Take rustls 0.23

rustls 0.21 is EOL for security support at the end of March 2025.

- Drop rustls-pemfile, as it is now incorporated into rustls-pki-types;
  use the new iterator-based API.
- Use the ring-based provider, to align with previous version's build-time
  requirements.

Author: ctz

Cargo.toml

@@ -31,7 +31,7 @@ exclude = [
 default = ["compat-3-0-0", "rustls-tls", "dns-resolver"]
 compat-3-0-0 = []
 sync = []
-rustls-tls = ["dep:rustls", "dep:rustls-pemfile", "dep:tokio-rustls"]
+rustls-tls = ["dep:rustls", "dep:tokio-rustls"]
 openssl-tls = ["dep:openssl", "dep:openssl-probe", "dep:tokio-openssl"]
 dns-resolver = ["dep:hickory-resolver", "dep:hickory-proto"]
 cert-key-password = ["dep:pem", "dep:pkcs8"]
@@ -102,7 +102,6 @@ pkcs8 = { version = "0.10.2", features = ["encryption", "pkcs5"], optional = tru
 rand = { version = "0.8.3", features = ["small_rng"] }
 rayon = { version = "1.5.3", optional = true }
 rustc_version_runtime = "0.3.0"
-rustls-pemfile = { version = "1.0.1", optional = true }
 serde_with = "3.8.1"
 sha-1 = "0.10.0"
 sha2 = "0.10.2"
@@ -115,7 +114,7 @@ thiserror = "1.0.24"
 tokio-openssl = { version = "0.6.3", optional = true }
 tracing = { version = "0.1.36", optional = true }
 typed-builder = "0.10.0"
-webpki-roots = "0.25.2"
+webpki-roots = "0.26"
 zstd = { version = "0.11.2", optional = true }
 macro_magic = "0.5.1"
 
@@ -130,9 +129,10 @@ default-features = false
 features = ["json", "rustls-tls"]
 
 [dependencies.rustls]
-version = "0.21.6"
+version = "0.23.20"
 optional = true
-features = ["dangerous_configuration"]
+default-features = false
+features = ["logging", "ring", "std", "tls12"]
 
 [dependencies.serde]
 version = "1.0.125"
@@ -146,9 +146,10 @@ version = "1.17.0"
 features = ["io-util", "sync", "macros", "net", "process", "rt", "time", "fs"]
 
 [dependencies.tokio-rustls]
-version = "0.24.1"
+version = "0.26"
 optional = true
-features = ["dangerous_configuration"]
+default-features = false
+features = ["logging", "ring", "tls12"]
 
 [dependencies.tokio-util]
 version = "0.7.0"

src/runtime/tls_rustls.rs

@@ -3,17 +3,15 @@ use std::{
     fs::File,
     io::{BufReader, Seek},
     sync::Arc,
-    time::SystemTime,
 };
 
 use rustls::{
-    client::{ClientConfig, ServerCertVerified, ServerCertVerifier, ServerName},
-    Certificate,
+    client::ClientConfig,
+    crypto::ring as provider,
+    pki_types::{pem::PemObject, CertificateDer, PrivateKeyDer, ServerName},
     Error as TlsError,
-    OwnedTrustAnchor,
     RootCertStore,
 };
-use rustls_pemfile::{certs, read_one, Item};
 use tokio::net::TcpStream;
 use tokio_rustls::TlsConnector;
 use webpki_roots::TLS_SERVER_ROOTS;
@@ -49,9 +47,11 @@ pub(super) async fn tls_connect(
     tcp_stream: TcpStream,
     cfg: &TlsConfig,
 ) -> Result<TlsStream> {
-    let name = ServerName::try_from(host).map_err(|e| ErrorKind::DnsResolve {
-        message: format!("could not resolve {:?}: {}", host, e),
-    })?;
+    let name = ServerName::try_from(host)
+        .map_err(|e| ErrorKind::DnsResolve {
+            message: format!("could not resolve {:?}: {}", host, e),
+        })?
+        .to_owned();
 
     let conn = cfg
         .connector
@@ -66,110 +66,141 @@ pub(super) async fn tls_connect(
 fn make_rustls_config(cfg: TlsOptions) -> Result<rustls::ClientConfig> {
     let mut store = RootCertStore::empty();
     if let Some(path) = cfg.ca_file_path {
-        let ders = certs(&mut BufReader::new(File::open(&path)?)).map_err(|_| {
-            ErrorKind::InvalidTlsConfig {
+        let ders = CertificateDer::pem_file_iter(&path)
+            .map_err(|err| ErrorKind::InvalidTlsConfig {
                 message: format!(
-                    "Unable to parse PEM-encoded root certificate from {}",
+                    "Unable to parse PEM-encoded root certificate from {}: {err}",
                     path.display()
                 ),
-            }
-        })?;
-        store.add_parsable_certificates(&ders);
+            })?
+            .flatten();
+        store.add_parsable_certificates(ders);
     } else {
-        let trust_anchors = TLS_SERVER_ROOTS.iter().map(|ta| {
-            OwnedTrustAnchor::from_subject_spki_name_constraints(
-                ta.subject,
-                ta.spki,
-                ta.name_constraints,
-            )
-        });
-        store.add_trust_anchors(trust_anchors);
+        store.extend(TLS_SERVER_ROOTS.iter().cloned());
     }
 
+    let config_builder = ClientConfig::builder_with_provider(provider::default_provider().into())
+        .with_safe_default_protocol_versions()
+        .expect("built-in provider should support default protocol versions")
+        .with_root_certificates(store);
+
     let mut config = if let Some(path) = cfg.cert_key_file_path {
         let mut file = BufReader::new(File::open(&path)?);
-        let certs = match certs(&mut file) {
-            Ok(certs) => certs.into_iter().map(Certificate).collect(),
-            Err(error) => {
-                return Err(ErrorKind::InvalidTlsConfig {
-                    message: format!(
-                        "Unable to parse PEM-encoded client certificate from {}: {}",
-                        path.display(),
-                        error,
-                    ),
-                }
-                .into())
-            }
-        };
+        let mut certs = vec![];
+
+        for cert in CertificateDer::pem_reader_iter(&mut file) {
+            let cert = cert.map_err(|error| ErrorKind::InvalidTlsConfig {
+                message: format!(
+                    "Unable to parse PEM-encoded client certificate from {}: {error}",
+                    path.display(),
+                ),
+            })?;
+            certs.push(cert);
+        }
 
         file.rewind()?;
         let key = loop {
             #[cfg(feature = "cert-key-password")]
             if let Some(key_pw) = cfg.tls_certificate_key_file_password.as_deref() {
+                use rustls::pki_types::PrivatePkcs8KeyDer;
                 use std::io::Read;
                 let mut contents = vec![];
                 file.read_to_end(&mut contents)?;
-                break rustls::PrivateKey(super::pem::decrypt_private_key(&contents, key_pw)?);
+                break PrivatePkcs8KeyDer::from(super::pem::decrypt_private_key(
+                    &contents, key_pw,
+                )?)
+                .into();
             }
-            match read_one(&mut file) {
-                Ok(Some(Item::PKCS8Key(bytes))) | Ok(Some(Item::RSAKey(bytes))) => {
-                    break rustls::PrivateKey(bytes)
-                }
-                Ok(Some(_)) => continue,
-                Ok(None) => {
-                    return Err(ErrorKind::InvalidTlsConfig {
-                        message: format!("No PEM-encoded keys in {}", path.display()),
-                    }
-                    .into())
-                }
-                Err(_) => {
+            match PrivateKeyDer::from_pem_reader(&mut file) {
+                Ok(key) => break key,
+                Err(err) => {
                     return Err(ErrorKind::InvalidTlsConfig {
                         message: format!(
-                            "Unable to parse PEM-encoded item from {}",
-                            path.display()
+                            "Unable to parse PEM-encoded item from {}: {err}",
+                            path.display(),
                         ),
                     }
                     .into())
                 }
             }
         };
 
-        ClientConfig::builder()
-            .with_safe_defaults()
-            .with_root_certificates(store)
+        config_builder
             .with_client_auth_cert(certs, key)
             .map_err(|error| ErrorKind::InvalidTlsConfig {
                 message: error.to_string(),
             })?
     } else {
-        ClientConfig::builder()
-            .with_safe_defaults()
-            .with_root_certificates(store)
-            .with_no_client_auth()
+        config_builder.with_no_client_auth()
     };
 
     if let Some(true) = cfg.allow_invalid_certificates {
         // nosemgrep: rustls-dangerous
         config // mongodb rating: No Fix Needed
             .dangerous()
-            .set_certificate_verifier(Arc::new(NoCertVerifier {}));
+            .set_certificate_verifier(Arc::new(danger::NoCertVerifier(
+                provider::default_provider(),
+            )));
     }
 
     Ok(config)
 }
 
-struct NoCertVerifier {}
-
-impl ServerCertVerifier for NoCertVerifier {
-    fn verify_server_cert(
-        &self,
-        _: &Certificate,
-        _: &[Certificate],
-        _: &ServerName,
-        _: &mut dyn Iterator<Item = &[u8]>,
-        _: &[u8],
-        _: SystemTime,
-    ) -> std::result::Result<ServerCertVerified, TlsError> {
-        Ok(ServerCertVerified::assertion())
+mod danger {
+    use super::*;
+    use rustls::{
+        client::danger::{HandshakeSignatureValid, ServerCertVerified, ServerCertVerifier},
+        crypto::{verify_tls12_signature, verify_tls13_signature, CryptoProvider},
+        pki_types::UnixTime,
+        DigitallySignedStruct,
+        SignatureScheme,
+    };
+
+    #[derive(Debug)]
+    pub(super) struct NoCertVerifier(pub(super) CryptoProvider);
+
+    impl ServerCertVerifier for NoCertVerifier {
+        fn verify_server_cert(
+            &self,
+            _end_entity: &CertificateDer<'_>,
+            _intermediates: &[CertificateDer<'_>],
+            _server_name: &ServerName<'_>,
+            _ocsp: &[u8],
+            _now: UnixTime,
+        ) -> std::result::Result<ServerCertVerified, TlsError> {
+            Ok(ServerCertVerified::assertion())
+        }
+
+        fn verify_tls12_signature(
+            &self,
+            message: &[u8],
+            cert: &CertificateDer<'_>,
+            dss: &DigitallySignedStruct,
+        ) -> std::result::Result<HandshakeSignatureValid, TlsError> {
+            verify_tls12_signature(
+                message,
+                cert,
+                dss,
+                &self.0.signature_verification_algorithms,
+            )
+        }
+
+        fn verify_tls13_signature(
+            &self,
+            message: &[u8],
+            cert: &CertificateDer<'_>,
+            dss: &DigitallySignedStruct,
+        ) -> std::result::Result<HandshakeSignatureValid, TlsError> {
+            verify_tls13_signature(
+                message,
+                cert,
+                dss,
+                &self.0.signature_verification_algorithms,
+            )
+        }
+
+        fn supported_verify_schemes(&self) -> Vec<SignatureScheme> {
+            self.0.signature_verification_algorithms.supported_schemes()
+        }
     }
 }