blob: c07b2dd814883e80969e780538028d4250845cb1 [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"
Ben Lindstromeec16fc2002-07-04 00:06:15 +000026RCSID("$OpenBSD: auth2-none.c,v 1.4 2002/06/27 10:35:47 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;
49 off_t len, n;
50 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 }
58 len = st.st_size;
59 banner = xmalloc(len + 1);
60 n = atomicio(read, fd, banner, len);
61 close(fd);
62
63 if (n != len) {
Ben Lindstromeec16fc2002-07-04 00:06:15 +000064 xfree(banner);
Ben Lindstrom855bf3a2002-06-06 20:27:55 +000065 return (NULL);
66 }
67 banner[n] = '\0';
Ben Lindstromcb72e4f2002-06-21 00:41:51 +000068
Ben Lindstrom855bf3a2002-06-06 20:27:55 +000069 return (banner);
70}
71
72static void
73userauth_banner(void)
74{
75 char *banner = NULL;
76
77 if (options.banner == NULL || (datafellows & SSH_BUG_BANNER))
78 return;
79
80 if ((banner = PRIVSEP(auth2_read_banner())) == NULL)
81 goto done;
82
83 packet_start(SSH2_MSG_USERAUTH_BANNER);
84 packet_put_cstring(banner);
85 packet_put_cstring(""); /* language, unused */
86 packet_send();
87 debug("userauth_banner: sent");
88done:
89 if (banner)
90 xfree(banner);
Ben Lindstrom855bf3a2002-06-06 20:27:55 +000091}
92
93static int
94userauth_none(Authctxt *authctxt)
95{
96 none_enabled = 0;
97 packet_check_eom();
98 userauth_banner();
99#ifdef HAVE_CYGWIN
100 if (check_nt_auth(1, authctxt->pw) == 0)
101 return(0);
102#endif
103 return (authctxt->valid ? PRIVSEP(auth_password(authctxt, "")) : 0);
104}
105
106Authmethod method_none = {
107 "none",
108 userauth_none,
109 &none_enabled
110};