Github user geek101 commented on a diff in the pull request:

    https://github.com/apache/zookeeper/pull/184#discussion_r108835534
  
    --- Diff: src/java/main/org/apache/zookeeper/common/X509Util.java ---
    @@ -214,45 +237,56 @@ public static X509TrustManager 
createTrustManager(String trustStoreLocation, Str
                 tmf.init(new CertPathTrustManagerParameters(pbParams));
     
                 for (final TrustManager tm : tmf.getTrustManagers()) {
    -                if (tm instanceof X509TrustManager) {
    +                if (tm instanceof X509ExtendedTrustManager) {
                         return new X509ExtendedTrustManager() {
    -                        HostnameChecker hostnameChecker = 
HostnameChecker.getInstance(HostnameChecker.TYPE_TLS);
    +                        X509ExtendedTrustManager x509ExtendedTrustManager 
= (X509ExtendedTrustManager) tm;
    +                        HostnameVerifier hostnameVerifier = new 
DefaultHostnameVerifier();
     
                             @Override
                             public X509Certificate[] getAcceptedIssuers() {
    -                            return ((X509ExtendedTrustManager) 
tm).getAcceptedIssuers();
    +                            return 
x509ExtendedTrustManager.getAcceptedIssuers();
                             }
     
                             @Override
    -                        public void checkClientTrusted(X509Certificate[] 
x509Certificates, String s, Socket socket) throws CertificateException {
    -                            
hostnameChecker.match(socket.getInetAddress().getHostName(), 
x509Certificates[0]);
    -                            ((X509ExtendedTrustManager) 
tm).checkClientTrusted(x509Certificates, s, socket);
    +                        public void checkClientTrusted(X509Certificate[] 
chain, String authType, Socket socket) throws CertificateException {
    +                            if (hostnameVerificationEnabled && 
shouldVerifyClientHostname) {
    +                                
hostnameVerifier.verify(socket.getInetAddress().getHostName(), ((SSLSocket) 
socket).getSession());
    --- End diff --
    
    Will the hostname be available on the server side to verify?. How will the 
server know who this client is, one way is to implement a special 
HostnameVerifier that can be provide a set of peer hostnames or refer back to 
QuorumPeer to verify using the QuorumVerifier?.


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