1 /* $OpenBSD: auth-chall.c,v 1.14 2014/06/24 01:13:21 djm Exp $ */
3 * Copyright (c) 2001 Markus Friedl. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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.
28 #include <sys/types.h>
43 /* limited protocol v1 interface to kbd-interactive authentication */
45 extern KbdintDevice *devices[];
46 static KbdintDevice *device;
47 extern ServerOptions options;
50 get_challenge(Authctxt *authctxt)
52 char *challenge, *name, *info, **prompts;
58 remove_kbdint_device("pam");
61 device = devices[0]; /* we always use the 1st device for protocol 1 */
64 if ((authctxt->kbdintctxt = device->init_ctx(authctxt)) == NULL)
66 if (device->query(authctxt->kbdintctxt, &name, &info,
67 &numprompts, &prompts, &echo_on)) {
68 device->free_ctx(authctxt->kbdintctxt);
69 authctxt->kbdintctxt = NULL;
73 fatal("get_challenge: numprompts < 1");
74 challenge = xstrdup(prompts[0]);
75 for (i = 0; i < numprompts; i++)
85 verify_response(Authctxt *authctxt, const char *response)
87 char *resp[1], *name, *info, **prompts;
88 u_int i, numprompts, *echo_on;
89 int authenticated = 0;
93 if (authctxt->kbdintctxt == NULL)
95 resp[0] = (char *)response;
96 switch (device->respond(authctxt->kbdintctxt, 1, resp)) {
100 case 1: /* Postponed - retry with empty query for PAM */
101 if ((device->query(authctxt->kbdintctxt, &name, &info,
102 &numprompts, &prompts, &echo_on)) != 0)
104 if (numprompts == 0 &&
105 device->respond(authctxt->kbdintctxt, 0, resp) == 0)
108 for (i = 0; i < numprompts; i++)
116 device->free_ctx(authctxt->kbdintctxt);
117 authctxt->kbdintctxt = NULL;
118 return authenticated;
121 abandon_challenge_response(Authctxt *authctxt)
123 if (authctxt->kbdintctxt != NULL) {
124 device->free_ctx(authctxt->kbdintctxt);
125 authctxt->kbdintctxt = NULL;