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corrections after review

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This commit is contained in:
darkgallium 2020-07-04 16:59:41 +02:00
parent a59ed38121
commit 4f4b6b048d
2 changed files with 40 additions and 35 deletions
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67
src/fw.rs
View file

@ -2,61 +2,58 @@ use iptables;
use regex::Regex;
use std::collections::HashSet;
use crate::messages;
use anyhow::{Result,Context};
use log::*;
#[derive(Debug)]
pub struct FirewallError(String);
pub fn setup(ipt: &iptables::IPTables) -> Result<()> {
impl From<iptables::error::IPTError> for FirewallError {
fn from(error: iptables::error::IPTError) -> Self {
FirewallError(error.to_string())
}
}
pub fn setup(ipt: &iptables::IPTables) -> Result<(), FirewallError> {
if !ipt.chain_exists("filter", "DIPLONAT")? {
ipt.new_chain("filter", "DIPLONAT")?;
}
ipt.insert_unique("filter", "INPUT", "-j DIPLONAT", 1)?;
// ensure we start from a clean state without any rule already set
cleanup(ipt)?;
ipt.new_chain("filter", "DIPLONAT").context("Failed to create new chain")?;
ipt.insert_unique("filter", "INPUT", "-j DIPLONAT", 1).context("Failed to insert jump rule")?;
Ok(())
}
pub fn open_ports(ipt: &iptables::IPTables, ports: messages::PublicExposedPorts) -> Result<(), FirewallError> {
pub fn open_ports(ipt: &iptables::IPTables, ports: messages::PublicExposedPorts) -> Result<()> {
for p in ports.tcp_ports {
ipt.append("filter", "DIPLONAT", &format!("-p tcp --dport {} -j ACCEPT", p))?;
ipt.append("filter", "DIPLONAT", &format!("-p tcp --dport {} -j ACCEPT", p)).context("Failed to insert port rule")?;
}
for p in ports.udp_ports {
ipt.append("filter", "DIPLONAT", &format!("-p udp --dport {} -j ACCEPT", p))?;
ipt.append("filter", "DIPLONAT", &format!("-p udp --dport {} -j ACCEPT", p)).context("Failed to insert port rule")?;
}
Ok(())
}
pub fn get_opened_ports(ipt: &iptables::IPTables) -> Result<messages::PublicExposedPorts, FirewallError> {
pub fn get_opened_ports(ipt: &iptables::IPTables) -> Result<messages::PublicExposedPorts> {
let mut ports = messages::PublicExposedPorts {
tcp_ports: HashSet::new(),
udp_ports: HashSet::new()
};
let list = ipt.list("filter", "DIPLONAT")?;
let re = Regex::new(r"\-A.*? \-p (\w+).*\-\-dport (\d+).*?\-j ACCEPT").unwrap();
let re = Regex::new(r"\-A.*? \-p (\w+).*\-\-dport (\d+).*?\-j ACCEPT").context("Regex matching open ports encountered an unexpected rule")?;
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();
if let (Some(raw_proto), Some(raw_port)) = (c.get(1), c.get(2)) {
let proto = String::from(raw_proto.as_str());
let number = String::from(raw_port.as_str()).parse::<u16>().unwrap();
let proto = String::from(raw_proto.as_str());
let number = String::from(raw_port.as_str()).parse::<u16>()?;
if proto == "tcp" {
ports.tcp_ports.insert(number);
} else {
ports.udp_ports.insert(number);
}
if proto == "tcp" {
ports.tcp_ports.insert(number);
} else {
ports.udp_ports.insert(number);
error!("Unexpected rule found in DIPLONAT chain")
}
},
@ -67,10 +64,18 @@ pub fn get_opened_ports(ipt: &iptables::IPTables) -> Result<messages::PublicExpo
Ok(ports)
}
pub fn cleanup(ipt: &iptables::IPTables) -> Result<(), FirewallError> {
ipt.flush_chain("filter", "DIPLONAT")?;
ipt.delete("filter", "INPUT", "-j DIPLONAT")?;
ipt.delete_chain("filter", "DIPLONAT")?;
pub fn cleanup(ipt: &iptables::IPTables) -> Result<()> {
if ipt.chain_exists("filter", "DIPLONAT")? {
ipt.flush_chain("filter", "DIPLONAT").context("Failed to flush the DIPLONAT chain")?;
if ipt.exists("filter", "INPUT", "-j DIPLONAT")? {
ipt.delete("filter", "INPUT", "-j DIPLONAT").context("Failed to delete jump rule")?;
}
ipt.delete_chain("filter", "DIPLONAT").context("Failed to delete chain")?;
}
Ok(())
}

8
src/fw_actor.rs
View file

@ -23,13 +23,13 @@ pub struct FirewallActor {
impl FirewallActor {
pub async fn new(_refresh: Duration, rxp: &watch::Receiver<messages::PublicExposedPorts>) -> Result<Self> {
let ctx = Self {
ipt: iptables::new(false).unwrap(),
ipt: iptables::new(false)?,
rx_ports: rxp.clone(),
last_ports: messages::PublicExposedPorts::new(),
refresh: _refresh,
};
fw::setup(&ctx.ipt).expect("iptables setup failed");
fw::setup(&ctx.ipt)?;
return Ok(ctx);
}
@ -56,7 +56,7 @@ impl FirewallActor {
}
pub async fn do_fw_update(&self) -> Result<()> {
let curr_opened_ports = fw::get_opened_ports(&self.ipt).unwrap();
let curr_opened_ports = fw::get_opened_ports(&self.ipt)?;
let diff_tcp = self.last_ports.tcp_ports.difference(&curr_opened_ports.tcp_ports).copied().collect::<HashSet<u16>>();
let diff_udp = self.last_ports.udp_ports.difference(&curr_opened_ports.udp_ports).copied().collect::<HashSet<u16>>();
@ -66,7 +66,7 @@ impl FirewallActor {
udp_ports: diff_udp
};
fw::open_ports(&self.ipt, ports_to_open).unwrap();
fw::open_ports(&self.ipt, ports_to_open)?;
return Ok(());
}