OSX/libsecurity_codesigning/lib/reqreader.cpp

   1 /*
   2  * Copyright (c) 2007,2011 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 // reqreader - Requirement language (exprOp) reader/scanner
  26 //
  27 #include "reqreader.h"
  28 #include <Security/SecTrustSettingsPriv.h>
  29 #include <security_utilities/memutils.h>
  30
  31 #if TARGET_OS_OSX
  32 #include <security_cdsa_utilities/cssmdata.h>   // for hex encoding
  33 #endif
  34
  35 #include "csutilities.h"
  36
  37 namespace Security {
  38 namespace CodeSigning {
  39
  40
  41 //
  42 // Requirement::Reader
  43 //
  44 Requirement::Reader::Reader(const Requirement *req)
  45         : mReq(req), mPC(sizeof(Requirement))
  46 {
  47         assert(req);
  48         if (req->kind() != exprForm)
  49                 MacOSError::throwMe(errSecCSReqUnsupported);
  50 }
  51
  52
  53 //
  54 // Access helpers to retrieve various data types from the data stream
  55 //
  56 void Requirement::Reader::getData(const void *&data, size_t &length)
  57 {
  58         length = get<uint32_t>();
  59         checkSize(length);
  60         data = (mReq->at<void>(mPC));
  61         mPC += LowLevelMemoryUtilities::alignUp(length, baseAlignment);
  62 }
  63
  64 string Requirement::Reader::getString()
  65 {
  66         const char *s; size_t length;
  67         getData(s, length);
  68         return string(s, length);
  69 }
  70
  71 CFDataRef Requirement::Reader::getHash()
  72 {
  73         const unsigned char *s; size_t length;
  74         getData(s, length);
  75         return makeCFData(s, length);
  76 }
  77
  78 CFAbsoluteTime Requirement::Reader::getAbsoluteTime()
  79 {
  80         // timestamps are saved as 64bit ints internally for
  81         // portability, but CoreFoundation wants CFAbsoluteTimes,
  82         // which are doubles.
  83         // This cuts off subseconds.
  84         return static_cast<CFAbsoluteTime>(get<int64_t>());
  85 }
  86
  87 const unsigned char *Requirement::Reader::getSHA1()
  88 {
  89         const unsigned char *digest; size_t length;
  90         getData(digest, length);
  91         if (length != CC_SHA1_DIGEST_LENGTH)
  92                 MacOSError::throwMe(errSecCSReqInvalid);
  93         return digest;
  94 }
  95
  96 void Requirement::Reader::skip(size_t length)
  97 {
  98         checkSize(length);
  99         mPC += length;
 100 }
 101
 102
 103 }       // CodeSigning
 104 }       // Security