+++ /dev/null
-/*
- * Copyright (c) 2015 Apple Inc. All Rights Reserved.
- *
- * @APPLE_LICENSE_HEADER_START@
- *
- * This file contains Original Code and/or Modifications of Original Code
- * as defined in and that are subject to the Apple Public Source License
- * Version 2.0 (the 'License'). You may not use this file except in
- * compliance with the License. Please obtain a copy of the License at
- * http://www.opensource.apple.com/apsl/ and read it before using this
- * file.
- *
- * The Original Code and all software distributed under the License are
- * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
- * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
- * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
- * Please see the License for the specific language governing rights and
- * limitations under the License.
- *
- * @APPLE_LICENSE_HEADER_END@
- */
-
-
-// Our Header
-#include <Security/SecureObjectSync/SOSBackupSliceKeyBag.h>
-
-
-// Needed headers for implementation
-#include "AssertMacros.h"
-#include <utilities/SecCFWrappers.h>
-#include <utilities/SecAKSWrappers.h>
-#include <utilities/SecBuffer.h>
-#include <utilities/SecCFError.h>
-#include <utilities/der_set.h>
-#include <utilities/der_plist_internal.h>
-#include <Security/SecRandom.h>
-#include <Security/SecureObjectSync/SOSPeerInfo.h>
-#include <Security/SecureObjectSync/SOSPeerInfoCollections.h>
-#include <Security/SecureObjectSync/SOSInternal.h>
-
-#include <corecrypto/ccec.h>
-#include <corecrypto/ccsha2.h>
-#include <corecrypto/ccrng.h>
-
-#include <limits.h>
-
-#include "SOSInternal.h"
-
-//
-// MARK: Type creation
-//
-
-CFGiblisFor(SOSBackupSliceKeyBag);
-
-const int kAKSBagSecretLength = 32;
-
-struct __OpaqueSOSBackupSliceKeyBag {
- CFRuntimeBase _base;
-
- CFDataRef aks_bag;
-
- CFSetRef peers;
- CFDictionaryRef wrapped_keys;
-};
-
-static void SOSBackupSliceKeyBagDestroy(CFTypeRef aObj) {
- SOSBackupSliceKeyBagRef vb = (SOSBackupSliceKeyBagRef) aObj;
-
- CFReleaseNull(vb->aks_bag);
- CFReleaseNull(vb->peers);
- CFReleaseNull(vb->wrapped_keys);
-}
-
-static CFStringRef SOSBackupSliceKeyBagCopyFormatDescription(CFTypeRef aObj, CFDictionaryRef formatOptions) {
- SOSBackupSliceKeyBagRef vb = (SOSBackupSliceKeyBagRef) aObj;
-
- CFMutableStringRef description = CFStringCreateMutable(kCFAllocatorDefault, 0);
-
- CFStringAppendFormat(description, NULL, CFSTR("<SOSBackupSliceKeyBag@%p %ld"), vb, vb->peers ? CFSetGetCount(vb->peers) : 0);
- CFStringAppend(description, CFSTR(">"));
-
- return description;
-}
-
-
-//
-// MARK: Encode/Decode
-//
-
-const uint8_t* der_decode_BackupSliceKeyBag(CFAllocatorRef allocator,
- SOSBackupSliceKeyBagRef* BackupSliceKeyBag, CFErrorRef *error,
- const uint8_t* der, const uint8_t *der_end) {
- if (der == NULL) return der;
-
- const uint8_t *result = NULL;
- SOSBackupSliceKeyBagRef vb = CFTypeAllocate(SOSBackupSliceKeyBag, struct __OpaqueSOSBackupSliceKeyBag, allocator);
- require_quiet(SecAllocationError(vb, error, CFSTR("View bag allocation failed")), fail);
-
- const uint8_t *sequence_end = NULL;
- der = ccder_decode_sequence_tl(&sequence_end, der, der_end);
- require_quiet(sequence_end == der_end, fail);
-
- der = der_decode_data(kCFAllocatorDefault, kCFPropertyListImmutable, &vb->aks_bag, error, der, sequence_end);
- vb->peers = SOSPeerInfoSetCreateFromArrayDER(kCFAllocatorDefault, &kSOSPeerSetCallbacks, error,
- &der, der_end);
- der = der_decode_dictionary(kCFAllocatorDefault, kCFPropertyListImmutable, &vb->wrapped_keys, error, der, sequence_end);
-
- require_quiet(SecRequirementError(der == der_end, error, CFSTR("Extra space in sequence")), fail);
-
- if (BackupSliceKeyBag)
- CFTransferRetained(*BackupSliceKeyBag, vb);
-
- result = der;
-
-fail:
- CFReleaseNull(vb);
- return result;
-}
-
-size_t der_sizeof_BackupSliceKeyBag(SOSBackupSliceKeyBagRef BackupSliceKeyBag, CFErrorRef *error) {
- size_t result = 0;
-
- size_t bag_size = der_sizeof_data(BackupSliceKeyBag->aks_bag, error);
- require_quiet(bag_size, fail);
-
- size_t peers_size = SOSPeerInfoSetGetDEREncodedArraySize(BackupSliceKeyBag->peers, error);
- require_quiet(peers_size, fail);
-
- size_t wrapped_keys_size = der_sizeof_dictionary(BackupSliceKeyBag->wrapped_keys, error);
- require_quiet(wrapped_keys_size, fail);
-
- result = ccder_sizeof(CCDER_CONSTRUCTED_SEQUENCE, bag_size + peers_size + wrapped_keys_size);
-
-fail:
- return result;
-}
-
-uint8_t* der_encode_BackupSliceKeyBag(SOSBackupSliceKeyBagRef set, CFErrorRef *error,
- const uint8_t *der, uint8_t *der_end) {
- uint8_t *result = NULL;
- if (der_end == NULL) return der_end;
-
- require_quiet(SecRequirementError(set != NULL, error, CFSTR("Null set passed to encode")), fail);
-
- der_end = ccder_encode_constructed_tl(CCDER_CONSTRUCTED_SEQUENCE, der_end, der,
- der_encode_data(set->aks_bag, error, der,
- SOSPeerInfoSetEncodeToArrayDER(set->peers, error, der,
- der_encode_dictionary(set->wrapped_keys, error, der, der_end))));
-
- require_quiet(der_end == der, fail);
-
- result = der_end;
-fail:
- return result;
-}
-
-
-SOSBackupSliceKeyBagRef SOSBackupSliceKeyBagCreateFromData(CFAllocatorRef allocator, CFDataRef data, CFErrorRef *error) {
- SOSBackupSliceKeyBagRef result = NULL;
- SOSBackupSliceKeyBagRef decodedBag = NULL;
-
- const uint8_t *der = CFDataGetBytePtr(data);
- const uint8_t *der_end = der + CFDataGetLength(data);
-
- der = der_decode_BackupSliceKeyBag(allocator, &decodedBag, error, der, der_end);
-
- require_quiet(SecRequirementError(der == der_end, error, CFSTR("Didn't consume all data supplied")), fail);
-
- CFTransferRetained(result, decodedBag);
-
-fail:
- CFReleaseNull(decodedBag);
- return result;
-}
-
-//
-// MARK: Construction
-//
-
-bool SOSBSKBIsGoodBackupPublic(CFDataRef publicKey, CFErrorRef *error) {
- bool result = false;
-
- ccec_pub_ctx_decl_cp(SOSGetBackupKeyCurveParameters(), pub_key);
-
- int cc_result = ccec_compact_import_pub(SOSGetBackupKeyCurveParameters(), CFDataGetLength(publicKey), CFDataGetBytePtr(publicKey), pub_key);
-
- require_action_quiet(cc_result == 0, exit, SOSErrorCreate(kSOSErrorDecodeFailure, error, NULL, CFSTR("Unable to decode public key: %@"), publicKey));
-
- result = true;
-exit:
- return result;
-
-}
-
-
-static CFDataRef SOSCopyECWrapped(CFDataRef publicKey, CFDataRef secret, CFErrorRef *error) {
- CFDataRef result = NULL;
-
- ccec_pub_ctx_decl_cp(SOSGetBackupKeyCurveParameters(), pub_key);
-
- int cc_result = ccec_compact_import_pub(SOSGetBackupKeyCurveParameters(), CFDataGetLength(publicKey), CFDataGetBytePtr(publicKey), pub_key);
-
- require_action_quiet(cc_result == 0, exit, SOSErrorCreate(kSOSErrorDecodeFailure, error, NULL, CFSTR("Unable to decode public key: %@"), publicKey));
-
- result = SOSCopyECWrappedData(pub_key, secret, error);
-
-exit:
- return result;
-}
-
-
-static CFDictionaryRef SOSBackupSliceKeyBagCopyWrappedKeys(SOSBackupSliceKeyBagRef vb, CFDataRef secret, CFErrorRef *error) {
- CFDictionaryRef result = NULL;
- CFMutableDictionaryRef wrappedKeys = CFDictionaryCreateMutableForCFTypes(kCFAllocatorDefault);
-
- __block bool success = true;
- CFSetForEach(vb->peers, ^(const void *value) {
- SOSPeerInfoRef pi = (SOSPeerInfoRef) value;
- if (isSOSPeerInfo(pi)) {
- CFStringRef id = SOSPeerInfoGetPeerID(pi);
- CFDataRef backupKey = SOSPeerInfoCopyBackupKey(pi);
-
- if (backupKey) {
- CFDataRef wrappedKey = SOSCopyECWrapped(backupKey, secret, error);
- if (wrappedKey) {
- CFDictionaryAddValue(wrappedKeys, id, wrappedKey);
- } else {
- success = false;
- }
- CFReleaseNull(wrappedKey);
- CFReleaseNull(backupKey);
- }
-
- }
- });
-
- if (success)
- CFTransferRetained(result, wrappedKeys);
-
- CFReleaseNull(wrappedKeys);
- return result;
-}
-
-static bool SOSBackupSliceKeyBagCreateBackupBag(SOSBackupSliceKeyBagRef vb, CFErrorRef* error) {
- CFReleaseNull(vb->aks_bag);
-
- // Choose a random key.
- PerformWithBufferAndClear(kAKSBagSecretLength, ^(size_t size, uint8_t *buffer) {
- SecRandomCopyBytes(kSecRandomDefault, size, buffer);
- CFDataRef secret = CFDataCreateWithBytesNoCopy(kCFAllocatorDefault, buffer, size, kCFAllocatorNull);
-
- CFAssignRetained(vb->wrapped_keys, SOSBackupSliceKeyBagCopyWrappedKeys(vb, secret, error));
- CFAssignRetained(vb->aks_bag, SecAKSCopyBackupBagWithSecret(size, buffer, error));
-
- CFReleaseSafe(secret);
- });
-
- return vb->aks_bag != NULL;
-}
-
-
-CFDataRef SOSBSKBCopyEncoded(SOSBackupSliceKeyBagRef BackupSliceKeyBag, CFErrorRef* error) {
- CFDataRef result = NULL;
- CFMutableDataRef encoded = NULL;
-
- size_t encodedSize = der_sizeof_BackupSliceKeyBag(BackupSliceKeyBag, error);
- require_quiet(encodedSize, fail);
-
- encoded = CFDataCreateMutableWithScratch(kCFAllocatorDefault, encodedSize);
- require_quiet(SecAllocationError(encoded, error, CFSTR("Faild to create scratch")), fail);
-
- uint8_t *encode_to = CFDataGetMutableBytePtr(encoded);
- uint8_t *encode_to_end = encode_to + CFDataGetLength(encoded);
- require_quiet(encode_to == der_encode_BackupSliceKeyBag(BackupSliceKeyBag, error, encode_to, encode_to_end), fail);
-
- CFTransferRetained(result, encoded);
-
-fail:
- CFReleaseSafe(encoded);
- return result;
-}
-
-static CFSetRef SOSBackupSliceKeyBagCreatePeerSet(CFAllocatorRef allocator, CFSetRef peers) {
- CFMutableSetRef result = CFSetCreateMutableForSOSPeerInfosByID(allocator);
-
- CFSetForEach(peers, ^(const void *value) {
- CFSetAddValue(result, value);
- });
-
- return result;
-}
-
-SOSBackupSliceKeyBagRef SOSBackupSliceKeyBagCreate(CFAllocatorRef allocator, CFSetRef peers, CFErrorRef* error) {
- SOSBackupSliceKeyBagRef result = NULL;
- SOSBackupSliceKeyBagRef vb = CFTypeAllocate(SOSBackupSliceKeyBag, struct __OpaqueSOSBackupSliceKeyBag, allocator);
- require_quiet(SecAllocationError(vb, error, CFSTR("View bag allocation failed")), fail);
-
- require_quiet(SecRequirementError(CFSetGetCount(peers) > 0, error, CFSTR("Need peers")), fail);
-
- vb->peers = SOSBackupSliceKeyBagCreatePeerSet(allocator, peers);
- vb->wrapped_keys = CFDictionaryCreateMutableForCFTypes(allocator);
-
- require_quiet(SOSBackupSliceKeyBagCreateBackupBag(vb, error), fail);
-
- CFTransferRetained(result, vb);
-
-fail:
- CFReleaseNull(vb);
- return result;
-}
-
-SOSBackupSliceKeyBagRef SOSBackupSliceKeyBagCreateDirect(CFAllocatorRef allocator, CFDataRef aks_bag, CFErrorRef *error)
-{
- SOSBackupSliceKeyBagRef result = NULL;
- SOSBackupSliceKeyBagRef vb = CFTypeAllocate(SOSBackupSliceKeyBag, struct __OpaqueSOSBackupSliceKeyBag, allocator);
- require_quiet(SecAllocationError(vb, error, CFSTR("View bag allocation failed")), fail);
-
- require_quiet(SecRequirementError(aks_bag, error, CFSTR("Need aks bag")), fail);
-
- vb->aks_bag = CFRetainSafe(aks_bag);
- vb->peers = CFSetCreateMutableForSOSPeerInfosByID(allocator);
- vb->wrapped_keys = CFDictionaryCreateMutableForCFTypes(allocator);
-
- CFTransferRetained(result, vb);
-
-fail:
- CFReleaseNull(vb);
- return result;
-}
-
-//
-// MARK: Use
-//
-
-bool SOSBSKBIsDirect(SOSBackupSliceKeyBagRef backupSliceKeyBag)
-{
- return 0 == CFSetGetCount(backupSliceKeyBag->peers);
-}
-
-CFDataRef SOSBSKBCopyAKSBag(SOSBackupSliceKeyBagRef backupSliceKeyBag, CFErrorRef* error)
-{
- return CFRetainSafe(backupSliceKeyBag->aks_bag);
-}
-
-CFSetRef SOSBSKBGetPeers(SOSBackupSliceKeyBagRef backupSliceKeyBag){
- return backupSliceKeyBag->peers;
-}
-
-static keybag_handle_t SOSBSKBLoadAndUnlockBagWithSecret(SOSBackupSliceKeyBagRef backupSliceKeyBag,
- size_t secretSize, const uint8_t *secret,
- CFErrorRef *error)
-{
-#if !TARGET_HAS_KEYSTORE
- return bad_keybag_handle;
-#else
- keybag_handle_t result = bad_keybag_handle;
- keybag_handle_t bag_handle = bad_keybag_handle;
-
- require_quiet(SecRequirementError(backupSliceKeyBag->aks_bag, error,
- CFSTR("No aks bag to load")), exit);
- require_quiet(SecRequirementError(CFDataGetLength(backupSliceKeyBag->aks_bag) < INT_MAX, error,
- CFSTR("No aks bag to load")), exit);
- require_quiet(SecRequirementError(secretSize <= INT_MAX, error,
- CFSTR("secret too big")), exit);
-
- kern_return_t aks_result;
- aks_result = aks_load_bag(CFDataGetBytePtr(backupSliceKeyBag->aks_bag),
- (int) CFDataGetLength(backupSliceKeyBag->aks_bag),
- &bag_handle);
- require_quiet(SecKernError(aks_result, error,
- CFSTR("aks_load_bag failed: %d"), aks_result), exit);
-
- aks_result = aks_unlock_bag(bag_handle, secret, (int) secretSize);
- require_quiet(SecKernError(aks_result, error,
- CFSTR("failed to unlock bag: %d"), aks_result), exit);
-
- result = bag_handle;
- bag_handle = bad_keybag_handle;
-
-exit:
- if (bag_handle != bad_keybag_handle) {
- (void) aks_unload_bag(bag_handle);
- }
-
- return result;
-#endif
-}
-
-keybag_handle_t SOSBSKBLoadAndUnlockWithPeerIDAndSecret(SOSBackupSliceKeyBagRef backupSliceKeyBag,
- CFStringRef peerID, CFDataRef peerSecret,
- CFErrorRef *error)
-{
- __block keybag_handle_t result = bad_keybag_handle;
-
- CFDataRef lookedUpData = CFDictionaryGetValue(backupSliceKeyBag->wrapped_keys, peerID);
- require_quiet(SecRequirementError(lookedUpData != NULL, error, CFSTR("%@ has no wrapped key in %@"), peerID, backupSliceKeyBag), exit);
-
- require_quiet(SOSPerformWithDeviceBackupFullKey(SOSGetBackupKeyCurveParameters(), peerSecret, error, ^(ccec_full_ctx_t fullKey) {
- SOSPerformWithUnwrappedData(fullKey, lookedUpData, error, ^(size_t size, uint8_t *buffer) {
- result = SOSBSKBLoadAndUnlockBagWithSecret(backupSliceKeyBag, size, buffer, error);
- });
- }), exit);
-
-exit:
- return result;
-}
-
-
-keybag_handle_t SOSBSKBLoadAndUnlockWithPeerSecret(SOSBackupSliceKeyBagRef backupSliceKeyBag,
- SOSPeerInfoRef peer, CFDataRef peerSecret,
- CFErrorRef *error)
-{
- return SOSBSKBLoadAndUnlockWithPeerIDAndSecret(backupSliceKeyBag, SOSPeerInfoGetPeerID(peer), peerSecret, error);
-}
-
-keybag_handle_t SOSBSKBLoadAndUnlockWithDirectSecret(SOSBackupSliceKeyBagRef backupSliceKeyBag,
- CFDataRef secret,
- CFErrorRef *error)
-{
- keybag_handle_t result = bad_keybag_handle;
- require_quiet(SecRequirementError(SOSBSKBIsDirect(backupSliceKeyBag), error, CFSTR("Not direct bag")), exit);
-
- result = SOSBSKBLoadAndUnlockBagWithSecret(backupSliceKeyBag,
- CFDataGetLength(secret),
- CFDataGetBytePtr(secret),
- error);
-
-exit:
- return result;
-}
projects / apple / security.git / blobdiff