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 1.9 2003/11/03 09:03:37 djm Exp $");
27RCSID("$FreeBSD: head/crypto/openssh/auth-chall.c 126277 2004-02-26 10:52:33Z des $");
28
29#include "auth.h"
30#include "log.h"
31#include "xmalloc.h"
32
33/* limited protocol v1 interface to kbd-interactive authentication */
34
35extern KbdintDevice *devices[];
36static KbdintDevice *device;
37
38char *
39get_challenge(Authctxt *authctxt)
40{
41 char *challenge, *name, *info, **prompts;
42 u_int i, numprompts;
43 u_int *echo_on;
44
45 device = devices[0]; /* we always use the 1st device for protocol 1 */
46 if (device == NULL)
47 return NULL;
48 if ((authctxt->kbdintctxt = device->init_ctx(authctxt)) == NULL)
49 return NULL;
50 if (device->query(authctxt->kbdintctxt, &name, &info,
51 &numprompts, &prompts, &echo_on)) {
52 device->free_ctx(authctxt->kbdintctxt);
53 authctxt->kbdintctxt = NULL;
54 return NULL;
55 }
56 if (numprompts < 1)
57 fatal("get_challenge: numprompts < 1");
58 challenge = xstrdup(prompts[0]);
59 for (i = 0; i < numprompts; i++)
60 xfree(prompts[i]);
61 xfree(prompts);
62 xfree(name);
63 xfree(echo_on);
64 xfree(info);
65
66 return (challenge);
67}
68int
69verify_response(Authctxt *authctxt, const char *response)
70{
71 char *resp[1], *name, *info, **prompts;
72 u_int i, numprompts, *echo_on;
73 int authenticated = 0;
74
75 if (device == NULL)
76 return 0;
77 if (authctxt->kbdintctxt == NULL)
78 return 0;
79 resp[0] = (char *)response;
80 switch (device->respond(authctxt->kbdintctxt, 1, resp)) {
81 case 0: /* Success */
82 authenticated = 1;
83 break;
84 case 1: /* Postponed - retry with empty query for PAM */
85 if ((device->query(authctxt->kbdintctxt, &name, &info,
86 &numprompts, &prompts, &echo_on)) != 0)
87 break;
88 if (numprompts == 0 &&
89 device->respond(authctxt->kbdintctxt, 0, resp) == 0)
90 authenticated = 1;
91
92 for (i = 0; i < numprompts; i++)
93 xfree(prompts[i]);
94 xfree(prompts);
95 xfree(name);
96 xfree(echo_on);
97 xfree(info);
98 break;
99 }
100 device->free_ctx(authctxt->kbdintctxt);
101 authctxt->kbdintctxt = NULL;
102 return authenticated;
103}
104void
105abandon_challenge_response(Authctxt *authctxt)
106{
107 if (authctxt->kbdintctxt != NULL) {
108 device->free_ctx(authctxt->kbdintctxt);
109 authctxt->kbdintctxt = NULL;
110 }
111}