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1 /* $OpenBSD: auth-skey.c,v 1.27 2007/01/21 01:41:54 stevesk 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 #ifdef SKEY
29 
30 #include <sys/types.h>
31 
32 #include <pwd.h>
33 #include <stdio.h>
34 
35 #include <skey.h>
36 
37 #include "xmalloc.h"
38 #include "key.h"
39 #include "hostfile.h"
40 #include "auth.h"
41 #include "ssh-gss.h"
42 #include "log.h"
43 #include "monitor_wrap.h"
44 
45 static void *
skey_init_ctx(Authctxt * authctxt)46 skey_init_ctx(Authctxt *authctxt)
47 {
48 	return authctxt;
49 }
50 
51 int
skey_query(void * ctx,char ** name,char ** infotxt,u_int * numprompts,char *** prompts,u_int ** echo_on)52 skey_query(void *ctx, char **name, char **infotxt,
53     u_int* numprompts, char ***prompts, u_int **echo_on)
54 {
55 	Authctxt *authctxt = ctx;
56 	char challenge[1024];
57 	struct skey skey;
58 
59 	if (_compat_skeychallenge(&skey, authctxt->user, challenge,
60 	    sizeof(challenge)) == -1)
61 		return -1;
62 
63 	*name = xstrdup("");
64 	*infotxt = xstrdup("");
65 	*numprompts = 1;
66 	*prompts = xcalloc(*numprompts, sizeof(char *));
67 	*echo_on = xcalloc(*numprompts, sizeof(u_int));
68 
69 	xasprintf(*prompts, "%s%s", challenge, SKEY_PROMPT);
70 
71 	return 0;
72 }
73 
74 int
skey_respond(void * ctx,u_int numresponses,char ** responses)75 skey_respond(void *ctx, u_int numresponses, char **responses)
76 {
77 	Authctxt *authctxt = ctx;
78 
79 	if (authctxt->valid &&
80 	    numresponses == 1 &&
81 	    skey_haskey(authctxt->pw->pw_name) == 0 &&
82 	    skey_passcheck(authctxt->pw->pw_name, responses[0]) != -1)
83 	    return 0;
84 	return -1;
85 }
86 
87 static void
skey_free_ctx(void * ctx)88 skey_free_ctx(void *ctx)
89 {
90 	/* we don't have a special context */
91 }
92 
93 KbdintDevice skey_device = {
94 	"skey",
95 	skey_init_ctx,
96 	skey_query,
97 	skey_respond,
98 	skey_free_ctx
99 };
100 
101 KbdintDevice mm_skey_device = {
102 	"skey",
103 	skey_init_ctx,
104 	mm_skey_query,
105 	mm_skey_respond,
106 	skey_free_ctx
107 };
108 #endif /* SKEY */
109