Unexport all PackageInstaller receivers

All of PackageInstaller's declared receivers receive system broadcasts,
so they do not need to be exported. Leaving them exported opens up
vulnerabilities for apps to launch them and execute functionality that
PackageInstaller includes.

Bug: 191283525

Test: manual, verify receivers still work
Test: atest com.android.packageinstaller.test.ExportedComponentTest

Merged-In: I782fc21c848831a2a4aeab736cd47ad45781b290
Change-Id: I782fc21c848831a2a4aeab736cd47ad45781b290
(cherry picked from commit 0806568d4133e1dc736ebcc45f62655165366a9e)
diff --git a/packages/PackageInstaller/AndroidManifest.xml b/packages/PackageInstaller/AndroidManifest.xml
index 48cdf16..197b7b2 100644
--- a/packages/PackageInstaller/AndroidManifest.xml
+++ b/packages/PackageInstaller/AndroidManifest.xml
@@ -31,7 +31,7 @@
             android:directBootAware="true">
 
         <receiver android:name=".TemporaryFileManager"
-            android:exported="true">
+            android:exported="false">
             <intent-filter>
                 <action android:name="android.intent.action.BOOT_COMPLETED" />
             </intent-filter>
@@ -76,7 +76,7 @@
 
         <receiver android:name=".InstallEventReceiver"
                 android:permission="android.permission.INSTALL_PACKAGES"
-                android:exported="true">
+                android:exported="false">
             <intent-filter android:priority="1">
                 <action android:name="com.android.packageinstaller.ACTION_INSTALL_COMMIT" />
             </intent-filter>
@@ -106,14 +106,14 @@
 
         <receiver android:name=".UninstallEventReceiver"
             android:permission="android.permission.INSTALL_PACKAGES"
-            android:exported="true">
+            android:exported="false">
             <intent-filter android:priority="1">
                 <action android:name="com.android.packageinstaller.ACTION_UNINSTALL_COMMIT" />
             </intent-filter>
         </receiver>
 
         <receiver android:name=".PackageInstalledReceiver"
-                android:exported="true">
+                android:exported="false">
             <intent-filter android:priority="1">
                 <action android:name="android.intent.action.PACKAGE_ADDED" />
                 <data android:scheme="package" />
diff --git a/packages/PackageInstaller/TEST_MAPPING b/packages/PackageInstaller/TEST_MAPPING
index 5d7b9bb..cef9014 100644
--- a/packages/PackageInstaller/TEST_MAPPING
+++ b/packages/PackageInstaller/TEST_MAPPING
@@ -19,6 +19,9 @@
     },
     {
       "name": "CtsPackageUninstallTestCases"
+    },
+    {
+      "name": "PackageInstallerTests"
     }
   ]
-}
\ No newline at end of file
+}
diff --git a/services/tests/PackageManager/packageinstaller/Android.bp b/services/tests/PackageManager/packageinstaller/Android.bp
new file mode 100644
index 0000000..35d754b
--- /dev/null
+++ b/services/tests/PackageManager/packageinstaller/Android.bp
@@ -0,0 +1,39 @@
+// Copyright (C) 2021 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.
+
+package {
+    // See: http://go/android-license-faq
+    // A large-scale-change added 'default_applicable_licenses' to import
+    // all of the 'license_kinds' from "frameworks_base_license"
+    // to get the below license kinds:
+    //   SPDX-license-identifier-Apache-2.0
+    default_applicable_licenses: ["frameworks_base_license"],
+}
+
+android_test {
+    name: "PackageInstallerTests",
+    srcs: [
+        "src/**/*.java",
+        "src/**/*.kt",
+    ],
+    static_libs: [
+        "androidx.test.rules",
+        "androidx.test.runner",
+        "junit",
+        "kotlin-test",
+        "truth-prebuilt",
+    ],
+    platform_apis: true,
+    test_suites: ["device-tests"],
+}
diff --git a/services/tests/PackageManager/packageinstaller/AndroidManifest.xml b/services/tests/PackageManager/packageinstaller/AndroidManifest.xml
new file mode 100644
index 0000000..d706258
--- /dev/null
+++ b/services/tests/PackageManager/packageinstaller/AndroidManifest.xml
@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (C) 2021 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.
+  -->
+
+<manifest xmlns:android="http://schemas.android.com/apk/res/android"
+    package="com.android.packageinstaller.test">
+
+    <uses-permission android:name="android.permission.QUERY_ALL_PACKAGES"/>
+
+    <instrumentation
+        android:name="androidx.test.runner.AndroidJUnitRunner"
+        android:targetPackage="com.android.packageinstaller.test"
+        />
+
+</manifest>
+
diff --git a/services/tests/PackageManager/packageinstaller/AndroidTest.xml b/services/tests/PackageManager/packageinstaller/AndroidTest.xml
new file mode 100644
index 0000000..c39285ff
--- /dev/null
+++ b/services/tests/PackageManager/packageinstaller/AndroidTest.xml
@@ -0,0 +1,29 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ Copyright (C) 2021 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.
+  -->
+
+<configuration description="Test module config for PackageInstallerTests">
+    <option name="test-tag" value="PackageInstallerTests" />
+
+    <target_preparer class="com.android.tradefed.targetprep.suite.SuiteApkInstaller">
+        <option name="cleanup-apks" value="true" />
+        <option name="test-file-name" value="PackageInstallerTests.apk" />
+    </target_preparer>
+
+    <test class="com.android.tradefed.testtype.AndroidJUnitTest">
+        <option name="package" value="com.android.packageinstaller.test" />
+    </test>
+</configuration>
diff --git a/services/tests/PackageManager/packageinstaller/src/com/android/packageinstaller/test/ExportedComponentTest.kt b/services/tests/PackageManager/packageinstaller/src/com/android/packageinstaller/test/ExportedComponentTest.kt
new file mode 100644
index 0000000..d7d2726
--- /dev/null
+++ b/services/tests/PackageManager/packageinstaller/src/com/android/packageinstaller/test/ExportedComponentTest.kt
@@ -0,0 +1,50 @@
+/*
+ * Copyright (C) 2021 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.
+ */
+
+package com.android.packageinstaller.test
+
+import android.content.Context
+import android.content.Intent
+import android.content.pm.PackageManager
+import android.net.Uri
+import androidx.test.InstrumentationRegistry
+import com.google.common.truth.Truth.assertThat
+import com.google.common.truth.Truth.assertWithMessage
+import org.junit.Test
+
+class ExportedComponentTest {
+
+    private val context: Context = InstrumentationRegistry.getContext()
+
+    @Test
+    fun verifyNoExportedReceivers() {
+        val intent = Intent(Intent.ACTION_INSTALL_PACKAGE).apply {
+            data = Uri.parse("content://mockForTest")
+        }
+        val packageInstallers = context.packageManager.queryIntentActivities(intent,
+            PackageManager.MATCH_DEFAULT_ONLY or PackageManager.MATCH_DISABLED_COMPONENTS)
+            .map { it.activityInfo.packageName }
+            .distinct()
+            .map { context.packageManager.getPackageInfo(it, PackageManager.GET_RECEIVERS) }
+
+        assertThat(packageInstallers).isNotEmpty()
+
+        packageInstallers.forEach {
+            val exported = it.receivers.filter { it.exported }
+            assertWithMessage("Receivers should not be exported").that(exported).isEmpty()
+        }
+    }
+}