Maxelweb/unipd-mobiotsec
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Code Pull Requests Releases Activity

Ex2 done

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This commit is contained in:
Mariano Sciacco
2021-03-08 18:07:20 +01:00
parent 676b9b566f
commit b691bb1edd
4 changed files with 72 additions and 56 deletions
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3
mobiotsec2filehasher/app/src/main/AndroidManifest.xml
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@@ -1,7 +1,8 @@
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.maliciousapp">
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.READ_INTERNAL_STORAGE" />
<application
android:allowBackup="true"
android:icon="@mipmap/ic_launcher"

57
mobiotsec2filehasher/app/src/main/java/com/example/maliciousapp/HashfileActivity.java
View File

@@ -1,16 +1,24 @@
package com.example.maliciousapp;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import androidx.core.content.ContextCompat;
import android.Manifest;
import android.app.Activity;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Bundle;
import android.util.Log;
import org.apache.commons.codec.digest.DigestUtils;
import org.apache.commons.io.FileUtils;
import java.io.BufferedInputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
public class HashfileActivity extends AppCompatActivity {
@@ -20,10 +28,11 @@ public class HashfileActivity extends AppCompatActivity {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_hashfile);
Log.d("MOBIOTSEC", "Activity called oh yes");
Log.d("MOBIOTSEC", "Activity called..");
Intent intent = getIntent();
String filePath = intent.getData().getPath();
String filePath = intent.getData().getEncodedPath();
// calculate hash
String hash = calcHash(filePath);
@@ -34,19 +43,51 @@ public class HashfileActivity extends AppCompatActivity {
setResult(Activity.RESULT_OK, resultIntent);
finish();
Log.d("MOBIOTSEC", "Activity finished..");
}
static public String calcHash(String filePath) {
public String calcHash(String filePath) {
if (this.isStoragePermissionGranted()) {
File file = new File(filePath);
byte[] bytes = new byte[0];
Log.d("MOBIOTSEC", "HELLOOOOO");
int size = (int) file.length();
byte[] bytes = new byte[size];
try {
bytes = FileUtils.readFileToByteArray(file);
BufferedInputStream buf = new BufferedInputStream(new FileInputStream(file));
buf.read(bytes, 0, bytes.length);
buf.close();
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return DigestUtils.sha256Hex(bytes);
}
else
return "";
}
public boolean isStoragePermissionGranted() {
if (Build.VERSION.SDK_INT >= 23) {
if (checkSelfPermission(Manifest.permission.READ_EXTERNAL_STORAGE)
== PackageManager.PERMISSION_GRANTED) {
Log.d("MOBIOTSEC", "Permission is granted");
return true;
} else {
Log.d("MOBIOTSEC", "Permission is revoked");
ActivityCompat.requestPermissions(this, new String[]{Manifest.permission.READ_EXTERNAL_STORAGE}, 1);
return false;
}
} else { //permission is automatically granted on sdk<23 upon installation
Log.d("MOBIOTSEC", "Permission is granted");
return true;
}
}
}

35
mobiotsec2filehasher/app/src/main/java/com/example/maliciousapp/MainActivity.java
View File

@@ -1,9 +1,13 @@
package com.example.maliciousapp;
import androidx.appcompat.app.AppCompatActivity;
import androidx.core.app.ActivityCompat;
import android.Manifest;
import android.app.Activity;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.os.Build;
import android.os.Bundle;
import android.util.Log;
@@ -19,37 +23,6 @@ public class MainActivity extends AppCompatActivity {
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Intent intent = getIntent();
Log.d("MOBIOTSEC", intent.toString());
Log.d("MOBIOTSEC", "ACTION = " + intent.getAction());
if(intent.getAction() != null) {
String filePath = intent.getData().getPath();
// calculate hash
String hash = calcHash(filePath);
// return the hash in a "result" intent
Intent resultIntent = new Intent();
resultIntent.putExtra("hash", hash);
setResult(Activity.RESULT_OK, resultIntent);
finish();
}
Log.d("MOBIOTSEC", "123 END HELLOOOOO");
}
static public String calcHash(String filePath) {
File file = new File(filePath);
byte[] bytes = new byte[0];
Log.d("MOBIOTSEC", "HELLOOOOO");
try {
bytes = FileUtils.readFileToByteArray(file);
} catch (IOException e) {
e.printStackTrace();
}
return DigestUtils.sha256Hex(bytes);
}
}

9
mobiotsec2filehasher/filehasher/filehasher_logs.txt
View File

@@ -1,6 +1,7 @@
--------- beginning of main
--------- beginning of system
--------- beginning of kernel
03-08 16:23:39.191 8344 8344 I MOBIOTSEC: /storage/emulated/0/YM3oPnYG.dat
03-08 16:23:40.933 8372 8372 D MOBIOTSEC: Activity called oh yes
03-08 16:23:40.933 8372 8372 D MOBIOTSEC: HELLOOOOO
03-08 17:06:52.125 6728 6728 I MOBIOTSEC: /storage/emulated/0/YM3oPnYG.dat
03-08 17:06:53.912 6771 6771 D MOBIOTSEC: Activity called..
03-08 17:06:53.914 6771 6771 D MOBIOTSEC: Permission is granted
03-08 17:06:53.946 6771 6771 D MOBIOTSEC: Activity finished..
03-08 17:06:54.120 6728 6728 I MOBIOTSEC: Good job! The expected hash and the received hash match! The flag is FLAG{piger_ipse_sibi_obstat}