OSX/sec/SOSCircle/SecureObjectSync/SOSPeerInfo.c

   1 /*
   2  * Copyright (c) 2012-2014 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 #include <AssertMacros.h>
  26 #include <TargetConditionals.h>
  27
  28 #include <Security/SecureObjectSync/SOSPeerInfo.h>
  29 #include <Security/SecureObjectSync/SOSPeerInfoInternal.h>
  30 #include <Security/SecureObjectSync/SOSPeerInfoPriv.h>
  31 #include <Security/SecureObjectSync/SOSPeerInfoV2.h>
  32 #include <Security/SecureObjectSync/SOSCircle.h>
  33 #include <Security/SecureObjectSync/SOSAccountPriv.h>
  34 #include <Security/SecureObjectSync/SOSInternal.h>
  35 #include <ipc/securityd_client.h>
  36
  37 #include <CoreFoundation/CFArray.h>
  38 #include <dispatch/dispatch.h>
  39
  40 #include <stdlib.h>
  41 #include <assert.h>
  42
  43 #include <utilities/SecCFWrappers.h>
  44 #include <utilities/SecCFRelease.h>
  45 #include <utilities/SecCFError.h>
  46 #include <utilities/SecXPCError.h>
  47
  48 #include <utilities/der_plist.h>
  49 #include <utilities/der_plist_internal.h>
  50 #include <corecrypto/ccder.h>
  51 #include <utilities/der_date.h>
  52
  53 #include <corecrypto/ccdigest.h>
  54 #include <corecrypto/ccsha2.h>
  55
  56
  57 #include <CoreFoundation/CoreFoundation.h>
  58 #include <CoreFoundation/CFDate.h>
  59
  60 #include <xpc/xpc.h>
  61
  62 #if TARGET_OS_IPHONE || TARGET_OS_EMBEDDED
  63 #include <MobileGestalt.h>
  64 #endif
  65
  66 #include <Security/SecBase64.h>
  67 #include <Security/SecKeyPriv.h>
  68 #include <Security/SecOTR.h>
  69 #include <Security/SecuritydXPC.h>
  70
  71 CFGiblisWithHashFor(SOSPeerInfo);
  72
  73
  74 const CFStringRef kPIUserDefinedDeviceNameKey   = CFSTR("ComputerName");
  75 const CFStringRef kPIDeviceModelNameKey         = CFSTR("ModelName");
  76 const CFStringRef kPIMessageProtocolVersionKey  = CFSTR("MessageProtocolVersion");
  77 const CFStringRef kPIOSVersionKey               = CFSTR("OSVersion");
  78
  79 // Description Dictionary Entries
  80 static CFStringRef sPublicKeyKey        = CFSTR("PublicSigningKey");
  81 const CFStringRef sGestaltKey          = CFSTR("DeviceGestalt");
  82 const CFStringRef sVersionKey          = CFSTR("ConflictVersion");
  83 static CFStringRef sCloudIdentityKey    = CFSTR("CloudIdentity");
  84 static CFStringRef sApplicationDate     = CFSTR("ApplicationDate");
  85 static CFStringRef sApplicationUsig     = CFSTR("ApplicationUsig");
  86 static CFStringRef sRetirementDate      = CFSTR("RetirementDate");
  87
  88 // Peerinfo Entries
  89 CFStringRef kSOSPeerInfoDescriptionKey = CFSTR("SOSPeerInfoDescription");
  90 CFStringRef kSOSPeerInfoSignatureKey = CFSTR("SOSPeerInfoSignature");
  91 CFStringRef kSOSPeerInfoNameKey = CFSTR("SOSPeerInfoName");
  92
  93 //Peer Info V2 Dictionary IDS keys
  94 CFStringRef sPreferIDS                  = CFSTR("PreferIDS");
  95 CFStringRef sTransportType              = CFSTR("TransportType");
  96 CFStringRef sDeviceID                   = CFSTR("DeviceID");
  97
  98 const CFStringRef peerIDLengthKey             = CFSTR("idLength");
  99
 100 SOSPeerInfoRef SOSPeerInfoAllocate(CFAllocatorRef allocator) {
 101     return  CFTypeAllocate(SOSPeerInfo, struct __OpaqueSOSPeerInfo, allocator);
 102 }
 103
 104 SecKeyRef SOSPeerInfoCopyPubKey(SOSPeerInfoRef peer) {
 105     CFDataRef pubKeyBytes = CFDictionaryGetValue(peer->description, sPublicKeyKey);
 106     if (pubKeyBytes == NULL)
 107         return NULL;
 108     CFAllocatorRef allocator = CFGetAllocator(peer);
 109     SecKeyRef pubKey = SecKeyCreateFromPublicData(allocator, kSecECDSAAlgorithmID, pubKeyBytes);
 110     return pubKey;
 111 }
 112
 113 CFDataRef SOSPeerInfoGetAutoAcceptInfo(SOSPeerInfoRef peer) {
 114         CFDataRef pubKeyBytes = NULL;
 115
 116         pubKeyBytes = CFDictionaryGetValue(peer->description, sPublicKeyKey);
 117         if (!pubKeyBytes || CFGetTypeID(pubKeyBytes) != CFDataGetTypeID()) {
 118                 pubKeyBytes = NULL;
 119         }
 120
 121         return pubKeyBytes;
 122 }
 123
 124 static bool SOSDescriptionHash(SOSPeerInfoRef peer, const struct ccdigest_info *di, void *hashresult, CFErrorRef *error) {
 125     ccdigest_di_decl(di, ctx);
 126     ccdigest_init(di, ctx);
 127     void *ctx_p = ctx;
 128     if(!SOSPeerInfoUpdateDigestWithDescription(peer, di, ctx_p, error)) return false;
 129     ccdigest_final(di, ctx, hashresult);
 130     return true;
 131 }
 132
 133
 134 #define SIGLEN 128
 135 static CFDataRef sosSignHash(SecKeyRef privkey, const struct ccdigest_info *di, uint8_t *hbuf) {
 136     OSStatus stat;
 137     size_t siglen = SIGLEN;
 138     uint8_t sig[siglen];
 139     if((stat = SecKeyRawSign(privkey, kSecPaddingNone, hbuf, di->output_size, sig, &siglen)) != 0) {
 140         return NULL;
 141     }
 142     return CFDataCreate(NULL, sig, (CFIndex)siglen);
 143 }
 144
 145 static bool sosVerifyHash(SecKeyRef pubkey, const struct ccdigest_info *di, uint8_t *hbuf, CFDataRef signature) {
 146     return SecKeyRawVerify(pubkey, kSecPaddingNone, hbuf, di->output_size,
 147                            CFDataGetBytePtr(signature), CFDataGetLength(signature)) == errSecSuccess;
 148 }
 149
 150 bool SOSPeerInfoSign(SecKeyRef privKey, SOSPeerInfoRef peer, CFErrorRef *error) {
 151     bool status = false;
 152     const struct ccdigest_info *di = ccsha256_di();
 153     uint8_t hbuf[di->output_size];
 154     CFDataRef newSignature = NULL;
 155
 156     require_action_quiet(SOSDescriptionHash(peer, di, hbuf, error), fail,
 157                          SOSCreateError(kSOSErrorUnexpectedType, CFSTR("Failed to hash description for peer"), NULL, error));
 158
 159     newSignature = sosSignHash(privKey, di, hbuf);
 160     require_action_quiet(newSignature, fail, SOSCreateError(kSOSErrorUnexpectedType, CFSTR("Failed to sign peerinfo for peer"), NULL, error));
 161
 162     CFReleaseNull(peer->signature);
 163     peer->signature = newSignature;
 164     newSignature = NULL;
 165     status = true;
 166
 167 fail:
 168     CFReleaseNull(newSignature);
 169     return status;
 170 }
 171
 172 // Return true (1) if the signature verifies.
 173 bool SOSPeerInfoVerify(SOSPeerInfoRef peer, CFErrorRef *error) {
 174     bool result = false;
 175     const struct ccdigest_info *di = ccsha256_di();
 176     uint8_t hbuf[di->output_size];
 177
 178     SecKeyRef pubKey = SOSPeerInfoCopyPubKey(peer);
 179     require_action_quiet(pubKey, error_out,
 180                          SOSErrorCreate(kSOSErrorNoKey, error, NULL,
 181                                         CFSTR("Couldn't find pub key for %@"), peer));
 182
 183     require_quiet(SOSDescriptionHash(peer, di, hbuf, error), error_out);
 184
 185     require_action_quiet(sosVerifyHash(pubKey, di, hbuf, peer->signature), error_out,
 186                          SOSErrorCreate(kSOSErrorBadSignature, error, NULL,
 187                                         CFSTR("Signature didn't verify for %@"), peer));
 188     result = true;
 189
 190 error_out:
 191     CFReleaseNull(pubKey);
 192     return result;
 193 }
 194
 195 void SOSPeerInfoSetVersionNumber(SOSPeerInfoRef pi, int version) {
 196     pi->version = version;
 197     CFNumberRef versionNumber = CFNumberCreateWithCFIndex(NULL, pi->version);
 198     CFDictionarySetValue(pi->description, sVersionKey,   versionNumber);
 199     CFReleaseNull(versionNumber);
 200 }
 201
 202 static SOSPeerInfoRef SOSPeerInfoCreate_Internal(CFAllocatorRef allocator,
 203                                                  CFDictionaryRef gestalt, CFDataRef backup_key,
 204                                                  CFStringRef IDSID, CFStringRef transportType, CFBooleanRef preferIDS,
 205                                                  CFSetRef enabledViews,
 206                                                  SecKeyRef signingKey, CFErrorRef* error,
 207                                                  void (^ description_modifier)(CFMutableDictionaryRef description)) {
 208     SOSPeerInfoRef pi = CFTypeAllocate(SOSPeerInfo, struct __OpaqueSOSPeerInfo, allocator);
 209     pi->gestalt = gestalt;
 210     CFRetain(pi->gestalt);
 211
 212     pi->version = SOSPeerInfoGetPeerProtocolVersion(pi);
 213     CFDataRef publicBytes = NULL;
 214     CFNumberRef versionNumber = NULL;
 215
 216     SecKeyRef publicKey = SecKeyCreatePublicFromPrivate(signingKey);
 217     if (publicKey == NULL) {
 218         SOSCreateError(kSOSErrorBadKey, CFSTR("Unable to get public"), NULL, error);
 219         CFReleaseNull(pi);
 220         goto exit;
 221     }
 222
 223     OSStatus result = SecKeyCopyPublicBytes(publicKey, &publicBytes);
 224
 225     if (result != errSecSuccess) {
 226         SOSCreateError(kSOSErrorBadKey, CFSTR("Failed to export public bytes"), NULL, error);
 227         CFReleaseNull(pi);
 228         goto exit;
 229     }
 230
 231     pi->signature = CFDataCreateMutable(allocator, 0);
 232
 233     versionNumber = CFNumberCreateWithCFIndex(NULL, pi->version);
 234
 235     pi->description = CFDictionaryCreateMutableForCFTypesWith(allocator,
 236                                                               sVersionKey,   versionNumber,
 237                                                               sPublicKeyKey, publicBytes,
 238                                                               sGestaltKey,   pi->gestalt,
 239                                                               NULL);
 240
 241     description_modifier(pi->description);
 242
 243
 244     pi->id = SOSCopyIDOfKey(publicKey, error);
 245     CFReleaseNull(publicKey);
 246
 247     require_quiet(pi->id, exit);
 248
 249     // ================ V2 Additions Start
 250
 251     if(!SOSPeerInfoUpdateToV2(pi, error)) {
 252         CFReleaseNull(pi);
 253         goto exit;
 254     }
 255
 256     // V2DictionarySetValue handles NULL as remove
 257     SOSPeerInfoV2DictionarySetValue(pi, sBackupKeyKey, backup_key);
 258     SOSPeerInfoV2DictionarySetValue(pi, sDeviceID, IDSID);
 259     SOSPeerInfoV2DictionarySetValue(pi, sTransportType, transportType);
 260     SOSPeerInfoV2DictionarySetValue(pi, sPreferIDS, preferIDS);
 261
 262     SOSPeerInfoV2DictionarySetValue(pi, sViewsKey, enabledViews);
 263
 264     // ================ V2 Additions End
 265
 266     if (!SOSPeerInfoSign(signingKey, pi, error)) {
 267         CFReleaseNull(pi);
 268         goto exit;
 269     }
 270
 271 exit:
 272     CFReleaseNull(versionNumber);
 273     CFReleaseNull(publicBytes);
 274     return pi;
 275 }
 276
 277 SOSPeerInfoRef SOSPeerInfoCreate(CFAllocatorRef allocator, CFDictionaryRef gestalt, CFDataRef backup_key, SecKeyRef signingKey, CFErrorRef* error) {
 278     return SOSPeerInfoCreate_Internal(allocator, gestalt, backup_key, NULL, NULL, NULL, NULL, signingKey, error, ^(CFMutableDictionaryRef description) {});
 279 }
 280
 281 SOSPeerInfoRef SOSPeerInfoCreateWithTransportAndViews(CFAllocatorRef allocator, CFDictionaryRef gestalt, CFDataRef backup_key,
 282                                                       CFStringRef IDSID, CFStringRef transportType, CFBooleanRef preferIDS,
 283                                                       CFSetRef enabledViews,
 284                                                       SecKeyRef signingKey, CFErrorRef* error)
 285 {
 286     return SOSPeerInfoCreate_Internal(allocator, gestalt, backup_key, IDSID, transportType, preferIDS, enabledViews, signingKey, error, ^(CFMutableDictionaryRef description) {});
 287 }
 288
 289
 290 SOSPeerInfoRef SOSPeerInfoCreateCloudIdentity(CFAllocatorRef allocator, CFDictionaryRef gestalt, SecKeyRef signingKey, CFErrorRef* error) {
 291     return SOSPeerInfoCreate_Internal(allocator, gestalt, NULL, NULL, NULL, NULL, NULL, signingKey, error, ^(CFMutableDictionaryRef description) {
 292         CFDictionarySetValue(description, sCloudIdentityKey, kCFBooleanTrue);
 293     });
 294
 295 }
 296
 297
 298 SOSPeerInfoRef SOSPeerInfoCreateCopy(CFAllocatorRef allocator, SOSPeerInfoRef toCopy, CFErrorRef* error) {
 299     if(!toCopy) return NULL;
 300     SOSPeerInfoRef pi = CFTypeAllocate(SOSPeerInfo, struct __OpaqueSOSPeerInfo, allocator);
 301
 302     pi->description = CFDictionaryCreateMutableCopy(allocator, 0, toCopy->description);
 303     pi->signature = CFDataCreateCopy(allocator, toCopy->signature);
 304
 305     pi->gestalt = CFDictionaryCreateCopy(allocator, toCopy->gestalt);
 306     pi->id = CFStringCreateCopy(allocator, toCopy->id);
 307
 308     pi->version = toCopy->version;
 309     if(!SOSPeerInfoVersionHasV2Data(pi)) SOSPeerInfoExpandV2Data(pi, error);
 310
 311     return pi;
 312 }
 313
 314
 315 bool SOSPeerInfoVersionIsCurrent(SOSPeerInfoRef pi) {
 316     return pi->version >= PEERINFO_CURRENT_VERSION;
 317 }
 318
 319 bool SOSPeerInfoVersionHasV2Data(SOSPeerInfoRef pi) {
 320     return pi->version >= kSOSPeerV2BaseVersion;
 321 }
 322
 323 SOSPeerInfoRef SOSPeerInfoCreateCurrentCopy(CFAllocatorRef allocator, SOSPeerInfoRef toCopy,
 324                                             CFStringRef IDSID, CFStringRef transportType, CFBooleanRef preferIDS, CFSetRef enabledViews,
 325                                             SecKeyRef signingKey, CFErrorRef* error) {
 326
 327     SOSPeerInfoRef pi = SOSPeerInfoCreateCopy(allocator, toCopy, error);
 328     if(!SOSPeerInfoVersionHasV2Data(pi)) SOSPeerInfoUpdateToV2(pi, error);
 329
 330     SOSPeerInfoSetSerialNumber(pi);
 331
 332     if (IDSID) {
 333         SOSPeerInfoV2DictionarySetValue(pi, sDeviceID, IDSID);
 334     }
 335     if (transportType) {
 336         SOSPeerInfoV2DictionarySetValue(pi, sTransportType, transportType);
 337     }
 338     if (preferIDS) {
 339         SOSPeerInfoV2DictionarySetValue(pi, sPreferIDS, preferIDS);
 340     }
 341     if (enabledViews) {
 342         SOSPeerInfoV2DictionarySetValue(pi, sViewsKey, enabledViews);
 343     }
 344
 345     if(!SOSPeerInfoSign(signingKey, pi, error)) {
 346         CFReleaseNull(pi);
 347     }
 348
 349     return pi;
 350 }
 351
 352
 353 static SOSPeerInfoRef SOSPeerInfoCopyWithModification(CFAllocatorRef allocator, SOSPeerInfoRef original,
 354                                                       SecKeyRef signingKey, CFErrorRef *error,
 355                                                       bool (^modification)(SOSPeerInfoRef peerToModify, CFErrorRef *error)) {
 356
 357     SOSPeerInfoRef result = NULL;
 358     SOSPeerInfoRef copy = SOSPeerInfoCreateCopy(allocator, original, error);
 359
 360     require_quiet(modification(copy, error), fail);
 361
 362     require_quiet(SOSPeerInfoSign(signingKey, copy, error), fail);
 363
 364     CFTransferRetained(result, copy);
 365
 366 fail:
 367     CFReleaseNull(copy);
 368     return result;
 369
 370 }
 371
 372 SOSPeerInfoRef SOSPeerInfoCopyWithGestaltUpdate(CFAllocatorRef allocator, SOSPeerInfoRef toCopy, CFDictionaryRef gestalt, SecKeyRef signingKey, CFErrorRef* error) {
 373     return SOSPeerInfoCopyWithModification(allocator, toCopy, signingKey, error,
 374                                            ^bool(SOSPeerInfoRef peerToModify, CFErrorRef *error) {
 375         if(!gestalt || !peerToModify) return false;
 376         CFRetainAssign(peerToModify->gestalt, gestalt);
 377         CFDictionarySetValue(peerToModify->description, sGestaltKey, peerToModify->gestalt);
 378         return true;
 379
 380     });
 381 }
 382
 383
 384 SOSPeerInfoRef SOSPeerInfoCopyWithBackupKeyUpdate(CFAllocatorRef allocator, SOSPeerInfoRef toCopy, CFDataRef backupKey, SecKeyRef signingKey, CFErrorRef *error) {
 385     return SOSPeerInfoCopyWithModification(allocator, toCopy, signingKey, error,
 386                                            ^bool(SOSPeerInfoRef peerToModify, CFErrorRef *error) {
 387         if (backupKey != NULL)
 388             SOSPeerInfoV2DictionarySetValue(peerToModify, sBackupKeyKey, backupKey);
 389         else
 390             SOSPeerInfoV2DictionaryRemoveValue(peerToModify, sBackupKeyKey);
 391         return true;
 392     });
 393 }
 394
 395 static CFDictionaryRef SOSPeerInfoUpdateAndCopyRecord(SOSPeerInfoRef peer, CFStringRef dsid, CFDictionaryRef escrowRecord){
 396
 397     CFMutableDictionaryRef existingEscrowRecords = SOSPeerInfoCopyEscrowRecord(peer);
 398
 399     if(escrowRecord == NULL && existingEscrowRecords != NULL)
 400     {
 401         CFDictionaryRemoveValue(existingEscrowRecords, dsid);
 402         return existingEscrowRecords;
 403     }
 404
 405     if(existingEscrowRecords == NULL)
 406         existingEscrowRecords = CFDictionaryCreateMutableForCFTypes(kCFAllocatorDefault);
 407
 408     CFDictionarySetValue(existingEscrowRecords, dsid, escrowRecord);
 409
 410     return existingEscrowRecords;
 411 }
 412
 413
 414 SOSPeerInfoRef SOSPeerInfoCopyWithEscrowRecordUpdate(CFAllocatorRef allocator, SOSPeerInfoRef toCopy, CFStringRef dsid, CFDictionaryRef escrowRecord, SecKeyRef signingKey, CFErrorRef *error) {
 415     return SOSPeerInfoCopyWithModification(allocator, toCopy, signingKey, error,
 416                                            ^bool(SOSPeerInfoRef peerToModify, CFErrorRef *error) {
 417
 418             CFDictionaryRef updatedEscrowRecords = SOSPeerInfoUpdateAndCopyRecord(peerToModify, dsid, escrowRecord);
 419             SOSPeerInfoV2DictionarySetValue(peerToModify, sEscrowRecord, updatedEscrowRecords);
 420             CFReleaseNull(updatedEscrowRecords);
 421             return true;
 422     });
 423 }
 424
 425 SOSPeerInfoRef SOSPeerInfoCopyWithReplacedEscrowRecords(CFAllocatorRef allocator, SOSPeerInfoRef toCopy, CFDictionaryRef escrowRecords, SecKeyRef signingKey, CFErrorRef *error) {
 426     return SOSPeerInfoCopyWithModification(allocator, toCopy, signingKey, error,
 427                                            ^bool(SOSPeerInfoRef peerToModify, CFErrorRef *error) {
 428             if(escrowRecords != NULL)
 429                 SOSPeerInfoV2DictionarySetValue(peerToModify, sEscrowRecord, escrowRecords);
 430
 431             return true;
 432     });
 433 }
 434
 435 CFDataRef SOSPeerInfoCopyBackupKey(SOSPeerInfoRef peer) {
 436     return SOSPeerInfoV2DictionaryCopyData(peer, sBackupKeyKey);
 437 }
 438
 439 CFMutableDictionaryRef SOSPeerInfoCopyEscrowRecord(SOSPeerInfoRef peer){
 440     return SOSPeerInfoV2DictionaryCopyDictionary(peer, sEscrowRecord);
 441 }
 442
 443 bool SOSPeerInfoHasBackupKey(SOSPeerInfoRef peer) {
 444     CFDataRef bk = SOSPeerInfoCopyBackupKey(peer);
 445     bool success = bk != NULL;
 446     CFReleaseNull(bk);
 447     return success;
 448 }
 449
 450 SOSPeerInfoRef SOSPeerInfoCopyWithViewsChange(CFAllocatorRef allocator, SOSPeerInfoRef toCopy,
 451                                               SOSViewActionCode action, CFStringRef viewname, SOSViewResultCode *retval,
 452                                               SecKeyRef signingKey, CFErrorRef* error) {
 453     SOSPeerInfoRef pi = SOSPeerInfoCreateCopy(allocator, toCopy, error);
 454     if(action == kSOSCCViewEnable) {
 455         *retval = SOSViewsEnable(pi, viewname, error);
 456         require((kSOSCCViewMember == *retval), exit);
 457     } else if(action == kSOSCCViewDisable) {
 458         *retval = SOSViewsDisable(pi, viewname, error);
 459         require((kSOSCCViewNotMember == *retval), exit);
 460     }
 461
 462     require_action_quiet(SOSPeerInfoSign(signingKey, pi, error), exit, *retval = kSOSCCGeneralViewError);
 463     return pi;
 464
 465 exit:
 466     CFReleaseNull(pi);
 467     return NULL;
 468 }
 469
 470
 471 CFStringRef sPingKey                   = CFSTR("Ping");
 472
 473 SOSPeerInfoRef SOSPeerInfoCopyWithPing(CFAllocatorRef allocator, SOSPeerInfoRef toCopy, SecKeyRef signingKey, CFErrorRef* error) {
 474     SOSPeerInfoRef pi = SOSPeerInfoCreateCopy(allocator, toCopy, error);
 475     CFDataRef ping = CFDataCreateWithRandomBytes(8);
 476     SOSPeerInfoV2DictionarySetValue(pi, sPingKey, ping);
 477     SecKeyRef pub_key = SOSPeerInfoCopyPubKey(pi);
 478     pi->id = SOSCopyIDOfKey(pub_key, error);
 479     require_quiet(pi->id, exit);
 480     require_action_quiet(SOSPeerInfoSign(signingKey, pi, error), exit, CFReleaseNull(pi));
 481 exit:
 482     CFReleaseNull(ping);
 483     CFReleaseNull(pub_key);
 484     return pi;
 485 }
 486
 487
 488 SOSViewResultCode SOSPeerInfoViewStatus(SOSPeerInfoRef pi, CFStringRef view, CFErrorRef *error) {
 489     return SOSViewsQuery(pi, view, error);
 490 }
 491
 492
 493 SOSPeerInfoRef SOSPeerInfoCopyWithSecurityPropertyChange(CFAllocatorRef allocator, SOSPeerInfoRef toCopy,
 494                                                          SOSSecurityPropertyActionCode action, CFStringRef property, SOSSecurityPropertyResultCode *retval,
 495                                                          SecKeyRef signingKey, CFErrorRef* error) {
 496     SOSPeerInfoRef pi = SOSPeerInfoCreateCopy(allocator, toCopy, error);
 497     if(action == kSOSCCSecurityPropertyEnable) {
 498         *retval = SOSSecurityPropertyEnable(pi, property, error);
 499         require((kSOSCCSecurityPropertyValid == *retval), exit);
 500     } else if(action == kSOSCCSecurityPropertyDisable) {
 501         *retval = SOSSecurityPropertyDisable(pi, property, error);
 502         require((kSOSCCSecurityPropertyNotValid == *retval), exit);
 503     }
 504
 505     require_action_quiet(SOSPeerInfoSign(signingKey, pi, error), exit, *retval = kSOSCCGeneralViewError);
 506     return pi;
 507
 508 exit:
 509     CFReleaseNull(pi);
 510     return NULL;
 511 }
 512
 513 SOSViewResultCode SOSPeerInfoSecurityPropertyStatus(SOSPeerInfoRef pi, CFStringRef property, CFErrorRef *error) {
 514         return SOSSecurityPropertyQuery(pi, property, error);
 515     }
 516
 517
 518
 519 static void SOSPeerInfoDestroy(CFTypeRef aObj) {
 520     SOSPeerInfoRef pi = (SOSPeerInfoRef) aObj;
 521
 522     if(!pi) return;
 523     CFReleaseNull(pi->description);
 524     CFReleaseNull(pi->signature);
 525     CFReleaseNull(pi->gestalt);
 526     CFReleaseNull(pi->id);
 527     CFReleaseNull(pi->v2Dictionary);
 528     CFReleaseNull(pi->secproperties);
 529 }
 530
 531 static Boolean SOSPeerInfoCompare(CFTypeRef lhs, CFTypeRef rhs) {
 532     SOSPeerInfoRef lpeer = (SOSPeerInfoRef) lhs;
 533     SOSPeerInfoRef rpeer = (SOSPeerInfoRef) rhs;
 534     if(!lpeer || !rpeer) return false;
 535     return CFEqualSafe(lpeer->description, rpeer->description) && CFEqualSafe(lpeer->signature, rpeer->signature);
 536 }
 537
 538
 539 CFComparisonResult SOSPeerInfoCompareByID(const void *val1, const void *val2, void *context) {
 540     // The code below is necessary but not sufficient; not returning a CFComparisonResult
 541     // It probably is OK to say that a NULL is <  <non-NULL>
 542     if (val1 == NULL || val2 == NULL) {
 543             ptrdiff_t dv = val1 - val2;
 544                 return dv < 0 ? kCFCompareLessThan : dv == 0 ? kCFCompareEqualTo : kCFCompareGreaterThan;
 545     }
 546
 547         CFStringRef v1 = SOSPeerInfoGetPeerID((SOSPeerInfoRef) val1);
 548         CFStringRef v2 = SOSPeerInfoGetPeerID((SOSPeerInfoRef) val2);
 549     if (v1 == NULL || v2 == NULL) {
 550             ptrdiff_t dv = (const void *)v1 - (const void *)v2;
 551         return dv < 0 ? kCFCompareLessThan : dv == 0 ? kCFCompareEqualTo : kCFCompareGreaterThan;
 552     }
 553
 554     return CFStringCompare(v1, v2, 0);
 555 }
 556
 557 static CFHashCode SOSPeerInfoHash(CFTypeRef cf) {
 558     SOSPeerInfoRef peer = (SOSPeerInfoRef) cf;
 559
 560     return CFHash(peer->description) ^ CFHash(peer->signature);
 561 }
 562
 563 static CFStringRef copyDescriptionWithFormatOptions(CFTypeRef aObj, CFDictionaryRef formatOptions){
 564
 565     SOSPeerInfoRef pi = (SOSPeerInfoRef) aObj;
 566     CFStringRef description = NULL;
 567
 568
 569     // Get the format options we care about:
 570     CFNumberRef peerIDLengthNumber = formatOptions ? CFDictionaryGetValue(formatOptions, peerIDLengthKey) : NULL;
 571     bool useSyncDFormat = formatOptions && CFDictionaryContainsKey(formatOptions, CFSTR("SyncD"));
 572
 573     // Calculate the truncated length
 574     CFIndex truncatedLength = CFStringGetLength(pi->id);
 575     if (isNumber(peerIDLengthNumber)) {
 576         CFIndex peerIDMaximumLength = truncatedLength;
 577         CFNumberGetValue(peerIDLengthNumber, kCFNumberCFIndexType, &peerIDMaximumLength);
 578         truncatedLength = MIN(truncatedLength, peerIDMaximumLength);
 579     }
 580     CFStringRef displayPeerID = CFStringCreateWithSubstring(kCFAllocatorDefault, pi->id, CFRangeMake(0, truncatedLength));
 581
 582     CFStringRef objectPrefix = useSyncDFormat ? CFSTR("PI") :
 583                                                 CFStringCreateWithFormat(kCFAllocatorDefault, formatOptions, CFSTR("PeerInfo@%p"), pi);
 584
 585     CFStringRef osVersion = CFDictionaryGetValue(pi->gestalt, kPIOSVersionKey);
 586
 587     CFStringRef transportType = SOSPeerInfoV2DictionaryCopyString(pi, sTransportType);
 588     CFStringRef deviceID = SOSPeerInfoV2DictionaryCopyString(pi, sDeviceID);
 589
 590     description = CFStringCreateWithFormat(NULL, NULL, CFSTR("<%@: %s%s '%@' %@ %@ %@ %@ %@ %ld>"),
 591                                            objectPrefix,
 592                                            SOSPeerInfoIsRetirementTicket(pi) ? "R" : "-",
 593                                            SOSPeerInfoHasBackupKey(pi) ? "B" : "-",
 594                                            CFDictionaryGetValue(pi->gestalt, kPIUserDefinedDeviceNameKey),
 595                                            CFDictionaryGetValue(pi->gestalt, kPIDeviceModelNameKey),
 596                                            osVersion ? osVersion : CFSTR("????"),
 597                                            transportType ? transportType : CFSTR("KVS"),
 598                                            deviceID ? deviceID : CFSTR(""),
 599                                            displayPeerID,
 600                                            pi->version);
 601
 602     CFReleaseNull(transportType);
 603     CFReleaseNull(deviceID);
 604
 605     CFReleaseNull(objectPrefix);
 606     CFReleaseNull(displayPeerID);
 607
 608     return description;
 609 }
 610
 611 static CFStringRef SOSPeerInfoCopyFormatDescription(CFTypeRef aObj, CFDictionaryRef formatOptions) {
 612
 613     CFStringRef description = NULL;
 614
 615     description = copyDescriptionWithFormatOptions(aObj, formatOptions);
 616
 617     return description;
 618 }
 619
 620 CFDictionaryRef SOSPeerInfoCopyPeerGestalt(SOSPeerInfoRef pi) {
 621     CFRetain(pi->gestalt);
 622     return pi->gestalt;
 623 }
 624
 625 CFDictionaryRef SOSPeerGetGestalt(SOSPeerInfoRef pi){
 626     return pi->gestalt;
 627 }
 628
 629 CFStringRef SOSPeerInfoGetPeerName(SOSPeerInfoRef peer) {
 630     return SOSPeerInfoLookupGestaltValue(peer, kPIUserDefinedDeviceNameKey);
 631 }
 632
 633 CFStringRef SOSPeerInfoGetPeerDeviceType(SOSPeerInfoRef peer) {
 634     return SOSPeerInfoLookupGestaltValue(peer, kPIDeviceModelNameKey);
 635 }
 636
 637 CFIndex SOSPeerInfoGetPeerProtocolVersion(SOSPeerInfoRef peer) {
 638     CFIndex version = PEERINFO_CURRENT_VERSION;
 639     CFTypeRef val = SOSPeerInfoLookupGestaltValue(peer, kPIMessageProtocolVersionKey);
 640     if (val && CFGetTypeID(val) == CFNumberGetTypeID())
 641         CFNumberGetValue(val, kCFNumberCFIndexType, &version);
 642     return version;
 643 }
 644
 645 CFTypeRef SOSPeerInfoLookupGestaltValue(SOSPeerInfoRef pi, CFStringRef key) {
 646     return CFDictionaryGetValue(pi->gestalt, key);
 647 }
 648
 649 CFStringRef SOSPeerInfoGetPeerID(SOSPeerInfoRef pi) {
 650     return pi ? pi->id : NULL;
 651 }
 652
 653 bool SOSPeerInfoPeerIDEqual(SOSPeerInfoRef pi, CFStringRef myPeerID) {
 654     return CFEqualSafe(myPeerID, SOSPeerInfoGetPeerID(pi));
 655 }
 656
 657 CFIndex SOSPeerInfoGetVersion(SOSPeerInfoRef pi) {
 658     return pi->version;
 659 }
 660
 661 bool SOSPeerInfoUpdateDigestWithPublicKeyBytes(SOSPeerInfoRef peer, const struct ccdigest_info *di,
 662                                                ccdigest_ctx_t ctx, CFErrorRef *error) {
 663     CFDataRef pubKeyBytes = CFDictionaryGetValue(peer->description, sPublicKeyKey);
 664
 665     if(!pubKeyBytes) {
 666         SOSCreateErrorWithFormat(kSOSErrorEncodeFailure, NULL, error, NULL, CFSTR("Digest failed – no public key"));
 667         return false;
 668     }
 669
 670     ccdigest_update(di, ctx, CFDataGetLength(pubKeyBytes), CFDataGetBytePtr(pubKeyBytes));
 671
 672     return true;
 673 }
 674
 675 bool SOSPeerInfoUpdateDigestWithDescription(SOSPeerInfoRef peer, const struct ccdigest_info *di,
 676                                             ccdigest_ctx_t ctx, CFErrorRef *error) {
 677     if(SOSPeerInfoVersionHasV2Data(peer)) SOSPeerInfoPackV2Data(peer);
 678     size_t description_size = der_sizeof_plist(peer->description, error);
 679     uint8_t data_begin[description_size];
 680     uint8_t *data_end = data_begin + description_size;
 681     uint8_t *encoded = der_encode_plist(peer->description, error, data_begin, data_end);
 682
 683     if(!encoded) {
 684         SOSCreateErrorWithFormat(kSOSErrorEncodeFailure, NULL, error, NULL, CFSTR("Description encode failed"));
 685         return false;
 686     }
 687
 688     ccdigest_update(di, ctx, description_size, data_begin);
 689
 690     return true;
 691 }
 692
 693
 694 static CFDataRef sosCreateDate() {
 695     CFDateRef now = CFDateCreate(NULL, CFAbsoluteTimeGetCurrent());
 696     size_t bufsiz = der_sizeof_date(now, NULL);
 697     uint8_t buf[bufsiz];
 698     der_encode_date(now, NULL, buf, buf+bufsiz);
 699     CFReleaseNull(now);
 700     return CFDataCreate(NULL, buf, bufsiz);
 701 }
 702
 703 static CFDateRef sosCreateCFDate(CFDataRef sosdate) {
 704     CFDateRef date;
 705     der_decode_date(NULL, 0, &date, NULL, CFDataGetBytePtr(sosdate),
 706                     CFDataGetBytePtr(sosdate) + CFDataGetLength(sosdate));
 707     return date;
 708 }
 709
 710 static bool sospeer_application_hash(SOSPeerInfoRef pi, const struct ccdigest_info *di, uint8_t *hbuf) {
 711     CFDataRef appdate = CFDictionaryGetValue(pi->description, sApplicationDate);
 712     if(!appdate) return false;
 713     ccdigest_di_decl(di, ctx);
 714     ccdigest_init(di, ctx);
 715     ccdigest_update(di, ctx, CFDataGetLength(appdate), CFDataGetBytePtr(appdate));
 716     if (!SOSPeerInfoUpdateDigestWithPublicKeyBytes(pi, di, ctx, NULL)) return false;
 717     ccdigest_final(di, ctx, hbuf);
 718     return true;
 719 }
 720
 721 SOSPeerInfoRef SOSPeerInfoCopyAsApplication(SOSPeerInfoRef original, SecKeyRef userkey, SecKeyRef peerkey, CFErrorRef *error) {
 722     SOSPeerInfoRef result = NULL;
 723     SOSPeerInfoRef pi = SOSPeerInfoCreateCopy(kCFAllocatorDefault, original, error);
 724
 725     const struct ccdigest_info *di = ccsha256_di();
 726     uint8_t hbuf[di->output_size];
 727     CFDataRef usersig = NULL;
 728
 729     CFDataRef creationDate = sosCreateDate();
 730     CFDictionarySetValue(pi->description, sApplicationDate, creationDate);
 731     CFReleaseNull(creationDate);
 732
 733     // Create User Application Signature
 734     require_action_quiet(sospeer_application_hash(pi, di, hbuf), fail,
 735                          SOSCreateError(kSOSErrorUnexpectedType, CFSTR("Failed to create hash for peer applicant"), NULL, error));
 736
 737     usersig = sosSignHash(userkey, di, hbuf);
 738     require_action_quiet(usersig, fail,
 739                         SOSCreateError(kSOSErrorUnexpectedType, CFSTR("Failed to sign public key hash for peer"), NULL, error));
 740
 741     CFDictionarySetValue(pi->description, sApplicationUsig, usersig);
 742
 743     require_quiet(SOSPeerInfoSign(peerkey, pi, error), fail);
 744
 745     result = pi;
 746     pi = NULL;
 747
 748 fail:
 749     CFReleaseNull(usersig);
 750     CFReleaseNull(pi);
 751     return result;
 752 }
 753
 754 bool SOSPeerInfoApplicationVerify(SOSPeerInfoRef pi, SecKeyRef userkey, CFErrorRef *error) {
 755     const struct ccdigest_info *di = ccsha256_di();
 756     uint8_t hbuf[di->output_size];
 757     bool result = false;
 758
 759     CFDataRef usig = CFDictionaryGetValue(pi->description, sApplicationUsig);
 760     require_action_quiet(usig, exit,
 761                          SOSCreateError(kSOSErrorUnexpectedType, CFSTR("Peer is not an applicant"), NULL, error));
 762     // Verify User Application Signature
 763     require_action_quiet(sospeer_application_hash(pi, di, hbuf), exit,
 764                          SOSCreateError(kSOSErrorUnexpectedType, CFSTR("Failed to create hash for peer applicant"), NULL, error));
 765     require_action_quiet(sosVerifyHash(userkey, di, hbuf, usig), exit,
 766                          SOSCreateError(kSOSErrorUnexpectedType, CFSTR("user signature of public key hash fails to verify"), NULL, error));
 767
 768     result = SOSPeerInfoVerify(pi, error);
 769
 770 exit:
 771     return result;
 772 }
 773
 774
 775 static CF_RETURNS_RETAINED CFDateRef sosPeerInfoGetDate(SOSPeerInfoRef pi, CFStringRef entry) {
 776     if(!pi) return NULL;
 777     CFDataRef sosdate = CFDictionaryGetValue(pi->description, entry);
 778     if(!sosdate) return NULL;
 779     CFDateRef date = sosCreateCFDate(sosdate);
 780
 781     return date;
 782 }
 783
 784 CF_RETURNS_RETAINED CFDateRef SOSPeerInfoGetApplicationDate(SOSPeerInfoRef pi) {
 785     return sosPeerInfoGetDate(pi, sApplicationDate);
 786 }
 787
 788 CF_RETURNS_RETAINED CFDateRef SOSPeerInfoGetRetirementDate(SOSPeerInfoRef pi) {
 789     return sosPeerInfoGetDate(pi, sRetirementDate);
 790 }
 791
 792
 793
 794 //
 795 // Gestalt helpers
 796 //
 797
 798 CFStringRef SOSPeerGestaltGetName(CFDictionaryRef gestalt) {
 799     CFStringRef name = SOSPeerGestaltGetAnswer(gestalt, kPIUserDefinedDeviceNameKey);
 800     return isString(name) ? name : NULL;
 801 }
 802
 803 CFTypeRef SOSPeerGestaltGetAnswer(CFDictionaryRef gestalt, CFStringRef question) {
 804     return gestalt ? CFDictionaryGetValue(gestalt, question) : NULL;
 805 }
 806
 807 //
 808 // Peer Retirement
 809 //
 810
 811
 812 SOSPeerInfoRef SOSPeerInfoCreateRetirementTicket(CFAllocatorRef allocator, SecKeyRef privKey, SOSPeerInfoRef peer, CFErrorRef *error) {
 813     // Copy PeerInfo
 814     SOSPeerInfoRef pi = SOSPeerInfoCreateCopy(allocator, peer, error);
 815
 816     require(pi, fail);
 817
 818     // Fill out Resignation Date
 819     CFDataRef resignationDate = sosCreateDate();
 820     CFDictionaryAddValue(pi->description, sRetirementDate, resignationDate);
 821     CFReleaseNull(resignationDate);
 822
 823     require(SOSPeerInfoSign(privKey, pi, error), fail);
 824
 825     return pi;
 826
 827 fail:
 828     CFReleaseNull(pi);
 829     return NULL;
 830 }
 831
 832 CFStringRef SOSPeerInfoInspectRetirementTicket(SOSPeerInfoRef pi, CFErrorRef *error) {
 833     CFStringRef retval = NULL;
 834     CFDateRef now = CFDateCreate(NULL, CFAbsoluteTimeGetCurrent());
 835     CFDateRef retirement = NULL;
 836
 837     require_quiet(SOSPeerInfoVerify(pi, error), err);
 838
 839     retirement = sosCreateCFDate(CFDictionaryGetValue(pi->description, sRetirementDate));
 840
 841     require_action_quiet(retirement, err,
 842                          SOSCreateError(kSOSErrorUnexpectedType, CFSTR("Peer is not retired"), NULL, error));
 843
 844     require_action_quiet(CFDateCompare(now, retirement, NULL) == kCFCompareGreaterThan, err,
 845                          SOSCreateError(kSOSErrorUnexpectedType, CFSTR("Retirement date is after current date"), NULL, error));
 846
 847     retval = SOSPeerInfoGetPeerID(pi);
 848
 849 err:
 850     CFReleaseNull(now);
 851     CFReleaseNull(retirement);
 852     return retval;
 853 }
 854
 855 bool SOSPeerInfoRetireRetirementTicket(size_t max_seconds, SOSPeerInfoRef pi) {
 856     CFDateRef now = CFDateCreate(NULL, CFAbsoluteTimeGetCurrent());
 857     CFDateRef retirement = sosCreateCFDate(CFDictionaryGetValue(pi->description, sRetirementDate));
 858     CFTimeInterval timediff = CFDateGetTimeIntervalSinceDate(now, retirement); // diff in seconds
 859     CFReleaseNull(now);
 860     CFReleaseNull(retirement);
 861     if(timediff > (max_seconds)) return true;
 862     return false;
 863 }
 864
 865 bool SOSPeerInfoIsRetirementTicket(SOSPeerInfoRef pi) {
 866     CFDataRef flag = CFDictionaryGetValue(pi->description, sRetirementDate);
 867     return flag != NULL;
 868 }
 869
 870 bool SOSPeerInfoIsCloudIdentity(SOSPeerInfoRef pi) {
 871     CFTypeRef value = CFDictionaryGetValue(pi->description, sCloudIdentityKey);
 872     return CFEqualSafe(value, kCFBooleanTrue);
 873 }
 874
 875 SOSPeerInfoRef SOSPeerInfoUpgradeSignatures(CFAllocatorRef allocator, SecKeyRef privKey, SecKeyRef peerKey, SOSPeerInfoRef peer, CFErrorRef *error) {
 876     SecKeyRef pubKey = SecKeyCreatePublicFromPrivate(privKey);
 877     SOSPeerInfoRef retval = NULL;
 878
 879     retval = SOSPeerInfoCopyAsApplication(peer, privKey, peerKey, error);
 880     CFReleaseNull(pubKey);
 881     return retval;
 882 }
 883
 884 CFBooleanRef SOSPeerInfoCopyIDSPreference(SOSPeerInfoRef peer){
 885     CFBooleanRef preference = (CFBooleanRef)SOSPeerInfoV2DictionaryCopyBoolean(peer, sPreferIDS);
 886     return (preference ? preference : CFRetain(kCFBooleanFalse));
 887 }
 888
 889
 890 SOSPeerInfoRef SOSPeerInfoSetIDSPreference(CFAllocatorRef allocator, SOSPeerInfoRef toCopy, CFBooleanRef preference, SecKeyRef signingKey, CFErrorRef *error){
 891             return SOSPeerInfoCopyWithModification(allocator, toCopy, signingKey, error,
 892                                                ^bool(SOSPeerInfoRef peerToModify, CFErrorRef *error) {
 893                                                    SOSPeerInfoV2DictionarySetValue(peerToModify, sPreferIDS, preference);
 894                                                    return true;
 895                                                });
 896 }
 897
 898 CFStringRef SOSPeerInfoCopyTransportType(SOSPeerInfoRef peer){
 899     CFStringRef transportType = (CFStringRef)SOSPeerInfoV2DictionaryCopyString(peer, sTransportType);
 900     return (transportType ? transportType : CFRetain(SOSTransportMessageTypeKVS));
 901 }
 902
 903 SOSPeerInfoRef SOSPeerInfoSetTransportType(CFAllocatorRef allocator, SOSPeerInfoRef toCopy, CFStringRef transportType, SecKeyRef signingKey, CFErrorRef *error){
 904
 905     return SOSPeerInfoCopyWithModification(allocator, toCopy, signingKey, error,
 906                                            ^bool(SOSPeerInfoRef peerToModify, CFErrorRef *error) {
 907                                                SOSPeerInfoV2DictionarySetValue(peerToModify, sTransportType, transportType);
 908                                                return true;
 909                                            });
 910 }
 911
 912 bool SOSPeerInfoHasDeviceID(SOSPeerInfoRef peer) {
 913     return SOSPeerInfoV2DictionaryHasString(peer, sDeviceID);
 914 }
 915
 916 CFStringRef SOSPeerInfoCopyDeviceID(SOSPeerInfoRef peer){
 917     return (CFStringRef)SOSPeerInfoV2DictionaryCopyString(peer, sDeviceID);
 918 }
 919
 920 SOSPeerInfoRef SOSPeerInfoSetDeviceID(CFAllocatorRef allocator, SOSPeerInfoRef toCopy, CFStringRef IDS, SecKeyRef signingKey, CFErrorRef *error){
 921
 922     return SOSPeerInfoCopyWithModification(allocator, toCopy, signingKey, error,
 923                                            ^bool(SOSPeerInfoRef peerToModify, CFErrorRef *error) {
 924                                                SOSPeerInfoV2DictionarySetValue(peerToModify, sDeviceID, IDS);
 925                                                return true;
 926                                            });
 927 }
 928
 929 bool SOSPeerInfoShouldUseIDSTransport(SOSPeerInfoRef myPeer, SOSPeerInfoRef theirPeer){
 930
 931     CFBooleanRef myPreference = SOSPeerInfoCopyIDSPreference(myPeer);
 932     CFStringRef myTransportType = SOSPeerInfoCopyTransportType(myPeer);
 933
 934     CFBooleanRef theirPreference = SOSPeerInfoCopyIDSPreference(theirPeer);
 935     CFStringRef theirTransportType = SOSPeerInfoCopyTransportType(theirPeer);
 936
 937     bool success = false;
 938     //If I'm a galarch KVS + peer is KVS and ids only is true for both == KVS
 939     if((CFStringCompare(myTransportType, SOSTransportMessageTypeKVS, 0) == 0 && CFStringCompare(theirTransportType, SOSTransportMessageTypeKVS, 0) == 0)&& (myPreference == kCFBooleanTrue && theirPreference == kCFBooleanTrue))
 940         success = false;
 941
 942     //If transport is IDS Galarch +1 (Pref is true) and peer is KVS (ids is true) == IDS
 943     else if ((CFStringCompare(myTransportType, SOSTransportMessageTypeIDS, 0) == 0 && CFStringCompare(theirTransportType, SOSTransportMessageTypeKVS, 0) == 0) && (myPreference == kCFBooleanTrue && theirPreference == kCFBooleanTrue))
 944         success = true;
 945
 946     else if ((CFStringCompare(theirTransportType, SOSTransportMessageTypeIDS, 0) == 0 && CFStringCompare(myTransportType, SOSTransportMessageTypeKVS, 0) == 0) && (theirPreference == kCFBooleanTrue && myPreference == kCFBooleanTrue))
 947         success = true;
 948
 949     //If transport is IDS Galarch +1 and peer is IDS Galarch +1 (prefer IDS is true) == IDS
 950     else if ((CFStringCompare(myTransportType, SOSTransportMessageTypeIDS, 0) == 0 && CFStringCompare(theirTransportType, SOSTransportMessageTypeIDS, 0) == 0))
 951         success = true;
 952
 953     //If KVS and KVS prefer IDS is false (set to false or doesn't exist) == KVS
 954     else if ((CFStringCompare(myTransportType, SOSTransportMessageTypeKVS, 0) == 0 && CFStringCompare(theirTransportType, SOSTransportMessageTypeKVS, 0) == 0) && (myPreference == kCFBooleanFalse && theirPreference == kCFBooleanFalse))
 955         success = false;
 956
 957     else
 958         success = false;
 959
 960     CFReleaseSafe(myPreference);
 961     CFReleaseSafe(myTransportType);
 962     CFReleaseSafe(theirPreference);
 963     CFReleaseSafe(theirTransportType);
 964     return success;
 965 }