2019-09-21 16:26:11 +00:00
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//! Types for setting up Digest middleware verification
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2019-09-13 01:12:35 +00:00
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use actix_web::{
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dev::{Body, Payload, Service, ServiceRequest, ServiceResponse, Transform},
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error::PayloadError,
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http::{header::HeaderValue, StatusCode},
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FromRequest, HttpMessage, HttpRequest, HttpResponse, ResponseError,
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};
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use bytes::{Bytes, BytesMut};
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use futures::{
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future::{err, ok, ready, Ready},
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stream::once,
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Stream, StreamExt,
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};
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use std::{
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cell::RefCell,
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future::Future,
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pin::Pin,
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rc::Rc,
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task::{Context, Poll},
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};
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use super::{DigestPart, DigestVerify};
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2019-09-13 23:27:04 +00:00
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#[derive(Copy, Clone, Debug)]
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/// A type implementing FromRequest that can be used in route handler to guard for verified
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/// digests
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///
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/// This is only required when the [`VerifyDigest`] middleware is set to optional
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pub struct DigestVerified;
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/// The VerifyDigest middleware
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///
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/// ```rust,ignore
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/// let middleware = VerifyDigest::new(MyVerify::new())
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/// .optional();
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///
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/// HttpServer::new(move || {
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/// App::new()
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/// .wrap(middleware.clone())
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/// .route("/protected", web::post().to(|_: DigestVerified| "Verified Digest Header"))
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/// .route("/unprotected", web::post().to(|| "No verification required"))
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/// })
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/// ```
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pub struct VerifyDigest<T>(bool, T);
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#[doc(hidden)]
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pub struct VerifyMiddleware<T, S>(Rc<RefCell<S>>, bool, T);
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#[derive(Debug, thiserror::Error)]
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#[error("Error verifying digest")]
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#[doc(hidden)]
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pub struct VerifyError;
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impl<T> VerifyDigest<T>
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where
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T: DigestVerify + Clone,
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{
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/// Produce a new VerifyDigest with a user-provided [`Digestverify`] type
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pub fn new(verify_digest: T) -> Self {
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VerifyDigest(true, verify_digest)
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}
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/// Mark verifying the Digest as optional
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///
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/// If a digest is present in the request, it will be verified, but it is not required to be
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/// present
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pub fn optional(self) -> Self {
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VerifyDigest(false, self.1)
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}
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}
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impl FromRequest for DigestVerified {
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type Error = VerifyError;
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type Future = Ready<Result<Self, Self::Error>>;
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type Config = ();
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fn from_request(req: &HttpRequest, _: &mut Payload) -> Self::Future {
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ready(
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req.extensions()
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.get::<Self>()
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.map(|s| *s)
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.ok_or(VerifyError),
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)
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}
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}
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impl<T, S> Transform<S> for VerifyDigest<T>
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where
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T: DigestVerify + Clone + 'static,
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S: Service<
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Request = ServiceRequest,
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Response = ServiceResponse<Body>,
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Error = actix_web::Error,
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> + 'static,
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S::Error: 'static,
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{
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type Request = ServiceRequest;
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type Response = ServiceResponse<Body>;
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type Error = actix_web::Error;
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type Transform = VerifyMiddleware<T, S>;
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type InitError = ();
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type Future = Ready<Result<Self::Transform, Self::InitError>>;
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fn new_transform(&self, service: S) -> Self::Future {
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ok(VerifyMiddleware(
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Rc::new(RefCell::new(service)),
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self.0,
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self.1.clone(),
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))
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}
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}
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impl<T, S> Service for VerifyMiddleware<T, S>
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where
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T: DigestVerify + Clone + 'static,
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S: Service<
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Request = ServiceRequest,
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Response = ServiceResponse<Body>,
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Error = actix_web::Error,
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> + 'static,
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S::Error: 'static,
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{
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type Request = ServiceRequest;
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type Response = ServiceResponse<Body>;
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type Error = actix_web::Error;
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type Future = Pin<Box<dyn Future<Output = Result<Self::Response, Self::Error>>>>;
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fn poll_ready(&mut self, cx: &mut Context) -> Poll<Result<(), Self::Error>> {
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self.0.borrow_mut().poll_ready(cx)
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}
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fn call(&mut self, mut req: ServiceRequest) -> Self::Future {
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if let Some(digest) = req.headers().get("Digest") {
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let vec = match parse_digest(digest) {
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Some(vec) => vec,
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None => return Box::pin(err(VerifyError.into())),
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};
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let mut payload = req.take_payload();
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let service = self.0.clone();
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let mut verify_digest = self.2.clone();
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Box::pin(async move {
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let mut output_bytes = BytesMut::new();
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while let Some(res) = payload.next().await {
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let bytes = res?;
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output_bytes.extend(bytes);
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}
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let bytes = output_bytes.freeze();
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if verify_digest.verify(&vec, &bytes.as_ref()) {
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req.set_payload(
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(Box::pin(once(ok(bytes)))
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as Pin<Box<dyn Stream<Item = Result<Bytes, PayloadError>> + 'static>>)
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.into(),
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);
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req.extensions_mut().insert(DigestVerified);
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service.borrow_mut().call(req).await
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} else {
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Err(VerifyError.into())
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}
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})
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} else if self.1 {
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Box::pin(err(VerifyError.into()))
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} else {
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Box::pin(self.0.borrow_mut().call(req))
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}
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}
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}
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fn parse_digest(h: &HeaderValue) -> Option<Vec<DigestPart>> {
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let h = h.to_str().ok()?.split(";").next()?;
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let v: Vec<_> = h
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.split(",")
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.filter_map(|p| {
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let mut iter = p.splitn(2, "=");
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iter.next()
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.and_then(|alg| iter.next().map(|value| (alg, value)))
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})
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.map(|(alg, value)| DigestPart {
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algorithm: alg.to_owned(),
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digest: value.to_owned(),
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})
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.collect();
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if v.is_empty() {
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None
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} else {
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Some(v)
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}
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}
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impl ResponseError for VerifyError {
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fn status_code(&self) -> StatusCode {
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StatusCode::BAD_REQUEST
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}
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fn error_response(&self) -> HttpResponse {
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HttpResponse::BadRequest().finish()
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}
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}
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