1 /* $OpenBSD: auth2-kbdint.c,v 1.15 2024/05/17 00:30:23 djm Exp $ */
2 /*
3 * Copyright (c) 2000 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 <sys/types.h>
27
28 #include <stdlib.h>
29 #include <stdio.h>
30 #include <stdarg.h>
31
32 #include "xmalloc.h"
33 #include "packet.h"
34 #include "hostfile.h"
35 #include "auth.h"
36 #include "log.h"
37 #include "misc.h"
38 #include "servconf.h"
39 #include "ssherr.h"
40
41 /* import */
42 extern ServerOptions options;
43 extern struct authmethod_cfg methodcfg_kbdint;
44
45 static int
userauth_kbdint(struct ssh * ssh,const char * method)46 userauth_kbdint(struct ssh *ssh, const char *method)
47 {
48 int r, authenticated = 0;
49 char *lang, *devs;
50
51 if ((r = sshpkt_get_cstring(ssh, &lang, NULL)) != 0 ||
52 (r = sshpkt_get_cstring(ssh, &devs, NULL)) != 0 ||
53 (r = sshpkt_get_end(ssh)) != 0)
54 fatal_fr(r, "parse packet");
55
56 debug("keyboard-interactive devs %s", devs);
57
58 if (options.kbd_interactive_authentication)
59 authenticated = auth2_challenge(ssh, devs);
60
61 free(devs);
62 free(lang);
63 return authenticated;
64 }
65
66 Authmethod method_kbdint = {
67 &methodcfg_kbdint,
68 userauth_kbdint,
69 };
70