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2509 lines
72 KiB
Perl
2509 lines
72 KiB
Perl
#
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# Shorewall 4.4 -- /usr/share/shorewall/Shorewall/Rules.pm
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#
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# This program is under GPL [http://www.gnu.org/licenses/old-licenses/gpl-2.0.txt]
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#
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# (c) 2007,2008,2009,2010,2011 - 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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#
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# This module handles policies and rules. It contains:
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#
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# process_() and it's associated helpers.
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# process_rules() and it's associated helpers for handling Actions and Macros.
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#
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# This module combines the former Policy, Rules and Actions modules.
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#
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package Shorewall::Rules;
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require Exporter;
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use Shorewall::Config qw(:DEFAULT :internal);
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use Shorewall::Zones;
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use Shorewall::Chains qw(:DEFAULT :internal);
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use Shorewall::IPAddrs;
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use Scalar::Util 'reftype';
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use strict;
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our @ISA = qw(Exporter);
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our @EXPORT = qw(
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process_policies
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apply_policy_rules
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complete_standard_chain
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setup_syn_flood_chains
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save_policies
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ensure_rules_chain
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optimize_policy_chains
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process_actions
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process_rules
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verify_audit
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);
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our @EXPORT_OK = qw( initialize );
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our $VERSION = 'MODULEVERSION';
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#
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# Globals are documented in the initialize() function
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#
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my %sections;
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my $section;
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my @policy_chains;
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my %default_actions;
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my %macros;
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our $family;
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my @builtins;
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#
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# Commands that can be embedded in a basic rule and how many total tokens on the line (0 => unlimited).
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#
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my $rule_commands = { COMMENT => 0, FORMAT => 2, SECTION => 2 };
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my $action_commands = { COMMENT => 0, FORMAT => 2, SECTION => 2, DEFAULTS => 2 };
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my $macro_commands = { COMMENT => 0, FORMAT => 2, SECTION => 2, DEFAULT => 2 };
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my %rulecolumns = ( action => 0,
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source => 1,
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dest => 2,
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proto => 3,
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dport => 4,
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sport => 5,
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origdest => 6,
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rate => 7,
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user => 8,
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mark => 9,
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connlimit => 10,
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time => 11,
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headers => 12,
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switch => 13 );
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use constant { MAX_MACRO_NEST_LEVEL => 5 };
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my $macro_nest_level;
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my @actionstack;
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my %active;
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# Action Table
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#
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# %actions{ actchain => used to eliminate collisions }
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#
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my %actions;
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#
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# Contains an entry for each used <action>:<level>[:<tag>] that maps to the associated chain.
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#
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my %usedactions;
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#
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# Policies for which AUDIT is allowed
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#
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my %auditpolicies = ( ACCEPT => 1,
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DROP => 1,
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REJECT => 1
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);
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#
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# Rather than initializing globals in an INIT block or during declaration,
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# we initialize them in a function. This is done for two reasons:
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#
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# 1. Proper initialization depends on the address family which isn't
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# known until the compiler has started.
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#
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# 2. The compiler can run multiple times in the same process so it has to be
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# able to re-initialize its dependent modules' state.
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#
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sub initialize( $ ) {
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$family = shift;
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#
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# Chains created as a result of entries in the policy file
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@policy_chains = ();
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#
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# This is updated from the *_DEFAULT settings in shorewall.conf. Those settings were stored
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# in the %config hash when shorewall[6].conf was processed.
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#
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%default_actions = ( DROP => 'none' ,
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REJECT => 'none' ,
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ACCEPT => 'none' ,
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QUEUE => 'none' ,
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NFQUEUE => 'none' ,
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);
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#
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# These are set to 1 as sections are encountered.
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#
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%sections = ( BLACKLIST => 0,
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ALL => 0,
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ESTABLISHED => 0,
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RELATED => 0,
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NEW => 0
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);
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#
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# Current rules file section.
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#
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$section = '';
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#
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# Macro=><macro file> mapping
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#
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%macros = ();
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#
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# Stack of nested action calls while parsing action.* files.
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#
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@actionstack = ();
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#
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# This hash provides keyed access to @actionstack
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#
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%active = ();
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#
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# Self-explainatory
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#
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$macro_nest_level = 0;
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#
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# All builtin actions plus those mentioned in /etc/shorewall[6]/actions and /usr/share/shorewall[6]/actions
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#
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%actions = ();
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#
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# Action variants actually used. Key is <action>:<loglevel>:<tag>:<params>; value is corresponding chain name
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#
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%usedactions = ();
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if ( $family == F_IPV4 ) {
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@builtins = qw/dropBcast allowBcast dropNotSyn rejNotSyn dropInvalid allowInvalid allowinUPnP forwardUPnP Limit/;
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} else {
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@builtins = qw/dropBcast allowBcast dropNotSyn rejNotSyn dropInvalid allowInvalid/;
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}
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}
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###############################################################################
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# Functions moved from the former Policy Module
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###############################################################################
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#
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# Split the passed target into the basic target and parameter (previously duplicated in this file)
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#
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sub get_target_param( $ ) {
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my ( $target, $param ) = split '/', $_[0];
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unless ( defined $param ) {
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( $target, $param ) = ( $1, $2 ) if $target =~ /^(.*?)[(](.*)[)]$/;
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}
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( $target, $param );
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}
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#
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# Convert a chain into a policy chain.
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#
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sub convert_to_policy_chain($$$$$$)
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{
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my ($chainref, $source, $dest, $policy, $provisional, $audit ) = @_;
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$chainref->{is_policy} = 1;
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$chainref->{policy} = $policy;
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$chainref->{provisional} = $provisional;
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$chainref->{audit} = $audit;
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$chainref->{policychain} = $chainref->{name};
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$chainref->{policypair} = [ $source, $dest ];
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}
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#
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# Create a new policy chain and return a reference to it.
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#
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sub new_policy_chain($$$$$)
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{
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my ($source, $dest, $policy, $provisional, $audit) = @_;
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my $chainref = new_chain( 'filter', rules_chain( ${source}, ${dest} ) );
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convert_to_policy_chain( $chainref, $source, $dest, $policy, $provisional, $audit );
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$chainref;
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}
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#
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# Set the passed chain's policychain and policy to the passed values.
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#
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sub set_policy_chain($$$$$)
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{
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my ($source, $dest, $chain1, $chainref, $policy ) = @_;
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my $chainref1 = $filter_table->{$chain1};
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$chainref1 = new_chain 'filter', $chain1 unless $chainref1;
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unless ( $chainref1->{policychain} ) {
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if ( $config{EXPAND_POLICIES} ) {
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#
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# We convert the canonical chain into a policy chain, using the settings of the
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# passed policy chain.
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#
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$chainref1->{policychain} = $chain1;
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$chainref1->{loglevel} = $chainref->{loglevel} if defined $chainref->{loglevel};
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$chainref1->{audit} = $chainref->{audit} if defined $chainref->{audit};
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if ( defined $chainref->{synparams} ) {
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$chainref1->{synparams} = $chainref->{synparams};
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$chainref1->{synchain} = $chainref->{synchain};
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}
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$chainref1->{default} = $chainref->{default} if defined $chainref->{default};
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$chainref1->{is_policy} = 1;
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push @policy_chains, $chainref1;
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} else {
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$chainref1->{policychain} = $chainref->{name};
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}
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$chainref1->{policy} = $policy;
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$chainref1->{policypair} = [ $source, $dest ];
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}
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}
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#
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# Process the policy file
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#
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use constant { PROVISIONAL => 1 };
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sub add_or_modify_policy_chain( $$$ ) {
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my ( $zone, $zone1, $audit ) = @_;
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my $chain = rules_chain( ${zone}, ${zone1} );
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my $chainref = $filter_table->{$chain};
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if ( $chainref ) {
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unless( $chainref->{is_policy} ) {
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convert_to_policy_chain( $chainref, $zone, $zone1, 'CONTINUE', PROVISIONAL, $audit );
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push @policy_chains, $chainref;
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}
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} else {
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push @policy_chains, ( new_policy_chain $zone, $zone1, 'CONTINUE', PROVISIONAL, $audit );
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}
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}
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sub print_policy($$$$) {
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my ( $source, $dest, $policy , $chain ) = @_;
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unless ( ( $source eq 'all' ) || ( $dest eq 'all' ) ) {
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if ( $policy eq 'CONTINUE' ) {
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my ( $sourceref, $destref ) = ( find_zone($source) ,find_zone( $dest ) );
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warning_message "CONTINUE policy between two un-nested zones ($source, $dest)" if ! ( @{$sourceref->{parents}} || @{$destref->{parents}} );
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}
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progress_message_nocompress " Policy for $source to $dest is $policy using chain $chain" unless $source eq $dest;
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}
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}
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sub use_policy_action( $ );
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sub normalize_action( $$$ );
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sub normalize_action_name( $ );
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#
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# Process an entry in the policy file.
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#
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sub process_a_policy() {
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our %validpolicies;
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our @zonelist;
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my ( $client, $server, $originalpolicy, $loglevel, $synparams, $connlimit ) =
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split_line 'policy file', { source => 0, dest => 1, policy => 2, loglevel => 3, limit => 4, connlimit => 5 } ;
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$loglevel = '' if $loglevel eq '-';
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$synparams = '' if $synparams eq '-';
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$connlimit = '' if $connlimit eq '-';
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fatal_error 'SOURCE must be specified' if $client eq '-';
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fatal_error 'DEST must be specified' if $server eq '-';
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fatal_error 'POLICY must be specified' if $originalpolicy eq '-';
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my $clientwild = ( "\L$client" eq 'all' );
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fatal_error "Undefined zone ($client)" unless $clientwild || defined_zone( $client );
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my $serverwild = ( "\L$server" eq 'all' );
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fatal_error "Undefined zone ($server)" unless $serverwild || defined_zone( $server );
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my $audit = ( $originalpolicy =~ s/:audit$// );
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require_capability 'AUDIT_TARGET', ":audit", "s" if $audit;
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my ( $policy, $default, $remainder ) = split( /:/, $originalpolicy, 3 );
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fatal_error "Invalid or missing POLICY ($originalpolicy)" unless $policy;
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fatal_error "Invalid default action ($default:$remainder)" if defined $remainder;
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( $policy , my $queue ) = get_target_param $policy;
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fatal_error "Invalid policy ($policy)" unless exists $validpolicies{$policy};
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if ( $audit ) {
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fatal_error "A $policy policy may not be audited" unless $auditpolicies{$policy};
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}
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if ( $default ) {
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my ( $def, $param ) = get_target_param( $default );
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if ( "\L$default" eq 'none' ) {
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$default = 'none';
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} elsif ( $actions{$def} ) {
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$default = supplied $param ? normalize_action( $def, 'none', $param ) : normalize_action_name $def;
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use_policy_action( $default );
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} else {
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fatal_error "Unknown Default Action ($default)";
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}
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} else {
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$default = $default_actions{$policy} || 'none';
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}
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if ( defined $queue ) {
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fatal_error "Invalid policy ($policy($queue))" unless $policy eq 'NFQUEUE';
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require_capability( 'NFQUEUE_TARGET', 'An NFQUEUE Policy', 's' );
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my $queuenum = numeric_value( $queue );
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fatal_error "Invalid NFQUEUE queue number ($queue)" unless defined( $queuenum) && $queuenum <= 65535;
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$policy = "NFQUEUE --queue-num $queuenum";
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} elsif ( $policy eq 'NONE' ) {
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fatal_error "NONE policy not allowed with \"all\""
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if $clientwild || $serverwild;
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fatal_error "NONE policy not allowed to/from firewall zone"
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if ( zone_type( $client ) == FIREWALL ) || ( zone_type( $server ) == FIREWALL );
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}
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unless ( $clientwild || $serverwild ) {
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if ( zone_type( $server ) & BPORT ) {
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fatal_error "Invalid policy - DEST zone is a Bridge Port zone but the SOURCE zone is not associated with the same bridge"
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unless find_zone( $client )->{bridge} eq find_zone( $server)->{bridge} || single_interface( $client ) eq find_zone( $server )->{bridge};
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}
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}
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my $chain = rules_chain( ${client}, ${server} );
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my $chainref;
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if ( defined $filter_table->{$chain} ) {
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$chainref = $filter_table->{$chain};
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if ( $chainref->{is_policy} ) {
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if ( $chainref->{provisional} ) {
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$chainref->{provisional} = 0;
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$chainref->{policy} = $policy;
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} else {
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fatal_error qq(Policy "$client $server $policy" duplicates earlier policy "@{$chainref->{policypair}} $chainref->{policy}");
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}
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} elsif ( $chainref->{policy} ) {
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fatal_error qq(Policy "$client $server $policy" duplicates earlier policy "@{$chainref->{policypair}} $chainref->{policy}");
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} else {
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convert_to_policy_chain( $chainref, $client, $server, $policy, 0 , $audit );
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push @policy_chains, ( $chainref ) unless $config{EXPAND_POLICIES} && ( $clientwild || $serverwild );
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}
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} else {
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$chainref = new_policy_chain $client, $server, $policy, 0, $audit;
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push @policy_chains, ( $chainref ) unless $config{EXPAND_POLICIES} && ( $clientwild || $serverwild );
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}
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$chainref->{loglevel} = validate_level( $loglevel ) if supplied $loglevel;
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if ( $synparams ne '' || $connlimit ne '' ) {
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my $value = '';
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fatal_error "Invalid CONNLIMIT ($connlimit)" if $connlimit =~ /^!/;
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$value = do_ratelimit $synparams, 'ACCEPT' if $synparams ne '';
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$value .= do_connlimit $connlimit if $connlimit ne '';
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$chainref->{synparams} = $value;
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$chainref->{synchain} = $chain
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}
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assert( $default );
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my $chainref1 = $usedactions{$default};
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$chainref->{default} = $chainref1 ? $chainref1->{name} : $default;
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if ( $clientwild ) {
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if ( $serverwild ) {
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for my $zone ( @zonelist ) {
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for my $zone1 ( @zonelist ) {
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set_policy_chain $client, $server, rules_chain( ${zone}, ${zone1} ), $chainref, $policy;
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print_policy $zone, $zone1, $policy, $chain;
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}
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}
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} else {
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for my $zone ( all_zones ) {
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set_policy_chain $client, $server, rules_chain( ${zone}, ${server} ), $chainref, $policy;
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print_policy $zone, $server, $policy, $chain;
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}
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}
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} elsif ( $serverwild ) {
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for my $zone ( @zonelist ) {
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set_policy_chain $client, $server, rules_chain( ${client}, ${zone} ), $chainref, $policy;
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print_policy $client, $zone, $policy, $chain;
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}
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} else {
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print_policy $client, $server, $policy, $chain;
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}
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}
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#
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# Generate contents of the /var/lib/shorewall[6]/.policies file as 'here documents' in the generated script
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#
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sub save_policies() {
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for my $zone1 ( all_zones ) {
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for my $zone2 ( all_zones ) {
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my $chainref = $filter_table->{ rules_chain( $zone1, $zone2 ) };
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my $policyref = $filter_table->{ $chainref->{policychain} };
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if ( $policyref->{referenced} ) {
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emit_unindented "$zone1 \t=>\t$zone2\t" . $policyref->{policy} . ' using chain ' . $policyref->{name};
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} elsif ( $zone1 ne $zone2 ) {
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emit_unindented "$zone1 \t=>\t$zone2\t" . $policyref->{policy};
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}
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}
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}
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}
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#
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# Process the policy file
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#
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sub process_policies()
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{
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our %validpolicies = (
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ACCEPT => undef,
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REJECT => undef,
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DROP => undef,
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CONTINUE => undef,
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QUEUE => undef,
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NFQUEUE => undef,
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NONE => undef
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);
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our %map = ( DROP_DEFAULT => 'DROP' ,
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REJECT_DEFAULT => 'REJECT' ,
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ACCEPT_DEFAULT => 'ACCEPT' ,
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QUEUE_DEFAULT => 'QUEUE' ,
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NFQUEUE_DEFAULT => 'NFQUEUE' );
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my $zone;
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my $firewall = firewall_zone;
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our @zonelist = $config{EXPAND_POLICIES} ? all_zones : ( all_zones, 'all' );
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for my $option ( qw( DROP_DEFAULT REJECT_DEFAULT ACCEPT_DEFAULT QUEUE_DEFAULT NFQUEUE_DEFAULT) ) {
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my $action = $config{$option};
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unless ( $action eq 'none' ) {
|
|
my ( $act, $param ) = get_target_param( $action );
|
|
|
|
if ( "\L$action" eq 'none' ) {
|
|
$action = 'none';
|
|
} elsif ( $actions{$act} ) {
|
|
$action = supplied $param ? normalize_action( $act, 'none', $param ) : normalize_action_name $act;
|
|
use_policy_action( $action );
|
|
} elsif ( $targets{$act} ) {
|
|
fatal_error "Invalid setting ($action) for $option";
|
|
} else {
|
|
fatal_error "Default Action $option=$action not found";
|
|
}
|
|
}
|
|
|
|
$default_actions{$map{$option}} = $action;
|
|
}
|
|
|
|
for $zone ( all_zones ) {
|
|
push @policy_chains, ( new_policy_chain $zone, $zone, 'ACCEPT', PROVISIONAL, 0 );
|
|
push @policy_chains, ( new_policy_chain firewall_zone, $zone, 'NONE', PROVISIONAL, 0 ) 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, 0 );
|
|
add_or_modify_policy_chain( $zone1, $zone , 0 );
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
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( $$$$$ ) {
|
|
my ( $chainref , $target, $loglevel, $default, $dropmulticast ) = @_;
|
|
|
|
unless ( $target eq 'NONE' ) {
|
|
add_ijump $chainref, j => 'RETURN', d => '224.0.0.0/4' if $dropmulticast && $target ne 'CONTINUE' && $target ne 'ACCEPT';
|
|
add_ijump $chainref, j => $default if $default && $default ne 'none';
|
|
log_rule $loglevel , $chainref , $target , '' if $loglevel ne '';
|
|
fatal_error "Null target in policy_rules()" unless $target;
|
|
|
|
add_ijump( $chainref , j => 'AUDIT', targetopts => '--type ' . lc $target ) if $chainref->{audit};
|
|
add_ijump( $chainref , g => $target eq 'REJECT' ? 'reject' : $target ) unless $target eq 'CONTINUE';
|
|
}
|
|
}
|
|
|
|
sub report_syn_flood_protection() {
|
|
progress_message_nocompress ' Enabled SYN flood protection';
|
|
}
|
|
|
|
#
|
|
# Complete a policy chain - Add policy-enforcing rules and syn flood, if specified
|
|
#
|
|
sub default_policy( $$$ ) {
|
|
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_ijump $chainref, g => $policyref;
|
|
$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_ijump $chainref , g => $policyref;
|
|
$chainref = $policyref;
|
|
}
|
|
}
|
|
|
|
progress_message_nocompress " Policy $policy from $_[1] to $_[2] using chain $chainref->{name}";
|
|
|
|
}
|
|
|
|
sub ensure_rules_chain( $ );
|
|
|
|
#
|
|
# Finish all policy Chains
|
|
#
|
|
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_rules_chain $name if $default ne 'none' || $loglevel || $synparms || $config{MULTICAST} || ! ( $policy eq 'ACCEPT' || $config{FASTACCEPT} );
|
|
} else {
|
|
ensure_rules_chain $name;
|
|
}
|
|
}
|
|
|
|
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 ( $$$$ ) {
|
|
my ( $stdchainref, $zone, $zone2, $default ) = @_;
|
|
|
|
run_user_exit $stdchainref;
|
|
|
|
my $ruleschainref = $filter_table->{rules_chain( ${zone}, ${zone2} ) } || $filter_table->{rules_chain( 'all', 'all' ) };
|
|
my ( $policy, $loglevel, $defaultaction ) = ( $default , 6, $config{$default . '_DEFAULT'} );
|
|
my $policychainref;
|
|
|
|
$policychainref = $filter_table->{$ruleschainref->{policychain}} if $ruleschainref;
|
|
|
|
( $policy, $loglevel, $defaultaction ) = @{$policychainref}{'policy', 'loglevel', 'default' } if $policychainref;
|
|
|
|
policy_rules $stdchainref , $policy , $loglevel, $defaultaction, 0;
|
|
}
|
|
|
|
sub require_audit($$;$);
|
|
|
|
#
|
|
# 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_ijump $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]->{target} eq 'ACCEPT' ) {
|
|
optimize_chain( $filter_table->{OUTPUT} );
|
|
}
|
|
|
|
progress_message ' Policy chains optimized';
|
|
progress_message '';
|
|
}
|
|
|
|
################################################################################
|
|
# Modules moved from the Chains module in 4.4.18
|
|
################################################################################
|
|
|
|
sub finish_chain_section( $$ );
|
|
|
|
#
|
|
# Create a rules chain if necessary and populate it with the appropriate ESTABLISHED,RELATED rule(s) and perform SYN rate limiting.
|
|
#
|
|
# Return a reference to the chain's table entry.
|
|
#
|
|
sub ensure_rules_chain( $ )
|
|
{
|
|
my ($chain) = @_;
|
|
|
|
my $chainref = $filter_table->{$chain};
|
|
|
|
$chainref = dont_move( new_chain( 'filter', $chain ) ) unless $chainref;
|
|
|
|
unless ( $chainref->{referenced} ) {
|
|
if ( $section =~/^(NEW|DONE)$/ ) {
|
|
finish_chain_section $chainref , 'ESTABLISHED,RELATED';
|
|
} elsif ( $section eq 'RELATED' ) {
|
|
finish_chain_section $chainref , 'ESTABLISHED';
|
|
}
|
|
|
|
$chainref->{referenced} = 1;
|
|
}
|
|
|
|
$chainref;
|
|
}
|
|
|
|
#
|
|
# Add ESTABLISHED,RELATED rules and synparam jumps to the passed chain
|
|
#
|
|
sub finish_chain_section ($$) {
|
|
my ($chainref, $state ) = @_;
|
|
my $chain = $chainref->{name};
|
|
my $related_level = $config{RELATED_LOG_LEVEL};
|
|
my $related_target = $globals{RELATED_TARGET};
|
|
|
|
push_comment(''); #These rules should not have comments
|
|
|
|
if ( $state =~ /RELATED/ && ( $related_level || $related_target ne 'ACCEPT' ) ) {
|
|
|
|
if ( $related_level ) {
|
|
my $relatedref = new_chain( 'filter', "+$chainref->{name}" );
|
|
log_rule( $related_level,
|
|
$relatedref,
|
|
$config{RELATED_DISPOSITION},
|
|
'' );
|
|
add_ijump( $relatedref, g => $related_target );
|
|
|
|
$related_target = $relatedref->{name};
|
|
}
|
|
|
|
add_ijump $chainref, g => $related_target, state_imatch 'RELATED';
|
|
|
|
$state =~ s/,?RELATED//;
|
|
}
|
|
|
|
if ( $state ) {
|
|
add_ijump $chainref, j => 'ACCEPT', state_imatch $state unless $config{FASTACCEPT};
|
|
}
|
|
|
|
if ($sections{NEW} ) {
|
|
if ( $chainref->{is_policy} ) {
|
|
if ( $chainref->{synparams} ) {
|
|
my $synchainref = ensure_chain 'filter', syn_flood_chain $chainref;
|
|
if ( $section eq 'DONE' ) {
|
|
if ( $chainref->{policy} =~ /^(ACCEPT|CONTINUE|QUEUE|NFQUEUE)/ ) {
|
|
add_ijump $chainref, j => $synchainref, p => 'tcp --syn';
|
|
}
|
|
} else {
|
|
add_ijump $chainref, j => $synchainref, p => 'tcp --syn';
|
|
}
|
|
}
|
|
} else {
|
|
my $policychainref = $filter_table->{$chainref->{policychain}};
|
|
if ( $policychainref->{synparams} ) {
|
|
my $synchainref = ensure_chain 'filter', syn_flood_chain $policychainref;
|
|
add_ijump $chainref, j => $synchainref, p => 'tcp --syn';
|
|
}
|
|
}
|
|
|
|
$chainref->{new} = @{$chainref->{rules}};
|
|
}
|
|
|
|
pop_comment;
|
|
}
|
|
|
|
#
|
|
# Do section-end processing
|
|
#
|
|
sub finish_section ( $ ) {
|
|
my $sections = $_[0];
|
|
|
|
$sections{$_} = 1 for split /,/, $sections;
|
|
|
|
for my $zone ( all_zones ) {
|
|
for my $zone1 ( all_zones ) {
|
|
my $chainref = $chain_table{'filter'}{rules_chain( $zone, $zone1 )};
|
|
finish_chain_section $chainref, $sections if $chainref->{referenced};
|
|
}
|
|
}
|
|
}
|
|
################################################################################
|
|
# Functions moved from the Actions module in 4.4.16
|
|
################################################################################
|
|
#
|
|
# Return ( action, level[:tag] ) from passed full action
|
|
#
|
|
sub split_action ( $ ) {
|
|
my $action = $_[0];
|
|
|
|
my $target = '';
|
|
my $max = 3;
|
|
#
|
|
# The following rather grim RE, when matched, breaks the action into two parts:
|
|
#
|
|
# basicaction(param)
|
|
# logging part (may be empty)
|
|
#
|
|
# The param may contain one or more ':' characters
|
|
#
|
|
if ( $action =~ /^([^(:]+\(.*?\))(:(.*))?$/ ) {
|
|
$target = $1;
|
|
$action = $2 ? $3 : '';
|
|
$max = 2;
|
|
}
|
|
|
|
my @a = split( /:/ , $action, 4 );
|
|
fatal_error "Invalid ACTION ($action)" if ( $action =~ /::/ ) || ( @a > $max );
|
|
$target = shift @a unless $target;
|
|
( $target, join ":", @a );
|
|
}
|
|
|
|
#
|
|
# Create a normalized action name from the passed pieces.
|
|
#
|
|
# Internally, action invocations are uniquely identified by a 4-tuple that
|
|
# includes the action name, log level, log tag and params. The pieces of the tuple
|
|
# are separated by ":".
|
|
#
|
|
sub normalize_action( $$$ ) {
|
|
my $action = shift;
|
|
my $level = shift;
|
|
my $param = shift;
|
|
|
|
( $level, my $tag ) = split ':', $level;
|
|
|
|
$level = 'none' unless supplied $level;
|
|
$tag = '' unless defined $tag;
|
|
$param = '' unless defined $param;
|
|
$param = '' if $param eq '-';
|
|
|
|
join( ':', $action, $level, $tag, $param );
|
|
}
|
|
|
|
#
|
|
# Accepts a rule target and returns a normalized tuple
|
|
#
|
|
|
|
sub normalize_action_name( $ ) {
|
|
my $target = shift;
|
|
my ( $action, $loglevel) = split_action $target;
|
|
|
|
normalize_action( $action, $loglevel, '' );
|
|
}
|
|
|
|
#
|
|
# Produce a recognizable target from a normalized action
|
|
#
|
|
sub externalize( $ ) {
|
|
my ( $target, $level, $tag, $params ) = split /:/, shift, 4;
|
|
|
|
$target = join( '', $target, '(', $params , ')' ) if $params;
|
|
$target .= ":$level" if $level && $level ne 'none';
|
|
$target .= ":$tag" if $tag;
|
|
$target;
|
|
}
|
|
|
|
#
|
|
# Define an Action
|
|
#
|
|
sub new_action( $$ ) {
|
|
|
|
my ( $action , $type ) = @_;
|
|
|
|
fatal_error "Invalid action name($action)" if reserved_name( $action );
|
|
|
|
$actions{$action} = { actchain => '' };
|
|
|
|
$targets{$action} = $type;
|
|
}
|
|
|
|
#
|
|
# Create and record a log action chain -- Log action chains have names
|
|
# that are formed from the action name by prepending a "%" and appending
|
|
# a 1- or 2-digit sequence number. In the functions that follow,
|
|
# the $chain, $level and $tag variable serves as arguments to the user's
|
|
# exit. We call the exit corresponding to the name of the action but we
|
|
# set $chain to the name of the iptables chain where rules are to be added.
|
|
# Similarly, $level and $tag contain the log level and log tag respectively.
|
|
#
|
|
# The maximum length of a chain name is 30 characters -- since the log
|
|
# action chain name is 2-3 characters longer than the base chain name,
|
|
# this function truncates the original chain name where necessary before
|
|
# it adds the leading "%" and trailing sequence number.
|
|
#
|
|
sub createlogactionchain( $$$$$ ) {
|
|
my ( $normalized, $action, $level, $tag, $param ) = @_;
|
|
my $chain = $action;
|
|
my $actionref = $actions{$action};
|
|
my $chainref;
|
|
|
|
validate_level $level;
|
|
|
|
$actionref = new_action( $action , ACTION ) unless $actionref;
|
|
|
|
$chain = substr $chain, 0, 28 if ( length $chain ) > 28;
|
|
|
|
if ( $filter_table->{$chain} ) {
|
|
CHECKDUP:
|
|
{
|
|
$actionref->{actchain}++ while $chain_table{filter}{'%' . $chain . $actionref->{actchain}};
|
|
$chain = substr( $chain, 0, 27 ), redo CHECKDUP if ( $actionref->{actchain} || 0 ) >= 10 and length $chain == 28;
|
|
}
|
|
|
|
$usedactions{$normalized} = $chainref = new_standard_chain '%' . $chain . $actionref->{actchain}++;
|
|
|
|
fatal_error "Too many invocations of Action $action" if $actionref->{actchain} > 99;
|
|
} else {
|
|
$usedactions{$normalized} = $chainref = new_standard_chain $chain;
|
|
}
|
|
|
|
$chainref->{action} = $normalized;
|
|
|
|
unless ( $targets{$action} & BUILTIN ) {
|
|
|
|
dont_optimize $chainref;
|
|
|
|
my $file = find_file $chain;
|
|
|
|
if ( -f $file ) {
|
|
progress_message "Running $file...";
|
|
|
|
my @params = split /,/, $param;
|
|
|
|
unless ( my $return = eval `cat $file` ) {
|
|
fatal_error "Couldn't parse $file: $@" if $@;
|
|
fatal_error "Couldn't do $file: $!" unless defined $return;
|
|
fatal_error "Couldn't run $file";
|
|
}
|
|
}
|
|
}
|
|
|
|
$chainref;
|
|
}
|
|
|
|
sub createsimpleactionchain( $ ) {
|
|
my $action = shift;
|
|
my $normalized = normalize_action_name( $action );
|
|
|
|
return createlogactionchain( $normalized, $action, 'none', '', '' ) if $filter_table->{$action} || $nat_table->{$action};
|
|
|
|
my $chainref = new_standard_chain $action;
|
|
|
|
$usedactions{$normalized} = $chainref;
|
|
|
|
$chainref->{action} = $normalized;
|
|
|
|
unless ( $targets{$action} & BUILTIN ) {
|
|
|
|
dont_optimize $chainref;
|
|
|
|
my $file = find_file $action;
|
|
|
|
if ( -f $file ) {
|
|
progress_message "Running $file...";
|
|
|
|
my ( $level, $tag ) = ( '', '' );
|
|
|
|
unless ( my $return = eval `cat $file` ) {
|
|
fatal_error "Couldn't parse $file: $@" if $@;
|
|
fatal_error "Couldn't do $file: $!" unless defined $return;
|
|
fatal_error "Couldn't run $file";
|
|
}
|
|
}
|
|
}
|
|
|
|
$chainref;
|
|
}
|
|
|
|
#
|
|
# Create an action chain and run its associated user exit
|
|
#
|
|
sub createactionchain( $ ) {
|
|
my $normalized = shift;
|
|
|
|
my ( $target, $level, $tag, $param ) = split /:/, $normalized, 4;
|
|
|
|
assert( defined $param );
|
|
|
|
my $chainref;
|
|
|
|
if ( $level eq 'none' && $tag eq '' && $param eq '' ) {
|
|
createsimpleactionchain $target;
|
|
} else {
|
|
createlogactionchain $normalized, $target , $level , $tag, $param;
|
|
}
|
|
}
|
|
|
|
#
|
|
# Mark an action as used and create its chain. Returns a reference to the chain if the chain was
|
|
# created on this call or 0 otherwise.
|
|
#
|
|
sub use_action( $ ) {
|
|
my $normalized = shift;
|
|
|
|
if ( $usedactions{$normalized} ) {
|
|
0;
|
|
} else {
|
|
createactionchain $normalized;
|
|
}
|
|
}
|
|
|
|
#
|
|
# This function determines the logging and params for a subordinate action or a rule within a superior action
|
|
#
|
|
sub merge_levels ($$) {
|
|
my ( $superior, $subordinate ) = @_;
|
|
|
|
my @supparts = split /:/, $superior;
|
|
my @subparts = split /:/, $subordinate;
|
|
|
|
my $subparts = @subparts;
|
|
|
|
my $target = $subparts[0];
|
|
|
|
push @subparts, '' while @subparts < 3; #Avoid undefined values
|
|
|
|
my $level = $supparts[1];
|
|
my $tag = $supparts[2];
|
|
|
|
if ( @supparts == 3 ) {
|
|
return "$target:none!:$tag" if $level eq 'none!';
|
|
return "$target:$level:$tag" if $level =~ /!$/;
|
|
return $subordinate if $subparts >= 2;
|
|
return "$target:$level:$tag";
|
|
}
|
|
|
|
if ( @supparts == 2 ) {
|
|
return "$target:none!" if $level eq 'none!';
|
|
return "$target:$level" if ($level =~ /!$/) || ($subparts < 2);
|
|
}
|
|
|
|
$subordinate;
|
|
}
|
|
|
|
#
|
|
# Try to find a macro file -- RETURNS false if the file doesn't exist or MACRO if it does.
|
|
# If the file exists, the macro is entered into the 'targets' table and the fully-qualified
|
|
# name of the file is stored in the 'macro' table.
|
|
#
|
|
sub find_macro( $ )
|
|
{
|
|
my $macro = $_[0];
|
|
my $macrofile = find_file "macro.$macro";
|
|
|
|
if ( -f $macrofile ) {
|
|
$macros{$macro} = $macrofile;
|
|
$targets{$macro} = MACRO;
|
|
} else {
|
|
0;
|
|
}
|
|
}
|
|
|
|
#
|
|
# This function substitutes the second argument for the first part of the first argument up to the first colon (":")
|
|
#
|
|
# Example:
|
|
#
|
|
# substitute_param DNAT PARAM:info:FTP
|
|
#
|
|
# produces "DNAT:info:FTP"
|
|
#
|
|
sub substitute_param( $$ ) {
|
|
my ( $param, $action ) = @_;
|
|
|
|
if ( $action =~ /:/ ) {
|
|
my $logpart = (split_action $action)[1];
|
|
$logpart =~ s!/$!!;
|
|
return "$param:$logpart";
|
|
}
|
|
|
|
$param;
|
|
}
|
|
|
|
#
|
|
# Combine fields from a macro body with one from the macro invocation
|
|
#
|
|
sub merge_macro_source_dest( $$ ) {
|
|
my ( $body, $invocation ) = @_;
|
|
|
|
if ( $invocation ) {
|
|
if ( $body ) {
|
|
return $body if $invocation eq '-';
|
|
return "$body:$invocation" if $invocation =~ /.*?\.*?\.|^\+|^!+|^~|^!~|~<|~\[/;
|
|
return "$invocation:$body";
|
|
}
|
|
|
|
return $invocation;
|
|
}
|
|
|
|
$body || '';
|
|
}
|
|
|
|
sub merge_macro_column( $$ ) {
|
|
my ( $body, $invocation ) = @_;
|
|
|
|
if ( supplied( $invocation ) && $invocation ne '-' ) {
|
|
$invocation;
|
|
} else {
|
|
$body;
|
|
}
|
|
}
|
|
|
|
#
|
|
# Get Macro Name -- strips away trailing /*, :* and (*) from the first column in a rule, macro or action.
|
|
#
|
|
sub isolate_basic_target( $ ) {
|
|
my $target = ( split '[/:]', $_[0])[0];
|
|
|
|
$target =~ /^(\w+)[(].*[)]$/ ? $1 : $target;
|
|
}
|
|
|
|
#
|
|
# Map pre-3.0 actions to the corresponding Macro invocation
|
|
#
|
|
|
|
sub find_old_action ( $$$ ) {
|
|
my ( $target, $macro, $param ) = @_;
|
|
|
|
if ( my $actiontype = find_macro( $macro ) ) {
|
|
( $macro, $actiontype , $param );
|
|
} else {
|
|
( $target, 0, '' );
|
|
}
|
|
}
|
|
|
|
sub map_old_actions( $ ) {
|
|
my $target = shift;
|
|
|
|
if ( $target =~ /^Allow(.*)$/ ) {
|
|
find_old_action( $target, $1, 'ACCEPT' );
|
|
} elsif ( $target =~ /^Drop(.*)$/ ) {
|
|
find_old_action( $target, $1, 'DROP' );
|
|
} elsif ( $target = /^Reject(.*)$/ ) {
|
|
find_old_action( $target, $1, 'REJECT' );
|
|
} else {
|
|
( $target, 0, '' );
|
|
}
|
|
}
|
|
|
|
#
|
|
# The following small functions generate rules for the builtin actions of the same name
|
|
#
|
|
sub dropBcast( $$$$ ) {
|
|
my ($chainref, $level, $tag, $audit) = @_;
|
|
|
|
my $target = require_audit ( 'DROP', $audit );
|
|
|
|
if ( have_capability( 'ADDRTYPE' ) ) {
|
|
if ( $level ne '' ) {
|
|
log_rule_limit $level, $chainref, 'dropBcast' , 'DROP', '', $tag, 'add', ' -m addrtype --dst-type BROADCAST ';
|
|
if ( $family == F_IPV4 ) {
|
|
log_rule_limit $level, $chainref, 'dropBcast' , 'DROP', '', $tag, 'add', ' -d 224.0.0.0/4 ';
|
|
} else {
|
|
log_rule_limit $level, $chainref, 'dropBcast' , 'DROP', '', $tag, 'add', join( ' ', ' -d' , IPv6_MULTICAST , '-j DROP ' );
|
|
}
|
|
}
|
|
|
|
add_ijump $chainref, j => $target, addrtype => '--dst-type BROADCAST';
|
|
} else {
|
|
if ( $family == F_IPV4 ) {
|
|
add_commands $chainref, 'for address in $ALL_BCASTS; do';
|
|
} else {
|
|
add_commands $chainref, 'for address in $ALL_ACASTS; do';
|
|
}
|
|
|
|
incr_cmd_level $chainref;
|
|
log_rule_limit $level, $chainref, 'dropBcast' , 'DROP', '', $tag, 'add', ' -d $address ' if $level ne '';
|
|
add_ijump $chainref, j => $target, d => '$address';
|
|
decr_cmd_level $chainref;
|
|
add_commands $chainref, 'done';
|
|
}
|
|
|
|
if ( $family == F_IPV4 ) {
|
|
log_rule_limit $level, $chainref, 'dropBcast' , 'DROP', '', $tag, 'add', ' -d 224.0.0.0/4 ' if $level ne '';
|
|
add_ijump $chainref, j => $target, d => '224.0.0.0/4';
|
|
} else {
|
|
log_rule_limit $level, $chainref, 'dropBcast' , 'DROP', '', $tag, 'add', join( ' ', ' -d' , IPv6_MULTICAST . ' ' ) if $level ne '';
|
|
add_ijump $chainref, j => $target, d => IPv6_MULTICAST;
|
|
}
|
|
}
|
|
|
|
sub allowBcast( $$$$ ) {
|
|
my ($chainref, $level, $tag, $audit) = @_;
|
|
|
|
my $target = require_audit( 'ACCEPT', $audit );
|
|
|
|
if ( $family == F_IPV4 && have_capability( 'ADDRTYPE' ) ) {
|
|
if ( $level ne '' ) {
|
|
log_rule_limit $level, $chainref, 'allowBcast' , 'ACCEPT', '', $tag, 'add', ' -m addrtype --dst-type BROADCAST ';
|
|
log_rule_limit $level, $chainref, 'allowBcast' , 'ACCEPT', '', $tag, 'add', ' -d 224.0.0.0/4 ';
|
|
}
|
|
|
|
add_ijump $chainref, j => $target, addrtype => '--dst-type BROADCAST';
|
|
} else {
|
|
if ( $family == F_IPV4 ) {
|
|
add_commands $chainref, 'for address in $ALL_BCASTS; do';
|
|
} else {
|
|
add_commands $chainref, 'for address in $ALL_MACASTS; do';
|
|
}
|
|
|
|
incr_cmd_level $chainref;
|
|
log_rule_limit $level, $chainref, 'allowBcast' , 'ACCEPT', '', $tag, 'add', ' -d $address ' if $level ne '';
|
|
add_ijump $chainref, j => $target, d => '$address';
|
|
decr_cmd_level $chainref;
|
|
add_commands $chainref, 'done';
|
|
}
|
|
|
|
if ( $family == F_IPV4 ) {
|
|
log_rule_limit $level, $chainref, 'allowBcast' , 'ACCEPT', '', $tag, 'add', ' -d 224.0.0.0/4 ' if $level ne '';
|
|
add_ijump $chainref, j => $target, d => '224.0.0.0/4';
|
|
} else {
|
|
log_rule_limit $level, $chainref, 'allowBcast' , 'ACCEPT', '', $tag, 'add', ' -d ' . IPv6_MULTICAST . ' ' if $level ne '';
|
|
add_ijump $chainref, j => $target, d => IPv6_MULTICAST;
|
|
}
|
|
}
|
|
|
|
sub dropNotSyn ( $$$$ ) {
|
|
my ($chainref, $level, $tag, $audit) = @_;
|
|
|
|
my $target = require_audit( 'DROP', $audit );
|
|
|
|
log_rule_limit $level, $chainref, 'dropNotSyn' , 'DROP', '', $tag, 'add', '-p 6 ! --syn ' if $level ne '';
|
|
add_ijump $chainref , j => $target, p => '6 ! --syn';
|
|
}
|
|
|
|
sub rejNotSyn ( $$$$ ) {
|
|
my ($chainref, $level, $tag, $audit) = @_;
|
|
|
|
my $target = 'REJECT --reject-with tcp-reset';
|
|
|
|
if ( supplied $audit ) {
|
|
$target = require_audit( 'REJECT' , $audit );
|
|
}
|
|
|
|
log_rule_limit $level, $chainref, 'rejNotSyn' , 'REJECT', '', $tag, 'add', '-p 6 ! --syn ' if $level ne '';
|
|
add_ijump $chainref , j => $target, p => '6 ! --syn';
|
|
}
|
|
|
|
sub dropInvalid ( $$$$ ) {
|
|
my ($chainref, $level, $tag, $audit) = @_;
|
|
|
|
my $target = require_audit( 'DROP', $audit );
|
|
|
|
log_rule_limit $level, $chainref, 'dropInvalid' , 'DROP', '', $tag, 'add', "$globals{STATEMATCH} INVALID " if $level ne '';
|
|
add_ijump $chainref , j => $target, state_imatch 'INVALID';
|
|
}
|
|
|
|
sub allowInvalid ( $$$$ ) {
|
|
my ($chainref, $level, $tag, $audit) = @_;
|
|
|
|
my $target = require_audit( 'ACCEPT', $audit );
|
|
|
|
log_rule_limit $level, $chainref, 'allowInvalid' , 'ACCEPT', '', $tag, 'add', "$globals{STATEMATCH} INVALID " if $level ne '';
|
|
add_ijump $chainref , j => $target, state_imatch 'INVALID';
|
|
}
|
|
|
|
sub forwardUPnP ( $$$$ ) {
|
|
my $chainref = dont_optimize 'forwardUPnP';
|
|
|
|
add_commands( $chainref , '[ -f ${VARDIR}/.forwardUPnP ] && cat ${VARDIR}/.forwardUPnP >&3' );
|
|
}
|
|
|
|
sub allowinUPnP ( $$$$ ) {
|
|
my ($chainref, $level, $tag, $audit) = @_;
|
|
|
|
my $target = require_audit( 'ACCEPT', $audit );
|
|
|
|
if ( $level ne '' ) {
|
|
log_rule_limit $level, $chainref, 'allowinUPnP' , 'ACCEPT', '', $tag, 'add', '-p 17 --dport 1900 ';
|
|
log_rule_limit $level, $chainref, 'allowinUPnP' , 'ACCEPT', '', $tag, 'add', '-p 6 --dport 49152 ';
|
|
}
|
|
|
|
add_ijump $chainref, j => $target, p => '17 --dport 1900';
|
|
add_ijump $chainref, j => $target, p => '6 --dport 49152';
|
|
}
|
|
|
|
sub Limit( $$$$ ) {
|
|
my ($chainref, $level, $tag, $param ) = @_;
|
|
|
|
my @param;
|
|
|
|
if ( $param ) {
|
|
@param = split /,/, $param;
|
|
} else {
|
|
@param = split /,/, $tag;
|
|
$tag = '';
|
|
}
|
|
|
|
fatal_error 'Limit rules must include <set name>,<max connections>,<interval> as the log tag or as parameters' unless @param == 3;
|
|
|
|
my $set = $param[0];
|
|
|
|
for ( @param[1,2] ) {
|
|
fatal_error 'Max connections and interval in Limit rules must be numeric (' . join( ':', 'Limit', $level eq '' ? 'none' : $level, $tag ) . ')' unless /^\d+$/
|
|
}
|
|
|
|
my $count = $param[1] + 1;
|
|
|
|
require_capability( 'RECENT_MATCH' , 'Limit rules' , '' );
|
|
|
|
add_irule $chainref, recent => "--name $set --set";
|
|
|
|
if ( $level ne '' ) {
|
|
my $xchainref = new_chain 'filter' , "$chainref->{name}%";
|
|
log_rule_limit $level, $xchainref, $param[0], 'DROP', '', $tag, 'add', '';
|
|
add_ijump $xchainref, j => 'DROP';
|
|
add_ijump $chainref, j => $xchainref, recent => "--name $set --update --seconds $param[2] --hitcount $count";
|
|
} else {
|
|
add_ijump $chainref, j => 'DROP', recent => "--update --name $set --seconds $param[2] --hitcount $count";
|
|
}
|
|
|
|
add_ijump $chainref, j => 'ACCEPT';
|
|
}
|
|
|
|
my %builtinops = ( 'dropBcast' => \&dropBcast,
|
|
'allowBcast' => \&allowBcast,
|
|
'dropNotSyn' => \&dropNotSyn,
|
|
'rejNotSyn' => \&rejNotSyn,
|
|
'dropInvalid' => \&dropInvalid,
|
|
'allowInvalid' => \&allowInvalid,
|
|
'allowinUPnP' => \&allowinUPnP,
|
|
'forwardUPnP' => \&forwardUPnP,
|
|
'Limit' => \&Limit,
|
|
);
|
|
|
|
#
|
|
# This function is called prior to processing of the policy file. It:
|
|
#
|
|
# - Adds the builtin actions to the target table
|
|
# - Reads actions.std and actions (in that order) and for each entry:
|
|
# o Adds the action to the target table
|
|
# o Verifies that the corresponding action file exists
|
|
#
|
|
|
|
sub process_actions() {
|
|
|
|
progress_message2 "Locating Action Files...";
|
|
#
|
|
# Add built-in actions to the target table and create those actions
|
|
#
|
|
$targets{$_} = new_action( $_ , ACTION + BUILTIN ) for @builtins;
|
|
|
|
for my $file ( qw/actions.std actions/ ) {
|
|
open_file $file;
|
|
|
|
while ( read_a_line ) {
|
|
my ( $action ) = split_line 'action file' , { action => 0 };
|
|
|
|
if ( $action =~ /:/ ) {
|
|
warning_message 'Default Actions are now specified in /etc/shorewall/shorewall.conf';
|
|
$action =~ s/:.*$//;
|
|
}
|
|
|
|
fatal_error "Invalid Action Name ($action)" unless $action =~ /^[\w-]+$/;
|
|
|
|
if ( $targets{$action} ) {
|
|
warning_message "Duplicate Action Name ($action) Ignored" unless $targets{$action} & ACTION;
|
|
next;
|
|
}
|
|
|
|
fatal_error "Invalid Action Name ($action)" unless "\L$action" =~ /^[a-z]\w*$/;
|
|
|
|
new_action $action, ACTION;
|
|
|
|
my $actionfile = find_file "action.$action";
|
|
|
|
fatal_error "Missing Action File ($actionfile)" unless -f $actionfile;
|
|
}
|
|
}
|
|
|
|
my $ref;
|
|
|
|
}
|
|
|
|
sub process_rule1 ( $$$$$$$$$$$$$$$$$ );
|
|
|
|
#
|
|
# Populate an action invocation chain. As new action tuples are encountered,
|
|
# the function will be called recursively by process_rules_common().
|
|
#
|
|
sub process_action( $) {
|
|
my $chainref = shift;
|
|
my $wholeaction = $chainref->{action};
|
|
my ( $action, $level, $tag, $param ) = split /:/, $wholeaction, 4;
|
|
|
|
if ( $targets{$action} & BUILTIN ) {
|
|
$level = '' if $level =~ /none!?/;
|
|
$builtinops{$action}->( $chainref, $level, $tag, $param );
|
|
} else {
|
|
my $actionfile = find_file "action.$action";
|
|
my $format = 1;
|
|
|
|
fatal_error "Missing Action File ($actionfile)" unless -f $actionfile;
|
|
|
|
progress_message2 "$doing $actionfile for chain $chainref->{name}...";
|
|
|
|
push_open $actionfile;
|
|
|
|
my $oldparms = push_action_params( $chainref, $param );
|
|
|
|
$active{$wholeaction}++;
|
|
push @actionstack, $wholeaction;
|
|
|
|
push_comment( '' );
|
|
|
|
while ( read_a_line ) {
|
|
|
|
my ($target, $source, $dest, $proto, $ports, $sports, $origdest, $rate, $user, $mark, $connlimit, $time, $headers, $condition );
|
|
|
|
if ( $format == 1 ) {
|
|
($target, $source, $dest, $proto, $ports, $sports, $rate, $user, $mark ) =
|
|
split_line1 'action file', { target => 0, source => 1, dest => 2, proto => 3, dport => 4, sport => 5, rate => 6, user => 7, mark => 8 }, $rule_commands;
|
|
$origdest = $connlimit = $time = $headers = $condition = '-';
|
|
} else {
|
|
($target, $source, $dest, $proto, $ports, $sports, $origdest, $rate, $user, $mark, $connlimit, $time, $headers, $condition )
|
|
= split_line1 'action file', \%rulecolumns, $action_commands;
|
|
}
|
|
|
|
fatal_error 'TARGET must be specified' if $target eq '-';
|
|
|
|
if ( $target eq 'COMMENT' ) {
|
|
process_comment;
|
|
next;
|
|
}
|
|
|
|
if ( $target eq 'FORMAT' ) {
|
|
fatal_error "FORMAT must be 1 or 2" unless $source =~ /^[12]$/;
|
|
$format = $source;
|
|
next;
|
|
}
|
|
|
|
if ( $target eq 'DEFAULTS' ) {
|
|
default_action_params( $action, split_list $source, 'defaults' ), next if $format == 2;
|
|
fatal_error 'DEFAULTS only allowed in FORMAT-2 actions';
|
|
}
|
|
|
|
process_rule1( $chainref,
|
|
merge_levels( "$action:$level:$tag", $target ),
|
|
'',
|
|
$source,
|
|
$dest,
|
|
$proto,
|
|
$ports,
|
|
$sports,
|
|
$origdest,
|
|
$rate,
|
|
$user,
|
|
$mark,
|
|
$connlimit,
|
|
$time,
|
|
$headers,
|
|
$condition,
|
|
0 );
|
|
}
|
|
|
|
pop_comment;
|
|
|
|
$active{$wholeaction}--;
|
|
pop @actionstack;
|
|
|
|
pop_open;
|
|
|
|
pop_action_params( $oldparms );
|
|
}
|
|
}
|
|
|
|
#
|
|
# Create a policy action if it doesn't already exist
|
|
#
|
|
sub use_policy_action( $ ) {
|
|
my $ref = use_action( $_[0] );
|
|
|
|
process_action( $ref ) if $ref;
|
|
}
|
|
|
|
################################################################################
|
|
# End of functions moved from the Actions module in 4.4.16
|
|
################################################################################
|
|
#
|
|
# Expand a macro rule from the rules file
|
|
#
|
|
sub process_macro ( $$$$$$$$$$$$$$$$$$ ) {
|
|
my ($macro, $chainref, $target, $param, $source, $dest, $proto, $ports, $sports, $origdest, $rate, $user, $mark, $connlimit, $time, $headers, $condition, $wildcard ) = @_;
|
|
|
|
my $nocomment = no_comment;
|
|
|
|
my $format = 1;
|
|
|
|
my $generated = 0;
|
|
|
|
macro_comment $macro;
|
|
|
|
my $macrofile = $macros{$macro};
|
|
|
|
progress_message "..Expanding Macro $macrofile...";
|
|
|
|
push_open $macrofile;
|
|
|
|
while ( read_a_line ) {
|
|
|
|
my ( $mtarget, $msource, $mdest, $mproto, $mports, $msports, $morigdest, $mrate, $muser, $mmark, $mconnlimit, $mtime, $mheaders, $mcondition );
|
|
|
|
if ( $format == 1 ) {
|
|
( $mtarget, $msource, $mdest, $mproto, $mports, $msports, $mrate, $muser ) = split_line1 'macro file', \%rulecolumns, $rule_commands;
|
|
( $morigdest, $mmark, $mconnlimit, $mtime, $mheaders, $mcondition ) = qw/- - - - - -/;
|
|
} else {
|
|
( $mtarget, $msource, $mdest, $mproto, $mports, $msports, $morigdest, $mrate, $muser, $mmark, $mconnlimit, $mtime, $mheaders, $mcondition ) = split_line1 'macro file', \%rulecolumns, $rule_commands;
|
|
}
|
|
|
|
fatal_error 'TARGET must be specified' if $mtarget eq '-';
|
|
|
|
if ( $mtarget eq 'COMMENT' ) {
|
|
process_comment unless $nocomment;
|
|
next;
|
|
}
|
|
|
|
if ( $mtarget eq 'FORMAT' ) {
|
|
fatal_error "Invalid FORMAT ($msource)" unless $msource =~ /^[12]$/;
|
|
$format = $msource;
|
|
next;
|
|
}
|
|
|
|
if ( $mtarget eq 'DEFAULT' ) {
|
|
$param = $msource unless supplied $param;
|
|
next;
|
|
}
|
|
|
|
$mtarget = merge_levels $target, $mtarget;
|
|
|
|
if ( $mtarget =~ /^PARAM(:.*)?$/ ) {
|
|
fatal_error 'PARAM requires a parameter to be supplied in macro invocation' unless $param ne '';
|
|
$mtarget = substitute_param $param, $mtarget;
|
|
}
|
|
|
|
my $action = isolate_basic_target $mtarget;
|
|
|
|
fatal_error "Invalid or missing ACTION ($mtarget)" unless defined $action;
|
|
|
|
my $actiontype = $targets{$action} || find_macro( $action );
|
|
|
|
fatal_error "Invalid Action ($mtarget) in macro" unless $actiontype & ( ACTION + STANDARD + NATRULE + MACRO );
|
|
|
|
if ( $msource ) {
|
|
if ( $msource eq '-' ) {
|
|
$msource = $source || '';
|
|
} elsif ( $msource =~ s/^DEST:?// ) {
|
|
$msource = merge_macro_source_dest $msource, $dest;
|
|
} else {
|
|
$msource =~ s/^SOURCE:?//;
|
|
$msource = merge_macro_source_dest $msource, $source;
|
|
}
|
|
} else {
|
|
$msource = '';
|
|
}
|
|
|
|
if ( $mdest ) {
|
|
if ( $mdest eq '-' ) {
|
|
$mdest = $dest || '';
|
|
} elsif ( $mdest =~ s/^SOURCE:?// ) {
|
|
$mdest = merge_macro_source_dest $mdest , $source;
|
|
} else {
|
|
$mdest =~ s/DEST:?//;
|
|
$mdest = merge_macro_source_dest $mdest, $dest;
|
|
}
|
|
} else {
|
|
$mdest = '';
|
|
}
|
|
|
|
$generated |= process_rule1(
|
|
$chainref,
|
|
$mtarget,
|
|
$param,
|
|
$msource,
|
|
$mdest,
|
|
merge_macro_column( $mproto, $proto ) ,
|
|
merge_macro_column( $mports, $ports ) ,
|
|
merge_macro_column( $msports, $sports ) ,
|
|
merge_macro_column( $morigdest, $origdest ) ,
|
|
merge_macro_column( $mrate, $rate ) ,
|
|
merge_macro_column( $muser, $user ) ,
|
|
merge_macro_column( $mmark, $mark ) ,
|
|
merge_macro_column( $mconnlimit, $connlimit) ,
|
|
merge_macro_column( $mtime, $time ),
|
|
merge_macro_column( $mheaders, $headers ),
|
|
merge_macro_column( $mcondition, $condition ),
|
|
$wildcard
|
|
);
|
|
|
|
progress_message " Rule \"$currentline\" $done";
|
|
}
|
|
|
|
pop_open;
|
|
|
|
progress_message "..End Macro $macrofile";
|
|
|
|
clear_comment unless $nocomment;
|
|
|
|
return $generated;
|
|
}
|
|
|
|
#
|
|
# Confirm that we have AUDIT_TARGET capability and ensure the appropriate AUDIT chain.
|
|
#
|
|
sub verify_audit($;$$) {
|
|
my ($target, $audit, $tgt ) = @_;
|
|
|
|
require_capability 'AUDIT_TARGET', "$target rules", '';
|
|
|
|
return ensure_audit_chain $target, $audit, $tgt;
|
|
}
|
|
|
|
#
|
|
# Once a rule has been expanded via wildcards (source and/or dest zone eq 'all'), it is processed by this function. If
|
|
# the target is a macro, the macro is expanded and this function is called recursively for each rule in the expansion.
|
|
# Similarly, if a new action tuple is encountered, this function is called recursively for each rule in the action
|
|
# body. In this latter case, a reference to the tuple's chain is passed in the first ($chainref) argument.
|
|
#
|
|
sub process_rule1 ( $$$$$$$$$$$$$$$$ $) {
|
|
my ( $chainref, #reference to Action Chain if we are being called from process_action(); undef otherwise
|
|
$target,
|
|
$current_param,
|
|
$source,
|
|
$dest,
|
|
$proto,
|
|
$ports,
|
|
$sports,
|
|
$origdest,
|
|
$ratelimit,
|
|
$user,
|
|
$mark,
|
|
$connlimit,
|
|
$time,
|
|
$headers,
|
|
$condition,
|
|
$wildcard ) = @_;
|
|
|
|
my ( $action, $loglevel) = split_action $target;
|
|
my ( $basictarget, $param ) = get_target_param $action;
|
|
my $rule = '';
|
|
my $optimize = $wildcard ? ( $basictarget =~ /!$/ ? 0 : $config{OPTIMIZE} & 1 ) : 0;
|
|
my $inaction = '';
|
|
my $normalized_target;
|
|
my $normalized_action;
|
|
my $blacklist = ( $section eq 'BLACKLIST' );
|
|
|
|
( $inaction, undef, undef, undef ) = split /:/, $normalized_action = $chainref->{action}, 4 if defined $chainref;
|
|
|
|
$param = '' unless defined $param;
|
|
|
|
#
|
|
# Determine the validity of the action
|
|
#
|
|
my $actiontype = $targets{$basictarget} || find_macro ( $basictarget );
|
|
|
|
if ( $config{ MAPOLDACTIONS } ) {
|
|
( $basictarget, $actiontype , $param ) = map_old_actions( $basictarget ) unless $actiontype || $param;
|
|
}
|
|
|
|
fatal_error "Unknown ACTION ($action)" unless $actiontype;
|
|
|
|
if ( $actiontype == MACRO ) {
|
|
#
|
|
# process_macro() will call process_rule1() recursively for each rule in the macro body
|
|
#
|
|
fatal_error "Macro invocations nested too deeply" if ++$macro_nest_level > MAX_MACRO_NEST_LEVEL;
|
|
|
|
if ( $param ne '' ) {
|
|
$current_param = $param unless $param eq 'PARAM';
|
|
}
|
|
|
|
my $generated = process_macro( $basictarget,
|
|
$chainref,
|
|
$target,
|
|
$current_param,
|
|
$source,
|
|
$dest,
|
|
$proto,
|
|
$ports,
|
|
$sports,
|
|
$origdest,
|
|
$ratelimit,
|
|
$user,
|
|
$mark,
|
|
$connlimit,
|
|
$time,
|
|
$headers,
|
|
$condition,
|
|
$wildcard );
|
|
|
|
$macro_nest_level--;
|
|
|
|
return $generated;
|
|
|
|
} elsif ( $actiontype & NFQ ) {
|
|
require_capability( 'NFQUEUE_TARGET', 'NFQUEUE Rules', '' );
|
|
my $paramval = $param eq '' ? 0 : numeric_value( $param );
|
|
fatal_error "Invalid value ($param) for NFQUEUE queue number" unless defined($paramval) && $paramval <= 65535;
|
|
$action = "NFQUEUE --queue-num $paramval";
|
|
} elsif ( $actiontype & SET ) {
|
|
require_capability( 'IPSET_MATCH', 'SET and UNSET rules', '' );
|
|
fatal_error "$action rules require a set name parameter" unless $param;
|
|
} elsif ( $actiontype & ACTION ) {
|
|
split_list $param, 'Action parameter';
|
|
} else {
|
|
fatal_error "The $basictarget TARGET does not accept a parameter" unless $param eq '';
|
|
}
|
|
|
|
#
|
|
# We can now dispense with the postfix character
|
|
#
|
|
fatal_error "The +, - and ! modifiers are not allowed in the bllist file or in the BLACKLIST section" if $action =~ s/[\+\-!]$// && $blacklist;
|
|
#
|
|
# Handle actions
|
|
#
|
|
if ( $actiontype & ACTION ) {
|
|
#
|
|
# Create the action:level:tag:param tuple.
|
|
#
|
|
$normalized_target = normalize_action( $basictarget, $loglevel, $param );
|
|
|
|
fatal_error( "Action $basictarget invoked Recursively (" . join( '->', map( externalize( $_ ), @actionstack , $normalized_target ) ) . ')' ) if $active{$normalized_target};
|
|
|
|
if ( my $ref = use_action( $normalized_target ) ) {
|
|
#
|
|
# First reference to this tuple
|
|
#
|
|
process_action( $ref );
|
|
#
|
|
# Processing the action may determine that the action or one of it's dependents does NAT, so:
|
|
#
|
|
# - Refresh $actiontype
|
|
# - Create the associate nat table chain if appropriate.
|
|
#
|
|
ensure_chain( 'nat', $ref->{name} ) if ( $actiontype = $targets{$basictarget} ) & NATRULE;
|
|
}
|
|
|
|
$action = $basictarget; # Remove params, if any, from $action.
|
|
} else {
|
|
#
|
|
# Catch empty parameter list
|
|
#
|
|
fatal_error "The $basictarget TARGET does not accept parameters" if $action =~ s/\(\)$//;
|
|
}
|
|
|
|
if ( $actiontype & (NATRULE | NONAT | NATONLY ) ) {
|
|
$targets{$inaction} |= NATRULE if $inaction;
|
|
fatal_error "NAT rules are only allowed in the NEW section" unless $section eq 'NEW';
|
|
}
|
|
#
|
|
# Take care of irregular syntax and targets
|
|
#
|
|
my $log_action = $action;
|
|
|
|
unless ( $actiontype & ( ACTION | MACRO | NFQ | CHAIN ) ) {
|
|
my $bt = $basictarget;
|
|
|
|
$bt =~ s/[-+!]$//;
|
|
|
|
my %functions = ( ACCEPT => sub() { $action = 'RETURN' if $blacklist; } ,
|
|
|
|
REDIRECT => sub () {
|
|
my $z = $actiontype & NATONLY ? '' : firewall_zone;
|
|
if ( $dest eq '-' ) {
|
|
$dest = $inaction ? '' : join( '', $z, '::' , $ports =~ /[:,]/ ? '' : $ports );
|
|
} elsif ( $inaction ) {
|
|
$dest = ":$dest";
|
|
} else {
|
|
$dest = join( '', $z, '::', $dest ) unless $dest =~ /^[^\d].*:/;
|
|
}
|
|
} ,
|
|
|
|
REJECT => sub { $action = 'reject'; } ,
|
|
|
|
CONTINUE => sub { $action = 'RETURN'; } ,
|
|
|
|
WHITELIST => sub {
|
|
fatal_error "'WHITELIST' may only be used in the blrules file and in the 'BLACKLIST' section" unless $blacklist;
|
|
$action = 'RETURN';
|
|
} ,
|
|
|
|
COUNT => sub { $action = ''; } ,
|
|
|
|
LOG => sub { fatal_error 'LOG requires a log level' unless supplied $loglevel; } ,
|
|
);
|
|
|
|
my $function = $functions{ $bt };
|
|
|
|
if ( $function ) {
|
|
$function->();
|
|
} elsif ( $actiontype & SET ) {
|
|
my %xlate = ( ADD => 'add-set' , DEL => 'del-set' );
|
|
|
|
my ( $setname, $flags, $rest ) = split ':', $param, 3;
|
|
fatal_error "Invalid ADD/DEL parameter ($param)" if $rest;
|
|
fatal_error "Expected ipset name ($setname)" unless $setname =~ s/^\+// && $setname =~ /^[a-zA-Z]\w*$/;
|
|
fatal_error "Invalid flags ($flags)" unless defined $flags && $flags =~ /^(dst|src)(,(dst|src)){0,5}$/;
|
|
$action = join( ' ', 'SET --' . $xlate{$basictarget} , $setname , $flags );
|
|
}
|
|
}
|
|
#
|
|
# Isolate and validate source and destination zones
|
|
#
|
|
my $sourcezone = '-';
|
|
my $destzone = '-';
|
|
my $sourceref;
|
|
my $destref;
|
|
my $origdstports;
|
|
|
|
unless ( $inaction ) {
|
|
if ( $source =~ /^(.+?):(.*)/ ) {
|
|
fatal_error "Missing SOURCE Qualifier ($source)" if $2 eq '';
|
|
$sourcezone = $1;
|
|
$source = $2;
|
|
} else {
|
|
$sourcezone = $source;
|
|
$source = ALLIP;
|
|
}
|
|
|
|
if ( $dest =~ /^(.*?):(.*)/ ) {
|
|
fatal_error "Missing DEST Qualifier ($dest)" if $2 eq '';
|
|
$destzone = $1;
|
|
$dest = $2;
|
|
} elsif ( $dest =~ /.*\..*\./ ) {
|
|
#
|
|
# Appears to be an IPv4 address (no NAT in IPv6)
|
|
#
|
|
$destzone = '-';
|
|
} else {
|
|
$destzone = $dest;
|
|
$dest = ALLIP;
|
|
}
|
|
|
|
fatal_error "Missing source zone" if $sourcezone eq '-' || $sourcezone =~ /^:/;
|
|
fatal_error "Unknown source zone ($sourcezone)" unless $sourceref = defined_zone( $sourcezone );
|
|
fatal_error 'USER/GROUP may only be specified when the SOURCE zone is $FW' unless $user eq '-' || $sourcezone eq firewall_zone;
|
|
}
|
|
|
|
if ( $actiontype & NATONLY ) {
|
|
unless ( $destzone eq '-' || $destzone eq '' ) {
|
|
$destref = defined_zone( $destzone );
|
|
|
|
if ( $destref ) {
|
|
warning_message "The destination zone ($destzone) is ignored in $log_action rules";
|
|
} else {
|
|
$dest = join ':', $destzone, $dest;
|
|
$destzone = '';
|
|
}
|
|
}
|
|
} else {
|
|
unless ( $inaction ) {
|
|
fatal_error "Missing destination zone" if $destzone eq '-' || $destzone eq '';
|
|
fatal_error "Unknown destination zone ($destzone)" unless $destref = defined_zone( $destzone );
|
|
}
|
|
}
|
|
|
|
my $restriction = NO_RESTRICT;
|
|
|
|
unless ( $inaction ) {
|
|
if ( $sourceref && ( $sourceref->{type} & ( FIREWALL | VSERVER ) ) ) {
|
|
$restriction = $destref && ( $destref->{type} & ( FIREWALL | VSERVER ) ) ? ALL_RESTRICT : OUTPUT_RESTRICT;
|
|
} else {
|
|
$restriction = INPUT_RESTRICT if $destref && ( $destref->{type} & ( FIREWALL | VSERVER ) );
|
|
}
|
|
}
|
|
|
|
#
|
|
# For compatibility with older Shorewall versions
|
|
#
|
|
$origdest = ALLIP if $origdest eq 'all';
|
|
|
|
#
|
|
# Take care of chain
|
|
#
|
|
my ( $chain, $policy );
|
|
|
|
if ( $inaction ) {
|
|
#
|
|
# We are generating rules in an action chain -- the chain name is the name of that action chain
|
|
#
|
|
$chain = $chainref->{name};
|
|
} else {
|
|
unless ( $actiontype & NATONLY ) {
|
|
#
|
|
# Check for illegal bridge port rule
|
|
#
|
|
if ( $destref->{type} & BPORT ) {
|
|
unless ( $sourceref->{bridge} eq $destref->{bridge} || single_interface( $sourcezone ) eq $destref->{bridge} ) {
|
|
return 0 if $wildcard;
|
|
fatal_error "Rules with a DESTINATION Bridge Port zone must have a SOURCE zone on the same bridge";
|
|
}
|
|
}
|
|
|
|
$chain = rules_chain( ${sourcezone}, ${destzone} );
|
|
#
|
|
# Ensure that the chain exists but don't mark it as referenced until after optimization is checked
|
|
#
|
|
$chainref = ensure_chain 'filter', $chain;
|
|
$policy = $chainref->{policy};
|
|
|
|
if ( $policy eq 'NONE' ) {
|
|
return 0 if $wildcard;
|
|
fatal_error "Rules may not override a NONE policy";
|
|
}
|
|
#
|
|
# Handle Optimization
|
|
#
|
|
if ( $optimize > 0 && $section eq 'NEW' ) {
|
|
my $loglevel = $filter_table->{$chainref->{policychain}}{loglevel};
|
|
if ( $loglevel ne '' ) {
|
|
return 0 if $target eq "${policy}:$loglevel}";
|
|
} else {
|
|
return 0 if $basictarget eq $policy;
|
|
}
|
|
}
|
|
#
|
|
# Mark the chain as referenced and add appropriate rules from earlier sections.
|
|
#
|
|
$chainref = ensure_rules_chain $chain;
|
|
#
|
|
# Handle use of the blacklist chain
|
|
#
|
|
if ( $blacklist ) {
|
|
my $blacklistchain = blacklist_chain( ${sourcezone}, ${destzone} );
|
|
my $blacklistref = $filter_table->{$blacklistchain};
|
|
|
|
unless ( $blacklistref ) {
|
|
my @state;
|
|
$blacklistref = new_chain 'filter', $blacklistchain;
|
|
$blacklistref->{blacklistsection} = 1;
|
|
@state = state_imatch( 'NEW,INVALID' ) if $config{BLACKLISTNEWONLY};
|
|
add_ijump( $chainref, j => $blacklistref, @state );
|
|
}
|
|
|
|
$chain = $blacklistchain;
|
|
$chainref = $blacklistref;
|
|
}
|
|
}
|
|
}
|
|
#
|
|
# Generate Fixed part of the rule
|
|
#
|
|
if ( $actiontype & ( NATRULE | NONAT ) && ! ( $actiontype & NATONLY ) ) {
|
|
#
|
|
# Either a DNAT, REDIRECT or ACCEPT+ rule or an Action with NAT;
|
|
# don't apply rate limiting twice
|
|
#
|
|
$rule = join( '',
|
|
do_proto($proto, $ports, $sports),
|
|
do_user( $user ) ,
|
|
do_test( $mark , $globals{TC_MASK} ) ,
|
|
do_connlimit( $connlimit ),
|
|
do_time( $time ) ,
|
|
do_headers( $headers ) ,
|
|
do_condition( $condition ) ,
|
|
);
|
|
} else {
|
|
$rule = join( '',
|
|
do_proto($proto, $ports, $sports),
|
|
do_ratelimit( $ratelimit, $basictarget ) ,
|
|
do_user( $user ) ,
|
|
do_test( $mark , $globals{TC_MASK} ) ,
|
|
do_connlimit( $connlimit ),
|
|
do_time( $time ) ,
|
|
do_headers( $headers ) ,
|
|
do_condition( $condition ) ,
|
|
);
|
|
}
|
|
|
|
unless ( $section eq 'NEW' || $inaction ) {
|
|
if ( $config{FASTACCEPT} ) {
|
|
fatal_error "Entries in the $section SECTION of the rules file not permitted with FASTACCEPT=Yes" unless $section eq 'RELATED' && ( $config{RELATED_DISPOSITION} ne 'ACCEPT' || $config{RELATED_LOG_LEVEL} )
|
|
}
|
|
|
|
fatal_error "$basictarget rules are not allowed in the $section SECTION" if $actiontype & ( NATRULE | NONAT );
|
|
$rule .= "$globals{STATEMATCH} $section " unless $section eq 'ALL' || $blacklist;
|
|
}
|
|
|
|
#
|
|
# Generate NAT rule(s), if any
|
|
#
|
|
if ( $actiontype & NATRULE ) {
|
|
my ( $server, $serverport );
|
|
my $randomize = $dest =~ s/:random$// ? ' --random' : '';
|
|
|
|
require_capability( 'NAT_ENABLED' , "$basictarget rules", '' );
|
|
#
|
|
# Isolate server port
|
|
#
|
|
if ( $dest =~ /^(.*)(:(.+))$/ ) {
|
|
#
|
|
# Server IP and Port
|
|
#
|
|
$server = $1; # May be empty
|
|
$serverport = $3; # Not Empty due to RE
|
|
$origdstports = $ports;
|
|
|
|
if ( $origdstports && $origdstports ne '-' && port_count( $origdstports ) == 1 ) {
|
|
$origdstports = validate_port( $proto, $origdstports );
|
|
} else {
|
|
$origdstports = '';
|
|
}
|
|
|
|
if ( $serverport =~ /^(\d+)-(\d+)$/ ) {
|
|
#
|
|
# Server Port Range
|
|
#
|
|
fatal_error "Invalid port range ($serverport)" unless $1 < $2;
|
|
my @ports = ( $1, $2 );
|
|
$_ = validate_port( proto_name( $proto ), $_) for ( @ports );
|
|
( $ports = $serverport ) =~ tr/-/:/;
|
|
} else {
|
|
$serverport = $ports = validate_port( proto_name( $proto ), $serverport );
|
|
}
|
|
} elsif ( $dest eq ':' ) {
|
|
#
|
|
# Rule with no server IP or port ( zone:: )
|
|
#
|
|
$server = $serverport = '';
|
|
} else {
|
|
#
|
|
# Simple server IP address (may be empty or "-")
|
|
#
|
|
$server = $dest;
|
|
$serverport = '';
|
|
}
|
|
|
|
#
|
|
# Generate the target
|
|
#
|
|
my $target = '';
|
|
|
|
if ( $actiontype & REDIRECT ) {
|
|
fatal_error "A server IP address ($server) may not be specified in a REDIRECT rule" if $server;
|
|
$target = 'REDIRECT';
|
|
$target .= " --to-port $serverport" if $serverport;
|
|
if ( $origdest eq '' || $origdest eq '-' ) {
|
|
$origdest = ALLIP;
|
|
} elsif ( $origdest eq 'detect' ) {
|
|
fatal_error 'ORIGINAL DEST "detect" is invalid in an action' if $inaction;
|
|
|
|
if ( $config{DETECT_DNAT_IPADDRS} && $sourcezone ne firewall_zone ) {
|
|
my $interfacesref = $sourceref->{interfaces};
|
|
my @interfaces = keys %$interfacesref;
|
|
$origdest = @interfaces ? "detect:@interfaces" : ALLIP;
|
|
} else {
|
|
$origdest = ALLIP;
|
|
}
|
|
}
|
|
} elsif ( $actiontype & ACTION ) {
|
|
fatal_error "A server port ($serverport) is not allowed in $action rule" if $serverport;
|
|
$target = $usedactions{$normalized_target}->{name};
|
|
$loglevel = '';
|
|
} else {
|
|
if ( $server eq '' ) {
|
|
fatal_error "A server and/or port must be specified in the DEST column in $action rules" unless $serverport;
|
|
} elsif ( $server =~ /^(.+)-(.+)$/ ) {
|
|
validate_range( $1, $2 );
|
|
} else {
|
|
unless ( ( $actiontype & ACTION ) && $server eq ALLIP ) {
|
|
my @servers = validate_address $server, 1;
|
|
$server = join ',', @servers;
|
|
}
|
|
}
|
|
|
|
if ( $action eq 'DNAT' ) {
|
|
$target = 'DNAT';
|
|
if ( $server ) {
|
|
$serverport = ":$serverport" if $serverport;
|
|
for my $serv ( split /,/, $server ) {
|
|
$target .= " --to-destination ${serv}${serverport}";
|
|
}
|
|
} else {
|
|
$target .= " --to-destination :$serverport";
|
|
}
|
|
}
|
|
|
|
unless ( $origdest && $origdest ne '-' && $origdest ne 'detect' ) {
|
|
if ( ! $inaction && $config{DETECT_DNAT_IPADDRS} && $sourcezone ne firewall_zone ) {
|
|
my $interfacesref = $sourceref->{interfaces};
|
|
my @interfaces = keys %$interfacesref;
|
|
$origdest = @interfaces ? "detect:@interfaces" : ALLIP;
|
|
} else {
|
|
$origdest = ALLIP;
|
|
}
|
|
}
|
|
}
|
|
|
|
$target .= $randomize;
|
|
|
|
#
|
|
# And generate the nat table rule(s)
|
|
#
|
|
expand_rule ( ensure_chain ('nat' , $inaction ? $chain : $sourceref->{type} == FIREWALL ? 'OUTPUT' : dnat_chain $sourcezone ),
|
|
PREROUTE_RESTRICT ,
|
|
$rule ,
|
|
$source ,
|
|
$origdest ,
|
|
'' ,
|
|
$target ,
|
|
$loglevel ,
|
|
$log_action ,
|
|
$serverport ? do_proto( $proto, '', '' ) : '',
|
|
);
|
|
#
|
|
# After NAT:
|
|
# - the destination port will be the server port ($ports) -- we did that above
|
|
# - the destination IP will be the server IP ($dest)
|
|
# - there will be no log level (we log NAT rules in the nat table rather than in the filter table).
|
|
# - the target will be ACCEPT.
|
|
#
|
|
unless ( $actiontype & NATONLY ) {
|
|
$rule = join( '',
|
|
do_proto( $proto, $ports, $sports ),
|
|
do_ratelimit( $ratelimit, 'ACCEPT' ),
|
|
do_user $user,
|
|
do_test( $mark , $globals{TC_MASK} ),
|
|
do_condition( $condition )
|
|
);
|
|
$loglevel = '';
|
|
$dest = $server;
|
|
$action = 'ACCEPT';
|
|
$origdest = ALLIP if $origdest =~ /[+]/;
|
|
}
|
|
} elsif ( $actiontype & NONAT ) {
|
|
#
|
|
# NONAT or ACCEPT+ -- May not specify a destination interface
|
|
#
|
|
fatal_error "Invalid DEST ($dest) in $action rule" if $dest =~ /:/;
|
|
|
|
$origdest = '' unless $origdest and $origdest ne '-';
|
|
|
|
if ( $origdest eq 'detect' ) {
|
|
my $interfacesref = $sourceref->{interfaces};
|
|
my $interfaces = [ ( keys %$interfacesref ) ];
|
|
$origdest = $interfaces ? "detect:@$interfaces" : ALLIP;
|
|
}
|
|
|
|
my $tgt = 'RETURN';
|
|
|
|
my $nonat_chain;
|
|
|
|
my $chn;
|
|
|
|
if ( $inaction ) {
|
|
$nonat_chain = ensure_chain( 'nat', $chain );
|
|
} elsif ( $sourceref->{type} == FIREWALL ) {
|
|
$nonat_chain = $nat_table->{OUTPUT};
|
|
} else {
|
|
$nonat_chain = ensure_chain( 'nat', dnat_chain( $sourcezone ) );
|
|
|
|
my @interfaces = keys %{zone_interfaces $sourcezone};
|
|
|
|
for ( @interfaces ) {
|
|
my $ichain = input_chain $_;
|
|
|
|
if ( $nat_table->{$ichain} ) {
|
|
#
|
|
# Static NAT is defined on this interface
|
|
#
|
|
$chn = new_chain( 'nat', newnonatchain ) unless $chn;
|
|
add_ijump $chn, j => $nat_table->{$ichain}, @interfaces > 1 ? imatch_source_dev( $_ ) : ();
|
|
}
|
|
}
|
|
|
|
if ( $chn ) {
|
|
#
|
|
# Call expand_rule() to correctly handle logging. Because
|
|
# the 'logname' argument is passed, expand_rule() will
|
|
# not create a separate logging chain but will rather emit
|
|
# any logging rule in-line.
|
|
#
|
|
expand_rule( $chn,
|
|
PREROUTE_RESTRICT,
|
|
'', # Rule
|
|
'', # Source
|
|
'', # Dest
|
|
'', # Original dest
|
|
'ACCEPT',
|
|
$loglevel,
|
|
$log_action,
|
|
'',
|
|
dnat_chain( $sourcezone ) );
|
|
$loglevel = '';
|
|
$tgt = $chn->{name};
|
|
} else {
|
|
$tgt = 'ACCEPT';
|
|
}
|
|
}
|
|
|
|
dont_move( dont_optimize( $nonat_chain ) ) if $tgt eq 'RETURN';
|
|
|
|
expand_rule( $nonat_chain ,
|
|
PREROUTE_RESTRICT ,
|
|
$rule ,
|
|
$source ,
|
|
$dest ,
|
|
$origdest ,
|
|
$tgt,
|
|
$loglevel ,
|
|
$log_action ,
|
|
'',
|
|
);
|
|
}
|
|
|
|
#
|
|
# Add filter table rule, unless this is a NATONLY rule type
|
|
#
|
|
unless ( $actiontype & NATONLY ) {
|
|
|
|
if ( $actiontype & ACTION ) {
|
|
$action = $usedactions{$normalized_target}{name};
|
|
$loglevel = '';
|
|
} else {
|
|
dont_move( dont_optimize ( $chainref ) ) if $action eq 'RETURN';
|
|
}
|
|
|
|
if ( $origdest ) {
|
|
unless ( $origdest eq '-' ) {
|
|
require_capability( 'CONNTRACK_MATCH', 'ORIGINAL DEST in a non-NAT rule', 's' ) unless $actiontype & NATRULE;
|
|
} else {
|
|
$origdest = '';
|
|
}
|
|
}
|
|
|
|
$rule .= "-m conntrack --ctorigdstport $origdstports " if have_capability( 'NEW_CONNTRACK_MATCH' ) && $origdstports;
|
|
|
|
verify_audit( $action ) if $actiontype & AUDIT;
|
|
|
|
expand_rule( $chainref ,
|
|
$restriction ,
|
|
$rule ,
|
|
$source ,
|
|
$dest ,
|
|
$origdest ,
|
|
$action ,
|
|
$loglevel ,
|
|
$log_action ,
|
|
'' );
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
#
|
|
# Helper functions for process_rule(). That function deals with the ugliness of wildcard zones ('all' and 'any') and zone lists.
|
|
#
|
|
# Process a SECTION header
|
|
#
|
|
sub process_section ($) {
|
|
my $sect = shift;
|
|
#
|
|
# split_line1 has already verified that there are exactly two tokens on the line
|
|
#
|
|
fatal_error "Invalid SECTION ($sect)" unless defined $sections{$sect};
|
|
fatal_error "Duplicate or out of order SECTION $sect" if $sections{$sect};
|
|
$sections{$sect} = 1;
|
|
|
|
if ( $sect eq 'ALL' ) {
|
|
$sections{BLACKLIST} = 1;
|
|
} elsif ( $sect eq 'ESTABLISHED' ) {
|
|
$sections{'BLACKLIST','ALL'} = ( 1, 1);
|
|
} elsif ( $sect eq 'RELATED' ) {
|
|
@sections{'BLACKLIST','ALL','ESTABLISHED'} = ( 1, 1, 1);
|
|
finish_section 'ESTABLISHED';
|
|
} elsif ( $sect eq 'NEW' ) {
|
|
@sections{'BLACKLIST','ALL','ESTABLISHED','RELATED'} = ( 1, 1, 1, 1 );
|
|
finish_section ( ( $section eq 'RELATED' ) ? 'RELATED' : 'ESTABLISHED,RELATED' );
|
|
}
|
|
|
|
$section = $sect;
|
|
}
|
|
|
|
#
|
|
# Build a source or destination zone list
|
|
#
|
|
sub build_zone_list( $$$\$\$ ) {
|
|
my ($fw, $input, $which, $intrazoneref, $wildref ) = @_;
|
|
my $any = ( $input =~ s/^any/all/ );
|
|
my $exclude;
|
|
my $rest;
|
|
my %exclude;
|
|
my @result;
|
|
#
|
|
# Handle Wildcards
|
|
#
|
|
if ( $input =~ /^(all[-+]*)(![^:]+)?(:.*)?$/ ) {
|
|
$input = $1;
|
|
$exclude = $2;
|
|
$rest = $3;
|
|
|
|
$$wildref = 1;
|
|
|
|
if ( defined $exclude ) {
|
|
$exclude =~ s/!//;
|
|
fatal_error "Invalid exclusion list (!$exclude)" if $exclude =~ /^,|!|,,|,$/;
|
|
for ( split /,/, $exclude ) {
|
|
fatal_error "Unknown zone ($_)" unless defined_zone $_;
|
|
$exclude{$_} = 1;
|
|
}
|
|
}
|
|
|
|
unless ( $input eq 'all' ) {
|
|
if ( $input eq 'all+' ) {
|
|
$$intrazoneref = 1;
|
|
} elsif ( ( $input eq 'all+-' ) || ( $input eq 'all-+' ) ) {
|
|
$$intrazoneref = 1;
|
|
$exclude{$fw} = 1;
|
|
} elsif ( $input eq 'all-' ) {
|
|
$exclude{$fw} = 1;
|
|
} else {
|
|
fatal_error "Invalid $which ($input)";
|
|
}
|
|
}
|
|
|
|
@result = grep ! $exclude{$_}, $any ? all_parent_zones : non_firewall_zones;
|
|
|
|
unshift @result, $fw unless $exclude{$fw};
|
|
|
|
} elsif ( $input =~ /^([^:]+,[^:]+)(:.*)?$/ ) {
|
|
$input = $1;
|
|
$rest = $2;
|
|
$$wildref = 1;
|
|
|
|
$$intrazoneref = ( $input =~ s/\+$// );
|
|
|
|
@result = split_list $input, 'zone';
|
|
} else {
|
|
@result = ( $input );
|
|
}
|
|
|
|
if ( defined $rest ) {
|
|
$_ .= $rest for @result;
|
|
}
|
|
|
|
@result;
|
|
}
|
|
|
|
#
|
|
# Process a Record in the rules file
|
|
#
|
|
sub process_rule ( ) {
|
|
my ( $target, $source, $dest, $protos, $ports, $sports, $origdest, $ratelimit, $user, $mark, $connlimit, $time, $headers, $condition )
|
|
= split_line1 'rules file', \%rulecolumns, $rule_commands;
|
|
|
|
fatal_error 'ACTION must be specified' if $target eq '-';
|
|
|
|
process_comment, return 1 if $target eq 'COMMENT';
|
|
process_section( $source ), return 1 if $target eq 'SECTION';
|
|
#
|
|
# Section Names are optional so once we get to an actual rule, we need to be sure that
|
|
# we close off any missing sections.
|
|
#
|
|
process_section( 'NEW' ) unless $section;
|
|
|
|
if ( $source =~ /^none(:.*)?$/i || $dest =~ /^none(:.*)?$/i ) {
|
|
progress_message "Rule \"$currentline\" ignored.";
|
|
return 1;
|
|
}
|
|
|
|
my $intrazone = 0;
|
|
my $wild = 0;
|
|
my $thisline = $currentline; #We must save $currentline because it is overwritten by macro expansion
|
|
my $action = isolate_basic_target $target;
|
|
my $fw = firewall_zone;
|
|
my @source = build_zone_list ( $fw, $source, 'SOURCE', $intrazone, $wild );
|
|
my @dest = build_zone_list ( $fw, $dest, 'DEST' , $intrazone, $wild );
|
|
my @protos = split_list1 $protos, 'Protocol';
|
|
my $generated = 0;
|
|
|
|
fatal_error "Invalid or missing ACTION ($target)" unless defined $action;
|
|
|
|
if ( @protos > 1 ) {
|
|
fatal_error "Inversion not allowed in a PROTO list" if $protos =~ tr/!/!/;
|
|
}
|
|
|
|
for $source ( @source ) {
|
|
for $dest ( @dest ) {
|
|
my $sourcezone = (split( /:/, $source, 2 ) )[0];
|
|
my $destzone = (split( /:/, $dest, 2 ) )[0];
|
|
$destzone = $action =~ /^REDIRECT/ ? $fw : '' unless defined_zone $destzone;
|
|
if ( ! $wild || $intrazone || ( $sourcezone ne $destzone ) ) {
|
|
for my $proto ( @protos ) {
|
|
$generated |= process_rule1( undef,
|
|
$target,
|
|
'',
|
|
$source,
|
|
$dest,
|
|
$proto,
|
|
$ports,
|
|
$sports,
|
|
$origdest,
|
|
$ratelimit,
|
|
$user,
|
|
$mark,
|
|
$connlimit,
|
|
$time,
|
|
$headers,
|
|
$condition,
|
|
$wild );
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
warning_message qq(Entry generated no $toolname rules) unless $generated;
|
|
|
|
progress_message qq( Rule "$thisline" $done);
|
|
}
|
|
|
|
#
|
|
# Process the Rules File
|
|
#
|
|
sub process_rules() {
|
|
my $fn = open_file 'blrules';
|
|
|
|
if ( $fn ) {
|
|
first_entry( sub () {
|
|
my ( $level, $disposition ) = @config{'BLACKLIST_LOGLEVEL', 'BLACKLIST_DISPOSITION' };
|
|
my $audit = $disposition =~ /^A_/;
|
|
my $target = $disposition eq 'REJECT' ? 'reject' : $disposition;
|
|
|
|
progress_message2 "$doing $fn...";
|
|
|
|
if ( supplied $level ) {
|
|
ensure_blacklog_chain( $target, $disposition, $level, $audit );
|
|
} elsif ( $audit ) {
|
|
require_capability 'AUDIT_TARGET', "BLACKLIST_DISPOSITION=$disposition", 's';
|
|
verify_audit( $disposition );
|
|
}
|
|
} );
|
|
|
|
$section = 'BLACKLIST';
|
|
|
|
process_rule while read_a_line;
|
|
|
|
$section = '';
|
|
}
|
|
|
|
$fn = open_file 'rules';
|
|
|
|
if ( $fn ) {
|
|
|
|
first_entry "$doing $fn...";
|
|
|
|
process_rule while read_a_line;
|
|
|
|
clear_comment;
|
|
}
|
|
|
|
$section = 'DONE';
|
|
}
|
|
|
|
1;
|