OSX/libsecurity_codesigning/lib/reqinterp.cpp

   1 /*
   2  * Copyright (c) 2006,2011-2014 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 // reqinterp - Requirement language (exprOp) interpreter
  26 //
  27 #include "reqinterp.h"
  28 #include "codesigning_dtrace.h"
  29 #include <Security/SecTrustSettingsPriv.h>
  30 #include <Security/SecCertificatePriv.h>
  31 #include <security_utilities/memutils.h>
  32 #include <security_utilities/logging.h>
  33 #include <sys/csr.h>
  34 #include <IOKit/IOKitLib.h>
  35 #include <IOKit/IOCFUnserialize.h>
  36 #include "csutilities.h"
  37
  38 namespace Security {
  39 namespace CodeSigning {
  40
  41
  42 //
  43 // Fragment fetching, caching, and evaluation.
  44 //
  45 // Several language elements allow "calling" of separate requirement programs
  46 // stored on disk as (binary) requirement blobs. The Fragments class takes care
  47 // of finding, loading, caching, and evaluating them.
  48 //
  49 // This is a singleton for (process global) caching. It works fine as multiple instances,
  50 // at a loss of caching effectiveness.
  51 //
  52 class Fragments {
  53 public:
  54         Fragments();
  55
  56         bool named(const std::string &name, const Requirement::Context &ctx)
  57                 { return evalNamed("subreq", name, ctx); }
  58         bool namedAnchor(const std::string &name, const Requirement::Context &ctx)
  59                 { return evalNamed("anchorreq", name, ctx); }
  60
  61 private:
  62         bool evalNamed(const char *type, const std::string &name, const Requirement::Context &ctx);
  63         CFDataRef fragment(const char *type, const std::string &name);
  64
  65         typedef std::map<std::string, CFRef<CFDataRef> > FragMap;
  66
  67 private:
  68         CFBundleRef mMyBundle;                  // Security.framework bundle
  69         Mutex mLock;                                    // lock for all of the below...
  70         FragMap mFragments;                             // cached fragments
  71 };
  72
  73 static ModuleNexus<Fragments> fragments;
  74
  75
  76 //
  77 // Magic certificate features
  78 //
  79 static CFStringRef appleIntermediateCN = CFSTR("Apple Code Signing Certification Authority");
  80 static CFStringRef appleIntermediateO = CFSTR("Apple Inc.");
  81
  82
  83 //
  84 // Main interpreter function.
  85 //
  86 // ExprOp code is in Polish Notation (operator followed by operands),
  87 // and this engine uses opportunistic evaluation.
  88 //
  89 bool Requirement::Interpreter::evaluate()
  90 { return eval(stackLimit); }
  91
  92 bool Requirement::Interpreter::eval(int depth)
  93 {
  94         if (--depth <= 0)               // nested too deeply - protect the stack
  95                 MacOSError::throwMe(errSecCSReqInvalid);
  96
  97         ExprOp op = ExprOp(get<uint32_t>());
  98         CODESIGN_EVAL_REQINT_OP(op, this->pc() - sizeof(uint32_t));
  99         switch (op & ~opFlagMask) {
 100         case opFalse:
 101                 return false;
 102         case opTrue:
 103                 return true;
 104         case opIdent:
 105                 return mContext->directory && getString() == mContext->directory->identifier();
 106         case opAppleAnchor:
 107                 return appleSigned();
 108         case opAppleGenericAnchor:
 109                 return appleAnchored();
 110         case opAnchorHash:
 111                 {
 112                         SecCertificateRef cert = mContext->cert(get<int32_t>());
 113                         return verifyAnchor(cert, getSHA1());
 114                 }
 115         case opInfoKeyValue:    // [legacy; use opInfoKeyField]
 116                 {
 117                         string key = getString();
 118                         return infoKeyValue(key, Match(CFTempString(getString()), matchEqual));
 119                 }
 120         case opAnd:
 121                 return eval(depth) & eval(depth);
 122         case opOr:
 123                 return eval(depth) | eval(depth);
 124         case opCDHash:
 125                 if (mContext->directory) {
 126                         CFRef<CFDataRef> cdhash = mContext->directory->cdhash();
 127                         CFRef<CFDataRef> required = getHash();
 128                         return CFEqual(cdhash, required);
 129                 } else
 130                         return false;
 131         case opNot:
 132                 return !eval(depth);
 133         case opInfoKeyField:
 134                 {
 135                         string key = getString();
 136                         Match match(*this);
 137                         return infoKeyValue(key, match);
 138                 }
 139         case opEntitlementField:
 140                 {
 141                         string key = getString();
 142                         Match match(*this);
 143                         return entitlementValue(key, match);
 144                 }
 145         case opCertField:
 146                 {
 147                         SecCertificateRef cert = mContext->cert(get<int32_t>());
 148                         string key = getString();
 149                         Match match(*this);
 150                         return certFieldValue(key, match, cert);
 151                 }
 152         case opCertGeneric:
 153                 {
 154                         SecCertificateRef cert = mContext->cert(get<int32_t>());
 155                         string key = getString();
 156                         Match match(*this);
 157                         return certFieldGeneric(key, match, cert);
 158                 }
 159         case opCertPolicy:
 160                 {
 161                         SecCertificateRef cert = mContext->cert(get<int32_t>());
 162                         string key = getString();
 163                         Match match(*this);
 164                         return certFieldPolicy(key, match, cert);
 165                 }
 166         case opTrustedCert:
 167                 return trustedCert(get<int32_t>());
 168         case opTrustedCerts:
 169                 return trustedCerts();
 170         case opNamedAnchor:
 171                 return fragments().namedAnchor(getString(), *mContext);
 172         case opNamedCode:
 173                 return fragments().named(getString(), *mContext);
 174         case opPlatform:
 175                 {
 176                         int32_t targetPlatform = get<int32_t>();
 177                         return mContext->directory && mContext->directory->platform == targetPlatform;
 178                 }
 179         default:
 180                 // opcode not recognized - handle generically if possible, fail otherwise
 181                 if (op & (opGenericFalse | opGenericSkip)) {
 182                         // unknown opcode, but it has a size field and can be safely bypassed
 183                         skip(get<uint32_t>());
 184                         if (op & opGenericFalse) {
 185                                 CODESIGN_EVAL_REQINT_UNKNOWN_FALSE(op);
 186                                 return false;
 187                         } else {
 188                                 CODESIGN_EVAL_REQINT_UNKNOWN_SKIPPED(op);
 189                                 return eval(depth);
 190                         }
 191                 }
 192                 // unrecognized opcode and no way to interpret it
 193                 secinfo("csinterp", "opcode 0x%x cannot be handled; aborting", op);
 194                 MacOSError::throwMe(errSecCSUnimplemented);
 195         }
 196 }
 197
 198
 199 //
 200 // Evaluate an Info.plist key condition
 201 //
 202 bool Requirement::Interpreter::infoKeyValue(const string &key, const Match &match)
 203 {
 204         if (mContext->info)             // we have an Info.plist
 205                 if (CFTypeRef value = CFDictionaryGetValue(mContext->info, CFTempString(key)))
 206                         return match(value);
 207         return false;
 208 }
 209
 210
 211 //
 212 // Evaluate an entitlement condition
 213 //
 214 bool Requirement::Interpreter::entitlementValue(const string &key, const Match &match)
 215 {
 216         if (mContext->entitlements)             // we have an Info.plist
 217                 if (CFTypeRef value = CFDictionaryGetValue(mContext->entitlements, CFTempString(key)))
 218                         return match(value);
 219         return false;
 220 }
 221
 222
 223 bool Requirement::Interpreter::certFieldValue(const string &key, const Match &match, SecCertificateRef cert)
 224 {
 225         // no cert, no chance
 226         if (cert == NULL)
 227                 return false;
 228
 229         // a table of recognized keys for the "certificate[foo]" syntax
 230         static const struct CertField {
 231                 const char *name;
 232                 const CSSM_OID *oid;
 233         } certFields[] = {
 234                 { "subject.C", &CSSMOID_CountryName },
 235                 { "subject.CN", &CSSMOID_CommonName },
 236                 { "subject.D", &CSSMOID_Description },
 237                 { "subject.L", &CSSMOID_LocalityName },
 238 //              { "subject.C-L", &CSSMOID_CollectiveLocalityName },     // missing from Security.framework headers
 239                 { "subject.O", &CSSMOID_OrganizationName },
 240                 { "subject.C-O", &CSSMOID_CollectiveOrganizationName },
 241                 { "subject.OU", &CSSMOID_OrganizationalUnitName },
 242                 { "subject.C-OU", &CSSMOID_CollectiveOrganizationalUnitName },
 243                 { "subject.ST", &CSSMOID_StateProvinceName },
 244                 { "subject.C-ST", &CSSMOID_CollectiveStateProvinceName },
 245                 { "subject.STREET", &CSSMOID_StreetAddress },
 246                 { "subject.C-STREET", &CSSMOID_CollectiveStreetAddress },
 247                 { "subject.UID", &CSSMOID_UserID },
 248                 { NULL, NULL }
 249         };
 250
 251         // DN-component single-value match
 252         for (const CertField *cf = certFields; cf->name; cf++)
 253                 if (cf->name == key) {
 254                         CFRef<CFStringRef> value;
 255             OSStatus rc = SecCertificateCopySubjectComponent(cert, cf->oid, &value.aref());
 256                         if (rc) {
 257                                 secinfo("csinterp", "cert %p lookup for DN.%s failed rc=%d", cert, key.c_str(), (int)rc);
 258                                 return false;
 259                         }
 260                         return match(value);
 261                 }
 262
 263         // email multi-valued match (any of...)
 264         if (key == "email") {
 265                 CFRef<CFArrayRef> value;
 266         OSStatus rc = SecCertificateCopyEmailAddresses(cert, &value.aref());
 267                 if (rc) {
 268                         secinfo("csinterp", "cert %p lookup for email failed rc=%d", cert, (int)rc);
 269                         return false;
 270                 }
 271                 return match(value);
 272         }
 273
 274         // unrecognized key. Fail but do not abort to promote backward compatibility down the road
 275         secinfo("csinterp", "cert field notation \"%s\" not understood", key.c_str());
 276         return false;
 277 }
 278
 279
 280 bool Requirement::Interpreter::certFieldGeneric(const string &key, const Match &match, SecCertificateRef cert)
 281 {
 282         // the key is actually a (binary) OID value
 283         CssmOid oid((char *)key.data(), key.length());
 284         return certFieldGeneric(oid, match, cert);
 285 }
 286
 287 bool Requirement::Interpreter::certFieldGeneric(const CssmOid &oid, const Match &match, SecCertificateRef cert)
 288 {
 289         return cert && certificateHasField(cert, oid) && match(kCFBooleanTrue);
 290 }
 291
 292 bool Requirement::Interpreter::certFieldPolicy(const string &key, const Match &match, SecCertificateRef cert)
 293 {
 294         // the key is actually a (binary) OID value
 295         CssmOid oid((char *)key.data(), key.length());
 296         return certFieldPolicy(oid, match, cert);
 297 }
 298
 299 bool Requirement::Interpreter::certFieldPolicy(const CssmOid &oid, const Match &match, SecCertificateRef cert)
 300 {
 301         return cert && certificateHasPolicy(cert, oid) && match(kCFBooleanTrue);
 302 }
 303
 304
 305 //
 306 // Check the Apple-signed condition
 307 //
 308 bool Requirement::Interpreter::appleAnchored()
 309 {
 310         if (SecCertificateRef cert = mContext->cert(anchorCert))
 311                 if (isAppleCA(cert))
 312                 return true;
 313         return false;
 314 }
 315
 316 static CFStringRef kAMFINVRAMTrustedKeys = CFSTR("AMFITrustedKeys");
 317
 318 CFArrayRef Requirement::Interpreter::getAdditionalTrustedAnchors()
 319 {
 320     __block CFRef<CFMutableArrayRef> keys = makeCFMutableArray(0);
 321
 322     try {
 323         io_registry_entry_t entry = IORegistryEntryFromPath(kIOMasterPortDefault, "IODeviceTree:/options");
 324         if (entry == IO_OBJECT_NULL)
 325             return NULL;
 326
 327         CFRef<CFDataRef> configData = (CFDataRef)IORegistryEntryCreateCFProperty(entry, kAMFINVRAMTrustedKeys, kCFAllocatorDefault, 0);
 328         IOObjectRelease(entry);
 329         if (!configData)
 330             return NULL;
 331
 332         CFRef<CFDictionaryRef> configDict = CFDictionaryRef(IOCFUnserializeWithSize((const char *)CFDataGetBytePtr(configData),
 333                                                                                     (size_t)CFDataGetLength(configData),
 334                                                                                     kCFAllocatorDefault, 0, NULL));
 335         if (!configDict)
 336             return NULL;
 337
 338         CFArrayRef trustedKeys = CFArrayRef(CFDictionaryGetValue(configDict, CFSTR("trustedKeys")));
 339         if (!trustedKeys && CFGetTypeID(trustedKeys) != CFArrayGetTypeID())
 340             return NULL;
 341
 342         cfArrayApplyBlock(trustedKeys, ^(const void *value) {
 343             CFDictionaryRef key = CFDictionaryRef(value);
 344             if (!key && CFGetTypeID(key) != CFDictionaryGetTypeID())
 345                 return;
 346
 347             CFDataRef hash = CFDataRef(CFDictionaryGetValue(key, CFSTR("certDigest")));
 348             if (!hash && CFGetTypeID(hash) != CFDataGetTypeID())
 349                 return;
 350             CFArrayAppendValue(keys, hash);
 351         });
 352
 353     } catch (...) {
 354     }
 355
 356     if (CFArrayGetCount(keys) == 0)
 357         return NULL;
 358
 359     return keys.yield();
 360 }
 361
 362 bool Requirement::Interpreter::appleLocalAnchored()
 363 {
 364     static CFArrayRef additionalTrustedCertificates = NULL;
 365
 366     if (csr_check(CSR_ALLOW_APPLE_INTERNAL))
 367         return false;
 368
 369     static dispatch_once_t onceToken;
 370     dispatch_once(&onceToken, ^{
 371         additionalTrustedCertificates = getAdditionalTrustedAnchors();
 372     });
 373
 374     if (additionalTrustedCertificates == NULL)
 375         return false;
 376
 377     CFRef<CFDataRef> hash = SecCertificateCopySHA256Digest(mContext->cert(leafCert));
 378     if (!hash)
 379         return false;
 380
 381     if (CFArrayContainsValue(additionalTrustedCertificates, CFRangeMake(0, CFArrayGetCount(additionalTrustedCertificates)), hash))
 382         return true;
 383
 384     return false;
 385 }
 386
 387 bool Requirement::Interpreter::appleSigned()
 388 {
 389     if (appleAnchored()) {
 390                 if (SecCertificateRef intermed = mContext->cert(-2))    // first intermediate
 391                         // first intermediate common name match (exact)
 392                         if (certFieldValue("subject.CN", Match(appleIntermediateCN, matchEqual), intermed)
 393                                         && certFieldValue("subject.O", Match(appleIntermediateO, matchEqual), intermed))
 394                                 return true;
 395     } else if (appleLocalAnchored()) {
 396         return true;
 397     }
 398         return false;
 399 }
 400
 401
 402 //
 403 // Verify an anchor requirement against the context
 404 //
 405 bool Requirement::Interpreter::verifyAnchor(SecCertificateRef cert, const unsigned char *digest)
 406 {
 407         // get certificate bytes
 408         if (cert) {
 409                 CSSM_DATA certData;
 410                 MacOSError::check(SecCertificateGetData(cert, &certData));
 411
 412                 // verify hash
 413                 SHA1 hasher;
 414                 hasher(certData.Data, certData.Length);
 415                 return hasher.verify(digest);
 416         }
 417         return false;
 418 }
 419
 420
 421 //
 422 // Check one or all certificate(s) in the cert chain against the Trust Settings database.
 423 //
 424 bool Requirement::Interpreter::trustedCerts()
 425 {
 426         int anchor = mContext->certCount() - 1;
 427         for (int slot = 0; slot <= anchor; slot++)
 428                 if (SecCertificateRef cert = mContext->cert(slot))
 429                         switch (trustSetting(cert, slot == anchor)) {
 430                         case kSecTrustSettingsResultTrustRoot:
 431                         case kSecTrustSettingsResultTrustAsRoot:
 432                                 return true;
 433                         case kSecTrustSettingsResultDeny:
 434                                 return false;
 435                         case kSecTrustSettingsResultUnspecified:
 436                                 break;
 437                         default:
 438                                 assert(false);
 439                                 return false;
 440                         }
 441                 else
 442                         return false;
 443         return false;
 444 }
 445
 446 bool Requirement::Interpreter::trustedCert(int slot)
 447 {
 448         if (SecCertificateRef cert = mContext->cert(slot)) {
 449                 int anchorSlot = mContext->certCount() - 1;
 450                 switch (trustSetting(cert, slot == anchorCert || slot == anchorSlot)) {
 451                 case kSecTrustSettingsResultTrustRoot:
 452                 case kSecTrustSettingsResultTrustAsRoot:
 453                         return true;
 454                 case kSecTrustSettingsResultDeny:
 455                 case kSecTrustSettingsResultUnspecified:
 456                         return false;
 457                 default:
 458                         assert(false);
 459                         return false;
 460                 }
 461         } else
 462                 return false;
 463 }
 464
 465
 466 //
 467 // Explicitly check one certificate against the Trust Settings database and report
 468 // the findings. This is a helper for the various Trust Settings evaluators.
 469 //
 470 SecTrustSettingsResult Requirement::Interpreter::trustSetting(SecCertificateRef cert, bool isAnchor)
 471 {
 472         // the SPI input is the uppercase hex form of the SHA-1 of the certificate...
 473         assert(cert);
 474         SHA1::Digest digest;
 475         hashOfCertificate(cert, digest);
 476         string Certhex = CssmData(digest, sizeof(digest)).toHex();
 477         for (string::iterator it = Certhex.begin(); it != Certhex.end(); ++it)
 478                 if (islower(*it))
 479                         *it = toupper(*it);
 480
 481         // call Trust Settings and see what it finds
 482         SecTrustSettingsDomain domain;
 483         SecTrustSettingsResult result;
 484         CSSM_RETURN *errors = NULL;
 485         uint32 errorCount = 0;
 486         bool foundMatch, foundAny;
 487         switch (OSStatus rc = SecTrustSettingsEvaluateCert(
 488                 CFTempString(Certhex),                                  // settings index
 489                 &CSSMOID_APPLE_TP_CODE_SIGNING,                 // standard code signing policy
 490                 NULL, 0,                                                                // policy string (unused)
 491                 kSecTrustSettingsKeyUseAny,                             // no restriction on key usage @@@
 492                 isAnchor,                                                               // consult system default anchor set
 493
 494                 &domain,                                                                // domain of found setting
 495                 &errors, &errorCount,                                   // error set and maximum count
 496                 &result,                                                                // the actual setting
 497                 &foundMatch, &foundAny                                  // optimization hints (not used)
 498                 )) {
 499         case errSecSuccess:
 500                 ::free(errors);
 501                 if (foundMatch)
 502                         return result;
 503                 else
 504                         return kSecTrustSettingsResultUnspecified;
 505         default:
 506                 ::free(errors);
 507                 MacOSError::throwMe(rc);
 508         }
 509 }
 510
 511
 512 //
 513 // Create a Match object from the interpreter stream
 514 //
 515 Requirement::Interpreter::Match::Match(Interpreter &interp)
 516 {
 517         switch (mOp = interp.get<MatchOperation>()) {
 518         case matchExists:
 519                 break;
 520         case matchEqual:
 521         case matchContains:
 522         case matchBeginsWith:
 523         case matchEndsWith:
 524         case matchLessThan:
 525         case matchGreaterThan:
 526         case matchLessEqual:
 527         case matchGreaterEqual:
 528                 mValue.take(makeCFString(interp.getString()));
 529                 break;
 530         default:
 531                 // Assume this (unknown) match type has a single data argument.
 532                 // This gives us a chance to keep the instruction stream aligned.
 533                 interp.getString();                     // discard
 534                 break;
 535         }
 536 }
 537
 538
 539 //
 540 // Execute a match against a candidate value
 541 //
 542 bool Requirement::Interpreter::Match::operator () (CFTypeRef candidate) const
 543 {
 544         // null candidates always fail
 545         if (!candidate)
 546                 return false;
 547
 548         // interpret an array as matching alternatives (any one succeeds)
 549         if (CFGetTypeID(candidate) == CFArrayGetTypeID()) {
 550                 CFArrayRef array = CFArrayRef(candidate);
 551                 CFIndex count = CFArrayGetCount(array);
 552                 for (CFIndex n = 0; n < count; n++)
 553                         if ((*this)(CFArrayGetValueAtIndex(array, n)))  // yes, it's recursive
 554                                 return true;
 555         }
 556
 557         switch (mOp) {
 558         case matchExists:               // anything but NULL and boolean false "exists"
 559                 return !CFEqual(candidate, kCFBooleanFalse);
 560         case matchEqual:                // equality works for all CF types
 561                 return CFEqual(candidate, mValue);
 562         case matchContains:
 563                 if (CFGetTypeID(candidate) == CFStringGetTypeID()) {
 564                         CFStringRef value = CFStringRef(candidate);
 565                         if (CFStringFindWithOptions(value, mValue, CFRangeMake(0, CFStringGetLength(value)), 0, NULL))
 566                                 return true;
 567                 }
 568                 return false;
 569         case matchBeginsWith:
 570                 if (CFGetTypeID(candidate) == CFStringGetTypeID()) {
 571                         CFStringRef value = CFStringRef(candidate);
 572                         if (CFStringFindWithOptions(value, mValue, CFRangeMake(0, CFStringGetLength(mValue)), 0, NULL))
 573                                 return true;
 574                 }
 575                 return false;
 576         case matchEndsWith:
 577                 if (CFGetTypeID(candidate) == CFStringGetTypeID()) {
 578                         CFStringRef value = CFStringRef(candidate);
 579                         CFIndex matchLength = CFStringGetLength(mValue);
 580                         CFIndex start = CFStringGetLength(value) - matchLength;
 581                         if (start >= 0)
 582                                 if (CFStringFindWithOptions(value, mValue, CFRangeMake(start, matchLength), 0, NULL))
 583                                         return true;
 584                 }
 585                 return false;
 586         case matchLessThan:
 587                 return inequality(candidate, kCFCompareNumerically, kCFCompareLessThan, true);
 588         case matchGreaterThan:
 589                 return inequality(candidate, kCFCompareNumerically, kCFCompareGreaterThan, true);
 590         case matchLessEqual:
 591                 return inequality(candidate, kCFCompareNumerically, kCFCompareGreaterThan, false);
 592         case matchGreaterEqual:
 593                 return inequality(candidate, kCFCompareNumerically, kCFCompareLessThan, false);
 594         default:
 595                 // unrecognized match types can never match
 596                 return false;
 597         }
 598 }
 599
 600
 601 bool Requirement::Interpreter::Match::inequality(CFTypeRef candidate, CFStringCompareFlags flags,
 602         CFComparisonResult outcome, bool negate) const
 603 {
 604         if (CFGetTypeID(candidate) == CFStringGetTypeID()) {
 605                 CFStringRef value = CFStringRef(candidate);
 606                 if ((CFStringCompare(value, mValue, flags) == outcome) == negate)
 607                         return true;
 608         }
 609         return false;
 610 }
 611
 612
 613 //
 614 // External fragments
 615 //
 616 Fragments::Fragments()
 617 {
 618         mMyBundle = CFBundleGetBundleWithIdentifier(CFSTR("com.apple.security"));
 619 }
 620
 621
 622 bool Fragments::evalNamed(const char *type, const std::string &name, const Requirement::Context &ctx)
 623 {
 624         if (CFDataRef fragData = fragment(type, name)) {
 625                 const Requirement *req = (const Requirement *)CFDataGetBytePtr(fragData);       // was prevalidated as Requirement
 626                 return req->validates(ctx);
 627         }
 628         return false;
 629 }
 630
 631
 632 CFDataRef Fragments::fragment(const char *type, const std::string &name)
 633 {
 634         string key = name + "!!" + type;        // compound key
 635         StLock<Mutex> _(mLock);                         // lock for cache access
 636         FragMap::const_iterator it = mFragments.find(key);
 637         if (it == mFragments.end()) {
 638                 CFRef<CFDataRef> fragData;              // will always be set (NULL on any errors)
 639                 if (CFRef<CFURLRef> fragURL = CFBundleCopyResourceURL(mMyBundle, CFTempString(name), CFSTR("csreq"), CFTempString(type)))
 640                         if (CFRef<CFDataRef> data = cfLoadFile(fragURL)) {      // got data
 641                                 const Requirement *req = (const Requirement *)CFDataGetBytePtr(data);
 642                                 if (req->validateBlob(CFDataGetLength(data)))   // looks like a Requirement...
 643                                         fragData = data;                        // ... so accept it
 644                                 else
 645                                         Syslog::warning("Invalid sub-requirement at %s", cfString(fragURL).c_str());
 646                         }
 647                 if (CODESIGN_EVAL_REQINT_FRAGMENT_LOAD_ENABLED())
 648                         CODESIGN_EVAL_REQINT_FRAGMENT_LOAD(type, name.c_str(), fragData ? CFDataGetBytePtr(fragData) : NULL);
 649                 mFragments[key] = fragData;             // cache it, success or failure
 650                 return fragData;
 651         }
 652         CODESIGN_EVAL_REQINT_FRAGMENT_HIT(type, name.c_str());
 653         return it->second;
 654 }
 655
 656
 657 }       // CodeSigning
 658 }       // Security