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);
38 int sulogin_main(int argc, char **argv)
43 const char * const *p;
47 logmode = LOGMODE_BOTH;
48 openlog(applet_name, 0, LOG_AUTH);
50 if (getopt32(argc, argv, "t:", &timeout_arg)) {
51 timeout = xatoi_u(timeout_arg);
57 dup(xopen(argv[optind], O_RDWR));
62 if (!isatty(0) || !isatty(1) || !isatty(2)) {
63 logmode = LOGMODE_SYSLOG;
64 bb_error_msg_and_die("not a tty");
67 /* Clear out anything dangerous from the environment */
68 for (p = forbid; *p; p++)
71 signal(SIGALRM, catchalarm);
78 #if ENABLE_FEATURE_SHADOWPASSWDS
80 struct spwd *spwd = getspnam(pwd->pw_name);
84 pwd->pw_passwd = spwd->sp_pwdp;
89 /* cp points to a static buffer that is zeroed every time */
90 cp = bb_askpass(timeout,
91 "Give root password for system maintenance\n"
92 "(or type Control-D for normal startup):");
95 bb_info_msg("Normal startup");
98 if (strcmp(pw_encrypt(cp, pwd->pw_passwd), pwd->pw_passwd) == 0) {
101 bb_do_delay(FAIL_DELAY);
102 bb_error_msg("login incorrect");
104 memset(cp, 0, strlen(cp));
105 signal(SIGALRM, SIG_DFL);
107 bb_info_msg("System Maintenance Mode");
109 USE_SELINUX(renew_current_security_context());
111 shell = getenv("SUSHELL");
112 if (!shell) shell = getenv("sushell");
115 if (pwd->pw_shell[0])
116 shell = pwd->pw_shell;
118 run_shell(shell, 1, 0, 0);
122 bb_error_msg_and_die("no password entry for 'root'");