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Merge pull request #3419 from ndilieto/development

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Pass "certificate policies" extension to callback
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Gilles Peskine 2020-06-23 09:35:45 +02:00 committed by GitHub
commit dda104558b
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5 changed files with 120 additions and 9 deletions
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4
ChangeLog.d/pass-unsupported-policies-to-callback.txt Normal file
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@ -0,0 +1,4 @@
Features
* Pass the "certificate policies" extension to the callback supplied to
mbedtls_x509_crt_parse_der_with_ext_cb() if it contains unsupported
policies (#3419).

12
include/mbedtls/x509_crt.h
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@ -308,7 +308,11 @@ int mbedtls_x509_crt_parse_der( mbedtls_x509_crt *chain,
*
* Callbacks of this type are passed to and used by the
* mbedtls_x509_crt_parse_der_with_ext_cb() routine when
* it encounters an unsupported extension.
* it encounters either an unsupported extension or a
* "certificate policies" extension containing any
* unsupported certificate policies.
* Future versions of the library may invoke the callback
* in other cases, if and when the need arises.
*
* \param p_ctx An opaque context passed to the callback.
* \param crt The certificate being parsed.
@ -360,7 +364,9 @@ typedef int (*mbedtls_x509_crt_ext_cb_t)( void *p_ctx,
* mbedtls_x509_crt_parse_der(), and/or
* mbedtls_x509_crt_parse_der_nocopy()
* but it calls the callback with every unsupported
* certificate extension.
* certificate extension and additionally the
* "certificate policies" extension if it contains any
* unsupported certificate policies.
* The callback must return a negative error code if it
* does not know how to handle such an extension.
* When the callback fails to parse a critical extension
@ -368,6 +374,8 @@ typedef int (*mbedtls_x509_crt_ext_cb_t)( void *p_ctx,
* When the callback fails to parse a non critical extension
* mbedtls_x509_crt_parse_der_with_ext_cb() simply skips
* the extension and continues parsing.
* Future versions of the library may invoke the callback
* in other cases, if and when the need arises.
*
* \return \c 0 if successful.
* \return A negative error code on failure.

10
library/x509_crt.c
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@ -894,7 +894,7 @@ static int x509_get_crt_ext( unsigned char **p,
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
size_t len;
unsigned char *end_ext_data, *end_ext_octet;
unsigned char *end_ext_data, *start_ext_octet, *end_ext_octet;
if( *p == end )
return( 0 );
@ -940,6 +940,7 @@ static int x509_get_crt_ext( unsigned char **p,
MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
start_ext_octet = *p;
end_ext_octet = *p + len;
if( end_ext_octet != end_ext_data )
@ -1025,6 +1026,13 @@ static int x509_get_crt_ext( unsigned char **p,
if( ( ret = x509_get_certificate_policies( p, end_ext_octet,
&crt->certificate_policies ) ) != 0 )
{
/* Give the callback (if any) a chance to handle the extension
* if it contains unsupported policies */
if( ret == MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE && cb != NULL &&
cb( p_ctx, crt, &extn_oid, is_critical,
start_ext_octet, end_ext_octet ) == 0 )
break;
#if !defined(MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION)
if( is_critical )
return( ret );

16
tests/suites/test_suite_x509parse.data
View File

@ -2032,6 +2032,22 @@ X509 CRT ASN1 (Unsupported non critical extension not recognized by callback)
depends_on:MBEDTLS_RSA_C:MBEDTLS_SHA256_C
x509parse_crt_cb:"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":"cert. version \: 3\nserial number \: 4D\:3E\:BB\:B8\:A8\:70\:F9\:C7\:8C\:55\:A8\:A7\:E1\:2F\:D5\:16\nissuer name \: CN=dummy\nsubject name \: CN=dummy\nissued on \: 2020-04-28 17\:42\:43\nexpires on \: 2020-06-27 17\:42\:43\nsigned using \: RSA with SHA-256\nRSA key size \: 2048 bits\nbasic constraints \: CA=true\nsubject alt name \:\n dNSName \: dummy\nkey usage \: Digital Signature, Key Cert Sign\n":0
X509 CRT ASN1 (Unsupported critical policy recognized by callback)
depends_on:MBEDTLS_RSA_C:MBEDTLS_SHA256_C
x509parse_crt_cb:"3081b130819ba0030201028204deadbeef300d06092a864886f70d01010b0500300c310a30080600130454657374301c170c303930313031303030303030170c303931323331323335393539300c310a30080600130454657374302a300d06092a864886f70d010101050003190030160210ffffffffffffffffffffffffffffffff0202ffffa100a200a315301330110603551d20010101040730053003060101300d06092a864886f70d01010b0500030200ff":"cert. version \: 3\nserial number \: DE\:AD\:BE\:EF\nissuer name \: ??=Test\nsubject name \: ??=Test\nissued on \: 2009-01-01 00\:00\:00\nexpires on \: 2009-12-31 23\:59\:59\nsigned using \: RSA with SHA-256\nRSA key size \: 128 bits\ncertificate policies \: ???\n":0
X509 CRT ASN1 (Unsupported critical policy not recognized by callback)
depends_on:MBEDTLS_RSA_C:MBEDTLS_SHA256_C
x509parse_crt_cb:"3081b130819ba0030201028204deadbeef300d06092a864886f70d01010b0500300c310a30080600130454657374301c170c303930313031303030303030170c303931323331323335393539300c310a30080600130454657374302a300d06092a864886f70d010101050003190030160210ffffffffffffffffffffffffffffffff0202ffffa100a200a315301330110603551d20010101040730053003060100300d06092a864886f70d01010b0500030200ff":"":MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE
X509 CRT ASN1 (Unsupported non critical policy recognized by callback)
depends_on:MBEDTLS_RSA_C:MBEDTLS_SHA256_C
x509parse_crt_cb:"3081b130819ba0030201028204deadbeef300d06092a864886f70d01010b0500300c310a30080600130454657374301c170c303930313031303030303030170c303931323331323335393539300c310a30080600130454657374302a300d06092a864886f70d010101050003190030160210ffffffffffffffffffffffffffffffff0202ffffa100a200a315301330110603551d20010100040730053003060101300d06092a864886f70d01010b0500030200ff":"cert. version \: 3\nserial number \: DE\:AD\:BE\:EF\nissuer name \: ??=Test\nsubject name \: ??=Test\nissued on \: 2009-01-01 00\:00\:00\nexpires on \: 2009-12-31 23\:59\:59\nsigned using \: RSA with SHA-256\nRSA key size \: 128 bits\ncertificate policies \: ???\n":0
X509 CRT ASN1 (Unsupported non critical policy not recognized by callback)
depends_on:MBEDTLS_RSA_C:MBEDTLS_SHA256_C
x509parse_crt_cb:"3081b130819ba0030201028204deadbeef300d06092a864886f70d01010b0500300c310a30080600130454657374301c170c303930313031303030303030170c303931323331323335393539300c310a30080600130454657374302a300d06092a864886f70d010101050003190030160210ffffffffffffffffffffffffffffffff0202ffffa100a200a315301330110603551d20010100040730053003060100300d06092a864886f70d01010b0500030200ff":"cert. version \: 3\nserial number \: DE\:AD\:BE\:EF\nissuer name \: ??=Test\nsubject name \: ??=Test\nissued on \: 2009-01-01 00\:00\:00\nexpires on \: 2009-12-31 23\:59\:59\nsigned using \: RSA with SHA-256\nRSA key size \: 128 bits\ncertificate policies \: ???\n":0
X509 CRL ASN1 (Incorrect first tag)
x509parse_crl:"":"":MBEDTLS_ERR_X509_INVALID_FORMAT

87
tests/suites/test_suite_x509parse.function
View File

@ -303,17 +303,92 @@ int verify_parse_san( mbedtls_x509_subject_alternative_name *san,
}
int parse_crt_ext_cb( void *p_ctx, mbedtls_x509_crt const *crt, mbedtls_x509_buf const *oid,
int critical, const unsigned char *p, const unsigned char *end )
int critical, const unsigned char *cp, const unsigned char *end )
{
( void ) crt;
( void ) p;
( void ) end;
( void ) critical;
mbedtls_x509_buf *new_oid = (mbedtls_x509_buf *)p_ctx;
if( new_oid == NULL || new_oid->tag != oid->tag || new_oid->len != oid->len ||
memcmp(new_oid->p, oid->p, oid->len) != 0 )
return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
if( oid->tag == MBEDTLS_ASN1_OID &&
MBEDTLS_OID_CMP( MBEDTLS_OID_CERTIFICATE_POLICIES, oid ) == 0 )
{
/* Handle unknown certificate policy */
int ret, parse_ret = 0;
size_t len;
unsigned char **p = (unsigned char **)&cp;
/* Get main sequence tag */
ret = mbedtls_asn1_get_tag( p, end, &len,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE );
if( ret != 0 )
return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
if( *p + len != end )
return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
/*
* Cannot be an empty sequence.
*/
if( len == 0 )
return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
while( *p < end )
{
const unsigned char *policy_end;
/*
* Get the policy sequence
*/
if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
policy_end = *p + len;
if( ( ret = mbedtls_asn1_get_tag( p, policy_end, &len,
MBEDTLS_ASN1_OID ) ) != 0 )
return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
/*
* Recognize exclusively the policy with OID 1
*/
if( len != 1 || *p[0] != 1 )
parse_ret = MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE;
*p += len;
/*
* If there is an optional qualifier, then *p < policy_end
* Check the Qualifier len to verify it doesn't exceed policy_end.
*/
if( *p < policy_end )
{
if( ( ret = mbedtls_asn1_get_tag( p, policy_end, &len,
MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
/*
* Skip the optional policy qualifiers.
*/
*p += len;
}
if( *p != policy_end )
return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
}
if( *p != end )
return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
return( parse_ret );
}
else if( new_oid != NULL && new_oid->tag == oid->tag && new_oid->len == oid->len &&
memcmp( new_oid->p, oid->p, oid->len ) == 0 )
return( 0 );
else
return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
}
#endif /* MBEDTLS_X509_CRT_PARSE_C */
/* END_HEADER */