Apache HTTP 客户端 loadTrustMaterial 不起作用答案

【问题标题】：Apache HTTP Client loadTrustMaterial not workingApache HTTP 客户端 loadTrustMaterial 不起作用
【发布时间】：2021-04-12 00:37:16
【问题描述】：

首先，源代码中没有注释。

org.apache.hc.core5.ssl.SSLContextBuilder#loadTrustMaterial(org.apache.hc.core5.ssl.TrustStrategy)

public SSLContextBuilder loadTrustMaterial(
        final TrustStrategy trustStrategy) throws NoSuchAlgorithmException, KeyStoreException {
    return loadTrustMaterial(null, trustStrategy);
}

这里是触发混淆行为的代码，和apache官方demoApache Demo一样

@Test
void customStrategy() throws KeyStoreException, NoSuchAlgorithmException, KeyManagementException, IOException, ParseException {

    SSLContextBuilder sslContextBuilder = SSLContexts.custom();
    sslContextBuilder.loadTrustMaterial((chain, authType) -> false);
    SSLContext sslcontext = sslContextBuilder.build();

    SSLConnectionSocketFactoryBuilder sslConnectionSocketFactoryBuilder = SSLConnectionSocketFactoryBuilder.create();
    sslConnectionSocketFactoryBuilder.setSslContext(sslcontext);
    sslConnectionSocketFactoryBuilder.setTlsVersions(TLS.V_1_2);
    SSLConnectionSocketFactory sslConnectionSocketFactory = sslConnectionSocketFactoryBuilder.build();

    PoolingHttpClientConnectionManagerBuilder poolingHttpClientConnectionManagerBuilder = PoolingHttpClientConnectionManagerBuilder.create();
    poolingHttpClientConnectionManagerBuilder.setSSLSocketFactory(sslConnectionSocketFactory);
    HttpClientConnectionManager httpClientConnectionManager = poolingHttpClientConnectionManagerBuilder.build();

    HttpClientBuilder httpClientBuilder = HttpClients.custom();
    httpClientBuilder.setConnectionManager(httpClientConnectionManager);
    CloseableHttpClient closeableHttpClient = httpClientBuilder.build();

    HttpClientContext clientContext = HttpClientContext.create();

    CloseableHttpResponse response = closeableHttpClient.execute(new HttpGet("https://www.baidu.com"), clientContext);

    System.out.println("BODY-Length " + EntityUtils.toString(response.getEntity()).length());

    SSLSession sslSession = clientContext.getSSLSession();

    System.out.println(sslSession.getPeerHost() + ":" + sslSession.getPeerPort());
}

输出是：

... ...
BODY-Length 2443
www.baidu.com:443

即使我在自定义 TrustStrategy 中直接返回 false。

sslContextBuilder.loadTrustMaterial((chain, authType) -> {
    throw new CertificateException();
});

那会中断连接，但是我不认为如果接口返回false，而是只有在异常正确使用时才中断。

问题：为什么 return false 不起作用？ Thorw execption 让我感觉不对劲，这是为了设计吗？

【问题讨论】：

标签： java apache-httpclient-5.x

【解决方案1】：

请参阅TrustStrategy#isTrusted 的 javadocs。如果 TrustStrategy 从 isTrusted 方法返回 false，则证书验证由 SSL 上下文中配置的信任管理器执行。

【讨论】：