104 lines
2.6 KiB
Rust
104 lines
2.6 KiB
Rust
use std::collections::HashSet;
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use anyhow::{Context, Result};
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use iptables;
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use log::*;
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use regex::Regex;
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use crate::messages;
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pub fn setup(ipt: &iptables::IPTables) -> Result<()> {
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// ensure we start from a clean state without any rule already set
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cleanup(ipt)?;
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info!("{}: creating DIPLONAT chain using", ipt.cmd);
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ipt
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.new_chain("filter", "DIPLONAT")
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.context("Failed to create new chain")?;
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ipt
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.insert_unique("filter", "INPUT", "-j DIPLONAT", 1)
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.context("Failed to insert jump rule")?;
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Ok(())
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}
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pub fn open_ports(ipt: &iptables::IPTables, ports: messages::PublicExposedPorts) -> Result<()> {
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for p in ports.tcp_ports {
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info!("{}: opening TCP port {}", ipt.cmd, p);
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ipt
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.append(
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"filter",
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"DIPLONAT",
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&format!("-p tcp --dport {} -j ACCEPT", p),
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)
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.context("Failed to insert port rule")?;
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}
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for p in ports.udp_ports {
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info!("{}: opening UDP port {}", ipt.cmd, p);
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ipt
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.append(
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"filter",
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"DIPLONAT",
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&format!("-p udp --dport {} -j ACCEPT", p),
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)
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.context("Failed to insert port rule")?;
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}
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Ok(())
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}
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pub fn get_opened_ports(ipt: &iptables::IPTables) -> Result<messages::PublicExposedPorts> {
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let mut ports = messages::PublicExposedPorts {
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tcp_ports: HashSet::new(),
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udp_ports: HashSet::new(),
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};
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let list = ipt.list("filter", "DIPLONAT")?;
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let re = Regex::new(r"\-A.*? \-p (\w+).*\-\-dport (\d+).*?\-j ACCEPT")
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.context("Regex matching open ports encountered an unexpected rule")?;
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for i in list {
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let caps = re.captures(&i);
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match caps {
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Some(c) => {
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if let (Some(raw_proto), Some(raw_port)) = (c.get(1), c.get(2)) {
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let proto = String::from(raw_proto.as_str());
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let number = String::from(raw_port.as_str()).parse::<u16>()?;
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if proto == "tcp" {
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ports.tcp_ports.insert(number);
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} else {
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ports.udp_ports.insert(number);
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}
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} else {
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error!("Unexpected rule found in DIPLONAT chain")
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}
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}
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_ => {}
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}
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}
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Ok(ports)
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}
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pub fn cleanup(ipt: &iptables::IPTables) -> Result<()> {
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if ipt.chain_exists("filter", "DIPLONAT")? {
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info!("{}: removing old DIPLONAT chain", ipt.cmd);
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ipt
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.flush_chain("filter", "DIPLONAT")
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.context("Failed to flush the DIPLONAT chain")?;
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if ipt.exists("filter", "INPUT", "-j DIPLONAT")? {
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ipt
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.delete("filter", "INPUT", "-j DIPLONAT")
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.context("Failed to delete jump rule")?;
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}
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ipt
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.delete_chain("filter", "DIPLONAT")
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.context("Failed to delete chain")?;
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}
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Ok(())
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}
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