OSX/sec/SharedWebCredential/swcagent.m

   1 /*
   2  * Copyright (c) 2014-2016 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 #include <mach/mach.h>
  25 #include <mach/message.h>
  26
  27 #include <stdlib.h>
  28 #include <sys/queue.h>
  29 #include <libproc.h>
  30
  31 #include <Security/SecInternal.h>
  32 #include <Security/SecBasePriv.h>
  33 #include <Security/SecItemPriv.h> /* for SecErrorGetOSStatus */
  34 #include <CoreFoundation/CoreFoundation.h>
  35 #include <CoreFoundation/CFPriv.h>
  36
  37 #include <Foundation/Foundation.h>
  38
  39 #if TARGET_OS_IPHONE
  40 #include <CoreFoundation/CFUserNotification.h>
  41 #endif
  42 #if !TARGET_OS_IPHONE
  43 #include <CoreFoundation/CFUserNotificationPriv.h>
  44 #endif
  45
  46 #if TARGET_OS_IPHONE
  47 #include <SpringBoardServices/SpringBoardServices.h>
  48 #include <MobileCoreServices/LSApplicationProxy.h>
  49 #endif
  50
  51 #if TARGET_OS_IPHONE && !TARGET_OS_NANO
  52 #include <dlfcn.h>
  53 #include <WebUI/WBUAutoFillData.h>
  54
  55 typedef WBSAutoFillDataClasses (*WBUAutoFillGetEnabledDataClasses_f)(void);
  56 #endif
  57
  58 #include <asl.h>
  59 #include <syslog.h>
  60 #include <bsm/libbsm.h>
  61 #include <utilities/SecIOFormat.h>
  62 #include <utilities/debugging.h>
  63
  64 #include <ipc/securityd_client.h>
  65 #include "swcagent_client.h"
  66
  67 #include <securityd/SecItemServer.h>
  68 #include <securityd/SecTrustServer.h>
  69 #include <securityd/SecTrustStoreServer.h>
  70 #include <securityd/spi.h>
  71 #include <Security/SecTask.h>
  72
  73 #include <utilities/SecCFWrappers.h>
  74 #include <utilities/SecCFError.h>
  75 #include <utilities/SecXPCError.h>
  76
  77 // TODO: Make this include work on both platforms.
  78 #if TARGET_OS_EMBEDDED
  79 #include <Security/SecEntitlements.h>
  80 #else
  81 /* defines from <Security/SecEntitlements.h> */
  82 #define kSecEntitlementAssociatedDomains CFSTR("com.apple.developer.associated-domains")
  83 #define kSecEntitlementPrivateAssociatedDomains CFSTR("com.apple.private.associated-domains")
  84 #endif
  85
  86 #include <Security/SecuritydXPC.h>
  87
  88 #include <xpc/xpc.h>
  89 #include <xpc/private.h>
  90 #include <xpc/connection_private.h>
  91 #include <AssertMacros.h>
  92
  93 #if TARGET_IPHONE_SIMULATOR
  94 #define CHECK_ENTITLEMENTS 0
  95 #else
  96 #define CHECK_ENTITLEMENTS 0 /* %%% TODO: re-enable when entitlements are available */
  97 #endif
  98
  99 #if CHECK_ENTITLEMENTS
 100 static bool SecTaskGetBooleanValueForEntitlement(SecTaskRef task, CFStringRef entitlement)
 101 {
 102     CFStringRef canModify = (CFStringRef)SecTaskCopyValueForEntitlement(task, entitlement, NULL);
 103     if (!canModify)
 104         return false;
 105     CFTypeID canModifyType = CFGetTypeID(canModify);
 106     bool ok = (CFBooleanGetTypeID() == canModifyType) && CFBooleanGetValue((CFBooleanRef)canModify);
 107     CFRelease(canModify);
 108     return ok;
 109 }
 110
 111 static CFArrayRef SecTaskCopyArrayOfStringsForEntitlement(SecTaskRef task, CFStringRef entitlement)
 112 {
 113     CFArrayRef value = (CFArrayRef)SecTaskCopyValueForEntitlement(task,
 114         entitlement, NULL);
 115     if (value) {
 116         if (CFGetTypeID(value) == CFArrayGetTypeID()) {
 117             CFIndex ix, count = CFArrayGetCount(value);
 118             for (ix = 0; ix < count; ++ix) {
 119                 CFStringRef string = (CFStringRef)CFArrayGetValueAtIndex(value, ix);
 120                 if (CFGetTypeID(string) != CFStringGetTypeID()) {
 121                     CFRelease(value);
 122                     value = NULL;
 123                     break;
 124                 }
 125             }
 126         } else {
 127             CFRelease(value);
 128             value = NULL;
 129         }
 130     }
 131
 132     return value;
 133 }
 134
 135 #endif /* CHECK_ENTITLEMENTS */
 136
 137
 138 /* Identify a client */
 139 enum {
 140         CLIENT_TYPE_BUNDLE_IDENTIFIER,
 141         CLIENT_TYPE_EXECUTABLE_PATH,
 142 };
 143
 144 @interface Client : NSObject
 145 @property int client_type;
 146 @property(retain) NSString *client;
 147 @property(retain) NSString *client_name;
 148 @property(retain) NSString *path;
 149 @property(retain) NSBundle *bundle;
 150 @end
 151
 152 @implementation Client
 153 @end
 154
 155 static Client *identify_client(pid_t pid)
 156 {
 157         Client *client = [[Client alloc] init];
 158         if (!client)
 159                 return nil;
 160
 161         char path_buf[PROC_PIDPATHINFO_SIZE] = "";
 162         NSURL *path_url;
 163
 164 #if TARGET_OS_IPHONE
 165         if (proc_pidpath(pid, path_buf, sizeof(path_buf)) <= 0) {
 166                 secnotice("swcagent", "Refusing client without path (pid %d)", pid);
 167                 return nil;
 168         }
 169 #else
 170         size_t path_len = sizeof(path_buf);
 171         if (responsibility_get_responsible_for_pid(pid, NULL, NULL, &path_len, path_buf) != 0) {
 172                 asl_log(NULL, NULL, ASL_LEVEL_NOTICE, "Refusing client without path (pid %d)", pid);
 173                 [client release];
 174                 return nil;
 175         }
 176 #endif
 177         path_buf[sizeof(path_buf) - 1] = '\0';
 178
 179         if (!(client.path = [NSString stringWithUTF8String:path_buf]) ||
 180             !(path_url = [NSURL fileURLWithPath:client.path])) {
 181                 secnotice("swcagent", "Refusing client without path (pid %d)", pid);
 182                 return nil;
 183         }
 184
 185         NSURL *bundle_url;
 186         if ((bundle_url = CFBridgingRelease(_CFBundleCopyBundleURLForExecutableURL((__bridge CFURLRef)path_url))) &&
 187             (client.bundle = [NSBundle bundleWithURL:bundle_url]) &&
 188             (client.client = [client.bundle bundleIdentifier])) {
 189                 client.client_type = CLIENT_TYPE_BUNDLE_IDENTIFIER;
 190                 CFStringRef client_name_cf = NULL;
 191 #if TARGET_OS_IPHONE
 192                 client.client_name = [[LSApplicationProxy applicationProxyForIdentifier:client.client] localizedNameForContext:nil];
 193 #else
 194                 if (!LSCopyDisplayNameForURL((__bridge CFURLRef)bundle_url, &client_name_cf))
 195                         client.client_name = (__bridge_transfer NSString *)client_name_cf;
 196 #endif
 197                 if (client_name_cf)
 198                         CFRelease(client_name_cf);
 199         } else {
 200 #if TARGET_OS_IPHONE
 201                 secnotice("swcagent", "Refusing client without bundle identifier (%s)", path_buf);
 202                 return nil;
 203 #else
 204                 client.client_type = CLIENT_TYPE_EXECUTABLE_PATH;
 205                 CFBooleanRef is_app = NULL;
 206                 CFStringRef client_name_cf;
 207                 if (bundle_url &&
 208                     CFURLCopyResourcePropertyForKey((__bridge CFURLRef)bundle_url, kCFURLIsApplicationKey, &is_app, NULL) &&
 209                     is_app == kCFBooleanTrue) {
 210                         if ((client.client = [bundle_url path]) &&
 211                             !LSCopyDisplayNameForURL((__bridge CFURLRef)bundle_url, &client_name_cf))
 212                                 client.client_name = (__bridge_transfer NSString *)client_name_cf;
 213                 } else {
 214                         client.client = client.path;
 215                         if (!LSCopyDisplayNameForURL((__bridge CFURLRef)path_url, &client_name_cf))
 216                                 client.client_name = (__bridge_transfer NSString *)client_name_cf;
 217                 }
 218                 if (is_app)
 219                         CFRelease(is_app);
 220 #endif
 221         }
 222
 223     return client;
 224 }
 225
 226 struct __SecTask {
 227     CFRuntimeBase base;
 228
 229     pid_t pid_self;
 230     audit_token_t token;
 231
 232     /* Track whether we've loaded entitlements independently since after the
 233      * load, entitlements may legitimately be NULL */
 234     Boolean entitlementsLoaded;
 235     CFDictionaryRef entitlements;
 236 };
 237
 238 static Client* SecTaskCopyClient(SecTaskRef task)
 239 {
 240     // SecTaskCopyDebugDescription is not sufficient to get the localized client name
 241     pid_t pid;
 242     if (task->pid_self==-1) {
 243         audit_token_to_au32(task->token, NULL, NULL, NULL, NULL, NULL, &pid, NULL, NULL);
 244     } else {
 245         pid = task->pid_self;
 246     }
 247     Client *client = identify_client(pid);
 248
 249     return client;
 250 }
 251
 252 static CFArrayRef SecTaskCopyAccessGroups(SecTaskRef task) {
 253 #if CHECK_ENTITLEMENTS
 254     CFArrayRef groups = SecTaskCopyArrayOfStringsForEntitlement(task, kSecEntitlementAssociatedDomains);
 255 #else
 256     CFArrayRef groups = SecAccessGroupsGetCurrent();
 257     CFRetainSafe(groups);
 258 #endif
 259     return groups;
 260 }
 261
 262 // Local function declarations
 263
 264 static CFArrayRef gActiveArray = NULL;
 265 static CFDictionaryRef gActiveItem = NULL;
 266
 267
 268 static CFStringRef SWCAGetOperationDescription(enum SWCAXPCOperation op)
 269 {
 270     switch (op) {
 271         case swca_add_request_id:
 272             return CFSTR("swc add");
 273         case swca_update_request_id:
 274             return CFSTR("swc update");
 275         case swca_delete_request_id:
 276             return CFSTR("swc delete");
 277         case swca_copy_request_id:
 278             return CFSTR("swc copy");
 279         case swca_select_request_id:
 280             return CFSTR("swc select");
 281         case swca_copy_pairs_request_id:
 282             return CFSTR("swc copy pairs");
 283         case swca_set_selection_request_id:
 284             return CFSTR("swc set selection");
 285         case swca_enabled_request_id:
 286             return CFSTR("swc enabled");
 287         default:
 288             return CFSTR("Unknown xpc operation");
 289     }
 290 }
 291
 292 #if !TARGET_IPHONE_SIMULATOR && TARGET_OS_IPHONE && !TARGET_OS_NANO
 293 static dispatch_once_t                      sWBUInitializeOnce  = 0;
 294 static void *                               sWBULibrary                 = NULL;
 295 static WBUAutoFillGetEnabledDataClasses_f       sWBUAutoFillGetEnabledDataClasses_f     = NULL;
 296
 297 static OSStatus _SecWBUEnsuredInitialized(void);
 298
 299 static OSStatus _SecWBUEnsuredInitialized(void)
 300 {
 301     __block OSStatus status = errSecNotAvailable;
 302
 303     dispatch_once(&sWBUInitializeOnce, ^{
 304         sWBULibrary = dlopen("/System/Library/PrivateFrameworks/WebUI.framework/WebUI", RTLD_LAZY | RTLD_LOCAL);
 305         assert(sWBULibrary);
 306         if (sWBULibrary) {
 307             sWBUAutoFillGetEnabledDataClasses_f = (WBUAutoFillGetEnabledDataClasses_f)(uintptr_t) dlsym(sWBULibrary, "WBUAutoFillGetEnabledDataClasses");
 308         }
 309     });
 310
 311     if (sWBUAutoFillGetEnabledDataClasses_f) {
 312         status = noErr;
 313     }
 314     return status;
 315 }
 316 #endif
 317
 318 static bool SWCAIsAutofillEnabled(void)
 319 {
 320 #if TARGET_IPHONE_SIMULATOR
 321     // Assume the setting's on in the simulator: <rdar://problem/17057358> WBUAutoFillGetEnabledDataClasses call failing in the Simulator
 322     return true;
 323 #elif TARGET_OS_IPHONE && !TARGET_OS_NANO
 324     OSStatus status = _SecWBUEnsuredInitialized();
 325     if (status) { return false; }
 326     WBSAutoFillDataClasses autofill = sWBUAutoFillGetEnabledDataClasses_f();
 327     return ((autofill & WBSAutoFillDataClassUsernamesAndPasswords) != 0);
 328 #else
 329     //%%% unsupported platform
 330     return false;
 331 #endif
 332 }
 333
 334 static CFOptionFlags swca_handle_request(enum SWCAXPCOperation operation, Client* client, CFArrayRef domains)
 335 {
 336     CFUserNotificationRef notification = NULL;
 337     NSMutableDictionary *notification_dictionary = NULL;
 338     NSString *security_path = @"/System/Library/Frameworks/Security.framework";
 339     NSString *swc_table = @"SharedWebCredentials";
 340     NSBundle *security_bundle;
 341     NSString *request_key;
 342     NSString *request_format;
 343     NSString *default_button_key;
 344     NSString *alternate_button_key;
 345     NSString *other_button_key;
 346     NSString *info_message_key;
 347     NSString *domain;
 348     char *op = NULL;
 349     CFOptionFlags response = 0 | kCFUserNotificationCancelResponse;
 350     BOOL alert_sem_held = NO;
 351
 352 check_database:
 353     /* If we have previously allowed this operation/domain for this client,
 354      * check and don't prompt again.
 355      */
 356     ; /* %%% TBD */
 357
 358     /* Only display one alert at a time. */
 359         static dispatch_semaphore_t alert_sem;
 360         static dispatch_once_t alert_once;
 361         dispatch_once(&alert_once, ^{
 362                 if (!(alert_sem = dispatch_semaphore_create(1)))
 363                         abort();
 364         });
 365         if (!alert_sem_held) {
 366                 alert_sem_held = YES;
 367                 if (dispatch_semaphore_wait(alert_sem, DISPATCH_TIME_NOW)) {
 368                         /* Wait for the active alert, then recheck the database in case both alerts are for the same client. */
 369                         //asl_log(NULL, NULL, ASL_LEVEL_NOTICE, "Delaying prompt for pid %d", pid);
 370                         dispatch_semaphore_wait(alert_sem, DISPATCH_TIME_FOREVER);
 371                         goto check_database;
 372                 }
 373         }
 374
 375 #if TARGET_IPHONE_SIMULATOR
 376     security_path = [NSString stringWithFormat:@"%s%@", getenv("IPHONE_SIMULATOR_ROOT"), security_path];
 377 #endif
 378     security_bundle = [NSBundle bundleWithPath:security_path];
 379     notification_dictionary = [NSMutableDictionary dictionary];
 380     domain = nil;
 381     if (1 == [(__bridge NSArray *)domains count]) {
 382         domain = (NSString *)[(__bridge NSArray *)domains objectAtIndex:0];
 383     }
 384     switch (operation) {
 385         case swca_add_request_id:
 386             op = "ADD";
 387             break;
 388         case swca_update_request_id:
 389             op = "UPDATE";
 390             break;
 391         case swca_delete_request_id:
 392             op = "DELETE";
 393             break;
 394         case swca_copy_request_id:
 395             op = (domain) ? "COPY" : "COPYALL";
 396             break;
 397         default:
 398             op = "USE";
 399             break;
 400     }
 401     if (!op) {
 402         goto out;
 403     }
 404     request_key = [NSString stringWithFormat:@"SWC_REQUEST_%s", op];
 405     request_format = NSLocalizedStringFromTableInBundle(request_key, swc_table, security_bundle, nil);
 406     alternate_button_key = (op) ? [NSString stringWithFormat:@"SWC_ALLOW_%s", op] : nil;
 407     default_button_key = @"SWC_NEVER";
 408     other_button_key = @"SWC_DENY";
 409     info_message_key = @"SWC_INFO_MESSAGE";
 410
 411     notification_dictionary[(__bridge NSString *)kCFUserNotificationAlertHeaderKey] = [NSString stringWithFormat:request_format, client.client_name, domain];
 412     notification_dictionary[(__bridge NSString *)kCFUserNotificationAlertMessageKey] = NSLocalizedStringFromTableInBundle(info_message_key, swc_table, security_bundle, nil);
 413     notification_dictionary[(__bridge NSString *)kCFUserNotificationDefaultButtonTitleKey] = NSLocalizedStringFromTableInBundle(default_button_key, swc_table, security_bundle, nil);
 414     notification_dictionary[(__bridge NSString *)kCFUserNotificationAlternateButtonTitleKey] = NSLocalizedStringFromTableInBundle(alternate_button_key, swc_table, security_bundle, nil);
 415
 416     if (other_button_key) {
 417     // notification_dictionary[(__bridge NSString *)kCFUserNotificationOtherButtonTitleKey] = NSLocalizedStringFromTableInBundle(other_button_key, swc_table, security_bundle, nil);
 418     }
 419     notification_dictionary[(__bridge NSString *)kCFUserNotificationLocalizationURLKey] = [security_bundle bundleURL];
 420     notification_dictionary[(__bridge NSString *)SBUserNotificationAllowedApplicationsKey] = client.client;
 421
 422         SInt32 error;
 423         if (!(notification = CFUserNotificationCreate(NULL, 0, kCFUserNotificationStopAlertLevel | kCFUserNotificationNoDefaultButtonFlag, &error, (__bridge CFDictionaryRef)notification_dictionary)) ||
 424             error)
 425                 goto out;
 426         if (CFUserNotificationReceiveResponse(notification, 0, &response))
 427                 goto out;
 428
 429 out:
 430         if (alert_sem_held)
 431                 dispatch_semaphore_signal(alert_sem);
 432     if (notification)
 433         CFRelease(notification);
 434     return response;
 435 }
 436
 437 static bool swca_process_response(CFOptionFlags response, CFTypeRef *result)
 438 {
 439     int32_t value = (int32_t)(response & 0x3);
 440     CFNumberRef number = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &value);
 441     *result = number;
 442     return (NULL != number);
 443 }
 444
 445 static bool swca_confirm_add(CFDictionaryRef attributes, Client* client, CFArrayRef accessGroups, CFTypeRef *result, CFErrorRef *error)
 446 {
 447     CFStringRef domain = (CFStringRef) CFDictionaryGetValue(attributes, kSecAttrServer);
 448     CFArrayRef domains = CFArrayCreate(kCFAllocatorDefault, (const void **)&domain, 1, &kCFTypeArrayCallBacks);
 449     CFOptionFlags response = swca_handle_request(swca_add_request_id, client, domains);
 450     return swca_process_response(response, result);
 451 }
 452
 453 static bool swca_confirm_copy(CFDictionaryRef attributes, Client* client, CFArrayRef accessGroups, CFTypeRef *result, CFErrorRef *error)
 454 {
 455     CFStringRef domain = (CFStringRef) CFDictionaryGetValue(attributes, kSecAttrServer);
 456     CFArrayRef domains = CFArrayCreate(kCFAllocatorDefault, (const void **)&domain, 1, &kCFTypeArrayCallBacks);
 457     CFOptionFlags response = swca_handle_request(swca_copy_request_id, client, domains);
 458     return swca_process_response(response, result);
 459 }
 460
 461 static bool swca_confirm_update(CFDictionaryRef attributes, Client* client, CFArrayRef accessGroups, CFTypeRef *result, CFErrorRef *error)
 462 {
 463     CFStringRef domain = (CFStringRef) CFDictionaryGetValue(attributes, kSecAttrServer);
 464     CFArrayRef domains = CFArrayCreate(kCFAllocatorDefault, (const void **)&domain, 1, &kCFTypeArrayCallBacks);
 465     CFOptionFlags response = swca_handle_request(swca_update_request_id, client, domains);
 466     return swca_process_response(response, result);
 467 }
 468
 469 static bool swca_confirm_delete(CFDictionaryRef attributes, Client* client, CFArrayRef accessGroups, CFTypeRef *result, CFErrorRef *error)
 470 {
 471     CFStringRef domain = (CFStringRef) CFDictionaryGetValue(attributes, kSecAttrServer);
 472     CFArrayRef domains = CFArrayCreate(kCFAllocatorDefault, (const void **)&domain, 1, &kCFTypeArrayCallBacks);
 473     CFOptionFlags response = swca_handle_request(swca_delete_request_id, client, domains);
 474     return swca_process_response(response, result);
 475 }
 476
 477 static bool swca_select_item(CFArrayRef items, Client* client, CFArrayRef accessGroups, CFTypeRef *result, CFErrorRef *error)
 478 {
 479     CFUserNotificationRef notification = NULL;
 480     NSMutableDictionary *notification_dictionary = NULL;
 481     NSString *security_path = @"/System/Library/Frameworks/Security.framework";
 482     NSString *swc_table = @"SharedWebCredentials";
 483     NSBundle *security_bundle;
 484     NSString *request_title_format;
 485     NSString *info_message_key;
 486     NSString *default_button_key;
 487     NSString *alternate_button_key;
 488     CFOptionFlags response = 0 | kCFUserNotificationCancelResponse;
 489     CFIndex item_count = (items) ? CFArrayGetCount(items) : (CFIndex) 0;
 490     BOOL alert_sem_held = NO;
 491
 492     if (item_count < 1) {
 493         return false;
 494     }
 495
 496 entry:
 497     ;
 498     /* Only display one alert at a time. */
 499     static dispatch_semaphore_t select_alert_sem;
 500     static dispatch_once_t select_alert_once;
 501     dispatch_once(&select_alert_once, ^{
 502         if (!(select_alert_sem = dispatch_semaphore_create(1)))
 503             abort();
 504     });
 505     if (!alert_sem_held) {
 506         alert_sem_held = YES;
 507         if (dispatch_semaphore_wait(select_alert_sem, DISPATCH_TIME_NOW)) {
 508             /* Wait for the active alert */
 509             dispatch_semaphore_wait(select_alert_sem, DISPATCH_TIME_FOREVER);
 510             goto entry;
 511         }
 512     }
 513
 514     CFRetainSafe(items);
 515     CFReleaseSafe(gActiveArray);
 516     gActiveArray = items;
 517     CFReleaseSafe(gActiveItem);
 518     gActiveItem = NULL;  // selection will be set by remote view controller
 519     //gActiveItem = CFArrayGetValueAtIndex(items, 0);
 520     //CFRetainSafe(gActiveItem);
 521
 522 #if TARGET_IPHONE_SIMULATOR
 523     security_path = [NSString stringWithFormat:@"%s%@", getenv("IPHONE_SIMULATOR_ROOT"), security_path];
 524 #endif
 525     security_bundle = [NSBundle bundleWithPath:security_path];
 526     notification_dictionary = [NSMutableDictionary dictionary];
 527
 528     request_title_format = NSLocalizedStringFromTableInBundle(@"SWC_ALERT_TITLE", swc_table, security_bundle, nil);
 529     default_button_key = @"SWC_ALLOW_USE";
 530     alternate_button_key = @"SWC_CANCEL";
 531     info_message_key = @"SWC_INFO_MESSAGE";
 532
 533     notification_dictionary[(__bridge NSString *)kCFUserNotificationAlertHeaderKey] = [NSString stringWithFormat: request_title_format, client.client_name];
 534     notification_dictionary[(__bridge NSString *)kCFUserNotificationAlertMessageKey] = NSLocalizedStringFromTableInBundle(info_message_key, swc_table, security_bundle, nil);
 535     notification_dictionary[(__bridge NSString *)kCFUserNotificationDefaultButtonTitleKey] = NSLocalizedStringFromTableInBundle(default_button_key, swc_table, security_bundle, nil);
 536     notification_dictionary[(__bridge NSString *)kCFUserNotificationAlternateButtonTitleKey] = NSLocalizedStringFromTableInBundle(alternate_button_key, swc_table, security_bundle, nil);
 537
 538     notification_dictionary[(__bridge NSString *)kCFUserNotificationLocalizationURLKey] = [security_bundle bundleURL];
 539     notification_dictionary[(__bridge NSString *)kCFUserNotificationAlertTopMostKey] = [NSNumber numberWithBool:YES];
 540
 541     // additional keys for remote view controller
 542     notification_dictionary[(__bridge NSString *)SBUserNotificationDismissOnLock] = [NSNumber numberWithBool:YES];
 543     notification_dictionary[(__bridge NSString *)SBUserNotificationDontDismissOnUnlock] = [NSNumber numberWithBool:YES];
 544     notification_dictionary[(__bridge NSString *)SBUserNotificationRemoteServiceBundleIdentifierKey] = @"com.apple.SharedWebCredentialViewService";
 545     notification_dictionary[(__bridge NSString *)SBUserNotificationRemoteViewControllerClassNameKey] = @"SWCViewController";
 546     notification_dictionary[(__bridge NSString *)SBUserNotificationAllowedApplicationsKey] = client.client;
 547
 548     SInt32 err;
 549     if (!(notification = CFUserNotificationCreate(NULL, 0, 0, &err, (__bridge CFDictionaryRef)notification_dictionary)) ||
 550         err)
 551         goto out;
 552     if (CFUserNotificationReceiveResponse(notification, 0, &response))
 553         goto out;
 554
 555     //NSLog(@"Selection: %@, Response: %lu", gActiveItem, (unsigned long)response);
 556     if (result && response == kCFUserNotificationDefaultResponse) {
 557         CFRetainSafe(gActiveItem);
 558         *result = gActiveItem;
 559     }
 560
 561 out:
 562     if (alert_sem_held) {
 563         dispatch_semaphore_signal(select_alert_sem);
 564     }
 565     CFReleaseSafe(notification);
 566     CFReleaseNull(gActiveArray);
 567     CFReleaseNull(gActiveItem);
 568
 569     return (result && *result);
 570 }
 571
 572
 573 static void swca_xpc_dictionary_handler(const xpc_connection_t connection, xpc_object_t event) {
 574         xpc_type_t type = xpc_get_type(event);
 575     __block CFErrorRef error = NULL;
 576     xpc_object_t xpcError = NULL;
 577     xpc_object_t replyMessage = NULL;
 578     SecTaskRef clientTask = NULL;
 579     Client* client = NULL;
 580     CFArrayRef accessGroups = NULL;
 581
 582     secdebug("swcagent_xpc", "entering");
 583     if (type == XPC_TYPE_DICTIONARY) {
 584         replyMessage = xpc_dictionary_create_reply(event);
 585
 586         uint64_t operation = xpc_dictionary_get_uint64(event, kSecXPCKeyOperation);
 587         secdebug("swcagent_xpc", "operation: %@ (%" PRIu64 ")", SWCAGetOperationDescription((enum SWCAXPCOperation)operation), operation);
 588
 589         bool hasEntitlement;
 590         audit_token_t auditToken = {};
 591 #if !CHECK_ENTITLEMENTS
 592         hasEntitlement = true;
 593 #else
 594         // check our caller's private entitlement to invoke swcagent
 595         // TODO: on iOS it's enough to have the entitlement; will need to check code requirement on OS X
 596         xpc_connection_get_audit_token(connection, &auditToken);
 597         clientTask = SecTaskCreateWithAuditToken(kCFAllocatorDefault, auditToken);
 598         hasEntitlement = (clientTask && SecTaskGetBooleanValueForEntitlement(clientTask, kSecEntitlementPrivateAssociatedDomains));
 599         if (!hasEntitlement) {
 600             CFErrorRef entitlementError = NULL;
 601             SecError(errSecMissingEntitlement, &entitlementError, CFSTR("%@: %@ lacks entitlement %@"), SOSCCGetOperationDescription((enum SWCAXPCOperation)operation), clientTask, kSecEntitlementPrivateAssociatedDomains);
 602             CFReleaseSafe(entitlementError);
 603         }
 604         CFReleaseNull(clientTask);
 605 #endif
 606
 607         if (hasEntitlement) {
 608             // fetch audit token for process which called securityd
 609             size_t length = 0;
 610             const uint8_t *bytes = xpc_dictionary_get_data(event, kSecXPCKeyClientToken, &length);
 611             if (length == sizeof(audit_token_t)) {
 612                 memcpy(&auditToken, bytes, sizeof(audit_token_t));
 613             } else {
 614                 secerror("swcagent_xpc - wrong length for client id");
 615                 hasEntitlement = false;
 616             }
 617         }
 618         if (hasEntitlement) {
 619             // identify original client
 620             clientTask = SecTaskCreateWithAuditToken(kCFAllocatorDefault, auditToken);
 621             accessGroups = SecTaskCopyAccessGroups(clientTask);
 622             client = SecTaskCopyClient(clientTask);
 623 #if CHECK_ENTITLEMENTS
 624             // check for presence of original client's shared credential entitlement
 625             hasEntitlement = (clientTask && SecTaskGetBooleanValueForEntitlement(clientTask, kSecEntitlementAssociatedDomains));
 626             if (!hasEntitlement) {
 627                 CFErrorRef entitlementError = NULL;
 628                 SecError(errSecMissingEntitlement, &entitlementError, CFSTR("%@: %@ lacks entitlement %@"), SOSCCGetOperationDescription((enum SWCAXPCOperation)operation), clientTask, kSecEntitlementAssociatedDomains);
 629                 CFReleaseSafe(entitlementError);
 630             }
 631 #endif
 632             CFReleaseNull(clientTask);
 633         }
 634
 635         if (hasEntitlement) {
 636             switch (operation)
 637             {
 638             case swca_add_request_id:
 639             {
 640                 CFDictionaryRef query = SecXPCDictionaryCopyDictionary(event, kSecXPCKeyQuery, &error);
 641                 //secdebug("ipc", "swcagent: got swca_add_request_id, query: %@", query);
 642                 if (query) {
 643                     CFTypeRef result = NULL;
 644                     // confirm that we can add this item
 645                     if (swca_confirm_add(query, client, accessGroups, &result, &error) && result) {
 646                         SecXPCDictionarySetPList(replyMessage, kSecXPCKeyResult, result, &error);
 647                         CFRelease(result);
 648                     }
 649                     CFRelease(query);
 650                 }
 651                 break;
 652             }
 653             case swca_copy_request_id:
 654             {
 655                 CFDictionaryRef query = SecXPCDictionaryCopyDictionary(event, kSecXPCKeyQuery, &error);
 656                 //secdebug("ipc", "swcagent: got swca_copy_request_id, query: %@", query);
 657                 if (query) {
 658                     CFTypeRef result = NULL;
 659                     // confirm that we can copy this item
 660                     if (swca_confirm_copy(query, client, accessGroups, &result, &error) && result) {
 661                         SecXPCDictionarySetPList(replyMessage, kSecXPCKeyResult, result, &error);
 662                         CFRelease(result);
 663                     }
 664                     CFRelease(query);
 665                 }
 666                 break;
 667             }
 668             case swca_update_request_id:
 669             {
 670                 CFDictionaryRef query = SecXPCDictionaryCopyDictionary(event, kSecXPCKeyQuery, &error);
 671                 //secdebug("ipc", "swcagent: got swca_update_request_id, query: %@", query);
 672                 if (query) {
 673                     CFTypeRef result = NULL;
 674                     // confirm that we can copy this item
 675                     if (swca_confirm_update(query, client, accessGroups, &result, &error) && result) {
 676                         SecXPCDictionarySetPList(replyMessage, kSecXPCKeyResult, result, &error);
 677                         CFRelease(result);
 678                     }
 679                     CFRelease(query);
 680                 }
 681                 break;
 682             }
 683             case swca_delete_request_id:
 684             {
 685                 CFDictionaryRef query = SecXPCDictionaryCopyDictionary(event, kSecXPCKeyQuery, &error);
 686                 //secdebug("ipc", "swcagent: got swca_delete_request_id, query: %@", query);
 687                 if (query) {
 688                     CFTypeRef result = NULL;
 689                     // confirm that we can copy this item
 690                     if (swca_confirm_delete(query, client, accessGroups, &result, &error) && result) {
 691                         SecXPCDictionarySetPList(replyMessage, kSecXPCKeyResult, result, &error);
 692                         CFRelease(result);
 693                     }
 694                     CFRelease(query);
 695                 }
 696                 break;
 697             }
 698             case swca_select_request_id:
 699             {
 700                 CFArrayRef items = SecXPCDictionaryCopyArray(event, kSecXPCKeyQuery, &error);
 701                 secdebug("ipc", "swcagent: got swca_select_request_id, items: %@", items);
 702                 if (items) {
 703                     CFTypeRef result = NULL;
 704                     // select a dictionary from an input array of dictionaries
 705                     if (swca_select_item(items, client, accessGroups, &result, &error) && result) {
 706                         SecXPCDictionarySetPList(replyMessage, kSecXPCKeyResult, result, &error);
 707                         CFRelease(result);
 708                     }
 709                     CFRelease(items);
 710                 }
 711                 break;
 712             }
 713             case swca_copy_pairs_request_id:
 714             {
 715                 secdebug("ipc", "swcagent: got swca_copy_pairs_request_id");
 716                 SecXPCDictionarySetPList(replyMessage, kSecXPCKeyResult, gActiveArray, &error);
 717                 break;
 718             }
 719             case swca_set_selection_request_id:
 720             {
 721                 CFDictionaryRef dict = SecXPCDictionaryCopyDictionary(event, kSecXPCKeyQuery, &error);
 722                 secdebug("ipc", "swcagent: got swca_set_selection_request_id, dict: %@", dict);
 723                 if (dict) {
 724                     int32_t value = (int32_t) 1;
 725                     CFNumberRef number = CFNumberCreate(kCFAllocatorDefault, kCFNumberSInt32Type, &value);
 726                     SecXPCDictionarySetPList(replyMessage, kSecXPCKeyResult, number, &error);
 727                     CFReleaseSafe(number);
 728                 }
 729                 CFReleaseSafe(gActiveItem);
 730                 gActiveItem = dict;
 731                 break;
 732             }
 733             case swca_enabled_request_id:
 734             {
 735                 // return Safari's password autofill enabled status
 736                 CFTypeRef result = (SWCAIsAutofillEnabled()) ? kCFBooleanTrue : kCFBooleanFalse;
 737                 SecXPCDictionarySetPList(replyMessage, kSecXPCKeyResult, result, &error);
 738             }
 739             default:
 740                 secdebug("ipc", "swcagent: got unsupported request id (%ld)", (long)operation);
 741                 break;
 742             }
 743         }
 744         if (error)
 745         {
 746             if(SecErrorGetOSStatus(error) == errSecItemNotFound)
 747                 secdebug("ipc", "%@ %@ %@", clientTask, SWCAGetOperationDescription((enum SWCAXPCOperation)operation), error);
 748             else
 749                 secerror("%@ %@ %@", clientTask, SWCAGetOperationDescription((enum SWCAXPCOperation)operation), error);
 750
 751             xpcError = SecCreateXPCObjectWithCFError(error);
 752             xpc_dictionary_set_value(replyMessage, kSecXPCKeyError, xpcError);
 753         } else if (replyMessage) {
 754             secdebug("ipc", "%@ %@ responding %@", clientTask, SWCAGetOperationDescription((enum SWCAXPCOperation)operation), replyMessage);
 755         }
 756     } else {
 757         SecCFCreateErrorWithFormat(kSecXPCErrorUnexpectedType, sSecXPCErrorDomain, NULL, &error, 0, CFSTR("Messages expect to be xpc dictionary, got: %@"), event);
 758         secerror("%@: returning error: %@", clientTask, error);
 759         xpcError = SecCreateXPCObjectWithCFError(error);
 760         replyMessage = xpc_create_reply_with_format(event, "{%string: %value}", kSecXPCKeyError, xpcError);
 761     }
 762
 763     if (replyMessage) {
 764         xpc_connection_send_message(connection, replyMessage);
 765     }
 766     CFReleaseSafe(error);
 767     CFReleaseSafe(accessGroups);
 768 }
 769
 770 static xpc_connection_t swclistener = NULL;
 771
 772 static void swca_xpc_init()
 773 {
 774     secdebug("swcagent_xpc", "start");
 775
 776     swclistener = xpc_connection_create_mach_service(kSWCAXPCServiceName, NULL, XPC_CONNECTION_MACH_SERVICE_LISTENER);
 777     if (!swclistener) {
 778         seccritical("swcagent failed to register xpc listener, exiting");
 779         abort();
 780     }
 781
 782     xpc_connection_set_event_handler(swclistener, ^(xpc_object_t connection) {
 783         if (xpc_get_type(connection) == XPC_TYPE_CONNECTION) {
 784             xpc_connection_set_event_handler(connection, ^(xpc_object_t event) {
 785                 if (xpc_get_type(event) == XPC_TYPE_DICTIONARY) {
 786                     dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
 787                         swca_xpc_dictionary_handler(connection, event);
 788                     });
 789                 }
 790             });
 791             xpc_connection_resume(connection);
 792         }
 793     });
 794     xpc_connection_resume(swclistener);
 795 }
 796
 797 int main(int argc, char *argv[])
 798 {
 799     @autoreleasepool {
 800         char *wait4debugger = getenv("WAIT4DEBUGGER");
 801         if (wait4debugger && !strcasecmp("YES", wait4debugger)) {
 802             seccritical("SIGSTOPing self, awaiting debugger");
 803             kill(getpid(), SIGSTOP);
 804             seccritical("Again, for good luck (or bad debuggers)");
 805             kill(getpid(), SIGSTOP);
 806         }
 807         swca_xpc_init();
 808         dispatch_main();
 809     }
 810 }
 811
 812 /* vi:set ts=4 sw=4 et: */