Commit 7afb8a0d authored by Manuel Pégourié-Gonnard's avatar Manuel Pégourié-Gonnard
Browse files

Add x509_crt_check_extended_key_usage()

parent d6ad8e94
......@@ -971,6 +971,19 @@
*/
#define POLARSSL_X509_CHECK_KEY_USAGE
/**
* \def POLARSSL_X509_CHECK_EXTENDED_KEY_USAGE
*
* Enable verification of the extendedKeyUsage extension (leaf certificates).
*
* Disabling this avoids problems with mis-issued and/or misused certificates.
*
* \warning Depending on your PKI use, disabling this can be a security risk!
*
* Comment to skip extendedKeyUsage checking for certificates.
*/
#define POLARSSL_X509_CHECK_EXTENDED_KEY_USAGE
/**
* \def POLARSSL_ZLIB_SUPPORT
*
......
......@@ -264,6 +264,24 @@ int x509_crt_verify( x509_crt *crt,
int x509_crt_check_key_usage( const x509_crt *crt, int usage );
#endif /* POLARSSL_X509_CHECK_KEY_USAGE) */
#if defined(POLARSSL_X509_CHECK_EXTENDED_KEY_USAGE)
/**
* \brief Check usage of certificate against extentedJeyUsage.
*
* \param crt Leaf certificate used.
* \param usage_oid Intended usage (eg OID_SERVER_AUTH or OID_CLIENT_AUTH).
* \param usage_len Length of usage_oid (eg given by OID_SIZE()).
*
* \return 0 is this use of the certificate is allowed,
* POLARSSL_ERR_X509_BAD_INPUT_DATA if not.
*
* \note Usually only makes sense on leaf certificates.
*/
int x509_crt_check_extended_key_usage( const x509_crt *crt,
const char *usage_oid,
size_t usage_len );
#endif /* POLARSSL_X509_CHECK_EXTENDED_KEY_USAGE) */
#if defined(POLARSSL_X509_CRL_PARSE_C)
/**
* \brief Verify the certificate revocation status
......
......@@ -1371,6 +1371,38 @@ int x509_crt_check_key_usage( const x509_crt *crt, int usage )
}
#endif
#if defined(POLARSSL_X509_CHECK_EXTENDED_KEY_USAGE)
int x509_crt_check_extended_key_usage( const x509_crt *crt,
const char *usage_oid,
size_t usage_len )
{
const x509_sequence *cur;
/* Extension is not mandatory, absent means no restriction */
if( ( crt->ext_types & EXT_EXTENDED_KEY_USAGE ) == 0 )
return( 0 );
/*
* Look for the requested usage (or wildcard ANY) in our list
*/
for( cur = &crt->ext_key_usage; cur != NULL; cur = cur->next )
{
const x509_buf *cur_oid = &cur->buf;
if( cur_oid->len == usage_len &&
memcmp( cur_oid->p, usage_oid, usage_len ) == 0 )
{
return( 0 );
}
if( OID_CMP( OID_ANY_EXTENDED_KEY_USAGE, cur_oid ) )
return( 0 );
}
return( POLARSSL_ERR_X509_BAD_INPUT_DATA );
}
#endif
#if defined(POLARSSL_X509_CRL_PARSE_C)
/*
* Return 1 if the certificate is revoked, or 0 otherwise.
......
-----BEGIN CERTIFICATE-----
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owgau88CMQDuI0fsq5tnyiHPaDSAE21/6hlrCR6deNbwzB94OuPIbx1wIas9D1jc
//iSmKtbl8Y=
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
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gaJRvpUCMFS6hYhrht38yqwwhSVlnmTMVtira58mEUhL6v7Qzw1sz/Dm4aXkW3s6
JQV1kqqbRw==
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
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-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
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2x5sX/0OSx4=
-----END CERTIFICATE-----
-----BEGIN CERTIFICATE-----
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SmsT1m9VPQMIyUo/3RtYjg==
-----END CERTIFICATE-----
......@@ -871,3 +871,24 @@ x509_check_key_usage:"data_files/server1.key_usage.crt":KU_KEY_CERT_SIGN|KU_CRL_
X509 crt keyUsage #8 (extension present, combined KU one absent)
x509_check_key_usage:"data_files/server1.key_usage.crt":KU_KEY_ENCIPHERMENT|KU_KEY_AGREEMENT:POLARSSL_ERR_X509_BAD_INPUT_DATA
X509 crt extendedKeyUsage #1 (no extension, serverAuth)
x509_check_extended_key_usage:"data_files/server5.crt":"2B06010505070301":0
X509 crt extendedKeyUsage #2 (single value, present)
x509_check_extended_key_usage:"data_files/server5.eku-srv.crt":"2B06010505070301":0
X509 crt extendedKeyUsage #3 (single value, absent)
x509_check_extended_key_usage:"data_files/server5.eku-cli.crt":"2B06010505070301":POLARSSL_ERR_X509_BAD_INPUT_DATA
X509 crt extendedKeyUsage #4 (two values, first)
x509_check_extended_key_usage:"data_files/server5.eku-srv_cli.crt":"2B06010505070301":0
X509 crt extendedKeyUsage #5 (two values, second)
x509_check_extended_key_usage:"data_files/server5.eku-srv_cli.crt":"2B06010505070302":0
X509 crt extendedKeyUsage #6 (two values, other)
x509_check_extended_key_usage:"data_files/server5.eku-srv_cli.crt":"2B06010505070303":POLARSSL_ERR_X509_BAD_INPUT_DATA
X509 crt extendedKeyUsage #7 (any, random)
x509_check_extended_key_usage:"data_files/server5.eku-cs_any.crt":"2B060105050703FF":0
......@@ -331,6 +331,25 @@ void x509_check_key_usage( char *crt_file, int usage, int ret )
}
/* END_CASE */
/* BEGIN_CASE depends_on:POLARSSL_X509_CRT_PARSE_C:POLARSSL_X509_CHECK_EXTENDED_KEY_USAGE */
void x509_check_extended_key_usage( char *crt_file, char *usage_hex, int ret )
{
x509_crt crt;
char oid[50];
size_t len;
x509_crt_init( &crt );
len = unhexify( (unsigned char *) oid, usage_hex );
TEST_ASSERT( x509_crt_parse_file( &crt, crt_file ) == 0 );
TEST_ASSERT( x509_crt_check_extended_key_usage( &crt, oid, len ) == ret );
x509_crt_free( &crt );
}
/* END_CASE */
/* BEGIN_CASE depends_on:POLARSSL_X509_CRT_PARSE_C:POLARSSL_SELF_TEST */
void x509_selftest()
{
......
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