blob: 6b7c8bd13ba3793c8e23fc584059c45cba894e3e [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"
Ben Lindstrom551ea372001-06-05 18:56:16 +000026RCSID("$OpenBSD: auth-chall.c,v 1.8 2001/05/18 14:13:28 markus 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{
70 char *resp[1];
71 int res;
Ben Lindstromcf0809d2001-01-19 15:44:10 +000072
Ben Lindstrom551ea372001-06-05 18:56:16 +000073 if (device == NULL)
74 return 0;
75 if (authctxt->kbdintctxt == NULL)
76 return 0;
77 resp[0] = (char *)response;
78 res = device->respond(authctxt->kbdintctxt, 1, resp);
Damien Miller4f9f42a2003-05-10 19:28:02 +100079 if (res == 1) {
80 /* postponed - send a null query just in case */
81 char *name, *info, **prompts;
82 u_int i, numprompts, *echo_on;
83
84 res = device->query(authctxt->kbdintctxt, &name, &info,
85 &numprompts, &prompts, &echo_on);
86 if (res == 0) {
87 for (i = 0; i < numprompts; i++)
88 xfree(prompts[i]);
89 xfree(prompts);
90 xfree(name);
91 xfree(echo_on);
92 xfree(info);
93 }
94 /* if we received more prompts, we're screwed */
95 res = (numprompts != 0);
96 }
Ben Lindstrom551ea372001-06-05 18:56:16 +000097 device->free_ctx(authctxt->kbdintctxt);
98 authctxt->kbdintctxt = NULL;
99 return res ? 0 : 1;
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000100}
Damien Miller4f9f42a2003-05-10 19:28:02 +1000101void
102abandon_challenge_response(Authctxt *authctxt)
103{
104 if (authctxt->kbdintctxt != NULL) {
105 device->free_ctx(authctxt->kbdintctxt);
106 authctxt->kbdintctxt = NULL;
107 }
108}