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deb-mbse/unix/pwauth.c

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/*****************************************************************************
*
* $Id$
* Purpose ...............: MBSE BBS Shadow Password Suite
* Original Source .......: Shadow Password Suite
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* Original Copyright ....: Julianne Frances Haugh and others.
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*
*****************************************************************************
* Copyright (C) 1997-2002
*
* Michiel Broek FIDO: 2:280/2802
* Beekmansbos 10
* 1971 BV IJmuiden
* the Netherlands
*
* This file is part of MBSE BBS.
*
* This BBS 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.
*
* MBSE BBS 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 MBSE BBS; see the file COPYING. If not, write to the Free
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* Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*****************************************************************************/
#include "../config.h"
#include <sys/types.h>
#include <signal.h>
#include <fcntl.h>
#include <stdio.h>
#include <errno.h>
#include "mblogin.h"
#include "pwauth.h"
#include "getdef.h"
#include "encrypt.h"
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/* standard password prompt by default */
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static const char *PROMPT = gettext_noop("Password: ");
int wipe_clear_pass = 1;
char *clear_pass = NULL;
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/*
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* pw_auth gets the user's cleartext password and encrypts it
* using the salt in the encrypted password. The results are
* compared.
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*/
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int pw_auth(const char *cipher, const char *user, int reason, const char *input)
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{
char prompt[1024];
char *clear = NULL;
const char *cp;
int retval;
/*
* There are programs for adding and deleting authentication data.
*/
if (reason == PW_ADD || reason == PW_DELETE)
return 0;
/*
* There are even programs for changing the user name ...
*/
if (reason == PW_CHANGE && input != (char *) 0)
return 0;
/*
* WARNING:
*
* When we change a password and we are root, we don't prompt.
* This is so root can change any password without having to
* know it. This is a policy decision that might have to be
* revisited.
*/
if (reason == PW_CHANGE && getuid () == 0)
return 0;
/*
* WARNING:
*
* When we are logging in a user with no ciphertext password,
* we don't prompt for the password or anything. In reality
* the user could just hit <ENTER>, so it doesn't really
* matter.
*/
if (cipher == (char *) 0 || *cipher == '\0')
return 0;
/*
* Prompt for the password as required. FTPD and REXECD both
* get the cleartext password for us.
*/
if (reason != PW_FTP && reason != PW_REXEC && !input) {
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cp = PROMPT;
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snprintf(prompt, sizeof prompt, cp, user);
clear = getpass(prompt);
if (!clear) {
static char c[1];
c[0] = '\0';
clear = c;
}
input = clear;
}
/*
* Convert the cleartext password into a ciphertext string.
* If the two match, the return value will be zero, which is
* SUCCESS. Otherwise we see if SKEY is being used and check
* the results there as well.
*/
retval = strcmp(pw_encrypt(input, cipher), cipher);
/*
* Things like RADIUS authentication may need the password -
* if the external variable wipe_clear_pass is zero, we will
* not wipe it (the caller should wipe clear_pass when it is
* no longer needed). --marekm
*/
clear_pass = clear;
if (wipe_clear_pass && clear && *clear)
strzero(clear);
return retval;
}