84 lines
3.2 KiB
C
84 lines
3.2 KiB
C
/*
|
|
* 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 1.20 2001/01/21 19:05:42 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 == 2)
|
|
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);
|
|
}
|