--- /dev/null
+// Copyright 2021 Ian Jackson and contributors to Hippotat
+// SPDX-License-Identifier: GPL-3.0-or-later
+// There is NO WARRANTY.
+
+use super::*;
+
+#[derive(Debug)]
+pub struct Client {
+ pub ic: Arc<InstanceConfig>,
+ pub web: mpsc::Sender<WebRequest>,
+ pub route: mpsc::Sender<RoutedPacket>,
+}
+
+#[allow(unused_variables)] // xxx
+#[allow(unused_mut)] // xxx
+pub async fn run(global: Arc<Global>,
+ ic: Arc<InstanceConfig>,
+ mut web: mpsc::Receiver<WebRequest>,
+ mut routed: mpsc::Receiver<RoutedPacket>)
+ -> Result<Void, AE>
+{
+ struct Outstanding {
+ reply_to: oneshot::Sender<WebResponse>,
+ oi: OutstandingInner,
+ }
+ #[derive(Debug)]
+ struct OutstandingInner {
+ target_requests_outstanding: u32,
+ }
+ let mut outstanding: VecDeque<Outstanding> = default();
+ let downbound: VecDeque<(/*xxx*/)> = default();
+
+ let try_send_response = |
+ reply_to: 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.oi.target_requests_outstanding.sat()
+ }) {
+ Some(outstanding.remove(i).unwrap())
+ } else {
+ None
+ }
+ } {
+ let response = WebResponse {
+ data: Ok(vec![ /* xxx */ ]),
+ warnings: default(),
+ };
+
+ try_send_response(ret.reply_to, response);
+ }
+
+ select!{
+ req = web.recv() =>
+ {
+ let WebRequest {
+ initial, initial_remaining, length_hint, mut body,
+ boundary_finder,
+ reply_to, conn, mut warnings,
+ } = req.ok_or_else(|| anyhow!("webservers all shut down!"))?;
+
+ match async {
+
+ let initial_used = initial.len() - initial_remaining;
+
+ let whole_request = read_limited_bytes(
+ ic.max_batch_up.sat(),
+ initial,
+ length_hint,
+ &mut body
+ ).await.context("read request body")?;
+
+ let (meta, mut comps) =
+ multipart::ComponentIterator::resume_mid_component(
+ &whole_request[initial_used..],
+ boundary_finder
+ ).context("resume parsing body, after auth checks")?;
+
+ let mut meta = MetadataFieldIterator::new(&meta);
+
+ macro_rules! meta {
+ { $v:ident, ( $( $badcmp:tt )? ), $ret:expr,
+ let $server:ident, $client:ident $($code:tt)*
+ } => {
+ let $v = (||{
+ let $server = ic.$v;
+ let $client $($code)*
+ $(
+ if $client $badcmp $server {
+ throw!(anyhow!("mismatch: client={:?} {} server={:?}",
+ $client, stringify!($badcmp), $server));
+ }
+ )?
+ Ok::<_,AE>($ret)
+ })().context(stringify!($v))?;
+ //dbg!(&$v);
+ }
+ }
+
+ meta!{
+ target_requests_outstanding, ( != ), client,
+ let server, client: u32 = meta.need_parse()?;
+ }
+
+ meta!{
+ http_timeout, ( > ), client,
+ let server, client = Duration::from_secs(meta.need_parse()?);
+ }
+
+ meta!{
+ mtu, ( != ), client,
+ let server, client: u32 = meta.parse()?.unwrap_or(server);
+ }
+
+ meta!{
+ max_batch_down, (), min(client, server),
+ let server, client: u32 = meta.parse()?.unwrap_or(server);
+ }
+
+ meta!{
+ max_batch_up, ( > ), client,
+ let server, client = meta.parse()?.unwrap_or(server);
+ }
+
+ while let Some(comp) = comps.next(&mut warnings, PartName::d)? {
+ if comp.name != PartName::d {
+ warnings.add(&format_args!("unexpected part {:?}", comp.name))?;
+ }
+ checkn(Mime2Slip, mtu, comp.payload, |header| {
+ let saddr = ip_packet_addr::<false>(header)?;
+ if saddr != ic.link.client.0 { throw!(PE::Src(saddr)) }
+ let daddr = ip_packet_addr::<true>(header)?;
+ Ok(daddr)
+ }, |(daddr,packet)| route_packet(
+ &global, &conn, &ic.link.client, daddr,packet
+ ),
+ |e| Ok::<_,SlipFramesError<_>>({ warnings.add(&e)?; })
+ ).await?;
+ }
+
+ let oi = OutstandingInner {
+ target_requests_outstanding,
+ };
+ Ok::<_,AE>(oi)
+ }.await {
+ Ok(oi) => outstanding.push_back(Outstanding { reply_to, oi }),
+ Err(e) => {
+ try_send_response(reply_to, WebResponse {
+ data: Err(e),
+ warnings,
+ });
+ },
+ }
+ }
+ }
+ }
+ //Err(anyhow!("xxx"))
+}
use hippotat::prelude::*;
+mod sclient;
+mod sweb;
+
+pub use sweb::{WebRequest, WebResponse};
+pub use sclient::Client;
+
#[derive(StructOpt,Debug)]
pub struct Opts {
#[structopt(flatten)]
- log: LogOpts,
+ pub log: LogOpts,
#[structopt(flatten)]
- config: config::Opts,
+ pub config: config::Opts,
}
-const METADATA_MAX_LEN: usize = MAX_OVERHEAD;
-const INTERNAL_QUEUE: usize = 15; // xxx: config
+pub const METADATA_MAX_LEN: usize = MAX_OVERHEAD;
+pub const INTERNAL_QUEUE: usize = 15; // xxx: config
#[derive(Debug)]
pub struct Global {
all_clients: HashMap<ClientName, Client>,
}
-#[derive(Debug)]
-pub struct Client {
- ic: Arc<InstanceConfig>,
- web: mpsc::Sender<WebRequest>,
- route: mpsc::Sender<RoutedPacket>,
-}
-
pub type RoutedPacket = Box<[u8]>; // not MIME data
-/// Sent from hyper worker pool task to client task
-#[allow(dead_code)] // xxx
-#[derive(Debug)]
-struct WebRequest {
- // 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,
- length_hint: usize,
- body: hyper::body::Body,
- boundary_finder: multipart::BoundaryFinder,
- reply_to: oneshot::Sender<WebResponse>,
- warnings: Warnings,
- conn: Arc<String>,
-}
-
-/// Reply from client task to hyper worker pool task
-#[allow(dead_code)] // xxx
-#[derive(Debug)]
-struct WebResponse {
- warnings: Warnings,
- data: Result<WebResponseData, AE>,
-}
-
-type WebResponseData = Vec<u8>;
-
#[throws(PacketError)]
pub async fn route_packet(global: &Global,
conn: &str, link: &(dyn Display + Sync),
}
}
-async fn handle(
- conn: Arc<String>,
- global: Arc<Global>,
- req: hyper::Request<hyper::Body>
-) -> Result<hyper::Response<hyper::Body>, hyper::http::Error> {
- if req.method() == Method::GET {
- let mut resp = hyper::Response::new(hyper::Body::from("hippotat\r\n"));
- resp.headers_mut().insert(
- "Content-Type",
- "text/plain; charset=US-ASCII".try_into().unwrap()
- );
- return Ok(resp)
- }
-
- let mut warnings: Warnings = default();
-
- 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 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 b = t.get_param(b).ok_or_else(|| anyhow!("missing boundary=..."))?;
- if t.subtype() != "form-data" {
- warnings.add(&"Content-Type not /form-data")?;
- }
- let b = mkboundary(b.as_str());
- Ok::<_,AE>(b)
- })() {
- Ok(y) => y,
- Err(e) => {
- warnings.add(&e.wrap_err("guessing boundary"))?;
- mkboundary("b")
- },
- };
-
- 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, default(), length_hint, &mut body
- ).await {
- Ok(all) => all,
- Err(ReadLimitedError::Truncated { sofar,.. }) => sofar,
- Err(ReadLimitedError::Hyper(e)) => throw!(e),
- };
-
- let boundary_finder = memmem::Finder::new(&boundary);
- let mut boundary_iter = boundary_finder.find_iter(&initial);
-
- let start = if initial.starts_with(&boundary[1..]) { boundary.len()-1 }
- else if let Some(start) = boundary_iter.next() { start + boundary.len() }
- else { throw!(anyhow!("initial boundary not found")) };
-
- let comp = multipart::process_boundary
- (&mut warnings, &initial[start..], PartName::m)?
- .ok_or_else(|| anyhow!(r#"no "m" component"#))?;
-
- if comp.name != PartName::m { throw!(anyhow!(
- r#"first multipart component must be name="m""#
- )) }
-
- let mut meta = MetadataFieldIterator::new(comp.payload);
-
- let client: ClientName = meta.need_parse().context("client addr")?;
-
- 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_name = client;
- let client = global.all_clients.get(&client_name);
-
- // 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) {
- debug!("{} rejected client {}", &conn, &client_name);
- let body = hyper::Body::from("Not authorised\r\n");
- return Ok(
- hyper::Response::builder()
- .status(hyper::StatusCode::FORBIDDEN)
- .header("Content-Type", r#"text/plain; charset="utf-8""#)
- .body(body)
- )
- }
-
- 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();
-
- //eprintln!("boundary={:?} start={} name={:?} client={}",
- // boundary, start, &comp.name, &client.ic);
-
- let (reply_to, reply_recv) = oneshot::channel();
- trace!("{} {} request, Content-Length={}",
- &conn, &client_name, length_hint);
- let wreq = WebRequest {
- initial,
- initial_remaining,
- length_hint,
- boundary_finder: boundary_finder.into_owned(),
- body,
- warnings: mem::take(&mut warnings),
- reply_to,
- conn: conn.clone(),
- };
-
- client.web.try_send(wreq)
- .map_err(|_| anyhow!("client task shut down!"))?;
-
- let reply: WebResponse = reply_recv.await?;
- warnings = reply.warnings;
- let data = reply.data?;
-
- if warnings.warnings.is_empty() {
- trace!("{} {} responding, {}",
- &conn, &client_name, data.len());
- } else {
- debug!("{} {} responding, {} warnings={:?}",
- &conn, &client_name, data.len(),
- &warnings.warnings);
- }
-
- let data = hyper::Body::from(data);
- Ok::<_,AE>(
- hyper::Response::builder()
- .header("Content-Type", r#"application/octet-stream"#)
- .body(data)
- )
- }.await.unwrap_or_else(|e| {
- debug!("{} error {}", &conn, &e);
- let mut errmsg = format!("ERROR\n\n{:?}\n\n", &e);
- for w in warnings.warnings {
- write!(errmsg, "warning: {}\n", w).unwrap();
- }
- hyper::Response::builder()
- .status(hyper::StatusCode::BAD_REQUEST)
- .header("Content-Type", r#"text/plain; charset="utf-8""#)
- .body(errmsg.into())
- })
-}
-
-#[allow(unused_variables)] // xxx
-#[allow(unused_mut)] // xxx
-async fn run_client(global: Arc<Global>,
- ic: Arc<InstanceConfig>,
- mut web: mpsc::Receiver<WebRequest>,
- mut routed: mpsc::Receiver<RoutedPacket>)
- -> Result<Void, AE>
-{
- struct Outstanding {
- reply_to: oneshot::Sender<WebResponse>,
- oi: OutstandingInner,
- }
- #[derive(Debug)]
- struct OutstandingInner {
- target_requests_outstanding: u32,
- }
- let mut outstanding: VecDeque<Outstanding> = default();
- let downbound: VecDeque<(/*xxx*/)> = default();
-
- let try_send_response = |
- reply_to: 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.oi.target_requests_outstanding.sat()
- }) {
- Some(outstanding.remove(i).unwrap())
- } else {
- None
- }
- } {
- let response = WebResponse {
- data: Ok(vec![ /* xxx */ ]),
- warnings: default(),
- };
-
- try_send_response(ret.reply_to, response);
- }
-
- select!{
- req = web.recv() =>
- {
- let WebRequest {
- initial, initial_remaining, length_hint, mut body,
- boundary_finder,
- reply_to, conn, mut warnings,
- } = req.ok_or_else(|| anyhow!("webservers all shut down!"))?;
-
- match async {
-
- let initial_used = initial.len() - initial_remaining;
-
- let whole_request = read_limited_bytes(
- ic.max_batch_up.sat(),
- initial,
- length_hint,
- &mut body
- ).await.context("read request body")?;
-
- let (meta, mut comps) =
- multipart::ComponentIterator::resume_mid_component(
- &whole_request[initial_used..],
- boundary_finder
- ).context("resume parsing body, after auth checks")?;
-
- let mut meta = MetadataFieldIterator::new(&meta);
-
- macro_rules! meta {
- { $v:ident, ( $( $badcmp:tt )? ), $ret:expr,
- let $server:ident, $client:ident $($code:tt)*
- } => {
- let $v = (||{
- let $server = ic.$v;
- let $client $($code)*
- $(
- if $client $badcmp $server {
- throw!(anyhow!("mismatch: client={:?} {} server={:?}",
- $client, stringify!($badcmp), $server));
- }
- )?
- Ok::<_,AE>($ret)
- })().context(stringify!($v))?;
- //dbg!(&$v);
- }
- }
-
- meta!{
- target_requests_outstanding, ( != ), client,
- let server, client: u32 = meta.need_parse()?;
- }
-
- meta!{
- http_timeout, ( > ), client,
- let server, client = Duration::from_secs(meta.need_parse()?);
- }
-
- meta!{
- mtu, ( != ), client,
- let server, client: u32 = meta.parse()?.unwrap_or(server);
- }
-
- meta!{
- max_batch_down, (), min(client, server),
- let server, client: u32 = meta.parse()?.unwrap_or(server);
- }
-
- meta!{
- max_batch_up, ( > ), client,
- let server, client = meta.parse()?.unwrap_or(server);
- }
-
- while let Some(comp) = comps.next(&mut warnings, PartName::d)? {
- if comp.name != PartName::d {
- warnings.add(&format_args!("unexpected part {:?}", comp.name))?;
- }
- checkn(Mime2Slip, mtu, comp.payload, |header| {
- let saddr = ip_packet_addr::<false>(header)?;
- if saddr != ic.link.client.0 { throw!(PE::Src(saddr)) }
- let daddr = ip_packet_addr::<true>(header)?;
- Ok(daddr)
- }, |(daddr,packet)| route_packet(
- &global, &conn, &ic.link.client, daddr,packet
- ),
- |e| Ok::<_,SlipFramesError<_>>({ warnings.add(&e)?; })
- ).await?;
- }
-
- let oi = OutstandingInner {
- target_requests_outstanding,
- };
- Ok::<_,AE>(oi)
- }.await {
- Ok(oi) => outstanding.push_back(Outstanding { reply_to, oi }),
- Err(e) => {
- try_send_response(reply_to, WebResponse {
- data: Err(e),
- warnings,
- });
- },
- }
- }
- }
- }
- //Err(anyhow!("xxx"))
-}
-
#[tokio::main]
async fn main() {
let opts = Opts::from_args();
let global_ = global.clone();
let ic_ = ic.clone();
tasks.push((tokio::spawn(async move {
- run_client(global_, ic_, web_recv, route_recv)
+ sclient::run(global_, ic_, web_recv, route_recv)
.await.void_unwrap_err()
}), format!("client {}", &ic)));
}
let global_ = global_.clone();
let conn = Arc::new(format!("[{}]", conn.remote_addr()));
async { Ok::<_, Void>( hyper::service::service_fn(move |req| {
- handle(conn.clone(), global_.clone(), req)
+ sweb::handle(conn.clone(), global_.clone(), req)
}) ) }
}
);
--- /dev/null
+// Copyright 2021 Ian Jackson and contributors to Hippotat
+// SPDX-License-Identifier: GPL-3.0-or-later
+// There is NO WARRANTY.
+
+use super::*;
+
+/// Sent from hyper worker pool task to client task
+#[allow(dead_code)] // xxx
+#[derive(Debug)]
+pub struct WebRequest {
+ // 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
+ pub initial: Box<[u8]>,
+ pub initial_remaining: usize,
+ pub length_hint: usize,
+ pub body: hyper::body::Body,
+ pub boundary_finder: multipart::BoundaryFinder,
+ pub reply_to: oneshot::Sender<WebResponse>,
+ pub warnings: Warnings,
+ pub conn: Arc<String>,
+}
+
+/// Reply from client task to hyper worker pool task
+#[allow(dead_code)] // xxx
+#[derive(Debug)]
+pub struct WebResponse {
+ pub warnings: Warnings,
+ pub data: Result<WebResponseData, AE>,
+}
+
+pub type WebResponseData = Vec<u8>;
+
+pub async fn handle(
+ conn: Arc<String>,
+ global: Arc<Global>,
+ req: hyper::Request<hyper::Body>
+) -> Result<hyper::Response<hyper::Body>, hyper::http::Error> {
+ if req.method() == Method::GET {
+ let mut resp = hyper::Response::new(hyper::Body::from("hippotat\r\n"));
+ resp.headers_mut().insert(
+ "Content-Type",
+ "text/plain; charset=US-ASCII".try_into().unwrap()
+ );
+ return Ok(resp)
+ }
+
+ let mut warnings: Warnings = default();
+
+ 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 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 b = t.get_param(b).ok_or_else(|| anyhow!("missing boundary=..."))?;
+ if t.subtype() != "form-data" {
+ warnings.add(&"Content-Type not /form-data")?;
+ }
+ let b = mkboundary(b.as_str());
+ Ok::<_,AE>(b)
+ })() {
+ Ok(y) => y,
+ Err(e) => {
+ warnings.add(&e.wrap_err("guessing boundary"))?;
+ mkboundary("b")
+ },
+ };
+
+ 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, default(), length_hint, &mut body
+ ).await {
+ Ok(all) => all,
+ Err(ReadLimitedError::Truncated { sofar,.. }) => sofar,
+ Err(ReadLimitedError::Hyper(e)) => throw!(e),
+ };
+
+ let boundary_finder = memmem::Finder::new(&boundary);
+ let mut boundary_iter = boundary_finder.find_iter(&initial);
+
+ let start = if initial.starts_with(&boundary[1..]) { boundary.len()-1 }
+ else if let Some(start) = boundary_iter.next() { start + boundary.len() }
+ else { throw!(anyhow!("initial boundary not found")) };
+
+ let comp = multipart::process_boundary
+ (&mut warnings, &initial[start..], PartName::m)?
+ .ok_or_else(|| anyhow!(r#"no "m" component"#))?;
+
+ if comp.name != PartName::m { throw!(anyhow!(
+ r#"first multipart component must be name="m""#
+ )) }
+
+ let mut meta = MetadataFieldIterator::new(comp.payload);
+
+ let client: ClientName = meta.need_parse().context("client addr")?;
+
+ 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_name = client;
+ let client = global.all_clients.get(&client_name);
+
+ // 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) {
+ debug!("{} rejected client {}", &conn, &client_name);
+ let body = hyper::Body::from("Not authorised\r\n");
+ return Ok(
+ hyper::Response::builder()
+ .status(hyper::StatusCode::FORBIDDEN)
+ .header("Content-Type", r#"text/plain; charset="utf-8""#)
+ .body(body)
+ )
+ }
+
+ 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();
+
+ //eprintln!("boundary={:?} start={} name={:?} client={}",
+ // boundary, start, &comp.name, &client.ic);
+
+ let (reply_to, reply_recv) = oneshot::channel();
+ trace!("{} {} request, Content-Length={}",
+ &conn, &client_name, length_hint);
+ let wreq = WebRequest {
+ initial,
+ initial_remaining,
+ length_hint,
+ boundary_finder: boundary_finder.into_owned(),
+ body,
+ warnings: mem::take(&mut warnings),
+ reply_to,
+ conn: conn.clone(),
+ };
+
+ client.web.try_send(wreq)
+ .map_err(|_| anyhow!("client task shut down!"))?;
+
+ let reply: WebResponse = reply_recv.await?;
+ warnings = reply.warnings;
+ let data = reply.data?;
+
+ if warnings.warnings.is_empty() {
+ trace!("{} {} responding, {}",
+ &conn, &client_name, data.len());
+ } else {
+ debug!("{} {} responding, {} warnings={:?}",
+ &conn, &client_name, data.len(),
+ &warnings.warnings);
+ }
+
+ let data = hyper::Body::from(data);
+ Ok::<_,AE>(
+ hyper::Response::builder()
+ .header("Content-Type", r#"application/octet-stream"#)
+ .body(data)
+ )
+ }.await.unwrap_or_else(|e| {
+ debug!("{} error {}", &conn, &e);
+ let mut errmsg = format!("ERROR\n\n{:?}\n\n", &e);
+ for w in warnings.warnings {
+ write!(errmsg, "warning: {}\n", w).unwrap();
+ }
+ hyper::Response::builder()
+ .status(hyper::StatusCode::BAD_REQUEST)
+ .header("Content-Type", r#"text/plain; charset="utf-8""#)
+ .body(errmsg.into())
+ })
+}
~ian / hippotat.git / commitdiff