Apache HTTP 客户端 loadTrustMaterial 不起作用

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);
}

这里是会触发混淆行为的代码，同apache官方演示Apache Demo

@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());
}

输出为：

... ...
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，但我不认为如果接口返回false，但只有在异常正确使用时才中断。

问题： 为什么返回 false 不起作用？ Thorw execption 让我感觉不对，这是设计的吗？

解决方法

请参阅 TrustStrategy#isTrusted 的 javadoc。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。