate_method_t invalidate_method)
break;
}
/* When AES_C is not defined CTR_DRBG relies on PSA to get AES-ECB so it
* holds an open key once psa_crypto_init() is called. */
ASSERT_PSA_PRISTINE();
PSA_ASSERT(psa_crypto_init());
ASSERT_PSA_PRISTINE();
return 1;
exit: