mirror of
https://github.com/Divested-Mobile/DivestOS-Build.git
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513 lines
22 KiB
Diff
513 lines
22 KiB
Diff
![]() |
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Winson <chiuwinson@google.com>
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Date: Tue, 26 May 2020 10:52:23 -0700
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Subject: [PATCH] Add PackageInstaller SessionParams restrictions
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To mitigate a boot loop with reading a massive
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install_sessions.xml file, this restricts the amount of
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data that can be written by limiting the size of
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unbounded parameters like package name and app label.
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This introduces a lowered max session count. 50 for general
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applications without the INSTALL_PACKAGES permission, and
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the same 1024 for those with the permission.
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Also truncates labels read from PackageItemInfo to 1000
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characters, which is probably enough.
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These changes restrict a malicious third party app to ~0.15 MB
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written to disk, and a valid installer to ~3.6 MB, as opposed to
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the >1000 MB previously allowed.
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These numbers assume no install granted runtime permissions.
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Those were not restricted since there's no good way to do so,
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but it's assumed that any installer with that permission is
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highly privleged and doesn't need to be limited.
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Along the same lines, DataLoaderParams are also not restricted.
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This will have to be added if that API is ever made public.
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However, installer package was restricted, even though the API is
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hidden. It was an easy add and may have some effect since the value
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is derived from other data and passed through by other system
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components.
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It's still possible to inflate the file size if a lot of
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different apps attempt to install a large number of packages,
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but that would require thousands of malicious apps to be installed.
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Bug: 157224146
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Test: atest android.content.pm.PackageSessionTests
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Change-Id: Iec42bee08d19d4ac53b361a92be6bc1401d9efc8
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---
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.../android/content/pm/PackageInstaller.java | 12 +-
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.../android/content/pm/PackageItemInfo.java | 12 +-
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.../tests/PackageInstallerSessions/Android.bp | 42 ++++
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.../AndroidManifest.xml | 29 +++
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.../android/content/pm/PackageSessionTests.kt | 188 ++++++++++++++++++
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.../server/pm/PackageInstallerService.java | 34 +++-
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.../permission/PermissionManagerService.java | 14 ++
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.../PermissionManagerServiceInternal.java | 7 +
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8 files changed, 332 insertions(+), 6 deletions(-)
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create mode 100644 core/tests/PackageInstallerSessions/Android.bp
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create mode 100644 core/tests/PackageInstallerSessions/AndroidManifest.xml
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create mode 100644 core/tests/PackageInstallerSessions/src/android/content/pm/PackageSessionTests.kt
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diff --git a/core/java/android/content/pm/PackageInstaller.java b/core/java/android/content/pm/PackageInstaller.java
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index b44b6d90811e..fce60faf6170 100644
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--- a/core/java/android/content/pm/PackageInstaller.java
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+++ b/core/java/android/content/pm/PackageInstaller.java
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@@ -1277,6 +1277,13 @@ public class PackageInstaller {
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/** {@hide} */
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public static final int UID_UNKNOWN = -1;
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+ /**
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+ * This value is derived from the maximum file name length. No package above this limit
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+ * can ever be successfully installed on the device.
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+ * @hide
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+ */
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+ public static final int MAX_PACKAGE_NAME_LENGTH = 255;
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+
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/** {@hide} */
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@UnsupportedAppUsage(maxTargetSdk = Build.VERSION_CODES.P, trackingBug = 115609023)
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public int mode = MODE_INVALID;
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@@ -1450,6 +1457,8 @@ public class PackageInstaller {
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/**
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* Optionally set a label representing the app being installed.
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+ *
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+ * This value will be trimmed to the first 1000 characters.
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*/
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public void setAppLabel(@Nullable CharSequence appLabel) {
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this.appLabel = (appLabel != null) ? appLabel.toString() : null;
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@@ -1519,7 +1528,8 @@ public class PackageInstaller {
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*
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* <p>Initially, all restricted permissions are whitelisted but you can change
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* which ones are whitelisted by calling this method or the corresponding ones
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- * on the {@link PackageManager}.
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+ * on the {@link PackageManager}. Only soft or hard restricted permissions on the current
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+ * Android version are supported and any invalid entries will be removed.
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*
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* @see PackageManager#addWhitelistedRestrictedPermission(String, String, int)
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* @see PackageManager#removeWhitelistedRestrictedPermission(String, String, int)
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diff --git a/core/java/android/content/pm/PackageItemInfo.java b/core/java/android/content/pm/PackageItemInfo.java
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index aa8e84262049..7cef05ac8733 100644
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--- a/core/java/android/content/pm/PackageItemInfo.java
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+++ b/core/java/android/content/pm/PackageItemInfo.java
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@@ -48,8 +48,16 @@ import java.util.Comparator;
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* in the implementation of Parcelable in subclasses.
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*/
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public class PackageItemInfo {
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- /** The maximum length of a safe label, in characters */
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- private static final int MAX_SAFE_LABEL_LENGTH = 1000;
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+
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+ /**
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+ * The maximum length of a safe label, in characters
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+ *
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+ * TODO(b/157997155): It may make sense to expose this publicly so that apps can check for the
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+ * value and truncate the strings/use a different label, without having to hardcode and make
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+ * assumptions about the value.
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+ * @hide
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+ */
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+ public static final int MAX_SAFE_LABEL_LENGTH = 1000;
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/** @hide */
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public static final float DEFAULT_MAX_LABEL_SIZE_PX = 500f;
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diff --git a/core/tests/PackageInstallerSessions/Android.bp b/core/tests/PackageInstallerSessions/Android.bp
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new file mode 100644
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index 000000000000..a564d30f3008
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--- /dev/null
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+++ b/core/tests/PackageInstallerSessions/Android.bp
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@@ -0,0 +1,42 @@
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+//
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+// Copyright 2020 The Android Open Source Project
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+//
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+// Licensed under the Apache License, Version 2.0 (the "License");
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+// you may not use this file except in compliance with the License.
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+// You may obtain a copy of the License at
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+//
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+// http://www.apache.org/licenses/LICENSE-2.0
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+//
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+// Unless required by applicable law or agreed to in writing, software
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+// distributed under the License is distributed on an "AS IS" BASIS,
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+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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+// See the License for the specific language governing permissions and
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+// limitations under the License.
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+//
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+
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+android_test {
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+ name: "FrameworksCorePackageInstallerSessionsTests",
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+
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+ srcs: [
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+ "src/**/*.kt",
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+ ],
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+ static_libs: [
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+ "androidx.test.rules",
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+ "compatibility-device-util-axt",
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+ "frameworks-base-testutils",
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+ "platform-test-annotations",
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+ "testng",
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+ "truth-prebuilt",
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+ ],
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+
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+ libs: [
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+ "android.test.runner",
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+ "android.test.base",
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+ "framework",
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+ "framework-res",
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+ ],
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+
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+ platform_apis: true,
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+ sdk_version: "test_current",
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+ test_suites: ["device-tests"],
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+}
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diff --git a/core/tests/PackageInstallerSessions/AndroidManifest.xml b/core/tests/PackageInstallerSessions/AndroidManifest.xml
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new file mode 100644
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index 000000000000..5b22d2b4f3e3
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--- /dev/null
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+++ b/core/tests/PackageInstallerSessions/AndroidManifest.xml
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@@ -0,0 +1,29 @@
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+<?xml version="1.0" encoding="utf-8"?>
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+<!--
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+ * Copyright (C) 2020 The Android Open Source Project
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+ *
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+ * Licensed under the Apache License, Version 2.0 (the "License");
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+ * you may not use this file except in compliance with the License.
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+ * You may obtain a copy of the License at
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+ *
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+ * http://www.apache.org/licenses/LICENSE-2.0
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+ *
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+ * Unless required by applicable law or agreed to in writing, software
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+ * distributed under the License is distributed on an "AS IS" BASIS,
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+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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+ * See the License for the specific language governing permissions and
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+ * limitations under the License.
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+ -->
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+
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+<manifest
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+ xmlns:android="http://schemas.android.com/apk/res/android"
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+ package="com.android.frameworks.coretests.package_installer_sessions"
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+ >
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+
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+ <application>
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+ <uses-library android:name="android.test.runner" />
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+ </application>
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+
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+ <instrumentation android:name="androidx.test.runner.AndroidJUnitRunner"
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+ android:targetPackage="com.android.frameworks.coretests.package_installer_sessions"/>
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+</manifest>
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diff --git a/core/tests/PackageInstallerSessions/src/android/content/pm/PackageSessionTests.kt b/core/tests/PackageInstallerSessions/src/android/content/pm/PackageSessionTests.kt
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new file mode 100644
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index 000000000000..494c92a8aa3f
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--- /dev/null
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+++ b/core/tests/PackageInstallerSessions/src/android/content/pm/PackageSessionTests.kt
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@@ -0,0 +1,188 @@
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+/*
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+ * Copyright (C) 2020 The Android Open Source Project
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+ *
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+ * Licensed under the Apache License, Version 2.0 (the "License");
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+ * you may not use this file except in compliance with the License.
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+ * You may obtain a copy of the License at
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+ *
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+ * http://www.apache.org/licenses/LICENSE-2.0
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+ *
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+ * Unless required by applicable law or agreed to in writing, software
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+ * distributed under the License is distributed on an "AS IS" BASIS,
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+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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+ * See the License for the specific language governing permissions and
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+ * limitations under the License.
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+ */
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+
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+package android.content.pm
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+
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+import android.content.Context
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+import android.content.pm.PackageInstaller.SessionParams
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+import android.platform.test.annotations.Presubmit
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+import androidx.test.InstrumentationRegistry
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+import androidx.test.filters.LargeTest
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+import com.android.compatibility.common.util.ShellIdentityUtils
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+import com.google.common.truth.Truth.assertThat
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+import org.junit.After
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+import org.junit.Before
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+import org.junit.Test
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+import org.testng.Assert.assertThrows
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+import kotlin.random.Random
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+
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+/**
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+ * For verifying public [PackageInstaller] session APIs. This differs from
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+ * [com.android.server.pm.PackageInstallerSessionTest] in services because that mocks the session,
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+ * whereas this test uses the installer on device.
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+ */
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+@Presubmit
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+class PackageSessionTests {
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+
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+ companion object {
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+ /**
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+ * Permissions marked "hardRestricted" or "softRestricted" in core/res/AndroidManifest.xml.
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+ */
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+ private val RESTRICTED_PERMISSIONS = listOf(
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+ "android.permission.SEND_SMS",
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+ "android.permission.RECEIVE_SMS",
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+ "android.permission.READ_SMS",
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+ "android.permission.RECEIVE_WAP_PUSH",
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+ "android.permission.RECEIVE_MMS",
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+ "android.permission.READ_CELL_BROADCASTS",
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+ "android.permission.ACCESS_BACKGROUND_LOCATION",
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+ "android.permission.READ_CALL_LOG",
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+ "android.permission.WRITE_CALL_LOG",
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+ "android.permission.PROCESS_OUTGOING_CALLS"
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+ )
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+ }
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+
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+ private val context: Context = InstrumentationRegistry.getContext()
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+
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+ private val installer = context.packageManager.packageInstaller
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+
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+ @Before
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+ @After
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+ fun abandonAllSessions() {
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+ installer.mySessions.asSequence()
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+ .map { it.sessionId }
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+ .forEach {
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+ try {
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+ installer.abandonSession(it)
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+ } catch (ignored: Exception) {
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+ // Querying for sessions checks by calling package name, but abandoning
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+ // checks by UID, which won't match if this test failed to clean up
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+ // on a previous install + run + uninstall, so ignore these failures.
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+ }
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+ }
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+ }
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+
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+ @Test
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+ fun truncateAppLabel() {
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+ val longLabel = invalidAppLabel()
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+ val params = SessionParams(SessionParams.MODE_FULL_INSTALL).apply {
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+ setAppLabel(longLabel)
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+ }
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+
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+ createSession(params) {
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+ assertThat(installer.getSessionInfo(it)?.appLabel)
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+ .isEqualTo(longLabel.take(PackageItemInfo.MAX_SAFE_LABEL_LENGTH))
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+ }
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+ }
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+
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+ @Test
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+ fun removeInvalidAppPackageName() {
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+ val longName = invalidPackageName()
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+ val params = SessionParams(SessionParams.MODE_FULL_INSTALL).apply {
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+ setAppPackageName(longName)
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+ }
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+
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+ createSession(params) {
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+ assertThat(installer.getSessionInfo(it)?.appPackageName)
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+ .isEqualTo(null)
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+ }
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+ }
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+
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+ @Test
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+ fun removeInvalidInstallerPackageName() {
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+ val longName = invalidPackageName()
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+ val params = SessionParams(SessionParams.MODE_FULL_INSTALL).apply {
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+ setInstallerPackageName(longName)
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+ }
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+
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+ createSession(params) {
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+ // If a custom installer name is dropped, it defaults to the caller
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+ assertThat(installer.getSessionInfo(it)?.installerPackageName)
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+ .isEqualTo(context.packageName)
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+ }
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+ }
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+
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+ @Test
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+ fun truncateWhitelistPermissions() {
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+ val params = SessionParams(SessionParams.MODE_FULL_INSTALL).apply {
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+ setWhitelistedRestrictedPermissions(invalidPermissions())
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+ }
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+
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+ createSession(params) {
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+ assertThat(installer.getSessionInfo(it)?.whitelistedRestrictedPermissions!!)
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+ .containsExactlyElementsIn(RESTRICTED_PERMISSIONS)
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+ }
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+ }
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+
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+ @LargeTest
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+ @Test
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+ fun allocateMaxSessionsWithPermission() {
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+ ShellIdentityUtils.invokeWithShellPermissions {
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+ repeat(1024) { createDummySession() }
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+ assertThrows(IllegalStateException::class.java) { createDummySession() }
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+ }
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+ }
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+
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+ @LargeTest
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+ @Test
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+ fun allocateMaxSessionsNoPermission() {
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+ repeat(50) { createDummySession() }
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+ assertThrows(IllegalStateException::class.java) { createDummySession() }
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+ }
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+
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+ private fun createDummySession() {
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+ installer.createSession(SessionParams(SessionParams.MODE_FULL_INSTALL)
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+ .apply {
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+ setAppPackageName(invalidPackageName())
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+ setAppLabel(invalidAppLabel())
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+ setWhitelistedRestrictedPermissions(invalidPermissions())
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+ })
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+ }
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+
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+ private fun invalidPackageName(maxLength: Int = SessionParams.MAX_PACKAGE_NAME_LENGTH): String {
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+ return (0 until (maxLength + 10))
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+ .asSequence()
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+ .mapIndexed { index, _ ->
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+ // A package name needs at least one separator
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+ if (index == 2) {
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+ '.'
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+ } else {
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+ Random.nextInt('z' - 'a').toChar() + 'a'.toInt()
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+ }
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+ }
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+ .joinToString(separator = "")
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+ }
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+
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+ private fun invalidAppLabel() = (0 until PackageItemInfo.MAX_SAFE_LABEL_LENGTH + 10)
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+ .asSequence()
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+ .map { Random.nextInt(Char.MAX_VALUE.toInt()).toChar() }
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+ .joinToString(separator = "")
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+
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+ private fun invalidPermissions() = RESTRICTED_PERMISSIONS.toMutableSet()
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+ .apply {
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+ // Add some invalid permission names
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+ repeat(10) { add(invalidPackageName(300)) }
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+ }
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+
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+ private fun createSession(params: SessionParams, block: (Int) -> Unit = {}) {
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+ val sessionId = installer.createSession(params)
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+ try {
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+ block(sessionId)
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+ } finally {
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+ installer.abandonSession(sessionId)
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+ }
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+ }
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+}
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diff --git a/services/core/java/com/android/server/pm/PackageInstallerService.java b/services/core/java/com/android/server/pm/PackageInstallerService.java
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index ea144fd7c4d5..7ab0c243ac58 100644
|
||
|
--- a/services/core/java/com/android/server/pm/PackageInstallerService.java
|
||
|
+++ b/services/core/java/com/android/server/pm/PackageInstallerService.java
|
||
|
@@ -42,6 +42,7 @@ import android.content.pm.PackageInfo;
|
||
|
import android.content.pm.PackageInstaller;
|
||
|
import android.content.pm.PackageInstaller.SessionInfo;
|
||
|
import android.content.pm.PackageInstaller.SessionParams;
|
||
|
+import android.content.pm.PackageItemInfo;
|
||
|
import android.content.pm.PackageManager;
|
||
|
import android.content.pm.ParceledListSlice;
|
||
|
import android.content.pm.VersionedPackage;
|
||
|
@@ -126,8 +127,10 @@ public class PackageInstallerService extends IPackageInstaller.Stub implements
|
||
|
private static final long MAX_AGE_MILLIS = 3 * DateUtils.DAY_IN_MILLIS;
|
||
|
/** Automatically destroy staged sessions that have not changed state in this time */
|
||
|
private static final long MAX_TIME_SINCE_UPDATE_MILLIS = 7 * DateUtils.DAY_IN_MILLIS;
|
||
|
- /** Upper bound on number of active sessions for a UID */
|
||
|
- private static final long MAX_ACTIVE_SESSIONS = 1024;
|
||
|
+ /** Upper bound on number of active sessions for a UID that has INSTALL_PACKAGES */
|
||
|
+ private static final long MAX_ACTIVE_SESSIONS_WITH_PERMISSION = 1024;
|
||
|
+ /** Upper bound on number of active sessions for a UID without INSTALL_PACKAGES */
|
||
|
+ private static final long MAX_ACTIVE_SESSIONS_NO_PERMISSION = 50;
|
||
|
/** Upper bound on number of historical sessions for a UID */
|
||
|
private static final long MAX_HISTORICAL_SESSIONS = 1048576;
|
||
|
/** Destroy sessions older than this on storage free request */
|
||
|
@@ -535,6 +538,20 @@ public class PackageInstallerService extends IPackageInstaller.Stub implements
|
||
|
throw new SecurityException("User restriction prevents installing");
|
||
|
}
|
||
|
|
||
|
+ // App package name and label length is restricted so that really long strings aren't
|
||
|
+ // written to disk.
|
||
|
+ if (params.appPackageName != null
|
||
|
+ && params.appPackageName.length() > SessionParams.MAX_PACKAGE_NAME_LENGTH) {
|
||
|
+ params.appPackageName = null;
|
||
|
+ }
|
||
|
+
|
||
|
+ params.appLabel = TextUtils.trimToSize(params.appLabel,
|
||
|
+ PackageItemInfo.MAX_SAFE_LABEL_LENGTH);
|
||
|
+
|
||
|
+ String requestedInstallerPackageName = (params.installerPackageName != null
|
||
|
+ && params.installerPackageName.length() < SessionParams.MAX_PACKAGE_NAME_LENGTH)
|
||
|
+ ? params.installerPackageName : installerPackageName;
|
||
|
+
|
||
|
if ((callingUid == Process.SHELL_UID) || (callingUid == Process.ROOT_UID)) {
|
||
|
params.installFlags |= PackageManager.INSTALL_FROM_ADB;
|
||
|
|
||
|
@@ -638,12 +655,23 @@ public class PackageInstallerService extends IPackageInstaller.Stub implements
|
||
|
}
|
||
|
}
|
||
|
|
||
|
+ if (params.whitelistedRestrictedPermissions != null) {
|
||
|
+ mPermissionManager.retainHardAndSoftRestrictedPermissions(
|
||
|
+ params.whitelistedRestrictedPermissions);
|
||
|
+ }
|
||
|
+
|
||
|
final int sessionId;
|
||
|
final PackageInstallerSession session;
|
||
|
synchronized (mSessions) {
|
||
|
// Sanity check that installer isn't going crazy
|
||
|
final int activeCount = getSessionCount(mSessions, callingUid);
|
||
|
- if (activeCount >= MAX_ACTIVE_SESSIONS) {
|
||
|
+ if (mContext.checkCallingOrSelfPermission(Manifest.permission.INSTALL_PACKAGES)
|
||
|
+ == PackageManager.PERMISSION_GRANTED) {
|
||
|
+ if (activeCount >= MAX_ACTIVE_SESSIONS_WITH_PERMISSION) {
|
||
|
+ throw new IllegalStateException(
|
||
|
+ "Too many active sessions for UID " + callingUid);
|
||
|
+ }
|
||
|
+ } else if (activeCount >= MAX_ACTIVE_SESSIONS_NO_PERMISSION) {
|
||
|
throw new IllegalStateException(
|
||
|
"Too many active sessions for UID " + callingUid);
|
||
|
}
|
||
|
diff --git a/services/core/java/com/android/server/pm/permission/PermissionManagerService.java b/services/core/java/com/android/server/pm/permission/PermissionManagerService.java
|
||
|
index 9f8e6eae3ba8..2fcdec7c92d6 100644
|
||
|
--- a/services/core/java/com/android/server/pm/permission/PermissionManagerService.java
|
||
|
+++ b/services/core/java/com/android/server/pm/permission/PermissionManagerService.java
|
||
|
@@ -3468,5 +3468,19 @@ public class PermissionManagerService {
|
||
|
PermissionManagerService.this.removeOnRuntimePermissionStateChangedListener(
|
||
|
listener);
|
||
|
}
|
||
|
+
|
||
|
+ @Override
|
||
|
+ public void retainHardAndSoftRestrictedPermissions(@NonNull List<String> permissions) {
|
||
|
+ synchronized (mLock) {
|
||
|
+ Iterator<String> iterator = permissions.iterator();
|
||
|
+ while (iterator.hasNext()) {
|
||
|
+ String permission = iterator.next();
|
||
|
+ BasePermission basePermission = mSettings.mPermissions.get(permission);
|
||
|
+ if (basePermission == null || !basePermission.isHardOrSoftRestricted()) {
|
||
|
+ iterator.remove();
|
||
|
+ }
|
||
|
+ }
|
||
|
+ }
|
||
|
+ }
|
||
|
}
|
||
|
}
|
||
|
diff --git a/services/core/java/com/android/server/pm/permission/PermissionManagerServiceInternal.java b/services/core/java/com/android/server/pm/permission/PermissionManagerServiceInternal.java
|
||
|
index a2f64eafe151..39ae8f589db2 100644
|
||
|
--- a/services/core/java/com/android/server/pm/permission/PermissionManagerServiceInternal.java
|
||
|
+++ b/services/core/java/com/android/server/pm/permission/PermissionManagerServiceInternal.java
|
||
|
@@ -36,6 +36,7 @@ import java.util.List;
|
||
|
* TODO: Should be merged into PermissionManagerInternal, but currently uses internal classes.
|
||
|
*/
|
||
|
public abstract class PermissionManagerServiceInternal extends PermissionManagerInternal {
|
||
|
+
|
||
|
/**
|
||
|
* Callbacks invoked when interesting actions have been taken on a permission.
|
||
|
* <p>
|
||
|
@@ -212,4 +213,10 @@ public abstract class PermissionManagerServiceInternal extends PermissionManager
|
||
|
/** Get all permission that have a certain protection level */
|
||
|
public abstract @NonNull ArrayList<PermissionInfo> getAllPermissionWithProtectionLevel(
|
||
|
@PermissionInfo.Protection int protectionLevel);
|
||
|
+
|
||
|
+ /**
|
||
|
+ * Removes invalid permissions which are not {@link PermissionInfo#FLAG_HARD_RESTRICTED} or
|
||
|
+ * {@link PermissionInfo#FLAG_SOFT_RESTRICTED} from the input.
|
||
|
+ */
|
||
|
+ public abstract void retainHardAndSoftRestrictedPermissions(@NonNull List<String> permissions);
|
||
|
}
|