OSX/sec/SOSCircle/IDSKeychainSyncingProxy/idskeychainsyncingproxy.m

   1 /*
   2  * Copyright (c) 2012-2014 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 #include <AssertMacros.h>
  25
  26 #import <Foundation/Foundation.h>
  27 #import <Security/Security.h>
  28 #import <utilities/SecCFRelease.h>
  29 #import <xpc/xpc.h>
  30 #import <xpc/private.h>
  31 #import <CoreFoundation/CFXPCBridge.h>
  32 #import <sysexits.h>
  33 #import <syslog.h>
  34 #import <CommonCrypto/CommonDigest.h>
  35 #include <utilities/SecXPCError.h>
  36 #include <TargetConditionals.h>
  37 #include "SOSCloudKeychainConstants.h"
  38
  39
  40 #import "IDSProxy.h"
  41
  42 int idsproxymain(int argc, const char *argv[]);
  43
  44 #define PROXYXPCSCOPE "idsproxy"
  45
  46 static void describeXPCObject(char *prefix, xpc_object_t object)
  47 {
  48     // This is useful for debugging.
  49     if (object)
  50     {
  51         char *desc = xpc_copy_description(object);
  52         secdebug(PROXYXPCSCOPE, "%s%s\n", prefix, desc);
  53         free(desc);
  54     }
  55     else
  56         secdebug(PROXYXPCSCOPE, "%s<NULL>\n", prefix);
  57
  58 }
  59
  60 static void idskeychainsyncingproxy_peer_dictionary_handler(const xpc_connection_t peer, xpc_object_t event)
  61 {
  62     bool result = false;
  63     int err = 0;
  64
  65     require_action_string(xpc_get_type(event) == XPC_TYPE_DICTIONARY, xit, err = -51, "expected XPC_TYPE_DICTIONARY");
  66
  67     const char *operation = xpc_dictionary_get_string(event, kMessageKeyOperation);
  68     require_action(operation, xit, result = false);
  69
  70     // Check protocol version
  71     uint64_t version = xpc_dictionary_get_uint64(event, kMessageKeyVersion);
  72     secdebug(PROXYXPCSCOPE, "Reply version: %lld\n", version);
  73     require_action(version == kCKDXPCVersion, xit, result = false);
  74
  75     // Operations
  76     secdebug(PROXYXPCSCOPE, "Handling %s operation", operation);
  77
  78
  79     if(operation && !strcmp(operation, kOperationGetDeviceID)){
  80         NSError *error;
  81         BOOL object = [[IDSKeychainSyncingProxy idsProxy] doSetIDSDeviceID:&error];
  82         xpc_object_t replyMessage = xpc_dictionary_create_reply(event);
  83         xpc_dictionary_set_bool(replyMessage, kMessageKeyValue, object);
  84
  85         if(error){
  86             xpc_object_t xerrobj = SecCreateXPCObjectWithCFError((__bridge CFErrorRef)(error));
  87             xpc_dictionary_set_value(replyMessage, kMessageKeyError, xerrobj);
  88         }
  89         xpc_connection_send_message(peer, replyMessage);
  90         secdebug(PROXYXPCSCOPE, "Set our IDS Device ID message sent");
  91
  92     }
  93     else if (operation && !strcmp(operation, kOperationSendIDSMessage))
  94     {
  95         xpc_object_t xidsMessageData = xpc_dictionary_get_value(event, kMessageKeyValue);
  96         xpc_object_t xDeviceName = xpc_dictionary_get_value(event, kMessageKeyDeviceName);
  97         xpc_object_t xPeerID = xpc_dictionary_get_value(event, kMessageKeyPeerID);
  98
  99         NSString *deviceName = (__bridge_transfer NSString*)(_CFXPCCreateCFObjectFromXPCObject(xDeviceName));
 100         NSString *peerID = (__bridge_transfer NSString*)(_CFXPCCreateCFObjectFromXPCObject(xPeerID));
 101         NSDictionary *messageData = (__bridge_transfer NSDictionary*)(_CFXPCCreateCFObjectFromXPCObject(xidsMessageData));
 102         NSError *error = NULL;
 103
 104         BOOL object = [[IDSKeychainSyncingProxy idsProxy] sendIDSMessage:messageData name:deviceName peer:peerID error:&error];
 105
 106         xpc_object_t replyMessage = xpc_dictionary_create_reply(event);
 107         xpc_dictionary_set_bool(replyMessage, kMessageKeyValue, object);
 108
 109         if(error){
 110             xpc_object_t xerrobj = SecCreateXPCObjectWithCFError((__bridge CFErrorRef)(error));
 111             xpc_dictionary_set_value(replyMessage, kMessageKeyError, xerrobj);
 112         }
 113         xpc_connection_send_message(peer, replyMessage);
 114         secdebug(PROXYXPCSCOPE, "IDS message sent");
 115
 116     }
 117     else
 118     {
 119         char *description = xpc_copy_description(event);
 120         secdebug(PROXYXPCSCOPE, "Unknown op=%s request from pid %d: %s", operation, xpc_connection_get_pid(peer), description);
 121         free(description);
 122     }
 123     result = true;
 124 xit:
 125     if (!result)
 126         describeXPCObject("handle_operation fail: ", event);
 127 }
 128
 129
 130 static void initializeProxyObjectWithConnection(const xpc_connection_t connection)
 131 {
 132     [[IDSKeychainSyncingProxy idsProxy] setItemsChangedBlock:^CFArrayRef(CFDictionaryRef values)
 133      {
 134          secdebug(PROXYXPCSCOPE, "IDSKeychainSyncingProxy called back");
 135          xpc_object_t xobj = _CFXPCCreateXPCObjectFromCFObject(values);
 136          xpc_object_t message = xpc_dictionary_create(NULL, NULL, 0);
 137          xpc_dictionary_set_uint64(message, kMessageKeyVersion, kCKDXPCVersion);
 138          xpc_dictionary_set_string(message, kMessageKeyOperation, kMessageOperationItemChanged);
 139          xpc_dictionary_set_value(message, kMessageKeyValue, xobj?xobj:xpc_null_create());
 140          xpc_connection_send_message(connection, message);  // Send message; don't wait for a reply
 141          return NULL;
 142      }];
 143 }
 144
 145 static void idskeychainsyncingproxy_peer_event_handler(xpc_connection_t peer, xpc_object_t event)
 146 {
 147     describeXPCObject("peer: ", peer);
 148         xpc_type_t type = xpc_get_type(event);
 149         if (type == XPC_TYPE_ERROR) {
 150                 if (event == XPC_ERROR_CONNECTION_INVALID) {
 151                         // The client process on the other end of the connection has either
 152                         // crashed or cancelled the connection. After receiving this error,
 153                         // the connection is in an invalid state, and you do not need to
 154                         // call xpc_connection_cancel(). Just tear down any associated state
 155                         // here.
 156                 } else if (event == XPC_ERROR_TERMINATION_IMMINENT) {
 157                         // Handle per-connection termination cleanup.
 158                 }
 159         } else {
 160                 assert(type == XPC_TYPE_DICTIONARY);
 161                 // Handle the message.
 162     //    describeXPCObject("dictionary:", event);
 163         dispatch_async(dispatch_get_main_queue(), ^{
 164             idskeychainsyncingproxy_peer_dictionary_handler(peer, event);
 165         });
 166         }
 167 }
 168
 169 static void idskeychainsyncingproxy_event_handler(xpc_connection_t peer)
 170 {
 171         // By defaults, new connections will target the default dispatch
 172         // concurrent queue.
 173
 174     if (xpc_get_type(peer) != XPC_TYPE_CONNECTION)
 175     {
 176         secdebug(PROXYXPCSCOPE, "expected XPC_TYPE_CONNECTION");
 177         return;
 178     }
 179     initializeProxyObjectWithConnection(peer);
 180         xpc_connection_set_event_handler(peer, ^(xpc_object_t event)
 181     {
 182         idskeychainsyncingproxy_peer_event_handler(peer, event);
 183         });
 184
 185         // This will tell the connection to begin listening for events. If you
 186         // have some other initialization that must be done asynchronously, then
 187         // you can defer this call until after that initialization is done.
 188         xpc_connection_resume(peer);
 189 }
 190
 191 int idsproxymain(int argc, const char *argv[])
 192 {
 193     secdebug(PROXYXPCSCOPE, "Starting IDSProxy");
 194     char *wait4debugger = getenv("WAIT4DEBUGGER");
 195
 196     if (wait4debugger && !strcasecmp("YES", wait4debugger))
 197     {
 198         syslog(LOG_ERR, "Waiting for debugger");
 199         kill(getpid(), SIGTSTP);
 200     }
 201
 202     // DISPATCH_TARGET_QUEUE_DEFAULT
 203         xpc_connection_t listener = xpc_connection_create_mach_service(xpcIDSServiceName, NULL, XPC_CONNECTION_MACH_SERVICE_LISTENER);
 204         xpc_connection_set_event_handler(listener, ^(xpc_object_t object){ idskeychainsyncingproxy_event_handler(object); });
 205
 206     [IDSKeychainSyncingProxy idsProxy];
 207
 208     // It looks to me like there is insufficient locking to allow a request to come in on the XPC connection while doing the initial all items.
 209     // Therefore I'm leaving the XPC connection suspended until that has time to process.
 210         xpc_connection_resume(listener);
 211
 212     @autoreleasepool
 213     {
 214         secdebug(PROXYXPCSCOPE, "Starting mainRunLoop");
 215         NSRunLoop *runLoop = [NSRunLoop mainRunLoop];
 216         [runLoop run];
 217     }
 218
 219     secdebug(PROXYXPCSCOPE, "Exiting IDSKeychainSyncingProxy");
 220
 221     return EXIT_FAILURE;
 222 }