forked from cloudflare/boringtun
/
mod.rs
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/
mod.rs
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// Copyright (c) 2019 Cloudflare, Inc. All rights reserved.
// SPDX-License-Identifier: BSD-3-Clause
pub mod allowed_ips;
pub mod api;
mod dev_lock;
pub mod drop_privileges;
mod integration_tests;
pub mod peer;
#[cfg(any(target_os = "macos", target_os = "ios"))]
#[path = "kqueue.rs"]
pub mod poll;
#[cfg(target_os = "linux")]
#[path = "epoll.rs"]
pub mod poll;
#[cfg(any(target_os = "macos", target_os = "ios"))]
#[path = "tun_darwin.rs"]
pub mod tun;
#[cfg(target_os = "linux")]
#[path = "tun_linux.rs"]
pub mod tun;
#[cfg(unix)]
#[path = "udp_unix.rs"]
pub mod udp;
use std::collections::HashMap;
use std::convert::From;
use std::io;
use std::net::{IpAddr, SocketAddr};
use std::os::unix::io::AsRawFd;
use std::sync::atomic::{AtomicUsize, Ordering};
use std::sync::Arc;
use std::thread;
use std::thread::JoinHandle;
use crate::crypto::{X25519PublicKey, X25519SecretKey};
use crate::noise::errors::WireGuardError;
use crate::noise::handshake::parse_handshake_anon;
use crate::noise::rate_limiter::RateLimiter;
use crate::noise::{make_array, Packet, Tunn, TunnResult};
use allowed_ips::AllowedIps;
use peer::{AllowedIP, Peer};
use poll::{EventPoll, EventRef, WaitResult};
use tun::{errno, errno_str, TunSocket};
use udp::UDPSocket;
use dev_lock::{Lock, LockReadGuard};
use slog::{error, info, o, Discard, Logger};
const HANDSHAKE_RATE_LIMIT: u64 = 100; // The number of handshakes per second we can tolerate before using cookies
const MAX_UDP_SIZE: usize = (1 << 16) - 1;
const MAX_ITR: usize = 100; // Number of packets to handle per handler call
#[derive(Debug)]
pub enum Error {
Socket(String),
Bind(String),
FCntl(String),
EventQueue(String),
IOCtl(String),
Connect(String),
SetSockOpt(String),
InvalidTunnelName,
#[cfg(any(target_os = "macos", target_os = "ios"))]
GetSockOpt(String),
GetSockName(String),
UDPRead(i32),
#[cfg(target_os = "linux")]
Timer(String),
IfaceRead(i32),
DropPrivileges(String),
ApiSocket(std::io::Error),
}
// What the event loop should do after a handler returns
enum Action {
Continue, // Continue the loop
Yield, // Yield the read lock and acquire it again
Exit, // Stop the loop
}
// Event handler function
type Handler = Box<dyn Fn(&mut LockReadGuard<Device>, &mut ThreadData) -> Action + Send + Sync>;
pub struct DeviceHandle {
device: Arc<Lock<Device>>, // The interface this handle owns
threads: Vec<JoinHandle<()>>,
}
pub struct DeviceConfig {
pub n_threads: usize,
pub use_connected_socket: bool,
pub logger: Logger,
#[cfg(target_os = "linux")]
pub use_multi_queue: bool,
}
impl Default for DeviceConfig {
fn default() -> Self {
DeviceConfig {
n_threads: 4,
use_connected_socket: true,
logger: Logger::root(Discard, o!()),
#[cfg(target_os = "linux")]
use_multi_queue: true,
}
}
}
pub struct Device {
key_pair: Option<(Arc<X25519SecretKey>, Arc<X25519PublicKey>)>,
queue: Arc<EventPoll<Handler>>,
listen_port: u16,
fwmark: Option<u32>,
iface: Arc<TunSocket>,
udp4: Option<Arc<UDPSocket>>,
udp6: Option<Arc<UDPSocket>>,
yield_notice: Option<EventRef>,
exit_notice: Option<EventRef>,
peers: HashMap<Arc<X25519PublicKey>, Arc<Peer>>,
peers_by_ip: AllowedIps<Arc<Peer>>,
peers_by_idx: HashMap<u32, Arc<Peer>>,
next_index: u32,
config: DeviceConfig,
cleanup_paths: Vec<String>,
mtu: AtomicUsize,
rate_limiter: Option<Arc<RateLimiter>>,
}
struct ThreadData {
iface: Arc<TunSocket>,
src_buf: [u8; MAX_UDP_SIZE],
dst_buf: [u8; MAX_UDP_SIZE],
}
impl DeviceHandle {
pub fn new(name: &str, config: DeviceConfig) -> Result<DeviceHandle, Error> {
let n_threads = config.n_threads;
let mut wg_interface = Device::new(name, config)?;
wg_interface.open_listen_socket(0)?; // Start listening on a random port
let interface_lock = Arc::new(Lock::new(wg_interface));
let mut threads = vec![];
for i in 0..n_threads {
threads.push({
let dev = Arc::clone(&interface_lock);
thread::spawn(move || DeviceHandle::event_loop(i, &dev))
});
}
Ok(DeviceHandle {
device: interface_lock,
threads,
})
}
pub fn wait(&mut self) {
while let Some(thread) = self.threads.pop() {
thread.join().unwrap();
}
}
pub fn clean(&mut self) {
for path in &self.device.read().cleanup_paths {
// attempt to remove any file we created in the work dir
let _ = std::fs::remove_file(&path);
}
}
fn event_loop(_i: usize, device: &Lock<Device>) {
#[cfg(target_os = "linux")]
let mut thread_local = ThreadData {
src_buf: [0u8; MAX_UDP_SIZE],
dst_buf: [0u8; MAX_UDP_SIZE],
iface: if _i == 0 || !device.read().config.use_multi_queue {
// For the first thread use the original iface
Arc::clone(&device.read().iface)
} else {
// For for the rest create a new iface queue
let iface_local = Arc::new(
TunSocket::new(&device.read().iface.name().unwrap())
.unwrap()
.set_non_blocking()
.unwrap(),
);
device
.read()
.register_iface_handler(Arc::clone(&iface_local))
.ok();
iface_local
},
};
#[cfg(not(target_os = "linux"))]
let mut thread_local = ThreadData {
src_buf: [0u8; MAX_UDP_SIZE],
dst_buf: [0u8; MAX_UDP_SIZE],
iface: Arc::clone(&device.read().iface),
};
loop {
// The event loop keeps a read lock on the device, because we assume write access is rarely needed
let mut device_lock = device.read();
let queue = Arc::clone(&device_lock.queue);
loop {
match queue.wait() {
WaitResult::Ok(handler) => {
let action = (*handler)(&mut device_lock, &mut thread_local);
match action {
Action::Continue => {}
Action::Yield => break,
Action::Exit => {
device_lock.trigger_exit();
return;
}
}
}
WaitResult::EoF(handler) => {
handler.cancel();
}
WaitResult::Error(e) => error!(device_lock.config.logger, "Poll error {:}", e),
}
}
}
}
}
impl Drop for DeviceHandle {
fn drop(&mut self) {
self.device.read().trigger_exit();
self.clean();
}
}
impl Device {
fn next_index(&mut self) -> u32 {
let next_index = self.next_index;
self.next_index += 1;
assert!(next_index < (1 << 24), "Too many peers created");
next_index
}
fn remove_peer(&mut self, pub_key: &X25519PublicKey) {
if let Some(peer) = self.peers.remove(pub_key) {
// Found a peer to remove, now purge all references to it:
peer.shutdown_endpoint(); // close open udp socket and free the closure
self.peers_by_idx.remove(&peer.index()); // peers_by_idx
self.peers_by_ip
.remove(&|p: &Arc<Peer>| Arc::ptr_eq(&peer, p)); // peers_by_ip
info!(peer.tunnel.logger, "Peer removed");
}
}
#[allow(clippy::too_many_arguments)]
fn update_peer(
&mut self,
pub_key: X25519PublicKey,
remove: bool,
_replace_ips: bool,
endpoint: Option<SocketAddr>,
allowed_ips: Vec<AllowedIP>,
keepalive: Option<u16>,
preshared_key: Option<[u8; 32]>,
) {
let pub_key = Arc::new(pub_key);
if remove {
// Completely remove a peer
return self.remove_peer(&pub_key);
}
// Update an existing peer
if self.peers.get(&pub_key).is_some() {
// We already have a peer, we need to merge the existing config into the newly created one
panic!("Modifying existing peers is not yet supported. Remove and add again instead.");
}
let next_index = self.next_index();
let device_key_pair = self
.key_pair
.as_ref()
.expect("Private key must be set first");
let mut tunn = Tunn::new(
Arc::clone(&device_key_pair.0),
Arc::clone(&pub_key),
preshared_key,
keepalive,
next_index,
None,
)
.unwrap();
{
let pub_key = base64::encode(pub_key.as_bytes());
let peer_name = format!("{}…{}", &pub_key[0..4], &pub_key[pub_key.len() - 4..]);
let peer_logger = self.config.logger.new(o!("peer" => peer_name));
tunn.set_logger(peer_logger);
}
let peer = Peer::new(tunn, next_index, endpoint, &allowed_ips, preshared_key);
let peer = Arc::new(peer);
self.peers.insert(pub_key, Arc::clone(&peer));
self.peers_by_idx.insert(next_index, Arc::clone(&peer));
for AllowedIP { addr, cidr } in allowed_ips {
self.peers_by_ip.insert(addr, cidr as _, Arc::clone(&peer));
}
info!(peer.tunnel.logger, "Peer added");
}
pub fn new(name: &str, config: DeviceConfig) -> Result<Device, Error> {
let poll = EventPoll::<Handler>::new()?;
// Create a tunnel device
let iface = Arc::new(TunSocket::new(name)?.set_non_blocking()?);
let mtu = iface.mtu()?;
let mut device = Device {
queue: Arc::new(poll),
iface,
config,
exit_notice: Default::default(),
yield_notice: Default::default(),
fwmark: Default::default(),
key_pair: Default::default(),
listen_port: Default::default(),
next_index: Default::default(),
peers: Default::default(),
peers_by_idx: Default::default(),
peers_by_ip: AllowedIps::new(),
udp4: Default::default(),
udp6: Default::default(),
cleanup_paths: Default::default(),
mtu: AtomicUsize::new(mtu),
rate_limiter: None,
};
device.register_api_handler()?;
device.register_iface_handler(Arc::clone(&device.iface))?;
device.register_notifiers()?;
device.register_timers()?;
#[cfg(target_os = "macos")]
{
// Only for macOS write the actual socket name into WG_TUN_NAME_FILE
if let Ok(name_file) = std::env::var("WG_TUN_NAME_FILE") {
if name == "utun" {
std::fs::write(&name_file, device.iface.name().unwrap().as_bytes()).unwrap();
device.cleanup_paths.push(name_file);
}
}
}
Ok(device)
}
fn open_listen_socket(&mut self, mut port: u16) -> Result<(), Error> {
// Binds the network facing interfaces
// First close any existing open socket, and remove them from the event loop
if let Some(s) = self.udp4.take() {
unsafe {
// This is safe because the event loop is not running yet
self.queue.clear_event_by_fd(s.as_raw_fd())
}
};
if let Some(s) = self.udp6.take() {
unsafe { self.queue.clear_event_by_fd(s.as_raw_fd()) };
}
for peer in self.peers.values() {
peer.shutdown_endpoint();
}
// Then open new sockets and bind to the port
let udp_sock4 = Arc::new(
UDPSocket::new()?
.set_non_blocking()?
.set_reuse()?
.bind(port)?,
);
if port == 0 {
// Random port was assigned
port = udp_sock4.port()?;
}
let udp_sock6 = Arc::new(
UDPSocket::new6()?
.set_non_blocking()?
.set_reuse()?
.bind(port)?,
);
self.register_udp_handler(Arc::clone(&udp_sock4))?;
self.register_udp_handler(Arc::clone(&udp_sock6))?;
self.udp4 = Some(udp_sock4);
self.udp6 = Some(udp_sock6);
self.listen_port = port;
Ok(())
}
fn set_key(&mut self, private_key: X25519SecretKey) {
let mut bad_peers = vec![];
let private_key = Arc::new(private_key);
let public_key = Arc::new(private_key.public_key());
let rate_limiter = Arc::new(RateLimiter::new(&public_key, HANDSHAKE_RATE_LIMIT));
for peer in self.peers.values_mut() {
// Taking a pointer should be Ok as long as all other threads are stopped
let mut_ptr = Arc::into_raw(Arc::clone(peer)) as *mut Peer;
if unsafe {
mut_ptr.as_mut().unwrap().tunnel.set_static_private(
Arc::clone(&private_key),
Arc::clone(&public_key),
Some(Arc::clone(&rate_limiter)),
)
}
.is_err()
{
// In case we encounter an error, we will remove that peer
// An error will be a result of bad public key/secret key combination
bad_peers.push(peer);
}
}
self.key_pair = Some((private_key, public_key));
self.rate_limiter = Some(rate_limiter);
// Remove all the bad peers
for _ in bad_peers {
unimplemented!();
}
}
fn set_fwmark(&mut self, mark: u32) -> Result<(), Error> {
self.fwmark = Some(mark);
// First set fwmark on listeners
if let Some(ref sock) = self.udp4 {
sock.set_fwmark(mark)?;
}
if let Some(ref sock) = self.udp6 {
sock.set_fwmark(mark)?;
}
// Then on all currently connected sockets
for peer in self.peers.values() {
if let Some(ref sock) = peer.endpoint().conn {
sock.set_fwmark(mark)?
}
}
Ok(())
}
fn clear_peers(&mut self) {
self.peers.clear();
self.peers_by_idx.clear();
self.peers_by_ip.clear();
}
fn register_notifiers(&mut self) -> Result<(), Error> {
let yield_ev = self
.queue
// The notification event handler simply returns Action::Yield
.new_notifier(Box::new(|_, _| Action::Yield))?;
self.yield_notice = Some(yield_ev);
let exit_ev = self
.queue
// The exit event handler simply returns Action::Exit
.new_notifier(Box::new(|_, _| Action::Exit))?;
self.exit_notice = Some(exit_ev);
Ok(())
}
fn register_timers(&self) -> Result<(), Error> {
self.queue.new_periodic_event(
// Reset the rate limiter every second give or take
Box::new(|d, _| {
if let Some(r) = d.rate_limiter.as_ref() {
r.reset_count()
}
Action::Continue
}),
std::time::Duration::from_secs(1),
)?;
self.queue.new_periodic_event(
// Execute the timed function of every peer in the list
Box::new(|d, t| {
let peer_map = &d.peers;
let (udp4, udp6) = match (d.udp4.as_ref(), d.udp6.as_ref()) {
(Some(udp4), Some(udp6)) => (udp4, udp6),
_ => return Action::Continue,
};
// Go over each peer and invoke the timer function
for peer in peer_map.values() {
let endpoint_addr = match peer.endpoint().addr {
Some(addr) => addr,
None => continue,
};
match peer.update_timers(&mut t.dst_buf[..]) {
TunnResult::Done => {}
TunnResult::Err(WireGuardError::ConnectionExpired) => {
peer.shutdown_endpoint(); // close open udp socket
}
TunnResult::Err(e) => error!(d.config.logger, "Timer error {:?}", e),
TunnResult::WriteToNetwork(packet) => {
match endpoint_addr {
SocketAddr::V4(_) => udp4.sendto(packet, endpoint_addr),
SocketAddr::V6(_) => udp6.sendto(packet, endpoint_addr),
};
}
_ => panic!("Unexpected result from update_timers"),
};
}
Action::Continue
}),
std::time::Duration::from_millis(250),
)?;
Ok(())
}
pub(crate) fn trigger_yield(&self) {
self.queue
.trigger_notification(self.yield_notice.as_ref().unwrap())
}
pub(crate) fn trigger_exit(&self) {
self.queue
.trigger_notification(self.exit_notice.as_ref().unwrap())
}
pub(crate) fn cancel_yield(&self) {
self.queue
.stop_notification(self.yield_notice.as_ref().unwrap())
}
fn register_udp_handler(&self, udp: Arc<UDPSocket>) -> Result<(), Error> {
self.queue.new_event(
udp.as_raw_fd(),
Box::new(move |d, t| {
// Handler that handles anonymous packets over UDP
let mut iter = MAX_ITR;
let (private_key, public_key) = d.key_pair.as_ref().expect("Key not set");
let rate_limiter = d.rate_limiter.as_ref().unwrap();
// Loop while we have packets on the anonymous connection
while let Ok((addr, packet)) = udp.recvfrom(&mut t.src_buf[..]) {
// The rate limiter initially checks mac1 and mac2, and optionally asks to send a cookie
let parsed_packet =
match rate_limiter.verify_packet(Some(addr.ip()), packet, &mut t.dst_buf) {
Ok(packet) => packet,
Err(TunnResult::WriteToNetwork(cookie)) => {
udp.sendto(cookie, addr);
continue;
}
Err(_) => continue,
};
let peer = match &parsed_packet {
Packet::HandshakeInit(p) => {
parse_handshake_anon(&private_key, &public_key, &p)
.ok()
.and_then(|hh| {
d.peers
.get(&X25519PublicKey::from(&hh.peer_static_public[..]))
})
}
Packet::HandshakeResponse(p) => d.peers_by_idx.get(&(p.receiver_idx >> 8)),
Packet::PacketCookieReply(p) => d.peers_by_idx.get(&(p.receiver_idx >> 8)),
Packet::PacketData(p) => d.peers_by_idx.get(&(p.receiver_idx >> 8)),
};
let peer = match peer {
None => continue,
Some(peer) => peer,
};
// We found a peer, use it to decapsulate the message+
let mut flush = false; // Are there packets to send from the queue?
match peer
.tunnel
.handle_verified_packet(parsed_packet, &mut t.dst_buf[..])
{
TunnResult::Done => {}
TunnResult::Err(_) => continue,
TunnResult::WriteToNetwork(packet) => {
flush = true;
udp.sendto(packet, addr);
}
TunnResult::WriteToTunnelV4(packet, addr) => {
if peer.is_allowed_ip(addr) {
t.iface.write4(packet);
}
}
TunnResult::WriteToTunnelV6(packet, addr) => {
if peer.is_allowed_ip(addr) {
t.iface.write6(packet);
}
}
};
if flush {
// Flush pending queue
while let TunnResult::WriteToNetwork(packet) =
peer.tunnel.decapsulate(None, &[], &mut t.dst_buf[..])
{
udp.sendto(packet, addr);
}
}
// This packet was OK, that means we want to create a connected socket for this peer
let ip_addr = addr.ip();
peer.set_endpoint(addr);
if d.config.use_connected_socket {
if let Ok(sock) = peer.connect_endpoint(d.listen_port, d.fwmark) {
d.register_conn_handler(Arc::clone(peer), sock, ip_addr)
.unwrap();
}
}
iter -= 1;
if iter == 0 {
break;
}
}
Action::Continue
}),
)?;
Ok(())
}
fn register_conn_handler(
&self,
peer: Arc<Peer>,
udp: Arc<UDPSocket>,
peer_addr: IpAddr,
) -> Result<(), Error> {
self.queue.new_event(
udp.as_raw_fd(),
Box::new(move |_, t| {
// The conn_handler handles packet received from a connected UDP socket, associated
// with a known peer, this saves us the hustle of finding the right peer. If another
// peer gets the same ip, it will be ignored until the socket does not expire.
let iface = &t.iface;
let mut iter = MAX_ITR;
while let Ok(src) = udp.read(&mut t.src_buf[..]) {
let mut flush = false;
match peer
.tunnel
.decapsulate(Some(peer_addr), src, &mut t.dst_buf[..])
{
TunnResult::Done => {}
TunnResult::Err(e) => eprintln!("Decapsulate error {:?}", e),
TunnResult::WriteToNetwork(packet) => {
flush = true;
udp.write(packet);
}
TunnResult::WriteToTunnelV4(packet, addr) => {
if peer.is_allowed_ip(addr) {
iface.write4(packet);
}
}
TunnResult::WriteToTunnelV6(packet, addr) => {
if peer.is_allowed_ip(addr) {
iface.write6(packet);
}
}
};
if flush {
// Flush pending queue
while let TunnResult::WriteToNetwork(packet) =
peer.tunnel.decapsulate(None, &[], &mut t.dst_buf[..])
{
udp.write(packet);
}
}
iter -= 1;
if iter == 0 {
break;
}
}
Action::Continue
}),
)?;
Ok(())
}
fn register_iface_handler(&self, iface: Arc<TunSocket>) -> Result<(), Error> {
self.queue.new_event(
iface.as_raw_fd(),
Box::new(move |d, t| {
// The iface_handler handles packets received from the WireGuard virtual network
// interface. The flow is as follows:
// * Read a packet
// * Determine peer based on packet destination ip
// * Encapsulate the packet for the given peer
// * Send encapsulated packet to the peer's endpoint
let mtu = d.mtu.load(Ordering::Relaxed);
let udp4 = d.udp4.as_ref().expect("Not connected");
let udp6 = d.udp6.as_ref().expect("Not connected");
let peers = &d.peers_by_ip;
for _ in 0..MAX_ITR {
let src = match iface.read(&mut t.src_buf[..mtu]) {
Ok(src) => src,
Err(Error::IfaceRead(errno)) => {
let ek = io::Error::from_raw_os_error(errno).kind();
if ek == io::ErrorKind::Interrupted || ek == io::ErrorKind::WouldBlock {
break;
}
eprintln!("Fatal read error on tun interface: errno {:?}", errno);
return Action::Exit;
}
Err(e) => {
eprintln!("Unexpected error on tun interface: {:?}", e);
return Action::Exit;
}
};
let dst_addr = match Tunn::dst_address(src) {
Some(addr) => addr,
None => continue,
};
let peer = match peers.find(dst_addr) {
Some(peer) => peer,
None => continue,
};
match peer.tunnel.encapsulate(src, &mut t.dst_buf[..]) {
TunnResult::Done => {}
TunnResult::Err(e) => error!(d.config.logger, "Encapsulate error {:?}", e),
TunnResult::WriteToNetwork(packet) => {
let endpoint = peer.endpoint();
if let Some(ref conn) = endpoint.conn {
// Prefer to send using the connected socket
conn.write(packet);
} else if let Some(addr @ SocketAddr::V4(_)) = endpoint.addr {
udp4.sendto(packet, addr);
} else if let Some(addr @ SocketAddr::V6(_)) = endpoint.addr {
udp6.sendto(packet, addr);
} else {
error!(d.config.logger, "No endpoint");
}
}
_ => panic!("Unexpected result from encapsulate"),
};
}
Action::Continue
}),
)?;
Ok(())
}
}