diff options
Diffstat (limited to 'config/snort/snort.inc')
| -rw-r--r-- | config/snort/snort.inc | 751 |
1 files changed, 751 insertions, 0 deletions
diff --git a/config/snort/snort.inc b/config/snort/snort.inc new file mode 100644 index 00000000..a8b16681 --- /dev/null +++ b/config/snort/snort.inc @@ -0,0 +1,751 @@ +<?php +/* $Id$ */ +/* + snort.inc + Copyright (C) 2006 Scott Ullrich + part of pfSense + 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("pfsense-utils.inc"); + +/* define oinkid */ +if($config['installedpackages']['snort']) + $oinkid = $config['installedpackages']['snort']['config'][0]['oinkmastercode']; + +function sync_package_snort_reinstall() +{ + global $config; + if(!$config['installedpackages']['snort']) + return; + + /* create snort configuration file */ + create_snort_conf(); + + /* start snort service */ + start_service("snort"); +} + +function sync_package_snort() +{ + global $config, $g; + + mwexec("mkdir -p /var/log/snort/"); + + if(!file_exists("/var/log/snort/alert")) + touch("/var/log/snort/alert"); + + /* snort -> advanced features */ + $bpfbufsize = $config['installedpackages']['snortadvanced']['config'][0]['bpfbufsize']; + $bpfmaxbufsize = $config['installedpackages']['snortadvanced']['config'][0]['bpfmaxbufsize']; + $bpfmaxinsns = $config['installedpackages']['snortadvanced']['config'][0]['bpfmaxinsns']; + + /* set the snort performance model */ + if($config['installedpackages']['snort']['config'][0]['performance']) + $snort_performance = $config['installedpackages']['snort']['config'][0]['performance']; + else + $snort_performance = "ac-bnfa"; + + conf_mount_rw(); + /* create a few directories and ensure the sample files are in place */ + exec("/bin/mkdir -p /usr/local/etc/snort"); + exec("/bin/mkdir -p /var/log/snort"); + exec("/bin/cp /usr/local/etc/snort/unicode.map-sample /usr/local/etc/snort/unicode.map"); + exec("/bin/cp /usr/local/etc/snort/classification.config-sample /usr/local/etc/snort/classification.config"); + exec("/bin/cp /usr/local/etc/snort/gen-msg.map-sample /usr/local/etc/snort/gen-msg.map"); + exec("/bin/cp /usr/local/etc/snort/generators-sample /usr/local/etc/snort/generators"); + exec("/bin/cp /usr/local/etc/snort/reference.config-sample /usr/local/etc/snort/reference.config"); + exec("/bin/cp /usr/local/etc/snort/sid-msg.map-sample /usr/local/etc/snort/sid-msg.map"); + exec("/bin/cp /usr/local/etc/snort/sid-sample /usr/local/etc/snort/sid"); + exec("/bin/cp /usr/local/etc/snort/threshold.conf-sample /usr/local/etc/snort/threshold.conf"); + exec("/bin/cp /usr/local/etc/snort/unicode.map-sample /usr/local/etc/snort/unicode.map"); + exec("/bin/rm -f /usr/local/etc/rc.d/snort"); + + $first = 0; + $snortInterfaces = array(); /* -gtm */ + + $if_list = $config['installedpackages']['snort']['config'][0]['iface_array']; + $if_array = split(',', $if_list); + //print_r($if_array); + if($if_array) { + foreach($if_array as $iface) { + $if = convert_friendly_interface_to_real_interface_name($iface); + + if($config['interfaces'][$iface]['ipaddr'] == "pppoe") { + $if = "ng0"; + } + + /* build a list of user specified interfaces -gtm */ + if($if){ + array_push($snortInterfaces, $if); + $first = 1; + } + } + + if (count($snortInterfaces) < 1) { + //log_error("Snort will not start. You must select an interface for it to listen on."); + echo "Snort will not start. You must select an interface for it to listen on."; + return; + } + } + //print_r($snortInterfaces); + + /* create log directory */ + $start = "/bin/mkdir -p /var/log/snort"; + + /* snort advanced features - bpf tuning */ + if($bpfbufsize) + $start .= ";sysctl net.bpf.bufsize={$bpfbufsize}"; + if($bpfmaxbufsize) + $start .= ";sysctl net.bpf.maxbufsize={$bpfmaxbufsize}"; + if($bpfmaxinsns) + $start .= ";sysctl net.bpf.maxinsns={$bpfmaxinsns}"; + + /* go ahead and issue bpf changes */ + if($bpfbufsize) + mwexec_bg("sysctl net.bpf.bufsize={$bpfbufsize}"); + if($bpfmaxbufsize) + mwexec_bg("sysctl net.bpf.maxbufsize={$bpfmaxbufsize}"); + if($bpfmaxinsns) + mwexec_bg("sysctl net.bpf.maxinsns={$bpfmaxinsns}"); + + /* always stop snort2c before starting snort -gtm */ + $start .= ";/usr/bin/killall snort2c"; + + /* start a snort process for each interface -gtm */ + /* Note the sleep delay. Seems to help getting mult interfaces to start -gtm */ + foreach($snortInterfaces as $snortIf) + { + $start .= ";sleep 8;snort -c /usr/local/etc/snort/snort.conf -l /var/log/snort -i {$snortIf} -A fast -D"; + } + + /* if block offenders is checked, start snort2c */ + if($_POST['blockoffenders']) + $start .= ";sleep 8;snort2c -w /var/db/whitelist -a /var/log/snort/alert"; + + $sample_before = "\nBEFORE_MEM=`top | grep Free | grep Wired | awk '{print \$10}'`\n"; + $sample_after = "\nAFTER_MEM=`top | grep Free | grep Wired | awk '{print \$10}'`\n"; + $sleep_before_final = "\necho \"Sleeping before final memory sampling...\"\nsleep 17"; + $total_free_after = "\nTOTAL_USAGE=`top | grep snort | grep -v grep | awk '{ print \$6 }'`\n"; + $echo_usage = "\necho \"Ram free BEFORE starting Snort: \${BEFORE_MEM} -- Ram free AFTER starting Snort: \${AFTER_MEM}\" -- Mode {$snort_performance} -- Snort memory usage: \$TOTAL_USAGE | logger -p daemon.info -i -t SnortStartup\n"; + + /* write out rc.d start/stop file */ + write_rcfile(array( + "file" => "snort.sh", + "start" => "{$sample_before}{$start}{$sleep_before_final}{$sample_after}{$echo_usage}", + "stop" => "/usr/bin/killall snort; killall snort2c" + ) + ); + + /* create snort configuration file */ + create_snort_conf(); + + /* start snort service */ + conf_mount_ro(); + start_service("snort"); +} + +function create_snort_conf() { + global $config, $g; + /* write out snort.conf */ + $snort_conf_text = generate_snort_conf(); + conf_mount_rw(); + $conf = fopen("/usr/local/etc/snort/snort.conf", "w"); + if(!$conf) { + log_error("Could not open /usr/local/etc/snort/snort.conf for writing."); + exit; + } + fwrite($conf, $snort_conf_text); + fclose($conf); + conf_mount_ro(); +} + +function snort_deinstall() { + $text_ww = "*/60\t* \t 1\t *\t *\t root\t /usr/bin/nice -n20 /usr/local/pkg/snort_check_for_rule_updates.php"; + $filenamea = "/etc/crontab"; + /* remove auto rules update helper */ + remove_text_from_file($filenamea, $text_ww); + /* remove custom sysctl */ + remove_text_from_file("/etc/sysctl.conf", "sysctl net.bpf.bufsize=20480"); + /* decrease bpf buffers back to 4096, from 20480 */ + exec("/sbin/sysctl net.bpf.bufsize=4096"); + exec("/usr/bin/killall snort"); + sleep(5); + exec("/usr/bin/killall -9 snort"); + exec("rm -f /usr/local/etc/rc.d/snort*"); + exec("rm -rf /usr/local/etc/snort*"); + exec("cd /var/db/pkg && pkg_delete `ls | grep snort`"); +} + +function generate_snort_conf() { + global $config, $g; + conf_mount_rw(); + /* obtain external interface */ + /* XXX: make multi wan friendly */ + $snort_ext_int = $config['installedpackages']['snort']['config'][0]['iface_array'][0]; + + $snort_config_pass_thru = $config['installedpackages']['snortadvanced']['config'][0]['configpassthru']; + + /* add auto update scripts to /etc/crontab */ + $text_ww = "*/60\t* \t 1\t *\t *\t root\t /usr/bin/nice -n20 /usr/local/pkg/snort_check_for_rule_updates.php"; + $filenamea = "/etc/crontab"; + remove_text_from_file($filenamea, $text_ww); + add_text_to_file($filenamea, $text_ww); + exec("killall -HUP cron"); + + /* should we install a automatic update crontab entry? */ + $automaticrulesupdate = $config['installedpackages']['snort']['config'][0]['automaticrulesupdate']; + + /* if user is on pppoe, we really want to use ng0 interface */ + if($config['interfaces'][$snort_ext_int]['ipaddr'] == "pppoe") + $snort_ext_int = "ng0"; + + /* set the snort performance model */ + if($config['installedpackages']['snort']['config'][0]['performance']) + $snort_performance = $config['installedpackages']['snort']['config'][0]['performance']; + else + $snort_performance = "ac-bnfa"; + + /* open snort2c's whitelist for writing */ + $whitelist = fopen("/var/db/whitelist", "w"); + if(!$whitelist) { + log_error("Could not open /var/db/whitelist for writing."); + return; + } + + /* build an interface array list */ + $int_array = array('lan'); + for ($j = 1; isset ($config['interfaces']['opt' . $j]); $j++) + if(isset($config['interfaces']['opt' . $j]['enable'])) + if(!$config['interfaces']['opt' . $j]['gateway']) + $int_array[] = "opt{$j}"; + + /* if user has defined a custom ssh port, use it */ + if($config['system']['ssh']['port']) + $ssh_port = $config['system']['ssh']['port']; + else + $ssh_port = "22"; + + /* iterate through interface list and write out whitelist items + * and also compile a home_net list for snort. + */ + foreach($int_array as $int) { + /* calculate interface subnet information */ + $ifcfg = &$config['interfaces'][$int]; + $subnet = gen_subnet($ifcfg['ipaddr'], $ifcfg['subnet']); + $subnetmask = gen_subnet_mask($ifcfg['subnet']); + if($subnet == "pppoe" or $subnet == "dhcp") { + $subnet = find_interface_ip("ng0"); + if($subnet) + $home_net .= "{$subnet} "; + } else { + if ($subnet) + if($ifcfg['subnet']) + $home_net .= "{$subnet}/{$ifcfg['subnet']} "; + } + } + + /* add all WAN ips to the whitelist */ + $wan_if = get_real_wan_interface(); + $ip = find_interface_ip($wan_if); + if($ip) + $home_net .= "{$ip} "; + + /* Add Gateway on WAN interface to whitelist (For RRD graphs) */ + $int = convert_friendly_interface_to_real_interface_name("WAN"); + $gw = get_interface_gateway($int); + if($gw) + $home_net .= "{$gw} "; + + /* Add DNS server for WAN interface to whitelist */ + $dns_servers = get_dns_servers(); + foreach($dns_servers as $dns) { + if($dns) + $home_net .= "{$dns} "; + } + + /* Add loopback to whitelist (ftphelper) */ + $home_net .= "127.0.0.1 "; + + /* iterate all vips and add to whitelist */ + if($config['virtualip']) + foreach($config['virtualip']['vip'] as $vip) + if($vip['subnet']) + $home_net .= $vip['subnet'] . " "; + + if($config['installedpackages']['snortwhitelist']) + foreach($config['installedpackages']['snortwhitelist']['config'] as $snort) + if($snort['ip']) + $home_net .= $snort['ip'] . " "; + + /* write out whitelist, convert spaces to carriage returns */ + $whitelist_home_net = str_replace(" ", " ", $home_net); + $whitelist_home_net = str_replace(" ", "\n", $home_net); + + /* make $home_net presentable to snort */ + $home_net = trim($home_net); + $home_net = str_replace(" ", ",", $home_net); + $home_net = "[{$home_net}]"; + + /* foreach through whitelist, writing out to file */ + $whitelist_split = split("\n", $whitelist_home_net); + foreach($whitelist_split as $wl) + if(trim($wl)) + fwrite($whitelist, trim($wl) . "\n"); + + /* should we whitelist vpns? */ + $whitelistvpns = $config['installedpackages']['snort']['config'][0]['whitelistvpns']; + + /* grab a list of vpns and whitelist if user desires */ + if($whitelistvpns) { + $vpns_list = get_vpns_list(); + $whitelist_vpns = split(" ", $vpns_list); + foreach($whitelist_split as $wl) + if(trim($wl)) + fwrite($whitelist, trim($wl) . "\n"); + } + + /* close file */ + fclose($whitelist); + + /* generate rule sections to load */ + $enabled_rulesets = $config['installedpackages']['snort']['rulesets']; + if($enabled_rulesets) { + $selected_rules_sections = ""; + $enabled_rulesets_array = split("\|\|", $enabled_rulesets); + foreach($enabled_rulesets_array as $enabled_item) + $selected_rules_sections .= "include \$RULE_PATH/{$enabled_item}\n"; + } + + conf_mount_ro(); + + /* build snort configuration file */ + $snort_conf_text = <<<EOD + +# snort configuration file +# generated by the pfSense +# package manager system +# see /usr/local/pkg/snort.inc +# for more information + +var HOME_NET {$home_net} +var EXTERNAL_NET !\$HOME_NET + +var DNS_SERVERS \$HOME_NET +var SMTP_SERVERS \$HOME_NET +var HTTP_SERVERS \$HOME_NET +var SQL_SERVERS \$HOME_NET +var TELNET_SERVERS \$HOME_NET +var SNMP_SERVERS \$HOME_NET +var FTP_SERVERS \$HOME_NET +var SSH_SERVERS \$HOME_NET +var POP_SERVERS \$HOME_NET +var IMAP_SERVERS \$HOME_NET +var RPC_SERVERS \$HOME_NET +var WWW_SERVERS \$HOME_NET +var 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] + +portvar HTTP_PORTS 80 +portvar SHELLCODE_PORTS !80 +portvar ORACLE_PORTS 1521 +portvar AUTH_PORTS 113 +portvar DNS_PORTS 53 +portvar FINGER_PORTS 79 +portvar FTP_PORTS 21 +portvar IMAP_PORTS 143 +portvar IRC_PORTS [6665,6666,6667,6668,6669,7000] +portvar MSSQL_PORTS 1433 +portvar NNTP_PORTS 119 +portvar POP2_PORTS 109 +portvar POP3_PORTS 110 +portvar SUNRPC_PORTS [111,32770,32771,32772,32773,32774,32775,32776,32777,32778,32779] +portvar RLOGIN_PORTS 513 +portvar RSH_PORTS 514 +portvar SMB_PORTS [139,445] +portvar SMTP_PORTS 25 +portvar SNMP_PORTS 161 +portvar SSH_PORTS {$ssh_port} +portvar TELNET_PORTS 23 +portvar MAIL_PORTS [25,143,465,691] +portvar SSL_PORTS [25,443,465,636,993,995] + +var RULE_PATH /usr/local/etc/snort/rules + +# Configure the snort decoder +config checksum_mode: all +config disable_decode_alerts +config disable_tcpopt_experimental_alerts +config disable_tcpopt_obsolete_alerts +config disable_ttcp_alerts +config disable_tcpopt_alerts +config disable_ipopt_alerts +config disable_decode_drops + +#Configure the detection engine +#Use lower memory models +config detection: search-method {$snort_performance} +config detection: max_queue_events 5 +config event_queue: max_queue 8 log 3 order_events content_length + +#Configure dynamic loaded libraries +dynamicpreprocessor file /usr/local/lib/snort/dynamicpreprocessor/libsf_dcerpc_preproc.so +dynamicpreprocessor file /usr/local/lib/snort/dynamicpreprocessor/libsf_dns_preproc.so +dynamicpreprocessor file /usr/local/lib/snort/dynamicpreprocessor/libsf_ftptelnet_preproc.so +dynamicpreprocessor file /usr/local/lib/snort/dynamicpreprocessor/libsf_smtp_preproc.so +dynamicpreprocessor file /usr/local/lib/snort/dynamicpreprocessor/libsf_ssh_preproc.so + +dynamicengine /usr/local/lib/snort/dynamicengine/libsf_engine.so + +#Flow and stream + +preprocessor frag3_global: max_frags 8192 +preprocessor frag3_engine: policy last detect_anomalies +preprocessor stream5_global: max_tcp 8192, track_tcp yes, \ +track_udp yes, track_icmp yes +preprocessor stream5_tcp: policy BSD, ports both all, use_static_footprint_sizes +preprocessor stream5_udp +preprocessor stream5_icmp + +#HTTP Inspect +preprocessor http_inspect: global iis_unicode_map unicode.map 1252 + +preprocessor http_inspect_server: server default \ + ports { 80 8080 3128 } \ + no_alerts \ + non_strict \ + non_rfc_char { 0x00 0x01 0x02 0x03 0x04 0x05 0x06 0x07 } \ + flow_depth 0 \ + apache_whitespace yes \ + directory no \ + iis_backslash no \ + u_encode yes \ + ascii no \ + chunk_length 500000 \ + bare_byte yes \ + double_decode yes \ + iis_unicode yes \ + iis_delimiter yes \ + multi_slash no + +#Other preprocs +preprocessor rpc_decode: 111 32770 32771 32772 32773 32774 32775 32776 32777 32778 32779 +preprocessor bo + +preprocessor ftp_telnet: global \ +inspection_type stateless +preprocessor ftp_telnet_protocol: \ + ftp server default \ + def_max_param_len 100 \ + ports { 21 } \ + 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 OPTS 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 100 + +preprocessor SMTP: \ + ports { 25 465 691 } \ + inspection_type stateful \ + normalize cmds \ + 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 } + + + + +#sf Portscan +preprocessor sfportscan: proto { all } \ + scan_type { all } \ + sense_level { low } \ + ignore_scanners { \$HOME_NET } + +preprocessor dcerpc: \ + autodetect \ + max_frag_size 3000 \ + memcap 100000 + +preprocessor dns: ports { 53 } enable_rdata_overflow + +#Output plugins +#output database: alert +output alert_syslog: LOG_AUTH LOG_ALERT LOG_CONS LOG_NDELAY LOG_PERROR LOG_PID + +output alert_unified: filename alert + +#Required files +include /usr/local/etc/snort/classification.config +include /usr/local/etc/snort/reference.config + +# Include any thresholding or suppression commands. See threshold.conf in the +# include threshold.conf + +# Snort user pass through configuration +{$snort_config_pass_thru} + +#Rulesets, all optional +{$selected_rules_sections} + +EOD; + + return $snort_conf_text; +} + +/* check downloaded text from snort.org to make sure that an error did not occur + * for example, if you are not a premium subscriber you can only download rules + * so often, etc. + */ +function check_for_common_errors($filename) { + global $snort_filename, $snort_filename_md5, $console_mode; + ob_flush(); + $contents = file_get_contents($filename); + if(stristr($contents, "You don't have permission")) { + if(!$console_mode) { + update_all_status("An error occured. Scroll down to inspect it's contents."); + hide_progress_bar_status(); + } else { + log_error("An error occured. Scroll down to inspect it's contents."); + echo "An error occured. Scroll down to inspect it's contents."; + } + if(!$console_mode) { + echo " + <center> + <div id='error' style='background:white;width:90%'> + <!-- TODO: The below paragraphs are kind of stupid. Use CSS instead --> + <p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p> + <p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p> + <p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p> + <p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p> + <p>The following error occured while downloading the snort rules file from snort.org:</p> + {$contents} + <p> </p><p> </p><p> </p><p> </p><p> </p><p> </p><p> </p> + </div> + </center> + "; + } else { + $contents = strip_tags($contents); + log_error("Error downloading snort rules: {$contents}"); + echo "Error downloading snort rules: {$contents}"; + } + scroll_down_to_bottom_of_page(); + exit; + } +} + +/* force browser to scroll all the way down */ +function scroll_down_to_bottom_of_page() { + global $snort_filename, $console_mode; + ob_flush(); + if(!$console_mode) + echo "\n<script type=\"text/javascript\">parent.scrollTo(0,1500);\n</script>"; +} + +/* ensure downloaded file looks sane */ +function verify_downloaded_file($filename) { + global $snort_filename, $snort_filename_md5, $console_mode; + ob_flush(); + if(filesize($filename)<9500) { + if(!$console_mode) { + update_all_status("Checking {$filename}..."); + check_for_common_errors($filename); + } + } + update_all_status("Verifying {$filename}..."); + if(!file_exists($filename)) { + if(!$console_mode) { + update_all_status("Could not fetch snort rules ({$filename}). Check oinkid key and dns and try again."); + hide_progress_bar_status(); + } else { + log_error("Could not fetch snort rules ({$filename}). Check oinkid key and dns and try again."); + echo "Could not fetch snort rules ({$filename}). Check oinkid key and dns and try again."; + } + exit; + } + update_all_status("Verifyied {$filename}."); +} + +/* extract rules */ +function extract_snort_rules_md5($tmpfname) { + global $snort_filename, $snort_filename_md5, $console_mode; + ob_flush(); + if(!$console_mode) { + $static_output = gettext("Extracting snort rules..."); + update_all_status($static_output); + } + exec("/usr/bin/tar xzf {$tmpfname}/{$snort_filename} -C /usr/local/etc/snort/"); + if(!$console_mode) { + $static_output = gettext("Snort rules extracted."); + update_all_status($static_output); + } else { + log_error("Snort rules extracted."); + echo "Snort rules extracted."; + } +} + +/* verify MD5 against downloaded item */ +function verify_snort_rules_md5($tmpfname) { + global $snort_filename, $snort_filename_md5, $console_mode; + ob_flush(); + if(!$console_mode) { + $static_output = gettext("Verifying md5 signature..."); + update_all_status($static_output); + } + $md5 = file_get_contents("{$tmpfname}/{$snort_filename_md5}"); + $file_md5_ondisk = `/sbin/md5 {$tmpfname}/{$snort_filename} | /usr/bin/awk '{ print $4 }'`; + if($md5 <> $file_md5_ondisk) { + if(!$console_mode) { + $static_output = gettext("snort rules: md5 signature of rules mismatch."); + update_all_status($static_output); + hide_progress_bar_status(); + } else { + log_error("snort rules: md5 signature of rules mismatch."); + echo "snort rules: md5 signature of rules mismatch."; + } + exit; + } +} + +/* hide progress bar */ +function hide_progress_bar_status() { + global $snort_filename, $snort_filename_md5, $console_mode; + ob_flush(); + if(!$console_mode) + echo "\n<script type=\"text/javascript\">document.progressbar.style.visibility='hidden';\n</script>"; +} + +/* update both top and bottom text box during an operation */ +function update_all_status($status) { + global $snort_filename, $snort_filename_md5, $console_mode; + ob_flush(); + if(!$console_mode) { + update_status($status); + update_output_window($status); + } +} + +/* obtain alert description for an ip address */ +function get_snort_alert($ip) { + global $snort_alert_file_split, $snort_config; + if(!file_exists("/var/log/snort/alert")) + return; + if(!$snort_config) + $snort_config = read_snort_config_cache(); + if($snort_config[$ip]) + return $snort_config[$ip]; + if(!$snort_alert_file_split) + $snort_alert_file_split = split("\n", file_get_contents("/var/log/snort/alert")); + foreach($snort_alert_file_split as $fileline) { + if (preg_match("/\[\*\*\] (\[.*\]) (.*) (\[\*\*\])/", $fileline, $matches)) + $alert_title = $matches[2]; + if (preg_match("/(\b(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\b)/", $fileline, $matches)) + $alert_ip = $matches[0]; + if($alert_ip == $ip) { + if(!$snort_config[$ip]) + $snort_config[$ip] = $alert_title; + return $alert_title; + } + } + return "n/a"; +} + +function make_clickable($buffer) { + global $config, $g; + /* if clickable urls is disabled, simply return buffer back to caller */ + $clickablalerteurls = $config['installedpackages']['snort']['config'][0]['oinkmastercode']; + if(!$clickablalerteurls) + return $buffer; + $buffer = eregi_replace("(^|[ \n\r\t])((http(s?)://)(www\.)?([a-z0-9_-]+(\.[a-z0-9_-]+)+)(/[^/ \n\r]*)*)","\\1<a href=\"\\2\" target=\"_blank\">\\2</a>", $buffer); + $buffer = eregi_replace("(^|[ \n\r\t])((ftp://)(www\.)?([a-z0-9_-]+(\.[a-z0-9_-]+)+)(/[^/ \n\r]*)*)","\\1<a href=\"\\2\" target=\"_blank\">\\2</a>", $buffer); + $buffer = eregi_replace("([a-z_-][a-z0-9\._-]*@[a-z0-9_-]+(\.[a-z0-9_-]+)+)","<a href=\"mailto:\\1\">\\1</a>", $buffer); + $buffer = eregi_replace("(^|[ \n\r\t])(www\.([a-z0-9_-]+(\.[a-z0-9_-]+)+)(/[^/ \n\r]*)*)","\\1<a href=\"http://\\2\" target=\"_blank\">\\2</a>", $buffer); + $buffer = eregi_replace("(^|[ \n\r\t])(ftp\.([a-z0-9_-]+(\.[a-z0-9_-]+)+)(/[^/ \n\r]*)*)","\\1<a href=\"ftp://\\2\" target=\"_blank\">\\2</a>", $buffer); + + return $buffer; +} + +function read_snort_config_cache() { + global $g, $config, $snort_config; + if($snort_config) + return $snort_config; + if(file_exists($g['tmp_path'] . '/snort_config.cache')) { + $snort_config = unserialize(file_get_contents($g['tmp_path'] . '/snort_config.cache')); + return $snort_config; + } + return; +} + +function write_snort_config_cache($snort_config) { + global $g, $config; + conf_mount_rw(); + $configcache = fopen($g['tmp_path'] . '/snort_config.cache', "w"); + if(!$configcache) { + log_error("Could not open {$g['tmp_path']}/snort_config.cache for writing."); + return false; + } + fwrite($configcache, serialize($snort_config)); + fclose($configcache); + conf_mount_ro(); + return true; +} + +function snort_advanced() { + global $g, $config; + sync_package_snort(); +} + +?> |