diff --git a/src/server.rs b/src/server.rs
index 1c1438d..191f6b7 100644
--- a/src/server.rs
+++ b/src/server.rs
@@ -5,7 +5,7 @@ use crate::rusttls::stream::Stream;
 
 use futures_core::ready;
 use futures_io::{AsyncRead, AsyncWrite};
-use rustls::ServerSession;
+use rustls::{Certificate, ServerSession};
 use std::future::Future;
 use std::pin::Pin;
 use std::task::{Context, Poll};
@@ -22,6 +22,16 @@ pub struct TlsStream<IO> {
     pub(crate) state: TlsState,
 }
 
+impl<IO> TlsStream<IO> {
+    /// Retrieves the certificate chain used by the client,
+    /// if client authentication was completed.
+    ///
+    /// The return value is None until this value is available.
+    pub fn client_certificates(&self) -> Option<Vec<Certificate>> {
+        self.session.get_peer_certificates()
+    }
+}
+
 pub(crate) enum MidHandshake<IO> {
     Handshaking(TlsStream<IO>),
     End,