2017-04-08 01:37:43 +02:00
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#include <fcntl.h>
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2017-04-15 20:42:24 +02:00
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#include <pthread.h>
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2017-11-14 22:15:58 +01:00
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#include <signal.h>
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2020-04-12 14:34:56 +02:00
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#include <libgen.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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2017-11-27 21:43:46 +01:00
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#include <sys/mount.h>
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2020-05-10 09:48:41 +02:00
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#include <android/log.h>
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2017-04-08 01:37:43 +02:00
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2020-03-09 09:50:30 +01:00
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#include <magisk.hpp>
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#include <utils.hpp>
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#include <daemon.hpp>
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#include <selinux.hpp>
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#include <db.hpp>
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#include <resetprop.hpp>
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2019-02-10 09:57:51 +01:00
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#include <flags.h>
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2017-04-15 20:42:24 +02:00
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2020-04-12 14:34:56 +02:00
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using namespace std;
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2019-01-20 23:52:19 +01:00
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int SDK_INT = -1;
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2019-03-30 11:49:29 +01:00
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bool RECOVERY_MODE = false;
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2020-04-12 14:34:56 +02:00
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string MAGISKTMP;
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2020-05-18 14:18:49 +02:00
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int daemon_state = STATE_UNKNOWN;
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2019-09-17 06:21:07 +02:00
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static struct stat self_st;
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2019-01-20 23:52:19 +01:00
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2020-05-18 14:18:49 +02:00
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static bool verify_client(int client, pid_t pid) {
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2019-02-09 21:02:46 +01:00
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// Verify caller is the same as server
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char path[32];
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sprintf(path, "/proc/%d/exe", pid);
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2019-09-13 09:14:21 +02:00
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struct stat st;
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2020-05-18 14:18:49 +02:00
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return !(stat(path, &st) || st.st_dev != self_st.st_dev || st.st_ino != self_st.st_ino);
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}
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static void request_handler(int client, int req_code, ucred cred) {
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switch (req_code) {
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case MAGISKHIDE:
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magiskhide_handler(client);
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break;
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case SUPERUSER:
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su_daemon_handler(client, &cred);
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break;
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case POST_FS_DATA:
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post_fs_data(client);
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break;
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case LATE_START:
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late_start(client);
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break;
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case BOOT_COMPLETE:
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boot_complete(client);
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break;
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case SQLITE_CMD:
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exec_sql(client);
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break;
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case REMOVE_MODULES:
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foreach_modules("remove");
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write_int(client, 0);
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2019-02-09 21:02:46 +01:00
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close(client);
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2020-05-18 14:18:49 +02:00
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reboot();
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break;
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default:
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close(client);
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break;
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2019-02-09 21:02:46 +01:00
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}
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2018-10-13 03:46:09 +02:00
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}
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2020-05-18 14:18:49 +02:00
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static void handle_request(int client) {
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int req_code;
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2017-05-05 10:13:26 +02:00
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2020-05-18 14:18:49 +02:00
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// Verify client credentials
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ucred cred;
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get_client_cred(client, &cred);
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if (cred.uid != 0 && !verify_client(client, cred.pid))
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goto shortcut;
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2017-05-05 10:13:26 +02:00
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2020-05-18 14:18:49 +02:00
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// Check client permissions
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req_code = read_int(client);
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switch (req_code) {
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2018-11-01 19:08:33 +01:00
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case MAGISKHIDE:
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2017-05-05 10:13:26 +02:00
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case POST_FS_DATA:
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case LATE_START:
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2018-08-09 08:52:44 +02:00
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case BOOT_COMPLETE:
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2018-11-16 09:20:30 +01:00
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case SQLITE_CMD:
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2020-04-19 12:33:25 +02:00
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case GET_PATH:
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2020-05-18 14:18:49 +02:00
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if (cred.uid != 0) {
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2017-05-05 10:13:26 +02:00
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write_int(client, ROOT_REQUIRED);
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2020-05-18 14:18:49 +02:00
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goto shortcut;
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2017-05-05 10:13:26 +02:00
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}
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2020-04-30 10:26:50 +02:00
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break;
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case REMOVE_MODULES:
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2020-05-18 14:18:49 +02:00
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if (cred.uid != UID_SHELL && cred.uid != UID_ROOT) {
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2020-04-30 10:26:50 +02:00
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write_int(client, 1);
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2020-05-18 14:18:49 +02:00
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goto shortcut;
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2020-04-30 10:26:50 +02:00
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}
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break;
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2017-05-05 10:13:26 +02:00
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}
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2020-05-18 14:18:49 +02:00
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switch (req_code) {
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// In case of init trigger launches, set the corresponding states
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2017-04-15 13:02:07 +02:00
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case POST_FS_DATA:
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2020-05-18 14:18:49 +02:00
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daemon_state = STATE_POST_FS_DATA;
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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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2020-05-18 14:18:49 +02:00
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daemon_state = STATE_LATE_START;
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2017-04-15 13:02:07 +02:00
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break;
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2018-08-09 08:52:44 +02:00
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case BOOT_COMPLETE:
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2020-05-18 14:18:49 +02:00
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daemon_state = STATE_BOOT_COMPLETE;
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2019-09-13 09:14:21 +02:00
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break;
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2020-05-18 14:18:49 +02:00
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// Simple requests to query daemon info
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case CHECK_VERSION:
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write_string(client, MAGISK_VERSION ":MAGISK");
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goto shortcut;
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case CHECK_VERSION_CODE:
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write_int(client, MAGISK_VER_CODE);
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goto shortcut;
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2020-04-12 14:34:56 +02:00
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case GET_PATH:
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write_string(client, MAGISKTMP.data());
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2020-05-18 14:18:49 +02:00
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goto shortcut;
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case DO_NOTHING:
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goto shortcut;
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2017-04-09 01:25:10 +02:00
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}
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2020-05-18 14:18:49 +02:00
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// Create new thread to handle complex requests
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new_daemon_thread(std::bind(&request_handler, client, req_code, cred));
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return;
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shortcut:
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close(client);
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2017-04-08 01:37:43 +02:00
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}
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2020-05-10 09:48:41 +02:00
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static void android_logging() {
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static constexpr char TAG[] = "Magisk";
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#ifdef MAGISK_DEBUG
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log_cb.d = [](auto fmt, auto ap){ return __android_log_vprint(ANDROID_LOG_DEBUG, TAG, fmt, ap); };
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#else
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log_cb.d = nop_log;
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#endif
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log_cb.i = [](auto fmt, auto ap){ return __android_log_vprint(ANDROID_LOG_INFO, TAG, fmt, ap); };
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log_cb.w = [](auto fmt, auto ap){ return __android_log_vprint(ANDROID_LOG_WARN, TAG, fmt, ap); };
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log_cb.e = [](auto fmt, auto ap){ return __android_log_vprint(ANDROID_LOG_ERROR, TAG, fmt, ap); };
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log_cb.ex = nop_ex;
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}
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2020-04-19 12:33:25 +02:00
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static void daemon_entry(int ppid) {
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2018-09-27 09:11:10 +02:00
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android_logging();
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2019-11-26 01:07:06 +01:00
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int fd = xopen("/dev/null", O_WRONLY);
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xdup2(fd, STDOUT_FILENO);
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xdup2(fd, STDERR_FILENO);
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if (fd > STDERR_FILENO)
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close(fd);
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fd = xopen("/dev/zero", O_RDONLY);
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xdup2(fd, STDIN_FILENO);
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if (fd > STDERR_FILENO)
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close(fd);
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2017-11-22 09:12:08 +01:00
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setsid();
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2018-11-04 09:38:06 +01:00
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setcon("u:r:" SEPOL_PROC_DOMAIN ":s0");
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2020-04-12 14:34:56 +02:00
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2020-04-19 12:33:25 +02:00
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// Make sure ppid is not in acct
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char src[64], dest[64];
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sprintf(src, "/acct/uid_0/pid_%d", ppid);
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sprintf(dest, "/acct/uid_0/pid_%d", getpid());
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rename(src, dest);
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2020-04-12 14:34:56 +02:00
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// Get self stat
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2020-04-19 12:33:25 +02:00
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xreadlink("/proc/self/exe", src, sizeof(src));
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MAGISKTMP = dirname(src);
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2020-04-12 14:34:56 +02:00
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xstat("/proc/self/exe", &self_st);
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2020-04-19 12:33:25 +02:00
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restore_tmpcon();
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2019-04-24 06:13:48 +02:00
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2020-04-19 12:33:25 +02:00
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// SAR cleanups
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2020-04-12 14:34:56 +02:00
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auto mount_list = MAGISKTMP + "/" ROOTMNT;
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if (access(mount_list.data(), F_OK) == 0) {
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file_readline(true, mount_list.data(), [](string_view line) -> bool {
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2019-07-17 08:54:52 +02:00
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umount2(line.data(), MNT_DETACH);
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return true;
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2019-12-13 06:37:06 +01:00
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});
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2019-07-17 08:54:52 +02:00
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}
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2020-04-19 12:33:25 +02:00
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unlink("/dev/.se");
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2019-06-26 08:31:59 +02:00
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2020-03-23 09:17:13 +01:00
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LOGI(NAME_WITH_VER(Magisk) " daemon started\n");
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2019-02-09 21:02:46 +01:00
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2019-01-20 23:52:19 +01:00
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// Get API level
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parse_prop_file("/system/build.prop", [](auto key, auto val) -> bool {
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2019-03-06 02:27:09 +01:00
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if (key == "ro.build.version.sdk") {
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2019-03-08 02:31:35 +01:00
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SDK_INT = parse_int(val);
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2019-01-20 23:52:19 +01:00
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return false;
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}
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return true;
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});
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2020-02-03 05:58:59 +01:00
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if (SDK_INT < 0) {
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// In case some devices do not store this info in build.prop, fallback to getprop
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auto sdk = getprop("ro.build.version.sdk");
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if (!sdk.empty()) {
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SDK_INT = parse_int(sdk);
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}
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}
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2020-04-19 12:33:25 +02:00
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LOGI("* Device API level: %d\n", SDK_INT);
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2019-01-20 23:52:19 +01:00
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2019-03-30 11:49:29 +01:00
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// Load config status
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2020-04-12 14:34:56 +02:00
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auto config = MAGISKTMP + "/" INTLROOT "/config";
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parse_prop_file(config.data(), [](auto key, auto val) -> bool {
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2019-03-30 11:49:29 +01:00
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if (key == "RECOVERYMODE" && val == "true")
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RECOVERY_MODE = true;
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return true;
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});
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2017-10-14 15:08:05 +02:00
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struct sockaddr_un sun;
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2018-10-12 06:50:47 +02:00
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socklen_t len = setup_sockaddr(&sun, MAIN_SOCKET);
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2018-09-16 10:16:18 +02:00
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fd = xsocket(AF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0);
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if (xbind(fd, (struct sockaddr*) &sun, len))
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2017-11-27 20:42:48 +01:00
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exit(1);
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2017-10-14 15:08:05 +02:00
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xlisten(fd, 10);
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2017-04-08 01:37:43 +02:00
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// Change process name
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2019-02-15 10:31:39 +01:00
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set_nice_name("magiskd");
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2017-04-09 01:25:10 +02:00
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2019-02-10 10:18:50 +01:00
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// Block all signals
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2018-07-02 19:38:19 +02:00
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sigset_t block_set;
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2019-02-10 10:18:50 +01:00
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sigfillset(&block_set);
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2019-01-20 23:52:19 +01:00
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pthread_sigmask(SIG_SETMASK, &block_set, nullptr);
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2018-07-02 19:38:19 +02:00
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2017-05-07 21:11:14 +02:00
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// Loop forever to listen for requests
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2019-02-14 23:36:18 +01:00
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for (;;) {
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2019-09-19 06:13:42 +02:00
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int client = xaccept4(fd, nullptr, nullptr, SOCK_CLOEXEC);
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2020-05-18 14:18:49 +02:00
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handle_request(client);
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2017-04-08 01:37:43 +02:00
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}
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}
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2019-03-04 22:45:18 +01:00
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int connect_daemon(bool create) {
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2017-04-08 01:37:43 +02:00
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struct sockaddr_un sun;
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2018-10-12 06:50:47 +02:00
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socklen_t len = setup_sockaddr(&sun, MAIN_SOCKET);
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int fd = xsocket(AF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0);
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if (connect(fd, (struct sockaddr*) &sun, len)) {
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2019-03-04 22:45:18 +01:00
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if (!create || getuid() != UID_ROOT || getgid() != UID_ROOT) {
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LOGE("No daemon is currently running!\n");
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2017-10-13 18:08:12 +02:00
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exit(1);
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2017-10-08 16:00:22 +02:00
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}
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2019-10-31 06:57:47 +01:00
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int ppid = getpid();
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2018-10-12 06:50:47 +02:00
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LOGD("client: launching new main daemon process\n");
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2018-04-29 06:17:28 +02:00
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if (fork_dont_care() == 0) {
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2018-10-12 06:50:47 +02:00
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close(fd);
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2020-04-19 12:33:25 +02:00
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daemon_entry(ppid);
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2017-10-08 16:00:22 +02:00
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}
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2018-10-12 06:50:47 +02:00
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while (connect(fd, (struct sockaddr*) &sun, len))
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2017-11-27 20:42:48 +01:00
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usleep(10000);
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2017-04-08 01:37:43 +02:00
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}
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return fd;
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}
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