libsecurity_codesigning/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,
  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 // CodeSigner - SecCodeSigner API objects
  26 //
  27 #include "CodeSigner.h"
  28 #include "signer.h"
  29 #include "csdatabase.h"
  30 #include "drmaker.h"
  31 #include "csutilities.h"
  32 #include <security_utilities/unix++.h>
  33 #include <security_utilities/unixchild.h>
  34 #include <Security/SecCertificate.h>
  35 #include <Security/SecCertificatePriv.h>
  36 #include <vector>
  37
  38 namespace Security {
  39
  40 __SEC_CFTYPE(SecIdentity)
  41
  42 namespace CodeSigning {
  43
  44 using namespace UnixPlusPlus;
  45
  46
  47 //
  48 // A helper for parsing out a CFDictionary signing-data specification
  49 //
  50 class SecCodeSigner::Parser : CFDictionary {
  51 public:
  52         Parser(SecCodeSigner &signer, CFDictionaryRef parameters);
  53
  54         bool getBool(CFStringRef key) const
  55         {
  56                 if (CFBooleanRef flag = get<CFBooleanRef>(key))
  57                         return flag == kCFBooleanTrue;
  58                 else
  59                         return false;
  60         }
  61 };
  62
  63
  64 //
  65 // Construct a SecCodeSigner
  66 //
  67 SecCodeSigner::SecCodeSigner(SecCSFlags flags)
  68         : mOpFlags(flags), mDigestAlgorithm(kSecCodeSignatureDefaultDigestAlgorithm)
  69 {
  70 }
  71
  72
  73 //
  74 // Clean up a SecCodeSigner
  75 //
  76 SecCodeSigner::~SecCodeSigner() throw()
  77 try {
  78 } catch (...) {
  79         return;
  80 }
  81
  82
  83 //
  84 // Parse an input parameter dictionary and set ready-to-use parameters
  85 //
  86 void SecCodeSigner::parameters(CFDictionaryRef paramDict)
  87 {
  88         Parser(*this, paramDict);
  89         if (!valid())
  90                 MacOSError::throwMe(errSecCSInvalidObjectRef);
  91 }
  92
  93 //
  94 // Retrieve the team ID from the signing certificate if and only if
  95 // it is an apple developer signing cert
  96 //
  97 std::string SecCodeSigner::getTeamIDFromSigner(CFArrayRef certs)
  98 {
  99         if (mSigner && mSigner != SecIdentityRef(kCFNull)) {
 100                 CFRef<SecCertificateRef> signerCert;
 101                 MacOSError::check(SecIdentityCopyCertificate(mSigner, &signerCert.aref()));
 102
 103                 /* Make sure the certificate looks like an Apple certificate, because we do not
 104                         extract the team ID from a non Apple certificate */
 105                 if (SecStaticCode::isAppleDeveloperCert(certs)) {
 106                         CFRef<CFStringRef> teamIDFromCert;
 107
 108                         MacOSError::check(SecCertificateCopySubjectComponent(signerCert.get(), &CSSMOID_OrganizationalUnitName, &teamIDFromCert.aref()));
 109
 110                         if (teamIDFromCert)
 111                                 return cfString(teamIDFromCert);
 112                 }
 113         }
 114
 115         return "";
 116 }
 117
 118 //
 119 // Roughly check for validity.
 120 // This isn't thorough; it just sees if if looks like we've set up the object appropriately.
 121 //
 122 bool SecCodeSigner::valid() const
 123 {
 124         if (mOpFlags & kSecCSRemoveSignature)
 125                 return true;
 126         return mSigner;
 127 }
 128
 129
 130 //
 131 // Sign code
 132 //
 133 void SecCodeSigner::sign(SecStaticCode *code, SecCSFlags flags)
 134 {
 135         if (code->isSigned() && (flags & kSecCSSignPreserveSignature))
 136                 return;
 137         Signer operation(*this, code);
 138         if ((flags | mOpFlags) & kSecCSRemoveSignature) {
 139                 secdebug("signer", "%p will remove signature from %p", this, code);
 140                 operation.remove(flags);
 141         } else {
 142                 if (!valid())
 143                         MacOSError::throwMe(errSecCSInvalidObjectRef);
 144                 secdebug("signer", "%p will sign %p (flags 0x%x)", this, code, flags);
 145                 operation.sign(flags);
 146         }
 147         code->resetValidity();
 148 }
 149
 150
 151 //
 152 // ReturnDetachedSignature is called by writers or editors that try to return
 153 // detached signature data (rather than annotate the target).
 154 //
 155 void SecCodeSigner::returnDetachedSignature(BlobCore *blob, Signer &signer)
 156 {
 157         assert(mDetached);
 158         if (CFGetTypeID(mDetached) == CFURLGetTypeID()) {
 159                 // URL to destination file
 160                 AutoFileDesc fd(cfString(CFURLRef(mDetached.get())), O_WRONLY | O_CREAT | O_TRUNC);
 161                 fd.writeAll(*blob);
 162         } else if (CFGetTypeID(mDetached) == CFDataGetTypeID()) {
 163                 CFDataAppendBytes(CFMutableDataRef(mDetached.get()),
 164                         (const UInt8 *)blob, blob->length());
 165         } else if (CFGetTypeID(mDetached) == CFNullGetTypeID()) {
 166                 SignatureDatabaseWriter db;
 167                 db.storeCode(blob, signer.path().c_str());
 168         } else
 169                 assert(false);
 170 }
 171
 172
 173 //
 174 // Our DiskRep::signingContext methods communicate with the signing subsystem
 175 // in terms those callers can easily understand.
 176 //
 177 string SecCodeSigner::sdkPath(const std::string &path) const
 178 {
 179         assert(path[0] == '/'); // need absolute path here
 180         if (mSDKRoot)
 181                 return cfString(mSDKRoot) + path;
 182         else
 183                 return path;
 184 }
 185
 186 bool SecCodeSigner::isAdhoc() const
 187 {
 188         return mSigner == SecIdentityRef(kCFNull);
 189 }
 190
 191 SecCSFlags SecCodeSigner::signingFlags() const
 192 {
 193         return mOpFlags;
 194 }
 195
 196
 197 //
 198 // The actual parsing operation is done in the Parser class.
 199 //
 200 // Note that we need to copy or retain all incoming data. The caller has no requirement
 201 // to keep the parameters dictionary around.
 202 //
 203 SecCodeSigner::Parser::Parser(SecCodeSigner &state, CFDictionaryRef parameters)
 204         : CFDictionary(parameters, errSecCSBadDictionaryFormat)
 205 {
 206         // the signer may be an identity or null
 207         state.mSigner = SecIdentityRef(get<CFTypeRef>(kSecCodeSignerIdentity));
 208         if (state.mSigner)
 209                 if (CFGetTypeID(state.mSigner) != SecIdentityGetTypeID() && !CFEqual(state.mSigner, kCFNull))
 210                         MacOSError::throwMe(errSecCSInvalidObjectRef);
 211
 212         // the flags need some augmentation
 213         if (CFNumberRef flags = get<CFNumberRef>(kSecCodeSignerFlags)) {
 214                 state.mCdFlagsGiven = true;
 215                 state.mCdFlags = cfNumber<uint32_t>(flags);
 216         } else
 217                 state.mCdFlagsGiven = false;
 218
 219         // digest algorithms are specified as a numeric code
 220         if (CFNumberRef digestAlgorithm = get<CFNumberRef>(kSecCodeSignerDigestAlgorithm))
 221                 state.mDigestAlgorithm = cfNumber<unsigned int>(digestAlgorithm);
 222
 223         if (CFNumberRef cmsSize = get<CFNumberRef>(CFSTR("cmssize")))
 224                 state.mCMSSize = cfNumber<size_t>(cmsSize);
 225         else
 226                 state.mCMSSize = 9000;  // likely big enough
 227
 228         // metadata preservation options
 229         if (CFNumberRef preserve = get<CFNumberRef>(kSecCodeSignerPreserveMetadata)) {
 230                 state.mPreserveMetadata = cfNumber<uint32_t>(preserve);
 231         } else
 232                 state.mPreserveMetadata = 0;
 233
 234
 235         // signing time can be a CFDateRef or null
 236         if (CFTypeRef time = get<CFTypeRef>(kSecCodeSignerSigningTime)) {
 237                 if (CFGetTypeID(time) == CFDateGetTypeID() || time == kCFNull)
 238                         state.mSigningTime = CFDateRef(time);
 239                 else
 240                         MacOSError::throwMe(errSecCSInvalidObjectRef);
 241         }
 242
 243         if (CFStringRef ident = get<CFStringRef>(kSecCodeSignerIdentifier))
 244                 state.mIdentifier = cfString(ident);
 245
 246         if (CFStringRef teamid = get<CFStringRef>(kSecCodeSignerTeamIdentifier))
 247                 state.mTeamID = cfString(teamid);
 248
 249         if (CFStringRef prefix = get<CFStringRef>(kSecCodeSignerIdentifierPrefix))
 250                 state.mIdentifierPrefix = cfString(prefix);
 251
 252         // Requirements can be binary or string (to be compiled).
 253         // We must pass them along to the signer for possible text substitution
 254         if (CFTypeRef reqs = get<CFTypeRef>(kSecCodeSignerRequirements)) {
 255                 if (CFGetTypeID(reqs) == CFDataGetTypeID() || CFGetTypeID(reqs) == CFStringGetTypeID())
 256                         state.mRequirements = reqs;
 257                 else
 258                         MacOSError::throwMe(errSecCSInvalidObjectRef);
 259         } else
 260                 state.mRequirements = NULL;
 261
 262         state.mNoMachO = getBool(CFSTR("no-macho"));
 263
 264         state.mPageSize = get<CFNumberRef>(kSecCodeSignerPageSize);
 265
 266         // detached can be (destination) file URL or (mutable) Data to be appended-to
 267         if ((state.mDetached = get<CFTypeRef>(kSecCodeSignerDetached))) {
 268                 CFTypeID type = CFGetTypeID(state.mDetached);
 269                 if (type != CFURLGetTypeID() && type != CFDataGetTypeID() && type != CFNullGetTypeID())
 270                         MacOSError::throwMe(errSecCSInvalidObjectRef);
 271         }
 272
 273         state.mDryRun = getBool(kSecCodeSignerDryRun);
 274
 275         state.mResourceRules = get<CFDictionaryRef>(kSecCodeSignerResourceRules);
 276
 277         state.mApplicationData = get<CFDataRef>(kSecCodeSignerApplicationData);
 278         state.mEntitlementData = get<CFDataRef>(kSecCodeSignerEntitlements);
 279
 280         state.mSDKRoot = get<CFURLRef>(kSecCodeSignerSDKRoot);
 281
 282         if (CFBooleanRef timestampRequest = get<CFBooleanRef>(kSecCodeSignerRequireTimestamp)) {
 283                 state.mWantTimeStamp = timestampRequest == kCFBooleanTrue;
 284         } else {        // pick default
 285                 state.mWantTimeStamp = false;
 286                 if (state.mSigner && state.mSigner != SecIdentityRef(kCFNull)) {
 287                         CFRef<SecCertificateRef> signerCert;
 288                         MacOSError::check(SecIdentityCopyCertificate(state.mSigner, &signerCert.aref()));
 289                         if (certificateHasField(signerCert, devIdLeafMarkerOID))
 290                                 state.mWantTimeStamp = true;
 291                 }
 292         }
 293         state.mTimestampAuthentication = get<SecIdentityRef>(kSecCodeSignerTimestampAuthentication);
 294         state.mTimestampService = get<CFURLRef>(kSecCodeSignerTimestampServer);
 295         state.mNoTimeStampCerts = getBool(kSecCodeSignerTimestampOmitCertificates);
 296 }
 297
 298
 299 } // end namespace CodeSigning
 300 } // end namespace Security