Revoke 'always allow' adb grants after period of inactivity

Bug: 111656592
Change-Id: I679078dc3e8f61f33ca0922a47777eedb6a933de
Fixes: 116512306
Test: atest AdbDebuggingManagerTest
diff --git a/core/java/android/provider/Settings.java b/core/java/android/provider/Settings.java
index 707778f..e54c2bf 100644
--- a/core/java/android/provider/Settings.java
+++ b/core/java/android/provider/Settings.java
@@ -11869,6 +11869,28 @@
         public static final String KEEP_PROFILE_IN_BACKGROUND = "keep_profile_in_background";
 
         /**
+         * The default time in ms within which a subsequent connection from an always allowed system
+         * is allowed to reconnect without user interaction.
+         *
+         * @hide
+         */
+        public static final long DEFAULT_ADB_ALLOWED_CONNECTION_TIME = 604800000;
+
+        /**
+         * When the user first connects their device to a system a prompt is displayed to allow
+         * the adb connection with an option to 'Always allow' connections from this system. If the
+         * user selects this always allow option then the connection time is stored for the system.
+         * This setting is the time in ms within which a subsequent connection from an always
+         * allowed system is allowed to reconnect without user interaction.
+         *
+         * Type: long
+         *
+         * @hide
+         */
+        public static final String ADB_ALLOWED_CONNECTION_TIME =
+                "adb_allowed_connection_time";
+
+        /**
          * Get the key that retrieves a bluetooth headset's priority.
          * @hide
          */
diff --git a/core/proto/android/debug/enums.proto b/core/proto/android/debug/enums.proto
new file mode 100644
index 0000000..6747bb7
--- /dev/null
+++ b/core/proto/android/debug/enums.proto
@@ -0,0 +1,67 @@
+/*
+ * Copyright (C) 2019 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+syntax = "proto2";
+package android.debug;
+
+option java_outer_classname = "AdbProtoEnums";
+option java_multiple_files = true;
+
+/**
+ * adb connection state used to track adb connection changes in AdbDebuggingManager.java.
+ */
+enum AdbConnectionStateEnum {
+    UNKNOWN = 0;
+
+    /**
+     * The adb connection is waiting for approval from the user.
+     */
+    AWAITING_USER_APPROVAL = 1;
+
+    /**
+     * The user allowed the adb connection from the system.
+     */
+    USER_ALLOWED = 2;
+
+    /**
+     * The user denied the adb connection from the system.
+     */
+    USER_DENIED = 3;
+
+    /**
+     * The adb connection was automatically allowed without user interaction due to the system
+     * being previously allowed by the user with the 'always allow' option selected, and the adb
+     * grant has not yet expired.
+     */
+    AUTOMATICALLY_ALLOWED = 4;
+
+    /**
+     * An empty or invalid base64 encoded key was provided to the framework; the connection was
+     * automatically denied.
+     */
+    DENIED_INVALID_KEY = 5;
+
+    /**
+     * vold decrypt has not yet occurred; the connection was automatically denied.
+     */
+    DENIED_VOLD_DECRYPT = 6;
+
+    /**
+     * The adb session has been disconnected.
+     */
+    DISCONNECTED = 7;
+}
+
diff --git a/core/tests/coretests/src/android/provider/SettingsBackupTest.java b/core/tests/coretests/src/android/provider/SettingsBackupTest.java
index 87ad3d1..9a1c556 100644
--- a/core/tests/coretests/src/android/provider/SettingsBackupTest.java
+++ b/core/tests/coretests/src/android/provider/SettingsBackupTest.java
@@ -100,6 +100,7 @@
                     Settings.Global.ACTIVITY_MANAGER_CONSTANTS,
                     Settings.Global.ACTIVITY_STARTS_LOGGING_ENABLED,
                     Settings.Global.ADAPTIVE_BATTERY_MANAGEMENT_ENABLED,
+                    Settings.Global.ADB_ALLOWED_CONNECTION_TIME,
                     Settings.Global.ADB_ENABLED,
                     Settings.Global.ADD_USERS_WHEN_LOCKED,
                     Settings.Global.AIRPLANE_MODE_ON,