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 ATTRIBUTE_UNUSED, 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);
39 dup(xopen(argv[optind], O_RDWR));
44 /* Malicious use like "sulogin /dev/sda"? */
45 if (!isatty(0) || !isatty(1) || !isatty(2)) {
46 logmode = LOGMODE_SYSLOG;
47 bb_error_msg_and_die("not a tty");
50 /* Clear dangerous stuff, set PATH */
51 sanitize_env_if_suid();
53 // bb_askpass() already handles this
54 // signal(SIGALRM, catchalarm);
61 #if ENABLE_FEATURE_SHADOWPASSWDS
63 /* getspnam_r may return 0 yet set result to NULL.
64 * At least glibc 2.4 does this. Be extra paranoid here. */
65 struct spwd *result = NULL;
66 int r = getspnam_r(pwd->pw_name, &spw, buffer, sizeof(buffer), &result);
70 pwd->pw_passwd = result->sp_pwdp;
75 /* cp points to a static buffer that is zeroed every time */
76 cp = bb_askpass(timeout,
77 "Give root password for system maintenance\n"
78 "(or type Control-D for normal startup):");
81 bb_info_msg("Normal startup");
84 if (strcmp(pw_encrypt(cp, pwd->pw_passwd), pwd->pw_passwd) == 0) {
87 bb_do_delay(FAIL_DELAY);
88 bb_error_msg("login incorrect");
90 memset(cp, 0, strlen(cp));
91 // signal(SIGALRM, SIG_DFL);
93 bb_info_msg("System Maintenance Mode");
95 USE_SELINUX(renew_current_security_context());
97 shell = getenv("SUSHELL");
99 shell = getenv("sushell");
102 if (pwd->pw_shell[0])
103 shell = pwd->pw_shell;
105 /* Exec login shell with no additional parameters. Never returns. */
106 run_shell(shell, 1, NULL, NULL);
109 bb_error_msg_and_die("no password entry for root");