keychain/ot/OTVouchWithBottleOperation.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
  28 #import "keychain/ot/OTVouchWithBottleOperation.h"
  29 #import "keychain/ot/OTClientStateMachine.h"
  30 #import "keychain/ot/OTCuttlefishContext.h"
  31 #import "keychain/ot/OTFetchCKKSKeysOperation.h"
  32
  33 #import "keychain/TrustedPeersHelper/TrustedPeersHelperProtocol.h"
  34 #import "keychain/ot/ObjCImprovements.h"
  35
  36 @interface OTVouchWithBottleOperation ()
  37 @property OTOperationDependencies* deps;
  38
  39 @property NSOperation* finishedOp;
  40 @end
  41
  42 @implementation OTVouchWithBottleOperation
  43 @synthesize intendedState = _intendedState;
  44
  45 - (instancetype)initWithDependencies:(OTOperationDependencies*)dependencies
  46                        intendedState:(OctagonState*)intendedState
  47                           errorState:(OctagonState*)errorState
  48                             bottleID:(NSString*)bottleID
  49                              entropy:(NSData*)entropy
  50                           bottleSalt:(NSString*)bottleSalt
  51 {
  52     if((self = [super init])) {
  53         _deps = dependencies;
  54         _intendedState = intendedState;
  55         _nextState = errorState;
  56
  57         _bottleID = bottleID;
  58         _entropy = entropy;
  59         _bottleSalt = bottleSalt;
  60     }
  61     return self;
  62 }
  63
  64 - (void)groupStart
  65 {
  66     secnotice("octagon", "creating voucher using a bottle with escrow record id: %@", self.bottleID);
  67
  68     self.finishedOp = [[NSOperation alloc] init];
  69     [self dependOnBeforeGroupFinished:self.finishedOp];
  70
  71     if(self.bottleSalt != nil) {
  72         secnotice("octagon", "using passed in altdsid, altdsid is: %@", self.bottleSalt);
  73     } else{
  74         NSString* altDSID = self.deps.authKitAdapter.primaryiCloudAccountAltDSID;
  75         if(altDSID){
  76             secnotice("octagon", "fetched altdsid is: %@", altDSID);
  77             self.bottleSalt = altDSID;
  78         }
  79         else {
  80             NSError* accountError = nil;
  81             OTAccountMetadataClassC* account = [self.deps.stateHolder loadOrCreateAccountMetadata:&accountError];
  82
  83             if(account && !accountError) {
  84                 secnotice("octagon", "retrieved account, altdsid is: %@", account.altDSID);
  85                 self.bottleSalt = account.altDSID;
  86             }
  87             if(accountError || !account){
  88                 secerror("failed to rerieve account object: %@", accountError);
  89             }
  90         }
  91     }
  92
  93     WEAKIFY(self);
  94
  95     // After a vouch, we also want to acquire all TLKs that the bottled peer might have had
  96     OTFetchCKKSKeysOperation* fetchKeysOp = [[OTFetchCKKSKeysOperation alloc] initWithDependencies:self.deps];
  97     [self runBeforeGroupFinished:fetchKeysOp];
  98
  99     CKKSResultOperation* proceedWithKeys = [CKKSResultOperation named:@"bottle-tlks"
 100                                                             withBlock:^{
 101                                                                 STRONGIFY(self);
 102                                                                 [self proceedWithKeys:fetchKeysOp.viewKeySets tlkShares:fetchKeysOp.tlkShares];
 103                                                             }];
 104
 105     [proceedWithKeys addDependency:fetchKeysOp];
 106     [self runBeforeGroupFinished:proceedWithKeys];
 107 }
 108
 109 - (void)proceedWithKeys:(NSArray<CKKSKeychainBackedKeySet*>*)viewKeySets tlkShares:(NSArray<CKKSTLKShare*>*)tlkShares
 110 {
 111     // Preflight the vouch: this will tell us the peerID of the recovering peer.
 112     // Then, filter the tlkShares array to include only tlks sent to that peer.
 113     WEAKIFY(self);
 114     [self.deps.cuttlefishXPCWrapper preflightVouchWithBottleWithContainer:self.deps.containerName
 115                                                                   context:self.deps.contextID
 116                                                                  bottleID:self.bottleID
 117                                                                     reply:^(NSString * _Nullable peerID, NSError * _Nullable error) {
 118         STRONGIFY(self);
 119         [[CKKSAnalytics logger] logResultForEvent:OctagonEventPreflightVouchWithBottle hardFailure:true result:error];
 120
 121         if(error){
 122             secerror("octagon: Error preflighting voucher using bottle: %@", error);
 123             self.error = error;
 124             [self runBeforeGroupFinished:self.finishedOp];
 125             return;
 126         }
 127
 128         secnotice("octagon", "Bottle %@ is for peerID %@", self.bottleID, peerID);
 129
 130         NSMutableArray<CKKSTLKShare*>* filteredTLKShares = [NSMutableArray array];
 131         for(CKKSTLKShare* share in tlkShares) {
 132             // If we didn't get a peerID, just pass every tlkshare and hope for the best
 133             if(peerID == nil || [share.receiverPeerID isEqualToString:peerID]) {
 134                 [filteredTLKShares addObject:share];
 135             }
 136         }
 137
 138         [self proceedWithKeys:viewKeySets filteredTLKShares:filteredTLKShares];
 139     }];
 140 }
 141
 142 - (void)proceedWithKeys:(NSArray<CKKSKeychainBackedKeySet*>*)viewKeySets filteredTLKShares:(NSArray<CKKSTLKShare*>*)tlkShares
 143 {
 144     WEAKIFY(self);
 145
 146     [self.deps.cuttlefishXPCWrapper vouchWithBottleWithContainer:self.deps.containerName
 147                                                          context:self.deps.contextID
 148                                                         bottleID:self.bottleID
 149                                                          entropy:self.entropy
 150                                                       bottleSalt:self.bottleSalt
 151                                                        tlkShares:tlkShares
 152                                                            reply:^(NSData * _Nullable voucher, NSData * _Nullable voucherSig, NSError * _Nullable error) {
 153             STRONGIFY(self);
 154             [[CKKSAnalytics logger] logResultForEvent:OctagonEventVoucherWithBottle hardFailure:true result:error];
 155
 156             if(error){
 157                 secerror("octagon: Error preparing voucher using bottle: %@", error);
 158                 self.error = error;
 159                 [self runBeforeGroupFinished:self.finishedOp];
 160                 return;
 161             }
 162
 163             secnotice("octagon", "Received bottle voucher");
 164
 165             self.voucher = voucher;
 166             self.voucherSig = voucherSig;
 167             self.nextState = self.intendedState;
 168             [self runBeforeGroupFinished:self.finishedOp];
 169         }];
 170 }
 171
 172 @end
 173
 174 #endif // OCTAGON