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psa: free RNG implementation before checking for remaining open key slots

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Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
This commit is contained in:
Valerio Setti 2023-11-13 10:24:32 +01:00
parent 5f4b28defc
commit 402cfba4dc
3 changed files with 29 additions and 15 deletions
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9
include/psa/crypto_extra.h
View file

@ -193,6 +193,15 @@ psa_status_t mbedtls_psa_register_se_key(
/**@}*/
/**
* \brief PSA random deinitialization.
*
* This function frees the RNG implementation used by PSA.
*
* This is an Mbed TLS extension.
*/
void mbedtls_psa_random_free(void);
/**
* \brief Library deinitialization.
*

22
library/psa_crypto.c
View file

@ -7327,14 +7327,16 @@ static void mbedtls_psa_random_init(mbedtls_psa_random_context_t *rng)
/** Deinitialize the PSA random generator.
*/
static void mbedtls_psa_random_free(mbedtls_psa_random_context_t *rng)
void mbedtls_psa_random_free(void)
{
if (global_data.rng_state != RNG_NOT_INITIALIZED) {
#if defined(MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG)
memset(rng, 0, sizeof(*rng));
memset(&global_data.rng, 0, sizeof(global_data.rng));
#else /* MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */
mbedtls_psa_drbg_free(MBEDTLS_PSA_RANDOM_STATE);
rng->entropy_free(&rng->entropy);
global_data.rng.entropy_free(&global_data.rng.entropy);
#endif /* MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG */
}
}
/** Seed the PSA random generator.
@ -7661,9 +7663,7 @@ psa_status_t mbedtls_psa_crypto_configure_entropy_sources(
void mbedtls_psa_crypto_free(void)
{
psa_wipe_all_key_slots();
if (global_data.rng_state != RNG_NOT_INITIALIZED) {
mbedtls_psa_random_free(&global_data.rng);
}
mbedtls_psa_random_free();
/* Wipe all remaining data, including configuration.
* In particular, this sets all state indicator to the value
* indicating "uninitialized". */
@ -7714,6 +7714,11 @@ psa_status_t psa_crypto_init(void)
}
global_data.drivers_initialized = 1;
status = psa_initialize_key_slots();
if (status != PSA_SUCCESS) {
goto exit;
}
/* Initialize and seed the random generator. */
mbedtls_psa_random_init(&global_data.rng);
global_data.rng_state = RNG_INITIALIZED;
@ -7723,11 +7728,6 @@ psa_status_t psa_crypto_init(void)
}
global_data.rng_state = RNG_SEEDED;
status = psa_initialize_key_slots();
if (status != PSA_SUCCESS) {
goto exit;
}
#if defined(PSA_CRYPTO_STORAGE_HAS_TRANSACTIONS)
status = psa_crypto_load_transaction();
if (status == PSA_SUCCESS) {

5
tests/include/test/psa_crypto_helpers.h
View file

@ -34,6 +34,7 @@
#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(); \
@ -125,6 +126,9 @@ 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.
@ -132,6 +136,7 @@ const char *mbedtls_test_helper_is_psa_leaking(void);
#define PSA_SESSION_DONE() \
do \
{ \
mbedtls_psa_random_free(); \
mbedtls_test_psa_purge_key_cache(); \
ASSERT_PSA_PRISTINE(); \
mbedtls_psa_crypto_free(); \