my @elements = split(/,/, $str);
die "extraneous commas in list\n" if $str ne join(',', @elements);
foreach my $item (@elements) {
- if ($item =~ m/^(\d+):(\d+)$/) {
+ if ($item =~ m/^([0-9]+):([0-9]+)$/) {
$count += 2;
my ($port1, $port2) = ($1, $2);
die "invalid port '$port1'\n" if $port1 > 65535;
die "invalid port '$port2'\n" if $port2 > 65535;
- } elsif ($item =~ m/^(\d+)$/) {
+ die "backwards range '$port1:$port2' not allowed, did you mean '$port2:$port1'?\n" if $port1 > $port2;
+ } elsif ($item =~ m/^([0-9]+)$/) {
$count += 1;
my $port = $1;
die "invalid port '$port'\n" if $port > 65535;
minimum => 0,
optional => 1,
},
+ ebtables => {
+ description => "Enable ebtables rules cluster wide.",
+ type => 'boolean',
+ default => 1,
+ optional => 1,
+ },
policy_in => {
description => "Input policy.",
type => 'string',
type => 'boolean',
optional => 1,
},
+ nf_conntrack_allow_invalid => {
+ description => "Allow invalid packets on connection tracking.",
+ type => 'boolean',
+ default => 0,
+ optional => 1,
+ },
};
our $vm_option_properties = {
run_command("/sbin/ipset restore", input => $cmdlist, errmsg => "ipset_restore_cmdlist");
}
+sub ebtables_restore_cmdlist {
+ my ($cmdlist) = @_;
+
+ run_command("/sbin/ebtables-restore", input => $cmdlist, errmsg => "ebtables_restore_cmdlist");
+}
+
sub iptables_get_chains {
my ($iptablescmd) = @_;
return $res;
}
+sub ebtables_get_chains {
+
+ my $res = {};
+ my $chains = {};
+ my $parser = sub {
+ my $line = shift;
+ return if $line =~ m/^#/;
+ return if $line =~ m/^\s*$/;
+ if ($line =~ m/^:(\S+)\s\S+$/) {
+ # Make sure we know chains exist even if they're empty.
+ $chains->{$1} //= [];
+ } elsif ($line =~ m/^(?:\S+)\s(\S+)\s(?:\S+).*/) {
+ my $chain = $1;
+ $line =~ s/\s+$//;
+ push @{$chains->{$chain}}, $line;
+ } else {
+ # simply ignore the rest
+ return;
+ }
+ };
+
+ run_command("/sbin/ebtables-save", outfunc => $parser);
+ # compute digest for each chain and store rules as well
+ foreach my $chain (keys %$chains) {
+ $res->{$chain}->{rules} = $chains->{$chain};
+ $res->{$chain}->{sig} = iptables_chain_digest($chains->{$chain});
+ }
+ return $res;
+}
+
# substitude action of rule according to action hash
sub rule_substitude_action {
my ($rule, $actions) = @_;
my $logaction = get_log_rule_base($chain, $vmid, $logmsg, $log);
push @{$ruleset->{$chain}}, "-A $chain $match $logaction";
}
- push @{$ruleset->{$chain}}, "-A $chain $match $action";
+ # for stable ebtables digests avoid double-spaces to match ebtables-save output
+ $match .= ' ' if length($match);
+ push @{$ruleset->{$chain}}, "-A $chain ${match}$action";
}
sub ruleset_insertrule {
} elsif ($policy eq 'REJECT') {
ruleset_addrule($ruleset, $chain, "", "-j PVEFW-Reject");
- ruleset_addrule($ruleset, $chain, "", "-g PVEFW-reject", $loglevel, "policy $policy:", $vmid);
+ ruleset_addrule($ruleset, $chain, "", "-g PVEFW-reject", $loglevel, "policy $policy: ", $vmid);
} else {
# should not happen
die "internal error: unknown policy '$policy'";
}
sub ruleset_chain_add_conn_filters {
- my ($ruleset, $chain, $accept) = @_;
+ my ($ruleset, $chain, $allow_invalid, $accept) = @_;
- ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID", "-j DROP");
+ if (!$allow_invalid) {
+ ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate INVALID", "-j DROP");
+ }
ruleset_addrule($ruleset, $chain, "-m conntrack --ctstate RELATED,ESTABLISHED", "-j $accept");
}
if ($direction eq 'OUT') {
$policy = $options->{policy_out} || 'ACCEPT'; # allow everything by default
} else {
- $policy = $options->{policy_in} || 'DROP'; # allow nothing by default
+ $policy = $options->{policy_in} || 'DROP'; # allow nothing by default
}
my $accept = generate_nfqueue($options);
ruleset_addrule($ruleset, $chain, "-i lo", "-j ACCEPT");
- ruleset_chain_add_conn_filters($ruleset, $chain, 'ACCEPT');
+ ruleset_chain_add_conn_filters($ruleset, $chain, 0, 'ACCEPT');
ruleset_chain_add_ndp($ruleset, $chain, $ipversion, $options, 'IN', '-j RETURN');
ruleset_chain_add_input_filters($ruleset, $chain, $ipversion, $options, $cluster_conf, $loglevel);
ruleset_addrule($ruleset, $chain, "-o lo", "-j ACCEPT");
- ruleset_chain_add_conn_filters($ruleset, $chain, 'ACCEPT');
+ ruleset_chain_add_conn_filters($ruleset, $chain, 0, 'ACCEPT');
# we use RETURN because we may want to check other thigs later
$accept_action = 'RETURN';
return $rule;
}
+sub verify_ethertype {
+ my ($value) = @_;
+ my $types = get_etc_ethertypes();
+ die "unknown ethernet protocol type: $value\n"
+ if !defined($types->{byname}->{$value}) &&
+ !defined($types->{byid}->{$value});
+}
+
sub parse_vmfw_option {
my ($line) = @_;
} elsif ($line =~ m/^(ips_queues):\s*((\d+)(:(\d+))?)\s*$/i) {
$opt = lc($1);
$value = $2;
+ } elsif ($line =~ m/^(layer2_protocols):\s*(((\S+)[,]?)+)\s*$/i) {
+ $opt = lc($1);
+ $value = $2;
+ verify_ethertype($_) foreach split(/\s*,\s*/, $value);
} else {
die "can't parse option '$line'\n"
}
my $loglevels = "emerg|alert|crit|err|warning|notice|info|debug|nolog";
- if ($line =~ m/^(enable|nosmurfs|tcpflags|ndp):\s*(0|1)\s*$/i) {
+ if ($line =~ m/^(enable|nosmurfs|tcpflags|ndp|log_nf_conntrack|nf_conntrack_allow_invalid):\s*(0|1)\s*$/i) {
$opt = lc($1);
$value = int($2);
} elsif ($line =~ m/^(log_level_in|log_level_out|tcp_flags_log_level|smurf_log_level):\s*(($loglevels)\s*)?$/i) {
if (($value > 1) && ((time() - $value) > 60)) {
$value = 0
}
+ } elsif ($line =~ m/^(ebtables):\s*(0|1)\s*$/i) {
+ $opt = lc($1);
+ $value = int($2);
} elsif ($line =~ m/^(policy_(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
$opt = lc($1);
$value = uc($3);
$vmfw_configs = read_vm_firewall_configs($cluster_conf, $vmdata, undef, $verbose);
}
- return ({},{},{}) if !$cluster_conf->{options}->{enable};
+ return ({},{},{},{}) if !$cluster_conf->{options}->{enable};
my $localnet;
if ($cluster_conf->{aliases}->{local_network}) {
my $localnet_ver;
($localnet, $localnet_ver) = parse_ip_or_cidr(local_network() || '127.0.0.0/8');
- $cluster_conf->{aliases}->{local_network} = {
+ $cluster_conf->{aliases}->{local_network} = {
name => 'local_network', cidr => $localnet, ipversion => $localnet_ver };
}
my $ruleset = compile_iptables_filter($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, 4, $verbose);
my $rulesetv6 = compile_iptables_filter($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, 6, $verbose);
+ my $ebtables_ruleset = compile_ebtables_filter($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $verbose);
my $ipset_ruleset = compile_ipsets($cluster_conf, $vmfw_configs, $vmdata);
- return ($ruleset, $ipset_ruleset, $rulesetv6);
+ return ($ruleset, $ipset_ruleset, $rulesetv6, $ebtables_ruleset);
}
sub compile_iptables_filter {
# fixme: what log level should we use here?
my $loglevel = get_option_log_level($hostfw_options, "log_level_out");
- ruleset_chain_add_conn_filters($ruleset, "PVEFW-FORWARD", "ACCEPT");
+ my $conn_allow_invalid = $hostfw_options->{nf_conntrack_allow_invalid} // 0;
+ ruleset_chain_add_conn_filters($ruleset, "PVEFW-FORWARD", $conn_allow_invalid, "ACCEPT");
ruleset_create_chain($ruleset, "PVEFW-FWBR-IN");
ruleset_chain_add_input_filters($ruleset, "PVEFW-FWBR-IN", $ipversion, $hostfw_options, $cluster_conf, $loglevel);
return $ipset_ruleset;
}
+sub compile_ebtables_filter {
+ my ($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $verbose) = @_;
+
+ if (!($cluster_conf->{options}->{ebtables} // 1)) {
+ return {};
+ }
+
+ my $ruleset = {};
+
+ ruleset_create_chain($ruleset, "PVEFW-FORWARD");
+
+ ruleset_create_chain($ruleset, "PVEFW-FWBR-OUT");
+ #for ipv4 and ipv6, check macaddress in iptables, so we use conntrack 'ESTABLISHED', to speedup rules
+ ruleset_addrule($ruleset, 'PVEFW-FORWARD', '-p IPv4', '-j ACCEPT');
+ ruleset_addrule($ruleset, 'PVEFW-FORWARD', '-p IPv6', '-j ACCEPT');
+ ruleset_addrule($ruleset, 'PVEFW-FORWARD', '-o fwln+', '-j PVEFW-FWBR-OUT');
+
+ # generate firewall rules for QEMU VMs
+ foreach my $vmid (sort keys %{$vmdata->{qemu}}) {
+ eval {
+ my $conf = $vmdata->{qemu}->{$vmid};
+ my $vmfw_conf = $vmfw_configs->{$vmid};
+ return if !$vmfw_conf;
+ my $ipsets = $vmfw_conf->{ipset};
+
+ foreach my $netid (sort keys %$conf) {
+ next if $netid !~ m/^net(\d+)$/;
+ my $net = PVE::QemuServer::parse_net($conf->{$netid});
+ next if !$net->{firewall};
+ my $iface = "tap${vmid}i$1";
+ my $macaddr = $net->{macaddr};
+ my $arpfilter = [];
+ if (defined(my $ipset = $ipsets->{"ipfilter-$netid"})) {
+ foreach my $ipaddr (@$ipset) {
+ my($ip, $version) = parse_ip_or_cidr($ipaddr->{cidr});
+ next if !$ip || ($version && $version != 4);
+ push(@$arpfilter, $ip);
+ }
+ }
+ generate_tap_layer2filter($ruleset, $iface, $macaddr, $vmfw_conf, $vmid, $arpfilter);
+ }
+ };
+ warn $@ if $@; # just to be sure - should not happen
+ }
+
+ # generate firewall rules for LXC containers
+ foreach my $vmid (sort keys %{$vmdata->{lxc}}) {
+ eval {
+ my $conf = $vmdata->{lxc}->{$vmid};
+
+ my $vmfw_conf = $vmfw_configs->{$vmid};
+ return if !$vmfw_conf || !$vmfw_conf->{options}->{enable};
+ my $ipsets = $vmfw_conf->{ipset};
+
+ foreach my $netid (sort keys %$conf) {
+ next if $netid !~ m/^net(\d+)$/;
+ my $net = PVE::LXC::Config->parse_lxc_network($conf->{$netid});
+ next if !$net->{firewall};
+ my $iface = "veth${vmid}i$1";
+ my $macaddr = $net->{hwaddr};
+ my $arpfilter = [];
+ if (defined(my $ipset = $ipsets->{"ipfilter-$netid"})) {
+ foreach my $ipaddr (@$ipset) {
+ my($ip, $version) = parse_ip_or_cidr($ipaddr->{cidr});
+ next if !$ip || ($version && $version != 4);
+ push(@$arpfilter, $ip);
+ }
+ }
+ push(@$arpfilter, $net->{ip}) if $net->{ip} && $vmfw_conf->{options}->{ipfilter};
+ generate_tap_layer2filter($ruleset, $iface, $macaddr, $vmfw_conf, $vmid, $arpfilter);
+ }
+ };
+ warn $@ if $@; # just to be sure - should not happen
+ }
+
+ return $ruleset;
+}
+
+sub generate_tap_layer2filter {
+ my ($ruleset, $iface, $macaddr, $vmfw_conf, $vmid, $arpfilter) = @_;
+ my $options = $vmfw_conf->{options};
+
+ my $tapchain = $iface."-OUT";
+
+ # ebtables remove zeros from mac pairs
+ $macaddr =~ s/0([0-9a-f])/$1/ig;
+ $macaddr = lc($macaddr);
+
+ ruleset_create_chain($ruleset, $tapchain);
+
+ if (defined($macaddr) && !(defined($options->{macfilter}) && $options->{macfilter} == 0)) {
+ ruleset_addrule($ruleset, $tapchain, "-s ! $macaddr", '-j DROP');
+ }
+
+ if (@$arpfilter){
+ my $arpchain = $tapchain."-ARP";
+ ruleset_addrule($ruleset, $tapchain, "-p ARP", "-j $arpchain");
+ ruleset_create_chain($ruleset, $arpchain);
+
+ foreach my $ip (@{$arpfilter}) {
+ ruleset_addrule($ruleset, $arpchain, "-p ARP --arp-ip-src $ip", '-j RETURN');
+ }
+ ruleset_addrule($ruleset, $arpchain, '', '-j DROP');
+ }
+
+ if (defined($options->{layer2_protocols})){
+ my $protochain = $tapchain."-PROTO";
+ ruleset_addrule($ruleset, $tapchain, '', "-j $protochain");
+ ruleset_create_chain($ruleset, $protochain);
+
+ foreach my $proto (split(/,/, $options->{layer2_protocols})) {
+ ruleset_addrule($ruleset, $protochain, "-p $proto", '-j RETURN');
+ }
+ ruleset_addrule($ruleset, $protochain, '', '-j DROP');
+ }
+
+ ruleset_addrule($ruleset, $tapchain, '', '-j ACCEPT');
+
+ ruleset_addrule($ruleset, 'PVEFW-FWBR-OUT', "-i $iface", "-j $tapchain");
+}
+
+# the parameter $change_only_regex changes two things if defined:
+# * all chains not matching it will be left intact
+# * both the $active_chains hash and the returned status_hash have different
+# structure (they contain a key named 'rules').
sub get_ruleset_status {
- my ($ruleset, $active_chains, $digest_fn, $verbose) = @_;
+ my ($ruleset, $active_chains, $digest_fn, $verbose, $change_only_regex) = @_;
my $statushash = {};
foreach my $chain (sort keys %$ruleset) {
- my $sig = &$digest_fn($ruleset->{$chain});
+ my $rules = $ruleset->{$chain};
+ my $sig = &$digest_fn($rules);
+ my $oldsig;
$statushash->{$chain}->{sig} = $sig;
-
- my $oldsig = $active_chains->{$chain};
+ if (defined($change_only_regex)) {
+ $oldsig = $active_chains->{$chain}->{sig};
+ $statushash->{$chain}->{rules} = $rules;
+ } else {
+ $oldsig = $active_chains->{$chain};
+ }
if (!defined($oldsig)) {
$statushash->{$chain}->{action} = 'create';
} else {
$statushash->{$chain}->{action} = 'update';
}
}
- print "$statushash->{$chain}->{action} $chain ($sig)\n" if $verbose;
- foreach my $cmd (@{$ruleset->{$chain}}) {
- print "\t$cmd\n" if $verbose;
+ if ($verbose) {
+ print "$statushash->{$chain}->{action} $chain ($sig)\n";
+ foreach my $cmd (@{$rules}) {
+ print "\t$cmd\n";
+ }
}
}
foreach my $chain (sort keys %$active_chains) {
- if (!defined($ruleset->{$chain})) {
- my $sig = $active_chains->{$chain};
- $statushash->{$chain}->{action} = 'delete';
- $statushash->{$chain}->{sig} = $sig;
- print "delete $chain ($sig)\n" if $verbose;
+ next if defined($ruleset->{$chain});
+ my $action = 'delete';
+ my $sig = $active_chains->{$chain};
+ if (defined($change_only_regex)) {
+ $action = 'ignore' if ($chain !~ m/$change_only_regex/);
+ $statushash->{$chain}->{rules} = $active_chains->{$chain}->{rules};
+ $sig = $sig->{sig};
}
+ $statushash->{$chain}->{action} = $action;
+ $statushash->{$chain}->{sig} = $sig;
+ print "$action $chain ($sig)\n" if $verbose;
}
return $statushash;
return wantarray ? ($cmdlist, $changes) : $cmdlist;
}
+my $pve_ebtables_chainname_regex = qr/PVEFW-\S+|(?:tap|veth)\d+i\d+-(?:IN|OUT)/;
+
+sub get_ebtables_cmdlist {
+ my ($ruleset, $verbose) = @_;
+
+ my $changes = 0;
+ my $cmdlist = "*filter\n";
+
+ my $active_chains = ebtables_get_chains();
+ my $statushash = get_ruleset_status($ruleset, $active_chains,
+ \&iptables_chain_digest, $verbose,
+ $pve_ebtables_chainname_regex);
+
+ # create chains first and make sure PVE rules are evaluated if active
+ my $append_pve_to_forward = '-A FORWARD -j PVEFW-FORWARD';
+ my $pve_include = 0;
+ foreach my $chain (sort keys %$statushash) {
+ next if ($statushash->{$chain}->{action} eq 'delete');
+ $cmdlist .= ":$chain ACCEPT\n";
+ $pve_include = 1 if ($chain eq 'PVEFW-FORWARD');
+ }
+
+ foreach my $chain (sort keys %$statushash) {
+ my $stat = $statushash->{$chain};
+ next if ($stat->{action} eq 'delete');
+ $changes = 1 if ($stat->{action} !~ 'ignore|exists');
+
+ foreach my $cmd (@{$statushash->{$chain}->{'rules'}}) {
+ if ($chain eq 'FORWARD' && $cmd eq $append_pve_to_forward) {
+ next if ! $pve_include;
+ $pve_include = 0;
+ }
+ $cmdlist .= "$cmd\n";
+ }
+ }
+ $cmdlist .= "$append_pve_to_forward\n" if $pve_include;
+
+ return wantarray ? ($cmdlist, $changes) : $cmdlist;
+}
+
sub get_ipset_cmdlist {
my ($ruleset, $verbose) = @_;
}
sub apply_ruleset {
- my ($ruleset, $hostfw_conf, $ipset_ruleset, $rulesetv6, $verbose) = @_;
+ my ($ruleset, $hostfw_conf, $ipset_ruleset, $rulesetv6, $ebtables_ruleset, $verbose) = @_;
enable_bridge_firewall();
my ($cmdlist, $changes) = get_ruleset_cmdlist($ruleset, $verbose);
my ($cmdlistv6, $changesv6) = get_ruleset_cmdlist($rulesetv6, $verbose, "ip6tables");
+ my ($ebtables_cmdlist, $ebtables_changes) = get_ebtables_cmdlist($ebtables_ruleset, $verbose);
if ($verbose) {
if ($ipset_changes) {
print "ip6tables changes:\n";
print $cmdlistv6;
}
+
+ if ($ebtables_changes) {
+ print "ebtables changes:\n";
+ print $ebtables_cmdlist;
+ }
}
my $tmpfile = "$pve_fw_status_dir/ipsetcmdlist1";
ipset_restore_cmdlist($ipset_delete_cmdlist) if $ipset_delete_cmdlist;
+ ebtables_restore_cmdlist($ebtables_cmdlist);
+
+ $tmpfile = "$pve_fw_status_dir/ebtablescmdlist";
+ PVE::Tools::file_set_contents($tmpfile, $ebtables_cmdlist || '');
+
# test: re-read status and check if everything is up to date
my $active_chains = iptables_get_chains();
my $statushash = get_ruleset_status($ruleset, $active_chains, \&iptables_chain_digest, 0);
}
}
+ my $active_ebtables_chains = ebtables_get_chains();
+ my $ebtables_statushash = get_ruleset_status($ebtables_ruleset,
+ $active_ebtables_chains, \&iptables_chain_digest,
+ 0, $pve_ebtables_chainname_regex);
+
+ foreach my $chain (sort keys %$ebtables_ruleset) {
+ my $stat = $ebtables_statushash->{$chain};
+ if ($stat->{action} ne 'exists') {
+ warn "ebtables : unable to update chain '$chain'\n";
+ $errors = 1;
+ }
+ }
+
die "unable to apply firewall changes\n" if $errors;
update_nf_conntrack_max($hostfw_conf);
update_nf_conntrack_tcp_timeout_established($hostfw_conf);
+ update_nf_conntrack_logging($hostfw_conf);
}
sub update_nf_conntrack_max {
PVE::ProcFSTools::write_proc_entry("/proc/sys/net/netfilter/nf_conntrack_tcp_timeout_established", $value);
}
+my $log_nf_conntrack_enabled = undef;
+sub update_nf_conntrack_logging {
+ my ($hostfw_conf) = @_;
+
+ my $options = $hostfw_conf->{options} || {};
+ my $value = $options->{log_nf_conntrack} || 0;
+ if (!defined($log_nf_conntrack_enabled)
+ || $value != $log_nf_conntrack_enabled)
+ {
+ my $tmpfile = "$pve_fw_status_dir/log_nf_conntrack";
+ PVE::Tools::file_set_contents($tmpfile, $value);
+
+ PVE::Tools::run_command([qw(systemctl try-reload-or-restart pvefw-logger.service)]);
+ $log_nf_conntrack_enabled = $value;
+ }
+}
+
sub remove_pvefw_chains {
PVE::Firewall::remove_pvefw_chains_iptables("iptables");
my $hostfw_conf = load_hostfw_conf($cluster_conf);
- my ($ruleset, $ipset_ruleset, $rulesetv6) = compile($cluster_conf, $hostfw_conf);
+ my ($ruleset, $ipset_ruleset, $rulesetv6, $ebtables_ruleset) = compile($cluster_conf, $hostfw_conf);
- apply_ruleset($ruleset, $hostfw_conf, $ipset_ruleset, $rulesetv6);
+ apply_ruleset($ruleset, $hostfw_conf, $ipset_ruleset, $rulesetv6, $ebtables_ruleset);
};
run_locked($code);
projects / pve-firewall.git / blobdiff