2002-06-23 04:24:25 +00:00
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/* vi: set sw=4 ts=4: */
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2006-07-12 07:56:04 +00:00
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/*
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2006-09-08 17:22:05 +00:00
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* Mini sulogin implementation for busybox
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*
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2010-08-16 18:14:46 +00:00
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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2006-07-12 07:56:04 +00:00
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*/
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2011-04-01 20:56:30 +00:00
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//usage:#define sulogin_trivial_usage
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//usage: "[-t N] [TTY]"
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//usage:#define sulogin_full_usage "\n\n"
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//usage: "Single user login\n"
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//usage: "\n -t N Timeout"
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2007-05-26 19:00:18 +00:00
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#include "libbb.h"
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2008-01-27 12:50:12 +00:00
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#include <syslog.h>
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2002-06-23 04:24:25 +00:00
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2007-10-11 10:05:36 +00:00
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int sulogin_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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2008-07-05 09:18:54 +00:00
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int sulogin_main(int argc UNUSED_PARAM, char **argv)
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2002-06-23 04:24:25 +00:00
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{
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int timeout = 0;
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2006-09-08 17:22:05 +00:00
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struct passwd *pwd;
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2006-10-14 11:47:02 +00:00
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const char *shell;
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2006-01-25 00:08:53 +00:00
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2006-09-09 14:00:58 +00:00
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logmode = LOGMODE_BOTH;
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2006-10-03 21:00:43 +00:00
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openlog(applet_name, 0, LOG_AUTH);
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2006-01-25 00:08:53 +00:00
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2008-03-17 09:09:09 +00:00
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opt_complementary = "t+"; /* -t N */
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getopt32(argv, "t:", &timeout);
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2008-11-09 00:15:11 +00:00
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argv += optind;
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2006-09-08 17:22:05 +00:00
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2008-11-09 00:15:11 +00:00
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if (argv[0]) {
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2006-09-08 17:22:05 +00:00
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close(0);
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close(1);
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2008-11-09 00:15:11 +00:00
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dup(xopen(argv[0], O_RDWR));
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2006-09-11 00:34:01 +00:00
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close(2);
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2006-09-08 17:22:05 +00:00
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dup(0);
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2002-06-23 04:24:25 +00:00
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}
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2006-09-08 17:22:05 +00:00
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2008-03-17 09:09:09 +00:00
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/* Malicious use like "sulogin /dev/sda"? */
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2006-09-08 17:22:05 +00:00
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if (!isatty(0) || !isatty(1) || !isatty(2)) {
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2006-09-09 14:00:58 +00:00
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logmode = LOGMODE_SYSLOG;
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bb_error_msg_and_die("not a tty");
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2006-09-07 16:20:03 +00:00
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}
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2002-06-23 04:24:25 +00:00
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2007-11-06 05:26:51 +00:00
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/* Clear dangerous stuff, set PATH */
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2008-02-18 11:08:33 +00:00
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sanitize_env_if_suid();
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2002-06-23 04:24:25 +00:00
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2006-10-14 11:47:02 +00:00
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pwd = getpwuid(0);
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if (!pwd) {
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2006-09-09 14:00:58 +00:00
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goto auth_error;
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2006-09-17 16:28:10 +00:00
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}
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2006-09-08 17:22:05 +00:00
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2002-06-23 04:24:25 +00:00
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while (1) {
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2008-06-12 16:56:52 +00:00
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int r;
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2013-11-19 12:09:06 +00:00
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r = ask_and_check_password_extended(pwd, timeout,
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"Give root password for system maintenance\n"
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"(or type Control-D for normal startup):"
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);
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if (r < 0) {
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2013-05-21 15:01:55 +00:00
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/* ^D, ^C, timeout, or read error */
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2006-09-08 17:22:05 +00:00
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bb_info_msg("Normal startup");
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2006-09-09 14:00:58 +00:00
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return 0;
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2002-06-23 04:24:25 +00:00
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}
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2013-11-19 12:09:06 +00:00
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if (r > 0) {
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2002-06-23 04:24:25 +00:00
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break;
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}
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2011-03-08 20:07:05 +00:00
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bb_do_delay(LOGIN_FAIL_DELAY);
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bb_info_msg("Login incorrect");
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2002-06-23 04:24:25 +00:00
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}
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2005-05-03 06:25:50 +00:00
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2006-09-08 17:22:05 +00:00
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bb_info_msg("System Maintenance Mode");
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2005-05-03 06:25:50 +00:00
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2009-04-21 11:09:40 +00:00
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IF_SELINUX(renew_current_security_context());
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2005-05-03 06:25:50 +00:00
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2006-10-14 11:47:02 +00:00
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shell = getenv("SUSHELL");
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2007-09-10 13:15:28 +00:00
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if (!shell)
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shell = getenv("sushell");
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2010-06-27 01:23:31 +00:00
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if (!shell)
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shell = pwd->pw_shell;
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2007-09-10 13:15:28 +00:00
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/* Exec login shell with no additional parameters. Never returns. */
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run_shell(shell, 1, NULL, NULL);
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2006-09-09 14:00:58 +00:00
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2007-10-20 19:20:22 +00:00
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auth_error:
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bb_error_msg_and_die("no password entry for root");
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2002-06-23 04:24:25 +00:00
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}
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