#include "securityd_service.h"
#include "securityd_service_client.h"
#include <libaks.h>
#include <sandbox.h>
#include <xpc/xpc.h>
#include <xpc/private.h>
#include <dispatch/dispatch.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/codesign.h>
#include <os/log.h>
#include <stdio.h>
#include <errno.h>
#include <security_utilities/simulatecrash_assert.h>
#include <unistd.h>
#include <pwd.h>
#include <uuid/uuid.h>
#include <bsm/libbsm.h>
#include <copyfile.h>
#include <AssertMacros.h>
#include <Security/Security.h>
#include <Security/SecTask.h>
#include <Security/SecTaskPriv.h>
#include <Security/SecKeychainPriv.h>
#include <Security/SecInternalReleasePriv.h>
#include <MobileKeyBag/MobileKeyBag.h>
#include <corecrypto/ccsha2.h>
#include <corecrypto/cchmac.h>
#include <IOKit/IOKitLib.h>
#include <Kernel/IOKit/crypto/AppleFDEKeyStoreDefs.h>
#define LOG(...) os_log_debug(OS_LOG_DEFAULT, ##__VA_ARGS__);
static bool check_signature(xpc_connection_t connection);
static pid_t get_caller_pid(audit_token_t * token)
{
pid_t pid = 0;
if (token) {
audit_token_to_au32(*token, NULL, NULL, NULL, NULL, NULL, &pid, NULL, NULL);
}
return pid;
}
kern_return_t aks_register_for_notifications(mach_port_t server_port, uintptr_t message_id);
kern_return_t aks_stash_escrow(keybag_handle_t handle, bool create, const void * secret, int secret_len, const void * in_data, int in_data_len, void ** out_data, int * out_data_len);
const char * kb_home_path = "Library/Keychains";
const char * kb_user_bag = "user.kb";
const char * kb_stash_bag = "stash.kb";
#define HEXBUF_LEN 2048
typedef struct {
uid_t uid;
gid_t gid;
char * name;
char * home;
} service_user_record_t;
typedef enum {
kb_bag_type_user,
kb_bag_type_stash
} kb_bag_type_t;
static io_connect_t
openiodev(void)
{
io_registry_entry_t service;
io_connect_t conn;
kern_return_t kr;
service = IOServiceGetMatchingService(kIOMasterPortDefault, IOServiceMatching(kAppleFDEKeyStoreServiceName));
if (service == IO_OBJECT_NULL)
return IO_OBJECT_NULL;
kr = IOServiceOpen(service, mach_task_self(), 0, &conn);
if (kr != KERN_SUCCESS)
return IO_OBJECT_NULL;
kr = IOConnectCallMethod(conn, kAppleFDEKeyStoreUserClientOpen, NULL, 0, NULL, 0, NULL, NULL, NULL, NULL);
if (kr != KERN_SUCCESS) {
IOServiceClose(conn);
return IO_OBJECT_NULL;
}
return conn;
}
static void
closeiodev(io_connect_t conn)
{
kern_return_t kr;
kr = IOConnectCallMethod(conn, kAppleFDEKeyStoreUserClientClose, NULL, 0, NULL, 0, NULL, NULL, NULL, NULL);
if (kr != KERN_SUCCESS)
return;
IOServiceClose(conn);
}
static dispatch_queue_t
_kb_service_get_dispatch_queue()
{
static dispatch_once_t onceToken = 0;
static dispatch_queue_t connection_queue = NULL;
dispatch_once(&onceToken, ^{
connection_queue = dispatch_queue_create("kb-service-queue", DISPATCH_QUEUE_SERIAL);
});
return connection_queue;
}
static service_user_record_t * get_user_record(uid_t uid)
{
service_user_record_t * ur = NULL;
long bufsize = 0;
if ((bufsize = sysconf(_SC_GETPW_R_SIZE_MAX)) == -1) {
bufsize = 4096;
}
char *buf = calloc(1, (size_t)bufsize);
struct passwd pwbuf, *pw = NULL;
int rc;
if (((rc = getpwuid_r(uid, &pwbuf, buf, bufsize, &pw)) == 0) && pw != NULL) {
ur = calloc(1u, sizeof(service_user_record_t));
require(ur, done);
ur->uid = pw->pw_uid;
ur->gid = pw->pw_gid;
ur->home = strdup(pw->pw_dir);
ur->name = strdup(pw->pw_name);
} else {
os_log(OS_LOG_DEFAULT, "failed (%d) to lookup user record for uid: %d", rc, uid);
}
done:
free(buf);
return ur;
}
static void free_user_record(service_user_record_t * ur)
{
if (ur != NULL) {
if (ur->home) {
free(ur->home);
}
if (ur->name) {
free(ur->name);
}
free(ur);
}
}
static const char * get_host_uuid()
{
static uuid_string_t hostuuid = {};
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
struct timespec timeout = {30, 0};
uuid_t uuid = {};
if (gethostuuid(uuid, &timeout) == 0) {
uuid_unparse(uuid, hostuuid);
} else {
os_log(OS_LOG_DEFAULT, "failed to get host uuid");
onceToken = 0;
}
});
return hostuuid;
}
static uint64_t
compute_kcv(uint8_t * key, size_t key_len)
{
uint8_t hmac[CCSHA256_OUTPUT_SIZE] = { 0 };
uint8_t kcv_data[] = {0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01, 0x01};
cchmac(ccsha256_di(), key_len, key, sizeof(kcv_data), kcv_data, hmac);
return (uint64_t)(*(uint64_t *)hmac);
}
static char *
_kb_copy_bag_filename(service_user_record_t * ur, kb_bag_type_t type)
{
char * bag_file = NULL;
const char * name = NULL;
require(ur, done);
switch(type) {
case kb_bag_type_user:
name = kb_user_bag;
break;
case kb_bag_type_stash:
name = kb_stash_bag;
break;
default:
goto done;
}
bag_file = calloc(1u, PATH_MAX);
require(bag_file, done);
snprintf(bag_file, PATH_MAX, "%s/%s/%s/%s", ur->home, kb_home_path, get_host_uuid(), name);
done:
return bag_file;
}
static bool
_kb_verify_create_path(service_user_record_t * ur)
{
bool created = false;
struct stat st_info = {};
char new_path[PATH_MAX] = {};
char kb_path[PATH_MAX] = {};
snprintf(kb_path, sizeof(kb_path), "%s/%s/%s", ur->home, kb_home_path, get_host_uuid());
if (lstat(kb_path, &st_info) == 0) {
if (S_ISDIR(st_info.st_mode)) {
created = true;
} else {
os_log(OS_LOG_DEFAULT, "invalid directory at '%{public}s' moving aside", kb_path);
snprintf(new_path, sizeof(new_path), "%s-invalid", kb_path);
unlink(new_path);
if (rename(kb_path, new_path) != 0) {
os_log(OS_LOG_DEFAULT, "failed to rename file: %{public}s %{darwin.errno}d", kb_path, errno);
goto done;
}
}
}
if (!created) {
errno_t err = mkpath_np(kb_path, 0700);
require_action(err == 0 || err == EEXIST, done, os_log(OS_LOG_DEFAULT, "could not create path: %{public}s %{darwin.errno}d", kb_path, err));
created = true;
}
done:
if (!created) {
os_log(OS_LOG_DEFAULT, "_kb_verify_create_path failed %{public}s", kb_path);
}
return created;
}
static void
_set_thread_credentials(service_user_record_t * ur)
{
int rc = pthread_setugid_np(ur->uid, ur->gid);
if (rc) { os_log(OS_LOG_DEFAULT, "failed to set thread credential: %{darwin.errno}d", errno); }
rc = initgroups(ur->name, ur->gid);
if (rc) { os_log(OS_LOG_DEFAULT, "failed to initgroups: %i", rc); }
}
static void
_clear_thread_credentials()
{
int rc = pthread_setugid_np(KAUTH_UID_NONE, KAUTH_GID_NONE);
if (rc) { os_log(OS_LOG_DEFAULT, "failed to reset thread credential: %{darwin.errno}d", errno); }
}
static bool
_kb_bag_exists(service_user_record_t * ur, const char * bag_file)
{
bool exists = false;
struct stat st_info = {};
char new_file[PATH_MAX] = {};
require(ur, done);
_set_thread_credentials(ur);
if (lstat(bag_file, &st_info) == 0) {
if (S_ISREG(st_info.st_mode)) {
exists = true;
} else {
os_log(OS_LOG_DEFAULT, "invalid file at '%{public}s' moving aside", bag_file);
snprintf(new_file, sizeof(new_file), "%s-invalid", bag_file);
unlink(new_file);
if (rename(bag_file, new_file) != 0) {
os_log(OS_LOG_DEFAULT, "failed to rename file: %{public}s %{darwin.errno}d", bag_file, errno);
}
}
}
done:
_clear_thread_credentials();
return exists;
}
static bool
_kb_save_bag_to_disk(service_user_record_t * ur, const char * bag_file, void * data, size_t length, uint64_t * kcv)
{
bool result = false;
char tmp_bag[PATH_MAX];
int fd = -1;
require(bag_file, done);
_set_thread_credentials(ur);
require(_kb_verify_create_path(ur), done);
require_action(snprintf(tmp_bag, sizeof(tmp_bag), "%s.tmp", bag_file) < sizeof(tmp_bag), done, os_log(OS_LOG_DEFAULT, "path too large"));
fd = open(tmp_bag, O_CREAT | O_TRUNC | O_WRONLY | O_NOFOLLOW, 0600);
require_action(fd != -1, done, os_log(OS_LOG_DEFAULT, "could not create file: %{public}s %{darwin.errno}d", tmp_bag, errno));
require_action(write(fd, data, length) == length, done, os_log(OS_LOG_DEFAULT, "failed to write keybag to disk %s %{darwin.errno}d", tmp_bag, errno));
if (renamex_np(tmp_bag, bag_file, RENAME_SWAP) != 0) {
os_log(OS_LOG_DEFAULT, "Warning: atomic swap failed, error= %{darwin.errno}d", errno);
require_noerr_action(rename(tmp_bag, bag_file), done, os_log(OS_LOG_DEFAULT, "could not save keybag file, error= %{darwin.errno}d", errno));
} else {
(void)unlink(tmp_bag);
}
*kcv = compute_kcv(data, length);
result = true;
done:
if (fd != -1) { close(fd); }
_clear_thread_credentials();
return result;
}
static bool
_kb_load_bag_from_disk(service_user_record_t * ur, const char * bag_file, uint8_t ** data, size_t * length, uint64_t * kcv)
{
bool result = false;
int fd = -1;
uint8_t * buf = NULL;
size_t buf_size = 0;
struct stat st_info = {};
require(bag_file, done);
_set_thread_credentials(ur);
require(_kb_verify_create_path(ur), done);
require_action_quiet(lstat(bag_file, &st_info) == 0, done, os_log(OS_LOG_DEFAULT, "failed to stat file: %{public}s %{darwin.errno}d", bag_file, errno));
require_action(S_ISREG(st_info.st_mode), done, os_log(OS_LOG_DEFAULT, "failed to load, not a file: %{public}s", bag_file));
buf_size = (size_t)st_info.st_size;
fd = open(bag_file, O_RDONLY | O_NOFOLLOW);
require_action(fd != -1, done, os_log(OS_LOG_DEFAULT, "could not open file: %{public}s %{darwin.errno}d", bag_file, errno));
buf = (uint8_t *)calloc(1u, buf_size);
require(buf != NULL, done);
require(read(fd, buf, buf_size) == buf_size, done);
*kcv = compute_kcv(buf, buf_size);
*data = buf;
*length = buf_size;
buf = NULL;
result = true;
done:
if (fd != -1) { close(fd); }
if (buf) { free(buf); }
_clear_thread_credentials();
return result;
}
static void
_kb_invalidate_bag(service_user_record_t *ur, const char * bag_file, uint64_t * kcv)
{
uint8_t *buf = NULL;
size_t buf_size = 0;
require(ur, out);
if (_kb_load_bag_from_disk(ur, bag_file, &buf, &buf_size, kcv)) {
require_action(buf && buf_size <= INT_MAX, out, os_log(OS_LOG_DEFAULT, "failed to read: %{public}s", bag_file));
require_noerr_action(aks_invalidate_bag(buf, (int)buf_size), out, os_log(OS_LOG_DEFAULT, "failed to invalidate file: %{public}s", bag_file));
} else {
os_log(OS_LOG_DEFAULT, "failed to read file: %{public}s", bag_file);
}
out:
free(buf);
}
static void
_kb_rename_bag_on_disk(service_user_record_t * ur, const char * bag_file, uint64_t * kcv)
{
char new_file[PATH_MAX] = {};
if (bag_file) {
_set_thread_credentials(ur);
snprintf(new_file, sizeof(new_file), "%s-invalid", bag_file);
unlink(new_file);
rename(bag_file, new_file);
_kb_invalidate_bag(ur, new_file, kcv);
_clear_thread_credentials();
}
}
static void
_kb_delete_bag_on_disk(service_user_record_t * ur, const char * bag_file, uint64_t * kcv)
{
if (bag_file) {
_set_thread_credentials(ur);
_kb_invalidate_bag(ur, bag_file, kcv);
unlink(bag_file);
_clear_thread_credentials();
}
}
static int service_kb_load(service_context_t *context);
static int service_kb_load_uid(uid_t s_uid, uint64_t * kcv);
static int
_service_kb_set_system(keybag_handle_t handle, keybag_handle_t special_handle)
{
return aks_set_system(handle, (special_handle == 0) ? AKS_MACOS_ROOT_HANDLE : special_handle);
}
static int
_service_kb_get_system(keybag_handle_t special_handle, keybag_handle_t * handle_out)
{
return aks_get_system((special_handle == 0) ? AKS_MACOS_ROOT_HANDLE : special_handle, handle_out);
}
static int
_kb_get_session_handle(service_context_t * context, keybag_handle_t * handle_out)
{
int rc = KB_BagNotLoaded;
require_noerr_quiet(_service_kb_get_system(context->s_uid, handle_out), done);
rc = KB_Success;
done:
if (rc == KB_BagNotLoaded) {
if (service_kb_load(context) == KB_Success) {
if (_service_kb_get_system(context->s_uid, handle_out) == kAKSReturnSuccess) {
rc = KB_Success;
}
}
}
return rc;
}
static void update_keybag_handle(keybag_handle_t handle)
{
dispatch_sync(_kb_service_get_dispatch_queue(), ^{
uid_t uid = (handle == (-AKS_MACOS_ROOT_HANDLE)) ? 0 : abs(handle);
uint8_t * buf = NULL;
size_t buf_size = 0;
service_user_record_t * ur = NULL;
char * bag_file = NULL;
uint64_t kcv = 0;
require_noerr(aks_save_bag(handle, (void**)&buf, (int*)&buf_size), done);
require(ur = get_user_record(uid), done);
require(bag_file = _kb_copy_bag_filename(ur, kb_bag_type_user), done);
require(_kb_save_bag_to_disk(ur, bag_file, buf, buf_size, &kcv), done);
os_log(OS_LOG_DEFAULT, "successfully updated handle %d, save keybag kcv: 0x%0llx", handle, kcv);
done:
if (buf) free(buf);
if (ur) free_user_record(ur);
if (bag_file) free(bag_file);
});
}
static int
_kb_get_options_for_uid(uid_t uid, CFMutableDictionaryRef *options_out)
{
int result = KB_GeneralError;
CFMutableDictionaryRef options = NULL;
CFNumberRef cf_uid = NULL;
require(options_out, out);
require(options = CFDictionaryCreateMutable(kCFAllocatorDefault, 0, &kCFTypeDictionaryKeyCallBacks, &kCFTypeDictionaryValueCallBacks), out);
require(cf_uid = CFNumberCreate(kCFAllocatorDefault, kCFNumberIntType, &uid), out);
CFDictionaryAddValue(options, kKeyBagDeviceHandle, cf_uid);
*options_out = options;
options = NULL;
result = KB_Success;
out:
if (options) { CFRelease(options); }
if (cf_uid) { CFRelease(cf_uid); }
return result;
}
static int
_kb_set_properties(service_context_t * context, const void * secret, int secret_len)
{
int result = KB_GeneralError;
CFMutableDictionaryRef options = NULL;
CFDataRef passcode = NULL;
require_noerr(_kb_get_options_for_uid(context->s_uid, &options), done);
passcode = CFDataCreateWithBytesNoCopy(kCFAllocatorDefault, secret, secret_len, kCFAllocatorNull);
if (MKBKeyBagSetUserUUID(options, passcode)) {
os_log(OS_LOG_DEFAULT, "set user uuid failed");
}
#ifdef MKB_SUPPORTS_BIND_KEK
if (MKBKeyBagBindKEK(options, passcode)) {
os_log(OS_LOG_DEFAULT, "KEK bind failed");
}
#else
os_log(OS_LOG_DEFAULT, "Not bindinig KEK, update SDK");
#endif
result = KB_Success;
done:
if (options) { CFRelease(options); }
if (passcode) { CFRelease(passcode); }
return result;
}
static int
service_kb_create(service_context_t * context, const void * secret, int secret_len)
{
__block int rc = KB_GeneralError;
dispatch_sync(_kb_service_get_dispatch_queue(), ^{
uint8_t * buf = NULL;
size_t buf_size = 0;
keybag_handle_t private_handle = bad_keybag_handle, session_handle = bad_keybag_handle;
service_user_record_t * ur = get_user_record(context->s_uid);
char * bag_file = _kb_copy_bag_filename(ur, kb_bag_type_user);
require(bag_file, done);
require_action(!_kb_bag_exists(ur, bag_file), done, rc = KB_BagExists);
require_noerr(rc = aks_create_bag(secret, secret_len, kAppleKeyStoreDeviceBag, &private_handle), done);
require_noerr(rc = aks_save_bag(private_handle, (void**)&buf, (int*)&buf_size), done);
require_action(_kb_save_bag_to_disk(ur, bag_file, buf, buf_size, &context->kcv), done, rc = KB_BagError);
require_noerr(rc = _service_kb_set_system(private_handle, context->s_uid), done);
require_noerr(rc = _kb_get_session_handle(context, &session_handle), done);
if (secret && rc == KB_Success) {
aks_unlock_bag(session_handle, secret, secret_len);
}
if (rc == KB_Success) {
_kb_set_properties(context, secret, secret_len);
}
done:
if (private_handle != bad_keybag_handle) {
aks_unload_bag(private_handle);
}
if (buf) free(buf);
if (bag_file) { free(bag_file); }
if (ur) free_user_record(ur);
});
return rc;
}
static int
_service_kb_load_uid(uid_t s_uid, uint64_t * kcv)
{
__block int rc = KB_GeneralError;
dispatch_sync(_kb_service_get_dispatch_queue(), ^{
uint8_t * buf = NULL;
size_t buf_size = 0;
keybag_handle_t private_handle = bad_keybag_handle, session_handle = bad_keybag_handle;
service_user_record_t * ur = NULL;
char * bag_file = NULL;
int _stage = 0;
rc = _service_kb_get_system(s_uid, &session_handle);
if (rc == kAKSReturnNotFound) {
require_action(ur = get_user_record(s_uid), done, rc = KB_GeneralError; _stage = 1);
require_action(bag_file = _kb_copy_bag_filename(ur, kb_bag_type_user), done, rc = KB_GeneralError; _stage = 2);
require_action_quiet(_kb_load_bag_from_disk(ur, bag_file, &buf, &buf_size, kcv), done, rc = KB_BagNotFound; _stage = 3);
rc = aks_load_bag(buf, (int)buf_size, &private_handle);
switch (rc) {
case kAKSReturnBadDeviceKey:
case kAKSReturnBadSignature:
case kAKSReturnDecodeError:
case kAKSReturnPolicyInvalid:
os_log(OS_LOG_DEFAULT, "bag load failed 0x%x for uid (%i), discarding", rc, s_uid);
_kb_rename_bag_on_disk(ur, bag_file, kcv);
rc = KB_BagNotFound;
break;
case kAKSReturnSuccess:
break;
default:
os_log(OS_LOG_DEFAULT, "bag load failed 0x%x for uid (%i)", rc, s_uid);
break;
}
require_noerr_action(rc, done, _stage = 4);
require_noerr_action(rc = _service_kb_set_system(private_handle, s_uid), done, _stage = 5);
}
require(rc == KB_Success, done);
done:
if (private_handle != bad_keybag_handle) {
aks_unload_bag(private_handle);
}
if (rc != KB_Success) {
os_log(OS_LOG_DEFAULT, "%d: error %d loading keybag for uid (%i) at path: %{public}s", _stage, rc, s_uid, bag_file);
}
if (buf) free(buf);
if (ur) free_user_record(ur);
if (bag_file) free(bag_file);
});
return rc;
}
static int
service_kb_load_uid(uid_t s_uid, uint64_t * kcv)
{
return _service_kb_load_uid(s_uid, kcv);
}
static int
service_kb_load(service_context_t * context)
{
return _service_kb_load_uid(context->s_uid, &context->kcv);
}
static int
service_kb_unload(service_context_t *context)
{
__block int rc = KB_GeneralError;
dispatch_sync(_kb_service_get_dispatch_queue(), ^{
keybag_handle_t session_handle = bad_keybag_handle;
rc = _service_kb_get_system(context->s_uid, &session_handle);
if (rc == kAKSReturnNotFound) {
rc = KB_Success;
return;
} else if (rc != kAKSReturnSuccess) {
os_log(OS_LOG_DEFAULT, "error locating session keybag for uid (%i) in session (%i)", context->s_uid, context->s_id);
rc = KB_BagError;
return;
}
rc = aks_unload_bag(session_handle);
if (rc != kAKSReturnSuccess) {
os_log(OS_LOG_DEFAULT, "error unloading keybag for uid (%i) in session (%i)", context->s_uid, context->s_id);
rc = KB_BagError;
} else {
os_log(OS_LOG_DEFAULT, "successfully unloaded keybag (%ld) for uid (%i) in session (%i)", (long)session_handle, context->s_uid, context->s_id);
}
});
return rc;
}
static int
service_kb_save(service_context_t * context)
{
__block int rc = KB_GeneralError;
keybag_handle_t session_handle;
require_noerr(rc = _kb_get_session_handle(context, &session_handle), done);
dispatch_sync(_kb_service_get_dispatch_queue(), ^{
uint8_t * buf = NULL;
size_t buf_size = 0;
service_user_record_t * ur = NULL;
char * bag_file = NULL;
require_noerr(rc = aks_save_bag(session_handle, (void**)&buf, (int*)&buf_size), done);
require_action(ur = get_user_record(context->s_uid), done, rc = KB_GeneralError);
require_action(bag_file = _kb_copy_bag_filename(ur, kb_bag_type_user), done, rc = KB_GeneralError);
require_action(_kb_save_bag_to_disk(ur, bag_file, buf, buf_size, &context->kcv), done, rc = KB_BagError);
rc = KB_Success;
done:
if (buf) free(buf);
if (ur) free_user_record(ur);
if (bag_file) free(bag_file);
return;
});
done:
return rc;
}
static int
service_kb_unlock(service_context_t * context, const void * secret, int secret_len)
{
int rc = KB_GeneralError;
keybag_handle_t session_handle;
CFDataRef passcode = NULL;
CFMutableDictionaryRef options = NULL;
require_noerr(_kb_get_options_for_uid(context->s_uid, &options), done);
require_noerr(rc = _kb_get_session_handle(context, &session_handle), done);
require(passcode = CFDataCreateWithBytesNoCopy(NULL, secret, secret_len, kCFAllocatorNull), done);
rc = MKBUnlockDevice(passcode, options);
os_log_info(OS_LOG_DEFAULT, "MKBUnlockDevice result: (%ld), caller pid: %d", (long)rc, get_caller_pid(&context->procToken));
done:
if (options) { CFRelease(options); }
if (passcode) { CFRelease(passcode); }
return rc;
}
static int
service_kb_lock(service_context_t * context)
{
return -1;
}
static int
service_kb_change_secret(service_context_t * context, const void * secret, int secret_len, const void * new_secret, int new_secret_len)
{
__block int rc = KB_GeneralError;
keybag_handle_t session_handle;
require_noerr(rc = _kb_get_session_handle(context, &session_handle), done);
dispatch_sync(_kb_service_get_dispatch_queue(), ^{
uint8_t * buf = NULL;
size_t buf_size = 0;
service_user_record_t * ur = NULL;
char * bag_file = NULL;
require_noerr(rc = aks_change_secret(session_handle, secret, secret_len, new_secret, new_secret_len, generation_noop, NULL), done);
require_noerr(rc = aks_save_bag(session_handle, (void**)&buf, (int*)&buf_size), done);
require_action(ur = get_user_record(context->s_uid), done, rc = KB_GeneralError);
require_action(bag_file = _kb_copy_bag_filename(ur, kb_bag_type_user), done, rc = KB_GeneralError);
require_action(_kb_save_bag_to_disk(ur, bag_file, buf, buf_size, &context->kcv), done, rc = KB_BagError);
rc = KB_Success;
done:
if (buf) free(buf);
if (ur) free_user_record(ur);
if (bag_file) free(bag_file);
return;
});
done:
return rc;
}
static int
service_kb_reset(service_context_t * context, const void * secret, int secret_len)
{
__block int rc = KB_GeneralError;
service_user_record_t * ur = NULL;
char * bag_file = NULL;
require_action(ur = get_user_record(context->s_uid), done, rc = KB_GeneralError);
require_action(bag_file = _kb_copy_bag_filename(ur, kb_bag_type_user), done, rc = KB_GeneralError);
dispatch_sync(_kb_service_get_dispatch_queue(), ^{
uint8_t * buf = NULL;
size_t buf_size = 0;
keybag_handle_t private_handle = bad_keybag_handle, session_handle = bad_keybag_handle;
os_log(OS_LOG_DEFAULT, "resetting keybag for uid (%i) in session (%i)", context->s_uid, context->s_id);
_kb_rename_bag_on_disk(ur, bag_file, &context->kcv);
require_noerr(rc = aks_create_bag(secret, secret_len, kAppleKeyStoreDeviceBag, &private_handle), done);
require_noerr(rc = aks_save_bag(private_handle, (void**)&buf, (int*)&buf_size), done);
require_action(_kb_save_bag_to_disk(ur, bag_file, buf, buf_size, &context->kcv), done, rc = KB_BagError);
require_noerr(rc = _service_kb_set_system(private_handle, context->s_uid), done);
require_noerr(rc = _kb_get_session_handle(context, &session_handle), done);
if (secret && rc == KB_Success) {
aks_unlock_bag(session_handle, secret, secret_len);
}
if (rc == KB_Success) {
_kb_set_properties(context, secret, secret_len);
}
done:
if (private_handle != bad_keybag_handle) {
aks_unload_bag(private_handle);
}
if (buf) free(buf);
return;
});
done:
if (ur) free_user_record(ur);
if (bag_file) free(bag_file);
return rc;
}
static int
service_kb_is_locked(service_context_t * context, xpc_object_t reply)
{
int rc = KB_GeneralError;
keybag_state_t state;
keybag_handle_t session_handle;
require_noerr(rc = _kb_get_session_handle(context, &session_handle), done);
require_noerr(rc = aks_get_lock_state(session_handle, &state), done);
xpc_dictionary_set_bool(reply, SERVICE_XPC_LOCKED, state & keybag_state_locked);
xpc_dictionary_set_bool(reply, SERVICE_XPC_NO_PIN, state & keybag_state_no_pin);
done:
return rc;
}
static int
service_kb_wrap_key(service_context_t *context, xpc_object_t event, xpc_object_t reply)
{
int rc = KB_GeneralError;
size_t sz;
const void *key;
int key_size;
keyclass_t key_class;
keybag_handle_t session_handle;
void *wrapped_key = NULL;
int wrapped_key_size;
keyclass_t wrapped_key_class;
require_noerr(rc = _kb_get_session_handle(context, &session_handle), done);
key = xpc_dictionary_get_data(event, SERVICE_XPC_KEY, &sz);
require_action(key != NULL, done, rc = KB_GeneralError);
require_action(sz <= APPLE_KEYSTORE_MAX_KEY_LEN, done, rc = KB_GeneralError);
key_size = (int)sz;
key_class = (keyclass_t)xpc_dictionary_get_int64(event, SERVICE_XPC_KEYCLASS);
wrapped_key_size = APPLE_KEYSTORE_MAX_ASYM_WRAPPED_KEY_LEN;
wrapped_key = calloc(1, wrapped_key_size);
rc = aks_wrap_key(key, key_size, key_class, session_handle, wrapped_key, &wrapped_key_size, &wrapped_key_class);
if (rc == KB_Success) {
xpc_dictionary_set_data(reply, SERVICE_XPC_WRAPPED_KEY, wrapped_key, wrapped_key_size);
xpc_dictionary_set_int64(reply, SERVICE_XPC_KEYCLASS, wrapped_key_class);
}
done:
free(wrapped_key);
return rc;
}
static int
service_kb_unwrap_key(service_context_t *context, xpc_object_t event, xpc_object_t reply)
{
int rc = KB_GeneralError;
size_t sz;
const void *wrapped_key;
int wrapped_key_size;
keyclass_t wrapped_key_class;
keybag_handle_t session_handle;
void *key = NULL;
int key_size;
require_noerr(rc = _kb_get_session_handle(context, &session_handle), done);
wrapped_key = xpc_dictionary_get_data(event, SERVICE_XPC_WRAPPED_KEY, &sz);
require_action(wrapped_key != NULL, done, rc = KB_GeneralError);
require_action(sz <= APPLE_KEYSTORE_MAX_ASYM_WRAPPED_KEY_LEN, done, rc = KB_GeneralError);
wrapped_key_size = (int)sz;
wrapped_key_class = (keyclass_t)xpc_dictionary_get_int64(event, SERVICE_XPC_KEYCLASS);
key_size = APPLE_KEYSTORE_MAX_KEY_LEN;
key = calloc(1, key_size);
rc = aks_unwrap_key(wrapped_key, wrapped_key_size, wrapped_key_class, session_handle, key, &key_size);
if (rc == KB_Success) {
xpc_dictionary_set_data(reply, SERVICE_XPC_KEY, key, key_size);
}
done:
free(key);
return rc;
}
static int
service_kb_stash_create(service_context_t * context, const void * key, unsigned key_size)
{
int rc = KB_GeneralError;
char * bag_file = NULL;
keybag_handle_t session_handle;
service_user_record_t * ur = NULL;
void * stashbag = NULL;
int stashbag_size = 0;
__block bool saved = false;
require(key, done);
require_noerr(rc = _kb_get_session_handle(context, &session_handle), done);
require_action(ur = get_user_record(context->s_uid), done, rc = KB_GeneralError);
require_noerr(rc = aks_stash_escrow(session_handle, true, key, key_size, NULL, 0, (void**)&stashbag, &stashbag_size), done);
require_action(bag_file = _kb_copy_bag_filename(ur, kb_bag_type_stash), done, rc = KB_GeneralError);
dispatch_sync(_kb_service_get_dispatch_queue(), ^{
saved = _kb_save_bag_to_disk(ur, bag_file, stashbag, stashbag_size, &context->kcv);
});
require_action(saved, done, rc = KB_BagError);
rc = KB_Success;
done:
if (stashbag) { free(stashbag); }
if (bag_file) { free(bag_file); }
if (ur) free_user_record(ur);
return rc;
}
static int
service_kb_stash_load(service_context_t * context, const void * key, unsigned key_size, bool nondestructive)
{
__block int rc = KB_GeneralError;
char * bag_file = NULL;
keybag_handle_t session_handle;
service_user_record_t * ur = NULL;
__block uint8_t * stashbag = NULL;
__block size_t stashbag_size = 0;
require(key, done);
require_noerr(rc = _kb_get_session_handle(context, &session_handle), done);
require_action(ur = get_user_record(context->s_uid), done, rc = KB_GeneralError);
require_action(bag_file = _kb_copy_bag_filename(ur, kb_bag_type_stash), done, rc = KB_GeneralError);
dispatch_sync(_kb_service_get_dispatch_queue(), ^{
if (!_kb_load_bag_from_disk(ur, bag_file, &stashbag, &stashbag_size, &context->kcv)) {
rc = KB_BagError;
}
});
require_noerr(rc, done);
require_noerr(rc = aks_stash_escrow(session_handle, false, key, key_size, stashbag, (int)stashbag_size, NULL, NULL), done);
rc = KB_Success;
done:
if (stashbag) { free(stashbag); }
if ((bag_file) && (!nondestructive)) {
_kb_delete_bag_on_disk(ur, bag_file, &context->kcv);
free(bag_file);
}
if (ur) free_user_record(ur);
return rc;
}
OSStatus service_stash_get_key(service_context_t * context, xpc_object_t event, xpc_object_t reply)
{
getStashKey_InStruct_t inStruct;
getStashKey_OutStruct_t outStruct;
size_t outSize = sizeof(outStruct);
kern_return_t kr = KERN_INVALID_ARGUMENT;
io_connect_t conn = openiodev();
require(conn, done);
inStruct.type = kAppleFDEKeyStoreStash_master;
kr = IOConnectCallMethod(conn, kAppleFDEKeyStore_getStashKey,
NULL, 0,
&inStruct, sizeof(inStruct),
NULL, NULL,
&outStruct, &outSize);
if (kr == KERN_SUCCESS) {
xpc_dictionary_set_data(reply, SERVICE_XPC_KEY, outStruct.outBuf.key.key, outStruct.outBuf.key.keysize);
service_kb_stash_load(context, outStruct.outBuf.key.key, outStruct.outBuf.key.keysize, false);
} else {
os_log(OS_LOG_DEFAULT, "failed to get stash key: %d", (int)kr);
}
done:
if (conn)
closeiodev(conn);
return kr;
}
OSStatus service_stash_set_key(service_context_t * context, xpc_object_t event, xpc_object_t reply)
{
kern_return_t kr = KERN_INVALID_ARGUMENT;
io_connect_t conn = IO_OBJECT_NULL;
size_t keydata_len = 0;
size_t len;
keybag_state_t state;
keybag_handle_t session_handle;
require_noerr(_kb_get_session_handle(context, &session_handle), done);
require_noerr(aks_get_lock_state(session_handle, &state), done);
require_action(!(state & keybag_lock_locked), done, kr = CSSMERR_CSP_OS_ACCESS_DENIED; LOG("stash failed keybag locked"));
conn = openiodev();
require(conn, done);
setKeyGetUUID_InStruct_t inStruct1;
uuid_OutStruct_t outStruct1;
const uint8_t *keydata = xpc_dictionary_get_data(event, SERVICE_XPC_KEY, &keydata_len);
require(keydata, done);
require(keydata_len <= MAX_KEY_SIZE, done);
_Static_assert(sizeof(inStruct1.inKey.key.key) == MAX_KEY_SIZE, "unexpected aks raw key size");
memcpy(&inStruct1.inKey.key.key, keydata, keydata_len);
inStruct1.inKey.key.keysize = (cryptosize_t) keydata_len;
len = sizeof(outStruct1);
kr = IOConnectCallMethod(conn, kAppleFDEKeyStore_setKeyGetUUID,
NULL, 0,
&inStruct1, sizeof(inStruct1),
NULL, NULL,
&outStruct1, &len);
require(kr == KERN_SUCCESS, done);
setStashKey_InStruct_t inStruct2;
_Static_assert(sizeof(outStruct1.uuid) == sizeof(inStruct2.uuid), "invalid uuid size(s)");
memcpy(&inStruct2.uuid, &outStruct1.uuid, sizeof(outStruct1.uuid));
inStruct2.type = kAppleFDEKeyStoreStash_master;
kr = IOConnectCallMethod(conn, kAppleFDEKeyStore_setStashKey,
NULL, 0,
&inStruct2, sizeof(inStruct2),
NULL, NULL,
NULL, NULL);
if (kr == KERN_SUCCESS) {
service_kb_stash_create(context, keydata, (unsigned)keydata_len);
}
done:
os_log(OS_LOG_DEFAULT, "set stashkey %d", (int)kr);
if (conn)
closeiodev(conn);
return kr;
}
OSStatus service_stash_load_key(service_context_t * context, xpc_object_t event, xpc_object_t reply)
{
kern_return_t kr = KERN_SUCCESS;
size_t keydata_len = 0;
const uint8_t *keydata = xpc_dictionary_get_data(event, SERVICE_XPC_KEY, &keydata_len);
require(keydata, done);
kr = service_kb_stash_load(context, keydata, (cryptosize_t) keydata_len, true);
done:
return kr;
}
#if DEBUG
OSStatus service_stash_blob(xpc_object_t event, xpc_object_t reply)
{
kern_return_t kr = KERN_INVALID_ARGUMENT;
io_connect_t conn = openiodev();
require(conn, done);
kr = IOConnectCallMethod(conn, kAppleFDEKeyStore_commitStash,
NULL, 0,
NULL, 0,
NULL, NULL,
NULL, NULL);
done:
if (conn)
closeiodev(conn);
return kr;
}
#endif
bool peer_has_entitlement(xpc_connection_t peer, const char * entitlement)
{
bool entitled = false;
xpc_object_t value = xpc_connection_copy_entitlement_value(peer, entitlement);
if (value && (xpc_get_type(value) == XPC_TYPE_BOOL)) {
entitled = xpc_bool_get_value(value);
}
if (value) xpc_release(value);
return entitled;
}
static char * sel_to_char(uint64_t sel)
{
switch (sel) {
case SERVICE_STASH_SET_KEY:
return "set_key";
case SERVICE_STASH_GET_KEY:
return "get_key";
case SERVICE_STASH_BLOB:
return "stash_blob";
case SERVICE_KB_LOAD:
return "kb_load";
case SERVICE_KB_SAVE:
return "kb_save";
case SERVICE_KB_UNLOCK:
return "kb_unlock";
case SERVICE_KB_LOCK:
return "kb_lock";
case SERVICE_KB_CHANGE_SECRET:
return "kb_change_secret";
case SERVICE_KB_CREATE:
return "kb_create";
case SERVICE_KB_IS_LOCKED:
return "kb_is_locked";
case SERVICE_KB_RESET:
return "kb_reset";
case SERVICE_KB_UNLOAD:
return "kb_unload";
case SERVICE_KB_LOAD_UID:
return "kb_load_uid";
case SERVICE_KB_WRAP_KEY:
return "kb_wrap_key";
case SERVICE_KB_UNWRAP_KEY:
return "kb_unwrap_key";
default:
return "unknown";
}
}
static char * err_to_char(int err)
{
switch (err) {
case KB_Success:
return "success";
case KB_GeneralError:
return "general error";
case KB_BagNotFound:
return "bag not found";
case KB_BagError:
return "bag error";
case KB_BagNotLoaded:
return "bag not loaded";
case KB_BagExists:
return "bag exists";
case KB_InvalidSession:
return "invalid session";
default:
return "";
}
}
static bool log_kcv(uint64_t request)
{
if ((request == SERVICE_KB_CREATE) ||
(request == SERVICE_KB_LOAD) ||
(request == SERVICE_KB_SAVE) ||
(request == SERVICE_KB_UNLOCK) ||
(request == SERVICE_KB_CHANGE_SECRET) ||
(request == SERVICE_KB_RESET) ||
(request == SERVICE_KB_IS_LOCKED) ||
(request == SERVICE_STASH_GET_KEY) ||
(request == SERVICE_STASH_SET_KEY) ||
(request == SERVICE_STASH_LOAD_KEY) ||
(request == SERVICE_KB_LOAD_UID) ||
(request == SERVICE_KB_WRAP_KEY) ||
(request == SERVICE_KB_UNWRAP_KEY)) {
return true;
}
return false;
}
void service_peer_event_handler(xpc_connection_t connection, xpc_object_t event)
{
xpc_type_t type = xpc_get_type(event);
uid_t uid;
if (type == XPC_TYPE_ERROR) {
if (event == XPC_ERROR_CONNECTION_INVALID) {
}
} else {
assert(type == XPC_TYPE_DICTIONARY);
int rc = KB_GeneralError;
uint64_t request = 0;
const uint8_t * secret = NULL, * new_secret = NULL;
size_t secret_len = 0, new_secret_len = 0, data_len = 0;
service_context_t * context = NULL;
bool free_context = false;
const void * data;
const char *entitlement;
xpc_object_t reply = xpc_dictionary_create_reply(event);
request = xpc_dictionary_get_uint64(event, SERVICE_XPC_REQUEST);
if (request == SERVICE_KB_UNLOAD || request == SERVICE_KB_LOAD_UID) {
switch (request) {
case SERVICE_KB_UNLOAD:
entitlement = "com.apple.private.securityd.keybag-unload";
break;
case SERVICE_KB_LOAD_UID:
entitlement = "com.apple.private.securityd.keybag-load";
break;
}
if (!peer_has_entitlement(connection, entitlement) && !peer_has_entitlement(connection, "com.apple.keystore.device")) {
xpc_connection_cancel(connection);
return;
}
} else {
if (xpc_connection_get_euid(connection) != 0) {
xpc_connection_cancel(connection);
return;
}
if (!check_signature(connection)) {
xpc_connection_cancel(connection);
return;
}
}
data = xpc_dictionary_get_data(event, SERVICE_XPC_CONTEXT, &data_len);
require_action(data || request == SERVICE_KB_UNLOAD || request == SERVICE_KB_LOAD_UID, done, rc = KB_GeneralError);
if (data) {
require(data_len == sizeof(service_context_t), done);
context = (service_context_t*)data;
} else {
audit_token_t audit_token = { 0 };
xpc_connection_get_audit_token(connection, &audit_token);
context = calloc(1, sizeof(service_context_t));
context->s_id = xpc_connection_get_asid(connection);
context->s_uid = xpc_connection_get_euid(connection);
context->procToken = audit_token;
free_context = true;
}
context->kcv = 0;
require_action(context->s_id != AU_DEFAUDITSID, done, rc = KB_InvalidSession);
require_action(context->s_uid != AU_DEFAUDITID, done, rc = KB_InvalidSession);
switch (request) {
case SERVICE_KB_CREATE:
secret = xpc_dictionary_get_data(event, SERVICE_XPC_SECRET, &secret_len);
rc = service_kb_create(context, secret, (int)secret_len);
break;
case SERVICE_KB_LOAD:
rc = service_kb_load(context);
break;
case SERVICE_KB_UNLOAD:
rc = service_kb_unload(context);
break;
case SERVICE_KB_SAVE:
rc = service_kb_save(context);
break;
case SERVICE_KB_UNLOCK:
secret = xpc_dictionary_get_data(event, SERVICE_XPC_SECRET, &secret_len);
rc = service_kb_unlock(context, secret, (int)secret_len);
break;
case SERVICE_KB_LOCK:
rc = service_kb_lock(context);
break;
case SERVICE_KB_CHANGE_SECRET:
secret = xpc_dictionary_get_data(event, SERVICE_XPC_SECRET, &secret_len);
new_secret = xpc_dictionary_get_data(event, SERVICE_XPC_SECRET_NEW, &new_secret_len);
rc = service_kb_change_secret(context, secret, (int)secret_len, new_secret, (int)new_secret_len);
break;
case SERVICE_KB_RESET:
secret = xpc_dictionary_get_data(event, SERVICE_XPC_SECRET, &secret_len);
rc = service_kb_reset(context, secret, (int)secret_len);
break;
case SERVICE_KB_IS_LOCKED:
rc = service_kb_is_locked(context, reply);
break;
case SERVICE_STASH_GET_KEY:
rc = service_stash_get_key(context, event, reply);
break;
case SERVICE_STASH_SET_KEY:
rc = service_stash_set_key(context, event, reply);
break;
case SERVICE_STASH_LOAD_KEY:
rc = service_stash_load_key(context, event, reply);
break;
case SERVICE_KB_LOAD_UID:
uid = (uid_t)xpc_dictionary_get_uint64(event, SERVICE_XPC_UID);
rc = service_kb_load_uid(uid, &context->kcv);
break;
case SERVICE_KB_WRAP_KEY:
rc = service_kb_wrap_key(context, event, reply);
break;
case SERVICE_KB_UNWRAP_KEY:
rc = service_kb_unwrap_key(context, event, reply);
break;
#if DEBUG
case SERVICE_STASH_BLOB:
rc = service_stash_blob(event, reply);
break;
#endif
default:
LOG("unknown service type");
break;
}
done:
{
char log[200] = { 0 };
int count = snprintf(log, sizeof(log), "selector: %s (%llu), error: %s (%x), sid: %d, suid: %d, pid: %d", sel_to_char(request), request, err_to_char(rc), rc, context ? context->s_id : 0, context ? context->s_uid : 0, context ? get_caller_pid(&context->procToken) : 0);
if (log_kcv(request) && (count < sizeof(log) - 1) && (count > 0) && (context) && (context->kcv > 0)) {
count = snprintf(log + count, sizeof(log) - count, ", kcv: 0x%0llx", context->kcv);
}
if (count > 0) {
#if DEBUG
LOG("%{public}s", log);
#else
if ((rc != 0) || log_kcv(request)) {
os_log(OS_LOG_DEFAULT, "%{public}s", log);
}
#endif
}
}
xpc_dictionary_set_int64(reply, SERVICE_XPC_RC, rc);
xpc_connection_send_message(connection, reply);
xpc_release(reply);
if (free_context) {
free(context);
}
}
}
bool check_signature(xpc_connection_t connection)
{
#if !(DEBUG || RC_BUILDIT_YES)
audit_token_t token;
xpc_connection_get_audit_token(connection, &token);
SecTaskRef task = SecTaskCreateWithAuditToken(NULL, token);
if (task == NULL) {
os_log(OS_LOG_DEFAULT, "failed getting SecTaskRef of the client");
return false;
}
uint32_t flags = SecTaskGetCodeSignStatus(task);
if ((flags & (CS_VALID | CS_PLATFORM_BINARY | CS_PLATFORM_PATH)) != (CS_VALID | CS_PLATFORM_BINARY)) {
if (SecIsInternalRelease()) {
if ((flags & (CS_DEBUGGED | CS_PLATFORM_BINARY | CS_PLATFORM_PATH)) != (CS_DEBUGGED | CS_PLATFORM_BINARY)) {
os_log(OS_LOG_DEFAULT, "client is not a platform binary: 0x%08x", flags);
CFRelease(task);
return false;
}
} else {
os_log(OS_LOG_DEFAULT, "client is not a platform binary: 0x%08x", flags);
CFRelease(task);
return false;
}
}
CFStringRef signingIdentifier = SecTaskCopySigningIdentifier(task, NULL);
CFRelease(task);
if (signingIdentifier == NULL) {
os_log(OS_LOG_DEFAULT, "client has no code signing identifier");
return false;
}
bool res = CFEqual(signingIdentifier, CFSTR("com.apple.securityd"));
CFRelease(signingIdentifier);
if (!res) {
os_log(OS_LOG_DEFAULT, "client is not securityd");
}
return res;
#else
return true;
#endif
}
static void register_for_notifications()
{
__block kern_return_t kr;
static mach_port_t mp = MACH_PORT_NULL;
static dispatch_once_t onceToken = 0;
dispatch_once(&onceToken, ^{
kr = mach_port_allocate(mach_task_self(), MACH_PORT_RIGHT_RECEIVE, &mp);
if (kr == KERN_SUCCESS) {
dispatch_source_t mach_src = dispatch_source_create(DISPATCH_SOURCE_TYPE_MACH_RECV, mp, 0, dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0));
dispatch_source_set_event_handler(mach_src, ^{
mach_msg_return_t mr;
uint8_t buf[sizeof(aks_notification_msg_t) + MAX_TRAILER_SIZE] = {};
aks_notification_msg_t * msg = (aks_notification_msg_t*)buf;
mr = mach_msg((mach_msg_header_t*)&buf, MACH_RCV_MSG, 0, sizeof(buf), mp, MACH_MSG_TIMEOUT_NONE, MACH_PORT_NULL);
if (mr == MACH_MSG_SUCCESS && msg->hdr.msgh_id == AKS_NOTIFICATION_MSGID) {
} else if (mr == MACH_MSG_SUCCESS && msg->hdr.msgh_id == AKS_NOTIFICATION_WRITE_SYSTEM_KEYBAG) {
os_log(OS_LOG_DEFAULT, "request to update handle %d", msg->handle);
update_keybag_handle(msg->handle);
} else {
os_log(OS_LOG_DEFAULT, "mach_msg error: %x", mr);
}
});
dispatch_resume(mach_src);
} else {
os_log(OS_LOG_DEFAULT, "failed to create notification port");
}
});
kr = aks_register_for_notifications(mp, AKS_NOTIFICATION_WRITE_SYSTEM_KEYBAG);
if (kr == KERN_SUCCESS) {
os_log(OS_LOG_DEFAULT, "registered for notifications");
} else {
os_log(OS_LOG_DEFAULT, "failed to register for notifications %d", kr);
}
}
int main(int argc, const char * argv[])
{
char * errorbuf;
if (sandbox_init(SECURITYD_SERVICE_NAME, SANDBOX_NAMED, &errorbuf) != 0) {
os_log(OS_LOG_DEFAULT, "sandbox_init failed %{public}s", errorbuf);
sandbox_free_error(errorbuf);
#ifndef DEBUG
abort();
#endif
}
register_for_notifications();
xpc_connection_t listener = xpc_connection_create_mach_service(SECURITYD_SERVICE_NAME, NULL, XPC_CONNECTION_MACH_SERVICE_LISTENER);
xpc_connection_set_event_handler(listener, ^(xpc_object_t peer) {
xpc_connection_set_event_handler(peer, ^(xpc_object_t event) {
xpc_transaction_begin();
service_peer_event_handler(peer, event);
xpc_transaction_end();
});
xpc_connection_resume(peer);
});
xpc_connection_resume(listener);
dispatch_main();
}