From 41606094d4330d2e79177b3a09dacb5390421eac Mon Sep 17 00:00:00 2001
From: Bryan Ferris <bferris@google.com>
Date: Fri, 6 Sep 2019 11:17:05 -0700
Subject: Require unlock for custom SMS dialog

Currently when a call is recieved there is an option to write a custom
text message in response to the call. This could allow an attacker to
imporsonate the user. With this change devices that have a lock screen
set will require that the pattern/pin/password be entered before a
custom message can be written.

This is a cherry-pick from the Pixel dialer. The original commit can be
found at cl/257702865

Bug: b/137102479
Test: Call phone running the modified dialer and attempt to send a
custom message

Change-Id: Ib6822436bcebc799e7e920f1a5898d107dd619db
Merged-In: Ib6822436bcebc799e7e920f1a5898d107dd619db
---
 .../incallui/answer/impl/AnswerFragment.java       | 49 ++++++++++++++++++++--
 1 file changed, 46 insertions(+), 3 deletions(-)

diff --git a/java/com/android/incallui/answer/impl/AnswerFragment.java b/java/com/android/incallui/answer/impl/AnswerFragment.java
index 8d8b08791..2405b8edd 100644
--- a/java/com/android/incallui/answer/impl/AnswerFragment.java
+++ b/java/com/android/incallui/answer/impl/AnswerFragment.java
@@ -22,10 +22,15 @@ import android.animation.AnimatorListenerAdapter;
 import android.animation.AnimatorSet;
 import android.animation.ObjectAnimator;
 import android.annotation.SuppressLint;
+import android.annotation.TargetApi;
+import android.app.KeyguardManager;
+import android.app.KeyguardManager.KeyguardDismissCallback;
 import android.content.Context;
 import android.content.pm.PackageManager;
 import android.location.Location;
 import android.net.Uri;
+import android.os.Build.VERSION;
+import android.os.Build.VERSION_CODES;
 import android.os.Bundle;
 import android.os.Handler;
 import android.os.Looper;
@@ -1052,14 +1057,47 @@ public class AnswerFragment extends Fragment
   }
 
   @Override
+  @TargetApi(VERSION_CODES.O)
   public void smsSelected(@Nullable CharSequence text) {
     LogUtil.i("AnswerFragment.smsSelected", null);
     textResponsesFragment = null;
 
     if (text == null) {
-      createCustomSmsDialogFragment = CreateCustomSmsDialogFragment.newInstance();
-      createCustomSmsDialogFragment.show(getChildFragmentManager(), null);
-      return;
+      if (VERSION.SDK_INT < VERSION_CODES.O) {
+        LogUtil.i("AnswerFragment.smsSelected", "below O, showing dialog directly");
+        showCustomSmsDialog();
+        return;
+      }
+      if (!getContext().getSystemService(KeyguardManager.class).isKeyguardLocked()) {
+        LogUtil.i("AnswerFragment.smsSelected", "not locked, showing dialog directly");
+        showCustomSmsDialog();
+        return;
+      }
+
+      // Show the custom reply dialog only after device is unlocked, as it may cause impersonation
+      // see b/137134588
+      LogUtil.i("AnswerFragment.smsSelected", "dismissing keyguard");
+      getContext()
+          .getSystemService(KeyguardManager.class)
+          .requestDismissKeyguard(
+              getActivity(),
+              new KeyguardDismissCallback() {
+                @Override
+                public void onDismissCancelled() {
+                  LogUtil.i("AnswerFragment.smsSelected", "onDismissCancelled");
+                }
+
+                @Override
+                public void onDismissError() {
+                  LogUtil.i("AnswerFragment.smsSelected", "onDismissError");
+                }
+
+                @Override
+                public void onDismissSucceeded() {
+                  LogUtil.i("AnswerFragment.smsSelected", "onDismissSucceeded");
+                  showCustomSmsDialog();
+                }
+              });return;
     }
 
     if (primaryCallState != null && canRejectCallWithSms()) {
@@ -1068,6 +1106,11 @@ public class AnswerFragment extends Fragment
     }
   }
 
+  private void showCustomSmsDialog() {
+    createCustomSmsDialogFragment = CreateCustomSmsDialogFragment.newInstance();
+    createCustomSmsDialogFragment.showNow(getChildFragmentManager(), null);
+  }
+
   @Override
   public void smsDismissed() {
     LogUtil.i("AnswerFragment.smsDismissed", null);
-- 
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