mirror of
https://github.com/sheumann/hush.git
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115 lines
2.4 KiB
C
115 lines
2.4 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Mini sulogin implementation for busybox
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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#include "libbb.h"
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#include <syslog.h>
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//static void catchalarm(int UNUSED_PARAM junk)
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//{
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// exit(EXIT_FAILURE);
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//}
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int sulogin_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int sulogin_main(int argc UNUSED_PARAM, char **argv)
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{
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char *cp;
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int timeout = 0;
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struct passwd *pwd;
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const char *shell;
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#if ENABLE_FEATURE_SHADOWPASSWDS
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/* Using _r function to avoid pulling in static buffers */
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char buffer[256];
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struct spwd spw;
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#endif
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logmode = LOGMODE_BOTH;
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openlog(applet_name, 0, LOG_AUTH);
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opt_complementary = "t+"; /* -t N */
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getopt32(argv, "t:", &timeout);
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argv += optind;
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if (argv[0]) {
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close(0);
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close(1);
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dup(xopen(argv[0], O_RDWR));
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close(2);
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dup(0);
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}
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/* Malicious use like "sulogin /dev/sda"? */
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if (!isatty(0) || !isatty(1) || !isatty(2)) {
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logmode = LOGMODE_SYSLOG;
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bb_error_msg_and_die("not a tty");
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}
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/* Clear dangerous stuff, set PATH */
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sanitize_env_if_suid();
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pwd = getpwuid(0);
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if (!pwd) {
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goto auth_error;
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}
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#if ENABLE_FEATURE_SHADOWPASSWDS
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{
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/* getspnam_r may return 0 yet set result to NULL.
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* At least glibc 2.4 does this. Be extra paranoid here. */
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struct spwd *result = NULL;
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int r = getspnam_r(pwd->pw_name, &spw, buffer, sizeof(buffer), &result);
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if (r || !result) {
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goto auth_error;
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}
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pwd->pw_passwd = result->sp_pwdp;
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}
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#endif
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while (1) {
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char *encrypted;
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int r;
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/* cp points to a static buffer that is zeroed every time */
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cp = bb_ask(STDIN_FILENO, 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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if (!cp || !*cp) {
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bb_info_msg("Normal startup");
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return 0;
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}
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encrypted = pw_encrypt(cp, pwd->pw_passwd, 1);
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r = strcmp(encrypted, pwd->pw_passwd);
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free(encrypted);
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if (r == 0) {
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break;
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}
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bb_do_delay(FAIL_DELAY);
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bb_error_msg("login incorrect");
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}
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memset(cp, 0, strlen(cp));
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// signal(SIGALRM, SIG_DFL);
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bb_info_msg("System Maintenance Mode");
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IF_SELINUX(renew_current_security_context());
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shell = getenv("SUSHELL");
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if (!shell)
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shell = getenv("sushell");
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if (!shell) {
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shell = "/bin/sh";
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if (pwd->pw_shell[0])
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shell = pwd->pw_shell;
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}
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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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auth_error:
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bb_error_msg_and_die("no password entry for root");
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}
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