gecko/security/nss/lib/certdb/certv3.c

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2008-06-06 05:40:11 -07:00
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is the Netscape security libraries.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1994-2000
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either the GNU General Public License Version 2 or later (the "GPL"), or
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
/*
* Code for dealing with X509.V3 extensions.
*
* $Id: certv3.c,v 1.10 2007/10/12 01:44:40 julien.pierre.boogz%sun.com Exp $
*/
#include "cert.h"
#include "secitem.h"
#include "secoid.h"
#include "secder.h"
#include "secasn1.h"
#include "certxutl.h"
#include "secerr.h"
SECStatus
CERT_FindCertExtensionByOID(CERTCertificate *cert, SECItem *oid,
SECItem *value)
{
return (cert_FindExtensionByOID (cert->extensions, oid, value));
}
SECStatus
CERT_FindCertExtension(CERTCertificate *cert, int tag, SECItem *value)
{
return (cert_FindExtension (cert->extensions, tag, value));
}
static void
SetExts(void *object, CERTCertExtension **exts)
{
CERTCertificate *cert = (CERTCertificate *)object;
cert->extensions = exts;
DER_SetUInteger (cert->arena, &(cert->version), SEC_CERTIFICATE_VERSION_3);
}
void *
CERT_StartCertExtensions(CERTCertificate *cert)
{
return (cert_StartExtensions ((void *)cert, cert->arena, SetExts));
}
/* find the given extension in the certificate of the Issuer of 'cert' */
SECStatus
CERT_FindIssuerCertExtension(CERTCertificate *cert, int tag, SECItem *value)
{
CERTCertificate *issuercert;
SECStatus rv;
issuercert = CERT_FindCertByName(cert->dbhandle, &cert->derIssuer);
if ( issuercert ) {
rv = cert_FindExtension(issuercert->extensions, tag, value);
CERT_DestroyCertificate(issuercert);
} else {
rv = SECFailure;
}
return(rv);
}
/* find a URL extension in the cert or its CA
* apply the base URL string if it exists
*/
char *
CERT_FindCertURLExtension(CERTCertificate *cert, int tag, int catag)
{
SECStatus rv;
SECItem urlitem = {siBuffer,0};
SECItem baseitem = {siBuffer,0};
SECItem urlstringitem = {siBuffer,0};
SECItem basestringitem = {siBuffer,0};
PRArenaPool *arena = NULL;
PRBool hasbase;
char *urlstring;
char *str;
int len;
unsigned int i;
urlstring = NULL;
arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
if ( ! arena ) {
goto loser;
}
hasbase = PR_FALSE;
rv = cert_FindExtension(cert->extensions, tag, &urlitem);
if ( rv == SECSuccess ) {
rv = cert_FindExtension(cert->extensions, SEC_OID_NS_CERT_EXT_BASE_URL,
&baseitem);
if ( rv == SECSuccess ) {
hasbase = PR_TRUE;
}
} else if ( catag ) {
/* if the cert doesn't have the extensions, see if the issuer does */
rv = CERT_FindIssuerCertExtension(cert, catag, &urlitem);
if ( rv != SECSuccess ) {
goto loser;
}
rv = CERT_FindIssuerCertExtension(cert, SEC_OID_NS_CERT_EXT_BASE_URL,
&baseitem);
if ( rv == SECSuccess ) {
hasbase = PR_TRUE;
}
} else {
goto loser;
}
rv = SEC_QuickDERDecodeItem(arena, &urlstringitem,
SEC_ASN1_GET(SEC_IA5StringTemplate), &urlitem);
if ( rv != SECSuccess ) {
goto loser;
}
if ( hasbase ) {
rv = SEC_QuickDERDecodeItem(arena, &basestringitem,
SEC_ASN1_GET(SEC_IA5StringTemplate),
&baseitem);
if ( rv != SECSuccess ) {
goto loser;
}
}
len = urlstringitem.len + ( hasbase ? basestringitem.len : 0 ) + 1;
str = urlstring = (char *)PORT_Alloc(len);
if ( urlstring == NULL ) {
goto loser;
}
/* copy the URL base first */
if ( hasbase ) {
/* if the urlstring has a : in it, then we assume it is an absolute
* URL, and will not get the base string pre-pended
*/
for ( i = 0; i < urlstringitem.len; i++ ) {
if ( urlstringitem.data[i] == ':' ) {
goto nobase;
}
}
PORT_Memcpy(str, basestringitem.data, basestringitem.len);
str += basestringitem.len;
}
nobase:
/* copy the rest (or all) of the URL */
PORT_Memcpy(str, urlstringitem.data, urlstringitem.len);
str += urlstringitem.len;
*str = '\0';
goto done;
loser:
if ( urlstring ) {
PORT_Free(urlstring);
}
urlstring = NULL;
done:
if ( arena ) {
PORT_FreeArena(arena, PR_FALSE);
}
if ( baseitem.data ) {
PORT_Free(baseitem.data);
}
if ( urlitem.data ) {
PORT_Free(urlitem.data);
}
return(urlstring);
}
/*
* get the value of the Netscape Certificate Type Extension
*/
SECStatus
CERT_FindNSCertTypeExtension(CERTCertificate *cert, SECItem *retItem)
{
return (CERT_FindBitStringExtension
(cert->extensions, SEC_OID_NS_CERT_EXT_CERT_TYPE, retItem));
}
/*
* get the value of a string type extension
*/
char *
CERT_FindNSStringExtension(CERTCertificate *cert, int oidtag)
{
SECItem wrapperItem, tmpItem = {siBuffer,0};
SECStatus rv;
PRArenaPool *arena = NULL;
char *retstring = NULL;
wrapperItem.data = NULL;
tmpItem.data = NULL;
arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
if ( ! arena ) {
goto loser;
}
rv = cert_FindExtension(cert->extensions, oidtag,
&wrapperItem);
if ( rv != SECSuccess ) {
goto loser;
}
rv = SEC_QuickDERDecodeItem(arena, &tmpItem,
SEC_ASN1_GET(SEC_IA5StringTemplate), &wrapperItem);
if ( rv != SECSuccess ) {
goto loser;
}
retstring = (char *)PORT_Alloc(tmpItem.len + 1 );
if ( retstring == NULL ) {
goto loser;
}
PORT_Memcpy(retstring, tmpItem.data, tmpItem.len);
retstring[tmpItem.len] = '\0';
loser:
if ( arena ) {
PORT_FreeArena(arena, PR_FALSE);
}
if ( wrapperItem.data ) {
PORT_Free(wrapperItem.data);
}
return(retstring);
}
/*
* get the value of the X.509 v3 Key Usage Extension
*/
SECStatus
CERT_FindKeyUsageExtension(CERTCertificate *cert, SECItem *retItem)
{
return (CERT_FindBitStringExtension(cert->extensions,
SEC_OID_X509_KEY_USAGE, retItem));
}
/*
* get the value of the X.509 v3 Key Usage Extension
*/
SECStatus
CERT_FindSubjectKeyIDExtension(CERTCertificate *cert, SECItem *retItem)
{
SECStatus rv;
SECItem encodedValue = {siBuffer, NULL, 0 };
SECItem decodedValue = {siBuffer, NULL, 0 };
rv = cert_FindExtension
(cert->extensions, SEC_OID_X509_SUBJECT_KEY_ID, &encodedValue);
if (rv == SECSuccess) {
PLArenaPool * tmpArena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
if (tmpArena) {
rv = SEC_QuickDERDecodeItem(tmpArena, &decodedValue,
SEC_ASN1_GET(SEC_OctetStringTemplate),
&encodedValue);
if (rv == SECSuccess) {
rv = SECITEM_CopyItem(NULL, retItem, &decodedValue);
}
PORT_FreeArena(tmpArena, PR_FALSE);
} else {
rv = SECFailure;
}
}
SECITEM_FreeItem(&encodedValue, PR_FALSE);
return rv;
}
SECStatus
CERT_FindBasicConstraintExten(CERTCertificate *cert,
CERTBasicConstraints *value)
{
SECItem encodedExtenValue;
SECStatus rv;
encodedExtenValue.data = NULL;
encodedExtenValue.len = 0;
rv = cert_FindExtension(cert->extensions, SEC_OID_X509_BASIC_CONSTRAINTS,
&encodedExtenValue);
if ( rv != SECSuccess ) {
return (rv);
}
rv = CERT_DecodeBasicConstraintValue (value, &encodedExtenValue);
/* free the raw extension data */
PORT_Free(encodedExtenValue.data);
encodedExtenValue.data = NULL;
return(rv);
}
CERTAuthKeyID *
CERT_FindAuthKeyIDExten (PRArenaPool *arena, CERTCertificate *cert)
{
SECItem encodedExtenValue;
SECStatus rv;
CERTAuthKeyID *ret;
encodedExtenValue.data = NULL;
encodedExtenValue.len = 0;
rv = cert_FindExtension(cert->extensions, SEC_OID_X509_AUTH_KEY_ID,
&encodedExtenValue);
if ( rv != SECSuccess ) {
return (NULL);
}
ret = CERT_DecodeAuthKeyID (arena, &encodedExtenValue);
PORT_Free(encodedExtenValue.data);
encodedExtenValue.data = NULL;
return(ret);
}
SECStatus
CERT_CheckCertUsage(CERTCertificate *cert, unsigned char usage)
{
SECItem keyUsage;
SECStatus rv;
/* There is no extension, v1 or v2 certificate */
if (cert->extensions == NULL) {
return (SECSuccess);
}
keyUsage.data = NULL;
/* This code formerly ignored the Key Usage extension if it was
** marked non-critical. That was wrong. Since we do understand it,
** we are obligated to honor it, whether or not it is critical.
*/
rv = CERT_FindKeyUsageExtension(cert, &keyUsage);
if (rv == SECFailure) {
rv = (PORT_GetError () == SEC_ERROR_EXTENSION_NOT_FOUND) ?
SECSuccess : SECFailure;
} else if (!(keyUsage.data[0] & usage)) {
PORT_SetError (SEC_ERROR_CERT_USAGES_INVALID);
rv = SECFailure;
}
PORT_Free (keyUsage.data);
return (rv);
}