OSX/sec/ProjectHeaders/Security/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     if (backup_key != NULL)
 242         SOSPeerInfoV2DictionarySetValue(pi, sBackupKeyKey, backup_key);
 243
 244     description_modifier(pi->description);
 245
 246
 247     pi->id = SOSCopyIDOfKey(publicKey, error);
 248     CFReleaseNull(publicKey);
 249
 250     require_quiet(pi->id, exit);
 251
 252     // ================ V2 Additions Start
 253
 254     if(!SOSPeerInfoUpdateToV2(pi, error)) {
 255         CFReleaseNull(pi);
 256         goto exit;
 257     }
 258
 259     // V2DictionarySetValue handles NULL as remove
 260     SOSPeerInfoV2DictionarySetValue(pi, sBackupKeyKey, backup_key);
 261     SOSPeerInfoV2DictionarySetValue(pi, sDeviceID, IDSID);
 262     SOSPeerInfoV2DictionarySetValue(pi, sTransportType, transportType);
 263     SOSPeerInfoV2DictionarySetValue(pi, sPreferIDS, preferIDS);
 264
 265     SOSPeerInfoV2DictionarySetValue(pi, sViewsKey, enabledViews);
 266
 267     // ================ V2 Additions End
 268
 269     if (!SOSPeerInfoSign(signingKey, pi, error)) {
 270         CFReleaseNull(pi);
 271         goto exit;
 272     }
 273
 274 exit:
 275     CFReleaseNull(versionNumber);
 276     CFReleaseNull(publicBytes);
 277     return pi;
 278 }
 279
 280 SOSPeerInfoRef SOSPeerInfoCreate(CFAllocatorRef allocator, CFDictionaryRef gestalt, CFDataRef backup_key, SecKeyRef signingKey, CFErrorRef* error) {
 281     return SOSPeerInfoCreate_Internal(allocator, gestalt, backup_key, NULL, NULL, NULL, NULL, signingKey, error, ^(CFMutableDictionaryRef description) {});
 282 }
 283
 284 SOSPeerInfoRef SOSPeerInfoCreateWithTransportAndViews(CFAllocatorRef allocator, CFDictionaryRef gestalt, CFDataRef backup_key,
 285                                                       CFStringRef IDSID, CFStringRef transportType, CFBooleanRef preferIDS,
 286                                                       CFSetRef enabledViews,
 287                                                       SecKeyRef signingKey, CFErrorRef* error)
 288 {
 289     return SOSPeerInfoCreate_Internal(allocator, gestalt, backup_key, IDSID, transportType, preferIDS, enabledViews, signingKey, error, ^(CFMutableDictionaryRef description) {});
 290 }
 291
 292
 293 SOSPeerInfoRef SOSPeerInfoCreateCloudIdentity(CFAllocatorRef allocator, CFDictionaryRef gestalt, SecKeyRef signingKey, CFErrorRef* error) {
 294     return SOSPeerInfoCreate_Internal(allocator, gestalt, NULL, NULL, NULL, NULL, NULL, signingKey, error, ^(CFMutableDictionaryRef description) {
 295         CFDictionarySetValue(description, sCloudIdentityKey, kCFBooleanTrue);
 296     });
 297
 298 }
 299
 300
 301 SOSPeerInfoRef SOSPeerInfoCreateCopy(CFAllocatorRef allocator, SOSPeerInfoRef toCopy, CFErrorRef* error) {
 302     if(!toCopy) return NULL;
 303     SOSPeerInfoRef pi = CFTypeAllocate(SOSPeerInfo, struct __OpaqueSOSPeerInfo, allocator);
 304
 305     pi->description = CFDictionaryCreateMutableCopy(allocator, 0, toCopy->description);
 306     pi->signature = CFDataCreateCopy(allocator, toCopy->signature);
 307
 308     pi->gestalt = CFDictionaryCreateCopy(allocator, toCopy->gestalt);
 309     pi->id = CFStringCreateCopy(allocator, toCopy->id);
 310
 311     pi->version = toCopy->version;
 312     if(!SOSPeerInfoVersionHasV2Data(pi)) SOSPeerInfoExpandV2Data(pi, error);
 313
 314     return pi;
 315 }
 316
 317 bool SOSPeerInfoVersionIsCurrent(SOSPeerInfoRef pi) {
 318     return pi->version >= PEERINFO_CURRENT_VERSION;
 319 }
 320
 321 bool SOSPeerInfoVersionHasV2Data(SOSPeerInfoRef pi) {
 322     return pi->version >= kSOSPeerV2BaseVersion;
 323 }
 324
 325 SOSPeerInfoRef SOSPeerInfoCreateCurrentCopy(CFAllocatorRef allocator, SOSPeerInfoRef toCopy,
 326                                             CFStringRef IDSID, CFStringRef transportType, CFBooleanRef preferIDS, CFSetRef enabledViews,
 327                                             SecKeyRef signingKey, CFErrorRef* error) {
 328
 329     SOSPeerInfoRef pi = SOSPeerInfoCreateCopy(allocator, toCopy, error);
 330     if(!SOSPeerInfoVersionHasV2Data(pi)) SOSPeerInfoUpdateToV2(pi, error);
 331
 332     SOSPeerInfoSetSerialNumber(pi);
 333
 334     if (IDSID) {
 335         SOSPeerInfoV2DictionarySetValue(pi, sDeviceID, IDSID);
 336     }
 337     if (transportType) {
 338         SOSPeerInfoV2DictionarySetValue(pi, sTransportType, transportType);
 339     }
 340     if (preferIDS) {
 341         SOSPeerInfoV2DictionarySetValue(pi, sPreferIDS, preferIDS);
 342     }
 343     if (enabledViews) {
 344         SOSPeerInfoV2DictionarySetValue(pi, sViewsKey, enabledViews);
 345     }
 346
 347     if(!SOSPeerInfoSign(signingKey, pi, error)) {
 348         CFReleaseNull(pi);
 349     }
 350
 351     return pi;
 352 }
 353
 354
 355 static SOSPeerInfoRef SOSPeerInfoCopyWithModification(CFAllocatorRef allocator, SOSPeerInfoRef original,
 356                                                       SecKeyRef signingKey, CFErrorRef *error,
 357                                                       bool (^modification)(SOSPeerInfoRef peerToModify, CFErrorRef *error)) {
 358
 359     SOSPeerInfoRef result = NULL;
 360     SOSPeerInfoRef copy = SOSPeerInfoCreateCopy(allocator, original, error);
 361
 362     require_quiet(modification(copy, error), fail);
 363
 364     require_quiet(SOSPeerInfoSign(signingKey, copy, error), fail);
 365
 366     CFTransferRetained(result, copy);
 367
 368 fail:
 369     CFReleaseNull(copy);
 370     return result;
 371
 372 }
 373
 374 SOSPeerInfoRef SOSPeerInfoCopyWithGestaltUpdate(CFAllocatorRef allocator, SOSPeerInfoRef toCopy, CFDictionaryRef gestalt, SecKeyRef signingKey, CFErrorRef* error) {
 375     return SOSPeerInfoCopyWithModification(allocator, toCopy, signingKey, error,
 376                                            ^bool(SOSPeerInfoRef peerToModify, CFErrorRef *error) {
 377         CFRetainAssign(peerToModify->gestalt, gestalt);
 378         CFDictionarySetValue(peerToModify->description, sGestaltKey, peerToModify->gestalt);
 379         return true;
 380
 381     });
 382 }
 383
 384
 385 SOSPeerInfoRef SOSPeerInfoCopyWithBackupKeyUpdate(CFAllocatorRef allocator, SOSPeerInfoRef toCopy, CFDataRef backupKey, SecKeyRef signingKey, CFErrorRef *error) {
 386     return SOSPeerInfoCopyWithModification(allocator, toCopy, signingKey, error,
 387                                            ^bool(SOSPeerInfoRef peerToModify, CFErrorRef *error) {
 388         if (backupKey != NULL)
 389             SOSPeerInfoV2DictionarySetValue(peerToModify, sBackupKeyKey, backupKey);
 390         else
 391             SOSPeerInfoV2DictionaryRemoveValue(peerToModify, sBackupKeyKey);
 392         return true;
 393     });
 394 }
 395
 396 CFDataRef SOSPeerInfoCopyBackupKey(SOSPeerInfoRef peer) {
 397     return SOSPeerInfoV2DictionaryCopyData(peer, sBackupKeyKey);
 398 }
 399
 400 bool SOSPeerInfoHasBackupKey(SOSPeerInfoRef peer) {
 401     CFDataRef bk = SOSPeerInfoCopyBackupKey(peer);
 402     bool success = bk != NULL;
 403     CFReleaseNull(bk);
 404     return success;
 405 }
 406
 407 SOSPeerInfoRef SOSPeerInfoCopyWithViewsChange(CFAllocatorRef allocator, SOSPeerInfoRef toCopy,
 408                                               SOSViewActionCode action, CFStringRef viewname, SOSViewResultCode *retval,
 409                                               SecKeyRef signingKey, CFErrorRef* error) {
 410     SOSPeerInfoRef pi = SOSPeerInfoCreateCopy(allocator, toCopy, error);
 411     if(action == kSOSCCViewEnable) {
 412         *retval = SOSViewsEnable(pi, viewname, error);
 413         require((kSOSCCViewMember == *retval), exit);
 414     } else if(action == kSOSCCViewDisable) {
 415         *retval = SOSViewsDisable(pi, viewname, error);
 416         require((kSOSCCViewNotMember == *retval), exit);
 417     }
 418
 419     require_action_quiet(SOSPeerInfoSign(signingKey, pi, error), exit, *retval = kSOSCCGeneralViewError);
 420     return pi;
 421
 422 exit:
 423     CFReleaseNull(pi);
 424     return NULL;
 425 }
 426
 427
 428 CFStringRef sPingKey                   = CFSTR("Ping");
 429
 430 SOSPeerInfoRef SOSPeerInfoCopyWithPing(CFAllocatorRef allocator, SOSPeerInfoRef toCopy, SecKeyRef signingKey, CFErrorRef* error) {
 431     SOSPeerInfoRef pi = SOSPeerInfoCreateCopy(allocator, toCopy, error);
 432     CFDataRef ping = CFDataCreateWithRandomBytes(8);
 433     SOSPeerInfoV2DictionarySetValue(pi, sPingKey, ping);
 434     SecKeyRef pub_key = SOSPeerInfoCopyPubKey(pi);
 435     pi->id = SOSCopyIDOfKey(pub_key, error);
 436     require_quiet(pi->id, exit);
 437     require_action_quiet(SOSPeerInfoSign(signingKey, pi, error), exit, CFReleaseNull(pi));
 438
 439 exit:
 440     CFReleaseNull(pub_key);
 441     return pi;
 442 }
 443
 444
 445 SOSViewResultCode SOSPeerInfoViewStatus(SOSPeerInfoRef pi, CFStringRef view, CFErrorRef *error) {
 446     return SOSViewsQuery(pi, view, error);
 447 }
 448
 449
 450 SOSPeerInfoRef SOSPeerInfoCopyWithSecurityPropertyChange(CFAllocatorRef allocator, SOSPeerInfoRef toCopy,
 451                                                          SOSSecurityPropertyActionCode action, CFStringRef property, SOSSecurityPropertyResultCode *retval,
 452                                                          SecKeyRef signingKey, CFErrorRef* error) {
 453     SOSPeerInfoRef pi = SOSPeerInfoCreateCopy(allocator, toCopy, error);
 454     if(action == kSOSCCSecurityPropertyEnable) {
 455         *retval = SOSSecurityPropertyEnable(pi, property, error);
 456         require((kSOSCCSecurityPropertyValid == *retval), exit);
 457     } else if(action == kSOSCCSecurityPropertyDisable) {
 458         *retval = SOSSecurityPropertyDisable(pi, property, error);
 459         require((kSOSCCSecurityPropertyNotValid == *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 SOSViewResultCode SOSPeerInfoSecurityPropertyStatus(SOSPeerInfoRef pi, CFStringRef property, CFErrorRef *error) {
 471         return SOSSecurityPropertyQuery(pi, property, error);
 472     }
 473
 474
 475
 476 static void SOSPeerInfoDestroy(CFTypeRef aObj) {
 477     SOSPeerInfoRef pi = (SOSPeerInfoRef) aObj;
 478
 479     if(!pi) return;
 480     CFReleaseNull(pi->description);
 481     CFReleaseNull(pi->signature);
 482     CFReleaseNull(pi->gestalt);
 483     CFReleaseNull(pi->id);
 484     CFReleaseNull(pi->v2Dictionary);
 485     CFReleaseNull(pi->secproperties);
 486 }
 487
 488 static Boolean SOSPeerInfoCompare(CFTypeRef lhs, CFTypeRef rhs) {
 489     SOSPeerInfoRef lpeer = (SOSPeerInfoRef) lhs;
 490     SOSPeerInfoRef rpeer = (SOSPeerInfoRef) rhs;
 491     if(!lpeer || !rpeer) return false;
 492     return CFEqualSafe(lpeer->description, rpeer->description) && CFEqualSafe(lpeer->signature, rpeer->signature);
 493 }
 494
 495
 496 CFComparisonResult SOSPeerInfoCompareByID(const void *val1, const void *val2, void *context) {
 497     // The code below is necessary but not sufficient; not returning a CFComparisonResult
 498     // It probably is OK to say that a NULL is <  <non-NULL>
 499     if (val1 == NULL || val2 == NULL) {
 500             ptrdiff_t dv = val1 - val2;
 501                 return dv < 0 ? kCFCompareLessThan : dv == 0 ? kCFCompareEqualTo : kCFCompareGreaterThan;
 502     }
 503
 504         CFStringRef v1 = SOSPeerInfoGetPeerID((SOSPeerInfoRef) val1);
 505         CFStringRef v2 = SOSPeerInfoGetPeerID((SOSPeerInfoRef) val2);
 506     if (v1 == NULL || v2 == NULL) {
 507             ptrdiff_t dv = (const void *)v1 - (const void *)v2;
 508         return dv < 0 ? kCFCompareLessThan : dv == 0 ? kCFCompareEqualTo : kCFCompareGreaterThan;
 509     }
 510
 511     return CFStringCompare(v1, v2, 0);
 512 }
 513
 514 static CFHashCode SOSPeerInfoHash(CFTypeRef cf) {
 515     SOSPeerInfoRef peer = (SOSPeerInfoRef) cf;
 516
 517     return CFHash(peer->description) ^ CFHash(peer->signature);
 518 }
 519
 520 static CFStringRef copyDescriptionWithFormatOptions(CFTypeRef aObj, CFDictionaryRef formatOptions){
 521
 522     SOSPeerInfoRef pi = (SOSPeerInfoRef) aObj;
 523     CFStringRef description = NULL;
 524
 525
 526     // Get the format options we care about:
 527     CFNumberRef peerIDLengthNumber = formatOptions ? CFDictionaryGetValue(formatOptions, peerIDLengthKey) : NULL;
 528     bool useSyncDFormat = formatOptions && CFDictionaryContainsKey(formatOptions, CFSTR("SyncD"));
 529
 530     // Calculate the truncated length
 531     CFIndex truncatedLength = CFStringGetLength(pi->id);
 532     if (isNumber(peerIDLengthNumber)) {
 533         CFIndex peerIDMaximumLength = truncatedLength;
 534         CFNumberGetValue(peerIDLengthNumber, kCFNumberCFIndexType, &peerIDMaximumLength);
 535         truncatedLength = MIN(truncatedLength, peerIDMaximumLength);
 536     }
 537     CFStringRef displayPeerID = CFStringCreateWithSubstring(kCFAllocatorDefault, pi->id, CFRangeMake(0, truncatedLength));
 538
 539     CFStringRef objectPrefix = useSyncDFormat ? CFSTR("PI") :
 540                                                 CFStringCreateWithFormat(kCFAllocatorDefault, formatOptions, CFSTR("PeerInfo@%p"), pi);
 541
 542     CFStringRef osVersion = CFDictionaryGetValue(pi->gestalt, kPIOSVersionKey);
 543
 544     CFStringRef transportType = SOSPeerInfoV2DictionaryCopyString(pi, sTransportType);
 545     CFStringRef deviceID = SOSPeerInfoV2DictionaryCopyString(pi, sDeviceID);
 546
 547     description = CFStringCreateWithFormat(NULL, NULL, CFSTR("<%@: %s%s '%@' %@ %@ %@ %@ %@ %ld>"),
 548                                            objectPrefix,
 549                                            SOSPeerInfoIsRetirementTicket(pi) ? "R" : "-",
 550                                            SOSPeerInfoHasBackupKey(pi) ? "B" : "-",
 551                                            CFDictionaryGetValue(pi->gestalt, kPIUserDefinedDeviceNameKey),
 552                                            CFDictionaryGetValue(pi->gestalt, kPIDeviceModelNameKey),
 553                                            osVersion ? osVersion : CFSTR("????"),
 554                                            transportType ? transportType : CFSTR("KVS"),
 555                                            deviceID ? deviceID : CFSTR(""),
 556                                            displayPeerID,
 557                                            pi->version);
 558
 559     CFReleaseNull(transportType);
 560     CFReleaseNull(deviceID);
 561
 562     CFReleaseNull(objectPrefix);
 563     CFReleaseNull(displayPeerID);
 564
 565     return description;
 566 }
 567
 568 static CFStringRef SOSPeerInfoCopyFormatDescription(CFTypeRef aObj, CFDictionaryRef formatOptions) {
 569
 570     CFStringRef description = NULL;
 571
 572     description = copyDescriptionWithFormatOptions(aObj, formatOptions);
 573
 574     return description;
 575 }
 576
 577 CFDictionaryRef SOSPeerInfoCopyPeerGestalt(SOSPeerInfoRef pi) {
 578     CFRetain(pi->gestalt);
 579     return pi->gestalt;
 580 }
 581
 582 CFDictionaryRef SOSPeerGetGestalt(SOSPeerInfoRef pi){
 583     return pi->gestalt;
 584 }
 585
 586 CFStringRef SOSPeerInfoGetPeerName(SOSPeerInfoRef peer) {
 587     return SOSPeerInfoLookupGestaltValue(peer, kPIUserDefinedDeviceNameKey);
 588 }
 589
 590 CFStringRef SOSPeerInfoGetPeerDeviceType(SOSPeerInfoRef peer) {
 591     return SOSPeerInfoLookupGestaltValue(peer, kPIDeviceModelNameKey);
 592 }
 593
 594 CFIndex SOSPeerInfoGetPeerProtocolVersion(SOSPeerInfoRef peer) {
 595     CFIndex version = PEERINFO_CURRENT_VERSION;
 596     CFTypeRef val = SOSPeerInfoLookupGestaltValue(peer, kPIMessageProtocolVersionKey);
 597     if (val && CFGetTypeID(val) == CFNumberGetTypeID())
 598         CFNumberGetValue(val, kCFNumberCFIndexType, &version);
 599     return version;
 600 }
 601
 602 CFTypeRef SOSPeerInfoLookupGestaltValue(SOSPeerInfoRef pi, CFStringRef key) {
 603     return CFDictionaryGetValue(pi->gestalt, key);
 604 }
 605
 606 CFStringRef SOSPeerInfoGetPeerID(SOSPeerInfoRef pi) {
 607     return pi ? pi->id : NULL;
 608 }
 609
 610 bool SOSPeerInfoPeerIDEqual(SOSPeerInfoRef pi, CFStringRef myPeerID) {
 611     return CFEqualSafe(myPeerID, SOSPeerInfoGetPeerID(pi));
 612 }
 613
 614 CFIndex SOSPeerInfoGetVersion(SOSPeerInfoRef pi) {
 615     return pi->version;
 616 }
 617
 618 bool SOSPeerInfoUpdateDigestWithPublicKeyBytes(SOSPeerInfoRef peer, const struct ccdigest_info *di,
 619                                                ccdigest_ctx_t ctx, CFErrorRef *error) {
 620     CFDataRef pubKeyBytes = CFDictionaryGetValue(peer->description, sPublicKeyKey);
 621
 622     if(!pubKeyBytes) {
 623         SOSCreateErrorWithFormat(kSOSErrorEncodeFailure, NULL, error, NULL, CFSTR("Digest failed – no public key"));
 624         return false;
 625     }
 626
 627     ccdigest_update(di, ctx, CFDataGetLength(pubKeyBytes), CFDataGetBytePtr(pubKeyBytes));
 628
 629     return true;
 630 }
 631
 632 bool SOSPeerInfoUpdateDigestWithDescription(SOSPeerInfoRef peer, const struct ccdigest_info *di,
 633                                             ccdigest_ctx_t ctx, CFErrorRef *error) {
 634     if(SOSPeerInfoVersionHasV2Data(peer)) SOSPeerInfoPackV2Data(peer);
 635     size_t description_size = der_sizeof_plist(peer->description, error);
 636     uint8_t data_begin[description_size];
 637     uint8_t *data_end = data_begin + description_size;
 638     uint8_t *encoded = der_encode_plist(peer->description, error, data_begin, data_end);
 639
 640     if(!encoded) {
 641         SOSCreateErrorWithFormat(kSOSErrorEncodeFailure, NULL, error, NULL, CFSTR("Description encode failed"));
 642         return false;
 643     }
 644
 645     ccdigest_update(di, ctx, description_size, data_begin);
 646
 647     return true;
 648 }
 649
 650
 651 static CFDataRef sosCreateDate() {
 652     CFDateRef now = CFDateCreate(NULL, CFAbsoluteTimeGetCurrent());
 653     size_t bufsiz = der_sizeof_date(now, NULL);
 654     uint8_t buf[bufsiz];
 655     der_encode_date(now, NULL, buf, buf+bufsiz);
 656     CFReleaseNull(now);
 657     return CFDataCreate(NULL, buf, bufsiz);
 658 }
 659
 660 static CFDateRef sosCreateCFDate(CFDataRef sosdate) {
 661     CFDateRef date;
 662     der_decode_date(NULL, 0, &date, NULL, CFDataGetBytePtr(sosdate),
 663                     CFDataGetBytePtr(sosdate) + CFDataGetLength(sosdate));
 664     return date;
 665 }
 666
 667 static bool sospeer_application_hash(SOSPeerInfoRef pi, const struct ccdigest_info *di, uint8_t *hbuf) {
 668     CFDataRef appdate = CFDictionaryGetValue(pi->description, sApplicationDate);
 669     if(!appdate) return false;
 670     ccdigest_di_decl(di, ctx);
 671     ccdigest_init(di, ctx);
 672     ccdigest_update(di, ctx, CFDataGetLength(appdate), CFDataGetBytePtr(appdate));
 673     if (!SOSPeerInfoUpdateDigestWithPublicKeyBytes(pi, di, ctx, NULL)) return false;
 674     ccdigest_final(di, ctx, hbuf);
 675     return true;
 676 }
 677
 678 SOSPeerInfoRef SOSPeerInfoCopyAsApplication(SOSPeerInfoRef original, SecKeyRef userkey, SecKeyRef peerkey, CFErrorRef *error) {
 679     SOSPeerInfoRef result = NULL;
 680     SOSPeerInfoRef pi = SOSPeerInfoCreateCopy(kCFAllocatorDefault, original, error);
 681     const struct ccdigest_info *di = ccsha256_di();
 682     uint8_t hbuf[di->output_size];
 683     CFDataRef usersig = NULL;
 684
 685     CFDataRef creationDate = sosCreateDate();
 686     CFDictionarySetValue(pi->description, sApplicationDate, creationDate);
 687     CFReleaseNull(creationDate);
 688
 689     // Create User Application Signature
 690     require_action_quiet(sospeer_application_hash(pi, di, hbuf), fail,
 691                          SOSCreateError(kSOSErrorUnexpectedType, CFSTR("Failed to create hash for peer applicant"), NULL, error));
 692
 693     usersig = sosSignHash(userkey, di, hbuf);
 694     require_action_quiet(usersig, fail,
 695                         SOSCreateError(kSOSErrorUnexpectedType, CFSTR("Failed to sign public key hash for peer"), NULL, error));
 696
 697     CFDictionarySetValue(pi->description, sApplicationUsig, usersig);
 698
 699     require_quiet(SOSPeerInfoSign(peerkey, pi, error), fail);
 700
 701     result = pi;
 702     pi = NULL;
 703
 704 fail:
 705     CFReleaseNull(usersig);
 706     CFReleaseNull(pi);
 707     return result;
 708 }
 709
 710 bool SOSPeerInfoApplicationVerify(SOSPeerInfoRef pi, SecKeyRef userkey, CFErrorRef *error) {
 711     const struct ccdigest_info *di = ccsha256_di();
 712     uint8_t hbuf[di->output_size];
 713     bool result = false;
 714
 715     CFDataRef usig = CFDictionaryGetValue(pi->description, sApplicationUsig);
 716     require_action_quiet(usig, exit,
 717                          SOSCreateError(kSOSErrorUnexpectedType, CFSTR("Peer is not an applicant"), NULL, error));
 718     // Verify User Application Signature
 719     require_action_quiet(sospeer_application_hash(pi, di, hbuf), exit,
 720                          SOSCreateError(kSOSErrorUnexpectedType, CFSTR("Failed to create hash for peer applicant"), NULL, error));
 721     require_action_quiet(sosVerifyHash(userkey, di, hbuf, usig), exit,
 722                          SOSCreateError(kSOSErrorUnexpectedType, CFSTR("user signature of public key hash fails to verify"), NULL, error));
 723
 724     result = SOSPeerInfoVerify(pi, error);
 725
 726 exit:
 727     return result;
 728 }
 729
 730
 731 static CF_RETURNS_RETAINED CFDateRef sosPeerInfoGetDate(SOSPeerInfoRef pi, CFStringRef entry) {
 732     if(!pi) return NULL;
 733     CFDataRef sosdate = CFDictionaryGetValue(pi->description, entry);
 734     if(!sosdate) return NULL;
 735     CFDateRef date = sosCreateCFDate(sosdate);
 736
 737     return date;
 738 }
 739
 740 CF_RETURNS_RETAINED CFDateRef SOSPeerInfoGetApplicationDate(SOSPeerInfoRef pi) {
 741     return sosPeerInfoGetDate(pi, sApplicationDate);
 742 }
 743
 744 CF_RETURNS_RETAINED CFDateRef SOSPeerInfoGetRetirementDate(SOSPeerInfoRef pi) {
 745     return sosPeerInfoGetDate(pi, sRetirementDate);
 746 }
 747
 748
 749
 750 //
 751 // Gestalt helpers
 752 //
 753
 754 CFStringRef SOSPeerGestaltGetName(CFDictionaryRef gestalt) {
 755     CFStringRef name = SOSPeerGestaltGetAnswer(gestalt, kPIUserDefinedDeviceNameKey);
 756     return isString(name) ? name : NULL;
 757 }
 758
 759 CFTypeRef SOSPeerGestaltGetAnswer(CFDictionaryRef gestalt, CFStringRef question) {
 760     return gestalt ? CFDictionaryGetValue(gestalt, question) : NULL;
 761 }
 762
 763 //
 764 // Peer Retirement
 765 //
 766
 767
 768 SOSPeerInfoRef SOSPeerInfoCreateRetirementTicket(CFAllocatorRef allocator, SecKeyRef privKey, SOSPeerInfoRef peer, CFErrorRef *error) {
 769     // Copy PeerInfo
 770     SOSPeerInfoRef pi = SOSPeerInfoCreateCopy(allocator, peer, error);
 771
 772     require(pi, fail);
 773
 774     // Fill out Resignation Date
 775     CFDataRef resignationDate = sosCreateDate();
 776     CFDictionaryAddValue(pi->description, sRetirementDate, resignationDate);
 777     CFReleaseNull(resignationDate);
 778
 779     require(SOSPeerInfoSign(privKey, pi, error), fail);
 780
 781     return pi;
 782
 783 fail:
 784     CFReleaseNull(pi);
 785     return NULL;
 786 }
 787
 788 CFStringRef SOSPeerInfoInspectRetirementTicket(SOSPeerInfoRef pi, CFErrorRef *error) {
 789     CFStringRef retval = NULL;
 790     CFDateRef now = CFDateCreate(NULL, CFAbsoluteTimeGetCurrent());
 791     CFDateRef retirement = NULL;
 792
 793     require_quiet(SOSPeerInfoVerify(pi, error), err);
 794
 795     retirement = sosCreateCFDate(CFDictionaryGetValue(pi->description, sRetirementDate));
 796
 797     require_action_quiet(retirement, err,
 798                          SOSCreateError(kSOSErrorUnexpectedType, CFSTR("Peer is not retired"), NULL, error));
 799
 800     require_action_quiet(CFDateCompare(now, retirement, NULL) == kCFCompareGreaterThan, err,
 801                          SOSCreateError(kSOSErrorUnexpectedType, CFSTR("Retirement date is after current date"), NULL, error));
 802
 803     retval = SOSPeerInfoGetPeerID(pi);
 804
 805 err:
 806     CFReleaseNull(now);
 807     CFReleaseNull(retirement);
 808     return retval;
 809 }
 810
 811 bool SOSPeerInfoRetireRetirementTicket(size_t max_seconds, SOSPeerInfoRef pi) {
 812     CFDateRef now = CFDateCreate(NULL, CFAbsoluteTimeGetCurrent());
 813     CFDateRef retirement = sosCreateCFDate(CFDictionaryGetValue(pi->description, sRetirementDate));
 814     CFTimeInterval timediff = CFDateGetTimeIntervalSinceDate(now, retirement); // diff in seconds
 815     CFReleaseNull(now);
 816     CFReleaseNull(retirement);
 817     if(timediff > (max_seconds)) return true;
 818     return false;
 819 }
 820
 821 bool SOSPeerInfoIsRetirementTicket(SOSPeerInfoRef pi) {
 822     CFDataRef flag = CFDictionaryGetValue(pi->description, sRetirementDate);
 823     return flag != NULL;
 824 }
 825
 826 bool SOSPeerInfoIsCloudIdentity(SOSPeerInfoRef pi) {
 827     CFTypeRef value = CFDictionaryGetValue(pi->description, sCloudIdentityKey);
 828     return CFEqualSafe(value, kCFBooleanTrue);
 829 }
 830
 831 SOSPeerInfoRef SOSPeerInfoUpgradeSignatures(CFAllocatorRef allocator, SecKeyRef privKey, SecKeyRef peerKey, SOSPeerInfoRef peer, CFErrorRef *error) {
 832     SecKeyRef pubKey = SecKeyCreatePublicFromPrivate(privKey);
 833     SOSPeerInfoRef retval = NULL;
 834
 835     retval = SOSPeerInfoCopyAsApplication(peer, privKey, peerKey, error);
 836     CFReleaseNull(pubKey);
 837     return retval;
 838 }
 839
 840 CFBooleanRef SOSPeerInfoCopyIDSPreference(SOSPeerInfoRef peer){
 841     CFBooleanRef preference = (CFBooleanRef)SOSPeerInfoV2DictionaryCopyBoolean(peer, sPreferIDS);
 842     return (preference ? preference : CFRetain(kCFBooleanFalse));
 843 }
 844
 845
 846 SOSPeerInfoRef SOSPeerInfoSetIDSPreference(CFAllocatorRef allocator, SOSPeerInfoRef toCopy, CFBooleanRef preference, SecKeyRef signingKey, CFErrorRef *error){
 847             return SOSPeerInfoCopyWithModification(allocator, toCopy, signingKey, error,
 848                                                ^bool(SOSPeerInfoRef peerToModify, CFErrorRef *error) {
 849                                                    SOSPeerInfoV2DictionarySetValue(peerToModify, sPreferIDS, preference);
 850                                                    return true;
 851                                                });
 852 }
 853
 854 CFStringRef SOSPeerInfoCopyTransportType(SOSPeerInfoRef peer){
 855     CFStringRef transportType = (CFStringRef)SOSPeerInfoV2DictionaryCopyString(peer, sTransportType);
 856     return (transportType ? transportType : CFRetain(SOSTransportMessageTypeKVS));
 857 }
 858
 859 SOSPeerInfoRef SOSPeerInfoSetTransportType(CFAllocatorRef allocator, SOSPeerInfoRef toCopy, CFStringRef transportType, SecKeyRef signingKey, CFErrorRef *error){
 860
 861     return SOSPeerInfoCopyWithModification(allocator, toCopy, signingKey, error,
 862                                            ^bool(SOSPeerInfoRef peerToModify, CFErrorRef *error) {
 863                                                SOSPeerInfoV2DictionarySetValue(peerToModify, sTransportType, transportType);
 864                                                return true;
 865                                            });
 866 }
 867
 868 bool SOSPeerInfoHasDeviceID(SOSPeerInfoRef peer) {
 869     return SOSPeerInfoV2DictionaryHasString(peer, sDeviceID);
 870 }
 871
 872 CFStringRef SOSPeerInfoCopyDeviceID(SOSPeerInfoRef peer){
 873     return (CFStringRef)SOSPeerInfoV2DictionaryCopyString(peer, sDeviceID);
 874 }
 875
 876 SOSPeerInfoRef SOSPeerInfoSetDeviceID(CFAllocatorRef allocator, SOSPeerInfoRef toCopy, CFStringRef IDS, SecKeyRef signingKey, CFErrorRef *error){
 877
 878     return SOSPeerInfoCopyWithModification(allocator, toCopy, signingKey, error,
 879                                            ^bool(SOSPeerInfoRef peerToModify, CFErrorRef *error) {
 880                                                SOSPeerInfoV2DictionarySetValue(peerToModify, sDeviceID, IDS);
 881                                                return true;
 882                                            });
 883 }
 884
 885 bool SOSPeerInfoShouldUseIDSTransport(SOSPeerInfoRef myPeer, SOSPeerInfoRef theirPeer){
 886
 887     CFBooleanRef myPreference = SOSPeerInfoCopyIDSPreference(myPeer);
 888     CFStringRef myTransportType = SOSPeerInfoCopyTransportType(myPeer);
 889
 890     CFBooleanRef theirPreference = SOSPeerInfoCopyIDSPreference(theirPeer);
 891     CFStringRef theirTransportType = SOSPeerInfoCopyTransportType(theirPeer);
 892
 893     bool success = false;
 894     //If I'm a galarch KVS + peer is KVS and ids only is true for both == KVS
 895     if((CFStringCompare(myTransportType, SOSTransportMessageTypeKVS, 0) == 0 && CFStringCompare(theirTransportType, SOSTransportMessageTypeKVS, 0) == 0)&& (myPreference == kCFBooleanTrue && theirPreference == kCFBooleanTrue))
 896         success = false;
 897
 898     //If transport is IDS Galarch +1 (Pref is true) and peer is KVS (ids is true) == IDS
 899     else if ((CFStringCompare(myTransportType, SOSTransportMessageTypeIDS, 0) == 0 && CFStringCompare(theirTransportType, SOSTransportMessageTypeKVS, 0) == 0) && (myPreference == kCFBooleanTrue && theirPreference == kCFBooleanTrue))
 900         success = true;
 901
 902     else if ((CFStringCompare(theirTransportType, SOSTransportMessageTypeIDS, 0) == 0 && CFStringCompare(myTransportType, SOSTransportMessageTypeKVS, 0) == 0) && (theirPreference == kCFBooleanTrue && myPreference == kCFBooleanTrue))
 903         success = true;
 904
 905     //If transport is IDS Galarch +1 and peer is IDS Galarch +1 (prefer IDS is true) == IDS
 906     else if ((CFStringCompare(myTransportType, SOSTransportMessageTypeIDS, 0) == 0 && CFStringCompare(theirTransportType, SOSTransportMessageTypeIDS, 0) == 0))
 907         success = true;
 908
 909     //If KVS and KVS prefer IDS is false (set to false or doesn't exist) == KVS
 910     else if ((CFStringCompare(myTransportType, SOSTransportMessageTypeKVS, 0) == 0 && CFStringCompare(theirTransportType, SOSTransportMessageTypeKVS, 0) == 0) && (myPreference == kCFBooleanFalse && theirPreference == kCFBooleanFalse))
 911         success = false;
 912
 913     else
 914         success = false;
 915
 916     CFReleaseSafe(myPreference);
 917     CFReleaseSafe(myTransportType);
 918     CFReleaseSafe(theirPreference);
 919     CFReleaseSafe(theirTransportType);
 920     return success;
 921 }