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 $");
34 /* limited protocol v1 interface to kbd-interactive authentication */
36 extern KbdintDevice *devices[];
37 static KbdintDevice *device;
38 extern ServerOptions options;
41 get_challenge(Authctxt *authctxt)
43 char *challenge, *name, *info, **prompts;
49 remove_kbdint_device("pam");
52 device = devices[0]; /* we always use the 1st device for protocol 1 */
55 if ((authctxt->kbdintctxt = device->init_ctx(authctxt)) == NULL)
57 if (device->query(authctxt->kbdintctxt, &name, &info,
58 &numprompts, &prompts, &echo_on)) {
59 device->free_ctx(authctxt->kbdintctxt);
60 authctxt->kbdintctxt = NULL;
64 fatal("get_challenge: numprompts < 1");
65 challenge = xstrdup(prompts[0]);
66 for (i = 0; i < numprompts; i++)
76 verify_response(Authctxt *authctxt, const char *response)
78 char *resp[1], *name, *info, **prompts;
79 u_int i, numprompts, *echo_on;
80 int authenticated = 0;
84 if (authctxt->kbdintctxt == NULL)
86 resp[0] = (char *)response;
87 switch (device->respond(authctxt->kbdintctxt, 1, resp)) {
91 case 1: /* Postponed - retry with empty query for PAM */
92 if ((device->query(authctxt->kbdintctxt, &name, &info,
93 &numprompts, &prompts, &echo_on)) != 0)
95 if (numprompts == 0 &&
96 device->respond(authctxt->kbdintctxt, 0, resp) == 0)
99 for (i = 0; i < numprompts; i++)
107 device->free_ctx(authctxt->kbdintctxt);
108 authctxt->kbdintctxt = NULL;
109 return authenticated;
112 abandon_challenge_response(Authctxt *authctxt)
114 if (authctxt->kbdintctxt != NULL) {
115 device->free_ctx(authctxt->kbdintctxt);
116 authctxt->kbdintctxt = NULL;