auth-chall.c revision 98941 
1/*
2 * Copyright (c) 2001 Markus Friedl.  All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23 */
24
25#include "includes.h"
26RCSID("$OpenBSD: auth-chall.c,v 1.8 2001/05/18 14:13:28 markus Exp $");
27
28#include "auth.h"
29#include "log.h"
30#include "xmalloc.h"
31
32/* limited protocol v1 interface to kbd-interactive authentication */
33
34extern KbdintDevice *devices[];
35static KbdintDevice *device;
36
37char *
38get_challenge(Authctxt *authctxt)
39{
40	char *challenge, *name, *info, **prompts;
41	u_int i, numprompts;
42	u_int *echo_on;
43
44	device = devices[0]; /* we always use the 1st device for protocol 1 */
45	if (device == NULL)
46		return NULL;
47	if ((authctxt->kbdintctxt = device->init_ctx(authctxt)) == NULL)
48		return NULL;
49	if (device->query(authctxt->kbdintctxt, &name, &info,
50	    &numprompts, &prompts, &echo_on)) {
51		device->free_ctx(authctxt->kbdintctxt);
52		authctxt->kbdintctxt = NULL;
53		return NULL;
54	}
55	if (numprompts < 1)
56		fatal("get_challenge: numprompts < 1");
57	challenge = xstrdup(prompts[0]);
58	for (i = 0; i < numprompts; i++)
59		xfree(prompts[i]);
60	xfree(prompts);
61	xfree(name);
62	xfree(echo_on);
63	xfree(info);
64
65	return (challenge);
66}
67int
68verify_response(Authctxt *authctxt, const char *response)
69{
70	char *resp[1];
71	int res;
72
73	if (device == NULL)
74		return 0;
75	if (authctxt->kbdintctxt == NULL)
76		return 0;
77	resp[0] = (char *)response;
78	res = device->respond(authctxt->kbdintctxt, 1, resp);
79	device->free_ctx(authctxt->kbdintctxt);
80	authctxt->kbdintctxt = NULL;
81	return res ? 0 : 1;
82}
83