diff options
Diffstat (limited to 'pkg/linux/bitmask-root')
| -rwxr-xr-x | pkg/linux/bitmask-root | 54 |
1 files changed, 27 insertions, 27 deletions
diff --git a/pkg/linux/bitmask-root b/pkg/linux/bitmask-root index 83e85774..9bd5dfce 100755 --- a/pkg/linux/bitmask-root +++ b/pkg/linux/bitmask-root @@ -729,63 +729,63 @@ def firewall_start(args): local_network_ipv6 = get_local_network_ipv6(default_device) gateways = get_gateways(args) - # add custom chain "bitmask" + # add custom chain "bitmask" to front of OUTPUT chain if not ipv4_chain_exists(BITMASK_CHAIN): ip4tables("--new-chain", BITMASK_CHAIN) if not ipv6_chain_exists(BITMASK_CHAIN): ip6tables("--new-chain", BITMASK_CHAIN) iptables("--insert", "OUTPUT", "--jump", BITMASK_CHAIN) - # reject everything - iptables("--insert", BITMASK_CHAIN, "-o", default_device, - "--jump", "REJECT") - - # log rejected packets to syslog - if DEBUG: - iptables("--insert", BITMASK_CHAIN, "-o", default_device, - "--jump", "LOG", "--log-prefix", "iptables denied: ", "--log-level", "7") + # allow DNS over VPN + for allowed_dns in [NAMESERVER, "127.0.0.1", "127.0.1.1"]: + ip4tables("--append", BITMASK_CHAIN, "--protocol", "udp", + "--dport", "53", "--destination", allowed_dns, + "--jump", "ACCEPT") - # allow traffic to gateways - for gateway in gateways: - ip4tables("--insert", BITMASK_CHAIN, "--destination", gateway, - "-o", default_device, "--jump", "ACCEPT") + # block DNS requests to anyone but the service provider or localhost + # (when we actually route ipv6, we will need DNS rules for it too) + ip4tables("--append", BITMASK_CHAIN, "--protocol", "udp", "--dport", "53", + "--jump", "REJECT") # allow traffic to IPs on local network if local_network_ipv4: - ip4tables("--insert", BITMASK_CHAIN, + ip4tables("--append", BITMASK_CHAIN, "--destination", local_network_ipv4, "-o", default_device, "--jump", "ACCEPT") # allow multicast Simple Service Discovery Protocol - ip4tables("--insert", BITMASK_CHAIN, + ip4tables("--append", BITMASK_CHAIN, "--protocol", "udp", "--destination", "239.255.255.250", "--dport", "1900", "-o", default_device, "--jump", "RETURN") # allow multicast Bonjour/mDNS - ip4tables("--insert", BITMASK_CHAIN, + ip4tables("--append", BITMASK_CHAIN, "--protocol", "udp", "--destination", "224.0.0.251", "--dport", "5353", "-o", default_device, "--jump", "RETURN") if local_network_ipv6: - ip6tables("--insert", BITMASK_CHAIN, + ip6tables("--append", BITMASK_CHAIN, "--destination", local_network_ipv6, "-o", default_device, "--jump", "ACCEPT") # allow multicast Simple Service Discovery Protocol - ip6tables("--insert", BITMASK_CHAIN, + ip6tables("--append", BITMASK_CHAIN, "--protocol", "udp", "--destination", "FF05::C", "--dport", "1900", "-o", default_device, "--jump", "RETURN") # allow multicast Bonjour/mDNS - ip6tables("--insert", BITMASK_CHAIN, + ip6tables("--append", BITMASK_CHAIN, "--protocol", "udp", "--destination", "FF02::FB", "--dport", "5353", "-o", default_device, "--jump", "RETURN") + # allow traffic to gateways + for gateway in gateways: + ip4tables("--append", BITMASK_CHAIN, "--destination", gateway, + "-o", default_device, "--jump", "ACCEPT") - # block DNS requests to anyone but the service provider or localhost - # when we actually route ipv6, we will need dns rules for it too - ip4tables("--insert", BITMASK_CHAIN, "--protocol", "udp", "--dport", "53", - "--jump", "REJECT") + # log rejected packets to syslog + if DEBUG: + iptables("--append", BITMASK_CHAIN, "-o", default_device, + "--jump", "LOG", "--log-prefix", "iptables denied: ", "--log-level", "7") - for allowed_dns in [NAMESERVER, "127.0.0.1", "127.0.1.1"]: - ip4tables("--insert", BITMASK_CHAIN, "--protocol", "udp", - "--dport", "53", "--destination", allowed_dns, - "--jump", "ACCEPT") + # reject everything else + iptables("--append", BITMASK_CHAIN, "-o", default_device, + "--jump", "REJECT") # workaround for ipv6 servers being blocked and not falling back to ipv4. # See #5693 |