Annotation of src/usr.bin/ssh/auth2-none.c, Revision 1.7.6.1
1.7.6.1 ! brad 1: /* $OpenBSD: auth2-none.c,v 1.13 2006/08/05 07:52:52 dtucker 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:
1.7.6.1 ! brad 26: #include <sys/types.h>
! 27: #include <sys/stat.h>
! 28: #include <sys/uio.h>
! 29:
! 30: #include <fcntl.h>
! 31: #include <unistd.h>
1.1 markus 32:
33: #include "xmalloc.h"
1.7.6.1 ! brad 34: #include "key.h"
! 35: #include "hostfile.h"
! 36: #include "auth.h"
1.1 markus 37: #include "packet.h"
38: #include "log.h"
1.7.6.1 ! brad 39: #include "buffer.h"
1.1 markus 40: #include "servconf.h"
41: #include "atomicio.h"
42: #include "compat.h"
43: #include "ssh2.h"
1.7.6.1 ! brad 44: #ifdef GSSAPI
! 45: #include "ssh-gss.h"
! 46: #endif
1.1 markus 47: #include "monitor_wrap.h"
48:
49: /* import */
50: extern ServerOptions options;
51:
1.2 markus 52: /* "none" is allowed only one time */
53: static int none_enabled = 1;
54:
1.1 markus 55: char *
56: auth2_read_banner(void)
57: {
58: struct stat st;
59: char *banner = NULL;
1.7 deraadt 60: size_t len, n;
1.1 markus 61: int fd;
62:
63: if ((fd = open(options.banner, O_RDONLY)) == -1)
64: return (NULL);
65: if (fstat(fd, &st) == -1) {
66: close(fd);
67: return (NULL);
68: }
1.7 deraadt 69: if (st.st_size > 1*1024*1024) {
70: close(fd);
71: return (NULL);
72: }
73:
74: len = (size_t)st.st_size; /* truncate */
1.1 markus 75: banner = xmalloc(len + 1);
76: n = atomicio(read, fd, banner, len);
77: close(fd);
78:
79: if (n != len) {
1.4 deraadt 80: xfree(banner);
1.1 markus 81: return (NULL);
82: }
83: banner[n] = '\0';
1.3 deraadt 84:
1.1 markus 85: return (banner);
86: }
87:
88: static void
89: userauth_banner(void)
90: {
91: char *banner = NULL;
92:
93: if (options.banner == NULL || (datafellows & SSH_BUG_BANNER))
94: return;
95:
96: if ((banner = PRIVSEP(auth2_read_banner())) == NULL)
97: goto done;
98:
99: packet_start(SSH2_MSG_USERAUTH_BANNER);
100: packet_put_cstring(banner);
101: packet_put_cstring(""); /* language, unused */
102: packet_send();
103: debug("userauth_banner: sent");
104: done:
105: if (banner)
106: xfree(banner);
107: }
108:
1.2 markus 109: static int
1.1 markus 110: userauth_none(Authctxt *authctxt)
111: {
1.2 markus 112: none_enabled = 0;
1.1 markus 113: packet_check_eom();
114: userauth_banner();
1.6 markus 115: if (options.password_authentication)
1.5 markus 116: return (PRIVSEP(auth_password(authctxt, "")));
117: return (0);
1.1 markus 118: }
1.2 markus 119:
120: Authmethod method_none = {
121: "none",
122: userauth_none,
123: &none_enabled
124: };