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Android Login app, using Self-Signed SSL Certificate. Later on, I'll create a project at GitHub, with the whole App (explanations and details).
<?xml version="1.0" encoding="utf-8"?>
<layout>
<data>
<variable
name="handler"
type="com.ivanlmj.myapp.LoginScreen" />
</data>
<LinearLayout
android:orientation="vertical"
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#1a75ff"
tools:context=".LoginScreen">
<LinearLayout
android:orientation="vertical"
android:layout_marginTop="25dp"
android:layout_width="match_parent"
android:layout_height="wrap_content">
<LinearLayout
android:orientation="horizontal"
android:layout_width="wrap_content"
android:layout_height="150dp"
android:layout_marginStart="0dp"
android:layout_marginLeft="0dp">
<ImageView
android:layout_width="110dp"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:layout_marginStart="30dp"
android:layout_marginLeft="0dp"
android:scaleX="0.8"
android:scaleY="0.8"
android:src="@drawable/an_image" <!-- must store an image inside ot the drawable directory -->
tools:ignore="ContentDescription" />
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_marginTop="60dp"
android:layout_marginStart="10dp"
android:layout_marginLeft="0dp"
android:text="MyApp"
android:textSize="34sp"
android:textColor="#ffffff"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#1a75ff">
<TextView
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_marginTop="20dp"
android:gravity="center"
android:text="WELCOME"
android:textColor="#ffffff"
android:textSize="25sp"/>
</LinearLayout>
</LinearLayout>
<LinearLayout
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<EditText
android:id="@+id/tjs_login_screen_usuario"
android:layout_marginTop="30dp"
android:layout_gravity="center"
android:layout_height="42dp"
android:layout_width="270dp"
android:ems="12"
android:hint="@string/login_text_user"
android:inputType="text"
android:textSize="15sp"
android:textColorHint="#ffffff"/>
<EditText
android:id="@+id/tjs_login_screen_contraseña"
android:layout_marginTop="10dp"
android:layout_gravity="center"
android:layout_height="42dp"
android:layout_width="270dp"
android:ems="12"
android:hint="@string/login_text_password"
android:inputType="textPassword"
android:textSize="15sp"
android:textColorHint="#ffffff"/>
<Button
android:id="@+id/tjs_login_screen_button"
android:layout_marginTop="20dp"
android:layout_marginStart="0dp"
android:layout_marginLeft="0dp"
android:layout_gravity="center"
android:layout_width="270dp"
android:layout_height="80dp"
android:textColor="#ffffff"
android:onClick="login"
android:text="@string/login_button_name"
android:textSize="16sp"/>
</LinearLayout>
</LinearLayout>
</layout>
package com.ivanlmj.myapp;
import android.content.Context;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.Toast;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.HurlStack;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import java.io.InputStream;
import java.security.KeyStore;
import java.security.cert.Certificate;
import java.security.cert.CertificateFactory;
import java.util.HashMap;
import java.util.Map;
import javax.net.ssl.SSLContext;
import javax.net.ssl.SSLSocketFactory;
import javax.net.ssl.TrustManagerFactory;
public class LoginScreenTest extends AppCompatActivity {
HurlStack hurlStack = null;
EditText username = null;
EditText password = null;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_1_login_screen);
username = (EditText) findViewById(R.id.tjs_login_screen_usuario);
password = (EditText) findViewById(R.id.tjs_login_screen_contraseña);
try {
/* To understand the concept about Self-Signed Certificates, Custom TrustManagers, etc.
CertificateFactory: https://docs.oracle.com/javase/7/docs/api/java/security/cert/CertificateFactory.html
Certificate: https://docs.oracle.com/javase/7/docs/api/java/security/cert/Certificate.html
KeyStore: https://docs.oracle.com/javase/7/docs/api/java/security/KeyStore.html
KeyManagerFactory: https://docs.oracle.com/javase/7/docs/api/javax/net/ssl/KeyManagerFactory.html
TrustManagerFactory: http://docs.oracle.com/javase/7/docs/api/javax/net/ssl/TrustManagerFactory.html
SSLContext: https://docs.oracle.com/javase/7/docs/api/javax/net/ssl/SSLContext.html
SSLSocketFactory: https://docs.oracle.com/javase/7/docs/api/javax/net/ssl/SSLSocketFactory.html
*/
Context myContext = getApplicationContext();
InputStream inStream = myContext.getResources().openRawResource(R.raw.tdmssl);
// Use the .crt file obtained via this script: https://gist.github.com/ivanlmj/a6a93dd142fb623d01262303d5bd8074
CertificateFactory cf = CertificateFactory.getInstance("X.509");
Certificate ca = cf.generateCertificate(inStream);
inStream.close();
String keyStoreType = KeyStore.getDefaultType();
KeyStore ks = KeyStore.getInstance(keyStoreType);
ks.load(null, null);
ks.setCertificateEntry("ca", ca);
TrustManagerFactory tmf = TrustManagerFactory.getInstance("X509");
tmf.init(ks);
SSLContext sslContext = SSLContext.getInstance("TLS");
sslContext.init(null, tmf.getTrustManagers(), null);
SSLSocketFactory sslSocketFactory = sslContext.getSocketFactory();
hurlStack = new HurlStack(null, sslSocketFactory);
} catch (Exception e){
Log.d("my_app","LoginScreen.java - SSL Exception: " + e.toString());
e.printStackTrace();
}
}
public void login(View view) {
setProgressBarIndeterminateVisibility(true);
RequestQueue queue = Volley.newRequestQueue(this, hurlStack);
// In this example, I'm uing Python FLASK with MySQL.
// Basically, FLASK performs a query, looking for user + pass in a database (table).
final String url = "https://127.0.0.1:5000/login";
StringRequest postRequest = new StringRequest(Request.Method.POST, url,
new Response.Listener<String>()
{
@Override
public void onResponse(String response) {
Log.d("my_app", "LoginScreen.java - Request status: SUCCESSFUL");
Log.d("my_app", "LoginScreen.java - Response content:" + response);
if (response.equals("ok")) {
Log.d("my_app", "LoginScreen.java - Login status: SUCCESSFUL");
Log.d("tjs_app", "LoginScreen.java - Authenticated User: " + username.getText().toString().trim());
Toast.makeText(getApplicationContext(), "Login OK!",Toast.LENGTH_SHORT).show();
} else {
Log.d("my_app", "LoginScreen.java - Login status: FAIL");
Log.d("my_app", "LoginScreen.java - Authentication attempt from: " + username.getText().toString().trim());
Toast.makeText(getApplicationContext(), "Check User or Password.",Toast.LENGTH_SHORT).show();
}
}
},
new Response.ErrorListener()
{
@Override
public void onErrorResponse(VolleyError error) {
Log.d("my_app", "LoginScreen.java - Request status: FAIL");
Log.d("my_app", "LoginScreen.java - Response content:" + error);
Toast.makeText(getApplicationContext(), "Check your internet connection.",Toast.LENGTH_SHORT).show();
}
}
) {
@Override
protected Map<String, String> getParams()
{
Map<String, String> params = new HashMap<String, String>();
params.put("username", username.getText().toString().trim());
params.put("password", password.getText().toString().trim());
return params;
}
};
queue.add(postRequest);
}
}
@cm0001

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commented May 26, 2017

"Later on, I'll create a project at GitHub, with the whole App (explanations and details)." <-- Looking forward to this! Thanks for sharing. -cm

@ivanlmj

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Owner Author

commented Jun 14, 2017

I'm working on with it, mood1. I'll let you know, soon enough :)! Bye bye

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