how to Authenticate using HttpURLconnection

Question

i'm trying to read a website as html using the following code(i.e < html >< body >.....< /body >< /html >, but i need to provide authentication credentials, i have tried providing using java.net.Authenticator but it still dosen't seem to work, (if i enter www.google.com it works since no authentication is required)(I wish to implement this code in my android application)

package com.test.connection;

import java.io.BufferedInputStream;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.net.Authenticator;
import java.net.MalformedURLException;
import java.net.PasswordAuthentication;
import java.net.URL;
import java.net.HttpURLConnection;

public class Authenticate {

String username="myuser";
String password="mypass";
URL url=null;
String webHtmlData=null;

public static void main(String[] args) {
    Authenticate au=new Authenticate();
    au.setConnectionToWS("https://mysite/New/");      //if i enter www.google.com it works

}

public void setConnectionToWS(String inpUrl){

    Authenticator myAuth = new Authenticator() 
    {
        @Override
        protected PasswordAuthentication getPasswordAuthentication()
        {
            return new PasswordAuthentication(username, password.toCharArray());
        }
    };

    Authenticator.setDefault(myAuth);

    try {
        url = new URL(inpUrl);
    } catch (MalformedURLException e) {
        e.printStackTrace();
    }
    HttpURLConnection urlConnection = null;
    try {
        urlConnection = (HttpURLConnection) url.openConnection();
        urlConnection.connect();//on debugging the code fails on this line.
    } catch (IOException e) {
        e.printStackTrace();
    }
    try {
        InputStream in = null;
        try {
            in = new BufferedInputStream(urlConnection.getInputStream());

        } catch (IOException e) {
            e.printStackTrace();
        }
    }
    finally { 
        webHtmlData=readStream(urlConnection);
        System.out.println(webHtmlData);
        System.out.println("Done!!!");

    }
}

//read data as a browser
private String readStream(HttpURLConnection urlConnection) {

    StringBuffer response = null;

    try {
        BufferedReader is = 
                new BufferedReader(new InputStreamReader(urlConnection.getInputStream()));
        String inputLine;
        response = new StringBuffer();
        while ((inputLine = is.readLine()) != null) {
            response.append(inputLine);
        }
        is.close();
    }
    catch (Exception e) {
        e.printStackTrace();
    }
    return response.toString();
}

}

i tried debugging and the code shows the following error at line urlConnection.connect()

javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at com.sun.net.ssl.internal.ssl.Alerts.getSSLException(Unknown Source)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.fatal(Unknown Source)
at com.sun.net.ssl.internal.ssl.Handshaker.fatalSE(Unknown Source)
at com.sun.net.ssl.internal.ssl.Handshaker.fatalSE(Unknown Source)
at com.sun.net.ssl.internal.ssl.ClientHandshaker.serverCertificate(Unknown Source)
at com.sun.net.ssl.internal.ssl.ClientHandshaker.processMessage(Unknown Source)
at com.sun.net.ssl.internal.ssl.Handshaker.processLoop(Unknown Source)
at com.sun.net.ssl.internal.ssl.Handshaker.process_record(Unknown Source)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRecord(Unknown Source)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.performInitialHandshake(Unknown Source)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.startHandshake(Unknown Source)
at com.sun.net.ssl.internal.ssl.SSLSocketImpl.startHandshake(Unknown Source)
at sun.net.www.protocol.https.HttpsClient.afterConnect(Unknown Source)
at sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(Unknown Source)
at sun.net.www.protocol.https.HttpsURLConnectionImpl.connect(Unknown Source)
at com.test.connection.Authenticate.setConnectionToWS(Authenticate.java:48)
at com.test.connection.Authenticate.main(Authenticate.java:23)
Caused by: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at sun.security.validator.PKIXValidator.doBuild(Unknown Source)
at sun.security.validator.PKIXValidator.engineValidate(Unknown Source)
at sun.security.validator.Validator.validate(Unknown Source)
at com.sun.net.ssl.internal.ssl.X509TrustManagerImpl.validate(Unknown Source)
at com.sun.net.ssl.internal.ssl.X509TrustManagerImpl.checkServerTrusted(Unknown Source)
at com.sun.net.ssl.internal.ssl.X509TrustManagerImpl.checkServerTrusted(Unknown Source)
... 13 more
Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(Unknown Source)
at java.security.cert.CertPathBuilder.build(Unknown Source)
... 19 more

Am i not providing the credentials properly???

on passing the url as www.google.com i get the output as

<!doctype html><html itemscope="" itemtype="http://schema.org/WebPage" lang="en-IN"><head><meta content="/images/google_favicon_128.png" itemprop="image"><title>Google</title><script>(function(){window.google={kEI:"0i1WU93UJMaxrgfQjIDYCw",getEI:function(a){for(var b;a&&(!a.getAttribute||!(b=a.getAttribute("eid")));)a=a.parentNode;return b||google.kEI},https:function(){return"https:"==window.location.protocol},kEXPI:"17259,4000116,4007661,4007830,4008067,4008133,4008142,4009033,4009352,4009565,4009641,4010806,4010858,4010899,4011228,4011258,4011679,4011959,4012373,4012504,4013374,4013414,4013591,4013723,4013787,4013941,4013967,4013979,4014016,4014431,4014515,4014544,4014636,4014671,4014813,4014991,4015119,4015155,4015197,4015234,4015260,4015342,4015444,4015519,4015550,4015635,4015638,4015639,4015772,4015899,4016004,4016007,4016127,4016293,4016309,4016323,4016361,4016367,4016373,4016425,4016452,4016466,4016479,4016487,4016623,4016639,4016703,4016730,4016767,4016824,4016851,4016855,4016902,4016933,4016952,4016969,4016978,4017041,4017177,4017201,8300015,8300017,8500165,8500223,8500240,8500252,8500283,8500306,8500314,8500332,10200002,10200012,10200029,10200038,10200040,10200044,10200048,10200053,10200055,10200066,10200083,10200120,10200134,10200136,10200155,10200157,10200159,10200163,10200178,10200211,10200221,10200224,10200225,10200236",kCSI:{e:"17259,4000116,4007661,4007830,4008067,4008133,4008142,4009033,4009352,4009565,4009641,4010806,4010858,4010899,4011228,4011258,4011679,4011959,4012373,4012504,4013374,4013414,4013591,4013723,4013787,4013941,4013967,4013979,4014016,4014431,4014515,4014544,4014636,4014671,4014813,4014991,4015119,4015155,4015197,4015234,4015260,4015342,4015444,4015519,4015550,4015635,4015638,4015639,4015772,4015899,4016004,4016007,4016127,4016293,4016309,4016323,4016361,4016367,4016373,4016425,4016452,4016466,4016479,4016487,4016623,4016639,4016703,4016730,4016767,4016824,4016851,4016855,4016902,4016933,4016952,4016969,4016978,4017041,4017177,4017201,8300015,8300017,8500165,8500223,8500240,8500252,8500283,8500306,8500314,8500332,10200002,10200012,10200029,10200038,10200040,10200044,10200048,10200053,10200055,10200066,10200083,10200120,10200134,10200136,10200155,10200157,10200159,10200163,10200178,10200211,10200221,10200224,10200225,10200236",ei:"0i1WU93UJMaxrgfQjIDYCw"},authuser:0,ml:function(){},kHL:"en",time:function(){return(new Date).getTime()},log:function(a,b,c,h,k){var d=new Image,f=google.lc,e=google.li,g="";d.onerror=d.onload=d.onabort=function(){delete f[e]};f[e]=d;c||-1!=b.search("&ei=")||(g="&ei="+google.getEI(h));c=c||"/"+(k||"gen_204")+"?atyp=i&ct="+a+"&cad="+b+g+"&zx="+google.time();a=/^http:/i;a.test(c)&&google.https()?(google.ml(Error("GLMM"),!1,{src:c}),delete f[e]):(d.src=c,google.li=e+1)},lc:[],li:0,y:{},x:function(a,b){google.y[a.id]=[a,b];return!1},load:function(a,b,c){google.x({id:a+l++},function(){google.load(a,b,c)})}};var l=0;})();(function(){google.sn="webhp";google.timers={};google.startTick=function(a,b){var f=google.time();google.timers[a]={t:{start:f},bfr:!!b};};google.tick=function(a,b,f){google.timers[a]||google.startTick(a);google.timers[a].t[b]=f||google.time()};google.startTick("load",!0);try{}catch(d){}})();var _gjwl=location;function _gjuc(){var 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Done!!!

i need to get the same on passing my url which requires authentication,(on entering my url on a browser a popup is shown to enter username and password which on submitting i am directed to the page)

Answer 1

If you have a self-signed certificate, either you should import your self-signed certificate into java truststore or easy way add below code to bypass certificate validation. In production it is better to use a trusted certificate.

Add following code after Authenticator.setDefault(myAuth); line.

// Create a trust manager that does not validate certificate chains
    TrustManager[] trustAllCerts = new TrustManager[]{new X509TrustManager() {
        @Override
        public java.security.cert.X509Certificate[] getAcceptedIssuers() {
            return null;
        }

        @Override
        public void checkClientTrusted(X509Certificate[] certs, String authType) {
        }

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

    // Create all-trusting host name verifier
    HostnameVerifier allHostsValid = new HostnameVerifier() {
        @Override
        public boolean verify(String hostname, SSLSession session) {
            return true;
        }
    };

    try {
        // Install the all-trusting trust manager
        SSLContext sc = SSLContext.getInstance("SSL");
        sc.init(null, trustAllCerts, new java.security.SecureRandom());
        HttpsURLConnection.setDefaultSSLSocketFactory(sc.getSocketFactory());
        // Install the all-trusting host verifier
        HttpsURLConnection.setDefaultHostnameVerifier(allHostsValid);
    } catch (Exception ex) {
        ex.printStackTrace();
    }

Finally change this line

urlConnection = (HttpURLConnection) url.openConnection();

to (use HttpsUrlConnection)

urlConnection = (HttpsURLConnection) url.openConnection();