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shorewall_code/Shorewall-perl/compiler.pl
teastep c0e5fcf6c6 Fold IP_FORWARDING into the trivalue mechanism 
git-svn-id: https://shorewall.svn.sourceforge.net/svnroot/shorewall/trunk@6067 fbd18981-670d-0410-9b5c-8dc0c1a9a2bb
2007-04-22 19:45:27 +00:00

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#! /usr/bin/perl -w
#
# The Shoreline Firewall4 (Shorewall-perl) Packet Filtering Firewall Compiler - V3.9
#
# This program is under GPL [http://www.gnu.org/copyleft/gpl.htm]
#
# (c) 2007 - Tom Eastep (teastep@shorewall.net)
#
# Complete documentation is available at http://shorewall.net
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of Version 2 of the GNU General Public License
# as published by the Free Software Foundation.
#
# 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., 675 Mass Ave, Cambridge, MA 02139, USA
#
# Commands are:
#
# compiler.pl Verify the configuration files.
# compile <path name> Compile into <path name>
#
# Environmental Variables are set up by the Compiler wrapper ('compiler' program).
#
# EXPORT=Yes -e option specified to /sbin/shorewall
# SHOREWALL_DIR A directory name was passed to /sbin/shorewall
# VERBOSE Standard Shorewall verbosity control.
# TIMESTAMP=Yes -t option specified to /sbin/shorewall
#
# This program performs rudimentary shell variable expansion on action and macro files.
use strict;
use lib '/usr/share/shorewall-perl';
use Shorewall::Common;
use Shorewall::Config;
use Shorewall::Chains;
use Shorewall::Zones;
use Shorewall::Interfaces;
use Shorewall::Hosts;
use Shorewall::Policy;
use Shorewall::Nat;
use Shorewall::Providers;
use Shorewall::Tc;
use Shorewall::Tunnels;
use Shorewall::Macros;
use Shorewall::Actions;
use Shorewall::Accounting;
use Shorewall::Rules;
use Shorewall::Proc;
use Shorewall::Proxyarp;
my $export;
INIT {
$export = $ENV{EXPORT};
}
#
# First stage of script generation.
#
# Copy the prog.header to the generated script.
# Generate the various user-exit jacket functions.
# Generate the 'initialize()' function.
#
sub generate_script_1() {
copy $globals{SHAREDIRPL} . 'prog.header';
my $date = localtime;
emit "#\n# Compiled firewall script generated by Shorewall-perl $globals{VERSION} - $date\n#";
if ( $export ) {
emitj ( 'SHAREDIR=/usr/share/shorewall-lite',
'CONFDIR=/etc/shorewall-lite',
'VARDIR=/var/lib/shorewall-lite',
'PRODUCT="Shorewall Lite"'
);
copy "$globals{SHAREDIR}/lib.base";
emitj ( '################################################################################',
'# End of /usr/share/shorewall/lib.base',
'################################################################################'
);
} else {
emitj ( 'SHAREDIR=/usr/share/shorewall',
'CONFDIR=/etc/shorewall',
'VARDIR=/var/lib/shorewall',
'PRODUCT=\'Shorewall\'',
'. /usr/share/shorewall/lib.base'
);
}
emit "TEMPFILE=\n";
for my $exit qw/init start tcclear started stop stopped/ {
emit "run_${exit}_exit() {";
push_indent;
append_file $exit;
emit 'true';
pop_indent;
emit "}\n";
}
emitj ( 'initialize()',
'{'
);
push_indent;
if ( $export ) {
emitj ( '#',
'# These variables are required by the library functions called in this script',
'#',
'CONFIG_PATH="/etc/shorewall-lite:/usr/share/shorewall-lite"' );
} else {
emitj ( 'if [ ! -f ${SHAREDIR}/version ]; then',
' fatal_error "This script requires Shorewall which do not appear to be installed on this system (did you forget \"-e\" when you compiled?)"',
'fi',
'',
'local version=$(cat ${SHAREDIR}/version)',
'',
'if [ ${SHOREWALL_LIBVERSION:-0} -lt 30401 ]; then',
' fatal_error "This script requires Shorewall version 3.4.2 or later; current version is $version"',
'fi',
'#',
'# These variables are required by the library functions called in this script',
'#',
qq(CONFIG_PATH="$config{CONFIG_PATH}") );
}
propagateconfig;
emitj ( '[ -n "${COMMAND:=restart}" ]',
'[ -n "${VERBOSE:=0}" ]',
qq([ -n "\${RESTOREFILE:=$config{RESTOREFILE}}" ]),
'[ -n "$LOGFORMAT" ] || LOGFORMAT="Shorewall:%s:%s:"',
qq(VERSION="$globals{VERSION}") ,
qq(PATH="$config{PATH}") ,
'TERMINATOR=fatal_error'
);
if ( $config{IPTABLES} ) {
emitj( qq(IPTABLES="$config{IPTABLES}"),
'',
'[ -x "$IPTABLES" ] || startup_error "IPTABLES=$IPTABLES does not exist or is not executable"',
);
} else {
emitj( '[ -z "$IPTABLES" ] && IPTABLES=$(mywhich iptables 2> /dev/null)',
'',
'[ -n "$IPTABLES" -a -x "$IPTABLES" ] || startup_error "Can\'t find iptables executable"'
);
}
append_file 'params' if $config{EXPORTPARAMS};
emitj ( '',
"STOPPING=",
'COMMENT=', # Maintain compability with lib.base
'',
'#',
'# The library requires that ${VARDIR} exist',
'#',
'[ -d ${VARDIR} ] || mkdir -p ${VARDIR}'
);
pop_indent;
emit "}\n"; # End of initialize()
}
sub compile_stop_firewall() {
emit <<'EOF';
#
# Stop/restore the firewall after an error or because of a 'stop' or 'clear' command
#
stop_firewall() {
deletechain() {
qt $IPTABLES -L $1 -n && qt $IPTABLES -F $1 && qt $IPTABLES -X $1
}
deleteallchains() {
$IPTABLES -F
$IPTABLES -X
}
setcontinue() {
$IPTABLES -A $1 -m state --state ESTABLISHED,RELATED -j ACCEPT
}
delete_nat() {
$IPTABLES -t nat -F
$IPTABLES -t nat -X
if [ -f ${VARDIR}/nat ]; then
while read external interface; do
del_ip_addr $external $interface
done < ${VARDIR}/nat
rm -f ${VARDIR}/nat
fi
}
case $COMMAND in
stop|clear|restore)
;;
*)
set +x
case $COMMAND in
start)
logger -p kern.err "ERROR:$PRODUCT start failed"
;;
restart)
logger -p kern.err "ERROR:$PRODUCT restart failed"
;;
restore)
logger -p kern.err "ERROR:$PRODUCT restore failed"
;;
esac
if [ "$RESTOREFILE" = NONE ]; then
COMMAND=clear
clear_firewall
echo "$PRODUCT Cleared"
kill $$
exit 2
else
RESTOREPATH=${VARDIR}/$RESTOREFILE
if [ -x $RESTOREPATH ]; then
if [ -x ${RESTOREPATH}-ipsets ]; then
progress_message2 Restoring Ipsets...
#
# We must purge iptables to be sure that there are no
# references to ipsets
#
for table in mangle nat filter; do
$IPTABLES -t $table -F
$IPTABLES -t $table -X
done
${RESTOREPATH}-ipsets
fi
echo Restoring ${PRODUCT:=Shorewall}...
if $RESTOREPATH restore; then
echo "$PRODUCT restored from $RESTOREPATH"
set_state "Started"
else
set_state "Unknown"
fi
kill $$
exit 2
fi
fi
;;
esac
set_state "Stopping"
STOPPING="Yes"
TERMINATOR=
deletechain shorewall
determine_capabilities
run_stop_exit;
if [ -n "$MANGLE_ENABLED" ]; then
run_iptables -t mangle -F
run_iptables -t mangle -X
for chain in PREROUTING INPUT FORWARD POSTROUTING; do
qt $IPTABLES -t mangle -P $chain ACCEPT
done
fi
if [ -n "$RAW_TABLE" ]; then
run_iptables -t raw -F
run_iptables -t raw -X
for chain in PREROUTING OUTPUT; do
qt $IPTABLES -t raw -P $chain ACCEPT
done
fi
if [ -n "$NAT_ENABLED" ]; then
delete_nat
for chain in PREROUTING POSTROUTING OUTPUT; do
qt $IPTABLES -t nat -P $chain ACCEPT
done
fi
if [ -f ${VARDIR}/proxyarp ]; then
while read address interface external haveroute; do
qt arp -i $external -d $address pub
[ -z "${haveroute}${NOROUTES}" ] && qt ip route del $address dev $interface
done < ${VARDIR}/proxyarp
for f in /proc/sys/net/ipv4/conf/*; do
[ -f $f/proxy_arp ] && echo 0 > $f/proxy_arp
done
fi
rm -f ${VARDIR}/proxyarp
EOF
push_indent;
emit 'delete_tc1' if $config{CLEAR_TC};
emitj( 'undo_routing',
'restore_default_route'
);
my $criticalhosts = process_criticalhosts;
if ( @$criticalhosts ) {
if ( $config{ADMINISABSENTMINDED} ) {
emitj ( 'for chain in INPUT OUTPUT; do',
' setpolicy $chain ACCEPT',
'done',
'',
'setpolicy FORWARD DROP',
'',
'deleteallchains',
''
);
for my $hosts ( @$criticalhosts ) {
my ( $interface, $host ) = ( split /:/, $hosts );
my $source = match_source_net $host;
my $dest = match_dest_net $host;
emitj( "\$IPTABLES -A INPUT -i $interface $source -j ACCEPT",
"\$IPTABLES -A OUTPUT -o $interface $dest -j ACCEPT"
);
}
emitj( '',
'for chain in INPUT OUTPUT; do',
' setpolicy $chain DROP',
"done\n"
);
} else {
emitj( '',
'for chain in INPUT OUTPUT; do',
' setpolicy \$chain ACCEPT',
'done',
'',
'setpolicy FORWARD DROP',
'',
"deleteallchains\n"
);
for my $hosts ( @$criticalhosts ) {
my ( $interface, $host ) = ( split /:/, $hosts );
my $source = match_source_net $host;
my $dest = match_dest_net $host;
emitj( "\$IPTABLES -A INPUT -i $interface $source -j ACCEPT",
"\$IPTABLES -A OUTPUT -o $interface $dest -j ACCEPT"
);
}
emitj ( "\nsetpolicy INPUT DROP",
'',
'for chain in INPUT FORWARD; do',
' setcontinue $chain',
"done\n"
);
}
} elsif ( $config{ADMINISABSENTMINDED} ) {
emitj( 'for chain in INPUT FORWARD; do',
' setpolicy $chain DROP',
'done',
'',
'setpolicy OUTPUT ACCEPT',
'',
'deleteallchains',
'',
'for chain in INPUT FORWARD; do',
' setcontinue $chain',
"done\n",
);
} else {
emitj( 'for chain in INPUT OUTPUT FORWARD; do',
' setpolicy $chain DROP',
'done',
'',
"deleteallchains\n"
);
}
process_routestopped;
emitj( '$IPTABLES -A INPUT -i lo -j ACCEPT',
'$IPTABLES -A OUTPUT -o lo -j ACCEPT'
);
emit '$IPTABLES -A OUTPUT -o lo -j ACCEPT' unless $config{ADMINISABSENTMINDED};
my $interfaces = find_interfaces_by_option 'dhcp';
for my $interface ( @$interfaces ) {
emit "\$IPTABLES -A INPUT -p udp -i $interface --dport 67:68 -j ACCEPT";
emit "\$IPTABLES -A OUTPUT -p udp -o $interface --dport 67:68 -j ACCEPT" unless $config{ADMINISABSENTMINDED};
#
# This might be a bridge
#
emit "\$IPTABLES -A FORWARD -p udp -i $interface -o $interface --dport 67:68 -j ACCEPT";
}
emit '';
if ( $config{IP_FORWARDING} eq 'on' ) {
emitj( 'echo 1 > /proc/sys/net/ipv4/ip_forward',
'progress_message2 IP Forwarding Enabled' );
} elsif ( $config{IP_FORWARDING} eq 'off' ) {
emitj( 'echo 0 > /proc/sys/net/ipv4/ip_forward',
'progress_message2 IP Forwarding Disabled!'
);
}
emit 'run_stopped_exit';
pop_indent;
emit '
set_state "Stopped"
logger -p kern.info "$PRODUCT Stopped"
case $COMMAND in
stop|clear)
;;
*)
#
# The firewall is being stopped when we were trying to do something
# else. Kill the shell in case we\'re running in a subshell
#
kill $$
;;
esac
}
';
}
#
# Second Phase of Script Generation
#
# copies the 'prog.functions' file into the script
# generates the first part of 'setup_routing_and_traffic_shaping()'
#
# The bulk of that function is produced by the various config file
# parsing routines that are called directly out of 'compiler()'.
#
sub generate_script_2 () {
copy $globals{SHAREDIRPL} . 'prog.functions';
emitj( '#',
'# Setup Routing and Traffic Shaping',
'#',
'setup_routing_and_traffic_shaping() {'
);
push_indent;
emit 'local restore_file=$1';
save_progress_message 'Initializing...';
if ( $export ) {
my $fn = find_file 'modules';
if ( $fn ne "$globals{SHAREDIR}/modules" && -f $fn ) {
emit 'echo MODULESDIR="$MODULESDIR" > ${VARDIR}/.modulesdir';
emit 'cat > ${VARDIR}/.modules << EOF';
open_file $fn;
while ( read_a_line ) {
emit_unindented $line;
}
emit_unindented 'EOF';
emit 'reload_kernel_modules < ${VARDIR}/.modules';
} else {
emit 'load_kernel_modules Yes';
}
} else {
emit 'load_kernel_modules Yes';
}
emit '';
for my $interface ( @{find_interfaces_by_option 'norfc1918'} ) {
emitj ( "addr=\$(ip -f inet addr show $interface 2> /dev/null | grep 'inet\ ' | head -n1)",
'if [ -n "$addr" ]; then',
' addr=$(echo $addr | sed \'s/inet //;s/\/.*//;s/ peer.*//\')',
' for network in 10.0.0.0/8 176.16.0.0/12 192.168.0.0/16; do',
' if in_network $addr $network; then',
" error_message \"WARNING: The 'norfc1918' option has been specified on an interface with an RFC 1918 address. Interface:$interface\"",
' fi',
' done',
"fi\n" );
}
emitj ( 'run_init_exit',
'',
'qt $IPTABLES -L shorewall -n && qt $IPTABLES -F shorewall && qt $IPTABLES -X shorewall',
'',
'delete_proxyarp',
''
);
emit "delete_tc1\n" if $config{CLEAR_TC};
emit "disable_ipv6\n" if $config{DISABLE_IPV6};
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<<'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 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 = $_[0];
report_capabilities if $verbose > 1;
require_capability( 'MULTIPORT' , "Shorewall-perl $globals{VERSION}" );
require_capability( 'ADDRTYPE' , "Shorewall-perl $globals{VERSION}" );
require_capability( 'RECENT_MATCH' , 'MACLIST_TTL' ) if $config{MACLIST_TTL};
require_capability( 'XCONNMARK' , 'HIGH_ROUTE_MARKS=Yes' ) if $config{HIGH_ROUTE_MARKS};
require_capability( 'MANGLE_ENABLED' , 'Traffic Shaping' ) if $config{TC_ENABLED};
require_capability( 'CONNTRACK_MATCH' , 'RFC1918_STRICT=Yes' ) if $config{RFC1918_STRICT};
( $command, $doing, $done ) = qw/ check Checking Checked / unless $objectfile;
initialize_chain_table;
if ( $command eq 'compile' ) {
create_temp_object( $objectfile );
generate_script_1;
}
#
# Process the zones file.
#
determine_zones;
#
# Process the interfaces file.
#
validate_interfaces_file;
#
# Process the hosts file.
#
validate_hosts_file;
#
# Report zone contents
#
progress_message2 "Determining Hosts in Zones...";
zone_report;
#
# Do action pre-processing.
#
progress_message2 "Preprocessing Action Files...";
process_actions1;
#
# Process the Policy File.
#
validate_policy;
#
# Compile the 'stop_firewall()' function
#
compile_stop_firewall;
#
# Start Second Part of script
#
generate_script_2;
#
# Do all of the zone-independent stuff
#
add_common_rules;
#
# /proc stuff
#
setup_arp_filtering;
setup_route_filtering;
setup_martian_logging;
setup_source_routing;
setup_forwarding;
#
# Proxy Arp
#
setup_proxy_arp;
#
# [Re-]establish Routing
#
setup_providers;
#
# TOS
#
process_tos;
#
# ECN
#
setup_ecn;
#
# Setup Masquerading/SNAT
#
setup_masq;
#
# MACLIST Filtration
#
progress_message2 "$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;
}
}
#
# E x e c u t i o n S t a r t s H e r e
#
#
# Get shorewall.conf and capabilities.
#
get_configuration( $export );
#
# Compile/Check the configuration.
#
compiler $ARGV[0];
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