Security/libsecurity_keychain/lib/TrustSettings.cpp

   1 /*
   2  * Copyright (c) 2005,2011-2014 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  * TrustSettings.h - class to manage cert trust settings.
  26  *
  27  */
  28
  29 #include "TrustSettings.h"
  30 #include "TrustSettingsSchema.h"
  31 #include "SecTrustSettings.h"
  32 #include "TrustSettingsUtils.h"
  33 #include "TrustKeychains.h"
  34 #include "SecCertificatePriv.h"
  35 #include "SecPolicyPriv.h"
  36 #include "Certificate.h"
  37 #include "cssmdatetime.h"
  38 #include <Security/SecBase.h>
  39 #include "SecTrustedApplicationPriv.h"
  40 #include <security_utilities/errors.h>
  41 #include <security_utilities/debugging.h>
  42 #include <security_utilities/logging.h>
  43 #include <security_utilities/cfutilities.h>
  44 #include <security_utilities/alloc.h>
  45 #include <Security/cssmapplePriv.h>
  46 #include <Security/oidscert.h>
  47 #include <security_keychain/KCCursor.h>
  48 #include <security_ocspd/ocspdClient.h>
  49 #include <CoreFoundation/CoreFoundation.h>
  50 #include <assert.h>
  51 #include <Security/Authorization.h>
  52 #include <sys/stat.h>
  53
  54 #define trustSettingsDbg(args...)               secdebug("trustSettings", ## args)
  55 #define trustSettingsEvalDbg(args...)   secdebug("trustSettingsEval", ## args)
  56
  57 /*
  58  * Common error return for "malformed TrustSettings record"
  59  */
  60 #define errSecInvalidTrustedRootRecord  errSecInvalidTrustSettings
  61
  62 using namespace KeychainCore;
  63
  64 #pragma mark --- Static functions ---
  65
  66 /*
  67  * Comparator atoms to determine if an app's specified usage
  68  * matches an individual trust setting. Each returns true on a match, false
  69  * if the trust setting does not match the app's spec.
  70  *
  71  * A match fails iff:
  72  *
  73  * -- the app has specified a field, and the cert has a spec for that
  74  *    field, and the two specs do not match;
  75  *
  76  * OR
  77  *
  78  * -- the cert has a spec for the field and the app hasn't specified the field
  79  */
  80 static bool tsCheckPolicy(
  81         const CSSM_OID *appPolicy,
  82         CFDataRef certPolicy)
  83 {
  84         if(certPolicy != NULL) {
  85                 if(appPolicy == NULL) {
  86                         trustSettingsEvalDbg("tsCheckPolicy: certPolicy, !appPolicy");
  87                         return false;
  88                 }
  89                 unsigned cLen = (unsigned)CFDataGetLength(certPolicy);
  90                 const UInt8 *cData = CFDataGetBytePtr(certPolicy);
  91                 if((cLen != appPolicy->Length) || memcmp(appPolicy->Data, cData, cLen)) {
  92                         trustSettingsEvalDbg("tsCheckPolicy: policy mismatch");
  93                         return false;
  94                 }
  95         }
  96         return true;
  97 }
  98
  99 /*
 100  * This one's slightly different: the match is for *this* app, not one
 101  * specified by the app.
 102  */
 103 static bool tsCheckApp(
 104         CFDataRef certApp)
 105 {
 106         if(certApp != NULL) {
 107                 SecTrustedApplicationRef appRef;
 108                 OSStatus ortn;
 109                 ortn = SecTrustedApplicationCreateWithExternalRepresentation(certApp, &appRef);
 110                 if(ortn) {
 111                         trustSettingsDbg("tsCheckApp: bad trustedApp data\n");
 112                         return false;
 113                 }
 114                 ortn = SecTrustedApplicationValidateWithPath(appRef, NULL);
 115                 if(ortn) {
 116                         /* Not this app */
 117                         return false;
 118                 }
 119         }
 120
 121         return true;
 122 }
 123
 124 static bool tsCheckKeyUse(
 125         SecTrustSettingsKeyUsage appKeyUse,
 126         CFNumberRef certKeyUse)
 127 {
 128         if(certKeyUse != NULL) {
 129                 SInt32 certUse;
 130                 CFNumberGetValue(certKeyUse, kCFNumberSInt32Type, &certUse);
 131                 SecTrustSettingsKeyUsage cku = (SecTrustSettingsKeyUsage)certUse;
 132                 if(cku == kSecTrustSettingsKeyUseAny) {
 133                         /* explicitly allows anything */
 134                         return true;
 135                 }
 136                 /* cert specification must be a superset of app's intended use */
 137                 if(appKeyUse == 0) {
 138                         trustSettingsEvalDbg("tsCheckKeyUse: certKeyUsage, !appKeyUsage");
 139                         return false;
 140                 }
 141
 142                 if((cku & appKeyUse) != appKeyUse) {
 143                         trustSettingsEvalDbg("tsCheckKeyUse: keyUse mismatch");
 144                         return false;
 145                 }
 146         }
 147         return true;
 148 }
 149
 150 static bool tsCheckPolicyStr(
 151         const char *appPolicyStr,
 152         CFStringRef certPolicyStr)
 153 {
 154         if(certPolicyStr != NULL) {
 155                 if(appPolicyStr == NULL) {
 156                         trustSettingsEvalDbg("tsCheckPolicyStr: certPolicyStr, !appPolicyStr");
 157                         return false;
 158                 }
 159                 /* Let CF do the string compare */
 160                 CFStringRef cfPolicyStr = CFStringCreateWithCString(NULL, appPolicyStr,
 161                         kCFStringEncodingUTF8);
 162                 if(cfPolicyStr == NULL) {
 163                         /* I really don't see how this can happen */
 164                         trustSettingsEvalDbg("tsCheckPolicyStr: policyStr string conversion error");
 165                         return false;
 166                 }
 167
 168                 // Some trust setting strings were created with a NULL character at the
 169                 // end, which was included in the length. Strip those off before compare
 170
 171                 CFMutableStringRef certPolicyStrNoNULL = CFStringCreateMutableCopy(NULL, 0, certPolicyStr);
 172                 if (certPolicyStrNoNULL == NULL) {
 173                         /* I really don't see how this can happen either */
 174                         trustSettingsEvalDbg("tsCheckPolicyStr: policyStr string conversion error 2");
 175                         return false;
 176                 }
 177
 178                 CFStringFindAndReplace(certPolicyStrNoNULL, CFSTR("\00"),
 179                         CFSTR(""), CFRangeMake(0, CFStringGetLength(certPolicyStrNoNULL)), kCFCompareBackwards);
 180
 181                 CFComparisonResult res = CFStringCompare(cfPolicyStr, certPolicyStrNoNULL, 0);
 182                 CFRelease(cfPolicyStr);
 183                 CFRelease(certPolicyStrNoNULL);
 184                 if(res != kCFCompareEqualTo) {
 185                         trustSettingsEvalDbg("tsCheckPolicyStr: policyStr mismatch");
 186                         return false;
 187                 }
 188         }
 189         return true;
 190 }
 191
 192 /*
 193  * Determine if a cert's trust settings dictionary satisfies the specified
 194  * usage constraints. Returns true if so.
 195  * Only certs with a SecTrustSettingsResult of kSecTrustSettingsResultTrustRoot
 196  * or kSecTrustSettingsResultTrustAsRoot will match.
 197  */
 198 static bool qualifyUsageWithCertDict(
 199         CFDictionaryRef                 certDict,
 200         const CSSM_OID                  *policyOID,             /* optional */
 201         const char                              *policyStr,             /* optional */
 202         SecTrustSettingsKeyUsage keyUsage,      /* optional; default = any (actually "all" here) */
 203         bool                                    onlyRoots)
 204 {
 205         /* this array is optional */
 206         CFArrayRef trustSettings = (CFArrayRef)CFDictionaryGetValue(certDict,
 207                 kTrustRecordTrustSettings);
 208         CFIndex numSpecs = 0;
 209         if(trustSettings != NULL) {
 210                 numSpecs = CFArrayGetCount(trustSettings);
 211         }
 212         if(numSpecs == 0) {
 213                 /*
 214                  * Trivial case: cert has no trust settings, indicating that
 215                  * it's used for everything.
 216                  */
 217                 trustSettingsEvalDbg("qualifyUsageWithCertDict: no trust settings");
 218                 return true;
 219         }
 220         for(CFIndex addDex=0; addDex<numSpecs; addDex++) {
 221                 CFDictionaryRef tsDict = (CFDictionaryRef)CFArrayGetValueAtIndex(trustSettings,
 222                         addDex);
 223
 224                 /* per-cert specs: all optional */
 225                 CFDataRef   certPolicy     = (CFDataRef)CFDictionaryGetValue(tsDict,
 226                                                                                 kSecTrustSettingsPolicy);
 227                 CFDataRef   certApp        = (CFDataRef)CFDictionaryGetValue(tsDict,
 228                                                                                 kSecTrustSettingsApplication);
 229                 CFStringRef certPolicyStr  = (CFStringRef)CFDictionaryGetValue(tsDict,
 230                                                                                 kSecTrustSettingsPolicyString);
 231                 CFNumberRef certKeyUsage   = (CFNumberRef)CFDictionaryGetValue(tsDict,
 232                                                                                 kSecTrustSettingsKeyUsage);
 233                 CFNumberRef certResultType = (CFNumberRef)CFDictionaryGetValue(tsDict,
 234                                                                                 kSecTrustSettingsResult);
 235
 236                 if(!tsCheckPolicy(policyOID, certPolicy)) {
 237                         continue;
 238                 }
 239                 if(!tsCheckApp(certApp)) {
 240                         continue;
 241                 }
 242                 if(!tsCheckKeyUse(keyUsage, certKeyUsage)) {
 243                         continue;
 244                 }
 245                 if(!tsCheckPolicyStr(policyStr, certPolicyStr)) {
 246                         continue;
 247                 }
 248
 249                 /*
 250                  * This is a match, take whatever SecTrustSettingsResult is here,
 251                  * including the default if not specified.
 252                  */
 253                 SecTrustSettingsResult resultType = kSecTrustSettingsResultTrustRoot;
 254                 if(certResultType) {
 255                         SInt32 s;
 256                         CFNumberGetValue(certResultType, kCFNumberSInt32Type, &s);
 257                         resultType = (SecTrustSettingsResult)s;
 258                 }
 259                 switch(resultType) {
 260                         case kSecTrustSettingsResultTrustRoot:
 261                                 trustSettingsEvalDbg("qualifyUsageWithCertDict: TrustRoot MATCH");
 262                                 return true;
 263                         case kSecTrustSettingsResultTrustAsRoot:
 264                                 if(onlyRoots) {
 265                                         trustSettingsEvalDbg("qualifyUsageWithCertDict: TrustAsRoot but not root");
 266                                         return false;
 267                                 }
 268                                 trustSettingsEvalDbg("qualifyUsageWithCertDict: TrustAsRoot MATCH");
 269                                 return true;
 270                         default:
 271                                 trustSettingsEvalDbg("qualifyUsageWithCertDict: bad resultType "
 272                                         "(%lu)", (unsigned long)resultType);
 273                                 return false;
 274                 }
 275         }
 276         trustSettingsEvalDbg("qualifyUsageWithCertDict: NO MATCH");
 277         return false;
 278 }
 279
 280 /*
 281  * Create initial top-level dictionary when constructing a new TrustSettings.
 282  */
 283 static CFMutableDictionaryRef tsInitialDict()
 284 {
 285         CFMutableDictionaryRef dict = CFDictionaryCreateMutable(NULL,
 286                 kSecTrustRecordNumTopDictKeys,
 287                 &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
 288
 289         /* the dictionary of per-cert entries */
 290         CFMutableDictionaryRef trustDict = CFDictionaryCreateMutable(NULL, 0,
 291                 &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
 292         CFDictionaryAddValue(dict, kTrustRecordTrustList, trustDict);
 293         CFRelease(trustDict);
 294
 295         SInt32 vers = kSecTrustRecordVersionCurrent;
 296         CFNumberRef cfVers = CFNumberCreate(NULL, kCFNumberSInt32Type, &vers);
 297         CFDictionaryAddValue(dict, kTrustRecordVersion, cfVers);
 298         CFRelease(cfVers);
 299         return dict;
 300 }
 301
 302 /*
 303  * Set the modification date of a per-cert dictionary to current time.
 304  */
 305 static void tsSetModDate(
 306         CFMutableDictionaryRef dict)
 307 {
 308         CFDateRef modDate;
 309
 310         modDate = CFDateCreate(NULL, CFAbsoluteTimeGetCurrent());
 311         CFDictionarySetValue(dict, kTrustRecordModDate, modDate);
 312         CFRelease(modDate);
 313 }
 314
 315 /* make sure a presumed CFNumber can be converted to a 32-bit number */
 316 static
 317 bool tsIsGoodCfNum(CFNumberRef cfn, SInt32 *num = NULL)
 318 {
 319         if(cfn == NULL) {
 320                 /* by convention */
 321                 if(num) {
 322                         *num = 0;
 323                 }
 324                 return true;
 325         }
 326         if(CFGetTypeID(cfn) != CFNumberGetTypeID()) {
 327                 return false;
 328         }
 329
 330         SInt32 s;
 331         if(!CFNumberGetValue(cfn, kCFNumberSInt32Type, &s)) {
 332                 return false;
 333         }
 334         else {
 335                 if(num) {
 336                         *num = s;
 337                 }
 338                 return true;
 339         }
 340 }
 341
 342 TrustSettings::TrustSettings(SecTrustSettingsDomain domain)
 343                 : mPropList(NULL),
 344                   mTrustDict(NULL),
 345                   mDictVersion(0),
 346                   mDomain(domain),
 347                   mDirty(false)
 348 {
 349 }
 350
 351
 352
 353 #pragma mark --- Public methods ---
 354
 355 /*
 356  * Normal constructor, from disk.
 357  * If create is true, the absence of an on-disk TrustSettings file
 358  * results in the creation of a new empty TrustSettings. If create is
 359  * false and no on-disk TrustSettings exists, errSecNoTrustSettings is
 360  * thrown.
 361  * If trim is true, the components of the on-disk TrustSettings not
 362  * needed for cert evaluation are discarded. This is for TrustSettings
 363  * that will be cached in memory long-term.
 364  */
 365 OSStatus TrustSettings::CreateTrustSettings(
 366         SecTrustSettingsDomain  domain,
 367         bool                                    create,
 368         bool                                    trim,
 369         TrustSettings*&                 ts)
 370 {
 371         TrustSettings* t = new TrustSettings(domain);
 372
 373         Allocator &alloc = Allocator::standard();
 374         CSSM_DATA fileData = {0, NULL};
 375         OSStatus ortn = errSecSuccess;
 376         struct stat sb;
 377         const char *path;
 378
 379         /* get trust settings from file, one way or another */
 380         switch(domain) {
 381                 case kSecTrustSettingsDomainAdmin:
 382                         /*
 383                          * Quickie optimization: if it's not there, don't try to
 384                          * get it from ocspd. This is possible because the name of the
 385                          * admin file is hard coded, but the per-user files aren't.
 386                          */
 387                         path = TRUST_SETTINGS_PATH "/" ADMIN_TRUST_SETTINGS;
 388                         if(stat(path, &sb)) {
 389                                 trustSettingsDbg("TrustSettings: no admin record; skipping");
 390                                 ortn = errSecNoTrustSettings;
 391                                 break;
 392                         }
 393                         /* else drop thru, get it from ocspd */
 394                 case kSecTrustSettingsDomainUser:
 395                         /* get settings from ocspd */
 396                         ortn = ocspdTrustSettingsRead(alloc, domain, fileData);
 397                         break;
 398                 case kSecTrustSettingsDomainSystem:
 399                         /* immutable; it's safe for us to read this directly */
 400                         if(tsReadFile(SYSTEM_TRUST_SETTINGS_PATH, alloc, fileData)) {
 401                                 ortn = errSecNoTrustSettings;
 402                         }
 403                         break;
 404                 default:
 405                         delete t;
 406                         return errSecParam;
 407         }
 408         if(ortn) {
 409                 if(create) {
 410                         trustSettingsDbg("TrustSettings: creating new record for domain %d",
 411                                 (int)domain);
 412                         t->mPropList = tsInitialDict();
 413                         t->mDirty = true;
 414                 }
 415                 else {
 416                         trustSettingsDbg("TrustSettings: record not found for domain %d",
 417                                 (int)domain);
 418                         delete t;
 419                         return ortn;
 420                 }
 421         }
 422         else {
 423                 CFRef<CFDataRef> propList(CFDataCreate(NULL, fileData.Data, fileData.Length));
 424                 t->initFromData(propList);
 425                 alloc.free(fileData.Data);
 426         }
 427         t->validatePropList(trim);
 428
 429         ts = t;
 430         return errSecSuccess;
 431 }
 432
 433 /*
 434  * Create from external data, obtained by createExternal().
 435  * If externalData is NULL, we'll create an empty mTrustDict.
 436  */
 437 OSStatus TrustSettings::CreateTrustSettings(
 438         SecTrustSettingsDomain                          domain,
 439         CFDataRef                                                       externalData,
 440         TrustSettings*&                                         ts)
 441 {
 442         switch(domain) {
 443                 case kSecTrustSettingsDomainUser:
 444                 case kSecTrustSettingsDomainAdmin:
 445                 case kSecTrustSettingsDomainMemory:
 446                         break;
 447                 case kSecTrustSettingsDomainSystem:             /* no can do, that implies writing to it */
 448                 default:
 449                         return errSecParam;
 450         }
 451
 452         TrustSettings* t = new TrustSettings(domain);
 453
 454         if(externalData != NULL) {
 455                 t->initFromData(externalData);
 456         }
 457         else {
 458                 t->mPropList = tsInitialDict();
 459         }
 460         t->validatePropList(TRIM_NO);           /* never trim this */
 461         t->mDirty = true;
 462
 463         ts = t;
 464         return errSecSuccess;
 465 }
 466
 467
 468 TrustSettings::~TrustSettings()
 469 {
 470         trustSettingsDbg("TrustSettings(domain %d) destructor", (int)mDomain);
 471         CFRELEASE(mPropList);           /* may be null if trimmed */
 472         CFRELEASE(mTrustDict);          /* normally always non-NULL */
 473
 474 }
 475
 476 /* common code to init mPropList from raw data */
 477 void TrustSettings::initFromData(
 478         CFDataRef       trustSettingsData)
 479 {
 480         CFStringRef errStr = NULL;
 481
 482         mPropList = (CFMutableDictionaryRef)CFPropertyListCreateFromXMLData(
 483                 NULL,
 484                 trustSettingsData,
 485                 kCFPropertyListMutableContainersAndLeaves,
 486                 &errStr);
 487         if(mPropList == NULL) {
 488                 trustSettingsDbg("TrustSettings::initFromData decode err (%s)",
 489                         errStr ? CFStringGetCStringPtr(errStr, kCFStringEncodingUTF8) : "<no err>");
 490                 if(errStr != NULL) {
 491                         CFRelease(errStr);
 492                 }
 493                 MacOSError::throwMe(errSecInvalidTrustSettings);
 494         }
 495 }
 496
 497 /*
 498  * Flush property list data out to disk if dirty.
 499  */
 500 void TrustSettings::flushToDisk()
 501 {
 502         if(!mDirty) {
 503                 trustSettingsDbg("flushToDisk, domain %d, !dirty!", (int)mDomain);
 504                 return;
 505         }
 506         if(mPropList == NULL) {
 507                 trustSettingsDbg("flushToDisk, domain %d, trimmed!", (int)mDomain);
 508                 assert(0);
 509                 MacOSError::throwMe(errSecInternalComponent);
 510         }
 511         switch(mDomain) {
 512                 case kSecTrustSettingsDomainSystem:
 513                 case kSecTrustSettingsDomainMemory:
 514                 /* caller shouldn't even try this */
 515                 default:
 516                         trustSettingsDbg("flushToDisk, bad domain (%d)", (int)mDomain);
 517                         MacOSError::throwMe(errSecInternalComponent);
 518                 case kSecTrustSettingsDomainUser:
 519                 case kSecTrustSettingsDomainAdmin:
 520                         break;
 521         }
 522
 523         /*
 524          * Optimization: if there are no certs in the mTrustDict dictionary,
 525          * we tell ocspd to *remove* the settings for the specified domain.
 526          * Having *no* settings uses less memory and is faster than having
 527          * an empty settings file, especially for the admin domain, where we
 528          * can avoid
 529          * an RPC if the settings file is simply not there.
 530          */
 531         CFRef<CFDataRef> xmlData;
 532         CSSM_DATA cssmXmlData = {0, NULL};
 533         CFIndex numCerts = CFDictionaryGetCount(mTrustDict);
 534         if(numCerts) {
 535                 xmlData.take(CFPropertyListCreateXMLData(NULL, mPropList));
 536                 if(!xmlData) {
 537                         /* we've been very careful; this should never happen */
 538                         trustSettingsDbg("flushToDisk, domain %d: error converting to XML", (int)mDomain);
 539                         MacOSError::throwMe(errSecInternalComponent);
 540                 }
 541                 cssmXmlData.Data = (uint8 *)CFDataGetBytePtr(xmlData);
 542                 cssmXmlData.Length = CFDataGetLength(xmlData);
 543         }
 544         else {
 545                 trustSettingsDbg("flushToDisk, domain %d: DELETING trust settings", (int)mDomain);
 546         }
 547
 548         /* cook up auth stuff so ocspd can act on our behalf */
 549         AuthorizationRef authRef;
 550         OSStatus ortn;
 551         ortn = AuthorizationCreate(NULL, kAuthorizationEmptyEnvironment,
 552                         0, &authRef);
 553         if(ortn) {
 554                 trustSettingsDbg("flushToDisk, domain %d: AuthorizationCreate returned %ld",
 555                         (int)mDomain, (long)ortn);
 556                 MacOSError::throwMe(errSecInternalComponent);
 557         }
 558         AuthorizationExternalForm authExt;
 559         CSSM_DATA authBlob = {sizeof(authExt), (uint8 *)&authExt};
 560         ortn = AuthorizationMakeExternalForm(authRef, &authExt);
 561         if(ortn) {
 562                 trustSettingsDbg("flushToDisk, domain %d: AuthorizationMakeExternalForm returned %ld",
 563                         (int)mDomain, (long)ortn);
 564                 ortn = errSecInternalComponent;
 565                 goto errOut;
 566         }
 567
 568         ortn = ocspdTrustSettingsWrite(mDomain, authBlob, cssmXmlData);
 569         if(ortn) {
 570                 trustSettingsDbg("flushToDisk, domain %d: ocspdTrustSettingsWrite returned %ld",
 571                         (int)mDomain, (long)ortn);
 572                 goto errOut;
 573         }
 574         trustSettingsDbg("flushToDisk, domain %d: wrote to disk", (int)mDomain);
 575         mDirty = false;
 576 errOut:
 577         AuthorizationFree(authRef, 0);
 578         if(ortn) {
 579                 MacOSError::throwMe(ortn);
 580         }
 581 }
 582
 583 /*
 584  * Obtain external representation of TrustSettings data.
 585  */
 586 CFDataRef TrustSettings::createExternal()
 587 {
 588         assert(mPropList);
 589         CFDataRef xmlData = CFPropertyListCreateXMLData(NULL, mPropList);
 590         if(xmlData == NULL) {
 591                 trustSettingsDbg("createExternal, domain %d: error converting to XML",
 592                         (int)mDomain);
 593                 MacOSError::throwMe(errSecInternalComponent);
 594         }
 595         return xmlData;
 596 }
 597
 598 /*
 599  * Evaluate specified cert. Returns true if we found a record for the cert
 600  * matching specified constraints.
 601  * Note that a true return with a value of kSecTrustSettingsResultUnspecified for
 602  * the resultType means that a cert isn't to be trusted or untrusted
 603  * per se; it just means that we only found allowedErrors entries.
 604  *
 605  * Found "allows errors" values are added to the incoming allowedErrors
 606  * array which is reallocd as needed (and which may be NULL or non-NULL on
 607  * entry).
 608  */
 609 bool TrustSettings::evaluateCert(
 610         CFStringRef                             certHashStr,
 611         const CSSM_OID                  *policyOID,                     /* optional */
 612         const char                              *policyStr,                     /* optional */
 613         SecTrustSettingsKeyUsage keyUsage,                      /* optional */
 614         bool                                    isRootCert,                     /* for checking default setting */
 615         CSSM_RETURN                             **allowedErrors,        /* IN/OUT; reallocd as needed */
 616         uint32                                  *numAllowedErrors,      /* IN/OUT */
 617         SecTrustSettingsResult  *resultType,            /* RETURNED */
 618         bool                                    *foundAnyEntry)         /* RETURNED */
 619 {
 620         assert(mTrustDict != NULL);
 621
 622         /* get trust settings dictionary for this cert */
 623         CFDictionaryRef certDict = findDictionaryForCertHash(certHashStr);
 624         if((certDict == NULL) && isRootCert) {
 625                 /* No? How about default root setting for this domain? */
 626                 certDict = findDictionaryForCertHash(kSecTrustRecordDefaultRootCert);
 627         }
 628 #if CERT_HASH_DEBUG
 629         /* @@@ debug only @@@ */
 630         /* print certificate hash and found dictionary reference */
 631         const size_t maxHashStrLen = 512;
 632         char *buf = (char*)malloc(maxHashStrLen);
 633         if (buf) {
 634                 if (!CFStringGetCString(certHashStr, buf, (CFIndex)maxHashStrLen, kCFStringEncodingUTF8)) {
 635                         buf[0]='\0';
 636                 }
 637                 trustSettingsEvalDbg("evaluateCert for \"%s\", found dict %p", buf, certDict);
 638                 free(buf);
 639         }
 640 #endif
 641
 642         if(certDict == NULL) {
 643                 *foundAnyEntry = false;
 644                 return false;
 645         }
 646         *foundAnyEntry = true;
 647
 648         /* to-be-returned array of allowed errors */
 649         CSSM_RETURN *allowedErrs = *allowedErrors;
 650         uint32 numAllowedErrs = *numAllowedErrors;
 651
 652         /* this means "we found something other than allowedErrors" if true */
 653         bool foundSettings = false;
 654
 655         /* to be returned in *resultType if it ends up something other than Invalid */
 656         SecTrustSettingsResult returnedResult = kSecTrustSettingsResultInvalid;
 657
 658         /*
 659          * Note since we validated the entire mPropList in our constructor, and we're careful
 660          * about what we put into it, we don't bother typechecking its contents here.
 661          * Also note that the kTrustRecordTrustSettings entry is optional.
 662          */
 663         CFArrayRef trustSettings = (CFArrayRef)CFDictionaryGetValue(certDict,
 664                         kTrustRecordTrustSettings);
 665         CFIndex numSpecs = 0;
 666         if(trustSettings != NULL) {
 667                 numSpecs = CFArrayGetCount(trustSettings);
 668         }
 669         if(numSpecs == 0) {
 670                 /*
 671                  * Trivial case: cert has no trust settings, indicating that
 672                  * it's used for everything.
 673                  */
 674                 trustSettingsEvalDbg("evaluateCert: no trust settings");
 675                 /* the default... */
 676                 *resultType = kSecTrustSettingsResultTrustRoot;
 677                 return true;
 678         }
 679
 680         /*
 681          * The decidedly nontrivial part: grind thru all of the cert's trust
 682          * settings, see if the cert matches the caller's specified usage.
 683          */
 684         for(CFIndex addDex=0; addDex<numSpecs; addDex++) {
 685                 CFDictionaryRef tsDict = (CFDictionaryRef)CFArrayGetValueAtIndex(trustSettings,
 686                         addDex);
 687
 688                 /* per-cert specs: all optional */
 689                 CFDataRef   certPolicy     = (CFDataRef)CFDictionaryGetValue(tsDict,
 690                                                                                 kSecTrustSettingsPolicy);
 691                 CFDataRef   certApp        = (CFDataRef)CFDictionaryGetValue(tsDict,
 692                                                                                 kSecTrustSettingsApplication);
 693                 CFStringRef certPolicyStr  = (CFStringRef)CFDictionaryGetValue(tsDict,
 694                                                                                 kSecTrustSettingsPolicyString);
 695                 CFNumberRef certKeyUsage   = (CFNumberRef)CFDictionaryGetValue(tsDict,
 696                                                                                 kSecTrustSettingsKeyUsage);
 697                 CFNumberRef certResultType = (CFNumberRef)CFDictionaryGetValue(tsDict,
 698                                                                                 kSecTrustSettingsResult);
 699                 CFNumberRef certAllowedErr = (CFNumberRef)CFDictionaryGetValue(tsDict,
 700                                                                                 kSecTrustSettingsAllowedError);
 701
 702                 /* now, skip if we find a constraint that doesn't match intended use */
 703                 if(!tsCheckPolicy(policyOID, certPolicy)) {
 704                         continue;
 705                 }
 706                 if(!tsCheckApp(certApp)) {
 707                         continue;
 708                 }
 709                 if(!tsCheckKeyUse(keyUsage, certKeyUsage)) {
 710                         continue;
 711                 }
 712                 if(!tsCheckPolicyStr(policyStr, certPolicyStr)) {
 713                         continue;
 714                 }
 715
 716                 trustSettingsEvalDbg("evaluateCert: MATCH");
 717                 foundSettings = true;
 718
 719                 if(certAllowedErr) {
 720                         /* note we already validated this value */
 721                         SInt32 s;
 722                         CFNumberGetValue(certAllowedErr, kCFNumberSInt32Type, &s);
 723                         allowedErrs = (CSSM_RETURN *)::realloc(allowedErrs,
 724                                 ++numAllowedErrs * sizeof(CSSM_RETURN));
 725                         allowedErrs[numAllowedErrs-1] = (CSSM_RETURN) s;
 726                 }
 727
 728                 /*
 729                  * We found a match, but we only return the current result type
 730                  * to caller if we haven't already returned something other than
 731                  * kSecTrustSettingsResultUnspecified. Once we find a valid result type,
 732                  * we keep on searching, but only for additional allowed errors.
 733                  */
 734                 switch(returnedResult) {
 735                         /* found match but no valid resultType yet */
 736                         case kSecTrustSettingsResultUnspecified:
 737                         /* haven't been thru here */
 738                         case kSecTrustSettingsResultInvalid:
 739                                 if(certResultType) {
 740                                         /* note we already validated this */
 741                                         SInt32 s;
 742                                         CFNumberGetValue(certResultType, kCFNumberSInt32Type, &s);
 743                                         returnedResult = (SecTrustSettingsResult)s;
 744                                 }
 745                                 else {
 746                                         /* default is "copacetic" */
 747                                         returnedResult = kSecTrustSettingsResultTrustRoot;
 748                                 }
 749                                 break;
 750                         default:
 751                                 /* we already have a definitive resultType, don't change it */
 752                                 break;
 753                 }
 754         }       /* for each dictionary in trustSettings */
 755
 756         *allowedErrors = allowedErrs;
 757         *numAllowedErrors = numAllowedErrs;
 758         if(returnedResult != kSecTrustSettingsResultInvalid) {
 759                 *resultType = returnedResult;
 760         }
 761         return foundSettings;
 762 }
 763
 764
 765 /*
 766  * Find all certs in specified keychain list which have entries in this trust record.
 767  * Certs already in the array are not added.
 768  */
 769 void TrustSettings::findCerts(
 770         StorageManager::KeychainList    &keychains,
 771         CFMutableArrayRef                               certArray)
 772 {
 773         findQualifiedCerts(keychains,
 774                 true,           /* findAll */
 775                 false,          /* onlyRoots */
 776                 NULL, NULL, kSecTrustSettingsKeyUseAny,
 777                 certArray);
 778 }
 779
 780 void TrustSettings::findQualifiedCerts(
 781         StorageManager::KeychainList    &keychains,
 782         /*
 783          * If findAll is true, all certs are returned and the subsequent
 784          * qualifiers are ignored
 785          */
 786         bool                                                    findAll,
 787         /* if true, only return root (self-signed) certs */
 788         bool                                                    onlyRoots,
 789         const CSSM_OID                                  *policyOID,                     /* optional */
 790         const char                                              *policyString,          /* optional */
 791         SecTrustSettingsKeyUsage                keyUsage,                       /* optional */
 792         CFMutableArrayRef                               certArray)                      /* certs appended here */
 793 {
 794         StLock<Mutex> _(SecTrustKeychainsGetMutex());
 795
 796         /*
 797          * a set, hopefully with a good hash function for CFData, to keep track of what's
 798          * been added to the outgoing array.
 799          */
 800         CFRef<CFMutableSetRef> certSet(CFSetCreateMutable(NULL, 0, &kCFTypeSetCallBacks));
 801
 802         /* search: all certs, no attributes */
 803         KCCursor cursor(keychains, CSSM_DL_DB_RECORD_X509_CERTIFICATE, NULL);
 804         Item certItem;
 805         bool found;
 806         do {
 807                 found = cursor->next(certItem);
 808                 if(!found) {
 809                         break;
 810                 }
 811                 CFRef<SecCertificateRef> certRef((SecCertificateRef)certItem->handle());
 812
 813                 /* do we have an entry for this cert? */
 814                 CFDictionaryRef certDict = findDictionaryForCert(certRef);
 815                 if(certDict == NULL) {
 816                         continue;
 817                 }
 818
 819                 if(!findAll) {
 820                         /* qualify */
 821                         if(!qualifyUsageWithCertDict(certDict, policyOID,
 822                                         policyString, keyUsage, onlyRoots)) {
 823                                 continue;
 824                         }
 825                 }
 826
 827                 /* see if we already have this one - get in CFData form */
 828                 CSSM_DATA certData;
 829                 OSStatus ortn = SecCertificateGetData(certRef, &certData);
 830                 if(ortn) {
 831                         trustSettingsEvalDbg("findQualifiedCerts: SecCertificateGetData error");
 832                         continue;
 833                 }
 834                 CFRef<CFDataRef> cfData(CFDataCreate(NULL, certData.Data, certData.Length));
 835                 CFDataRef cfd = cfData;
 836                 if(CFSetContainsValue(certSet, cfd)) {
 837                         trustSettingsEvalDbg("findQualifiedCerts: dup cert");
 838                         continue;
 839                 }
 840                 else {
 841                         /* add to the tracking set, which owns the CFData now */
 842                         CFSetAddValue(certSet, cfd);
 843                         /* and add the SecCert to caller's array, which owns that now */
 844                         CFArrayAppendValue(certArray, certRef);
 845                 }
 846         } while(found);
 847 }
 848
 849 /*
 850  * Obtain trust settings for the specified cert. Returned settings array
 851  * is in the public API form; caller must release. Returns NULL
 852  * (does not throw) if the cert is not present in this TrustRecord.
 853  */
 854 CFArrayRef TrustSettings::copyTrustSettings(
 855         SecCertificateRef       certRef)
 856 {
 857         CFDictionaryRef certDict = NULL;
 858
 859         /* find the on-disk usage constraints for this cert */
 860         certDict = findDictionaryForCert(certRef);
 861         if(certDict == NULL) {
 862                 trustSettingsDbg("copyTrustSettings: dictionary not found");
 863                 return NULL;
 864         }
 865         CFArrayRef diskTrustSettings = (CFArrayRef)CFDictionaryGetValue(certDict,
 866                 kTrustRecordTrustSettings);
 867         CFIndex numSpecs = 0;
 868         if(diskTrustSettings != NULL) {
 869                 /* this field is optional */
 870                 numSpecs = CFArrayGetCount(diskTrustSettings);
 871         }
 872
 873         /*
 874          * Convert to API-style array of dictionaries.
 875          * We give the caller an array even if it's empty.
 876          */
 877         CFRef<CFMutableArrayRef> outArray(CFArrayCreateMutable(NULL, numSpecs,
 878                 &kCFTypeArrayCallBacks));
 879         for(CFIndex dex=0; dex<numSpecs; dex++) {
 880                 CFDictionaryRef diskTsDict =
 881                         (CFDictionaryRef)CFArrayGetValueAtIndex(diskTrustSettings, dex);
 882                 /* already validated... */
 883                 assert(CFGetTypeID(diskTsDict) == CFDictionaryGetTypeID());
 884
 885                 CFDataRef   certPolicy = (CFDataRef)  CFDictionaryGetValue(diskTsDict, kSecTrustSettingsPolicy);
 886                 CFDataRef   certApp    = (CFDataRef)  CFDictionaryGetValue(diskTsDict, kSecTrustSettingsApplication);
 887                 CFStringRef policyStr  = (CFStringRef)CFDictionaryGetValue(diskTsDict, kSecTrustSettingsPolicyString);
 888                 CFNumberRef allowedErr = (CFNumberRef)CFDictionaryGetValue(diskTsDict, kSecTrustSettingsAllowedError);
 889                 CFNumberRef resultType = (CFNumberRef)CFDictionaryGetValue(diskTsDict, kSecTrustSettingsResult);
 890                 CFNumberRef keyUsage   = (CFNumberRef)CFDictionaryGetValue(diskTsDict, kSecTrustSettingsKeyUsage);
 891
 892                 if((certPolicy == NULL) &&
 893                    (certApp == NULL) &&
 894                    (policyStr == NULL) &&
 895                    (allowedErr == NULL) &&
 896                    (resultType == NULL) &&
 897                    (keyUsage == NULL)) {
 898                         /* weird but legal */
 899                         continue;
 900                 }
 901                 CFRef<CFMutableDictionaryRef> outTsDict(CFDictionaryCreateMutable(NULL,
 902                         0,                      // capacity
 903                         &kCFTypeDictionaryKeyCallBacks,
 904                         &kCFTypeDictionaryValueCallBacks));
 905
 906                 if(certPolicy != NULL) {
 907                         /* convert OID as CFDataRef to SecPolicyRef */
 908                         SecPolicyRef policyRef = NULL;
 909                         CSSM_OID policyOid = { CFDataGetLength(certPolicy),
 910                                 (uint8 *)CFDataGetBytePtr(certPolicy) };
 911                         OSStatus ortn = SecPolicyCopy(CSSM_CERT_X_509v3, &policyOid, &policyRef);
 912                         if(ortn) {
 913                                 trustSettingsDbg("copyTrustSettings: OID conversion error");
 914                                 abort("Bad Policy OID in trusted root list", errSecInvalidTrustedRootRecord);
 915                         }
 916                         CFDictionaryAddValue(outTsDict, kSecTrustSettingsPolicy, policyRef);
 917                         CFRelease(policyRef);                   // owned by dictionary
 918                 }
 919
 920                 if(certApp != NULL) {
 921                         /* convert app as CFDataRef to SecTrustedApplicationRef */
 922                         SecTrustedApplicationRef appRef;
 923                         OSStatus ortn = SecTrustedApplicationCreateWithExternalRepresentation(certApp, &appRef);
 924                         if(ortn) {
 925                                 trustSettingsDbg("copyTrustSettings: App conversion error");
 926                                 abort("Bad application data in trusted root list", errSecInvalidTrustedRootRecord);
 927                         }
 928                         CFDictionaryAddValue(outTsDict, kSecTrustSettingsApplication, appRef);
 929                         CFRelease(appRef);                      // owned by dictionary
 930                 }
 931
 932                 /* remaining 4 are trivial */
 933                 if(policyStr != NULL) {
 934                         /*
 935                          * copy, since policyStr is in our mutable dictionary and could change out from
 936                          * under the caller
 937                          */
 938                         CFStringRef str = CFStringCreateCopy(NULL, policyStr);
 939                         CFDictionaryAddValue(outTsDict, kSecTrustSettingsPolicyString, str);
 940                         CFRelease(str);                 // owned by dictionary
 941                 }
 942                 if(allowedErr != NULL) {
 943                         /* there is no mutable CFNumber, so.... */
 944                         CFDictionaryAddValue(outTsDict, kSecTrustSettingsAllowedError, allowedErr);
 945                 }
 946                 if(resultType != NULL) {
 947                         CFDictionaryAddValue(outTsDict, kSecTrustSettingsResult, resultType);
 948                 }
 949                 if(keyUsage != NULL) {
 950                         CFDictionaryAddValue(outTsDict, kSecTrustSettingsKeyUsage, keyUsage);
 951                 }
 952                 CFArrayAppendValue(outArray, outTsDict);
 953                 /* outTsDict autoreleases; owned by outArray now */
 954         }
 955         CFRetain(outArray);             // now that it's good to go....
 956         return outArray;
 957 }
 958
 959 CFDateRef TrustSettings::copyModDate(
 960         SecCertificateRef       certRef)
 961 {
 962         CFDictionaryRef certDict = NULL;
 963
 964         /* find the on-disk usage constraints dictionary for this cert */
 965         certDict = findDictionaryForCert(certRef);
 966         if(certDict == NULL) {
 967                 trustSettingsDbg("copyModDate: dictionary not found");
 968                 return NULL;
 969         }
 970         CFDateRef modDate = (CFDateRef)CFDictionaryGetValue(certDict, kTrustRecordModDate);
 971         if(modDate == NULL) {
 972                 return NULL;
 973         }
 974
 975         /* this only works becuase there is no mutable CFDateRef */
 976         CFRetain(modDate);
 977         return modDate;
 978 }
 979
 980 /*
 981  * Modify cert's trust settings, or add a new cert to the record.
 982  */
 983 void TrustSettings::setTrustSettings(
 984         SecCertificateRef       certRef,
 985         CFTypeRef                       trustSettingsDictOrArray)
 986 {
 987         /* to validate, we need to know if the cert is self-signed */
 988         OSStatus ortn;
 989         Boolean isSelfSigned = false;
 990
 991         if(certRef == kSecTrustSettingsDefaultRootCertSetting) {
 992                 /*
 993                  * Validate settings as if this were root, specifically,
 994                  * kSecTrustSettingsResultTrustRoot (explicitly or by
 995                  * default) is OK.
 996                  */
 997                 isSelfSigned = true;
 998         }
 999         else {
1000                 ortn = SecCertificateIsSelfSigned(certRef, &isSelfSigned);
1001                 if(ortn) {
1002                         MacOSError::throwMe(ortn);
1003                 }
1004         }
1005
1006         /* caller's app/policy spec OK? */
1007         CFRef<CFArrayRef> trustSettings(validateApiTrustSettings(
1008                 trustSettingsDictOrArray, isSelfSigned));
1009
1010         /* caller is responsible for ensuring these */
1011         assert(mPropList != NULL);
1012         assert(mDomain != kSecTrustSettingsDomainSystem);
1013
1014         /* extract issuer and serial number from the cert, if it's a cert */
1015         CFRef<CFDataRef> issuer;
1016         CFRef<CFDataRef> serial;
1017         if(certRef != kSecTrustSettingsDefaultRootCertSetting) {
1018                 copyIssuerAndSerial(certRef, issuer.take(), serial.take());
1019         }
1020         else {
1021                 UInt8 dummy;
1022                 issuer = CFDataCreate(NULL, &dummy, 0);
1023                 serial = CFDataCreate(NULL, &dummy, 0);
1024         }
1025
1026         /* SHA1 digest as string */
1027         CFRef<CFStringRef> certHashStr(SecTrustSettingsCertHashStrFromCert(certRef));
1028         if(!certHashStr) {
1029                 trustSettingsDbg("TrustSettings::setTrustSettings: CertHashStrFromCert error");
1030                 MacOSError::throwMe(errSecItemNotFound);
1031         }
1032
1033         /*
1034          * Find entry for this cert, if present.
1035          */
1036         CFMutableDictionaryRef certDict =
1037                 (CFMutableDictionaryRef)findDictionaryForCertHash(certHashStr);
1038         if(certDict == NULL) {
1039                 /* create new dictionary */
1040                 certDict = CFDictionaryCreateMutable(NULL, kSecTrustRecordNumCertDictKeys,
1041                         &kCFCopyStringDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks);
1042                 if(certDict == NULL) {
1043                         MacOSError::throwMe(errSecAllocate);
1044                 }
1045                 CFDictionaryAddValue(certDict, kTrustRecordIssuer, issuer);
1046                 CFDictionaryAddValue(certDict, kTrustRecordSerialNumber, serial);
1047                 if(CFArrayGetCount(trustSettings) != 0) {
1048                         /* skip this if the settings array is empty */
1049                         CFDictionaryAddValue(certDict, kTrustRecordTrustSettings, trustSettings);
1050                 }
1051                 tsSetModDate(certDict);
1052
1053                 /* add this new cert dictionary to top-level mTrustDict */
1054                 CFDictionaryAddValue(mTrustDict, static_cast<CFStringRef>(certHashStr), certDict);
1055
1056                 /* mTrustDict owns the dictionary now */
1057                 CFRelease(certDict);
1058         }
1059         else {
1060                 /* update */
1061                 tsSetModDate(certDict);
1062                 if(CFArrayGetCount(trustSettings) != 0) {
1063                         CFDictionarySetValue(certDict, kTrustRecordTrustSettings, trustSettings);
1064                 }
1065                 else {
1066                         /* empty settings array: remove from dictionary */
1067                         CFDictionaryRemoveValue(certDict, kTrustRecordTrustSettings);
1068                 }
1069         }
1070         mDirty = true;
1071 }
1072
1073 /*
1074  * Delete a certificate's trust settings.
1075  */
1076 void TrustSettings::deleteTrustSettings(
1077         SecCertificateRef       certRef)
1078 {
1079         CFDictionaryRef certDict = NULL;
1080
1081         /* caller is responsible for ensuring these */
1082         assert(mPropList != NULL);
1083         assert(mDomain != kSecTrustSettingsDomainSystem);
1084
1085         /* SHA1 digest as string */
1086         CFRef<CFStringRef> certHashStr(SecTrustSettingsCertHashStrFromCert(certRef));
1087         if(!certHashStr) {
1088                 MacOSError::throwMe(errSecItemNotFound);
1089         }
1090
1091         /* present in top-level mTrustDict? */
1092         certDict = findDictionaryForCertHash(certHashStr);
1093         if(certDict != NULL) {
1094                 CFDictionaryRemoveValue(mTrustDict, static_cast<CFStringRef>(certHashStr));
1095                 mDirty = true;
1096         }
1097         else {
1098                 /*
1099                  * Throwing this error is the only reason we don't blindly do
1100                  * a CFDictionaryRemoveValue() without first doing
1101                  * findDictionaryForCertHash().
1102                  */
1103                 trustSettingsDbg("TrustSettings::deleteRoot: cert dictionary not found");
1104                 MacOSError::throwMe(errSecItemNotFound);
1105         }
1106 }
1107
1108 #pragma mark --- Private methods ---
1109
1110 /*
1111  * Find a given cert's entry in the top-level mTrustDict. Return the
1112  * entry as a dictionary. Returned dictionary is not refcounted.
1113  * The mutability of the returned dictionary is the same as the mutability
1114  * of the underlying StickRecord::mPropList, which the caller is just
1115  * going to have to know (and cast accordingly if a mutable dictionary
1116  * is needed).
1117  */
1118 CFDictionaryRef TrustSettings::findDictionaryForCert(
1119         SecCertificateRef       certRef)
1120 {
1121         CFRef<CFStringRef> certHashStr(SecTrustSettingsCertHashStrFromCert(certRef));
1122         if (certHashStr.get() == NULL)
1123         {
1124                 return NULL;
1125         }
1126
1127         return findDictionaryForCertHash(static_cast<CFStringRef>(certHashStr));
1128 }
1129
1130 /*
1131  * Find entry in mTrustDict given cert hash string.
1132  */
1133 CFDictionaryRef TrustSettings::findDictionaryForCertHash(
1134         CFStringRef             certHashStr)
1135 {
1136         assert(mTrustDict != NULL);
1137         return (CFDictionaryRef)CFDictionaryGetValue(mTrustDict, certHashStr);
1138 }
1139
1140 /*
1141  * Validate incoming trust settings, which may be NULL, a dictionary, or
1142  * an array of dictionaries. Convert from the API-style dictionaries
1143  * to the internal style suitable for writing to disk as part of
1144  * mPropList.
1145  *
1146  * We return a refcounted CFArray in any case if the incoming parameter is good.
1147  */
1148 CFArrayRef TrustSettings::validateApiTrustSettings(
1149         CFTypeRef trustSettingsDictOrArray,
1150         Boolean isSelfSigned)
1151 {
1152         CFArrayRef tmpInArray = NULL;
1153
1154         if(trustSettingsDictOrArray == NULL) {
1155                 /* trivial case, only valid for roots */
1156                 if(!isSelfSigned) {
1157                         trustSettingsDbg("validateApiUsageConstraints: !isSelfSigned, no settings");
1158                         MacOSError::throwMe(errSecParam);
1159                 }
1160                 return CFArrayCreate(NULL, NULL, 0, &kCFTypeArrayCallBacks);
1161         }
1162         else if(CFGetTypeID(trustSettingsDictOrArray) == CFDictionaryGetTypeID()) {
1163                 /* array-ize it */
1164                 tmpInArray = CFArrayCreate(NULL, &trustSettingsDictOrArray, 1,
1165                         &kCFTypeArrayCallBacks);
1166         }
1167         else if(CFGetTypeID(trustSettingsDictOrArray) == CFArrayGetTypeID()) {
1168                 /* as is, refcount - we'll release later */
1169                 tmpInArray = (CFArrayRef)trustSettingsDictOrArray;
1170                 CFRetain(tmpInArray);
1171         }
1172         else {
1173                 trustSettingsDbg("validateApiUsageConstraints: bad trustSettingsDictOrArray");
1174                 MacOSError::throwMe(errSecParam);
1175         }
1176
1177         CFIndex numSpecs = CFArrayGetCount(tmpInArray);
1178         CFMutableArrayRef outArray = CFArrayCreateMutable(NULL, numSpecs, &kCFTypeArrayCallBacks);
1179         CSSM_OID oid;
1180         OSStatus ortn = errSecSuccess;
1181         SecPolicyRef certPolicy;
1182         SecTrustedApplicationRef certApp;
1183
1184         /* convert */
1185         for(CFIndex dex=0; dex<numSpecs; dex++) {
1186                 CFDataRef   oidData = NULL;
1187                 CFDataRef   appData = NULL;
1188                 CFStringRef policyStr = NULL;
1189                 CFNumberRef allowedErr = NULL;
1190                 CFNumberRef resultType = NULL;
1191                 CFNumberRef keyUsage = NULL;
1192                 SInt32 resultNum;
1193                 SecTrustSettingsResult result;
1194
1195                 /* each element is a dictionary */
1196                 CFDictionaryRef ucDict = (CFDictionaryRef)CFArrayGetValueAtIndex(tmpInArray, dex);
1197                 if(CFGetTypeID(ucDict) != CFDictionaryGetTypeID()) {
1198                         trustSettingsDbg("validateAppPolicyArray: malformed usageConstraint dictionary");
1199                         ortn = errSecParam;
1200                         break;
1201                 }
1202
1203                 /* policy - optional */
1204                 certPolicy = (SecPolicyRef)CFDictionaryGetValue(ucDict, kSecTrustSettingsPolicy);
1205                 if(certPolicy != NULL) {
1206                         if(CFGetTypeID(certPolicy) != SecPolicyGetTypeID()) {
1207                                 trustSettingsDbg("validateAppPolicyArray: malformed certPolicy");
1208                                 ortn = errSecParam;
1209                                 break;
1210                         }
1211                         ortn = SecPolicyGetOID(certPolicy, &oid);
1212                         if(ortn) {
1213                                 trustSettingsDbg("validateAppPolicyArray: SecPolicyGetOID error");
1214                                 break;
1215                         }
1216                         oidData = CFDataCreate(NULL, oid.Data, oid.Length);
1217                 }
1218
1219                 /* application - optional */
1220                 certApp = (SecTrustedApplicationRef)CFDictionaryGetValue(ucDict, kSecTrustSettingsApplication);
1221                 if(certApp != NULL) {
1222                         if(CFGetTypeID(certApp) != SecTrustedApplicationGetTypeID()) {
1223                                 trustSettingsDbg("validateAppPolicyArray: malformed certApp");
1224                                 ortn = errSecParam;
1225                                 break;
1226                         }
1227                         ortn = SecTrustedApplicationCopyExternalRepresentation(certApp, &appData);
1228                         if(ortn) {
1229                                 trustSettingsDbg("validateAppPolicyArray: "
1230                                         "SecTrustedApplicationCopyExternalRepresentation error");
1231                                 break;
1232                         }
1233                 }
1234
1235                 policyStr  = (CFStringRef)CFDictionaryGetValue(ucDict, kSecTrustSettingsPolicyString);
1236                 if(policyStr != NULL) {
1237                         if(CFGetTypeID(policyStr) != CFStringGetTypeID()) {
1238                                 trustSettingsDbg("validateAppPolicyArray: malformed policyStr");
1239                                 ortn = errSecParam;
1240                                 break;
1241                         }
1242                 }
1243                 allowedErr = (CFNumberRef)CFDictionaryGetValue(ucDict, kSecTrustSettingsAllowedError);
1244                 if(!tsIsGoodCfNum(allowedErr)) {
1245                         trustSettingsDbg("validateAppPolicyArray: malformed allowedErr");
1246                         ortn = errSecParam;
1247                         break;
1248                 }
1249                 resultType = (CFNumberRef)CFDictionaryGetValue(ucDict, kSecTrustSettingsResult);
1250                 if(!tsIsGoodCfNum(resultType, &resultNum)) {
1251                         trustSettingsDbg("validateAppPolicyArray: malformed resultType");
1252                         ortn = errSecParam;
1253                         break;
1254                 }
1255                 result = resultNum;
1256                 /* validate result later */
1257
1258                 keyUsage   = (CFNumberRef)CFDictionaryGetValue(ucDict, kSecTrustSettingsKeyUsage);
1259                 if(!tsIsGoodCfNum(keyUsage)) {
1260                         trustSettingsDbg("validateAppPolicyArray: malformed keyUsage");
1261                         ortn = errSecParam;
1262                         break;
1263                 }
1264
1265                 if(!oidData && !appData && !policyStr &&
1266                    !allowedErr && !resultType && !keyUsage) {
1267                         /* nothing here - weird, but legal - skip it */
1268                         continue;
1269                 }
1270
1271                 /* create dictionary for this usageConstraint */
1272                 CFMutableDictionaryRef outDict = CFDictionaryCreateMutable(NULL,
1273                         2,
1274                         &kCFTypeDictionaryKeyCallBacks,
1275                         &kCFTypeDictionaryValueCallBacks);
1276                 if(oidData) {
1277                         CFDictionaryAddValue(outDict, kSecTrustSettingsPolicy, oidData);
1278                         CFRelease(oidData);                     // owned by dictionary
1279                 }
1280                 if(appData) {
1281                         CFDictionaryAddValue(outDict, kSecTrustSettingsApplication, appData);
1282                         CFRelease(appData);                     // owned by dictionary
1283                 }
1284                 if(policyStr) {
1285                         CFDictionaryAddValue(outDict, kSecTrustSettingsPolicyString, policyStr);
1286                         /* still owned by ucDict */
1287                 }
1288                 if(allowedErr) {
1289                         CFDictionaryAddValue(outDict, kSecTrustSettingsAllowedError, allowedErr);
1290                 }
1291                 if(resultType) {
1292                         /* let's be really picky on this one */
1293                         switch(result) {
1294                                 case kSecTrustSettingsResultInvalid:
1295                                         ortn = errSecParam;
1296                                         break;
1297                                 case kSecTrustSettingsResultTrustRoot:
1298                                         if(!isSelfSigned) {
1299                                                 trustSettingsDbg("validateAppPolicyArray: TrustRoot, !isSelfSigned");
1300                                                 ortn = errSecParam;
1301                                         }
1302                                         break;
1303                                 case kSecTrustSettingsResultTrustAsRoot:
1304                                         if(isSelfSigned) {
1305                                                 trustSettingsDbg("validateAppPolicyArray: TrustAsRoot, isSelfSigned");
1306                                                 ortn = errSecParam;
1307                                         }
1308                                         break;
1309                                 case kSecTrustSettingsResultDeny:
1310                                 case kSecTrustSettingsResultUnspecified:
1311                                         break;
1312                                 default:
1313                                         trustSettingsDbg("validateAppPolicyArray: bogus resultType");
1314                                         ortn = errSecParam;
1315                                         break;
1316                         }
1317                         if(ortn) {
1318                                 break;
1319                         }
1320                         CFDictionaryAddValue(outDict, kSecTrustSettingsResult, resultType);
1321                 }
1322                 else {
1323                         /* no resultType; default of TrustRoot only valid for root */
1324                         if(!isSelfSigned) {
1325                                 trustSettingsDbg("validateAppPolicyArray: default result, !isSelfSigned");
1326                                 ortn = errSecParam;
1327                                 break;
1328                         }
1329                 }
1330                 if(keyUsage) {
1331                         CFDictionaryAddValue(outDict, kSecTrustSettingsKeyUsage, keyUsage);
1332                 }
1333
1334                 /* append dictionary to output */
1335                 CFArrayAppendValue(outArray, outDict);
1336                 /* array owns the dictionary now */
1337                 CFRelease(outDict);
1338
1339         }       /* for each usage constraint dictionary */
1340
1341         CFRelease(tmpInArray);
1342         if(ortn) {
1343                 CFRelease(outArray);
1344                 MacOSError::throwMe(ortn);
1345         }
1346         return outArray;
1347 }
1348
1349 /*
1350  * Validate an trust settings array obtained from disk.
1351  * Returns true if OK, else returns false.
1352  */
1353 bool TrustSettings::validateTrustSettingsArray(
1354         CFArrayRef trustSettings)
1355 {
1356         CFIndex numSpecs = CFArrayGetCount(trustSettings);
1357         for(CFIndex dex=0; dex<numSpecs; dex++) {
1358                 CFDictionaryRef ucDict = (CFDictionaryRef)CFArrayGetValueAtIndex(trustSettings,
1359                         dex);
1360                 if(CFGetTypeID(ucDict) != CFDictionaryGetTypeID()) {
1361                         trustSettingsDbg("validateAppPolicyArray: malformed app/policy dictionary");
1362                         return false;
1363                 }
1364                 CFDataRef certPolicy = (CFDataRef)CFDictionaryGetValue(ucDict, kSecTrustSettingsPolicy);
1365                 if((certPolicy != NULL) && (CFGetTypeID(certPolicy) != CFDataGetTypeID())) {
1366                         trustSettingsDbg("validateAppPolicyArray: malformed certPolicy");
1367                         return false;
1368                 }
1369                 CFDataRef certApp = (CFDataRef)CFDictionaryGetValue(ucDict, kSecTrustSettingsApplication);
1370                 if((certApp != NULL) && (CFGetTypeID(certApp) != CFDataGetTypeID())) {
1371                         trustSettingsDbg("validateAppPolicyArray: malformed certApp");
1372                         return false;
1373                 }
1374                 CFStringRef policyStr = (CFStringRef)CFDictionaryGetValue(ucDict, kSecTrustSettingsPolicyString);
1375                 if((policyStr != NULL) && (CFGetTypeID(policyStr) != CFStringGetTypeID())) {
1376                         trustSettingsDbg("validateAppPolicyArray: malformed policyStr");
1377                         return false;
1378                 }
1379                 CFNumberRef cfNum = (CFNumberRef)CFDictionaryGetValue(ucDict, kSecTrustSettingsAllowedError);
1380                 if(!tsIsGoodCfNum(cfNum)) {
1381                         trustSettingsDbg("validateAppPolicyArray: malformed allowedErr");
1382                         return false;
1383                 }
1384                 cfNum = (CFNumberRef)CFDictionaryGetValue(ucDict, kSecTrustSettingsResult);
1385                 if(!tsIsGoodCfNum(cfNum)) {
1386                         trustSettingsDbg("validateAppPolicyArray: malformed resultType");
1387                         return false;
1388                 }
1389                 cfNum = (CFNumberRef)CFDictionaryGetValue(ucDict, kSecTrustSettingsKeyUsage);
1390                 if(!tsIsGoodCfNum(cfNum)) {
1391                         trustSettingsDbg("validateAppPolicyArray: malformed keyUsage");
1392                         return false;
1393                 }
1394         }       /* for each usageConstraint dictionary */
1395         return true;
1396 }
1397
1398 /*
1399  * Validate mPropList after it's read from disk or supplied as an external
1400  * representation. Allows subsequent use of mTrustDict to proceed with
1401  * relative impunity.
1402  */
1403 void TrustSettings::validatePropList(bool trim)
1404 {
1405         /* top level dictionary */
1406         if(!mPropList) {
1407                 trustSettingsDbg("TrustSettings::validatePropList missing mPropList");
1408                 abort("missing propList", errSecInvalidTrustedRootRecord);
1409         }
1410
1411         if(CFGetTypeID(mPropList) != CFDictionaryGetTypeID()) {
1412                 trustSettingsDbg("TrustSettings::validatePropList: malformed mPropList");
1413                 abort("malformed propList", errSecInvalidTrustedRootRecord);
1414         }
1415
1416         /* That dictionary has two entries */
1417         CFNumberRef cfVers = (CFNumberRef)CFDictionaryGetValue(mPropList, kTrustRecordVersion);
1418         if((cfVers == NULL) || (CFGetTypeID(cfVers) != CFNumberGetTypeID())) {
1419                 trustSettingsDbg("TrustSettings::validatePropList: malformed version");
1420                 abort("malformed version", errSecInvalidTrustedRootRecord);
1421         }
1422         if(!CFNumberGetValue(cfVers, kCFNumberSInt32Type, &mDictVersion)) {
1423                 trustSettingsDbg("TrustSettings::validatePropList: malformed version");
1424                 abort("malformed version", errSecInvalidTrustedRootRecord);
1425         }
1426         if((mDictVersion > kSecTrustRecordVersionCurrent) ||
1427            (mDictVersion == kSecTrustRecordVersionInvalid)) {
1428                 trustSettingsDbg("TrustSettings::validatePropList: incompatible version");
1429                 abort("incompatible version", errSecInvalidTrustedRootRecord);
1430         }
1431         /* other backwards-compatibility handling done later, if needed, per mDictVersion */
1432
1433         mTrustDict = (CFMutableDictionaryRef)CFDictionaryGetValue(mPropList, kTrustRecordTrustList);
1434         if(mTrustDict != NULL) {
1435                 CFRetain(mTrustDict);
1436         }
1437         if((mTrustDict == NULL) || (CFGetTypeID(mTrustDict) != CFDictionaryGetTypeID())) {
1438                 trustSettingsDbg("TrustSettings::validatePropList: malformed mTrustDict");
1439                 abort("malformed TrustArray", errSecInvalidTrustedRootRecord);
1440         }
1441
1442         /* grind through the per-cert entries */
1443         CFIndex numCerts = CFDictionaryGetCount(mTrustDict);
1444         const void *dictKeys[numCerts];
1445         const void *dictValues[numCerts];
1446         CFDictionaryGetKeysAndValues(mTrustDict, dictKeys, dictValues);
1447
1448         for(CFIndex dex=0; dex<numCerts; dex++) {
1449                 /* get per-cert dictionary */
1450                 CFMutableDictionaryRef certDict = (CFMutableDictionaryRef)dictValues[dex];
1451                 if((certDict == NULL) || (CFGetTypeID(certDict) != CFDictionaryGetTypeID())) {
1452                         trustSettingsDbg("TrustSettings::validatePropList: malformed certDict");
1453                         abort("malformed certDict", errSecInvalidTrustedRootRecord);
1454                 }
1455
1456                 /*
1457                  * That dictionary has exactly four entries.
1458                  * If we're trimming, all we need is the actual trust settings.
1459                  */
1460
1461                 /* issuer */
1462                 CFDataRef cfd = (CFDataRef)CFDictionaryGetValue(certDict, kTrustRecordIssuer);
1463                 if(cfd == NULL) {
1464                         trustSettingsDbg("TrustSettings::validatePropList: missing issuer");
1465                         abort("missing issuer", errSecInvalidTrustedRootRecord);
1466                 }
1467                 if(CFGetTypeID(cfd) != CFDataGetTypeID()) {
1468                         trustSettingsDbg("TrustSettings::validatePropList: malformed issuer");
1469                         abort("malformed issuer", errSecInvalidTrustedRootRecord);
1470                 }
1471                 if(trim) {
1472                         CFDictionaryRemoveValue(certDict, kTrustRecordIssuer);
1473                 }
1474
1475                 /* serial number */
1476                 cfd = (CFDataRef)CFDictionaryGetValue(certDict, kTrustRecordSerialNumber);
1477                 if(cfd == NULL) {
1478                         trustSettingsDbg("TrustSettings::validatePropList: missing serial number");
1479                         abort("missing serial number", errSecInvalidTrustedRootRecord);
1480                 }
1481                 if(CFGetTypeID(cfd) != CFDataGetTypeID()) {
1482                         trustSettingsDbg("TrustSettings::validatePropList: malformed serial number");
1483                         abort("malformed serial number", errSecInvalidTrustedRootRecord);
1484                 }
1485                 if(trim) {
1486                         CFDictionaryRemoveValue(certDict, kTrustRecordSerialNumber);
1487                 }
1488
1489                 /* modification date */
1490                 CFDateRef modDate = (CFDateRef)CFDictionaryGetValue(certDict, kTrustRecordModDate);
1491                 if(modDate == NULL) {
1492                         trustSettingsDbg("TrustSettings::validatePropList: missing modDate");
1493                         abort("missing modDate", errSecInvalidTrustedRootRecord);
1494                 }
1495                 if(CFGetTypeID(modDate) != CFDateGetTypeID()) {
1496                         trustSettingsDbg("TrustSettings::validatePropList: malformed modDate");
1497                         abort("malformed modDate", errSecInvalidTrustedRootRecord);
1498                 }
1499                 if(trim) {
1500                         CFDictionaryRemoveValue(certDict, kTrustRecordModDate);
1501                 }
1502
1503                 /* the actual trust settings */
1504                 CFArrayRef trustSettings = (CFArrayRef)CFDictionaryGetValue(certDict,
1505                                 kTrustRecordTrustSettings);
1506                 if(trustSettings == NULL) {
1507                         /* optional; this cert's entry is good */
1508                         continue;
1509                 }
1510                 if(CFGetTypeID(trustSettings) != CFArrayGetTypeID()) {
1511                         trustSettingsDbg("TrustSettings::validatePropList: malformed useConstraint"
1512                                 "array");
1513                         abort("malformed useConstraint array", errSecInvalidTrustedRootRecord);
1514                 }
1515
1516                 /* Now validate the usageConstraint array contents */
1517                 if(!validateTrustSettingsArray(trustSettings)) {
1518                         abort("malformed useConstraint array", errSecInvalidTrustedRootRecord);
1519                 }
1520         } /* for each cert dictionary  in top-level array */
1521
1522         if(trim) {
1523                 /* we don't need the top-level dictionary any more */
1524                 CFRelease(mPropList);
1525                 mPropList = NULL;
1526         }
1527 }
1528
1529 /*
1530  * Obtain non-normalized issuer and serial number for specified cert, both
1531  * returned as CFDataRefs owned by caller.
1532  */
1533 void TrustSettings::copyIssuerAndSerial(
1534         SecCertificateRef       certRef,
1535         CFDataRef                       *issuer,                /* optional, RETURNED */
1536         CFDataRef                       *serial)                /* RETURNED */
1537 {
1538         SecPointer<Certificate> cert = Certificate::required(certRef);
1539         CSSM_DATA_PTR fieldVal;
1540
1541         if(issuer != NULL) {
1542                 fieldVal = cert->copyFirstFieldValue(CSSMOID_X509V1IssuerNameStd);
1543                 *issuer = CFDataCreate(NULL, fieldVal->Data, fieldVal->Length);
1544                 cert->releaseFieldValue(CSSMOID_X509V1IssuerNameStd, fieldVal);
1545         }
1546
1547         fieldVal = cert->copyFirstFieldValue(CSSMOID_X509V1SerialNumber);
1548         *serial = CFDataCreate(NULL, fieldVal->Data, fieldVal->Length);
1549         cert->releaseFieldValue(CSSMOID_X509V1SerialNumber, fieldVal);
1550 }
1551
1552 void TrustSettings::abort(
1553         const char *why,
1554         OSStatus err)
1555 {
1556         Syslog::error("TrustSettings: %s", why);
1557         MacOSError::throwMe(err);
1558 }
1559