HttpClient：对每个请求进行 ssl 握手

Question

我使用静态 HttpClient，它在 https 上运行非常缓慢。我添加了 -Djavax.net.debug=ssl 并发现再次为每个 https 请求开始握手。看起来它不能重用旧会话，但我找不到原因。

9007199254743735, setSoTimeout(0) called
Allow unsafe renegotiation: false
Allow legacy hello messages: true
Is initial handshake: true
Is secure renegotiation: false
9007199254743735, setSoTimeout(0) called
%% No cached client session
*** ClientHello, SSLv3
...
%% Didn't cache non-resumable client session: [Session-1, SSL_RSA_WITH_RC4_128_MD5]
...
Is initial handshake: true

顺便提一句。在我在这台主机上遇到另一个问题：“收到致命警报：bad_record_mac”之前，它通过只允许 SSLv3 解决了

UPD1：HttpClient 初始化代码

    final SSLContext sslCtx;
    sslCtx = SSLContext.getInstance("SSL");
    sslCtx.init(null, new TrustManager[]{new X509TrustManager() {
            @Override
            public void checkClientTrusted(X509Certificate[] cert,
                    String authType) {
            }

            @Override
            public void checkServerTrusted(X509Certificate[] cert,
                    String authType) {
            }

            @Override
            public X509Certificate[] getAcceptedIssuers() {
                return null;
            }
        }}, null);

    X509HostnameVerifier verifier = new X509HostnameVerifier() {
        @Override
        public void verify(String string, SSLSocket ssls) throws IOException {
        }

        @Override
        public void verify(String string, X509Certificate xc) throws SSLException {
        }

        @Override
        public void verify(String string, String[] strings, String[] strings1) throws SSLException {
        }

        @Override
        public boolean verify(String string, SSLSession ssls) {
            return true;
        }
    };
    final SSLSocketFactory socketFactory = new SSLv3SocketFactory(sslCtx, verifier);
    final SchemeRegistry registry = new SchemeRegistry();
    registry.register(new Scheme("https", 443, socketFactory));

    final PoolingClientConnectionManager cm = new PoolingClientConnectionManager(registry);
    cm.setMaxTotal(100);
    cm.setDefaultMaxPerRoute(50);
    final HttpParams httpParams = new BasicHttpParams();
    HttpConnectionParams.setSoTimeout(httpParams, timeout);

    httpClient = new DefaultHttpClient(cm, httpParams);

    ((DefaultHttpClient) httpClient).setKeepAliveStrategy(new ConnectionKeepAliveStrategy() {
        @Override
        public long getKeepAliveDuration(HttpResponse hr, HttpContext hc) {
            return 0;
        }
    });
    httpClient.getParams().setParameter("http.socket.timeout", 900000);

UPD2：修改 SSLSocketFactory（“收到致命警报：bad_record_mac”问题）

  public class SSLv3SocketFactory extends SSLSocketFactory {

    private final javax.net.ssl.SSLSocketFactory socketfactory;

    public SSLv3SocketFactory(SSLContext sslContext, X509HostnameVerifier hostnameVerifier) {
        super(sslContext, hostnameVerifier);
        this.socketfactory = sslContext.getSocketFactory();
    }

    @Override
    public Socket createLayeredSocket(
            final Socket socket,
            final String host,
            final int port,
            final boolean autoClose) throws IOException, UnknownHostException {
        SSLSocket sslSocket = (SSLSocket) this.socketfactory.createSocket(
                socket,
                host,
                port,
                autoClose);
        sslSocket.setEnabledProtocols(new String[]{"SSLv3"});


        return sslSocket;
    }

    @Override
    public Socket connectSocket(
            final Socket socket,
            final InetSocketAddress remoteAddress,
            final InetSocketAddress localAddress,
            final HttpParams params) throws IOException, UnknownHostException, ConnectTimeoutException {

        if (socket instanceof SSLSocket) {
            ((SSLSocket) socket).setEnabledProtocols(new String[]{"SSLv3"});;
        }
        return super.connectSocket(socket, remoteAddress, localAddress, params);
    }
}

UPD3：问题仅存在于 SSLv3，TLSv1 工作正常

Answer 1

仅当 HttpClient 可以确保它们属于同一用户/安全上下文时（出于明显的原因），HttpClient 才会重新使用具有客户端身份验证的持久 SSL 连接。

确保对所有逻辑相关的请求使用相同的方法HttpContext。这将确保安全主体（客户端证书的 DN）在各个 HTTP 请求之间传播。

跟进

它发现服务器根本不希望连接被重新使用。每个响应都包含'Connection: close'提示客户端在收到响应后关闭连接的指令。但是，服务器可能会根据请求消息的组成对不同的客户端进行不同的处理。尝试使用不同的User-Agent标头值来伪装 HttpClient，看看是否有任何区别。