blob: 0005aa88bf8ac84ad3e757bfbc77c08d1e47f019 [file] [log] [blame]
Darren Tuckera627d422013-06-02 07:31:17 +10001/* $OpenBSD: auth-chall.c,v 1.13 2013/05/17 00:13:13 djm Exp $ */
Ben Lindstromdb65e8f2001-01-19 04:26:52 +00002/*
Ben Lindstrom92a2e382001-03-05 06:59:27 +00003 * Copyright (c) 2001 Markus Friedl. All rights reserved.
Ben Lindstromdb65e8f2001-01-19 04:26:52 +00004 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
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.
13 *
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.
24 */
25
26#include "includes.h"
Ben Lindstromdb65e8f2001-01-19 04:26:52 +000027
Damien Millerd7834352006-08-05 12:39:39 +100028#include <sys/types.h>
29
Damien Millerded319c2006-09-01 15:38:36 +100030#include <stdarg.h>
31
Damien Millerd7834352006-08-05 12:39:39 +100032#include "xmalloc.h"
33#include "key.h"
34#include "hostfile.h"
Ben Lindstromdb65e8f2001-01-19 04:26:52 +000035#include "auth.h"
Damien Miller60396b02001-02-18 17:01:00 +110036#include "log.h"
Darren Tucker3c660802005-01-20 22:20:50 +110037#include "servconf.h"
Ben Lindstromdb65e8f2001-01-19 04:26:52 +000038
Ben Lindstrom551ea372001-06-05 18:56:16 +000039/* limited protocol v1 interface to kbd-interactive authentication */
40
41extern KbdintDevice *devices[];
42static KbdintDevice *device;
Darren Tucker3c660802005-01-20 22:20:50 +110043extern ServerOptions options;
Ben Lindstrom551ea372001-06-05 18:56:16 +000044
Damien Miller60396b02001-02-18 17:01:00 +110045char *
Ben Lindstrom551ea372001-06-05 18:56:16 +000046get_challenge(Authctxt *authctxt)
Damien Miller60396b02001-02-18 17:01:00 +110047{
Ben Lindstrom551ea372001-06-05 18:56:16 +000048 char *challenge, *name, *info, **prompts;
49 u_int i, numprompts;
50 u_int *echo_on;
Damien Miller60396b02001-02-18 17:01:00 +110051
Darren Tucker3c660802005-01-20 22:20:50 +110052#ifdef USE_PAM
53 if (!options.use_pam)
54 remove_kbdint_device("pam");
55#endif
56
Ben Lindstrom551ea372001-06-05 18:56:16 +000057 device = devices[0]; /* we always use the 1st device for protocol 1 */
58 if (device == NULL)
59 return NULL;
60 if ((authctxt->kbdintctxt = device->init_ctx(authctxt)) == NULL)
61 return NULL;
62 if (device->query(authctxt->kbdintctxt, &name, &info,
63 &numprompts, &prompts, &echo_on)) {
64 device->free_ctx(authctxt->kbdintctxt);
65 authctxt->kbdintctxt = NULL;
66 return NULL;
Damien Miller60396b02001-02-18 17:01:00 +110067 }
Ben Lindstrom551ea372001-06-05 18:56:16 +000068 if (numprompts < 1)
69 fatal("get_challenge: numprompts < 1");
70 challenge = xstrdup(prompts[0]);
71 for (i = 0; i < numprompts; i++)
Darren Tuckera627d422013-06-02 07:31:17 +100072 free(prompts[i]);
73 free(prompts);
74 free(name);
75 free(echo_on);
76 free(info);
Damien Miller60396b02001-02-18 17:01:00 +110077
Ben Lindstrom551ea372001-06-05 18:56:16 +000078 return (challenge);
Damien Miller60396b02001-02-18 17:01:00 +110079}
Ben Lindstrom551ea372001-06-05 18:56:16 +000080int
81verify_response(Authctxt *authctxt, const char *response)
82{
Damien Miller3e8f41e2003-11-17 21:09:50 +110083 char *resp[1], *name, *info, **prompts;
84 u_int i, numprompts, *echo_on;
85 int authenticated = 0;
Ben Lindstromcf0809d2001-01-19 15:44:10 +000086
Ben Lindstrom551ea372001-06-05 18:56:16 +000087 if (device == NULL)
88 return 0;
89 if (authctxt->kbdintctxt == NULL)
90 return 0;
91 resp[0] = (char *)response;
Damien Miller3e8f41e2003-11-17 21:09:50 +110092 switch (device->respond(authctxt->kbdintctxt, 1, resp)) {
93 case 0: /* Success */
94 authenticated = 1;
95 break;
96 case 1: /* Postponed - retry with empty query for PAM */
97 if ((device->query(authctxt->kbdintctxt, &name, &info,
98 &numprompts, &prompts, &echo_on)) != 0)
99 break;
Damien Millera8e06ce2003-11-21 23:48:55 +1100100 if (numprompts == 0 &&
Damien Miller3e8f41e2003-11-17 21:09:50 +1100101 device->respond(authctxt->kbdintctxt, 0, resp) == 0)
102 authenticated = 1;
Damien Miller4f9f42a2003-05-10 19:28:02 +1000103
Damien Miller3e8f41e2003-11-17 21:09:50 +1100104 for (i = 0; i < numprompts; i++)
Darren Tuckerf60845f2013-06-02 08:07:31 +1000105 free(prompts[i]);
106 free(prompts);
107 free(name);
108 free(echo_on);
109 free(info);
Damien Miller3e8f41e2003-11-17 21:09:50 +1100110 break;
Damien Miller4f9f42a2003-05-10 19:28:02 +1000111 }
Ben Lindstrom551ea372001-06-05 18:56:16 +0000112 device->free_ctx(authctxt->kbdintctxt);
113 authctxt->kbdintctxt = NULL;
Damien Miller3e8f41e2003-11-17 21:09:50 +1100114 return authenticated;
Ben Lindstromdb65e8f2001-01-19 04:26:52 +0000115}
Damien Miller4f9f42a2003-05-10 19:28:02 +1000116void
117abandon_challenge_response(Authctxt *authctxt)
118{
119 if (authctxt->kbdintctxt != NULL) {
120 device->free_ctx(authctxt->kbdintctxt);
121 authctxt->kbdintctxt = NULL;
122 }
123}