OSX/libsecurity_apple_x509_cl/lib/DecodedItem.cpp

   1 /*
   2  * Copyright (c) 2002,2011,2014 Apple Inc. All Rights Reserved.
   3  *
   4  * The contents of this file constitute Original Code as defined in and are
   5  * subject to the Apple Public Source License Version 1.2 (the 'License').
   6  * You may not use this file except in compliance with the License. Please obtain
   7  * a copy of the License at http://www.apple.com/publicsource and read it before
   8  * using this file.
   9  *
  10  * This Original Code and all software distributed under the License are
  11  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESS
  12  * OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, INCLUDING WITHOUT
  13  * LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
  14  * PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. Please see the License for the
  15  * specific language governing rights and limitations under the License.
  16  */
  17
  18
  19 /*
  20  * DecodedItem.cpp - class representing the common portions of NSS-style
  21  * certs and CRLs, with extensions parsed and decoded (still in NSS
  22  * format).
  23  */
  24
  25 #include "DecodedItem.h"
  26 #include "cldebugging.h"
  27 #include "AppleX509CLSession.h"
  28 #include "CSPAttacher.h"
  29 #include "CLFieldsCommon.h"
  30 #include "clNssUtils.h"
  31 #include <Security/cssmapple.h>
  32
  33
  34 DecodedItem::DecodedItem(
  35         AppleX509CLSession      &session)
  36         :       mState(IS_Empty),
  37                 mAlloc(session),
  38                 mSession(session),
  39                 mDecodedExtensions(mCoder, session)
  40 {
  41 }
  42
  43 DecodedItem::~DecodedItem()
  44 {
  45         /* nothing for now */
  46 }
  47
  48 /*
  49  * Search for DecodedExten by AsnOid or "any unknown extension".
  50  * Called from getField*() and inferKeyUsage.
  51  * Returns NULL if specified extension not found.
  52  */
  53 const DecodedExten *DecodedItem::findDecodedExt(
  54         const CSSM_OID          &extnId,                // for known extensions
  55         bool                            unknown,                // otherwise
  56         uint32                          index,
  57         uint32                          &numFields) const
  58 {
  59         unsigned dex;
  60         const DecodedExten *rtnExt = NULL;
  61         unsigned found = 0;
  62
  63         for(dex=0; dex<mDecodedExtensions.numExtensions(); dex++) {
  64                 const DecodedExten *decodedExt = mDecodedExtensions.getExtension(dex);
  65                 /*
  66                  * known extensions: OID match AND successful decode (In case
  67                  *    we encountered a known extension which we couldn't
  68                  *    decode and fell back to giving the app an unparsed
  69                  *    BER blob).
  70                  * unknown extensions: just know that we didn't decode it
  71                  */
  72                 if( ( !unknown && !decodedExt->berEncoded() &&
  73                       (clCompareCssmData(&decodedExt->extnId(), &extnId))
  74                         ) ||
  75                     (unknown && decodedExt->berEncoded())
  76                    ) {
  77
  78                         if(found++ == index) {
  79                                 /* the one we want */
  80                                 rtnExt = decodedExt;
  81                         }
  82                         if((rtnExt != NULL) && (index != 0)) {
  83                                 /* only determine numFields on search for first one */
  84                                 break;
  85                         }
  86                 }
  87         }
  88         if(rtnExt != NULL) {
  89                 /* successful return  */
  90                 if(index == 0) {
  91                         numFields = found;
  92                 }
  93                 return rtnExt;
  94         }
  95         else {
  96                 return NULL;
  97         }
  98 }
  99