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Code Issues Releases Wiki Activity

Use Reflection to call WebSettings.setBlockNetworkLoads() to prevent info leaks via external resource loading. 

Fixes issue 1183
This commit is contained in:
cketti 2010-02-08 03:23:41 +00:00
parent 58f3005a28
commit 3b6cccdf7a
2 changed files with 49 additions and 9 deletions
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56
src/com/fsck/k9/K9.java
View File

@ -9,6 +9,8 @@ import android.content.SharedPreferences;
import android.content.pm.PackageManager;
import android.net.Uri;
import android.util.Log;
import android.webkit.WebSettings;
import com.fsck.k9.activity.MessageCompose;
import com.fsck.k9.mail.Address;
import com.fsck.k9.mail.Message;
@ -18,7 +20,7 @@ import com.fsck.k9.service.BootReceiver;
import com.fsck.k9.service.MailService;
import java.io.File;
import java.util.UUID;
import java.lang.reflect.Method;
public class K9 extends Application
{
@ -70,6 +72,14 @@ public class K9 extends Application
private static boolean mMessageListCheckboxes = false;
private static boolean mMessageListTouchable = false;
/**
* We use WebSettings.getBlockNetworkLoads() to prevent the WebView that displays email
* bodies from loading external resources over the network. Unfortunately this method
* isn't exposed via the official Android API. That's why we use reflection to be able
* to call the method.
*/
private static final Method mGetBlockNetworkLoads = getMethod(WebSettings.class, "setBlockNetworkLoads");
/**
* The MIME type(s) of attachments we're willing to send. At the moment it is not possible
@ -476,12 +486,40 @@ public class K9 extends Application
{
mMessageListCheckboxes = checkboxes;
}
private static Method getMethod(Class classObject, String methodName)
{
try
{
Method method = classObject.getMethod(methodName, boolean.class);
return method;
}
catch (NoSuchMethodException e)
{
Log.i(K9.LOG_TAG, "Can't get method " +
classObject.toString() + "." + methodName);
}
catch (Exception e)
{
Log.e(K9.LOG_TAG, "Error while using reflection to get method " +
classObject.toString() + "." + methodName, e);
}
return null;
}
public static void setBlockNetworkLoads(WebSettings webSettings, boolean state)
{
if (mGetBlockNetworkLoads != null)
{
try
{
mGetBlockNetworkLoads.invoke(webSettings, state);
}
catch (Exception e)
{
Log.e(K9.LOG_TAG, "Error on invoking WebSettings.setBlockNetworkLoads()", e);
}
}
}
}

2
src/com/fsck/k9/activity/MessageView.java
View File

@ -623,6 +623,7 @@ public class MessageView extends K9Activity
{
mMessageUid = uid;
mMessageContentView.getSettings().setBlockNetworkImage(true);
K9.setBlockNetworkLoads(mMessageContentView.getSettings(), true);
mAttachments.removeAllViews();
findSurroundingMessagesUid();
@ -1028,6 +1029,7 @@ public class MessageView extends K9Activity
private void onShowPictures()
{
K9.setBlockNetworkLoads(mMessageContentView.getSettings(), false);
mMessageContentView.getSettings().setBlockNetworkImage(false);
mShowPicturesSection.setVisibility(View.GONE);
}