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 #include <CommonCrypto/CommonCryptor.h>
  47 #include <CommonCrypto/CommonCryptorSPI.h>
  48
  49
  50 /* g_keychain_handle is the keybag handle used for encrypting item in the keychain.
  51  For testing purposes, it can be set to something other than the default, with SecItemServerSetKeychainKeybag */
  52 #if USE_KEYSTORE
  53 #if TARGET_OS_MAC && !TARGET_OS_EMBEDDED
  54 keybag_handle_t g_keychain_keybag = session_keybag_handle;
  55 #else
  56 keybag_handle_t g_keychain_keybag = device_keybag_handle;
  57 #endif
  58 #else /* !USE_KEYSTORE */
  59 keybag_handle_t g_keychain_keybag = 0; /* 0 == device_keybag_handle, constant dictated by AKS */
  60 #endif /* USE_KEYSTORE */
  61
  62 const CFStringRef kSecKSKeyData1 = CFSTR("d1");
  63 const CFStringRef kSecKSKeyData2 = CFSTR("d2");
  64
  65 void SecItemServerSetKeychainKeybag(int32_t keybag)
  66 {
  67     g_keychain_keybag=keybag;
  68 }
  69
  70 void SecItemServerResetKeychainKeybag(void)
  71 {
  72 #if USE_KEYSTORE
  73 #if TARGET_OS_MAC && !TARGET_OS_EMBEDDED
  74     g_keychain_keybag = session_keybag_handle;
  75 #else
  76     g_keychain_keybag = device_keybag_handle;
  77 #endif
  78 #else /* !USE_KEYSTORE */
  79     g_keychain_keybag = 0; /* 0 == device_keybag_handle, constant dictated by AKS */
  80 #endif /* USE_KEYSTORE */
  81 }
  82
  83 #if USE_KEYSTORE
  84
  85 static bool hwaes_key_available(void)
  86 {
  87     keybag_handle_t handle = bad_keybag_handle;
  88     keybag_handle_t special_handle = bad_keybag_handle;
  89 #if TARGET_OS_MAC && !TARGET_OS_EMBEDDED
  90     special_handle = session_keybag_handle;
  91 #elif TARGET_OS_EMBEDDED
  92     special_handle = device_keybag_handle;
  93 #endif
  94     kern_return_t kr = aks_get_system(special_handle, &handle);
  95     if (kr != kIOReturnSuccess) {
  96 #if TARGET_OS_EMBEDDED
  97         /* TODO: Remove this once the kext runs the daemon on demand if
  98          there is no system keybag. */
  99         int kb_state = MKBGetDeviceLockState(NULL);
 100         asl_log(NULL, NULL, ASL_LEVEL_INFO, "AppleKeyStore lock state: %d", kb_state);
 101 #endif
 102     }
 103     return true;
 104 }
 105
 106 #else /* !USE_KEYSTORE */
 107
 108 static bool hwaes_key_available(void)
 109 {
 110         return false;
 111 }
 112
 113 #endif /* USE_KEYSTORE */
 114
 115 /* Wrap takes a 128 - 256 bit key as input and returns output of
 116  inputsize + 64 bits.
 117  In bytes this means that a
 118  16 byte (128 bit) key returns a 24 byte wrapped key
 119  24 byte (192 bit) key returns a 32 byte wrapped key
 120  32 byte (256 bit) key returns a 40 byte wrapped key  */
 121 bool ks_crypt(CFTypeRef operation, keybag_handle_t keybag,
 122               keyclass_t keyclass, uint32_t textLength, const uint8_t *source, keyclass_t *actual_class, CFMutableDataRef dest, CFErrorRef *error) {
 123 #if USE_KEYSTORE
 124     kern_return_t kernResult = kIOReturnBadArgument;
 125
 126     int dest_len = (int)CFDataGetLength(dest);
 127     if (CFEqual(operation, kAKSKeyOpEncrypt)) {
 128         kernResult = aks_wrap_key(source, textLength, keyclass, keybag, CFDataGetMutableBytePtr(dest), &dest_len, actual_class);
 129     } else if (CFEqual(operation, kAKSKeyOpDecrypt) || CFEqual(operation, kAKSKeyOpDelete)) {
 130         kernResult = aks_unwrap_key(source, textLength, keyclass, keybag, CFDataGetMutableBytePtr(dest), &dest_len);
 131     }
 132
 133     if (kernResult != KERN_SUCCESS) {
 134         if ((kernResult == kIOReturnNotPermitted) || (kernResult == kIOReturnNotPrivileged)) {
 135             /* Access to item attempted while keychain is locked. */
 136             return SecError(errSecInteractionNotAllowed, error, CFSTR("ks_crypt: %x failed to '%@' item (class %"PRId32", bag: %"PRId32") Access to item attempted while keychain is locked."),
 137                             kernResult, operation, keyclass, keybag);
 138         } else if (kernResult == kIOReturnError) {
 139             /* Item can't be decrypted on this device, ever, so drop the item. */
 140             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."),
 141                             kernResult, operation, keyclass, keybag);
 142         } else {
 143             return SecError(errSecNotAvailable, error, CFSTR("ks_crypt: %x failed to '%@' item (class %"PRId32", bag: %"PRId32")"),
 144                             kernResult, operation, keyclass, keybag);
 145         }
 146     }
 147     else
 148         CFDataSetLength(dest, dest_len);
 149     return true;
 150 #else /* !USE_KEYSTORE */
 151     uint32_t dest_len = (uint32_t)CFDataGetLength(dest);
 152     if (CFEqual(operation, kAKSKeyOpEncrypt)) {
 153         /* The no encryption case. */
 154         if (dest_len >= textLength + 8) {
 155             memcpy(CFDataGetMutableBytePtr(dest), source, textLength);
 156             memset(CFDataGetMutableBytePtr(dest) + textLength, 8, 8);
 157             CFDataSetLength(dest, textLength + 8);
 158             *actual_class = keyclass;
 159         } else
 160             return SecError(errSecNotAvailable, error, CFSTR("ks_crypt: failed to wrap item (class %"PRId32")"), keyclass);
 161     } else if (CFEqual(operation, kAKSKeyOpDecrypt) || CFEqual(operation, kAKSKeyOpDelete)) {
 162         if (dest_len + 8 >= textLength) {
 163             memcpy(CFDataGetMutableBytePtr(dest), source, textLength - 8);
 164             CFDataSetLength(dest, textLength - 8);
 165         } else
 166             return SecError(errSecNotAvailable, error, CFSTR("ks_crypt: failed to unwrap item (class %"PRId32")"), keyclass);
 167     }
 168     return true;
 169 #endif /* USE_KEYSTORE */
 170 }
 171
 172 #if USE_KEYSTORE
 173 static bool ks_access_control_needed_error(CFErrorRef *error, CFDataRef access_control_data, CFTypeRef operation) {
 174     if (error == NULL)
 175         return false;
 176
 177     if (*error && CFErrorGetCode(*error) != errSecAuthNeeded) {
 178         // If we already had an error there, just leave it, no access_control specific error is needed here.
 179         return false;
 180     }
 181
 182     // Create new error instance which adds new access control data appended to existing
 183     CFMutableDictionaryRef user_info;
 184     if (*error) {
 185         CFDictionaryRef old_user_info = CFErrorCopyUserInfo(*error);
 186         user_info = CFDictionaryCreateMutableCopy(NULL, 0, old_user_info);
 187         CFRelease(old_user_info);
 188         CFReleaseNull(*error);
 189     } else {
 190         user_info = CFDictionaryCreateMutableForCFTypes(NULL);
 191     }
 192
 193     if (access_control_data) {
 194         CFNumberRef key = CFNumberCreateWithCFIndex(NULL, errSecAuthNeeded);
 195         CFMutableArrayRef acls;
 196         CFArrayRef old_acls = CFDictionaryGetValue(user_info, key);
 197         if (old_acls)
 198             acls = CFArrayCreateMutableCopy(NULL, 0, old_acls);
 199         else
 200             acls = CFArrayCreateMutableForCFTypes(NULL);
 201
 202         CFArrayRef pair = CFArrayCreateForCFTypes(NULL, access_control_data, operation, NULL);
 203         CFArrayAppendValue(acls, pair);
 204         CFRelease(pair);
 205
 206         CFDictionarySetValue(user_info, key, acls);
 207         CFRelease(key);
 208         CFRelease(acls);
 209
 210         *error = CFErrorCreate(NULL, kSecErrorDomain, errSecAuthNeeded, user_info);
 211     }
 212     else
 213         *error = CFErrorCreate(NULL, kSecErrorDomain, errSecAuthNeeded, NULL);
 214
 215     CFReleaseSafe(user_info);
 216     return false;
 217 }
 218
 219 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)
 220 {
 221     bool ok = false;
 222     CFDataRef ed_data = CFDataCreateWithBytesNoCopy(kCFAllocatorDefault, ed_blob, ed_blob_len, kCFAllocatorNull);
 223     CFDataRef key_data = CFDataCreateWithBytesNoCopy(kCFAllocatorDefault, key_blob, key_blob_len, kCFAllocatorNull);
 224
 225     if (ed_data && key_data) {
 226         CFDictionaryRef result_dict = CFDictionaryCreateForCFTypes(kCFAllocatorDefault, kSecKSKeyData1, ed_data, kSecKSKeyData2, key_data, NULL);
 227
 228         CFDataSetLength(mergedData, 0);
 229         CFDataRef der_data = CFPropertyListCreateDERData(kCFAllocatorDefault, result_dict, NULL);
 230         if (der_data) {
 231             CFDataAppend(mergedData, der_data);
 232             CFRelease(der_data);
 233             ok = CFDataGetLength(mergedData) > 0;
 234         }
 235         CFRelease(result_dict);
 236     }
 237
 238     CFReleaseSafe(ed_data);
 239     CFReleaseSafe(key_data);
 240     return ok;
 241 }
 242
 243 bool ks_separate_data_and_key(CFDictionaryRef blob_dict, CFDataRef *ed_data, CFDataRef *key_data)
 244 {
 245     bool ok = false;
 246     CFDataRef tmp_ed_data = CFDictionaryGetValue(blob_dict, kSecKSKeyData1);
 247     CFDataRef tmp_key_data = CFDictionaryGetValue(blob_dict, kSecKSKeyData2);
 248
 249     if (tmp_ed_data && tmp_key_data &&
 250         CFDataGetTypeID() == CFGetTypeID(tmp_ed_data) &&
 251         CFDataGetTypeID() == CFGetTypeID(tmp_key_data)) {
 252         *ed_data = CFRetain(tmp_ed_data);
 253         *key_data = CFRetain(tmp_key_data);
 254         ok = true;
 255     }
 256
 257     return ok;
 258 }
 259
 260 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)
 261 {
 262     const char *operation_string = "";
 263     if (CFEqual(operation, kAKSKeyOpDecrypt)) {
 264         operation_string = "decrypt";
 265     } else if (CFEqual(operation, kAKSKeyOpEncrypt)) {
 266         operation_string = "encrypt";
 267     } if (CFEqual(operation, kAKSKeyOpDelete)) {
 268         operation_string = "delete";
 269     }
 270
 271     if (aks_return == kAKSReturnNoPermission) {
 272         /* Keychain is locked. */
 273         SecError(errSecInteractionNotAllowed, error, CFSTR("aks_ref_key: %x failed to '%s' item (class %"PRId32", bag: %"PRId32") Access to item attempted while keychain is locked."),
 274                            aks_return, operation_string, keyclass, keybag);
 275     } else if (aks_return == kAKSReturnPolicyError || aks_return == kAKSReturnBadPassword) {
 276         if (aks_return == kAKSReturnBadPassword) {
 277             ACMContextRef acm_context_ref = ACMContextCreateWithExternalForm(CFDataGetBytePtr(acm_context_data), CFDataGetLength(acm_context_data));
 278             if (acm_context_ref) {
 279                 ACMContextRemovePassphraseCredentialsByPurposeAndScope(acm_context_ref, kACMPassphrasePurposeGeneral, kACMScopeContext);
 280                 ACMContextDelete(acm_context_ref, false);
 281             }
 282         }
 283
 284         /* Item needed authentication. */
 285         ks_access_control_needed_error(error, access_control_data, operation);
 286     } else if (aks_return == kAKSReturnError || aks_return == kAKSReturnPolicyInvalid) {
 287         /* Item can't be decrypted on this device, ever, so drop the item. */
 288         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."),
 289                           aks_return, operation_string, keyclass, keybag);
 290     } else {
 291         SecError(errSecNotAvailable, error, CFSTR("aks_ref_key: %x failed to '%s' item (class %"PRId32", bag: %"PRId32")"),
 292                           aks_return, operation_string, keyclass, keybag);
 293     }
 294
 295     return false;
 296 }
 297
 298 bool ks_encrypt_acl(keybag_handle_t keybag, keyclass_t keyclass, uint32_t textLength, const uint8_t *source,
 299                     CFMutableDataRef dest, CFDataRef auth_data, CFDataRef acm_context,
 300                     SecAccessControlRef access_control, CFErrorRef *error) {
 301     void *params = NULL, *der = NULL;
 302     size_t params_len = 0, der_len = 0;
 303     CFDataRef access_control_data = SecAccessControlCopyData(access_control);
 304     int aks_return = kAKSReturnSuccess;
 305     aks_ref_key_t key_handle = NULL;
 306
 307     /* Verify that we have credential handle, otherwise generate proper error containing ACL and operation requested. */
 308     bool ok = false;
 309     if (!acm_context || !SecAccessControlIsBound(access_control)) {
 310         require_quiet(ok = ks_access_control_needed_error(error, access_control_data, SecAccessControlIsBound(access_control) ? kAKSKeyOpEncrypt : CFSTR("")), out);
 311     }
 312
 313     aks_operation_optional_params(0, 0, CFDataGetBytePtr(auth_data), CFDataGetLength(auth_data), CFDataGetBytePtr(acm_context), (int)CFDataGetLength(acm_context), &params, &params_len);
 314     require_noerr_action_quiet(aks_return = aks_ref_key_create(keybag, keyclass, key_type_sym, params, params_len, &key_handle), out,
 315                                create_cferror_from_aks(aks_return, kAKSKeyOpEncrypt, keybag, keyclass, access_control_data, acm_context, error));
 316     require_noerr_action_quiet(aks_return = aks_ref_key_encrypt(key_handle, params, params_len, source, textLength, &der, &der_len), out,
 317                                create_cferror_from_aks(aks_return, kAKSKeyOpEncrypt, keybag, keyclass, access_control_data, acm_context, error));
 318     size_t key_blob_len;
 319     const void *key_blob = aks_ref_key_get_blob(key_handle, &key_blob_len);
 320     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."),
 321                                            aks_return, "encrypt", keyclass, keybag));
 322
 323     require_action_quiet(merge_der_in_to_data(der, der_len, key_blob, key_blob_len, dest), out,
 324                    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."),
 325                             aks_return, "encrypt", keyclass, keybag));
 326
 327     ok = true;
 328
 329 out:
 330     if (key_handle)
 331         aks_ref_key_free(&key_handle);
 332     if(params)
 333         free(params);
 334     if(der)
 335         free(der);
 336     CFReleaseSafe(access_control_data);
 337     return ok;
 338 }
 339
 340 bool ks_decrypt_acl(aks_ref_key_t ref_key, CFDataRef encrypted_data, CFMutableDataRef dest,
 341                   CFDataRef acm_context, CFDataRef caller_access_groups,
 342                   SecAccessControlRef access_control, CFErrorRef *error) {
 343     void *params = NULL, *der = NULL;
 344     const uint8_t *access_groups = caller_access_groups?CFDataGetBytePtr(caller_access_groups):NULL;
 345     size_t params_len = 0, der_len = 0, access_groups_len = caller_access_groups?CFDataGetLength(caller_access_groups):0;
 346     CFDataRef access_control_data = SecAccessControlCopyData(access_control);
 347     int aks_return = kAKSReturnSuccess;
 348
 349     /* Verify that we have credential handle, otherwise generate proper error containing ACL and operation requested. */
 350     bool ok = false;
 351     if (!acm_context) {
 352         require_quiet(ok = ks_access_control_needed_error(error, NULL, NULL), out);
 353     }
 354
 355     aks_operation_optional_params(access_groups, access_groups_len, 0, 0, CFDataGetBytePtr(acm_context), (int)CFDataGetLength(acm_context), &params, &params_len);
 356     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,
 357                                create_cferror_from_aks(aks_return, kAKSKeyOpDecrypt, 0, 0, access_control_data, acm_context, error));
 358     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."),
 359                                                   aks_return, "decrypt"));
 360
 361     CFPropertyListRef decoded_data = NULL;
 362     der_decode_plist(kCFAllocatorDefault, kCFPropertyListImmutable, &decoded_data, NULL, der, der + der_len);
 363     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."),
 364                                                            aks_return, "decrypt"));
 365     if (CFGetTypeID(decoded_data) == CFDataGetTypeID()) {
 366         CFDataSetLength(dest, 0);
 367         CFDataAppend(dest, decoded_data);
 368         CFRelease(decoded_data);
 369     }
 370     else {
 371         CFRelease(decoded_data);
 372         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."),
 373                                                         aks_return, "decrypt"));
 374     }
 375
 376     ok = true;
 377
 378 out:
 379     if(params)
 380         free(params);
 381     if(der)
 382         free(der);
 383     CFReleaseSafe(access_control_data);
 384     return ok;
 385 }
 386
 387 bool ks_delete_acl(aks_ref_key_t ref_key, CFDataRef encrypted_data,
 388                   CFDataRef acm_context, CFDataRef caller_access_groups,
 389                   SecAccessControlRef access_control, CFErrorRef *error) {
 390     void *params = NULL;
 391     CFDataRef access_control_data = NULL;
 392     int aks_return = kAKSReturnSuccess;
 393     bool ok = false;
 394
 395     nrequire_action_quiet(CFEqual(SecAccessControlGetConstraint(access_control, kAKSKeyOpDelete), kCFBooleanTrue), out, ok = true);
 396
 397     /* Verify that we have credential handle, otherwise generate proper error containing ACL and operation requested. */
 398     if (!acm_context) {
 399         require_quiet(ok = ks_access_control_needed_error(error, NULL, NULL), out);
 400     }
 401
 402     access_control_data = SecAccessControlCopyData(access_control);
 403     const uint8_t *access_groups = caller_access_groups?CFDataGetBytePtr(caller_access_groups):NULL;
 404     size_t params_len = 0, access_groups_len = caller_access_groups?CFDataGetLength(caller_access_groups):0;
 405     aks_operation_optional_params(access_groups, access_groups_len, 0, 0, CFDataGetBytePtr(acm_context), (int)CFDataGetLength(acm_context), &params, &params_len);
 406     require_noerr_action_quiet(aks_return = aks_ref_key_delete(ref_key, params, params_len), out,
 407                                create_cferror_from_aks(aks_return, kAKSKeyOpDelete, 0, 0, access_control_data, acm_context, error));
 408
 409     ok = true;
 410
 411 out:
 412     if(params)
 413         free(params);
 414     CFReleaseSafe(access_control_data);
 415     return ok;
 416 }
 417
 418 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) {
 419     const void* result = NULL;
 420     int aks_return = kAKSReturnSuccess;
 421     require_noerr_action_quiet(aks_ref_key_create_with_blob(keybag, CFDataGetBytePtr(key_data), CFDataGetLength(key_data), ref_key), out,
 422                                SecError(errSecNotAvailable, error, CFSTR("aks_ref_key: %x failed to '%s' item (bag: %"PRId32")"), aks_return, "create ref key with blob", keybag));
 423     result = aks_ref_key_get_external_data(*ref_key, external_data_len);
 424
 425 out:
 426     return result;
 427 }
 428 #endif
 429
 430 bool use_hwaes(void) {
 431     static bool use_hwaes;
 432     static dispatch_once_t check_once;
 433     dispatch_once(&check_once, ^{
 434         use_hwaes = hwaes_key_available();
 435         if (use_hwaes) {
 436             asl_log(NULL, NULL, ASL_LEVEL_INFO, "using hwaes key");
 437         } else {
 438             asl_log(NULL, NULL, ASL_LEVEL_ERR, "unable to access hwaes key");
 439         }
 440     });
 441     return use_hwaes;
 442 }
 443
 444 bool ks_open_keybag(CFDataRef keybag, CFDataRef password, keybag_handle_t *handle, CFErrorRef *error) {
 445 #if USE_KEYSTORE
 446     kern_return_t kernResult;
 447     if (!asData(keybag, error)) return false;
 448     kernResult = aks_load_bag(CFDataGetBytePtr(keybag), (int)CFDataGetLength(keybag), handle);
 449     if (kernResult)
 450         return SecKernError(kernResult, error, CFSTR("aks_load_bag failed: %@"), keybag);
 451
 452     if (password) {
 453         kernResult = aks_unlock_bag(*handle, CFDataGetBytePtr(password), (int)CFDataGetLength(password));
 454         if (kernResult) {
 455             aks_unload_bag(*handle);
 456             return SecKernError(kernResult, error, CFSTR("aks_unlock_bag failed"));
 457         }
 458     }
 459     return true;
 460 #else /* !USE_KEYSTORE */
 461     *handle = KEYBAG_NONE;
 462     return true;
 463 #endif /* USE_KEYSTORE */
 464 }
 465
 466 bool ks_close_keybag(keybag_handle_t keybag, CFErrorRef *error) {
 467 #if USE_KEYSTORE
 468         IOReturn kernResult = aks_unload_bag(keybag);
 469     if (kernResult) {
 470         return SecKernError(kernResult, error, CFSTR("aks_unload_bag failed"));
 471     }
 472 #endif /* USE_KEYSTORE */
 473     return true;
 474 }
 475