/*
* Mini sulogin implementation for busybox
*
- * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
+//usage:#define sulogin_trivial_usage
+//usage: "[-t N] [TTY]"
+//usage:#define sulogin_full_usage "\n\n"
+//usage: "Single user login\n"
+//usage: "\n -t N Timeout"
+
#include "libbb.h"
#include <syslog.h>
-//static void catchalarm(int UNUSED_PARAM junk)
-//{
-// exit(EXIT_FAILURE);
-//}
-
-
int sulogin_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int sulogin_main(int argc UNUSED_PARAM, char **argv)
{
- char *cp;
int timeout = 0;
struct passwd *pwd;
const char *shell;
-#if ENABLE_FEATURE_SHADOWPASSWDS
- /* Using _r function to avoid pulling in static buffers */
- char buffer[256];
- struct spwd spw;
-#endif
logmode = LOGMODE_BOTH;
openlog(applet_name, 0, LOG_AUTH);
/* Clear dangerous stuff, set PATH */
sanitize_env_if_suid();
-// bb_ask() already handles this
-// signal(SIGALRM, catchalarm);
-
pwd = getpwuid(0);
if (!pwd) {
goto auth_error;
}
-#if ENABLE_FEATURE_SHADOWPASSWDS
- {
- /* getspnam_r may return 0 yet set result to NULL.
- * At least glibc 2.4 does this. Be extra paranoid here. */
- struct spwd *result = NULL;
- int r = getspnam_r(pwd->pw_name, &spw, buffer, sizeof(buffer), &result);
- if (r || !result) {
- goto auth_error;
- }
- pwd->pw_passwd = result->sp_pwdp;
- }
-#endif
-
while (1) {
- char *encrypted;
int r;
- /* cp points to a static buffer that is zeroed every time */
- cp = bb_ask(STDIN_FILENO, timeout,
- "Give root password for system maintenance\n"
- "(or type Control-D for normal startup):");
-
- if (!cp || !*cp) {
+ r = ask_and_check_password_extended(pwd, timeout,
+ "Give root password for system maintenance\n"
+ "(or type Control-D for normal startup):"
+ );
+ if (r < 0) {
+ /* ^D, ^C, timeout, or read error */
bb_info_msg("Normal startup");
return 0;
}
- encrypted = pw_encrypt(cp, pwd->pw_passwd, 1);
- r = strcmp(encrypted, pwd->pw_passwd);
- free(encrypted);
- if (r == 0) {
+ if (r > 0) {
break;
}
- bb_do_delay(FAIL_DELAY);
- bb_error_msg("login incorrect");
+ bb_do_delay(LOGIN_FAIL_DELAY);
+ bb_info_msg("Login incorrect");
}
- memset(cp, 0, strlen(cp));
-// signal(SIGALRM, SIG_DFL);
bb_info_msg("System Maintenance Mode");
shell = getenv("SUSHELL");
if (!shell)
shell = getenv("sushell");
- if (!shell) {
- shell = "/bin/sh";
- if (pwd->pw_shell[0])
- shell = pwd->pw_shell;
- }
+ if (!shell)
+ shell = pwd->pw_shell;
+
/* Exec login shell with no additional parameters. Never returns. */
run_shell(shell, 1, NULL, NULL);