config/forwardfw/rules.pl

   1 #!/usr/bin/perl
   2 ###############################################################################
   3 #                                                                             #
   4 # IPFire.org - A linux based firewall                                         #
   5 # Copyright (C) 2012                                                                                                              #
   6 #                                                                             #
   7 # This program is free software: you can redistribute it and/or modify        #
   8 # it under the terms of the GNU General Public License as published by        #
   9 # the Free Software Foundation, either version 3 of the License, or           #
  10 # (at your option) any later version.                                         #
  11 #                                                                             #
  12 # This program is distributed in the hope that it will be useful,             #
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of              #
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               #
  15 # GNU General Public License for more details.                                #
  16 #                                                                             #
  17 # You should have received a copy of the GNU General Public License           #
  18 # along with this program.  If not, see <http://www.gnu.org/licenses/>.       #
  19 #                                                                             #
  20 ###############################################################################
  21 #                                                                                                                                                         #
  22 # Hi folks! I hope this code is useful for all. I needed something to handle  #
  23 # my VPN Connections in a comfortable way.                                                                #
  24 # This script builds firewallrules from the webinterface                      #
  25 ###############################################################################
  26
  27 use strict;
  28 no warnings 'uninitialized';
  29
  30 # enable only the following on debugging purpose
  31 #use warnings;
  32 #use CGI::Carp 'fatalsToBrowser';
  33
  34 my %fwdfwsettings=();
  35 my %defaultNetworks=();
  36 my %configfwdfw=();
  37 my %color=();
  38 my %icmptypes=();
  39 my %ovpnSettings=();
  40 my %customgrp=();
  41 our %sourcehash=();
  42 our %targethash=();
  43 my @timeframe=();
  44 my %configinputfw=();
  45 my %aliases=();
  46 my @DPROT=();
  47 my @p2ps=();
  48 require '/var/ipfire/general-functions.pl';
  49 require "${General::swroot}/lang.pl";
  50 require "${General::swroot}/forward/bin/firewall-lib.pl";
  51
  52 my $configfwdfw         = "${General::swroot}/forward/config";
  53 my $configinput     = "${General::swroot}/forward/input";
  54 my $p2pfile                     = "${General::swroot}/forward/p2protocols";
  55 my $configgrp           = "${General::swroot}/fwhosts/customgroups";
  56 my $errormessage='';
  57 my ($TYPE,$PROT,$SPROT,$DPROT,$SPORT,$DPORT,$TIME,$TIMEFROM,$TIMETILL,$SRC_TGT);
  58 my $CHAIN="FORWARDFW";
  59
  60
  61 &General::readhash("${General::swroot}/forward/settings", \%fwdfwsettings);
  62 &General::readhasharray($configfwdfw, \%configfwdfw);
  63 &General::readhasharray($configinput, \%configinputfw);
  64 &General::readhasharray($configgrp, \%customgrp);
  65 &General::get_aliases(\%aliases);
  66
  67 ################################
  68 #    DEBUG/TEST                #
  69 ################################
  70 my $MODE=1;     # 0 - normal operation
  71                                 # 1 - print configline and rules to console
  72                                 #
  73 ################################
  74 my $param=shift;
  75
  76 if($param eq 'flush'){
  77         if ($MODE eq '1'){
  78                 print " Flushing chains...\n";
  79         }
  80         &flush;
  81 }else{
  82         if ($MODE eq '1'){
  83                 print " Flushing chains...\n";
  84         }
  85         &flush;
  86         if ($MODE eq '1'){
  87                 print " Preparing rules...\n";
  88         }
  89         &preparerules;
  90         if($MODE eq '0'){
  91                 if ($fwdfwsettings{'POLICY'} eq 'MODE1'){
  92                         system ("/usr/sbin/firewall-forward-policy");
  93                 }elsif($fwdfwsettings{'POLICY'} eq 'MODE2'){
  94                         system ("/usr/sbin/firewall-forward-policy");
  95                 }elsif($fwdfwsettings{'POLICY'} eq 'MODE0' || $fwdfwsettings{'POLICY'} eq 'MODE2'){
  96                         system ("/usr/sbin/firewall-forward-policy");
  97                         system ("iptables -A $CHAIN -m state --state NEW -j ACCEPT");
  98                 }
  99         }
 100 }
 101 sub flush
 102 {
 103         system ("iptables -F FORWARDFW");
 104         system ("iptables -F INPUTFW");
 105 }
 106 sub preparerules
 107 {
 108         if (! -z  "${General::swroot}/forward/config"){
 109                 &buildrules(\%configfwdfw);
 110                 &p2pblock;
 111         }
 112         if (! -z  "${General::swroot}/forward/input"){
 113                 &buildrules(\%configinputfw);
 114         }
 115 }
 116 sub buildrules
 117 {
 118         my $hash=shift;
 119         my $STAG;
 120         foreach my $key (sort {$a <=> $b} keys %$hash){
 121                 $STAG='';
 122                 if($$hash{$key}[2] eq 'ON'){
 123                         #get source ip's
 124                         if ($$hash{$key}[3] eq 'cust_grp_src'){
 125                                 foreach my $grp (sort {$a <=> $b} keys %customgrp){
 126                                                 if($customgrp{$grp}[0] eq $$hash{$key}[4]){
 127                                                 &get_address($customgrp{$grp}[3],$customgrp{$grp}[2],"src");
 128                                         }
 129                                 }
 130                         }else{
 131                                 &get_address($$hash{$key}[3],$$hash{$key}[4],"src");
 132                         }
 133                         #get target ip's
 134                         if ($$hash{$key}[5] eq 'cust_grp_tgt'){
 135                                 foreach my $grp (sort {$a <=> $b} keys %customgrp){
 136                                         if($customgrp{$grp}[0] eq $$hash{$key}[6]){
 137                                                 &get_address($customgrp{$grp}[3],$customgrp{$grp}[2],"tgt");
 138                                         }
 139                                 }
 140                         }elsif($$hash{$key}[5] eq 'ipfire'){
 141
 142                                 if($$hash{$key}[6] eq 'Default IP'){
 143                                         open(FILE, "/var/ipfire/red/local-ipaddress") or die 'Unable to open config file.';
 144                                         $targethash{$key}[0]= <FILE>;
 145                                         close(FILE);
 146                                 }else{
 147                                         foreach my $alias (sort keys %aliases){
 148                                                 if ($$hash{$key}[6] eq $alias){
 149                                                         $targethash{$key}[0]=$aliases{$alias}{'IPT'};
 150                                                 }
 151                                         }
 152                                 }
 153                         }else{
 154                                 &get_address($$hash{$key}[5],$$hash{$key}[6],"tgt");
 155                         }
 156                         ##get source prot and port
 157                         $SRC_TGT='SRC';
 158                         $SPROT = &get_prot($hash,$key);
 159                         $SPORT = &get_port($hash,$key);
 160                         $SRC_TGT='';
 161
 162                         ##get target prot and port
 163                         $DPROT=&get_prot($hash,$key);
 164
 165                         if ($DPROT eq ''){$DPROT=' ';}
 166                         @DPROT=split(",",$DPROT);
 167
 168                         #get time if defined
 169                         if($$hash{$key}[18] eq 'ON'){
 170                                 if($$hash{$key}[19] ne ''){push (@timeframe,"Mon");}
 171                                 if($$hash{$key}[20] ne ''){push (@timeframe,"Tue");}
 172                                 if($$hash{$key}[21] ne ''){push (@timeframe,"Wed");}
 173                                 if($$hash{$key}[22] ne ''){push (@timeframe,"Thu");}
 174                                 if($$hash{$key}[23] ne ''){push (@timeframe,"Fri");}
 175                                 if($$hash{$key}[24] ne ''){push (@timeframe,"Sat");}
 176                                 if($$hash{$key}[25] ne ''){push (@timeframe,"Sun");}
 177                                 $TIME=join(",",@timeframe);
 178                                 $TIMEFROM="--timestart $$hash{$key}[26] ";
 179                                 $TIMETILL="--timestop $$hash{$key}[27] ";
 180                                 $TIME="-m time --weekdays $TIME $TIMEFROM $TIMETILL";
 181                         }
 182                         if ($MODE eq '1'){
 183                                 print "NR:$key ";
 184                                 foreach my $i (0 .. $#{$$hash{$key}}){
 185                                         print "$i: $$hash{$key}[$i]  ";
 186                                 }
 187                                 print "\n";
 188                                 print"##################################\n";
 189                                 #print rules to console
 190                                 foreach my $DPROT (@DPROT){
 191                                         $DPORT = &get_port($hash,$key,$DPROT);
 192                                         if ($SPROT ne ''){$PROT=$SPROT;}else{$PROT=$DPROT;}
 193                                         $PROT="-p $PROT" if ($PROT ne '' && $PROT ne ' ');
 194                                         foreach my $a (sort keys %sourcehash){
 195                                                 foreach my $b (sort keys %targethash){
 196                                                         if ($sourcehash{$a}[0] ne $targethash{$b}[0] && $targethash{$b}[0] ne 'none'){
 197                                                                 if($SPROT eq '' || $SPROT eq $DPROT || $DPROT eq ' '){
 198                                                                         if(substr($sourcehash{$a}[0], 3, 3) ne 'mac'){ $STAG="-s";}
 199                                                                         if ($$hash{$key}[17] eq 'ON'){
 200                                                                                 print "iptables -A $$hash{$key}[1] $PROT $STAG $sourcehash{$a}[0] $SPORT -d $targethash{$b}[0] $DPORT $TIME -j LOG\n";
 201                                                                         }
 202                                                                         print "iptables -A $$hash{$key}[1] $PROT $STAG $sourcehash{$a}[0] $SPORT -d $targethash{$b}[0] $DPORT $TIME -j $$hash{$key}[0]\n";
 203                                                                 }
 204                                                         }
 205                                                 }
 206                                         }
 207                                         print"\n";
 208                                 }
 209                         }elsif($MODE eq '0'){
 210                                 foreach my $DPROT (@DPROT){
 211                                         $DPORT = &get_port($hash,$key,$DPROT);
 212                                         if ($SPROT ne ''){$PROT=$SPROT;}else{$PROT=$DPROT;}
 213                                         $PROT="-p $PROT" if ($PROT ne '' && $PROT ne ' ');
 214                                         foreach my $a (sort keys %sourcehash){
 215                                                 foreach my $b (sort keys %targethash){
 216                                                         if ($sourcehash{$a}[0] ne $targethash{$b}[0] && $targethash{$b}[0] ne 'none'){
 217                                                                 if($SPROT eq '' || $SPROT eq $DPROT || $DPROT eq ' '){
 218                                                                         if(substr($sourcehash{$a}[0], 3, 3) ne 'mac'){ $STAG="-s";}
 219                                                                         if ($$hash{$key}[17] eq 'ON'){
 220                                                                                 system ("iptables -A $$hash{$key}[1] $PROT $STAG $sourcehash{$a}[0] $SPORT -d $targethash{$b}[0] $DPORT $TIME -j LOG");
 221                                                                         }
 222                                                                         system ("iptables -A $$hash{$key}[1] $PROT $STAG $sourcehash{$a}[0] $SPORT -d $targethash{$b}[0] $DPORT $TIME -j $$hash{$key}[0]");
 223                                                                 }
 224                                                         }
 225                                                 }
 226                                         }
 227                                         print"\n";
 228                                 }
 229                         }
 230                 }
 231                 %sourcehash=();
 232                 %targethash=();
 233                 undef $TIME;
 234                 undef $TIMEFROM;
 235                 undef $TIMETILL;
 236         }
 237 }
 238 sub p2pblock
 239 {
 240         my $P2PSTRING;
 241         my $DO;
 242         open( FILE, "< $p2pfile" ) or die "Unable to read $p2pfile";
 243         @p2ps = <FILE>;
 244         close FILE;
 245         my $CMD = "-m ipp2p";
 246         foreach my $p2pentry (sort @p2ps) {
 247                 my @p2pline = split( /\;/, $p2pentry );
 248                 if ( $fwdfwsettings{'POLICY'} eq 'MODE2' ) {
 249                         $DO = "DROP";
 250                         if ("$p2pline[2]" eq "off") {
 251                                 $P2PSTRING = "$P2PSTRING --$p2pline[1]";
 252                         }
 253                 } else {
 254                         $DO = "RETURN";
 255                         if ("$p2pline[2]" eq "on") {
 256                                 $P2PSTRING = "$P2PSTRING --$p2pline[1]";
 257                         }
 258                 }
 259         }
 260         if ($MODE eq 1){
 261                 if($P2PSTRING){
 262                         print"/sbin/iptables -A FORWARDFW $CMD $P2PSTRING -j $DO\n";
 263                 }
 264         }else{
 265                 if($P2PSTRING){
 266                         system("/sbin/iptables -A FORWARDFW $CMD $P2PSTRING -j $DO");
 267                 }
 268         }
 269 }
 270
 271 sub get_address
 272 {
 273         my $base=shift; #source of checking ($configfwdfw{$key}[x] or groupkey
 274         my $base2=shift;
 275         my $type=shift; #src or tgt
 276         my $hash;
 277         if ($type eq 'src'){
 278                 $hash=\%sourcehash;
 279         }else{
 280                 $hash=\%targethash;
 281         }
 282         my $key = &General::findhasharraykey($hash);
 283         if($base eq 'src_addr' || $base eq 'tgt_addr' ){
 284                 if (&General::validmac($base2)){
 285                         $$hash{$key}[0] = "-m mac --mac-source $base2";
 286                 }else{
 287                         $$hash{$key}[0] = $base2;
 288                 }
 289         }elsif($base eq 'std_net_src' || $base eq 'std_net_tgt' || $base eq 'Standard Network'){
 290                 $$hash{$key}[0]=&fwlib::get_std_net_ip($base2);
 291         }elsif($base eq 'cust_net_src' || $base eq 'cust_net_tgt' || $base eq 'Custom Network'){
 292                 $$hash{$key}[0]=&fwlib::get_net_ip($base2);
 293         }elsif($base eq 'cust_host_src' || $base eq 'cust_host_tgt' || $base eq 'Custom Host'){
 294                 $$hash{$key}[0]=&fwlib::get_host_ip($base2,$type);
 295         }elsif($base eq 'ovpn_net_src' || $base eq 'ovpn_net_tgt' || $base eq 'OpenVPN static network'){
 296                 $$hash{$key}[0]=&fwlib::get_ovpn_net_ip($base2,1);
 297         }elsif($base eq 'ovpn_host_src' ||$base eq 'ovpn_host_tgt' || $base eq 'OpenVPN static host'){
 298                 $$hash{$key}[0]=&fwlib::get_ovpn_host_ip($base2,33);
 299         }elsif($base eq 'ovpn_n2n_src' ||$base eq 'ovpn_n2n_tgt' || $base eq 'OpenVPN N-2-N'){
 300                 $$hash{$key}[0]=&fwlib::get_ovpn_n2n_ip($base2,27);
 301         }elsif($base eq 'ipsec_net_src' || $base eq 'ipsec_net_tgt' || $base eq 'IpSec Network'){
 302                 $$hash{$key}[0]=&fwlib::get_ipsec_net_ip($base2,11);
 303         }
 304 }
 305 sub get_prot
 306 {
 307         my $hash=shift;
 308         my $key=shift;
 309         if ($$hash{$key}[7] eq 'ON' && $SRC_TGT eq 'SRC'){
 310                 if ($$hash{$key}[10] ne ''){
 311                         return"$$hash{$key}[8]";
 312                 }elsif($$hash{$key}[9] ne ''){
 313                         return"$$hash{$key}[8]";
 314                 }else{
 315                         return "$$hash{$key}[8]";
 316                 }
 317         }elsif($$hash{$key}[11] eq 'ON' && $SRC_TGT eq ''){
 318                 if ($$hash{$key}[14] eq 'TGT_PORT'){
 319                         if ($$hash{$key}[15] ne ''){
 320                                 return "$$hash{$key}[12]";
 321                         }elsif($$hash{$key}[13] ne ''){
 322                                 return "$$hash{$key}[12]";
 323                         }else{
 324                                 return "$$hash{$key}[12]";
 325                         }
 326                 }elsif($$hash{$key}[14] eq 'cust_srv'){
 327                         return &fwlib::get_srv_prot($$hash{$key}[15]);
 328
 329                 }elsif($$hash{$key}[14] eq 'cust_srvgrp'){
 330                         return &fwlib::get_srvgrp_prot($$hash{$key}[15]);
 331                 }
 332         }
 333 }
 334 sub get_port
 335 {
 336         my $hash=shift;
 337         my $key=shift;
 338         my $prot=shift;
 339         if ($$hash{$key}[7] eq 'ON' && $SRC_TGT eq 'SRC'){
 340                 if ($$hash{$key}[10] ne ''){
 341                         return "--sport $$hash{$key}[10] ";
 342                 }elsif($$hash{$key}[9] ne '' && $$hash{$key}[9] ne 'All ICMP-Types'){
 343                         return "--icmp-type $$hash{$key}[9] ";
 344                 }elsif($$hash{$key}[9] eq 'All ICMP-Types'){
 345                         return;
 346                 }
 347         }elsif($$hash{$key}[11] eq 'ON' && $SRC_TGT eq ''){
 348
 349                 if($$hash{$key}[14] eq 'TGT_PORT'){
 350                         if ($$hash{$key}[15] ne ''){
 351                                 return "--dport $$hash{$key}[15] ";
 352                         }elsif($$hash{$key}[13] ne '' && $$hash{$key}[13] ne 'All ICMP-Types'){
 353                                 return "--icmp-type $$hash{$key}[13] ";
 354                         }elsif($$hash{$key}[13] ne '' && $$hash{$key}[13] eq 'All ICMP-Types'){
 355                                 return;
 356                         }
 357                 }elsif($$hash{$key}[14] eq 'cust_srv'){
 358                         if ($prot ne 'ICMP'){
 359                                 return "--dport ".&fwlib::get_srv_port($$hash{$key}[15],1,$prot);
 360                         }elsif($prot eq 'ICMP' && $$hash{$key}[15] ne 'All ICMP-Types'){
 361                                 return "--icmp-type ".&fwlib::get_srv_port($$hash{$key}[15],3,$prot);
 362                         }elsif($prot eq 'ICMP' && $$hash{$key}[15] eq 'All ICMP-Types'){
 363                                 return;
 364                         }
 365                 }elsif($$hash{$key}[14] eq 'cust_srvgrp'){
 366                         if      ($prot ne 'ICMP'){
 367                                 return &fwlib::get_srvgrp_port($$hash{$key}[15],$prot);
 368                         }
 369                         elsif($prot eq 'ICMP'){
 370                                 return &fwlib::get_srvgrp_port($$hash{$key}[15],$prot);
 371                         }
 372                 }
 373         }
 374 }