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Merge pull request #3067 from gilles-peskine-arm/fuzz_pubkey-rsa_export

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Fix fuzz_pubkey on valid RSA keys
This commit is contained in:
Gilles Peskine 2020-03-04 11:23:14 +01:00 committed by GitHub
parent 67d31c4f5b d7fb66fd13
commit 59e584949d
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
2 changed files with 37 additions and 18 deletions
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24
programs/fuzz/fuzz_privkey.c
View file

@ -44,20 +44,26 @@ int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
else
#endif
#if defined(MBEDTLS_ECP_C)
if( mbedtls_pk_get_type( &pk ) == MBEDTLS_PK_ECKEY )
if( mbedtls_pk_get_type( &pk ) == MBEDTLS_PK_ECKEY ||
mbedtls_pk_get_type( &pk ) == MBEDTLS_PK_ECKEY_DH )
{
mbedtls_ecp_keypair *ecp;
mbedtls_ecp_keypair *ecp = mbedtls_pk_ec( pk );
mbedtls_ecp_group_id grp_id = ecp->grp.id;
const mbedtls_ecp_curve_info *curve_info =
mbedtls_ecp_curve_info_from_grp_id( grp_id );
ecp = mbedtls_pk_ec( pk );
if (ecp) {
ret = 0;
}
/* If the curve is not supported, the key should not have been
* accepted. */
if( curve_info == NULL )
abort( );
}
else
#endif
{
ret = 0;
}
{
/* The key is valid but is not of a supported type.
* This should not happen. */
abort( );
}
}
mbedtls_pk_free( &pk );
#else

31
programs/fuzz/fuzz_pubkey.c
View file

@ -21,7 +21,10 @@ int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
mbedtls_mpi_init( &DQ ); mbedtls_mpi_init( &QP );
rsa = mbedtls_pk_rsa( pk );
if ( mbedtls_rsa_export( rsa, &N, &P, &Q, &D, &E ) != 0 ) {
if ( mbedtls_rsa_export( rsa, &N, NULL, NULL, NULL, &E ) != 0 ) {
abort();
}
if ( mbedtls_rsa_export( rsa, &N, &P, &Q, &D, &E ) != MBEDTLS_ERR_RSA_BAD_INPUT_DATA ) {
abort();
}
if ( mbedtls_rsa_export_crt( rsa, &DP, &DQ, &QP ) != MBEDTLS_ERR_RSA_BAD_INPUT_DATA ) {
@ -36,20 +39,30 @@ int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
else
#endif
#if defined(MBEDTLS_ECP_C)
if( mbedtls_pk_get_type( &pk ) == MBEDTLS_PK_ECKEY )
if( mbedtls_pk_get_type( &pk ) == MBEDTLS_PK_ECKEY ||
mbedtls_pk_get_type( &pk ) == MBEDTLS_PK_ECKEY_DH )
{
mbedtls_ecp_keypair *ecp;
mbedtls_ecp_keypair *ecp = mbedtls_pk_ec( pk );
mbedtls_ecp_group_id grp_id = ecp->grp.id;
const mbedtls_ecp_curve_info *curve_info =
mbedtls_ecp_curve_info_from_grp_id( grp_id );
ecp = mbedtls_pk_ec( pk );
//dummy use of value
if (ecp) {
ret = 0;
}
/* If the curve is not supported, the key should not have been
* accepted. */
if( curve_info == NULL )
abort( );
/* It's a public key, so the private value should not have
* been changed from its initialization to 0. */
if( mbedtls_mpi_cmp_int( &ecp->d, 0 ) != 0 )
abort( );
}
else
#endif
{
ret = 0;
/* The key is valid but is not of a supported type.
* This should not happen. */
abort( );
}
}
mbedtls_pk_free( &pk );