[pve-devel] [PATCH 1/2] compile ebtables rules
Stefan Priebe
s.priebe at profihost.ag
Tue Jul 15 19:48:19 CEST 2014
this one has the old mac patch included. Please use V3.
Am 15.07.2014 19:45, schrieb Alexandre Derumier:
> -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 | 102 ++++++++++++++++++++++++++++++++++++++++++++++++-
> src/pve-firewall | 4 +-
> 3 files changed, 105 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 abf122b..48d9b8c 100644
> --- a/src/PVE/Firewall.pm
> +++ b/src/PVE/Firewall.pm
> @@ -2245,6 +2245,9 @@ 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 = $2;
> @@ -3000,8 +3003,9 @@ sub compile {
>
> my ($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, $ebtables_ruleset);
> }
>
> sub compile_iptables_filter {
> @@ -3150,6 +3154,100 @@ sub compile_iptables_filter {
> return ($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};
> +
> + # ebtables remove preceeding zero so we need todo it too (but only the first)
> + $macaddr =~ s/^0//;
> +
> + generate_tap_layer2filter($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};
> +
> + # ebtables remove preceeding zero so we need todo it too (but only the first)
> + $macaddr =~ s/^0//;
> +
> + generate_tap_layer2filter($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";
> + $macaddr = lc($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) = @_;
>
> @@ -3475,7 +3573,7 @@ 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);
>
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