<?php
/* $Id$ */
/*
 snort_preprocessors.php
 part of m0n0wall (http://m0n0.ch/wall)

 Copyright (C) 2003-2004 Manuel Kasper <mk@neon1.net>.
 Copyright (C) 2008-2009 Robert Zelaya.
 Copyright (C) 2011 Ermal Luci
 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 ``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.
 */


require_once("guiconfig.inc");
require_once("/usr/local/pkg/snort/snort_gui.inc");
require_once("/usr/local/pkg/snort/snort.inc");

global $g;

if (!is_array($config['installedpackages']['snortglobal']['rule'])) {
	$config['installedpackages']['snortglobal']['rule'] = array();
}
$a_nat = &$config['installedpackages']['snortglobal']['rule'];

$id = $_GET['id'];
if (isset($_POST['id']))
	$id = $_POST['id'];
if (is_null($id)) {
        header("Location: /snort/snort_interfaces.php");
        exit;
}

$pconfig = array();
if (isset($id) && $a_nat[$id]) {
	$pconfig = $a_nat[$id];

	/* new options */
	$pconfig['perform_stat'] = $a_nat[$id]['perform_stat'];
	$pconfig['def_ssl_ports_ignore'] = $a_nat[$id]['def_ssl_ports_ignore'];
	$pconfig['flow_depth'] = $a_nat[$id]['flow_depth'];
	$pconfig['max_queued_bytes'] = $a_nat[$id]['max_queued_bytes'];
	$pconfig['max_queued_segs'] = $a_nat[$id]['max_queued_segs'];
	$pconfig['perform_stat'] = $a_nat[$id]['perform_stat'];
	$pconfig['http_inspect'] = $a_nat[$id]['http_inspect'];
	$pconfig['other_preprocs'] = $a_nat[$id]['other_preprocs'];
	$pconfig['ftp_preprocessor'] = $a_nat[$id]['ftp_preprocessor'];
	$pconfig['smtp_preprocessor'] = $a_nat[$id]['smtp_preprocessor'];
	$pconfig['sf_portscan'] = $a_nat[$id]['sf_portscan'];
	$pconfig['dce_rpc_2'] = $a_nat[$id]['dce_rpc_2'];
	$pconfig['dns_preprocessor'] = $a_nat[$id]['dns_preprocessor'];
}

/* convert fake interfaces to real */
$if_real = snort_get_real_interface($pconfig['interface']);
$snort_uuid = $pconfig['uuid'];

/* alert file */
$d_snortconfdirty_path = "/var/run/snort_conf_{$snort_uuid}_{$if_real}.dirty";

if ($_POST) {

	$natent = array();
	$natent = $pconfig;

	/* if no errors write to conf */
	if (!$input_errors) {
		/* post new options */
		$natent['perform_stat'] = $_POST['perform_stat'];
		if ($_POST['def_ssl_ports_ignore'] != "") { $natent['def_ssl_ports_ignore'] = $_POST['def_ssl_ports_ignore']; }else{ $natent['def_ssl_ports_ignore'] = ""; }
		if ($_POST['flow_depth'] != "") { $natent['flow_depth'] = $_POST['flow_depth']; }else{ $natent['flow_depth'] = ""; }
		if ($_POST['max_queued_bytes'] != "") { $natent['max_queued_bytes'] = $_POST['max_queued_bytes']; }else{ $natent['max_queued_bytes'] = ""; }
		if ($_POST['max_queued_segs'] != "") { $natent['max_queued_segs'] = $_POST['max_queued_segs']; }else{ $natent['max_queued_segs'] = ""; }

		$natent['perform_stat'] = $_POST['perform_stat'] ? 'on' : 'off';
		$natent['http_inspect'] = $_POST['http_inspect'] ? 'on' : 'off';
		$natent['other_preprocs'] = $_POST['other_preprocs'] ? 'on' : 'off';
		$natent['ftp_preprocessor'] = $_POST['ftp_preprocessor'] ? 'on' : 'off';
		$natent['smtp_preprocessor'] = $_POST['smtp_preprocessor'] ? 'on' : 'off';
		$natent['sf_portscan'] = $_POST['sf_portscan'] ? 'on' : 'off';
		$natent['dce_rpc_2'] = $_POST['dce_rpc_2'] ? 'on' : 'off';
		$natent['dns_preprocessor'] = $_POST['dns_preprocessor'] ? 'on' : 'off';

		if (isset($id) && $a_nat[$id])
			$a_nat[$id] = $natent;
		else {
			if (is_numeric($after))
				array_splice($a_nat, $after+1, 0, array($natent));
			else
				$a_nat[] = $natent;
		}

		write_config();

		$if_real = snort_get_real_interface($pconfig['interface']);
		sync_snort_package_config();

		/* after click go to this page */
		header( 'Expires: Sat, 26 Jul 1997 05:00:00 GMT' );
		header( 'Last-Modified: ' . gmdate( 'D, d M Y H:i:s' ) . ' GMT' );
		header( 'Cache-Control: no-store, no-cache, must-revalidate' );
		header( 'Cache-Control: post-check=0, pre-check=0', false );
		header( 'Pragma: no-cache' );
		header("Location: snort_preprocessors.php?id=$id");
		exit;
	}
}

$pgtitle = "Snort: Interface $id$if_real Preprocessors and Flow";
include_once("head.inc");

?>
<body
	link="#0000CC" vlink="#0000CC" alink="#0000CC">

<?php include("fbegin.inc"); ?>
<?if($pfsense_stable == 'yes'){echo '<p class="pgtitle">' . $pgtitle . '</p>';}?>

<?php
echo "{$snort_general_css}\n";
?>

<div class="body2">

<noscript>
<div class="alert" ALIGN=CENTER><img
	src="../themes/<?php echo $g['theme']; ?>/images/icons/icon_alert.gif" /><strong>Please
enable JavaScript to view this content
</CENTER></div>
</noscript>


<form action="snort_preprocessors.php" method="post"
	enctype="multipart/form-data" name="iform" id="iform"><?php

	/* Display Alert message */

	if ($input_errors) {
		print_input_errors($input_errors); // TODO: add checks
	}

	if ($savemsg) {
		print_info_box2($savemsg);
	}

	?>

<table width="100%" border="0" cellpadding="0" cellspacing="0">
<tr><td>
<?php
        $tab_array = array();
        $tabid = 0;
        $tab_array[$tabid] = array(gettext("Snort Interfaces"), false, "/snort/snort_interfaces.php");
        $tabid++;
        $tab_array[$tabid] = array(gettext("If Settings"), false, "/snort/snort_interfaces_edit.php?id={$id}");
        $tabid++;
        $tab_array[$tabid] = array(gettext("Categories"), false, "/snort/snort_rulesets.php?id={$id}");
        $tabid++;
        $tab_array[$tabid] = array(gettext("Rules"), false, "/snort/snort_rules.php?id={$id}");
        $tabid++;
        $tab_array[$tabid] = array(gettext("Servers"), false, "/snort/snort_define_servers.php?id={$id}");
        $tabid++;
        $tab_array[$tabid] = array(gettext("Preprocessors"), true, "/snort/snort_preprocessors.php?id={$id}");
        $tabid++;
        $tab_array[$tabid] = array(gettext("Barnyard2"), false, "/snort/snort_barnyard.php?id={$id}");
        display_top_tabs($tab_array);
?>
</td></tr>
	<tr>
		<td class="tabcont">
		<table width="100%" border="0" cellpadding="6" cellspacing="0">
		<?php
		/* display error code if there is no id */
		if($id == "")
		{
			echo "
				<style type=\"text/css\">
				.noid {
				position:absolute;
				top:10px;
				left:0px;
				width:94%;
				background:#FCE9C0;
				background-position: 15px; 
				border-top:2px solid #DBAC48;
				border-bottom:2px solid #DBAC48;
				padding: 15px 10px 85% 50px;
				}
				</style> 
				<div class=\"alert\" ALIGN=CENTER><img src=\"../themes/{$g['theme']}/images/icons/icon_alert.gif\"/><strong>You can not edit options without an interface ID.</CENTER></div>\n";

		}
		?>
			<tr>
				<td width="22%" valign="top">&nbsp;</td>
				<td width="78%"><span class="vexpl"><span class="red"><strong>Note:
				</strong></span><br>
				Rules may be dependent on preprocessors!<br>
				Defaults will be used when there is no user input.<br></td>
			</tr>
			<tr>
				<td colspan="2" valign="top" class="listtopic">Performance
				Statistics</td>
			</tr>
			<tr>
				<td width="22%" valign="top" class="vncell2">Enable</td>
				<td width="78%" class="vtable"><input name="perform_stat"
					type="checkbox" value="on"
					<?php if ($pconfig['perform_stat']=="on") echo "checked"; ?>
					onClick="enable_change(false)"> Performance Statistics for this
				interface.</td>
			</tr>
			<tr>
				<td colspan="2" valign="top" class="listtopic">HTTP Inspect Settings</td>
			</tr>
			<tr>
				<td width="22%" valign="top" class="vncell2">Enable</td>
				<td width="78%" class="vtable"><input name="http_inspect"
					type="checkbox" value="on"
					<?php if ($pconfig['http_inspect']=="on") echo "checked"; ?>
					onClick="enable_change(false)"> Use HTTP Inspect to
				Normalize/Decode and detect HTTP traffic and protocol anomalies.</td>
			</tr>
			<tr>
				<td valign="top" class="vncell2">HTTP server flow depth</td>
				<td class="vtable">
				<table cellpadding="0" cellspacing="0">
					<tr>
						<td><input name="flow_depth" type="text" class="formfld"
							id="flow_depth" size="5"
							value="<?=htmlspecialchars($pconfig['flow_depth']);?>"> <strong>-1</strong>
						to <strong>1460</strong> (<strong>-1</strong> disables HTTP
						inspect, <strong>0</strong> enables all HTTP inspect)</td>
					</tr>
				</table>
				Amount of HTTP server response payload to inspect. Snort's
				performance may increase by adjusting this value.<br>
				Setting this value too low may cause false negatives. Values above 0
				are specified in bytes. Default value is <strong>0</strong><br>
				</td>
			</tr>
			<tr>
				<td colspan="2" valign="top" class="listtopic">Stream5 Settings</td>
			</tr>
			<tr>
				<td valign="top" class="vncell2">Max Queued Bytes</td>
				<td class="vtable">
				<table cellpadding="0" cellspacing="0">
					<tr>
						<td><input name="max_queued_bytes" type="text" class="formfld"
							id="max_queued_bytes" size="5"
							value="<?=htmlspecialchars($pconfig['max_queued_bytes']);?>">
						Minimum is <strong>1024</strong>, Maximum is <strong>1073741824</strong>
						( default value is <strong>1048576</strong>, <strong>0</strong>
						means Maximum )</td>
					</tr>
				</table>
				The number of bytes to be queued for reassembly for TCP sessions in
				memory. Default value is <strong>1048576</strong><br>
				</td>
			</tr>
			<tr>
				<td valign="top" class="vncell2">Max Queued Segs</td>
				<td class="vtable">
				<table cellpadding="0" cellspacing="0">
					<tr>
						<td><input name="max_queued_segs" type="text" class="formfld"
							id="max_queued_segs" size="5"
							value="<?=htmlspecialchars($pconfig['max_queued_segs']);?>">
						Minimum is <strong>2</strong>, Maximum is <strong>1073741824</strong>
						( default value is <strong>2621</strong>, <strong>0</strong> means
						Maximum )</td>
					</tr>
				</table>
				The number of segments to be queued for reassembly for TCP sessions
				in memory. Default value is <strong>2621</strong><br>
				</td>
			</tr>
			<tr>
				<td colspan="2" valign="top" class="listtopic">General Preprocessor
				Settings</td>
			</tr>
			<tr>
				<td width="22%" valign="top" class="vncell2">Enable <br>
				RPC Decode and Back Orifice detector</td>
				<td width="78%" class="vtable"><input name="other_preprocs"
					type="checkbox" value="on"
					<?php if ($pconfig['other_preprocs']=="on") echo "checked"; ?>
					onClick="enable_change(false)"><br>
				Normalize/Decode RPC traffic and detects Back Orifice traffic on the
				network.</td>
			</tr>
			<tr>
				<td width="22%" valign="top" class="vncell2">Enable <br>
				FTP and Telnet Normalizer</td>
				<td width="78%" class="vtable"><input name="ftp_preprocessor"
					type="checkbox" value="on"
					<?php if ($pconfig['ftp_preprocessor']=="on") echo "checked"; ?>
					onClick="enable_change(false)"><br>
				Normalize/Decode FTP and Telnet traffic and protocol anomalies.</td>
			</tr>
			<tr>
				<td width="22%" valign="top" class="vncell2">Enable <br>
				SMTP Normalizer</td>
				<td width="78%" class="vtable"><input name="smtp_preprocessor"
					type="checkbox" value="on"
					<?php if ($pconfig['smtp_preprocessor']=="on") echo "checked"; ?>
					onClick="enable_change(false)"><br>
				Normalize/Decode SMTP protocol for enforcement and buffer overflows.</td>
			</tr>
			<tr>
				<td width="22%" valign="top" class="vncell2">Enable <br>
				Portscan Detection</td>
				<td width="78%" class="vtable"><input name="sf_portscan"
					type="checkbox" value="on"
					<?php if ($pconfig['sf_portscan']=="on") echo "checked"; ?>
					onClick="enable_change(false)"><br>
				Detects various types of portscans and portsweeps.</td>
			</tr>
			<tr>
				<td width="22%" valign="top" class="vncell2">Enable <br>
				DCE/RPC2 Detection</td>
				<td width="78%" class="vtable"><input name="dce_rpc_2"
					type="checkbox" value="on"
					<?php if ($pconfig['dce_rpc_2']=="on") echo "checked"; ?>
					onClick="enable_change(false)"><br>
				The DCE/RPC preprocessor detects and decodes SMB and DCE/RPC
				traffic.</td>
			</tr>
			<tr>
				<td width="22%" valign="top" class="vncell2">Enable <br>
				DNS Detection</td>
				<td width="78%" class="vtable"><input name="dns_preprocessor"
					type="checkbox" value="on"
					<?php if ($pconfig['dns_preprocessor']=="on") echo "checked"; ?>
					onClick="enable_change(false)"><br>
				The DNS preprocessor decodes DNS Response traffic and detects some
				vulnerabilities.</td>
			</tr>
			<tr>
				<td width="22%" valign="top" class="vncell2">Define SSL_IGNORE</td>
				<td width="78%" class="vtable"><input name="def_ssl_ports_ignore"
					type="text" class="formfld" id="def_ssl_ports_ignore" size="40"
					value="<?=htmlspecialchars($pconfig['def_ssl_ports_ignore']);?>"> <br>
				<span class="vexpl"> Encrypted traffic should be ignored by Snort
				for both performance reasons and to reduce false positives.<br>
				Default: "443 465 563 636 989 990 992 993 994 995".</span> <strong>Please
				use spaces and not commas.</strong></td>
			</tr>
			<tr>
				<td width="22%" valign="top">&nbsp;</td>
				<td width="78%">
					<input name="Submit" type="submit" class="formbtn" value="Save">
					<input name="id" type="hidden" value="<?=$id;?>"></td>
			</tr>
			<tr>
				<td width="22%" valign="top">&nbsp;</td>
				<td width="78%"><span class="vexpl"><span class="red"><strong>Note:</strong></span>
				<br>
				Please save your settings before you click Start. </td>
			</tr>
		</table>

</table>
</form>

</div>

					<?php include("fend.inc"); ?>
</body>
</html>