OSX/sec/ipc/client.c

   1 /*
   2  * Copyright (c) 2007-2009,2012-2015 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 <TargetConditionals.h>
  25
  26 // client.c is from the iOS world and must compile with an iOS view of the headers
  27 #ifndef SEC_IOS_ON_OSX
  28 #define SEC_IOS_ON_OSX 1
  29 #endif // SEC_IOS_ON_OSX
  30
  31 #if TARGET_OS_OSX
  32 #ifndef SECITEM_SHIM_OSX
  33 #define SECITEM_SHIM_OSX 1
  34 #endif // SECITEM_SHIM_OSX
  35 #endif // TARGET_OS_OSX
  36
  37 #include <stdbool.h>
  38 #include <sys/queue.h>
  39 #include <syslog.h>
  40 #include <vproc_priv.h>
  41 #include <xpc/xpc.h>
  42 #include <xpc/private.h>
  43
  44 #include <CoreFoundation/CoreFoundation.h>
  45 #include <Security/SecItem.h>
  46 #include <Security/SecBasePriv.h>
  47 #include <Security/SecInternal.h>
  48 #include <Security/SecuritydXPC.h>
  49 #include <Security/SecTask.h>
  50 #include <Security/SecItemPriv.h>
  51
  52 #include <utilities/debugging.h>
  53 #include <utilities/SecCFError.h>
  54 #include <utilities/SecXPCError.h>
  55 #include <utilities/SecCFWrappers.h>
  56 #include <utilities/SecDispatchRelease.h>
  57 #include <utilities/SecDb.h> // TODO Fixme this gets us SecError().
  58 #include <utilities/SecAKSWrappers.h>
  59 #include <ipc/securityd_client.h>
  60
  61 struct securityd *gSecurityd;
  62 struct trustd *gTrustd;
  63
  64 //
  65 // MARK: XPC IPC.
  66 //
  67
  68 /* Hardcoded Access Groups for the server itself */
  69 static CFArrayRef SecServerCopyAccessGroups(void) {
  70     return CFArrayCreateForCFTypes(kCFAllocatorDefault,
  71 #if NO_SERVER
  72                                    CFSTR("test"),
  73                                    CFSTR("apple"),
  74                                    CFSTR("lockdown-identities"),
  75                                    CFSTR("123456.test.group"),
  76                                    CFSTR("123456.test.group2"),
  77 #else
  78                                    CFSTR("sync"),
  79 #endif
  80                                    CFSTR("com.apple.security.sos"),
  81                                    CFSTR("com.apple.security.ckks"),
  82                                    CFSTR("com.apple.security.sos-usercredential"),
  83                                    CFSTR("com.apple.sbd"),
  84                                    CFSTR("com.apple.lakitu"),
  85                                    kSecAttrAccessGroupToken,
  86                                    NULL);
  87 }
  88
  89 static SecurityClient gClient;
  90
  91 #if TARGET_OS_IOS
  92 void
  93 SecSecuritySetMusrMode(bool mode, uid_t uid, int activeUser)
  94 {
  95     gClient.inMultiUser = mode;
  96     gClient.uid = uid;
  97     gClient.activeUser = activeUser;
  98 }
  99 #endif
 100
 101 SecurityClient *
 102 SecSecurityClientGet(void)
 103 {
 104     static dispatch_once_t onceToken;
 105     dispatch_once(&onceToken, ^{
 106         gClient.task = NULL;
 107         gClient.accessGroups = SecServerCopyAccessGroups();
 108         gClient.allowSystemKeychain = true;
 109         gClient.allowSyncBubbleKeychain = true;
 110         gClient.isNetworkExtension = false;
 111 #if TARGET_OS_IPHONE
 112         gClient.inMultiUser = false;
 113         gClient.activeUser = 501;
 114 #endif
 115     });
 116     return &gClient;
 117 }
 118
 119 CFArrayRef SecAccessGroupsGetCurrent(void) {
 120     SecurityClient *client = SecSecurityClientGet();
 121     assert(client && client->accessGroups);
 122     return client->accessGroups;
 123 }
 124
 125 // Only for testing.
 126 void SecAccessGroupsSetCurrent(CFArrayRef accessGroups);
 127 void SecAccessGroupsSetCurrent(CFArrayRef accessGroups) {
 128     // Not thread safe at all, but OK because it is meant to be used only by tests.
 129     gClient.accessGroups = accessGroups;
 130 }
 131
 132 #if !TARGET_OS_IPHONE
 133 static bool securityd_in_system_context(void) {
 134     static bool runningInSystemContext;
 135     static dispatch_once_t onceToken;
 136     dispatch_once(&onceToken, ^{
 137         runningInSystemContext = (getuid() == 0);
 138         if (!runningInSystemContext) {
 139             char *manager;
 140             if (vproc_swap_string(NULL, VPROC_GSK_MGR_NAME, NULL, &manager) == NULL) {
 141                 runningInSystemContext = (!strcmp(manager, VPROCMGR_SESSION_SYSTEM) ||
 142                                           !strcmp(manager, VPROCMGR_SESSION_LOGINWINDOW));
 143                 free(manager);
 144             }
 145         }
 146     });
 147     return runningInSystemContext;
 148 }
 149 #endif
 150
 151 static const char *securityd_service_name(void) {
 152         return kSecuritydXPCServiceName;
 153 }
 154
 155 static uid_t target_uid = -1;
 156
 157 void
 158 _SecSetSecuritydTargetUID(uid_t uid)
 159 {
 160     target_uid = uid;
 161 }
 162
 163
 164 static xpc_connection_t securityd_create_connection(const char *name, uint64_t flags) {
 165     const char *serviceName = name;
 166     if (!serviceName) {
 167         serviceName = securityd_service_name();
 168     }
 169     xpc_connection_t connection;
 170     connection = xpc_connection_create_mach_service(serviceName, NULL, flags);
 171     xpc_connection_set_event_handler(connection, ^(xpc_object_t event) {
 172         const char *description = xpc_dictionary_get_string(event, XPC_ERROR_KEY_DESCRIPTION);
 173         secnotice("xpc", "got event: %s", description);
 174     });
 175     if (target_uid != (uid_t)-1) {
 176         xpc_connection_set_target_uid(connection, target_uid);
 177     }
 178     xpc_connection_resume(connection);
 179     return connection;
 180 }
 181
 182 static xpc_connection_t sSecuritydConnection;
 183 static xpc_connection_t sTrustdConnection;
 184
 185 static xpc_connection_t securityd_connection(void) {
 186     static dispatch_once_t once;
 187     dispatch_once(&once, ^{
 188         sSecuritydConnection = securityd_create_connection(kSecuritydXPCServiceName, 0);
 189     });
 190     return sSecuritydConnection;
 191 }
 192
 193 static xpc_connection_t trustd_connection(void) {
 194 #if (TARGET_OS_MAC && !(TARGET_OS_EMBEDDED || TARGET_OS_IPHONE || TARGET_IPHONE_SIMULATOR))
 195         static dispatch_once_t once;
 196         dispatch_once(&once, ^{
 197         bool sysCtx = securityd_in_system_context();
 198         uint64_t flags = (sysCtx) ? XPC_CONNECTION_MACH_SERVICE_PRIVILEGED : 0;
 199         const char *serviceName = (sysCtx) ? kTrustdXPCServiceName : kTrustdAgentXPCServiceName;
 200                 sTrustdConnection = securityd_create_connection(serviceName, flags);
 201         });
 202         return sTrustdConnection;
 203 #else
 204     static dispatch_once_t once;
 205     dispatch_once(&once, ^{
 206         sTrustdConnection = securityd_create_connection(kTrustdXPCServiceName, 0);
 207     });
 208     return sTrustdConnection;
 209 #endif
 210 }
 211
 212 static bool is_trust_operation(enum SecXPCOperation op) {
 213     switch (op) {
 214         case sec_trust_store_contains_id:
 215         case sec_trust_store_set_trust_settings_id:
 216         case sec_trust_store_remove_certificate_id:
 217         case sec_trust_evaluate_id:
 218         case sec_trust_store_copy_all_id:
 219         case sec_trust_store_copy_usage_constraints_id:
 220         case sec_ocsp_cache_flush_id:
 221         case sec_ota_pki_trust_store_version_id:
 222         case kSecXPCOpOTAGetEscrowCertificates:
 223         case kSecXPCOpOTAPKIGetNewAsset:
 224         case kSecXPCOpTLSAnaltyicsReport:
 225             return true;
 226         default:
 227             break;
 228     }
 229     return false;
 230 }
 231
 232 static xpc_connection_t securityd_connection_for_operation(enum SecXPCOperation op) {
 233         bool isTrustOp = is_trust_operation(op);
 234         #if SECTRUST_VERBOSE_DEBUG
 235     {
 236         bool sysCtx = securityd_in_system_context();
 237         const char *serviceName = (sysCtx) ? kTrustdXPCServiceName : kTrustdAgentXPCServiceName;
 238         syslog(LOG_ERR, "Will connect to: %s (op=%d)",
 239                (isTrustOp) ? serviceName : kSecuritydXPCServiceName, (int)op);
 240     }
 241         #endif
 242         return (isTrustOp) ? trustd_connection() : securityd_connection();
 243 }
 244
 245 // NOTE: This is not thread safe, but this SPI is for testing only.
 246 void SecServerSetMachServiceName(const char *name) {
 247     // Make sure sSecXPCServer.queue exists.
 248     trustd_connection();
 249
 250     xpc_connection_t oldConection = sTrustdConnection;
 251     sTrustdConnection = securityd_create_connection(name, 0);
 252     if (oldConection)
 253         xpc_release(oldConection);
 254 }
 255
 256 XPC_RETURNS_RETAINED
 257 xpc_object_t
 258 securityd_message_with_reply_sync(xpc_object_t message, CFErrorRef *error)
 259 {
 260     xpc_object_t reply = NULL;
 261     uint64_t operation = xpc_dictionary_get_uint64(message, kSecXPCKeyOperation);
 262     xpc_connection_t connection = securityd_connection_for_operation((enum SecXPCOperation)operation);
 263
 264     const int max_tries = 4; // Per <rdar://problem/17829836> N61/12A342: Audio Playback... for why this needs to be at least 3, so we made it 4.
 265
 266     unsigned int tries_left = max_tries;
 267     do {
 268         if (reply) xpc_release(reply);
 269         reply = xpc_connection_send_message_with_reply_sync(connection, message);
 270     } while (reply == XPC_ERROR_CONNECTION_INTERRUPTED && --tries_left > 0);
 271
 272     if (xpc_get_type(reply) == XPC_TYPE_ERROR) {
 273         CFIndex code =  0;
 274         if (reply == XPC_ERROR_CONNECTION_INTERRUPTED || reply == XPC_ERROR_CONNECTION_INVALID) {
 275             code = kSecXPCErrorConnectionFailed;
 276             seccritical("Failed to talk to %s after %d attempts.",
 277                 (is_trust_operation((enum SecXPCOperation)operation)) ? "trustd" :
 278 #if TARGET_OS_IPHONE
 279                         "securityd",
 280 #else
 281                         "secd",
 282 #endif
 283                 max_tries);
 284         } else if (reply == XPC_ERROR_TERMINATION_IMMINENT)
 285             code = kSecXPCErrorUnknown;
 286         else
 287             code = kSecXPCErrorUnknown;
 288
 289         char *conn_desc = xpc_copy_description(connection);
 290         const char *description = xpc_dictionary_get_string(reply, XPC_ERROR_KEY_DESCRIPTION);
 291         SecCFCreateErrorWithFormat(code, sSecXPCErrorDomain, NULL, error, NULL, CFSTR("%s: %s"), conn_desc, description);
 292         free(conn_desc);
 293         xpc_release(reply);
 294         reply = NULL;
 295     }
 296
 297     return reply;
 298 }
 299
 300 XPC_RETURNS_RETAINED
 301 xpc_object_t
 302 securityd_create_message(enum SecXPCOperation op, CFErrorRef* error)
 303 {
 304     xpc_object_t message = xpc_dictionary_create(NULL, NULL, 0);
 305     if (message) {
 306         xpc_dictionary_set_uint64(message, kSecXPCKeyOperation, op);
 307     } else {
 308         SecCFCreateError(kSecXPCErrorConnectionFailed, sSecXPCErrorDomain,
 309                          CFSTR("xpc_dictionary_create returned NULL"), NULL, error);
 310     }
 311     return message;
 312 }
 313
 314 // Return true if there is no error in message, return false and set *error if there is.
 315 bool securityd_message_no_error(xpc_object_t message, CFErrorRef *error) {
 316     xpc_object_t xpc_error = NULL;
 317     if (message == NULL)
 318         return false;
 319
 320     xpc_error = xpc_dictionary_get_value(message, kSecXPCKeyError);
 321     if (xpc_error == NULL)
 322         return true;
 323
 324     CFErrorRef localError = SecCreateCFErrorWithXPCObject(xpc_error);
 325
 326 #if TARGET_OS_IPHONE
 327     secdebug("xpc", "Talking to securityd failed with error: %@", localError);
 328 #else
 329 #if !defined(NDEBUG)
 330     uint64_t operation = xpc_dictionary_get_uint64(message, kSecXPCKeyOperation);
 331 #endif
 332     secdebug("xpc", "Talking to %s failed with error: %@",
 333              (is_trust_operation((enum SecXPCOperation)operation)) ? "trustd" : "secd", localError);
 334 #endif
 335
 336     if (error) {
 337         *error = localError;
 338     } else {
 339         CFReleaseSafe(localError);
 340     }
 341     return false;
 342 }
 343
 344 bool securityd_send_sync_and_do(enum SecXPCOperation op, CFErrorRef *error,
 345                                 bool (^add_to_message)(xpc_object_t message, CFErrorRef* error),
 346                                 bool (^handle_response)(xpc_object_t _Nonnull response, CFErrorRef* error)) {
 347     xpc_object_t message = securityd_create_message(op, error);
 348     bool ok = false;
 349     if (message) {
 350         if (!add_to_message || add_to_message(message, error)) {
 351             xpc_object_t response = securityd_message_with_reply_sync(message, error);
 352             if (response) {
 353                 if (securityd_message_no_error(response, error)) {
 354                     ok = (!handle_response || handle_response(response, error));
 355                 }
 356                 xpc_release(response);
 357             }
 358         }
 359         xpc_release(message);
 360     }
 361
 362     return ok;
 363 }
 364
 365
 366 CFDictionaryRef
 367 _SecSecuritydCopyWhoAmI(CFErrorRef *error)
 368 {
 369     CFDictionaryRef reply = NULL;
 370     xpc_object_t message = securityd_create_message(kSecXPCOpWhoAmI, error);
 371     if (message) {
 372         xpc_object_t response = securityd_message_with_reply_sync(message, error);
 373         if (response) {
 374             reply = _CFXPCCreateCFObjectFromXPCObject(response);
 375             xpc_release(response);
 376         } else {
 377             secerror("Securityd failed getting whoamid with error: %@",
 378                      error ? *error : NULL);
 379         }
 380         xpc_release(message);
 381     }
 382     return reply;
 383 }
 384
 385 bool
 386 _SecSyncBubbleTransfer(CFArrayRef services, uid_t uid, CFErrorRef *error)
 387 {
 388     xpc_object_t message;
 389     bool reply = false;
 390
 391     message = securityd_create_message(kSecXPCOpTransmogrifyToSyncBubble, error);
 392     if (message) {
 393         xpc_dictionary_set_int64(message, "uid", uid);
 394         if (SecXPCDictionarySetPList(message, "services", services, error)) {
 395             xpc_object_t response = securityd_message_with_reply_sync(message, error);
 396             if (response) {
 397                 reply = xpc_dictionary_get_bool(response, kSecXPCKeyResult);
 398                 if (!reply)
 399                     securityd_message_no_error(response, error);
 400                 xpc_release(response);
 401             }
 402             xpc_release(message);
 403         }
 404     }
 405     return reply;
 406 }
 407
 408 bool
 409 _SecSystemKeychainTransfer(CFErrorRef *error)
 410 {
 411     xpc_object_t message;
 412     bool reply = false;
 413
 414     message = securityd_create_message(kSecXPCOpTransmogrifyToSystemKeychain, error);
 415     if (message) {
 416         xpc_object_t response = securityd_message_with_reply_sync(message, error);
 417         if (response) {
 418             reply = xpc_dictionary_get_bool(response, kSecXPCKeyResult);
 419             if (!reply)
 420                 securityd_message_no_error(response, error);
 421             xpc_release(response);
 422         }
 423         xpc_release(message);
 424     }
 425     return reply;
 426 }
 427
 428 bool
 429 _SecSyncDeleteUserViews(uid_t uid, CFErrorRef *error)
 430 {
 431     xpc_object_t message;
 432     bool reply = false;
 433
 434     message = securityd_create_message(kSecXPCOpDeleteUserView, error);
 435     if (message) {
 436         xpc_dictionary_set_int64(message, "uid", uid);
 437
 438         xpc_object_t response = securityd_message_with_reply_sync(message, error);
 439         if (response) {
 440             reply = xpc_dictionary_get_bool(response, kSecXPCKeyResult);
 441             if (!reply)
 442                 securityd_message_no_error(response, error);
 443             xpc_release(response);
 444         }
 445         xpc_release(message);
 446     }
 447     return reply;
 448 }
 449
 450 XPC_RETURNS_RETAINED xpc_endpoint_t
 451 _SecSecuritydCopyEndpoint(enum SecXPCOperation op, CFErrorRef *error)
 452 {
 453     xpc_endpoint_t endpoint = NULL;
 454     xpc_object_t message = securityd_create_message(op, error);
 455     if (message) {
 456         xpc_object_t response = securityd_message_with_reply_sync(message, error);
 457         if (response) {
 458             endpoint = xpc_dictionary_get_value(response, kSecXPCKeyEndpoint);
 459             if (endpoint) {
 460                 if(xpc_get_type(endpoint) != XPC_TYPE_ENDPOINT) {
 461                     secerror("endpoint was not an endpoint");
 462                     endpoint = NULL;
 463                 } else {
 464                     xpc_retain(endpoint);
 465                 }
 466             } else {
 467                 secerror("endpoint was null");
 468             }
 469             xpc_release(response);
 470         } else {
 471             secerror("Securityd failed getting endpoint with error: %@", error ? *error : NULL);
 472         }
 473         xpc_release(message);
 474     }
 475     return endpoint;
 476 }
 477
 478
 479 XPC_RETURNS_RETAINED xpc_endpoint_t
 480 _SecSecuritydCopyCKKSEndpoint(CFErrorRef *error)
 481 {
 482     return NULL;
 483 }
 484
 485 XPC_RETURNS_RETAINED xpc_endpoint_t
 486 _SecSecuritydCopyKeychainControlEndpoint(CFErrorRef* error)
 487 {
 488     return _SecSecuritydCopyEndpoint(kSecXPCOpKeychainControlEndpoint, error);
 489 }