forked from Deuxfleurs/diplonat
changing backend to use the cleaner ipt bindings
updating dependencies minor fixes
This commit is contained in:
darkgallium
parent
1a9199011d
commit
2dbf9da005
4 changed files with 169 additions and 212 deletions
238
Cargo.lock
generated
238
Cargo.lock
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@ -1,5 +1,14 @@
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@ -163,24 +177,10 @@ dependencies = [
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|
||||
checksum = "3c1cb601d29fe2c2ac60a2b2e5e293994d87a1f6fa9687a31a15270f909be9c2"
|
||||
dependencies = [
|
||||
"bitflags",
|
||||
"bitflags 1.2.1",
|
||||
]
|
||||
|
||||
[[package]]
|
||||
|
|
|
|||
|
|
@ -17,6 +17,5 @@ serde = { version = "1.0.107", features = ["derive"] }
|
|||
serde_json = "1.0.53"
|
||||
serde-lexpr = "0.1.1"
|
||||
anyhow = "1.0.28"
|
||||
nftnl = "0.3.0"
|
||||
mnl = "0.2.0"
|
||||
libc = "0.2.70"
|
||||
iptables = "0.2.2"
|
||||
regex = "1"
|
||||
|
|
|
|||
141
src/fw.rs
141
src/fw.rs
|
|
@ -1,101 +1,64 @@
|
|||
use nftnl::{nft_expr, Batch, Chain, FinalizedBatch, ProtoFamily, Rule, Table};
|
||||
use std::{
|
||||
ffi::{self, CString},
|
||||
io,
|
||||
};
|
||||
use mnl;
|
||||
use libc;
|
||||
use iptables;
|
||||
use regex::Regex;
|
||||
use std::collections::HashSet;
|
||||
|
||||
const TABLE_NAME: &str = "diplonat";
|
||||
const OUT_CHAIN_NAME: &str = "out";
|
||||
const IN_CHAIN_NAME: &str = "in";
|
||||
#[derive(PartialEq,Eq,Debug,Hash)]
|
||||
pub struct Port {
|
||||
proto: String,
|
||||
number: u16,
|
||||
}
|
||||
|
||||
#[derive(Debug)]
|
||||
struct Error(String);
|
||||
pub fn setup(ipt: &iptables::IPTables) {
|
||||
ipt.new_chain("filter", "DIPLONAT").unwrap();
|
||||
ipt.insert("filter", "INPUT", "-j DIPLONAT", 1).unwrap();
|
||||
}
|
||||
|
||||
impl From<io::Error> for Error {
|
||||
fn from(error: io::Error) -> Self {
|
||||
Error(error.to_string())
|
||||
pub fn open_ports(ipt: &iptables::IPTables, ports: Vec<Port>) {
|
||||
|
||||
for p in ports {
|
||||
ipt.append("filter", "DIPLONAT", &format!("-p {} --dport {} -j ACCEPT", p.proto, p.number)).unwrap();
|
||||
}
|
||||
}
|
||||
|
||||
impl From<ffi::NulError> for Error {
|
||||
fn from(error: ffi::NulError) -> Self {
|
||||
Error(error.to_string())
|
||||
pub fn get_opened_ports(ipt: &iptables::IPTables) -> HashSet<Port> {
|
||||
let mut opened_ports: HashSet<Port> = HashSet::new();
|
||||
|
||||
let list = ipt.list("filter", "DIPLONAT").unwrap();
|
||||
let re = Regex::new(r"\-A.*? \-p (\w+).*\-\-dport (\d+).*?\-j ACCEPT").unwrap();
|
||||
for i in list {
|
||||
let caps = re.captures(&i);
|
||||
match caps {
|
||||
Some(c) => {
|
||||
let raw_proto = c.get(1).unwrap();
|
||||
let raw_port = c.get(2).unwrap();
|
||||
|
||||
let proto = String::from(raw_proto.as_str());
|
||||
let number = String::from(raw_port.as_str()).parse::<u16>().unwrap();
|
||||
|
||||
opened_ports.insert( Port { proto, number } );
|
||||
},
|
||||
_ => {}
|
||||
}
|
||||
}
|
||||
|
||||
opened_ports
|
||||
}
|
||||
|
||||
fn send_and_process(batch: &FinalizedBatch) -> Result<(), Error> {
|
||||
let socket = mnl::Socket::new(mnl::Bus::Netfilter)?;
|
||||
socket.send_all(batch)?;
|
||||
|
||||
let portid = socket.portid();
|
||||
let mut buffer = vec![0; nftnl::nft_nlmsg_maxsize() as usize];
|
||||
|
||||
while let Some(message) = socket_recv(&socket, &mut buffer[..])? {
|
||||
match mnl::cb_run(message, 2, portid)? {
|
||||
mnl::CbResult::Stop => {
|
||||
break;
|
||||
}
|
||||
mnl::CbResult::Ok => (),
|
||||
}
|
||||
}
|
||||
Ok(())
|
||||
pub fn cleanup(ipt: &iptables::IPTables) {
|
||||
ipt.flush_chain("filter", "DIPLONAT").unwrap();
|
||||
ipt.delete("filter", "INPUT", "-j DIPLONAT").unwrap();
|
||||
ipt.delete_chain("filter", "DIPLONAT").unwrap();
|
||||
}
|
||||
|
||||
fn socket_recv<'a>(socket: &mnl::Socket, buf: &'a mut [u8]) -> Result<Option<&'a [u8]>, Error> {
|
||||
let ret = socket.recv(buf)?;
|
||||
if ret > 0 {
|
||||
Ok(Some(&buf[..ret]))
|
||||
} else {
|
||||
Ok(None)
|
||||
}
|
||||
}
|
||||
|
||||
fn add_port_allowed(port: u16) -> Result<(), Error> {
|
||||
let mut batch = Batch::new();
|
||||
|
||||
// TODO: at the moment, I haven't found a way to properly separate setup part (create table and
|
||||
// chains) and the add rule part because the add rule part needs a reference on the chains.
|
||||
// apparently creating a table and chains that already exist seems to do nothing so it works
|
||||
// doing the following. To be done properly though
|
||||
|
||||
let table = Table::new(&CString::new(TABLE_NAME).unwrap(), ProtoFamily::Inet);
|
||||
|
||||
batch.add(&table, nftnl::MsgType::Add);
|
||||
|
||||
let mut out_chain = Chain::new(&CString::new(OUT_CHAIN_NAME).unwrap(), &table);
|
||||
let mut in_chain = Chain::new(&CString::new(IN_CHAIN_NAME).unwrap(), &table);
|
||||
|
||||
out_chain.set_hook(nftnl::Hook::Out, 0);
|
||||
in_chain.set_hook(nftnl::Hook::In, 0);
|
||||
|
||||
out_chain.set_policy(nftnl::Policy::Accept);
|
||||
in_chain.set_policy(nftnl::Policy::Drop);
|
||||
|
||||
batch.add(&out_chain, nftnl::MsgType::Add);
|
||||
batch.add(&in_chain, nftnl::MsgType::Add);
|
||||
|
||||
let mut _rule = Rule::new(&in_chain);
|
||||
|
||||
_rule.add_expr(&nft_expr!(meta nfproto));
|
||||
_rule.add_expr(&nft_expr!(cmp == libc::NFPROTO_IPV4 as u8));
|
||||
|
||||
_rule.add_expr(&nft_expr!(meta l4proto));
|
||||
_rule.add_expr(&nft_expr!(cmp == libc::IPPROTO_TCP as u8));
|
||||
|
||||
_rule.add_expr(&nftnl::expr::Payload::Transport(
|
||||
nftnl::expr::TransportHeaderField::Tcp(nftnl::expr::TcpHeaderField::Dport),
|
||||
));
|
||||
_rule.add_expr(&nft_expr!(cmp == port.to_be()));
|
||||
|
||||
_rule.add_expr(&nft_expr!(verdict accept));
|
||||
|
||||
batch.add(&_rule, nftnl::MsgType::Add);
|
||||
|
||||
let finalized_batch = batch.finalize();
|
||||
send_and_process(&finalized_batch)?;
|
||||
|
||||
Ok(())
|
||||
|
||||
/*
|
||||
fn main() {
|
||||
let ipt = iptables::new(false).unwrap();
|
||||
setup(&ipt);
|
||||
|
||||
let mut test: HashSet<Port> = HashSet::new();
|
||||
test.insert(Port { proto: String::from("tcp"), number: 443 });
|
||||
let a = get_opened_ports(&ipt);
|
||||
let l = test.difference(&a).collect::<Vec<&Port>>();
|
||||
println!("{:?}", l);
|
||||
}
|
||||
*/
|
||||
|
|
|
|||
|
|
@ -4,7 +4,9 @@ mod consul;
|
|||
mod consul_actor;
|
||||
mod igd_actor;
|
||||
mod diplonat;
|
||||
mod fw;
|
||||
|
||||
use iptables;
|
||||
use log::*;
|
||||
use diplonat::Diplonat;
|
||||
|
||||
|
|
@ -13,6 +15,9 @@ async fn main() {
|
|||
pretty_env_logger::init();
|
||||
info!("Starting Diplonat");
|
||||
|
||||
let ipt = iptables::new(false).unwrap();
|
||||
fw::setup(&ipt).expect("iptables setup failed");
|
||||
|
||||
let mut diplo = Diplonat::new().await.expect("Setup failed");
|
||||
diplo.listen().await.expect("A runtime error occured");
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in a new issue