1/* $OpenBSD: auth-bsdauth.c,v 1.11 2007/09/21 08:15:29 djm Exp $ */
2/*
3 * Copyright (c) 2001 Markus Friedl.  All rights reserved.
4 *
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"
27
28#include <sys/types.h>
29
30#include <stdarg.h>
31
32#ifdef BSD_AUTH
33#include "xmalloc.h"
34#include "key.h"
35#include "hostfile.h"
36#include "auth.h"
37#include "log.h"
38#include "buffer.h"
39#ifdef GSSAPI
40#include "ssh-gss.h"
41#endif
42#include "monitor_wrap.h"
43
44static void *
45bsdauth_init_ctx(Authctxt *authctxt)
46{
47	return authctxt;
48}
49
50int
51bsdauth_query(void *ctx, char **name, char **infotxt,
52   u_int *numprompts, char ***prompts, u_int **echo_on)
53{
54	Authctxt *authctxt = ctx;
55	char *challenge = NULL;
56
57	if (authctxt->as != NULL) {
58		debug2("bsdauth_query: try reuse session");
59		challenge = auth_getitem(authctxt->as, AUTHV_CHALLENGE);
60		if (challenge == NULL) {
61			auth_close(authctxt->as);
62			authctxt->as = NULL;
63		}
64	}
65
66	if (challenge == NULL) {
67		debug2("bsdauth_query: new bsd auth session");
68		debug3("bsdauth_query: style %s",
69		    authctxt->style ? authctxt->style : "<default>");
70		authctxt->as = auth_userchallenge(authctxt->user,
71		    authctxt->style, "auth-ssh", &challenge);
72		if (authctxt->as == NULL)
73			challenge = NULL;
74		debug2("bsdauth_query: <%s>", challenge ? challenge : "empty");
75	}
76
77	if (challenge == NULL)
78		return -1;
79
80	*name = xstrdup("");
81	*infotxt = xstrdup("");
82	*numprompts = 1;
83	*prompts = xcalloc(*numprompts, sizeof(char *));
84	*echo_on = xcalloc(*numprompts, sizeof(u_int));
85	(*prompts)[0] = xstrdup(challenge);
86
87	return 0;
88}
89
90int
91bsdauth_respond(void *ctx, u_int numresponses, char **responses)
92{
93	Authctxt *authctxt = ctx;
94	int authok;
95
96	if (!authctxt->valid)
97		return -1;
98
99	if (authctxt->as == 0)
100		error("bsdauth_respond: no bsd auth session");
101
102	if (numresponses != 1)
103		return -1;
104
105	authok = auth_userresponse(authctxt->as, responses[0], 0);
106	authctxt->as = NULL;
107	debug3("bsdauth_respond: <%s> = <%d>", responses[0], authok);
108
109	return (authok == 0) ? -1 : 0;
110}
111
112static void
113bsdauth_free_ctx(void *ctx)
114{
115	Authctxt *authctxt = ctx;
116
117	if (authctxt && authctxt->as) {
118		auth_close(authctxt->as);
119		authctxt->as = NULL;
120	}
121}
122
123KbdintDevice bsdauth_device = {
124	"bsdauth",
125	bsdauth_init_ctx,
126	bsdauth_query,
127	bsdauth_respond,
128	bsdauth_free_ctx
129};
130
131KbdintDevice mm_bsdauth_device = {
132	"bsdauth",
133	bsdauth_init_ctx,
134	mm_bsdauth_query,
135	mm_bsdauth_respond,
136	bsdauth_free_ctx
137};
138#endif
139