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/* $Id: authenticated.c,v 1.6 2001/04/24 17:18:55 japh Exp $
* authenticated.c -- fancylogin user-authentication.
*
* fancylogin uses ncurses to display a colorful login-
* screen with input-masks.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
* Written by Richard Bergmair.
* ANSI-conformance testing by Andreas Krennmair
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <pwd.h>
#include <time.h>
#ifdef HAVE_SHADOW_H
# include <shadow.h>
#endif
#include "definitions.h"
#include "limits.h"
#include "log_message.h"
#include "login_permissions.h"
#include "md5crypt.h"
#include "pam_login.h"
#include "environment.h"
#define __AUTHENTICATED__ 0
#define __WRONG_PASSWORD__ 1
#define __USER_EXPIRED__ 2
#define __CANT_FETCH_SPWD__ 3
static int check_password(char *crypted, char *clear);
static int auth_normal(struct passwd *passwd, char *clear);
static int auth_shadow(char * username, char *clear);
struct passwd *authenticated(char *username, char *password, char *rmthost);
/*****************************************************************************/
/* check_password: compares the given crypted password with the encrypted */
/* cleartextpassword. */
/*****************************************************************************/
static int
check_password (char *crypted, char *clear)
{
/*
* crypt the cleartext-password
* using the salt-string, and finally
* see if it's the same as entered
*
* to put it simply
*
* return (strcmp ((char *)crypt(clear, passwd->pw_passwd),
* passwd->pw_passwd) == 0);
*/
#ifdef ALLOW_DES
return (strcmp ((char *)crypt(clear, crypted), crypted)==0);
#else
# ifdef ALLOW_MD5
return (strcmp ((char *)md5crypt(clear,crypted), crypted)==0);
# else
# error "Either DES or MD5 must be allowed"
# endif
#endif
#ifdef ALLOW_MD5
#ifdef ALLOW_DES
if ((strcmp ((char *)crypt(clear, crypted), crypted) != 0))
return (strcmp ((char *)md5crypt(clear, crypted),crypted) == 0);
else
return TRUE;
#endif
#endif
}
#ifdef ALLOW_NORMAL
/*****************************************************************************/
/* auth_normal: tries to authenticate the given password from passwd */
/* (passwd) and the password entered by the user (password) */
/* using standard-authentication. */
/*****************************************************************************/
static int
auth_normal (struct passwd *passwd, char *clear)
{
if (check_password(passwd->pw_passwd, clear))
return __AUTHENTICATED__;
else
return __WRONG_PASSWORD__;
}
#endif
#ifdef HAVE_SHADOW_H
/*****************************************************************************/
/* auth_shadow: tries to authenticate the given password from passwd */
/* (passwd) and the password entered by the user (password) */
/* using shadow-authentication */
/*****************************************************************************/
static int
auth_shadow (char * username, char *clear)
{
/*
* same as auth_normal, but before
* verifying the password, we first get it
* from shadow
*/
struct spwd *entry;
time_t now;
entry = getspnam (username);
/* entry will usually be NULL when the program runs with UID!=0.
if (entry==NULL)
return __CANT_FETCH_SPWD__;
/* what time is it? */
time (&now);
/* has the account expired? */
if ((entry->sp_expire != -1) && ((unsigned long)now/(60*60*24) > entry->sp_expire))
{
char errormessage[__MAX_STR_LEN__];
sprintf (errormessage, "the account for %s has expired",
username);
log_message (40000, errormessage);
log_message (49999, errormessage);
return __USER_EXPIRED__;
}
if (check_password(entry->sp_pwdp, clear))
return __AUTHENTICATED__;
else
return __WRONG_PASSWORD__;
}
#endif
/*****************************************************************************/
/* authenticated: determines whether username and password are correct */
/* returns NULL if not authenticated, else return the user- */
/* structure. */
/*****************************************************************************/
struct passwd *
authenticated (char *username, char *password, char *rmthost)
{
struct passwd *passwd_entry;
char errormessage [__MAX_STR_LEN__];
int x;
int rc;
/* has the user entered a name? */
if (username[0]=='\0')
return NULL;
/* is the user known to the system? */
if ((passwd_entry = getpwnam (username)) == NULL)
{
sprintf (errormessage, "%s is not known to the system!", username);
log_message (49998, errormessage);
log_message (49999, errormessage);
return NULL;
}
/*
* is root trying to log on to a terminal, he is not allowed
* to log on to ?
*/
#ifdef SUPPORT_SECURETTY
if ((passwd_entry->pw_uid==0) && !(root_allowed()))
{
sprintf (errormessage, "accorting to /etc/securetty root is not allowed to log here");
log_message (40000, errormessage);
log_message (49999, errormessage);
return NULL;
}
#endif
/*
* is the user locked?
*/
if ((passwd_entry->pw_passwd[0])=='!')
{
sprintf (errormessage, "%s is locked", passwd_entry->pw_name);
log_message (40000+passwd_entry->pw_uid, errormessage);
log_message (49999, errormessage);
return NULL;
}
/*
* Is the user allowed to log on to this terminal
* at this time, according to /etc/usertty?
*/
#ifdef SUPPORT_USERTTY
if ((passwd_entry->pw_uid != 0) && (!(user_allowed (passwd_entry, rmthost))))
{
sprintf (errormessage, "according to /etc/usertty %s is not allowed to log on here.", passwd_entry->pw_name);
log_message (40000+passwd_entry->pw_uid, errormessage);
log_message (49999, errormessage);
return NULL;
}
#endif
/*
* does the user have a password?
*/
if (passwd_entry->pw_passwd[0]=='\0')
{
sprintf (errormessage, "%s logged in", passwd_entry->pw_name);
log_message (30000+passwd_entry->pw_uid, errormessage);
log_message (39999, errormessage);
return passwd_entry;
}
/*
* can the user be authenticated to the system?
*/
#ifdef HAVE_LIBPAM
rc=pam_authenticatepam();
if (rc!=PAM_SUCCESS)
return NULL;
#endif
if (strcmp(passwd_entry->pw_passwd,"x")==0) /* Do we use shadow? */
{
#ifdef HAVE_SHADOW_H
switch (auth_shadow (username, password))
{
case __AUTHENTICATED__:
sprintf (errormessage, "%s logged in", passwd_entry->pw_name);
log_message (30000+passwd_entry->pw_uid, errormessage);
log_message (39999, errormessage);
return passwd_entry;
case __USER_EXPIRED__:
sprintf (errormessage, "%s expired",
passwd_entry->pw_name);
log_message (40000+passwd_entry->pw_uid, errormessage);
log_message (49999, errormessage);
break;
case __CANT_FETCH_SPWD__:
sprintf(errormessage,"couldn't fetch struct spwd for %s."
" Maybe not running as root?",
passwd_entry->pw_name);
log_message(40000+passwd_entry->pw_uid, errormessage);
log_message(49999, errormessage);
}
return NULL;
#endif
}
else
{
#ifdef ALLOW_NORMAL
if (auth_normal (passwd_entry, password)==__AUTHENTICATED__)
{
sprintf (errormessage, "%s logged in", passwd_entry->pw_name);
log_message (30000+passwd_entry->pw_uid, errormessage);
log_message (39999, errormessage);
return passwd_entry;
}
else
{
/* Log that the authentication failed */
sprintf (errormessage, "%s entered a wrong password",
passwd_entry->pw_name);
log_message (40000+passwd_entry->pw_uid, errormessage);
log_message (49999, errormessage);
return NULL;
}
#endif
}
return NULL;
}
/*****************************************************************************/
/* (c) Copyright 1999-2000 Richard Bergmair, 2000-2001 Andreas Krennmair */
/*****************************************************************************/
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