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Check that SAN is not malformed when parsing

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Add a call to `mbedtls_x509_parse_subject_alt_name()` during
certificate parsing, to verify the certificate is not malformed.
This commit is contained in:
Ron Eldor 2019-05-15 15:46:03 +03:00
parent c8b5f3f520
commit dbbd96652c
1 changed files with 26 additions and 0 deletions
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26
library/x509_crt.c
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@ -642,6 +642,9 @@ static int x509_get_subject_alt_name( unsigned char **p,
while( *p < end )
{
mbedtls_x509_subject_alternative_name dummy_san_buf;
memset( &dummy_san_buf, 0, sizeof( dummy_san_buf ) );
if( ( end - *p ) < 1 )
return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
MBEDTLS_ERR_ASN1_OUT_OF_DATA );
@ -658,6 +661,29 @@ static int x509_get_subject_alt_name( unsigned char **p,
MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
}
/*
* Check that the SAN are structured correct.
*/
ret = mbedtls_x509_parse_subject_alt_name( &(cur->buf), &dummy_san_buf );
/*
* In case the extension is malformed, return an error,
* and clear the allocated sequences.
*/
if( ret != 0 && ret != MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE )
{
mbedtls_x509_sequence *seq_cur = subject_alt_name->next;
mbedtls_x509_sequence *seq_prv;
while( seq_cur != NULL )
{
seq_prv = seq_cur;
seq_cur = seq_cur->next;
mbedtls_platform_zeroize( seq_prv,
sizeof( mbedtls_x509_sequence ) );
mbedtls_free( seq_prv );
}
return( ret );
}
/* Allocate and assign next pointer */
if( cur->buf.p != NULL )
{