Annotation of src/usr.bin/ssh/auth2-none.c, Revision 1.11
1.11 ! stevesk 1: /* $OpenBSD: auth2-none.c,v 1.10 2006/03/25 13:17:01 djm Exp $ */
1.1 markus 2: /*
3: * Copyright (c) 2000 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"
1.8 stevesk 27:
28: #include <sys/types.h>
29: #include <sys/stat.h>
1.11 ! stevesk 30:
! 31: #include <fcntl.h>
1.1 markus 32:
33: #include "auth.h"
34: #include "xmalloc.h"
35: #include "packet.h"
36: #include "log.h"
37: #include "servconf.h"
38: #include "atomicio.h"
39: #include "compat.h"
40: #include "ssh2.h"
41: #include "monitor_wrap.h"
42:
43: /* import */
44: extern ServerOptions options;
45:
1.2 markus 46: /* "none" is allowed only one time */
47: static int none_enabled = 1;
48:
1.1 markus 49: char *
50: auth2_read_banner(void)
51: {
52: struct stat st;
53: char *banner = NULL;
1.7 deraadt 54: size_t len, n;
1.1 markus 55: int fd;
56:
57: if ((fd = open(options.banner, O_RDONLY)) == -1)
58: return (NULL);
59: if (fstat(fd, &st) == -1) {
60: close(fd);
61: return (NULL);
62: }
1.7 deraadt 63: if (st.st_size > 1*1024*1024) {
64: close(fd);
65: return (NULL);
66: }
67:
68: len = (size_t)st.st_size; /* truncate */
1.1 markus 69: banner = xmalloc(len + 1);
70: n = atomicio(read, fd, banner, len);
71: close(fd);
72:
73: if (n != len) {
1.4 deraadt 74: xfree(banner);
1.1 markus 75: return (NULL);
76: }
77: banner[n] = '\0';
1.3 deraadt 78:
1.1 markus 79: return (banner);
80: }
81:
82: static void
83: userauth_banner(void)
84: {
85: char *banner = NULL;
86:
87: if (options.banner == NULL || (datafellows & SSH_BUG_BANNER))
88: return;
89:
90: if ((banner = PRIVSEP(auth2_read_banner())) == NULL)
91: goto done;
92:
93: packet_start(SSH2_MSG_USERAUTH_BANNER);
94: packet_put_cstring(banner);
95: packet_put_cstring(""); /* language, unused */
96: packet_send();
97: debug("userauth_banner: sent");
98: done:
99: if (banner)
100: xfree(banner);
101: }
102:
1.2 markus 103: static int
1.1 markus 104: userauth_none(Authctxt *authctxt)
105: {
1.2 markus 106: none_enabled = 0;
1.1 markus 107: packet_check_eom();
108: userauth_banner();
1.6 markus 109: if (options.password_authentication)
1.5 markus 110: return (PRIVSEP(auth_password(authctxt, "")));
111: return (0);
1.1 markus 112: }
1.2 markus 113:
114: Authmethod method_none = {
115: "none",
116: userauth_none,
117: &none_enabled
118: };