mirror of
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400 lines
10 KiB
C
400 lines
10 KiB
C
/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is the Netscape security libraries.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1994-2000
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/*
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* Code for dealing with X509.V3 extensions.
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*
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* $Id: certv3.c,v 1.10 2007/10/12 01:44:40 julien.pierre.boogz%sun.com Exp $
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*/
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#include "cert.h"
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#include "secitem.h"
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#include "secoid.h"
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#include "secder.h"
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#include "secasn1.h"
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#include "certxutl.h"
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#include "secerr.h"
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SECStatus
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CERT_FindCertExtensionByOID(CERTCertificate *cert, SECItem *oid,
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SECItem *value)
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{
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return (cert_FindExtensionByOID (cert->extensions, oid, value));
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}
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SECStatus
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CERT_FindCertExtension(CERTCertificate *cert, int tag, SECItem *value)
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{
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return (cert_FindExtension (cert->extensions, tag, value));
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}
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static void
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SetExts(void *object, CERTCertExtension **exts)
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{
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CERTCertificate *cert = (CERTCertificate *)object;
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cert->extensions = exts;
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DER_SetUInteger (cert->arena, &(cert->version), SEC_CERTIFICATE_VERSION_3);
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}
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void *
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CERT_StartCertExtensions(CERTCertificate *cert)
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{
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return (cert_StartExtensions ((void *)cert, cert->arena, SetExts));
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}
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/* find the given extension in the certificate of the Issuer of 'cert' */
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SECStatus
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CERT_FindIssuerCertExtension(CERTCertificate *cert, int tag, SECItem *value)
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{
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CERTCertificate *issuercert;
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SECStatus rv;
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issuercert = CERT_FindCertByName(cert->dbhandle, &cert->derIssuer);
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if ( issuercert ) {
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rv = cert_FindExtension(issuercert->extensions, tag, value);
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CERT_DestroyCertificate(issuercert);
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} else {
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rv = SECFailure;
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}
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return(rv);
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}
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/* find a URL extension in the cert or its CA
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* apply the base URL string if it exists
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*/
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char *
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CERT_FindCertURLExtension(CERTCertificate *cert, int tag, int catag)
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{
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SECStatus rv;
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SECItem urlitem = {siBuffer,0};
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SECItem baseitem = {siBuffer,0};
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SECItem urlstringitem = {siBuffer,0};
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SECItem basestringitem = {siBuffer,0};
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PRArenaPool *arena = NULL;
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PRBool hasbase;
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char *urlstring;
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char *str;
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int len;
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unsigned int i;
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urlstring = NULL;
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arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
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if ( ! arena ) {
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goto loser;
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}
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hasbase = PR_FALSE;
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rv = cert_FindExtension(cert->extensions, tag, &urlitem);
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if ( rv == SECSuccess ) {
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rv = cert_FindExtension(cert->extensions, SEC_OID_NS_CERT_EXT_BASE_URL,
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&baseitem);
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if ( rv == SECSuccess ) {
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hasbase = PR_TRUE;
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}
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} else if ( catag ) {
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/* if the cert doesn't have the extensions, see if the issuer does */
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rv = CERT_FindIssuerCertExtension(cert, catag, &urlitem);
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if ( rv != SECSuccess ) {
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goto loser;
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}
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rv = CERT_FindIssuerCertExtension(cert, SEC_OID_NS_CERT_EXT_BASE_URL,
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&baseitem);
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if ( rv == SECSuccess ) {
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hasbase = PR_TRUE;
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}
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} else {
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goto loser;
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}
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rv = SEC_QuickDERDecodeItem(arena, &urlstringitem,
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SEC_ASN1_GET(SEC_IA5StringTemplate), &urlitem);
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if ( rv != SECSuccess ) {
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goto loser;
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}
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if ( hasbase ) {
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rv = SEC_QuickDERDecodeItem(arena, &basestringitem,
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SEC_ASN1_GET(SEC_IA5StringTemplate),
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&baseitem);
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if ( rv != SECSuccess ) {
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goto loser;
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}
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}
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len = urlstringitem.len + ( hasbase ? basestringitem.len : 0 ) + 1;
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str = urlstring = (char *)PORT_Alloc(len);
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if ( urlstring == NULL ) {
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goto loser;
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}
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/* copy the URL base first */
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if ( hasbase ) {
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/* if the urlstring has a : in it, then we assume it is an absolute
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* URL, and will not get the base string pre-pended
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*/
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for ( i = 0; i < urlstringitem.len; i++ ) {
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if ( urlstringitem.data[i] == ':' ) {
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goto nobase;
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}
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}
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PORT_Memcpy(str, basestringitem.data, basestringitem.len);
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str += basestringitem.len;
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}
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nobase:
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/* copy the rest (or all) of the URL */
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PORT_Memcpy(str, urlstringitem.data, urlstringitem.len);
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str += urlstringitem.len;
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*str = '\0';
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goto done;
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loser:
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if ( urlstring ) {
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PORT_Free(urlstring);
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}
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urlstring = NULL;
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done:
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if ( arena ) {
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PORT_FreeArena(arena, PR_FALSE);
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}
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if ( baseitem.data ) {
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PORT_Free(baseitem.data);
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}
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if ( urlitem.data ) {
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PORT_Free(urlitem.data);
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}
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return(urlstring);
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}
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/*
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* get the value of the Netscape Certificate Type Extension
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*/
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SECStatus
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CERT_FindNSCertTypeExtension(CERTCertificate *cert, SECItem *retItem)
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{
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return (CERT_FindBitStringExtension
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(cert->extensions, SEC_OID_NS_CERT_EXT_CERT_TYPE, retItem));
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}
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/*
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* get the value of a string type extension
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*/
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char *
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CERT_FindNSStringExtension(CERTCertificate *cert, int oidtag)
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{
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SECItem wrapperItem, tmpItem = {siBuffer,0};
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SECStatus rv;
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PRArenaPool *arena = NULL;
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char *retstring = NULL;
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wrapperItem.data = NULL;
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tmpItem.data = NULL;
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arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
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if ( ! arena ) {
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goto loser;
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}
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rv = cert_FindExtension(cert->extensions, oidtag,
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&wrapperItem);
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if ( rv != SECSuccess ) {
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goto loser;
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}
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rv = SEC_QuickDERDecodeItem(arena, &tmpItem,
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SEC_ASN1_GET(SEC_IA5StringTemplate), &wrapperItem);
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if ( rv != SECSuccess ) {
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goto loser;
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}
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retstring = (char *)PORT_Alloc(tmpItem.len + 1 );
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if ( retstring == NULL ) {
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goto loser;
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}
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PORT_Memcpy(retstring, tmpItem.data, tmpItem.len);
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retstring[tmpItem.len] = '\0';
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loser:
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if ( arena ) {
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PORT_FreeArena(arena, PR_FALSE);
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}
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if ( wrapperItem.data ) {
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PORT_Free(wrapperItem.data);
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}
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return(retstring);
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}
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/*
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* get the value of the X.509 v3 Key Usage Extension
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*/
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SECStatus
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CERT_FindKeyUsageExtension(CERTCertificate *cert, SECItem *retItem)
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{
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return (CERT_FindBitStringExtension(cert->extensions,
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SEC_OID_X509_KEY_USAGE, retItem));
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}
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/*
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* get the value of the X.509 v3 Key Usage Extension
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*/
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SECStatus
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CERT_FindSubjectKeyIDExtension(CERTCertificate *cert, SECItem *retItem)
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{
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SECStatus rv;
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SECItem encodedValue = {siBuffer, NULL, 0 };
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SECItem decodedValue = {siBuffer, NULL, 0 };
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rv = cert_FindExtension
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(cert->extensions, SEC_OID_X509_SUBJECT_KEY_ID, &encodedValue);
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if (rv == SECSuccess) {
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PLArenaPool * tmpArena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
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if (tmpArena) {
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rv = SEC_QuickDERDecodeItem(tmpArena, &decodedValue,
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SEC_ASN1_GET(SEC_OctetStringTemplate),
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&encodedValue);
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if (rv == SECSuccess) {
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rv = SECITEM_CopyItem(NULL, retItem, &decodedValue);
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}
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PORT_FreeArena(tmpArena, PR_FALSE);
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} else {
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rv = SECFailure;
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}
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}
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SECITEM_FreeItem(&encodedValue, PR_FALSE);
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return rv;
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}
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SECStatus
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CERT_FindBasicConstraintExten(CERTCertificate *cert,
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CERTBasicConstraints *value)
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{
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SECItem encodedExtenValue;
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SECStatus rv;
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encodedExtenValue.data = NULL;
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encodedExtenValue.len = 0;
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rv = cert_FindExtension(cert->extensions, SEC_OID_X509_BASIC_CONSTRAINTS,
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&encodedExtenValue);
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if ( rv != SECSuccess ) {
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return (rv);
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}
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rv = CERT_DecodeBasicConstraintValue (value, &encodedExtenValue);
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/* free the raw extension data */
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PORT_Free(encodedExtenValue.data);
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encodedExtenValue.data = NULL;
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return(rv);
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}
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CERTAuthKeyID *
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CERT_FindAuthKeyIDExten (PRArenaPool *arena, CERTCertificate *cert)
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{
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SECItem encodedExtenValue;
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SECStatus rv;
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CERTAuthKeyID *ret;
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encodedExtenValue.data = NULL;
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encodedExtenValue.len = 0;
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rv = cert_FindExtension(cert->extensions, SEC_OID_X509_AUTH_KEY_ID,
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&encodedExtenValue);
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if ( rv != SECSuccess ) {
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return (NULL);
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}
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ret = CERT_DecodeAuthKeyID (arena, &encodedExtenValue);
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PORT_Free(encodedExtenValue.data);
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encodedExtenValue.data = NULL;
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return(ret);
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}
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SECStatus
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CERT_CheckCertUsage(CERTCertificate *cert, unsigned char usage)
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{
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SECItem keyUsage;
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SECStatus rv;
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/* There is no extension, v1 or v2 certificate */
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if (cert->extensions == NULL) {
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return (SECSuccess);
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}
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keyUsage.data = NULL;
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/* This code formerly ignored the Key Usage extension if it was
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** marked non-critical. That was wrong. Since we do understand it,
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** we are obligated to honor it, whether or not it is critical.
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*/
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rv = CERT_FindKeyUsageExtension(cert, &keyUsage);
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if (rv == SECFailure) {
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rv = (PORT_GetError () == SEC_ERROR_EXTENSION_NOT_FOUND) ?
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SECSuccess : SECFailure;
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} else if (!(keyUsage.data[0] & usage)) {
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PORT_SetError (SEC_ERROR_CERT_USAGES_INVALID);
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rv = SECFailure;
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}
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PORT_Free (keyUsage.data);
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return (rv);
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}
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