mirror of
git://anongit.mindrot.org/openssh.git
synced 2024-12-26 20:02:13 +00:00
4890e53977
[auth2-none.c sshd_config sshd_config.5]
Support "Banner=none" to disable displaying of the pre-login banner;
ok dtucker@ deraadt@
144 lines
3.3 KiB
C
144 lines
3.3 KiB
C
/* $OpenBSD: auth2-none.c,v 1.14 2007/08/23 03:22:16 djm Exp $ */
|
|
/*
|
|
* Copyright (c) 2000 Markus Friedl. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include "includes.h"
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/uio.h>
|
|
|
|
#include <fcntl.h>
|
|
#include <stdarg.h>
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
|
|
#include "xmalloc.h"
|
|
#include "key.h"
|
|
#include "hostfile.h"
|
|
#include "auth.h"
|
|
#include "packet.h"
|
|
#include "log.h"
|
|
#include "buffer.h"
|
|
#include "servconf.h"
|
|
#include "atomicio.h"
|
|
#include "compat.h"
|
|
#include "ssh2.h"
|
|
#ifdef GSSAPI
|
|
#include "ssh-gss.h"
|
|
#endif
|
|
#include "monitor_wrap.h"
|
|
|
|
/* import */
|
|
extern ServerOptions options;
|
|
|
|
/* "none" is allowed only one time */
|
|
static int none_enabled = 1;
|
|
|
|
char *
|
|
auth2_read_banner(void)
|
|
{
|
|
struct stat st;
|
|
char *banner = NULL;
|
|
size_t len, n;
|
|
int fd;
|
|
|
|
if ((fd = open(options.banner, O_RDONLY)) == -1)
|
|
return (NULL);
|
|
if (fstat(fd, &st) == -1) {
|
|
close(fd);
|
|
return (NULL);
|
|
}
|
|
if (st.st_size > 1*1024*1024) {
|
|
close(fd);
|
|
return (NULL);
|
|
}
|
|
|
|
len = (size_t)st.st_size; /* truncate */
|
|
banner = xmalloc(len + 1);
|
|
n = atomicio(read, fd, banner, len);
|
|
close(fd);
|
|
|
|
if (n != len) {
|
|
xfree(banner);
|
|
return (NULL);
|
|
}
|
|
banner[n] = '\0';
|
|
|
|
return (banner);
|
|
}
|
|
|
|
void
|
|
userauth_send_banner(const char *msg)
|
|
{
|
|
if (datafellows & SSH_BUG_BANNER)
|
|
return;
|
|
|
|
packet_start(SSH2_MSG_USERAUTH_BANNER);
|
|
packet_put_cstring(msg);
|
|
packet_put_cstring(""); /* language, unused */
|
|
packet_send();
|
|
debug("%s: sent", __func__);
|
|
}
|
|
|
|
static void
|
|
userauth_banner(void)
|
|
{
|
|
char *banner = NULL;
|
|
|
|
if (options.banner == NULL ||
|
|
strcasecmp(options.banner, "none") == 0 ||
|
|
(datafellows & SSH_BUG_BANNER) != 0)
|
|
return;
|
|
|
|
if ((banner = PRIVSEP(auth2_read_banner())) == NULL)
|
|
goto done;
|
|
userauth_send_banner(banner);
|
|
|
|
done:
|
|
if (banner)
|
|
xfree(banner);
|
|
}
|
|
|
|
static int
|
|
userauth_none(Authctxt *authctxt)
|
|
{
|
|
none_enabled = 0;
|
|
packet_check_eom();
|
|
userauth_banner();
|
|
#ifdef HAVE_CYGWIN
|
|
if (check_nt_auth(1, authctxt->pw) == 0)
|
|
return (0);
|
|
#endif
|
|
if (options.password_authentication)
|
|
return (PRIVSEP(auth_password(authctxt, "")));
|
|
return (0);
|
|
}
|
|
|
|
Authmethod method_none = {
|
|
"none",
|
|
userauth_none,
|
|
&none_enabled
|
|
};
|