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.
11 //static void catchalarm(int ATTRIBUTE_UNUSED junk)
13 // exit(EXIT_FAILURE);
17 int sulogin_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
18 int sulogin_main(int argc, char **argv)
25 #if ENABLE_FEATURE_SHADOWPASSWDS
26 /* Using _r function to avoid pulling in static buffers */
31 logmode = LOGMODE_BOTH;
32 openlog(applet_name, 0, LOG_AUTH);
34 if (getopt32(argv, "t:", &timeout_arg)) {
35 timeout = xatoi_u(timeout_arg);
41 dup(xopen(argv[optind], O_RDWR));
46 if (!isatty(0) || !isatty(1) || !isatty(2)) {
47 logmode = LOGMODE_SYSLOG;
48 bb_error_msg_and_die("not a tty");
51 /* Clear dangerous stuff, set PATH */
52 sanitize_env_for_suid();
54 // bb_askpass() already handles this
55 // signal(SIGALRM, catchalarm);
62 #if ENABLE_FEATURE_SHADOWPASSWDS
64 /* getspnam_r may return 0 yet set result to NULL.
65 * At least glibc 2.4 does this. Be extra paranoid here. */
66 struct spwd *result = NULL;
67 int r = getspnam_r(pwd->pw_name, &spw, buffer, sizeof(buffer), &result);
71 pwd->pw_passwd = result->sp_pwdp;
76 /* cp points to a static buffer that is zeroed every time */
77 cp = bb_askpass(timeout,
78 "Give root password for system maintenance\n"
79 "(or type Control-D for normal startup):");
82 bb_info_msg("Normal startup");
85 if (strcmp(pw_encrypt(cp, pwd->pw_passwd), pwd->pw_passwd) == 0) {
88 bb_do_delay(FAIL_DELAY);
89 bb_error_msg("login incorrect");
91 memset(cp, 0, strlen(cp));
92 // signal(SIGALRM, SIG_DFL);
94 bb_info_msg("System Maintenance Mode");
96 USE_SELINUX(renew_current_security_context());
98 shell = getenv("SUSHELL");
100 shell = getenv("sushell");
103 if (pwd->pw_shell[0])
104 shell = pwd->pw_shell;
106 /* Exec login shell with no additional parameters. Never returns. */
107 run_shell(shell, 1, NULL, NULL);
110 bb_error_msg_and_die("no password entry for root");