From 31905aef52131b7067441f8f7902b343a4588f72 Mon Sep 17 00:00:00 2001
From: bmeeks8 <bmeeks8@bellsouth.net>
Date: Tue, 9 Apr 2013 20:10:36 -0400
Subject: Update Snort to 2.5.5 - New features and bug fixes

---
 config/snort/snort_preprocessors.php | 103 ++++++++++++++++++++++++++++-------
 1 file changed, 84 insertions(+), 19 deletions(-)

(limited to 'config/snort/snort_preprocessors.php')

diff --git a/config/snort/snort_preprocessors.php b/config/snort/snort_preprocessors.php
index 7d0348e9..5cd5a408 100755
--- a/config/snort/snort_preprocessors.php
+++ b/config/snort/snort_preprocessors.php
@@ -34,7 +34,12 @@
 require_once("guiconfig.inc");
 require_once("/usr/local/pkg/snort/snort.inc");
 
-global $g;
+global $g, $rebuild_rules;
+
+if (!is_array($config['installedpackages']['snortglobal'])) {
+	$config['installedpackages']['snortglobal'] = array();
+}
+$vrt_enabled = $config['installedpackages']['snortglobal']['snortdownload'];
 
 if (!is_array($config['installedpackages']['snortglobal']['rule'])) {
 	$config['installedpackages']['snortglobal']['rule'] = array();
@@ -77,6 +82,13 @@ if (isset($id) && $a_nat[$id]) {
 	$pconfig['dnp3_preproc'] = $a_nat[$id]['dnp3_preproc'];
 	$pconfig['modbus_preproc'] = $a_nat[$id]['modbus_preproc'];
 	$pconfig['gtp_preproc'] = $a_nat[$id]['gtp_preproc'];
+	$pconfig['preproc_auto_rule_disable'] = $a_nat[$id]['preproc_auto_rule_disable'];
+	$pconfig['protect_preproc_rules'] = $a_nat[$id]['protect_preproc_rules'];
+
+	/* If not using the Snort VRT rules, then disable */
+	/* the Sensitive Data (sdf) preprocessor.         */
+	if ($vrt_enabled == "off")
+		$pconfig['sensitive_data'] = "off";
 }
 
 if ($_POST) {
@@ -120,6 +132,8 @@ if ($_POST) {
 		$natent['sip_preproc'] = $_POST['sip_preproc'] ? 'on' : 'off';
 		$natent['modbus_preproc'] = $_POST['modbus_preproc'] ? 'on' : 'off';
 		$natent['gtp_preproc'] = $_POST['gtp_preproc'] ? 'on' : 'off';
+		$natent['preproc_auto_rule_disable'] = $_POST['preproc_auto_rule_disable'] ? 'on' : 'off';
+		$natent['protect_preproc_rules'] = $_POST['protect_preproc_rules'] ? 'on' : 'off';
 
 		if (isset($id) && $a_nat[$id])
 			$a_nat[$id] = $natent;
@@ -132,8 +146,15 @@ if ($_POST) {
 
 		write_config();
 
-		$if_real = snort_get_real_interface($pconfig['interface']);
-		sync_snort_package_config();
+		/* Set flag to rebuild rules for this interface  */
+		$rebuild_rules = "on";
+
+		/*************************************************/
+		/* Update the snort conf file and rebuild the    */
+		/* rules for this interface.                     */
+		/*************************************************/
+		snort_generate_conf($natent);
+		$rebuild_rules = "off";
 
 		/* after click go to this page */
 		header( 'Expires: Sat, 26 Jul 1997 05:00:00 GMT' );
@@ -191,22 +212,58 @@ include_once("head.inc");
 <tr><td class="tabcont">
 <table width="100%" border="0" cellpadding="6" cellspacing="0">
 	<tr>
-		<td colspan="2" align="center" valign="middle">
-		<span class="red"><strong><?php echo gettext("NOTE"); ?></strong></span><br>
+		<td colspan="2" align="left" valign="middle">
 		<?php echo gettext("Rules may be dependent on preprocessors!  Disabling preprocessors may result in "); ?>
-		<?php echo gettext("dependent rules being automatically disabled."); ?><br>
-		<?php echo gettext("Defaults will be used when there is no user input."); ?><br></td>
+		<?php echo gettext("Snort start failures unless dependent rules are also disabled."); ?>
+		<?php echo gettext("The Auto-Rule Disable feature can be used, but note the warning about compromising protection.  " . 
+		"Defaults will be used where no user input is provided."); ?></td>
 	</tr>
 	<tr>
-		<td colspan="2" valign="top" class="listtopic"><?php echo gettext("Performance Statistics"); ?></td>
+
+		<td colspan="2" valign="top" class="listtopic"><?php echo gettext("Preprocessors Configuration"); ?></td>
 	</tr>
 	<tr>
 		<td width="22%" valign="top" class="vncell"><?php echo gettext("Enable"); ?></td>
-		<td width="78%" class="vtable"><input name="perform_stat"
-			type="checkbox" value="on"
+		<td width="78%" class="vtable"><input name="perform_stat" type="checkbox" value="on" 
 			<?php if ($pconfig['perform_stat']=="on") echo "checked"; ?>
 			onClick="enable_change(false)"> <?php echo gettext("Collect Performance Statistics for this interface."); ?></td>
 	</tr>
+	<tr>
+		<td width="22%" valign="top" class="vncell"><?php echo gettext("Protect Customized Preprocessor Rules"); ?></td>
+		<td width="78%" class="vtable"><input name="protect_preproc_rules" type="checkbox" value="on" 
+			<?php if ($pconfig['protect_preproc_rules']=="on") echo "checked "; 
+			if ($vrt_enabled <> 'on') echo "disabled"; ?>
+			onClick="enable_change(false)"> <?php echo gettext("Check this box if you maintain customized preprocessor text rules files for this interface."); ?>
+			<table width="100%" border="0" cellpadding="2" cellpadding="2">
+				<tr>
+					<td width="3%">&nbsp;</td>
+					<td><?php echo gettext("Enable this only if you use customized preprocessor text rules files and " . 
+					"you do not want them overwritten by automatic Snort VRT rule updates.  " . 
+					"This option is disabled when Snort VRT rules download is not enabled on the Global Settings tab."); ?><br/><br/>
+					<?php printf(gettext("%sHint:%s  Most users should leave this unchecked."), '<span class="red"><strong>', '</strong></span>'); ?></span></td>
+				</tr>
+			</table>
+		</td>
+	</tr>
+	<tr>
+		<td width="22%" valign="top" class="vncell"><?php echo gettext("Auto Rule Disable"); ?></td>
+		<td width="78%" class="vtable"><input name="preproc_auto_rule_disable" type="checkbox" value="on" 
+			<?php if ($pconfig['preproc_auto_rule_disable']=="on") echo "checked"; ?>
+			onClick="enable_change(false)"> <?php echo gettext("Auto-disable text rules dependent on disabled preprocessors for this interface.  "); 
+			echo gettext("Default is ") . '<strong>' . gettext("Not Checked."); ?></strong><br/>
+			<table width="100%" border="0" cellpadding="2" cellpadding="2">
+				<tr>
+					<td width="3%">&nbsp;</td>
+					<td><span class="red"><strong><?php echo gettext("Warning:  "); ?></strong></span>
+					<?php echo gettext("Enabling this option allows Snort to automatically disable any text rules " . 
+					"containing rule options or content modifiers that are dependent upon the preprocessors " . 
+					"you have not enabled.  This may facilitate starting Snort without errors related to " . 
+					"disabled preprocessors, but can substantially compromise the level of protection by " .
+					"automatically disabling detection rules."); ?></td>
+				</tr>
+			</table>
+		</td>
+	</tr>
 	<tr>
 		<td colspan="2" valign="top" class="listtopic"><?php echo gettext("HTTP Inspect Settings"); ?></td>
 	</tr>
@@ -214,9 +271,10 @@ include_once("head.inc");
 		<td width="22%" valign="top" class="vncell"><?php echo gettext("Enable"); ?></td>
 		<td width="78%" class="vtable"><input name="http_inspect"
 			type="checkbox" value="on"
-			<?php if ($pconfig['http_inspect']=="on") echo "checked"; ?>
+			<?php if ($pconfig['http_inspect']=="on" || empty($pconfig['http_inspect'])) echo "checked"; ?>
 			onClick="enable_change(false)"> <?php echo gettext("Use HTTP Inspect to " .
-				"Normalize/Decode and detect HTTP traffic and protocol anomalies."); ?></td>
+				"Normalize/Decode and detect HTTP traffic and protocol anomalies.  Default is "); ?>
+			<strong><?php echo gettext("Checked."); ?></strong></td>
 	</tr>
 	<tr>
 		<td valign="top" class="vncell"><?php echo gettext("HTTP server flow depth"); ?></td>
@@ -241,7 +299,7 @@ include_once("head.inc");
 		<td width="78%" class="vtable">
 			<select name="http_server_profile" class="formselect" id="http_server_profile">
 			<?php
-			$profile = array('All', 'Apache', 'IIS', 'IIS_4.0', 'IIS_5.0');
+			$profile = array('All', 'Apache', 'IIS', 'IIS4_0', 'IIS5_0');
 			foreach ($profile as $val): ?>
 			<option value="<?=strtolower($val);?>"
 			<?php if (strtolower($val) == $pconfig['http_server_profile']) echo "selected"; ?>>
@@ -275,9 +333,10 @@ include_once("head.inc");
 		<td width="22%" valign="top" class="vncell"><?php echo gettext("Disable HTTP Alerts"); ?></td>
 		<td width="78%" class="vtable"><input name="noalert_http_inspect"
 			type="checkbox" value="on"
-			<?php if ($pconfig['noalert_http_inspect']=="on") echo "checked"; ?>
-			onClick="enable_change(false)"> <?php echo gettext("Tick to turn off alerts from the HTTP Inspect " .
-				"preprocessor.  This has no effect on HTTP rules in the rule set."); ?></td>
+			<?php if ($pconfig['noalert_http_inspect']=="on" || empty($pconfig['noalert_http_inspect'])) echo "checked"; ?>
+			onClick="enable_change(false)"> <?php echo gettext("Turn off alerts from HTTP Inspect " .
+				"preprocessor.  This has no effect on HTTP rules.  Default is "); ?>
+			<strong><?php echo gettext("Checked."); ?></strong></td>
 	</tr>
 	<tr>
 		<td colspan="2" valign="top" class="listtopic"><?php echo gettext("Stream5 Settings"); ?></td>
@@ -469,9 +528,14 @@ include_once("head.inc");
 		<td width="22%" valign="top" class="vncell"><?php echo gettext("Enable"); ?> <br> <?php echo gettext("Sensitive Data"); ?></td>
 		<td width="78%" class="vtable">
 			<input name="sensitive_data" type="checkbox" value="on"
-			<?php if ($pconfig['sensitive_data']=="on") echo "checked"; ?>
+			<?php if ($pconfig['sensitive_data'] == "on")
+				 echo "checked";
+			      elseif ($vrt_enabled == "off")
+				 echo "disabled";
+			?>
 			onClick="enable_change(false)"><br>
-		<?php echo gettext("Sensitive data searches for credit card or Social Security numbers in data"); ?>	
+		<?php echo gettext("Sensitive data searches for credit card or Social Security numbers and e-mail addresses in data."); ?><br/>
+		<span class="red"><strong><?php echo gettext("Note: "); ?></strong></span><?php echo gettext("To enable this preprocessor, you must select the Snort VRT rules on the Global Settings tab."); ?>	
 		</td>
 	</tr>
 	<tr>
@@ -507,7 +571,8 @@ include_once("head.inc");
 				<td width="22%" valign="top">&nbsp;</td>
 				<td width="78%"><span class="vexpl"><span class="red"><strong><?php echo gettext("Note:"); ?></strong></span>
 				<br>
-				<?php echo gettext("Please save your settings before you click Start."); ?> </td>
+				<?php echo gettext("Please save your settings before you click Start.  Preprocessor changes will rebuild the rules file.  "); ?>
+				</br><?php echo gettext("This may take several seconds.  Snort must also be restarted to activate any changes made on this screen."); ?></td>
 			</tr>
 </table>
 </td></tr></table>
-- 
cgit v1.2.3