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uif.pl
executable file
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uif.pl
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#!/usr/bin/perl -w
# Copyright (C) 2002-2015 Jörg Platte <[email protected]>
# Copyright (C) 2002-2015 Cajus Pollmeier <[email protected]>
# Copyright (C) 2013-2015 Alex Owen <[email protected]>
# Copyright (C) 2013-2022 Mike Gabriel <[email protected]>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
use strict;
my $LDAPENABLED = eval "use Net::LDAP; 1" ? '1' : '0';
use Getopt::Std;
use NetAddr::IP;
use Data::Validate::IP qw(is_ipv6 is_ipv4);
use Socket qw(:addrinfo SOCK_RAW AF_INET AF_INET6);
my $SignalCatched=0;
my $configfile="/etc/uif/uif.conf";
my $configfile6="/etc/uif/uif6.conf";
my $ipv6=0;
my @icmpv6_types_mapping = ( [ 'neighbor-advertisement', 'nd-neighbor-advert' ],
[ 'neighbour-advertisement', 'nd-neighbor-advert' ],
[ 'neighbor-solicitation', 'nd-neighbor-solicit' ],
[ 'neighbour-solicitation', 'nd-neighbor-solicit' ],
[ 'router-advertisement', 'nd-router-advert' ],
[ 'router-solicitation', 'nd-router-solicit' ]);
my @mapping = ( [ 'n', 'uifid', 'Name' ],
[ 's', 'uifsource', 'Source'],
[ 'i', 'uifindevice', 'InputInterface'],
[ 'd', 'uifdest', 'Destination'],
[ 'o', 'uifoutdevice', 'OutputInterface'],
[ 'p', 'uifservice', 'Service'],
[ 'm', 'uifmark', 'MarkMatch'],
[ 'S', 'uiftranssource', 'TranslatedSource'],
[ 'D', 'uiftransdest', 'TranslatedDestination'],
[ 'P', 'uiftransservice', 'TranslatedService'],
[ '', 'uiftype', 'Type'],
[ 'f', 'uifflag', 'Flags'],
# only supported with old iptables backend... deprecated with nftables
# FIXME: disable these options in the uif.conf parser code at some point
[ 'pi', 'uifpindevice', 'PhysicalInputInterface'],
[ 'po', 'uifpoutdevice', 'PhysicalOutputInterface']);
my %charstringmap;
my %ldapstringmap;
my %ldapwritemap;
my %stringcharmap;
foreach (@mapping) {
$charstringmap{${$_}[0]}=${$_}[2];
$stringcharmap{${$_}[2]}=${$_}[0];
if (${$_}[0]) {
$ldapstringmap{${$_}[1]}=${$_}[2];
}
$ldapwritemap{${$_}[2]}=${$_}[1];
}
sub readConfig {
my ($configfile, $Networks, $Services, $Interfaces, $Protocols, $Rules, $Id, $Sysconfig, $Marker) = @_;
my @conflines;
my @protlines;
my $state='NONE';
my $line;
unless (defined($$Protocols{'OK'})) {
$$Protocols{'OK'}=1;
open (PROT, '/etc/protocols') || die "Can't read '/etc/protocols'\n";
@protlines = <PROT>;
close (PROT);
foreach $line (@protlines) {
if ($line =~ /^\s*(#|$)/) {
next;
}
chomp($line);
if ($line =~ /^([a-z0-9-.]+)\s+(\d+)\s+/) {
$$Protocols{$1}=$2;
$$Protocols{$2}=$1;
} else {
die "invalid line in '/etc/protocols': $line\n";
}
}
}
open (CONF, $configfile) || die "Can't read configfile '$configfile'\n";
@conflines = <CONF>;
close (CONF);
foreach $line (@conflines) {
$line =~ /^\s*(#|$)/ && next;
chomp($line);
if ($state eq 'NONE') {
my $type;
if ($line =~ /^\s*([^\s}]+)\s*{\s*$/) {
$state="\U$1";
} else {
die "invalid line: $line\n";
}
} else {
if ($line =~ /^\s*}\s*$/) {
$state='NONE';
} elsif ($state eq 'SERVICE') {
if ($line =~ /^\s*([a-zA-Z0-9_-]+)\s+(.*)$/) {
$$Services{$1}.="$2 ";
} else {
die "invalid line in section service: $line\n";
}
} elsif ($state eq 'INCLUDE') {
if ($line =~ /^\s*\"(.+)\"$/) {
my $filename_pattern = $1;
my @filenames = glob($filename_pattern);
my $file;
foreach $file(@filenames) {
readConfig ($file, $Networks, $Services, $Interfaces, $Protocols, $Rules, $Id, $Sysconfig);
}
} else {
die "invalid line in section include: $line\n";
}
} elsif ($state eq 'INCLUDE6') {
if ($ipv6) {
if ($line =~ /^\s*\"(.+)\"$/) {
my $filename_pattern = $1;
my @filenames = glob($filename_pattern);
my $file;
foreach $file(@filenames) {
readConfig ($file, $Networks, $Services, $Interfaces, $Protocols, $Rules, $Id, $Sysconfig);
}
} else {
die "invalid line in section include6: $line\n";
}
}
} elsif ($state eq 'INCLUDE4') {
if ($ipv6) {} else {
if ($line =~ /^\s*\"(.+)\"$/) {
my $filename_pattern = $1;
my @filenames = glob($filename_pattern);
my $file;
foreach $file(@filenames) {
readConfig ($file, $Networks, $Services, $Interfaces, $Protocols, $Rules, $Id, $Sysconfig);
}
} else {
die "invalid line in section include4: $line\n";
}
}
} elsif ($state eq 'NETWORK') {
if ($line =~ /^\s*([a-zA-Z0-9_-]+)\s+(.*)$/) {
$$Networks{$1}.="$2 ";
} else {
die "invalid line in section network: $line\n";
}
} elsif ($state eq 'INTERFACE') {
if ($line =~ /^\s*([a-zA-Z0-9_-]+(:\d+)?)\s+(.*)$/) {
$$Interfaces{$1}.="$3 ";
} else {
die "invalid line in section interface: $line\n";
}
} elsif ($state eq 'MARKER') {
if ($line =~ /^\s*([a-zA-Z0-9_-]+)\s+(.*)$/) {
$$Marker{$1}.="$2 ";
} else {
die "invalid line in section marker: $line\n";
}
} elsif ($state eq 'SYSCONFIG') {
if ($line =~ /^\s*([a-zA-Z0-9_-]+)\s+(.*)$/) {
$$Sysconfig{$1}=$2;
} else {
die "invalid line in section sysconfig: $line\n";
}
} elsif ($state =~ /^(FILTER|NAT|INPUT|OUTPUT|FORWARD|MASQUERADE|STATELESS)$/) {
if ($line =~ /^\s*(\w+([-+|>]|{\w+}))\s*(.*)$/) {
my $type = $1;
my $parameter = $3;
my %temphash;
$temphash{'Type'}=$type;
$temphash{'Rule'}=$line;
$temphash{'Id'}=$$Id++;
my $entry;
foreach $entry (split(/\s+/, $parameter)) {
$entry eq '' && next;
if ($entry =~ /^([a-zA-Z]{1,2})=([^=]+)$/) {
if (exists($charstringmap{$1})) {
my $value = $2;
$value =~ tr /,/ /;
$temphash{$charstringmap{$1}}.="$value ";
} else {
die "invalid prefix: $1\n";
}
} else {
die "invalid parameter: $entry\n";
}
}
push (@$Rules, \%temphash);
} else {
die "invalid line in section filter/nat: $line\n"
}
} else {
die "invalid section: \L$state\n";
}
}
}
}
sub resolveHashentries {
my ($value, $Hash, $depth) = @_;
unless (defined($depth)) {
$depth=1;
} elsif ($depth++ > 50) {
die "possible loop in configfile: $value\n";
}
my $newvalue;
my $entry;
foreach $entry (split (/\s+/, $value)) {
$entry eq '' && next;
if (exists($$Hash{$entry})) {
$newvalue.=" ".resolveHashentries($$Hash{$entry}, $Hash, $depth);
} else {
$newvalue.=" ".$entry;
}
}
return $newvalue;
}
sub expandRange {
my ($range, $multi) = @_;
if (@$range != 0) {
unless (@$multi == 0 && @$range==1) {
my %rangehash;
my @rangearray;
my $entry;
foreach $entry (@$range) {
$entry =~ /(\d+):(\d+)/;
my $range=$2-$1+1;
if (exists($rangehash{$range})) {
push (@{$rangehash{$range}}, $1);
} else {
$rangehash{$range}=[$1];
}
push (@rangearray, $range);
}
@rangearray=sort {$a <=> $b} (@rangearray);
my $again=1;
my $last=15;
while ($again) {
$again=0;
while (@rangearray) {
my $range=$rangearray[0];
if (@$multi+$range<=$last) {
my $first=shift(@{$rangehash{$range}});
my $port;
for ($port=$first+$range-1; $port>=$first; $port--) {
push (@$multi, $port);
}
shift (@rangearray);
} else {
last;
}
}
if (@rangearray>1) {
$last+=15;
if (@$multi+$rangearray[0]+$rangearray[1]<=$last) {
$again=1;
}
}
}
my @temprange;
foreach $range (@rangearray) {
foreach (@{$rangehash{$range}}) {
my $last=$_+$range-1;
push(@temprange, "$_:$last");
}
}
@$range=@temprange;
}
}
}
sub simplifyNetworks {
my (@networks) = @_;
my @netobjects;
my $netref;
my %macs;
my $mac;
my $network;
if (@networks) {
my $ip;
my $no_macs=1;
foreach (@networks) {
my $netaddr = '';
my $network = '';
my $macaddr = '';
if ( ($_ =~ /(^[^\/]+)\/([^\/^=]+)$/) || (($ipv6) && is_ipv6($_)) || ((!$ipv6) && is_ipv4($_)) ) {
if ($ipv6) {
$ip=NetAddr::IP->new6($_) || die "not a valid address or network: $_\n";
} else {
$ip=NetAddr::IP->new($_) || die "not a valid address or network: $_\n";
}
push(@netobjects, $ip);
}
elsif ( $_ =~ /(^[^=]+)=([^=]+)$/ ) {
$netaddr = $1;
$macaddr = $2;
if ($netaddr =~ /(^[^\/]+)\/([^\/]+)$/) {
$network = $1;
# FIXME: netmask = $2; TODO: validate netmask
} else {
$network = $netaddr;
}
if ( (($ipv6) && is_ipv6($network)) || ((!$ipv6) && is_ipv4($network)) ) {
if ($ipv6) {
$ip=NetAddr::IP->new6($netaddr) || die "not a valid address or network: $netaddr\n";
} else {
$ip=NetAddr::IP->new($netaddr) || die "not a valid address or network: $netaddr\n";
}
if (!exists($macs{$ip})) {
$macs{$ip}=[];
}
$no_macs = 0;
push (@{$macs{$ip}}, $macaddr);
push (@netobjects, $ip);
} else {
die "Cannot use <dns-name>=<mac-addr> syntax, must be <network-or-ip-addr>=<mac-addr>"
}
}
else {
# resolv "address" that actually is a DNS host name, not an IP address...
my $err;
my @res;
if ($ipv6) {
( $err, @res ) = getaddrinfo( $_, "", { socktype => SOCK_RAW, family => AF_INET6 } );
} else {
( $err, @res ) = getaddrinfo( $_, "", { socktype => SOCK_RAW, family => AF_INET } );
}
die "Cannot getaddrinfo for name '".$_."'- ".$err if $err;
while ( my $ai = shift @res ) {
my ( $err, $ipaddr ) = getnameinfo( $ai->{addr}, NI_NUMERICHOST, NIx_NOSERV );
die "Cannot getnameinfo - $err" if $err;
if ($ipv6) {
$ip=NetAddr::IP->new6($ipaddr) || die "not a valid address: $ipaddr\n";
} else {
$ip=NetAddr::IP->new($ipaddr) || die "not a valid address: $ipaddr\n";
}
push (@netobjects, $ip);
}
}
}
# if we don't handle individual MAC addresses on any of the networks, then
# we can compact the list of networks
if ($no_macs == 1) {
@netobjects = NetAddr::IP::Compact(@netobjects);
}
@networks=();
foreach $network (@netobjects) {
if (exists($macs{$network})) {
foreach $mac (@{$macs{$network}}) {
push (@networks, $network."=".$mac);
}
}
else {
push (@networks, $network);
}
}
}
return (@networks);
}
sub checkLimit {
my ($limit) = @_;
if ($limit =~/^\d+(\/second|\/minute|\/hour|\/day|)$/) {
return 1;
} else {
return 0;
}
}
sub validateSysconfig {
my ($Sysconfig) = @_;
my $syskey;
foreach $syskey (keys (%$Sysconfig)) {
if ("\L$syskey" eq "loglevel") {
my $level=$$Sysconfig{$syskey};
delete $$Sysconfig{$syskey};
$level =~ s/\s+//g;
if ($level =~/^(debug|info|notice|warning|err|crit|alert|emerg)$/) {
$$Sysconfig{'LogLevel'}=$level;
} else {
die "unknown loglevel: $level\n";
}
} elsif ("\L$syskey" eq "logprefix") {
my $prefix=$$Sysconfig{$syskey};
delete $$Sysconfig{$syskey};
$$Sysconfig{'LogPrefix'}=$prefix;
} elsif ("\L$syskey" eq "loglimit") {
my $limit=$$Sysconfig{$syskey};
delete $$Sysconfig{$syskey};
$limit =~ s/\s+//g;
if (checkLimit $limit) {
$$Sysconfig{'LogLimit'}=$limit;
} else {
die "unknown loglimit: $limit:\n";
}
} elsif ("\L$syskey" eq "logburst") {
my $burst=$$Sysconfig{$syskey};
delete $$Sysconfig{$syskey};
$burst =~ s/\s+//g;
if ($burst =~/^\d+$/) {
$$Sysconfig{'LogBurst'}=$burst;
} else {
die "unknown logburst: $burst\n";
}
} elsif ("\L$syskey" eq "limit") {
my $limit=$$Sysconfig{$syskey};
delete $$Sysconfig{$syskey};
$limit =~ s/\s+//g;
if (checkLimit $limit) {
$$Sysconfig{'Limit'}=$limit;
} else {
die "unknown limit: $limit:\n";
}
} elsif ("\L$syskey" eq "burst") {
my $burst=$$Sysconfig{$syskey};
delete $$Sysconfig{$syskey};
$burst =~ s/\s+//g;
if ($burst =~/^\d+$/) {
$$Sysconfig{'Burst'}=$burst;
} else {
die "unknown burst: $burst\n";
}
} elsif ("\L$syskey" eq "accountprefix") {
my $prefix=$$Sysconfig{$syskey};
delete $$Sysconfig{$syskey};
$prefix =~ s/\s+//g;
if ($prefix =~/^\w+$/) {
$$Sysconfig{'AccountPrefix'}=$prefix;
} else {
die "invalid account prefix: $prefix\n";
}
} elsif ("\L$syskey" eq "filtercommand") {
my $filter_command=$$Sysconfig{$syskey};
delete $$Sysconfig{$syskey};
$filter_command =~ s/\s+//g;
if ($filter_command eq 'nft') {
$$Sysconfig{'FilterCommand'} = 'nft';
} elsif ($filter_command eq 'iptables') {
$$Sysconfig{'FilterCommand'} = 'iptables';
} elsif ($filter_command eq 'iptables-nft') {
$$Sysconfig{'FilterCommand'} = 'iptables-nft';
} elsif ($filter_command eq 'iptables-legacy') {
$$Sysconfig{'FilterCommand'} = 'iptables-legacy';
} else {
die "invalid packet filter command, use 'nft', 'iptables', 'iptables-nft' or 'iptables-legacy'";
}
} else {
die "unknown sysconfig parameter: $syskey\n";
}
}
}
sub toRange {
my ($range, $proto, $rule) = @_;
if ($range =~ /^(\d*)(|:(\d*))$/) {
if ($1 && $3) {
return "$1:$3";
} elsif ($1 && $2) {
return "$1:65535";
} elsif ($2 && $3) {
return "0:$3";
} elsif ($1) {
return "$1:$1";
} else {
return "0:65535";
}
} else {
die "invalid $proto service: $range:\n$rule\n";
}
}
sub validateData {
my ($Networks, $Services, $Interfaces, $Protocols, $Rules, $Sysconfig, $Marker) = @_;
validateSysconfig $Sysconfig;
my $key;
foreach $key (keys (%$Networks)) {
$$Networks{$key} = resolveHashentries($$Networks{$key}, $Networks);
}
foreach $key (keys (%$Services)) {
$$Services{$key} = resolveHashentries($$Services{$key}, $Services);
}
foreach $key (keys (%$Interfaces)) {
$$Interfaces{$key} = resolveHashentries($$Interfaces{$key}, $Interfaces);
}
foreach $key (keys (%$Interfaces)) {
if (!($$Interfaces{$key} =~ /^[\.a-zA-Z0-9+ ]+(:\d+)?$/)) {
die "invalid character in interface definition: $$Interfaces{$key}\n";
}
}
foreach $key (keys (%$Marker)) {
$$Marker{$key} = resolveHashentries($$Marker{$key}, $Marker);
}
## marken auf plausibilität prüfen
my $rule;
foreach $rule (@$Rules) {
if (exists($$rule{'TranslatedSource'}) && exists($$rule{'TranslatedDestination'})) {
die "can't modify source and destination address in one rule:\n$$rule{'Rule'}\n";
}
my $ruletype=$$rule{'Type'};
if ($ruletype =~ /^\s*(masq|snat|dnat|nat)(\+|-)$/) {
my $type = $1;
my $action = $2;
$$rule{'Table'}='nat';
if ($type eq 'masq') {
if ($ipv6) {
$$rule{'Type'}='IGNORE-IPV6-POSTROUTING';
} else {
$$rule{'Type'}='POSTROUTING';
}
$$rule{'Action'}='MASQUERADE';
} elsif ($type =~ /^(s|d|)nat$/) {
if (exists($$rule{'TranslatedSource'})) {
if ($ipv6) {
$$rule{'Type'}='IGNORE-IPV6-POSTROUTING';
} else {
$$rule{'Type'}='POSTROUTING';
}
$$rule{'Action'}='SNAT';
} elsif (exists($$rule{'TranslatedDestination'})) {
if ($ipv6) {
$$rule{'Type'}='IGNORE-IPV6-PREROUTING';
} else {
$$rule{'Type'}='PREROUTING';
}
$$rule{'Action'}='DNAT';
} else {
die "nat rule without address translation makes no sense:\n$$rule{'Rule'}\n";
}
}
if ($action eq '-') {
$$rule{'Action'}='DROP';
}
} elsif ($ruletype =~ /^\s*(in|out|fw|slin|slout|slfw)(\+|-|\||>|{\w+})$/) {
my $type = $1;
my $action = $2;
$$rule{'Table'}='filter';
if ($type eq 'fw') {
$$rule{'Type'}='FORWARD';
} elsif ($type eq 'in') {
$$rule{'Type'}='INPUT';
} elsif ($type eq 'out') {
$$rule{'Type'}='OUTPUT';
} elsif ($type eq 'slfw') {
$$rule{'Type'}='STATELESSFORWARD';
} elsif ($type eq 'slin') {
$$rule{'Type'}='STATELESSINPUT';
} else {
$$rule{'Type'}='STATELESSOUTPUT';
}
if ($action eq '+') {
$$rule{'Action'}='ACCEPT';
} elsif ($action eq '-') {
$$rule{'Action'}='DROP';
} elsif ($action eq '|') {
if ($$rule{'Type'} =~ /OUTPUT/) {
die "can't use mirror in OUTPUT chain\n";
} else {
$$rule{'Action'}='MIRROR';
}
} elsif ($action =~ /^{(\w+)}$/) {
my $marker=$1;
$$rule{'Action'}='MARK';
$$rule{'Table'}='mangle';
if (exists($$Marker{$marker})) {
my @dummy = split(/\s+/, $$Marker{$marker});
if ($#dummy == 1) {
$$rule{'Mark'}=$$Marker{$marker};
} else {
die "can't mark packet with multiple mark values: $marker\n$$rule{'Rule'}\n";
}
} else {
die "invalid mark identifier: $marker\n$$rule{'Rule'}\n";
}
} else {
if ($$rule{'Type'} =~ /INPUT/) {
die "can't use TCPMSS in INPUT chain\n";
} else {
$$rule{'Action'}='TCPMSS';
}
}
if (exists($$rule{'TranslatedSource'}) || exists($$rule{'TranslatedDestination'}) || exists($$rule{'TranslatedService'})) {
die "you can modify source or destination address only in nat rules:\n$$rule{'Rule'}\n";
}
} else {
die "unknown ruletype:\n$$rule{'Rule'}\n";
}
my $hashentry;
foreach $hashentry (qw(Source Destination TranslatedSource TranslatedDestination)) {
my @simplenetwork;
if (exists($$rule{$hashentry})) {
my $position;
foreach $position (split (/\s+/, $$rule{$hashentry})) {
$position eq '' && next;
$position =~ /^(!{0,1})(.*)/;
if ($1) {
$$rule{"${hashentry}-not"} = 1;
}
$position=$2;
# support IPv4-only/IPv6-only rules
if ($position =~ /^.*\((.+)\)$/) {
my $only_proto = $1;
$position =~ s/\((.+)\)$//;
if (($ipv6) && ($only_proto eq "4")) {
print STDERR "IPv6 setup: Skipping IPv4-only rule for network \"$position\"\n";
$$rule{'Type'} = 'IGNORE-IPV4-ONLY';
next;
} elsif ((! $ipv6) && ($only_proto eq "6")) {
print STDERR "IPv4 setup: Skipping IPv6-only rule for network \"$position\"\n";
$$rule{'Type'} = 'IGNORE-IPV6-ONLY';
next;
}
}
if ($$rule{'Type'} =~ /^IGNORE\-IPV6\-.*$/) {
next;
}
if (exists($$Networks{$position})) {
my $network;
foreach $network (split (/\s+/, $$Networks{$position})) {
$network eq '' && next;
push (@simplenetwork, $network);
}
} else {
die "invalid network name: $position\n$$rule{'Rule'}\n";
}
}
@simplenetwork = simplifyNetworks (@simplenetwork);
my $network;
for $network (@simplenetwork) {
if ( ( $network =~ /(^[^=]+)=([^=]+)$/ ) && ( ! ( $hashentry =~ /^.*Source$/ ) ) ) {
die "MAC address sources don't make sense on destination networks";
}
if ( ( $network =~ /(^[^=]+)=([^=]+)$/ ) && ( $$rule{'Type'} eq 'OUTPUT' ) ) {
die "MAC address sources don't make sense for outward bound rules";
}
}
$$rule{$hashentry} = \@simplenetwork;
}
}
foreach (qw(TranslatedSource TranslatedDestination)) {
if (exists($$rule{$_}) && @{$$rule{$_}}>1) {
die "you can specify only one source or destination network as nat target:\n$$rule{'Rule'}\n";
}
if (exists($$rule{"$_-not"})) {
die "inverting nat destinations is not possible\n$$rule{'Rule'}\n";
}
}
foreach (qw(Source Destination)) {
if (exists($$rule{"${_}-not"}) && @{$$rule{$_}}>1) {
die "you can specify only one source or destination network with not statement:\n$$rule{'Rule'}\n";
}
}
if (exists($$rule{'MarkMatch'})) {
my $mark;
my @array;
foreach $mark (split (/\s+/, $$rule{'MarkMatch'})) {
$mark eq '' && next;
foreach (split(/\s+/, $$Marker{$mark})) {
$_ eq '' && next;
push (@array, $_);
}
}
$$rule{'MarkMatch'}=\@array;
}
foreach $hashentry (qw(InputInterface OutputInterface PhysicalInputInterface PhysicalOutputInterface)) {
if (exists($$rule{$hashentry})) {
if (($hashentry eq 'InputInterface' || $hashentry eq 'PhysicalInputInterface') && $$rule{'Type'} =~ /(OUTPUT|POSTROUTING)/) {
die "can't use input interface in output rule:\n$$rule{'Rule'}\n";
} elsif (($hashentry eq 'OutputInterface' || $hashentry eq 'PhysicalOutputInterface') && $$rule{'Type'} =~ /(INPUT|PREROUTING)/) {
die "can't use output interface in input rule:\n$$rule{'Rule'}\n";
}
my $position;
my %interfacehash;
foreach $position (split (/\s+/, $$rule{$hashentry})) {
$position eq '' && next;
$position =~ /^(!{0,1})(.*)/;
if ($1) {
$$rule{"${hashentry}-not"} = 1;
}
$position=$2;
if (exists($$Interfaces{$position})) {
my $interface;
foreach $interface (split (/\s+/, $$Interfaces{$position})) {
$interface eq '' && next;
$interfacehash{$interface}=1;
}
} else {
die "invalid interface entry: $position\n";
}
}
my @array = keys (%interfacehash);
$$rule{$hashentry} = \@array;
}
if (exists($$rule{"${hashentry}-not"}) && @{$$rule{$hashentry}}>1) {
die "you can specify only one input or output interface with not statement:\n$$rule{'Rule'}\n";
}
}
my $serviceentry;
my $servicecounter=0;
foreach $serviceentry (qw(Service TranslatedService)) {
$servicecounter=0;
if (exists($$rule{$serviceentry})) {
my $serviceprefix='';
if ($serviceentry eq 'TranslatedService') {
$serviceprefix='Translated';
}
my @newservice;
my $position;
my %protocols;
foreach $position (split (/\s+/, $$rule{$serviceentry})) {
$position eq '' && next;
$position =~ /^(!{0,1})(.*)/;
if ($1) {
if ($serviceprefix) {
die "can't use not in nat destination service description: $position\n$$rule{'Rule'}\n";
}
$$rule{"Service-not"}=1;
}
$position=$2;
if (exists($$Services{$position})) {
my $service;
foreach $service (split (/\s+/, $$Services{$position})) {
$service eq '' && next;
if ($service =~ /^([\w-]+)\((.*)\)$/) {
my $proto=$1;
my $param=$2;
if ($param eq '') {
$param='all';
}
if (exists($$Protocols{$proto})) {
if ($proto =~ /^\d+$/) {
$proto = $$Protocols{$proto};
}
} else {
die "unknown protocol: $service:\n$$rule{'Rule'}\n";
}
$protocols{"$serviceprefix$proto"}.=" $param";
} else {
die "invalid service entry: $service:\n$$rule{'Rule'}\n";
}
}
} else {
die "invalid service entry: $position\n";
}
}
delete $$rule{$serviceentry};
my $proto;
foreach $proto (qw(udp tcp)) {
if (exists($protocols{"$serviceprefix$proto"})) {
my @multisource;
my @multidestination;
my @sourcerange;
my @destinationrange;
my @sourcedestination;
my %other;
my $service;
foreach $service (split (/\s+/, $protocols{"$serviceprefix$proto"})) {
$service eq '' && next;
if ($service =~ /^([^\/]*)\/([^\/]*)$/) {
my $range=toRange ($1, $proto, $$rule{'Rule'});
$range.="/".toRange ($2, $proto, $$rule{'Rule'});
$other{$range}=1;
} else {
die "invalid $proto service: $service:\n$$rule{'Rule'}\n";
}
}
my $again=0;
my $first=1;
while ($first || $again) {
$first=0;
$again=0;
LOOP: foreach $service (keys (%other)) {
next unless exists($other{$service});
if ($service =~ /^(\d+):(\d+)\/(\d+):(\d+)$/) {
my $ss=$1;
my $se=$2;
my $ds=$3;
my $de=$4;
if ($ss>$se || $ds>$de) {
die "invalid port range: $service:\n$$rule{'Rule'}\n";
}
my $test;
foreach $test (keys (%other)) {
$test eq $service && next;
$test =~ /(\d+):(\d+)\/(\d+):(\d+)/;
if ( $1 == $ss &&
$2 == $se ) {
if ( $3 >= $ds &&
$4 <= $de) {
delete $other{$test};
$again=1;
last LOOP;
}
if ( $4 == $ds-1 ||
($4 >= $ds && $4 <= $de)) {
$ds=$3;
$de=$4 if $4>$de;
delete $other{$service};
delete $other{$test};
$other{"$ss:$se/$ds:$de"}=1;
$again=1;
last LOOP;
}
} elsif ( $3 == $ds &&
$4 == $de ) {
if ( $1 >= $ss &&
$2 <= $se) {
delete $other{$test};
$again=1;
last LOOP;
}
if ( $2 == $ss-1 ||
($2 >= $ss && $2 <= $se)) {
$ss=$1;
$se=$2 if $2>$se;
delete $other{$service};
delete $other{$test};
$other{"$ss:$se/$ds:$de"}=1;
$again=1;
last LOOP;
}
}
}
} else {
die "invalid service entry: $service:\n$$rule{'Rule'}\n";
}
}
}
my $entry;
foreach $entry (keys (%other)) {
if ($entry =~ /(\d+):(\d+)\/0:65535/) {
if ($1 != $2) {
push (@sourcerange, "$1:$2");
} else {
push (@multisource, $1);
}
} elsif ($entry =~ /0:65535\/(\d+):(\d+)/) {
if ($1 != $2) {
push (@destinationrange, "$1:$2");
} else {
push (@multidestination, $1);
}
} else {
push (@sourcedestination, $entry);
}
}
if ($serviceprefix eq '') {
expandRange (\@sourcerange, \@multisource);
expandRange (\@destinationrange, \@multidestination);
}
$$rule{"$serviceprefix\u$proto"}= [\@multisource, \@multidestination, \@sourcerange, \@destinationrange, \@sourcedestination];
$servicecounter+=@multisource+@multidestination+@sourcerange+@destinationrange+@sourcedestination;
delete $protocols{"$serviceprefix$proto"};
}
}
if ($serviceprefix ne '' && $servicecounter>1) {
die "you can specify only one service or service range as nat target:\n$$rule{'Rule'}\n";
}
if (exists($$rule{"Service-not"}) && $serviceprefix eq '' && $servicecounter>1) {
die "you can specify only one service in not statement:\n$$rule{'Rule'}\n";
}
if (exists($protocols{"${serviceprefix}icmp"})) {
if ($serviceprefix ne '') {
die "can't use icmp nat target:\n$$rule{'Rule'}\n";
}
my %icmphash;
my $message;
foreach $message (split (/\s+/, $protocols{"${serviceprefix}icmp"})) {
# message validation missing
$message eq '' && next;
$icmphash{$message}=1;
}
my @array = keys (%icmphash);
$$rule{"${serviceprefix}ICMP"}=\@array;
delete $protocols{"${serviceprefix}icmp"};
}
if (exists($protocols{"${serviceprefix}ipv6-icmp"})) {
if ($serviceprefix ne '') {
die "can't use ipv6-icmp nat target:\n$$rule{'Rule'}\n";
}
my %icmp6hash;
my $message;
foreach $message (split (/\s+/, $protocols{"${serviceprefix}ipv6-icmp"})) {
# message validation missing
$message eq '' && next;
$icmp6hash{$message}=1;
}
my @array = keys (%icmp6hash);
$$rule{"${serviceprefix}ICMP6"}=\@array;
delete $protocols{"${serviceprefix}ipv6-icmp"};
}
if (keys (%protocols)) {
if ($serviceprefix ne '') {
die "you can use tcp and udp based nat targets only:\n$$rule{'Rule'}\n";
}
my @array = keys (%protocols);
$$rule{"${serviceprefix}OtherProtocols"} = \@array;
}
}
}
if ( (exists($$rule{'TranslatedTcp'}) && exists($$rule{'Udp'})) ||
(exists($$rule{'TranslatedUdp'}) && exists($$rule{'Tcp'}))) {
die "source protocol and translated protocol must be equal in nat rule:\n$$rule{'Rule'}\n";
}
if (exists($$rule{'Flags'})) {
my $flag;
foreach $flag (split (/\s+/, $$rule{'Flags'})) {
$flag eq '' && next;
if ($flag =~ /^log(\((.+)\)|)$/) {
$$rule{'Log'}=$2;
} elsif ($flag =~ /^reject(\((.+)\)|)$/) {
if ($$rule{'Table'} eq 'nat') {
die "can't use reject with nat:\n$$rule{'Rule'}\n";
}
if ($$rule{'Action'} ne 'DROP') {
die "rejecting packets in allow rule makes no sense:\n$$rule{'Rule'}\n";
}
if ($2) {
my $param=$2;
if ($param =~ /^(icmp-(net|host|port|proto)-unreachable|icmp-(net|host)-prohibited|tcp-reset)$/) {
$$rule{'Reject'}=$param;
} else {
die "invalid reject parameter: $param:\n$$rule{'Rule'}\n";
}
if ($param eq 'tcp-reset') {
if (exists($$rule{'OtherProtocols'}) || exists($$rule{'ICMP'}) || exists($$rule{'ICMP6'}) || exists($$rule{'Udp'})) {
die "can't use tcp-reset with other protocols than tcp:\n$$rule{'Rule'}\n";
}
unless (exists($$rule{'Tcp'})) {
die "need tcp protocol for tcp-reset:\n$$rule{'Rule'}\n";
}
}
} else {
$$rule{'Reject'}=1;
}
} elsif ($flag =~ /^account(\((.+)\)|)$/) {
if ($$rule{'Table'} eq 'nat') {
die "can't use accounting with nat:\n$$rule{'Rule'}\n";
}
if ($$rule{'Action'} eq 'DROP') {
die "accounting packets in reject/drop rule makes no sense:\n$$rule{'Rule'}\n";
}