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 "IDSKeychainSyncingProxy+IDSProxyThrottle.h"
  41 #import "IDSKeychainSyncingProxy+IDSProxySendMessage.h"
  42
  43 int idsproxymain(int argc, const char *argv[]);
  44
  45 #define PROXYXPCSCOPE "idsproxy"
  46
  47 static void describeXPCObject(char *prefix, xpc_object_t object)
  48 {
  49     // This is useful for debugging.
  50     if (object)
  51     {
  52         char *desc = xpc_copy_description(object);
  53         secdebug(PROXYXPCSCOPE, "%s%s\n", prefix, desc);
  54         free(desc);
  55     }
  56     else
  57         secdebug(PROXYXPCSCOPE, "%s<NULL>\n", prefix);
  58
  59 }
  60
  61 static void idskeychainsyncingproxy_peer_dictionary_handler(const xpc_connection_t peer, xpc_object_t event)
  62 {
  63     bool result = false;
  64     int err = 0;
  65
  66     require_action_string(xpc_get_type(event) == XPC_TYPE_DICTIONARY, xit, err = -51, "expected XPC_TYPE_DICTIONARY");
  67
  68     const char *operation = xpc_dictionary_get_string(event, kMessageKeyOperation);
  69     require_action(operation, xit, result = false);
  70
  71     // Check protocol version
  72     uint64_t version = xpc_dictionary_get_uint64(event, kMessageKeyVersion);
  73     secdebug(PROXYXPCSCOPE, "Reply version: %lld\n", version);
  74     require_action(version == kCKDXPCVersion, xit, result = false);
  75
  76     // Operations
  77     secdebug(PROXYXPCSCOPE, "Handling %s operation", operation);
  78
  79
  80     if(operation && !strcmp(operation, kOperationGetDeviceID)){
  81         [[IDSKeychainSyncingProxy idsProxy] doSetIDSDeviceID];
  82         xpc_object_t replyMessage = xpc_dictionary_create_reply(event);
  83         xpc_dictionary_set_bool(replyMessage, kMessageKeyValue, true);
  84         xpc_connection_send_message(peer, replyMessage);
  85         secdebug(PROXYXPCSCOPE, "Set our IDS Device ID message sent");
  86
  87     }
  88     else if (operation && !strcmp(operation, kOperationSendFragmentedIDSMessage))
  89     {
  90         xpc_object_t xidsMessageData = xpc_dictionary_get_value(event, kMessageKeyValue);
  91         xpc_object_t xDeviceName = xpc_dictionary_get_value(event, kMessageKeyDeviceName);
  92         xpc_object_t xPeerID = xpc_dictionary_get_value(event, kMessageKeyPeerID);
  93         BOOL object = false;
  94
  95         NSString *deviceName = (__bridge_transfer NSString*)(_CFXPCCreateCFObjectFromXPCObject(xDeviceName));
  96         NSString *peerID = (__bridge_transfer NSString*)(_CFXPCCreateCFObjectFromXPCObject(xPeerID));
  97         NSDictionary *messageDictionary = (__bridge_transfer NSDictionary*)(_CFXPCCreateCFObjectFromXPCObject(xidsMessageData));
  98         NSError *error = NULL;
  99         bool isNameString = (CFGetTypeID((__bridge CFTypeRef)(deviceName)) == CFStringGetTypeID());
 100         bool isPeerIDString = (CFGetTypeID((__bridge CFTypeRef)(peerID)) == CFStringGetTypeID());
 101         bool isMessageDictionary = (CFGetTypeID((__bridge CFTypeRef)(messageDictionary)) == CFDictionaryGetTypeID());
 102
 103         require_quiet(isNameString, xit);
 104         require_quiet(isPeerIDString, xit);
 105         require_quiet(isMessageDictionary, xit);
 106
 107         [[IDSKeychainSyncingProxy idsProxy] recordTimestampOfWriteToIDS: messageDictionary deviceName:deviceName peerID:peerID];
 108         NSDictionary *safeValues = [[IDSKeychainSyncingProxy idsProxy] filterForWritableValues:messageDictionary];
 109
 110         if(safeValues != nil && [safeValues count] > 0){
 111             object = [[IDSKeychainSyncingProxy idsProxy] sendFragmentedIDSMessages:safeValues name:deviceName peer:peerID error:&error];
 112         }
 113
 114         xpc_object_t replyMessage = xpc_dictionary_create_reply(event);
 115         xpc_dictionary_set_bool(replyMessage, kMessageKeyValue, object);
 116
 117         if(error){
 118             xpc_object_t xerrobj = SecCreateXPCObjectWithCFError((__bridge CFErrorRef)(error));
 119             xpc_dictionary_set_value(replyMessage, kMessageKeyError, xerrobj);
 120         }
 121         xpc_connection_send_message(peer, replyMessage);
 122         secdebug(PROXYXPCSCOPE, "IDS message sent");
 123     }
 124     else if(operation && !strcmp(operation, kOperationSendDeviceList)) //IDS device availability check
 125     {
 126         xpc_object_t xidsDeviceList = xpc_dictionary_get_value(event, kMessageKeyValue);
 127         xpc_object_t xPeerID = xpc_dictionary_get_value(event, kMessageKeyPeerID);
 128
 129         NSArray *idsList = (__bridge_transfer NSArray*)(_CFXPCCreateCFObjectFromXPCObject(xidsDeviceList));
 130         NSString *peerID = (__bridge_transfer NSString*)(_CFXPCCreateCFObjectFromXPCObject(xPeerID));
 131
 132         bool isMessageArray = (CFGetTypeID((__bridge CFTypeRef)(idsList)) == CFArrayGetTypeID());
 133         bool isPeerIDString = (CFGetTypeID((__bridge CFTypeRef)(peerID)) == CFStringGetTypeID());
 134
 135         require_quiet(isMessageArray, xit);
 136         require_quiet(isPeerIDString, xit);
 137
 138         [[IDSKeychainSyncingProxy idsProxy] pingDevices:idsList peerID:peerID];
 139
 140         xpc_object_t replyMessage = xpc_dictionary_create_reply(event);
 141         xpc_dictionary_set_bool(replyMessage, kMessageKeyValue, true);
 142
 143         xpc_connection_send_message(peer, replyMessage);
 144         secdebug(PROXYXPCSCOPE, "IDS device list sent");
 145     }
 146     else if (operation && !strcmp(operation, kOperationSendIDSMessage)) //for IDS tests
 147     {
 148         xpc_object_t xidsMessageData = xpc_dictionary_get_value(event, kMessageKeyValue);
 149         xpc_object_t xDeviceName = xpc_dictionary_get_value(event, kMessageKeyDeviceName);
 150         xpc_object_t xPeerID = xpc_dictionary_get_value(event, kMessageKeyPeerID);
 151         BOOL object = false;
 152
 153         NSString *deviceName = (__bridge_transfer NSString*)(_CFXPCCreateCFObjectFromXPCObject(xDeviceName));
 154         NSString *peerID = (__bridge_transfer NSString*)(_CFXPCCreateCFObjectFromXPCObject(xPeerID));
 155         NSDictionary *messageDictionary = (__bridge_transfer NSDictionary*)(_CFXPCCreateCFObjectFromXPCObject(xidsMessageData));
 156         NSError *error = NULL;
 157         bool isNameString = (CFGetTypeID((__bridge CFTypeRef)(deviceName)) == CFStringGetTypeID());
 158         bool isPeerIDString = (CFGetTypeID((__bridge CFTypeRef)(peerID)) == CFStringGetTypeID());
 159         bool isMessageDictionary = (CFGetTypeID((__bridge CFTypeRef)(messageDictionary)) == CFDictionaryGetTypeID());
 160
 161         require_quiet(isNameString, xit);
 162         require_quiet(isPeerIDString, xit);
 163         require_quiet(isMessageDictionary, xit);
 164
 165         NSString *identifier = [NSString string];
 166         object = [[IDSKeychainSyncingProxy idsProxy] sendIDSMessage:messageDictionary name:deviceName peer:peerID identifier:&identifier error:&error];
 167
 168         xpc_object_t replyMessage = xpc_dictionary_create_reply(event);
 169         xpc_dictionary_set_bool(replyMessage, kMessageKeyValue, object);
 170
 171         if(error){
 172             xpc_object_t xerrobj = SecCreateXPCObjectWithCFError((__bridge CFErrorRef)(error));
 173             xpc_dictionary_set_value(replyMessage, kMessageKeyError, xerrobj);
 174         }
 175         xpc_connection_send_message(peer, replyMessage);
 176         secdebug(PROXYXPCSCOPE, "IDS message sent");
 177     }
 178
 179     else
 180     {
 181         char *description = xpc_copy_description(event);
 182         secdebug(PROXYXPCSCOPE, "Unknown op=%s request from pid %d: %s", operation, xpc_connection_get_pid(peer), description);
 183         free(description);
 184     }
 185     result = true;
 186 xit:
 187     if (!result)
 188         describeXPCObject("handle_operation fail: ", event);
 189 }
 190
 191 static void idskeychainsyncingproxy_peer_event_handler(xpc_connection_t peer, xpc_object_t event)
 192 {
 193     describeXPCObject("peer: ", peer);
 194         xpc_type_t type = xpc_get_type(event);
 195         if (type == XPC_TYPE_ERROR) {
 196                 if (event == XPC_ERROR_CONNECTION_INVALID) {
 197                         // The client process on the other end of the connection has either
 198                         // crashed or cancelled the connection. After receiving this error,
 199                         // the connection is in an invalid state, and you do not need to
 200                         // call xpc_connection_cancel(). Just tear down any associated state
 201                         // here.
 202                 } else if (event == XPC_ERROR_TERMINATION_IMMINENT) {
 203                         // Handle per-connection termination cleanup.
 204                 }
 205         } else {
 206                 assert(type == XPC_TYPE_DICTIONARY);
 207                 // Handle the message.
 208     //    describeXPCObject("dictionary:", event);
 209         dispatch_async(dispatch_get_main_queue(), ^{
 210             idskeychainsyncingproxy_peer_dictionary_handler(peer, event);
 211         });
 212         }
 213 }
 214
 215 static void idskeychainsyncingproxy_event_handler(xpc_connection_t peer)
 216 {
 217         // By defaults, new connections will target the default dispatch
 218         // concurrent queue.
 219
 220     if (xpc_get_type(peer) != XPC_TYPE_CONNECTION)
 221     {
 222         secdebug(PROXYXPCSCOPE, "expected XPC_TYPE_CONNECTION");
 223         return;
 224     }
 225
 226     xpc_connection_set_event_handler(peer, ^(xpc_object_t event)
 227     {
 228         idskeychainsyncingproxy_peer_event_handler(peer, event);
 229         });
 230
 231         // This will tell the connection to begin listening for events. If you
 232         // have some other initialization that must be done asynchronously, then
 233         // you can defer this call until after that initialization is done.
 234         xpc_connection_resume(peer);
 235 }
 236
 237 int idsproxymain(int argc, const char *argv[])
 238 {
 239     secdebug(PROXYXPCSCOPE, "Starting IDSProxy");
 240     char *wait4debugger = getenv("WAIT4DEBUGGER");
 241
 242     if (wait4debugger && !strcasecmp("YES", wait4debugger))
 243     {
 244         syslog(LOG_ERR, "Waiting for debugger");
 245         kill(getpid(), SIGTSTP);
 246     }
 247
 248     // DISPATCH_TARGET_QUEUE_DEFAULT
 249         xpc_connection_t listener = xpc_connection_create_mach_service(xpcIDSServiceName, NULL, XPC_CONNECTION_MACH_SERVICE_LISTENER);
 250         xpc_connection_set_event_handler(listener, ^(xpc_object_t object){ idskeychainsyncingproxy_event_handler(object); });
 251
 252     [IDSKeychainSyncingProxy idsProxy];
 253
 254     // 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.
 255     // Therefore I'm leaving the XPC connection suspended until that has time to process.
 256         xpc_connection_resume(listener);
 257
 258     @autoreleasepool
 259     {
 260         secdebug(PROXYXPCSCOPE, "Starting mainRunLoop");
 261         NSRunLoop *runLoop = [NSRunLoop mainRunLoop];
 262         [runLoop run];
 263     }
 264
 265     secdebug(PROXYXPCSCOPE, "Exiting IDSKeychainSyncingProxy");
 266
 267     return EXIT_FAILURE;
 268 }
 269
 270 int main(int argc, const char *argv[])
 271 {
 272     return idsproxymain(argc, argv);
 273 }