Security-59306.11.20.tar.gz

[apple/security.git] / keychain / SecureObjectSync / SOSEnsureBackup.m

diff --git a/keychain/SecureObjectSync/SOSEnsureBackup.m b/keychain/SecureObjectSync/SOSEnsureBackup.m
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+/*
+ * 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
+ * limitations under the License.
+ *
+ * @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