Combine the Policy and Rules modules

This commit is contained in:
Tom Eastep 2011-02-20 11:28:47 -08:00
parent 052bc87bd5
commit c03caf7c2f
4 changed files with 528 additions and 587 deletions

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@ -27,7 +27,6 @@ require Exporter;
use Shorewall::Config qw(:DEFAULT :internal);
use Shorewall::Chains qw(:DEFAULT :internal);
use Shorewall::Zones;
use Shorewall::Policy;
use Shorewall::Nat;
use Shorewall::Providers;
use Shorewall::Tc;
@ -43,7 +42,7 @@ use Shorewall::Misc;
our @ISA = qw(Exporter);
our @EXPORT = qw( compiler );
our @EXPORT_OK = qw( $export );
our $VERSION = '4.4_17';
our $VERSION = '4.4_18';
our $export;
@ -58,7 +57,6 @@ sub initialize_package_globals() {
Shorewall::Config::initialize($family);
Shorewall::Chains::initialize ($family);
Shorewall::Zones::initialize ($family);
Shorewall::Policy::initialize;
Shorewall::Nat::initialize;
Shorewall::Providers::initialize($family);
Shorewall::Tc::initialize($family);

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@ -30,7 +30,7 @@ use Shorewall::Config qw(:DEFAULT :internal);
use Shorewall::IPAddrs;
use Shorewall::Zones;
use Shorewall::Chains qw(:DEFAULT :internal);
use Shorewall::Policy;
use Shorewall::Rules;
use Shorewall::Proc;
use strict;
@ -45,7 +45,7 @@ our @EXPORT = qw( process_tos
generate_matrix
);
our @EXPORT_OK = qw( initialize );
our $VERSION = '4.4_16';
our $VERSION = '4.4_18';
our $family;

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@ -1,564 +0,0 @@
#
# Shorewall 4.4 -- /usr/share/shorewall/Shorewall/Policy.pm
#
# This program is under GPL [http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt]
#
# (c) 2007,2008,2009,2010 - 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
# This module deals with the /etc/shorewall/policy file.
#
package Shorewall::Policy;
require Exporter;
use Shorewall::Config qw(:DEFAULT :internal);
use Shorewall::Zones;
use Shorewall::Chains qw( :DEFAULT :internal) ;
use strict;
our @ISA = qw(Exporter);
our @EXPORT = qw( validate_policy apply_policy_rules complete_standard_chain setup_syn_flood_chains save_policies optimize_policy_chains policy_actions );
our @EXPORT_OK = qw( );
our $VERSION = '4.4_16';
# @policy_chains is a list of references to policy chains in the filter table
our @policy_chains;
our %policy_actions;
our %default_actions;
#
# Called by the compiler
#
sub initialize() {
@policy_chains = ();
%policy_actions = ();
%default_actions = ( DROP => 'none' ,
REJECT => 'none' ,
ACCEPT => 'none' ,
QUEUE => 'none' );
}
#
# Return a list of actions used by the policies
#
sub policy_actions() {
keys %policy_actions;
}
#
# Split the passed target into the basic target and parameter
#
sub get_target_param( $ ) {
my ( $target, $param ) = split '/', $_[0];
unless ( defined $param ) {
( $target, $param ) = ( $1, $2 ) if $target =~ /^(.*?)[(](.*)[)]$/;
}
( $target, $param );
}
#
# Convert a chain into a policy chain.
#
sub convert_to_policy_chain($$$$$)
{
my ($chainref, $source, $dest, $policy, $provisional ) = @_;
$chainref->{is_policy} = 1;
$chainref->{policy} = $policy;
$chainref->{provisional} = $provisional;
$chainref->{policychain} = $chainref->{name};
$chainref->{policypair} = [ $source, $dest ];
}
#
# Create a new policy chain and return a reference to it.
#
sub new_policy_chain($$$$)
{
my ($source, $dest, $policy, $provisional) = @_;
my $chainref = new_chain( 'filter', rules_chain( ${source}, ${dest} ) );
convert_to_policy_chain( $chainref, $source, $dest, $policy, $provisional );
$chainref;
}
#
# Set the passed chain's policychain and policy to the passed values.
#
sub set_policy_chain($$$$$)
{
my ($source, $dest, $chain1, $chainref, $policy ) = @_;
my $chainref1 = $filter_table->{$chain1};
$chainref1 = new_chain 'filter', $chain1 unless $chainref1;
unless ( $chainref1->{policychain} ) {
if ( $config{EXPAND_POLICIES} ) {
#
# We convert the canonical chain into a policy chain, using the settings of the
# passed policy chain.
#
$chainref1->{policychain} = $chain1;
$chainref1->{loglevel} = $chainref->{loglevel} if defined $chainref->{loglevel};
if ( defined $chainref->{synparams} ) {
$chainref1->{synparams} = $chainref->{synparams};
$chainref1->{synchain} = $chainref->{synchain};
}
$chainref1->{default} = $chainref->{default} if defined $chainref->{default};
$chainref1->{is_policy} = 1;
push @policy_chains, $chainref1;
} else {
$chainref1->{policychain} = $chainref->{name};
}
$chainref1->{policy} = $policy;
$chainref1->{policypair} = [ $source, $dest ];
}
}
#
# Process the policy file
#
use constant { PROVISIONAL => 1 };
sub add_or_modify_policy_chain( $$ ) {
my ( $zone, $zone1 ) = @_;
my $chain = rules_chain( ${zone}, ${zone1} );
my $chainref = $filter_table->{$chain};
if ( $chainref ) {
unless( $chainref->{is_policy} ) {
convert_to_policy_chain( $chainref, $zone, $zone1, 'CONTINUE', PROVISIONAL );
push @policy_chains, $chainref;
}
} else {
push @policy_chains, ( new_policy_chain $zone, $zone1, 'CONTINUE', PROVISIONAL );
}
}
sub print_policy($$$$) {
my ( $source, $dest, $policy , $chain ) = @_;
unless ( ( $source eq 'all' ) || ( $dest eq 'all' ) ) {
if ( $policy eq 'CONTINUE' ) {
my ( $sourceref, $destref ) = ( find_zone($source) ,find_zone( $dest ) );
warning_message "CONTINUE policy between two un-nested zones ($source, $dest)" if ! ( @{$sourceref->{parents}} || @{$destref->{parents}} );
}
progress_message_nocompress " Policy for $source to $dest is $policy using chain $chain" unless $source eq $dest;
}
}
sub use_action( $ ) {
my $action = shift;
$policy_actions{$action} = 1;
}
sub process_a_policy() {
our %validpolicies;
our @zonelist;
my ( $client, $server, $originalpolicy, $loglevel, $synparams, $connlimit ) = split_line 3, 6, 'policy file';
$loglevel = '' if $loglevel eq '-';
$synparams = '' if $synparams eq '-';
$connlimit = '' if $connlimit eq '-';
my $clientwild = ( "\L$client" eq 'all' );
fatal_error "Undefined zone ($client)" unless $clientwild || defined_zone( $client );
my $serverwild = ( "\L$server" eq 'all' );
fatal_error "Undefined zone ($server)" unless $serverwild || defined_zone( $server );
my ( $policy, $default, $remainder ) = split( /:/, $originalpolicy, 3 );
fatal_error "Invalid or missing POLICY ($originalpolicy)" unless $policy;
fatal_error "Invalid default action ($default:$remainder)" if defined $remainder;
( $policy , my $queue ) = get_target_param $policy;
if ( $default ) {
if ( "\L$default" eq 'none' ) {
$default = 'none';
} else {
my $defaulttype = $targets{$default} || 0;
if ( $defaulttype & ACTION ) {
use_action( $default );
} else {
fatal_error "Unknown Default Action ($default)";
}
}
} else {
$default = $default_actions{$policy} || '';
}
fatal_error "Invalid policy ($policy)" unless exists $validpolicies{$policy};
if ( defined $queue ) {
fatal_error "Invalid policy ($policy($queue))" unless $policy eq 'NFQUEUE';
require_capability( 'NFQUEUE_TARGET', 'An NFQUEUE Policy', 's' );
my $queuenum = numeric_value( $queue );
fatal_error "Invalid NFQUEUE queue number ($queue)" unless defined( $queuenum) && $queuenum <= 65535;
$policy = "NFQUEUE --queue-num $queuenum";
} elsif ( $policy eq 'NONE' ) {
fatal_error "NONE policy not allowed with \"all\""
if $clientwild || $serverwild;
fatal_error "NONE policy not allowed to/from firewall zone"
if ( zone_type( $client ) == FIREWALL ) || ( zone_type( $server ) == FIREWALL );
}
unless ( $clientwild || $serverwild ) {
if ( zone_type( $server ) == BPORT ) {
fatal_error "Invalid policy - DEST zone is a Bridge Port zone but the SOURCE zone is not associated with the same bridge"
unless find_zone( $client )->{bridge} eq find_zone( $server)->{bridge} || single_interface( $client ) eq find_zone( $server )->{bridge};
}
}
my $chain = rules_chain( ${client}, ${server} );
my $chainref;
if ( defined $filter_table->{$chain} ) {
$chainref = $filter_table->{$chain};
if ( $chainref->{is_policy} ) {
if ( $chainref->{provisional} ) {
$chainref->{provisional} = 0;
$chainref->{policy} = $policy;
} else {
fatal_error qq(Policy "$client $server $policy" duplicates earlier policy "@{$chainref->{policypair}} $chainref->{policy}");
}
} elsif ( $chainref->{policy} ) {
fatal_error qq(Policy "$client $server $policy" duplicates earlier policy "@{$chainref->{policypair}} $chainref->{policy}");
} else {
convert_to_policy_chain( $chainref, $client, $server, $policy, 0 );
push @policy_chains, ( $chainref ) unless $config{EXPAND_POLICIES} && ( $clientwild || $serverwild );
}
} else {
$chainref = new_policy_chain $client, $server, $policy, 0;
push @policy_chains, ( $chainref ) unless $config{EXPAND_POLICIES} && ( $clientwild || $serverwild );
}
$chainref->{loglevel} = validate_level( $loglevel ) if defined $loglevel && $loglevel ne '';
if ( $synparams ne '' || $connlimit ne '' ) {
my $value = '';
fatal_error "Invalid CONNLIMIT ($connlimit)" if $connlimit =~ /^!/;
$value = do_ratelimit $synparams, 'ACCEPT' if $synparams ne '';
$value .= do_connlimit $connlimit if $connlimit ne '';
$chainref->{synparams} = $value;
$chainref->{synchain} = $chain
}
$chainref->{default} = $default if $default;
if ( $clientwild ) {
if ( $serverwild ) {
for my $zone ( @zonelist ) {
for my $zone1 ( @zonelist ) {
set_policy_chain $client, $server, rules_chain( ${zone}, ${zone1} ), $chainref, $policy;
print_policy $zone, $zone1, $policy, $chain;
}
}
} else {
for my $zone ( all_zones ) {
set_policy_chain $client, $server, rules_chain( ${zone}, ${server} ), $chainref, $policy;
print_policy $zone, $server, $policy, $chain;
}
}
} elsif ( $serverwild ) {
for my $zone ( @zonelist ) {
set_policy_chain $client, $server, rules_chain( ${client}, ${zone} ), $chainref, $policy;
print_policy $client, $zone, $policy, $chain;
}
} else {
print_policy $client, $server, $policy, $chain;
}
}
sub save_policies() {
for my $zone1 ( all_zones ) {
for my $zone2 ( all_zones ) {
my $chainref = $filter_table->{ rules_chain( $zone1, $zone2 ) };
my $policyref = $filter_table->{ $chainref->{policychain} };
if ( $policyref->{referenced} ) {
emit_unindented "$zone1 \t=>\t$zone2\t" . $policyref->{policy} . ' using chain ' . $policyref->{name};
} elsif ( $zone1 ne $zone2 ) {
emit_unindented "$zone1 \t=>\t$zone2\t" . $policyref->{policy};
}
}
}
}
sub validate_policy()
{
our %validpolicies = (
ACCEPT => undef,
REJECT => undef,
DROP => undef,
CONTINUE => undef,
QUEUE => undef,
NFQUEUE => undef,
NONE => undef
);
our %map = ( DROP_DEFAULT => 'DROP' ,
REJECT_DEFAULT => 'REJECT' ,
ACCEPT_DEFAULT => 'ACCEPT' ,
QUEUE_DEFAULT => 'QUEUE' ,
NFQUEUE_DEFAULT => 'NFQUEUE' );
my $zone;
my $firewall = firewall_zone;
our @zonelist = $config{EXPAND_POLICIES} ? all_zones : ( all_zones, 'all' );
for my $option qw( DROP_DEFAULT REJECT_DEFAULT ACCEPT_DEFAULT QUEUE_DEFAULT NFQUEUE_DEFAULT) {
my $action = $config{$option};
next if $action eq 'none';
my $actiontype = $targets{$action};
if ( defined $actiontype ) {
fatal_error "Invalid setting ($action) for $option" unless $actiontype & ACTION;
} else {
fatal_error "Default Action $option=$action not found";
}
use_action( $action );
$default_actions{$map{$option}} = $action;
}
for $zone ( all_zones ) {
push @policy_chains, ( new_policy_chain $zone, $zone, 'ACCEPT', PROVISIONAL );
push @policy_chains, ( new_policy_chain firewall_zone, $zone, 'NONE', PROVISIONAL ) if zone_type( $zone ) == BPORT;
my $zoneref = find_zone( $zone );
if ( $config{IMPLICIT_CONTINUE} && ( @{$zoneref->{parents}} || $zoneref->{type} == VSERVER ) ) {
for my $zone1 ( all_zones ) {
unless( $zone eq $zone1 ) {
add_or_modify_policy_chain( $zone, $zone1 );
add_or_modify_policy_chain( $zone1, $zone );
}
}
}
}
if ( my $fn = open_file 'policy' ) {
first_entry "$doing $fn...";
process_a_policy while read_a_line;
} else {
fatal_error q(The 'policy' file does not exist or has zero size);
}
for $zone ( all_zones ) {
for my $zone1 ( all_zones ) {
fatal_error "No policy defined from zone $zone to zone $zone1" unless $filter_table->{rules_chain( ${zone}, ${zone1} )}{policy};
}
}
}
#
# Policy Rule application
#
sub policy_rules( $$$$$ ) {
my ( $chainref , $target, $loglevel, $default, $dropmulticast ) = @_;
unless ( $target eq 'NONE' ) {
add_rule $chainref, "-d 224.0.0.0/4 -j RETURN" if $dropmulticast && $target ne 'CONTINUE' && $target ne 'ACCEPT';
add_jump $chainref, $default, 0 if $default && $default ne 'none';
log_rule $loglevel , $chainref , $target , '' if $loglevel ne '';
fatal_error "Null target in policy_rules()" unless $target;
add_jump( $chainref , $target eq 'REJECT' ? 'reject' : $target, 1 ) unless $target eq 'CONTINUE';
}
}
sub report_syn_flood_protection() {
progress_message_nocompress ' Enabled SYN flood protection';
}
sub default_policy( $$$ ) {
my $chainref = $_[0];
my $policyref = $filter_table->{$chainref->{policychain}};
my $synparams = $policyref->{synparams};
my $default = $policyref->{default};
my $policy = $policyref->{policy};
my $loglevel = $policyref->{loglevel};
assert( $policyref );
if ( $chainref eq $policyref ) {
policy_rules $chainref , $policy, $loglevel , $default, $config{MULTICAST};
} else {
if ( $policy eq 'ACCEPT' || $policy eq 'QUEUE' || $policy =~ /^NFQUEUE/ ) {
if ( $synparams ) {
report_syn_flood_protection;
policy_rules $chainref , $policy , $loglevel , $default, $config{MULTICAST};
} else {
add_jump $chainref, $policyref, 1;
$chainref = $policyref;
}
} elsif ( $policy eq 'CONTINUE' ) {
report_syn_flood_protection if $synparams;
policy_rules $chainref , $policy , $loglevel , $default, $config{MULTICAST};
} else {
report_syn_flood_protection if $synparams;
add_jump $chainref , $policyref, 1;
$chainref = $policyref;
}
}
progress_message_nocompress " Policy $policy from $_[1] to $_[2] using chain $chainref->{name}";
}
sub apply_policy_rules() {
progress_message2 'Applying Policies...';
for my $chainref ( @policy_chains ) {
my $policy = $chainref->{policy};
unless ( $policy eq 'NONE' ) {
my $loglevel = $chainref->{loglevel};
my $provisional = $chainref->{provisional};
my $default = $chainref->{default};
my $name = $chainref->{name};
my $synparms = $chainref->{synparms};
unless ( $chainref->{referenced} || $provisional || $policy eq 'CONTINUE' ) {
if ( $config{OPTIMIZE} & 2 ) {
#
# This policy chain is empty and the only thing that we would put in it is
# the policy-related stuff. Don't create it if all we are going to put in it
# is a single jump. Generate_matrix() will just use the policy target when
# needed.
#
ensure_filter_chain $name, 1 if $default ne 'none' || $loglevel || $synparms || $config{MULTICAST} || ! ( $policy eq 'ACCEPT' || $config{FASTACCEPT} );
} else {
ensure_filter_chain $name, 1;
}
}
if ( $name =~ /^all[-2]|[-2]all$/ ) {
run_user_exit $chainref;
policy_rules $chainref , $policy, $loglevel , $default, $config{MULTICAST};
}
}
}
for my $zone ( all_zones ) {
for my $zone1 ( all_zones ) {
my $chainref = $filter_table->{rules_chain( ${zone}, ${zone1} )};
if ( $chainref->{referenced} ) {
run_user_exit $chainref;
default_policy $chainref, $zone, $zone1;
}
}
}
}
#
# Complete a standard chain
#
# - run any supplied user exit
# - search the policy file for an applicable policy and add rules as
# appropriate
# - If no applicable policy is found, add rules for an assummed
# policy of DROP INFO
#
sub complete_standard_chain ( $$$$ ) {
my ( $stdchainref, $zone, $zone2, $default ) = @_;
add_rule $stdchainref, "$globals{STATEMATCH} ESTABLISHED,RELATED -j ACCEPT" unless $config{FASTACCEPT};
run_user_exit $stdchainref;
my $ruleschainref = $filter_table->{rules_chain( ${zone}, ${zone2} ) } || $filter_table->{rules_chain( 'all', 'all' ) };
my ( $policy, $loglevel, $defaultaction ) = ( $default , 6, $config{$default . '_DEFAULT'} );
my $policychainref;
$policychainref = $filter_table->{$ruleschainref->{policychain}} if $ruleschainref;
( $policy, $loglevel, $defaultaction ) = @{$policychainref}{'policy', 'loglevel', 'default' } if $policychainref;
policy_rules $stdchainref , $policy , $loglevel, $defaultaction, 0;
}
#
# Create and populate the synflood chains corresponding to entries in /etc/shorewall/policy
#
sub setup_syn_flood_chains() {
my @zones = ( non_firewall_zones );
for my $chainref ( @policy_chains ) {
my $limit = $chainref->{synparams};
if ( $limit && ! $filter_table->{syn_flood_chain $chainref} ) {
my $level = $chainref->{loglevel};
my $synchainref = @zones > 1 ?
new_chain 'filter' , syn_flood_chain $chainref :
new_chain( 'filter' , '@' . $chainref->{name} );
add_rule $synchainref , "${limit}-j RETURN";
log_rule_limit( $level ,
$synchainref ,
$chainref->{name} ,
'DROP',
$globals{LOGLIMIT} || '-m limit --limit 5/min --limit-burst 5 ' ,
'' ,
'add' ,
'' )
if $level ne '';
add_rule $synchainref, '-j DROP';
}
}
}
#
# Optimize Policy chains with ACCEPT policy
#
sub optimize_policy_chains() {
for my $chainref ( grep $_->{policy} eq 'ACCEPT', @policy_chains ) {
optimize_chain ( $chainref );
}
#
# Often, fw->all has an ACCEPT policy. This code allows optimization in that case
#
my $outputrules = $filter_table->{OUTPUT}{rules};
if ( @{$outputrules} && $outputrules->[-1] =~ /-j ACCEPT/ ) {
optimize_chain( $filter_table->{OUTPUT} );
}
progress_message ' Policy chains optimized';
progress_message '';
}
1;

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@ -20,10 +20,11 @@
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
# This module contains process_rule() and it's associated helpers for handling
# Actions and Macros.
# This module contains
# validate_policy() and it's associated helpers.
# process_rule() and it's associated helpers for handling Actions and Macros.
#
# This module combines the former Rules and Actions modules.
# This module combines the former Policy, Rules and Actions modules.
#
package Shorewall::Rules;
require Exporter;
@ -31,13 +32,18 @@ use Shorewall::Config qw(:DEFAULT :internal);
use Shorewall::Zones;
use Shorewall::Chains qw(:DEFAULT :internal);
use Shorewall::IPAddrs;
use Shorewall::Policy;
use Scalar::Util 'reftype';
use strict;
our @ISA = qw(Exporter);
our @EXPORT = qw(
validate_policy
apply_policy_rules
complete_standard_chain
setup_syn_flood_chains
save_policies
optimize_policy_chains
process_actions1
process_actions2
process_rules
@ -46,6 +52,14 @@ our @EXPORT = qw(
our @EXPORT_OK = qw( initialize );
our $VERSION = '4.4_17';
# @policy_chains is a list of references to policy chains in the filter table
our @policy_chains;
our %policy_actions;
our %default_actions;
our %macros;
our $family;
@ -86,6 +100,12 @@ our %usedactions;
#
sub initialize( $ ) {
$family = shift;
@policy_chains = ();
%policy_actions = ();
%default_actions = ( DROP => 'none' ,
REJECT => 'none' ,
ACCEPT => 'none' ,
QUEUE => 'none' );
%macros = ();
@actionstack = ();
%active = ();
@ -100,6 +120,506 @@ sub initialize( $ ) {
}
}
#
# Split the passed target into the basic target and parameter
#
sub get_target_param( $ ) {
my ( $target, $param ) = split '/', $_[0];
unless ( defined $param ) {
( $target, $param ) = ( $1, $2 ) if $target =~ /^(.*?)[(](.*)[)]$/;
}
( $target, $param );
}
#
# Convert a chain into a policy chain.
#
sub convert_to_policy_chain($$$$$)
{
my ($chainref, $source, $dest, $policy, $provisional ) = @_;
$chainref->{is_policy} = 1;
$chainref->{policy} = $policy;
$chainref->{provisional} = $provisional;
$chainref->{policychain} = $chainref->{name};
$chainref->{policypair} = [ $source, $dest ];
}
#
# Create a new policy chain and return a reference to it.
#
sub new_policy_chain($$$$)
{
my ($source, $dest, $policy, $provisional) = @_;
my $chainref = new_chain( 'filter', rules_chain( ${source}, ${dest} ) );
convert_to_policy_chain( $chainref, $source, $dest, $policy, $provisional );
$chainref;
}
#
# Set the passed chain's policychain and policy to the passed values.
#
sub set_policy_chain($$$$$)
{
my ($source, $dest, $chain1, $chainref, $policy ) = @_;
my $chainref1 = $filter_table->{$chain1};
$chainref1 = new_chain 'filter', $chain1 unless $chainref1;
unless ( $chainref1->{policychain} ) {
if ( $config{EXPAND_POLICIES} ) {
#
# We convert the canonical chain into a policy chain, using the settings of the
# passed policy chain.
#
$chainref1->{policychain} = $chain1;
$chainref1->{loglevel} = $chainref->{loglevel} if defined $chainref->{loglevel};
if ( defined $chainref->{synparams} ) {
$chainref1->{synparams} = $chainref->{synparams};
$chainref1->{synchain} = $chainref->{synchain};
}
$chainref1->{default} = $chainref->{default} if defined $chainref->{default};
$chainref1->{is_policy} = 1;
push @policy_chains, $chainref1;
} else {
$chainref1->{policychain} = $chainref->{name};
}
$chainref1->{policy} = $policy;
$chainref1->{policypair} = [ $source, $dest ];
}
}
#
# Process the policy file
#
use constant { PROVISIONAL => 1 };
sub add_or_modify_policy_chain( $$ ) {
my ( $zone, $zone1 ) = @_;
my $chain = rules_chain( ${zone}, ${zone1} );
my $chainref = $filter_table->{$chain};
if ( $chainref ) {
unless( $chainref->{is_policy} ) {
convert_to_policy_chain( $chainref, $zone, $zone1, 'CONTINUE', PROVISIONAL );
push @policy_chains, $chainref;
}
} else {
push @policy_chains, ( new_policy_chain $zone, $zone1, 'CONTINUE', PROVISIONAL );
}
}
sub print_policy($$$$) {
my ( $source, $dest, $policy , $chain ) = @_;
unless ( ( $source eq 'all' ) || ( $dest eq 'all' ) ) {
if ( $policy eq 'CONTINUE' ) {
my ( $sourceref, $destref ) = ( find_zone($source) ,find_zone( $dest ) );
warning_message "CONTINUE policy between two un-nested zones ($source, $dest)" if ! ( @{$sourceref->{parents}} || @{$destref->{parents}} );
}
progress_message_nocompress " Policy for $source to $dest is $policy using chain $chain" unless $source eq $dest;
}
}
sub use_policy_action( $ ) {
my $action = shift;
$policy_actions{$action} = 1;
}
sub process_a_policy() {
our %validpolicies;
our @zonelist;
my ( $client, $server, $originalpolicy, $loglevel, $synparams, $connlimit ) = split_line 3, 6, 'policy file';
$loglevel = '' if $loglevel eq '-';
$synparams = '' if $synparams eq '-';
$connlimit = '' if $connlimit eq '-';
my $clientwild = ( "\L$client" eq 'all' );
fatal_error "Undefined zone ($client)" unless $clientwild || defined_zone( $client );
my $serverwild = ( "\L$server" eq 'all' );
fatal_error "Undefined zone ($server)" unless $serverwild || defined_zone( $server );
my ( $policy, $default, $remainder ) = split( /:/, $originalpolicy, 3 );
fatal_error "Invalid or missing POLICY ($originalpolicy)" unless $policy;
fatal_error "Invalid default action ($default:$remainder)" if defined $remainder;
( $policy , my $queue ) = get_target_param $policy;
if ( $default ) {
if ( "\L$default" eq 'none' ) {
$default = 'none';
} else {
my $defaulttype = $targets{$default} || 0;
if ( $defaulttype & ACTION ) {
use_policy_action( $default );
} else {
fatal_error "Unknown Default Action ($default)";
}
}
} else {
$default = $default_actions{$policy} || '';
}
fatal_error "Invalid policy ($policy)" unless exists $validpolicies{$policy};
if ( defined $queue ) {
fatal_error "Invalid policy ($policy($queue))" unless $policy eq 'NFQUEUE';
require_capability( 'NFQUEUE_TARGET', 'An NFQUEUE Policy', 's' );
my $queuenum = numeric_value( $queue );
fatal_error "Invalid NFQUEUE queue number ($queue)" unless defined( $queuenum) && $queuenum <= 65535;
$policy = "NFQUEUE --queue-num $queuenum";
} elsif ( $policy eq 'NONE' ) {
fatal_error "NONE policy not allowed with \"all\""
if $clientwild || $serverwild;
fatal_error "NONE policy not allowed to/from firewall zone"
if ( zone_type( $client ) == FIREWALL ) || ( zone_type( $server ) == FIREWALL );
}
unless ( $clientwild || $serverwild ) {
if ( zone_type( $server ) == BPORT ) {
fatal_error "Invalid policy - DEST zone is a Bridge Port zone but the SOURCE zone is not associated with the same bridge"
unless find_zone( $client )->{bridge} eq find_zone( $server)->{bridge} || single_interface( $client ) eq find_zone( $server )->{bridge};
}
}
my $chain = rules_chain( ${client}, ${server} );
my $chainref;
if ( defined $filter_table->{$chain} ) {
$chainref = $filter_table->{$chain};
if ( $chainref->{is_policy} ) {
if ( $chainref->{provisional} ) {
$chainref->{provisional} = 0;
$chainref->{policy} = $policy;
} else {
fatal_error qq(Policy "$client $server $policy" duplicates earlier policy "@{$chainref->{policypair}} $chainref->{policy}");
}
} elsif ( $chainref->{policy} ) {
fatal_error qq(Policy "$client $server $policy" duplicates earlier policy "@{$chainref->{policypair}} $chainref->{policy}");
} else {
convert_to_policy_chain( $chainref, $client, $server, $policy, 0 );
push @policy_chains, ( $chainref ) unless $config{EXPAND_POLICIES} && ( $clientwild || $serverwild );
}
} else {
$chainref = new_policy_chain $client, $server, $policy, 0;
push @policy_chains, ( $chainref ) unless $config{EXPAND_POLICIES} && ( $clientwild || $serverwild );
}
$chainref->{loglevel} = validate_level( $loglevel ) if defined $loglevel && $loglevel ne '';
if ( $synparams ne '' || $connlimit ne '' ) {
my $value = '';
fatal_error "Invalid CONNLIMIT ($connlimit)" if $connlimit =~ /^!/;
$value = do_ratelimit $synparams, 'ACCEPT' if $synparams ne '';
$value .= do_connlimit $connlimit if $connlimit ne '';
$chainref->{synparams} = $value;
$chainref->{synchain} = $chain
}
$chainref->{default} = $default if $default;
if ( $clientwild ) {
if ( $serverwild ) {
for my $zone ( @zonelist ) {
for my $zone1 ( @zonelist ) {
set_policy_chain $client, $server, rules_chain( ${zone}, ${zone1} ), $chainref, $policy;
print_policy $zone, $zone1, $policy, $chain;
}
}
} else {
for my $zone ( all_zones ) {
set_policy_chain $client, $server, rules_chain( ${zone}, ${server} ), $chainref, $policy;
print_policy $zone, $server, $policy, $chain;
}
}
} elsif ( $serverwild ) {
for my $zone ( @zonelist ) {
set_policy_chain $client, $server, rules_chain( ${client}, ${zone} ), $chainref, $policy;
print_policy $client, $zone, $policy, $chain;
}
} else {
print_policy $client, $server, $policy, $chain;
}
}
sub save_policies() {
for my $zone1 ( all_zones ) {
for my $zone2 ( all_zones ) {
my $chainref = $filter_table->{ rules_chain( $zone1, $zone2 ) };
my $policyref = $filter_table->{ $chainref->{policychain} };
if ( $policyref->{referenced} ) {
emit_unindented "$zone1 \t=>\t$zone2\t" . $policyref->{policy} . ' using chain ' . $policyref->{name};
} elsif ( $zone1 ne $zone2 ) {
emit_unindented "$zone1 \t=>\t$zone2\t" . $policyref->{policy};
}
}
}
}
sub validate_policy()
{
our %validpolicies = (
ACCEPT => undef,
REJECT => undef,
DROP => undef,
CONTINUE => undef,
QUEUE => undef,
NFQUEUE => undef,
NONE => undef
);
our %map = ( DROP_DEFAULT => 'DROP' ,
REJECT_DEFAULT => 'REJECT' ,
ACCEPT_DEFAULT => 'ACCEPT' ,
QUEUE_DEFAULT => 'QUEUE' ,
NFQUEUE_DEFAULT => 'NFQUEUE' );
my $zone;
my $firewall = firewall_zone;
our @zonelist = $config{EXPAND_POLICIES} ? all_zones : ( all_zones, 'all' );
for my $option qw( DROP_DEFAULT REJECT_DEFAULT ACCEPT_DEFAULT QUEUE_DEFAULT NFQUEUE_DEFAULT) {
my $action = $config{$option};
next if $action eq 'none';
my $actiontype = $targets{$action};
if ( defined $actiontype ) {
fatal_error "Invalid setting ($action) for $option" unless $actiontype & ACTION;
} else {
fatal_error "Default Action $option=$action not found";
}
use_policy_action( $action );
$default_actions{$map{$option}} = $action;
}
for $zone ( all_zones ) {
push @policy_chains, ( new_policy_chain $zone, $zone, 'ACCEPT', PROVISIONAL );
push @policy_chains, ( new_policy_chain firewall_zone, $zone, 'NONE', PROVISIONAL ) if zone_type( $zone ) == BPORT;
my $zoneref = find_zone( $zone );
if ( $config{IMPLICIT_CONTINUE} && ( @{$zoneref->{parents}} || $zoneref->{type} == VSERVER ) ) {
for my $zone1 ( all_zones ) {
unless( $zone eq $zone1 ) {
add_or_modify_policy_chain( $zone, $zone1 );
add_or_modify_policy_chain( $zone1, $zone );
}
}
}
}
if ( my $fn = open_file 'policy' ) {
first_entry "$doing $fn...";
process_a_policy while read_a_line;
} else {
fatal_error q(The 'policy' file does not exist or has zero size);
}
for $zone ( all_zones ) {
for my $zone1 ( all_zones ) {
fatal_error "No policy defined from zone $zone to zone $zone1" unless $filter_table->{rules_chain( ${zone}, ${zone1} )}{policy};
}
}
}
#
# Policy Rule application
#
sub policy_rules( $$$$$ ) {
my ( $chainref , $target, $loglevel, $default, $dropmulticast ) = @_;
unless ( $target eq 'NONE' ) {
add_rule $chainref, "-d 224.0.0.0/4 -j RETURN" if $dropmulticast && $target ne 'CONTINUE' && $target ne 'ACCEPT';
add_jump $chainref, $default, 0 if $default && $default ne 'none';
log_rule $loglevel , $chainref , $target , '' if $loglevel ne '';
fatal_error "Null target in policy_rules()" unless $target;
add_jump( $chainref , $target eq 'REJECT' ? 'reject' : $target, 1 ) unless $target eq 'CONTINUE';
}
}
sub report_syn_flood_protection() {
progress_message_nocompress ' Enabled SYN flood protection';
}
sub default_policy( $$$ ) {
my $chainref = $_[0];
my $policyref = $filter_table->{$chainref->{policychain}};
my $synparams = $policyref->{synparams};
my $default = $policyref->{default};
my $policy = $policyref->{policy};
my $loglevel = $policyref->{loglevel};
assert( $policyref );
if ( $chainref eq $policyref ) {
policy_rules $chainref , $policy, $loglevel , $default, $config{MULTICAST};
} else {
if ( $policy eq 'ACCEPT' || $policy eq 'QUEUE' || $policy =~ /^NFQUEUE/ ) {
if ( $synparams ) {
report_syn_flood_protection;
policy_rules $chainref , $policy , $loglevel , $default, $config{MULTICAST};
} else {
add_jump $chainref, $policyref, 1;
$chainref = $policyref;
}
} elsif ( $policy eq 'CONTINUE' ) {
report_syn_flood_protection if $synparams;
policy_rules $chainref , $policy , $loglevel , $default, $config{MULTICAST};
} else {
report_syn_flood_protection if $synparams;
add_jump $chainref , $policyref, 1;
$chainref = $policyref;
}
}
progress_message_nocompress " Policy $policy from $_[1] to $_[2] using chain $chainref->{name}";
}
sub apply_policy_rules() {
progress_message2 'Applying Policies...';
for my $chainref ( @policy_chains ) {
my $policy = $chainref->{policy};
unless ( $policy eq 'NONE' ) {
my $loglevel = $chainref->{loglevel};
my $provisional = $chainref->{provisional};
my $default = $chainref->{default};
my $name = $chainref->{name};
my $synparms = $chainref->{synparms};
unless ( $chainref->{referenced} || $provisional || $policy eq 'CONTINUE' ) {
if ( $config{OPTIMIZE} & 2 ) {
#
# This policy chain is empty and the only thing that we would put in it is
# the policy-related stuff. Don't create it if all we are going to put in it
# is a single jump. Generate_matrix() will just use the policy target when
# needed.
#
ensure_filter_chain $name, 1 if $default ne 'none' || $loglevel || $synparms || $config{MULTICAST} || ! ( $policy eq 'ACCEPT' || $config{FASTACCEPT} );
} else {
ensure_filter_chain $name, 1;
}
}
if ( $name =~ /^all[-2]|[-2]all$/ ) {
run_user_exit $chainref;
policy_rules $chainref , $policy, $loglevel , $default, $config{MULTICAST};
}
}
}
for my $zone ( all_zones ) {
for my $zone1 ( all_zones ) {
my $chainref = $filter_table->{rules_chain( ${zone}, ${zone1} )};
if ( $chainref->{referenced} ) {
run_user_exit $chainref;
default_policy $chainref, $zone, $zone1;
}
}
}
}
#
# Complete a standard chain
#
# - run any supplied user exit
# - search the policy file for an applicable policy and add rules as
# appropriate
# - If no applicable policy is found, add rules for an assummed
# policy of DROP INFO
#
sub complete_standard_chain ( $$$$ ) {
my ( $stdchainref, $zone, $zone2, $default ) = @_;
add_rule $stdchainref, "$globals{STATEMATCH} ESTABLISHED,RELATED -j ACCEPT" unless $config{FASTACCEPT};
run_user_exit $stdchainref;
my $ruleschainref = $filter_table->{rules_chain( ${zone}, ${zone2} ) } || $filter_table->{rules_chain( 'all', 'all' ) };
my ( $policy, $loglevel, $defaultaction ) = ( $default , 6, $config{$default . '_DEFAULT'} );
my $policychainref;
$policychainref = $filter_table->{$ruleschainref->{policychain}} if $ruleschainref;
( $policy, $loglevel, $defaultaction ) = @{$policychainref}{'policy', 'loglevel', 'default' } if $policychainref;
policy_rules $stdchainref , $policy , $loglevel, $defaultaction, 0;
}
#
# Create and populate the synflood chains corresponding to entries in /etc/shorewall/policy
#
sub setup_syn_flood_chains() {
my @zones = ( non_firewall_zones );
for my $chainref ( @policy_chains ) {
my $limit = $chainref->{synparams};
if ( $limit && ! $filter_table->{syn_flood_chain $chainref} ) {
my $level = $chainref->{loglevel};
my $synchainref = @zones > 1 ?
new_chain 'filter' , syn_flood_chain $chainref :
new_chain( 'filter' , '@' . $chainref->{name} );
add_rule $synchainref , "${limit}-j RETURN";
log_rule_limit( $level ,
$synchainref ,
$chainref->{name} ,
'DROP',
$globals{LOGLIMIT} || '-m limit --limit 5/min --limit-burst 5 ' ,
'' ,
'add' ,
'' )
if $level ne '';
add_rule $synchainref, '-j DROP';
}
}
}
#
# Optimize Policy chains with ACCEPT policy
#
sub optimize_policy_chains() {
for my $chainref ( grep $_->{policy} eq 'ACCEPT', @policy_chains ) {
optimize_chain ( $chainref );
}
#
# Often, fw->all has an ACCEPT policy. This code allows optimization in that case
#
my $outputrules = $filter_table->{OUTPUT}{rules};
if ( @{$outputrules} && $outputrules->[-1] =~ /-j ACCEPT/ ) {
optimize_chain( $filter_table->{OUTPUT} );
}
progress_message ' Policy chains optimized';
progress_message '';
}
#
# Return ( action, level[:tag] ) from passed full action
#
@ -128,19 +648,6 @@ sub split_action ( $ ) {
( $target, join ":", @a );
}
#
# Split the passed target into the basic target and parameter
#
sub get_target_param( $ ) {
my ( $target, $param ) = split '/', $_[0];
unless ( defined $param ) {
( $target, $param ) = ( $1, $2 ) if $target =~ /^(.*?)[(](.*)[)]$/;
}
( $target, $param );
}
#
# Create a normalized action name from the passed pieces.
#
@ -763,7 +1270,7 @@ sub process_action( $) {
sub process_actions2 () {
progress_message2 "$doing policy actions...";
for ( map normalize_action_name $_, ( grep ! ( $targets{$_} & BUILTIN ), policy_actions ) ) {
for ( map normalize_action_name $_, ( grep ! ( $targets{$_} & BUILTIN ), keys %policy_actions ) ) {
if ( my $ref = use_action( $_ ) ) {
process_action( $ref );
}