Security/libsecurity_codesigning/lib/signer.cpp

   1 /*
   2  * Copyright (c) 2006-2014 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 // 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         // initialize progress/cancellation state
 125         code->prepareProgress(0);                       // totally fake workload - we don't know how many files we'll encounter
 126
 127         // get the Info.plist out of the rep for some creative defaulting
 128         CFRef<CFDictionaryRef> infoDict;
 129         if (CFRef<CFDataRef> infoData = rep->component(cdInfoSlot))
 130                 infoDict.take(makeCFDictionaryFrom(infoData));
 131
 132         uint32_t inherit = code->isSigned() ? state.mPreserveMetadata : 0;
 133
 134         // work out the canonical identifier
 135         identifier = state.mIdentifier;
 136         if (identifier.empty() && (inherit & kSecCodeSignerPreserveIdentifier))
 137                 identifier = code->identifier();
 138         if (identifier.empty()) {
 139                 identifier = rep->recommendedIdentifier(state);
 140                 if (identifier.find('.') == string::npos)
 141                         identifier = state.mIdentifierPrefix + identifier;
 142                 if (identifier.find('.') == string::npos && state.isAdhoc())
 143                         identifier = identifier + "-" + uniqueName();
 144                 secdebug("signer", "using default identifier=%s", identifier.c_str());
 145         } else
 146                 secdebug("signer", "using explicit identifier=%s", identifier.c_str());
 147
 148         teamID = state.mTeamID;
 149         if (teamID.empty() && (inherit & kSecCodeSignerPreserveTeamIdentifier)) {
 150                 const char *c_id = code->teamID();
 151                 if (c_id)
 152                         teamID = c_id;
 153         }
 154
 155         entitlements = state.mEntitlementData;
 156         if (!entitlements && (inherit & kSecCodeSignerPreserveEntitlements))
 157                 entitlements = code->component(cdEntitlementSlot);
 158
 159         // work out the CodeDirectory flags word
 160         bool haveCdFlags = false;
 161         if (!haveCdFlags && state.mCdFlagsGiven) {
 162                 cdFlags = state.mCdFlags;
 163                 secdebug("signer", "using explicit cdFlags=0x%x", cdFlags);
 164                 haveCdFlags = true;
 165         }
 166         if (!haveCdFlags) {
 167                 cdFlags = 0;
 168                 if (infoDict)
 169                         if (CFTypeRef csflags = CFDictionaryGetValue(infoDict, CFSTR("CSFlags"))) {
 170                                 if (CFGetTypeID(csflags) == CFNumberGetTypeID()) {
 171                                         cdFlags = cfNumber<uint32_t>(CFNumberRef(csflags));
 172                                         secdebug("signer", "using numeric cdFlags=0x%x from Info.plist", cdFlags);
 173                                 } else if (CFGetTypeID(csflags) == CFStringGetTypeID()) {
 174                                         cdFlags = cdTextFlags(cfString(CFStringRef(csflags)));
 175                                         secdebug("signer", "using text cdFlags=0x%x from Info.plist", cdFlags);
 176                                 } else
 177                                         MacOSError::throwMe(errSecCSBadDictionaryFormat);
 178                                 haveCdFlags = true;
 179                         }
 180         }
 181         if (!haveCdFlags && (inherit & kSecCodeSignerPreserveFlags)) {
 182                 cdFlags = code->codeDirectory(false)->flags & ~kSecCodeSignatureAdhoc;
 183                 secdebug("signer", "using inherited cdFlags=0x%x", cdFlags);
 184                 haveCdFlags = true;
 185         }
 186         if (!haveCdFlags)
 187                 cdFlags = 0;
 188         if (state.mSigner == SecIdentityRef(kCFNull))   // ad-hoc signing requested...
 189                 cdFlags |= kSecCodeSignatureAdhoc;      // ... so note that
 190
 191         // prepare the internal requirements input
 192         if (state.mRequirements) {
 193                 if (CFGetTypeID(state.mRequirements) == CFDataGetTypeID()) {            // binary form
 194                         const Requirements *rp = (const Requirements *)CFDataGetBytePtr(state.mRequirements.as<CFDataRef>());
 195                         if (!rp->validateBlob())
 196                                 MacOSError::throwMe(errSecCSReqInvalid);
 197                         requirements = rp->clone();
 198                 } else if (CFGetTypeID(state.mRequirements) == CFStringGetTypeID()) { // text form
 199                         CFRef<CFMutableStringRef> reqText = CFStringCreateMutableCopy(NULL, 0, state.mRequirements.as<CFStringRef>());
 200                         // substitute $ variable tokens
 201                         CFRange range = { 0, CFStringGetLength(reqText) };
 202                         CFStringFindAndReplace(reqText, CFSTR("$self.identifier"), CFTempString(identifier), range, 0);
 203                         requirements = parseRequirements(cfString(reqText));
 204                 } else
 205                         MacOSError::throwMe(errSecCSInvalidObjectRef);
 206         } else if (inherit & kSecCodeSignerPreserveRequirements)
 207                 if (const Requirements *rp = code->internalRequirements())
 208                         requirements = rp->clone();
 209
 210         // prepare the resource directory, if any
 211         string rpath = rep->resourcesRootPath();
 212         if (!rpath.empty()) {
 213                 // explicitly given resource rules always win
 214                 CFCopyRef<CFDictionaryRef> resourceRules = state.mResourceRules;
 215
 216                 // inherited rules come next (overriding embedded ones!)
 217                 if (!resourceRules && (inherit & kSecCodeSignerPreserveResourceRules))
 218                         if (CFDictionaryRef oldRules = code->resourceDictionary(false))
 219                                 resourceRules = oldRules;
 220
 221                 // embedded resource rules come next
 222                 if (!resourceRules && infoDict)
 223                         if (CFTypeRef spec = CFDictionaryGetValue(infoDict, _kCFBundleResourceSpecificationKey)) {
 224                                 if (CFGetTypeID(spec) == CFStringGetTypeID())
 225                                         if (CFRef<CFDataRef> data = cfLoadFile(rpath + "/" + cfString(CFStringRef(spec))))
 226                                                 if (CFDictionaryRef dict = makeCFDictionaryFrom(data))
 227                                                         resourceRules.take(dict);
 228                                 if (!resourceRules)     // embedded rules present but unacceptable
 229                                         MacOSError::throwMe(errSecCSResourceRulesInvalid);
 230                         }
 231
 232                 // if we got one from anywhere (but the defaults), sanity-check it
 233                 if (resourceRules) {
 234                         CFTypeRef rules = CFDictionaryGetValue(resourceRules, CFSTR("rules"));
 235                         if (!rules || CFGetTypeID(rules) != CFDictionaryGetTypeID())
 236                                 MacOSError::throwMe(errSecCSResourceRulesInvalid);
 237                 }
 238
 239                 // finally, ask the DiskRep for its default
 240                 if (!resourceRules)
 241                         resourceRules.take(rep->defaultResourceRules(state));
 242
 243                 // resource root can optionally be the canonical bundle path,
 244                 // but sealed resource paths are always relative to rpath
 245                 string root = rpath;
 246                 if (state.signingFlags() & kSecCSSignBundleRoot)
 247                         root = cfStringRelease(rep->copyCanonicalPath());
 248
 249                 // build the resource directory
 250                 buildResources(root, rpath, resourceRules);
 251         }
 252
 253         // screen and set the signing time
 254         CFAbsoluteTime now = CFAbsoluteTimeGetCurrent();
 255         if (state.mSigningTime == CFDateRef(kCFNull)) {
 256                 signingTime = 0;                // no time at all
 257         } else if (!state.mSigningTime) {
 258                 signingTime = now;              // default
 259         } else {
 260                 CFAbsoluteTime time = CFDateGetAbsoluteTime(state.mSigningTime);
 261                 if (time > now) // not allowed to post-date a signature
 262                         MacOSError::throwMe(errSecCSBadDictionaryFormat);
 263                 signingTime = time;
 264         }
 265
 266         pagesize = state.mPageSize ? cfNumber<size_t>(state.mPageSize) : rep->pageSize(state);
 267
 268     // Timestamping setup
 269     CFRef<SecIdentityRef> mTSAuth;      // identity for client-side authentication to the Timestamp server
 270 }
 271
 272
 273 //
 274 // Collect the resource seal for a program.
 275 // This includes both sealed resources and information about nested code.
 276 //
 277 void SecCodeSigner::Signer::buildResources(std::string root, std::string relBase, CFDictionaryRef rulesDict)
 278 {
 279         typedef ResourceBuilder::Rule Rule;
 280
 281         secdebug("codesign", "start building resource directory");
 282         __block CFRef<CFMutableDictionaryRef> result = makeCFMutableDictionary();
 283
 284         CFDictionaryRef rules = cfget<CFDictionaryRef>(rulesDict, "rules");
 285         assert(rules);
 286
 287         CFDictionaryRef files2 = NULL;
 288         if (!(state.signingFlags() & kSecCSSignV1)) {
 289                 CFCopyRef<CFDictionaryRef> rules2 = cfget<CFDictionaryRef>(rulesDict, "rules2");
 290                 if (!rules2) {
 291                         // Clone V1 rules and add default nesting rules at weight 0 (overridden by anything in rules).
 292                         // V1 rules typically do not cover these places so we'll prevail, but if they do, we defer to them.
 293                         rules2 = cfmake<CFDictionaryRef>("{+%O"
 294                                 "'^(Frameworks|SharedFrameworks|PlugIns|Plug-ins|XPCServices|Helpers|MacOS|Library/(Automator|Spotlight|LoginItems))/' = {nested=#T, weight=0}" // exclude dynamic repositories
 295                         "}", rules);
 296                 }
 297                 // build the modern (V2) resource seal
 298                 __block CFRef<CFMutableDictionaryRef> files = makeCFMutableDictionary();
 299                 ResourceBuilder resourceBuilder(root, relBase, rules2, digestAlgorithm(), strict, MacOSErrorSet());
 300                 ResourceBuilder &resources = resourceBuilder;   // (into block)
 301                 rep->adjustResources(resources);
 302                 resources.scan(^(FTSENT *ent, uint32_t ruleFlags, const char *relpath, Rule *rule) {
 303                         CFRef<CFMutableDictionaryRef> seal;
 304                         if (ruleFlags & ResourceBuilder::nested) {
 305                                 seal.take(signNested(ent, relpath));
 306                         } else if (ent->fts_info == FTS_SL) {
 307                                 char target[PATH_MAX];
 308                                 ssize_t len = ::readlink(ent->fts_accpath, target, sizeof(target)-1);
 309                                 if (len < 0)
 310                                         UnixError::check(-1);
 311                                 target[len] = '\0';
 312                                 seal.take(cfmake<CFMutableDictionaryRef>("{symlink=%s}", target));
 313                         } else {
 314                                 seal.take(cfmake<CFMutableDictionaryRef>("{hash=%O}",
 315                                         CFRef<CFDataRef>(resources.hashFile(ent->fts_accpath)).get()));
 316                         }
 317                         if (ruleFlags & ResourceBuilder::optional)
 318                                 CFDictionaryAddValue(seal, CFSTR("optional"), kCFBooleanTrue);
 319                         CFTypeRef hash;
 320                         if ((hash = CFDictionaryGetValue(seal, CFSTR("hash"))) && CFDictionaryGetCount(seal) == 1) // simple form
 321                                 CFDictionaryAddValue(files, CFTempString(relpath).get(), hash);
 322                         else
 323                                 CFDictionaryAddValue(files, CFTempString(relpath).get(), seal.get());
 324                         code->reportProgress();
 325                 });
 326                 CFDictionaryAddValue(result, CFSTR("rules2"), resourceBuilder.rules());
 327                 files2 = files;
 328                 CFDictionaryAddValue(result, CFSTR("files2"), files2);
 329         }
 330
 331         CFDictionaryAddValue(result, CFSTR("rules"), rules);    // preserve V1 rules in any case
 332         if (!(state.signingFlags() & kSecCSSignNoV1)) {
 333                 // build the legacy (V1) resource seal
 334                 __block CFRef<CFMutableDictionaryRef> files = makeCFMutableDictionary();
 335                 ResourceBuilder resourceBuilder(root, relBase, rules, digestAlgorithm(), strict, MacOSErrorSet());
 336                 ResourceBuilder &resources = resourceBuilder;
 337                 rep->adjustResources(resources);        // DiskRep-specific adjustments
 338                 resources.scan(^(FTSENT *ent, uint32_t ruleFlags, const char *relpath, Rule *rule) {
 339                         if (ent->fts_info == FTS_F) {
 340                                 CFRef<CFDataRef> hash;
 341                                 if (files2)     // try to get the hash from a previously-made version
 342                                         if (CFTypeRef seal = CFDictionaryGetValue(files2, CFTempString(relpath))) {
 343                                                 if (CFGetTypeID(seal) == CFDataGetTypeID())
 344                                                         hash = CFDataRef(seal);
 345                                                 else
 346                                                         hash = CFDataRef(CFDictionaryGetValue(CFDictionaryRef(seal), CFSTR("hash")));
 347                                         }
 348                                 if (!hash)
 349                                         hash.take(resources.hashFile(ent->fts_accpath));
 350                                 if (ruleFlags == 0) {   // default case - plain hash
 351                                         cfadd(files, "{%s=%O}", relpath, hash.get());
 352                                         secdebug("csresource", "%s added simple (rule %p)", relpath, rule);
 353                                 } else {        // more complicated - use a sub-dictionary
 354                                         cfadd(files, "{%s={hash=%O,optional=%B}}",
 355                                                 relpath, hash.get(), ruleFlags & ResourceBuilder::optional);
 356                                         secdebug("csresource", "%s added complex (rule %p)", relpath, rule);
 357                                 }
 358                         }
 359                 });
 360                 CFDictionaryAddValue(result, CFSTR("files"), files.get());
 361         }
 362
 363         resourceDirectory = result.get();
 364         resourceDictData.take(makeCFData(resourceDirectory.get()));
 365 }
 366
 367
 368 //
 369 // Deal with one piece of nested code
 370 //
 371 CFMutableDictionaryRef SecCodeSigner::Signer::signNested(FTSENT *ent, const char *relpath)
 372 {
 373         // sign nested code and collect nesting information
 374         try {
 375                 SecPointer<SecStaticCode> code = new SecStaticCode(DiskRep::bestGuess(ent->fts_path));
 376                 if (state.signingFlags() & kSecCSSignNestedCode)
 377                         this->state.sign(code, state.signingFlags());
 378                 std::string dr = Dumper::dump(code->designatedRequirement());
 379                 return cfmake<CFMutableDictionaryRef>("{requirement=%s,cdhash=%O}",
 380                         Dumper::dump(code->designatedRequirement()).c_str(),
 381                         code->cdHash());
 382         } catch (const CommonError &err) {
 383                 CSError::throwMe(err.osStatus(), kSecCFErrorPath, CFTempURL(relpath, false, this->code->resourceBase()));
 384         }
 385 }
 386
 387
 388 //
 389 // Sign a Mach-O binary, using liberal dollops of that special Mach-O magic sauce.
 390 // Note that this will deal just fine with non-fat Mach-O binaries, but it will
 391 // treat them as architectural binaries containing (only) one architecture - that
 392 // interpretation is courtesy of the Universal/MachO support classes.
 393 //
 394 void SecCodeSigner::Signer::signMachO(Universal *fat, const Requirement::Context &context)
 395 {
 396         // Mach-O executable at the core - perform multi-architecture signing
 397         auto_ptr<ArchEditor> editor(state.mDetached
 398                 ? static_cast<ArchEditor *>(new BlobEditor(*fat, *this))
 399                 : new MachOEditor(rep->writer(), *fat, this->digestAlgorithm(), rep->mainExecutablePath()));
 400         assert(editor->count() > 0);
 401         if (!editor->attribute(writerNoGlobal)) // can store architecture-common components
 402                 populate(*editor);
 403
 404         // pass 1: prepare signature blobs and calculate sizes
 405         for (MachOEditor::Iterator it = editor->begin(); it != editor->end(); ++it) {
 406                 MachOEditor::Arch &arch = *it->second;
 407                 arch.source.reset(fat->architecture(it->first));
 408
 409                 // library validation is not compatible with i386
 410                 if (arch.architecture.cpuType() == CPU_TYPE_I386) {
 411                         if (cdFlags & kSecCodeSignatureLibraryValidation) {
 412                                 MacOSError::throwMe(errSecCSBadLVArch);
 413                         }
 414                 }
 415
 416                 arch.ireqs(requirements, rep->defaultRequirements(&arch.architecture, state), context);
 417                 if (editor->attribute(writerNoGlobal))  // can't store globally, add per-arch
 418                         populate(arch);
 419                 populate(arch.cdbuilder, arch, arch.ireqs,
 420                         arch.source->offset(), arch.source->signingExtent());
 421
 422                 // add identification blob (made from this architecture) only if we're making a detached signature
 423                 if (state.mDetached) {
 424                         CFRef<CFDataRef> identification = MachORep::identificationFor(arch.source.get());
 425                         arch.add(cdIdentificationSlot, BlobWrapper::alloc(
 426                                 CFDataGetBytePtr(identification), CFDataGetLength(identification)));
 427                 }
 428
 429                 // prepare SuperBlob size estimate
 430                 size_t cdSize = arch.cdbuilder.size(CodeDirectory::currentVersion);
 431                 arch.blobSize = arch.size(cdSize, state.mCMSSize, 0);
 432         }
 433
 434         editor->allocate();
 435
 436         // pass 2: Finish and generate signatures, and write them
 437         for (MachOEditor::Iterator it = editor->begin(); it != editor->end(); ++it) {
 438                 MachOEditor::Arch &arch = *it->second;
 439                 editor->reset(arch);
 440
 441                 // finish CodeDirectory (off new binary) and sign it
 442                 CodeDirectory *cd = arch.cdbuilder.build();
 443                 CFRef<CFDataRef> signature = signCodeDirectory(cd);
 444
 445                 // complete the SuperBlob
 446                 arch.add(cdCodeDirectorySlot, cd);      // takes ownership
 447                 arch.add(cdSignatureSlot, BlobWrapper::alloc(
 448                         CFDataGetBytePtr(signature), CFDataGetLength(signature)));
 449                 if (!state.mDryRun) {
 450                         EmbeddedSignatureBlob *blob = arch.make();
 451                         editor->write(arch, blob);      // takes ownership of blob
 452                 }
 453         }
 454
 455         // done: write edit copy back over the original
 456         if (!state.mDryRun)
 457                 editor->commit();
 458 }
 459
 460
 461 //
 462 // Sign a binary that has no notion of architecture.
 463 // That currently means anything that isn't Mach-O format.
 464 //
 465 void SecCodeSigner::Signer::signArchitectureAgnostic(const Requirement::Context &context)
 466 {
 467         // non-Mach-O executable - single-instance signing
 468         RefPointer<DiskRep::Writer> writer = state.mDetached ?
 469                 (new DetachedBlobWriter(*this)) : rep->writer();
 470         CodeDirectory::Builder builder(state.mDigestAlgorithm);
 471         InternalRequirements ireqs;
 472         ireqs(requirements, rep->defaultRequirements(NULL, state), context);
 473         populate(*writer);
 474         populate(builder, *writer, ireqs, rep->signingBase(), rep->signingLimit());
 475
 476         // add identification blob (made from this architecture) only if we're making a detached signature
 477         if (state.mDetached) {
 478                 CFRef<CFDataRef> identification = rep->identification();
 479                 writer->component(cdIdentificationSlot, identification);
 480         }
 481
 482         CodeDirectory *cd = builder.build();
 483         CFRef<CFDataRef> signature = signCodeDirectory(cd);
 484         if (!state.mDryRun) {
 485                 writer->codeDirectory(cd);
 486                 writer->signature(signature);
 487                 writer->flush();
 488         }
 489         ::free(cd);
 490 }
 491
 492
 493 //
 494 // Global populate - send components to destination buffers ONCE
 495 //
 496 void SecCodeSigner::Signer::populate(DiskRep::Writer &writer)
 497 {
 498         if (resourceDirectory && !state.mDryRun)
 499                 writer.component(cdResourceDirSlot, resourceDictData);
 500 }
 501
 502
 503 //
 504 // Per-architecture populate - send components to per-architecture buffers
 505 // and populate the CodeDirectory for an architecture. In architecture-agnostic
 506 // signing operations, the non-architectural binary is considered one (arbitrary) architecture
 507 // for the purposes of this call.
 508 //
 509 void SecCodeSigner::Signer::populate(CodeDirectory::Builder &builder, DiskRep::Writer &writer,
 510         InternalRequirements &ireqs, size_t offset /* = 0 */, size_t length /* = 0 */)
 511 {
 512         // fill the CodeDirectory
 513         builder.executable(rep->mainExecutablePath(), pagesize, offset, length);
 514         builder.flags(cdFlags);
 515         builder.identifier(identifier);
 516         builder.teamID(teamID);
 517
 518         if (CFRef<CFDataRef> data = rep->component(cdInfoSlot))
 519                 builder.specialSlot(cdInfoSlot, data);
 520         if (ireqs) {
 521                 CFRef<CFDataRef> data = makeCFData(*ireqs);
 522                 writer.component(cdRequirementsSlot, data);
 523                 builder.specialSlot(cdRequirementsSlot, data);
 524         }
 525         if (resourceDirectory)
 526                 builder.specialSlot(cdResourceDirSlot, resourceDictData);
 527 #if NOT_YET
 528         if (state.mApplicationData)
 529                 builder.specialSlot(cdApplicationSlot, state.mApplicationData);
 530 #endif
 531         if (entitlements) {
 532                 writer.component(cdEntitlementSlot, entitlements);
 533                 builder.specialSlot(cdEntitlementSlot, entitlements);
 534         }
 535
 536         writer.addDiscretionary(builder);
 537 }
 538
 539 #include <security_smime/tsaSupport.h>
 540
 541 //
 542 // Generate the CMS signature for a (finished) CodeDirectory.
 543 //
 544 CFDataRef SecCodeSigner::Signer::signCodeDirectory(const CodeDirectory *cd)
 545 {
 546         assert(state.mSigner);
 547         CFRef<CFMutableDictionaryRef> defaultTSContext = NULL;
 548
 549         // a null signer generates a null signature blob
 550         if (state.mSigner == SecIdentityRef(kCFNull))
 551                 return CFDataCreate(NULL, NULL, 0);
 552
 553         // generate CMS signature
 554         CFRef<CMSEncoderRef> cms;
 555         MacOSError::check(CMSEncoderCreate(&cms.aref()));
 556         MacOSError::check(CMSEncoderSetCertificateChainMode(cms, kCMSCertificateChainWithRoot));
 557         CMSEncoderAddSigners(cms, state.mSigner);
 558         MacOSError::check(CMSEncoderSetHasDetachedContent(cms, true));
 559
 560         if (signingTime) {
 561                 MacOSError::check(CMSEncoderAddSignedAttributes(cms, kCMSAttrSigningTime));
 562                 MacOSError::check(CMSEncoderSetSigningTime(cms, signingTime));
 563         }
 564
 565         MacOSError::check(CMSEncoderUpdateContent(cms, cd, cd->length()));
 566
 567     // Set up to call Timestamp server if requested
 568
 569     if (state.mWantTimeStamp)
 570     {
 571         CFRef<CFErrorRef> error = NULL;
 572         defaultTSContext = SecCmsTSAGetDefaultContext(&error.aref());
 573         if (error)
 574             MacOSError::throwMe(errSecDataNotAvailable);
 575
 576         if (state.mNoTimeStampCerts || state.mTimestampService) {
 577             if (state.mTimestampService)
 578                 CFDictionarySetValue(defaultTSContext, kTSAContextKeyURL, state.mTimestampService);
 579             if (state.mNoTimeStampCerts)
 580                 CFDictionarySetValue(defaultTSContext, kTSAContextKeyNoCerts, kCFBooleanTrue);
 581        }
 582
 583         CmsMessageSetTSAContext(cms, defaultTSContext);
 584     }
 585
 586         CFDataRef signature;
 587         MacOSError::check(CMSEncoderCopyEncodedContent(cms, &signature));
 588
 589         return signature;
 590 }
 591
 592
 593 //
 594 // Parse a text of the form
 595 //      flag,...,flag
 596 // where each flag is the canonical name of a signable CodeDirectory flag.
 597 // No abbreviations are allowed, and internally set flags are not accepted.
 598 //
 599 uint32_t SecCodeSigner::Signer::cdTextFlags(std::string text)
 600 {
 601         uint32_t flags = 0;
 602         for (string::size_type comma = text.find(','); ; text = text.substr(comma+1), comma = text.find(',')) {
 603                 string word = (comma == string::npos) ? text : text.substr(0, comma);
 604                 const SecCodeDirectoryFlagTable *item;
 605                 for (item = kSecCodeDirectoryFlagTable; item->name; item++)
 606                         if (item->signable && word == item->name) {
 607                                 flags |= item->value;
 608                                 break;
 609                         }
 610                 if (!item->name)        // not found
 611                         MacOSError::throwMe(errSecCSInvalidFlags);
 612                 if (comma == string::npos)      // last word
 613                         break;
 614         }
 615         return flags;
 616 }
 617
 618
 619 //
 620 // Generate a unique string from our underlying DiskRep.
 621 // We could get 90%+ of the uniquing benefit by just generating
 622 // a random string here. Instead, we pick the (hex string encoding of)
 623 // the source rep's unique identifier blob. For universal binaries,
 624 // this is the canonical local architecture, which is a bit arbitrary.
 625 // This provides us with a consistent unique string for all architectures
 626 // of a fat binary, *and* (unlike a random string) is reproducible
 627 // for identical inputs, even upon resigning.
 628 //
 629 std::string SecCodeSigner::Signer::uniqueName() const
 630 {
 631         CFRef<CFDataRef> identification = rep->identification();
 632         const UInt8 *ident = CFDataGetBytePtr(identification);
 633         const CFIndex length = CFDataGetLength(identification);
 634         string result;
 635         for (CFIndex n = 0; n < length; n++) {
 636                 char hex[3];
 637                 snprintf(hex, sizeof(hex), "%02x", ident[n]);
 638                 result += hex;
 639         }
 640         return result;
 641 }
 642
 643
 644 } // end namespace CodeSigning
 645 } // end namespace Security