改造 OkHttp SSLHandshakeException

Question

我在 Retrofit 中使用 OkHttp 作为客户端。我无法访问某个 https 网址。此服务器仅支持 TLS 1.0 和以下密码 TLS_RSA_WITH_RC4_128_SHA， TLS_RSA_WITH_RC4_128_MD5

这是我实例化 OkHttpClient 的方式：

    OkHttpClient client = new OkHttpClient();

    try {
        // Create a trust manager that does not validate certificate chains
        final TrustManager[] trustAllCerts = new TrustManager[]{new X509TrustManager() {
            @Override
            public void checkClientTrusted(
                    java.security.cert.X509Certificate[] chain,
                    String authType) throws CertificateException {
            }

            @Override
            public void checkServerTrusted(
                    java.security.cert.X509Certificate[] chain,
                    String authType) throws CertificateException {
            }

            @Override
            public java.security.cert.X509Certificate[] getAcceptedIssuers() {
                return null;
            }
        }};

        // Install the all-trusting trust manager
        final SSLContext sslContext = SSLContext.getInstance("TLSv1");
        sslContext.init(null, trustAllCerts, new java.security.SecureRandom());

        // Create an ssl socket factory with our all-trusting manager
        final SSLSocketFactory sslSocketFactory = sslContext.getSocketFactory();
        client.setSslSocketFactory(sslSocketFactory);

        client.setHostnameVerifier(new HostnameVerifier() {
            @Override
            public boolean verify(String hostname, SSLSession session) {
                return true;
            }
        });
    } catch (Exception e) {
        throw new RuntimeException(e);
    }


    return client;
}

我的应用不断抛出这个异常：

javax.net.ssl.SSLProtocolException：SSL 握手中止：ssl=0x9742f000：SSL 库失败，通常是协议错误 错误：14077410：SSL 例程：SSL23_GET_SERVER_HELLO:sslv3 警报握手失败（外部/openssl/ssl/s23_clnt.c:770 0xab9fcc4d:0x00000000）

Answer 1

自 OkHttp v2.3 (release notes) 以来，OkHttp 在其默认配置中不再支持 RC4。您可以使用ConnectionSpec (javadoc) 来启用它，ConnectionSpecTest.java (source code) 显示了一些示例。