mirror of
https://github.com/yuzu-emu/mbedtls.git
synced 2024-12-23 22:55:32 +00:00
Implement v3 Extension parsing through ASN.1 SEQUENCE OF traversal
This commit rewrites the v3 ext parsing routine `x509_crt_get_ext_cb()` in terms of the generic ASN.1 SEQUENCE traversal routine.
This commit is contained in:
Hanno Becker
parent
c7c638eddd
commit
f1b39bf18c
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@ -393,7 +393,7 @@ static int x509_get_basic_constraints( unsigned char **p,
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if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
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MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
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return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
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return( ret );
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if( *p == end )
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return( 0 );
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@ -404,7 +404,7 @@ static int x509_get_basic_constraints( unsigned char **p,
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ret = mbedtls_asn1_get_int( p, end, ca_istrue );
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if( ret != 0 )
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return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
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return( ret );
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if( *ca_istrue != 0 )
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*ca_istrue = 1;
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@ -414,11 +414,10 @@ static int x509_get_basic_constraints( unsigned char **p,
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return( 0 );
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if( ( ret = mbedtls_asn1_get_int( p, end, max_pathlen ) ) != 0 )
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return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
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return( ret );
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if( *p != end )
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return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
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MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
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return( MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
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(*max_pathlen)++;
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@ -433,11 +432,10 @@ static int x509_get_ns_cert_type( unsigned char **p,
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mbedtls_x509_bitstring bs = { 0, 0, NULL };
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if( ( ret = mbedtls_asn1_get_bitstring( p, end, &bs ) ) != 0 )
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return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
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return( ret );
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if( bs.len != 1 )
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return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
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MBEDTLS_ERR_ASN1_INVALID_LENGTH );
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return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
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/* Get actual bitstring */
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*ns_cert_type = *bs.p;
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@ -453,11 +451,10 @@ static int x509_get_key_usage( unsigned char **p,
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mbedtls_x509_bitstring bs = { 0, 0, NULL };
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if( ( ret = mbedtls_asn1_get_bitstring( p, end, &bs ) ) != 0 )
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return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
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return( ret );
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if( bs.len < 1 )
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return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
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MBEDTLS_ERR_ASN1_INVALID_LENGTH );
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return( MBEDTLS_ERR_ASN1_INVALID_LENGTH );
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/* Get actual bitstring */
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*key_usage = 0;
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@ -478,17 +475,8 @@ static int x509_get_ext_key_usage( unsigned char **p,
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const unsigned char *end,
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mbedtls_x509_sequence *ext_key_usage)
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{
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int ret;
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if( ( ret = mbedtls_asn1_get_sequence_of( p, end, ext_key_usage, MBEDTLS_ASN1_OID ) ) != 0 )
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return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
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/* Sequence length must be >= 1 */
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if( ext_key_usage->buf.p == NULL )
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return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
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MBEDTLS_ERR_ASN1_INVALID_LENGTH );
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return( 0 );
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return( mbedtls_asn1_get_sequence_of( p, end, ext_key_usage,
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MBEDTLS_ASN1_OID ) );
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}
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/*
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@ -546,162 +534,202 @@ static int x509_get_subject_alt_name( unsigned char *p,
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const unsigned char *end,
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mbedtls_x509_sequence *subject_alt_name )
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{
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int ret;
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ret = mbedtls_asn1_traverse_sequence_of( &p, end,
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MBEDTLS_ASN1_TAG_CLASS_MASK,
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MBEDTLS_ASN1_CONTEXT_SPECIFIC,
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MBEDTLS_ASN1_TAG_VALUE_MASK,
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2 /* SubjectAlt DNS */,
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x509_get_subject_alt_name_cb,
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(void*) &subject_alt_name );
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if( ret != 0 )
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ret += MBEDTLS_ERR_X509_INVALID_EXTENSIONS;
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return( ret );
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return( mbedtls_asn1_traverse_sequence_of( &p, end,
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MBEDTLS_ASN1_TAG_CLASS_MASK,
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MBEDTLS_ASN1_CONTEXT_SPECIFIC,
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MBEDTLS_ASN1_TAG_VALUE_MASK,
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2 /* SubjectAlt DNS */,
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x509_get_subject_alt_name_cb,
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(void*) &subject_alt_name ) );
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}
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/*
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* X.509 v3 extensions
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*
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*/
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static int x509_get_crt_ext( unsigned char **p,
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const unsigned char *end,
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mbedtls_x509_crt *crt )
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static int x509_crt_get_ext_cb( void *ctx,
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int tag,
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unsigned char *p,
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size_t ext_len )
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{
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int ret;
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mbedtls_x509_crt *crt = (mbedtls_x509_crt *) ctx;
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size_t len;
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unsigned char *end_ext_data, *end_ext_octet;
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unsigned char *end, *end_ext_octet;
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mbedtls_x509_buf extn_oid = { 0, 0, NULL };
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int is_critical = 0; /* DEFAULT FALSE */
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int ext_type = 0;
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if( *p == end )
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return( 0 );
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((void) tag);
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if( ( ret = mbedtls_x509_get_ext( p, end, &crt->v3_ext, 3 ) ) != 0 )
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return( ret );
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/*
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* Extension ::= SEQUENCE {
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* extnID OBJECT IDENTIFIER,
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* critical BOOLEAN DEFAULT FALSE,
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* extnValue OCTET STRING }
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*/
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end = crt->v3_ext.p + crt->v3_ext.len;
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while( *p < end )
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end = p + ext_len;
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/* Get extension ID */
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if( ( ret = mbedtls_asn1_get_tag( &p, end, &extn_oid.len,
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MBEDTLS_ASN1_OID ) ) != 0 )
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goto err;
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extn_oid.tag = MBEDTLS_ASN1_OID;
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extn_oid.p = p;
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p += extn_oid.len;
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/* Get optional critical */
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if( ( ret = mbedtls_asn1_get_bool( &p, end, &is_critical ) ) != 0 &&
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( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) )
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goto err;
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/* Data should be octet string type */
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if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
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MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
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goto err;
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end_ext_octet = p + len;
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if( end_ext_octet != end )
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{
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/*
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* Extension ::= SEQUENCE {
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* extnID OBJECT IDENTIFIER,
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* critical BOOLEAN DEFAULT FALSE,
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* extnValue OCTET STRING }
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*/
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mbedtls_x509_buf extn_oid = {0, 0, NULL};
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int is_critical = 0; /* DEFAULT FALSE */
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int ext_type = 0;
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if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
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MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
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return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
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end_ext_data = *p + len;
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/* Get extension ID */
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if( ( ret = mbedtls_asn1_get_tag( p, end_ext_data, &extn_oid.len,
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MBEDTLS_ASN1_OID ) ) != 0 )
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return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
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extn_oid.tag = MBEDTLS_ASN1_OID;
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extn_oid.p = *p;
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*p += extn_oid.len;
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/* Get optional critical */
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if( ( ret = mbedtls_asn1_get_bool( p, end_ext_data, &is_critical ) ) != 0 &&
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( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) )
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return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
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/* Data should be octet string type */
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if( ( ret = mbedtls_asn1_get_tag( p, end_ext_data, &len,
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MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
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return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
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end_ext_octet = *p + len;
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if( end_ext_octet != end_ext_data )
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return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
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MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
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/*
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* Detect supported extensions
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*/
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ret = mbedtls_oid_get_x509_ext_type( &extn_oid, &ext_type );
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if( ret != 0 )
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{
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/* No parser found, skip extension */
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*p = end_ext_octet;
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ret = MBEDTLS_ERR_ASN1_LENGTH_MISMATCH;
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goto err;
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}
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/*
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* Detect supported extensions
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*/
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ret = mbedtls_oid_get_x509_ext_type( &extn_oid, &ext_type );
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if( ret != 0 )
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{
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#if !defined(MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION)
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if( is_critical )
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{
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/* Data is marked as critical: fail */
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return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
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MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
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}
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#endif
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continue;
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}
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/* Forbid repeated extensions */
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if( ( crt->ext_types & ext_type ) != 0 )
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return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS );
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crt->ext_types |= ext_type;
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switch( ext_type )
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if( is_critical )
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{
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/* Data is marked as critical: fail */
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ret = MBEDTLS_ERR_ASN1_UNEXPECTED_TAG;
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goto err;
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}
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#endif
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return( 0 );
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}
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/* Forbid repeated extensions */
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if( ( crt->ext_types & ext_type ) != 0 )
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return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS );
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crt->ext_types |= ext_type;
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switch( ext_type )
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{
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case MBEDTLS_X509_EXT_BASIC_CONSTRAINTS:
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{
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int ca_istrue;
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int max_pathlen;
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/* Parse basic constraints */
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if( ( ret = x509_get_basic_constraints( p, end_ext_octet,
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&crt->ca_istrue, &crt->max_pathlen ) ) != 0 )
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return( ret );
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ret = x509_get_basic_constraints( &p, end_ext_octet,
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&ca_istrue,
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&max_pathlen );
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if( ret != 0 )
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goto err;
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crt->ca_istrue = ca_istrue;
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crt->max_pathlen = max_pathlen;
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break;
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}
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case MBEDTLS_X509_EXT_KEY_USAGE:
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/* Parse key usage */
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if( ( ret = x509_get_key_usage( p, end_ext_octet,
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&crt->key_usage ) ) != 0 )
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ret = x509_get_key_usage( &p, end_ext_octet,
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&crt->key_usage );
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if( ret != 0 )
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goto err;
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break;
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case MBEDTLS_X509_EXT_SUBJECT_ALT_NAME:
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/* Copy reference to raw subject alt name data. */
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crt->subject_alt_raw.p = p;
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crt->subject_alt_raw.len = end_ext_octet - p;
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if( ( ret = x509_get_subject_alt_name( p, end_ext_octet,
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&crt->subject_alt_names ) ) != 0 )
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{
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return( ret );
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}
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break;
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case MBEDTLS_X509_EXT_EXTENDED_KEY_USAGE:
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/* Parse extended key usage */
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crt->ext_key_usage_raw.p = *p;
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crt->ext_key_usage_raw.len = end_ext_octet - *p;
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if( ( ret = x509_get_ext_key_usage( p, end_ext_octet,
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&crt->ext_key_usage ) ) != 0 )
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return( ret );
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break;
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case MBEDTLS_X509_EXT_SUBJECT_ALT_NAME:
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/* Parse subject alt name */
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crt->subject_alt_raw.p = *p;
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crt->subject_alt_raw.len = end_ext_octet - *p;
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if( ( ret = x509_get_subject_alt_name( *p, end_ext_octet,
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&crt->subject_alt_names ) ) != 0 )
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crt->ext_key_usage_raw.p = p;
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crt->ext_key_usage_raw.len = end_ext_octet - p;
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if( ( ret = x509_get_ext_key_usage( &p, end_ext_octet,
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&crt->ext_key_usage ) ) != 0 )
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{
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return( ret );
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}
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*p = end_ext_octet;
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break;
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case MBEDTLS_X509_EXT_NS_CERT_TYPE:
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/* Parse netscape certificate type */
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if( ( ret = x509_get_ns_cert_type( p, end_ext_octet,
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&crt->ns_cert_type ) ) != 0 )
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return( ret );
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ret = x509_get_ns_cert_type( &p, end_ext_octet,
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&crt->ns_cert_type );
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if( ret != 0 )
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goto err;
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break;
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default:
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return( MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE );
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}
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/*
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* If this is a non-critical extension, which the oid layer
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* supports, but there isn't an X.509 parser for it,
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* skip the extension.
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*/
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#if !defined(MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION)
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if( is_critical )
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return( MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE );
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#endif
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p = end_ext_octet;
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}
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if( *p != end )
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return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
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MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
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return( 0 );
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err:
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return( ret );
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}
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static int x509_get_crt_ext( unsigned char **p,
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unsigned char *end,
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mbedtls_x509_crt *crt )
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{
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int ret;
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size_t len;
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if( *p == end )
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return( 0 );
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ret = mbedtls_asn1_get_tag( p, end, &len,
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MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 3 );
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if( ret != 0 )
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{
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goto err;
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}
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end = *p + len;
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ret = mbedtls_asn1_traverse_sequence_of( p, end,
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0xFF, MBEDTLS_ASN1_SEQUENCE | MBEDTLS_ASN1_CONSTRUCTED,
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0, 0, x509_crt_get_ext_cb, crt );
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if( ret != 0 )
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goto err;
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err:
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if( ret == MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE )
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return( ret );
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if( ret == MBEDTLS_ERR_X509_INVALID_EXTENSIONS )
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return( ret );
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if( ret != 0 )
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ret += MBEDTLS_ERR_X509_INVALID_EXTENSIONS;
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return( ret );
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}
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/*
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