Make sure that external callers cannot pass in the confirm bypass extraHEADmaster

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

Conflicts:
	AndroidManifest.xml
	src/com/android/settings/ChooseLockGeneric.java

changes by Wolfgang Wiedmeyer <wolfgit@wiedmeyer.de> for replicant backport:
removed @Override for isValidFragment as android.app.Fragment is not imported
resolved merge conflict

4 files changed, 24 insertions, 5 deletions

diff --git a/AndroidManifest.xml b/AndroidManifest.xml
index c76adc8..fe30f83 100644
--- a/AndroidManifest.xml
+++ b/AndroidManifest.xml
@@ -1030,7 +1030,6 @@
 
         <!-- Second and third-level settings -->
 
-
         <!-- Lock screen settings -->
         <activity android:name="ConfirmLockPattern"/>
 
@@ -1046,7 +1045,10 @@
             </intent-filter>
         </activity>
 
-        <activity android:name="ChooseLockPatternSize" android:exported="false"/>
+        <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"/>
 
diff --git a/src/com/android/settings/ChooseLockGeneric.java b/src/com/android/settings/ChooseLockGeneric.java
index f67213c..28b8da9 100644
--- a/src/com/android/settings/ChooseLockGeneric.java
+++ b/src/com/android/settings/ChooseLockGeneric.java
@@ -49,6 +49,14 @@ public class ChooseLockGeneric extends PreferenceActivity {
         return modIntent;
     }
 
+    protected boolean isValidFragment(String fragmentName) {
+        if (ChooseLockGenericFragment.class.getName().equals(fragmentName)) return true;
+        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";
@@ -86,7 +94,9 @@ 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);
@@ -325,7 +335,8 @@ 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 aab4ba6..70ff443 100644
--- a/src/com/android/settings/ChooseLockPassword.java
+++ b/src/com/android/settings/ChooseLockPassword.java
@@ -154,6 +154,9 @@ 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 f92dca4..563b841 100644
--- a/src/com/android/settings/ChooseLockPattern.java
+++ b/src/com/android/settings/ChooseLockPattern.java
@@ -297,6 +297,9 @@ 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) {