shadow/src/sulogin.c

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/*
* 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>
#ident "$Id: sulogin.c,v 1.26 2006/05/12 22:32:14 kloczek Exp $"
#include <fcntl.h>
#include <pwd.h>
#include <signal.h>
#include <stdio.h>
#include "defines.h"
#include "getdef.h"
#include "prototypes.h"
#include "pwauth.h"
#include "exitcodes.h"
/*
* Global variables
*/
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 RETSIGTYPE catch_signals (int);
static RETSIGTYPE catch_signals (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;
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
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
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! */
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 */
#ifndef USE_PAM
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 */
#endif /* !USE_PAM */
(void) strcpy (name, "root"); /* KLUDGE!!! */
signal (SIGALRM, catch_signals); /* exit if the timer expires */
alarm (ALARM); /* only wait so long ... */
while (1) { /* repeatedly get login/password pairs */
pw_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 (_
("\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 (!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);
}
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"));
}
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
#ifdef USE_SYSLOG
closelog ();
#endif
/* exec the shell finally. */
err = shell (pwent.pw_shell, (char *) 0, environ);
exit (err == ENOENT ? E_CMD_NOTFOUND : E_CMD_NOEXEC);
/*NOTREACHED*/ return (0);
}