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(bb_applet_name, 0, LOG_AUTH);
49 if (getopt32 (argc, argv, "t:", &timeout_arg)) {
50 if (safe_strtoi(timeout_arg, &timeout)) {
58 dup(xopen(argv[optind], O_RDWR));
63 if (!isatty(0) || !isatty(1) || !isatty(2)) {
64 logmode = LOGMODE_SYSLOG;
65 bb_error_msg_and_die("not a tty");
68 /* Clear out anything dangerous from the environment */
69 for (p = forbid; *p; p++)
72 signal(SIGALRM, catchalarm);
74 if (!(pwd = getpwuid(0))) {
78 if (ENABLE_FEATURE_SHADOWPASSWDS) {
79 if (!(spwd = getspnam(pwd->pw_name))) {
82 pwd->pw_passwd = spwd->sp_pwdp;
86 /* cp points to a static buffer that is zeroed every time */
87 cp = bb_askpass(timeout,
88 "Give root password for system maintenance\n"
89 "(or type Control-D for normal startup):");
92 bb_info_msg("Normal startup");
95 if (strcmp(pw_encrypt(cp, pwd->pw_passwd), pwd->pw_passwd) == 0) {
98 bb_do_delay(FAIL_DELAY);
99 bb_error_msg("login incorrect");
101 memset(cp, 0, strlen(cp));
102 signal(SIGALRM, SIG_DFL);
104 bb_info_msg("System Maintenance Mode");
106 USE_SELINUX(renew_current_security_context());
108 run_shell(pwd->pw_shell, 1, 0, 0);
112 bb_error_msg_and_die("no password entry for `root'");