keychain/ckks/CKKSReencryptOutgoingItemsOperation.m

   1 /*
   2  * Copyright (c) 2016 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 "keychain/ckks/CKKS.h"
  25 #import "keychain/ckks/CKKSKeychainView.h"
  26 #import "keychain/ckks/CKKSCurrentKeyPointer.h"
  27 #import "keychain/ckks/CKKSKey.h"
  28 #import "keychain/ckks/CKKSOutgoingQueueEntry.h"
  29 #import "keychain/ckks/CKKSReencryptOutgoingItemsOperation.h"
  30 #import "keychain/ckks/CKKSItemEncrypter.h"
  31 #import "keychain/ckks/CloudKitCategories.h"
  32
  33 #if OCTAGON
  34
  35 // Note: reencryption is not, strictly speaking, a CloudKit operation. However, we preserve this to pass it back to the outgoing queue operation we'll create
  36 @interface CKKSReencryptOutgoingItemsOperation ()
  37 @property CKOperationGroup* ckoperationGroup;
  38 @end
  39
  40 @implementation CKKSReencryptOutgoingItemsOperation
  41
  42 - (instancetype)init {
  43     return nil;
  44 }
  45 - (instancetype)initWithCKKSKeychainView:(CKKSKeychainView*)ckks ckoperationGroup:(CKOperationGroup*)ckoperationGroup {
  46     if(self = [super init]) {
  47         _ckks = ckks;
  48         _ckoperationGroup = ckoperationGroup;
  49
  50         [self addNullableDependency:ckks.viewSetupOperation];
  51         [self addNullableDependency:ckks.holdReencryptOutgoingItemsOperation];
  52
  53         // We also depend on the key hierarchy being reasonable
  54         [self addNullableDependency:ckks.keyStateReadyDependency];
  55
  56     }
  57     return self;
  58 }
  59
  60 - (void) main {
  61     CKKSKeychainView* ckks = self.ckks;
  62     if(!ckks) {
  63         ckkserror("ckksreencrypt", ckks, "no CKKS object");
  64         return;
  65     }
  66
  67     [ckks dispatchSync: ^bool{
  68         if(self.cancelled) {
  69             ckksnotice("ckksreencrypt", ckks, "CKKSReencryptOutgoingItemsOperation cancelled, quitting");
  70             return false;
  71         }
  72
  73         ckks.lastReencryptOutgoingItemsOperation = self;
  74
  75         NSError* error = nil;
  76         bool newItems = false;
  77
  78         NSArray<CKKSOutgoingQueueEntry*>* oqes = [CKKSOutgoingQueueEntry allInState: SecCKKSStateReencrypt zoneID:ckks.zoneID error:&error];
  79         if(error) {
  80             ckkserror("ckksreencrypt", ckks, "Error fetching oqes from database: %@", error);
  81             self.error = error;
  82             return false;
  83         }
  84
  85         for(CKKSOutgoingQueueEntry* oqe in oqes) {
  86             // If there's already a 'new' item replacing this one, drop the reencryption on the floor
  87             CKKSOutgoingQueueEntry* newOQE = [CKKSOutgoingQueueEntry tryFromDatabase:oqe.uuid state:SecCKKSStateNew zoneID:oqe.item.zoneID error:&error];
  88             if(error) {
  89                 ckkserror("ckksreencrypt", ckks, "Couldn't load 'new' OQE to determine status: %@", error);
  90                 self.error = error;
  91                 error = nil;
  92                 continue;
  93             }
  94             if(newOQE) {
  95                 ckksnotice("ckksreencrypt", ckks, "Have a new OQE superceding %@ (%@), skipping", oqe, newOQE);
  96                 // Don't use the state transition here, either, since this item isn't really changing states
  97                 [oqe deleteFromDatabase:&error];
  98                 if(error) {
  99                     ckkserror("ckksreencrypt", ckks, "Couldn't delete reencrypting OQE(%@) from database: %@", oqe, error);
 100                     self.error = error;
 101                     error = nil;
 102                     continue;
 103                 }
 104                 continue;
 105             }
 106
 107             ckksnotice("ckksreencrypt", ckks, "Reencrypting item %@", oqe);
 108
 109             NSDictionary* item = [CKKSItemEncrypter decryptItemToDictionary: oqe.item error:&error];
 110             if(error) {
 111                 if ([error.domain isEqualToString:@"securityd"] && error.code == errSecItemNotFound) {
 112                     ckkserror("ckksreencrypt", ckks, "Coudn't find key in keychain; attempting to poke key hierarchy: %@", error)
 113                     [ckks _onqueueAdvanceKeyStateMachineToState: nil withError: nil];
 114                 } else {
 115                     ckkserror("ckksreencrypt", ckks, "Couldn't decrypt item %@: %@", oqe, error);
 116                 }
 117                 self.error = error;
 118                 error = nil;
 119                 continue;
 120             }
 121
 122             // Pick a key whose class matches the keyclass that this item
 123             CKKSKey* originalKey = [CKKSKey fromDatabase: oqe.item.parentKeyUUID zoneID:ckks.zoneID error:&error];
 124             if(error) {
 125                 ckkserror("ckksreencrypt", ckks, "Couldn't fetch key (%@) for item %@: %@", oqe.item.parentKeyUUID, oqe, error);
 126                 self.error = error;
 127                 error = nil;
 128                 continue;
 129             }
 130
 131             CKKSKey* newkey = [CKKSKey currentKeyForClass: originalKey.keyclass zoneID:ckks.zoneID error:&error];
 132             [newkey ensureKeyLoaded: &error];
 133             if(error) {
 134                 ckkserror("ckksreencrypt", ckks, "Couldn't fetch the current key for class %@: %@", originalKey.keyclass, error);
 135                 self.error = error;
 136                 error = nil;
 137                 continue;
 138             }
 139
 140             CKKSMirrorEntry* ckme = [CKKSMirrorEntry tryFromDatabase:oqe.item.uuid zoneID:ckks.zoneID error:&error];
 141             if(error) {
 142                 ckkserror("ckksreencrypt", ckks, "Couldn't fetch ckme (%@) for item %@: %@", oqe.item.parentKeyUUID, oqe, error);
 143                 self.error = error;
 144                 error = nil;
 145                 continue;
 146             }
 147
 148             CKKSItem* encryptedItem = [CKKSItemEncrypter encryptCKKSItem:oqe.item
 149                                                           dataDictionary:item
 150                                                         updatingCKKSItem:ckme.item
 151                                                                parentkey:newkey
 152                                                                    error:&error];
 153
 154             if(error) {
 155                 ckkserror("ckksreencrypt", ckks, "Couldn't encrypt under the new key %@: %@", newkey, error);
 156                 self.error = error;
 157                 error = nil;
 158                 continue;
 159             }
 160
 161             CKKSOutgoingQueueEntry* replacement = [[CKKSOutgoingQueueEntry alloc] initWithCKKSItem:encryptedItem
 162                                                                                             action:oqe.action
 163                                                                                              state:SecCKKSStateNew
 164                                                                                          waitUntil:nil
 165                                                                                        accessGroup:oqe.accessgroup];
 166
 167             // Don't use the CKKSKeychainView state change here, since we're doing a wholesale item swap.
 168             [oqe deleteFromDatabase:&error];
 169             [replacement saveToDatabase:&error];
 170             if(error) {
 171                 ckkserror("ckksreencrypt", ckks, "Couldn't save newly-encrypted oqe %@: %@", replacement, error);
 172                 self.error = error;
 173                 error = nil;
 174                 continue;
 175             }
 176
 177             newItems = true;
 178         }
 179
 180         if(newItems) {
 181             [ckks processOutgoingQueue:self.ckoperationGroup];
 182         }
 183         return true;
 184     }];
 185 }
 186
 187 @end;
 188
 189 #endif