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
46 static void *
bsdauth_init_ctx(Authctxt * authctxt)47 bsdauth_init_ctx(Authctxt *authctxt)
48 {
49 return authctxt;
50 }
51
52 int
bsdauth_query(void * ctx,char ** name,char ** infotxt,u_int * numprompts,char *** prompts,u_int ** echo_on)53 bsdauth_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
97 int
bsdauth_respond(void * ctx,u_int numresponses,char ** responses)98 bsdauth_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
119 static void
bsdauth_free_ctx(void * ctx)120 bsdauth_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
130 KbdintDevice bsdauth_device = {
131 "bsdauth",
132 bsdauth_init_ctx,
133 bsdauth_query,
134 bsdauth_respond,
135 bsdauth_free_ctx
136 };
137
138 KbdintDevice 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