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 #include <security_cdsa_utilities/cssmdata.h>   // for hex encoding
  31 #include "csutilities.h"
  32
  33 namespace Security {
  34 namespace CodeSigning {
  35
  36
  37 //
  38 // Requirement::Reader
  39 //
  40 Requirement::Reader::Reader(const Requirement *req)
  41         : mReq(req), mPC(sizeof(Requirement))
  42 {
  43         assert(req);
  44         if (req->kind() != exprForm)
  45                 MacOSError::throwMe(errSecCSReqUnsupported);
  46 }
  47
  48
  49 //
  50 // Access helpers to retrieve various data types from the data stream
  51 //
  52 void Requirement::Reader::getData(const void *&data, size_t &length)
  53 {
  54         length = get<uint32_t>();
  55         checkSize(length);
  56         data = (mReq->at<void>(mPC));
  57         mPC += LowLevelMemoryUtilities::alignUp(length, baseAlignment);
  58 }
  59
  60 string Requirement::Reader::getString()
  61 {
  62         const char *s; size_t length;
  63         getData(s, length);
  64         return string(s, length);
  65 }
  66
  67 CFDataRef Requirement::Reader::getHash()
  68 {
  69         const unsigned char *s; size_t length;
  70         getData(s, length);
  71         return makeCFData(s, length);
  72 }
  73
  74 const unsigned char *Requirement::Reader::getSHA1()
  75 {
  76         const unsigned char *digest; size_t length;
  77         getData(digest, length);
  78         if (length != CC_SHA1_DIGEST_LENGTH)
  79                 MacOSError::throwMe(errSecCSReqInvalid);
  80         return digest;
  81 }
  82
  83 void Requirement::Reader::skip(size_t length)
  84 {
  85         checkSize(length);
  86         mPC += length;
  87 }
  88
  89
  90 }       // CodeSigning
  91 }       // Security