[pve-devel] [PATCH 18/19] compile ebtables rules
Alexandre Derumier
aderumier at odiso.com
Wed Jul 16 01:14:34 CEST 2014
-A FORWARD -j PVEFW-FORWARD
-A PVEFW-FORWARD -p IPv4 -j ACCEPT #filter mac in iptables for ipv4, so we can speedup rules with conntrack established
-A PVEFW-FORWARD -p IPv6 -j ACCEPT
-A PVEFW-FORWARD -o fwln+ -j PVEFW-FWBR-OUT
-A PVEFW-FWBR-OUT -i tap110i0 -j tap110i0-OUT
-A tap110i0-OUT -s ! 36:97:15:91:19:3c -j DROP
-A tap110i0-OUT -p ARP -j ACCEPT
-A tap110i0-OUT -j DROP
-A tap110i0-OUT -j ACCEPT
-A PVEFW-FWBR-OUT -i veth130.1 -j veth130.1-OUT
-A veth130.1-OUT -s ! 36:95:a9:ae:f5:ec -j DROP
-A veth130.1-OUT -j ACCEPT
Signed-off-by: Alexandre Derumier <aderumier at odiso.com>
---
debian/example/100.fw | 3 ++
src/PVE/Firewall.pm | 99 ++++++++++++++++++++++++++++++++++++++++++++++++-
src/pve-firewall | 4 +-
3 files changed, 102 insertions(+), 4 deletions(-)
diff --git a/debian/example/100.fw b/debian/example/100.fw
index 7a8da48..0388dde 100644
--- a/debian/example/100.fw
+++ b/debian/example/100.fw
@@ -9,6 +9,9 @@ enable: 1
# disable/enable MAC address filter
macfilter: 0
+# allow only layer2 specific protocols
+layer2filter_protocols: ARP,802_1Q,IPX,NetBEUI,PPP
+
# default policy
policy_in: DROP
policy_out: REJECT
diff --git a/src/PVE/Firewall.pm b/src/PVE/Firewall.pm
index 06a02ee..47c6965 100644
--- a/src/PVE/Firewall.pm
+++ b/src/PVE/Firewall.pm
@@ -2244,6 +2244,9 @@ sub parse_vmfw_option {
} elsif ($line =~ m/^(policy_(in|out)):\s*(ACCEPT|DROP|REJECT)\s*$/i) {
$opt = lc($1);
$value = uc($3);
+ } elsif ($line =~ m/^(layer2filter_protocols):\s*(((ARP|802_1Q|IPX|NetBEUI|PPP)[,]?)+)\s*$/i) {
+ $opt = lc($1);
+ $value = $2;
} elsif ($line =~ m/^(ips_queues):\s*((\d+)(:(\d+))?)\s*$/i) {
$opt = lc($1);
$value = $2;
@@ -2999,8 +3002,9 @@ sub compile {
my ($ruleset, $ipset_ruleset) = compile_iptables_filter($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, $verbose);
- return ($ruleset, $ipset_ruleset, $rulesetv6);
+ return ($ruleset, $ipset_ruleset, $rulesetv6, $ebtables_ruleset);
}
sub compile_iptables_filter {
@@ -3149,6 +3153,97 @@ sub compile_iptables_filter {
return ($ruleset, $ipset_ruleset);
}
+sub compile_ebtables_filter {
+ my ($cluster_conf, $hostfw_conf, $vmfw_configs, $vmdata, $verbose) = @_;
+
+ return ({}, {}) if !$cluster_conf->{options}->{enable};
+
+ 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 $vmid (keys %{$vmdata->{qemu}}) {
+ eval {
+ my $conf = $vmdata->{qemu}->{$vmid};
+ my $vmfw_conf = $vmfw_configs->{$vmid};
+ return if !$vmfw_conf;
+
+ foreach my $netid (keys %$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 = $net->{macaddr};
+
+ generate_tap_layer2filter($ruleset, $iface, $macaddr, $vmfw_conf, $vmid);
+
+ }
+ };
+ warn $@ if $@; # just to be sure - should not happen
+ }
+
+ # generate firewall rules for OpenVZ containers
+ foreach my $vmid (keys %{$vmdata->{openvz}}) {
+ eval {
+ my $conf = $vmdata->{openvz}->{$vmid};
+
+ my $vmfw_conf = $vmfw_configs->{$vmid};
+ return if !$vmfw_conf;
+
+ if ($conf->{netif} && $conf->{netif}->{value}) {
+ my $netif = PVE::OpenVZ::parse_netif($conf->{netif}->{value});
+ foreach my $netid (keys %$netif) {
+ my $d = $netif->{$netid};
+ my $bridge = $d->{bridge};
+ next if !$bridge || $bridge !~ m/^vmbr\d+(v(\d+))?f$/; # firewall enabled ?
+ my $macaddr = $d->{mac};
+ my $iface = $d->{host_ifname};
+
+ generate_tap_layer2filter($ruleset, $iface, $macaddr, $vmfw_conf, $vmid);
+ }
+ }
+ };
+ warn $@ if $@; # just to be sure - should not happen
+ }
+
+ return $ruleset;
+}
+
+sub generate_tap_layer2filter {
+ my ($ruleset, $iface, $macaddr, $vmfw_conf, $vmid) = @_;
+ 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 ! $macaddr -j DROP");
+ }
+
+ if (defined($options->{layer2filter_protocols})){
+ foreach my $proto (split(/,/, $options->{layer2filter_protocols})) {
+ ruleset_addrule($ruleset, $tapchain, "-p $proto -j ACCEPT");
+ }
+ ruleset_addrule($ruleset, $tapchain, "-j DROP");
+ }
+
+ ruleset_addrule($ruleset, $tapchain, "-j ACCEPT");
+ ruleset_addrule($ruleset, "PVEFW-FWBR-OUT","-i $iface -j $tapchain");
+}
+
sub get_ruleset_status {
my ($ruleset, $active_chains, $digest_fn, $verbose) = @_;
@@ -3498,7 +3593,7 @@ sub update {
my $hostfw_conf = load_hostfw_conf();
- my ($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, $rulesetv6);
};
diff --git a/src/pve-firewall b/src/pve-firewall
index 6e5eb16..8e4c68d 100755
--- a/src/pve-firewall
+++ b/src/pve-firewall
@@ -344,7 +344,7 @@ __PACKAGE__->register_method ({
if ($status eq 'running') {
- my ($ruleset, $ipset_ruleset, $rulesetv6) = PVE::Firewall::compile($cluster_conf, undef, undef, $verbose);
+ my ($ruleset, $ipset_ruleset, $rulesetv6, $ebtables_ruleset) = PVE::Firewall::compile($cluster_conf, undef, undef, $verbose);
$verbose = 0; # do not show iptables details
my (undef, undef, $ipset_changes) = PVE::Firewall::get_ipset_cmdlist($ipset_ruleset, $verbose);
@@ -381,7 +381,7 @@ __PACKAGE__->register_method ({
my $verbose = 1;
my $cluster_conf = PVE::Firewall::load_clusterfw_conf(undef, $verbose);
- my ($ruleset, $ipset_ruleset, $rulesetv6) = PVE::Firewall::compile($cluster_conf, undef, undef, $verbose);
+ my ($ruleset, $ipset_ruleset, $rulesetv6, $ebtables_ruleset) = PVE::Firewall::compile($cluster_conf, undef, undef, $verbose);
my (undef, undef, $ipset_changes) = PVE::Firewall::get_ipset_cmdlist($ipset_ruleset, $verbose);
my (undef, $ruleset_changes) = PVE::Firewall::get_ruleset_cmdlist($ruleset, $verbose);
--
1.7.10.4
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