blob: a9d314dd2a659e83acc7397189ee8ad2239385f0 [file] [log] [blame]
Ben Lindstromdb65e8f2001-01-19 04:26:52 +00001/*
Ben Lindstrom92a2e382001-03-05 06:59:27 +00002 * Copyright (c) 2001 Markus Friedl. All rights reserved.
Ben Lindstromdb65e8f2001-01-19 04:26:52 +00003 *
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"
Damien Miller3e8f41e2003-11-17 21:09:50 +110026RCSID("$OpenBSD: auth-chall.c,v 1.9 2003/11/03 09:03:37 djm Exp $");
Ben Lindstromdb65e8f2001-01-19 04:26:52 +000027
Ben Lindstromdb65e8f2001-01-19 04:26:52 +000028#include "auth.h"
Damien Miller60396b02001-02-18 17:01:00 +110029#include "log.h"
Ben Lindstrom551ea372001-06-05 18:56:16 +000030#include "xmalloc.h"
Ben Lindstromdb65e8f2001-01-19 04:26:52 +000031
Ben Lindstrom551ea372001-06-05 18:56:16 +000032/* limited protocol v1 interface to kbd-interactive authentication */
33
34extern KbdintDevice *devices[];
35static KbdintDevice *device;
36
Damien Miller60396b02001-02-18 17:01:00 +110037char *
Ben Lindstrom551ea372001-06-05 18:56:16 +000038get_challenge(Authctxt *authctxt)
Damien Miller60396b02001-02-18 17:01:00 +110039{
Ben Lindstrom551ea372001-06-05 18:56:16 +000040 char *challenge, *name, *info, **prompts;
41 u_int i, numprompts;
42 u_int *echo_on;
Damien Miller60396b02001-02-18 17:01:00 +110043
Ben Lindstrom551ea372001-06-05 18:56:16 +000044 device = devices[0]; /* we always use the 1st device for protocol 1 */
45 if (device == NULL)
46 return NULL;
47 if ((authctxt->kbdintctxt = device->init_ctx(authctxt)) == NULL)
48 return NULL;
49 if (device->query(authctxt->kbdintctxt, &name, &info,
50 &numprompts, &prompts, &echo_on)) {
51 device->free_ctx(authctxt->kbdintctxt);
52 authctxt->kbdintctxt = NULL;
53 return NULL;
Damien Miller60396b02001-02-18 17:01:00 +110054 }
Ben Lindstrom551ea372001-06-05 18:56:16 +000055 if (numprompts < 1)
56 fatal("get_challenge: numprompts < 1");
57 challenge = xstrdup(prompts[0]);
58 for (i = 0; i < numprompts; i++)
59 xfree(prompts[i]);
60 xfree(prompts);
61 xfree(name);
62 xfree(echo_on);
63 xfree(info);
Damien Miller60396b02001-02-18 17:01:00 +110064
Ben Lindstrom551ea372001-06-05 18:56:16 +000065 return (challenge);
Damien Miller60396b02001-02-18 17:01:00 +110066}
Ben Lindstrom551ea372001-06-05 18:56:16 +000067int
68verify_response(Authctxt *authctxt, const char *response)
69{
Damien Miller3e8f41e2003-11-17 21:09:50 +110070 char *resp[1], *name, *info, **prompts;
71 u_int i, numprompts, *echo_on;
72 int authenticated = 0;
Ben Lindstromcf0809d2001-01-19 15:44:10 +000073
Ben Lindstrom551ea372001-06-05 18:56:16 +000074 if (device == NULL)
75 return 0;
76 if (authctxt->kbdintctxt == NULL)
77 return 0;
78 resp[0] = (char *)response;
Damien Miller3e8f41e2003-11-17 21:09:50 +110079 switch (device->respond(authctxt->kbdintctxt, 1, resp)) {
80 case 0: /* Success */
81 authenticated = 1;
82 break;
83 case 1: /* Postponed - retry with empty query for PAM */
84 if ((device->query(authctxt->kbdintctxt, &name, &info,
85 &numprompts, &prompts, &echo_on)) != 0)
86 break;
Damien Millera8e06ce2003-11-21 23:48:55 +110087 if (numprompts == 0 &&
Damien Miller3e8f41e2003-11-17 21:09:50 +110088 device->respond(authctxt->kbdintctxt, 0, resp) == 0)
89 authenticated = 1;
Damien Miller4f9f42a2003-05-10 19:28:02 +100090
Damien Miller3e8f41e2003-11-17 21:09:50 +110091 for (i = 0; i < numprompts; i++)
92 xfree(prompts[i]);
93 xfree(prompts);
94 xfree(name);
95 xfree(echo_on);
96 xfree(info);
97 break;
Damien Miller4f9f42a2003-05-10 19:28:02 +100098 }
Ben Lindstrom551ea372001-06-05 18:56:16 +000099 device->free_ctx(authctxt->kbdintctxt);
100 authctxt->kbdintctxt = NULL;
Damien Miller3e8f41e2003-11-17 21:09:50 +1100101 return authenticated;
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000102}
Damien Miller4f9f42a2003-05-10 19:28:02 +1000103void
104abandon_challenge_response(Authctxt *authctxt)
105{
106 if (authctxt->kbdintctxt != NULL) {
107 device->free_ctx(authctxt->kbdintctxt);
108 authctxt->kbdintctxt = NULL;
109 }
110}