fix: migrate from rustls-pemfile to rustls-pki-types

Replace deprecated rustls-pemfile with rustls-pki-types PemObject API.
The rustls-pemfile crate is unmaintained.

- Use CertificateDer::pem_slice_iter() for certificate parsing
- Use PrivateKeyDer::from_pem_slice() for key parsing
- Remove rustls-pemfile dependency
- Remove obsolete first_private_key_in_pemfile() helper function

Closes #1010
Fixes RUSTSEC-2025-0134

Author: f-did

Cargo.lock

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 ### Changed
+- Migrated from deprecated `rustls-pemfile` to `rustls-pki-types` PEM parsing API
 ### Deprecated
 ### Removed
 ### Fixed 

rumqttc/CHANGELOG.md

@@ -18,7 +18,7 @@ rustdoc-args = ["--cfg", "docsrs"]
 [features]
 default = ["use-rustls"]
 use-rustls = ["use-rustls-no-provider", "tokio-rustls/default"]
-use-rustls-no-provider = ["dep:tokio-rustls", "dep:rustls-webpki", "dep:rustls-pemfile", "dep:rustls-native-certs"]
+use-rustls-no-provider = ["dep:tokio-rustls", "dep:rustls-webpki", "dep:rustls-native-certs"]
 use-native-tls = ["dep:tokio-native-tls", "dep:native-tls"]
 websocket = ["dep:async-tungstenite", "dep:ws_stream_tungstenite", "dep:http"]
 proxy = ["dep:async-http-proxy"]
@@ -36,7 +36,6 @@ thiserror = "2.0.8"
 # rustls
 tokio-rustls = { version = "0.26.0", optional = true, default-features = false }
 rustls-webpki = { version = "0.102.8", optional = true }
-rustls-pemfile = { version = "2.2.0", optional = true }
 rustls-native-certs = { version = "0.8.1", optional = true }
 # websockets
 async-tungstenite = { version = "0.29.0", default-features = false, features = ["tokio-rustls-native-certs"], optional = true }

rumqttc/Cargo.toml

@@ -1,9 +1,10 @@
 #[cfg(feature = "use-rustls-no-provider")]
-use rustls_pemfile::Item;
-#[cfg(feature = "use-rustls-no-provider")]
 use tokio_rustls::rustls::{
     self,
-    pki_types::{InvalidDnsNameError, ServerName},
+    pki_types::{
+        pem::Error as PemError, pem::PemObject, CertificateDer, InvalidDnsNameError, PrivateKeyDer,
+        ServerName,
+    },
     ClientConfig, RootCertStore,
 };
 #[cfg(feature = "use-rustls-no-provider")]
@@ -12,8 +13,6 @@ use tokio_rustls::TlsConnector as RustlsConnector;
 #[cfg(feature = "use-rustls-no-provider")]
 use std::convert::TryFrom;
 #[cfg(feature = "use-rustls-no-provider")]
-use std::io::{BufReader, Cursor};
-#[cfg(feature = "use-rustls-no-provider")]
 use std::sync::Arc;
 
 use crate::framed::AsyncReadWrite;
@@ -60,6 +59,10 @@ pub enum Error {
     /// No valid key found
     #[error("No valid key in chain")]
     NoValidKeyInChain,
+    #[cfg(feature = "use-rustls-no-provider")]
+    /// PEM parsing error
+    #[error("PEM parsing error: {0}")]
+    Pem(#[from] PemError),
     #[cfg(feature = "use-native-tls")]
     #[error("Native TLS error {0}")]
     NativeTls(#[from] NativeTlsError),
@@ -75,8 +78,8 @@ pub async fn rustls_connector(tls_config: &TlsConfiguration) -> Result<RustlsCon
         } => {
             // Add ca to root store if the connection is TLS
             let mut root_cert_store = RootCertStore::empty();
-            let certs = rustls_pemfile::certs(&mut BufReader::new(Cursor::new(ca)))
-                .collect::<Result<Vec<_>, _>>()?;
+            let certs: Vec<CertificateDer> =
+                CertificateDer::pem_slice_iter(ca).collect::<Result<Vec<_>, _>>()?;
 
             root_cert_store.add_parsable_certificates(certs);
 
@@ -88,34 +91,14 @@ pub async fn rustls_connector(tls_config: &TlsConfiguration) -> Result<RustlsCon
 
             // Add der encoded client cert and key
             let mut config = if let Some(client) = client_auth.as_ref() {
-                let certs =
-                    rustls_pemfile::certs(&mut BufReader::new(Cursor::new(client.0.clone())))
-                        .collect::<Result<Vec<_>, _>>()?;
+                let certs: Vec<CertificateDer> =
+                    CertificateDer::pem_slice_iter(&client.0).collect::<Result<Vec<_>, _>>()?;
+
                 if certs.is_empty() {
                     return Err(Error::NoValidClientCertInChain);
                 }
 
-                // Create buffer for key file
-                let mut key_buffer = BufReader::new(Cursor::new(client.1.clone()));
-
-                // Read PEM items until we find a valid key.
-                let key = loop {
-                    let item = rustls_pemfile::read_one(&mut key_buffer)?;
-                    match item {
-                        Some(Item::Sec1Key(key)) => {
-                            break key.into();
-                        }
-                        Some(Item::Pkcs1Key(key)) => {
-                            break key.into();
-                        }
-                        Some(Item::Pkcs8Key(key)) => {
-                            break key.into();
-                        }
-                        None => return Err(Error::NoValidKeyInChain),
-                        _ => {}
-                    }
-                };
-
+                let key = PrivateKeyDer::from_pem_slice(&client.1)?;
                 config.with_client_auth_cert(certs, key)?
             } else {
                 config.with_no_client_auth()

rumqttc/src/tls.rs

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 ### Changed
+- Migrated from deprecated `rustls-pemfile` to `rustls-pki-types` PEM parsing API
 ### Deprecated
 ### Removed
 ### Fixed 

rumqttd/CHANGELOG.md

@@ -23,7 +23,6 @@ tokio-util = { version = "0.7", features = ["codec"], optional = true }
 tokio-rustls = { version = "0.25.0", optional = true }
 rustls-webpki = { version = "0.102.2", optional = true }
 tokio-native-tls = { version = "0.3.1", optional = true }
-rustls-pemfile = { version = "2.1.0", optional = true }
 async-tungstenite = { version = "0.25", default-features = false, features = ["tokio-runtime"], optional = true }
 ws_stream_tungstenite = { version= "0.13", default-features = false, features = ["tokio_io"], optional = true }
 x509-parser = {version= "0.15.1", optional = true}
@@ -42,7 +41,7 @@ subtle = "2.5"
 
 [features]
 default = ["use-rustls", "websocket"]
-use-rustls = ["dep:tokio-rustls", "dep:rustls-webpki", "dep:rustls-pemfile", "dep:x509-parser"]
+use-rustls = ["dep:tokio-rustls", "dep:rustls-webpki", "dep:x509-parser"]
 use-native-tls = ["dep:tokio-native-tls", "dep:x509-parser"]
 websocket = ["dep:async-tungstenite", "dep:tokio-util", "dep:futures-util", "dep:ws_stream_tungstenite"]
 verify-client-cert = []

rumqttd/Cargo.toml

@@ -1,12 +1,7 @@
 use flume::Sender;
 
 #[cfg(feature = "use-rustls")]
-use std::{
-    fs,
-    io::{BufReader, Cursor},
-    path::Path,
-    sync::Arc,
-};
+use std::{fs, path::Path, sync::Arc};
 
 use std::{io, net::AddrParseError, time::Duration};
 
@@ -15,13 +10,13 @@ use tokio::{
     time::{sleep, sleep_until, Instant},
 };
 
-#[cfg(feature = "use-rustls")]
-use rustls_pemfile::Item;
-
 #[cfg(feature = "use-rustls")]
 use tokio_rustls::{
     rustls::{
-        pki_types::{InvalidDnsNameError, ServerName},
+        pki_types::{
+            pem::Error as PemError, pem::PemObject, CertificateDer, InvalidDnsNameError,
+            PrivateKeyDer, ServerName,
+        },
         ClientConfig, Error as TLSError, RootCertStore,
     },
     TlsConnector,
@@ -203,9 +198,11 @@ pub async fn tls_connect<P: AsRef<Path>>(
 ) -> Result<Box<dyn N>, BridgeError> {
     let mut root_cert_store = RootCertStore::empty();
 
-    for cert in rustls_pemfile::certs(&mut BufReader::new(Cursor::new(fs::read(ca_file)?))) {
-        root_cert_store.add(cert?)?;
-    }
+    let ca_pem = fs::read(ca_file)?;
+    let certs: Vec<CertificateDer> =
+        CertificateDer::pem_slice_iter(&ca_pem).collect::<Result<Vec<_>, _>>()?;
+
+    root_cert_store.add_parsable_certificates(certs);
 
     if root_cert_store.is_empty() {
         return Err(BridgeError::NoValidCertInChain);
@@ -218,18 +215,12 @@ pub async fn tls_connect<P: AsRef<Path>>(
         key: key_path,
     }) = client_auth_opt
     {
-        let certs = rustls_pemfile::certs(&mut BufReader::new(Cursor::new(fs::read(certs_path)?)))
-            .collect::<Result<Vec<_>, _>>()?;
-
-        let key = loop {
-            match rustls_pemfile::read_one(&mut BufReader::new(Cursor::new(fs::read(key_path)?)))? {
-                Some(Item::Pkcs1Key(key)) => break key.into(),
-                Some(Item::Pkcs8Key(key)) => break key.into(),
-                Some(Item::Sec1Key(key)) => break key.into(),
-                None => return Err(BridgeError::NoValidCertInChain),
-                _ => {}
-            };
-        };
+        let certs_pem = fs::read(certs_path)?;
+        let certs: Vec<CertificateDer> =
+            CertificateDer::pem_slice_iter(&certs_pem).collect::<Result<Vec<_>, _>>()?;
+
+        let key_pem = fs::read(key_path)?;
+        let key = PrivateKeyDer::from_pem_slice(&key_pem)?;
 
         config.with_client_auth_cert(certs, key)?
     } else {
@@ -319,4 +310,7 @@ pub enum BridgeError {
     #[cfg(feature = "use-rustls")]
     #[error("Invalid trust_anchor")]
     NoValidCertInChain,
+    #[cfg(feature = "use-rustls")]
+    #[error("PEM parsing error: {0}")]
+    Pem(#[from] PemError),
 }

rumqttd/src/link/bridge.rs

@@ -1,4 +1,3 @@
-use std::fs::File;
 use tokio::net::TcpStream;
 
 #[cfg(feature = "use-native-tls")]
@@ -12,9 +11,11 @@ use crate::TlsConfig;
 use tokio_rustls::rustls::{server::WebPkiClientVerifier, RootCertStore};
 #[cfg(feature = "use-rustls")]
 use {
-    rustls_pemfile::Item,
-    std::{io::BufReader, sync::Arc},
-    tokio_rustls::rustls::{pki_types::PrivateKeyDer, Error as RustlsError, ServerConfig},
+    std::sync::Arc,
+    tokio_rustls::rustls::{
+        pki_types::{pem::PemObject, CertificateDer, PrivateKeyDer},
+        Error as RustlsError, ServerConfig,
+    },
     tracing::error,
 };
 
@@ -198,14 +199,18 @@ impl TLSAcceptor {
 
         let (certs, key) = {
             // Get certificates
-            let cert_file = File::open(cert_path);
-            let cert_file = cert_file.map_err(|_| Error::ServerCertNotFound(cert_path.clone()))?;
-            let certs = rustls_pemfile::certs(&mut BufReader::new(cert_file))
+
+            let cert_pem = std::fs::read(cert_path)
+                .map_err(|_| Error::ServerCertNotFound(cert_path.clone()))?;
+            let certs: Vec<CertificateDer> = CertificateDer::pem_slice_iter(&cert_pem)
                 .collect::<Result<Vec<_>, _>>()
                 .map_err(|_| Error::InvalidServerCert(cert_path.to_string()))?;
 
             // Get private key
-            let key = first_private_key_in_pemfile(key_path)?;
+            let key_pem =
+                std::fs::read(key_path).map_err(|_| Error::ServerKeyNotFound(key_path.clone()))?;
+            let key = PrivateKeyDer::from_pem_slice(&key_pem)
+                .map_err(|_| Error::InvalidServerKey(key_path.to_string()))?;
 
             (certs, key)
         };
@@ -245,38 +250,3 @@ impl TLSAcceptor {
         Ok(TLSAcceptor::Rustls { acceptor })
     }
 }
-
-#[cfg(feature = "use-rustls")]
-/// Get the first private key in a PEM file
-fn first_private_key_in_pemfile(key_path: &String) -> Result<PrivateKeyDer<'static>, Error> {
-    // Get private key
-    let key_file = File::open(key_path);
-    let key_file = key_file.map_err(|_| Error::ServerKeyNotFound(key_path.clone()))?;
-
-    let rd = &mut BufReader::new(key_file);
-
-    // keep reading Items one by one to find a Key, return error if none found.
-    loop {
-        let item = rustls_pemfile::read_one(rd).map_err(|err| {
-            error!("Error reading key file: {:?}", err);
-            Error::InvalidServerKey(key_path.clone())
-        })?;
-
-        match item {
-            Some(Item::Sec1Key(key)) => {
-                return Ok(key.into());
-            }
-            Some(Item::Pkcs1Key(key)) => {
-                return Ok(key.into());
-            }
-            Some(Item::Pkcs8Key(key)) => {
-                return Ok(key.into());
-            }
-            None => {
-                error!("No private key found in {:?}", key_path);
-                return Err(Error::InvalidServerKey(key_path.clone()));
-            }
-            _ => {}
-        }
-    }
-}