shadow/src/sulogin.c

276 lines
7.0 KiB
C

/*
* Copyright 1989 - 1994, Julianne Frances Haugh
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of Julianne F. Haugh nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY JULIE HAUGH AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL JULIE HAUGH OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <config.h>
#include "rcsid.h"
RCSID(PKG_VER "$Id: sulogin.c,v 1.10 1999/08/27 19:02:51 marekm Exp $")
#include "prototypes.h"
#include "defines.h"
#include "getdef.h"
#if HAVE_UTMPX_H
#include <utmpx.h>
#else
#include <utmp.h>
#endif
#include <signal.h>
#include <stdio.h>
#include <pwd.h>
#include <fcntl.h>
#include "pwauth.h"
static char name[BUFSIZ];
static char pass[BUFSIZ];
static struct passwd pwent;
#if 0
#if HAVE_UTMPX_H
static struct utmpx utent;
#else
static struct utmp utent;
#endif
#endif
extern char **newenvp;
extern size_t newenvc;
extern char **environ;
extern char *tz P_((const char *));
#ifndef ALARM
#define ALARM 60
#endif
/* local function prototypes */
static RETSIGTYPE catch P_((int));
int main P_((int, char **));
static RETSIGTYPE
catch(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)
{
char *cp;
char **envp = environ;
TERMIO termio;
#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
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
#ifdef USE_SYSLOG
openlog ("sulogin", LOG_PID|LOG_CONS|LOG_NOWAIT, LOG_AUTH);
#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! */
printf(_("No password file\n"));
#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) || ! isatty (1) || ! isatty (2)) {
#ifdef USE_SYSLOG
closelog ();
#endif
exit (1); /* must be a terminal */
}
while (*envp) /* add inherited environment, */
addenv(*envp++, NULL); /* some variables change later */
if ((cp = getdef_str("ENV_TZ")))
addenv(*cp == '/' ? tz(cp) : cp, NULL);
if ((cp = getdef_str("ENV_HZ")))
addenv(cp, NULL); /* set the default $HZ, if one */
(void) strcpy (name, "root"); /* KLUDGE!!! */
signal (SIGALRM, catch); /* exit if the timer expires */
alarm (ALARM); /* only wait so long ... */
while (1) { /* repeatedly get login/password pairs */
entry (name, &pwent); /* get entry from password file */
if (pwent.pw_name == (char *) 0) {
/*
* Fail secure
*/
printf(_("No password entry for 'root'\n"));
#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(_("\nType 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 (!cp || !*cp) {
#ifdef USE_SYSLOG
syslog (LOG_INFO, "Normal startup\n");
closelog ();
#endif
puts("\n");
#ifdef TELINIT
execl (PATH_TELINIT, "telinit", RUNLEVEL, (char *) 0);
#endif
exit (0);
} else {
STRFCPY(pass, cp);
strzero(cp);
}
#ifdef AUTH_METHODS
if (pwent.pw_name && pwent.pw_passwd[0] == '@') {
if (pw_auth (pwent.pw_passwd + 1, name, PW_LOGIN, (char *) 0)) {
#ifdef USE_SYSLOG
syslog (LOG_WARN,
"Incorrect root authentication");
#endif
continue;
}
goto auth_done;
}
#endif
if (valid (pass, &pwent)) /* check encrypted passwords ... */
break; /* ... encrypted passwords matched */
#ifdef USE_SYSLOG
syslog (LOG_WARN, "Incorrect root password\n");
#endif
sleep(2);
puts (_("Login incorrect"));
}
#ifdef AUTH_METHODS
auth_done:
#endif
strzero(pass);
alarm (0);
signal (SIGALRM, SIG_DFL);
environ = newenvp; /* make new environment active */
puts(_("Entering System Maintenance Mode\n"));
#ifdef USE_SYSLOG
syslog (LOG_INFO, "System Maintenance Mode\n");
#endif
#if 0 /* do we need all this? we are logging in as root anyway... --marekm */
/*
* Normally there would be a utmp entry for login to mung on
* to get the tty name, date, etc. from. We don't need all that
* stuff because we won't update the utmp or wtmp files. BUT!,
* we do need the tty name so we can set the permissions and
* ownership.
*/
if ((cp = ttyname (0))) { /* found entry in /dev/ */
if (strncmp(cp, "/dev/", 5) == 0)
cp += 5;
strncpy(utent.ut_line, cp, sizeof utent.ut_line);
}
if (getenv ("IFS")) /* don't export user IFS ... */
addenv("IFS= \t\n", NULL); /* ... instead, set a safe IFS */
setup (&pwent, 0); /* set UID, GID, HOME, etc ... */
#endif
#ifdef USE_SYSLOG
closelog ();
#endif
shell (pwent.pw_shell, (char *) 0); /* exec the shell finally. */
/*NOTREACHED*/
return (0);
}