SOSEnsureBackup.m   [plain text]

/*
* Copyright (c) 2017 Apple Inc. All Rights Reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this
* file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
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* @APPLE_LICENSE_HEADER_END@
*/

#import <Foundation/Foundation.h>
#import "SOSEnsureBackup.h"
#include <utilities/debugging.h>

#if OCTAGON
#import "keychain/ckks/CKKSLockStateTracker.h"
#import "keychain/ckks/NSOperationCategories.h"
#include "keychain/SecureObjectSync/SOSAccount.h"

static NSOperationQueue *backupOperationQueue;
static CKKSLockStateTracker *lockStateTracker;

void SOSEnsureBackupWhileUnlocked(void) {
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
backupOperationQueue = [NSOperationQueue new];
lockStateTracker = [CKKSLockStateTracker new];
});

// CKKSLockStateTracker does not use @synchronized(self). If it ever starts to this needs to be updated.
@synchronized(lockStateTracker) {
if ([backupOperationQueue operationCount] > 0) {
secnotice("engine", "SOSEnsureBackup: Backup already scheduled for next unlock");
} else {
secnotice("engine", "SOSEnsureBackup: Scheduling a backup for next unlock");
NSBlockOperation *backupOperation = [NSBlockOperation blockOperationWithBlock:^{
secnotice("engine", "Performing keychain backup after unlock because backing up while locked failed");
SOSAccount *account = (__bridge SOSAccount *)(SOSKeychainAccountGetSharedAccount());

if(!account) {
secnotice("ckks", "Failed to get account object");
return;
}

[account performTransaction:^(SOSAccountTransaction *transaction) {
CFErrorRef error = NULL;
NSSet* set = CFBridgingRelease(SOSAccountCopyBackupPeersAndForceSync(transaction, &error));
if (set) {
secnotice("engine", "SOSEnsureBackup: SOS made a backup of views: %@", set);
} else {
secerror("engine: SOSEnsureBackup: encountered an error while making backup (%@)", error);
}

CFReleaseNull(error);
}];
}];
[backupOperation addNullableDependency:lockStateTracker.unlockDependency];
[backupOperationQueue addOperation:backupOperation];
}
}
}
#else
void SOSEnsureBackupWhileUnlocked(void) {
secnotice("engine", "SOSEnsureBackup not available on this platform");
}
#endif