488 lines
13 KiB
Perl
488 lines
13 KiB
Perl
#!/usr/bin/perl
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###############################################################################
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# Passive collector
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###############################################################################
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use NetAddr::IP;
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# Define variables
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my %months = ('Jan' => 1, 'Feb' => 2, 'Mar' => 3, 'Apr' => 4, 'May' => 5, 'Jun' => 6,
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'Jul' => 7, 'Aug' => 8, 'Sep' => 9, 'Oct' => 10, 'Nov' => 11, 'Dec' => 12);
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##########
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## INFO ##
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##########
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# WHEN SPLIT A LOGFILE LINE, THIS IS THE RESULT
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# Hour: $packages[3]
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# Date: $packages[2]-$packages[1]-$packages[4]
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# Protocol: $packages[5]
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# Interface: $packages[6]
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# Bytes: $packages[7]
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# From: $packages[10] (Format -> IP:Port)
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# To: $packages[12] (Format -> IP:Port)
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# Info: All after $packages[12] ('To')
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# Main code
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check_root();
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# Load config file from command line or show help
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help_screen () if ($#ARGV < 0 || $ARGV[0] =~ m/--*h/i);
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my $conf_file = $ARGV[0];
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if(!-e $conf_file) {
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print "[ERROR] Configuration file $conf_file not exists.\n\n";
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exit;
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}
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help_screen () if ($ARGV[1] =~ m/--*h/i);
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my $config = load_config($conf_file);
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passive_collector_main($config);
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##############################################################################
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# Print a help screen and exit.
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##############################################################################
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sub help_screen{
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print "Usage: $0 <path to collector.conf> [<options>]\n\n";
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print "Available options:\n";
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print "\t-h: Display help\n\n";
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exit;
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}
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##########################################################################
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# Write a data XML on pandora incoming dir
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##########################################################################
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sub writexml($$$) {
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my ($ip, $xmlmessage, $config) = @_;
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my $hostname = "IP_".$ip;
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my $interval = $config->{'interval'};
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my $file = $config->{'incomingdir'}.$hostname.".".time().".data";
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open (FILEXML, ">> $file") or die "[FATAL] Cannot write to XML '$file'";
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print FILEXML "<agent_data interval='$interval' os_name='Network' os_vesion='3.2' version='N/A' timestamp='AUTO' address='$ip' agent_name='$hostname'>\n";
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print FILEXML $xmlmessage;
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print FILEXML "</agent_data>";
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close (FILEXML);
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}
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##########################################################################
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# Add module info to XML passed
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##########################################################################
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sub add_module_to_xml($$$$) {
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my ($config, $module_name, $description, $data) = @_;
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my $xml = "<module>\n";
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$xml .= "<name>$module_name</name>\n";
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$xml .= "<type>async_data</type>\n";
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$xml .= "<description>$description</description>\n";
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$xml .= "<interval>".$config->{'interval'}."</interval>\n";
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$xml .= "<data>$data</data>\n";
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$xml .= "</module>\n";
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return $xml;
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}
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################################################################################
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# Load config file parameters
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################################################################################
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sub load_config ($) {
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my $config_file = shift;
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my $interface;
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my @process_rules;
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my @discard_rules;
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my %config;
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open (FILE, $config_file);
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while (<FILE>) {
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my ($line) = split("\t");
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if($line =~ /^iface/) {
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$config{'interface'} = (split(' ', $line))[1];
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}
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elsif($line =~ /^log_path/) {
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$config{'log_path'} = (split(' ', $line))[1];
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}
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elsif($line =~ /^process/) {
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push(@process_rules, $line);
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}
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elsif($line =~ /^discard/) {
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push(@discard_rules, $line);
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}
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elsif($line =~ /^interval/) {
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$config{'interval'} = (split(' ', $line))[1];
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}
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elsif($line =~ /^incomingdir/) {
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$config{'incomingdir'} = (split(' ', $line))[1];
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}
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elsif($line =~ /^min_size/) {
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$config{'min_size'} = (split(' ', $line))[1];
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}
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}
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$config{'process_rules'} = \@process_rules;
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$config{'discard_rules'} = \@discard_rules;
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return \%config;
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}
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################################################################################
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# Check if the script is running with root privileges
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################################################################################
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sub check_root () {
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if ($> != 0) {
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print "\nThis program can be run only by the system administrator\n\n";
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exit
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}
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}
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################################################################################
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# Check the rules with specific source and destination IPs and PORTs.
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################################################################################
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sub check_rules ($$$$) {
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my ($from_addr, $to_addr, $protocol, $rules_info) = @_;
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my @from = split(':',$from_addr);
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my @to = split(':',$to_addr);
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my @rules_info = @{$rules_info};
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my %success_info;
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$success_info{'success'} = 0;
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for(my $i = 0; $i <= $#rules_info; $i++) {
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if(@rules_info[$i]->{'ip_side'} eq 'src') {
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$success_info{'match_ip'} = $from[0];
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$success_info{'other_ip'} = $to[0];
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}
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else {
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$success_info{'match_ip'} = $to[0];
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$success_info{'other_ip'} = $from[0];
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}
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if(@rules_info[$i]->{'port_side'} eq 'src') {
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$success_info{'match_port'} = $from[1];
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}
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else {
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$success_info{'match_port'} = $to[1];
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}
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# If the port is not specified we set wilcard as port
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if($success_info{'match_port'} eq '') {
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$success_info{'match_port'} = "*";
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}
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$success_info{'protocol'} = $protocol;
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my $ip_found = 0;
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# Check if the address match with the rule
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if($success_info{'match_ip'} =~ @rules_info[$i]->{'addrs_re'}) {
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$ip_found = 1;
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}
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my $port_found = 0;
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# Check if the port exists in the hash table
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if(defined($rules_info[$i]->{'ports'}->{$uccess_info{'match_port'}})) {
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$port_found = 1;
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}
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my $protocol_found = 0;
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# Check if the protocol exists in the hash table or is all
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if(defined($rules_info[$i]->{'protocols'}->{$success_info{'protocol'}}) || defined($rules_info[$i]->{'protocols'}->{'all'})) {
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$protocol_found = 1;
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}
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# If found and negative or not found and possitive are the bad combinations
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# The results cant be 1
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$ip_success = $rules_info[$i]->{'ip_sign'} + $ip_found;
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$port_success = $rules_info[$i]->{'port_sign'} + $port_found;
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$protocol_success = $rules_info[$i]->{'protocol_sign'} + $protocol_found;
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if($ip_success == 1 || $port_success == 1 || $protocol_success == 1) {
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next;
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}
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else {
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if($rules_info[$i]->{'rule_type'} eq 'process') {
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$success_info{'success'} = 1;
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}
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else {
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$success_info{'success'} = 0;
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}
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last;
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}
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}
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return \%success_info;
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}
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################################################################################
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# Parse rules and return a data structure with the rules parameters.
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################################################################################
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sub parse_rules ($) {
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my $rules = shift;
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my @rules = @{$rules};
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my @rules_info;
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for(my $i = 0; $i <= $#rules; $i++) {
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@rules_info[$i] = $rules[$i];
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my @rule_parts = split(" ", $rules[$i]);
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my $net_addr = new NetAddr::IP ($rule_parts[2]);
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@rules_info[$i]->{'addrs_re'} = $net_addr->re();
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my %ports;
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my @ports_enumeration = split(",", $rule_parts[4]);
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for(my $i = 0; $i<=$#ports_enumeration; $i++) {
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my @ports_interval = split("-", $ports_enumeration[$i]);
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# If the format is [port1]-[port2] we store the interval
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if($#ports_interval == 1) {
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for(my $j = $ports_interval[0]; $j<=$ports_interval[1]; $j++) {
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$ports{$j} = 1;
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}
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}
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else {
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# If the format is not interval, is single port
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$ports{$ports_enumeration[$i]} = 1;
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}
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}
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@rules_info[$i]->{'ports'} = \%ports;
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my %protocols;
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my @protocols_enumeration = split(",", $rule_parts[6]);
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for(my $i = 0; $i<=$#protocols_enumeration; $i++) {
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$protocols{$protocols_enumeration[$i]} = 1;
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}
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@rules_info[$i]->{'protocols'} = \%protocols;
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# SIGN OF THE IP RULE #
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#0 if the ip rule is negate, 1 if not
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if($rule_parts[1] =~ /^!.*/) {
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@rules_info[$i]->{'ip_sign'} = 0;
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}
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else {
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@rules_info[$i]->{'ip_sign'} = 1;
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}
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# SIGN OF THE SIDE OF THE IP RULE #
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#src for source; dst for destination
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if($rule_parts[1] =~ /(!)*src.*/) {
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$ip_side = 'src';
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@rules_info[$i]->{'ip_side'} = 'src';
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}
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else {
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$ip_side = 'dst';
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@rules_info[$i]->{'ip_side'} = 'dst';
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}
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# SIGN OF THE PORT RULE #
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#0 if the port rule is negate, 1 if not
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if($rule_parts[3] =~ /^!.*/) {
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@rules_info[$i]->{'port_sign'} = 0;
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}
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else {
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@rules_info[$i]->{'port_sign'} = 1;
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}
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# SIGN OF THE SIDE OF THE PORT RULE #
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#src for source; dst for destination
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if($rule_parts[3] =~ /(!)*src.*/) {
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@rules_info[$i]->{'port_side'} = 'src';
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}
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else {
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@rules_info[$i]->{'port_side'} = 'dst';
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}
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# SIGN OF THE PROTOCOL RULE #
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#0 if the protocol rule is negate, 1 if not
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if($rule_parts[5] =~ /^!.*/) {
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@rules_info[$i]->{'protocol_sign'} = 0;
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}
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else {
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@rules_info[$i]->{'protocol_sign'} = 1;
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}
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# TYPE OF THE RULE #
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#'process' for store the matches and 'discard' for avoid it
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@rules_info[$i]->{'rule_type'} = $rule_parts[0];
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}
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return \@rules_info;
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}
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##########################################################################
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## Main function
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##########################################################################
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sub passive_collector_main ($) {
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my ($config) = @_;
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my $log_path = $config->{'log_path'};
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my %tree;
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my $start_date;
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my $start_hour;
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my @rules = (@{$config->{'discard_rules'}}, @{$config->{'process_rules'}});
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###################
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# PARSE THE RULES #
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###################
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my @rules_info = @{parse_rules(\@rules)};
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##################
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# PARSE THE FILE #
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##################
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open (FILE, $log_path);
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my $descarted1 = 0;
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my $descarted2 = 0;
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my $descarted3 = 0;
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my $processed = 0;
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my $superprocessed = 0;
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while (<FILE>) {
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my ($line) = split("\t");
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# Keep the original line to future changes
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$orig_line = $line;
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# Remove ; from the line
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$line =~ s/;//g;
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# Split the line into array
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my @packages = split(" ", $line);
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# Get the numeric month
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$packages[1] = $months{$packages[1]};
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#######################
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# CHECK SPECIAL CASES #
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#######################
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# The first line of the execution is a header with the start date and hour
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if($packages[5] eq '********') {
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$start_date = "$packages[2]-$packages[1]-$packages[4]";
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$start_hour = $packages[3];
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next;
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}
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# Special case with the 'Connection' script in the interface place
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# has a different structure. Discard this case.
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my $from_addr;
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my $to_addr;
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my $info;
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# Get the substring from the clean line after the destination to keep the extra info
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if ( $orig_line =~ /$packages[12];\s(.*?)\n/ )
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{
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$info = $1;
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}
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# Discard the ACKs and other Synchronization packages
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if ($info =~ /FIN/ || $info =~ /SYN/ || $info =~ /reset/) {
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next;
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}
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# Discard the connections tries
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if($packages[6] eq 'Connection') {
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next;
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}
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# Check the min size to discard little packages
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if($config->{'min_size'} > $packages[7]) {
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next;
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}
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# Store the Addresses
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$from_addr = $packages[10];
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$to_addr = $packages[12];
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$protocol = $packages[5];
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###################
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# CHECK THE RULES #
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###################
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my %success_info = %{check_rules($from_addr, $to_addr, $protocol, \@rules_info)};
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if($success_info{'success'} == 0) {
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next;
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}
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######################
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# STORE THE PACKAGES #
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######################
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$tree{$success_info{'match_ip'}}[0]->{$success_info{'match_port'}}->{'total'} += $packages[7];
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$tree{$success_info{'match_ip'}}[0]->{$success_info{'match_port'}}->{$success_info{'protocol'}} += $packages[7];
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$tree{$success_info{'match_ip'}}[1]->{$success_info{'other_ip'}}->{'total'} += $packages[7];
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$tree{$success_info{'match_ip'}}[1]->{$success_info{'other_ip'}}->{$success_info{'match_port'}} += $packages[7];
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$tree{$success_info{'match_ip'}}[2]->{$success_info{'protocol'}}->{'total'} += $packages[7];
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# Registers counter
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$tree{$success_info{'match_ip'}}[3] ++;
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# Total Bytes
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$tree{$success_info{'match_ip'}}[4] += $packages[7];
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}
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close(FILE);
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##########################################
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# BUILD XML AND WRITE IT #
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##########################################
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my $total_bytes = 0;
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my $total_regs = 0;
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my $total_ips = 0;
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foreach $k (keys (%tree))
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{
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my $xmlmessage = '';
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foreach $i (keys (%{$tree{$k}[0]}))
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{
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$xmlmessage .= add_module_to_xml ($config, "Port_".$i, "Total bytes of port ".$i, $tree{$k}[0]->{$i}->{'total'});
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foreach $j (keys (%{$tree{$k}[0]->{$i}}))
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{
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if($j eq 'total') {
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next;
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}
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$xmlmessage .= add_module_to_xml ($config, "Port_".$i."_Protocol_".$j, "Total bytes of port ".$i." for protocol ".$j, $tree{$k}[0]->{$i}->{$j});
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}
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}
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foreach $i (keys (%{$tree{$k}[1]}))
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{
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$xmlmessage .= add_module_to_xml ($config, "IP_".$i, "Total bytes of IP ".$i, $tree{$k}[1]->{$i}->{'total'});
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foreach $j (keys (%{$tree{$k}[1]->{$i}}))
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{
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if($j eq 'total') {
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next;
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}
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$xmlmessage .= add_module_to_xml ($config, "IP_".$i."_Port_".$j, "Total bytes of IP ".$i." for port ".$j, $tree{$k}[1]->{$i}->{$j});
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}
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}
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foreach $i (keys (%{$tree{$k}[2]}))
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{
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$xmlmessage .= add_module_to_xml ($config, "Protocol_".$i, "Total bytes of Protocol ".$i, $tree{$k}[2]->{$i}->{'total'});
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}
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# Store statistics in the future
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$total_regs += $tree{$k}[3];
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$total_bytes += $tree{$k}[4];
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$total_ips ++;
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writexml($k, $xmlmessage, $config);
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}
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}
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