###############################################################################
# Guardian.pl                                                                 #
###############################################################################
# YaBB: Yet another Bulletin Board                                            #
# Open-Source Community Software for Webmasters                               #
# Version:        YaBB 2.2                                                    #
# Packaged:       November 8, 2007                                            #
# Distributed by: http://www.yabbforum.com                                    #
# =========================================================================== #
# Copyright (c) 2000-2007 YaBB (www.yabbforum.com) - All Rights Reserved.     #
# Software by:  The YaBB Development Team                                     #
#               with assistance from the YaBB community.                      #
# Sponsored by: Xnull Internet Media, Inc. - http://www.ximinc.com            #
#               Your source for web hosting, web design, and domains.         #
###############################################################################

$guardianplver = 'YaBB 2.2 $Revision: 1.10 $';
if ($action eq 'detailedversion') { return 1; }


require "$vardir/Guardian.settings";
require "$vardir/Guardian.banned";

$not_from   = qq~$webmaster_email~;
$not_to     = qq~$webmaster_email~;
$abuse_time = &timeformat($date);
$abuse_time =~ s/\<sup\>\*\<\/sup\>/\*/g;

sub guard {
	if (!$use_guardian) { return; }

	# Proxy Blocker
	$proxy0 = &get_remote_addr;
	$proxy1 = &get_x_ip_client;
	$proxy2 = &get_x_forwarded;
	$proxy3 = &get_http_via;

	@white_list = split(/\|/, $whitelist);
	foreach (@white_list) {
		chomp $_;
		if (($proxy0 =~ m/$_/ || $proxy1 =~ m/$_/ || $proxy2 =~ m/$_/ || $proxy3 =~ m/$_/ || $username eq $_) && $_ ne "") { $whitelisted = 1; last; }
	}
	if ($disallow_proxy_on && !$whitelisted && !$iamadmin && ($proxy1 ne "empty" || $proxy2 ne "empty" || $proxy3 ne "empty")) {
		if ($disallow_proxy_notify) {
			&LoadLanguage('Guardian');
			$not_subject = qq~$guardian_txt{'main'}-($mbname): $guardian_txt{'proxy_abuse'} $guardian_txt{'abuse'}~;
			$not_body    = qq~$guardian_txt{'proxy_abuse'} $guardian_txt{'abuse'} $maintxt{'30'} $abuse_time\n\n~;
			$not_body .= qq~$guardian_txt{'abuse_user'}: $username -> ($realname)\n~;
			$not_body .= qq~$guardian_txt{'abuse_ip'}: (REMOTE_ADDR)->$proxy0, (X_IP_CLIENT)->$proxy1, (HTTP_X_FORWARDED_FOR)->$proxy2, (HTTP_VIA)->$proxy3\n~;
			if ($use_htaccess && $disallow_proxy_htaccess && !$iamadmin && !$iamgmod) {
				$not_body .= qq~$guardian_txt{'htaccess_added'}: $user_ip,\n\n~;
			}
			$not_body .= qq~$mbname, $guardian_txt{'main'}~;
			$not_subject =~ s~\&trade\;~~g;
			$not_body    =~ s~\&trade\;~~g;
			&guardian_notify($not_to, $not_subject, $not_body, $not_from);
		}
		if ($use_htaccess && $disallow_proxy_htaccess && !$iamadmin && !$iamgmod) {
			&update_htaccess("add", $user_ip);
		}
		&fatal_error("proxy_reason");
	}

	# Basic Value Setup
	$remote = &get_ip;
	if (index($remote, ", ")) {
		@remotes = split("\, ", $remote);
		if ($remotes[0] ne "unknown" && $remotes[0] ne "empty" && $remotes[0] ne "127.0.0.1" && $remotes[0] ne "") {
			$remote = $remotes[0];
		} else {
			$remote = $remotes[1];
		}
	}
	$querystring = &get_query_string;

	# Check for Referer
	if ($referer_on) {
		@refererlist = split(/\|/, lc($banned_referers));
		$streferer = lc(&get_referer);
		foreach (@refererlist) {
			chomp $_;
			if ($streferer =~ m/$_/ && $_ ne "") {
				&LoadLanguage('Guardian');
				if ($referer_notify) {
					$not_subject = qq~$guardian_txt{'main'}-($mbname): $guardian_txt{'referer_abuse'} $guardian_txt{'abuse'}~;
					$not_body    = qq~$guardian_txt{'referer_abuse'} $guardian_txt{'abuse'} $maintxt{'30'} $abuse_time\n\n~;
					$not_body .= qq~$guardian_txt{'abuse_user'}: $username -> ($realname)\n~;
					$not_body .= qq~$guardian_txt{'abuse_ip'}: $user_ip\n~;
					if ($use_htaccess && $referer_htaccess && !$iamadmin && !$iamgmod) {
						$not_body .= qq~$guardian_txt{'htaccess_added'}: $user_ip,\n~;
					}
					$not_body .= qq~$guardian_txt{'abuse_referer'}: $streferer\n\n~;
					$not_body .= qq~$mbname, $guardian_txt{'main'}~;
					$not_subject =~ s~\&trade\;~~g;
					$not_body    =~ s~\&trade\;~~g;
					&guardian_notify($not_to, $not_subject, $not_body, $not_from);
				}
				if ($use_htaccess && $referer_htaccess && !$iamadmin && !$iamgmod) {
					&update_htaccess("add", $user_ip);
				}
				&fatal_error("referer_reason");
			}
		}
	}

	# Check for Harvester
	if ($harvester_on) {
		@harvesterlist = split(/\|/, lc($banned_harvesters));
		$agent = lc(&get_user_agent);
		foreach (@harvesterlist) {
			chomp $_;
			if ($agent =~ m/$_/ && $_ ne "") {
				if ($harvester_notify) {
					&LoadLanguage('Guardian');
					$not_subject = qq~$guardian_txt{'main'}-($mbname): $guardian_txt{'harvester_abuse'} $guardian_txt{'abuse'}~;
					$not_body    = qq~$guardian_txt{'harvester_abuse'} $guardian_txt{'abuse'} $maintxt{'30'} $abuse_time\n\n~;
					$not_body .= qq~$guardian_txt{'abuse_user'}: $username -> ($realname)\n~;
					$not_body .= qq~$guardian_txt{'abuse_ip'}: $user_ip\n~;
					if ($use_htaccess && $harvester_htaccess && !$iamadmin && !$iamgmod) {
						$not_body .= qq~$guardian_txt{'htaccess_added'}: $user_ip,\n~;
					}
					$not_body .= qq~$guardian_txt{'abuse_harvester'}: $agent\n\n~;
					$not_body .= qq~$mbname, $guardian_txt{'main'}~;
					$not_subject =~ s~\&trade\;~~g;
					$not_body    =~ s~\&trade\;~~g; 
					&guardian_notify($not_to, $not_subject, $not_body, $not_from);
				}
				if ($use_htaccess && $harvester_htaccess && !$iamadmin && !$iamgmod) {
					&update_htaccess("add", $user_ip);
				}
				&fatal_error("harvester_reason");
			}
		}
	}

	# Check for Request
	if ($request_on) {
		@requestlist = split(/\|/, lc($banned_requests));
		$method = lc(&get_request_method);
		foreach (@requestlist) {
			chomp $_;
			if ($method =~ m/$_/ && $_ ne "") {
				if ($request_notify) {
					&LoadLanguage('Guardian');
					$not_subject = qq~$guardian_txt{'main'}-($mbname): $guardian_txt{'request_abuse'} $guardian_txt{'abuse'}~;
					$not_body    = qq~$guardian_txt{'request_abuse'} $guardian_txt{'abuse'} $maintxt{'30'} $abuse_time\n\n~;
					$not_body .= qq~$guardian_txt{'abuse_user'}: $username -> ($realname)\n~;
					$not_body .= qq~$guardian_txt{'abuse_ip'}: $user_ip\n~;
					if ($use_htaccess && $request_htaccess && !$iamadmin && !$iamgmod) {
						$not_body .= qq~$guardian_txt{'htaccess_added'}: $user_ip,\n~;
					}
					$not_body .= qq~$guardian_txt{'abuse_request'}: $method\n\n~;
					$not_body .= qq~$mbname, $guardian_txt{'main'}~;
					$not_subject =~ s~\&trade\;~~g;
					$not_body    =~ s~\&trade\;~~g;
					&guardian_notify($not_to, $not_subject, $not_body, $not_from);
				}
				if ($use_htaccess && $request_htaccess && !$iamadmin && !$iamgmod) {
					&update_htaccess("add", $user_ip);
				}
				&fatal_error("request_reason");
			}
		}
	}

	# Check for Strings
	if ($string_on) {
		@stringlist = split(/\|/, lc($banned_strings));
		foreach (@stringlist) {
			chomp $_;
			if (lc($querystring) =~ m/$_/ && $_ ne "") {
				if ($string_notify) {
					&LoadLanguage('Guardian');
					$not_subject = qq~$guardian_txt{'main'}-($mbname): $guardian_txt{'string_abuse'} $guardian_txt{'abuse'}~;
					$not_body    = qq~$guardian_txt{'string_abuse'} $guardian_txt{'abuse'} $maintxt{'30'} $abuse_time\n\n~;
					$not_body .= qq~$guardian_txt{'abuse_user'}: $username -> ($realname)\n~;
					$not_body .= qq~$guardian_txt{'abuse_ip'}: $user_ip\n~;
					if ($use_htaccess && $string_htaccess && !$iamadmin && !$iamgmod) {
						$not_body .= qq~$guardian_txt{'htaccess_added'}: $user_ip,\n~;
					}
					$not_body .= qq~$guardian_txt{'abuse_string'}: $_\n~;
					$not_body .= qq~$guardian_txt{'abuse_environment'}: $querystring\n\n~;
					$not_body .= qq~$mbname, $guardian_txt{'main'}~;
					$not_subject =~ s~\&trade\;~~g;
					$not_body    =~ s~\&trade\;~~g;
					&guardian_notify($not_to, $not_subject, $not_body, $not_from);
				}
				if ($use_htaccess && $string_htaccess && !$iamadmin && !$iamgmod) {
					&update_htaccess("add", $user_ip);
				}
				&fatal_error("string_reason","($_)");
			}
		}
	}

	# Check for UNION attack (for MySQL database protection only)
	if ($union_on) {
		if ($querystring =~ m/%20union%20/ || $querystring =~ m/\*\/union\/\*/) {
			if ($union_notify) {
				&LoadLanguage('Guardian');
				$not_subject = qq~$guardian_txt{'main'}-($mbname): $guardian_txt{'union_abuse'} $guardian_txt{'abuse'}~;
				$not_body    = qq~$guardian_txt{'union_abuse'} $guardian_txt{'abuse'} $maintxt{'30'} $abuse_time\n\n~;
				$not_body .= qq~$guardian_txt{'abuse_user'}: $username -> ($realname)\n~;
				$not_body .= qq~$guardian_txt{'abuse_ip'}: $user_ip\n~;
				if ($use_htaccess && $union_htaccess && !$iamadmin && !$iamgmod) {
					$not_body .= qq~$guardian_txt{'htaccess_added'}: $user_ip,\n~;
				}
				$not_body .= qq~$guardian_txt{'abuse_environment'}: $querystring\n\n~;
				$not_body .= qq~$mbname, $guardian_txt{'main'}~;
				$not_subject =~ s~\&trade\;~~g;
				$not_body    =~ s~\&trade\;~~g;
				&guardian_notify($not_to, $not_subject, $not_body, $not_from);
			}
			if ($use_htaccess && $union_htaccess && !$iamadmin && !$iamgmod) {
				&update_htaccess("add", $user_ip);
			}
			&fatal_error("union_reason");
		}
	}

	# Check for CLIKE attack (for MySQL database protection only)
	if ($clike_on) {
		if ($querystring =~ m/\/\*/) {
			if ($clike_notify) {
				&LoadLanguage('Guardian');
				$not_subject = qq~$guardian_txt{'main'}-($mbname): $guardian_txt{'clike_abuse'} $guardian_txt{'abuse'}~;
				$not_body    = qq~$guardian_txt{'clike_abuse'} $guardian_txt{'abuse'} $maintxt{'30'} $abuse_time\n\n~;
				$not_body .= qq~$guardian_txt{'abuse_user'}: $username -> ($realname)\n~;
				$not_body .= qq~$guardian_txt{'abuse_ip'}: $user_ip\n~;
				if ($use_htaccess && $clike_htaccess && !$iamadmin && !$iamgmod) {
					$not_body .= qq~$guardian_txt{'htaccess_added'}: $user_ip,\n~;
				}
				$not_body .= qq~$guardian_txt{'abuse_environment'}: $querystring\n\n~;
				$not_body .= qq~$mbname, $guardian_txt{'main'}~;
				$not_subject =~ s~\&trade\;~~g;
				$not_body    =~ s~\&trade\;~~g;
				&guardian_notify($not_to, $not_subject, $not_body, $not_from);
			}
			if ($use_htaccess && $clike_htaccess && !$iamadmin && !$iamgmod) {
				&update_htaccess("add", $user_ip);
			}
			&fatal_error("clike_reason");
		}
	}

	# Check for SCRIPTING attack
	if ($script_on) {
		while (($key, $secvalue) = each(%INFO)) {
			$secvalue = lc($secvalue);
			&str_replace("%3c", "<", $secvalue);
			&str_replace("%3e", ">", $secvalue);
			if (($secvalue =~ m/<[^>]script*\"?[^>]*>/) || ($secvalue =~ m/<[^>]*object*\"?[^>]*>/) || ($secvalue =~ m/<[^>]*iframe*\"?[^>]*>/) || ($secvalue =~ m/<[^>]*applet*\"?[^>]*>/) || ($secvalue =~ m/<[^>]*meta*\"?[^>]*>/) || ($secvalue =~ m/<[^>]*style*\"?[^>]*>/) || ($secvalue =~ m/<[^>]*form*\"?[^>]*>/) || ($secvalue =~ m/\([^>]*\"?[^)]*\)/) || ($secvalue =~ m/\"/)) {
				if ($script_notify) {
					&LoadLanguage('Guardian');
					$not_subject = qq~$guardian_txt{'main'}-($mbname): $guardian_txt{'script_abuse'} $guardian_txt{'abuse'}~;
					$not_body    = qq~$guardian_txt{'script_abuse'} $guardian_txt{'abuse'} $maintxt{'30'} $abuse_time\n\n~;
					$not_body .= qq~$guardian_txt{'abuse_user'}: $username -> ($realname)\n~;
					$not_body .= qq~$guardian_txt{'abuse_ip'}: $user_ip\n~;
					if ($use_htaccess && $script_htaccess && !$iamadmin && !$iamgmod) {
						$not_body .= qq~$guardian_txt{'htaccess_added'}: $user_ip,\n~;
					}
					$not_body .= qq~$guardian_txt{'abuse_url_environment'}: $secvalue\n\n~;
					$not_body .= qq~$mbname, $guardian_txt{'main'}~;
					$not_subject =~ s~\&trade\;~~g;
					$not_body    =~ s~\&trade\;~~g;
					&guardian_notify($not_to, $not_subject, $not_body, $not_from);
				}
				if ($use_htaccess && $script_htaccess && !$iamadmin && !$iamgmod) {
					&update_htaccess("add", $user_ip);
				}
				&fatal_error("script_reason");
			}
		}
		while (($key, $secvalue) = each(%FORM)) {
			$secvalue = lc($secvalue);
			&str_replace("%3c", "<", $secvalue);
			&str_replace("%3e", ">", $secvalue);
			if (($secvalue =~ m/<[^>]script*\"?[^>]*>/) || ($secvalue =~ m/<[^>]style*\"?[^>]*>/)) {
				if ($script_notify) {
					&LoadLanguage('Guardian');
					$not_subject = qq~$guardian_txt{'main'}-($mbname): $guardian_txt{'script_abuse'} $guardian_txt{'abuse'}~;
					$not_body    = qq~$guardian_txt{'script_abuse'} $guardian_txt{'abuse'} $maintxt{'30'} $abuse_time\n\n~;
					$not_body .= qq~$guardian_txt{'abuse_user'}: $username -> ($realname)\n~;
					$not_body .= qq~$guardian_txt{'abuse_ip'}: $user_ip\n~;
					if ($use_htaccess && $script_htaccess && !$iamadmin && !$iamgmod) {
						$not_body .= qq~$guardian_txt{'htaccess_added'}: $user_ip,\n~;
					}
					$not_body .= qq~$guardian_txt{'abuse_form_environment'}: $secvalue\n\n~;
					$not_body .= qq~$mbname, $guardian_txt{'main'}~;
					$not_subject =~ s~\&trade\;~~g;
					$not_body    =~ s~\&trade\;~~g;
					&guardian_notify($not_to, $not_subject, $not_body, $not_from);
				}
				if ($use_htaccess && $script_htaccess && !$iamadmin && !$iamgmod) {
					&update_htaccess("add", $user_ip);
				}
				&fatal_error("script_reason");
			}
		}
	}
	return;
}


sub guardian_notify {
	require "$sourcedir/Mailer.pl";
	my ($to, $subject, $body, $from) = @_;
	my $result = &sendmail($to, $subject, $body, $from);
}

sub get_remote_port {
	if ($ENV{'REMOTE_PORT'}) {
		return $ENV{'REMOTE_PORT'};
	} else {
		return "empty";
	}
}

sub get_request_method {
	if ($ENV{'REQUEST_METHOD'}) {
		return $ENV{'REQUEST_METHOD'};
	} else {
		return "empty";
	}
}

sub get_script_name {
	if ($ENV{'SCRIPT_NAME'}) {
		return $ENV{'SCRIPT_NAME'};
	} else {
		return "empty";
	}
}

sub get_http_host {
	if ($ENV{'HTTP_HOST'}) {
		return $ENV{'HTTP_HOST'};
	} else {
		return "empty";
	}
}

sub get_query_string {
	if ($ENV{'QUERY_STRING'}) {
		my $tempstring = &str_replace("%09", "%20", $ENV{'QUERY_STRING'});
		return &str_replace("%09", "%20", $ENV{'QUERY_STRING'});
	} else {
		return "empty";
	}
}

sub get_user_agent {
	if ($ENV{'HTTP_USER_AGENT'}) {
		return $ENV{'HTTP_USER_AGENT'};
	} else {
		return "empty";
	}
}

sub get_referer {
	if ($ENV{'HTTP_REFERER'}) {
		return $ENV{'HTTP_REFERER'};
	} else {
		return "empty";
	}
}

sub get_ip {
	$client_ip   = &get_client_ip;      ## HTTP_CLIENT_IP
	$x_forwarded = &get_x_forwarded;    ## HTTP_X_FORWARDED_FOR
	$x_ip_client = &get_x_ip_client;    ## X_IP_CLIENT
	$http_via    = &get_http_via;       ## HTTP_VIA
	$remote_addr = &get_remote_addr;    ## REMOTE_ADDR
	if ($client_ip && $client_ip !~ m/empty/ && $client_ip !~ m/unknown/) {
		return $client_ip;
	} elsif ($x_forwarded && $x_forwarded !~ m/empty/ && $x_forwarded !~ m/unknown/) {
		return $x_forwarded;
	} elsif ($x_ip_client && $x_ip_client !~ m/empty/ && $x_ip_client !~ m/unknown/) {
		return $x_ip_client;
	} elsif ($http_via && $http_via !~ m/empty/ && $http_via !~ m/unknown/) {
		return $http_via;
	} elsif ($remote_addr && $remote_addr !~ m/empty/ && $remote_addr !~ m/unknown/) {
		return $remote_addr;
	} else {
		return "empty";
	}
}

sub get_client_ip {
	if ($ENV{'HTTP_CLIENT_IP'} && $ENV{'HTTP_CLIENT_IP'} ne "127.0.0.1") {
		return $ENV{'HTTP_CLIENT_IP'};
	} else {
		return "empty";
	}
}

sub get_x_ip_client {
	if ($ENV{'X_CLIENT_IP'} && $ENV{'X_CLIENT_IP'} ne "127.0.0.1") {
		return $ENV{'X_CLIENT_IP'};
	} else {
		return "empty";
	}
}

sub get_http_via {
	if ($ENV{'HTTP_VIA'} && $ENV{'HTTP_VIA'} ne "127.0.0.1") {
		return $ENV{'HTTP_VIA'};
	} else {
		return "empty";
	}
}

sub get_x_forwarded {
	if ($ENV{'HTTP_X_FORWARDED_FOR'} && $ENV{'HTTP_X_FORWARDED_FOR'} ne "127.0.0.1") {
		return $ENV{'HTTP_X_FORWARDED_FOR'};
	} else {
		return "empty";
	}
}

sub get_remote_addr {
	if ($ENV{'REMOTE_ADDR'}) {
		return $ENV{'REMOTE_ADDR'};
	} else {
		return "empty";
	}
}

sub str_replace {
	my ($org, $repl, $target) = @_;
	$target =~ s~$org~$repl~ig;
	return $target;
}

sub update_htaccess {
	my ($action, @values) = @_;
	my ($htheader, $htfooter, @denies, @htout);
	if (!$action) { return 0; }
	fopen(HTA, ".htaccess");
	@htlines = <HTA>;
	fclose(HTA);

	# header to determine only who has access to the main script, not the admin script
	$htheader = qq~<Files YaBB*>~;
	$htfooter .= qq~</Files>~;
	$start = 0;
	foreach (@htlines) {
		chomp $_;
		if ($_ eq $htheader){$start = 1;}
		if ($start == 0 && !($_ =~ m/\#/) && $_ ne ""){push(@htout, "$_\n");}
		if ($_ eq $htfooter){$start = 0;}
		if ($_ =~ m/Deny from / && $start == 1) {
			$_ =~ s~Deny from ~~g;
			push(@denies, $_);
		}
	}
	if (($action eq "add" || $action eq "remove") && $use_htaccess) {
		$mylastdate = &timeformat($date, 1);
		fopen(HTA, ">.htaccess");
		print HTA "# Last modified by The Guardian: $mylastdate GMT #\n\n";
		print HTA @htout;
		if($values[0] ne ""){
			print HTA "$htheader\n";
			foreach (@denies) {
				chomp $_;
				chomp $values[0];
				if ($_ ne $values[0]) { print HTA "Deny from $_\n"; }
			}
			if ($action eq "add") { print HTA "Deny from $values[0]\n"; }
			print HTA "$htfooter\n";
		}
		fclose(HTA);
	}
}

1;
