2017-04-08 01:37:43 +02:00
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/* daemon.c - Magisk Daemon
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*
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* Start the daemon and wait for requests
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* Connect the daemon and send requests through sockets
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*/
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <string.h>
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2017-04-09 01:25:10 +02:00
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#include <errno.h>
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2017-04-15 20:42:24 +02:00
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#include <pthread.h>
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2017-04-08 01:37:43 +02:00
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#include <sys/un.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <sys/stat.h>
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2017-04-15 13:02:07 +02:00
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#include <sys/mount.h>
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2017-04-08 01:37:43 +02:00
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#include "magisk.h"
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#include "utils.h"
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#include "daemon.h"
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2017-04-15 20:42:24 +02:00
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#include "magiskpolicy.h"
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pthread_t sepol_patch;
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2017-04-08 01:37:43 +02:00
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2017-04-21 18:54:08 +02:00
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static void *request_handler(void *args) {
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2017-04-22 00:33:40 +02:00
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// Setup the default error handler for threads
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err_handler = exit_thread;
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2017-04-21 18:54:08 +02:00
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int client = *((int *) args);
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free(args);
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2017-04-09 01:25:10 +02:00
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client_request req = read_int(client);
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char *s;
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int pid, status, code;
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switch (req) {
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case LAUNCH_MAGISKHIDE:
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launch_magiskhide(client);
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break;
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case STOP_MAGISKHIDE:
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stop_magiskhide(client);
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break;
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case ADD_HIDELIST:
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2017-04-20 16:45:56 +02:00
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add_hide_list(client);
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2017-04-09 01:25:10 +02:00
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break;
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case RM_HIDELIST:
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2017-04-20 16:45:56 +02:00
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rm_hide_list(client);
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2017-04-09 01:25:10 +02:00
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break;
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case SUPERUSER:
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2017-04-14 21:23:09 +02:00
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su_daemon_receiver(client);
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break;
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case CHECK_VERSION:
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2017-04-18 15:31:12 +02:00
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write_string(client, MAGISK_VER_STR);
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2017-04-14 21:23:09 +02:00
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close(client);
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break;
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case CHECK_VERSION_CODE:
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2017-04-18 15:31:12 +02:00
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write_int(client, MAGISK_VER_CODE);
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2017-04-14 21:23:09 +02:00
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close(client);
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2017-04-09 01:25:10 +02:00
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break;
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2017-04-15 13:02:07 +02:00
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case POST_FS:
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2017-04-15 20:42:24 +02:00
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post_fs(client);
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2017-04-15 13:02:07 +02:00
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break;
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case POST_FS_DATA:
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2017-04-15 20:42:24 +02:00
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post_fs_data(client);
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2017-04-15 13:02:07 +02:00
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break;
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2017-04-15 20:42:24 +02:00
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case LATE_START:
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late_start(client);
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2017-04-15 13:02:07 +02:00
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break;
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2017-04-09 01:25:10 +02:00
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case TEST:
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s = read_string(client);
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LOGI("%s\n", s);
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free(s);
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write_int(client, 0);
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2017-04-14 21:23:09 +02:00
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close(client);
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2017-04-09 01:25:10 +02:00
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break;
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}
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2017-04-21 18:54:08 +02:00
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return NULL;
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2017-04-08 01:37:43 +02:00
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}
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/* Setup the address and return socket fd */
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static int setup_socket(struct sockaddr_un *sun) {
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int fd = xsocket(AF_LOCAL, SOCK_STREAM, 0);
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if (fcntl(fd, F_SETFD, FD_CLOEXEC)) {
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2017-04-14 21:23:09 +02:00
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PLOGE("fcntl FD_CLOEXEC");
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2017-04-08 01:37:43 +02:00
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}
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memset(sun, 0, sizeof(*sun));
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sun->sun_family = AF_LOCAL;
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memcpy(sun->sun_path, REQUESTOR_DAEMON_PATH, REQUESTOR_DAEMON_PATH_LEN);
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return fd;
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}
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2017-04-09 01:25:10 +02:00
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static void do_nothing() {}
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2017-04-15 20:42:24 +02:00
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static void *large_sepol_patch(void *args) {
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LOGD("sepol: Starting large patch thread\n");
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// Patch su to everything
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sepol_allow("su", ALL, ALL, ALL);
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dump_policydb("/sys/fs/selinux/load");
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LOGD("sepol: Large patch done\n");
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destroy_policydb();
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return NULL;
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}
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2017-04-08 01:37:43 +02:00
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void start_daemon() {
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// Launch the daemon, create new session, set proper context
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2017-04-14 21:23:09 +02:00
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if (getuid() != UID_ROOT || getgid() != UID_ROOT) {
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2017-04-09 01:25:10 +02:00
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fprintf(stderr, "Starting daemon requires root: %s\n", strerror(errno));
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PLOGE("start daemon");
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2017-04-08 01:37:43 +02:00
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}
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switch (fork()) {
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case -1:
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PLOGE("fork");
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case 0:
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break;
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default:
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return;
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}
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xsetsid();
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xsetcon("u:r:su:s0");
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2017-04-21 18:54:08 +02:00
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// Patch selinux with medium patch before we do anything
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2017-04-15 20:42:24 +02:00
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load_policydb("/sys/fs/selinux/policy");
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sepol_med_rules();
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dump_policydb("/sys/fs/selinux/load");
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2017-04-21 18:54:08 +02:00
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// Continue the larger patch in another thread, we will need to join later
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2017-04-15 20:42:24 +02:00
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pthread_create(&sepol_patch, NULL, large_sepol_patch, NULL);
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2017-04-08 01:37:43 +02:00
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struct sockaddr_un sun;
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int fd = setup_socket(&sun);
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xbind(fd, (struct sockaddr*) &sun, sizeof(sun));
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xlisten(fd, 10);
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// Change process name
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strcpy(argv0, "magisk_daemon");
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2017-04-09 01:25:10 +02:00
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// The root daemon should not do anything if an error occurs
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2017-04-14 21:23:09 +02:00
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// It should stay intact under any circumstances
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2017-04-09 01:25:10 +02:00
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err_handler = do_nothing;
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// Start log monitor
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monitor_logs();
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2017-04-08 01:37:43 +02:00
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2017-04-20 16:45:56 +02:00
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LOGI("Magisk v" xstr(MAGISK_VERSION) " daemon started\n");
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2017-04-15 20:42:24 +02:00
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2017-04-15 12:33:16 +02:00
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// Unlock all blocks for rw
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unlock_blocks();
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2017-04-15 13:02:07 +02:00
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// Setup links under /sbin
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2017-04-17 10:36:49 +02:00
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xmount(NULL, "/", NULL, MS_REMOUNT, NULL);
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2017-04-15 13:02:07 +02:00
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create_links(NULL, "/sbin");
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2017-04-15 20:42:24 +02:00
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chmod("/sbin", 0755);
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2017-04-21 18:54:08 +02:00
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mkdir("/magisk", 0755);
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chmod("/magisk", 0755);
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2017-04-17 10:36:49 +02:00
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xmount(NULL, "/", NULL, MS_REMOUNT | MS_RDONLY, NULL);
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2017-04-15 13:02:07 +02:00
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2017-04-08 01:37:43 +02:00
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// Loop forever to listen to requests
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while(1) {
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2017-04-21 18:54:08 +02:00
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int *client = xmalloc(sizeof(int));
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*client = xaccept(fd, NULL, NULL);
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pthread_t thread;
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xpthread_create(&thread, NULL, request_handler, client);
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// Detach the thread, we will never join it
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pthread_detach(thread);
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2017-04-08 01:37:43 +02:00
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}
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}
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/* Connect the daemon, and return a socketfd */
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int connect_daemon() {
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struct sockaddr_un sun;
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int fd = setup_socket(&sun);
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2017-04-17 10:36:49 +02:00
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// LOGD("client: trying to connect socket\n");
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2017-04-08 01:37:43 +02:00
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if (connect(fd, (struct sockaddr*) &sun, sizeof(sun))) {
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/* If we cannot access the daemon, we start the daemon
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* since there is no clear entry point when the daemon should be started
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*/
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2017-04-17 10:36:49 +02:00
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LOGD("client: connect fail, try launching new daemon process\n");
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2017-04-08 01:37:43 +02:00
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start_daemon();
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do {
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// Wait for 10ms
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2017-04-17 10:36:49 +02:00
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usleep(10);
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2017-04-08 01:37:43 +02:00
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} while (connect(fd, (struct sockaddr*) &sun, sizeof(sun)));
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}
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return fd;
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}
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