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Fix the issue provider can be wrong when requesting slice permission

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SlicePermissionActivity reads provider_pkg from intent, which can be
modified at will. As a result user might see incorrect package name in
the dialog granting slice permission.

Bug: 159145361
Test: manual
Merged-In: I8b66c02786df4096dad74b7e76255d5ddd1d609d
Change-Id: I8b66c02786df4096dad74b7e76255d5ddd1d609d
(cherry picked from commit 0ad32a2d70)
This commit is contained in:
Pinyao Ting
2020-09-24 15:33:58 -07:00
parent d08edccaf0
commit 4cab9c3876
2 changed files with 30 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

5
core/java/android/app/slice/SliceProvider.java
View File

@@ -152,10 +152,6 @@ public abstract class SliceProvider extends ContentProvider {
* @hide
*/
public static final String EXTRA_PKG = "pkg";
/**
* @hide
*/
public static final String EXTRA_PROVIDER_PKG = "provider_pkg";
/**
* @hide
*/
@@ -519,7 +515,6 @@ public abstract class SliceProvider extends ContentProvider {
"com.android.systemui.SlicePermissionActivity"));
intent.putExtra(EXTRA_BIND_URI, sliceUri);
intent.putExtra(EXTRA_PKG, callingPackage);
intent.putExtra(EXTRA_PROVIDER_PKG, context.getPackageName());
// Unique pending intent.
intent.setData(sliceUri.buildUpon().appendQueryParameter("package", callingPackage)
.build());

31
packages/SystemUI/src/com/android/systemui/SlicePermissionActivity.java
View File

@@ -16,6 +16,7 @@ package com.android.systemui;
import static android.view.WindowManager.LayoutParams.PRIVATE_FLAG_HIDE_NON_SYSTEM_OVERLAY_WINDOWS;
import android.annotation.Nullable;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.slice.SliceManager;
@@ -28,6 +29,7 @@ import android.content.pm.PackageManager.NameNotFoundException;
import android.net.Uri;
import android.os.Bundle;
import android.text.BidiFormatter;
import android.util.EventLog;
import android.util.Log;
import android.widget.CheckBox;
import android.widget.TextView;
@@ -49,10 +51,12 @@ public class SlicePermissionActivity extends Activity implements OnClickListener
mUri = getIntent().getParcelableExtra(SliceProvider.EXTRA_BIND_URI);
mCallingPkg = getIntent().getStringExtra(SliceProvider.EXTRA_PKG);
mProviderPkg = getIntent().getStringExtra(SliceProvider.EXTRA_PROVIDER_PKG);
try {
PackageManager pm = getPackageManager();
mProviderPkg = pm.resolveContentProvider(mUri.getAuthority(),
PackageManager.GET_META_DATA).applicationInfo.packageName;
verifyCallingPkg();
CharSequence app1 = BidiFormatter.getInstance().unicodeWrap(
pm.getApplicationInfo(mCallingPkg, 0).loadSafeLabel(pm).toString());
CharSequence app2 = BidiFormatter.getInstance().unicodeWrap(
@@ -92,4 +96,29 @@ public class SlicePermissionActivity extends Activity implements OnClickListener
public void onDismiss(DialogInterface dialog) {
finish();
}
private void verifyCallingPkg() {
final String providerPkg = getIntent().getStringExtra("provider_pkg");
if (providerPkg == null || mProviderPkg.equals(providerPkg)) return;
final String callingPkg = getCallingPkg();
EventLog.writeEvent(0x534e4554, "159145361", getUid(callingPkg), String.format(
"pkg %s (disguised as %s) attempted to request permission to show %s slices in %s",
callingPkg, providerPkg, mProviderPkg, mCallingPkg));
}
@Nullable
private String getCallingPkg() {
final Uri referrer = getReferrer();
if (referrer == null) return null;
return referrer.getHost();
}
private int getUid(@Nullable final String pkg) {
if (pkg == null) return -1;
try {
return getPackageManager().getApplicationInfo(pkg, 0).uid;
} catch (NameNotFoundException e) {
}
return -1;
}
}