lib/singlediskrep.cpp

   1 /*
   2  * Copyright (c) 2006-2007 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 // singlediskrep - semi-abstract diskrep for a single file of some kind
  26 //
  27 #include "singlediskrep.h"
  28 #include "csutilities.h"
  29 #include <security_utilities/cfutilities.h>
  30
  31 namespace Security {
  32 namespace CodeSigning {
  33
  34 using namespace UnixPlusPlus;
  35
  36
  37 //
  38 // Construct a SingleDiskRep
  39 //
  40 SingleDiskRep::SingleDiskRep(const std::string &path)
  41         : mPath(path)
  42 {
  43 }
  44
  45
  46 //
  47 // The default binary identification of a SingleDiskRep is the (SHA-1) hash
  48 // of the entire file itself.
  49 //
  50 CFDataRef SingleDiskRep::identification()
  51 {
  52         SHA1 hash;
  53         this->fd().seek(0);
  54         hashFileData(this->fd(), hash);
  55         SHA1::Digest digest;
  56         hash.finish(digest);
  57         return makeCFData(digest, sizeof(digest));
  58 }
  59
  60
  61 //
  62 // Both the canonical and main executable path of a SingleDiskRep is, well, its path.
  63 //
  64 CFURLRef SingleDiskRep::canonicalPath()
  65 {
  66         return makeCFURL(mPath);
  67 }
  68
  69 string SingleDiskRep::mainExecutablePath()
  70 {
  71         return mPath;
  72 }
  73
  74
  75 //
  76 // The recommended identifier of a SingleDiskRep is, absent any better clue,
  77 // the basename of its path.
  78 //
  79 string SingleDiskRep::recommendedIdentifier()
  80 {
  81         string::size_type p = mPath.rfind('/');
  82         if (p == string::npos)
  83                 return mPath;
  84         else
  85                 return mPath.substr(p+1);
  86 }
  87
  88
  89 //
  90 // The default signing limit is the size of the file.
  91 // This will do unless the signing data gets creatively stuck in there somewhere.
  92 //
  93 size_t SingleDiskRep::signingLimit()
  94 {
  95         return fd().fileSize();
  96 }
  97
  98
  99 //
 100 // A lazily opened read-only file descriptor for the path.
 101 //
 102 FileDesc &SingleDiskRep::fd()
 103 {
 104         if (!mFd)
 105                 mFd.open(mPath, O_RDONLY);
 106         return mFd;
 107 }
 108
 109
 110 //
 111 // Flush cached state
 112 //
 113 void SingleDiskRep::flush()
 114 {
 115         mFd.close();
 116 }
 117
 118
 119 //
 120 // Prototype Writers
 121 //
 122 FileDesc &SingleDiskRep::Writer::fd()
 123 {
 124         if (!mFd)
 125                 mFd.open(rep->path(), O_RDWR);
 126         return mFd;
 127 }
 128
 129
 130 } // end namespace CodeSigning
 131 } // end namespace Security