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 UNUSED_PARAM junk)
13 // exit(EXIT_FAILURE);
17 int sulogin_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
18 int sulogin_main(int argc UNUSED_PARAM, char **argv)
24 #if ENABLE_FEATURE_SHADOWPASSWDS
25 /* Using _r function to avoid pulling in static buffers */
30 logmode = LOGMODE_BOTH;
31 openlog(applet_name, 0, LOG_AUTH);
33 opt_complementary = "t+"; /* -t N */
34 getopt32(argv, "t:", &timeout);
40 dup(xopen(argv[0], O_RDWR));
45 /* Malicious use like "sulogin /dev/sda"? */
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_if_suid();
59 #if ENABLE_FEATURE_SHADOWPASSWDS
61 /* getspnam_r may return 0 yet set result to NULL.
62 * At least glibc 2.4 does this. Be extra paranoid here. */
63 struct spwd *result = NULL;
64 int r = getspnam_r(pwd->pw_name, &spw, buffer, sizeof(buffer), &result);
68 pwd->pw_passwd = result->sp_pwdp;
76 /* cp points to a static buffer that is zeroed every time */
77 cp = bb_ask(STDIN_FILENO, timeout,
78 "Give root password for system maintenance\n"
79 "(or type Control-D for normal startup):");
82 bb_info_msg("Normal startup");
85 encrypted = pw_encrypt(cp, pwd->pw_passwd, 1);
86 r = strcmp(encrypted, pwd->pw_passwd);
91 bb_do_delay(FAIL_DELAY);
92 bb_error_msg("login incorrect");
94 memset(cp, 0, strlen(cp));
95 // signal(SIGALRM, SIG_DFL);
97 bb_info_msg("System Maintenance Mode");
99 IF_SELINUX(renew_current_security_context());
101 shell = getenv("SUSHELL");
103 shell = getenv("sushell");
105 shell = pwd->pw_shell;
107 /* Exec login shell with no additional parameters. Never returns. */
108 run_shell(shell, 1, NULL, NULL);
111 bb_error_msg_and_die("no password entry for root");