Enable client certificates in SecureSocket and SecureServerSocket

tests/standalone/io/secure_server_client_certificate_test.dart

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import "dart:io";
 import "dart:isolate";
 
 const SERVER_ADDRESS = "127.0.0.1";
 const HOST_NAME = "localhost";
 
 void WriteAndClose(Socket socket, String message) {
   var data = message.charCodes;
   int written = 0;
   void write() {
     written += socket.writeList(data, written, data.length - written);
     if (written < data.length) {
       socket.onWrite = write;
     } else {
       socket.close(true);
     }
   }
   write();
 }
 
 class SecureTestServer {
   void onConnection(Socket connection) {
     connection.onConnect = () {
       numConnections++;
+      var certificate = connection.peerCertificate;
+      Expect.isTrue(certificate.subject.contains("CN="));
     };
     String received = "";
     connection.onData = () {
       received = received.concat(new String.fromCharCodes(connection.read()));
     };
     connection.onClosed = () {
       Expect.isTrue(received.contains("Hello from client "));
       String name = received.substring(received.indexOf("client ") + 7);
       WriteAndClose(connection, "Welcome, client $name");
     };
   }
 
   void errorHandlerServer(Exception e) {
     Expect.fail("Server socket error $e");
   }
 
   int start() {
-    server = new SecureServerSocket(SERVER_ADDRESS, 0, 10, "CN=$HOST_NAME");
+    server = new SecureServerSocket(SERVER_ADDRESS,
+                                    0,
+                                    10,
+                                    "CN=$HOST_NAME",
+                                    requireClientCertificate: true);
     Expect.isNotNull(server);
     server.onConnection = onConnection;
     server.onError = errorHandlerServer;
     return server.port;
   }
 
   void stop() {
     server.close();
   }
 
   int numConnections = 0;
   SecureServerSocket server;
 }
 
 class SecureTestClient {
   SecureTestClient(int this.port, String this.name) {
-    socket = new SecureSocket(HOST_NAME, port);
+    socket = new SecureSocket(HOST_NAME, port, sendClientCertificate: true);
     socket.onConnect = this.onConnect;
     socket.onData = () {
       reply = reply.concat(new String.fromCharCodes(socket.read()));
     };
     socket.onClosed = done;
     reply = "";
   }
 
   void onConnect() {
     numRequests++;
@@ skipping 20 matching lines @@
 
 Function EndTest;
 
 const CLIENT_NAMES = const ['able', 'baker', 'camera', 'donut', 'echo'];
 
 void main() {
   ReceivePort keepAlive = new ReceivePort();
   Path scriptDir = new Path.fromNative(new Options().script).directoryPath;
   Path certificateDatabase = scriptDir.append('pkcert');
   SecureSocket.initialize(database: certificateDatabase.toNativePath(),
-                          password: 'dartdart');
+                          password: 'dartdart',
+                          useBuiltinRoots: false);
 
   var server = new SecureTestServer();
   int port = server.start();
 
   EndTest = () {
     Expect.equals(CLIENT_NAMES.length, server.numConnections);
     server.stop();
     keepAlive.close();
   };
 
   for (var x in CLIENT_NAMES) {
     new SecureTestClient(port, x);
   }
 }