165 lines
4.9 KiB
C
165 lines
4.9 KiB
C
/*
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* Author: Tatu Ylonen <ylo@cs.hut.fi>
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* Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
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* All rights reserved
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* Password authentication. This file contains the functions to check whether
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* the password is valid for the user.
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*
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* As far as I am concerned, the code I have written for this software
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* can be used freely for any purpose. Any derived versions of this
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* software must be clearly marked as such, and if the derived work is
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* incompatible with the protocol description in the RFC file, it must be
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* called by a name other than "ssh" or "Secure Shell".
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*
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* Copyright (c) 1999 Dug Song. All rights reserved.
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* Copyright (c) 2000 Markus Friedl. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "includes.h"
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RCSID("$OpenBSD: auth-passwd.c,v 1.29 2003/08/26 09:58:43 markus Exp $");
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RCSID("$FreeBSD$");
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#include "packet.h"
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#include "log.h"
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#include "servconf.h"
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#include "auth.h"
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#ifdef WITH_AIXAUTHENTICATE
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# include "buffer.h"
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# include "canohost.h"
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extern Buffer loginmsg;
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#endif
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extern ServerOptions options;
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/*
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* Tries to authenticate the user using password. Returns true if
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* authentication succeeds.
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*/
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int
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auth_password(Authctxt *authctxt, const char *password)
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{
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struct passwd * pw = authctxt->pw;
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int ok = authctxt->valid;
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/* deny if no user. */
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if (pw == NULL)
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return 0;
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#ifndef HAVE_CYGWIN
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if (pw && pw->pw_uid == 0 && options.permit_root_login != PERMIT_YES)
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ok = 0;
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#endif
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if (*password == '\0' && options.permit_empty_passwd == 0)
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return 0;
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#if defined(HAVE_OSF_SIA)
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return auth_sia_password(authctxt, password) && ok;
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#else
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# ifdef KRB5
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if (options.kerberos_authentication == 1) {
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int ret = auth_krb5_password(authctxt, password);
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if (ret == 1 || ret == 0)
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return ret && ok;
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/* Fall back to ordinary passwd authentication. */
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}
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# endif
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# ifdef HAVE_CYGWIN
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if (is_winnt) {
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HANDLE hToken = cygwin_logon_user(pw, password);
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if (hToken == INVALID_HANDLE_VALUE)
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return 0;
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cygwin_set_impersonation_token(hToken);
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return ok;
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}
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# endif
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# ifdef WITH_AIXAUTHENTICATE
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{
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char *authmsg = NULL;
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int reenter = 1;
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int authsuccess = 0;
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if (authenticate(pw->pw_name, password, &reenter,
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&authmsg) == 0 && ok) {
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char *msg;
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char *host =
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(char *)get_canonical_hostname(options.use_dns);
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authsuccess = 1;
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aix_remove_embedded_newlines(authmsg);
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debug3("AIX/authenticate succeeded for user %s: %.100s",
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pw->pw_name, authmsg);
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/* No pty yet, so just label the line as "ssh" */
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aix_setauthdb(authctxt->user);
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if (loginsuccess(authctxt->user, host, "ssh",
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&msg) == 0) {
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if (msg != NULL) {
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debug("%s: msg %s", __func__, msg);
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buffer_append(&loginmsg, msg,
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strlen(msg));
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xfree(msg);
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}
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}
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} else {
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debug3("AIX/authenticate failed for user %s: %.100s",
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pw->pw_name, authmsg);
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}
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if (authmsg != NULL)
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xfree(authmsg);
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return authsuccess;
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}
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# endif
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# ifdef BSD_AUTH
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if (auth_userokay(pw->pw_name, authctxt->style, "auth-ssh",
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(char *)password) == 0)
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return 0;
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else
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return ok;
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# else
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{
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/* Just use the supplied fake password if authctxt is invalid */
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char *pw_password = authctxt->valid ? shadow_pw(pw) : pw->pw_passwd;
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/* Check for users with no password. */
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if (strcmp(pw_password, "") == 0 && strcmp(password, "") == 0)
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return ok;
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else {
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/* Encrypt the candidate password using the proper salt. */
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char *encrypted_password = xcrypt(password,
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(pw_password[0] && pw_password[1]) ? pw_password : "xx");
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/*
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* Authentication is accepted if the encrypted passwords
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* are identical.
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*/
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return (strcmp(encrypted_password, pw_password) == 0) && ok;
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}
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}
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# endif
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#endif /* !HAVE_OSF_SIA */
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}
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