keychain/ckks/CKKSUpdateDeviceStateOperation.m

   1 /*
   2  * Copyright (c) 2017 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 #include <utilities/SecInternalReleasePriv.h>
  27 #import "keychain/ckks/CKKSKeychainView.h"
  28 #import "keychain/ckks/CKKSUpdateDeviceStateOperation.h"
  29 #import "keychain/ckks/CKKSCurrentKeyPointer.h"
  30 #import "keychain/ckks/CKKSKey.h"
  31 #import "keychain/ckks/CKKSLockStateTracker.h"
  32 #import "keychain/ckks/CKKSSQLDatabaseObject.h"
  33
  34 @interface CKKSUpdateDeviceStateOperation ()
  35 @property CKModifyRecordsOperation* modifyRecordsOperation;
  36 @property CKOperationGroup* group;
  37 @property bool rateLimit;
  38 @end
  39
  40 @implementation CKKSUpdateDeviceStateOperation
  41
  42 - (instancetype)initWithCKKSKeychainView:(CKKSKeychainView*)ckks rateLimit:(bool)rateLimit ckoperationGroup:(CKOperationGroup*)group {
  43     if((self = [super init])) {
  44         _ckks = ckks;
  45         _group = group;
  46         _rateLimit = rateLimit;
  47     }
  48     return self;
  49 }
  50
  51 - (void)groupStart {
  52     CKKSKeychainView* ckks = self.ckks;
  53     if(!ckks) {
  54         ckkserror("ckksdevice", ckks, "no CKKS object");
  55         self.error = [NSError errorWithDomain:@"securityd" code:errSecInternalError userInfo:@{NSLocalizedDescriptionKey: @"no CKKS object"}];
  56         return;
  57     }
  58
  59     CKKSCKAccountStateTracker* accountTracker = ckks.accountTracker;
  60     if(!accountTracker) {
  61         ckkserror("ckksdevice", ckks, "no AccountTracker object");
  62         self.error = [NSError errorWithDomain:@"securityd" code:errSecInternalError userInfo:@{NSLocalizedDescriptionKey: @"no AccountTracker object"}];
  63         return;
  64     }
  65
  66     __weak __typeof(self) weakSelf = self;
  67
  68     // We must have the ck device ID to run this operation.
  69     if([accountTracker.ckdeviceIDInitialized wait:200*NSEC_PER_SEC]) {
  70         ckkserror("ckksdevice", ckks, "CK device ID not initialized, quitting");
  71         self.error = [NSError errorWithDomain:@"securityd" code:errSecInternalError userInfo:@{NSLocalizedDescriptionKey: @"CK device ID not initialized"}];
  72         return;
  73     }
  74
  75     if(!accountTracker.ckdeviceID) {
  76         ckkserror("ckksdevice", ckks, "CK device ID not initialized, quitting");
  77         self.error = [NSError errorWithDomain:@"securityd"
  78                                          code:errSecInternalError
  79                                      userInfo:@{NSLocalizedDescriptionKey: @"CK device ID null", NSUnderlyingErrorKey:CKKSNilToNSNull(accountTracker.ckdeviceIDError)}];
  80         return;
  81     }
  82
  83     [ckks dispatchSyncWithAccountKeys:^bool {
  84         NSError* error = nil;
  85
  86         CKKSDeviceStateEntry* cdse = [ckks _onqueueCurrentDeviceStateEntry:&error];
  87         if(error) {
  88             ckkserror("ckksdevice", ckks, "Error creating device state entry; quitting: %@", error);
  89             return false;
  90         }
  91
  92         if(self.rateLimit) {
  93             NSDate* lastUpdate = cdse.storedCKRecord.modificationDate;
  94
  95             // Only upload this every 3 days (1 day for internal installs)
  96             NSDate* now = [NSDate date];
  97             NSDateComponents* offset = [[NSDateComponents alloc] init];
  98             if(SecIsInternalRelease()) {
  99                 [offset setHour:-23];
 100             } else {
 101                 [offset setHour:-3*24];
 102             }
 103             NSDate* deadline = [[NSCalendar currentCalendar] dateByAddingComponents:offset toDate:now options:0];
 104
 105             if(lastUpdate == nil || [lastUpdate compare: deadline] == NSOrderedAscending) {
 106                 ckksnotice("ckksdevice", ckks, "Not rate-limiting: last updated %@ vs %@", lastUpdate, deadline);
 107             } else {
 108                 ckksnotice("ckksdevice", ckks, "Last update is within 3 days (%@); rate-limiting this operation", lastUpdate);
 109                 self.error =  [NSError errorWithDomain:@"securityd"
 110                                                   code:errSecInternalError
 111                                               userInfo:@{NSLocalizedDescriptionKey: @"Rate-limited the CKKSUpdateDeviceStateOperation"}];
 112                 return false;
 113             }
 114         }
 115
 116         ckksnotice("ckksdevice", ckks, "Saving new device state %@", cdse);
 117
 118         NSArray* recordsToSave = @[[cdse CKRecordWithZoneID:ckks.zoneID]];
 119
 120         // Start a CKModifyRecordsOperation to save this new/updated record.
 121         NSBlockOperation* modifyComplete = [[NSBlockOperation alloc] init];
 122         modifyComplete.name = @"updateDeviceState-modifyRecordsComplete";
 123         [self dependOnBeforeGroupFinished: modifyComplete];
 124
 125         self.modifyRecordsOperation = [[CKModifyRecordsOperation alloc] initWithRecordsToSave:recordsToSave recordIDsToDelete:nil];
 126         self.modifyRecordsOperation.atomic = TRUE;
 127         self.modifyRecordsOperation.qualityOfService = NSQualityOfServiceUtility;
 128         self.modifyRecordsOperation.savePolicy = CKRecordSaveAllKeys; // Overwrite anything in CloudKit: this is our state now
 129         self.modifyRecordsOperation.group = self.group;
 130
 131         self.modifyRecordsOperation.perRecordCompletionBlock = ^(CKRecord *record, NSError * _Nullable error) {
 132             __strong __typeof(weakSelf) strongSelf = weakSelf;
 133             __strong __typeof(strongSelf.ckks) blockCKKS = strongSelf.ckks;
 134
 135             if(!error) {
 136                 ckksnotice("ckksdevice", blockCKKS, "Device state record upload successful for %@: %@", record.recordID.recordName, record);
 137             } else {
 138                 ckkserror("ckksdevice", blockCKKS, "error on row: %@ %@", error, record);
 139             }
 140         };
 141
 142         self.modifyRecordsOperation.modifyRecordsCompletionBlock = ^(NSArray<CKRecord *> *savedRecords, NSArray<CKRecordID *> *deletedRecordIDs, NSError *ckerror) {
 143             __strong __typeof(weakSelf) strongSelf = weakSelf;
 144             __strong __typeof(strongSelf.ckks) strongCKKS = strongSelf.ckks;
 145             if(!strongSelf || !strongCKKS) {
 146                 ckkserror("ckksdevice", strongCKKS, "received callback for released object");
 147                 strongSelf.error = [NSError errorWithDomain:@"securityd" code:errSecInternalError userInfo:@{NSLocalizedDescriptionKey: @"no CKKS object"}];
 148                 [strongSelf runBeforeGroupFinished:modifyComplete];
 149                 return;
 150             }
 151
 152             if(ckerror) {
 153                 ckkserror("ckksdevice", strongCKKS, "CloudKit returned an error: %@", ckerror);
 154                 strongSelf.error = ckerror;
 155                 [strongSelf runBeforeGroupFinished:modifyComplete];
 156                 return;
 157             }
 158
 159             __block NSError* error = nil;
 160
 161             [strongCKKS dispatchSync: ^bool{
 162                 for(CKRecord* record in savedRecords) {
 163                     // Save the item records
 164                     if([record.recordType isEqualToString: SecCKRecordDeviceStateType]) {
 165                         CKKSDeviceStateEntry* newcdse = [[CKKSDeviceStateEntry alloc] initWithCKRecord:record];
 166                         [newcdse saveToDatabase:&error];
 167                         if(error) {
 168                             ckkserror("ckksdevice", strongCKKS, "Couldn't save new device state(%@) to database: %@", newcdse, error);
 169                         }
 170                     }
 171                 }
 172                 return true;
 173             }];
 174
 175             strongSelf.error = error;
 176             [strongSelf runBeforeGroupFinished:modifyComplete];
 177         };
 178
 179         [self dependOnBeforeGroupFinished: self.modifyRecordsOperation];
 180         [ckks.database addOperation: self.modifyRecordsOperation];
 181
 182         return true;
 183     }];
 184 }
 185
 186 @end
 187
 188 #endif // OCTAGON