1 /* $OpenBSD: auth-chall.c,v 1.12 2006/08/03 03:34:41 deraadt Exp $ */
2 /*
3 * Copyright (c) 2001 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 "xmalloc.h"
29 #include "key.h"
30 #include "hostfile.h"
31 #include "auth.h"
32 #include "log.h"
33
34 /* limited protocol v1 interface to kbd-interactive authentication */
35
36 extern KbdintDevice *devices[];
37 static KbdintDevice *device;
38
39 char *
get_challenge(Authctxt * authctxt)40 get_challenge(Authctxt *authctxt)
41 {
42 char *challenge, *name, *info, **prompts;
43 u_int i, numprompts;
44 u_int *echo_on;
45
46 device = devices[0]; /* we always use the 1st device for protocol 1 */
47 if (device == NULL)
48 return NULL;
49 if ((authctxt->kbdintctxt = device->init_ctx(authctxt)) == NULL)
50 return NULL;
51 if (device->query(authctxt->kbdintctxt, &name, &info,
52 &numprompts, &prompts, &echo_on)) {
53 device->free_ctx(authctxt->kbdintctxt);
54 authctxt->kbdintctxt = NULL;
55 return NULL;
56 }
57 if (numprompts < 1)
58 fatal("get_challenge: numprompts < 1");
59 challenge = xstrdup(prompts[0]);
60 for (i = 0; i < numprompts; i++)
61 xfree(prompts[i]);
62 xfree(prompts);
63 xfree(name);
64 xfree(echo_on);
65 xfree(info);
66
67 return (challenge);
68 }
69 int
verify_response(Authctxt * authctxt,const char * response)70 verify_response(Authctxt *authctxt, const char *response)
71 {
72 char *resp[1];
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 if (device->respond(authctxt->kbdintctxt, 1, resp) == 0)
81 authenticated = 1;
82 device->free_ctx(authctxt->kbdintctxt);
83 authctxt->kbdintctxt = NULL;
84 return authenticated;
85 }
86