2022-11-15 19:11:16 -05:00
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use std::{
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convert::Infallible,
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net::SocketAddr,
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sync::{Arc, Mutex},
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};
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use hyper::{
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body,
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body::Bytes,
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header::HeaderValue,
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server::conn::AddrStream,
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service::{make_service_fn, service_fn},
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Body, Method, Request, Response, Server, StatusCode,
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};
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2023-01-25 15:23:28 -05:00
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use lox::bridge_table::BridgeLine;
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use lox::proto;
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use lox::{BridgeAuth, BridgeDb, OPENINV_LENGTH};
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use rand::RngCore;
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use serde::{Deserialize, Serialize};
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use serde_json;
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use serde_with::serde_as;
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#[serde_as]
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#[derive(Serialize, Deserialize)]
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pub struct Invite {
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#[serde_as(as = "[_; OPENINV_LENGTH]")]
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invite: [u8; OPENINV_LENGTH],
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}
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/// Create a random BridgeLine for testing ONLY. Do not use in production!
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/// This was copied directly from lox/src/bridge_table.rs in order
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/// to easily initialize a bridgedb/lox_auth with structurally
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/// correct buckets to be used for Lox requests/verifications/responses.
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/// In production, existing bridges should be translated into this format
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/// in a private function and sorted into buckets (3 bridges/bucket is suggested
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/// but experience may suggest something else) in some intelligent way.
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pub fn random() -> BridgeLine {
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let mut rng = rand::thread_rng();
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let mut res: BridgeLine = BridgeLine::default();
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// Pick a random 4-byte address
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let mut addr: [u8; 4] = [0; 4];
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rng.fill_bytes(&mut addr);
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// If the leading byte is 224 or more, that's not a valid IPv4
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// address. Choose an IPv6 address instead (but don't worry too
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// much about it being well formed).
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if addr[0] >= 224 {
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rng.fill_bytes(&mut res.addr);
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} else {
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// Store an IPv4 address as a v4-mapped IPv6 address
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res.addr[10] = 255;
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res.addr[11] = 255;
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res.addr[12..16].copy_from_slice(&addr);
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};
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let ports: [u16; 4] = [443, 4433, 8080, 43079];
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let portidx = (rng.next_u32() % 4) as usize;
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res.port = ports[portidx];
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let mut fingerprint: [u8; 20] = [0; 20];
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let mut cert: [u8; 52] = [0; 52];
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rng.fill_bytes(&mut fingerprint);
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rng.fill_bytes(&mut cert);
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let infostr: String = format!(
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"obfs4 {} cert={} iat-mode=0",
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hex_fmt::HexFmt(fingerprint),
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base64::encode_config(cert, base64::STANDARD_NO_PAD)
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);
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res.info[..infostr.len()].copy_from_slice(infostr.as_bytes());
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res
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}
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#[derive(Clone)]
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struct LoxServerContext {
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db: Arc<Mutex<BridgeDb>>,
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ba: Arc<Mutex<BridgeAuth>>,
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}
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async fn handle(
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context: LoxServerContext,
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// addr: SocketAddr,
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req: Request<Body>,
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) -> Result<Response<Body>, Infallible> {
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println!("Request: {:?}", req);
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match req.method() {
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&Method::OPTIONS => Ok(Response::builder()
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.header("Access-Control-Allow-Origin", HeaderValue::from_static("*"))
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.header("Access-Control-Allow-Headers", "accept, content-type")
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.header("Access-Control-Allow-Methods", "POST")
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.status(200)
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.body(Body::from("Allow POST"))
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.unwrap()),
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_ => match (req.method(), req.uri().path()) {
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(&Method::GET, "/invite") => Ok::<_, Infallible>(generate_invite(context.db)),
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(&Method::GET, "/reachability") => Ok::<_, Infallible>(send_reachability_cred(context.ba)),
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(&Method::GET, "/pubkeys") => Ok::<_, Infallible>(send_keys(context.ba)),
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(&Method::POST, "/openreq") => Ok::<_, Infallible>({
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let bytes = body::to_bytes(req.into_body()).await.unwrap();
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verify_and_send_open_cred(bytes, context.ba)
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}),
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(&Method::POST, "/trustpromo") => Ok::<_, Infallible>({
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let bytes = body::to_bytes(req.into_body()).await.unwrap();
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verify_and_send_trust_promo(bytes, context.ba)
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}),
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_ => {
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// Return 404 not found response.
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Ok(Response::builder()
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.status(StatusCode::NOT_FOUND)
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.body(Body::from("Not found"))
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.unwrap())
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}
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},
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}
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}
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fn generate_invite(db: Arc<Mutex<lox::BridgeDb>>) -> Response<Body> {
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let obj = db.lock().unwrap();
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let invite = Invite {
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invite: obj.invite(),
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};
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let token = serde_json::to_string(&invite).unwrap();
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let mut resp = Response::new(Body::from(token));
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resp.headers_mut()
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.insert("Access-Control-Allow-Origin", HeaderValue::from_static("*"));
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resp
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}
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fn send_reachability_cred(ba: Arc<Mutex<BridgeAuth>>) -> Response<Body> {
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let ba_obj = ba.lock().unwrap();
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let mut resp = Response::new(Body::from(serde_json::to_string(&ba_obj.reachability_pub).unwrap()));
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resp.headers_mut().insert("Access-Control-Allow-Origin", HeaderValue::from_static("*"));
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resp
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}
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fn send_keys(ba: Arc<Mutex<BridgeAuth>>) -> Response<Body> {
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let ba_obj = ba.lock().unwrap();
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// vector of public keys (to serialize)
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let ba_obj_pubkeys = vec![
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&ba_obj.lox_pub,
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&ba_obj.migration_pub,
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&ba_obj.migrationkey_pub,
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&ba_obj.reachability_pub,
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&ba_obj.invitation_pub,
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];
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println!("Today's date according to server: {}", ba_obj.today());
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let mut resp = Response::new(Body::from(serde_json::to_string(&ba_obj_pubkeys).unwrap()));
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resp.headers_mut()
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.insert("Access-Control-Allow-Origin", HeaderValue::from_static("*"));
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resp
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}
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fn verify_and_send_open_cred(request: Bytes, ba: Arc<Mutex<BridgeAuth>>) -> Response<Body> {
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let req: proto::open_invite::Request = serde_json::from_slice(&request).unwrap();
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let mut ba_obj = ba.lock().unwrap();
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let response = ba_obj.handle_open_invite(req).unwrap();
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let open_invite_resp_str = serde_json::to_string(&response).unwrap();
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let mut resp = Response::new(Body::from(open_invite_resp_str));
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resp.headers_mut()
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.insert("Access-Control-Allow-Origin", HeaderValue::from_static("*"));
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resp
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}
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fn verify_and_send_trust_promo(request: Bytes, ba: Arc<Mutex<BridgeAuth>>) -> Response<Body> {
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let req: proto::trust_promotion::Request = serde_json::from_slice(&request).unwrap();
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let mut ba_obj = ba.lock().unwrap();
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ba_obj.advance_days(31);
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println!("Today's date according to server: {}", ba_obj.today());
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let response = ba_obj.handle_trust_promotion(req).unwrap();
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let trust_promo_resp_str = serde_json::to_string(&response).unwrap();
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let mut resp = Response::new(Body::from(trust_promo_resp_str));
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resp.headers_mut()
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.insert("Access-Control-Allow-Origin", HeaderValue::from_static("*"));
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resp
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}
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async fn shutdown_signal() {
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tokio::signal::ctrl_c()
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.await
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.expect("failed to listen for ctrl+c signal");
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}
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#[tokio::main]
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async fn main() {
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let num_buckets = 5;
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// Create and initialize a new db and lox_auth
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let mut bridgedb = BridgeDb::new();
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let mut lox_auth = BridgeAuth::new(bridgedb.pubkey);
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// Make 3 x num_buckets open invitation bridges, in sets of 3
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for _ in 0..num_buckets {
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let bucket = [random(), random(), random()];
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lox_auth.add_openinv_bridges(bucket, &mut bridgedb);
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}
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// Create the encrypted bridge table
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lox_auth.enc_bridge_table();
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let context = LoxServerContext {
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db: Arc::new(Mutex::new(bridgedb)),
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ba: Arc::new(Mutex::new(lox_auth)),
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};
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let new_service = make_service_fn(move |_conn: &AddrStream| {
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let context = context.clone();
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let service = service_fn(move |req| {
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// let addr = conn.remote_addr();
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handle(context.clone(), req)
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});
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async move { Ok::<_, Infallible>(service) }
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});
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let addr = SocketAddr::from(([127, 0, 0, 1], 8001));
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let server = Server::bind(&addr).serve(new_service);
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let graceful = server.with_graceful_shutdown(shutdown_signal());
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println!("Listening on {}", addr);
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if let Err(e) = graceful.await {
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eprintln!("server error: {}", e);
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}
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}
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