mirror of
https://git.asonix.dog/asonix/http-signature-normalization.git
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190 lines
5.3 KiB
Rust
190 lines
5.3 KiB
Rust
//! Types for setting up Digest middleware verification
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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,
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web::Bytes,
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FromRequest, HttpMessage, HttpRequest, HttpResponse, ResponseError,
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};
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use failure::Fail;
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use futures::{
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future::{err, ok, Either, FutureResult},
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stream::once,
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Future, Poll, Stream,
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};
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use std::{cell::RefCell, rc::Rc};
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use super::{DigestPart, DigestVerify};
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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, Fail)]
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#[fail(display = "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 = 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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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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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 = FutureResult<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 = Box<dyn Future<Item = Self::Response, Error = Self::Error>>;
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fn poll_ready(&mut self) -> Poll<(), Self::Error> {
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self.0.borrow_mut().poll_ready()
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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::new(err(VerifyError.into())),
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};
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let 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::new(payload.concat2().from_err().and_then(move |bytes| {
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if verify_digest.verify(&vec, &bytes.as_ref()) {
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req.set_payload(
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(Box::new(once(Ok(bytes)))
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as Box<dyn Stream<Item = Bytes, Error = PayloadError>>)
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.into(),
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);
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req.extensions_mut().insert(DigestVerified);
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Either::A(service.borrow_mut().call(req))
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} else {
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Either::B(err(VerifyError.into()))
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}
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}))
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} else if self.1 {
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Box::new(err(VerifyError.into()))
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} else {
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Box::new(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 error_response(&self) -> HttpResponse {
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HttpResponse::BadRequest().finish()
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}
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fn render_response(&self) -> HttpResponse {
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Self::error_response(self)
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}
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}
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