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
44 static void *
bsdauth_init_ctx(Authctxt * authctxt)45 bsdauth_init_ctx(Authctxt *authctxt)
46 {
47 return authctxt;
48 }
49
50 int
bsdauth_query(void * ctx,char ** name,char ** infotxt,u_int * numprompts,char *** prompts,u_int ** echo_on)51 bsdauth_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
90 int
bsdauth_respond(void * ctx,u_int numresponses,char ** responses)91 bsdauth_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
112 static void
bsdauth_free_ctx(void * ctx)113 bsdauth_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
123 KbdintDevice bsdauth_device = {
124 "bsdauth",
125 bsdauth_init_ctx,
126 bsdauth_query,
127 bsdauth_respond,
128 bsdauth_free_ctx
129 };
130
131 KbdintDevice 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