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Check whether CRT is revoked by passing its serial number only

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CRLs reference revoked CRTs through their serial number only.
This commit is contained in:
Hanno Becker 2019-02-22 15:01:03 +00:00
parent b3def1d341
commit c84fd1cd95
1 changed files with 21 additions and 6 deletions
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27
library/x509_crt.c
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@ -1740,14 +1740,16 @@ int mbedtls_x509_crt_check_extended_key_usage( const mbedtls_x509_crt *crt,
/*
* Return 1 if the certificate is revoked, or 0 otherwise.
*/
int mbedtls_x509_crt_is_revoked( const mbedtls_x509_crt *crt, const mbedtls_x509_crl *crl )
static int x509_serial_is_revoked( unsigned char const *serial,
size_t serial_len,
const mbedtls_x509_crl *crl )
{
const mbedtls_x509_crl_entry *cur = &crl->entry;
while( cur != NULL && cur->serial.len != 0 )
{
if( crt->serial.len == cur->serial.len &&
memcmp( crt->serial.p, cur->serial.p, crt->serial.len ) == 0 )
if( serial_len == cur->serial.len &&
memcmp( serial, cur->serial.p, serial_len ) == 0 )
{
if( mbedtls_x509_time_is_past( &cur->revocation_date ) )
return( 1 );
@ -1759,11 +1761,21 @@ int mbedtls_x509_crt_is_revoked( const mbedtls_x509_crt *crt, const mbedtls_x509
return( 0 );
}
int mbedtls_x509_crt_is_revoked( const mbedtls_x509_crt *crt,
const mbedtls_x509_crl *crl )
{
return( x509_serial_is_revoked( crt->serial.p,
crt->serial.len,
crl ) );
}
/*
* Check that the given certificate is not revoked according to the CRL.
* Skip validation if no CRL for the given CA is present.
*/
static int x509_crt_verifycrl( mbedtls_x509_crt *crt, mbedtls_x509_crt *ca,
static int x509_crt_verifycrl( unsigned char *crt_serial,
size_t crt_serial_len,
mbedtls_x509_crt *ca,
mbedtls_x509_crl *crl_list,
const mbedtls_x509_crt_profile *profile )
{
@ -1837,7 +1849,8 @@ static int x509_crt_verifycrl( mbedtls_x509_crt *crt, mbedtls_x509_crt *ca,
/*
* Check if certificate is revoked
*/
if( mbedtls_x509_crt_is_revoked( crt, crl_list ) )
if( x509_serial_is_revoked( crt_serial, crt_serial_len,
crl_list ) )
{
flags |= MBEDTLS_X509_BADCERT_REVOKED;
break;
@ -2365,7 +2378,9 @@ find_parent:
#if defined(MBEDTLS_X509_CRL_PARSE_C)
/* Check trusted CA's CRL for the given crt */
*flags |= x509_crt_verifycrl( child, parent, ca_crl, profile );
*flags |= x509_crt_verifycrl( child->serial.p,
child->serial.len,
parent, ca_crl, profile );
#else
(void) ca_crl;
#endif