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