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|
use rsdsl_netfilterd::error::Result;
use rustables::{
Batch, Chain, ChainPolicy, ChainType, Hook, HookClass, MsgType, Protocol, ProtocolFamily, Rule,
Table,
};
fn nat() -> Result<()> {
let mut batch = Batch::new();
let nat = Table::new(ProtocolFamily::Ipv4).with_name("nat");
batch.add(&nat, MsgType::Add);
// +-------------------+
// | POSTROUTING chain |
// +-------------------+
let mut postrouting = Chain::new(&nat).with_name("POSTROUTING");
postrouting.set_type(ChainType::Nat);
postrouting.set_hook(Hook::new(HookClass::PostRouting, 100));
postrouting.set_policy(ChainPolicy::Accept);
batch.add(&postrouting, MsgType::Add);
let rule = Rule::new(&postrouting)?.oface("rsppp0")?.masquerade();
batch.add(&rule, MsgType::Add);
// +------------------+
// | PREROUTING chain |
// +------------------+
let mut prerouting = Chain::new(&nat).with_name("PREROUTING");
prerouting.set_type(ChainType::Nat);
prerouting.set_hook(Hook::new(HookClass::PreRouting, -100));
prerouting.set_policy(ChainPolicy::Accept);
batch.add(&prerouting, MsgType::Add);
for port in 5060..=5080 {
let dnat_sip = Rule::new(&prerouting)?
.iface("rsppp0")?
.dport(port, Protocol::UDP)
.dnat("10.128.40.252".parse()?, None);
batch.add(&dnat_sip, MsgType::Add);
}
for port in 16384..=16482 {
let dnat_rtp = Rule::new(&prerouting)?
.iface("rsppp0")?
.dport(port, Protocol::UDP)
.dnat("10.128.40.252".parse()?, None);
batch.add(&dnat_rtp, MsgType::Add);
}
batch.send()?;
Ok(())
}
fn filter() -> Result<()> {
let mut batch = Batch::new();
let filter = Table::new(ProtocolFamily::Inet).with_name("filter");
batch.add(&filter, MsgType::Add);
// +-------------+
// | INPUT chain |
// +-------------+
let mut input = Chain::new(&filter).with_name("INPUT");
input.set_type(ChainType::Filter);
input.set_hook(Hook::new(HookClass::In, 0));
input.set_policy(ChainPolicy::Accept);
batch.add(&input, MsgType::Add);
let allow_established = Rule::new(&input)?.established()?.accept();
batch.add(&allow_established, MsgType::Add);
let allow_icmp4 = Rule::new(&input)?.icmp().accept();
batch.add(&allow_icmp4, MsgType::Add);
let allow_icmp6 = Rule::new(&input)?.icmpv6().accept();
batch.add(&allow_icmp6, MsgType::Add);
let allow_6in4 = Rule::new(&input)?.ip6in4().accept();
batch.add(&allow_6in4, MsgType::Add);
let deny_wan4 = Rule::new(&input)?.iface("rsppp0")?.drop();
batch.add(&deny_wan4, MsgType::Add);
let allow_isolated_dhcp = Rule::new(&input)?
.iface("eth0.30")?
.dport(67, Protocol::UDP)
.accept();
batch.add(&allow_isolated_dhcp, MsgType::Add);
let deny_isolated = Rule::new(&input)?.iface("eth0.30")?.drop();
batch.add(&deny_isolated, MsgType::Add);
let allow_untrusted_dhcp = Rule::new(&input)?
.iface("eth0.20")?
.dport(67, Protocol::UDP)
.accept();
batch.add(&allow_untrusted_dhcp, MsgType::Add);
let allow_untrusted_dns = Rule::new(&input)?
.iface("eth0.20")?
.dport(53, Protocol::UDP)
.accept();
batch.add(&allow_untrusted_dns, MsgType::Add);
let deny_untrusted = Rule::new(&input)?.iface("eth0.20")?.drop();
batch.add(&deny_untrusted, MsgType::Add);
// +---------------+
// | FORWARD chain |
// +---------------+
let mut forward = Chain::new(&filter).with_name("FORWARD");
forward.set_type(ChainType::Filter);
forward.set_hook(Hook::new(HookClass::Forward, 0));
forward.set_policy(ChainPolicy::Drop);
batch.add(&forward, MsgType::Add);
let deny_isolated_to_any = Rule::new(&forward)?.iface("eth0.30")?.drop();
batch.add(&deny_isolated_to_any, MsgType::Add);
let deny_any_to_isolated = Rule::new(&forward)?.oface("eth0.30")?.drop();
batch.add(&deny_any_to_isolated, MsgType::Add);
let clamp_mss_inbound = Rule::new(&forward)?
.iface("rsppp0")?
.protocol(Protocol::TCP)
.syn()?
.clamp_mss_to_pmtu();
batch.add(&clamp_mss_inbound, MsgType::Add);
let clamp_mss_outbound = Rule::new(&forward)?
.oface("rsppp0")?
.protocol(Protocol::TCP)
.syn()?
.clamp_mss_to_pmtu();
batch.add(&clamp_mss_outbound, MsgType::Add);
let allow_established = Rule::new(&forward)?.established()?.accept();
batch.add(&allow_established, MsgType::Add);
let allow_mgmt_to_wan4 = Rule::new(&forward)?
.iface("eth0")?
.oface("rsppp0")?
.accept();
batch.add(&allow_mgmt_to_wan4, MsgType::Add);
let allow_trusted_to_wan4 = Rule::new(&forward)?
.iface("eth0.10")?
.oface("rsppp0")?
.accept();
batch.add(&allow_trusted_to_wan4, MsgType::Add);
let allow_untrusted_to_wan4 = Rule::new(&forward)?
.iface("eth0.20")?
.oface("rsppp0")?
.accept();
batch.add(&allow_untrusted_to_wan4, MsgType::Add);
let allow_exposed_to_wan4 = Rule::new(&forward)?
.iface("eth0.40")?
.oface("rsppp0")?
.accept();
batch.add(&allow_exposed_to_wan4, MsgType::Add);
let allow_any_to_exposed = Rule::new(&forward)?.oface("eth0.40")?.accept();
batch.add(&allow_any_to_exposed, MsgType::Add);
let allow_icmp4_to_any = Rule::new(&forward)?.icmp().accept();
batch.add(&allow_icmp4_to_any, MsgType::Add);
let allow_icmp6_to_any = Rule::new(&forward)?.icmpv6().accept();
batch.add(&allow_icmp6_to_any, MsgType::Add);
batch.send()?;
Ok(())
}
fn main() -> Result<()> {
match nat() {
Ok(_) => println!("[netfilterd] enable nat"),
Err(e) => {
println!("[netfilterd] can't enable nat: {}", e);
return Err(e);
}
}
match filter() {
Ok(_) => println!("[netfilterd] activate acl"),
Err(e) => {
println!("[netfilterd] can't activate acl: {}", e);
return Err(e);
}
}
Ok(())
}
|
