From 66026773bbf1d7631743a5b892a4f768c694f868 Mon Sep 17 00:00:00 2001
From: Amith Yamasani <yamasani@google.com>
Date: Wed, 25 Sep 2013 14:05:33 -0700
Subject: [PATCH] Make sure that external callers cannot pass in the confirm
 bypass extra

Security fix for vulnerability where an app could launch into the screen lock
change dialog without first confirming the existing password/pattern.

Also, make sure that the fragments are launched with the correct corresponding
activity.

Bug: 9858403
Change-Id: I0f2c00a44abeb624c6fba0497bf6036a6f1a4564
---
 AndroidManifest.xml                              |  6 +++++-
 src/com/android/settings/ChooseLockGeneric.java  | 10 ++++++++--
 src/com/android/settings/ChooseLockPassword.java |  3 +++
 src/com/android/settings/ChooseLockPattern.java  |  5 ++++-
 4 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index 6b03d511b08..a34479dd1a3 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -1035,7 +1035,6 @@
 
         <!-- Second and third-level settings -->
 
-
         <!-- Lock screen settings -->
         <activity android:name="ConfirmLockPattern"/>
 
@@ -1051,6 +1050,11 @@
             </intent-filter>
         </activity>
 
+        <activity android:name="ChooseLockGeneric$InternalActivity" android:exported="false"
+            android:label="@string/lockpassword_choose_lock_generic_header"
+            android:excludeFromRecents="true"
+        />
+
         <activity android:name="ChooseLockPattern" android:exported="false"/>
 
         <activity android:name="ChooseLockPassword" android:exported="false"
diff --git a/src/com/android/settings/ChooseLockGeneric.java b/src/com/android/settings/ChooseLockGeneric.java
index 017adfac214..49de3668685 100644
--- a/src/com/android/settings/ChooseLockGeneric.java
+++ b/src/com/android/settings/ChooseLockGeneric.java
@@ -60,6 +60,9 @@ public class ChooseLockGeneric extends PreferenceActivity {
         return false;
     }
 
+    public static class InternalActivity extends ChooseLockGeneric {
+    }
+
     public static class ChooseLockGenericFragment extends SettingsPreferenceFragment {
         private static final int MIN_PASSWORD_LENGTH = 4;
         private static final String KEY_UNLOCK_BACKUP_INFO = "unlock_backup_info";
@@ -97,7 +100,9 @@ public class ChooseLockGeneric extends PreferenceActivity {
             // Defaults to needing to confirm credentials
             final boolean confirmCredentials = getActivity().getIntent()
                 .getBooleanExtra(CONFIRM_CREDENTIALS, true);
-            mPasswordConfirmed = !confirmCredentials;
+            if (getActivity() instanceof ChooseLockGeneric.InternalActivity) {
+                mPasswordConfirmed = !confirmCredentials;
+            }
 
             if (savedInstanceState != null) {
                 mPasswordConfirmed = savedInstanceState.getBoolean(PASSWORD_CONFIRMED);
@@ -341,7 +346,8 @@ public class ChooseLockGeneric extends PreferenceActivity {
         }
 
         private Intent getBiometricSensorIntent() {
-            Intent fallBackIntent = new Intent().setClass(getActivity(), ChooseLockGeneric.class);
+            Intent fallBackIntent = new Intent().setClass(getActivity(),
+                    ChooseLockGeneric.InternalActivity.class);
             fallBackIntent.putExtra(LockPatternUtils.LOCKSCREEN_BIOMETRIC_WEAK_FALLBACK, true);
             fallBackIntent.putExtra(CONFIRM_CREDENTIALS, false);
             fallBackIntent.putExtra(EXTRA_SHOW_FRAGMENT_TITLE,
diff --git a/src/com/android/settings/ChooseLockPassword.java b/src/com/android/settings/ChooseLockPassword.java
index c6f5212c334..f43738f0414 100644
--- a/src/com/android/settings/ChooseLockPassword.java
+++ b/src/com/android/settings/ChooseLockPassword.java
@@ -161,6 +161,9 @@ public class ChooseLockPassword extends PreferenceActivity {
             super.onCreate(savedInstanceState);
             mLockPatternUtils = new LockPatternUtils(getActivity());
             Intent intent = getActivity().getIntent();
+            if (!(getActivity() instanceof ChooseLockPassword)) {
+                throw new SecurityException("Fragment contained in wrong activity");
+            }
             mRequestedQuality = Math.max(intent.getIntExtra(LockPatternUtils.PASSWORD_TYPE_KEY,
                     mRequestedQuality), mLockPatternUtils.getRequestedPasswordQuality());
             mPasswordMinLength = Math.max(
diff --git a/src/com/android/settings/ChooseLockPattern.java b/src/com/android/settings/ChooseLockPattern.java
index c3045e26efd..328312c2f73 100644
--- a/src/com/android/settings/ChooseLockPattern.java
+++ b/src/com/android/settings/ChooseLockPattern.java
@@ -308,6 +308,9 @@ public class ChooseLockPattern extends PreferenceActivity {
         public void onCreate(Bundle savedInstanceState) {
             super.onCreate(savedInstanceState);
             mChooseLockSettingsHelper = new ChooseLockSettingsHelper(getActivity());
+            if (!(getActivity() instanceof ChooseLockPattern)) {
+                throw new SecurityException("Fragment contained in wrong activity");
+            }
         }
 
         @Override
@@ -338,7 +341,7 @@ public class ChooseLockPattern extends PreferenceActivity {
             topLayout.setDefaultTouchRecepient(mLockPatternView);
 
             final boolean confirmCredentials = getActivity().getIntent()
-                    .getBooleanExtra("confirm_credentials", false);
+                    .getBooleanExtra("confirm_credentials", true);
 
             if (savedInstanceState == null) {
                 if (confirmCredentials) {