use std::{ convert::Infallible, net::SocketAddr, sync::{Arc, Mutex}, }; use hyper::{ header::HeaderValue, service::{make_service_fn, service_fn}, Body, Request, Response, Server, }; use rand::RngCore; use serde::{Deserialize, Serialize}; use serde_json; use serde_with::serde_as; use lox::bridge_table::BridgeLine; use lox::{BridgeAuth, BridgeDb, OPENINV_LENGTH}; #[serde_as] #[derive(Serialize, Deserialize)] pub struct Invite { #[serde_as(as = "[_; OPENINV_LENGTH]")] invite: [u8; OPENINV_LENGTH], } /// Create a random BridgeLine for testing ONLY. Do not use in production! /// This was copied directly from lox/src/bridge_table.rs in order /// to easily initialize a bridgedb/bridgeauth with structurally /// correct buckets to be used for Lox requests/verifications/responses. /// In production, existing bridges should be translated into this format /// in a private function and sorted into buckets (3 bridges/bucket is suggested /// but experience may suggest something else) in some intelligent way. pub fn random() -> BridgeLine { let mut rng = rand::thread_rng(); let mut res: BridgeLine = BridgeLine::default(); // Pick a random 4-byte address let mut addr: [u8; 4] = [0; 4]; rng.fill_bytes(&mut addr); // If the leading byte is 224 or more, that's not a valid IPv4 // address. Choose an IPv6 address instead (but don't worry too // much about it being well formed). if addr[0] >= 224 { rng.fill_bytes(&mut res.addr); } else { // Store an IPv4 address as a v4-mapped IPv6 address res.addr[10] = 255; res.addr[11] = 255; res.addr[12..16].copy_from_slice(&addr); }; let ports: [u16; 4] = [443, 4433, 8080, 43079]; let portidx = (rng.next_u32() % 4) as usize; res.port = ports[portidx]; let mut fingerprint: [u8; 20] = [0; 20]; let mut cert: [u8; 52] = [0; 52]; rng.fill_bytes(&mut fingerprint); rng.fill_bytes(&mut cert); let infostr: String = format!( "obfs4 {} cert={} iat-mode=0", hex_fmt::HexFmt(fingerprint), base64::encode_config(cert, base64::STANDARD_NO_PAD) ); res.info[..infostr.len()].copy_from_slice(infostr.as_bytes()); res } #[tokio::main] async fn main() { let num_buckets = 5; // Create and initialize a new db and bridgeauth let mut bridgedb = BridgeDb::new(); let mut bridgeauth = BridgeAuth::new(bridgedb.pubkey); // Make 3 x num_buckets open invitation bridges, in sets of 3 for _ in 0..num_buckets { let bucket = [ random(), random(), random(), ]; bridgeauth.add_openinv_bridges(bucket, &mut bridgedb); } // Create the encrypted bridge table bridgeauth.enc_bridge_table(); let db = Arc::new(Mutex::new(bridgedb)); let new_service = make_service_fn(move |_conn| { let db = db.clone(); async move { Ok::<_, Infallible>(service_fn(move |_req: Request| { let db = db.clone(); async move { Ok::<_, Infallible>(generate_invite(db)) } })) } }); let addr = SocketAddr::from(([127, 0, 0, 1], 8001)); let server = Server::bind(&addr).serve(new_service); let graceful = server.with_graceful_shutdown(shutdown_signal()); println!("Listening on {}", addr); if let Err(e) = graceful.await { eprintln!("server error: {}", e); } } async fn shutdown_signal() { tokio::signal::ctrl_c() .await .expect("failed to listen for ctrl+c signal"); } fn generate_invite(db: Arc>) -> Response { let obj = db.lock().unwrap(); let invite = Invite { invite: obj.invite(), }; let token = serde_json::to_string(&invite).unwrap(); let mut resp = Response::new(Body::from(token)); resp.headers_mut() .insert("Access-Control-Allow-Origin", HeaderValue::from_static("*")); resp }