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#!/usr/bin/perl
#Copyright (c) 2009 Eucalyptus Systems, Inc.
#
#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, only version 3 of the License.
#
#This file 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, see <http://www.gnu.org/licenses/>.
#
#Please contact Eucalyptus Systems, Inc., 130 Castilian
#Dr., Goleta, CA 93101 USA or visit <http://www.eucalyptus.com/licenses/>
#if you need additional information or have any questions.
#
#This file may incorporate work covered under the following copyright and
#permission notice:
#
# Software License Agreement (BSD License)
#
# Copyright (c) 2008, Regents of the University of California
#
#
# Redistribution and use of this software in source and binary forms, with
# or without modification, are permitted provided that the following
# conditions are met:
#
# Redistributions of source code must retain the above copyright notice,
# this list of conditions and the following disclaimer.
#
# Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
# IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
# PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
# OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
# EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
# PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
# PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
# LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
# NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. USERS OF
# THIS SOFTWARE ACKNOWLEDGE THE POSSIBLE PRESENCE OF OTHER OPEN SOURCE
# LICENSED MATERIAL, COPYRIGHTED MATERIAL OR PATENTED MATERIAL IN THIS
# SOFTWARE, AND IF ANY SUCH MATERIAL IS DISCOVERED THE PARTY DISCOVERING
# IT MAY INFORM DR. RICH WOLSKI AT THE UNIVERSITY OF CALIFORNIA, SANTA
# BARBARA WHO WILL THEN ASCERTAIN THE MOST APPROPRIATE REMEDY, WHICH IN
# THE REGENTS' DISCRETION MAY INCLUDE, WITHOUT LIMITATION, REPLACEMENT
# OF THE CODE SO IDENTIFIED, LICENSING OF THE CODE SO IDENTIFIED, OR
# WITHDRAWAL OF THE CODE CAPABILITY TO THE EXTENT NEEDED TO COMPLY WITH
# ANY SUCH LICENSES OR RIGHTS.
#
use Digest::MD5 qw(md5 md5_hex md5_base64);
use MIME::Base64;
delete @ENV{qw(IFS CDPATH ENV BASH_ENV)};
$ENV{'PATH'}='/bin:/usr/bin:/sbin:/usr/sbin/';
if (@ARGV == 3) {
print STDERR "DO NEW EUCA_IPT\n";
doexit(new_euca_ipt(@ARGV), "done\n");
} elsif (@ARGV == 2) {
print STDERR "DO OLD EUCA_IPT\n";
doexit(old_euca_ipt(@ARGV), "done\n");
} else {
dodie("euca_ipt: wrong number of commandline parameters\n");
}
sub old_euca_ipt() {
$table = shift @_;
if ($table =~ /^([ &:#-\@\w.]+)$/) {
$table = $1; #data is now untainted
} else {
return(1);
}
$rulefile = shift @_;
if ($rulefile =~ /^([ &:#-\@\w.]+)$/) {
$rulefile = $1; #data is now untainted
} else {
return(1);
}
if (!$table || !$rulefile || !($table eq "filter" || $table eq "nat") || $rulefile eq "" || !-f $rulefile) {dodie("cannot verify commandline parameters\n");}
@workingfiles = ("$rulefile.orig", "$rulefile.new");
open my $fh, '-|' or exec 'iptables-save', ("-t", "$table") or dodie ("iptables-save failed: $!\n");
open(OFH, ">$rulefile.orig") or dodie ("cannot open $rulefile.orig");
$outbuf = "";
while(<$fh>) {
chomp;
my $line = $_;
$line =~ s/\s+$//g;
$line =~ s/^\s+//g;
print OFH "$line\n";
}
close($fh) || dodie ("iptables-save failed\n");
close(OFH);
$added=0;
$outbuf = "";
open(FH, "$rulefile.orig");
while(<FH>) {
chomp;
my $line = $_;
$line =~ s/\s+$//g;
$line =~ s/^\s+//g;
if ($line eq "COMMIT") {
# time to load the input rules
open (RFH, "$rulefile");
while(<RFH>) {
chomp;
my $line = $_;
$line =~ s/\s+$//g;
$line =~ s/^\s+//g;
if ($line ne "" && !$rulehash{$line}) {
$buf .= "$line\n";
$rulehash{$line} = 1;
$added=1;
}
}
close(RFH);
}
if ($line ne "" && !$rulehash{$line}) {
$buf .= "$line\n";
$rulehash{$line} = 1;
}
}
close(FH);
if (!$added) {
return(0);
}
open (OFH, ">$rulefile.new");
print OFH "$buf\n";
close(OFH);
if (!-f "$rulefile.new") {
dodie("cannot find $rulefile.new");
}
$rc = system("cat $rulefile.new | iptables-restore");
if ($rc) {
print STDERR "iptables-restore failed: rulefile contents:\n";
system("cat $rulefile.new 1>&2");
dodie("iptables-restore failed\n");
}
# open my $fh, '|-' or exec 'iptables-restore' or dodie( "iptables-restore failed: $!\n");
# open(IFH, "$rulefile.new") or dodie( "cannot open $rulefile.new");
# while(<IFH>) {
# print $fh "$_";
# }
# close($fh) || dodie( "iptables-restore failed\n");
# close(IFH);
return(0);
}
sub new_euca_ipt() {
$table = shift @_;
if ($table =~ /^([ &:#-\@\w.]+)$/) {
$table = $1; #data is now untainted
} else {
return(1);
}
$rulefile = shift @_;
if ($rulefile =~ /^([ &:#-\@\w.]+)$/) {
$rulefile = $1; #data is now untainted
} else {
return(1);
}
$chainmapfile = shift @_;
if ($chainmapfile =~ /^([ &:#-\@\w.]+)$/) {
$chainmapfile = $1; #data is now untainted
} else {
return(1);
}
if (!$table || !$rulefile || !$chainmapfile || !($table eq "filter" || $table eq "nat") || $rulefile eq "" || !-f $rulefile || $chainmapfile eq "" || !-f $chainmapfile) {dodie("cannot verify commandline options");}
my %newchains, %oldchains, %chainmap, %allchains;
my $ofile = "/tmp/euca_ipt_intermediate.$$";
@workingfiles = ($ofile);
open(FH, "$chainmapfile") || dodie("cannot open $chainmap");
while(<FH>) {
chomp;
my $line = $_;
if (!$line) {
next;
}
my ($chain, $net) = split(/\s+/, $line);
if ($chain && $net) {
$chainmap{$chain} = "$net";
$allchains{$chain} = 1;
}
}
close(FH);
open(FH, "$rulefile") || dodie("cannot open $rulefile");
while(<FH>) {
chomp;
my $line = $_;
if ($line =~ /^\s*RULE/) {
my ($add, $chainuser, @rule) = split(/\s+/, $line);
if ($chainuser && @rule) {
$chainuser =~ s/-//g;
chomp(my $chain = encode_base64(md5($chainuser)));
$chain = md5_base64($chainuser) . "==";
$newchains{$chain} .= ",,," . join(" ", @rule);
$allchains{$chain} = 1;
}
}
}
close(FH);
open(RFH, "iptables-save -t $table|") || dodie("iptables-save failed\n");
while(<RFH>) {
chomp;
my $line = $_;
if ($line =~ /^\s*#/) {
} elsif ($line =~ /-A/) {
my ($add, $chain, @rule) = split(/\s+/, $line);
if ($chain && @rule) {
$oldchains{$chain} .= ",,," . join(" ", @rule);
$allchains{$chain} = 1;
}
} elsif ($line =~ /^:/) {
my ($exchain) = split(/\s+/, $line);
if ($exchain && $exchain ne "") {
$exchain =~ s/://g;
$allchains{$exchain} = 1;
}
}
}
close(RFH);
$ncl = keys(%newchains);
$ocl = keys(%oldchains);
$cml = keys(%chainmap);
if ($ncl <= 0 || $ocl <= 0 || $cml <= 0) {
print STDERR "nothing to do\n";
return(0);
}
foreach $chain (keys(%newchains)) {
print STDERR "INCHAIN($chain): $newchains{$chain}\n";
my @inrules = split(',,,', $newchains{$chain});
print STDERR "INRULES: @inrules\n";
my $newchain = "";
foreach $rule (@inrules) {
my @rules = rule_convert($rule, $chainmap{$chain});
if (@rules) {
print STDERR "RULECONVERT: @rules\n";
$newchain .= ",,,$rules[0]";
}
}
print STDERR "NEWCHAIN($chain): $newchain\n";
print STDERR "OLDCHAIN($chain): $oldchains{$chain}\n";
$oldchains{$chain} = $newchain;
print STDERR "CHAINMAP($chain): $chainmap{$chain}\n\n\n";
}
print STDERR "------------------\n";
open(OFH, ">$ofile") || dodie("cannot write to file $ofile");
# write out the header
print OFH "*filter\n:INPUT ACCEPT [0:0]\n:FORWARD DROP [0:0]\n:OUTPUT ACCEPT [0:0]\n";
#write out eucalyptus chains
foreach $chain (keys(%allchains)) {
if ($chain && $chain ne "" && $chain ne "FORWARD" && $chain ne "INPUT" && $chain ne "OUTPUT" && $chain ne "PREROUTING" && $chain ne "POSTROUTING") {
print OFH ":$chain - [0:0]\n";
}
}
#restore non-eucalyptus chains
foreach $chain (keys(%oldchains)) {
if (!$chainmap{$chain}) {
my @rules = split(',,,', $oldchains{$chain});
foreach $rule (@rules) {
if ($chain && $rule && $rule ne "") {
print OFH "-A $chain $rule\n";
}
}
}
}
#install eucalyptus chains
foreach $chain (keys(%oldchains)) {
if ($chainmap{$chain}) {
my @rules = split(',,,', $oldchains{$chain});
foreach $rule (@rules) {
if ($chain && $rule && $rule ne "") {
print OFH "-A $chain $rule\n";
}
}
}
}
print OFH "COMMIT\n";
close(OFH);
if ( -f "$ofile" ) {
$rc = system("cat $ofile | iptables-restore");
if ($rc) {
print STDERR "[EUCAERROR] euca_ipt: could not run iptables-restore\n";
}
} else {
$rc = 1;
}
return($rc);
}
sub rule_convert() {
my $rule = shift @_;
my $dest = shift @_;
my ($prot, $port, $source, $sourceuser, $sourcegroup);
my $ret = "";
my @retrules;
if (!$rule || $rule eq "") {
return;
}
if ($rule =~ /-P (\S+)/) {
$prot = $1;
}
if ($rule =~ /-p (\S+)/) {
$port = $1;
my ($minport, $maxport) = split("-", $port);
if (!$maxport || ($minport eq $maxport)) {
$port = $minport;
} else {
$port =~ s/-/:/g;
}
}
if ($rule =~ /-s (\S+)/) {
$source = $1;
}
if ($rule =~ /-u (\S+)/) {
$sourceuser = "$1";
}
if ($rule =~ /-o (\S+)/) {
$sourcegroup = "$1";
}
if ($sourceuser && $sourcegroup) {
chomp($chainuser = encode_base64(md5("$sourceuser"."$sourcegroup")));
$source = $chainmap{$chainuser};
}
if ($source =~ /\d+\.\d+\.\d+\.\d+/) {
if ($source && $source ne "0.0.0.0/0") {
$ret .= "-s $source ";
}
if ($dest) {
$ret .= "-d $dest ";
}
if ($prot) {
$ret .= "-p $prot -m $prot ";
}
if ($port) {
$ret .= "--dport $port ";
}
$ret .= "-j ACCEPT";
@retrules = (@retrules, $ret);
} else {
}
return(@retrules);
}
sub doexit {
$ret = shift @_;
$msg = shift @_;
if ($msg) {
print STDERR "$msg\n";
}
for ($i=0; $i<@workingfiles; $i++) {
if ( -f "$workingfiles[$i]" ) {
unlink("$workingfiles[$i]");
}
}
exit($ret);
}
sub dodie {
$msg = shift @_;
doexit(1, "[EUCAERROR] $msg");
}
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