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 #include "server_security_helpers.h"
  62
  63 struct securityd *gSecurityd;
  64 struct trustd *gTrustd;
  65
  66 //
  67 // MARK: XPC IPC.
  68 //
  69
  70 /* Hardcoded Access Groups for the server itself */
  71 static CFArrayRef SecServerCopyAccessGroups(void) {
  72     return CFArrayCreateForCFTypes(kCFAllocatorDefault,
  73 #if NO_SERVER
  74                                    CFSTR("test"),
  75                                    CFSTR("apple"),
  76                                    CFSTR("lockdown-identities"),
  77                                    CFSTR("123456.test.group"),
  78                                    CFSTR("123456.test.group2"),
  79                                    CFSTR("com.apple.cfnetwork"),
  80 #else
  81                                    CFSTR("sync"),
  82 #endif
  83                                    CFSTR("com.apple.security.sos"),
  84                                    CFSTR("com.apple.security.ckks"),
  85                                    CFSTR("com.apple.security.sos-usercredential"),
  86                                    CFSTR("com.apple.sbd"),
  87                                    CFSTR("com.apple.lakitu"),
  88                                    CFSTR("com.apple.security.securityd"),
  89                                    kSecAttrAccessGroupToken,
  90                                    NULL);
  91 }
  92
  93 static SecurityClient gClient;
  94
  95 #if TARGET_OS_IOS
  96 void
  97 SecSecuritySetMusrMode(bool mode, uid_t uid, int activeUser)
  98 {
  99     gClient.inMultiUser = mode;
 100     gClient.uid = uid;
 101     gClient.activeUser = activeUser;
 102 }
 103 #endif
 104
 105 SecurityClient *
 106 SecSecurityClientGet(void)
 107 {
 108     static dispatch_once_t onceToken;
 109     dispatch_once(&onceToken, ^{
 110         gClient.task = NULL;
 111         gClient.accessGroups = SecServerCopyAccessGroups();
 112         gClient.allowSystemKeychain = true;
 113         gClient.allowSyncBubbleKeychain = true;
 114         gClient.isNetworkExtension = false;
 115 #if TARGET_OS_IPHONE
 116         gClient.inMultiUser = false;
 117         gClient.activeUser = 501;
 118 #endif
 119     });
 120     return &gClient;
 121 }
 122
 123 CFArrayRef SecAccessGroupsGetCurrent(void) {
 124     SecurityClient *client = SecSecurityClientGet();
 125     assert(client && client->accessGroups);
 126     return client->accessGroups;
 127 }
 128
 129 // Only for testing.
 130 void SecAccessGroupsSetCurrent(CFArrayRef accessGroups) {
 131     // Not thread safe at all, but OK because it is meant to be used only by tests.
 132     gClient.accessGroups = accessGroups;
 133 }
 134
 135 #if !TARGET_OS_IPHONE
 136 static bool securityd_in_system_context(void) {
 137     static bool runningInSystemContext;
 138     static dispatch_once_t onceToken;
 139     dispatch_once(&onceToken, ^{
 140         runningInSystemContext = (getuid() == 0);
 141         if (!runningInSystemContext) {
 142             char *manager;
 143             if (vproc_swap_string(NULL, VPROC_GSK_MGR_NAME, NULL, &manager) == NULL) {
 144                 runningInSystemContext = (!strcmp(manager, VPROCMGR_SESSION_SYSTEM) ||
 145                                           !strcmp(manager, VPROCMGR_SESSION_LOGINWINDOW));
 146                 free(manager);
 147             }
 148         }
 149     });
 150     return runningInSystemContext;
 151 }
 152 #endif
 153
 154 static const char *securityd_service_name(void) {
 155         return kSecuritydXPCServiceName;
 156 }
 157
 158 #define SECURITY_TARGET_UID_UNSET   ((uid_t)-1)
 159 static uid_t securityd_target_uid = SECURITY_TARGET_UID_UNSET;
 160
 161 void
 162 _SecSetSecuritydTargetUID(uid_t uid)
 163 {
 164     securityd_target_uid = uid;
 165 }
 166
 167
 168 static xpc_connection_t securityd_create_connection(const char *name, uid_t target_uid, uint64_t flags) {
 169     const char *serviceName = name;
 170     if (!serviceName) {
 171         serviceName = securityd_service_name();
 172     }
 173     xpc_connection_t connection;
 174     connection = xpc_connection_create_mach_service(serviceName, NULL, flags);
 175     xpc_connection_set_event_handler(connection, ^(xpc_object_t event) {
 176         const char *description = xpc_dictionary_get_string(event, XPC_ERROR_KEY_DESCRIPTION);
 177         secnotice("xpc", "got event: %s", description);
 178     });
 179     if (target_uid != SECURITY_TARGET_UID_UNSET) {
 180         xpc_connection_set_target_uid(connection, target_uid);
 181     }
 182     xpc_connection_resume(connection);
 183     return connection;
 184 }
 185
 186 static xpc_connection_t sSecuritydConnection;
 187 static xpc_connection_t sTrustdConnection;
 188
 189 static xpc_connection_t securityd_connection(void) {
 190     static dispatch_once_t once;
 191     dispatch_once(&once, ^{
 192         sSecuritydConnection = securityd_create_connection(kSecuritydXPCServiceName, securityd_target_uid, 0);
 193     });
 194     return sSecuritydConnection;
 195 }
 196
 197 static xpc_connection_t trustd_connection(void) {
 198 #if (TARGET_OS_MAC && !(TARGET_OS_EMBEDDED || TARGET_OS_IPHONE || TARGET_IPHONE_SIMULATOR))
 199         static dispatch_once_t once;
 200         dispatch_once(&once, ^{
 201         bool sysCtx = securityd_in_system_context();
 202         uint64_t flags = (sysCtx) ? XPC_CONNECTION_MACH_SERVICE_PRIVILEGED : 0;
 203         const char *serviceName = (sysCtx) ? kTrustdXPCServiceName : kTrustdAgentXPCServiceName;
 204                 sTrustdConnection = securityd_create_connection(serviceName, SECURITY_TARGET_UID_UNSET, flags);
 205         });
 206         return sTrustdConnection;
 207 #else
 208     static dispatch_once_t once;
 209     dispatch_once(&once, ^{
 210         sTrustdConnection = securityd_create_connection(kTrustdXPCServiceName, SECURITY_TARGET_UID_UNSET, 0);
 211     });
 212     return sTrustdConnection;
 213 #endif
 214 }
 215
 216 static bool is_trust_operation(enum SecXPCOperation op) {
 217     switch (op) {
 218         case sec_trust_store_contains_id:
 219         case sec_trust_store_set_trust_settings_id:
 220         case sec_trust_store_remove_certificate_id:
 221         case sec_trust_evaluate_id:
 222         case sec_trust_store_copy_all_id:
 223         case sec_trust_store_copy_usage_constraints_id:
 224         case sec_ocsp_cache_flush_id:
 225         case sec_ota_pki_trust_store_version_id:
 226         case kSecXPCOpOTAGetEscrowCertificates:
 227         case kSecXPCOpOTAPKIGetNewAsset:
 228         case kSecXPCOpTLSAnaltyicsReport:
 229             return true;
 230         default:
 231             break;
 232     }
 233     return false;
 234 }
 235
 236 static xpc_connection_t securityd_connection_for_operation(enum SecXPCOperation op) {
 237         bool isTrustOp = is_trust_operation(op);
 238         #if SECTRUST_VERBOSE_DEBUG
 239     {
 240         bool sysCtx = securityd_in_system_context();
 241         const char *serviceName = (sysCtx) ? kTrustdXPCServiceName : kTrustdAgentXPCServiceName;
 242         syslog(LOG_ERR, "Will connect to: %s (op=%d)",
 243                (isTrustOp) ? serviceName : kSecuritydXPCServiceName, (int)op);
 244     }
 245         #endif
 246         return (isTrustOp) ? trustd_connection() : securityd_connection();
 247 }
 248
 249 // NOTE: This is not thread safe, but this SPI is for testing only.
 250 void SecServerSetTrustdMachServiceName(const char *name) {
 251     // Make sure sSecXPCServer.queue exists.
 252     trustd_connection();
 253
 254     xpc_connection_t oldConection = sTrustdConnection;
 255     sTrustdConnection = securityd_create_connection(name, SECURITY_TARGET_UID_UNSET, 0);
 256     if (oldConection)
 257         xpc_release(oldConection);
 258 }
 259
 260
 261 #define SECURITYD_MAX_XPC_TRIES 4
 262 // Per <rdar://problem/17829836> N61/12A342: Audio Playback... for why this needs to be at least 3, so we made it 4.
 263
 264 static bool
 265 _securityd_process_message_reply(xpc_object_t *reply,
 266                                                                  CFErrorRef *error,
 267                                                                  xpc_connection_t connection,
 268                                                                  uint64_t operation)
 269 {
 270         if (xpc_get_type(*reply) != XPC_TYPE_ERROR) {
 271                 return true;
 272         }
 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                                         SECURITYD_MAX_XPC_TRIES);
 284         } else if (*reply == XPC_ERROR_TERMINATION_IMMINENT) {
 285                 code = kSecXPCErrorUnknown;
 286         } else {
 287                 code = kSecXPCErrorUnknown;
 288         }
 289
 290         char *conn_desc = xpc_copy_description(connection);
 291         const char *description = xpc_dictionary_get_string(*reply, XPC_ERROR_KEY_DESCRIPTION);
 292         SecCFCreateErrorWithFormat(code, sSecXPCErrorDomain, NULL, error, NULL, CFSTR("%s: %s"), conn_desc, description);
 293         free(conn_desc);
 294         xpc_release(*reply);
 295         *reply = NULL;
 296         return false;
 297 }
 298
 299
 300 XPC_RETURNS_RETAINED
 301 xpc_object_t
 302 securityd_message_with_reply_sync(xpc_object_t message, CFErrorRef *error)
 303 {
 304     xpc_object_t reply = NULL;
 305     uint64_t operation = xpc_dictionary_get_uint64(message, kSecXPCKeyOperation);
 306     xpc_connection_t connection = securityd_connection_for_operation((enum SecXPCOperation)operation);
 307
 308     const int max_tries = SECURITYD_MAX_XPC_TRIES;
 309
 310     unsigned int tries_left = max_tries;
 311     do {
 312         if (reply) xpc_release(reply);
 313         reply = xpc_connection_send_message_with_reply_sync(connection, message);
 314     } while (reply == XPC_ERROR_CONNECTION_INTERRUPTED && --tries_left > 0);
 315
 316         _securityd_process_message_reply(&reply, error, connection, operation);
 317
 318     return reply;
 319 }
 320
 321 static void
 322 _securityd_message_with_reply_async_inner(xpc_object_t message,
 323                                                                                   dispatch_queue_t replyq,
 324                                                                                   securityd_handler_t handler,
 325                                                                                   uint32_t tries_left)
 326 {
 327         uint64_t operation = xpc_dictionary_get_uint64(message, kSecXPCKeyOperation);
 328         xpc_connection_t connection = securityd_connection_for_operation((enum SecXPCOperation)operation);
 329
 330         xpc_retain(message);
 331         dispatch_retain(replyq);
 332         securityd_handler_t handlerCopy = Block_copy(handler);
 333         xpc_connection_send_message_with_reply(connection, message, replyq, ^(xpc_object_t _Nonnull reply) {
 334                 if (reply == XPC_ERROR_CONNECTION_INTERRUPTED && tries_left > 0) {
 335                         _securityd_message_with_reply_async_inner(message, replyq, handlerCopy, tries_left - 1);
 336                 } else {
 337                         CFErrorRef error = NULL;
 338                         _securityd_process_message_reply(&reply, &error, connection, operation);
 339                         handlerCopy(reply, error);
 340                         CFReleaseNull(error);
 341                 }
 342                 xpc_release(message);
 343                 dispatch_release(replyq);
 344                 Block_release(handlerCopy);
 345         });
 346 }
 347
 348 void
 349 securityd_message_with_reply_async(xpc_object_t message,
 350                                                                    dispatch_queue_t replyq,
 351                                                                    securityd_handler_t handler)
 352 {
 353         _securityd_message_with_reply_async_inner(message, replyq, handler, SECURITYD_MAX_XPC_TRIES);
 354 }
 355
 356 XPC_RETURNS_RETAINED
 357 xpc_object_t
 358 securityd_create_message(enum SecXPCOperation op, CFErrorRef* error)
 359 {
 360     xpc_object_t message = xpc_dictionary_create(NULL, NULL, 0);
 361     if (message) {
 362         xpc_dictionary_set_uint64(message, kSecXPCKeyOperation, op);
 363     } else {
 364         SecCFCreateError(kSecXPCErrorConnectionFailed, sSecXPCErrorDomain,
 365                          CFSTR("xpc_dictionary_create returned NULL"), NULL, error);
 366     }
 367     return message;
 368 }
 369
 370 // Return true if there is no error in message, return false and set *error if there is.
 371 bool securityd_message_no_error(xpc_object_t message, CFErrorRef *error) {
 372     xpc_object_t xpc_error = NULL;
 373     if (message == NULL)
 374         return false;
 375
 376     xpc_error = xpc_dictionary_get_value(message, kSecXPCKeyError);
 377     if (xpc_error == NULL)
 378         return true;
 379
 380     CFErrorRef localError = SecCreateCFErrorWithXPCObject(xpc_error);
 381
 382 #if TARGET_OS_IPHONE
 383     secdebug("xpc", "Talking to securityd failed with error: %@", localError);
 384 #else
 385 #if !defined(NDEBUG)
 386     uint64_t operation = xpc_dictionary_get_uint64(message, kSecXPCKeyOperation);
 387 #endif
 388     secdebug("xpc", "Talking to %s failed with error: %@",
 389              (is_trust_operation((enum SecXPCOperation)operation)) ? "trustd" : "secd", localError);
 390 #endif
 391
 392     if (error) {
 393         *error = localError;
 394     } else {
 395         CFReleaseSafe(localError);
 396     }
 397     return false;
 398 }
 399
 400 bool securityd_send_sync_and_do(enum SecXPCOperation op, CFErrorRef *error,
 401                                 bool (^add_to_message)(xpc_object_t message, CFErrorRef* error),
 402                                 bool (^handle_response)(xpc_object_t _Nonnull response, CFErrorRef* error)) {
 403     xpc_object_t message = securityd_create_message(op, error);
 404     bool ok = false;
 405     if (message) {
 406         if (!add_to_message || add_to_message(message, error)) {
 407             xpc_object_t response = securityd_message_with_reply_sync(message, error);
 408             if (response) {
 409                 if (securityd_message_no_error(response, error)) {
 410                     ok = (!handle_response || handle_response(response, error));
 411                 }
 412                 xpc_release(response);
 413             }
 414         }
 415         xpc_release(message);
 416     }
 417
 418     return ok;
 419 }
 420
 421 void securityd_send_async_and_do(enum SecXPCOperation op, dispatch_queue_t replyq,
 422                                                                  bool (^add_to_message)(xpc_object_t message, CFErrorRef* error),
 423                                                                  securityd_handler_t handler) {
 424         CFErrorRef error = NULL;
 425         xpc_object_t message = securityd_create_message(op, &error);
 426         if (message == NULL) {
 427                 handler(NULL, error);
 428                 CFReleaseNull(error);
 429                 return;
 430         }
 431
 432         if (add_to_message != NULL) {
 433                 if (!add_to_message(message, &error)) {
 434                         handler(NULL, error);
 435                         xpc_release(message);
 436                         CFReleaseNull(error);
 437                         return;
 438                 }
 439         }
 440
 441         securityd_message_with_reply_async(message, replyq, ^(xpc_object_t reply, CFErrorRef error2) {
 442                 if (error2 != NULL) {
 443                         handler(NULL, error2);
 444                         return;
 445                 }
 446                 CFErrorRef error3 = NULL;
 447                 if (!securityd_message_no_error(reply, &error3)) {
 448                         handler(NULL, error3);
 449                         CFReleaseNull(error3);
 450                         return;
 451                 }
 452                 handler(reply, NULL);
 453         });
 454         xpc_release(message);
 455 }
 456
 457
 458 CFDictionaryRef
 459 _SecSecuritydCopyWhoAmI(CFErrorRef *error)
 460 {
 461     CFDictionaryRef reply = NULL;
 462     xpc_object_t message = securityd_create_message(kSecXPCOpWhoAmI, error);
 463     if (message) {
 464         xpc_object_t response = securityd_message_with_reply_sync(message, error);
 465         if (response) {
 466             reply = _CFXPCCreateCFObjectFromXPCObject(response);
 467             xpc_release(response);
 468         } else {
 469             secerror("Securityd failed getting whoamid with error: %@",
 470                      error ? *error : NULL);
 471         }
 472         xpc_release(message);
 473     }
 474     return reply;
 475 }
 476
 477 bool
 478 _SecSyncBubbleTransfer(CFArrayRef services, uid_t uid, CFErrorRef *error)
 479 {
 480     xpc_object_t message;
 481     bool reply = false;
 482
 483     message = securityd_create_message(kSecXPCOpTransmogrifyToSyncBubble, error);
 484     if (message) {
 485         xpc_dictionary_set_int64(message, "uid", uid);
 486         if (SecXPCDictionarySetPList(message, "services", services, error)) {
 487             xpc_object_t response = securityd_message_with_reply_sync(message, error);
 488             if (response) {
 489                 reply = xpc_dictionary_get_bool(response, kSecXPCKeyResult);
 490                 if (!reply)
 491                     securityd_message_no_error(response, error);
 492                 xpc_release(response);
 493             }
 494             xpc_release(message);
 495         }
 496     }
 497     return reply;
 498 }
 499
 500 bool
 501 _SecSystemKeychainTransfer(CFErrorRef *error)
 502 {
 503     xpc_object_t message;
 504     bool reply = false;
 505
 506     message = securityd_create_message(kSecXPCOpTransmogrifyToSystemKeychain, error);
 507     if (message) {
 508         xpc_object_t response = securityd_message_with_reply_sync(message, error);
 509         if (response) {
 510             reply = xpc_dictionary_get_bool(response, kSecXPCKeyResult);
 511             if (!reply)
 512                 securityd_message_no_error(response, error);
 513             xpc_release(response);
 514         }
 515         xpc_release(message);
 516     }
 517     return reply;
 518 }
 519
 520 bool
 521 _SecSyncDeleteUserViews(uid_t uid, CFErrorRef *error)
 522 {
 523     xpc_object_t message;
 524     bool reply = false;
 525
 526     message = securityd_create_message(kSecXPCOpDeleteUserView, error);
 527     if (message) {
 528         xpc_dictionary_set_int64(message, "uid", uid);
 529
 530         xpc_object_t response = securityd_message_with_reply_sync(message, error);
 531         if (response) {
 532             reply = xpc_dictionary_get_bool(response, kSecXPCKeyResult);
 533             if (!reply)
 534                 securityd_message_no_error(response, error);
 535             xpc_release(response);
 536         }
 537         xpc_release(message);
 538     }
 539     return reply;
 540 }
 541
 542 XPC_RETURNS_RETAINED xpc_endpoint_t
 543 _SecSecuritydCopyEndpoint(enum SecXPCOperation op, CFErrorRef *error)
 544 {
 545     xpc_endpoint_t endpoint = NULL;
 546     xpc_object_t message = securityd_create_message(op, error);
 547     if (message) {
 548         xpc_object_t response = securityd_message_with_reply_sync(message, error);
 549         if (response) {
 550             endpoint = xpc_dictionary_get_value(response, kSecXPCKeyEndpoint);
 551             if (endpoint) {
 552                 if(xpc_get_type(endpoint) != XPC_TYPE_ENDPOINT) {
 553                     secerror("endpoint was not an endpoint");
 554                     endpoint = NULL;
 555                 } else {
 556                     xpc_retain(endpoint);
 557                 }
 558             } else {
 559                 secerror("endpoint was null");
 560             }
 561             xpc_release(response);
 562         } else {
 563             secerror("Securityd failed getting endpoint with error: %@", error ? *error : NULL);
 564         }
 565         xpc_release(message);
 566     }
 567     return endpoint;
 568 }
 569
 570
 571 XPC_RETURNS_RETAINED xpc_endpoint_t
 572 _SecSecuritydCopyCKKSEndpoint(CFErrorRef *error)
 573 {
 574     return NULL;
 575 }
 576
 577 XPC_RETURNS_RETAINED xpc_endpoint_t
 578 _SecSecuritydCopyKeychainControlEndpoint(CFErrorRef* error)
 579 {
 580     return _SecSecuritydCopyEndpoint(kSecXPCOpKeychainControlEndpoint, error);
 581 }
 582
 583 XPC_RETURNS_RETAINED xpc_endpoint_t
 584 _SecSecuritydCopySFKeychainEndpoint(CFErrorRef* error)
 585 {
 586     return _SecSecuritydCopyEndpoint(kSecXPCOpSFKeychainEndpoint, error);
 587 }