/* * 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"RCSID("$OpenBSD: auth2-none.c,v 1.4 2002/06/27 10:35:47 deraadt Exp $");#include "auth.h"#include "xmalloc.h"#include "packet.h"#include "log.h"#include "servconf.h"#include "atomicio.h"#include "compat.h"#include "ssh2.h"#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;	off_t len, n;	int fd;	if ((fd = open(options.banner, O_RDONLY)) == -1)		return (NULL);	if (fstat(fd, &st) == -1) {		close(fd);		return (NULL);	}	len = st.st_size;	banner = xmalloc(len + 1);	n = atomicio(read, fd, banner, len);	close(fd);	if (n != len) {		xfree(banner);		return (NULL);	}	banner[n] = '\0';	return (banner);}static voiduserauth_banner(void){	char *banner = NULL;	if (options.banner == NULL || (datafellows & SSH_BUG_BANNER))		return;	if ((banner = PRIVSEP(auth2_read_banner())) == NULL)		goto done;	packet_start(SSH2_MSG_USERAUTH_BANNER);	packet_put_cstring(banner);	packet_put_cstring("");		/* language, unused */	packet_send();	debug("userauth_banner: sent");done:	if (banner)		xfree(banner);}static intuserauth_none(Authctxt *authctxt){	none_enabled = 0;	packet_check_eom();	userauth_banner();	return (authctxt->valid ? PRIVSEP(auth_password(authctxt, "")) : 0);}Authmethod method_none = {	"none",	userauth_none,	&none_enabled};