lib/CodeSigner.cpp

   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,
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  18  * Please see the License for the specific language governing rights and
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  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 //
  25 // CodeSigner - SecCodeSigner API objects
  26 //
  27 #include "CodeSigner.h"
  28 #include "signer.h"
  29 #include "reqparser.h"
  30 #include "renum.h"
  31 #include "csdatabase.h"
  32 #include <security_utilities/unix++.h>
  33 #include <security_utilities/unixchild.h>
  34 #include <vector>
  35
  36 namespace Security {
  37
  38 __SEC_CFTYPE(SecIdentity)
  39
  40 namespace CodeSigning {
  41
  42 using namespace UnixPlusPlus;
  43
  44
  45 //
  46 // A helper for parsing out a CFDictionary signing-data specification
  47 //
  48 class SecCodeSigner::Parser : CFDictionary {
  49 public:
  50         Parser(SecCodeSigner &signer, CFDictionaryRef parameters);
  51
  52         bool getBool(CFStringRef key) const
  53         {
  54                 if (CFBooleanRef flag = get<CFBooleanRef>(key))
  55                         return flag == kCFBooleanTrue;
  56                 else
  57                         return false;
  58         }
  59 };
  60
  61
  62 //
  63 // Construct a SecCodeSigner
  64 //
  65 SecCodeSigner::SecCodeSigner(SecCSFlags flags)
  66         : mOpFlags(flags), mRequirements(NULL), mDigestAlgorithm(kSecCodeSignatureDefaultDigestAlgorithm)
  67 {
  68 }
  69
  70
  71 //
  72 // Clean up a SecCodeSigner
  73 //
  74 SecCodeSigner::~SecCodeSigner() throw()
  75 try {
  76         ::free((Requirements *)mRequirements);
  77 } catch (...) {
  78         return;
  79 }
  80
  81
  82 //
  83 // Parse an input parameter dictionary and set ready-to-use parameters
  84 //
  85 void SecCodeSigner::parameters(CFDictionaryRef paramDict)
  86 {
  87         Parser(*this, paramDict);
  88         if (!valid())
  89                 MacOSError::throwMe(errSecCSInvalidObjectRef);
  90 }
  91
  92
  93 //
  94 // Roughly check for validity.
  95 // This isn't thorough; it just sees if if looks like we've set up the object appropriately.
  96 //
  97 bool SecCodeSigner::valid() const
  98 {
  99         if (mOpFlags & kSecCSRemoveSignature)
 100                 return true;
 101         return mSigner;
 102 }
 103
 104
 105 //
 106 // Sign code
 107 //
 108 void SecCodeSigner::sign(SecStaticCode *code, SecCSFlags flags)
 109 {
 110         Signer operation(*this, code);
 111         if ((flags | mOpFlags) & kSecCSRemoveSignature) {
 112                 secdebug("signer", "%p will remove signature from %p", this, code);
 113                 operation.remove(flags);
 114         } else {
 115                 if (!valid())
 116                         MacOSError::throwMe(errSecCSInvalidObjectRef);
 117                 secdebug("signer", "%p will sign %p (flags 0x%x)", this, code, flags);
 118                 operation.sign(flags);
 119         }
 120         code->resetValidity();
 121 }
 122
 123
 124 //
 125 // ReturnDetachedSignature is called by writers or editors that try to return
 126 // detached signature data (rather than annotate the target).
 127 //
 128 void SecCodeSigner::returnDetachedSignature(BlobCore *blob, Signer &signer)
 129 {
 130         assert(mDetached);
 131         if (CFGetTypeID(mDetached) == CFURLGetTypeID()) {
 132                 // URL to destination file
 133                 AutoFileDesc fd(cfString(CFURLRef(mDetached.get())), O_WRONLY | O_CREAT | O_TRUNC);
 134                 fd.writeAll(*blob);
 135         } else if (CFGetTypeID(mDetached) == CFDataGetTypeID()) {
 136                 CFDataAppendBytes(CFMutableDataRef(mDetached.get()),
 137                         (const UInt8 *)blob, blob->length());
 138         } else if (CFGetTypeID(mDetached) == CFNullGetTypeID()) {
 139                 signatureDatabaseWriter().storeCode(blob, signer.path().c_str());
 140         } else
 141                 assert(false);
 142 }
 143
 144
 145 //
 146 // Our DiskRep::signingContext methods communicate with the signing subsystem
 147 // in terms those callers can easily understand.
 148 //
 149 string SecCodeSigner::sdkPath(const std::string &path) const
 150 {
 151         assert(path[0] == '/'); // need absolute path here
 152         if (mSDKRoot)
 153                 return cfString(mSDKRoot) + path;
 154         else
 155                 return path;
 156 }
 157
 158 bool SecCodeSigner::isAdhoc() const
 159 {
 160         return mSigner == SecIdentityRef(kCFNull);
 161 }
 162
 163
 164 //
 165 // The actual parsing operation is done in the Parser class.
 166 //
 167 // Note that we need to copy or retain all incoming data. The caller has no requirement
 168 // to keep the parameters dictionary around.
 169 //
 170 SecCodeSigner::Parser::Parser(SecCodeSigner &state, CFDictionaryRef parameters)
 171         : CFDictionary(parameters, errSecCSBadDictionaryFormat)
 172 {
 173         // the signer may be an identity or null
 174         if (CFTypeRef signer = get<CFTypeRef>(kSecCodeSignerIdentity))
 175                 if (CFGetTypeID(signer) == SecIdentityGetTypeID() || signer == kCFNull)
 176                         state.mSigner = SecIdentityRef(signer);
 177                 else
 178                         MacOSError::throwMe(errSecCSInvalidObjectRef);
 179
 180         // the flags need some augmentation
 181         if (CFNumberRef flags = get<CFNumberRef>(kSecCodeSignerFlags)) {
 182                 state.mCdFlagsGiven = true;
 183                 state.mCdFlags = cfNumber<uint32_t>(flags);
 184         } else
 185                 state.mCdFlagsGiven = false;
 186
 187         // digest algorithms are specified as a numeric code
 188         if (CFNumberRef digestAlgorithm = get<CFNumberRef>(kSecCodeSignerDigestAlgorithm))
 189                 state.mDigestAlgorithm = cfNumber<long>(digestAlgorithm);
 190
 191         if (CFNumberRef cmsSize = get<CFNumberRef>(CFSTR("cmssize")))
 192                 state.mCMSSize = cfNumber<size_t>(cmsSize);
 193         else
 194                 state.mCMSSize = 5000;  // likely big enough
 195
 196         // signing time can be a CFDateRef or null
 197         if (CFTypeRef time = get<CFTypeRef>(kSecCodeSignerSigningTime))
 198                 if (CFGetTypeID(time) == CFDateGetTypeID() || time == kCFNull)
 199                         state.mSigningTime = CFDateRef(time);
 200                 else
 201                         MacOSError::throwMe(errSecCSInvalidObjectRef);
 202
 203         if (CFStringRef ident = get<CFStringRef>(kSecCodeSignerIdentifier))
 204                 state.mIdentifier = cfString(ident);
 205
 206         if (CFStringRef prefix = get<CFStringRef>(kSecCodeSignerIdentifierPrefix))
 207                 state.mIdentifierPrefix = cfString(prefix);
 208
 209         // requirements can be binary or string (to be compiled)
 210         if (CFTypeRef reqs = get<CFTypeRef>(kSecCodeSignerRequirements)) {
 211                 if (CFGetTypeID(reqs) == CFDataGetTypeID()) {           // binary form
 212                         const Requirements *rp = (const Requirements *)CFDataGetBytePtr(CFDataRef(reqs));
 213                         state.mRequirements = rp->clone();
 214                 } else if (CFGetTypeID(reqs) == CFStringGetTypeID()) { // text form
 215                         state.mRequirements = parseRequirements(cfString(CFStringRef(reqs)));
 216                 } else
 217                         MacOSError::throwMe(errSecCSInvalidObjectRef);
 218         } else
 219                 state.mRequirements = NULL;
 220
 221         state.mNoMachO = getBool(CFSTR("no-macho"));
 222
 223         state.mPageSize = get<CFNumberRef>(kSecCodeSignerPageSize);
 224
 225         // detached can be (destination) file URL or (mutable) Data to be appended-to
 226         if (state.mDetached = get<CFTypeRef>(kSecCodeSignerDetached)) {
 227                 CFTypeID type = CFGetTypeID(state.mDetached);
 228                 if (type != CFURLGetTypeID() && type != CFDataGetTypeID() && type != CFNullGetTypeID())
 229                         MacOSError::throwMe(errSecCSInvalidObjectRef);
 230         }
 231
 232         state.mDryRun = getBool(kSecCodeSignerDryRun);
 233
 234         state.mResourceRules = get<CFDictionaryRef>(kSecCodeSignerResourceRules);
 235
 236         state.mApplicationData = get<CFDataRef>(kSecCodeSignerApplicationData);
 237         state.mEntitlementData = get<CFDataRef>(kSecCodeSignerEntitlements);
 238
 239         state.mSDKRoot = get<CFURLRef>(kSecCodeSignerSDKRoot);
 240 }
 241
 242
 243 } // end namespace CodeSigning
 244 } // end namespace Security