--- /dev/null
+/*
+ * Copyright (c) 2012-2014 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@
+ */
+
+
+#include <Security/SecureObjectSync/SOSInternal.h>
+#include <Security/SecureObjectSync/SOSCircle.h>
+#include <Security/SecureObjectSync/SOSCloudCircle.h>
+#include <Security/SecureObjectSync/SOSKVSKeys.h>
+#include "utilities/SecCFError.h"
+#include "utilities/SecCFRelease.h"
+#include "utilities/SecCFWrappers.h"
+#include "utilities/iOSforOSX.h"
+
+#include <CoreFoundation/CoreFoundation.h>
+
+#include <Security/SecKey.h>
+#include <Security/SecKeyPriv.h>
+#include <Security/SecItem.h>
+#include <securityd/SecDbItem.h> // For SecError
+#include "utilities/iOSforOSX.h"
+
+#include <Security/SecBase64.h>
+#include <utilities/der_plist.h>
+#include <utilities/der_plist_internal.h>
+#include <corecrypto/ccder.h>
+#include <utilities/der_date.h>
+
+#include <corecrypto/ccrng.h>
+#include <corecrypto/ccrng_pbkdf2_prng.h>
+
+#include <CommonCrypto/CommonRandomSPI.h>
+
+#include <AssertMacros.h>
+
+CFStringRef kSOSErrorDomain = CFSTR("com.apple.security.sos.error");
+
+bool SOSErrorCreate(CFIndex errorCode, CFErrorRef *error, CFDictionaryRef formatOptions, CFStringRef format, ...) {
+ if (!errorCode) return true;
+ if (error && !*error) {
+ va_list va;
+ va_start(va, format);
+ SecCFCreateErrorWithFormatAndArguments(errorCode, kSOSErrorDomain, NULL, error, formatOptions, format, va);
+ va_end(va);
+ }
+ return false;
+}
+
+bool SOSCreateError(CFIndex errorCode, CFStringRef descriptionString, CFErrorRef previousError, CFErrorRef *newError) {
+ SOSCreateErrorWithFormat(errorCode, previousError, newError, NULL, CFSTR("%@"), descriptionString);
+ return true;
+}
+
+bool SOSCreateErrorWithFormat(CFIndex errorCode, CFErrorRef previousError, CFErrorRef *newError,
+ CFDictionaryRef formatOptions, CFStringRef format, ...) {
+ va_list va;
+ va_start(va, format);
+ bool res = SOSCreateErrorWithFormatAndArguments(errorCode, previousError, newError, formatOptions, format, va);
+ va_end(va);
+ return res;
+}
+
+bool SOSCreateErrorWithFormatAndArguments(CFIndex errorCode, CFErrorRef previousError, CFErrorRef *newError,
+ CFDictionaryRef formatOptions, CFStringRef format, va_list args) {
+ SecCFCreateErrorWithFormatAndArguments(errorCode, kSOSErrorDomain, previousError, newError, formatOptions, format, args);
+ return true;
+}
+
+
+//
+// Utility Functions
+//
+
+static OSStatus GenerateECPairImp(int keySize, CFBooleanRef permanent, SecKeyRef* public, SecKeyRef *full)
+{
+ static const CFStringRef sTempNameToUse = CFSTR("GenerateECPair Temporary Key - Shouldn't be live");
+
+ CFNumberRef signing_bitsize = CFNumberCreate(kCFAllocatorDefault, kCFNumberIntType, &keySize);
+
+ CFDictionaryRef keygen_parameters = CFDictionaryCreateForCFTypes(kCFAllocatorDefault,
+ kSecAttrKeyType, kSecAttrKeyTypeEC,
+ kSecAttrKeySizeInBits, signing_bitsize,
+ kSecAttrIsPermanent, permanent,
+ kSecAttrLabel, sTempNameToUse,
+ NULL);
+ CFReleaseNull(signing_bitsize);
+ OSStatus result = SecKeyGeneratePair(keygen_parameters, public, full);
+ CFReleaseNull(keygen_parameters);
+
+ return result;
+}
+
+OSStatus GenerateECPair(int keySize, SecKeyRef* public, SecKeyRef *full)
+{
+ return GenerateECPairImp(keySize, kCFBooleanFalse, public, full);
+}
+
+OSStatus GeneratePermanentECPair(int keySize, SecKeyRef* public, SecKeyRef *full)
+{
+ return GenerateECPairImp(keySize, kCFBooleanTrue, public, full);
+}
+
+static CFStringRef SOSCircleCopyDescriptionFromData(CFDataRef data)
+{
+ CFErrorRef error = NULL;
+ CFStringRef result = NULL;
+
+ SOSCircleRef circle = SOSCircleCreateFromData(kCFAllocatorDefault, data, &error);
+
+ if (circle)
+ result = CFStringCreateWithFormat(kCFAllocatorDefault, NULL, CFSTR("%@"), circle);
+
+ CFReleaseSafe(circle);
+
+ return result;
+}
+
+CFStringRef SOSItemsChangedCopyDescription(CFDictionaryRef changes, bool is_sender)
+{
+ CFMutableStringRef string = CFStringCreateMutableCopy(kCFAllocatorDefault, 0, CFSTR("<Changes: {\n"));
+
+ CFDictionaryForEach(changes, ^(const void *key, const void *value) {
+ CFStringRef value_description = NULL;
+ if (isString(key) && isData(value)) {
+ CFDataRef value_data = (CFDataRef) value;
+ switch (SOSKVSKeyGetKeyType(key)) {
+ case kCircleKey:
+ value_description = SOSCircleCopyDescriptionFromData(value_data);
+ break;
+ case kMessageKey:
+ value_description = CFCopyDescription(value_data);
+ break;
+ default:
+ break;
+ }
+
+ }
+ CFStringAppendFormat(string, NULL, CFSTR(" '%@' %s %@\n"),
+ key,
+ is_sender ? "<=" : "=>",
+ value_description ? value_description : value);
+
+ CFReleaseNull(value_description);
+ });
+
+ CFStringAppendFormat(string, NULL, CFSTR("}"));
+
+ return string;
+}
+
+CFStringRef SOSCopyIDOfKey(SecKeyRef key, CFErrorRef *error)
+{
+ const struct ccdigest_info * di = ccsha1_di();
+ CFDataRef publicBytes = NULL;
+ CFStringRef result = NULL;
+
+ uint8_t digest[di->output_size];
+ char encoded[2 * di->output_size]; // Big enough for base64 encoding.
+
+ require_quiet(SecError(SecKeyCopyPublicBytes(key, &publicBytes), error, CFSTR("Failed to export public bytes %@"), key), fail);
+
+ ccdigest(di, CFDataGetLength(publicBytes), CFDataGetBytePtr(publicBytes), digest);
+
+ size_t length = SecBase64Encode(digest, sizeof(digest), encoded, sizeof(encoded));
+ assert(length && length < sizeof(encoded));
+ if (length > 26)
+ length = 26;
+ encoded[length] = 0;
+ CFReleaseNull(publicBytes);
+ return CFStringCreateWithCString(kCFAllocatorDefault, encoded, kCFStringEncodingASCII);
+
+fail:
+ CFReleaseNull(publicBytes);
+ return result;
+}
+
+CFGiblisGetSingleton(ccec_const_cp_t, SOSGetBackupKeyCurveParameters, sBackupKeyCurveParameters, ^{
+ *sBackupKeyCurveParameters = ccec_cp_256();
+});
+
+
+//
+// We're expecting full entropy here, so we just need to stretch
+// via the PBKDF entropy rng. We'll choose a few iterations and no salt
+// since we don't get sent any.
+//
+const int kBackupKeyIterations = 20;
+const uint8_t sBackupKeySalt[] = { 0 };
+const int kBackupKeyMaxBytes = 256;
+
+bool SOSPerformWithDeviceBackupFullKey(ccec_const_cp_t cp, CFDataRef entropy, CFErrorRef *error, void (^operation)(ccec_full_ctx_t fullKey))
+{
+ bool result = false;
+ ccec_full_ctx_decl_cp(cp, fullKey);
+
+ require_quiet(SOSGenerateDeviceBackupFullKey(fullKey, cp, entropy, error), exit);
+
+ operation(fullKey);
+
+ result = true;
+exit:
+ ccec_full_ctx_clear_cp(cp, fullKey);
+
+ return result;
+}
+
+
+bool SOSGenerateDeviceBackupFullKey(ccec_full_ctx_t generatedKey, ccec_const_cp_t cp, CFDataRef entropy, CFErrorRef* error)
+{
+ bool result = false;
+ int cc_result = 0;
+ struct ccrng_pbkdf2_prng_state pbkdf2_prng;
+
+ cc_result = ccrng_pbkdf2_prng_init(&pbkdf2_prng, kBackupKeyMaxBytes,
+ CFDataGetLength(entropy), CFDataGetBytePtr(entropy),
+ sizeof(sBackupKeySalt), sBackupKeySalt,
+ kBackupKeyIterations);
+ require_action_quiet(cc_result == 0, exit, SOSErrorCreate(kSOSErrorProcessingFailure, error, NULL, CFSTR("pbkdf rng init failed: %d"), cc_result));
+
+ cc_result = ccec_compact_generate_key(cp, (struct ccrng_state *) &pbkdf2_prng, generatedKey);
+ require_action_quiet(cc_result == 0, exit, SOSErrorCreate(kSOSErrorProcessingFailure, error, NULL, CFSTR("Generate key failed: %d"), cc_result));
+
+ result = true;
+exit:
+ bzero(&pbkdf2_prng, sizeof(pbkdf2_prng));
+ return result;
+
+}
+
+CFDataRef SOSCopyDeviceBackupPublicKey(CFDataRef entropy, CFErrorRef *error)
+{
+ CFDataRef result = NULL;
+ CFMutableDataRef publicKeyData = NULL;
+
+ ccec_full_ctx_decl_cp(SOSGetBackupKeyCurveParameters(), fullKey);
+
+ require_quiet(SOSGenerateDeviceBackupFullKey(fullKey, SOSGetBackupKeyCurveParameters(), entropy, error), exit);
+
+ size_t space = ccec_compact_export_size(false, fullKey);
+ publicKeyData = CFDataCreateMutableWithScratch(kCFAllocatorDefault, space);
+ require_quiet(SecAllocationError(publicKeyData, error, CFSTR("Mutable data allocation")), exit);
+
+ ccec_compact_export(false, CFDataGetMutableBytePtr(publicKeyData), fullKey);
+
+ CFTransferRetained(result, publicKeyData);
+
+exit:
+ CFReleaseNull(publicKeyData);
+ return result;
+}
+
+
+CFDataRef SOSDateCreate(void) {
+ CFDateRef now = CFDateCreate(NULL, CFAbsoluteTimeGetCurrent());
+ size_t bufsiz = der_sizeof_date(now, NULL);
+ uint8_t buf[bufsiz];
+ der_encode_date(now, NULL, buf, buf+bufsiz);
+ CFReleaseNull(now);
+ return CFDataCreate(NULL, buf, bufsiz);
+}
+
projects / apple / security.git / blobdiff