OSX/sec/securityd/SecKeybagSupport.c

   1 /*
   2  * Copyright (c) 2006-2014 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 /*
  25  *  SecKeybagSupport.c - CoreFoundation-based constants and functions for
  26     access to Security items (certificates, keys, identities, and
  27     passwords.)
  28  */
  29
  30 #include <securityd/SecKeybagSupport.h>
  31
  32 #include <securityd/SecItemServer.h>
  33
  34 #if USE_KEYSTORE
  35 #include <IOKit/IOKitLib.h>
  36 #include <libaks.h>
  37 #include <libaks_acl_cf_keys.h>
  38 #include <utilities/der_plist.h>
  39 #include <corecrypto/ccder.h>
  40 #include <ACMLib.h>
  41 #if TARGET_OS_EMBEDDED
  42 #include <MobileKeyBag/MobileKeyBag.h>
  43 #endif
  44 #endif /* USE_KEYSTORE */
  45
  46
  47 /* g_keychain_handle is the keybag handle used for encrypting item in the keychain.
  48  For testing purposes, it can be set to something other than the default, with SecItemServerSetKeychainKeybag */
  49 #if USE_KEYSTORE
  50 #if TARGET_OS_MAC && !TARGET_OS_EMBEDDED
  51 keybag_handle_t g_keychain_keybag = session_keybag_handle;
  52 #else
  53 keybag_handle_t g_keychain_keybag = device_keybag_handle;
  54 #endif
  55 #else /* !USE_KEYSTORE */
  56 keybag_handle_t g_keychain_keybag = 0; /* 0 == device_keybag_handle, constant dictated by AKS */
  57 #endif /* USE_KEYSTORE */
  58
  59 const CFStringRef kSecKSKeyData1 = CFSTR("d1");
  60 const CFStringRef kSecKSKeyData2 = CFSTR("d2");
  61
  62 void SecItemServerSetKeychainKeybag(int32_t keybag)
  63 {
  64     g_keychain_keybag=keybag;
  65 }
  66
  67 void SecItemServerResetKeychainKeybag(void)
  68 {
  69 #if USE_KEYSTORE
  70 #if TARGET_OS_MAC && !TARGET_OS_EMBEDDED
  71     g_keychain_keybag = session_keybag_handle;
  72 #else
  73     g_keychain_keybag = device_keybag_handle;
  74 #endif
  75 #else /* !USE_KEYSTORE */
  76     g_keychain_keybag = 0; /* 0 == device_keybag_handle, constant dictated by AKS */
  77 #endif /* USE_KEYSTORE */
  78 }
  79
  80 #if USE_KEYSTORE
  81
  82 static bool hwaes_key_available(void)
  83 {
  84     keybag_handle_t handle = bad_keybag_handle;
  85     keybag_handle_t special_handle = bad_keybag_handle;
  86 #if TARGET_OS_MAC && !TARGET_OS_EMBEDDED
  87     special_handle = session_keybag_handle;
  88 #elif TARGET_OS_EMBEDDED
  89     special_handle = device_keybag_handle;
  90 #endif
  91     kern_return_t kr = aks_get_system(special_handle, &handle);
  92     if (kr != kIOReturnSuccess) {
  93 #if TARGET_OS_EMBEDDED
  94         /* TODO: Remove this once the kext runs the daemon on demand if
  95          there is no system keybag. */
  96         int kb_state = MKBGetDeviceLockState(NULL);
  97         asl_log(NULL, NULL, ASL_LEVEL_INFO, "AppleKeyStore lock state: %d", kb_state);
  98 #endif
  99     }
 100     return true;
 101 }
 102
 103 #else /* !USE_KEYSTORE */
 104
 105 static bool hwaes_key_available(void)
 106 {
 107         return false;
 108 }
 109
 110 #endif /* USE_KEYSTORE */
 111
 112 /* Wrap takes a 128 - 256 bit key as input and returns output of
 113  inputsize + 64 bits.
 114  In bytes this means that a
 115  16 byte (128 bit) key returns a 24 byte wrapped key
 116  24 byte (192 bit) key returns a 32 byte wrapped key
 117  32 byte (256 bit) key returns a 40 byte wrapped key  */
 118 bool ks_crypt(CFTypeRef operation, keybag_handle_t keybag,
 119               keyclass_t keyclass, uint32_t textLength, const uint8_t *source, keyclass_t *actual_class, CFMutableDataRef dest, CFErrorRef *error) {
 120 #if USE_KEYSTORE
 121     kern_return_t kernResult = kIOReturnBadArgument;
 122
 123     int dest_len = (int)CFDataGetLength(dest);
 124     if (CFEqual(operation, kAKSKeyOpEncrypt)) {
 125         kernResult = aks_wrap_key(source, textLength, keyclass, keybag, CFDataGetMutableBytePtr(dest), &dest_len, actual_class);
 126     } else if (CFEqual(operation, kAKSKeyOpDecrypt) || CFEqual(operation, kAKSKeyOpDelete)) {
 127         kernResult = aks_unwrap_key(source, textLength, keyclass, keybag, CFDataGetMutableBytePtr(dest), &dest_len);
 128     }
 129
 130     if (kernResult != KERN_SUCCESS) {
 131         if ((kernResult == kIOReturnNotPermitted) || (kernResult == kIOReturnNotPrivileged)) {
 132             /* Access to item attempted while keychain is locked. */
 133             return SecError(errSecInteractionNotAllowed, error, CFSTR("ks_crypt: %x failed to '%@' item (class %"PRId32", bag: %"PRId32") Access to item attempted while keychain is locked."),
 134                             kernResult, operation, keyclass, keybag);
 135         } else if (kernResult == kIOReturnError) {
 136             /* Item can't be decrypted on this device, ever, so drop the item. */
 137             return SecError(errSecDecode, error, CFSTR("ks_crypt: %x failed to '%@' item (class %"PRId32", bag: %"PRId32") Item can't be decrypted on this device, ever, so drop the item."),
 138                             kernResult, operation, keyclass, keybag);
 139         } else {
 140             return SecError(errSecNotAvailable, error, CFSTR("ks_crypt: %x failed to '%@' item (class %"PRId32", bag: %"PRId32")"),
 141                             kernResult, operation, keyclass, keybag);
 142         }
 143     }
 144     else
 145         CFDataSetLength(dest, dest_len);
 146     return true;
 147 #else /* !USE_KEYSTORE */
 148     uint32_t dest_len = (uint32_t)CFDataGetLength(dest);
 149     if (CFEqual(operation, kAKSKeyOpEncrypt)) {
 150         /* The no encryption case. */
 151         if (dest_len >= textLength + 8) {
 152             memcpy(CFDataGetMutableBytePtr(dest), source, textLength);
 153             memset(CFDataGetMutableBytePtr(dest) + textLength, 8, 8);
 154             CFDataSetLength(dest, textLength + 8);
 155             *actual_class = keyclass;
 156         } else
 157             return SecError(errSecNotAvailable, error, CFSTR("ks_crypt: failed to wrap item (class %"PRId32")"), keyclass);
 158     } else if (CFEqual(operation, kAKSKeyOpDecrypt) || CFEqual(operation, kAKSKeyOpDelete)) {
 159         if (dest_len + 8 >= textLength) {
 160             memcpy(CFDataGetMutableBytePtr(dest), source, textLength - 8);
 161             CFDataSetLength(dest, textLength - 8);
 162         } else
 163             return SecError(errSecNotAvailable, error, CFSTR("ks_crypt: failed to unwrap item (class %"PRId32")"), keyclass);
 164     }
 165     return true;
 166 #endif /* USE_KEYSTORE */
 167 }
 168
 169 #if USE_KEYSTORE
 170 static bool ks_access_control_needed_error(CFErrorRef *error, CFDataRef access_control_data, CFTypeRef operation) {
 171     if (error == NULL)
 172         return false;
 173
 174     if (*error && CFErrorGetCode(*error) != errSecAuthNeeded) {
 175         // If we already had an error there, just leave it, no access_control specific error is needed here.
 176         return false;
 177     }
 178
 179     // Create new error instance which adds new access control data appended to existing
 180     CFMutableDictionaryRef user_info;
 181     if (*error) {
 182         CFDictionaryRef old_user_info = CFErrorCopyUserInfo(*error);
 183         user_info = CFDictionaryCreateMutableCopy(NULL, 0, old_user_info);
 184         CFRelease(old_user_info);
 185         CFReleaseNull(*error);
 186     } else {
 187         user_info = CFDictionaryCreateMutableForCFTypes(NULL);
 188     }
 189
 190     if (access_control_data) {
 191         CFNumberRef key = CFNumberCreateWithCFIndex(NULL, errSecAuthNeeded);
 192         CFMutableArrayRef acls;
 193         CFArrayRef old_acls = CFDictionaryGetValue(user_info, key);
 194         if (old_acls)
 195             acls = CFArrayCreateMutableCopy(NULL, 0, old_acls);
 196         else
 197             acls = CFArrayCreateMutableForCFTypes(NULL);
 198
 199         CFArrayRef pair = CFArrayCreateForCFTypes(NULL, access_control_data, operation, NULL);
 200         CFArrayAppendValue(acls, pair);
 201         CFRelease(pair);
 202
 203         CFDictionarySetValue(user_info, key, acls);
 204         CFRelease(key);
 205         CFRelease(acls);
 206
 207         *error = CFErrorCreate(NULL, kSecErrorDomain, errSecAuthNeeded, user_info);
 208     }
 209     else
 210         *error = CFErrorCreate(NULL, kSecErrorDomain, errSecAuthNeeded, NULL);
 211
 212     CFReleaseSafe(user_info);
 213     return false;
 214 }
 215
 216 static bool merge_der_in_to_data(const void *ed_blob, size_t ed_blob_len, const void *key_blob, size_t key_blob_len, CFMutableDataRef mergedData)
 217 {
 218     bool ok = false;
 219     CFDataRef ed_data = CFDataCreateWithBytesNoCopy(kCFAllocatorDefault, ed_blob, ed_blob_len, kCFAllocatorNull);
 220     CFDataRef key_data = CFDataCreateWithBytesNoCopy(kCFAllocatorDefault, key_blob, key_blob_len, kCFAllocatorNull);
 221
 222     if (ed_data && key_data) {
 223         CFDictionaryRef result_dict = CFDictionaryCreateForCFTypes(kCFAllocatorDefault, kSecKSKeyData1, ed_data, kSecKSKeyData2, key_data, NULL);
 224
 225         CFDataSetLength(mergedData, 0);
 226         CFDataRef der_data = CFPropertyListCreateDERData(kCFAllocatorDefault, result_dict, NULL);
 227         if (der_data) {
 228             CFDataAppend(mergedData, der_data);
 229             CFRelease(der_data);
 230             ok = CFDataGetLength(mergedData) > 0;
 231         }
 232         CFRelease(result_dict);
 233     }
 234
 235     CFReleaseSafe(ed_data);
 236     CFReleaseSafe(key_data);
 237     return ok;
 238 }
 239
 240 bool ks_separate_data_and_key(CFDictionaryRef blob_dict, CFDataRef *ed_data, CFDataRef *key_data)
 241 {
 242     bool ok = false;
 243     CFDataRef tmp_ed_data = CFDictionaryGetValue(blob_dict, kSecKSKeyData1);
 244     CFDataRef tmp_key_data = CFDictionaryGetValue(blob_dict, kSecKSKeyData2);
 245
 246     if (tmp_ed_data && tmp_key_data &&
 247         CFDataGetTypeID() == CFGetTypeID(tmp_ed_data) &&
 248         CFDataGetTypeID() == CFGetTypeID(tmp_key_data)) {
 249         *ed_data = CFRetain(tmp_ed_data);
 250         *key_data = CFRetain(tmp_key_data);
 251         ok = true;
 252     }
 253
 254     return ok;
 255 }
 256
 257 static bool create_cferror_from_aks(int aks_return, CFTypeRef operation, keybag_handle_t keybag, keyclass_t keyclass, CFDataRef access_control_data, CFDataRef acm_context_data, CFErrorRef *error)
 258 {
 259     const char *operation_string = "";
 260     if (CFEqual(operation, kAKSKeyOpDecrypt)) {
 261         operation_string = "decrypt";
 262     } else if (CFEqual(operation, kAKSKeyOpEncrypt)) {
 263         operation_string = "encrypt";
 264     } if (CFEqual(operation, kAKSKeyOpDelete)) {
 265         operation_string = "delete";
 266     }
 267
 268     if (aks_return == kAKSReturnNoPermission) {
 269         /* Keychain is locked. */
 270         SecError(errSecInteractionNotAllowed, error, CFSTR("aks_ref_key: %x failed to '%s' item (class %"PRId32", bag: %"PRId32") Access to item attempted while keychain is locked."),
 271                            aks_return, operation_string, keyclass, keybag);
 272     } else if (aks_return == kAKSReturnPolicyError || aks_return == kAKSReturnBadPassword) {
 273         if (aks_return == kAKSReturnBadPassword) {
 274             ACMContextRef acm_context_ref = ACMContextCreateWithExternalForm(CFDataGetBytePtr(acm_context_data), CFDataGetLength(acm_context_data));
 275             if (acm_context_ref) {
 276                 ACMContextRemovePassphraseCredentialsByPurposeAndScope(acm_context_ref, kACMPassphrasePurposeGeneral, kACMScopeContext);
 277                 ACMContextDelete(acm_context_ref, false);
 278             }
 279         }
 280
 281         /* Item needed authentication. */
 282         ks_access_control_needed_error(error, access_control_data, operation);
 283     } else if (aks_return == kAKSReturnError || aks_return == kAKSReturnPolicyInvalid) {
 284         /* Item can't be decrypted on this device, ever, so drop the item. */
 285         SecError(errSecDecode, error, CFSTR("aks_ref_key: %x failed to '%s' item (class %"PRId32", bag: %"PRId32") Item can't be decrypted on this device, ever, so drop the item."),
 286                           aks_return, operation_string, keyclass, keybag);
 287     } else {
 288         SecError(errSecNotAvailable, error, CFSTR("aks_ref_key: %x failed to '%s' item (class %"PRId32", bag: %"PRId32")"),
 289                           aks_return, operation_string, keyclass, keybag);
 290     }
 291
 292     return false;
 293 }
 294
 295 bool ks_encrypt_acl(keybag_handle_t keybag, keyclass_t keyclass, uint32_t textLength, const uint8_t *source,
 296                     CFMutableDataRef dest, CFDataRef auth_data, CFDataRef acm_context,
 297                     SecAccessControlRef access_control, CFErrorRef *error) {
 298     void *params = NULL, *der = NULL;
 299     size_t params_len = 0, der_len = 0;
 300     CFDataRef access_control_data = SecAccessControlCopyData(access_control);
 301     int aks_return = kAKSReturnSuccess;
 302     aks_ref_key_t key_handle = NULL;
 303
 304     /* Verify that we have credential handle, otherwise generate proper error containing ACL and operation requested. */
 305     bool ok = false;
 306     if (!acm_context || !SecAccessControlIsBound(access_control)) {
 307         require_quiet(ok = ks_access_control_needed_error(error, access_control_data, SecAccessControlIsBound(access_control) ? kAKSKeyOpEncrypt : CFSTR("")), out);
 308     }
 309
 310     aks_operation_optional_params(0, 0, CFDataGetBytePtr(auth_data), CFDataGetLength(auth_data), CFDataGetBytePtr(acm_context), (int)CFDataGetLength(acm_context), &params, &params_len);
 311     require_noerr_action_quiet(aks_return = aks_ref_key_create(keybag, keyclass, key_type_sym, params, params_len, &key_handle), out,
 312                                create_cferror_from_aks(aks_return, kAKSKeyOpEncrypt, keybag, keyclass, access_control_data, acm_context, error));
 313     require_noerr_action_quiet(aks_return = aks_ref_key_encrypt(key_handle, params, params_len, source, textLength, &der, &der_len), out,
 314                                create_cferror_from_aks(aks_return, kAKSKeyOpEncrypt, keybag, keyclass, access_control_data, acm_context, error));
 315     size_t key_blob_len;
 316     const void *key_blob = aks_ref_key_get_blob(key_handle, &key_blob_len);
 317     require_action_quiet(key_blob, out, SecError(errSecDecode, error, CFSTR("ks_crypt_acl: %x failed to '%s' item (class %"PRId32", bag: %"PRId32") Item can't be encrypted due to invalid key data, so drop the item."),
 318                                            aks_return, "encrypt", keyclass, keybag));
 319
 320     require_action_quiet(merge_der_in_to_data(der, der_len, key_blob, key_blob_len, dest), out,
 321                    SecError(errSecDecode, error, CFSTR("ks_crypt_acl: %x failed to '%s' item (class %"PRId32", bag: %"PRId32") Item can't be encrypted due to merge failed, so drop the item."),
 322                             aks_return, "encrypt", keyclass, keybag));
 323
 324     ok = true;
 325
 326 out:
 327     if (key_handle)
 328         aks_ref_key_free(&key_handle);
 329     if(params)
 330         free(params);
 331     if(der)
 332         free(der);
 333     CFReleaseSafe(access_control_data);
 334     return ok;
 335 }
 336
 337 bool ks_decrypt_acl(aks_ref_key_t ref_key, CFDataRef encrypted_data, CFMutableDataRef dest,
 338                   CFDataRef acm_context, CFDataRef caller_access_groups,
 339                   SecAccessControlRef access_control, CFErrorRef *error) {
 340     void *params = NULL, *der = NULL;
 341     const uint8_t *access_groups = caller_access_groups?CFDataGetBytePtr(caller_access_groups):NULL;
 342     size_t params_len = 0, der_len = 0, access_groups_len = caller_access_groups?CFDataGetLength(caller_access_groups):0;
 343     CFDataRef access_control_data = SecAccessControlCopyData(access_control);
 344     int aks_return = kAKSReturnSuccess;
 345
 346     /* Verify that we have credential handle, otherwise generate proper error containing ACL and operation requested. */
 347     bool ok = false;
 348     if (!acm_context) {
 349         require_quiet(ok = ks_access_control_needed_error(error, NULL, NULL), out);
 350     }
 351
 352     aks_operation_optional_params(access_groups, access_groups_len, 0, 0, CFDataGetBytePtr(acm_context), (int)CFDataGetLength(acm_context), &params, &params_len);
 353     require_noerr_action_quiet(aks_return = aks_ref_key_decrypt(ref_key, params, params_len, CFDataGetBytePtr(encrypted_data), CFDataGetLength(encrypted_data), &der, &der_len), out,
 354                                create_cferror_from_aks(aks_return, kAKSKeyOpDecrypt, 0, 0, access_control_data, acm_context, error));
 355     require_action_quiet(der, out, SecError(errSecDecode, error, CFSTR("ks_crypt_acl: %x failed to '%s' item, Item can't be decrypted due to invalid der data, so drop the item."),
 356                                                   aks_return, "decrypt"));
 357
 358     CFPropertyListRef decoded_data = NULL;
 359     der_decode_plist(kCFAllocatorDefault, kCFPropertyListImmutable, &decoded_data, NULL, der, der + der_len);
 360     require_action_quiet(decoded_data, out, SecError(errSecDecode, error, CFSTR("ks_crypt_acl: %x failed to '%s' item, Item can't be decrypted due to failed decode der, so drop the item."),
 361                                                            aks_return, "decrypt"));
 362     if (CFGetTypeID(decoded_data) == CFDataGetTypeID()) {
 363         CFDataSetLength(dest, 0);
 364         CFDataAppend(dest, decoded_data);
 365         CFRelease(decoded_data);
 366     }
 367     else {
 368         CFRelease(decoded_data);
 369         require_action_quiet(false, out, SecError(errSecDecode, error, CFSTR("ks_crypt_acl: %x failed to '%s' item, Item can't be decrypted due to wrong data, so drop the item."),
 370                                                         aks_return, "decrypt"));
 371     }
 372
 373     ok = true;
 374
 375 out:
 376     if(params)
 377         free(params);
 378     if(der)
 379         free(der);
 380     CFReleaseSafe(access_control_data);
 381     return ok;
 382 }
 383
 384 bool ks_delete_acl(aks_ref_key_t ref_key, CFDataRef encrypted_data,
 385                   CFDataRef acm_context, CFDataRef caller_access_groups,
 386                   SecAccessControlRef access_control, CFErrorRef *error) {
 387     void *params = NULL;
 388     CFDataRef access_control_data = NULL;
 389     int aks_return = kAKSReturnSuccess;
 390     bool ok = false;
 391
 392     nrequire_action_quiet(CFEqual(SecAccessControlGetConstraint(access_control, kAKSKeyOpDelete), kCFBooleanTrue), out, ok = true);
 393
 394     /* Verify that we have credential handle, otherwise generate proper error containing ACL and operation requested. */
 395     if (!acm_context) {
 396         require_quiet(ok = ks_access_control_needed_error(error, NULL, NULL), out);
 397     }
 398
 399     access_control_data = SecAccessControlCopyData(access_control);
 400     const uint8_t *access_groups = caller_access_groups?CFDataGetBytePtr(caller_access_groups):NULL;
 401     size_t params_len = 0, access_groups_len = caller_access_groups?CFDataGetLength(caller_access_groups):0;
 402     aks_operation_optional_params(access_groups, access_groups_len, 0, 0, CFDataGetBytePtr(acm_context), (int)CFDataGetLength(acm_context), &params, &params_len);
 403     require_noerr_action_quiet(aks_return = aks_ref_key_delete(ref_key, params, params_len), out,
 404                                create_cferror_from_aks(aks_return, kAKSKeyOpDelete, 0, 0, access_control_data, acm_context, error));
 405
 406     ok = true;
 407
 408 out:
 409     if(params)
 410         free(params);
 411     CFReleaseSafe(access_control_data);
 412     return ok;
 413 }
 414
 415 const void* ks_ref_key_get_external_data(keybag_handle_t keybag, CFDataRef key_data, aks_ref_key_t *ref_key, size_t *external_data_len, CFErrorRef *error) {
 416     const void* result = NULL;
 417     int aks_return = kAKSReturnSuccess;
 418     require_noerr_action_quiet(aks_ref_key_create_with_blob(keybag, CFDataGetBytePtr(key_data), CFDataGetLength(key_data), ref_key), out,
 419                                SecError(errSecNotAvailable, error, CFSTR("aks_ref_key: %x failed to '%s' item (bag: %"PRId32")"), aks_return, "create ref key with blob", keybag));
 420     result = aks_ref_key_get_external_data(*ref_key, external_data_len);
 421
 422 out:
 423     return result;
 424 }
 425 #endif
 426
 427 bool use_hwaes(void) {
 428     static bool use_hwaes;
 429     static dispatch_once_t check_once;
 430     dispatch_once(&check_once, ^{
 431         use_hwaes = hwaes_key_available();
 432         if (use_hwaes) {
 433             asl_log(NULL, NULL, ASL_LEVEL_INFO, "using hwaes key");
 434         } else {
 435             asl_log(NULL, NULL, ASL_LEVEL_ERR, "unable to access hwaes key");
 436         }
 437     });
 438     return use_hwaes;
 439 }
 440
 441 bool ks_open_keybag(CFDataRef keybag, CFDataRef password, keybag_handle_t *handle, CFErrorRef *error) {
 442 #if USE_KEYSTORE
 443     kern_return_t kernResult;
 444     if (!asData(keybag, error)) return false;
 445     kernResult = aks_load_bag(CFDataGetBytePtr(keybag), (int)CFDataGetLength(keybag), handle);
 446     if (kernResult)
 447         return SecKernError(kernResult, error, CFSTR("aks_load_bag failed: %@"), keybag);
 448
 449     if (password) {
 450         kernResult = aks_unlock_bag(*handle, CFDataGetBytePtr(password), (int)CFDataGetLength(password));
 451         if (kernResult) {
 452             aks_unload_bag(*handle);
 453             return SecKernError(kernResult, error, CFSTR("aks_unlock_bag failed"));
 454         }
 455     }
 456     return true;
 457 #else /* !USE_KEYSTORE */
 458     *handle = KEYBAG_NONE;
 459     return true;
 460 #endif /* USE_KEYSTORE */
 461 }
 462
 463 bool ks_close_keybag(keybag_handle_t keybag, CFErrorRef *error) {
 464 #if USE_KEYSTORE
 465         IOReturn kernResult = aks_unload_bag(keybag);
 466     if (kernResult) {
 467         return SecKernError(kernResult, error, CFSTR("aks_unload_bag failed"));
 468     }
 469 #endif /* USE_KEYSTORE */
 470     return true;
 471 }