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Lonami Exo 2018-05-24 12:34:45 +02:00
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Cargo.toml Normal file
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@ -0,0 +1,14 @@
[package]
name = "mtproxy"
version = "0.1.0"
authors = ["Lonami Exo <totufals@hotmail.com>"]
[dependencies]
tokio = "0.1.6"
rand = "0.4"
openssl = "0.10.7"
[dependencies.byteorder]
version = "1.2.3"
features = ["i128"]

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src/main.rs Normal file
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extern crate rand;
extern crate tokio;
extern crate openssl;
extern crate byteorder;
use std::net::{IpAddr, Ipv4Addr, SocketAddr};
use rand::{thread_rng, Rng};
use tokio::io;
use tokio::prelude::*;
use tokio::net::{TcpListener, TcpStream};
use openssl::sha::sha256;
use openssl::symm::{encrypt, decrypt, Cipher};
use byteorder::{LittleEndian, BigEndian, ReadBytesExt, WriteBytesExt};
// const fn has not been stabilished yet
// static + custom From is the closest we can get
#[derive(Debug, Clone, Copy)]
struct IpAddress(u8, u8, u8, u8);
impl From<IpAddress> for IpAddr {
fn from(addr: IpAddress) -> Self {
IpAddr::V4(Ipv4Addr::new(addr.0, addr.1, addr.2, addr.3))
}
}
const DC_IPS: [IpAddress; 5] = [
IpAddress(149, 154, 175, 50),
IpAddress(149, 154, 167, 51),
IpAddress(149, 154, 175, 100),
IpAddress(149, 154, 167, 91),
IpAddress(149, 154, 171, 5),
];
struct MTProtoPacket {
encrypt_key: Vec<u8>,
encrypt_iv: Vec<u8>,
decrypt_key: Vec<u8>,
decrypt_iv: Vec<u8>,
encrypt_counter: Option<Vec<u8>>,
decrypt_counter: Option<Vec<u8>>,
//encrypt_count_buf: Vec<u8>
//encrypt_num: u32,
//decrypt_count_buf: Vec<u8>,
//decrypt_buf: u32,
}
impl MTProtoPacket {
fn new(buffer: &Vec<u8>, rev: &Vec<u8>,
key: &Vec<u8>, key_rev: &Vec<u8>) -> MTProtoPacket {
// This is verified
MTProtoPacket {
encrypt_key: key_rev.clone(),
encrypt_iv: rev[32..48].to_vec(),
decrypt_key: key.clone(),
decrypt_iv: buffer[40..56].to_vec(),
encrypt_counter: None,
decrypt_counter: None
}
}
/// Initializes a new obfuscated2 buffer
fn new_obf2_buffer() -> (MTProtoPacket, [u8; 64]) {
let mut buffer = [0u8; 64];
let mut rng = thread_rng();
loop {
rng.fill_bytes(&mut buffer);
let val = (&buffer[0..4]).read_u32::<LittleEndian>().unwrap();
let val2 = (&buffer[4..8]).read_u32::<LittleEndian>().unwrap();
if buffer[0] != 0xef
&& val != 0x44414548
&& val != 0x54534f50
&& val != 0x20544547
&& val != 0x4954504f
&& val != 0xeeeeeeee
&& val2 != 0x00000000
{
buffer[56] = 0xef;
buffer[57] = 0xef;
buffer[58] = 0xef;
buffer[59] = 0xef;
break;
}
}
let encrypt_key;
let encrypt_iv;
let decrypt_key;
let decrypt_iv;
{
let key_iv_encrypt: &[u8] = &buffer[8..56];
encrypt_key = key_iv_encrypt[0..32].to_vec();
encrypt_iv = key_iv_encrypt[32..48].to_vec();
let key_iv_encrypt: Vec<u8> = key_iv_encrypt.iter().rev().cloned().collect();
decrypt_key = key_iv_encrypt[0..32].to_vec();
decrypt_iv = key_iv_encrypt[32..48].to_vec();
}
let mut packet = MTProtoPacket {
encrypt_key, encrypt_iv,
decrypt_key, decrypt_iv,
encrypt_counter: None,
decrypt_counter: None
};
let encrypted_buffer = packet.encrypt_obf2(&buffer);
for i in 56..encrypted_buffer.len() {
buffer[i] = encrypted_buffer[i];
}
(packet, buffer)
}
fn encrypt_obf2(&mut self, data: &[u8]) -> Vec<u8> {
//if self.encrypt_counter.is_none() {
// self.encrypt_counter = Some(self.encrypt_iv.cloned());
//}
let mut out = vec![0u8; data.len()];
let cipher = Cipher::aes_256_ctr();
encrypt(cipher, &self.encrypt_key, Some(&self.encrypt_iv), &data).unwrap()
}
fn decrypt_obf2(&mut self, data: &[u8]) -> Vec<u8> {
//if self.decrypt_counter.is_none() {
// self.decrypt_counter = Some(self.decrypt_iv.cloned());
//}
let mut out = vec![0u8; data.len()];
let cipher = Cipher::aes_256_ctr();
decrypt(cipher, &self.decrypt_key, Some(&self.decrypt_iv), &data).unwrap()
}
fn create_packet_obf2(&mut self, payload: &[u8]) -> Vec<u8> {
// TODO lock?
let payload = self.create_packet_abridged(&payload);
self.encrypt_obf2(&payload);
}
fn create_packet_abridged(&self, payload: &[u8]) -> Vec<u8> {
let length = payload.len() / 4;
let mut bytes = Vec::new();
if length < 0x7f {
bytes.push(length as u8);
} else {
bytes.push(0x7f);
bytes.write_u32::<LittleEndian>(length as u32).unwrap();
bytes.remove(1);
}
bytes.extend(payload);
bytes
}
fn send_init_buffer_obf2() {
// TODO wtf
}
// this is GetPacketBytesAsync
fn read(&mut self, socket: TcpStream) {
let connection = io::read_exact(socket, [0u8; 1])
.and_then(|(socket, buf)| {
let len = self.decrypt_obf2(&buf)[0];
if len < 0x7f {
Ok((socket, len * 4))
} else {
io::read_exact(socket, [0u8; 3])
.and_then(|socket, buf|) {
let mut len_bytes = self.decrypt_obf2(&buf);
len_bytes.insert(0, 0);
Ok((socket, len_bytes.read_i32::<LittleEndian>().unwrap()))
}
}
Ok(io::read_exact(socket, [0u8; 3]))
});
}
}
struct MTProtoProxyServer {
secret: u128,
port: u16
}
fn to_bytes(n: u128) -> Vec<u8> {
let mut vec = vec![];
vec.write_u128::<BigEndian>(n).unwrap();
vec
}
impl MTProtoProxyServer {
fn new(secret: u128, port: u16) -> MTProtoProxyServer {
MTProtoProxyServer { secret, port }
}
fn run(&self) {
let addr = format!("192.168.1.104:{}", self.port).parse().unwrap();
let listener = TcpListener::bind(&addr).expect("bind fail");
let secret = self.secret;
let server = listener.incoming().for_each(move |socket| {
println!("got socket at {:?}", socket.peer_addr().unwrap());
let mut random_buffer = vec![0u8; 64];
let connection = io::read_exact(socket, random_buffer)
.and_then(move |(socket, mut buf)| {
let rev: Vec<u8> = buf[8..56].iter().rev().cloned().collect();
let key: Vec<u8> = buf[8..40].to_vec();
let key_rev: Vec<u8> = rev[0..32].to_vec();
let bin_secret: Vec<u8> = to_bytes(secret);
let mut key = key.to_vec();
key.extend(&bin_secret);
let key = sha256(&key);
let mut key_rev = key_rev.to_vec();
key_rev.extend(&bin_secret);
let key_rev = sha256(&key_rev);
let mut mtproto_packet_sv = MTProtoPacket::new(
&buf, &rev, &key.to_vec(), &key_rev.to_vec()
);
let decrypt_buf = &mtproto_packet_sv.decrypt_obf2(&buf)[56..64];
for i in 56..64 {
buf[i] = decrypt_buf[i - 56];
}
for byte in &buf[56..60] {
if *byte != 0xefu8 {
eprintln!("error in buffer");
// TODO return Err
}
}
let dc_id = (&buf[60..62]).read_i16::<LittleEndian>().unwrap().abs();
let ip = DC_IPS[(dc_id - 1) as usize];
println!("connecting to dc {}: {:?}", dc_id, ip);
// ALL ABOVE VERIFIED UP TO HERE
let socket_cl = TcpStream::connect(&SocketAddr::new(From::from(ip), 443));
let (mtproto_packet_cl, buffer) =
MTProtoPacket::new_obf2_buffer();
// TODO Actually don't but yeah testing!
return io::write_all(socket, buf);
})
.then(|_| {
Ok(())
});
tokio::spawn(connection);
Ok(())
})
.map_err(|err| {
eprintln!("acept error: {:?}", err);
});
println!("server running at {:?}", addr);
tokio::run(server);
}
}
fn main() {
let server = MTProtoProxyServer::new(1837, 1837);
println!("ok running...");
server.run()
}