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_OSX
  90     special_handle = session_keybag_handle;
  91 #elif TARGET_OS_EMBEDDED
  92     special_handle = device_keybag_handle;
  93 #else
  94 #error "supported keybag target"
  95 #endif
  96
  97     kern_return_t kr = aks_get_system(special_handle, &handle);
  98     if (kr != kIOReturnSuccess) {
  99 #if TARGET_OS_EMBEDDED
 100         /* TODO: Remove this once the kext runs the daemon on demand if
 101          there is no system keybag. */
 102         int kb_state = MKBGetDeviceLockState(NULL);
 103         asl_log(NULL, NULL, ASL_LEVEL_INFO, "AppleKeyStore lock state: %d", kb_state);
 104 #endif
 105     }
 106     return true;
 107 }
 108
 109 #else /* !USE_KEYSTORE */
 110
 111 static bool hwaes_key_available(void)
 112 {
 113         return false;
 114 }
 115
 116 #endif /* USE_KEYSTORE */
 117
 118 /* Wrap takes a 128 - 256 bit key as input and returns output of
 119  inputsize + 64 bits.
 120  In bytes this means that a
 121  16 byte (128 bit) key returns a 24 byte wrapped key
 122  24 byte (192 bit) key returns a 32 byte wrapped key
 123  32 byte (256 bit) key returns a 40 byte wrapped key  */
 124 bool ks_crypt(CFTypeRef operation, keybag_handle_t keybag,
 125               keyclass_t keyclass, uint32_t textLength, const uint8_t *source, keyclass_t *actual_class, CFMutableDataRef dest, CFErrorRef *error) {
 126 #if USE_KEYSTORE
 127     kern_return_t kernResult = kIOReturnBadArgument;
 128
 129     int dest_len = (int)CFDataGetLength(dest);
 130     if (CFEqual(operation, kAKSKeyOpEncrypt)) {
 131         kernResult = aks_wrap_key(source, textLength, keyclass, keybag, CFDataGetMutableBytePtr(dest), &dest_len, actual_class);
 132     } else if (CFEqual(operation, kAKSKeyOpDecrypt) || CFEqual(operation, kAKSKeyOpDelete)) {
 133         kernResult = aks_unwrap_key(source, textLength, keyclass, keybag, CFDataGetMutableBytePtr(dest), &dest_len);
 134     }
 135
 136     if (kernResult != KERN_SUCCESS) {
 137         if ((kernResult == kIOReturnNotPermitted) || (kernResult == kIOReturnNotPrivileged)) {
 138             const char *substatus = "";
 139             if (keyclass == key_class_ck || keyclass == key_class_cku)
 140                 substatus = " (hiberation ?)";
 141             /* Access to item attempted while keychain is locked. */
 142             return SecError(errSecInteractionNotAllowed, error, CFSTR("ks_crypt: %x failed to '%@' item (class %"PRId32", bag: %"PRId32") Access to item attempted while keychain is locked%s."),
 143                             kernResult, operation, keyclass, keybag, substatus);
 144         } else if (kernResult == kIOReturnError) {
 145             /* Item can't be decrypted on this device, ever, so drop the item. */
 146             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."),
 147                             kernResult, operation, keyclass, keybag);
 148         } else {
 149             return SecError(errSecNotAvailable, error, CFSTR("ks_crypt: %x failed to '%@' item (class %"PRId32", bag: %"PRId32")"),
 150                             kernResult, operation, keyclass, keybag);
 151         }
 152     }
 153     else
 154         CFDataSetLength(dest, dest_len);
 155     return true;
 156 #else /* !USE_KEYSTORE */
 157     uint32_t dest_len = (uint32_t)CFDataGetLength(dest);
 158     if (CFEqual(operation, kAKSKeyOpEncrypt)) {
 159         /* The no encryption case. */
 160         if (dest_len >= textLength + 8) {
 161             memcpy(CFDataGetMutableBytePtr(dest), source, textLength);
 162             memset(CFDataGetMutableBytePtr(dest) + textLength, 8, 8);
 163             CFDataSetLength(dest, textLength + 8);
 164             *actual_class = keyclass;
 165         } else
 166             return SecError(errSecNotAvailable, error, CFSTR("ks_crypt: failed to wrap item (class %"PRId32")"), keyclass);
 167     } else if (CFEqual(operation, kAKSKeyOpDecrypt) || CFEqual(operation, kAKSKeyOpDelete)) {
 168         if (dest_len + 8 >= textLength) {
 169             memcpy(CFDataGetMutableBytePtr(dest), source, textLength - 8);
 170             CFDataSetLength(dest, textLength - 8);
 171         } else
 172             return SecError(errSecNotAvailable, error, CFSTR("ks_crypt: failed to unwrap item (class %"PRId32")"), keyclass);
 173     }
 174     return true;
 175 #endif /* USE_KEYSTORE */
 176 }
 177
 178 #if USE_KEYSTORE
 179 static bool ks_access_control_needed_error(CFErrorRef *error, CFDataRef access_control_data, CFTypeRef operation) {
 180     if (error == NULL)
 181         return false;
 182
 183     if (*error && CFErrorGetCode(*error) != errSecAuthNeeded) {
 184         // If we already had an error there, just leave it, no access_control specific error is needed here.
 185         return false;
 186     }
 187
 188     // Create new error instance which adds new access control data appended to existing
 189     CFMutableDictionaryRef user_info;
 190     if (*error) {
 191         CFDictionaryRef old_user_info = CFErrorCopyUserInfo(*error);
 192         user_info = CFDictionaryCreateMutableCopy(NULL, 0, old_user_info);
 193         CFRelease(old_user_info);
 194         CFReleaseNull(*error);
 195     } else {
 196         user_info = CFDictionaryCreateMutableForCFTypes(NULL);
 197     }
 198
 199     if (access_control_data) {
 200         CFNumberRef key = CFNumberCreateWithCFIndex(NULL, errSecAuthNeeded);
 201         CFMutableArrayRef acls;
 202         CFArrayRef old_acls = CFDictionaryGetValue(user_info, key);
 203         if (old_acls)
 204             acls = CFArrayCreateMutableCopy(NULL, 0, old_acls);
 205         else
 206             acls = CFArrayCreateMutableForCFTypes(NULL);
 207
 208         CFArrayRef pair = CFArrayCreateForCFTypes(NULL, access_control_data, operation, NULL);
 209         CFArrayAppendValue(acls, pair);
 210         CFRelease(pair);
 211
 212         CFDictionarySetValue(user_info, key, acls);
 213         CFRelease(key);
 214         CFRelease(acls);
 215
 216         *error = CFErrorCreate(NULL, kSecErrorDomain, errSecAuthNeeded, user_info);
 217     }
 218     else
 219         *error = CFErrorCreate(NULL, kSecErrorDomain, errSecAuthNeeded, NULL);
 220
 221     CFReleaseSafe(user_info);
 222     return false;
 223 }
 224
 225 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)
 226 {
 227     bool ok = false;
 228     CFDataRef ed_data = CFDataCreateWithBytesNoCopy(kCFAllocatorDefault, ed_blob, ed_blob_len, kCFAllocatorNull);
 229     CFDataRef key_data = CFDataCreateWithBytesNoCopy(kCFAllocatorDefault, key_blob, key_blob_len, kCFAllocatorNull);
 230
 231     if (ed_data && key_data) {
 232         CFDictionaryRef result_dict = CFDictionaryCreateForCFTypes(kCFAllocatorDefault, kSecKSKeyData1, ed_data, kSecKSKeyData2, key_data, NULL);
 233
 234         CFDataSetLength(mergedData, 0);
 235         CFDataRef der_data = CFPropertyListCreateDERData(kCFAllocatorDefault, result_dict, NULL);
 236         if (der_data) {
 237             CFDataAppend(mergedData, der_data);
 238             CFRelease(der_data);
 239             ok = CFDataGetLength(mergedData) > 0;
 240         }
 241         CFRelease(result_dict);
 242     }
 243
 244     CFReleaseSafe(ed_data);
 245     CFReleaseSafe(key_data);
 246     return ok;
 247 }
 248
 249 bool ks_separate_data_and_key(CFDictionaryRef blob_dict, CFDataRef *ed_data, CFDataRef *key_data)
 250 {
 251     bool ok = false;
 252     CFDataRef tmp_ed_data = CFDictionaryGetValue(blob_dict, kSecKSKeyData1);
 253     CFDataRef tmp_key_data = CFDictionaryGetValue(blob_dict, kSecKSKeyData2);
 254
 255     if (tmp_ed_data && tmp_key_data &&
 256         CFDataGetTypeID() == CFGetTypeID(tmp_ed_data) &&
 257         CFDataGetTypeID() == CFGetTypeID(tmp_key_data)) {
 258         *ed_data = CFRetain(tmp_ed_data);
 259         *key_data = CFRetain(tmp_key_data);
 260         ok = true;
 261     }
 262
 263     return ok;
 264 }
 265
 266 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)
 267 {
 268     const char *operation_string = "";
 269     if (CFEqual(operation, kAKSKeyOpDecrypt)) {
 270         operation_string = "decrypt";
 271     } else if (CFEqual(operation, kAKSKeyOpEncrypt)) {
 272         operation_string = "encrypt";
 273     } if (CFEqual(operation, kAKSKeyOpDelete)) {
 274         operation_string = "delete";
 275     }
 276
 277     if (aks_return == kAKSReturnNoPermission) {
 278         /* Keychain is locked. */
 279         SecError(errSecInteractionNotAllowed, error, CFSTR("aks_ref_key: %x failed to '%s' item (class %"PRId32", bag: %"PRId32") Access to item attempted while keychain is locked."),
 280                            aks_return, operation_string, keyclass, keybag);
 281     } else if (aks_return == kAKSReturnPolicyError || aks_return == kAKSReturnBadPassword) {
 282         if (aks_return == kAKSReturnBadPassword) {
 283             ACMContextRef acm_context_ref = ACMContextCreateWithExternalForm(CFDataGetBytePtr(acm_context_data), CFDataGetLength(acm_context_data));
 284             if (acm_context_ref) {
 285                 ACMContextRemovePassphraseCredentialsByPurposeAndScope(acm_context_ref, kACMPassphrasePurposeGeneral, kACMScopeContext);
 286                 ACMContextDelete(acm_context_ref, false);
 287             }
 288         }
 289
 290         /* Item needed authentication. */
 291         ks_access_control_needed_error(error, access_control_data, operation);
 292     } else if (aks_return == kAKSReturnError || aks_return == kAKSReturnPolicyInvalid) {
 293         /* Item can't be decrypted on this device, ever, so drop the item. */
 294         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."),
 295                           aks_return, operation_string, keyclass, keybag);
 296     } else {
 297         SecError(errSecNotAvailable, error, CFSTR("aks_ref_key: %x failed to '%s' item (class %"PRId32", bag: %"PRId32")"),
 298                           aks_return, operation_string, keyclass, keybag);
 299     }
 300
 301     return false;
 302 }
 303
 304 bool ks_encrypt_acl(keybag_handle_t keybag, keyclass_t keyclass, uint32_t textLength, const uint8_t *source,
 305                     CFMutableDataRef dest, CFDataRef auth_data, CFDataRef acm_context,
 306                     SecAccessControlRef access_control, CFErrorRef *error) {
 307     void *params = NULL, *der = NULL;
 308     size_t params_len = 0, der_len = 0;
 309     CFDataRef access_control_data = SecAccessControlCopyData(access_control);
 310     int aks_return = kAKSReturnSuccess;
 311     aks_ref_key_t key_handle = NULL;
 312
 313     /* Verify that we have credential handle, otherwise generate proper error containing ACL and operation requested. */
 314     bool ok = false;
 315     if (!acm_context || !SecAccessControlIsBound(access_control)) {
 316         require_quiet(ok = ks_access_control_needed_error(error, access_control_data, SecAccessControlIsBound(access_control) ? kAKSKeyOpEncrypt : CFSTR("")), out);
 317     }
 318
 319     aks_operation_optional_params(0, 0, CFDataGetBytePtr(auth_data), CFDataGetLength(auth_data), CFDataGetBytePtr(acm_context), (int)CFDataGetLength(acm_context), &params, &params_len);
 320     require_noerr_action_quiet(aks_return = aks_ref_key_create(keybag, keyclass, key_type_sym, params, params_len, &key_handle), out,
 321                                create_cferror_from_aks(aks_return, kAKSKeyOpEncrypt, keybag, keyclass, access_control_data, acm_context, error));
 322     require_noerr_action_quiet(aks_return = aks_ref_key_encrypt(key_handle, params, params_len, source, textLength, &der, &der_len), out,
 323                                create_cferror_from_aks(aks_return, kAKSKeyOpEncrypt, keybag, keyclass, access_control_data, acm_context, error));
 324     size_t key_blob_len;
 325     const void *key_blob = aks_ref_key_get_blob(key_handle, &key_blob_len);
 326     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."),
 327                                            aks_return, "encrypt", keyclass, keybag));
 328
 329     require_action_quiet(merge_der_in_to_data(der, der_len, key_blob, key_blob_len, dest), out,
 330                    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."),
 331                             aks_return, "encrypt", keyclass, keybag));
 332
 333     ok = true;
 334
 335 out:
 336     if (key_handle)
 337         aks_ref_key_free(&key_handle);
 338     if(params)
 339         free(params);
 340     if(der)
 341         free(der);
 342     CFReleaseSafe(access_control_data);
 343     return ok;
 344 }
 345
 346 bool ks_decrypt_acl(aks_ref_key_t ref_key, CFDataRef encrypted_data, CFMutableDataRef dest,
 347                   CFDataRef acm_context, CFDataRef caller_access_groups,
 348                   SecAccessControlRef access_control, CFErrorRef *error) {
 349     void *params = NULL, *der = NULL;
 350     const uint8_t *access_groups = caller_access_groups?CFDataGetBytePtr(caller_access_groups):NULL;
 351     size_t params_len = 0, der_len = 0, access_groups_len = caller_access_groups?CFDataGetLength(caller_access_groups):0;
 352     CFDataRef access_control_data = SecAccessControlCopyData(access_control);
 353     int aks_return = kAKSReturnSuccess;
 354
 355     /* Verify that we have credential handle, otherwise generate proper error containing ACL and operation requested. */
 356     bool ok = false;
 357     if (!acm_context) {
 358         require_quiet(ok = ks_access_control_needed_error(error, NULL, NULL), out);
 359     }
 360
 361     aks_operation_optional_params(access_groups, access_groups_len, 0, 0, CFDataGetBytePtr(acm_context), (int)CFDataGetLength(acm_context), &params, &params_len);
 362     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,
 363                                create_cferror_from_aks(aks_return, kAKSKeyOpDecrypt, 0, 0, access_control_data, acm_context, error));
 364     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."),
 365                                                   aks_return, "decrypt"));
 366
 367     CFPropertyListRef decoded_data = NULL;
 368     der_decode_plist(kCFAllocatorDefault, kCFPropertyListImmutable, &decoded_data, NULL, der, der + der_len);
 369     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."),
 370                                                            aks_return, "decrypt"));
 371     if (CFGetTypeID(decoded_data) == CFDataGetTypeID()) {
 372         CFDataSetLength(dest, 0);
 373         CFDataAppend(dest, decoded_data);
 374         CFRelease(decoded_data);
 375     }
 376     else {
 377         CFRelease(decoded_data);
 378         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."),
 379                                                         aks_return, "decrypt"));
 380     }
 381
 382     ok = true;
 383
 384 out:
 385     if(params)
 386         free(params);
 387     if(der)
 388         free(der);
 389     CFReleaseSafe(access_control_data);
 390     return ok;
 391 }
 392
 393 bool ks_delete_acl(aks_ref_key_t ref_key, CFDataRef encrypted_data,
 394                   CFDataRef acm_context, CFDataRef caller_access_groups,
 395                   SecAccessControlRef access_control, CFErrorRef *error) {
 396     void *params = NULL;
 397     CFDataRef access_control_data = NULL;
 398     int aks_return = kAKSReturnSuccess;
 399     bool ok = false;
 400
 401     nrequire_action_quiet(CFEqual(SecAccessControlGetConstraint(access_control, kAKSKeyOpDelete), kCFBooleanTrue), out, ok = true);
 402
 403     /* Verify that we have credential handle, otherwise generate proper error containing ACL and operation requested. */
 404     if (!acm_context) {
 405         require_quiet(ok = ks_access_control_needed_error(error, NULL, NULL), out);
 406     }
 407
 408     access_control_data = SecAccessControlCopyData(access_control);
 409     const uint8_t *access_groups = caller_access_groups?CFDataGetBytePtr(caller_access_groups):NULL;
 410     size_t params_len = 0, access_groups_len = caller_access_groups?CFDataGetLength(caller_access_groups):0;
 411     aks_operation_optional_params(access_groups, access_groups_len, 0, 0, CFDataGetBytePtr(acm_context), (int)CFDataGetLength(acm_context), &params, &params_len);
 412     require_noerr_action_quiet(aks_return = aks_ref_key_delete(ref_key, params, params_len), out,
 413                                create_cferror_from_aks(aks_return, kAKSKeyOpDelete, 0, 0, access_control_data, acm_context, error));
 414
 415     ok = true;
 416
 417 out:
 418     if(params)
 419         free(params);
 420     CFReleaseSafe(access_control_data);
 421     return ok;
 422 }
 423
 424 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) {
 425     const void* result = NULL;
 426     int aks_return = kAKSReturnSuccess;
 427     require_noerr_action_quiet(aks_ref_key_create_with_blob(keybag, CFDataGetBytePtr(key_data), CFDataGetLength(key_data), ref_key), out,
 428                                SecError(errSecNotAvailable, error, CFSTR("aks_ref_key: %x failed to '%s' item (bag: %"PRId32")"), aks_return, "create ref key with blob", keybag));
 429     result = aks_ref_key_get_external_data(*ref_key, external_data_len);
 430
 431 out:
 432     return result;
 433 }
 434 #endif
 435
 436 bool use_hwaes(void) {
 437     static bool use_hwaes;
 438     static dispatch_once_t check_once;
 439     dispatch_once(&check_once, ^{
 440         use_hwaes = hwaes_key_available();
 441         if (use_hwaes) {
 442             asl_log(NULL, NULL, ASL_LEVEL_INFO, "using hwaes key");
 443         } else {
 444             asl_log(NULL, NULL, ASL_LEVEL_ERR, "unable to access hwaes key");
 445         }
 446     });
 447     return use_hwaes;
 448 }
 449
 450 bool ks_open_keybag(CFDataRef keybag, CFDataRef password, keybag_handle_t *handle, CFErrorRef *error) {
 451 #if USE_KEYSTORE
 452     kern_return_t kernResult;
 453     if (!asData(keybag, error)) return false;
 454     kernResult = aks_load_bag(CFDataGetBytePtr(keybag), (int)CFDataGetLength(keybag), handle);
 455     if (kernResult)
 456         return SecKernError(kernResult, error, CFSTR("aks_load_bag failed: %@"), keybag);
 457
 458     if (password) {
 459         kernResult = aks_unlock_bag(*handle, CFDataGetBytePtr(password), (int)CFDataGetLength(password));
 460         if (kernResult) {
 461             aks_unload_bag(*handle);
 462             return SecKernError(kernResult, error, CFSTR("aks_unlock_bag failed"));
 463         }
 464     }
 465     return true;
 466 #else /* !USE_KEYSTORE */
 467     *handle = KEYBAG_NONE;
 468     return true;
 469 #endif /* USE_KEYSTORE */
 470 }
 471
 472 bool ks_close_keybag(keybag_handle_t keybag, CFErrorRef *error) {
 473 #if USE_KEYSTORE
 474         IOReturn kernResult = aks_unload_bag(keybag);
 475     if (kernResult) {
 476         return SecKernError(kernResult, error, CFSTR("aks_unload_bag failed"));
 477     }
 478 #endif /* USE_KEYSTORE */
 479     return true;
 480 }
 481