forked from extern/shorewall_code
6bfe25e0e8
git-svn-id: https://shorewall.svn.sourceforge.net/svnroot/shorewall/trunk@6758 fbd18981-670d-0410-9b5c-8dc0c1a9a2bb
847 lines
20 KiB
Perl
847 lines
20 KiB
Perl
#! /usr/bin/perl -w
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#
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# The Shoreline Firewall4 (Shorewall-perl) Packet Filtering Firewall Compiler - V4.0
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#
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# This program is under GPL [http://www.gnu.org/copyleft/gpl.htm]
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#
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# (c) 2007 - Tom Eastep (teastep@shorewall.net)
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#
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# Complete documentation is available at http://shorewall.net
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of Version 2 of the GNU General Public License
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# as published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA
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#
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package Shorewall::Compiler;
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require Exporter;
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use Shorewall::Common;
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use Shorewall::Config;
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use Shorewall::Chains;
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use Shorewall::Zones;
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use Shorewall::Interfaces;
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use Shorewall::Hosts;
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use Shorewall::Policy;
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use Shorewall::Nat;
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use Shorewall::Providers;
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use Shorewall::Tc;
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use Shorewall::Tunnels;
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use Shorewall::Macros;
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use Shorewall::Actions;
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use Shorewall::Accounting;
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use Shorewall::Rules;
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use Shorewall::Proc;
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use Shorewall::Proxyarp;
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our @ISA = qw(Exporter);
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our @EXPORT = qw( compiler EXPORT TIMESTAMP DEBUG );
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our @EXPORT_OK = qw( $export );
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our $VERSION = 4.00;
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our $export;
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our $reused = 0;
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use constant { EXPORT => 0x01 ,
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TIMESTAMP => 0x02 ,
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DEBUG => 0x04 };
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#
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# Reinitilize the package-globals in the other modules
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#
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sub reinitialize() {
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Shorewall::Common::initialize;
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Shorewall::Config::initialize;
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Shorewall::Chains::initialize;
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Shorewall::Zones::initialize;
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Shorewall::Interfaces::initialize;
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Shorewall::Nat::initialize;
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Shorewall::Providers::initialize;
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Shorewall::Tc::initialize;
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Shorewall::Macros::initialize;
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Shorewall::Actions::initialize;
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Shorewall::Accounting::initialize;
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Shorewall::Rules::initialize;
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Shorewall::Proxyarp::initialize;
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}
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#
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# First stage of script generation.
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#
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# Copy the prog.header to the generated script.
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# Generate the various user-exit jacket functions.
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# Generate the 'initialize()' function.
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#
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sub generate_script_1() {
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copy $globals{SHAREDIRPL} . 'prog.header';
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my $date = localtime;
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emit "#\n# Compiled firewall script generated by Shorewall-perl $globals{VERSION} - $date\n#";
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if ( $export ) {
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emitj ( 'SHAREDIR=/usr/share/shorewall-lite',
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'CONFDIR=/etc/shorewall-lite',
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'VARDIR=/var/lib/shorewall-lite',
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'PRODUCT="Shorewall Lite"'
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);
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} else {
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emitj ( 'SHAREDIR=/usr/share/shorewall',
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'CONFDIR=/etc/shorewall',
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'VARDIR=/var/lib/shorewall',
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'PRODUCT=\'Shorewall\'',
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);
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}
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emit "TEMPFILE=\n";
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for my $exit qw/init start tcclear started stop stopped clear/ {
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emit "run_${exit}_exit() {";
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push_indent;
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append_file $exit or emit 'true';
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pop_indent;
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emit "}\n";
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}
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emitj ( 'initialize()',
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'{',
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' #',
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' # These variables are required by the library functions called in this script',
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' #'
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);
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push_indent;
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if ( $export ) {
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emit ( 'CONFIG_PATH="/etc/shorewall-lite:/usr/share/shorewall-lite"' );
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} else {
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emit ( qq(CONFIG_PATH="$config{CONFIG_PATH}") );
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}
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propagateconfig;
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emitj ( '[ -n "${COMMAND:=restart}" ]',
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'[ -n "${VERBOSE:=0}" ]',
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qq([ -n "\${RESTOREFILE:=$config{RESTOREFILE}}" ]),
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'[ -n "$LOGFORMAT" ] || LOGFORMAT="Shorewall:%s:%s:"',
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qq(VERSION="$globals{VERSION}") ,
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qq(PATH="$config{PATH}") ,
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'TERMINATOR=fatal_error'
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);
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if ( $config{IPTABLES} ) {
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emitj( qq(IPTABLES="$config{IPTABLES}"),
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'',
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'[ -x "$IPTABLES" ] || startup_error "IPTABLES=$IPTABLES does not exist or is not executable"',
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);
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} else {
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emitj( '[ -z "$IPTABLES" ] && IPTABLES=$(mywhich iptables 2> /dev/null)',
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'',
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'[ -n "$IPTABLES" -a -x "$IPTABLES" ] || startup_error "Can\'t find iptables executable"'
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);
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}
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emitj( 'IPTABLES_RESTORE=${IPTABLES}-restore',
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'[ -x "$IPTABLES_RESTORE" ] || startup_error "$IPTABLES_RESTORE does not exist or is not executable"' );
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append_file 'params' if $config{EXPORTPARAMS};
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emitj ( '',
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"STOPPING=",
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'COMMENT=', # Maintain compability with lib.base
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'',
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'#',
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'# The library requires that ${VARDIR} exist',
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'#',
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'[ -d ${VARDIR} ] || mkdir -p ${VARDIR}'
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);
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pop_indent;
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emit "}\n"; # End of initialize()
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}
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sub compile_stop_firewall() {
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emit <<'EOF';
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#
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# Stop/restore the firewall after an error or because of a 'stop' or 'clear' command
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#
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stop_firewall() {
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deletechain() {
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qt $IPTABLES -L $1 -n && qt $IPTABLES -F $1 && qt $IPTABLES -X $1
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}
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deleteallchains() {
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$IPTABLES -F
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$IPTABLES -X
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}
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setcontinue() {
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$IPTABLES -A $1 -m state --state ESTABLISHED,RELATED -j ACCEPT
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}
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delete_nat() {
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$IPTABLES -t nat -F
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$IPTABLES -t nat -X
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if [ -f ${VARDIR}/nat ]; then
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while read external interface; do
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del_ip_addr $external $interface
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done < ${VARDIR}/nat
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rm -f ${VARDIR}/nat
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fi
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}
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case $COMMAND in
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stop|clear|restore)
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;;
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*)
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set +x
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case $COMMAND in
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start)
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logger -p kern.err "ERROR:$PRODUCT start failed"
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;;
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restart)
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logger -p kern.err "ERROR:$PRODUCT restart failed"
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;;
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restore)
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logger -p kern.err "ERROR:$PRODUCT restore failed"
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;;
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esac
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if [ "$RESTOREFILE" = NONE ]; then
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COMMAND=clear
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clear_firewall
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echo "$PRODUCT Cleared"
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kill $$
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exit 2
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else
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RESTOREPATH=${VARDIR}/$RESTOREFILE
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if [ -x $RESTOREPATH ]; then
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if [ -x ${RESTOREPATH}-ipsets ]; then
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progress_message2 Restoring Ipsets...
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#
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# We must purge iptables to be sure that there are no
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# references to ipsets
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#
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for table in mangle nat filter; do
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$IPTABLES -t $table -F
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$IPTABLES -t $table -X
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done
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${RESTOREPATH}-ipsets
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fi
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echo Restoring ${PRODUCT:=Shorewall}...
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if $RESTOREPATH restore; then
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echo "$PRODUCT restored from $RESTOREPATH"
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set_state "Started"
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else
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set_state "Unknown"
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fi
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kill $$
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exit 2
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fi
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fi
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;;
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esac
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set_state "Stopping"
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STOPPING="Yes"
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TERMINATOR=
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deletechain shorewall
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run_stop_exit;
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EOF
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if ( $capabilities{MANGLE_ENABLED} ) {
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emit <<'EOF';
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run_iptables -t mangle -F
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run_iptables -t mangle -X
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for chain in PREROUTING INPUT FORWARD POSTROUTING; do
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qt $IPTABLES -t mangle -P $chain ACCEPT
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done
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EOF
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}
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if ( $capabilities{RAW_TABLE} ) {
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emit <<'EOF';
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run_iptables -t raw -F
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run_iptables -t raw -X
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for chain in PREROUTING OUTPUT; do
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qt $IPTABLES -t raw -P $chain ACCEPT
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done
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EOF
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}
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if ( $capabilities{NAT_ENABLED} ) {
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emit <<'EOF';
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delete_nat
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for chain in PREROUTING POSTROUTING OUTPUT; do
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qt $IPTABLES -t nat -P $chain ACCEPT
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done
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EOF
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}
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emit <<'EOF';
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if [ -f ${VARDIR}/proxyarp ]; then
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while read address interface external haveroute; do
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qt arp -i $external -d $address pub
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[ -z "${haveroute}${NOROUTES}" ] && qt ip route del $address dev $interface
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done < ${VARDIR}/proxyarp
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for f in /proc/sys/net/ipv4/conf/*; do
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[ -f $f/proxy_arp ] && echo 0 > $f/proxy_arp
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done
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fi
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rm -f ${VARDIR}/proxyarp
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EOF
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push_indent;
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emit 'delete_tc1' if $config{CLEAR_TC};
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emitj( 'undo_routing',
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'restore_default_route'
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);
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my $criticalhosts = process_criticalhosts;
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if ( @$criticalhosts ) {
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if ( $config{ADMINISABSENTMINDED} ) {
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emitj ( 'for chain in INPUT OUTPUT; do',
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' setpolicy $chain ACCEPT',
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'done',
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'',
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'setpolicy FORWARD DROP',
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'',
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'deleteallchains',
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''
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);
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for my $hosts ( @$criticalhosts ) {
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my ( $interface, $host ) = ( split /:/, $hosts );
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my $source = match_source_net $host;
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my $dest = match_dest_net $host;
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emitj( "\$IPTABLES -A INPUT -i $interface $source -j ACCEPT",
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"\$IPTABLES -A OUTPUT -o $interface $dest -j ACCEPT"
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);
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}
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emitj( '',
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'for chain in INPUT OUTPUT; do',
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' setpolicy $chain DROP',
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"done\n"
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);
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} else {
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emitj( '',
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'for chain in INPUT OUTPUT; do',
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' setpolicy \$chain ACCEPT',
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'done',
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'',
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'setpolicy FORWARD DROP',
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'',
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"deleteallchains\n"
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);
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for my $hosts ( @$criticalhosts ) {
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my ( $interface, $host ) = ( split /:/, $hosts );
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my $source = match_source_net $host;
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my $dest = match_dest_net $host;
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emitj( "\$IPTABLES -A INPUT -i $interface $source -j ACCEPT",
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"\$IPTABLES -A OUTPUT -o $interface $dest -j ACCEPT"
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);
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}
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emitj ( "\nsetpolicy INPUT DROP",
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'',
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'for chain in INPUT FORWARD; do',
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' setcontinue $chain',
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"done\n"
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);
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}
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} elsif ( $config{ADMINISABSENTMINDED} ) {
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emitj( 'for chain in INPUT FORWARD; do',
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' setpolicy $chain DROP',
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'done',
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'',
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'setpolicy OUTPUT ACCEPT',
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'',
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'deleteallchains',
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'',
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'for chain in INPUT FORWARD; do',
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' setcontinue $chain',
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"done\n",
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);
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} else {
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emitj( 'for chain in INPUT OUTPUT FORWARD; do',
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' setpolicy $chain DROP',
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'done',
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'',
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"deleteallchains\n"
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);
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}
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process_routestopped;
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emitj( '$IPTABLES -A INPUT -i lo -j ACCEPT',
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'$IPTABLES -A OUTPUT -o lo -j ACCEPT'
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);
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emit '$IPTABLES -A OUTPUT -o lo -j ACCEPT' unless $config{ADMINISABSENTMINDED};
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my $interfaces = find_interfaces_by_option 'dhcp';
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for my $interface ( @$interfaces ) {
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emit "\$IPTABLES -A INPUT -p udp -i $interface --dport 67:68 -j ACCEPT";
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emit "\$IPTABLES -A OUTPUT -p udp -o $interface --dport 67:68 -j ACCEPT" unless $config{ADMINISABSENTMINDED};
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#
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# This might be a bridge
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#
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emit "\$IPTABLES -A FORWARD -p udp -i $interface -o $interface --dport 67:68 -j ACCEPT";
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}
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emit '';
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if ( $config{IP_FORWARDING} eq 'on' ) {
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emitj( 'echo 1 > /proc/sys/net/ipv4/ip_forward',
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'progress_message2 IP Forwarding Enabled' );
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} elsif ( $config{IP_FORWARDING} eq 'off' ) {
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emitj( 'echo 0 > /proc/sys/net/ipv4/ip_forward',
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'progress_message2 IP Forwarding Disabled!'
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);
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}
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emit 'run_stopped_exit';
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pop_indent;
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emit '
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set_state "Stopped"
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logger -p kern.info "$PRODUCT Stopped"
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case $COMMAND in
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stop|clear)
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;;
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*)
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#
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# The firewall is being stopped when we were trying to do something
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# else. Kill the shell in case we\'re running in a subshell
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#
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kill $$
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;;
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esac
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}
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';
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}
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#
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# Second Phase of Script Generation
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#
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# copies the 'prog.functions' file into the script, generates
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# clear_routing_and_traffic_shaping() and the first part of
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# 'setup_routing_and_traffic_shaping()'
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#
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# The bulk of that function is produced by the various config file
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# parsing routines that are called directly out of 'compiler()'.
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#
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# We create two separate functions rather than one so that the
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# define_firewall() shell can set global IP configuration variables
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# after the old config has been cleared and before we start instantiating
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# the new config. That way, the variables reflect the way that the
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# distribution's tools have configured IP without any Shorewall
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# modifications.
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#
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sub generate_script_2 () {
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copy $globals{SHAREDIRPL} . 'prog.functions';
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emitj( '',
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'#',
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'# Clear Routing and Traffic Shaping',
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'#',
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'clear_routing_and_traffic_shaping() {'
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);
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push_indent;
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save_progress_message 'Initializing...';
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if ( $export ) {
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my $fn = find_file 'modules';
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if ( $fn ne "$globals{SHAREDIR}/modules" && -f $fn ) {
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emit 'echo MODULESDIR="$MODULESDIR" > ${VARDIR}/.modulesdir';
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emit 'cat > ${VARDIR}/.modules << EOF';
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open_file $fn;
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while ( read_a_line ) {
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emit_unindented $line;
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}
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emit_unindented 'EOF';
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emit 'reload_kernel_modules < ${VARDIR}/.modules';
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} else {
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emit 'load_kernel_modules Yes';
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}
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} else {
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emit 'load_kernel_modules Yes';
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}
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emit '';
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for my $interface ( @{find_interfaces_by_option 'norfc1918'} ) {
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emitj ( "addr=\$(ip -f inet addr show $interface 2> /dev/null | grep 'inet\ ' | head -n1)",
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'if [ -n "$addr" ]; then',
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' addr=$(echo $addr | sed \'s/inet //;s/\/.*//;s/ peer.*//\')',
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' for network in 10.0.0.0/8 176.16.0.0/12 192.168.0.0/16; do',
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' if in_network $addr $network; then',
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" error_message \"WARNING: The 'norfc1918' option has been specified on an interface with an RFC 1918 address. Interface:$interface\"",
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' fi',
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' done',
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"fi\n" );
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}
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emitj ( 'run_init_exit',
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'',
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'qt $IPTABLES -L shorewall -n && qt $IPTABLES -F shorewall && qt $IPTABLES -X shorewall',
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'',
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'delete_proxyarp',
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''
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);
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if ( $capabilities{NAT_ENABLED} ) {
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emitj( 'if [ -f ${VARDIR}/nat ]; then',
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' while read external interface; do',
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' del_ip_addr $external $interface',
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' done < ${VARDIR}/nat',
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'',
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' rm -f ${VARDIR}/nat',
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"fi\n" );
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}
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emit "delete_tc1\n" if $config{CLEAR_TC};
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emit "disable_ipv6\n" if $config{DISABLE_IPV6};
|
|
|
|
pop_indent;
|
|
|
|
emit "}\n";
|
|
|
|
emitj( '#',
|
|
'# Setup Routing and Traffic Shaping',
|
|
'#',
|
|
'setup_routing_and_traffic_shaping() {'
|
|
);
|
|
|
|
push_indent;
|
|
|
|
setup_mss( $config{CLAMPMSS} ) if $config{CLAMPMSS};
|
|
|
|
}
|
|
|
|
#
|
|
# Third (final) stage of script generation.
|
|
#
|
|
# Generate the end of 'setup_routing_and_traffic_shaping()':
|
|
# Generate code for loading the various files in /var/lib/shorewall[-lite]
|
|
# Generate code to add IP addresses under ADD_IP_ALIASES and ADD_SNAT_ALIASES
|
|
#
|
|
# Generate the 'setup_netfilter()' function that runs iptables-restore.
|
|
# Generate the 'define_firewall()' function.
|
|
#
|
|
sub generate_script_3() {
|
|
|
|
emit 'cat > ${VARDIR}/proxyarp << __EOF__';
|
|
dump_proxy_arp;
|
|
emit_unindented '__EOF__';
|
|
|
|
emit 'cat > ${VARDIR}/chains << __EOF__';
|
|
dump_rule_chains;
|
|
emit_unindented '__EOF__';
|
|
|
|
emit 'cat > ${VARDIR}/zones << __EOF__';
|
|
dump_zone_contents;
|
|
emit_unindented '__EOF__';
|
|
|
|
emit '> ${VARDIR}/nat';
|
|
|
|
add_addresses;
|
|
|
|
pop_indent;
|
|
|
|
emit "}\n";
|
|
|
|
progress_message2 "Creating iptables-restore input...";
|
|
create_netfilter_load;
|
|
|
|
emit "#\n# Start/Restart the Firewall\n#";
|
|
emit 'define_firewall() {';
|
|
push_indent;
|
|
|
|
emit "\nclear_routing_and_traffic_shaping";
|
|
|
|
set_global_variables;
|
|
|
|
emit '';
|
|
|
|
emit<<'EOF';
|
|
setup_routing_and_traffic_shaping
|
|
|
|
if [ $COMMAND = restore ]; then
|
|
iptables_save_file=${VARDIR}/$(basename $0)-iptables
|
|
if [ -f $iptables_save_file ]; then
|
|
iptables-restore < $iptables_save_file
|
|
else
|
|
fatal_error "$iptables_save_file does not exist"
|
|
fi
|
|
set_state "Started"
|
|
else
|
|
setup_netfilter
|
|
restore_dynamic_rules
|
|
run_start_exit
|
|
$IPTABLES -N shorewall
|
|
set_state "Started"
|
|
run_started_exit
|
|
|
|
cp -f $(my_pathname) ${VARDIR}/.restore
|
|
fi
|
|
|
|
date > ${VARDIR}/restarted
|
|
|
|
case $COMMAND in
|
|
start)
|
|
logger -p kern.info "$PRODUCT started"
|
|
;;
|
|
restart)
|
|
logger -p kern.info "$PRODUCT restarted"
|
|
;;
|
|
refresh)
|
|
logger -p kern.info "$PRODUCT refreshed"
|
|
;;
|
|
restore)
|
|
logger -p kern.info "$PRODUCT restored"
|
|
;;
|
|
esac
|
|
EOF
|
|
|
|
pop_indent;
|
|
|
|
emit "}\n";
|
|
|
|
copy $globals{SHAREDIRPL} . 'prog.footer';
|
|
}
|
|
|
|
#
|
|
# The Compiler.
|
|
#
|
|
# If the first argument is non-null, it names the script file to generate.
|
|
# Otherwise, this is a 'check' command and no script is produced.
|
|
#
|
|
sub compiler( $$$$ ) {
|
|
|
|
my ( $objectfile, $directory, $verbosity, $options ) = @_;
|
|
|
|
$export = 0;
|
|
|
|
reinitialize if $reused++;
|
|
|
|
if ( $directory ne '' ) {
|
|
fatal_error "$directory is not an existing directory" unless -d $directory;
|
|
set_shorewall_dir( $directory );
|
|
}
|
|
|
|
set_verbose( $verbosity ) unless $verbosity eq '';
|
|
$export = 1 if $options & EXPORT;
|
|
set_timestamp( 1 ) if $options & TIMESTAMP;
|
|
set_debug( 1 ) if $options & DEBUG;
|
|
#
|
|
# Get shorewall.conf and capabilities.
|
|
#
|
|
get_configuration( $export );
|
|
|
|
report_capabilities if $verbose > 1;
|
|
|
|
require_capability( 'MULTIPORT' , "Shorewall-perl $globals{VERSION}" , 's' );
|
|
require_capability( 'ADDRTYPE' , "Shorewall-perl $globals{VERSION}" , 's' );
|
|
require_capability( 'RECENT_MATCH' , 'MACLIST_TTL' , 's' ) if $config{MACLIST_TTL};
|
|
require_capability( 'XCONNMARK' , 'HIGH_ROUTE_MARKS=Yes' , 's' ) if $config{HIGH_ROUTE_MARKS};
|
|
require_capability( 'MANGLE_ENABLED' , 'Traffic Shaping' , 's' ) if $config{TC_ENABLED};
|
|
require_capability( 'CONNTRACK_MATCH' , 'RFC1918_STRICT=Yes' , 's' ) if $config{RFC1918_STRICT};
|
|
|
|
( $command, $doing, $done ) = qw/ check Checking Checked / unless $objectfile;
|
|
|
|
initialize_chain_table;
|
|
|
|
if ( $command eq 'compile' ) {
|
|
create_temp_object( $objectfile );
|
|
generate_script_1;
|
|
}
|
|
|
|
#
|
|
# Process the zones file.
|
|
#
|
|
determine_zones;
|
|
#
|
|
# Process the interfaces file.
|
|
#
|
|
validate_interfaces_file ( $export );
|
|
#
|
|
# Process the hosts file.
|
|
#
|
|
validate_hosts_file;
|
|
#
|
|
# Report zone contents
|
|
#
|
|
progress_message2 "Determining Hosts in Zones...";
|
|
zone_report;
|
|
#
|
|
# Do action pre-processing.
|
|
#
|
|
progress_message2 "Preprocessing Action Files...";
|
|
process_actions1;
|
|
#
|
|
# Process the Policy File.
|
|
#
|
|
validate_policy;
|
|
#
|
|
# Compile the 'stop_firewall()' function
|
|
#
|
|
compile_stop_firewall;
|
|
#
|
|
# Start Second Part of script
|
|
#
|
|
generate_script_2;
|
|
#
|
|
# Do all of the zone-independent stuff
|
|
#
|
|
add_common_rules;
|
|
#
|
|
# /proc stuff
|
|
#
|
|
setup_arp_filtering;
|
|
setup_route_filtering;
|
|
setup_martian_logging;
|
|
setup_source_routing;
|
|
setup_forwarding;
|
|
#
|
|
# Proxy Arp
|
|
#
|
|
setup_proxy_arp;
|
|
#
|
|
# Handle MSS setings in the zones file
|
|
#
|
|
setup_zone_mss;
|
|
#
|
|
# [Re-]establish Routing
|
|
#
|
|
setup_providers;
|
|
#
|
|
# TOS
|
|
#
|
|
process_tos;
|
|
#
|
|
# ECN
|
|
#
|
|
setup_ecn;
|
|
#
|
|
# Setup Masquerading/SNAT
|
|
#
|
|
setup_masq;
|
|
#
|
|
# MACLIST Filtration
|
|
#
|
|
progress_message2 "$doing MAC Filtration -- Phase 1...";
|
|
setup_mac_lists 1;
|
|
#
|
|
# Process the rules file.
|
|
#
|
|
process_rules;
|
|
#
|
|
# Add Tunnel rules.
|
|
#
|
|
setup_tunnels;
|
|
#
|
|
# Post-rules action processing.
|
|
#
|
|
process_actions2;
|
|
process_actions3;
|
|
#
|
|
# MACLIST Filtration again
|
|
#
|
|
progress_message2 "$doing MAC Filtration -- Phase 2...";
|
|
setup_mac_lists 2;
|
|
#
|
|
# Apply Policies
|
|
#
|
|
progress_message2 'Applying Policies...';
|
|
apply_policy_rules;
|
|
#
|
|
# TCRules and Traffic Shaping
|
|
#
|
|
setup_tc;
|
|
#
|
|
# Setup Nat
|
|
#
|
|
setup_nat;
|
|
#
|
|
# Setup NETMAP
|
|
#
|
|
setup_netmap;
|
|
#
|
|
# Accounting.
|
|
#
|
|
setup_accounting;
|
|
|
|
progress_message2 'Generating Rule Matrix...';
|
|
generate_matrix;
|
|
generate_script_3;
|
|
|
|
if ( $command eq 'check' ) {
|
|
progress_message3 "Shorewall configuration verified";
|
|
} else {
|
|
#
|
|
# Finish the script.
|
|
#
|
|
finalize_object ( $export );
|
|
#
|
|
# And generate the auxilary config file
|
|
#
|
|
generate_aux_config if $export;
|
|
}
|
|
|
|
1;
|
|
}
|
|
|
|
1;
|