httpclient绕过证书验证进行HTTPS请求

2022-11-09 12:51:27

http请求是我们常用的一种web应用的应用层协议，但是由于它的不安全性，现在正在逐渐向https协议过渡。https协议是在http的基础上进行了隧道加密，加密方式有SSL和TLS两种。当server用https协议进行数据交换后，client请求server时会对server的证书进行校验，如果server端证书为四大证书机构颁发的证书或者其授权机构颁发的证书，则允许进一步请求，否则会警告证书不受信任。更多信息可参考https://www.cnblogs.com/handsomeBoys/p/6556336.html

当用httpclient进行请求https，会提示找不到有效的证书（unable to find valid certification path to requested target）

出现这种情况就是server端的证书不被信任，可以通过重写一个类继承DefaultHttpClient类,代码如下：

 import org.apache.http.conn.ClientConnectionManager;

 import org.apache.http.conn.scheme.Scheme;

 import org.apache.http.conn.scheme.SchemeRegistry;

 import org.apache.http.conn.ssl.SSLSocketFactory;

 import org.apache.http.impl.client.DefaultHttpClient;

 import javax.net.ssl.SSLContext;

 import javax.net.ssl.TrustManager;

 import javax.net.ssl.X509TrustManager;

 import java.security.cert.CertificateException;

 import java.security.cert.X509Certificate;

 public class SSLClient extends DefaultHttpClient {

     public SSLClient() throws Exception{

         super();

         SSLContext ctx = SSLContext.getInstance("TLS");

         X509TrustManager tm = new X509TrustManager() {

             @Override

             public void checkClientTrusted(X509Certificate[] chain,

                                            String authType) throws CertificateException {

             }

             @Override

             public void checkServerTrusted(X509Certificate[] chain,

                                            String authType) throws CertificateException {

             }

             @Override

             public X509Certificate[] getAcceptedIssuers() {

                 return null;

             }

         };

         ctx.init(null, new TrustManager[]{tm}, null);

         SSLSocketFactory ssf = new SSLSocketFactory(ctx,SSLSocketFactory.ALLOW_ALL_HOSTNAME_VERIFIER);

         ClientConnectionManager ccm = this.getConnectionManager();

         SchemeRegistry sr = ccm.getSchemeRegistry();

         sr.register(new Scheme("https", 443, ssf));

     }

 }

然后在进行https请求创建HttpClient对象时用这个类的构造器创建对象就可以实现https请求，例如：

 import org.apache.http.Header;

 import org.apache.http.HttpResponse;

 import org.apache.http.client.methods.HttpGet;

 import org.apache.http.impl.client.CloseableHttpClient;

 public class RestApi {

     public static String getCsrf(){

         String csrfToken = "";

         try {

             CloseableHttpClient client = new SSLClient();

             String url = "https://10.67.19.186";

             HttpGet get = new HttpGet(url);

             HttpResponse response = client.execute(get);

             Header setCookidHeader = response.getFirstHeader("Set-Cookie");

             csrfToken = setCookidHeader.getValue().split(";")[0].split("=")[1];

         } catch (Exception e) {

             e.printStackTrace();

         }

         return csrfToken;

     }

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