keychain/ot/OTPrepareOperation.m

   1 /*
   2  * Copyright (c) 2018 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 #if OCTAGON
  25
  26 #import "utilities/debugging.h"
  27 #import <Security/SecKey.h>
  28 #import <Security/SecKeyPriv.h>
  29
  30 #import "keychain/ot/OTCuttlefishContext.h"
  31 #import "keychain/ot/OTFetchViewsOperation.h"
  32 #import "keychain/ot/OTOperationDependencies.h"
  33 #import "keychain/ot/OTPrepareOperation.h"
  34
  35 #import "keychain/TrustedPeersHelper/TrustedPeersHelperProtocol.h"
  36 #import "keychain/ot/ObjCImprovements.h"
  37
  38 @interface OTPrepareOperation ()
  39 @property OTOperationDependencies* deps;
  40 @property NSOperation* finishedOp;
  41 @end
  42
  43 @implementation OTPrepareOperation
  44 @synthesize intendedState = _intendedState;
  45 @synthesize nextState = _nextState;
  46
  47 - (instancetype)initWithDependencies:(OTOperationDependencies*)dependencies
  48                        intendedState:(OctagonState*)intendedState
  49                           errorState:(OctagonState*)errorState
  50                           deviceInfo:(OTDeviceInformation*)deviceInfo
  51                                epoch:(uint64_t)epoch
  52 {
  53     if((self = [super init])) {
  54         _deps = dependencies;
  55
  56         _deviceInfo = deviceInfo;
  57         _epoch = epoch;
  58
  59         _intendedState = intendedState;
  60         _nextState = errorState;
  61     }
  62     return self;
  63 }
  64
  65 - (void)groupStart
  66 {
  67     secnotice("octagon", "preparing an identity");
  68
  69     self.finishedOp = [[NSOperation alloc] init];
  70     [self dependOnBeforeGroupFinished:self.finishedOp];
  71
  72     NSString* bottleSalt = nil;
  73
  74     NSError *authKitError = nil;
  75     NSString *altDSID = [self.deps.authKitAdapter primaryiCloudAccountAltDSID:&authKitError];
  76
  77     if (altDSID) {
  78         bottleSalt = altDSID;
  79     }
  80     else {
  81         secnotice("octagon-sos", "AuthKit doesn't know about the altDSID: %@", authKitError);
  82
  83         NSError* accountError = nil;
  84         OTAccountMetadataClassC* account = [self.deps.stateHolder loadOrCreateAccountMetadata:&accountError];
  85
  86         if(account && !accountError) {
  87             secnotice("octagon", "retrieved account, altdsid is: %@", account.altDSID);
  88             bottleSalt = account.altDSID;
  89         }
  90         if(accountError || !account){
  91             secerror("failed to rerieve account object: %@", accountError);
  92         }
  93     }
  94     WEAKIFY(self);
  95
  96     // But, if this device is SOS-enabled and SOS is present, use the SOS octagon keys (if present)
  97     NSData* signingKeyPersistRef = nil;
  98     NSData* encryptionKeyPersistRef = nil;
  99     if(self.deps.sosAdapter.sosEnabled) {
 100         secnotice("octagon-sos", "Investigating use of Octagon keys from SOS identity");
 101
 102         NSError* error = nil;
 103         id<CKKSSelfPeer> sosSelf = [self.deps.sosAdapter currentSOSSelf:&error];
 104
 105         if(!sosSelf || error) {
 106             secnotice("octagon-sos", "Failed to get the current SOS self: %@", error);
 107         } else {
 108             // Fetch the persistent references for our signing and encryption keys
 109             OSStatus status = errSecSuccess;
 110             CFDataRef cfSigningKeyPersistRef = NULL;
 111             status = SecKeyCopyPersistentRef(sosSelf.signingKey.secKey, &cfSigningKeyPersistRef);
 112             if(status != errSecSuccess || !cfSigningKeyPersistRef) {
 113                 secnotice("octagon-sos", "Failed to get the persistent ref for our SOS signing key: %d", (int)status);
 114             } else {
 115                 CFDataRef cfEncryptionKeyPersistRef = NULL;
 116                 status = SecKeyCopyPersistentRef(sosSelf.encryptionKey.secKey, &cfEncryptionKeyPersistRef);
 117                 if(status != errSecSuccess || !cfEncryptionKeyPersistRef) {
 118                     secnotice("octagon-sos", "Failed to get the persistent ref for our SOS encryption key: %d", (int)status);
 119                     CFReleaseNull(cfSigningKeyPersistRef);
 120                     CFReleaseNull(cfEncryptionKeyPersistRef);
 121                 } else {
 122                     // We only want to use these keys if we successfully have both
 123                     signingKeyPersistRef = CFBridgingRelease(cfSigningKeyPersistRef);
 124                     encryptionKeyPersistRef = CFBridgingRelease(cfEncryptionKeyPersistRef);
 125                 }
 126             }
 127         }
 128     }
 129
 130     NSError* persistError = nil;
 131     BOOL persisted = [self.deps.stateHolder persistOctagonJoinAttempt:OTAccountMetadataClassC_AttemptedAJoinState_ATTEMPTED error:&persistError];
 132     if(!persisted || persistError) {
 133         secerror("octagon: failed to save 'attempted join' state: %@", persistError);
 134     }
 135
 136     [self.deps.cuttlefishXPCWrapper prepareWithContainer:self.deps.containerName
 137                                                  context:self.deps.contextID
 138                                                    epoch:self.epoch
 139                                                machineID:self.deviceInfo.machineID
 140                                               bottleSalt:bottleSalt
 141                                                 bottleID:[NSUUID UUID].UUIDString
 142                                                  modelID:self.deviceInfo.modelID
 143                                               deviceName:self.deviceInfo.deviceName
 144                                             serialNumber:self.deviceInfo.serialNumber
 145                                                osVersion:self.deviceInfo.osVersion
 146                                            policyVersion:nil
 147                                            policySecrets:nil
 148                              signingPrivKeyPersistentRef:signingKeyPersistRef
 149                                  encPrivKeyPersistentRef:encryptionKeyPersistRef
 150                                                    reply:^(NSString * _Nullable peerID, NSData * _Nullable permanentInfo, NSData * _Nullable permanentInfoSig, NSData * _Nullable stableInfo, NSData * _Nullable stableInfoSig, NSError * _Nullable error) {
 151             STRONGIFY(self);
 152             [[CKKSAnalytics logger] logResultForEvent:OctagonEventPrepareIdentity hardFailure:true result:error];
 153             if(error) {
 154                 secerror("octagon: Error preparing identity: %@", error);
 155                 self.error = error;
 156                 [self runBeforeGroupFinished:self.finishedOp];
 157             } else {
 158                 secnotice("octagon", "Prepared: %@ %@ %@", peerID, permanentInfo, permanentInfoSig);
 159                 self.peerID = peerID;
 160                 self.permanentInfo = permanentInfo;
 161                 self.permanentInfoSig = permanentInfoSig;
 162                 self.stableInfo = stableInfo;
 163                 self.stableInfoSig = stableInfoSig;
 164
 165                 NSError* localError = nil;
 166                 BOOL persisted = [self.deps.stateHolder persistNewEgoPeerID:peerID error:&localError];
 167                 if(!persisted || localError) {
 168                     secnotice("octagon", "Couldn't persist peer ID: %@", localError);
 169                     self.error = localError;
 170                     [self runBeforeGroupFinished:self.finishedOp];
 171                 } else {
 172                     WEAKIFY(self);
 173
 174                     CKKSResultOperation *doneOp = [CKKSResultOperation named:@"ot-prepare"
 175                                                                    withBlock:^{
 176                             STRONGIFY(self);
 177                             self.nextState = self.intendedState;
 178                         }];
 179
 180                     OTFetchViewsOperation *fetchViewsOp = [[OTFetchViewsOperation alloc] initWithDependencies:self.deps];
 181                     [self runBeforeGroupFinished:fetchViewsOp];
 182                     [doneOp addDependency:fetchViewsOp];
 183                     [self runBeforeGroupFinished:doneOp];
 184                     [self.finishedOp addDependency:doneOp];
 185                     [self runBeforeGroupFinished:self.finishedOp];
 186                 }
 187             }
 188         }];
 189 }
 190
 191 @end
 192
 193 #endif // OCTAGON