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modsec_block.pl
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Edit: modsec_block.pl
#!/usr/bin/perl use Time::Local 'timelocal_nocheck'; use Fcntl qw(:flock SEEK_END); use Sys::Hostname; use IO::Socket::INET; use Data::Dumper; use JSON; use strict; use warnings; ##TODO: flush out the mtype stuff and possibly add a file to set mtype by rule ## for now mtypes are: ## 1 = general bad rule (injection attempts, etc) ## 2 = crawler type rules (mj12bot, googlebot/etc limiters, etc) ## 3 = post logging rules (wp-login/comments/administrator/etc) - this may be split up in the future ## 4 = general error logging (things that dont really have an ID etc) my %checked = map { $_, 1 } qw( 345114 345115 345117 900165 900291 900402 900405 900406 900407 900408 900409 900911 900912 900923 900934 900935 900936 9009999 ); # how many kb max to go back in log if no start point avail (tail -c this much *1024) my $MAX_BACKTRACK = 100; my $STATUS_FILE = '/opt/eig_linux/var/modsec_error_log_status'; my $LOCK_FILE = '/opt/eig_linux/var/modsec_block_run_lock'; my $ERROR_LOG = '/usr/local/apache/logs/error_log'; my %vulnscan; # ip => count my $vulnscan_enabled = -f '/opt/eig_linux/etc/puppetfeatures/firewalling_vulnscan'; my @microsoft_cidrs; # array of cidr2ints output: [integer network IP, integer netmask] sub ip2int { my ($ip) = @_; die "invalid IP: $ip" unless $ip =~ /^(\d+)\.(\d+)\.(\d+)\.(\d+)$/; die "invalid IP: $ip" unless $1 < 256 && $2 < 256 && $3 < 256 && $4 < 256; return ($1 << 24) | ($2 << 16) | ($3 << 8) | $4; } sub cidr2ints { my ($cidr) = @_; die "invalid CIDR: $cidr" unless $cidr =~ m,^(\d+\.\d+\.\d+\.\d+)/(\d+)$,; die "invalid CIDR: $cidr" unless $2 <= 32; my $prefix = $2; my $net = ip2int($1); my $mask = (0xFFFF_FFFF << (32 - $prefix)) & 0xFFFF_FFFF; return $net & $mask, $mask; } sub in_cidr { my ($intip, $net, $mask) = @_; return ($intip & $mask) == $net; } sub is_microsoft { my ($ip) = @_; eval { $ip = ip2int($ip) }; return 0 if $@; for my $cidr (@microsoft_cidrs) { # inlined in_cidr - this is 3x faster return 1 if ($ip & $cidr->[1]) == $cidr->[0]; } return 0; } while (defined(my $line = <DATA>)) { next unless $line =~ /^(\S+)/; eval { push @microsoft_cidrs, [cidr2ints($1)] }; if ($@) { warn "failed to populate microsoft CIDR ranges: $@"; last; } } my $f_l; open($f_l, '>', $LOCK_FILE) or exit(42); flock($f_l, LOCK_EX | LOCK_NB) or exit(43); # random sleep since all servers are sending these batches every 5 min, avoid slamming glog sleep(int(rand(15))); our @TIMECACHE = (0,0); our $GL_SOCKET; # used by send_to_graylog to fake object persistence our $HOSTNAME = hostname(); my $fh; my %USERDOMAINS = (); my %USEROWNERS = (); open($fh, '<', '/etc/userdomains'); while (<$fh>) { chomp; if (/^(\S\S+): (\S+)$/) { $USERDOMAINS{$1} = $2; $USEROWNERS{$2} = $2; } } close($fh); if ($HOSTNAME !~ /\.hostgator\.com/) { # for now to save time on shared, should extend at some point open($fh, '<', '/etc/trueuserowners'); while (<$fh>) { chomp; if (/^(\w+): (\w+)$/ && $2 ne 'root' && $2 ne '*') { $USEROWNERS{$1} = $2; } } close($fh); } my $offsetbytes = 0; if (-e $STATUS_FILE) { open($fh, '<', $STATUS_FILE); chomp($offsetbytes = <$fh>); close($fh); if ($offsetbytes !~ /^[0-9]+$/) { $offsetbytes = 0; } } open($fh, '<', $ERROR_LOG) or die('could not open error log'); my $logsize = (stat($ERROR_LOG))[7]; # get the size after opening to prevent weird race if ($logsize < $offsetbytes) { $offsetbytes = 0; } if ($logsize >= $offsetbytes && $offsetbytes > 0) { seek($fh, $offsetbytes, 0); } elsif (!$offsetbytes && $logsize > ($MAX_BACKTRACK + 3) * 1024) { # if the log is just a little too long, just get it all $offsetbytes = $logsize - $MAX_BACKTRACK*1024; seek($fh, $logsize - $MAX_BACKTRACK*1024, 0); } my $readbytes = 0; my $temphost; while (<$fh>) { $readbytes += length($_); if (/ModSecurity:/) { chomp; my $record = parse_modsec_line($_); if ($record) { next unless exists $checked{$record->{'_id'}}; $temphost = $record->{'_hostname'}; $temphost =~ s/^www\.//; if ($USERDOMAINS{$temphost}) { $record->{'_user_host_id'} = $USERDOMAINS{$temphost} . '-' . $HOSTNAME; $record->{'_owner_host_id'} = $USEROWNERS{$USERDOMAINS{$temphost}} . '-' . $HOSTNAME; } elsif ($record->{'_uri'} =~ /^\/+~([a-z0-9]+)\// && $USEROWNERS{$1}) { $record->{'_user_host_id'} = $1 . '-' . $HOSTNAME; $record->{'_owner_host_id'} = $USEROWNERS{$1} . '-' . $HOSTNAME; } if ($record->{'_remote_addr'} =~ /^([0-9]+\.[0-9]+\.[0-9]+)\.[0-9]+$/) { $record->{'_remote_24'} = $1; } if ($record->{'_msg'} =~ /logging/) { $record->{'_mtype'} = 3; } elsif ($record->{'_msg'} =~ /bot|crawler/i) { # might need to enhance $record->{'_mtype'} = 2; } elsif (!$record->{'_id'} || !$record->{'_remote_addr'}) { $record->{'_mtype'} = 4; } else { $record->{'_mtype'} = 1; } if ($vulnscan_enabled && defined $record->{'_remote_addr'} && defined $record->{'_msg'} && $record->{'_msg'} =~ /404 php LOGGING|Empty User-Agent LOGGING|Empty UA autodiscover|Vulnerability Scan RBL/ && is_microsoft($record->{'_remote_addr'})) { $vulnscan{$record->{'_remote_addr'}}++; } send_to_graylog($record); } } elsif (/mod_rbld.c/) { my $record = parse_rbld_line($_); send_to_graylog($record) if ($record->{'_bl'}); } } close($fh); #print "$$: got offsetbytes $offsetbytes logsize $logsize readbytes $readbytes\n"; open($fh, '>', $STATUS_FILE); $offsetbytes += $readbytes; print $fh $offsetbytes; close($fh); # TODO load blockip as a library instead to call add_to_ipset in a loop $ENV{'RUSER'} ||= 'modsec_block.pl'; for my $ip (grep { $vulnscan{$_} > 5 } keys %vulnscan) { system '/sbin/blockip', '--ip', $ip; } sleep(1); close($f_l); sub parse_modsec_line { my $line = shift; # (month,day,time,year,loglevel,clientip,rest of modsec message to be parsed) my @lineparts = $line =~ m/^\[[A-Z][a-z][a-z] ([A-Z][a-z][a-z]) ([0-9][0-9]) ([0-9][0-9]:[0-9][0-9]:[0-9][0-9])\S* ([0-9][0-9][0-9][0-9])\] \[:?([a-z:0-9]+)\] (?:\[pid \S+ \d+\] )?\[client ([0-9.]+).*?ModSecurity: (.+)$/; return 0 if (scalar @lineparts != 7); my @toks = split(/ /, $lineparts[6]); my %tokout; my $quoted = 0; my $tkcount = 0; my $tkname = '_description'; # most are like [(tokname), but first one before [ starts as this if ($lineparts[6] =~ /Access denied with code ([0-9]+)[^0-9]/) { @{$tokout{'deny_code'}} = ($1); } @{$tokout{'timestamp'}} = (log2time($lineparts[0],$lineparts[1],$lineparts[3],$lineparts[2])); @{$tokout{'_remote_addr'}} = ($lineparts[5]); @{$tokout{'short_message'}} = ($lineparts[6]); foreach my $tok (@toks) { if (!$quoted && $tok =~ /^\[(\w+)$/) { $tkname = '_'.$1; @{$tokout{$tkname}} = (); $tkcount++; } elsif ($tok =~ /^\"/) { if (!$tkcount) { $quoted ^= 1 if ($tok!~/(?!\\)\"$/); } else { $tok=~s/^\"|(?!\\)\"\]$//g; } push @{$tokout{$tkname}}, $tok; } elsif (!$tkcount && $quoted && $tok=~/(?!\\)\"$/) { $quoted = 0; push @{$tokout{$tkname}}, $tok; } else { $tok=~s/(?!\\)\"\]$// if ($tkcount); push @{$tokout{$tkname}}, $tok; } } return { map { $_, join(' ', @{$tokout{$_}}) } keys %tokout }; } # this is a much simpler thing than modsec, but keeping it a function since we may need to expand when using on provo brands sub parse_rbld_line { my $line = shift; chomp($line); my @lineparts = $line =~ m/^\[[A-Z][a-z][a-z] ([A-Z][a-z][a-z]) ([0-9][0-9]) ([0-9][0-9]:[0-9][0-9]:[0-9][0-9])\S* ([0-9][0-9][0-9][0-9])\].* \[mod_rbld.c\] ([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+) is listed in (\w+)$/; my $tokout = {}; $tokout->{'timestamp'} = log2time($lineparts[0],$lineparts[1],$lineparts[3],$lineparts[2]); $tokout->{'short_message'} = $lineparts[4] . ' is listed in ' . $lineparts[5]; $tokout->{'_remote_addr'} = $lineparts[4]; $tokout->{'_bl'} = $lineparts[5]; $tokout->{'_facility'} = 'mod_rbld'; return $tokout; } # log2time(month,day,year,time) sub log2time { my @time = split(/:/, $_[3]); my $now; if ($TIMECACHE[0] eq "$_[0] $_[1] $time[0]") { $now = $TIMECACHE[1] + 60*$time[1] + $time[2]; if ($now < $TIMECACHE[2] + 3600 && $now >= $TIMECACHE[2]) { $TIMECACHE[2] = $now; return $now; } } my %months = ('Jan'=>0,'Feb'=>1,'Mar'=>2,'Apr'=>3,'May'=>4, 'Jun'=>5,'Jul'=>6,'Aug'=>7,'Sep'=>8,'Oct'=>9, 'Nov'=>10,'Dec'=>11); my $day = int($_[1]); $now = timelocal_nocheck( 0, 0, int($time[0]), $day, $months{$_[0]}, $_[2] - 1900); $TIMECACHE[0] = "$_[0] $_[1] $time[0]"; $TIMECACHE[1] = $now; $now = $now + $time[1]*60 + $time[2]; $TIMECACHE[2] = $now; return $now; } sub send_to_graylog { my $msg = shift; $msg->{'host'} = $HOSTNAME; $msg->{'version'} = '1.1'; $msg->{'_facility'} = 'modsecurity' unless($msg->{'_facility'}); my $json = encode_json($msg) . "\n"; if (!$GL_SOCKET || !$GL_SOCKET->connected) { $GL_SOCKET = new IO::Socket::INET ( PeerAddr => 'glog.eigbox.com', PeerPort => 12201, Proto => 'udp') or die("Cannot create socket!"); } $GL_SOCKET->send($json); } # https://2ip.io/as/8075/ - Microsoft ASN __DATA__ 1.186.0.0/16 Microsoft Limited Ripe 2023-10-30 2.58.103.0/24 mawa-dc-azure-westeurope Ripe 2022-12-11 4.144.0.0/12 Microsoft Corporation Arin 2019-10-04 4.160.0.0/12 Microsoft Corporation Arin 2020-01-06 4.176.0.0/12 Microsoft Corporation Arin 2020-03-26 4.192.0.0/12 Microsoft Corporation Arin 2020-07-07 4.208.0.0/12 Microsoft Corporation Arin 2020-10-07 4.224.0.0/12 Microsoft Corporation Arin 2021-01-06 4.240.0.0/12 Microsoft Corporation Arin 2021-04-06 5.23.34.0/24 GIGROUP_AZURE Ripe 2023-09-13 5.102.37.0/24 netname Ripe 2026-01-04 9.141.0.0/16 azure Ripe 2025-09-03 9.145.0.0/16 Microsoft Limited Ripe 2023-12-06 9.146.0.0/16 Microsoft Limited Ripe 2023-12-06 9.160.0.0/16 cloud Ripe 2025-09-05 9.163.0.0/16 cloud Ripe 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23.103.128.0/17 Microsoft Corporation Arin 2021-12-14 23.103.160.0/20 Microsoft Corporation Arin 2021-12-14 31.56.106.0/24 Private Customer Ripe 2025-02-12 31.58.221.0/24 Private Customer Ripe 2025-11-07 31.59.230.0/24 Private Customer Ripe 2025-11-07 37.228.121.0/24 Manage Now GmbH Ripe 2025-12-30 37.228.126.0/24 Manage Now GmbH Ripe 2025-12-30 40.47.0.0/16 Microsoft Corporation Arin 2023-09-29 40.64.0.0/15 Microsoft Corporation Arin 2021-12-14 40.66.0.0/17 Microsoft Corporation Arin 2021-12-14 40.67.0.0/16 Microsoft Corporation Arin 2021-12-14 40.68.0.0/14 Microsoft Corporation Arin 2021-12-14 40.74.0.0/15 Microsoft Corporation Arin 2021-12-14 40.76.0.0/14 Microsoft Corporation Arin 2021-12-14 40.80.0.0/12 Microsoft Corporation Arin 2021-12-14 40.95.86.0/23 Microsoft Corporation Arin 2021-12-14 40.95.238.0/23 Microsoft Corporation Arin 2021-12-14 40.96.0.0/13 Microsoft Corporation Arin 2021-12-14 40.104.0.0/14 Microsoft Corporation Arin 2021-12-14 40.104.0.0/15 Microsoft Corporation 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Ripe 2025-09-08 48.192.0.0/12 cloud Ripe 2025-09-05 48.208.0.0/13 cloud Ripe 2025-09-05 48.216.0.0/14 cloud Ripe 2025-09-05 48.220.0.0/15 Microsoft Limited Ripe 2025-12-29 48.222.0.0/15 Microsoft Limited Ripe 2025-12-29 50.85.0.0/16 Microsoft Limited Ripe 2024-04-03 50.117.58.0/24 Private Customer Arin 2025-10-31 50.117.87.0/24 Private Customer Arin 2025-11-06 51.1.0.0/16 Microsoft Limited Ripe 2024-05-08 51.4.0.0/15 cloud Ripe 2025-08-28 51.8.0.0/16 cloud Ripe 2025-08-28 51.10.0.0/15 cloud Ripe 2025-09-05 51.12.0.0/15 cloud Ripe 2025-09-05 51.42.0.0/16 Microsoft Limited Ripe 2024-05-08 51.51.0.0/16 cloud Ripe 2025-09-05 51.53.0.0/16 cloud Ripe 2025-09-05 51.56.0.0/14 Microsoft Limited Ripe 2024-05-08 51.103.0.0/16 cloud Ripe 2025-09-05 51.104.0.0/15 cloud Ripe 2025-09-05 51.107.0.0/16 cloud Ripe 2025-09-05 51.109.0.0/16 Microsoft Limited Ripe 2024-05-08 51.111.0.0/16 Microsoft Limited Ripe 2024-05-08 51.116.0.0/16 cloud Ripe 2025-09-05 51.120.0.0/16 cloud Ripe 2025-09-05 51.124.0.0/16 cloud Ripe 2025-09-05 51.126.0.0/16 Microsoft Limited Ripe 2024-05-08 51.132.0.0/16 cloud Ripe 2025-09-05 51.136.0.0/15 cloud Ripe 2025-09-05 51.138.0.0/16 cloud Ripe 2025-09-05 51.140.0.0/14 cloud Ripe 2025-09-05 51.144.0.0/15 cloud Ripe 2025-09-05 52.96.0.0/12 Microsoft Corporation Arin 2021-12-14 52.96.0.0/14 Microsoft Corporation Arin 2021-12-14 52.96.38.0/24 Microsoft Corporation Arin 2021-12-14 52.98.16.0/22 Microsoft Corporation Arin 2021-12-14 52.105.196.0/23 Microsoft Corporation Arin 2021-12-14 52.112.0.0/14 Microsoft Corporation Arin 2021-12-14 52.120.0.0/14 Microsoft Corporation Arin 2021-12-14 52.125.0.0/16 Microsoft Corporation Arin 2021-12-14 52.136.0.0/13 Microsoft Corporation Arin 2021-12-14 52.146.0.0/15 Microsoft Corporation Arin 2021-12-14 52.148.0.0/14 Microsoft Corporation Arin 2021-12-14 52.152.0.0/13 Microsoft Corporation Arin 2021-12-14 52.160.0.0/11 Microsoft Corporation Arin 2021-12-14 52.224.0.0/11 Microsoft Corporation Arin 2021-12-14 52.239.232.0/24 Microsoft Corporation Arin 2021-12-14 57.150.0.0/15 cloud Ripe 2025-09-05 57.152.0.0/14 cloud Ripe 2025-09-05 57.156.0.0/14 cloud Ripe 2025-09-05 57.160.0.0/12 Microsoft Limited Ripe 2022-08-01 62.12.56.0/24 Azure-West-Europe Ripe 2022-06-15 62.12.57.0/24 Azure-North-Europe Ripe 2022-06-15 62.12.58.0/24 Azure-East-US Ripe 2022-06-15 62.12.59.0/24 Azure-East-US-2 Ripe 2022-06-15 62.12.60.0/24 Azure-West-US Ripe 2022-06-28 62.12.61.0/24 Azure-West-US-2 Ripe 2022-06-15 62.97.228.0/24 NO-EVINY-20240130 Ripe 2024-01-30 62.132.26.0/23 KPN-BV Ripe 2025-11-27 62.164.204.0/23 Salling Group Net_17848 Ripe 2025-09-22 62.231.53.0/24 Azure-Infra Ripe 2025-08-19 63.116.158.0/24 Soroban Capital Partners LLC Arin 2023-12-20 64.4.0.0/18 Microsoft Corporation Arin 2021-12-14 64.5.116.0/24 MURPHY OIL USA, INC Arin 2025-11-14 64.13.130.0/24 EdgeConneX, INC Arin 2023-07-17 64.13.131.0/24 EdgeConneX, INC Arin 2024-10-09 64.15.23.0/24 PORTFOLIO RECOVERY ASSOCIATES Arin 2024-01-13 64.15.25.0/24 PORTFOLIO RECOVERY ASSOCIATES Arin 2024-01-13 64.40.128.0/24 Axon Enterprise, Inc Arin 2025-10-10 64.40.142.0/24 Axon Enterprise, Inc Arin 2025-10-10 64.40.143.0/24 Axon Enterprise, Inc Arin 2025-10-10 64.52.107.0/24 Evolve Security Arin 2025-08-21 64.72.206.0/24 ROX Systems Arin 2025-01-07 64.112.188.0/24 White Cap Construction Supply Arin 2026-03-11 64.236.0.0/16 cloud Ripe 2025-09-05 65.18.198.0/24 Fragomen, Del Rey, Bernsen & Loewy, LLP Arin 2026-03-24 65.52.0.0/14 Microsoft Corporation Arin 2021-12-14 66.9.47.0/24 Movement Mortgage Arin 2025-09-04 66.45.92.0/24 Vantage Bank Arin 2024-11-18 66.94.52.0/24 SILVER POINT CAPITAL, LP Arin 2025-03-20 66.94.53.0/24 SILVER POINT CAPITAL, LP Arin 2025-03-20 66.119.144.0/20 Microsoft Corporation Arin 2021-12-14 66.132.204.0/22 Skopos Financial LLC Arin 2024-06-15 66.178.148.0/24 NuWave Arin 2022-07-18 66.178.149.0/24 NuWave Arin 2022-07-18 66.185.137.0/24 GEICO Arin 2026-03-20 66.185.138.0/24 GEICO Arin 2026-03-20 66.185.139.0/24 GEICO Arin 2026-03-20 66.185.140.0/24 GEICO Arin 2026-03-20 66.185.141.0/24 GEICO Arin 2026-03-20 66.185.142.0/24 GEICO Arin 2026-03-20 66.235.159.0/24 Adobe Inc. 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OHG Ripe 2023-05-16 185.154.80.0/24 Linkedin Ripe 2022-06-17 185.154.81.0/24 Linkedin Ripe 2022-06-17 185.154.82.0/24 LinkedIn Ripe 2022-06-17 185.154.83.0/24 LinkedIn Ripe 2022-06-17 185.157.16.0/22 Zentura A/S Ripe 2025-01-06 185.187.104.0/24 Barsan_AZ1 Ripe 2024-01-18 185.187.105.0/24 Barsan_AZ2 Ripe 2023-09-18 185.187.123.0/24 XOVIS-NET-EU-AZ Ripe 2024-07-17 185.192.184.0/23 delaware-prd-01 Ripe 2025-02-27 185.195.244.0/24 VECOZO-SUB-1 Ripe 2023-03-06 185.195.245.0/24 North Europe Ripe 2023-03-06 185.209.208.0/24 FR-MAILINBLACK-20170622 Ripe 2022-05-19 185.209.209.0/24 FR-MAILINBLACK-20200211 Ripe 2022-05-24 185.211.208.0/24 -----BEGIN CERTIFICATE-----MIIDzTCCArWgAwIBAgIUCYGmIw5jN0xroPx0PJkNi6ZhQPowDQYJKoZIhvcNAQELBQAwdjELMAkGA1UEBhMCTkwxEDAOBgNVBAgMB1V0cmVjaHQxEzARBgNVBAcMCk5pZXV3ZWdlaW4xETAPBgNVBAoMCEFyeXphIE5MMRcwFQYDVQQLDA5JbmZyYXN0cnVjdHV1cjEUMBIGA1UEAwwLQVpVUkUtQllPSVAw Ripe 2023-04-14 185.222.140.0/22 ZD_INFRA Ripe 2023-08-14 185.236.221.0/24 BYOIP-NET221 Ripe 2023-09-25 185.238.165.0/24 Stichting Inlichtingenbureau Ripe 2026-01-27 185.242.137.0/24 PVCP_WEU_PIP Ripe 2023-10-24 185.242.139.0/24 PVCP_FRC_PIP Ripe 2023-03-23 188.94.190.0/24 Net & Com s.r.l. 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