feat(server): make TlsIdentityCtx accept PEM files

This is in general more convenient than DER files.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>

Author: elmarco

crates/ironrdp-server/src/helper.rs

@@ -5,23 +5,44 @@ use std::sync::Arc;
 
 use anyhow::Context;
 use rustls_pemfile::{certs, pkcs8_private_keys};
-use tokio_rustls::{rustls, TlsAcceptor};
+use tokio_rustls::rustls::pki_types::pem::PemObject;
+use tokio_rustls::rustls::pki_types::{CertificateDer, PrivateKeyDer};
+use tokio_rustls::rustls::{self};
+use tokio_rustls::TlsAcceptor;
 
 pub struct TlsIdentityCtx {
-    pub cert: rustls::pki_types::CertificateDer<'static>,
-    pub priv_key: rustls::pki_types::PrivateKeyDer<'static>,
+    pub certs: Vec<CertificateDer<'static>>,
+    pub priv_key: PrivateKeyDer<'static>,
     pub pub_key: Vec<u8>,
 }
 
 impl TlsIdentityCtx {
+    /// A constructor to create a `TlsIdentityCtx` from the given certificate and key paths.
+    ///
+    /// The file format can be either PEM (if the file extension ends with .pem) or DER.
     pub fn init_from_paths(cert_path: &Path, key_path: &Path) -> anyhow::Result<Self> {
-        use x509_cert::der::Decode as _;
+        let certs: Vec<_> = if cert_path.extension().map_or(false, |ext| ext == "pem") {
+            CertificateDer::pem_file_iter(cert_path)
+                .context(format!("reading server cert `{cert_path:?}`"))?
+                .map(|cert| cert.unwrap())
+                .collect()
+        } else {
+            certs(&mut BufReader::new(File::open(cert_path)?)).collect::<Result<_, _>>()?
+        };
 
-        let cert = certs(&mut BufReader::new(File::open(cert_path)?))
-            .next()
-            .context("no certificate")??;
+        let priv_key = if key_path.extension().map_or(false, |ext| ext == "pem") {
+            PrivateKeyDer::from_pem_file(key_path).context("reading server key `{key_path:?}`")?
+        } else {
+            pkcs8_private_keys(&mut BufReader::new(File::open(key_path)?))
+                .next()
+                .context("no private key")?
+                .map(PrivateKeyDer::from)?
+        };
 
         let pub_key = {
+            use x509_cert::der::Decode as _;
+
+            let cert = certs.first().ok_or_else(|| std::io::Error::other("invalid cert"))?;
             let cert = x509_cert::Certificate::from_der(&cert).map_err(std::io::Error::other)?;
             cert.tbs_certificate
                 .subject_public_key_info
@@ -31,13 +52,8 @@ impl TlsIdentityCtx {
                 .to_owned()
         };
 
-        let priv_key = pkcs8_private_keys(&mut BufReader::new(File::open(key_path)?))
-            .next()
-            .context("no private key")?
-            .map(rustls::pki_types::PrivateKeyDer::from)?;
-
         Ok(Self {
-            cert,
+            certs,
             priv_key,
             pub_key,
         })
@@ -46,7 +62,7 @@ impl TlsIdentityCtx {
     pub fn make_acceptor(&self) -> anyhow::Result<TlsAcceptor> {
         let mut server_config = rustls::ServerConfig::builder()
             .with_no_client_auth()
-            .with_single_cert(vec![self.cert.clone()], self.priv_key.clone_key())
+            .with_single_cert(self.certs.clone(), self.priv_key.clone_key())
             .context("bad certificate/key")?;
 
         // This adds support for the SSLKEYLOGFILE env variable (https://wiki.wireshark.org/TLS#using-the-pre-master-secret)