1 /* $OpenBSD: auth-bsdauth.c,v 1.15 2018/07/09 21:35:50 markus 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 #ifdef BSD_AUTH
33 #include "xmalloc.h"
34 #include "sshkey.h"
35 #include "sshbuf.h"
36 #include "hostfile.h"
37 #include "auth.h"
38 #include "log.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 *infotxt = NULL;
58 *numprompts = 0;
59 *prompts = NULL;
60 *echo_on = NULL;
61
62 if (authctxt->as != NULL) {
63 debug2("bsdauth_query: try reuse session");
64 challenge = auth_getitem(authctxt->as, AUTHV_CHALLENGE);
65 if (challenge == NULL) {
66 auth_close(authctxt->as);
67 authctxt->as = NULL;
68 }
69 }
70
71 if (challenge == NULL) {
72 debug2("bsdauth_query: new bsd auth session");
73 debug3("bsdauth_query: style %s",
74 authctxt->style ? authctxt->style : "<default>");
75 authctxt->as = auth_userchallenge(authctxt->user,
76 authctxt->style, "auth-ssh", &challenge);
77 if (authctxt->as == NULL)
78 challenge = NULL;
79 debug2("bsdauth_query: <%s>", challenge ? challenge : "empty");
80 }
81
82 if (challenge == NULL)
83 return -1;
84
85 *name = xstrdup("");
86 *infotxt = xstrdup("");
87 *numprompts = 1;
88 *prompts = xcalloc(*numprompts, sizeof(char *));
89 *echo_on = xcalloc(*numprompts, sizeof(u_int));
90 (*prompts)[0] = xstrdup(challenge);
91
92 return 0;
93 }
94
95 int
bsdauth_respond(void * ctx,u_int numresponses,char ** responses)96 bsdauth_respond(void *ctx, u_int numresponses, char **responses)
97 {
98 Authctxt *authctxt = ctx;
99 int authok;
100
101 if (!authctxt->valid)
102 return -1;
103
104 if (authctxt->as == NULL)
105 error("bsdauth_respond: no bsd auth session");
106
107 if (numresponses != 1)
108 return -1;
109
110 authok = auth_userresponse(authctxt->as, responses[0], 0);
111 authctxt->as = NULL;
112 debug3("bsdauth_respond: <%s> = <%d>", responses[0], authok);
113
114 return (authok == 0) ? -1 : 0;
115 }
116
117 static void
bsdauth_free_ctx(void * ctx)118 bsdauth_free_ctx(void *ctx)
119 {
120 Authctxt *authctxt = ctx;
121
122 if (authctxt && authctxt->as) {
123 auth_close(authctxt->as);
124 authctxt->as = NULL;
125 }
126 }
127
128 KbdintDevice bsdauth_device = {
129 "bsdauth",
130 bsdauth_init_ctx,
131 bsdauth_query,
132 bsdauth_respond,
133 bsdauth_free_ctx
134 };
135
136 KbdintDevice mm_bsdauth_device = {
137 "bsdauth",
138 bsdauth_init_ctx,
139 mm_bsdauth_query,
140 mm_bsdauth_respond,
141 bsdauth_free_ctx
142 };
143 #endif
144