web: tokio::sync::mpsc::Sender<WebRequest>,
}
+/// Sent from hyper worker pool task to client task
+#[allow(dead_code)] // xxx
struct WebRequest {
- reply: tokio::sync::oneshot::Sender<()>,
+ // initial part of body
+ // used up to and including first 2 lines of metadata
+ // end delimiter for the metadata not yet located, but in here somewhere
+ initial: Box<[u8]>,
+ initial_remaining: usize,
+ body: hyper::body::Body,
+ reply_to: tokio::sync::oneshot::Sender<WebResponse>,
+ warnings: Warnings,
}
+/// Reply from client task to hyper worker pool task
+#[allow(dead_code)] // xxx
+struct WebResponse {
+ warnings: Warnings,
+ data: Result<WebResponseData, AE>,
+}
+
+type WebResponseData = ();
+
async fn handle(
-
_all_clients: Arc<AllClients>,
+ all_clients: Arc<AllClients>,
req: hyper::Request<hyper::Body>
) -> Result<hyper::Response<hyper::Body>, Void> {
if req.method() == Method::GET {
match async {
+ let get_header = |hn: &str| {
+ let mut values = req.headers().get_all(hn).iter();
+ let v = values.next().ok_or_else(|| anyhow!("missing {}", hn))?;
+ if values.next().is_some() { throw!(anyhow!("multiple {}!", hn)); }
+ let v = v.to_str().context(anyhow!("interpret {} as UTF-8", hn))?;
+ Ok::<_,AE>(v)
+ };
+
let mkboundary = |b: &'_ _| format!("\n--{}", b).into_bytes();
let boundary = match (||{
- let mut ctypes = req.headers().get_all("Content-Type").iter();
- let t = ctypes.next().ok_or_else(|| anyhow!("missing Content-Type"))?;
- if ctypes.next().is_some() { throw!(anyhow!("several Content-Type")) }
- let t = t.to_str().context("interpret Content-Type as utf-8")?;
+ let t = get_header("Content-Type")?;
let t: mime::Mime = t.parse().context("parse Content-Type")?;
if t.type_() != "multipart" { throw!(anyhow!("not multipart/")) }
let b = mime::BOUNDARY;
},
};
+ let length_hint: usize = (||{
+ let clength = get_header("Content-Length")?;
+ let clength = clength.parse().context("parse Content-Length")?;
+ Ok::<_,AE>(clength)
+ })().unwrap_or_else(
+ |e| { let _ = warnings.add(&e.wrap_err("parsing Content-Length")); 0 }
+ );
+
let mut body = req.into_body();
- let initial = match read_limited_bytes(METADATA_MAX_LEN, &mut body).await {
+ let initial = match read_limited_bytes(
+ METADATA_MAX_LEN, default(), length_hint, &mut body
+ ).await {
Ok(all) => all,
Err(ReadLimitedError::Truncated { sofar,.. }) => sofar,
Err(ReadLimitedError::Hyper(e)) => throw!(e),
let mut meta = MetadataFieldIterator::new(comp.payload_start);
let client: ClientName = meta.need_parse().context("client addr")?;
- let token: &str = meta.need_next().context("token")?;
-
-// let client = all_clients.get(&client).ok_or_else(|| anyhow!(BAD_CLIENT))?;
- eprintln!("boundary={:?} start={} name={:?} client={}",
- boundary, start, &comp.name, client);
+ let mut hmac_got = [0; HMAC_L];
+ let (client_time, hmac_got_l) = (||{
+ let token: &str = meta.need_next().context(r#"find in "m""#)?;
+ let (time_t, hmac_b64) = token.split_once(' ')
+ .ok_or_else(|| anyhow!("split"))?;
+ let time_t = u64::from_str_radix(time_t, 16).context("parse time_t")?;
+ let l = io::copy(
+ &mut base64::read::DecoderReader::new(&mut hmac_b64.as_bytes(),
+ BASE64_CONFIG),
+ &mut &mut hmac_got[..]
+ ).context("parse b64 token")?;
+ let l = l.try_into()?;
+ Ok::<_,AE>((time_t, l))
+ })().context("token")?;
+ let hmac_got = &hmac_got[0..hmac_got_l];
+
+ let client = all_clients.get(&client);
+
+ // We attempt to hide whether the client exists we don't try to
+ // hide the hash lookup computationgs, but we do try to hide the
+ // HMAC computation by always doing it. We hope that the compiler
+ // doesn't produce a specialised implementation for the dummy
+ // secret value.
+ let client_exists = subtle::Choice::from(client.is_some() as u8);
+ let secret = client.map(|c| c.ic.secret.0.as_bytes());
+ let secret = secret.unwrap_or(&[0x55; HMAC_B][..]);
+ let client_time_s = format!("{:x}", client_time);
+ let hmac_exp = token_hmac(secret, client_time_s.as_bytes());
+ // We also definitely want a consttime memeq for the hmac value
+ let hmac_ok = hmac_got.ct_eq(&hmac_exp);
+ //dbg!(DumpHex(&hmac_exp), client.is_some());
+ //dbg!(DumpHex(hmac_got), hmac_ok, client_exists);
+ if ! bool::from(hmac_ok & client_exists) {
+ throw!(anyhow!("xxx should be a 403 error"));
+ }
+
+ let client = client.unwrap();
+ let now = time_t_now();
+ let chk_skew = |a: u64, b: u64, c_ahead_behind| {
+ if let Some(a_ahead) = a.checked_sub(b) {
+ if a_ahead > client.ic.max_clock_skew.as_secs() {
+ throw!(anyhow!("too much clock skew (client {} by {})",
+ c_ahead_behind, a_ahead));
+ }
+ }
+ Ok::<_,AE>(())
+ };
+ chk_skew(client_time, now, "ahead")?;
+ chk_skew(now, client_time, "behind")?;
+
+ let initial_remaining = meta.remaining_bytes_len();
- Ok::<_,AE>(())
+ //eprintln!("boundary={:?} start={} name={:?} client={}",
+ // boundary, start, &comp.name, &client.ic);
+
+ let (reply_to, reply_recv) = tokio::sync::oneshot::channel();
+ let wreq = WebRequest {
+ initial,
+ initial_remaining,
+ body,
+ warnings: mem::take(&mut warnings),
+ reply_to
+ };
+ trace!("{} request", &client.ic);
+
+ client.web.try_send(wreq)
+ .map_err(|_| anyhow!("client task shut down!"))?;
+
+ let reply: WebResponse = reply_recv.await?;
+ warnings = reply.warnings;
+
+ reply.data
}.await {
Ok(()) => {
},
Ok(hyper::Response::new(hyper::Body::from("Hello World")))
}
-async fn run_client(_ic: Arc<InstanceConfig>, _web: mpsc::Receiver<WebRequest>)
+#[allow(unused_variables)] // xxx
+async fn run_client(_ic: Arc<InstanceConfig>,
+ mut web: mpsc::Receiver<WebRequest>)
-> Result<Void, AE>
{
- Err(anyhow!("xxx"))
+ struct Outstanding {
+ reply_to: tokio::sync::oneshot::Sender<WebResponse>,
+ max_requests_outstanding: u32,
+ }
+ let mut outstanding: VecDeque<Outstanding> = default();
+ let downbound: VecDeque<(/*xxx*/)> = default();
+
+ let try_send_response = |
+ reply_to: tokio::sync::oneshot::Sender<WebResponse>,
+ response: WebResponse
+ | {
+ reply_to.send(response)
+ .unwrap_or_else(|_: WebResponse| () /* oh dear */ /* xxx trace? */);
+ };
+
+ loop {
+ if let Some(ret) = {
+ if ! downbound.is_empty() {
+ outstanding.pop_front()
+ } else if let Some((i,_)) = outstanding.iter().enumerate().find({
+ |(_,o)| outstanding.len() > o.max_requests_outstanding.sat()
+ }) {
+ Some(outstanding.remove(i).unwrap())
+ } else {
+ None
+ }
+ } {
+ let response = WebResponse {
+ data: Ok(()),
+ warnings: default(),
+ };
+
+ try_send_response(ret.reply_to, response);
+ }
+
+ select!{
+ req = web.recv() =>
+ {
+ let WebRequest {
+ initial, initial_remaining, body,
+ reply_to, warnings,
+ } = req.ok_or_else(|| anyhow!("webservers all shut down!"))?;
+
+ match async {
+
+ // xxx size limit
+
+ let whole_request = body.try_fold(
+ initial.into_vec(),
+ |mut w, by| async move { w.extend_from_slice(&by); Ok(w) },
+ ).await.context("read request body")?;
+
+ dbg!(whole_request.len());
+
+/*
+
+ multipart::ComponentIterator::resume_mid_component(
+ &initial[initial_remaining..],
+ */
+
+ Ok::<_,AE>(())
+ }.await {
+ Ok(()) => outstanding.push_back(Outstanding {
+ reply_to: reply_to,
+ max_requests_outstanding: 42, // xxx
+ }),
+ Err(e) => {
+ try_send_response(reply_to, WebResponse {
+ data: Err(e),
+ warnings,
+ });
+ },
+ }
+ }
+ }
+ }
+ //Err(anyhow!("xxx"))
}
#[tokio::main]
~ian / hippotat.git / blobdiff