2 * Copyright (c) 2001 Markus Friedl. All rights reserved.
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
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.
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.
26 RCSID("$OpenBSD: auth-chall.c,v 1.9 2003/11/03 09:03:37 djm Exp $");
33 /* limited protocol v1 interface to kbd-interactive authentication */
35 extern KbdintDevice *devices[];
36 static KbdintDevice *device;
37 extern ServerOptions options;
40 get_challenge(Authctxt *authctxt)
42 char *challenge, *name, *info, **prompts;
48 remove_kbdint_device("pam");
51 device = devices[0]; /* we always use the 1st device for protocol 1 */
54 if ((authctxt->kbdintctxt = device->init_ctx(authctxt)) == NULL)
56 if (device->query(authctxt->kbdintctxt, &name, &info,
57 &numprompts, &prompts, &echo_on)) {
58 device->free_ctx(authctxt->kbdintctxt);
59 authctxt->kbdintctxt = NULL;
63 fatal("get_challenge: numprompts < 1");
64 challenge = xstrdup(prompts[0]);
65 for (i = 0; i < numprompts; i++)
75 verify_response(Authctxt *authctxt, const char *response)
77 char *resp[1], *name, *info, **prompts;
78 u_int i, numprompts, *echo_on;
79 int authenticated = 0;
83 if (authctxt->kbdintctxt == NULL)
85 resp[0] = (char *)response;
86 switch (device->respond(authctxt->kbdintctxt, 1, resp)) {
90 case 1: /* Postponed - retry with empty query for PAM */
91 if ((device->query(authctxt->kbdintctxt, &name, &info,
92 &numprompts, &prompts, &echo_on)) != 0)
94 if (numprompts == 0 &&
95 device->respond(authctxt->kbdintctxt, 0, resp) == 0)
98 for (i = 0; i < numprompts; i++)
106 device->free_ctx(authctxt->kbdintctxt);
107 authctxt->kbdintctxt = NULL;
108 return authenticated;
111 abandon_challenge_response(Authctxt *authctxt)
113 if (authctxt->kbdintctxt != NULL) {
114 device->free_ctx(authctxt->kbdintctxt);
115 authctxt->kbdintctxt = NULL;