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Diffstat (limited to 'config/snort/snort_rules_flowbits.php')
| -rw-r--r-- | config/snort/snort_rules_flowbits.php | 265 |
1 files changed, 265 insertions, 0 deletions
diff --git a/config/snort/snort_rules_flowbits.php b/config/snort/snort_rules_flowbits.php new file mode 100644 index 00000000..104163f2 --- /dev/null +++ b/config/snort/snort_rules_flowbits.php @@ -0,0 +1,265 @@ +<?php +/* + * snort_rules_flowbits.php + * Copyright (C) 2004 Scott Ullrich + * Copyright (C) 2011-2012 Ermal Luci + * All rights reserved. + * + * originially part of m0n0wall (http://m0n0.ch/wall) + * Copyright (C) 2003-2004 Manuel Kasper <mk@neon1.net>. + * All rights reserved. + * + * modified for the pfsense snort package + * Copyright (C) 2009-2010 Robert Zelaya. + * 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.inc"); + +global $g, $flowbit_rules_file, $rebuild_rules; + +$snortdir = SNORTDIR; +$rules_map = array(); +$supplist = array(); + +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; +} + +$if_real = snort_get_real_interface($a_nat[$id]['interface']); +$snort_uuid = $a_nat[$id]['uuid']; + +/* We should normally never get to this page if Auto-Flowbits are disabled, but just in case... */ +if ($a_nat[$id]['autoflowbitrules'] == 'on') { + if (file_exists("{$snortdir}/snort_{$snort_uuid}_{$if_real}/rules/{$flowbit_rules_file}") && + filesize("{$snortdir}/snort_{$snort_uuid}_{$if_real}/rules/{$flowbit_rules_file}") > 0) { + $rules_map = snort_load_rules_map("{$snortdir}/snort_{$snort_uuid}_{$if_real}/rules/{$flowbit_rules_file}"); + } + else + $savemsg = "There are no flowbit-required rules necessary for the current enforcing rule set."; +} +else + $input_errors[] = "Auto-Flowbit rule generation is disabled for this interface!"; + +if ($_GET['act'] == "addsuppress" && is_numeric($_GET['sidid']) && is_numeric($_GET['gen_id'])) { + $descr = snort_get_msg($rules_map[$_GET['gen_id']][$_GET['sidid']]['rule']); + if (empty($descr)) + $suppress = "suppress gen_id {$_GET['gen_id']}, sig_id {$_GET['sidid']}\n"; + else + $suppress = "# {$descr}\nsuppress gen_id {$_GET['gen_id']}, sig_id {$_GET['sidid']}"; + if (!is_array($config['installedpackages']['snortglobal']['suppress'])) + $config['installedpackages']['snortglobal']['suppress'] = array(); + if (!is_array($config['installedpackages']['snortglobal']['suppress']['item'])) + $config['installedpackages']['snortglobal']['suppress']['item'] = array(); + $a_suppress = &$config['installedpackages']['snortglobal']['suppress']['item']; + + if (empty($a_nat[$id]['suppresslistname']) || $a_nat[$id]['suppresslistname'] == 'default') { + $s_list = array(); + $s_list['name'] = $a_nat[$id]['interface'] . "suppress"; + $s_list['uuid'] = uniqid(); + $s_list['descr'] = "Auto-generated list for alert suppression"; + $s_list['suppresspassthru'] = base64_encode($suppress); + $a_suppress[] = $s_list; + $a_nat[$id]['suppresslistname'] = $s_list['name']; + } else { + foreach ($a_suppress as $a_id => $alist) { + if ($alist['name'] == $a_nat[$id]['suppresslistname']) { + if (!empty($alist['suppresspassthru'])) { + $tmplist = base64_decode($alist['suppresspassthru']); + $tmplist .= "\n{$suppress}"; + $alist['suppresspassthru'] = base64_encode($tmplist); + $a_suppress[$a_id] = $alist; + } + } + } + } + write_config(); + $rebuild_rules = "off"; + sync_snort_package_config(); + $savemsg = "Wrote suppress rule for gen_id {$_GET['gen_id']}, sig_id {$_GET['sidid']} to the {$a_nat[$id]['suppresslistname']} Suppression List."; +} + +function truncate($string, $length) { + + /******************************** + * This function truncates the * + * passed string to the length * + * specified adding ellipsis if * + * truncation was necessary. * + ********************************/ + if (strlen($string) > $length) + $string = substr($string, 0, ($length - 3)) . "..."; + return $string; +} + +/* Load up an array with the current Suppression List GID,SID values */ +$supplist = snort_load_suppress_sigs($a_nat[$id]); + +$if_friendly = snort_get_friendly_interface($a_nat[$id]['interface']); +$pgtitle = "Services: Snort: {$if_friendly} Flowbit Rules"; +include_once("head.inc"); + +?> + +<body link="#0000CC" vlink="#0000CC" alink="#0000CC" > + +<?php +include("fbegin.inc"); +if($pfsense_stable == 'yes'){echo '<p class="pgtitle">' . $pgtitle . '</p>';} +if ($input_errors) print_input_errors($input_errors); +if ($savemsg) + print_info_box($savemsg); +?> +<form action="snort_rules_flowbits.php" method="post" name="iform" id="iform"> +<table width="100%" border="0" cellpadding="0" cellspacing="0"> +<tr><td class="tabcont"> +<table width="100%" border="0" cellpadding="6" cellspacing="0"> + <tr> + <td valign="middle" class="listtopic"><?php echo gettext("Auto-Generated Flowbit-Required Rules"); ?></td> + </tr> + <tr> + <td width="78%" class="vncell"> + <?php echo gettext("The rules listed below are required to be included in the rules set ") . + gettext("because they set flowbits that are checked and relied upon by rules in the enforcing rules set. ") . + gettext("If these dependent flowbits are not set, then some of your chosen rules may not fire. ") . + gettext("Enabling all the rules that set these dependent flowbits ensures your chosen rules fire as intended. ") . + gettext("Most flowbits rules contain the \"noalert\" keyword to prevent an alert from firing ") . + gettext("when the flowbit is detected. For those flowbit rules that do not contain the \"noalert\" option, click the ") . + gettext("icon displayed beside the Signature ID (SID) to add the alert to the Suppression List if desired."); ?></td> + </tr> + <tr> + <td valign="middle" class="listtopic"><?php echo gettext("Flowbit-Required Rules for {$if_friendly}"); ?></td> + </tr> + <tr> + <td width="78%" class="vncell"> + <table width="100%" border="0 cellspacing="2" cellpadding="0"> + <tr> + <td width="17px"><img src="../themes/<?=$g['theme']?>/images/icons/icon_plus.gif" width='12' height='12' border='0'/></td> + <td><span class="vexpl"><?php echo gettext("Alert is Not Suppressed"); ?></span></td> + <td rowspan="3" align="right"><input id="cancelbutton" name="cancelbutton" type="button" class="formbtn" onclick="history.back()" <?php + echo "value=\"" . gettext("Return") . "\" title=\"" . gettext("Return to previous page") . "\""; ?>/></td> + </tr> + <tr> + <td width="17px"><img src="../themes/<?=$g['theme']?>/images/icons/icon_plus_d.gif" width='12' height='12' border='0'/></td> + <td><span class="vexpl"><?php echo gettext("Alert has been Suppressed"); ?></span></td> + </tr> + <tr> + <td width="17px"> </td> + <td colspan="2" class="vexpl"><?php echo "<span class=\"red\"><strong>" . + gettext("Note: ") . "</strong></span>". gettext("the icon is only ") . + gettext("displayed for flowbit rules without the \"noalert\" option."); ?></td> + </tr> + </table> + </td> + </tr> + <tr> + <td> + <table id="myTable" width="100%" class="sortable" border="1" cellpadding="0" cellspacing="0"> + <thead> + <th width="12%" class="listhdrr" axis="number"><?php echo gettext("SID"); ?></th> + <td width="10%" class="listhdrr" axis="string"><?php echo gettext("Proto"); ?></th> + <th width="14%" class="listhdrr" axis="string"><?php echo gettext("Source"); ?></th> + <th width="14%" class="listhdrr" axis="string"><?php echo gettext("Destination"); ?></th> + <th width="20%" class="listhdrr" axis="string"><?php echo gettext("Flowbits"); ?></th> + <th class="listhdrr" axis="string"><?php echo gettext("Message"); ?></th> + <thead> + <tbody> + <?php + $count = 0; + foreach ($rules_map as $k1 => $rulem) { + foreach ($rulem as $k2 => $v) { + $sid = snort_get_sid($v['rule']); + $gid = snort_get_gid($v['rule']); + + // Pick off the first section of the rule (prior to the start of the MSG field), + // and then use a REGX split to isolate the remaining fields into an array. + $tmp = substr($v['rule'], 0, strpos($v['rule'], "(")); + $tmp = trim(preg_replace('/^\s*#+\s*/', '', $tmp)); + $rule_content = preg_split('/[\s]+/', $tmp); + + $protocol = $rule_content[1]; //protocol + $source = truncate($rule_content[2], 14); //source + $destination = truncate($rule_content[5], 14); //destination + $message = snort_get_msg($v['rule']); + $flowbits = implode("; ", snort_get_flowbits($v['rule'])); + if (strstr($flowbits, "noalert")) + $supplink = ""; + else { + if (!isset($supplist[$gid][$sid])) { + $supplink = "<a href=\"?id={$id}&act=addsuppress&sidid={$sid}&gen_id={$gid}\">"; + $supplink .= "<img src=\"../themes/{$g['theme']}/images/icons/icon_plus.gif\""; + $supplink .= "width='12' height='12' border='0' title='"; + $supplink .= gettext("Click to add to Suppress List") . "'/></a>"; + } + else { + $supplink .= "<img src=\"../themes/{$g['theme']}/images/icons/icon_plus_d.gif\""; + $supplink .= "width='12' height='12' border='0' title='"; + $supplink .= gettext("Alert has been suppressed") . "'/>"; + } + } + + // Use "echo" to write the table HTML row-by-row. + echo "<tr>" . + "<td width=\"12%\" class=\"listr\">{$sid} {$supplink}</td>" . + "<td width=\"10%\" class=\"listr\">{$protocol}</td>" . + "<td width=\"14%\" class=\"listr\">{$source}</td>" . + "<td width=\"14%\" class=\"listr\">{$destination}</td>" . + "<td width=\"20%\" class=\"listr\" style=\"word-wrap:break-word; word-break:normal;\">{$flowbits}</td>" . + "<td class=\"listr\" style=\"word-wrap:break-word; word-break:normal;\">{$message}</td>" . + "</tr>"; + $count++; + } + } + unset($rulem, $v); + ?> + </tbody> + </table> + </td> + </tr> + <?php if ($count > 20): ?> + <tr> + <td align="center" valign="middle"> + <input id="cancelbutton" name="cancelbutton" type="button" class="formbtn" onclick="history.back()" <?php + echo "value=\"" . gettext("Return") . "\" title=\"" . gettext("Return to previous page") . "\""; ?>/> + <input name="id" type="hidden" value="<?=$id;?>" /> + </td> + </tr> + <?php endif; ?> +</table> +</td></tr> +</table> +</form> +<?php include("fend.inc"); ?> +</body> +</html> |