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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 1.30 2003/11/04 08:54:09 djm Exp $");
#include "packet.h"
#include "log.h"
#include "servconf.h"
#include "auth.h"
#ifdef WITH_AIXAUTHENTICATE
# include "buffer.h"
# include "canohost.h"
extern Buffer loginmsg;
#endif
extern ServerOptions options;
/*
* Tries to authenticate the user using password. Returns true if
* authentication succeeds.
*/
int
auth_password(Authctxt *authctxt, const char *password)
{
struct passwd * pw = authctxt->pw;
int ok = authctxt->valid;
#ifndef HAVE_CYGWIN
if (pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES)
ok = 0;
#endif
if (*password == '\0' && options.permit_empty_passwd == 0)
return 0;
#if defined(HAVE_OSF_SIA)
return auth_sia_password(authctxt, password) && ok;
#else
# ifdef KRB5
if (options.kerberos_authentication == 1) {
int ret = auth_krb5_password(authctxt, password);
if (ret == 1 || ret == 0)
return ret && ok;
/* Fall back to ordinary passwd authentication. */
}
# endif
# ifdef HAVE_CYGWIN
if (is_winnt) {
HANDLE hToken = cygwin_logon_user(pw, password);
if (hToken == INVALID_HANDLE_VALUE)
return 0;
cygwin_set_impersonation_token(hToken);
return ok;
}
# endif
# ifdef WITH_AIXAUTHENTICATE
{
char *authmsg = NULL;
int reenter = 1;
int authsuccess = 0;
if (authenticate(pw->pw_name, password, &reenter,
&authmsg) == 0 && ok) {
char *msg;
char *host =
(char *)get_canonical_hostname(options.use_dns);
authsuccess = 1;
aix_remove_embedded_newlines(authmsg);
debug3("AIX/authenticate succeeded for user %s: %.100s",
pw->pw_name, authmsg);
/* No pty yet, so just label the line as "ssh" */
aix_setauthdb(authctxt->user);
if (loginsuccess(authctxt->user, host, "ssh",
&msg) == 0) {
if (msg != NULL) {
debug("%s: msg %s", __func__, msg);
buffer_append(&loginmsg, msg,
strlen(msg));
xfree(msg);
}
}
} else {
debug3("AIX/authenticate failed for user %s: %.100s",
pw->pw_name, authmsg);
}
if (authmsg != NULL)
xfree(authmsg);
return authsuccess;
}
# endif
# ifdef BSD_AUTH
if (auth_userokay(pw->pw_name, authctxt->style, "auth-ssh",
(char *)password) == 0)
return 0;
else
return ok;
# else
{
/* Just use the supplied fake password if authctxt is invalid */
char *pw_password = authctxt->valid ? shadow_pw(pw) : pw->pw_passwd;
/* Check for users with no password. */
if (strcmp(pw_password, "") == 0 && strcmp(password, "") == 0)
return ok;
else {
/* Encrypt the candidate password using the proper salt. */
char *encrypted_password = xcrypt(password,
(pw_password[0] && pw_password[1]) ? pw_password : "xx");
/*
* Authentication is accepted if the encrypted passwords
* are identical.
*/
return (strcmp(encrypted_password, pw_password) == 0) && ok;
}
}
# endif
#endif /* !HAVE_OSF_SIA */
}
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