Annotation of src/usr.bin/ssh/auth2-none.c, Revision 1.8
1.1 markus 1: /*
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"
1.8 ! stevesk 26: RCSID("$OpenBSD: auth2-none.c,v 1.7 2004/05/11 19:01:43 deraadt Exp $");
! 27:
! 28: #include <sys/types.h>
! 29: #include <sys/stat.h>
1.1 markus 30:
31: #include "auth.h"
32: #include "xmalloc.h"
33: #include "packet.h"
34: #include "log.h"
35: #include "servconf.h"
36: #include "atomicio.h"
37: #include "compat.h"
38: #include "ssh2.h"
39: #include "monitor_wrap.h"
40:
41: /* import */
42: extern ServerOptions options;
43:
1.2 markus 44: /* "none" is allowed only one time */
45: static int none_enabled = 1;
46:
1.1 markus 47: char *
48: auth2_read_banner(void)
49: {
50: struct stat st;
51: char *banner = NULL;
1.7 deraadt 52: size_t len, n;
1.1 markus 53: int fd;
54:
55: if ((fd = open(options.banner, O_RDONLY)) == -1)
56: return (NULL);
57: if (fstat(fd, &st) == -1) {
58: close(fd);
59: return (NULL);
60: }
1.7 deraadt 61: if (st.st_size > 1*1024*1024) {
62: close(fd);
63: return (NULL);
64: }
65:
66: len = (size_t)st.st_size; /* truncate */
1.1 markus 67: banner = xmalloc(len + 1);
68: n = atomicio(read, fd, banner, len);
69: close(fd);
70:
71: if (n != len) {
1.4 deraadt 72: xfree(banner);
1.1 markus 73: return (NULL);
74: }
75: banner[n] = '\0';
1.3 deraadt 76:
1.1 markus 77: return (banner);
78: }
79:
80: static void
81: userauth_banner(void)
82: {
83: char *banner = NULL;
84:
85: if (options.banner == NULL || (datafellows & SSH_BUG_BANNER))
86: return;
87:
88: if ((banner = PRIVSEP(auth2_read_banner())) == NULL)
89: goto done;
90:
91: packet_start(SSH2_MSG_USERAUTH_BANNER);
92: packet_put_cstring(banner);
93: packet_put_cstring(""); /* language, unused */
94: packet_send();
95: debug("userauth_banner: sent");
96: done:
97: if (banner)
98: xfree(banner);
99: }
100:
1.2 markus 101: static int
1.1 markus 102: userauth_none(Authctxt *authctxt)
103: {
1.2 markus 104: none_enabled = 0;
1.1 markus 105: packet_check_eom();
106: userauth_banner();
1.6 markus 107: if (options.password_authentication)
1.5 markus 108: return (PRIVSEP(auth_password(authctxt, "")));
109: return (0);
1.1 markus 110: }
1.2 markus 111:
112: Authmethod method_none = {
113: "none",
114: userauth_none,
115: &none_enabled
116: };