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|
#!/usr/bin/perl
#
# Module: vyatta-ipset.pl
#
# **** License ****
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
# General Public License for more details.
#
# This code was originally developed by Vyatta, Inc.
# Portions created by Vyatta are Copyright (C) 2009-2010 Vyatta, Inc.
# All Rights Reserved.
#
# Author: Stig Thormodsrud
# Date: January 2009
# Description: Script to configure ipset to support firewall groups
#
# **** End License ****
#
use Getopt::Long;
use POSIX;
use lib "/opt/vyatta/share/perl5";
use Vyatta::Config;
use Vyatta::TypeChecker;
use Vyatta::Misc;
use Vyatta::IpTables::IpSet;
use Sort::Versions;
use IO::Prompt;
use warnings;
use strict;
sub get_sys_sets {
my @sets = ();
my @lines = `ipset -L`;
foreach my $line (@lines) {
if ($line =~ /^Name:\s+(\w+)$/) {
push @sets, $1;
}
}
return @sets;
}
sub warn_before_reset {
if (prompt("This can be temporarily disruptive: Proceed with reset? (Yes/No) [No] ", -ynd=>"n")) {
return 1;
} else {
return 0;
}
}
sub ipset_reset {
my ($set_name, $set_type) = @_;
if (!warn_before_reset()) {
die "Cancelling reset\n";
}
my $group = new Vyatta::IpTables::IpSet($set_name, $set_type);
return $group->reset_ipset();
}
sub ipset_create {
my ($set_name, $set_type, $set_family) = @_;
my $group = new Vyatta::IpTables::IpSet($set_name, $set_type, $set_family);
return $group->create();
}
sub ipset_delete {
my $set_name = shift;
my $group = new Vyatta::IpTables::IpSet($set_name);
return $group->delete();
}
sub ipset_check_member {
my ($set_name, $set_type, $member) = @_;
die "undefined type or member" if ! defined $set_type or ! defined $member;
my $group = new Vyatta::IpTables::IpSet($set_name, $set_type);
return $group->check_member($member);
}
sub ipset_add_member {
my ($set_name, $member, $alias, $set_type) = @_;
my $hyphenated_port = 'false';
if (($set_type eq 'port') and ($member =~ /^\D\w+-\w*/)){
$member = "\[$member]";
$hyphenated_port = 'true';
}
die "Error: undefined member" if ! defined $member;
my $group = new Vyatta::IpTables::IpSet($set_name);
return $group->add_member($member, $alias, $hyphenated_port);
}
sub ipset_delete_member {
my ($set_name, $member, $set_type) = @_;
my $hyphenated_port = 'false';
if (($set_type eq 'port') and ($member =~ /^\D\w+-\w*/)){
$member = "\[$member]";
$hyphenated_port = 'true';
}
die "Error: undefined member" if ! defined $member;
my $group = new Vyatta::IpTables::IpSet($set_name);
return $group->delete_member($member, $hyphenated_port);
}
sub ipset_check_set_type {
my ($set_name, $set_type) = @_;
die "Error: undefined set_name\n" if ! defined $set_name;
die "Error: undefined set_type\n" if ! defined $set_type;
my $group = new Vyatta::IpTables::IpSet($set_name);
return "Group [$set_name] has not been defined\n" if ! $group->exists();
my $type = $group->get_type();
$type = 'undefined' if ! defined $type;
if ($type ne $set_type) {
return "Error: group [$set_name] is of type [$type] not [$set_type]\n";
}
return;
}
sub ipset_show_members {
my ($set_name) = @_;
die "Error: undefined set_name\n" if ! defined $set_name;
my $group = new Vyatta::IpTables::IpSet($set_name);
return "Group [$set_name] has not been defined\n" if ! $group->exists();
my $type = $group->get_type();
my @members = $group->get_members();
my $desc = $group->get_description();
my @fw_refs = $group->get_firewall_references();
push @fw_refs, 'none' if scalar(@fw_refs) == 0;
my $padding = ' ' x 13;
print "Name : $set_name\n";
print "Type : $type\n";
print "Description: $desc\n" if defined $desc;
print "References : ", join(', ', @fw_refs), "\n";
print "Members :\n";
print $padding, join($padding, @members);
return;
}
sub ipset_is_set_empty {
my ($set_name) = @_;
die "Error: undefined set_name\n" if ! defined $set_name;
my $group = new Vyatta::IpTables::IpSet($set_name);
return "Group [$set_name] has not been defined\n" if ! $group->exists();
my @members = $group->get_members();
exit 0 if scalar(@members) > 0;
exit 1;
}
sub ipset_show_sets {
my @lines = `ipset -L`;
my @sets = ();
foreach my $line (@lines) {
if ($line =~ /^Name:\s+(\S+)$/ ) {
push @sets, $1;
}
}
foreach my $set (sort { versioncmp($b, $a) } (@sets)) {
ipset_show_members($set);
print "\n";
}
return;
}
sub ipset_copy_set {
my ($set_name, $set_type, $set_copy) = @_;
die "Error: undefined set_name\n" if ! defined $set_name;
die "Error: undefined set_type\n" if ! defined $set_type;
die "Error: undefined set_copy\n" if ! defined $set_copy;
my $group = new Vyatta::IpTables::IpSet($set_name);
my $copy = new Vyatta::IpTables::IpSet($set_copy, $set_type);
if ($copy->exists()) {
return "Error: copy already exists [$set_copy]\n";
}
if ($group->exists()) {
my $type = $group->get_type();
if ($type ne $set_type) {
return "Error: type mismatch [$type] [$set_type]\n";
}
# copy members to new group
my $tmpfile = "/tmp/set.$$";
system("ipset -S $set_name > $tmpfile");
system("sed -i \'s/ $set_name / $set_copy /g\' $tmpfile");
system("ipset -R < $tmpfile");
unlink $tmpfile;
my $copy = new Vyatta::IpTables::IpSet($set_copy, $set_type);
return if $copy->exists();
return "Error: problem copying group\n";
} else {
my $rc = $group->create();
return $rc;
}
}
sub ipset_is_group_deleted {
my ($set_name, $set_type) = @_;
die "Error: undefined set_name\n" if ! defined $set_name;
die "Error: undefined set_type\n" if ! defined $set_type;
my $config = new Vyatta::Config;
$config->setLevel("firewall group $set_type-group");
my %nodes = $config->listNodeStatus();
if ($nodes{$set_name} eq 'deleted') {
exit 0;
} else {
exit 1;
}
}
sub ipset_is_group_used {
my ($set_name, $set_type) = @_;
die "Error: undefined set_name\n" if ! defined $set_name;
die "Error: undefined set_type\n" if ! defined $set_type;
my $group = new Vyatta::IpTables::IpSet($set_name);
my $refs = $group->references();
exit 0 if $refs > 0;
exit 1;
}
sub ipset_is_group_defined {
my ($set_name, $set_type, $set_family) = @_;
my $cfg = new Vyatta::Config;
die "Error: undefined set_name\n" if ! defined $set_name;
die "Error: undefined set_type\n" if ! defined $set_type;
die "Error: undefined set_family\n" if ! defined $set_family;
my $gpath = ($set_family eq 'inet') ? "firewall ipv6-group $set_type-group" : "firewall group $set_type-group";
my @groups = $cfg->listOrigNodes($gpath);
my $group;
foreach $group (@groups) {
if ($set_name eq $group) {
exit 1;
}
}
exit 0;
}
sub update_set {
my ($set_name, $set_type, $set_family) = @_;
my $cfg = new Vyatta::Config;
my ($rc, $newset);
my $cpath = ($set_family eq 'inet') ? "firewall group $set_type-group $set_name" : "firewall ipv6-group $set_type-group $set_name";
if ($cfg->existsOrig($cpath)) {
if (!$cfg->exists($cpath)) {
# deleted
return $rc if (($rc = ipset_delete($set_name)));
return;
}
} else {
if ($cfg->exists($cpath)) {
# added
return $rc if (($rc = ipset_create($set_name, $set_type, $set_family)));
$newset = 1;
} else {
# doesn't exist! should not happen
return "Updating non-existent group [$set_name]";
}
}
# added or potentially changed => iterate members
# to ensure that vyatta config and ipset stay in-sync, do the following:
# 1. copy orig set to tmp set
my $tmpset = "$set_name-$$";
if (($rc = ipset_copy_set($set_name, $set_type, $tmpset))) {
# copy failed
if ($newset) {
# destroy newly-created set since we're failing
system('ipset', '--destroy', $set_name);
}
return $rc;
}
# 2. add/delete members to/from tmp set according to changes
my @ovals = $cfg->returnOrigValues("$cpath $set_type");
my @nvals = $cfg->returnValues("$cpath $set_type");
my %vals = $cfg->compareValueLists(\@ovals, \@nvals);
while (1) {
for my $d (@{$vals{deleted}}) {
last if (($rc = ipset_delete_member($tmpset, $d, $set_type)));
}
last if ($rc);
for my $a (@{$vals{added}}) {
last if (($rc = ipset_add_member($tmpset, $a, $set_name, $set_type)));
}
last;
}
# 3. "commit" changes and/or clean up
if (!$rc) {
# no error
system('ipset', '--swap', $tmpset, $set_name);
} elsif ($newset) {
# destroy newly-created set since we're failing
system('ipset', '--destroy', $set_name);
}
system('ipset', '--destroy', $tmpset);
return $rc;
}
sub prune_deleted_sets {
my $cfg = new Vyatta::Config;
my @set_types = keys(%Vyatta::IpTables::IpSet::grouptype_hash);
foreach my $set_type (@set_types) {
$cfg->setLevel("firewall group $set_type-group");
my %groups = $cfg->listNodeStatus();
next if (scalar(keys(%groups)) < 1);
foreach my $g (keys(%groups)) {
next if ($groups{$g} ne 'deleted');
next if ($cfg->isEffective($g)); # don't prune if delete failed
my $rc;
# Try and delete, don't return error on failure. This subroutine is called when
# firewall root node is being removed to prune ipsets that might have not been
# deleted due to refcounts.
$rc = ipset_delete($g);
}
}
# fixup system sets
my @sys_sets = get_sys_sets();
foreach my $set (@sys_sets) {
my $group = new Vyatta::IpTables::IpSet($set);
# only try groups with no references
if ($group->exists() && ($group->references() == 0)) {
my $type = $group->get_type();
$cfg->setLevel("firewall group $type-group");
next if ($cfg->isEffective($set)); # don't prune if still in config
my $rc;
$rc = ipset_delete($set);
}
}
exit 0;
}
sub show_network_groups {
my $config = new Vyatta::Config;
my @port_groups = $config->listOrigNodes("firewall group network-group");
my $group;
foreach $group (@port_groups) {
print "$group\n";
}
}
sub show_address_groups {
my $config = new Vyatta::Config;
my @port_groups = $config->listOrigNodes("firewall group address-group");
my $group;
foreach $group (@port_groups) {
print "$group\n";
}
}
sub show_port_groups {
my $config = new Vyatta::Config;
my @port_groups = $config->listOrigNodes("firewall group port-group");
my $group;
foreach $group (@port_groups) {
print "$group\n";
}
}
#
# main
#
my ($action, $set_name, $set_type, $set_family, $member, $set_copy, $alias);
GetOptions("action=s" => \$action,
"set-name=s" => \$set_name,
"set-type=s" => \$set_type,
"set-family=s" => \$set_family,
"member=s" => \$member,
"alias=s" => \$alias,
"set-copy=s" => \$set_copy,
);
die "undefined action" if ! defined $action;
my $rc;
show_port_groups() if $action eq 'show-port-groups';
show_address_groups() if $action eq 'show-address-groups';
show_network_groups() if $action eq 'show-network-groups';
$rc = ipset_reset($set_name, $set_type) if $action eq 'reset-set';
$rc = ipset_create($set_name, $set_type, $set_family) if $action eq 'create-set';
$rc = ipset_delete($set_name) if $action eq 'delete-set';
$rc = ipset_check_member($set_name, $set_type, $member)
if $action eq 'check-member';
$rc = ipset_add_member($set_name, $member, $alias, $set_type) if $action eq 'add-member';
$rc = ipset_delete_member($set_name, $member) if $action eq 'delete-member';
$rc = ipset_check_set_type($set_name, $set_type) if $action eq 'check-set-type';
$rc = ipset_show_members($set_name) if $action eq 'show-set-members';
$rc = ipset_show_sets() if $action eq 'show-sets';
$rc = ipset_is_set_empty($set_name) if $action eq 'is-set-empty';
$rc = ipset_copy_set($set_name, $set_type, $set_copy) if $action eq 'copy-set';
$rc = ipset_is_group_deleted($set_name, $set_type)
if $action eq 'is-group-deleted';
$rc = ipset_is_group_used($set_name, $set_type) if $action eq 'is-group-used';
$rc = ipset_is_group_defined($set_name, $set_type, $set_family) if $action eq 'is-group-defined';
$rc = update_set($set_name, $set_type, $set_family) if $action eq 'update-set';
$rc = prune_deleted_sets() if $action eq 'prune-deleted-sets';
if (defined $rc) {
print $rc;
exit 1;
}
exit 0;
# end of file
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