auth-chall.c revision 76260 
1/*
2 * Copyright (c) 2001 Markus Friedl.  All rights reserved.
3 *
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"
26RCSID("$OpenBSD: auth-chall.c,v 1.7 2001/04/05 10:42:47 markus Exp $");
27
28#include "auth.h"
29#include "log.h"
30
31#ifdef BSD_AUTH
32char *
33get_challenge(Authctxt *authctxt, char *devs)
34{
35	char *challenge;
36
37	if (authctxt->as != NULL) {
38		debug2("try reuse session");
39		challenge = auth_getitem(authctxt->as, AUTHV_CHALLENGE);
40		if (challenge != NULL) {
41			debug2("reuse bsd auth session");
42			return challenge;
43		}
44		auth_close(authctxt->as);
45		authctxt->as = NULL;
46	}
47	debug2("new bsd auth session");
48	if (devs == NULL || strlen(devs) == 0)
49		devs = authctxt->style;
50	debug3("bsd auth: devs %s", devs ? devs : "<default>");
51	authctxt->as = auth_userchallenge(authctxt->user, devs, "auth-ssh",
52	    &challenge);
53	if (authctxt->as == NULL)
54		return NULL;
55	debug2("get_challenge: <%s>", challenge ? challenge : "EMPTY");
56	return challenge;
57}
58int
59verify_response(Authctxt *authctxt, char *response)
60{
61	int authok;
62
63	if (authctxt->as == 0)
64		error("verify_response: no bsd auth session");
65	authok = auth_userresponse(authctxt->as, response, 0);
66	authctxt->as = NULL;
67	debug("verify_response: <%s> = <%d>", response, authok);
68	return authok != 0;
69}
70#else
71#ifdef SKEY
72#include <skey.h>
73
74char *
75get_challenge(Authctxt *authctxt, char *devs)
76{
77	static char challenge[1024];
78	struct skey skey;
79	if (skeychallenge(&skey, authctxt->user, challenge) == -1)
80		return NULL;
81	strlcat(challenge, "\nS/Key Password: ", sizeof challenge);
82	return challenge;
83}
84int
85verify_response(Authctxt *authctxt, char *response)
86{
87	return (authctxt->valid &&
88	    skey_haskey(authctxt->pw->pw_name) == 0 &&
89	    skey_passcheck(authctxt->pw->pw_name, response) != -1);
90}
91#else
92/* not available */
93char *
94get_challenge(Authctxt *authctxt, char *devs)
95{
96	return NULL;
97}
98int
99verify_response(Authctxt *authctxt, char *response)
100{
101	return 0;
102}
103#endif
104#endif
105