libsecurity_codesigning/lib/cdbuilder.h

   1 /*
   2  * Copyright (c) 2006-2010 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 // cdbuilder - constructor for CodeDirectories
  26 //
  27 #ifndef _H_CDBUILDER
  28 #define _H_CDBUILDER
  29
  30 #include "codedirectory.h"
  31
  32
  33 namespace Security {
  34 namespace CodeSigning {
  35
  36
  37 //
  38 // Builder can construct CodeDirectories from pieces:
  39 //      Builder builder(...);
  40 //      builder.variousSetters(withSuitableData);
  41 //  CodeDirectory *result = builder.build();
  42 // Builder is not reusable.
  43 //
  44 class CodeDirectory::Builder {
  45 public:
  46         Builder(HashAlgorithm digestAlgorithm);
  47         ~Builder();
  48
  49         void executable(string path, size_t pagesize, size_t offset, size_t length);
  50         void reopen(string path, size_t offset, size_t length);
  51
  52         void specialSlot(SpecialSlot slot, CFDataRef data);
  53         void identifier(const std::string &code) { mIdentifier = code; }
  54         void flags(uint32_t f) { mFlags = f; }
  55
  56         Scatter *scatter(unsigned count);                       // allocate that many scatter elements (w/o sentinel)
  57         Scatter *scatter() { return mScatter; }         // return already allocated scatter vector
  58
  59         size_t size();                                                          // calculate size
  60         CodeDirectory *build();                                         // build CodeDirectory and return it
  61
  62 private:
  63         DynamicHash *getHash() const { return CodeDirectory::hashFor(this->mHashType); }
  64
  65         Hashing::Byte *specialSlot(SpecialSlot slot)
  66                 { assert(slot > 0 && slot <= cdSlotMax); return mSpecial + (slot - 1) * mDigestLength; }
  67         Hashing::Byte *specialSlot(SpecialSlot slot) const
  68                 { assert(slot > 0 && slot <= cdSlotMax); return mSpecial + (slot - 1) * mDigestLength; }
  69
  70 private:
  71         Hashing::Byte *mSpecial;                                        // array of special slot hashes
  72         UnixPlusPlus::AutoFileDesc mExec;                       // main executable file
  73         size_t mExecOffset;                                                     // starting offset in mExec
  74         size_t mExecLength;                                                     // total bytes of file to sign
  75         size_t mPageSize;                                                       // page size of executable (bytes)
  76         uint32_t mFlags;                                                        // CodeDirectory flags
  77         uint32_t mHashType;                                                     // digest algorithm code
  78         uint32_t mDigestLength;                                         // number of bytes in a single glue digest
  79         std::string mIdentifier;                                        // canonical identifier
  80
  81         size_t mSpecialSlots;                                           // highest special slot set
  82         size_t mCodeSlots;                                                      // number of code pages (slots)
  83
  84         Scatter *mScatter;                                                      // scatter vector
  85         size_t mScatterSize;                                            // number of scatter elements allocated (incl. sentinel)
  86
  87         CodeDirectory *mDir;                                            // what we're building
  88 };
  89
  90
  91 }       // CodeSigning
  92 }       // Security
  93
  94
  95 #endif //_H_CDBUILDER