diff options
Diffstat (limited to 'config/snort/snort.inc')
| -rwxr-xr-x | config/snort/snort.inc | 1440 |
1 files changed, 924 insertions, 516 deletions
diff --git a/config/snort/snort.inc b/config/snort/snort.inc index d69f6237..79fef4fa 100755 --- a/config/snort/snort.inc +++ b/config/snort/snort.inc @@ -5,6 +5,7 @@ * Copyright (C) 2006 Scott Ullrich * Copyright (C) 2009-2010 Robert Zelaya * Copyright (C) 2011-2012 Ermal Luci + * Copyright (C) 2013 Bill Meeks * part of pfSense * All rights reserved. * @@ -43,22 +44,24 @@ require_once("filter.inc"); ini_set("memory_limit", "192M"); // Explicitly declare this as global so it works through function call includes -global $rebuild_rules; +global $rebuild_rules, $pfSense_snort_version; + +// Grab the Snort binary version programmatically, but if that fails use a safe default +$snortver = array(); +exec("/usr/local/bin/snort -V 2>&1 |/usr/bin/grep Version | /usr/bin/cut -c20-26", $snortver); +$snort_version = $snortver[0]; +if (empty($snort_version)) + $snort_version = "2.9.5.5"; /* package version */ -$snort_version = "2.9.4.6"; -$pfSense_snort_version = "2.6.0"; -$snort_package_version = "Snort {$snort_version} pkg v. {$pfSense_snort_version}"; - -// Define SNORTDIR and SNORTLIBDIR constants according to FreeBSD version (PBI support or no PBI) -if (floatval(php_uname("r")) >= 8.3) { - exec("/usr/local/sbin/pbi_info | grep 'snort-{$snort_version}' | xargs /usr/local/sbin/pbi_info | awk '/Prefix/ {print $2}'",$pbidirarray); - $snort_pbidir = "{$pbidirarray[0]}"; - /* In case this is an initial Snort install and pbi_info() above returned null, set a sane default value */ - if (empty($snort_pbidir)) - $snort_pbidir = "/usr/pbi/snort-" . php_uname("m"); - define("SNORTDIR", "{$snort_pbidir}/etc/snort"); - define("SNORTLIBDIR", "{$snort_pbidir}/lib/snort"); +$pfSense_snort_version = "3.0.1"; +$snort_package_version = "Snort {$snort_version} pkg v{$pfSense_snort_version}"; + +// Define SNORTDIR and SNORTLIBDIR constants according to pfSense version +$pfs_version=substr(trim(file_get_contents("/etc/version")),0,3); +if ($pfs_version > 2.0) { + define("SNORTDIR", "/usr/pbi/snort-" . php_uname("m") . "/etc/snort"); + define("SNORTLIBDIR", "/usr/pbi/snort-" . php_uname("m") . "/lib/snort"); } else { define("SNORTDIR", "/usr/local/etc/snort"); @@ -66,16 +69,18 @@ else { } /* Define some useful constants for Snort */ +/* Be sure to include trailing slash on the URL defines */ define("SNORTLOGDIR", "/var/log/snort"); -define("VRT_DNLD_FILENAME", "snortrules-snapshot-2946.tar.gz"); -define("VRT_DNLD_URL", "https://www.snort.org/reg-rules/"); -define("ET_VERSION", "2.9.0"); define("ET_DNLD_FILENAME", "emerging.rules.tar.gz"); +define("ETPRO_DNLD_FILENAME", "etpro.rules.tar.gz"); define("GPLV2_DNLD_FILENAME", "community-rules.tar.gz"); -define("GPLV2_DNLD_URL", "https://s3.amazonaws.com/snort-org/www/rules/community/"); define("FLOWBITS_FILENAME", "flowbit-required.rules"); define("ENFORCING_RULES_FILENAME", "snort.rules"); define("RULES_UPD_LOGFILE", SNORTLOGDIR . "/snort_rules_update.log"); +define("VRT_FILE_PREFIX", "snort_"); +define("GPL_FILE_PREFIX", "GPLv2_"); +define("ET_OPEN_FILE_PREFIX", "emerging-"); +define("ET_PRO_FILE_PREFIX", "etpro-"); /* Rebuild Rules Flag -- if "true", rebuild enforcing rules and flowbit-rules files */ $rebuild_rules = false; @@ -83,81 +88,6 @@ $rebuild_rules = false; if (!is_array($config['installedpackages']['snortglobal'])) $config['installedpackages']['snortglobal'] = array(); -function snort_get_alias_value($alias) { - /***************************************************/ - /* This function returns the value of the passed */ - /* Alias, or an empty string if the value cannot */ - /* be determined. */ - /* */ - /* On Entry: $alias ==> Alias to be evaluated */ - /* Returns: Alias value as a string or an empty */ - /* string */ - /***************************************************/ - - global $config; - - $entries = array(); - $tmp = ""; - - // If no Aliases are defined in the configuration, - // return an empty string. - if (empty($config['aliases'])) - return $tmp; - - // See if we were passed a valid Alias and return - // an empty string if not. - if (!is_alias($alias)) - return $tmp; - - // We have a valid Alias, so find its value or - // values and return as a string. - return snort_unpack_alias($alias); -} - -function snort_unpack_alias($alias) { - - /**************************************************/ - /* This function unpacks an Alias to determine */ - /* the actual values it represents. Any nested */ - /* Aliases encountered are also unpacked via */ - /* recursive calls to this function. */ - /* */ - /* Fully-qualified-domain-name (FQDN) aliases */ - /* are detected and resolved via a pfctl() call. */ - /**************************************************/ - - global $config; - $value = ""; - - // Find the matching Alias entry in config - foreach ($config['aliases']['alias'] as $aliased) { - if($aliased['name'] == $alias) { - $addr = array(); - $addr = explode(" ", trim($aliased['address'])); - foreach ($addr as $a) { - if (!is_alias($a) && !empty($a)) { - if (is_ipaddr($a) || is_subnet($a) || is_port($a)) - // If address, subnet or port, we found the final value - $value .= $a . " "; - elseif (is_hostname($a)) { - // Found a FQDN value for this Alias, so resolve it - $entries = array(); - exec("/sbin/pfctl -t " . escapeshellarg($alias) . " -T show", $entries); - $value .= trim(implode(" ", $entries)); - } - else - continue; - } - elseif (is_alias($a)) - // Found a nested Alias, so recursively resolve it - $value .= snort_unpack_alias($a) . " "; - } - return trim($value); - } - } - return $value; -} - function snort_is_single_addr_alias($alias) { /***************************************************/ /* This function evaluates the passed Alias to */ @@ -172,12 +102,52 @@ function snort_is_single_addr_alias($alias) { /***************************************************/ /* If spaces in expanded Alias, it's not a single entity */ - if (strpos(snort_get_alias_value($alias), " ") !== false) + if (strpos(trim(filter_expand_alias($alias)), " ") !== false) return false; else return true; } +function snort_expand_port_range($ports, $delim = ',') { + /**************************************************/ + /* This function examines the passed ports string */ + /* and expands any embedded port ranges into the */ + /* individual ports separated by the specified */ + /* delimiter. A port range is indicated by a */ + /* colon in the string. */ + /* */ + /* On Entry: $ports ==> string to be evaluated */ + /* with {$delim} separating */ + /* the port values. */ + /* Returns: string with any encountered port */ + /* ranges expanded and the values */ + /* delimited by {$delim}. */ + /**************************************************/ + + $value = ""; + + // Split the incoming string on the specified delimiter + $tmp = explode($delim, $ports); + + // Look for any included port range and expand it + foreach ($tmp as $val) { + if (is_portrange($val)) { + $start = strtok($val, ":"); + $end = strtok(":"); + if ($end !== false) { + $val = $start . $delim; + for ($i = intval($start) + 1; $i < intval($end); $i++) + $val .= strval($i) . $delim; + $val .= $end; + } + } + $value .= $val . $delim; + } + + // Remove any trailing delimiter in return value + return trim($value, $delim); +} + function snort_get_blocked_ips() { $blocked_ips = ""; exec('/sbin/pfctl -t snort2c -T show', $blocked_ips); @@ -358,9 +328,8 @@ function snort_build_list($snortcfg, $listname = "", $whitelist = false) { $wandns = $list['wandnsips']; $vips = $list['vips']; $vpns = $list['vpnips']; - if (!empty($list['address']) && is_alias($list['address'])) { - $home_net = explode(" ", trim(snort_get_alias_value($list['address']))); - } + if (!empty($list['address']) && is_alias($list['address'])) + $home_net = explode(" ", trim(filter_expand_alias($list['address']))); } /* Always add loopback to HOME_NET and whitelist (ftphelper) */ @@ -613,7 +582,7 @@ function snort_reload_config($snortcfg, $signal="SIGHUP") { /* can find a valid PID for the process. */ /******************************************************/ if (file_exists("{$g['varrun_path']}/snort_{$if_real}{$snort_uuid}.pid") && isvalidpid("{$g['varrun_path']}/snort_{$if_real}{$snort_uuid}.pid")) { - log_error("[Snort] Snort RELOAD CONFIG for {$snortcfg['descr']}({$if_real})..."); + log_error("[Snort] Snort RELOAD CONFIG for {$snortcfg['descr']} ({$if_real})..."); exec("/bin/pkill -{$signal} -F {$g['varrun_path']}/snort_{$if_real}{$snort_uuid}.pid 2>&1 &"); } } @@ -701,78 +670,6 @@ function snort_post_delete_logs($snort_uuid = 0) { } } -function snort_postinstall() { - global $config, $g, $rebuild_rules, $pkg_interface, $snort_gui_include; - - $snortdir = SNORTDIR; - $snortlibdir = SNORTLIBDIR; - $rcdir = RCFILEPREFIX; - - /* Set flag for post-install in progress */ - $g['snort_postinstall'] = true; - - /* cleanup default files */ - @rename("{$snortdir}/snort.conf-sample", "{$snortdir}/snort.conf"); - @rename("{$snortdir}/threshold.conf-sample", "{$snortdir}/threshold.conf"); - @rename("{$snortdir}/sid-msg.map-sample", "{$snortdir}/sid-msg.map"); - @rename("{$snortdir}/unicode.map-sample", "{$snortdir}/unicode.map"); - @rename("{$snortdir}/classification.config-sample", "{$snortdir}/classification.config"); - @rename("{$snortdir}/generators-sample", "{$snortdir}/generators"); - @rename("{$snortdir}/reference.config-sample", "{$snortdir}/reference.config"); - @rename("{$snortdir}/gen-msg.map-sample", "{$snortdir}/gen-msg.map"); - - /* fix up the preprocessor rules filenames from a PBI package install */ - $preproc_rules = array("decoder.rules", "preprocessor.rules", "sensitive-data.rules"); - foreach ($preproc_rules as $file) { - if (file_exists("{$snortdir}/preproc_rules/{$file}-sample")) - @rename("{$snortdir}/preproc_rules/{$file}-sample", "{$snortdir}/preproc_rules/{$file}"); - } - - /* Remove any previously installed scripts since we rebuild them */ - @unlink("{$snortdir}/sid"); - @unlink("{$rcdir}/snort.sh"); - @unlink("{$rcdir}/barnyard2"); - - /* remove example library files */ - $files = glob("{$snortlibdir}/dynamicrules/*_example*"); - foreach ($files as $f) - @unlink($f); - $files = glob("{$snortlibdir}/dynamicpreprocessor/*_example*"); - foreach ($files as $f) - @unlink($f); - - /* remake saved settings */ - if ($config['installedpackages']['snortglobal']['forcekeepsettings'] == 'on') { - log_error(gettext("[Snort] Saved settings detected... rebuilding installation with saved settings...")); - update_status(gettext("Saved settings detected...")); - update_output_window(gettext("Please wait... rebuilding installation with saved settings...")); - log_error(gettext("[Snort] Downloading and updating configured rule types...")); - update_output_window(gettext("Please wait... downloading and updating configured rule types...")); - if ($pkg_interface <> "console") - $snort_gui_include = true; - @include_once("/usr/local/pkg/snort/snort_check_for_rule_updates.php"); - update_status(gettext("Generating snort.conf configuration file from saved settings...")); - $rebuild_rules = true; - sync_snort_package_config(); - $rebuild_rules = false; - update_output_window(gettext("Finished rebuilding files...")); - log_error(gettext("[Snort] Finished rebuilding installation from saved settings...")); - - /* Only try to start Snort if not in reboot */ - if (!$g['booting']) { - update_status(gettext("Starting Snort using rebuilt configuration...")); - update_output_window(gettext("Please wait... while Snort is started...")); - log_error(gettext("[Snort] Starting Snort using rebuilt configuration...")); - update_output_window(gettext("Snort has been started using the rebuilt configuration...")); - start_service("snort"); - } - } - - /* Done with post-install, so clear flag */ - unset($g['snort_postinstall']); - log_error(gettext("[Snort] Package post-installation tasks completed...")); -} - function snort_Getdirsize($node) { if(!is_readable($node)) return false; @@ -801,7 +698,6 @@ function snort_snortloglimit_install_cron($should_install) { switch($should_install) { case true: if(!$is_installed) { - $cron_item = array(); $cron_item['minute'] = "*/5"; $cron_item['hour'] = "*"; @@ -838,6 +734,22 @@ function snort_rm_blocked_install_cron($should_install) { } $snort_rm_blocked_info_ck = $config['installedpackages']['snortglobal']['rm_blocked']; + if ($snort_rm_blocked_info_ck == "15m_b") { + $snort_rm_blocked_min = "*/2"; + $snort_rm_blocked_hr = "*"; + $snort_rm_blocked_mday = "*"; + $snort_rm_blocked_month = "*"; + $snort_rm_blocked_wday = "*"; + $snort_rm_blocked_expire = "900"; + } + if ($snort_rm_blocked_info_ck == "30m_b") { + $snort_rm_blocked_min = "*/5"; + $snort_rm_blocked_hr = "*"; + $snort_rm_blocked_mday = "*"; + $snort_rm_blocked_month = "*"; + $snort_rm_blocked_wday = "*"; + $snort_rm_blocked_expire = "1800"; + } if ($snort_rm_blocked_info_ck == "1h_b") { $snort_rm_blocked_min = "*/5"; $snort_rm_blocked_hr = "*"; @@ -1087,13 +999,13 @@ function snort_build_sid_msg_map($rules_path, $sid_file) { /* sid-msg.map file for use by Snort and/or barnyard2. */ /*************************************************************/ - $sidMap = array(); + $sidMap = array(); $rule_files = array(); - /* First check if we were passed a directory, a single file */ - /* or an array of filenames to read. Set our $rule_files */ - /* variable accordingly. If we can't figure it out, return */ - /* and don't write a sid_msg_map file. */ + /* First check if we were passed a directory, a single file */ + /* or an array of filenames to read. Set our $rule_files */ + /* variable accordingly. If we can't figure it out, return */ + /* and don't write a sid_msg_map file. */ if (is_string($rules_path)) { if (is_dir($rules_path)) $rule_files = glob($rules_path . "*.rules"); @@ -1105,71 +1017,71 @@ function snort_build_sid_msg_map($rules_path, $sid_file) { else return; - /* Read the rule files into an array, then iterate the list */ - foreach ($rule_files as $file) { + /* Read the rule files into an array, then iterate the list */ + foreach ($rule_files as $file) { - /* Don't process files with "deleted" in the filename */ - if (stristr($file, "deleted")) - continue; + /* Don't process files with "deleted" in the filename */ + if (stristr($file, "deleted")) + continue; - /* Read the file into an array, skipping missing files. */ - if (!file_exists($file)) + /* Read the file into an array, skipping missing files. */ + if (!file_exists($file)) continue; - $rules_array = file($file, FILE_SKIP_EMPTY_LINES); - $record = ""; - $b_Multiline = false; - - /* Read and process each line from the rules in the */ - /* current file. */ - foreach ($rules_array as $rule) { - - /* Skip any non-rule lines unless we're in */ - /* multiline mode. */ - if (!preg_match('/^\s*#*\s*(alert|drop|pass)/i', $rule) && !$b_Multiline) - continue; - - /* Test for a multi-line rule, and reassemble the */ - /* pieces back into a single line. */ - if (preg_match('/\\\\s*[\n]$/m', $rule)) { - $rule = substr($rule, 0, strrpos($rule, '\\')); - $record .= $rule; - $b_Multiline = true; - continue; - } - /* If the last segment of a multiline rule, then */ - /* append it onto the previous parts to form a */ - /* single-line rule for further processing below. */ - elseif (!preg_match('/\\\\s*[\n]$/m', $rule) && $b_Multiline) { - $record .= $rule; - $rule = $record; - } - $b_Multiline = false; - $record = ""; - - /* Parse the rule to find sid and any references. */ - $sid = ''; - $msg = ''; - $matches = ''; - $sidEntry = ''; - if (preg_match('/\bmsg\s*:\s*"(.+?)"\s*;/i', $rule, $matches)) - $msg = trim($matches[1]); - if (preg_match('/\bsid\s*:\s*(\d+)\s*;/i', $rule, $matches)) - $sid = trim($matches[1]); - if (!empty($sid) && !empty($msg)) { - $sidEntry = $sid . ' || ' . $msg; - preg_match_all('/\breference\s*:\s*([^\;]+)/i', $rule, $matches); - foreach ($matches[1] as $ref) - $sidEntry .= " || " . trim($ref); - $sidEntry .= "\n"; - $sidMap[$sid] = $sidEntry; - } - } + $rules_array = file($file, FILE_SKIP_EMPTY_LINES); + $record = ""; + $b_Multiline = false; + + /* Read and process each line from the rules in the current file */ + foreach ($rules_array as $rule) { + + /* Skip any non-rule lines unless we're in multiline mode. */ + if (!preg_match('/^\s*#*\s*(alert|drop|pass)/i', $rule) && !$b_Multiline) + continue; + + /* Test for a multi-line rule, and reassemble the */ + /* pieces back into a single line. */ + if (preg_match('/\\\\s*[\n]$/m', $rule)) { + $rule = substr($rule, 0, strrpos($rule, '\\')); + $record .= $rule; + $b_Multiline = true; + continue; + } + /* If the last segment of a multiline rule, then */ + /* append it onto the previous parts to form a */ + /* single-line rule for further processing below. */ + elseif (!preg_match('/\\\\s*[\n]$/m', $rule) && $b_Multiline) { + $record .= $rule; + $rule = $record; + } + $b_Multiline = false; + $record = ""; + + /* Parse the rule to find sid and any references. */ + $sid = ''; + $msg = ''; + $matches = ''; + $sidEntry = ''; + if (preg_match('/\bmsg\s*:\s*"(.+?)"\s*;/i', $rule, $matches)) + $msg = trim($matches[1]); + if (preg_match('/\bsid\s*:\s*(\d+)\s*;/i', $rule, $matches)) + $sid = trim($matches[1]); + if (!empty($sid) && !empty($msg)) { + $sidEntry = $sid . ' || ' . $msg; + preg_match_all('/\breference\s*:\s*([^\;]+)/i', $rule, $matches); + foreach ($matches[1] as $ref) + $sidEntry .= " || " . trim($ref); + $sidEntry .= "\n"; + if (!is_array($sidMap[$sid])) + $sidMap[$sid] = array(); + $sidMap[$sid] = $sidEntry; + } + } } - /* Sort the generated sid-msg map by sid */ - ksort($sidMap); + /* Sort the generated sid-msg map by sid */ + ksort($sidMap); - /* Now print the result to the supplied file */ + /* Now print the result to the supplied file */ @file_put_contents($sid_file, array_values($sidMap)); } @@ -1194,8 +1106,11 @@ function snort_merge_reference_configs($cfg_in, $cfg_out) { if (preg_match('/(\:)\s*(\w+)\s*(.*)/', $line, $matches)) { if (!empty($matches[2]) && !empty($matches[3])) { $matches[2] = trim($matches[2]); - if (!array_key_exists($matches[2], $outMap)) + if (!array_key_exists($matches[2], $outMap)) { + if (!is_array($outMap[$matches[2]])) + $outMap[$matches[2]] = array(); $outMap[$matches[2]] = trim($matches[3]); + } } } } @@ -1239,8 +1154,11 @@ function snort_merge_classification_configs($cfg_in, $cfg_out) { continue; if (!empty($matches[2]) && !empty($matches[3]) && !empty($matches[4])) { $matches[2] = trim($matches[2]); - if (!array_key_exists($matches[2], $outMap)) + if (!array_key_exists($matches[2], $outMap)) { + if (!is_array($outMap[$matches[2]])) + $outMap[$matches[2]] = array(); $outMap[$matches[2]] = trim($matches[3]) . "," . trim($matches[4]); + } } } } @@ -1503,8 +1421,11 @@ function snort_get_checked_flowbits($rules_map) { if ($action == "isset" || $action == "isnotset") { $target = preg_split('/[&|]/', substr($flowbit, $pos + 1)); foreach ($target as $t) - if (!empty($t) && !isset($checked_flowbits[$t])) + if (!empty($t) && !isset($checked_flowbits[$t])) { + if (!is_array($checked_flowbits[$t])) + $checked_flowbits[$t] = array(); $checked_flowbits[$t] = $action; + } } } } @@ -1544,8 +1465,11 @@ function snort_get_set_flowbits($rules_map) { if ($action == "set" || $action == "toggle" || $action == "setx") { $target = preg_split('/[&|]/', substr($flowbit, $pos + 1)); foreach ($target as $t) - if (!empty($t) && !isset($set_flowbits[$t])) + if (!empty($t) && !isset($set_flowbits[$t])) { + if (!is_array($set_flowbits[$t])) + $set_flowbits[$t] = array(); $set_flowbits[$t] = $action; + } } } } @@ -1624,7 +1548,7 @@ function snort_resolve_flowbits($rules, $active_rules) { $snortdir = SNORTDIR; - /* Check $all_rules array to be sure it is filled. */ + /* Check $rules array to be sure it is filled. */ if (empty($rules)) { log_error(gettext("[Snort] WARNING: Flowbit resolution not done - no rules in {$snortdir}/rules/ ...")); return array(); @@ -1683,7 +1607,7 @@ function snort_write_flowbit_rules_file($flowbit_rules, $rule_file) { $fp = fopen($rule_file, "w"); if ($fp) { @fwrite($fp, "# These rules set flowbits checked by your other enabled rules. If the\n"); - @fwrite($fp, "# the dependent flowbits are not set, then some of your chosen rules may\n"); + @fwrite($fp, "# dependent flowbits are not set, then some of your chosen rules may\n"); @fwrite($fp, "# not fire. Enabling all rules that set these dependent flowbits ensures\n"); @fwrite($fp, "# your chosen rules fire as intended.\n#\n"); @fwrite($fp, "# If you wish to prevent alerts from any of these rules, add the GID:SID\n"); @@ -1831,8 +1755,11 @@ function snort_load_sid_mods($sids, $value) { return $result; $tmp = explode("||", $sids); foreach ($tmp as $v) { - if (preg_match('/\s\d+/', $v, $match)) + if (preg_match('/\s\d+/', $v, $match)) { + if (!is_array($result[trim($match[0])])) + $result[trim($match[0])] = array(); $result[trim($match[0])] = trim($match[0]); + } } unset($tmp); @@ -1889,12 +1816,12 @@ function snort_modify_sids(&$rule_map, $snortcfg) { function snort_create_rc() { - /*********************************************************/ - /* This function builds the /usr/local/etc/rc.d/snort.sh */ - /* shell script for starting and stopping Snort. The */ - /* script is rebuilt on each package sync operation and */ - /* after any changes to snort.conf saved in the GUI. */ - /*********************************************************/ +/*********************************************************/ +/* This function builds the /usr/local/etc/rc.d/snort.sh */ +/* shell script for starting and stopping Snort. The */ +/* script is rebuilt on each package sync operation and */ +/* after any changes to snort.conf saved in the GUI. */ +/*********************************************************/ global $config, $g; @@ -1927,7 +1854,7 @@ function snort_create_rc() { fi if [ ! -z \$pid ]; then /usr/bin/logger -p daemon.info -i -t SnortStartup "Barnyard2 STOP for {$value['descr']}({$snort_uuid}_{$if_real})..." - /bin/pkill $pid -a + /bin/pkill \$pid -a time=0 timeout=30 while kill -0 \$pid 2>/dev/null; do sleep 1 @@ -2177,19 +2104,23 @@ function snort_deinstall() { /* Log a message only if a running process is detected */ if (is_service_running("snort")) log_error(gettext("[Snort] Snort STOP for all interfaces...")); - mwexec('/usr/bin/killall snort', true); + mwexec('/usr/bin/killall -z snort', true); sleep(2); mwexec('/usr/bin/killall -9 snort', true); sleep(2); + // Delete any leftover snort PID files in /var/run + array_map('@unlink', glob("/var/run/snort_*.pid")); /* Make sure all active Barnyard2 processes are terminated */ /* Log a message only if a running process is detected */ if (is_service_running("barnyard2")) log_error(gettext("[Snort] Barnyard2 STOP for all interfaces...")); - mwexec('/usr/bin/killall barnyard2', true); + mwexec('/usr/bin/killall -z barnyard2', true); sleep(2); mwexec('/usr/bin/killall -9 barnyard2', true); sleep(2); + // Delete any leftover barnyard2 PID files in /var/run + array_map('@unlink', glob("/var/run/barnyard2_*.pid")); /* Remove the snort user and group */ mwexec('/usr/sbin/pw userdel snort; /usr/sbin/pw groupdel snort', true); @@ -2241,6 +2172,7 @@ function snort_deinstall() { mwexec("/bin/rm -rf /usr/local/pkg/snort"); mwexec("/bin/rm -rf /usr/local/www/snort"); mwexec("/bin/rm -rf /usr/local/etc/snort"); + mwexec("/bin/rm -rf /usr/local/lib/snort"); } /* Keep this as a last step */ @@ -2602,6 +2534,8 @@ function snort_generate_conf($snortcfg) { /* user added arguments */ $snort_config_pass_thru = str_replace("\r", "", base64_decode($snortcfg['configpassthru'])); + // Remove the trailing newline + $snort_config_pass_thru = rtrim($snort_config_pass_thru); /* create a few directories and ensure the sample files are in place */ $snort_dirs = array( $snortdir, $snortcfgdir, "{$snortcfgdir}/rules", @@ -2625,7 +2559,7 @@ function snort_generate_conf($snortcfg) { /* update has been done and we should leave the customized files */ /* put in place by the rules update process. */ /********************************************************************/ - $snort_files = array("gen-msg.map", "classification.config", "reference.config", + $snort_files = array("gen-msg.map", "classification.config", "reference.config", "attribute_table.dtd", "sid-msg.map", "unicode.map", "threshold.conf", "preproc_rules/preprocessor.rules", "preproc_rules/decoder.rules", "preproc_rules/sensitive-data.rules" ); @@ -2678,14 +2612,15 @@ function snort_generate_conf($snortcfg) { $ssh_port = $config['system']['ssh']['port']; else $ssh_port = "22"; + + /* Define an array of default values for the various preprocessor ports */ $snort_ports = array( - "dns_ports" => "53", "smtp_ports" => "25", "mail_ports" => "25,143,465,691", - "http_ports" => "36,80,81,82,83,84,85,86,87,88,89,90,311,383,591,593,631,901,1220,1414,1741,1830,2301,2381,2809,3037,3057,3128,3443,3702,4343,4848,5250,6080,6988,7000,7001,7144,7145,7510,7777,7779,8000,8008,8014,8028,8080,8085,8088,8090,8118,8123,8180,8181,8222,8243,8280,8300,8500,8800,8888,8899,9000,9060,9080,9090,9091,9443,9999,10000,11371,34443,34444,41080,50000,50002,55555", - "oracle_ports" => "1024:", "mssql_ports" => "1433", - "telnet_ports" => "23","snmp_ports" => "161", "ftp_ports" => "21,2100,3535", - "ssh_ports" => $ssh_port, "pop2_ports" => "109", "pop3_ports" => "110", - "imap_ports" => "143", "sip_proxy_ports" => "5060:5090,16384:32768", - "sip_ports" => "5060,5061, 5600", "auth_ports" => "113", "finger_ports" => "79", + "dns_ports" => "53", "smtp_ports" => "25", "mail_ports" => "25,465,587,691", + "http_ports" => "36,80,81,82,83,84,85,86,87,88,89,90,311,383,591,593,631,901,1220,1414,1533,1741,1830,2301,2381,2809,3037,3057,3128,3443,3702,4343,4848,5250,6080,6988,7000,7001,7144,7145,7510,7777,7779,8000,8008,8014,8028,8080,8081,8082,8085,8088,8090,8118,8123,8180,8181,8222,8243,8280,8300,8500,8800,8888,8899,9000,9060,9080,9090,9091,9443,9999,10000,11371,15489,29991,33300,34412,34443,34444,41080,44440,50000,50002,51423,55555,56712", + "oracle_ports" => "1024:", "mssql_ports" => "1433", "telnet_ports" => "23", + "snmp_ports" => "161", "ftp_ports" => "21,2100,3535", "ssh_ports" => $ssh_port, + "pop2_ports" => "109", "pop3_ports" => "110", "imap_ports" => "143", + "sip_ports" => "5060,5061,5600", "auth_ports" => "113", "finger_ports" => "79", "irc_ports" => "6665,6666,6667,6668,6669,7000", "smb_ports" => "139,445", "nntp_ports" => "119", "rlogin_ports" => "513", "rsh_ports" => "514", "ssl_ports" => "443,465,563,636,989,992,993,994,995,7801,7802,7900,7901,7902,7903,7904,7905,7906,7907,7908,7909,7910,7911,7912,7913,7914,7915,7916,7917,7918,7919,7920", @@ -2698,14 +2633,32 @@ function snort_generate_conf($snortcfg) { "GTP_PORTS" => "2123,2152,3386" ); + /* Check for defined Aliases that may override default port settings as we build the portvars array */ $portvardef = ""; foreach ($snort_ports as $alias => $avalue) { if (!empty($snortcfg["def_{$alias}"]) && is_alias($snortcfg["def_{$alias}"])) - $snort_ports[$alias] = snort_get_alias_value($snortcfg["def_{$alias}"]); + $snort_ports[$alias] = trim(filter_expand_alias($snortcfg["def_{$alias}"])); $snort_ports[$alias] = preg_replace('/\s+/', ',', trim($snort_ports[$alias])); $portvardef .= "portvar " . strtoupper($alias) . " [" . $snort_ports[$alias] . "]\n"; } + /* Define the default ports for the Stream5 preprocessor (formatted for easier reading in the snort.conf file) */ + $stream5_ports_client = "21 22 23 25 42 53 70 79 109 110 111 113 119 135 136 137 \\\n"; + $stream5_ports_client .= "\t 139 143 161 445 513 514 587 593 691 1433 1521 1741 \\\n"; + $stream5_ports_client .= "\t 2100 3306 6070 6665 6666 6667 6668 6669 7000 8181 \\\n"; + $stream5_ports_client .= "\t 32770 32771 32772 32773 32774 32775 32776 32777 \\\n"; + $stream5_ports_client .= "\t 32778 32779"; + $stream5_ports_both = "80 81 82 83 84 85 86 87 88 89 90 110 311 383 443 465 563 \\\n"; + $stream5_ports_both .= "\t 591 593 631 636 901 989 992 993 994 995 1220 1414 1533 \\\n"; + $stream5_ports_both .= "\t 1830 2301 2381 2809 3037 3057 3128 3443 3702 4343 4848 \\\n"; + $stream5_ports_both .= "\t 5250 6080 6988 7907 7000 7001 7144 7145 7510 7802 7777 \\\n"; + $stream5_ports_both .= "\t 7779 7801 7900 7901 7902 7903 7904 7905 7906 7908 7909 \\\n"; + $stream5_ports_both .= "\t 7910 7911 7912 7913 7914 7915 7916 7917 7918 7919 7920 \\\n"; + $stream5_ports_both .= "\t 8000 8008 8014 8028 8080 8081 8082 8085 8088 8090 8118 \\\n"; + $stream5_ports_both .= "\t 8123 8180 8222 8243 8280 8300 8500 8800 8888 8899 9000 \\\n"; + $stream5_ports_both .= "\t 9060 9080 9090 9091 9443 9999 10000 11371 15489 29991 \\\n"; + $stream5_ports_both .= "\t 33300 34412 34443 34444 41080 44440 50000 50002 51423 \\\n"; + $stream5_ports_both .= "\t 55555 56712"; ///////////////////////////// /* preprocessor code */ @@ -2716,166 +2669,288 @@ preprocessor perfmonitor: time 300 file {$snortlogdir}/snort_{$if_real}{$snort_u EOD; - /* Pull in the user-configurable HTTP_INSPECT global preprocessor options */ - $http_inspect_memcap = "150994944"; - if (!empty($snortcfg['http_inspect_memcap'])) - $http_inspect_memcap = $snortcfg['http_inspect_memcap']; - - /* Pull in the user-configurable HTTP_INSPECT server preprocessor options */ - $server_flow_depth = '300'; - if ((!empty($snortcfg['server_flow_depth'])) || ($snortcfg['server_flow_depth'] == '0')) - $server_flow_depth = $snortcfg['server_flow_depth']; - $http_server_profile = "all"; - if (!empty($snortcfg['http_server_profile'])) - $http_server_profile = $snortcfg['http_server_profile']; - $client_flow_depth = '300'; - if ((!empty($snortcfg['client_flow_depth'])) || ($snortcfg['client_flow_depth'] == '0')) - $client_flow_depth = $snortcfg['client_flow_depth']; - if ($snortcfg['noalert_http_inspect'] == 'on' || empty($snortcfg['noalert_http_inspect'])) - $noalert_http_inspect = "no_alerts"; + /* def ftp_preprocessor */ + $telnet_ports = str_replace(",", " ", snort_expand_port_range($snort_ports['telnet_ports'])); + $ftp_ports = str_replace(",", " ", snort_expand_port_range($snort_ports['ftp_ports'])); + + // Configure FTP_Telnet global options + $ftp_telnet_globals = "inspection_type "; + if ($snortcfg['ftp_telnet_inspection_type'] != "") { $ftp_telnet_globals .= $snortcfg['ftp_telnet_inspection_type']; }else{ $ftp_telnet_globals .= "stateful"; } + if ($snortcfg['ftp_telnet_alert_encrypted'] == "on") + $ftp_telnet_globals .= " \\\n\tencrypted_traffic yes"; else - $noalert_http_inspect = ""; - $http_inspect_server_opts = "enable_cookie \\\n\textended_response_inspection \\\n\tnormalize_javascript \\\n"; - $http_inspect_server_opts .= "\tinspect_gzip \\\n\tnormalize_utf \\\n\tunlimited_decompress \\\n"; - $http_inspect_server_opts .= "\tnormalize_headers \\\n\tnormalize_cookies"; - if ($snortcfg['http_inspect_enable_xff'] == "on") - $http_inspect_server_opts .= " \\\n\tenable_xff"; - - /* If Stream5 is enabled, then we can enable the "log_uri" and "log_hostname" options */ - if ($snortcfg['stream5_reassembly'] == "on") { - if ($snortcfg['http_inspect_log_uri'] == "on") - $http_inspect_server_opts .= " \\\n\tlog_uri"; - if ($snortcfg['http_inspect_log_hostname'] == "on") - $http_inspect_server_opts .= " \\\n\tlog_hostname"; - } + $ftp_telnet_globals .= " \\\n\tencrypted_traffic no"; + if ($snortcfg['ftp_telnet_check_encrypted'] == "on") + $ftp_telnet_globals .= " \\\n\tcheck_encrypted"; + + // Configure FTP_Telnet Telnet protocol options + $ftp_telnet_protocol = "ports { {$telnet_ports} }"; + if ($snortcfg['ftp_telnet_normalize'] == "on") + $ftp_telnet_protocol .= " \\\n\tnormalize"; + if ($snortcfg['ftp_telnet_detect_anomalies'] == "on") + $ftp_telnet_protocol .= " \\\n\tdetect_anomalies"; + if ($snortcfg['ftp_telnet_ayt_attack_threshold'] <> '0') { + $ftp_telnet_protocol .= " \\\n\tayt_attack_thresh "; + if ($snortcfg['ftp_telnet_ayt_attack_threshold'] != "") + $ftp_telnet_protocol .= $snortcfg['ftp_telnet_ayt_attack_threshold']; + else + $ftp_telnet_protocol .= "20"; + } + + // Setup the standard FTP commands used for all FTP Server engines + $ftp_cmds = <<<EOD + ftp_cmds { ABOR ACCT ADAT ALLO APPE AUTH CCC CDUP } \ + ftp_cmds { CEL CLNT CMD CONF CWD DELE ENC EPRT } \ + ftp_cmds { EPSV ESTA ESTP FEAT HELP LANG LIST LPRT } \ + ftp_cmds { LPSV MACB MAIL MDTM MFMT MIC MKD MLSD MLST } \ + ftp_cmds { MODE NLST NOOP OPTS PASS PASV PBSZ PORT } \ + ftp_cmds { PROT PWD QUIT REIN REST RETR RMD RNFR } \ + ftp_cmds { RNTO SDUP SITE SIZE SMNT STAT STOR STOU } \ + ftp_cmds { STRU SYST TEST TYPE USER XCUP XCRC XCWD } \ + ftp_cmds { XMAS XMD5 XMKD XPWD XRCP XRMD XRSQ XSEM } \ + ftp_cmds { XSEN XSHA1 XSHA256 } \ + alt_max_param_len 0 { ABOR CCC CDUP ESTA FEAT LPSV NOOP PASV PWD QUIT REIN STOU SYST XCUP XPWD } \ + alt_max_param_len 200 { ALLO APPE CMD HELP NLST RETR RNFR STOR STOU XMKD } \ + alt_max_param_len 256 { CWD RNTO } \ + alt_max_param_len 400 { PORT } \ + alt_max_param_len 512 { MFMT SIZE } \ + chk_str_fmt { ACCT ADAT ALLO APPE AUTH CEL CLNT CMD } \ + chk_str_fmt { CONF CWD DELE ENC EPRT EPSV ESTP HELP } \ + chk_str_fmt { LANG LIST LPRT MACB MAIL MDTM MIC MKD } \ + chk_str_fmt { MLSD MLST MODE NLST OPTS PASS PBSZ PORT } \ + chk_str_fmt { PROT REST RETR RMD RNFR RNTO SDUP SITE } \ + chk_str_fmt { SIZE SMNT STAT STOR STRU TEST TYPE USER } \ + chk_str_fmt { XCRC XCWD XMAS XMD5 XMKD XRCP XRMD XRSQ } \ + chk_str_fmt { XSEM XSEN XSHA1 XSHA256 } \ + cmd_validity ALLO < int [ char R int ] > \ + cmd_validity EPSV < [ { char 12 | char A char L char L } ] > \ + cmd_validity MACB < string > \ + cmd_validity MDTM < [ date nnnnnnnnnnnnnn[.n[n[n]]] ] string > \ + cmd_validity MODE < char ASBCZ > \ + cmd_validity PORT < host_port > \ + cmd_validity PROT < char CSEP > \ + cmd_validity STRU < char FRPO [ string ] > \ + cmd_validity TYPE < { char AE [ char NTC ] | char I | char L [ number ] } > - $http_ports = str_replace(",", " ", $snort_ports['http_ports']); +EOD; - /* def http_inspect */ - $http_inspect = <<<EOD -# HTTP Inspect # -preprocessor http_inspect: global iis_unicode_map unicode.map 1252 compress_depth 65535 decompress_depth 65535 memcap {$http_inspect_memcap} + // Configure all the FTP_Telnet FTP protocol options + // Iterate and configure the FTP Client engines + $ftp_default_client_engine = array( "name" => "default", "bind_to" => "all", "max_resp_len" => 256, + "telnet_cmds" => "no", "ignore_telnet_erase_cmds" => "yes", + "bounce" => "yes", "bounce_to_net" => "", "bounce_to_port" => "" ); + + if (!is_array($snortcfg['ftp_client_engine']['item'])) + $snortcfg['ftp_client_engine']['item'] = array(); + + // If no FTP client engine is configured, use the default + // to keep from breaking Snort. + if (empty($snortcfg['ftp_client_engine']['item'])) + $snortcfg['ftp_client_engine']['item'][] = $ftp_default_client_engine; + $ftp_client_engine = ""; + + foreach ($snortcfg['ftp_client_engine']['item'] as $f => $v) { + $buffer = "preprocessor ftp_telnet_protocol: ftp client "; + if ($v['name'] == "default" && $v['bind_to'] == "all") + $buffer .= "default \\\n"; + elseif (is_alias($v['bind_to'])) { + $tmp = trim(filter_expand_alias($v['bind_to'])); + if (!empty($tmp)) { + $tmp = preg_replace('/\s+/', ' ', $tmp); + $buffer .= "{$tmp} \\\n"; + } + else { + log_error("[snort] ERROR: unable to resolve IP Address Alias '{$v['bind_to']}' for FTP client '{$v['name']}' ... skipping entry."); + continue; + } + } + else { + log_error("[snort] ERROR: unable to resolve IP Address Alias '{$v['bind_to']}' for FTP client '{$v['name']}' ... skipping entry."); + continue; + } + + if ($v['max_resp_len'] == "") + $buffer .= "\tmax_resp_len 256 \\\n"; + else + $buffer .= "\tmax_resp_len {$v['max_resp_len']} \\\n"; + + $buffer .= "\ttelnet_cmds {$v['telnet_cmds']} \\\n"; + $buffer .= "\tignore_telnet_erase_cmds {$v['ignore_telnet_erase_cmds']} \\\n"; + + if ($v['bounce'] == "yes") { + if (is_alias($v['bounce_to_net']) && is_alias($v['bounce_to_port'])) { + $net = trim(filter_expand_alias($v['bounce_to_net'])); + $port = trim(filter_expand_alias($v['bounce_to_port'])); + if (!empty($net) && !empty($port) && + snort_is_single_addr_alias($v['bounce_to_net']) && + (is_port($port) || is_portrange($port))) { + $port = preg_replace('/\s+/', ',', $port); + // Change port range delimiter to comma for ftp_telnet client preprocessor + if (is_portrange($port)) + $port = str_replace(":", ",", $port); + $buffer .= "\tbounce yes \\\n"; + $buffer .= "\tbounce_to { {$net},{$port} }\n"; + } + else { + // One or both of the BOUNCE_TO alias values is not right, + // so figure out which and log an appropriate error. + if (empty($net) || !snort_is_single_addr_alias($v['bounce_to_net'])) + log_error("[snort] ERROR: illegal value for bounce_to Address Alias [{$v['bounce_to_net']}] for FTP client engine [{$v['name']}] ... omitting 'bounce_to' option for this client engine."); + if (empty($port) || !(is_port($port) || is_portrange($port))) + log_error("[snort] ERROR: illegal value for bounce_to Port Alias [{$v['bounce_to_port']}] for FTP client engine [{$v['name']}] ... omitting 'bounce_to' option for this client engine."); + $buffer .= "\tbounce yes\n"; + } + } + else + $buffer .= "\tbounce yes\n"; + } + else + $buffer .= "\tbounce no\n"; + + // Add this FTP client engine to the master string + $ftp_client_engine .= "{$buffer}\n"; + } + // Trim final trailing newline + rtrim($ftp_client_engine); + + // Iterate and configure the FTP Server engines + $ftp_default_server_engine = array( "name" => "default", "bind_to" => "all", "ports" => "default", + "telnet_cmds" => "no", "ignore_telnet_erase_cmds" => "yes", + "ignore_data_chan" => "no", "def_max_param_len" => 100 ); + + if (!is_array($snortcfg['ftp_server_engine']['item'])) + $snortcfg['ftp_server_engine']['item'] = array(); + + // If no FTP server engine is configured, use the default + // to keep from breaking Snort. + if (empty($snortcfg['ftp_server_engine']['item'])) + $snortcfg['ftp_server_engine']['item'][] = $ftp_default_server_engine; + $ftp_server_engine = ""; + + foreach ($snortcfg['ftp_server_engine']['item'] as $f => $v) { + $buffer = "preprocessor ftp_telnet_protocol: ftp server "; + if ($v['name'] == "default" && $v['bind_to'] == "all") + $buffer .= "default \\\n"; + elseif (is_alias($v['bind_to'])) { + $tmp = trim(filter_expand_alias($v['bind_to'])); + if (!empty($tmp)) { + $tmp = preg_replace('/\s+/', ' ', $tmp); + $buffer .= "{$tmp} \\\n"; + } + else { + log_error("[snort] ERROR: unable to resolve IP Address Alias '{$v['bind_to']}' for FTP server '{$v['name']}' ... skipping entry."); + continue; + } + } + else { + log_error("[snort] ERROR: unable to resolve IP Address Alias '{$v['bind_to']}' for FTP server '{$v['name']}' ... skipping entry."); + continue; + } -preprocessor http_inspect_server: server default profile {$http_server_profile} {$noalert_http_inspect} \ - ports { {$http_ports} } \ - http_methods { GET POST PUT SEARCH MKCOL COPY MOVE LOCK UNLOCK NOTIFY POLL BCOPY BDELETE BMOVE LINK UNLINK OPTIONS HEAD DELETE TRACE TRACK CONNECT SOURCE SUBSCRIBE UNSUBSCRIBE PROPFIND PROPPATCH BPROPFIND BPROPPATCH RPC_CONNECT PROXY_SUCCESS BITS_POST CCM_POST SMS_POST RPC_IN_DATA RPC_OUT_DATA RPC_ECHO_DATA } \ - server_flow_depth {$server_flow_depth} \ - client_flow_depth {$client_flow_depth} \ - {$http_inspect_server_opts} + if ($v['def_max_param_len'] == "") + $buffer .= "\tdef_max_param_len 100 \\\n"; + elseif ($v['def_max_param_len'] <> '0') + $buffer .= "\tdef_max_param_len {$v['def_max_param_len']} \\\n"; + + if ($v['ports'] == "default" || !is_alias($v['ports']) || empty($v['ports'])) + $buffer .= "\tports { {$ftp_ports} } \\\n"; + elseif (is_alias($v['ports'])) { + $tmp = trim(filter_expand_alias($v['ports'])); + if (!empty($tmp)) { + $tmp = preg_replace('/\s+/', ' ', $tmp); + $tmp = snort_expand_port_range($tmp, ' '); + $buffer .= "\tports { {$tmp} } \\\n"; + } + else { + log_error("[snort] ERROR: unable to resolve Port Alias '{$v['ports']}' for FTP server '{$v['name']}' ... reverting to defaults."); + $buffer .= "\tports { {$ftp_ports} } \\\n"; + } + } -EOD; + $buffer .= "\ttelnet_cmds {$v['telnet_cmds']} \\\n"; + $buffer .= "\tignore_telnet_erase_cmds {$v['ignore_telnet_erase_cmds']} \\\n"; + if ($v['ignore_data_chan'] == "yes") + $buffer .= "\tignore_data_chan yes \\\n"; + $buffer .= "{$ftp_cmds}\n"; + + // Add this FTP server engine to the master string + $ftp_server_engine .= $buffer; + } + // Remove trailing newlines + rtrim($ftp_server_engine); - /* def ftp_preprocessor */ - $telnet_ports = str_replace(",", " ", $snort_ports['telnet_ports']); - $ftp_ports = str_replace(",", " ", $snort_ports['ftp_ports']); $ftp_preprocessor = <<<EOD # ftp_telnet preprocessor # preprocessor ftp_telnet: global \ -inspection_type stateless + {$ftp_telnet_globals} preprocessor ftp_telnet_protocol: telnet \ - normalize ports { {$telnet_ports} } \ - ayt_attack_thresh 20 \ - detect_anomalies - -preprocessor ftp_telnet_protocol: ftp server default \ - def_max_param_len 100 \ - ports { $ftp_ports } \ - telnet_cmds yes \ - ignore_telnet_erase_cmds yes \ - ftp_cmds { USER PASS ACCT CWD SDUP SMNT QUIT REIN PORT PASV TYPE STRU MODE } \ - ftp_cmds { RETR STOR STOU APPE ALLO REST RNFR RNTO ABOR DELE RMD MKD PWD } \ - ftp_cmds { LIST NLST SITE SYST STAT HELP NOOP } \ - ftp_cmds { AUTH ADAT PROT PBSZ CONF ENC } \ - ftp_cmds { FEAT CEL CMD MACB } \ - ftp_cmds { MDTM REST SIZE MLST MLSD } \ - ftp_cmds { XPWD XCWD XCUP XMKD XRMD TEST CLNT } \ - alt_max_param_len 0 { CDUP QUIT REIN PASV STOU ABOR PWD SYST NOOP } \ - alt_max_param_len 100 { MDTM CEL XCWD SITE USER PASS REST DELE RMD SYST TEST STAT MACB EPSV CLNT LPRT } \ - alt_max_param_len 200 { XMKD NLST ALLO STOU APPE RETR STOR CMD RNFR HELP } \ - alt_max_param_len 256 { RNTO CWD } \ - alt_max_param_len 400 { PORT } \ - alt_max_param_len 512 { SIZE } \ - chk_str_fmt { USER PASS ACCT CWD SDUP SMNT PORT TYPE STRU MODE } \ - chk_str_fmt { RETR STOR STOU APPE ALLO REST RNFR RNTO DELE RMD MKD } \ - chk_str_fmt { LIST NLST SITE SYST STAT HELP } \ - chk_str_fmt { AUTH ADAT PROT PBSZ CONF ENC } \ - chk_str_fmt { FEAT CEL CMD } \ - chk_str_fmt { MDTM REST SIZE MLST MLSD } \ - chk_str_fmt { XPWD XCWD XCUP XMKD XRMD TEST CLNT } \ - cmd_validity MODE < char ASBCZ > \ - cmd_validity STRU < char FRP > \ - cmd_validity ALLO < int [ char R int ] > \ - cmd_validity TYPE < { char AE [ char NTC ] | char I | char L [ number ] } > \ - cmd_validity MDTM < [ date nnnnnnnnnnnnnn[.n[n[n]]] ] string > \ - cmd_validity PORT < host_port > - -preprocessor ftp_telnet_protocol: ftp client default \ - max_resp_len 256 \ - bounce yes \ - ignore_telnet_erase_cmds yes \ - telnet_cmds yes - + {$ftp_telnet_protocol} + +{$ftp_server_engine} +{$ftp_client_engine} EOD; - $pop_ports = str_replace(",", " ", $snort_ports['pop3_ports']); + $pop_ports = str_replace(",", " ", snort_expand_port_range($snort_ports['pop3_ports'])); $pop_preproc = <<<EOD # POP preprocessor # preprocessor pop: \ ports { {$pop_ports} } \ - memcap 1310700 \ + memcap 1310700 \ qp_decode_depth 0 \ b64_decode_depth 0 \ bitenc_decode_depth 0 EOD; - $imap_ports = str_replace(",", " ", $snort_ports['imap_ports']); + $imap_ports = str_replace(",", " ", snort_expand_port_range($snort_ports['imap_ports'])); $imap_preproc = <<<EOD # IMAP preprocessor # preprocessor imap: \ ports { {$imap_ports} } \ - memcap 1310700 \ + memcap 1310700 \ qp_decode_depth 0 \ b64_decode_depth 0 \ bitenc_decode_depth 0 EOD; - $smtp_ports = str_replace(",", " ", $snort_ports['mail_ports']); + $smtp_ports = str_replace(",", " ", snort_expand_port_range($snort_ports['mail_ports'])); /* def smtp_preprocessor */ $smtp_preprocessor = <<<EOD # SMTP preprocessor # preprocessor SMTP: \ - ports { {$smtp_ports} } \ - inspection_type stateful \ - normalize cmds \ - ignore_tls_data \ - valid_cmds { MAIL RCPT HELP HELO ETRN EHLO EXPN VRFY ATRN SIZE BDAT DEBUG EMAL ESAM ESND ESOM EVFY IDENT NOOP RSET \ - SEND SAML SOML AUTH TURN ETRN PIPELINING CHUNKING DATA DSN RSET QUIT ONEX QUEU STARTTLS TICK TIME \ - TURNME VERB X-EXPS X-LINK2STATE XADR XAUTH XCIR XEXCH50 XGEN XLICENSE XQUEU XSTA XTRN XUSR } \ - normalize_cmds { MAIL RCPT HELP HELO ETRN EHLO EXPN VRFY ATRN SIZE BDAT DEBUG EMAL ESAM ESND ESOM EVFY IDENT NOOP \ - RSET SEND SAML SOML AUTH TURN ETRN PIPELINING CHUNKING DATA DSN RSET QUIT ONEX QUEU STARTTLS TICK \ - TIME TURNME VERB X-EXPS X-LINK2STATE XADR XAUTH XCIR XEXCH50 XGEN XLICENSE XQUEU XSTA XTRN XUSR } \ - max_header_line_len 1000 \ - max_response_line_len 512 \ - alt_max_command_line_len 260 { MAIL } \ - alt_max_command_line_len 300 { RCPT } \ - alt_max_command_line_len 500 { HELP HELO ETRN EHLO } \ - alt_max_command_line_len 255 { EXPN VRFY ATRN SIZE BDAT DEBUG EMAL ESAM ESND ESOM EVFY IDENT NOOP RSET } \ - alt_max_command_line_len 246 { SEND SAML SOML AUTH TURN ETRN PIPELINING CHUNKING DATA DSN RSET QUIT ONEX } \ - alt_max_command_line_len 246 { QUEU STARTTLS TICK TIME TURNME VERB X-EXPS X-LINK2STATE XADR } \ - alt_max_command_line_len 246 { XAUTH XCIR XEXCH50 XGEN XLICENSE XQUEU XSTA XTRN XUSR } \ - xlink2state { enable } \ - log_mailfrom \ - log_rcptto \ - log_email_hdrs \ - email_hdrs_log_depth 1464 \ - log_filename \ - qp_decode_depth 0 \ - b64_decode_depth 0 \ - bitenc_decode_depth 0 \ - uu_decode_depth 0 + ports { {$smtp_ports} } \ + inspection_type stateful \ + normalize cmds \ + ignore_tls_data \ + valid_cmds { MAIL RCPT HELP HELO ETRN EHLO EXPN VRFY ATRN SIZE BDAT DEBUG EMAL ESAM ESND ESOM EVFY IDENT \ + NOOP RSET SEND SAML SOML AUTH TURN ETRN PIPELINING CHUNKING DATA DSN RSET QUIT ONEX QUEU \ + STARTTLS TICK TIME TURNME VERB X-EXPS X-LINK2STATE XADR XAUTH XCIR XEXCH50 XGEN XLICENSE \ + XQUEU XSTA XTRN XUSR } \ + normalize_cmds { MAIL RCPT HELP HELO ETRN EHLO EXPN VRFY ATRN SIZE BDAT DEBUG EMAL ESAM ESND ESOM EVFY \ + IDENT NOOP RSET SEND SAML SOML AUTH TURN ETRN PIPELINING CHUNKING DATA DSN RSET QUIT \ + ONEX QUEU STARTTLS TICK TIME TURNME VERB X-EXPS X-LINK2STATE XADR XAUTH XCIR XEXCH50 \ + XGEN XLICENSE XQUEU XSTA XTRN XUSR } \ + max_header_line_len 1000 \ + max_response_line_len 512 \ + alt_max_command_line_len 260 { MAIL } \ + alt_max_command_line_len 300 { RCPT } \ + alt_max_command_line_len 500 { HELP HELO ETRN EHLO } \ + alt_max_command_line_len 255 { EXPN VRFY ATRN SIZE BDAT DEBUG EMAL ESAM ESND ESOM EVFY IDENT NOOP RSET } \ + alt_max_command_line_len 246 { SEND SAML SOML AUTH TURN ETRN PIPELINING CHUNKING DATA DSN RSET QUIT ONEX } \ + alt_max_command_line_len 246 { QUEU STARTTLS TICK TIME TURNME VERB X-EXPS X-LINK2STATE XADR } \ + alt_max_command_line_len 246 { XAUTH XCIR XEXCH50 XGEN XLICENSE XQUEU XSTA XTRN XUSR } \ + xlink2state { enable } \ + log_mailfrom \ + log_rcptto \ + log_email_hdrs \ + email_hdrs_log_depth 1464 \ + log_filename \ + qp_decode_depth 0 \ + b64_decode_depth 0 \ + bitenc_decode_depth 0 \ + uu_decode_depth 0 EOD; @@ -2894,25 +2969,27 @@ EOD; $sf_pscan_sense_level = $snortcfg['pscan_sense_level']; $sf_pscan_ignore_scanners = "\$HOME_NET"; if (!empty($snortcfg['pscan_ignore_scanners']) && is_alias($snortcfg['pscan_ignore_scanners'])) { - $sf_pscan_ignore_scanners = snort_get_alias_value($snortcfg['pscan_ignore_scanners']); + $sf_pscan_ignore_scanners = trim(filter_expand_alias($snortcfg['pscan_ignore_scanners'])); $sf_pscan_ignore_scanners = preg_replace('/\s+/', ',', trim($sf_pscan_ignore_scanners)); } $sf_portscan = <<<EOD -# sf Portscan preprocessor # -preprocessor sfportscan: scan_type { {$sf_pscan_type} } \ - proto { {$sf_pscan_protocol} } \ - memcap { {$sf_pscan_memcap} } \ - sense_level { {$sf_pscan_sense_level} } \ - ignore_scanners { {$sf_pscan_ignore_scanners} } +# sf Portscan # +preprocessor sfportscan: \ + scan_type { {$sf_pscan_type} } \ + proto { {$sf_pscan_protocol} } \ + memcap { {$sf_pscan_memcap} } \ + sense_level { {$sf_pscan_sense_level} } \ + ignore_scanners { {$sf_pscan_ignore_scanners} } EOD; /* def ssh_preproc */ - $ssh_ports = str_replace(",", " ", $snort_ports['ssh_ports']); + $ssh_ports = str_replace(",", " ", snort_expand_port_range($snort_ports['ssh_ports'])); $ssh_preproc = <<<EOD # SSH preprocessor # -preprocessor ssh: server_ports { {$ssh_ports} } \ +preprocessor ssh: \ + server_ports { {$ssh_ports} } \ autodetect \ max_client_bytes 19600 \ max_encrypted_packets 20 \ @@ -2923,10 +3000,14 @@ preprocessor ssh: server_ports { {$ssh_ports} } \ EOD; /* def other_preprocs */ - $sun_rpc_ports = str_replace(",", " ", $snort_ports['sun_rpc_ports']); + $sun_rpc_ports = str_replace(",", " ", snort_expand_port_range($snort_ports['sun_rpc_ports'])); $other_preprocs = <<<EOD # Other preprocs # -preprocessor rpc_decode: {$sun_rpc_ports} no_alert_multiple_requests no_alert_large_fragments no_alert_incomplete +preprocessor rpc_decode: \ + {$sun_rpc_ports} \ + no_alert_multiple_requests \ + no_alert_large_fragments \ + no_alert_incomplete # Back Orifice preprocessor # preprocessor bo @@ -2936,18 +3017,28 @@ EOD; /* def dce_rpc_2 */ $dce_rpc_2 = <<<EOD # DCE/RPC 2 # -preprocessor dcerpc2: memcap 102400, events [co] -preprocessor dcerpc2_server: default, policy WinXP, \ - detect [smb [{$snort_ports['smb_ports']}], tcp 135, udp 135, rpc-over-http-server 593], \ - autodetect [tcp 1025:, udp 1025:, rpc-over-http-server 1025:], \ - smb_max_chain 3, smb_invalid_shares ["C$", "D$", "ADMIN$"] +preprocessor dcerpc2: \ + memcap 102400, \ + events [co] + +preprocessor dcerpc2_server: default, \ + policy WinXP, \ + detect [smb [{$snort_ports['smb_ports']}], \ + tcp 135, \ + udp 135, \ + rpc-over-http-server 593], \ + autodetect [tcp 1025:, \ + udp 1025:, \ + rpc-over-http-server 1025:], \ + smb_max_chain 3, smb_invalid_shares ["C$", "D$", "ADMIN$"] EOD; - $sip_ports = str_replace(",", " ", $snort_ports['sip_ports']); + $sip_ports = str_replace(",", " ", snort_expand_port_range($snort_ports['sip_ports'])); $sip_preproc = <<<EOD # SIP preprocessor # -preprocessor sip: max_sessions 40000, \ +preprocessor sip: \ + max_sessions 40000, \ ports { {$sip_ports} }, \ methods { invite \ cancel \ @@ -2982,68 +3073,71 @@ preprocessor sip: max_sessions 40000, \ EOD; - $dns_ports = str_replace(",", " ", $snort_ports['dns_ports']); + $dns_ports = str_replace(",", " ", snort_expand_port_range($snort_ports['dns_ports'])); /* def dns_preprocessor */ $dns_preprocessor = <<<EOD # DNS preprocessor # preprocessor dns: \ - ports { {$dns_ports} } \ - enable_rdata_overflow + ports { {$dns_ports} } \ + enable_rdata_overflow EOD; /* def dnp3_preprocessor */ - $dnp3_ports = str_replace(",", " ", $snort_ports['DNP3_PORTS']); + $dnp3_ports = str_replace(",", " ", snort_expand_port_range($snort_ports['DNP3_PORTS'])); $dnp3_preproc = <<<EOD # DNP3 preprocessor # preprocessor dnp3: \ - ports { {$dnp3_ports} } \ - memcap 262144 \ - check_crc + ports { {$dnp3_ports} } \ + memcap 262144 \ + check_crc EOD; /* def modbus_preprocessor */ - $modbus_ports = str_replace(",", " ", $snort_ports['MODBUS_PORTS']); + $modbus_ports = str_replace(",", " ", snort_expand_port_range($snort_ports['MODBUS_PORTS'])); $modbus_preproc = <<<EOD # Modbus preprocessor # preprocessor modbus: \ - ports { {$modbus_ports} } + ports { {$modbus_ports} } EOD; /* def gtp_preprocessor */ - $gtp_ports = str_replace(",", " ", $snort_ports['GTP_PORTS']); + $gtp_ports = str_replace(",", " ", snort_expand_port_range($snort_ports['GTP_PORTS'])); $gtp_preproc = <<<EOD # GTP preprocessor # -preprocessor gtp: ports { {$gtp_ports} } +preprocessor gtp: \ + ports { {$gtp_ports} } EOD; /* def ssl_preprocessor */ - $ssl_ports = str_replace(",", " ", $snort_ports['ssl_ports']); + $ssl_ports = str_replace(",", " ", snort_expand_port_range($snort_ports['ssl_ports'])); $ssl_preproc = <<<EOD # SSL preprocessor # preprocessor ssl: \ ports { {$ssl_ports} }, \ - trustservers, noinspect_encrypted + trustservers, \ + noinspect_encrypted EOD; - $sensitive_data = "preprocessor sensitive_data:\n"; + /* def sensitive_data_preprocessor */ + if ($snortcfg['sdf_mask_output'] == "on") + $sdf_mask_output = "\\\n\tmask_output"; + else + $sdf_mask_output = ""; + if (empty($snortcfg['sdf_alert_threshold'])) + $snortcfg['sdf_alert_threshold'] = 25; + $sensitive_data = <<<EOD +# SDF preprocessor # +preprocessor sensitive_data: \ + alert_threshold {$snortcfg['sdf_alert_threshold']} {$sdf_mask_output} - /**************************************************************/ - /* Default the HTTP_INSPECT preprocessor to "on" if not set. */ - /* The preprocessor is required by hundreds of Snort rules, */ - /* and without it Snort may not start and/or the number of */ - /* rules required to be disabled reduces Snort's capability. */ - /* Alerts from the HTTP_INSPECT preprocessor default to "off" */ - /* unless a specific value has been set by the user. */ - /**************************************************************/ - if (empty($snortcfg['http_inspect'])) - $snortcfg['http_inspect'] = 'on'; +EOD; - /* define servers and ports snortdefservers */ + /* define servers as IP variables */ $snort_servers = array ( "dns_servers" => "\$HOME_NET", "smtp_servers" => "\$HOME_NET", "http_servers" => "\$HOME_NET", "www_servers" => "\$HOME_NET", "sql_servers" => "\$HOME_NET", "telnet_servers" => "\$HOME_NET", @@ -3055,13 +3149,15 @@ EOD; "aim_servers" => "64.12.24.0/23,64.12.28.0/23,64.12.161.0/24,64.12.163.0/24,64.12.200.0/24,205.188.3.0/24,205.188.5.0/24,205.188.7.0/24,205.188.9.0/24,205.188.153.0/24,205.188.179.0/24,205.188.248.0/24" ); - $vardef = ""; + // Change old name from "var" to new name of "ipvar" for IP variables because + // Snort is deprecating the old "var" name in newer versions. + $ipvardef = ""; foreach ($snort_servers as $alias => $avalue) { if (!empty($snortcfg["def_{$alias}"]) && is_alias($snortcfg["def_{$alias}"])) { - $avalue = snort_get_alias_value($snortcfg["def_{$alias}"]); - $avalue = str_replace(" ", ",", trim($avalue)); + $avalue = trim(filter_expand_alias($snortcfg["def_{$alias}"])); + $avalue = preg_replace('/\s+/', ',', trim($avalue)); } - $vardef .= "var " . strtoupper($alias) . " [{$avalue}]\n"; + $ipvardef .= "ipvar " . strtoupper($alias) . " [{$avalue}]\n"; } $snort_preproc_libs = array( @@ -3071,7 +3167,7 @@ EOD; "ssl_preproc" => "ssl_preproc", "dnp3_preproc" => "dnp3_preproc", "modbus_preproc" => "modbus_preproc" ); $snort_preproc = array ( - "perform_stat", "http_inspect", "other_preprocs", "ftp_preprocessor", "smtp_preprocessor", "ssl_preproc", "sip_preproc", "gtp_preproc", "ssh_preproc", + "perform_stat", "other_preprocs", "ftp_preprocessor", "smtp_preprocessor", "ssl_preproc", "sip_preproc", "gtp_preproc", "ssh_preproc", "sf_portscan", "dce_rpc_2", "dns_preprocessor", "sensitive_data", "pop_preproc", "imap_preproc", "dnp3_preproc", "modbus_preproc" ); $default_disabled_preprocs = array( @@ -3105,6 +3201,8 @@ EOD; } } } + // Remove final trailing newline + $snort_preprocessors = rtrim($snort_preprocessors); $snort_misc_include_rules = ""; if (file_exists("{$snortcfgdir}/reference.config")) @@ -3114,8 +3212,18 @@ EOD; if (is_dir("{$snortcfgdir}/preproc_rules")) { if ($snortcfg['sensitive_data'] == 'on' && $protect_preproc_rules == "off") { $sedcmd = '/^#alert.*classtype:sdf/s/^#//'; - if (file_exists("{$snortcfgdir}/preproc_rules/sensitive-data.rules")) + if (file_exists("{$snortcfgdir}/preproc_rules/sensitive-data.rules")){ $snort_misc_include_rules .= "include \$PREPROC_RULE_PATH/sensitive-data.rules\n"; + #enable only selected sensitive data + if (file_exists(SNORTDIR."/preproc_rules/sensitive-data.rules")){ + $sdf_alert_pattern="(".preg_replace("/,/","|",$snortcfg['sdf_alert_data_type']).")"; + $sd_tmp_file=file(SNORTDIR."/preproc_rules/sensitive-data.rules"); + $sd_tmp_new_file=""; + foreach ($sd_tmp_file as $sd_tmp_line) + $sd_tmp_new_file.=preg_match("/$sdf_alert_pattern/i",$sd_tmp_line) ? $sd_tmp_line : ""; + file_put_contents("{$snortcfgdir}/preproc_rules/sensitive-data.rules",$sd_tmp_new_file,LOCK_EX); + } + } } else $sedcmd = '/^alert.*classtype:sdf/s/^/#/'; if (file_exists("{$snortcfgdir}/preproc_rules/decoder.rules") && @@ -3146,6 +3254,10 @@ EOD; $selected_rules_sections .= "include \$RULE_PATH/{$flowbit_rules_file}\n"; $selected_rules_sections .= "include \$RULE_PATH/custom.rules\n"; + // Remove trailing newlines + $snort_misc_include_rules = rtrim($snort_misc_include_rules); + $selected_rules_sections = rtrim($selected_rules_sections); + /* Create the actual rules files and save in the interface directory */ snort_prepare_rule_files($snortcfg, $snortcfgdir); @@ -3163,83 +3275,247 @@ EOD; $cfg_detect_settings .= " no_stream_inserts"; /* Pull in user-configurable options for Frag3 preprocessor settings */ - $frag3_disabled = ""; - if ($snortcfg['frag3_detection'] == "off") - $frag3_disabled = ", disabled"; - $frag3_memcap = "memcap 4194304"; + /* Get global Frag3 options first and put into a string */ + $frag3_global = "preprocessor frag3_global: "; if (!empty($snortcfg['frag3_memcap']) || $snortcfg['frag3_memcap'] == "0") - $frag3_memcap = "memcap {$snortcfg['frag3_memcap']}"; - $frag3_max_frags = "max_frags 8192"; + $frag3_global .= "memcap {$snortcfg['frag3_memcap']}, "; + else + $frag3_global .= "memcap 4194304, "; if (!empty($snortcfg['frag3_max_frags'])) - $frag3_max_frags = "max_frags {$snortcfg['frag3_max_frags']}"; - $frag3_overlap_limit = "overlap_limit 0"; - if (!empty($snortcfg['frag3_overlap_limit'])) - $frag3_overlap_limit = "overlap_limit {$snortcfg['frag3_overlap_limit']}"; - $frag3_min_frag_len = "min_fragment_length 0"; - if (!empty($snortcfg['frag3_min_frag_len'])) - $frag3_min_frag_len = "min_fragment_length {$snortcfg['frag3_min_frag_len']}"; - $frag3_timeout = "timeout 60"; - if (!empty($snortcfg['frag3_timeout'])) - $frag3_timeout = "timeout {$snortcfg['frag3_timeout']}"; - $frag3_policy = "policy bsd"; - if (!empty($snortcfg['frag3_policy'])) - $frag3_policy = "policy {$snortcfg['frag3_policy']}"; - - /* Grab any user-customized value for Protocol Aware Flushing (PAF) max PDUs */ + $frag3_global .= "max_frags {$snortcfg['frag3_max_frags']}"; + else + $frag3_global .= "max_frags 8192"; + if ($snortcfg['frag3_detection'] == "off") + $frag3_global .= ", disabled"; + + $frag3_default_tcp_engine = array( "name" => "default", "bind_to" => "all", "policy" => "bsd", + "timeout" => 60, "min_ttl" => 1, "detect_anomalies" => "on", + "overlap_limit" => 0, "min_frag_len" => 0 ); + $frag3_engine = ""; + + // Now iterate configured Frag3 engines and write them to a string if enabled + if ($snortcfg['frag3_detection'] == "on") { + if (!is_array($snortcfg['frag3_engine']['item'])) + $snortcfg['frag3_engine']['item'] = array(); + + // If no frag3 tcp engine is configured, use the default + if (empty($snortcfg['frag3_engine']['item'])) + $snortcfg['frag3_engine']['item'][] = $frag3_default_tcp_engine; + + foreach ($snortcfg['frag3_engine']['item'] as $f => $v) { + $frag3_engine .= "preprocessor frag3_engine: "; + $frag3_engine .= "policy {$v['policy']}"; + if ($v['bind_to'] <> "all") { + $tmp = trim(filter_expand_alias($v['bind_to'])); + if (!empty($tmp)) { + $tmp = preg_replace('/\s+/', ',', $tmp); + if (strpos($tmp, ",") !== false) + $frag3_engine .= " \\\n\tbind_to [{$tmp}]"; + else + $frag3_engine .= " \\\n\tbind_to {$tmp}"; + } + else + log_error("[snort] WARNING: unable to resolve IP List Alias '{$v['bind_to']}' for Frag3 engine '{$v['name']}' ... using 0.0.0.0 failsafe."); + } + $frag3_engine .= " \\\n\ttimeout {$v['timeout']}"; + $frag3_engine .= " \\\n\tmin_ttl {$v['min_ttl']}"; + if ($v['detect_anomalies'] == "on") { + $frag3_engine .= " \\\n\tdetect_anomalies"; + $frag3_engine .= " \\\n\toverlap_limit {$v['overlap_limit']}"; + $frag3_engine .= " \\\n\tmin_fragment_length {$v['min_frag_len']}"; + } + // Add newlines to terminate this engine + $frag3_engine .= "\n\n"; + } + // Remove trailing newline + $frag3_engine = rtrim($frag3_engine); + } + + // Grab any user-customized value for Protocol Aware Flushing (PAF) max PDUs $paf_max_pdu_config = "config paf_max: "; - if (empty($snortcfg['max_paf']) || $snortcfg['max_paf'] == "0") + if (empty($snortcfg['max_paf']) || $snortcfg['max_paf'] == '0') $paf_max_pdu_config .= "0"; else $paf_max_pdu_config .= $snortcfg['max_paf']; - /* Pull in user-configurable options for Stream5 preprocessor settings */ - $stream5_reassembly = ""; + // Pull in user-configurable options for Stream5 preprocessor settings + // Get global options first and put into a string + $stream5_global = "preprocessor stream5_global: \\\n"; if ($snortcfg['stream5_reassembly'] == "off") - $stream5_reassembly = "disabled,"; - $stream5_track_tcp = "yes"; - if ($snortcfg['stream5_track_tcp'] =="off") - $stream5_track_tcp = "no"; - $stream5_track_udp = "yes"; - if ($snortcfg['stream5_track_udp'] =="off") - $stream5_track_udp = "no"; - $stream5_track_icmp = "no"; - if ($snortcfg['stream5_track_icmp'] =="on") - $stream5_track_icmp = "yes"; - $stream5_require_3whs = ""; - if ($snortcfg['stream5_require_3whs'] == "on") - $stream5_require_3whs = ", require_3whs 0"; - $stream5_no_reassemble_async = ""; - if ($snortcfg['stream5_no_reassemble_async'] == "on") - $stream5_no_reassemble_async = ", dont_reassemble_async"; - $stream5_dont_store_lg_pkts = ""; - if ($snortcfg['stream5_dont_store_lg_pkts'] == "on") - $stream5_dont_store_lg_pkts = ", dont_store_large_packets"; - $stream5_max_queued_bytes_type = ""; - if ((!empty($snortcfg['max_queued_bytes'])) || ($snortcfg['max_queued_bytes'] == '0')) - $stream5_max_queued_bytes_type = ", max_queued_bytes {$snortcfg['max_queued_bytes']}"; - $stream5_max_queued_segs_type = ""; - if ((!empty($snortcfg['max_queued_segs'])) || ($snortcfg['max_queued_segs'] == '0')) - $stream5_max_queued_segs_type = ", max_queued_segs {$snortcfg['max_queued_segs']}"; - $stream5_mem_cap = ""; + $stream5_global .= "\tdisabled, \\\n"; + if ($snortcfg['stream5_track_tcp'] == "off") + $stream5_global .= "\ttrack_tcp no,"; + else { + $stream5_global .= "\ttrack_tcp yes,"; + if (!empty($snortcfg['stream5_max_tcp'])) + $stream5_global .= " \\\n\tmax_tcp {$snortcfg['stream5_max_tcp']},"; + else + $stream5_global .= " \\\n\tmax_tcp 262144,"; + } + if ($snortcfg['stream5_track_udp'] == "off") + $stream5_global .= " \\\n\ttrack_udp no,"; + else { + $stream5_global .= " \\\n\ttrack_udp yes,"; + if (!empty($snortcfg['stream5_max_udp'])) + $stream5_global .= " \\\n\tmax_udp {$snortcfg['stream5_max_udp']},"; + else + $stream5_global .= " \\\n\tmax_udp 131072,"; + } + if ($snortcfg['stream5_track_icmp'] == "on") { + $stream5_global .= " \\\n\ttrack_icmp yes,"; + if (!empty($snortcfg['stream5_max_icmp'])) + $stream5_global .= " \\\n\tmax_icmp {$snortcfg['stream5_max_icmp']},"; + else + $stream5_global .= " \\\n\tmax_icmp 65536,"; + } + else + $stream5_global .= " \\\n\ttrack_icmp no,"; if (!empty($snortcfg['stream5_mem_cap'])) - $stream5_mem_cap = ", memcap {$snortcfg['stream5_mem_cap']}"; - $stream5_overlap_limit = "overlap_limit 0"; - if (!empty($snortcfg['stream5_overlap_limit'])) - $stream5_overlap_limit = "overlap_limit {$snortcfg['stream5_overlap_limit']}"; - $stream5_policy = "policy bsd"; - if (!empty($snortcfg['stream5_policy'])) - $stream5_policy = "policy {$snortcfg['stream5_policy']}"; - $stream5_tcp_timeout = "timeout 30"; - if (!empty($snortcfg['stream5_tcp_timeout'])) - $stream5_tcp_timeout = "timeout {$snortcfg['stream5_tcp_timeout']}"; - $stream5_udp_timeout = "timeout 30"; - if (!empty($snortcfg['stream5_udp_timeout'])) - $stream5_udp_timeout = "timeout {$snortcfg['stream5_udp_timeout']}"; - $stream5_icmp_timeout = "timeout 30"; - if (!empty($snortcfg['stream5_icmp_timeout'])) - $stream5_icmp_timeout = "timeout {$snortcfg['stream5_icmp_timeout']}"; - - /* Check for and configure Host Attribute Table if enabled */ + $stream5_global .= " \\\n\tmemcap {$snortcfg['stream5_mem_cap']},"; + else + $stream5_global .= " \\\n\tmemcap 8388608,"; + + if (!empty($snortcfg['stream5_prune_log_max']) || $snortcfg['stream5_prune_log_max'] == '0') + $stream5_global .= " \\\n\tprune_log_max {$snortcfg['stream5_prune_log_max']}"; + else + $stream5_global .= " \\\n\tprune_log_max 1048576"; + if ($snortcfg['stream5_flush_on_alert'] == "on") + $stream5_global .= ", \\\n\tflush_on_alert"; + + $stream5_default_tcp_engine = array( "name" => "default", "bind_to" => "all", "policy" => "bsd", "timeout" => 30, + "max_queued_bytes" => 1048576, "detect_anomalies" => "off", "overlap_limit" => 0, + "max_queued_segs" => 2621, "require_3whs" => "off", "startup_3whs_timeout" => 0, + "no_reassemble_async" => "off", "dont_store_lg_pkts" => "off", "max_window" => 0, + "use_static_footprint_sizes" => "off", "check_session_hijacking" => "off", "ports_client" => "default", + "ports_both" => "default", "ports_server" => "none" ); + $stream5_tcp_engine = ""; + + // Now iterate configured Stream5 TCP engines and write them to a string if enabled + if ($snortcfg['stream5_reassembly'] == "on") { + if (!is_array($snortcfg['stream5_tcp_engine']['item'])) + $snortcfg['stream5_tcp_engine']['item'] = array(); + + // If no stream5 tcp engine is configured, use the default + if (empty($snortcfg['stream5_tcp_engine']['item'])) + $snortcfg['stream5_tcp_engine']['item'][] = $stream5_default_tcp_engine; + + foreach ($snortcfg['stream5_tcp_engine']['item'] as $f => $v) { + $buffer = "preprocessor stream5_tcp: "; + $buffer .= "policy {$v['policy']},"; + if ($v['bind_to'] <> "all") { + $tmp = trim(filter_expand_alias($v['bind_to'])); + if (!empty($tmp)) { + $tmp = preg_replace('/\s+/', ',', $tmp); + if (strpos($tmp, ",") !== false) + $buffer .= " \\\n\tbind_to [{$tmp}],"; + else + $buffer .= " \\\n\tbind_to {$tmp},"; + } + else { + log_error("[snort] WARNING: unable to resolve IP Address Alias [{$v['bind_to']}] for Stream5 TCP engine '{$v['name']}' ... skipping this engine."); + continue; + } + } + $stream5_tcp_engine .= $buffer; + $stream5_tcp_engine .= " \\\n\ttimeout {$v['timeout']},"; + $stream5_tcp_engine .= " \\\n\toverlap_limit {$v['overlap_limit']},"; + $stream5_tcp_engine .= " \\\n\tmax_window {$v['max_window']},"; + $stream5_tcp_engine .= " \\\n\tmax_queued_bytes {$v['max_queued_bytes']},"; + $stream5_tcp_engine .= " \\\n\tmax_queued_segs {$v['max_queued_segs']}"; + if ($v['use_static_footprint_sizes'] == "on") + $stream5_tcp_engine .= ", \\\n\tuse_static_footprint_sizes"; + if ($v['check_session_hijacking'] == "on") + $stream5_tcp_engine .= ", \\\n\tcheck_session_hijacking"; + if ($v['dont_store_lg_pkts'] == "on") + $stream5_tcp_engine .= ", \\\n\tdont_store_large_packets"; + if ($v['no_reassemble_async'] == "on") + $stream5_tcp_engine .= ", \\\n\tdont_reassemble_async"; + if ($v['detect_anomalies'] == "on") + $stream5_tcp_engine .= ", \\\n\tdetect_anomalies"; + if ($v['require_3whs'] == "on") + $stream5_tcp_engine .= ", \\\n\trequire_3whs {$v['startup_3whs_timeout']}"; + if (!empty($v['ports_client'])) { + $stream5_tcp_engine .= ", \\\n\tports client"; + if ($v['ports_client'] == " all") + $stream5_tcp_engine .= " all"; + elseif ($v['ports_client'] == "default") + $stream5_tcp_engine .= " {$stream5_ports_client}"; + else { + $tmp = trim(filter_expand_alias($v['ports_client'])); + if (!empty($tmp)) + $stream5_tcp_engine .= " " . trim(preg_replace('/\s+/', ' ', $tmp)); + else { + $stream5_tcp_engine .= " {$stream5_ports_client}"; + log_error("[snort] WARNING: unable to resolve Ports Client Alias [{$v['ports_client']}] for Stream5 TCP engine '{$v['name']}' ... using default value."); + } + } + } + if (!empty($v['ports_both'])) { + $stream5_tcp_engine .= ", \\\n\tports both"; + if ($v['ports_both'] == " all") + $stream5_tcp_engine .= " all"; + elseif ($v['ports_both'] == "default") + $stream5_tcp_engine .= " {$stream5_ports_both}"; + else { + $tmp = trim(filter_expand_alias($v['ports_both'])); + if (!empty($tmp)) + $stream5_tcp_engine .= " " . trim(preg_replace('/\s+/', ' ', $tmp)); + else { + $stream5_tcp_engine .= " {$stream5_ports_both}"; + log_error("[snort] WARNING: unable to resolve Ports Both Alias [{$v['ports_both']}] for Stream5 TCP engine '{$v['name']}' ... using default value."); + } + } + } + if (!empty($v['ports_server']) && $v['ports_server'] <> "none" && $v['ports_server'] <> "default") { + if ($v['ports_server'] == " all") { + $stream5_tcp_engine .= ", \\\n\tports server"; + $stream5_tcp_engine .= " all"; + } + else { + $tmp = trim(filter_expand_alias($v['ports_server'])); + if (!empty($tmp)) { + $stream5_tcp_engine .= ", \\\n\tports server"; + $stream5_tcp_engine .= " " . trim(preg_replace('/\s+/', ' ', $tmp)); + } + else + log_error("[snort] WARNING: unable to resolve Ports Server Alias [{$v['ports_server']}] for Stream5 TCP engine '{$v['name']}' ... defaulting to none."); + } + } + + // Make sure the "ports" parameter is set, or else default to a safe value + if (strpos($stream5_tcp_engine, "ports ") === false) + $stream5_tcp_engine .= ", \\\n\tports both all"; + + // Add a pair of newlines to terminate this engine + $stream5_tcp_engine .= "\n\n"; + } + // Trim off the final trailing newline + $stream5_tcp_engine = rtrim($stream5_tcp_engine); + } + + // Configure the Stream5 UDP engine if it and Stream5 reassembly are enabled + if ($snortcfg['stream5_track_udp'] == "off" || $snortcfg['stream5_reassembly'] == "off") + $stream5_udp_engine = ""; + else { + $stream5_udp_engine = "preprocessor stream5_udp: "; + if (!empty($snortcfg['stream5_udp_timeout'])) + $stream5_udp_engine .= "timeout {$snortcfg['stream5_udp_timeout']}"; + else + $stream5_udp_engine .= "timeout 30"; + } + + // Configure the Stream5 ICMP engine if it and Stream5 reassembly are enabled + if ($snortcfg['stream5_track_icmp'] == "on" && $snortcfg['stream5_reassembly'] == "on") { + $stream5_icmp_engine = "preprocessor stream5_icmp: "; + if (!empty($snortcfg['stream5_icmp_timeout'])) + $stream5_icmp_engine .= "timeout {$snortcfg['stream5_icmp_timeout']}"; + else + $stream5_icmp_engine .= "timeout 30"; + } + else + $stream5_icmp_engine = ""; + + // Check for and configure Host Attribute Table if enabled $host_attrib_config = ""; if ($snortcfg['host_attribute_table'] == "on" && !empty($snortcfg['host_attribute_data'])) { file_put_contents("{$snortcfgdir}/host_attributes", base64_decode($snortcfg['host_attribute_data'])); @@ -3251,22 +3527,148 @@ EOD; $host_attrib_config .= "config max_attribute_services_per_host: {$snortcfg['max_attribute_services_per_host']}"; } - /* Finally, build the Snort configuration file */ - $snort_conf_text = <<<EOD + // Configure the HTTP_INSPECT preprocessor + // Get global options first and put into a string + $http_inspect_global = "preprocessor http_inspect: global "; + if ($snortcfg['http_inspect'] == "off") + $http_inspect_global .= "disabled "; + $http_inspect_global .= "\\\n\tiis_unicode_map unicode.map 1252 \\\n"; + $http_inspect_global .= "\tcompress_depth 65535 \\\n"; + $http_inspect_global .= "\tdecompress_depth 65535 \\\n"; + if (!empty($snortcfg['http_inspect_memcap'])) + $http_inspect_global .= "\tmemcap {$snortcfg['http_inspect_memcap']} \\\n"; + else + $http_inspect_global .= "\tmemcap 150994944 \\\n"; + if (!empty($snortcfg['http_inspect_max_gzip_mem'])) + $http_inspect_global .= "\tmax_gzip_mem {$snortcfg['http_inspect_max_gzip_mem']}"; + else + $http_inspect_global .= "\tmax_gzip_mem 838860"; + if ($snortcfg['http_inspect_proxy_alert'] == "on") + $http_inspect_global .= " \\\n\tproxy_alert"; + + $http_inspect_default_engine = array( "name" => "default", "bind_to" => "all", "server_profile" => "all", "enable_xff" => "off", + "log_uri" => "off", "log_hostname" => "off", "server_flow_depth" => 65535, "enable_cookie" => "on", + "client_flow_depth" => 1460, "extended_response_inspection" => "on", "no_alerts" => "off", + "unlimited_decompress" => "on", "inspect_gzip" => "on", "normalize_cookies" =>"on", "normalize_headers" => "on", + "normalize_utf" => "on", "normalize_javascript" => "on", "allow_proxy_use" => "off", "inspect_uri_only" => "off", + "max_javascript_whitespaces" => 200, "post_depth" => -1, "max_headers" => 0, "max_spaces" => 0, + "max_header_length" => 0, "ports" => "default" ); + $http_ports = str_replace(",", " ", snort_expand_port_range($snort_ports['http_ports'])); + $http_inspect_servers = ""; + + // Iterate configured HTTP_INSPECT servers and write them to string if HTTP_INSPECT enabled + if ($snortcfg['http_inspect'] <> "off") { + if (!is_array($snortcfg['http_inspect_engine']['item'])) + $snortcfg['http_inspect_engine']['item'] = array(); + + // If no http_inspect_engine is configured, use the default + if (empty($snortcfg['http_inspect_engine']['item'])) + $snortcfg['http_inspect_engine']['item'][] = $http_inspect_default_engine; + + foreach ($snortcfg['http_inspect_engine']['item'] as $f => $v) { + $buffer = "preprocessor http_inspect_server: \\\n"; + if ($v['name'] == "default") + $buffer .= "\tserver default \\\n"; + elseif (is_alias($v['bind_to'])) { + $tmp = trim(filter_expand_alias($v['bind_to'])); + if (!empty($tmp)) { + $tmp = preg_replace('/\s+/', ' ', $tmp); + $buffer .= "\tserver { {$tmp} } \\\n"; + } + else { + log_error("[snort] WARNING: unable to resolve IP Address Alias [{$v['bind_to']}] for HTTP_INSPECT server '{$v['name']}' ... skipping this server engine."); + continue; + } + } + else { + log_error("[snort] WARNING: unable to resolve IP Address Alias [{$v['bind_to']}] for HTTP_INSPECT server '{$v['name']}' ... skipping this server engine."); + continue; + } + $http_inspect_servers .= $buffer; + $http_inspect_servers .= "\tprofile {$v['server_profile']} \\\n"; + + if ($v['no_alerts'] == "on") + $http_inspect_servers .= "\tno_alerts \\\n"; + + if ($v['ports'] == "default" || empty($v['ports'])) + $http_inspect_servers .= "\tports { {$http_ports} } \\\n"; + elseif (is_alias($v['ports'])) { + $tmp = trim(filter_expand_alias($v['ports'])); + if (!empty($tmp)) { + $tmp = preg_replace('/\s+/', ' ', $tmp); + $tmp = snort_expand_port_range($tmp, ' '); + $http_inspect_servers .= "\tports { {$tmp} } \\\n"; + } + else { + log_error("[snort] WARNING: unable to resolve Ports Alias [{$v['ports']}] for HTTP_INSPECT server '{$v['name']}' ... using safe default instead."); + $http_inspect_servers .= "\tports { {$http_ports} } \\\n"; + } + } + else { + log_error("[snort] WARNING: unable to resolve Ports Alias [{$v['ports']}] for HTTP_INSPECT server '{$v['name']}' ... using safe default instead."); + $http_inspect_servers .= "\tports { {$http_ports} } \\\n"; + } + $http_inspect_servers .= "\tserver_flow_depth {$v['server_flow_depth']} \\\n"; + $http_inspect_servers .= "\tclient_flow_depth {$v['client_flow_depth']} \\\n"; + $http_inspect_servers .= "\thttp_methods { GET POST PUT SEARCH MKCOL COPY MOVE LOCK UNLOCK NOTIFY POLL BCOPY BDELETE BMOVE LINK UNLINK OPTIONS HEAD DELETE TRACE TRACK CONNECT SOURCE SUBSCRIBE UNSUBSCRIBE PROPFIND PROPPATCH BPROPFIND BPROPPATCH RPC_CONNECT PROXY_SUCCESS BITS_POST CCM_POST SMS_POST RPC_IN_DATA RPC_OUT_DATA RPC_ECHO_DATA } \\\n"; + $http_inspect_servers .= "\tpost_depth {$v['post_depth']} \\\n"; + $http_inspect_servers .= "\tmax_headers {$v['max_headers']} \\\n"; + $http_inspect_servers .= "\tmax_header_length {$v['max_header_length']} \\\n"; + $http_inspect_servers .= "\tmax_spaces {$v['max_spaces']}"; + if ($v['enable_xff'] == "on") + $http_inspect_servers .= " \\\n\tenable_xff"; + if ($v['enable_cookie'] == "on") + $http_inspect_servers .= " \\\n\tenable_cookie"; + if ($v['normalize_cookies'] == "on") + $http_inspect_servers .= " \\\n\tnormalize_cookies"; + if ($v['normalize_headers'] == "on") + $http_inspect_servers .= " \\\n\tnormalize_headers"; + if ($v['normalize_utf'] == "on") + $http_inspect_servers .= " \\\n\tnormalize_utf"; + if ($v['allow_proxy_use'] == "on") + $http_inspect_servers .= " \\\n\tallow_proxy_use"; + if ($v['inspect_uri_only'] == "on") + $http_inspect_servers .= " \\\n\tinspect_uri_only"; + if ($v['extended_response_inspection'] == "on") { + $http_inspect_servers .= " \\\n\textended_response_inspection"; + if ($v['inspect_gzip'] == "on") { + $http_inspect_servers .= " \\\n\tinspect_gzip"; + if ($v['unlimited_decompress'] == "on") + $http_inspect_servers .= " \\\n\tunlimited_decompress"; + } + if ($v['normalize_javascript'] == "on") { + $http_inspect_servers .= " \\\n\tnormalize_javascript"; + $http_inspect_servers .= " \\\n\tmax_javascript_whitespaces {$v['max_javascript_whitespaces']}"; + } + } + if ($v['log_uri'] == "on") + $http_inspect_servers .= " \\\n\tlog_uri"; + if ($v['log_hostname'] == "on") + $http_inspect_servers .= " \\\n\tlog_hostname"; + + // Add a pair of trailing newlines to terminate this server config + $http_inspect_servers .= "\n\n"; + } + /* Trim off the final trailing newline */ + $http_inspect_server = rtrim($http_inspect_server); + } + + // Finally, build the Snort configuration file + $snort_conf_text = <<<EOD # snort configuration file # generated automatically by the pfSense subsystems do not modify manually # Define Local Network # -var HOME_NET [{$home_net}] -var EXTERNAL_NET [{$external_net}] +ipvar HOME_NET [{$home_net}] +ipvar EXTERNAL_NET [{$external_net}] # Define Rule Paths # var RULE_PATH {$snortcfgdir}/rules var PREPROC_RULE_PATH {$snortcfgdir}/preproc_rules # Define Servers # -{$vardef} +{$ipvardef} # Define Server Ports # {$portvardef} @@ -3302,7 +3704,7 @@ config show_year # For more information see README.stream5 # {$paf_max_pdu_config} -#Configure dynamically loaded libraries +# Configure dynamically loaded libraries dynamicpreprocessor directory {$snort_dirs['dynamicpreprocessor']} dynamicengine directory {$snort_dirs['dynamicengine']} dynamicdetection directory {$snort_dirs['dynamicrules']} @@ -3316,16 +3718,23 @@ dynamicdetection directory {$snort_dirs['dynamicrules']} # preprocessor normalize_icmp6 # Flow and stream # -preprocessor frag3_global: {$frag3_memcap}, {$frag3_max_frags}{$frag3_disabled} -preprocessor frag3_engine: {$frag3_policy} detect_anomalies {$frag3_timeout} {$frag3_overlap_limit} {$frag3_min_frag_len} +{$frag3_global} -preprocessor stream5_global:{$stream5_reassembly} track_tcp {$stream5_track_tcp}, track_udp {$stream5_track_udp}, track_icmp {$stream5_track_icmp}, max_tcp 262144, max_udp 131072, max_active_responses 2, min_response_seconds 5{$stream5_mem_cap} -preprocessor stream5_tcp: {$stream5_policy}, {$stream5_overlap_limit}, {$stream5_tcp_timeout}, ports both all{$stream5_max_queued_bytes_type}{$stream5_max_queued_segs_type}{$stream5_require_3whs}{$stream5_no_reassemble_async}{$stream5_dont_store_lg_pkts} -preprocessor stream5_udp: {$stream5_udp_timeout} -preprocessor stream5_icmp: {$stream5_icmp_timeout} +{$frag3_engine} -{$snort_preprocessors} +{$stream5_global} +{$stream5_tcp_engine} + +{$stream5_udp_engine} + +{$stream5_icmp_engine} + +# HTTP Inspect # +{$http_inspect_global} + +{$http_inspect_servers} +{$snort_preprocessors} {$host_attrib_config} # Snort Output Logs # @@ -3344,10 +3753,9 @@ output alert_csv: alert timestamp,sig_generator,sig_id,sig_rev,msg,proto,src,src # Rules Selection # {$selected_rules_sections} - EOD; - /* write out snort.conf */ + // Write out snort.conf file $conf = fopen("{$snortcfgdir}/snort.conf", "w"); if(!$conf) { log_error("Could not open {$snortcfgdir}/snort.conf for writing."); @@ -3356,7 +3764,7 @@ EOD; fwrite($conf, $snort_conf_text); fclose($conf); unset($snort_conf_text, $selected_rules_sections, $suppress_file_name, $snort_misc_include_rules, $spoink_type, $snortunifiedlog_type, $alertsystemlog_type); - unset($home_net, $external_net, $vardef, $portvardef); + unset($home_net, $external_net, $ipvardef, $portvardef); } /* Uses XMLRPC to synchronize the changes to a remote node */ |