lib/detachedrep.h

   1 /*
   2  * Copyright (c) 2006-2008 Apple Inc. All Rights Reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 //
  25 // detachedrep - prefix diskrep representing a detached signature stored in a file
  26 //
  27 #ifndef _H_DETACHEDREP
  28 #define _H_DETACHEDREP
  29
  30 #include "diskrep.h"
  31 #include "sigblob.h"
  32
  33 namespace Security {
  34 namespace CodeSigning {
  35
  36
  37 //
  38 // We use a DetachedRep to interpose (filter) the genuine DiskRep representing
  39 // the code on disk, *if* a detached signature was set on this object. In this
  40 // situation, mRep will point to a (2 element) chain of DiskReps.
  41 //
  42 // This is a neat way of dealing with the (unusual) detached-signature case
  43 // without disturbing things unduly. Consider DetachedDiskRep to be closely
  44 // married to SecStaticCode; it's unlikely to work right if you use it elsewhere.
  45 //
  46 // Note that there's no *writing* code here. Writing detached signatures is handled
  47 // specially in the signing code.
  48 //
  49 class DetachedRep : public FilterRep {
  50 public:
  51         DetachedRep(CFDataRef sig, DiskRep *orig, const std::string &source); // SuperBlob of all architectures
  52         DetachedRep(CFDataRef sig, CFDataRef gsig, DiskRep *orig, const std::string &source); // one architecture + globals
  53
  54         CFDataRef component(CodeDirectory::SpecialSlot slot);
  55
  56         const std::string &source() const { return mSource; }
  57
  58 private:
  59         CFRef<CFDataRef> mSig, mGSig;
  60         const EmbeddedSignatureBlob *mArch;             // current architecture; points into mSignature
  61         const EmbeddedSignatureBlob *mGlobal;   // shared elements; points into mSignature
  62         std::string mSource;                                    // source description (readable)
  63 };
  64
  65
  66 } // end namespace CodeSigning
  67 } // end namespace Security
  68
  69 #endif // !_H_DETACHEDREP