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Keenan Tims
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||||
|
||||
[[package]]
|
||||
name = "zerocopy-derive"
|
||||
version = "0.8.17"
|
||||
source = "registry+https://github.com/rust-lang/crates.io-index"
|
||||
checksum = "06718a168365cad3d5ff0bb133aad346959a2074bd4a85c121255a11304a8626"
|
||||
dependencies = [
|
||||
"proc-macro2",
|
||||
"quote",
|
||||
"syn",
|
||||
]
|
||||
11
Cargo.toml
Normal file
11
Cargo.toml
Normal file
@@ -0,0 +1,11 @@
|
||||
[package]
|
||||
name = "tailstun"
|
||||
version = "0.1.0"
|
||||
edition = "2021"
|
||||
|
||||
[dependencies]
|
||||
clap = { version = "4.5.29", features = ["derive"] }
|
||||
crc32fast = "1.4.2"
|
||||
log = "0.4.25"
|
||||
nom = "8.0.0"
|
||||
rand = "0.9.0"
|
||||
1
README.md
Normal file
1
README.md
Normal file
@@ -0,0 +1 @@
|
||||
A trivial test client for Tailscale's derper STUN service, which doesn't respond to generic STUN requests.
|
||||
503
src/main.rs
Normal file
503
src/main.rs
Normal file
@@ -0,0 +1,503 @@
|
||||
use clap;
|
||||
use std::fmt;
|
||||
use std::net::{IpAddr, Ipv4Addr, SocketAddr, UdpSocket};
|
||||
use std::ops::Index;
|
||||
|
||||
use crc32fast::hash;
|
||||
use log::warn;
|
||||
use nom::bytes::complete::{tag, take};
|
||||
use nom::error::ParseError;
|
||||
use nom::multi::{many, many0};
|
||||
use nom::number::complete::{be_u128, be_u16, be_u32, be_u8};
|
||||
use nom::{AsBytes, IResult, Parser};
|
||||
use rand::RngCore;
|
||||
|
||||
// https://github.com/tailscale/tailscale/blob/main/net/stun/stun.go
|
||||
|
||||
const ATTR_NUM_SOFTWARE: u16 = 0x8022;
|
||||
const ATTR_NUM_FINGERPRINT: u16 = 0x8028;
|
||||
const ATTR_MAPPED_ADDRESS: u16 = 0x0001;
|
||||
const ATTR_XOR_MAPPED_ADDRESS: u16 = 0x0020;
|
||||
// This alternative attribute type is not
|
||||
// mentioned in the RFC, but the shift into
|
||||
// the "comprehension-optional" range seems
|
||||
// like an easy mistake for a server to make.
|
||||
// And servers appear to send it.
|
||||
const ATTR_XOR_MAPPED_ADDRESS_ALT: u16 = 0x8020;
|
||||
const ATTR_SOURCE_ADDRESS: u16 = 0x0004;
|
||||
const ATTR_CHANGED_ADDRESS: u16 = 0x0005;
|
||||
const ATTR_USERNAME: u16 = 0x0006;
|
||||
const ATTR_MESSAGE_INTEGRITY: u16 = 0x0008;
|
||||
const ATTR_ERROR_CODE: u16 = 0x0009;
|
||||
const ATTR_UNKNOWN_ATTRIBUTES: u16 = 0x000a;
|
||||
const ATTR_REALM: u16 = 0x0014;
|
||||
const ATTR_NONCE: u16 = 0x0015;
|
||||
const ATTR_ALTERNATE_SERVER: u16 = 0x8023;
|
||||
|
||||
const SOFTWARE: [u8; 8] = *b"tailnode";
|
||||
const BINDING_REQUEST: [u8; 2] = [0x00, 0x01];
|
||||
const MAGIC_COOKIE: [u8; 4] = [0x21, 0x12, 0xa4, 0x42];
|
||||
const LEN_FINGERPRINT: u16 = 8;
|
||||
const HEADER_LEN: u16 = 20;
|
||||
|
||||
#[derive(Debug, Clone)]
|
||||
struct TxId([u8; 12]);
|
||||
|
||||
impl TxId {
|
||||
fn new() -> Self {
|
||||
let mut tx_id = [0; 12];
|
||||
rand::rng().fill_bytes(&mut tx_id);
|
||||
Self(tx_id)
|
||||
}
|
||||
|
||||
fn from_bytes(bytes: &[u8]) -> Self {
|
||||
let mut tx_id = [0; 12];
|
||||
tx_id.copy_from_slice(bytes);
|
||||
Self(tx_id)
|
||||
}
|
||||
|
||||
fn as_bytes(&self) -> &[u8] {
|
||||
&self.0
|
||||
}
|
||||
|
||||
fn make_request(&self) -> Vec<u8> {
|
||||
const LEN_ATTR_SOFTWARE: u16 = 4 + SOFTWARE.len() as u16;
|
||||
let mut buf =
|
||||
Vec::with_capacity((HEADER_LEN + LEN_ATTR_SOFTWARE + LEN_FINGERPRINT) as usize);
|
||||
buf.extend(&BINDING_REQUEST);
|
||||
buf.extend((LEN_ATTR_SOFTWARE + LEN_FINGERPRINT).to_be_bytes());
|
||||
buf.extend(&MAGIC_COOKIE);
|
||||
buf.extend(self.as_bytes());
|
||||
buf.extend(ATTR_NUM_SOFTWARE.to_be_bytes());
|
||||
buf.extend((SOFTWARE.len() as u16).to_be_bytes());
|
||||
buf.extend(&SOFTWARE);
|
||||
|
||||
let fp = fingerprint(&buf);
|
||||
buf.extend(ATTR_NUM_FINGERPRINT.to_be_bytes());
|
||||
buf.extend((4 as u16).to_be_bytes());
|
||||
buf.extend(&fp.to_be_bytes());
|
||||
|
||||
buf
|
||||
}
|
||||
}
|
||||
|
||||
impl From<&TxId> for u128 {
|
||||
fn from(value: &TxId) -> Self {
|
||||
let mut padded = [0u8; 16];
|
||||
padded[4..].copy_from_slice(&value.0);
|
||||
u128::from_be_bytes(padded)
|
||||
}
|
||||
}
|
||||
|
||||
fn fingerprint(msg: &[u8]) -> u32 {
|
||||
hash(msg) ^ 0x5354554e
|
||||
}
|
||||
|
||||
#[derive(clap::Parser)]
|
||||
#[command(version, about, long_about = None)]
|
||||
#[command(about = "Test a Tailscale derp node's stun service")]
|
||||
struct Cli {
|
||||
host: String,
|
||||
port: Option<u16>,
|
||||
#[clap(long, short, default_value_t = false)]
|
||||
debug: bool,
|
||||
}
|
||||
|
||||
#[derive(Debug, Clone, Copy)]
|
||||
enum StunClass {
|
||||
Request = 0,
|
||||
Indication = 1,
|
||||
SuccessResponse = 2,
|
||||
ErrorResponse = 3,
|
||||
}
|
||||
|
||||
#[derive(Debug, Clone, Copy)]
|
||||
enum StunMethod {
|
||||
Binding = 1,
|
||||
}
|
||||
|
||||
#[derive(Debug, Clone)]
|
||||
enum StunAttribute {
|
||||
MappedAddress((IpAddr, u16)),
|
||||
XorMappedAddress((IpAddr, u16)),
|
||||
SourceAddress((IpAddr, u16)),
|
||||
ChangedAddress((IpAddr, u16)),
|
||||
Username(String),
|
||||
MessageIntegrity([u8; 20]),
|
||||
Fingerprint(u32),
|
||||
ErrorCode((u16, String)),
|
||||
Realm(String),
|
||||
Nonce(String),
|
||||
UnknownAttributes(Vec<u16>),
|
||||
Software(String),
|
||||
AlternateServer((IpAddr, u16)),
|
||||
Unknown((u16, Vec<u8>)),
|
||||
}
|
||||
|
||||
fn addr_family(addr: &IpAddr) -> &'static str {
|
||||
match addr {
|
||||
IpAddr::V4(_) => "IPv4",
|
||||
IpAddr::V6(_) => "IPv6",
|
||||
}
|
||||
}
|
||||
|
||||
impl fmt::Display for StunAttribute {
|
||||
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
||||
match self {
|
||||
StunAttribute::MappedAddress((addr, port)) => {
|
||||
write!(
|
||||
f,
|
||||
" MappedAddress ({}) {}:{}",
|
||||
addr_family(addr),
|
||||
addr,
|
||||
port
|
||||
)
|
||||
}
|
||||
StunAttribute::SourceAddress((addr, port)) => {
|
||||
write!(
|
||||
f,
|
||||
" SourceAddress ({}) {}:{}",
|
||||
addr_family(addr),
|
||||
addr,
|
||||
port
|
||||
)
|
||||
}
|
||||
StunAttribute::ChangedAddress((addr, port)) => {
|
||||
write!(
|
||||
f,
|
||||
" ChangedAddress ({}) {}:{}",
|
||||
addr_family(addr),
|
||||
addr,
|
||||
port
|
||||
)
|
||||
}
|
||||
StunAttribute::XorMappedAddress((addr, port)) => {
|
||||
write!(
|
||||
f,
|
||||
" XorMappedAddress ({}) {}:{}",
|
||||
addr_family(addr),
|
||||
addr,
|
||||
port
|
||||
)
|
||||
}
|
||||
StunAttribute::Username(username) => writeln!(f, " Username {}", username),
|
||||
StunAttribute::MessageIntegrity(msg_integrity) => {
|
||||
write!(f, " MessageIntegrity {:?}", msg_integrity)
|
||||
}
|
||||
StunAttribute::Fingerprint(fingerprint) => {
|
||||
write!(f, " Fingerprint 0x{:08x}", fingerprint)
|
||||
}
|
||||
StunAttribute::ErrorCode((err_num, error)) => {
|
||||
write!(f, " ErrorCode {} ({})", err_num, error)
|
||||
}
|
||||
StunAttribute::Realm(realm) => writeln!(f, " Realm {}", realm),
|
||||
StunAttribute::Nonce(nonce) => writeln!(f, " Nonce {}", nonce),
|
||||
StunAttribute::UnknownAttributes(unknown_attrs) => {
|
||||
write!(f, " UnknownAttributes {:?}", unknown_attrs)
|
||||
}
|
||||
StunAttribute::Software(software) => writeln!(f, " Software {}", software),
|
||||
StunAttribute::AlternateServer((addr, port)) => {
|
||||
write!(
|
||||
f,
|
||||
" AlternateServer ({}) {}:{}",
|
||||
addr_family(addr),
|
||||
addr,
|
||||
port
|
||||
)
|
||||
}
|
||||
StunAttribute::Unknown((attr_type, data)) => {
|
||||
write!(f, " Unknown ({}) {:?}", attr_type, data)
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Debug)]
|
||||
struct StunMessageType {
|
||||
class: StunClass,
|
||||
method: StunMethod,
|
||||
}
|
||||
|
||||
#[derive(Debug)]
|
||||
struct StunHeader {
|
||||
msg_type: StunMessageType,
|
||||
msg_length: u16,
|
||||
tx_id: TxId,
|
||||
}
|
||||
|
||||
impl fmt::Display for StunHeader {
|
||||
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
|
||||
writeln!(f, " Header")?;
|
||||
writeln!(
|
||||
f,
|
||||
" MessageType class={:?} (0x{:02x}) method={:?} (0x{:04x})",
|
||||
self.msg_type.class,
|
||||
self.msg_type.class as usize,
|
||||
self.msg_type.method,
|
||||
self.msg_type.method as usize
|
||||
)
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Debug)]
|
||||
struct StunAttributes(Vec<StunAttribute>);
|
||||
|
||||
#[derive(Debug)]
|
||||
struct StunMessage {
|
||||
h: StunHeader,
|
||||
attributes: StunAttributes,
|
||||
}
|
||||
|
||||
impl fmt::Display for StunMessage {
|
||||
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
|
||||
writeln!(f, "StunMessage")?;
|
||||
write!(f, "{}", self.h)?;
|
||||
write!(f, "{}", self.attributes)
|
||||
}
|
||||
}
|
||||
|
||||
impl fmt::Display for StunAttributes {
|
||||
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
|
||||
writeln!(f, " Attributes")?;
|
||||
for attr in &self.0 {
|
||||
writeln!(f, " {}", attr)?;
|
||||
}
|
||||
Ok(())
|
||||
}
|
||||
}
|
||||
|
||||
fn take_txid<'a, E: ParseError<&'a [u8]>>(bytes: &'a [u8]) -> IResult<&[u8], TxId, E> {
|
||||
let (bytes, tx_id) = take(12usize)(bytes)?;
|
||||
Ok((bytes, TxId::from_bytes(tx_id)))
|
||||
}
|
||||
|
||||
fn parse_stun_message<'a, E: ParseError<&'a [u8]>>(
|
||||
bytes: &'a [u8],
|
||||
) -> IResult<&'a [u8], StunMessage, E> {
|
||||
let (bytes, h) = parse_stun_header(bytes)?;
|
||||
|
||||
let (bytes, attributes) = many0(parse_stun_attribute::<&[u8], E>(&h.tx_id)).parse(bytes)?;
|
||||
let attributes = StunAttributes(attributes.iter().filter_map(|i| i.clone()).collect());
|
||||
|
||||
Ok((bytes, StunMessage { h, attributes }))
|
||||
}
|
||||
|
||||
fn parse_stun_message_type<'a, E: ParseError<&'a [u8]>>(
|
||||
bytes: &'a [u8],
|
||||
) -> IResult<&'a [u8], StunMessageType, E> {
|
||||
let (bytes, msg_type_raw) = be_u16(bytes)?;
|
||||
if msg_type_raw & 0b11000000 != 0 {
|
||||
panic!("Invalid STUN message type");
|
||||
}
|
||||
let class_raw = ((msg_type_raw & (1 << 4)) >> 4) | ((msg_type_raw & (1 << 8)) >> 7);
|
||||
let class = match class_raw {
|
||||
0 => StunClass::Request,
|
||||
1 => StunClass::Indication,
|
||||
2 => StunClass::SuccessResponse,
|
||||
3 => StunClass::ErrorResponse,
|
||||
_ => panic!("Invalid STUN message class"),
|
||||
};
|
||||
let method_raw = msg_type_raw & 0x0f | msg_type_raw & 0xe0 >> 1 | msg_type_raw & 0x3e >> 2;
|
||||
let method = match method_raw {
|
||||
1 => StunMethod::Binding,
|
||||
_ => panic!("Invalid STUN message method"),
|
||||
};
|
||||
Ok((bytes, StunMessageType { class, method }))
|
||||
}
|
||||
|
||||
fn parse_stun_address<I, E: ParseError<I>>(bytes: I) -> IResult<I, (IpAddr, u16), E>
|
||||
where
|
||||
I: nom::Input<Item = u8>,
|
||||
{
|
||||
let (bytes, _) = take(1usize)(bytes)?;
|
||||
let (bytes, family) = be_u8(bytes)?;
|
||||
let (bytes, port) = be_u16(bytes)?;
|
||||
let (bytes, addr) = match family {
|
||||
0x01 => {
|
||||
let (bytes, val) = be_u32(bytes)?;
|
||||
(bytes, (IpAddr::V4(val.into()), port))
|
||||
}
|
||||
0x02 => {
|
||||
let (bytes, val) = be_u128(bytes)?;
|
||||
(bytes, (IpAddr::V6(val.into()), port))
|
||||
}
|
||||
_ => panic!("Invalid address family"),
|
||||
};
|
||||
Ok((bytes, addr))
|
||||
}
|
||||
|
||||
fn parse_stun_xor_address<I, E: ParseError<I>>(
|
||||
bytes: I,
|
||||
tx_id: &TxId,
|
||||
) -> IResult<I, (IpAddr, u16), E>
|
||||
where
|
||||
I: nom::Input<Item = u8>,
|
||||
{
|
||||
let (bytes, addr) = parse_stun_address(bytes)?;
|
||||
let xor_port = addr.1 ^ 0x2112;
|
||||
let xor_addr = match addr.0 {
|
||||
IpAddr::V4(v4) => {
|
||||
let v4 = u32::from(v4);
|
||||
let xor_v4 = v4 ^ 0x2112a442;
|
||||
IpAddr::V4(xor_v4.into())
|
||||
}
|
||||
IpAddr::V6(v6) => {
|
||||
let v6 = u128::from(v6);
|
||||
let xor_v6: u128 = v6 ^ (0x2112a442 << 96 | u128::from(tx_id));
|
||||
IpAddr::V6(xor_v6.into())
|
||||
}
|
||||
};
|
||||
Ok((bytes, (xor_addr, xor_port)))
|
||||
}
|
||||
|
||||
fn parse_stun_attribute<I, E: ParseError<I>>(
|
||||
tx_id: &TxId,
|
||||
) -> impl Fn(I) -> IResult<I, Option<StunAttribute>, E>
|
||||
where
|
||||
I: nom::Input<Item = u8> + nom::Compare<I> + AsBytes,
|
||||
{
|
||||
let tx_id = tx_id.clone();
|
||||
move |bytes| parse_stun_attribute_impl(bytes, &tx_id)
|
||||
}
|
||||
|
||||
fn parse_stun_attribute_impl<I, E: ParseError<I>>(
|
||||
bytes: I,
|
||||
tx_id: &TxId,
|
||||
) -> IResult<I, Option<StunAttribute>, E>
|
||||
where
|
||||
I: nom::Input<Item = u8> + nom::Compare<I> + AsBytes,
|
||||
{
|
||||
let (bytes, attr_type) = be_u16(bytes)?;
|
||||
let (bytes, attr_len) = be_u16(bytes)?;
|
||||
let (bytes, attr_data) = take(attr_len)(bytes)?;
|
||||
|
||||
if attr_len == 0 {
|
||||
return Ok((bytes, None));
|
||||
}
|
||||
|
||||
let attr = match attr_type {
|
||||
ATTR_MAPPED_ADDRESS => {
|
||||
let (_residual, addr) = parse_stun_address(attr_data)?;
|
||||
StunAttribute::MappedAddress(addr)
|
||||
}
|
||||
ATTR_SOURCE_ADDRESS => {
|
||||
let (_residual, addr) = parse_stun_address(attr_data)?;
|
||||
StunAttribute::SourceAddress(addr)
|
||||
}
|
||||
ATTR_CHANGED_ADDRESS => {
|
||||
let (_residual, addr) = parse_stun_address(attr_data)?;
|
||||
StunAttribute::ChangedAddress(addr)
|
||||
}
|
||||
ATTR_XOR_MAPPED_ADDRESS | ATTR_XOR_MAPPED_ADDRESS_ALT => {
|
||||
let (_residual, addr) = parse_stun_xor_address(attr_data, tx_id)?;
|
||||
|
||||
StunAttribute::XorMappedAddress(addr)
|
||||
}
|
||||
ATTR_USERNAME => {
|
||||
let username = String::from_iter(attr_data.iter_elements().map(|b| b as char));
|
||||
StunAttribute::Username(username)
|
||||
}
|
||||
ATTR_MESSAGE_INTEGRITY => {
|
||||
let mut msg_integrity = [0u8; 20];
|
||||
msg_integrity.copy_from_slice(attr_data.as_bytes());
|
||||
StunAttribute::MessageIntegrity(msg_integrity)
|
||||
}
|
||||
ATTR_ERROR_CODE => {
|
||||
let (attr_data, zeros) = take(2usize)(attr_data)?;
|
||||
if zeros.iter_elements().any(|b| b != 0) {
|
||||
panic!("Invalid STUN error code");
|
||||
}
|
||||
let (attr_data, err_num) = be_u16(attr_data)?;
|
||||
if err_num & 0b1111100000000000 != 0 {
|
||||
panic!("Invalid STUN error code");
|
||||
}
|
||||
let error = String::from_iter(attr_data.iter_elements().map(|b| b as char));
|
||||
StunAttribute::ErrorCode((err_num, error))
|
||||
}
|
||||
ATTR_UNKNOWN_ATTRIBUTES => {
|
||||
let (_residual, unknown_attrs) =
|
||||
many((attr_len / 2) as usize, be_u16).parse(attr_data)?;
|
||||
StunAttribute::UnknownAttributes(unknown_attrs)
|
||||
}
|
||||
ATTR_NUM_FINGERPRINT => {
|
||||
let (_residual, fingerprint) = be_u32(attr_data)?;
|
||||
StunAttribute::Fingerprint(fingerprint)
|
||||
}
|
||||
ATTR_REALM => {
|
||||
let realm = String::from_iter(attr_data.iter_elements().map(|b| b as char));
|
||||
StunAttribute::Realm(realm)
|
||||
}
|
||||
ATTR_NONCE => {
|
||||
let nonce = String::from_iter(attr_data.iter_elements().map(|b| b as char));
|
||||
StunAttribute::Nonce(nonce)
|
||||
}
|
||||
ATTR_NUM_SOFTWARE => {
|
||||
let software = String::from_iter(attr_data.iter_elements().map(|b| b as char));
|
||||
StunAttribute::Software(software)
|
||||
}
|
||||
ATTR_ALTERNATE_SERVER => {
|
||||
let (_residual, addr) = parse_stun_address(attr_data)?;
|
||||
StunAttribute::AlternateServer(addr)
|
||||
}
|
||||
|
||||
t => {
|
||||
warn!("Unknown STUN attribute type {t}");
|
||||
StunAttribute::Unknown((t, attr_data.iter_elements().collect()))
|
||||
}
|
||||
};
|
||||
|
||||
Ok((bytes, Some(attr)))
|
||||
}
|
||||
|
||||
fn parse_stun_header<'a, E: ParseError<&'a [u8]>>(
|
||||
bytes: &'a [u8],
|
||||
) -> IResult<&'a [u8], StunHeader, E> {
|
||||
let (bytes, msg_type) = parse_stun_message_type(bytes)?;
|
||||
let (bytes, msg_length) = be_u16(bytes)?;
|
||||
let (bytes, _) = tag(MAGIC_COOKIE.as_slice())(bytes)?;
|
||||
let (bytes, tx_id) = take_txid(bytes)?;
|
||||
Ok((
|
||||
bytes,
|
||||
StunHeader {
|
||||
msg_type,
|
||||
msg_length,
|
||||
tx_id,
|
||||
},
|
||||
))
|
||||
}
|
||||
|
||||
fn main() {
|
||||
let cli = <Cli as clap::Parser>::parse();
|
||||
|
||||
let dest = cli.host + ":" + &cli.port.unwrap_or(3478).to_string();
|
||||
let socket = UdpSocket::bind("[::]:0").expect("Unable to bind a UDP socket");
|
||||
socket
|
||||
.connect(dest)
|
||||
.expect("Unable to connect to the destination");
|
||||
if cli.debug {
|
||||
println!(
|
||||
"Connected to {:?} from {:?}",
|
||||
socket.peer_addr(),
|
||||
socket.local_addr()
|
||||
);
|
||||
}
|
||||
|
||||
let req = TxId::new().make_request();
|
||||
if cli.debug {
|
||||
println!("Sending request {:?}", &req);
|
||||
}
|
||||
socket.send(&req).expect("Unable to send request");
|
||||
|
||||
let mut buf = [0u8; 1500];
|
||||
|
||||
if let Ok(received) = socket.recv(&mut buf) {
|
||||
if cli.debug {
|
||||
println!("Received response: {:?}", &buf[..received]);
|
||||
}
|
||||
let (_residual, msg) = parse_stun_message::<nom::error::Error<&[u8]>>(&buf).unwrap();
|
||||
println!("Parsed message from {}:", socket.peer_addr().unwrap());
|
||||
println!("{}", msg);
|
||||
} else if let Err(e) = socket.recv(&mut buf) {
|
||||
println!("recv function failed: {e:?}");
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user