lib/cfmdiskrep.h

   1 /*
   2  * Copyright (c) 2007 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 // cfmdiskrep - single-file CFM (PEF) executable disk representation
  26 //
  27 #ifndef _H_CFMDISKREP
  28 #define _H_CFMDISKREP
  29
  30 #include "singlediskrep.h"
  31 #include "sigblob.h"
  32 #include "signerutils.h"
  33 #include <security_utilities/unix++.h>
  34 #include <security_utilities/cfutilities.h>
  35
  36 namespace Security {
  37 namespace CodeSigning {
  38
  39
  40 //
  41 // A CFMDiskRep represents a single code file on disk containing a CFM (PEF)
  42 // binary. It is considered self-contained, and does not depend on any other
  43 // files in the system (even if it may be part of a larger bundle etc.)
  44 //
  45 // CFM is considered a legacy format that is not generated by Apple, but still
  46 // supported for backward compatibility. This DiskRep supports writing signing
  47 // data into the executable, using a simple back-of-file frame. It does not
  48 // support embedded Info.plists or any other fancy stuff.
  49 //
  50 // This DiskRep does not support resource sealing.
  51 //
  52 class CFMDiskRep : public SingleDiskRep {
  53 public:
  54         CFMDiskRep(const char *path);
  55         ~CFMDiskRep();
  56
  57         CFDataRef component(CodeDirectory::SpecialSlot slot);
  58         size_t signingLimit();
  59         std::string format();
  60         void flush();
  61
  62         const Requirements *defaultRequirements(const Architecture *arch, const SigningContext &ctx);
  63         size_t pageSize(const SigningContext &ctx);
  64
  65         static bool candidate(UnixPlusPlus::FileDesc &fd); // could this reasonably be a CFM code?
  66
  67 public:
  68         //
  69         // Signing sticks this structure at the very end of the file
  70         //
  71         struct Sentinel {
  72                 Endian<uint32_t> magic;                         // EmbeddedSignatureBlob::magic()
  73                 Endian<uint32_t> offset;                        // file absolute offset of EmbeddedSignatureBlob
  74         };
  75
  76 public:
  77         DiskRep::Writer *writer();
  78         class Writer;
  79         friend class Writer;
  80
  81 protected:
  82         void readSigningData();                                 // read and cache signing data
  83
  84 private:
  85         bool mTriedRead;                                                // tried to get signing data
  86         size_t mSigningOffset;                                  // where we found the signing data
  87         EmbeddedSignatureBlob *mSigningData;    // cached signing data
  88 };
  89
  90
  91 //
  92 // The write side of a FileDiskRep
  93 //
  94 class CFMDiskRep::Writer : public DiskRep::Writer, private EmbeddedSignatureBlob::Maker {
  95         friend class CFMDiskRep;
  96 public:
  97         Writer(CFMDiskRep *r) : rep(r), mSigningData(NULL) { }
  98         ~Writer();
  99
 100         void component(CodeDirectory::SpecialSlot slot, CFDataRef data);
 101         virtual void flush();
 102
 103 protected:
 104         RefPointer<CFMDiskRep> rep;
 105         EmbeddedSignatureBlob *mSigningData;
 106 };
 107
 108
 109 } // end namespace CodeSigning
 110 } // end namespace Security
 111
 112 #endif // !_H_CFMDISKREP