auth-bsdauth.c revision 296853 
1/* $OpenBSD: auth-bsdauth.c,v 1.14 2015/10/20 23:24:25 mmcc 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#include <stdarg.h>
30#include <stdio.h>
31
32#include <stdarg.h>
33
34#ifdef BSD_AUTH
35#include "xmalloc.h"
36#include "key.h"
37#include "hostfile.h"
38#include "auth.h"
39#include "log.h"
40#include "buffer.h"
41#ifdef GSSAPI
42#include "ssh-gss.h"
43#endif
44#include "monitor_wrap.h"
45
46static void *
47bsdauth_init_ctx(Authctxt *authctxt)
48{
49	return authctxt;
50}
51
52int
53bsdauth_query(void *ctx, char **name, char **infotxt,
54   u_int *numprompts, char ***prompts, u_int **echo_on)
55{
56	Authctxt *authctxt = ctx;
57	char *challenge = NULL;
58
59	*infotxt = NULL;
60	*numprompts = 0;
61	*prompts = NULL;
62	*echo_on = NULL;
63
64	if (authctxt->as != NULL) {
65		debug2("bsdauth_query: try reuse session");
66		challenge = auth_getitem(authctxt->as, AUTHV_CHALLENGE);
67		if (challenge == NULL) {
68			auth_close(authctxt->as);
69			authctxt->as = NULL;
70		}
71	}
72
73	if (challenge == NULL) {
74		debug2("bsdauth_query: new bsd auth session");
75		debug3("bsdauth_query: style %s",
76		    authctxt->style ? authctxt->style : "<default>");
77		authctxt->as = auth_userchallenge(authctxt->user,
78		    authctxt->style, "auth-ssh", &challenge);
79		if (authctxt->as == NULL)
80			challenge = NULL;
81		debug2("bsdauth_query: <%s>", challenge ? challenge : "empty");
82	}
83
84	if (challenge == NULL)
85		return -1;
86
87	*name = xstrdup("");
88	*infotxt = xstrdup("");
89	*numprompts = 1;
90	*prompts = xcalloc(*numprompts, sizeof(char *));
91	*echo_on = xcalloc(*numprompts, sizeof(u_int));
92	(*prompts)[0] = xstrdup(challenge);
93
94	return 0;
95}
96
97int
98bsdauth_respond(void *ctx, u_int numresponses, char **responses)
99{
100	Authctxt *authctxt = ctx;
101	int authok;
102
103	if (!authctxt->valid)
104		return -1;
105
106	if (authctxt->as == NULL)
107		error("bsdauth_respond: no bsd auth session");
108
109	if (numresponses != 1)
110		return -1;
111
112	authok = auth_userresponse(authctxt->as, responses[0], 0);
113	authctxt->as = NULL;
114	debug3("bsdauth_respond: <%s> = <%d>", responses[0], authok);
115
116	return (authok == 0) ? -1 : 0;
117}
118
119static void
120bsdauth_free_ctx(void *ctx)
121{
122	Authctxt *authctxt = ctx;
123
124	if (authctxt && authctxt->as) {
125		auth_close(authctxt->as);
126		authctxt->as = NULL;
127	}
128}
129
130KbdintDevice bsdauth_device = {
131	"bsdauth",
132	bsdauth_init_ctx,
133	bsdauth_query,
134	bsdauth_respond,
135	bsdauth_free_ctx
136};
137
138KbdintDevice mm_bsdauth_device = {
139	"bsdauth",
140	bsdauth_init_ctx,
141	mm_bsdauth_query,
142	mm_bsdauth_respond,
143	bsdauth_free_ctx
144};
145#endif
146