OSX/sec/SOSCircle/SecureObjectSync/SOSEnsureBackup.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 #import <Foundation/Foundation.h>
  25 #import "SOSEnsureBackup.h"
  26 #include <utilities/debugging.h>
  27
  28 #if TARGET_OS_OSX || TARGET_OS_IOS
  29 #import "keychain/ckks/CKKSLockStateTracker.h"
  30 #include <Security/SecureObjectSync/SOSAccount.h>
  31 #import <WirelessDiagnostics/WirelessDiagnostics.h>
  32 #import "keychain/analytics/awd/AWDMetricIds_Keychain.h"
  33
  34 static NSOperationQueue *backupOperationQueue;
  35 static CKKSLockStateTracker *lockStateTracker;
  36
  37 void SOSEnsureBackupWhileUnlocked(void) {
  38     static dispatch_once_t onceToken;
  39     dispatch_once(&onceToken, ^{
  40         backupOperationQueue = [NSOperationQueue new];
  41         lockStateTracker = [CKKSLockStateTracker new];
  42     });
  43
  44     // CKKSLockStateTracker does not use @synchronized(self). If it ever starts to this needs to be updated.
  45     @synchronized(lockStateTracker) {
  46         if ([backupOperationQueue operationCount] > 0) {
  47             secnotice("engine", "SOSEnsureBackup: Backup already scheduled for next unlock");
  48         } else {
  49             secnotice("engine", "SOSEnsureBackup: Scheduling a backup for next unlock");
  50             NSBlockOperation *backupOperation = [NSBlockOperation blockOperationWithBlock:^{
  51                 secnotice("engine", "Performing keychain backup after unlock because backing up while locked failed");
  52                 SOSAccount *account = (__bridge SOSAccount *)(SOSKeychainAccountGetSharedAccount());
  53                 SOSAccountTransaction* transaction = [SOSAccountTransaction transactionWithAccount:account];
  54                 CFErrorRef error = NULL;
  55                 CFSetRef set = SOSAccountCopyBackupPeersAndForceSync(transaction, &error);
  56                 if (set) {
  57                     secnotice("engine", "SOSEnsureBackup: SOS made a backup of views: %@", set);
  58                 } else {
  59                     secerror("engine: SOSEnsureBackup: encountered an error while making backup (%@)", error);
  60                 }
  61
  62                 CFReleaseNull(error);
  63                 CFReleaseNull(set);
  64             }];
  65             [backupOperation addDependency:lockStateTracker.unlockDependency];
  66             [backupOperationQueue addOperation:backupOperation];
  67             AWDPostSimpleMetric(AWDMetricId_Keychain_SOSKeychainBackupFailed);
  68         }
  69     }
  70 }
  71 #else
  72 void SOSEnsureBackupWhileUnlocked(void) {
  73     secnotice("engine", "SOSEnsureBackup not available on this platform");
  74 }
  75 #endif