#!/usr/bin/perl -w
##########################################################################
# $Id: mod_security2, v 1.0.1 2013/01/11
##########################################################################
#
# Revision 1.0.1   2013/01/11
# fixed problem with uninitialized values #6
#
##########################################################################
# This script is written an maintained by:
#   Torben Hansen <derhansen@gmail.com>
#
# To send comments, suggestions, bugreports, etc, please use:
#   https://github.com/derhansen/logwatch-modsec2
##########################################################################

##########################################################################
# Copyright © 2013 Torben Hansen <derhansen@gmail.com>
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the
# “Software”), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS
# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANT-
# ABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO
# EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
# DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
# OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
# THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#
##########################################################################

use Logwatch ':dates';

# Disable warnings about unused variables
no warnings qw(once);

my $Detail = $ENV{'LOGWATCH_DETAIL_LEVEL'} || 0;
my $Debug = $ENV{'LOGWATCH_DEBUG'} || 0;
my $SearchDate = TimeFilter('%d/%b/%Y:%H:%M:%S');
my $within_range = 0;

my %tmpEntry = ();
my $count = 0;

my %messages = ();
my %topips = ();
my %toprules = ();

my $check = 0;
my $option = '';

if ( $Debug >= 5 ) {
    print STDERR "\n\nDEBUG MODE \n\n";
}

# Initialize array
$tmpEntry{$count}{"action"} = "";
$tmpEntry{$count}{"hostname"} = "";
$tmpEntry{$count}{"message"} = "";
$tmpEntry{$count}{"ruleid"} = "";

while (defined($ThisLine = <STDIN>)) {
    chomp($ThisLine);

    # Reset $check if line starts with two dashes
    if ( $ThisLine =~ /-[A-Z]--/ ) {
        $check = 0;
        $option = "";
    }

    if ($check == 1) {
        if ($option eq "audit-log-header") {
            ($timestamp, $transactionID, $sourceIP, $sourcePort, $destIP, $destPort ) = ($ThisLine =~ /\[(.*?)\] (.*?) (.*?) (.*?) (.*?) (.*?)$/ );

            $tmpEntry{$count}{"timestamp"} = $timestamp;
            $tmpEntry{$count}{"sourceIp"} = $sourceIP;
            $tmpEntry{$count}{"sourcePort"} = $sourcePort;
            $tmpEntry{$count}{"destIp"} = $destIP;
            $tmpEntry{$count}{"destPort"} = $destPort;

            if ( $Debug >= 5 ) {
                print STDERR "\n";
                print STDERR "DATE: " . $timestamp . "\n";
                print STDERR "FROM: ". $sourceIP . ":" . $sourcePort . "\n";
                print STDERR "TO: ". $destIP . ":" . $destPort . "\n";
            }
        }

        if ($option eq "request-header") {
            if ( ($method, $requestUri) = ($ThisLine =~ /^(POST|GET) (.*?)$/) ) {
                $tmpEntry{$count}{"method"} = $method;
                $tmpEntry{$count}{"uri"} = $requestUri;

                if ( $Debug >= 5 ) {
                    print STDERR "METHOD: " . $method . "\n";
                    print STDERR "URI: " . $requestUri . "\n";
                }
            }
            elsif ( ($hostname) = ($ThisLine =~ /^Host: (.*?)$/) ) {
                $tmpEntry{$count}{"hostname"} = $hostname;

                if ( $Debug >= 5 ) {
                    print STDERR "HOST: " . $hostname . "\n";
                }
            }
        }
        if ($option eq "audit-log-trailer") {
            if ( $ThisLine =~ /^Message:/ ) {
                if ( ($ruleId) = ($ThisLine =~ /\[id \"(.*?)\"\]/) ) {
                    if ( $Debug >= 5 ) {
                        print STDERR "Rule ID: " . $ruleId. "\n";
                    }
                }
                if ( ($msg) = ($ThisLine =~ /\[msg \"(.*?)\"\]/) ) {
                    if ( $Debug >= 5 ) {
                        print STDERR "Message: " . $msg. "\n";
                    }
                }
                $tmpEntry{$count}{"ruleid"} = $ruleId;
                $tmpEntry{$count}{"message"} = $msg;
            }

            if ( ($action) = ($ThisLine =~ /^Action: (.*?)$/) ) {
                $tmpEntry{$count}{"action"} = $action;
                if ( $Debug >= 5 ) {
                    print STDERR "Action: " . $action. "\n";
                }
            }
            if ( ($engineMode) = ($ThisLine =~ /^Engine-Mode: (.*?)$/) ) {
                $tmpEntry{$count}{"engine"} = $engineMode;
                if ( $Debug >= 5 ) {
                    print STDERR "Engine mode: " . $engineMode. "\n";
                }
            }
        }
    }

    if ( $ThisLine =~ /-A--/ ) {
        $check = 1;
        $option = "audit-log-header";
    }
    elsif ( $ThisLine =~ /-B--/ ) {
        $check = 1;
        $option = "request-header";
    }
    elsif ( $ThisLine =~ /-H--/ ) {
        $check = 1;
        $option = "audit-log-trailer";
    }
    elsif ( $ThisLine =~ /-Z--/ ) {
        $check = 0;
        $option = "";

        # Create new summary entry if date matches searchdate
        if ( $tmpEntry{$count}{"timestamp"} =~ /$SearchDate/ ) {
            if (  $tmpEntry{$count}{"action"} ne "" && $tmpEntry{$count}{"hostname"} ne "" && $tmpEntry{$count}{"message"} ne "" && $tmpEntry{$count}{"ruleid"} ne "" ) {
                $messages{$tmpEntry{$count}{"hostname"}}{"numAttacks"}++;
                $messages{$tmpEntry{$count}{"hostname"}}{"attack"}{$tmpEntry{$count}{"sourceIp"}}{$tmpEntry{$count}{"ruleid"}} =  $tmpEntry{$count}{"message"};
                $messages{$tmpEntry{$count}{"hostname"}}{$tmpEntry{$count}{"sourceIp"}}{$tmpEntry{$count}{"ruleid"}}++;

                $topips{$tmpEntry{$count}{"sourceIp"}}++;
                $toprules{$tmpEntry{$count}{"ruleid"}}++;
            }
        }

        # Increase counter
        $count++;

        # Reset values
        $tmpEntry = ();
        $tmpEntry{$count}{"action"} = "";
        $tmpEntry{$count}{"hostname"} = "";
        $tmpEntry{$count}{"message"} = "";
        $tmpEntry{$count}{"ruleid"} = "";

        if ( $Debug >= 5 ) {
            print STDERR "---------------------------------------\n";
        }
    }
}

# Start summary
if (keys %messages) {
   print "\nATTACKS BLOCKED ON VHOSTS:\n";
   foreach my $vhost ( sort {$a cmp $b} keys %messages ) {
        print "\n" . $vhost . " - " . $messages{$vhost}{"numAttacks"} . " time(s)\n";

        foreach my $fromip (sort {$a cmp $b} keys %{$messages{$vhost}{"attack"}}) {
            foreach my $ruleid (sort {$a cmp $b} keys %{$messages{$vhost}{"attack"}{$fromip}}) {
                print "  [ip: " . sprintf("%-15s", $fromip) . "] ";
                print "[id: " . $ruleid . " ] [msg: " . $messages{$vhost}{"attack"}{$fromip}{$ruleid} . "] ";
                print " - " . $messages{$vhost}{$fromip}{$ruleid} . " time(s)\n";
            }
        }

   }
}

# Top 10 blocked IPs
if (keys %topips) {
   print "\nTOP 10 BLOCKED IPS:\n";
   my $cnt = 0;
   foreach my $ip ( sort {$topips{$b} <=> $topips{$a}} keys %topips ) {
        print "\n  " . sprintf("%2s", ($cnt + 1)) . ". " . $ip . " - " . $topips{$ip} . " time(s)";
        $cnt++;
        if($cnt == 10) { last(); }
   }
   print "\n";
}

exit(0)