mirror of
https://github.com/sheumann/hush.git
synced 2024-11-05 06:07:00 +00:00
3fa36e2350
function old new delta stop_handler 41 38 -3 sulogin_main 508 504 -4 got_cont 4 - -4 cont_handler 11 - -11 startservice 309 297 -12 processorstart 423 409 -14 tcpudpsvd_main 1861 1843 -18 ------------------------------------------------------------------------------ (add/remove: 0/2 grow/shrink: 0/5 up/down: 0/-66) Total: -66 bytes
118 lines
2.5 KiB
C
118 lines
2.5 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* Mini sulogin implementation for busybox
|
|
*
|
|
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
|
|
*/
|
|
|
|
#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);
|
|
|
|
opt_complementary = "t+"; /* -t N */
|
|
getopt32(argv, "t:", &timeout);
|
|
argv += optind;
|
|
|
|
if (argv[0]) {
|
|
close(0);
|
|
close(1);
|
|
dup(xopen(argv[0], O_RDWR));
|
|
close(2);
|
|
dup(0);
|
|
}
|
|
|
|
/* Malicious use like "sulogin /dev/sda"? */
|
|
if (!isatty(0) || !isatty(1) || !isatty(2)) {
|
|
logmode = LOGMODE_SYSLOG;
|
|
bb_error_msg_and_die("not a tty");
|
|
}
|
|
|
|
/* Clear dangerous stuff, set PATH */
|
|
sanitize_env_if_suid();
|
|
|
|
// bb_askpass() 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_askpass(timeout,
|
|
"Give root password for system maintenance\n"
|
|
"(or type Control-D for normal startup):");
|
|
|
|
if (!cp || !*cp) {
|
|
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) {
|
|
break;
|
|
}
|
|
bb_do_delay(FAIL_DELAY);
|
|
bb_error_msg("login incorrect");
|
|
}
|
|
memset(cp, 0, strlen(cp));
|
|
// signal(SIGALRM, SIG_DFL);
|
|
|
|
bb_info_msg("System Maintenance Mode");
|
|
|
|
USE_SELINUX(renew_current_security_context());
|
|
|
|
shell = getenv("SUSHELL");
|
|
if (!shell)
|
|
shell = getenv("sushell");
|
|
if (!shell) {
|
|
shell = "/bin/sh";
|
|
if (pwd->pw_shell[0])
|
|
shell = pwd->pw_shell;
|
|
}
|
|
/* Exec login shell with no additional parameters. Never returns. */
|
|
run_shell(shell, 1, NULL, NULL);
|
|
|
|
auth_error:
|
|
bb_error_msg_and_die("no password entry for root");
|
|
}
|