1 /* vi: set sw=4 ts=4: */
3 * Mini sulogin implementation for busybox
5 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
12 static const char * const forbid[] = {
21 "LD_TRACE_LOADED_OBJECTS",
23 "LD_AOUT_LIBRARY_PATH",
31 static void catchalarm(int ATTRIBUTE_UNUSED junk)
37 int sulogin_main(int argc, char **argv)
42 const char * const *p;
46 logmode = LOGMODE_BOTH;
47 openlog(applet_name, 0, LOG_AUTH);
49 if (getopt32(argc, argv, "t:", &timeout_arg)) {
50 timeout = xatoi_u(timeout_arg);
56 dup(xopen(argv[optind], O_RDWR));
61 if (!isatty(0) || !isatty(1) || !isatty(2)) {
62 logmode = LOGMODE_SYSLOG;
63 bb_error_msg_and_die("not a tty");
66 /* Clear out anything dangerous from the environment */
67 for (p = forbid; *p; p++)
70 signal(SIGALRM, catchalarm);
72 if (!(pwd = getpwuid(0))) {
76 if (ENABLE_FEATURE_SHADOWPASSWDS) {
77 if (!(spwd = getspnam(pwd->pw_name))) {
80 pwd->pw_passwd = spwd->sp_pwdp;
84 /* cp points to a static buffer that is zeroed every time */
85 cp = bb_askpass(timeout,
86 "Give root password for system maintenance\n"
87 "(or type Control-D for normal startup):");
90 bb_info_msg("Normal startup");
93 if (strcmp(pw_encrypt(cp, pwd->pw_passwd), pwd->pw_passwd) == 0) {
96 bb_do_delay(FAIL_DELAY);
97 bb_error_msg("login incorrect");
99 memset(cp, 0, strlen(cp));
100 signal(SIGALRM, SIG_DFL);
102 bb_info_msg("System Maintenance Mode");
104 USE_SELINUX(renew_current_security_context());
106 run_shell(pwd->pw_shell, 1, 0, 0);
110 bb_error_msg_and_die("no password entry for `root'");