The Tor Browser: security/nss/lib/certdb/certxutl.c@b8a032363ba2 (annotated)

security/nss/lib/certdb/certxutl.c@b8a032363ba2 (annotated)

security/nss/lib/certdb/certxutl.c

Thu, 22 Jan 2015 13:21:57 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Thu, 22 Jan 2015 13:21:57 +0100
branch: TOR_BUG_9701
changeset 15: b8a032363ba2
permissions: -rw-r--r--

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 /*
  * 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;
     PLArenaPool *ownerArena;
     PLArenaPool *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, PLArenaPool *ownerArena,
    void (*setExts)(void *object, CERTCertExtension **exts))
 {
     PLArenaPool *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 = '\0';
   /* 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_ASN1_GET(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;
 }
 SECStatus
 CERT_MergeExtensions(void *exthandle, CERTCertExtension **extensions)
 {
     CERTCertExtension *ext;
     SECStatus rv = SECSuccess;
     SECOidTag tag;
     extNode *node;
     extRec *handle = exthandle;
     if (!exthandle || !extensions) {
 	PORT_SetError(SEC_ERROR_INVALID_ARGS);
         return SECFailure;
     }
     while ((ext = *extensions++) != NULL) {
         tag = SECOID_FindOIDTag(&ext->id);
         for (node=handle->head; node != NULL; node=node->next) {
             if (tag == 0) {
                 if (SECITEM_ItemsAreEqual(&ext->id, &node->ext->id))
                     break;
             }
             else {
                 if (SECOID_FindOIDTag(&node->ext->id) == tag) {
                     break;
                 }
             }
         }
         if (node == NULL) {
             PRBool critical = (ext->critical.len != 0 &&
                             ext->critical.data[ext->critical.len - 1] != 0);
             if (critical && tag == SEC_OID_UNKNOWN) {
                PORT_SetError(SEC_ERROR_UNKNOWN_CRITICAL_EXTENSION);
                rv = SECFailure;
                break;
             }
             /* add to list */
             rv = CERT_AddExtensionByOID (exthandle, &ext->id, &ext->value,
                                          critical, PR_TRUE);
             if (rv != SECSuccess)
                 break;
         }
     }
     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;
     PLArenaPool *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_QuickDERDecodeItem(arena, &tmpItem,
                                 SEC_ASN1_GET(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);
 }

The Tor Browser / annotate

security/nss/lib/certdb/certxutl.c@b8a032363ba2 (annotated)

security/nss/lib/certdb/certxutl.c