Rustls v0.21 support (#480)

2024-11-27 15:42:57 +01:00 · 2023-08-26 14:59:51 +01:00 · 2023-08-26 14:59:51 +01:00 · 0bc310a656
commit 0bc310a656
parent 6ce8307060
19 changed files with 504 additions and 75 deletions
--- a/.cargo/config.toml
+++ b/.cargo/config.toml
@ -15,9 +15,11 @@ ci-check-linux = "hack --workspace --feature-powerset check --tests --examples"

 # tests avoiding io-uring feature
 ci-test = "hack --feature-powerset --exclude-features=io-uring test --lib --tests --no-fail-fast -- --nocapture"
+ci-test-rustls-020 = "hack --feature-powerset --exclude-features=io-uring,rustls-0_21 test --lib --tests --no-fail-fast -- --nocapture"
+ci-test-rustls-021 = "hack --feature-powerset --exclude-features=io-uring,rustls-0_20 test --lib --tests --no-fail-fast -- --nocapture"

 # tests avoiding io-uring feature on Windows
-ci-test-win = "hack --feature-powerset --depth 2 --exclude-features=io-uring test --lib --tests --no-fail-fast -- --nocapture"
+ci-test-win = "hack --feature-powerset --depth=2 --exclude-features=io-uring test --lib --tests --no-fail-fast -- --nocapture"

 # test with io-uring feature
-ci-test-linux = "hack --feature-powerset test --lib --tests --no-fail-fast -- --nocapture"
+ci-test-linux = "hack --feature-powerset --exclude-features=rustls-0_20 test --lib --tests --no-fail-fast -- --nocapture"
--- a/.github/workflows/ci-post-merge.yml
+++ b/.github/workflows/ci-post-merge.yml
@ -16,6 +16,7 @@ jobs:
    strategy:
      fail-fast: false
      matrix:
+        # prettier-ignore
        target:
          - { name: Linux, os: ubuntu-latest, triple: x86_64-unknown-linux-gnu }
          - { name: macOS, os: macos-latest, triple: x86_64-apple-darwin }
@ -37,6 +38,10 @@ jobs:

      - uses: actions/checkout@v3

+      - name: Free Disk Space
+        if: matrix.target.os == 'ubuntu-latest'
+        run: ./scripts/free-disk-space.sh
+
      - name: Install OpenSSL
        if: matrix.target.os == 'windows-latest'
        run: choco install openssl -y --forcex64 --no-progress
@ -83,8 +88,15 @@ jobs:
        run: cargo ci-test
      - name: tests
        if: matrix.target.os == 'ubuntu-latest'
-        run: |
-          sudo bash -c "ulimit -Sl 512 && ulimit -Hl 512 && PATH=$PATH:/usr/share/rust/.cargo/bin && RUSTUP_TOOLCHAIN=${{ matrix.version }} cargo ci-test && RUSTUP_TOOLCHAIN=${{ matrix.version }} cargo ci-test-linux"
+        run: >-
+          sudo bash -c "
+          ulimit -Sl 512
+          && ulimit -Hl 512
+          && PATH=$PATH:/usr/share/rust/.cargo/bin
+          && RUSTUP_TOOLCHAIN=${{ matrix.version }} cargo ci-test-rustls-020
+          && RUSTUP_TOOLCHAIN=${{ matrix.version }} cargo ci-test-rustls-021
+          && RUSTUP_TOOLCHAIN=${{ matrix.version }} cargo ci-test-linux
+          "

      - name: Clear the cargo caches
        run: |
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@ -16,6 +16,7 @@ jobs:
    strategy:
      fail-fast: false
      matrix:
+        # prettier-ignore
        target:
          - { name: Linux, os: ubuntu-latest, triple: x86_64-unknown-linux-gnu }
          - { name: macOS, os: macos-latest, triple: x86_64-apple-darwin }
@ -99,8 +100,15 @@ jobs:
        run: cargo ci-test-win
      - name: tests
        if: matrix.target.os == 'ubuntu-latest'
-        run: |
-          sudo bash -c "ulimit -Sl 512 && ulimit -Hl 512 && PATH=$PATH:/usr/share/rust/.cargo/bin && RUSTUP_TOOLCHAIN=${{ matrix.version }} cargo ci-test && RUSTUP_TOOLCHAIN=${{ matrix.version }} cargo ci-test-linux"
+        run: >-
+          sudo bash -c "
+          ulimit -Sl 512
+          && ulimit -Hl 512
+          && PATH=$PATH:/usr/share/rust/.cargo/bin
+          && RUSTUP_TOOLCHAIN=${{ matrix.version }} cargo ci-test-rustls-020
+          && RUSTUP_TOOLCHAIN=${{ matrix.version }} cargo ci-test-rustls-021
+          && RUSTUP_TOOLCHAIN=${{ matrix.version }} cargo ci-test-linux
+          "

      - name: Clear the cargo caches
        run: |
--- a/Cargo.toml
+++ b/Cargo.toml
@ -15,6 +15,7 @@ members = [
 resolver = "2"

 [workspace.package]
+license = "MIT OR Apache-2.0"
 edition = "2021"
 rust-version = "1.65"

--- a/actix-server/src/worker.rs
+++ b/actix-server/src/worker.rs
@ -625,6 +625,7 @@ impl Future for ServerWorker {
                    self.poll(cx)
                }
            },
+
            WorkerState::Restarting(ref mut restart) => {
                let factory_id = restart.factory_id;
                let token = restart.token;
@ -649,6 +650,7 @@ impl Future for ServerWorker {

                self.poll(cx)
            }
+
            WorkerState::Shutdown(ref mut shutdown) => {
                // drop all pending connections in rx channel.
                while let Poll::Ready(Some(conn)) = this.conn_rx.poll_recv(cx) {
@ -682,6 +684,7 @@ impl Future for ServerWorker {
                    shutdown.timer.as_mut().poll(cx)
                }
            }
+
            // actively poll stream and handle worker command
            WorkerState::Available => loop {
                match this.check_readiness(cx) {
--- a/actix-tls/CHANGES.md
+++ b/actix-tls/CHANGES.md
@ -1,40 +1,43 @@
 # Changes

-## Unreleased - 2023-xx-xx
+## Unreleased

+- Support Rustls v0.21.
+- Added `{accept, connect}::rustls_0_21` modules.
+- Added `{accept, connect}::rustls_0_20` alias for `{accept, connect}::rustls` modules.
 - Minimum supported Rust version (MSRV) is now 1.65.

-## 3.0.4 - 2022-03-15
+## 3.0.4

 - Logs emitted now use the `tracing` crate with `log` compatibility. [#451]

 [#451]: https://github.com/actix/actix-net/pull/451

-## 3.0.3 - 2022-02-15
+## 3.0.3

 - No significant changes since `3.0.2`.

-## 3.0.2 - 2022-01-28
+## 3.0.2

 - Expose `connect::Connection::new`. [#439]

 [#439]: https://github.com/actix/actix-net/pull/439

-## 3.0.1 - 2022-01-11
+## 3.0.1

 - No significant changes since `3.0.0`.

-## 3.0.0 - 2021-12-26
+## 3.0.0

 - No significant changes since `3.0.0-rc.2`.

-## 3.0.0-rc.2 - 2021-12-10
+## 3.0.0-rc.2

 - Re-export `openssl::SslConnectorBuilder` in `connect::openssl::reexports`. [#429]

 [#429]: https://github.com/actix/actix-net/pull/429

-## 3.0.0-rc.1 - 2021-11-29
+## 3.0.0-rc.1

 ### Added

@ -72,7 +75,7 @@
 [#422]: https://github.com/actix/actix-net/pull/422
 [#423]: https://github.com/actix/actix-net/pull/423

-## 3.0.0-beta.9 - 2021-11-22
+## 3.0.0-beta.9

 - Add configurable timeout for accepting TLS connection. [#393]
 - Added `TlsError::Timeout` variant. [#393]
@ -82,20 +85,20 @@
 [#393]: https://github.com/actix/actix-net/pull/393
 [#420]: https://github.com/actix/actix-net/pull/420

-## 3.0.0-beta.8 - 2021-11-15
+## 3.0.0-beta.8

 - Add `Connect::request` for getting a reference to the connection request. [#415]

 [#415]: https://github.com/actix/actix-net/pull/415

-## 3.0.0-beta.7 - 2021-10-20
+## 3.0.0-beta.7

 - Add `webpki_roots_cert_store()` to get rustls compatible webpki roots cert store. [#401]
 - Alias `connect::ssl` to `connect::tls`. [#401]

 [#401]: https://github.com/actix/actix-net/pull/401

-## 3.0.0-beta.6 - 2021-10-19
+## 3.0.0-beta.6

 - Update `tokio-rustls` to `0.23` which uses `rustls` `0.20`. [#396]
 - Removed a re-export of `Session` from `rustls` as it no longer exist. [#396]
@ -103,7 +106,7 @@

 [#396]: https://github.com/actix/actix-net/pull/396

-## 3.0.0-beta.5 - 2021-03-29
+## 3.0.0-beta.5

 - Changed `connect::ssl::rustls::RustlsConnectorService` to return error when `DNSNameRef` generation failed instead of panic. [#296]
 - Remove `connect::ssl::openssl::OpensslConnectServiceFactory`. [#297]
@ -117,7 +120,7 @@
 [#297]: https://github.com/actix/actix-net/pull/297
 [#299]: https://github.com/actix/actix-net/pull/299

-## 3.0.0-beta.4 - 2021-02-24
+## 3.0.0-beta.4

 - Rename `accept::openssl::{SslStream => TlsStream}`.
 - Add `connect::Connect::set_local_addr` to attach local `IpAddr`. [#282]
@ -125,7 +128,7 @@

 [#282]: https://github.com/actix/actix-net/pull/282

-## 3.0.0-beta.3 - 2021-02-06
+## 3.0.0-beta.3

 - Remove `trust-dns-proto` and `trust-dns-resolver`. [#248]
 - Use `std::net::ToSocketAddrs` as simple and basic default resolver. [#248]
@ -139,13 +142,13 @@
 [#248]: https://github.com/actix/actix-net/pull/248
 [#273]: https://github.com/actix/actix-net/pull/273

-## 3.0.0-beta.2 - 2022-xx-xx
+## 3.0.0-beta.2

 - Depend on stable trust-dns packages. [#204]

 [#204]: https://github.com/actix/actix-net/pull/204

-## 3.0.0-beta.1 - 2020-12-29
+## 3.0.0-beta.1

 - Move acceptors under `accept` module. [#238]
 - Merge `actix-connect` crate under `connect` module. [#238]
@ -153,7 +156,7 @@

 [#238]: https://github.com/actix/actix-net/pull/238

-## 2.0.0 - 2020-09-03
+## 2.0.0

 - `nativetls::NativeTlsAcceptor` is renamed to `nativetls::Acceptor`.
 - Where possible, "SSL" terminology is replaced with "TLS".
@ -161,28 +164,28 @@
  - `TlsError::Ssl` enum variant is renamed to `TlsError::Tls`.
  - `max_concurrent_ssl_connect` is renamed to `max_concurrent_tls_connect`.

-## 2.0.0-alpha.2 - 2020-08-17
+## 2.0.0-alpha.2

 - Update `rustls` dependency to 0.18
 - Update `tokio-rustls` dependency to 0.14
 - Update `webpki-roots` dependency to 0.20

-## [2.0.0-alpha.1] - 2020-03-03
+## [2.0.0-alpha.1]

 - Update `rustls` dependency to 0.17
 - Update `tokio-rustls` dependency to 0.13
 - Update `webpki-roots` dependency to 0.19

-## [1.0.0] - 2019-12-11
+## [1.0.0]

 - 1.0.0 release

-## [1.0.0-alpha.3] - 2019-12-07
+## [1.0.0-alpha.3]

 - Migrate to tokio 0.2
 - Enable rustls acceptor service
 - Enable native-tls acceptor service

-## [1.0.0-alpha.1] - 2019-12-02
+## [1.0.0-alpha.1]

 - Split openssl acceptor from actix-server package
--- a/actix-tls/Cargo.toml
+++ b/actix-tls/Cargo.toml
@ -9,7 +9,7 @@ description = "TLS acceptor and connector services for Actix ecosystem"
 keywords = ["network", "tls", "ssl", "async", "transport"]
 repository = "https://github.com/actix/actix-net.git"
 categories = ["network-programming", "asynchronous", "cryptography"]
-license = "MIT OR Apache-2.0"
+license.workspace = true
 edition.workspace = true
 rust-version.workspace = true

@ -29,8 +29,14 @@ connect = []
 # use openssl impls
 openssl = ["tls-openssl", "tokio-openssl"]

-# use rustls impls
-rustls = ["tokio-rustls", "webpki-roots"]
+# alias for backwards compat
+rustls = ["rustls-0_20"]
+
+# use rustls v0.20 impls
+rustls-0_20 = ["tokio-rustls-023", "webpki-roots-022"]
+
+# use rustls v0.21 impls
+rustls-0_21 = ["tokio-rustls-024", "webpki-roots-025"]

 # use native-tls impls
 native-tls = ["tokio-native-tls"]
@ -57,9 +63,13 @@ http = { version = "0.2.3", optional = true }
 tls-openssl = { package = "openssl", version = "0.10.48", optional = true }
 tokio-openssl = { version = "0.6", optional = true }

-# rustls
-tokio-rustls = { version = "0.23", optional = true }
-webpki-roots = { version = "0.22", optional = true }
+# rustls v0.20
+tokio-rustls-023 = { package = "tokio-rustls", version = "0.23", optional = true }
+webpki-roots-022 = { package = "webpki-roots", version = "0.22", optional = true }
+
+# rustls v0.21
+tokio-rustls-024 = { package = "tokio-rustls", version = "0.24", optional = true }
+webpki-roots-025 = { package = "webpki-roots", version = "0.25", optional = true }

 # native-tls
 tokio-native-tls = { version = "0.3", optional = true }
@ -72,11 +82,11 @@ bytes = "1"
 env_logger = "0.10"
 futures-util = { version = "0.3.17", default-features = false, features = ["sink"] }
 log = "0.4"
-rcgen = "0.10"
+rcgen = "0.11"
 rustls-pemfile = "1"
-tokio-rustls = { version = "0.23", features = ["dangerous_configuration"] }
-trust-dns-resolver = "0.22"
+tokio-rustls-024 = { package = "tokio-rustls", version = "0.24", features = ["dangerous_configuration"] }
+trust-dns-resolver = "0.23"

 [[example]]
 name = "accept-rustls"
-required-features = ["accept", "rustls"]
+required-features = ["accept", "rustls-0_21"]
--- a/actix-tls/examples/accept-rustls.rs
+++ b/actix-tls/examples/accept-rustls.rs
@ -17,12 +17,13 @@

 #[rustfmt::skip]
 // this `use` is only exists because of how we have organised the crate
-// it is not necessary for your actual code; you should import from `rustls` directly
-use tokio_rustls::rustls;
+// it is not necessary for your actual code; you should import from `rustls` normally
+use tokio_rustls_024::rustls;

 use std::{
    fs::File,
    io::{self, BufReader},
+    path::PathBuf,
    sync::{
        atomic::{AtomicUsize, Ordering},
        Arc,
@ -32,7 +33,7 @@ use std::{
 use actix_rt::net::TcpStream;
 use actix_server::Server;
 use actix_service::ServiceFactoryExt as _;
-use actix_tls::accept::rustls::{Acceptor as RustlsAcceptor, TlsStream};
+use actix_tls::accept::rustls_0_21::{Acceptor as RustlsAcceptor, TlsStream};
 use futures_util::future::ok;
 use rustls::{server::ServerConfig, Certificate, PrivateKey};
 use rustls_pemfile::{certs, rsa_private_keys};
@ -42,9 +43,16 @@ use tracing::info;
 async fn main() -> io::Result<()> {
    env_logger::init_from_env(env_logger::Env::default().default_filter_or("info"));

+    let root_path = env!("CARGO_MANIFEST_DIR")
+        .parse::<PathBuf>()
+        .unwrap()
+        .join("examples");
+    let cert_path = root_path.clone().join("cert.pem");
+    let key_path = root_path.clone().join("key.pem");
+
    // Load TLS key and cert files
-    let cert_file = &mut BufReader::new(File::open("./examples/cert.pem").unwrap());
-    let key_file = &mut BufReader::new(File::open("./examples/key.pem").unwrap());
+    let cert_file = &mut BufReader::new(File::open(cert_path).unwrap());
+    let key_file = &mut BufReader::new(File::open(key_path).unwrap());

    let cert_chain = certs(cert_file)
        .unwrap()
@ -64,7 +72,7 @@ async fn main() -> io::Result<()> {
    let count = Arc::new(AtomicUsize::new(0));

    let addr = ("127.0.0.1", 8443);
-    info!("starting server on port: {}", &addr.0);
+    info!("starting server at: {addr:?}");

    Server::build()
        .bind("tls-example", addr, move || {
--- a/actix-tls/src/accept/mod.rs
+++ b/actix-tls/src/accept/mod.rs
@ -12,15 +12,27 @@ use actix_utils::counter::Counter;
 #[cfg(feature = "openssl")]
 pub mod openssl;

-#[cfg(feature = "rustls")]
-pub mod rustls;
+#[cfg(feature = "rustls-0_20")]
+pub mod rustls_0_20;
+
+#[doc(hidden)]
+#[cfg(feature = "rustls-0_20")]
+pub use rustls_0_20 as rustls;
+
+#[cfg(feature = "rustls-0_21")]
+pub mod rustls_0_21;

 #[cfg(feature = "native-tls")]
 pub mod native_tls;

 pub(crate) static MAX_CONN: AtomicUsize = AtomicUsize::new(256);

-#[cfg(any(feature = "openssl", feature = "rustls", feature = "native-tls"))]
+#[cfg(any(
+    feature = "openssl",
+    feature = "rustls-0_20",
+    feature = "rustls-0_21",
+    feature = "native-tls",
+))]
 pub(crate) const DEFAULT_TLS_HANDSHAKE_TIMEOUT: std::time::Duration =
    std::time::Duration::from_secs(3);

--- a/actix-tls/src/accept/rustls_0_20.rs
+++ b/actix-tls/src/accept/rustls_0_20.rs
@ -1,4 +1,4 @@
-//! `rustls` based TLS connection acceptor service.
+//! `rustls` v0.20 based TLS connection acceptor service.
 //!
 //! See [`Acceptor`] for main service factory docs.

@ -24,13 +24,14 @@ use actix_utils::{
 use pin_project_lite::pin_project;
 use tokio::io::{AsyncRead, AsyncWrite, ReadBuf};
 use tokio_rustls::{rustls::ServerConfig, Accept, TlsAcceptor};
+use tokio_rustls_023 as tokio_rustls;

 use super::{TlsError, DEFAULT_TLS_HANDSHAKE_TIMEOUT, MAX_CONN_COUNTER};

 pub mod reexports {
    //! Re-exports from `rustls` that are useful for acceptors.

-    pub use tokio_rustls::rustls::ServerConfig;
+    pub use tokio_rustls_023::rustls::ServerConfig;
 }

 /// Wraps a `rustls` based async TLS stream in order to implement [`ActixStream`].
--- a/actix-tls/src/accept/rustls_0_21.rs
+++ b/actix-tls/src/accept/rustls_0_21.rs
@ -0,0 +1,198 @@
+//! `rustls` v0.21 based TLS connection acceptor service.
+//!
+//! See [`Acceptor`] for main service factory docs.
+
+use std::{
+    convert::Infallible,
+    future::Future,
+    io::{self, IoSlice},
+    pin::Pin,
+    sync::Arc,
+    task::{Context, Poll},
+    time::Duration,
+};
+
+use actix_rt::{
+    net::{ActixStream, Ready},
+    time::{sleep, Sleep},
+};
+use actix_service::{Service, ServiceFactory};
+use actix_utils::{
+    counter::{Counter, CounterGuard},
+    future::{ready, Ready as FutReady},
+};
+use pin_project_lite::pin_project;
+use tokio::io::{AsyncRead, AsyncWrite, ReadBuf};
+use tokio_rustls::{rustls::ServerConfig, Accept, TlsAcceptor};
+use tokio_rustls_024 as tokio_rustls;
+
+use super::{TlsError, DEFAULT_TLS_HANDSHAKE_TIMEOUT, MAX_CONN_COUNTER};
+
+pub mod reexports {
+    //! Re-exports from `rustls` that are useful for acceptors.
+
+    pub use tokio_rustls_024::rustls::ServerConfig;
+}
+
+/// Wraps a `rustls` based async TLS stream in order to implement [`ActixStream`].
+pub struct TlsStream<IO>(tokio_rustls::server::TlsStream<IO>);
+
+impl_more::impl_from!(<IO> in tokio_rustls::server::TlsStream<IO> => TlsStream<IO>);
+impl_more::impl_deref_and_mut!(<IO> in TlsStream<IO> => tokio_rustls::server::TlsStream<IO>);
+
+impl<IO: ActixStream> AsyncRead for TlsStream<IO> {
+    fn poll_read(
+        self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+        buf: &mut ReadBuf<'_>,
+    ) -> Poll<io::Result<()>> {
+        Pin::new(&mut **self.get_mut()).poll_read(cx, buf)
+    }
+}
+
+impl<IO: ActixStream> AsyncWrite for TlsStream<IO> {
+    fn poll_write(
+        self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+        buf: &[u8],
+    ) -> Poll<io::Result<usize>> {
+        Pin::new(&mut **self.get_mut()).poll_write(cx, buf)
+    }
+
+    fn poll_flush(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
+        Pin::new(&mut **self.get_mut()).poll_flush(cx)
+    }
+
+    fn poll_shutdown(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<io::Result<()>> {
+        Pin::new(&mut **self.get_mut()).poll_shutdown(cx)
+    }
+
+    fn poll_write_vectored(
+        self: Pin<&mut Self>,
+        cx: &mut Context<'_>,
+        bufs: &[IoSlice<'_>],
+    ) -> Poll<io::Result<usize>> {
+        Pin::new(&mut **self.get_mut()).poll_write_vectored(cx, bufs)
+    }
+
+    fn is_write_vectored(&self) -> bool {
+        (**self).is_write_vectored()
+    }
+}
+
+impl<IO: ActixStream> ActixStream for TlsStream<IO> {
+    fn poll_read_ready(&self, cx: &mut Context<'_>) -> Poll<io::Result<Ready>> {
+        IO::poll_read_ready((**self).get_ref().0, cx)
+    }
+
+    fn poll_write_ready(&self, cx: &mut Context<'_>) -> Poll<io::Result<Ready>> {
+        IO::poll_write_ready((**self).get_ref().0, cx)
+    }
+}
+
+/// Accept TLS connections via the `rustls` crate.
+pub struct Acceptor {
+    config: Arc<ServerConfig>,
+    handshake_timeout: Duration,
+}
+
+impl Acceptor {
+    /// Constructs `rustls` based acceptor service factory.
+    pub fn new(config: ServerConfig) -> Self {
+        Acceptor {
+            config: Arc::new(config),
+            handshake_timeout: DEFAULT_TLS_HANDSHAKE_TIMEOUT,
+        }
+    }
+
+    /// Limit the amount of time that the acceptor will wait for a TLS handshake to complete.
+    ///
+    /// Default timeout is 3 seconds.
+    pub fn set_handshake_timeout(&mut self, handshake_timeout: Duration) -> &mut Self {
+        self.handshake_timeout = handshake_timeout;
+        self
+    }
+}
+
+impl Clone for Acceptor {
+    fn clone(&self) -> Self {
+        Self {
+            config: self.config.clone(),
+            handshake_timeout: self.handshake_timeout,
+        }
+    }
+}
+
+impl<IO: ActixStream> ServiceFactory<IO> for Acceptor {
+    type Response = TlsStream<IO>;
+    type Error = TlsError<io::Error, Infallible>;
+    type Config = ();
+    type Service = AcceptorService;
+    type InitError = ();
+    type Future = FutReady<Result<Self::Service, Self::InitError>>;
+
+    fn new_service(&self, _: ()) -> Self::Future {
+        let res = MAX_CONN_COUNTER.with(|conns| {
+            Ok(AcceptorService {
+                acceptor: self.config.clone().into(),
+                conns: conns.clone(),
+                handshake_timeout: self.handshake_timeout,
+            })
+        });
+
+        ready(res)
+    }
+}
+
+/// Rustls based acceptor service.
+pub struct AcceptorService {
+    acceptor: TlsAcceptor,
+    conns: Counter,
+    handshake_timeout: Duration,
+}
+
+impl<IO: ActixStream> Service<IO> for AcceptorService {
+    type Response = TlsStream<IO>;
+    type Error = TlsError<io::Error, Infallible>;
+    type Future = AcceptFut<IO>;
+
+    fn poll_ready(&self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
+        if self.conns.available(cx) {
+            Poll::Ready(Ok(()))
+        } else {
+            Poll::Pending
+        }
+    }
+
+    fn call(&self, req: IO) -> Self::Future {
+        AcceptFut {
+            fut: self.acceptor.accept(req),
+            timeout: sleep(self.handshake_timeout),
+            _guard: self.conns.get(),
+        }
+    }
+}
+
+pin_project! {
+    /// Accept future for Rustls service.
+    #[doc(hidden)]
+    pub struct AcceptFut<IO: ActixStream> {
+        fut: Accept<IO>,
+        #[pin]
+        timeout: Sleep,
+        _guard: CounterGuard,
+    }
+}
+
+impl<IO: ActixStream> Future for AcceptFut<IO> {
+    type Output = Result<TlsStream<IO>, TlsError<io::Error, Infallible>>;
+
+    fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
+        let mut this = self.project();
+        match Pin::new(&mut this.fut).poll(cx) {
+            Poll::Ready(Ok(stream)) => Poll::Ready(Ok(TlsStream(stream))),
+            Poll::Ready(Err(err)) => Poll::Ready(Err(TlsError::Tls(err))),
+            Poll::Pending => this.timeout.poll(cx).map(|_| Err(TlsError::Timeout)),
+        }
+    }
+}
--- a/actix-tls/src/connect/mod.rs
+++ b/actix-tls/src/connect/mod.rs
@ -27,8 +27,15 @@ mod uri;
 #[cfg(feature = "openssl")]
 pub mod openssl;

-#[cfg(feature = "rustls")]
-pub mod rustls;
+#[cfg(feature = "rustls-0_20")]
+pub mod rustls_0_20;
+
+#[doc(hidden)]
+#[cfg(feature = "rustls-0_20")]
+pub use rustls_0_20 as rustls;
+
+#[cfg(feature = "rustls-0_21")]
+pub mod rustls_0_21;

 #[cfg(feature = "native-tls")]
 pub mod native_tls;
--- a/actix-tls/src/connect/rustls_0_20.rs
+++ b/actix-tls/src/connect/rustls_0_20.rs
@ -20,22 +20,21 @@ use tokio_rustls::{
    rustls::{client::ServerName, ClientConfig, OwnedTrustAnchor, RootCertStore},
    Connect as RustlsConnect, TlsConnector as RustlsTlsConnector,
 };
-use tracing::trace;
-use webpki_roots::TLS_SERVER_ROOTS;
+use tokio_rustls_023 as tokio_rustls;

 use crate::connect::{Connection, Host};

 pub mod reexports {
    //! Re-exports from `rustls` and `webpki_roots` that are useful for connectors.

-    pub use tokio_rustls::{client::TlsStream as AsyncTlsStream, rustls::ClientConfig};
-    pub use webpki_roots::TLS_SERVER_ROOTS;
+    pub use tokio_rustls_023::{client::TlsStream as AsyncTlsStream, rustls::ClientConfig};
+    pub use webpki_roots_022::TLS_SERVER_ROOTS;
 }

 /// Returns standard root certificates from `webpki-roots` crate as a rustls certificate store.
 pub fn webpki_roots_cert_store() -> RootCertStore {
    let mut root_certs = RootCertStore::empty();
-    for cert in TLS_SERVER_ROOTS.0 {
+    for cert in webpki_roots_022::TLS_SERVER_ROOTS.0 {
        let cert = OwnedTrustAnchor::from_subject_spki_name_constraints(
            cert.subject,
            cert.spki,
@ -102,12 +101,13 @@ where
    actix_service::always_ready!();

    fn call(&self, connection: Connection<R, IO>) -> Self::Future {
-        trace!("TLS handshake start for: {:?}", connection.hostname());
+        tracing::trace!("TLS handshake start for: {:?}", connection.hostname());
        let (stream, connection) = connection.replace_io(());

        match ServerName::try_from(connection.hostname()) {
            Ok(host) => ConnectFut::Future {
-                connect: RustlsTlsConnector::from(self.connector.clone()).connect(host, stream),
+                connect: RustlsTlsConnector::from(Arc::clone(&self.connector))
+                    .connect(host, stream),
                connection: Some(connection),
            },
            Err(_) => ConnectFut::InvalidDns,
@ -117,6 +117,7 @@ where

 /// Connect future for Rustls service.
 #[doc(hidden)]
+#[allow(clippy::large_enum_variant)]
 pub enum ConnectFut<R, IO> {
    /// See issue <https://github.com/briansmith/webpki/issues/54>
    InvalidDns,
@ -131,17 +132,23 @@ where
    R: Host,
    IO: ActixStream,
 {
-    type Output = Result<Connection<R, AsyncTlsStream<IO>>, io::Error>;
+    type Output = io::Result<Connection<R, AsyncTlsStream<IO>>>;

    fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
        match self.get_mut() {
-            Self::InvalidDns => Poll::Ready(Err(
-                io::Error::new(io::ErrorKind::Other, "rustls currently only handles hostname-based connections. See https://github.com/briansmith/webpki/issues/54")
-            )),
-            Self::Future { connect, connection } => {
+            Self::InvalidDns => Poll::Ready(Err(io::Error::new(
+                io::ErrorKind::Other,
+                "Rustls v0.20 can only handle hostname-based connections. Enable the `rustls-0_21` \
+                feature and use the Rustls v0.21 utilities to gain this feature.",
+            ))),
+
+            Self::Future {
+                connect,
+                connection,
+            } => {
                let stream = ready!(Pin::new(connect).poll(cx))?;
                let connection = connection.take().unwrap();
-                trace!("TLS handshake success: {:?}", connection.hostname());
+                tracing::trace!("TLS handshake success: {:?}", connection.hostname());
                Poll::Ready(Ok(connection.replace_io(stream).1))
            }
        }
--- a/actix-tls/src/connect/rustls_0_21.rs
+++ b/actix-tls/src/connect/rustls_0_21.rs
@ -0,0 +1,154 @@
+//! Rustls based connector service.
+//!
+//! See [`TlsConnector`] for main connector service factory docs.
+
+use std::{
+    convert::TryFrom,
+    future::Future,
+    io,
+    pin::Pin,
+    sync::Arc,
+    task::{Context, Poll},
+};
+
+use actix_rt::net::ActixStream;
+use actix_service::{Service, ServiceFactory};
+use actix_utils::future::{ok, Ready};
+use futures_core::ready;
+use tokio_rustls::{
+    client::TlsStream as AsyncTlsStream,
+    rustls::{client::ServerName, ClientConfig, OwnedTrustAnchor, RootCertStore},
+    Connect as RustlsConnect, TlsConnector as RustlsTlsConnector,
+};
+use tokio_rustls_024 as tokio_rustls;
+
+use crate::connect::{Connection, Host};
+
+pub mod reexports {
+    //! Re-exports from `rustls` and `webpki_roots` that are useful for connectors.
+
+    pub use tokio_rustls_024::{client::TlsStream as AsyncTlsStream, rustls::ClientConfig};
+    pub use webpki_roots_025::TLS_SERVER_ROOTS;
+}
+
+/// Returns standard root certificates from `webpki-roots` crate as a rustls certificate store.
+pub fn webpki_roots_cert_store() -> RootCertStore {
+    let mut root_certs = RootCertStore::empty();
+    for cert in webpki_roots_025::TLS_SERVER_ROOTS {
+        let cert = OwnedTrustAnchor::from_subject_spki_name_constraints(
+            cert.subject,
+            cert.spki,
+            cert.name_constraints,
+        );
+        let certs = vec![cert].into_iter();
+        root_certs.add_trust_anchors(certs);
+    }
+    root_certs
+}
+
+/// Connector service factory using `rustls`.
+#[derive(Clone)]
+pub struct TlsConnector {
+    connector: Arc<ClientConfig>,
+}
+
+impl TlsConnector {
+    /// Constructs new connector service factory from a `rustls` client configuration.
+    pub fn new(connector: Arc<ClientConfig>) -> Self {
+        TlsConnector { connector }
+    }
+
+    /// Constructs new connector service from a `rustls` client configuration.
+    pub fn service(connector: Arc<ClientConfig>) -> TlsConnectorService {
+        TlsConnectorService { connector }
+    }
+}
+
+impl<R, IO> ServiceFactory<Connection<R, IO>> for TlsConnector
+where
+    R: Host,
+    IO: ActixStream + 'static,
+{
+    type Response = Connection<R, AsyncTlsStream<IO>>;
+    type Error = io::Error;
+    type Config = ();
+    type Service = TlsConnectorService;
+    type InitError = ();
+    type Future = Ready<Result<Self::Service, Self::InitError>>;
+
+    fn new_service(&self, _: ()) -> Self::Future {
+        ok(TlsConnectorService {
+            connector: self.connector.clone(),
+        })
+    }
+}
+
+/// Connector service using `rustls`.
+#[derive(Clone)]
+pub struct TlsConnectorService {
+    connector: Arc<ClientConfig>,
+}
+
+impl<R, IO> Service<Connection<R, IO>> for TlsConnectorService
+where
+    R: Host,
+    IO: ActixStream,
+{
+    type Response = Connection<R, AsyncTlsStream<IO>>;
+    type Error = io::Error;
+    type Future = ConnectFut<R, IO>;
+
+    actix_service::always_ready!();
+
+    fn call(&self, connection: Connection<R, IO>) -> Self::Future {
+        tracing::trace!("TLS handshake start for: {:?}", connection.hostname());
+        let (stream, connection) = connection.replace_io(());
+
+        match ServerName::try_from(connection.hostname()) {
+            Ok(host) => ConnectFut::Future {
+                connect: RustlsTlsConnector::from(Arc::clone(&self.connector))
+                    .connect(host, stream),
+                connection: Some(connection),
+            },
+            Err(_) => ConnectFut::InvalidServerName,
+        }
+    }
+}
+
+/// Connect future for Rustls service.
+#[doc(hidden)]
+#[allow(clippy::large_enum_variant)]
+pub enum ConnectFut<R, IO> {
+    InvalidServerName,
+    Future {
+        connect: RustlsConnect<IO>,
+        connection: Option<Connection<R, ()>>,
+    },
+}
+
+impl<R, IO> Future for ConnectFut<R, IO>
+where
+    R: Host,
+    IO: ActixStream,
+{
+    type Output = io::Result<Connection<R, AsyncTlsStream<IO>>>;
+
+    fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
+        match self.get_mut() {
+            Self::InvalidServerName => Poll::Ready(Err(io::Error::new(
+                io::ErrorKind::InvalidInput,
+                "connection parameters specified invalid server name",
+            ))),
+
+            Self::Future {
+                connect,
+                connection,
+            } => {
+                let stream = ready!(Pin::new(connect).poll(cx))?;
+                let connection = connection.take().unwrap();
+                tracing::trace!("TLS handshake success: {:?}", connection.hostname());
+                Poll::Ready(Ok(connection.replace_io(stream).1))
+            }
+        }
+    }
+}
--- a/actix-tls/tests/accept-openssl.rs
+++ b/actix-tls/tests/accept-openssl.rs
@ -3,7 +3,7 @@
 #![cfg(all(
    feature = "accept",
    feature = "connect",
-    feature = "rustls",
+    feature = "rustls-0_21",
    feature = "openssl"
 ))]

@ -15,6 +15,7 @@ use actix_service::ServiceFactoryExt as _;
 use actix_tls::accept::openssl::{Acceptor, TlsStream};
 use actix_utils::future::ok;
 use tokio_rustls::rustls::{Certificate, ClientConfig, RootCertStore, ServerName};
+use tokio_rustls_024 as tokio_rustls;

 fn new_cert_and_key() -> (String, String) {
    let cert =
@ -49,7 +50,7 @@ fn openssl_acceptor(cert: String, key: String) -> tls_openssl::ssl::SslAcceptor
 mod danger {
    use std::time::SystemTime;

-    use tokio_rustls::rustls::{
+    use tokio_rustls_024::rustls::{
        self,
        client::{ServerCertVerified, ServerCertVerifier},
    };
--- a/actix-tls/tests/accept-rustls.rs
+++ b/actix-tls/tests/accept-rustls.rs
@ -3,7 +3,7 @@
 #![cfg(all(
    feature = "accept",
    feature = "connect",
-    feature = "rustls",
+    feature = "rustls-0_21",
    feature = "openssl"
 ))]

@ -15,13 +15,14 @@ use actix_rt::net::TcpStream;
 use actix_server::TestServer;
 use actix_service::ServiceFactoryExt as _;
 use actix_tls::{
-    accept::rustls::{Acceptor, TlsStream},
+    accept::rustls_0_21::{Acceptor, TlsStream},
    connect::openssl::reexports::SslConnector,
 };
 use actix_utils::future::ok;
 use rustls_pemfile::{certs, pkcs8_private_keys};
 use tls_openssl::ssl::SslVerifyMode;
 use tokio_rustls::rustls::{self, Certificate, PrivateKey, ServerConfig};
+use tokio_rustls_024 as tokio_rustls;

 fn new_cert_and_key() -> (String, String) {
    let cert =
--- a/actix-tls/tests/test_connect.rs
+++ b/actix-tls/tests/test_connect.rs
@ -30,7 +30,7 @@ async fn test_string() {
    assert_eq!(con.peer_addr().unwrap(), srv.addr());
 }

-#[cfg(feature = "rustls")]
+#[cfg(feature = "rustls-0_21")]
 #[actix_rt::test]
 async fn test_rustls_string() {
    let srv = TestServer::start(|| {
@ -114,7 +114,7 @@ async fn test_openssl_uri() {
    assert_eq!(con.peer_addr().unwrap(), srv.addr());
 }

-#[cfg(all(feature = "rustls", feature = "uri"))]
+#[cfg(all(feature = "rustls-0_21", feature = "uri"))]
 #[actix_rt::test]
 async fn test_rustls_uri() {
    use std::convert::TryFrom;
--- a/actix-utils/src/counter.rs
+++ b/actix-utils/src/counter.rs
@ -29,7 +29,7 @@ impl Counter {

    /// Returns true if counter is below capacity. Otherwise, register to wake task when it is.
    #[inline]
-    pub fn available(&self, cx: &mut task::Context<'_>) -> bool {
+    pub fn available(&self, cx: &task::Context<'_>) -> bool {
        self.0.available(cx)
    }

@ -59,7 +59,7 @@ impl CounterInner {
        }
    }

-    fn available(&self, cx: &mut task::Context<'_>) -> bool {
+    fn available(&self, cx: &task::Context<'_>) -> bool {
        if self.count.get() < self.capacity {
            true
        } else {
--- a/actix-utils/src/future/poll_fn.rs
+++ b/actix-utils/src/future/poll_fn.rs
@ -62,6 +62,7 @@ where
    fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
        // SAFETY: we are not moving out of the pinned field
        // see https://github.com/rust-lang/rust/pull/102737
+        #[allow(clippy::needless_borrow)]
        (unsafe { &mut self.get_unchecked_mut().f })(cx)
    }
 }