certxutl.c
上传用户:lyxiangda
上传日期:2007-01-12
资源大小:3042k
文件大小:11k
- /*
- * 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 Netscape are
- * Copyright (C) 1994-2000 Netscape Communications Corporation. All
- * Rights Reserved.
- *
- * Contributor(s):
- *
- * Alternatively, the contents of this file may be used under the
- * terms of the GNU General Public License Version 2 or later (the
- * "GPL"), in which case the provisions of the GPL are applicable
- * instead of those above. If you wish to allow use of your
- * version of this file only under the terms of the GPL and not to
- * allow others to use your version of this file under the MPL,
- * indicate your decision by deleting the provisions above and
- * replace them with the notice and other provisions required by
- * the GPL. If you do not delete the provisions above, a recipient
- * may use your version of this file under either the MPL or the
- * GPL.
- */
- /*
- * Certificate Extensions handling code
- *
- */
- #include "cert.h"
- #include "secitem.h"
- #include "secoid.h"
- #include "secder.h"
- #include "secasn1.h"
- #include "certxutl.h"
- #include "secerr.h"
- #ifdef OLD
- #include "ocspti.h" /* XXX a better extensions interface would not
- * require knowledge of data structures of callers */
- #endif
- static CERTCertExtension *
- GetExtension (CERTCertExtension **extensions, SECItem *oid)
- {
- CERTCertExtension **exts;
- CERTCertExtension *ext = NULL;
- SECComparison comp;
- exts = extensions;
-
- if (exts) {
- while ( *exts ) {
- ext = *exts;
- comp = SECITEM_CompareItem(oid, &ext->id);
- if ( comp == SECEqual )
- break;
- exts++;
- }
- return (*exts ? ext : NULL);
- }
- return (NULL);
- }
- SECStatus
- cert_FindExtensionByOID (CERTCertExtension **extensions, SECItem *oid, SECItem *value)
- {
- CERTCertExtension *ext;
- SECStatus rv = SECSuccess;
-
- ext = GetExtension (extensions, oid);
- if (ext == NULL) {
- PORT_SetError (SEC_ERROR_EXTENSION_NOT_FOUND);
- return (SECFailure);
- }
- if (value)
- rv = SECITEM_CopyItem(NULL, value, &ext->value);
- return (rv);
- }
-
- SECStatus
- CERT_GetExtenCriticality (CERTCertExtension **extensions, int tag, PRBool *isCritical)
- {
- CERTCertExtension *ext;
- SECOidData *oid;
- if (!isCritical)
- return (SECSuccess);
-
- /* find the extension in the extensions list */
- oid = SECOID_FindOIDByTag((SECOidTag)tag);
- if ( !oid ) {
- return(SECFailure);
- }
- ext = GetExtension (extensions, &oid->oid);
- if (ext == NULL) {
- PORT_SetError (SEC_ERROR_EXTENSION_NOT_FOUND);
- return (SECFailure);
- }
- /* If the criticality is omitted, then it is false by default.
- ex->critical.data is NULL */
- if (ext->critical.data == NULL)
- *isCritical = PR_FALSE;
- else
- *isCritical = (ext->critical.data[0] == 0xff) ? PR_TRUE : PR_FALSE;
- return (SECSuccess);
- }
- SECStatus
- cert_FindExtension(CERTCertExtension **extensions, int tag, SECItem *value)
- {
- SECOidData *oid;
-
- oid = SECOID_FindOIDByTag((SECOidTag)tag);
- if ( !oid ) {
- return(SECFailure);
- }
- return(cert_FindExtensionByOID(extensions, &oid->oid, value));
- }
- typedef struct _extNode {
- struct _extNode *next;
- CERTCertExtension *ext;
- } extNode;
- typedef struct {
- void (*setExts)(void *object, CERTCertExtension **exts);
- void *object;
- PRArenaPool *ownerArena;
- PRArenaPool *arena;
- extNode *head;
- int count;
- }extRec;
- /*
- * cert_StartExtensions
- *
- * NOTE: This interface changed significantly to remove knowledge
- * about callers data structures (owner objects)
- */
- void *
- cert_StartExtensions(void *owner, PRArenaPool *ownerArena,
- void (*setExts)(void *object, CERTCertExtension **exts))
- {
- PRArenaPool *arena;
- extRec *handle;
-
- arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
- if ( !arena ) {
- return(0);
- }
- handle = (extRec *)PORT_ArenaAlloc(arena, sizeof(extRec));
- if ( !handle ) {
- PORT_FreeArena(arena, PR_FALSE);
- return(0);
- }
- handle->object = owner;
- handle->ownerArena = ownerArena;
- handle->setExts = setExts;
- handle->arena = arena;
- handle->head = 0;
- handle->count = 0;
-
- return(handle);
- }
- static unsigned char hextrue = 0xff;
- /*
- * Note - assumes that data pointed to by oid->data will not move
- */
- SECStatus
- CERT_AddExtensionByOID (void *exthandle, SECItem *oid, SECItem *value,
- PRBool critical, PRBool copyData)
- {
- CERTCertExtension *ext;
- SECStatus rv;
- extNode *node;
- extRec *handle;
-
- handle = (extRec *)exthandle;
- /* allocate space for extension and list node */
- ext = (CERTCertExtension*)PORT_ArenaZAlloc(handle->ownerArena,
- sizeof(CERTCertExtension));
- if ( !ext ) {
- return(SECFailure);
- }
- node = (extNode*)PORT_ArenaAlloc(handle->arena, sizeof(extNode));
- if ( !node ) {
- return(SECFailure);
- }
- /* add to list */
- node->next = handle->head;
- handle->head = node;
-
- /* point to ext struct */
- node->ext = ext;
-
- /* the object ID of the extension */
- ext->id = *oid;
-
- /* set critical field */
- if ( critical ) {
- ext->critical.data = (unsigned char*)&hextrue;
- ext->critical.len = 1;
- }
- /* set the value */
- if ( copyData ) {
- rv = SECITEM_CopyItem(handle->ownerArena, &ext->value, value);
- if ( rv ) {
- return(SECFailure);
- }
- } else {
- ext->value = *value;
- }
-
- handle->count++;
-
- return(SECSuccess);
- }
- SECStatus
- CERT_AddExtension(void *exthandle, int idtag, SECItem *value,
- PRBool critical, PRBool copyData)
- {
- SECOidData *oid;
-
- oid = SECOID_FindOIDByTag((SECOidTag)idtag);
- if ( !oid ) {
- return(SECFailure);
- }
- return(CERT_AddExtensionByOID(exthandle, &oid->oid, value, critical, copyData));
- }
- SECStatus
- CERT_EncodeAndAddExtension(void *exthandle, int idtag, void *value,
- PRBool critical, const SEC_ASN1Template *atemplate)
- {
- extRec *handle;
- SECItem *encitem;
- handle = (extRec *)exthandle;
- encitem = SEC_ASN1EncodeItem(handle->ownerArena, NULL, value, atemplate);
- if ( encitem == NULL ) {
- return(SECFailure);
- }
- return CERT_AddExtension(exthandle, idtag, encitem, critical, PR_FALSE);
- }
- void
- PrepareBitStringForEncoding (SECItem *bitsmap, SECItem *value)
- {
- unsigned char onebyte;
- unsigned int i, len = 0;
- /* to prevent warning on some platform at compile time */
- onebyte = ' ';
- /* Get the position of the right-most turn-on bit */
- for (i = 0; i < (value->len ) * 8; ++i) {
- if (i % 8 == 0)
- onebyte = value->data[i/8];
- if (onebyte & 0x80)
- len = i;
- onebyte <<= 1;
-
- }
- bitsmap->data = value->data;
- /* Add one here since we work with base 1 */
- bitsmap->len = len + 1;
- }
- SECStatus
- CERT_EncodeAndAddBitStrExtension (void *exthandle, int idtag,
- SECItem *value, PRBool critical)
- {
- SECItem bitsmap;
-
- PrepareBitStringForEncoding (&bitsmap, value);
- return (CERT_EncodeAndAddExtension
- (exthandle, idtag, &bitsmap, critical, SEC_BitStringTemplate));
- }
- SECStatus
- CERT_FinishExtensions(void *exthandle)
- {
- extRec *handle;
- extNode *node;
- CERTCertExtension **exts;
- SECStatus rv = SECFailure;
-
- handle = (extRec *)exthandle;
- /* allocate space for extensions array */
- exts = PORT_ArenaNewArray(handle->ownerArena, CERTCertExtension *,
- handle->count + 1);
- if (exts == NULL) {
- goto loser;
- }
- /* put extensions in owner object and update its version number */
- #ifdef OLD
- switch (handle->type) {
- case CertificateExtensions:
- handle->owner.cert->extensions = exts;
- DER_SetUInteger (ownerArena, &(handle->owner.cert->version),
- SEC_CERTIFICATE_VERSION_3);
- break;
- case CrlExtensions:
- handle->owner.crl->extensions = exts;
- DER_SetUInteger (ownerArena, &(handle->owner.crl->version),
- SEC_CRL_VERSION_2);
- break;
- case OCSPRequestExtensions:
- handle->owner.request->tbsRequest->requestExtensions = exts;
- break;
- case OCSPSingleRequestExtensions:
- handle->owner.singleRequest->singleRequestExtensions = exts;
- break;
- case OCSPResponseSingleExtensions:
- handle->owner.singleResponse->singleExtensions = exts;
- break;
- }
- #endif
- handle->setExts(handle->object, exts);
-
- /* update the version number */
- /* copy each extension pointer */
- node = handle->head;
- while ( node ) {
- *exts = node->ext;
-
- node = node->next;
- exts++;
- }
- /* terminate the array of extensions */
- *exts = 0;
- rv = SECSuccess;
- loser:
- /* free working arena */
- PORT_FreeArena(handle->arena, PR_FALSE);
- return rv;
- }
- /*
- * get the value of the Netscape Certificate Type Extension
- */
- SECStatus
- CERT_FindBitStringExtension (CERTCertExtension **extensions, int tag,
- SECItem *retItem)
- {
- SECItem wrapperItem, tmpItem = {siBuffer,0};
- SECStatus rv;
- PRArenaPool *arena = NULL;
-
- wrapperItem.data = NULL;
- tmpItem.data = NULL;
-
- arena = PORT_NewArena(DER_DEFAULT_CHUNKSIZE);
-
- if ( ! arena ) {
- return(SECFailure);
- }
-
- rv = cert_FindExtension(extensions, tag, &wrapperItem);
- if ( rv != SECSuccess ) {
- goto loser;
- }
- rv = SEC_ASN1DecodeItem(arena, &tmpItem, SEC_BitStringTemplate,
- &wrapperItem);
- if ( rv != SECSuccess ) {
- goto loser;
- }
- retItem->data = (unsigned char *)PORT_Alloc( ( tmpItem.len + 7 ) >> 3 );
- if ( retItem->data == NULL ) {
- goto loser;
- }
-
- PORT_Memcpy(retItem->data, tmpItem.data, ( tmpItem.len + 7 ) >> 3);
- retItem->len = tmpItem.len;
-
- rv = SECSuccess;
- goto done;
-
- loser:
- rv = SECFailure;
- done:
- if ( arena ) {
- PORT_FreeArena(arena, PR_FALSE);
- }
-
- if ( wrapperItem.data ) {
- PORT_Free(wrapperItem.data);
- }
- return(rv);
- }
- PRBool
- cert_HasCriticalExtension (CERTCertExtension **extensions)
- {
- CERTCertExtension **exts;
- CERTCertExtension *ext = NULL;
- PRBool hasCriticalExten = PR_FALSE;
-
- exts = extensions;
-
- if (exts) {
- while ( *exts ) {
- ext = *exts;
- /* If the criticality is omitted, it's non-critical */
- if (ext->critical.data && ext->critical.data[0] == 0xff) {
- hasCriticalExten = PR_TRUE;
- break;
- }
- exts++;
- }
- }
- return (hasCriticalExten);
- }
- PRBool
- cert_HasUnknownCriticalExten (CERTCertExtension **extensions)
- {
- CERTCertExtension **exts;
- CERTCertExtension *ext = NULL;
- PRBool hasUnknownCriticalExten = PR_FALSE;
-
- exts = extensions;
-
- if (exts) {
- while ( *exts ) {
- ext = *exts;
- /* If the criticality is omitted, it's non-critical.
- If an extension is critical, make sure that we know
- how to process the extension.
- */
- if (ext->critical.data && ext->critical.data[0] == 0xff) {
- if (SECOID_KnownCertExtenOID (&ext->id) == PR_FALSE) {
- hasUnknownCriticalExten = PR_TRUE;
- break;
- }
- }
- exts++;
- }
- }
- return (hasUnknownCriticalExten);
- }