blob: 1c30a3203e1f94c528a88590d7141d677a40eeb6 [file] [log] [blame]
Ben Lindstrom855bf3a2002-06-06 20:27:55 +00001/*
2 * Copyright (c) 2000 Markus Friedl. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
14 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
15 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
16 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
17 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
18 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
19 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
20 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
21 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
22 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23 */
24
25#include "includes.h"
Darren Tucker1f8311c2004-05-13 16:39:33 +100026RCSID("$OpenBSD: auth2-none.c,v 1.7 2004/05/11 19:01:43 deraadt Exp $");
Ben Lindstrom855bf3a2002-06-06 20:27:55 +000027
28#include "auth.h"
29#include "xmalloc.h"
30#include "packet.h"
31#include "log.h"
32#include "servconf.h"
33#include "atomicio.h"
34#include "compat.h"
35#include "ssh2.h"
36#include "monitor_wrap.h"
37
38/* import */
39extern ServerOptions options;
40
41/* "none" is allowed only one time */
42static int none_enabled = 1;
43
44char *
45auth2_read_banner(void)
46{
47 struct stat st;
48 char *banner = NULL;
Darren Tucker1f8311c2004-05-13 16:39:33 +100049 size_t len, n;
Ben Lindstrom855bf3a2002-06-06 20:27:55 +000050 int fd;
51
52 if ((fd = open(options.banner, O_RDONLY)) == -1)
53 return (NULL);
54 if (fstat(fd, &st) == -1) {
55 close(fd);
56 return (NULL);
57 }
Darren Tucker1f8311c2004-05-13 16:39:33 +100058 if (st.st_size > 1*1024*1024) {
59 close(fd);
60 return (NULL);
61 }
62
63 len = (size_t)st.st_size; /* truncate */
Ben Lindstrom855bf3a2002-06-06 20:27:55 +000064 banner = xmalloc(len + 1);
65 n = atomicio(read, fd, banner, len);
66 close(fd);
67
68 if (n != len) {
Ben Lindstromeec16fc2002-07-04 00:06:15 +000069 xfree(banner);
Ben Lindstrom855bf3a2002-06-06 20:27:55 +000070 return (NULL);
71 }
72 banner[n] = '\0';
Ben Lindstromcb72e4f2002-06-21 00:41:51 +000073
Ben Lindstrom855bf3a2002-06-06 20:27:55 +000074 return (banner);
75}
76
Darren Tucker77fc29e2004-09-11 23:07:03 +100077void
78userauth_send_banner(const char *msg)
79{
80 if (datafellows & SSH_BUG_BANNER)
81 return;
82
83 packet_start(SSH2_MSG_USERAUTH_BANNER);
84 packet_put_cstring(msg);
85 packet_put_cstring(""); /* language, unused */
86 packet_send();
87 debug("%s: sent", __func__);
88}
89
Ben Lindstrom855bf3a2002-06-06 20:27:55 +000090static void
91userauth_banner(void)
92{
93 char *banner = NULL;
94
95 if (options.banner == NULL || (datafellows & SSH_BUG_BANNER))
96 return;
97
98 if ((banner = PRIVSEP(auth2_read_banner())) == NULL)
99 goto done;
Darren Tucker77fc29e2004-09-11 23:07:03 +1000100 userauth_send_banner(banner);
Ben Lindstrom855bf3a2002-06-06 20:27:55 +0000101
Ben Lindstrom855bf3a2002-06-06 20:27:55 +0000102done:
103 if (banner)
104 xfree(banner);
Ben Lindstrom855bf3a2002-06-06 20:27:55 +0000105}
106
107static int
108userauth_none(Authctxt *authctxt)
109{
110 none_enabled = 0;
111 packet_check_eom();
112 userauth_banner();
113#ifdef HAVE_CYGWIN
114 if (check_nt_auth(1, authctxt->pw) == 0)
Damien Miller47656792004-09-11 22:42:09 +1000115 return (0);
Ben Lindstrom855bf3a2002-06-06 20:27:55 +0000116#endif
Damien Miller856f0be2003-09-03 07:32:45 +1000117 if (options.password_authentication)
Darren Tucker4b609662003-08-03 00:05:01 +1000118 return (PRIVSEP(auth_password(authctxt, "")));
119 return (0);
Ben Lindstrom855bf3a2002-06-06 20:27:55 +0000120}
121
122Authmethod method_none = {
123 "none",
124 userauth_none,
125 &none_enabled
126};