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/*
* Author: Tatu Ylonen <ylo@cs.hut.fi>
* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
* All rights reserved
* Password authentication. This file contains the functions to check whether
* the password is valid for the user.
*
* As far as I am concerned, the code I have written for this software
* can be used freely for any purpose. Any derived versions of this
* software must be clearly marked as such, and if the derived work is
* incompatible with the protocol description in the RFC file, it must be
* called by a name other than "ssh" or "Secure Shell".
*
* Copyright (c) 1999 Dug Song. All rights reserved.
* Copyright (c) 2000 Markus Friedl. 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.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 THE AUTHOR 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 "includes.h"
RCSID("$OpenBSD: auth-passwd.c,v 1.21 2001/02/12 16:16:23 markus Exp $");
#include "packet.h"
#include "xmalloc.h"
#include "log.h"
#include "servconf.h"
#include "auth.h"
/*
* Tries to authenticate the user using password. Returns true if
* authentication succeeds.
*/
int
auth_password(struct passwd * pw, const char *password)
{
extern ServerOptions options;
char *encrypted_password;
/* deny if no user. */
if (pw == NULL)
return 0;
if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES)
return 0;
if (*password == '\0' && options.permit_empty_passwd == 0)
return 0;
#ifdef KRB4
if (options.kerberos_authentication == 1) {
int ret = auth_krb4_password(pw, password);
if (ret == 1 || ret == 0)
return ret;
/* Fall back to ordinary passwd authentication. */
}
#endif
/* Check for users with no password. */
if (strcmp(password, "") == 0 && strcmp(pw->pw_passwd, "") == 0)
return 1;
/* Encrypt the candidate password using the proper salt. */
encrypted_password = crypt(password,
(pw->pw_passwd[0] && pw->pw_passwd[1]) ? pw->pw_passwd : "xx");
/* Authentication is accepted if the encrypted passwords are identical. */
return (strcmp(encrypted_password, pw->pw_passwd) == 0);
}
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