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 <sys/types.h>
27 #include <stdarg.h>
28 #include <stdio.h>
29
30 #include "xmalloc.h"
31 #include "sshkey.h"
32 #include "sshbuf.h"
33 #include "hostfile.h"
34 #include "auth.h"
35 #include "log.h"
36 #ifdef GSSAPI
37 #include "ssh-gss.h"
38 #endif
39 #include "monitor_wrap.h"
40
41 static void *
bsdauth_init_ctx(Authctxt * authctxt)42 bsdauth_init_ctx(Authctxt *authctxt)
43 {
44 return authctxt;
45 }
46
47 int
bsdauth_query(void * ctx,char ** name,char ** infotxt,u_int * numprompts,char *** prompts,u_int ** echo_on)48 bsdauth_query(void *ctx, char **name, char **infotxt,
49 u_int *numprompts, char ***prompts, u_int **echo_on)
50 {
51 Authctxt *authctxt = ctx;
52 char *challenge = NULL;
53
54 *infotxt = NULL;
55 *numprompts = 0;
56 *prompts = NULL;
57 *echo_on = NULL;
58
59 if (authctxt->as != NULL) {
60 debug2("bsdauth_query: try reuse session");
61 challenge = auth_getitem(authctxt->as, AUTHV_CHALLENGE);
62 if (challenge == NULL) {
63 auth_close(authctxt->as);
64 authctxt->as = NULL;
65 }
66 }
67
68 if (challenge == NULL) {
69 debug2("bsdauth_query: new bsd auth session");
70 debug3("bsdauth_query: style %s",
71 authctxt->style ? authctxt->style : "<default>");
72 authctxt->as = auth_userchallenge(authctxt->user,
73 authctxt->style, "auth-ssh", &challenge);
74 if (authctxt->as == NULL)
75 challenge = NULL;
76 debug2("bsdauth_query: <%s>", challenge ? challenge : "empty");
77 }
78
79 if (challenge == NULL)
80 return -1;
81
82 *name = xstrdup("");
83 *infotxt = xstrdup("");
84 *numprompts = 1;
85 *prompts = xcalloc(*numprompts, sizeof(char *));
86 *echo_on = xcalloc(*numprompts, sizeof(u_int));
87 (*prompts)[0] = xstrdup(challenge);
88
89 return 0;
90 }
91
92 int
bsdauth_respond(void * ctx,u_int numresponses,char ** responses)93 bsdauth_respond(void *ctx, u_int numresponses, char **responses)
94 {
95 Authctxt *authctxt = ctx;
96 int authok;
97
98 if (!authctxt->valid)
99 return -1;
100
101 if (authctxt->as == NULL)
102 error("bsdauth_respond: no bsd auth session");
103
104 if (numresponses != 1)
105 return -1;
106
107 authok = auth_userresponse(authctxt->as, responses[0], 0);
108 authctxt->as = NULL;
109 debug3("bsdauth_respond: <%s> = <%d>", responses[0], authok);
110
111 return (authok == 0) ? -1 : 0;
112 }
113
114 static void
bsdauth_free_ctx(void * ctx)115 bsdauth_free_ctx(void *ctx)
116 {
117 Authctxt *authctxt = ctx;
118
119 if (authctxt && authctxt->as) {
120 auth_close(authctxt->as);
121 authctxt->as = NULL;
122 }
123 }
124
125 KbdintDevice bsdauth_device = {
126 "bsdauth",
127 bsdauth_init_ctx,
128 bsdauth_query,
129 bsdauth_respond,
130 bsdauth_free_ctx
131 };
132
133 KbdintDevice mm_bsdauth_device = {
134 "bsdauth",
135 bsdauth_init_ctx,
136 mm_bsdauth_query,
137 mm_bsdauth_respond,
138 bsdauth_free_ctx
139 };
140