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psa: Disallow use of invalid MAC contexts

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Ensure that when doing MAC operations out of order, PSA_ERROR_BAD_STATE
is returned as documented in crypto.h and the PSA Crypto specification.
This commit is contained in:
Jaeden Amero 2019-02-15 14:05:35 +00:00
parent b281f74284
commit 252ef28dac
3 changed files with 143 additions and 0 deletions
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10
library/psa_crypto.c
View file

@ -2238,6 +2238,11 @@ psa_status_t psa_mac_sign_finish( psa_mac_operation_t *operation,
{
psa_status_t status;
if( operation->alg == 0 )
{
return( PSA_ERROR_BAD_STATE );
}
/* Fill the output buffer with something that isn't a valid mac
* (barring an attack on the mac and deliberately-crafted input),
* in case the caller doesn't check the return status properly. */
@ -2276,6 +2281,11 @@ psa_status_t psa_mac_verify_finish( psa_mac_operation_t *operation,
uint8_t actual_mac[PSA_MAC_MAX_SIZE];
psa_status_t status;
if( operation->alg == 0 )
{
return( PSA_ERROR_BAD_STATE );
}
if( operation->is_sign )
{
status = PSA_ERROR_BAD_STATE;

4
tests/suites/test_suite_psa_crypto.data
View file

@ -705,6 +705,10 @@ depends_on:MBEDTLS_CMAC_C
# Either INVALID_ARGUMENT or NOT_SUPPORTED would be reasonable here
mac_setup:PSA_KEY_TYPE_HMAC:"000102030405060708090a0b0c0d0e0f":PSA_ALG_CMAC:PSA_ERROR_NOT_SUPPORTED
PSA MAC: bad order function calls
depends_on:MBEDTLS_MD_C:MBEDTLS_SHA256_C
mac_bad_order:
PSA MAC sign: RFC4231 Test case 1 - HMAC-SHA-224
depends_on:MBEDTLS_MD_C:MBEDTLS_SHA256_C
mac_sign:PSA_KEY_TYPE_HMAC:"0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b0b":PSA_ALG_HMAC(PSA_ALG_SHA_224):"4869205468657265":"896fb1128abbdf196832107cd49df33f47b4b1169912ba4f53684b22"

129
tests/suites/test_suite_psa_crypto.function
View file

@ -2168,6 +2168,8 @@ exit:
/* BEGIN_CASE */
void mac_operation_init( )
{
const uint8_t input[1] = { 0 };
/* Test each valid way of initializing the object, except for `= {0}`, as
* Clang 5 complains when `-Wmissing-field-initializers` is used, even
* though it's OK by the C standard. We could test for this, but we'd need
@ -2178,6 +2180,17 @@ void mac_operation_init( )
memset( &zero, 0, sizeof( zero ) );
/* A freshly-initialized MAC operation should not be usable. */
TEST_EQUAL( psa_mac_update( &func,
input, sizeof( input ) ),
PSA_ERROR_BAD_STATE );
TEST_EQUAL( psa_mac_update( &init,
input, sizeof( input ) ),
PSA_ERROR_BAD_STATE );
TEST_EQUAL( psa_mac_update( &zero,
input, sizeof( input ) ),
PSA_ERROR_BAD_STATE );
/* A default MAC operation should be abortable without error. */
PSA_ASSERT( psa_mac_abort( &func ) );
PSA_ASSERT( psa_mac_abort( &init ) );
@ -2220,6 +2233,122 @@ exit:
}
/* END_CASE */
/* BEGIN_CASE */
void mac_bad_order( )
{
psa_key_handle_t handle = 0;
psa_key_type_t key_type = PSA_KEY_TYPE_HMAC;
psa_algorithm_t alg = PSA_ALG_HMAC(PSA_ALG_SHA_256);
const uint8_t key[] = {
0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa,
0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa, 0xaa };
psa_key_policy_t policy = PSA_KEY_POLICY_INIT;
psa_mac_operation_t operation = PSA_MAC_OPERATION_INIT;
uint8_t sign_mac[PSA_MAC_MAX_SIZE + 10] = { 0 };
size_t sign_mac_length = 0;
const uint8_t input[] = { 0xbb, 0xbb, 0xbb, 0xbb };
const uint8_t verify_mac[] = {
0x74, 0x65, 0x93, 0x8c, 0xeb, 0x1d, 0xb3, 0x76, 0x5a, 0x38, 0xe7, 0xdd,
0x85, 0xc5, 0xad, 0x4f, 0x07, 0xe7, 0xd5, 0xb2, 0x64, 0xf0, 0x1a, 0x1a,
0x2c, 0xf9, 0x18, 0xca, 0x59, 0x7e, 0x5d, 0xf6 };
PSA_ASSERT( psa_crypto_init( ) );
PSA_ASSERT( psa_allocate_key( &handle ) );
psa_key_policy_set_usage( &policy,
PSA_KEY_USAGE_SIGN | PSA_KEY_USAGE_VERIFY,
alg );
PSA_ASSERT( psa_set_key_policy( handle, &policy ) );
PSA_ASSERT( psa_import_key( handle, key_type,
key, sizeof(key) ) );
/* Call update without calling setup beforehand. */
TEST_EQUAL( psa_mac_update( &operation, input, sizeof( input ) ),
PSA_ERROR_BAD_STATE );
PSA_ASSERT( psa_mac_abort( &operation ) );
/* Call sign finish without calling setup beforehand. */
TEST_EQUAL( psa_mac_sign_finish( &operation, sign_mac, sizeof( sign_mac ),
&sign_mac_length),
PSA_ERROR_BAD_STATE );
PSA_ASSERT( psa_mac_abort( &operation ) );
/* Call verify finish without calling setup beforehand. */
TEST_EQUAL( psa_mac_verify_finish( &operation,
verify_mac, sizeof( verify_mac ) ),
PSA_ERROR_BAD_STATE );
PSA_ASSERT( psa_mac_abort( &operation ) );
/* Call update after sign finish. */
PSA_ASSERT( psa_mac_sign_setup( &operation,
handle, alg ) );
PSA_ASSERT( psa_mac_update( &operation, input, sizeof( input ) ) );
PSA_ASSERT( psa_mac_sign_finish( &operation,
sign_mac, sizeof( sign_mac ),
&sign_mac_length ) );
TEST_EQUAL( psa_mac_update( &operation, input, sizeof( input ) ),
PSA_ERROR_BAD_STATE );
PSA_ASSERT( psa_mac_abort( &operation ) );
/* Call update after verify finish. */
PSA_ASSERT( psa_mac_verify_setup( &operation,
handle, alg ) );
PSA_ASSERT( psa_mac_update( &operation, input, sizeof( input ) ) );
PSA_ASSERT( psa_mac_verify_finish( &operation,
verify_mac, sizeof( verify_mac ) ) );
TEST_EQUAL( psa_mac_update( &operation, input, sizeof( input ) ),
PSA_ERROR_BAD_STATE );
PSA_ASSERT( psa_mac_abort( &operation ) );
/* Call sign finish twice in a row. */
PSA_ASSERT( psa_mac_sign_setup( &operation,
handle, alg ) );
PSA_ASSERT( psa_mac_update( &operation, input, sizeof( input ) ) );
PSA_ASSERT( psa_mac_sign_finish( &operation,
sign_mac, sizeof( sign_mac ),
&sign_mac_length ) );
TEST_EQUAL( psa_mac_sign_finish( &operation,
sign_mac, sizeof( sign_mac ),
&sign_mac_length ),
PSA_ERROR_BAD_STATE );
PSA_ASSERT( psa_mac_abort( &operation ) );
/* Call verify finish twice in a row. */
PSA_ASSERT( psa_mac_verify_setup( &operation,
handle, alg ) );
PSA_ASSERT( psa_mac_update( &operation, input, sizeof( input ) ) );
PSA_ASSERT( psa_mac_verify_finish( &operation,
verify_mac, sizeof( verify_mac ) ) );
TEST_EQUAL( psa_mac_verify_finish( &operation,
verify_mac, sizeof( verify_mac ) ),
PSA_ERROR_BAD_STATE );
PSA_ASSERT( psa_mac_abort( &operation ) );
/* Setup sign but try verify. */
PSA_ASSERT( psa_mac_sign_setup( &operation,
handle, alg ) );
PSA_ASSERT( psa_mac_update( &operation, input, sizeof( input ) ) );
TEST_EQUAL( psa_mac_verify_finish( &operation,
verify_mac, sizeof( verify_mac ) ),
PSA_ERROR_BAD_STATE );
PSA_ASSERT( psa_mac_abort( &operation ) );
/* Setup verify but try sign. */
PSA_ASSERT( psa_mac_verify_setup( &operation,
handle, alg ) );
PSA_ASSERT( psa_mac_update( &operation, input, sizeof( input ) ) );
TEST_EQUAL( psa_mac_sign_finish( &operation,
sign_mac, sizeof( sign_mac ),
&sign_mac_length ),
PSA_ERROR_BAD_STATE );
PSA_ASSERT( psa_mac_abort( &operation ) );
exit:
mbedtls_psa_crypto_free( );
}
/* END_CASE */
/* BEGIN_CASE */
void mac_sign( int key_type_arg,
data_t *key,