1/*	$NetBSD: auth2-krb5.c,v 1.10 2022/02/23 19:07:20 christos Exp $	*/
2/*
3 * Copyright (c) 2003 Markus Friedl.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
16 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
17 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
18 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
19 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
20 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
21 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
23 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "includes.h"
27__RCSID("$NetBSD: auth2-krb5.c,v 1.10 2022/02/23 19:07:20 christos Exp $");
28
29#include <krb5.h>
30#include <stdio.h>
31
32#include "ssh2.h"
33#include "xmalloc.h"
34#include "packet.h"
35#include "log.h"
36#include "hostfile.h"
37#include "auth.h"
38#ifdef GSSAPI
39#include "ssh-gss.h"
40#endif
41#include "ssherr.h"
42#include "monitor_wrap.h"
43#include "misc.h"
44#include "servconf.h"
45
46/* import */
47extern ServerOptions options;
48
49static int
50userauth_kerberos(struct ssh *ssh, const char *method)
51{
52	krb5_data tkt, reply;
53	size_t dlen;
54	char *passwd;
55	char *client = NULL;
56	int authenticated = 0, r;
57
58	if ((r = sshpkt_get_cstring(ssh, &passwd, &dlen)) != 0 ||
59	     (r = sshpkt_get_end(ssh)) != 0)
60		 fatal("%s: %s", __func__, ssh_err(r));
61
62	tkt.data = passwd;
63	tkt.length = dlen;
64	if (PRIVSEP(auth_krb5(ssh, &tkt, &client, &reply))) {
65		authenticated = 1;
66		if (reply.length)
67			free(reply.data);
68	}
69	if (client)
70		free(client);
71	free(tkt.data);
72	return (authenticated);
73}
74
75Authmethod method_kerberos = {
76	"kerberos-2@ssh.com",
77	NULL,
78	userauth_kerberos,
79	&options.kerberos_authentication
80};
81