libsecurity_codesigning/lib/signer.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,
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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 // signer - Signing operation supervisor and controller
  26 //
  27 #include "signer.h"
  28 #include "resources.h"
  29 #include "signerutils.h"
  30 #include "SecCodeSigner.h"
  31 #include <Security/SecIdentity.h>
  32 #include <Security/CMSEncoder.h>
  33 #include <Security/CMSPrivate.h>
  34 #include <Security/CSCommonPriv.h>
  35 #include <CoreFoundation/CFBundlePriv.h>
  36 #include "resources.h"
  37 #include "machorep.h"
  38 #include "reqparser.h"
  39 #include "reqdumper.h"
  40 #include "csutilities.h"
  41 #include <security_utilities/unix++.h>
  42 #include <security_utilities/unixchild.h>
  43 #include <security_utilities/cfmunge.h>
  44
  45 namespace Security {
  46 namespace CodeSigning {
  47
  48
  49 //
  50 // Sign some code.
  51 //
  52 void SecCodeSigner::Signer::sign(SecCSFlags flags)
  53 {
  54         rep = code->diskRep()->base();
  55         this->prepare(flags);
  56
  57         PreSigningContext context(*this);
  58
  59         /* If an explicit teamID was passed in it must be
  60          the same as what came from the cert */
  61         std::string teamIDFromCert = state.getTeamIDFromSigner(context.certs);
  62
  63         if (state.mPreserveMetadata & kSecCodeSignerPreserveTeamIdentifier) {
  64                 /* If preserving the team identifier, teamID is set previously when the
  65                  code object is still available */
  66                 if (!teamIDFromCert.empty() && teamID != teamIDFromCert)
  67                         MacOSError::throwMe(errSecCSInvalidFlags);
  68         } else {
  69                 if (teamIDFromCert.empty()) {
  70                         /* state.mTeamID is an explicitly passed teamID */
  71                         teamID = state.mTeamID;
  72                 } else if (state.mTeamID.empty() || (state.mTeamID == teamIDFromCert)) {
  73                         /* If there was no explicit team ID set, or the explicit team ID matches
  74                          what is in the cert, use the team ID from the certificate */
  75                         teamID = teamIDFromCert;
  76                 } else {
  77                         /* The caller passed in an explicit team ID that does not match what is
  78                          in the signing cert, which is an invalid usage */
  79                         MacOSError::throwMe(errSecCSInvalidFlags);
  80                 }
  81         }
  82
  83         if (Universal *fat = state.mNoMachO ? NULL : rep->mainExecutableImage()) {
  84                 signMachO(fat, context);
  85         } else {
  86                 signArchitectureAgnostic(context);
  87         }
  88 }
  89
  90
  91 //
  92 // Remove any existing code signature from code
  93 //
  94 void SecCodeSigner::Signer::remove(SecCSFlags flags)
  95 {
  96         // can't remove a detached signature
  97         if (state.mDetached)
  98                 MacOSError::throwMe(errSecCSNotSupported);
  99
 100         rep = code->diskRep();
 101         if (Universal *fat = state.mNoMachO ? NULL : rep->mainExecutableImage()) {
 102                 // architecture-sensitive removal
 103                 MachOEditor editor(rep->writer(), *fat, kSecCodeSignatureNoHash, rep->mainExecutablePath());
 104                 editor.allocate();              // create copy
 105                 editor.commit();                // commit change
 106         } else {
 107                 // architecture-agnostic removal
 108                 RefPointer<DiskRep::Writer> writer = rep->writer();
 109                 writer->remove();
 110                 writer->flush();
 111         }
 112 }
 113
 114
 115 //
 116 // Contemplate the object-to-be-signed and set up the Signer state accordingly.
 117 //
 118 void SecCodeSigner::Signer::prepare(SecCSFlags flags)
 119 {
 120         // make sure the rep passes strict validation
 121         if (strict)
 122                 rep->strictValidate(MacOSErrorSet());
 123
 124         // get the Info.plist out of the rep for some creative defaulting
 125         CFRef<CFDictionaryRef> infoDict;
 126         if (CFRef<CFDataRef> infoData = rep->component(cdInfoSlot))
 127                 infoDict.take(makeCFDictionaryFrom(infoData));
 128
 129         uint32_t inherit = code->isSigned() ? state.mPreserveMetadata : 0;
 130
 131         // work out the canonical identifier
 132         identifier = state.mIdentifier;
 133         if (identifier.empty() && (inherit & kSecCodeSignerPreserveIdentifier))
 134                 identifier = code->identifier();
 135         if (identifier.empty()) {
 136                 identifier = rep->recommendedIdentifier(state);
 137                 if (identifier.find('.') == string::npos)
 138                         identifier = state.mIdentifierPrefix + identifier;
 139                 if (identifier.find('.') == string::npos && state.isAdhoc())
 140                         identifier = identifier + "-" + uniqueName();
 141                 secdebug("signer", "using default identifier=%s", identifier.c_str());
 142         } else
 143                 secdebug("signer", "using explicit identifier=%s", identifier.c_str());
 144
 145         teamID = state.mTeamID;
 146         if (teamID.empty() && (inherit & kSecCodeSignerPreserveTeamIdentifier)) {
 147                 const char *c_id = code->teamID();
 148                 if (c_id)
 149                         teamID = c_id;
 150         }
 151
 152         entitlements = state.mEntitlementData;
 153         if (!entitlements && (inherit & kSecCodeSignerPreserveEntitlements))
 154                 entitlements = code->component(cdEntitlementSlot);
 155
 156         // work out the CodeDirectory flags word
 157         bool haveCdFlags = false;
 158         if (!haveCdFlags && state.mCdFlagsGiven) {
 159                 cdFlags = state.mCdFlags;
 160                 secdebug("signer", "using explicit cdFlags=0x%x", cdFlags);
 161                 haveCdFlags = true;
 162         }
 163         if (!haveCdFlags) {
 164                 cdFlags = 0;
 165                 if (infoDict)
 166                         if (CFTypeRef csflags = CFDictionaryGetValue(infoDict, CFSTR("CSFlags"))) {
 167                                 if (CFGetTypeID(csflags) == CFNumberGetTypeID()) {
 168                                         cdFlags = cfNumber<uint32_t>(CFNumberRef(csflags));
 169                                         secdebug("signer", "using numeric cdFlags=0x%x from Info.plist", cdFlags);
 170                                 } else if (CFGetTypeID(csflags) == CFStringGetTypeID()) {
 171                                         cdFlags = cdTextFlags(cfString(CFStringRef(csflags)));
 172                                         secdebug("signer", "using text cdFlags=0x%x from Info.plist", cdFlags);
 173                                 } else
 174                                         MacOSError::throwMe(errSecCSBadDictionaryFormat);
 175                                 haveCdFlags = true;
 176                         }
 177         }
 178         if (!haveCdFlags && (inherit & kSecCodeSignerPreserveFlags)) {
 179                 cdFlags = code->codeDirectory(false)->flags & ~kSecCodeSignatureAdhoc;
 180                 secdebug("signer", "using inherited cdFlags=0x%x", cdFlags);
 181                 haveCdFlags = true;
 182         }
 183         if (!haveCdFlags)
 184                 cdFlags = 0;
 185         if (state.mSigner == SecIdentityRef(kCFNull))   // ad-hoc signing requested...
 186                 cdFlags |= kSecCodeSignatureAdhoc;      // ... so note that
 187
 188         // prepare the internal requirements input
 189         if (state.mRequirements) {
 190                 if (CFGetTypeID(state.mRequirements) == CFDataGetTypeID()) {            // binary form
 191                         const Requirements *rp = (const Requirements *)CFDataGetBytePtr(state.mRequirements.as<CFDataRef>());
 192                         if (!rp->validateBlob())
 193                                 MacOSError::throwMe(errSecCSReqInvalid);
 194                         requirements = rp->clone();
 195                 } else if (CFGetTypeID(state.mRequirements) == CFStringGetTypeID()) { // text form
 196                         CFRef<CFMutableStringRef> reqText = CFStringCreateMutableCopy(NULL, 0, state.mRequirements.as<CFStringRef>());
 197                         // substitute $ variable tokens
 198                         CFRange range = { 0, CFStringGetLength(reqText) };
 199                         CFStringFindAndReplace(reqText, CFSTR("$self.identifier"), CFTempString(identifier), range, 0);
 200                         requirements = parseRequirements(cfString(reqText));
 201                 } else
 202                         MacOSError::throwMe(errSecCSInvalidObjectRef);
 203         } else if (inherit & kSecCodeSignerPreserveRequirements)
 204                 if (const Requirements *rp = code->internalRequirements())
 205                         requirements = rp->clone();
 206
 207         // prepare the resource directory, if any
 208         string rpath = rep->resourcesRootPath();
 209         if (!rpath.empty()) {
 210                 // explicitly given resource rules always win
 211                 CFCopyRef<CFDictionaryRef> resourceRules = state.mResourceRules;
 212
 213                 // inherited rules come next (overriding embedded ones!)
 214                 if (!resourceRules && (inherit & kSecCodeSignerPreserveResourceRules))
 215                         if (CFDictionaryRef oldRules = code->resourceDictionary(false))
 216                                 resourceRules = oldRules;
 217
 218                 // embedded resource rules come next
 219                 if (!resourceRules && infoDict)
 220                         if (CFTypeRef spec = CFDictionaryGetValue(infoDict, _kCFBundleResourceSpecificationKey)) {
 221                                 if (CFGetTypeID(spec) == CFStringGetTypeID())
 222                                         if (CFRef<CFDataRef> data = cfLoadFile(rpath + "/" + cfString(CFStringRef(spec))))
 223                                                 if (CFDictionaryRef dict = makeCFDictionaryFrom(data))
 224                                                         resourceRules.take(dict);
 225                                 if (!resourceRules)     // embedded rules present but unacceptable
 226                                         MacOSError::throwMe(errSecCSResourceRulesInvalid);
 227                         }
 228
 229                 // if we got one from anywhere (but the defaults), sanity-check it
 230                 if (resourceRules) {
 231                         CFTypeRef rules = CFDictionaryGetValue(resourceRules, CFSTR("rules"));
 232                         if (!rules || CFGetTypeID(rules) != CFDictionaryGetTypeID())
 233                                 MacOSError::throwMe(errSecCSResourceRulesInvalid);
 234                 }
 235
 236                 // finally, ask the DiskRep for its default
 237                 if (!resourceRules)
 238                         resourceRules.take(rep->defaultResourceRules(state));
 239
 240                 // resource root can optionally be the canonical bundle path,
 241                 // but sealed resource paths are always relative to rpath
 242                 string root = rpath;
 243                 if (state.signingFlags() & kSecCSSignBundleRoot)
 244                         root = cfStringRelease(rep->copyCanonicalPath());
 245
 246                 // build the resource directory
 247                 buildResources(root, rpath, resourceRules);
 248         }
 249
 250         // screen and set the signing time
 251         CFAbsoluteTime now = CFAbsoluteTimeGetCurrent();
 252         if (state.mSigningTime == CFDateRef(kCFNull)) {
 253                 signingTime = 0;                // no time at all
 254         } else if (!state.mSigningTime) {
 255                 signingTime = now;              // default
 256         } else {
 257                 CFAbsoluteTime time = CFDateGetAbsoluteTime(state.mSigningTime);
 258                 if (time > now) // not allowed to post-date a signature
 259                         MacOSError::throwMe(errSecCSBadDictionaryFormat);
 260                 signingTime = time;
 261         }
 262
 263         pagesize = state.mPageSize ? cfNumber<size_t>(state.mPageSize) : rep->pageSize(state);
 264
 265     // Timestamping setup
 266     CFRef<SecIdentityRef> mTSAuth;      // identity for client-side authentication to the Timestamp server
 267 }
 268
 269
 270 //
 271 // Collect the resource seal for a program.
 272 // This includes both sealed resources and information about nested code.
 273 //
 274 void SecCodeSigner::Signer::buildResources(std::string root, std::string relBase, CFDictionaryRef rulesDict)
 275 {
 276         typedef ResourceBuilder::Rule Rule;
 277
 278         secdebug("codesign", "start building resource directory");
 279         __block CFRef<CFMutableDictionaryRef> result = makeCFMutableDictionary();
 280
 281         CFDictionaryRef rules = cfget<CFDictionaryRef>(rulesDict, "rules");
 282         assert(rules);
 283
 284         CFDictionaryRef files2 = NULL;
 285         if (!(state.signingFlags() & kSecCSSignV1)) {
 286                 CFCopyRef<CFDictionaryRef> rules2 = cfget<CFDictionaryRef>(rulesDict, "rules2");
 287                 if (!rules2) {
 288                         // Clone V1 rules and add default nesting rules at weight 0 (overridden by anything in rules).
 289                         // V1 rules typically do not cover these places so we'll prevail, but if they do, we defer to them.
 290                         rules2 = cfmake<CFDictionaryRef>("{+%O"
 291                                 "'^[^/]+$' = {top=#T, weight=0}"                        // files directly in Contents
 292                                 "'^(Frameworks|SharedFrameworks|Plugins|Plug-ins|XPCServices|Helpers|MacOS)/' = {nested=#T, weight=0}" // exclude dynamic repositories
 293                         "}", rules);
 294                 }
 295                 // build the modern (V2) resource seal
 296                 __block CFRef<CFMutableDictionaryRef> files = makeCFMutableDictionary();
 297                 ResourceBuilder resourceBuilder(root, relBase, rules2, digestAlgorithm(), strict, MacOSErrorSet());
 298                 ResourceBuilder &resources = resourceBuilder;   // (into block)
 299                 rep->adjustResources(resources);
 300                 resources.scan(^(FTSENT *ent, uint32_t ruleFlags, const char *relpath, Rule *rule) {
 301                         CFRef<CFMutableDictionaryRef> seal;
 302                         if (ruleFlags & ResourceBuilder::nested) {
 303                                 seal.take(signNested(ent, relpath));
 304                         } else if (ent->fts_info == FTS_SL) {
 305                                 char target[PATH_MAX];
 306                                 ssize_t len = ::readlink(ent->fts_accpath, target, sizeof(target)-1);
 307                                 if (len < 0)
 308                                         UnixError::check(-1);
 309                                 target[len] = '\0';
 310                                 seal.take(cfmake<CFMutableDictionaryRef>("{symlink=%s}", target));
 311                         } else {
 312                                 seal.take(cfmake<CFMutableDictionaryRef>("{hash=%O}",
 313                                         CFRef<CFDataRef>(resources.hashFile(ent->fts_accpath)).get()));
 314                         }
 315                         if (ruleFlags & ResourceBuilder::optional)
 316                                 CFDictionaryAddValue(seal, CFSTR("optional"), kCFBooleanTrue);
 317                         CFTypeRef hash;
 318                         if ((hash = CFDictionaryGetValue(seal, CFSTR("hash"))) && CFDictionaryGetCount(seal) == 1) // simple form
 319                                 CFDictionaryAddValue(files, CFTempString(relpath).get(), hash);
 320                         else
 321                                 CFDictionaryAddValue(files, CFTempString(relpath).get(), seal.get());
 322                 });
 323                 CFDictionaryAddValue(result, CFSTR("rules2"), resourceBuilder.rules());
 324                 files2 = files;
 325                 CFDictionaryAddValue(result, CFSTR("files2"), files2);
 326         }
 327
 328         CFDictionaryAddValue(result, CFSTR("rules"), rules);    // preserve V1 rules in any case
 329         if (!(state.signingFlags() & kSecCSSignNoV1)) {
 330                 // build the legacy (V1) resource seal
 331                 __block CFRef<CFMutableDictionaryRef> files = makeCFMutableDictionary();
 332                 ResourceBuilder resourceBuilder(root, relBase, rules, digestAlgorithm(), strict, MacOSErrorSet());
 333                 ResourceBuilder &resources = resourceBuilder;
 334                 rep->adjustResources(resources);        // DiskRep-specific adjustments
 335                 resources.scan(^(FTSENT *ent, uint32_t ruleFlags, const char *relpath, Rule *rule) {
 336                         if (ent->fts_info == FTS_F) {
 337                                 CFRef<CFDataRef> hash;
 338                                 if (files2)     // try to get the hash from a previously-made version
 339                                         if (CFTypeRef seal = CFDictionaryGetValue(files2, CFTempString(relpath))) {
 340                                                 if (CFGetTypeID(seal) == CFDataGetTypeID())
 341                                                         hash = CFDataRef(seal);
 342                                                 else
 343                                                         hash = CFDataRef(CFDictionaryGetValue(CFDictionaryRef(seal), CFSTR("hash")));
 344                                         }
 345                                 if (!hash)
 346                                         hash.take(resources.hashFile(ent->fts_accpath));
 347                                 if (ruleFlags == 0) {   // default case - plain hash
 348                                         cfadd(files, "{%s=%O}", relpath, hash.get());
 349                                         secdebug("csresource", "%s added simple (rule %p)", relpath, rule);
 350                                 } else {        // more complicated - use a sub-dictionary
 351                                         cfadd(files, "{%s={hash=%O,optional=%B}}",
 352                                                 relpath, hash.get(), ruleFlags & ResourceBuilder::optional);
 353                                         secdebug("csresource", "%s added complex (rule %p)", relpath, rule);
 354                                 }
 355                         }
 356                 });
 357                 CFDictionaryAddValue(result, CFSTR("files"), files.get());
 358         }
 359
 360         resourceDirectory = result.get();
 361         resourceDictData.take(makeCFData(resourceDirectory.get()));
 362 }
 363
 364
 365 //
 366 // Deal with one piece of nested code
 367 //
 368 CFMutableDictionaryRef SecCodeSigner::Signer::signNested(FTSENT *ent, const char *relpath)
 369 {
 370         // sign nested code and collect nesting information
 371         try {
 372                 SecPointer<SecStaticCode> code = new SecStaticCode(DiskRep::bestGuess(ent->fts_path));
 373                 if (state.signingFlags() & kSecCSSignNestedCode)
 374                         this->state.sign(code, state.signingFlags());
 375                 std::string dr = Dumper::dump(code->designatedRequirement());
 376                 return cfmake<CFMutableDictionaryRef>("{requirement=%s,cdhash=%O}",
 377                         Dumper::dump(code->designatedRequirement()).c_str(),
 378                         code->cdHash());
 379         } catch (const CommonError &err) {
 380                 CSError::throwMe(err.osStatus(), kSecCFErrorPath, CFTempURL(relpath, false, this->code->resourceBase()));
 381         }
 382 }
 383
 384
 385 //
 386 // Sign a Mach-O binary, using liberal dollops of that special Mach-O magic sauce.
 387 // Note that this will deal just fine with non-fat Mach-O binaries, but it will
 388 // treat them as architectural binaries containing (only) one architecture - that
 389 // interpretation is courtesy of the Universal/MachO support classes.
 390 //
 391 void SecCodeSigner::Signer::signMachO(Universal *fat, const Requirement::Context &context)
 392 {
 393         // Mach-O executable at the core - perform multi-architecture signing
 394         auto_ptr<ArchEditor> editor(state.mDetached
 395                 ? static_cast<ArchEditor *>(new BlobEditor(*fat, *this))
 396                 : new MachOEditor(rep->writer(), *fat, this->digestAlgorithm(), rep->mainExecutablePath()));
 397         assert(editor->count() > 0);
 398         if (!editor->attribute(writerNoGlobal)) // can store architecture-common components
 399                 populate(*editor);
 400
 401         // pass 1: prepare signature blobs and calculate sizes
 402         for (MachOEditor::Iterator it = editor->begin(); it != editor->end(); ++it) {
 403                 MachOEditor::Arch &arch = *it->second;
 404                 arch.source.reset(fat->architecture(it->first));
 405                 arch.ireqs(requirements, rep->defaultRequirements(&arch.architecture, state), context);
 406                 if (editor->attribute(writerNoGlobal))  // can't store globally, add per-arch
 407                         populate(arch);
 408                 populate(arch.cdbuilder, arch, arch.ireqs,
 409                         arch.source->offset(), arch.source->signingExtent());
 410
 411                 // add identification blob (made from this architecture) only if we're making a detached signature
 412                 if (state.mDetached) {
 413                         CFRef<CFDataRef> identification = MachORep::identificationFor(arch.source.get());
 414                         arch.add(cdIdentificationSlot, BlobWrapper::alloc(
 415                                 CFDataGetBytePtr(identification), CFDataGetLength(identification)));
 416                 }
 417
 418                 // prepare SuperBlob size estimate
 419                 size_t cdSize = arch.cdbuilder.size(CodeDirectory::currentVersion);
 420                 arch.blobSize = arch.size(cdSize, state.mCMSSize, 0);
 421         }
 422
 423         editor->allocate();
 424
 425         // pass 2: Finish and generate signatures, and write them
 426         for (MachOEditor::Iterator it = editor->begin(); it != editor->end(); ++it) {
 427                 MachOEditor::Arch &arch = *it->second;
 428                 editor->reset(arch);
 429
 430                 // finish CodeDirectory (off new binary) and sign it
 431                 CodeDirectory *cd = arch.cdbuilder.build();
 432                 CFRef<CFDataRef> signature = signCodeDirectory(cd);
 433
 434                 // complete the SuperBlob
 435                 arch.add(cdCodeDirectorySlot, cd);      // takes ownership
 436                 arch.add(cdSignatureSlot, BlobWrapper::alloc(
 437                         CFDataGetBytePtr(signature), CFDataGetLength(signature)));
 438                 if (!state.mDryRun) {
 439                         EmbeddedSignatureBlob *blob = arch.make();
 440                         editor->write(arch, blob);      // takes ownership of blob
 441                 }
 442         }
 443
 444         // done: write edit copy back over the original
 445         if (!state.mDryRun)
 446                 editor->commit();
 447 }
 448
 449
 450 //
 451 // Sign a binary that has no notion of architecture.
 452 // That currently means anything that isn't Mach-O format.
 453 //
 454 void SecCodeSigner::Signer::signArchitectureAgnostic(const Requirement::Context &context)
 455 {
 456         // non-Mach-O executable - single-instance signing
 457         RefPointer<DiskRep::Writer> writer = state.mDetached ?
 458                 (new DetachedBlobWriter(*this)) : rep->writer();
 459         CodeDirectory::Builder builder(state.mDigestAlgorithm);
 460         InternalRequirements ireqs;
 461         ireqs(requirements, rep->defaultRequirements(NULL, state), context);
 462         populate(*writer);
 463         populate(builder, *writer, ireqs, rep->signingBase(), rep->signingLimit());
 464
 465         // add identification blob (made from this architecture) only if we're making a detached signature
 466         if (state.mDetached) {
 467                 CFRef<CFDataRef> identification = rep->identification();
 468                 writer->component(cdIdentificationSlot, identification);
 469         }
 470
 471         CodeDirectory *cd = builder.build();
 472         CFRef<CFDataRef> signature = signCodeDirectory(cd);
 473         if (!state.mDryRun) {
 474                 writer->codeDirectory(cd);
 475                 writer->signature(signature);
 476                 writer->flush();
 477         }
 478         ::free(cd);
 479 }
 480
 481
 482 //
 483 // Global populate - send components to destination buffers ONCE
 484 //
 485 void SecCodeSigner::Signer::populate(DiskRep::Writer &writer)
 486 {
 487         if (resourceDirectory && !state.mDryRun)
 488                 writer.component(cdResourceDirSlot, resourceDictData);
 489 }
 490
 491
 492 //
 493 // Per-architecture populate - send components to per-architecture buffers
 494 // and populate the CodeDirectory for an architecture. In architecture-agnostic
 495 // signing operations, the non-architectural binary is considered one (arbitrary) architecture
 496 // for the purposes of this call.
 497 //
 498 void SecCodeSigner::Signer::populate(CodeDirectory::Builder &builder, DiskRep::Writer &writer,
 499         InternalRequirements &ireqs, size_t offset /* = 0 */, size_t length /* = 0 */)
 500 {
 501         // fill the CodeDirectory
 502         builder.executable(rep->mainExecutablePath(), pagesize, offset, length);
 503         builder.flags(cdFlags);
 504         builder.identifier(identifier);
 505         builder.teamID(teamID);
 506
 507         if (CFRef<CFDataRef> data = rep->component(cdInfoSlot))
 508                 builder.specialSlot(cdInfoSlot, data);
 509         if (ireqs) {
 510                 CFRef<CFDataRef> data = makeCFData(*ireqs);
 511                 writer.component(cdRequirementsSlot, data);
 512                 builder.specialSlot(cdRequirementsSlot, data);
 513         }
 514         if (resourceDirectory)
 515                 builder.specialSlot(cdResourceDirSlot, resourceDictData);
 516 #if NOT_YET
 517         if (state.mApplicationData)
 518                 builder.specialSlot(cdApplicationSlot, state.mApplicationData);
 519 #endif
 520         if (entitlements) {
 521                 writer.component(cdEntitlementSlot, entitlements);
 522                 builder.specialSlot(cdEntitlementSlot, entitlements);
 523         }
 524
 525         writer.addDiscretionary(builder);
 526 }
 527
 528 #include <security_smime/tsaSupport.h>
 529
 530 //
 531 // Generate the CMS signature for a (finished) CodeDirectory.
 532 //
 533 CFDataRef SecCodeSigner::Signer::signCodeDirectory(const CodeDirectory *cd)
 534 {
 535         assert(state.mSigner);
 536         CFRef<CFMutableDictionaryRef> defaultTSContext = NULL;
 537
 538         // a null signer generates a null signature blob
 539         if (state.mSigner == SecIdentityRef(kCFNull))
 540                 return CFDataCreate(NULL, NULL, 0);
 541
 542         // generate CMS signature
 543         CFRef<CMSEncoderRef> cms;
 544         MacOSError::check(CMSEncoderCreate(&cms.aref()));
 545         MacOSError::check(CMSEncoderSetCertificateChainMode(cms, kCMSCertificateChainWithRoot));
 546         CMSEncoderAddSigners(cms, state.mSigner);
 547         MacOSError::check(CMSEncoderSetHasDetachedContent(cms, true));
 548
 549         if (signingTime) {
 550                 MacOSError::check(CMSEncoderAddSignedAttributes(cms, kCMSAttrSigningTime));
 551                 MacOSError::check(CMSEncoderSetSigningTime(cms, signingTime));
 552         }
 553
 554         MacOSError::check(CMSEncoderUpdateContent(cms, cd, cd->length()));
 555
 556     // Set up to call Timestamp server if requested
 557
 558     if (state.mWantTimeStamp)
 559     {
 560         CFRef<CFErrorRef> error = NULL;
 561         defaultTSContext = SecCmsTSAGetDefaultContext(&error.aref());
 562         if (error)
 563             MacOSError::throwMe(errSecDataNotAvailable);
 564
 565         if (state.mNoTimeStampCerts || state.mTimestampService) {
 566             if (state.mTimestampService)
 567                 CFDictionarySetValue(defaultTSContext, kTSAContextKeyURL, state.mTimestampService);
 568             if (state.mNoTimeStampCerts)
 569                 CFDictionarySetValue(defaultTSContext, kTSAContextKeyNoCerts, kCFBooleanTrue);
 570        }
 571
 572         CmsMessageSetTSAContext(cms, defaultTSContext);
 573     }
 574
 575         CFDataRef signature;
 576         MacOSError::check(CMSEncoderCopyEncodedContent(cms, &signature));
 577
 578         return signature;
 579 }
 580
 581
 582 //
 583 // Parse a text of the form
 584 //      flag,...,flag
 585 // where each flag is the canonical name of a signable CodeDirectory flag.
 586 // No abbreviations are allowed, and internally set flags are not accepted.
 587 //
 588 uint32_t SecCodeSigner::Signer::cdTextFlags(std::string text)
 589 {
 590         uint32_t flags = 0;
 591         for (string::size_type comma = text.find(','); ; text = text.substr(comma+1), comma = text.find(',')) {
 592                 string word = (comma == string::npos) ? text : text.substr(0, comma);
 593                 const SecCodeDirectoryFlagTable *item;
 594                 for (item = kSecCodeDirectoryFlagTable; item->name; item++)
 595                         if (item->signable && word == item->name) {
 596                                 flags |= item->value;
 597                                 break;
 598                         }
 599                 if (!item->name)        // not found
 600                         MacOSError::throwMe(errSecCSInvalidFlags);
 601                 if (comma == string::npos)      // last word
 602                         break;
 603         }
 604         return flags;
 605 }
 606
 607
 608 //
 609 // Generate a unique string from our underlying DiskRep.
 610 // We could get 90%+ of the uniquing benefit by just generating
 611 // a random string here. Instead, we pick the (hex string encoding of)
 612 // the source rep's unique identifier blob. For universal binaries,
 613 // this is the canonical local architecture, which is a bit arbitrary.
 614 // This provides us with a consistent unique string for all architectures
 615 // of a fat binary, *and* (unlike a random string) is reproducible
 616 // for identical inputs, even upon resigning.
 617 //
 618 std::string SecCodeSigner::Signer::uniqueName() const
 619 {
 620         CFRef<CFDataRef> identification = rep->identification();
 621         const UInt8 *ident = CFDataGetBytePtr(identification);
 622         const CFIndex length = CFDataGetLength(identification);
 623         string result;
 624         for (CFIndex n = 0; n < length; n++) {
 625                 char hex[3];
 626                 snprintf(hex, sizeof(hex), "%02x", ident[n]);
 627                 result += hex;
 628         }
 629         return result;
 630 }
 631
 632
 633 } // end namespace CodeSigning
 634 } // end namespace Security