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shadow/src/sulogin.c

237 lines
5.3 KiB

/*
* SPDX-FileCopyrightText: 1989 - 1994, Julianne Frances Haugh
* SPDX-FileCopyrightText: 1996 - 2000, Marek Michałkiewicz
* SPDX-FileCopyrightText: 2002 - 2006, Tomasz Kłoczko
* SPDX-FileCopyrightText: 2007 - 2010, Nicolas François
*
* SPDX-License-Identifier: BSD-3-Clause
*/
#include <config.h>
#ident "$Id$"
#include <fcntl.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include <sys/ioctl.h>
#include "defines.h"
#include "getdef.h"
#include "prototypes.h"
#include "pwauth.h"
/*@-exitarg@*/
#include "exitcodes.h"
#include "shadowlog.h"
/*
* Global variables
*/
const char *Prog;
static char name[BUFSIZ];
static char pass[BUFSIZ];
static struct passwd pwent;
extern char **newenvp;
extern size_t newenvc;
extern char **environ;
#ifndef ALARM
#define ALARM 60
#endif
/* local function prototypes */
static void catch_signals (int);
static void catch_signals (unused int sig)
{
_exit (1);
}
/*
* syslogd is usually not running at the time when sulogin is typically
* called, cluttering the screen with unnecessary messages. Suggested by
* Ivan Nejgebauer <ian@unsux.ns.ac.yu>. --marekm
*/
#undef USE_SYSLOG
/*ARGSUSED*/ int main (int argc, char **argv)
{
#ifndef USE_PAM
const char *env;
#endif /* !USE_PAM */
char **envp = environ;
TERMIO termio;
int err = 0;
#ifdef USE_TERMIO
ioctl (0, TCGETA, &termio);
termio.c_iflag |= (ICRNL | IXON);
termio.c_oflag |= (OPOST | ONLCR);
termio.c_cflag |= (CREAD);
termio.c_lflag |= (ISIG | ICANON | ECHO | ECHOE | ECHOK);
ioctl (0, TCSETAF, &termio);
#endif
#ifdef USE_TERMIOS
tcgetattr (0, &termio);
termio.c_iflag |= (ICRNL | IXON);
termio.c_oflag |= (CREAD);
termio.c_lflag |= (ECHO | ECHOE | ECHOK | ICANON | ISIG);
tcsetattr (0, TCSANOW, &termio);
#endif
Prog = Basename (argv[0]);
log_set_progname(Prog);
log_set_logfd(stderr);
(void) setlocale (LC_ALL, "");
(void) bindtextdomain (PACKAGE, LOCALEDIR);
(void) textdomain (PACKAGE);
#ifdef USE_SYSLOG
OPENLOG ("sulogin");
#endif
initenv ();
if (argc > 1) {
close (0);
close (1);
close (2);
if (open (argv[1], O_RDWR) >= 0) {
dup (0);
dup (0);
} else {
#ifdef USE_SYSLOG
SYSLOG (LOG_WARN, "cannot open %s\n", argv[1]);
closelog ();
#endif
exit (1);
}
}
if (access (PASSWD_FILE, F_OK) == -1) { /* must be a password file! */
(void) puts (_("No password file"));
#ifdef USE_SYSLOG
SYSLOG (LOG_WARN, "No password file\n");
closelog ();
#endif
exit (1);
}
#if !defined(DEBUG) && defined(SULOGIN_ONLY_INIT)
if (getppid () != 1) { /* parent must be INIT */
#ifdef USE_SYSLOG
SYSLOG (LOG_WARN, "Pid == %d, not 1\n", getppid ());
closelog ();
#endif
exit (1);
}
#endif
if ((isatty (0) == 0) || (isatty (1) == 0) || (isatty (2) == 0)) {
#ifdef USE_SYSLOG
closelog ();
#endif
exit (1); /* must be a terminal */
}
/* If we were init, we need to start a new session */
if (getppid() == 1) {
setsid();
if (ioctl(0, TIOCSCTTY, 1) != 0) {
(void) fputs (_("TIOCSCTTY failed"), stderr);
}
}
while (NULL != *envp) { /* add inherited environment, */
addenv (*envp, NULL); /* some variables change later */
envp++;
}
#ifndef USE_PAM
env = getdef_str ("ENV_TZ");
if (NULL != env) {
addenv (('/' == *env) ? tz (env) : env, NULL);
}
env = getdef_str ("ENV_HZ");
if (NULL != env) {
addenv (env, NULL); /* set the default $HZ, if one */
}
#endif /* !USE_PAM */
(void) strcpy (name, "root"); /* KLUDGE!!! */
(void) signal (SIGALRM, catch_signals); /* exit if the timer expires */
(void) alarm (ALARM); /* only wait so long ... */
while (true) { /* repeatedly get login/password pairs */
char *cp;
pw_entry (name, &pwent); /* get entry from password file */
if (pwent.pw_name == (char *) 0) {
/*
* Fail secure
*/
(void) puts (_("No password entry for 'root'"));
#ifdef USE_SYSLOG
SYSLOG (LOG_WARN, "No password entry for 'root'\n");
closelog ();
#endif
exit (1);
}
/*
* Here we prompt for the root password, or if no password
* is given we just exit.
*/
/* get a password for root */
cp = getpass (_(
"\n"
"Type control-d to proceed with normal startup,\n"
"(or give root password for system maintenance):"));
/*
* XXX - can't enter single user mode if root password is
* empty. I think this doesn't happen very often :-). But
* it will work with standard getpass() (no NULL on EOF).
* --marekm
*/
if ((NULL == cp) || ('\0' == *cp)) {
#ifdef USE_SYSLOG
SYSLOG (LOG_INFO, "Normal startup\n");
closelog ();
#endif
(void) puts ("");
#ifdef TELINIT
execl (PATH_TELINIT, "telinit", RUNLEVEL, (char *) 0);
#endif
exit (0);
} else {
STRFCPY (pass, cp);
strzero (cp);
}
if (valid (pass, &pwent)) { /* check encrypted passwords ... */
break; /* ... encrypted passwords matched */
}
#ifdef USE_SYSLOG
SYSLOG (LOG_WARN, "Incorrect root password\n");
#endif
sleep (2);
(void) puts (_("Login incorrect"));
}
memzero (pass, sizeof pass);
(void) alarm (0);
(void) signal (SIGALRM, SIG_DFL);
environ = newenvp; /* make new environment active */
(void) puts (_("Entering System Maintenance Mode"));
#ifdef USE_SYSLOG
SYSLOG (LOG_INFO, "System Maintenance Mode\n");
#endif
#ifdef USE_SYSLOG
closelog ();
#endif
/* exec the shell finally. */
err = shell (pwent.pw_shell, (char *) 0, environ);
return ((err == ENOENT) ? E_CMD_NOTFOUND : E_CMD_NOEXEC);
}