From 73a7c9dcfd0752557d08d0e5972aa1ec9cad766a Mon Sep 17 00:00:00 2001 From: LuK1337 Date: Mon, 19 Feb 2024 16:20:04 +0100 Subject: [PATCH 11/12] Allow signature spoofing for microG Companion/Services This patch enables signature spoofing when the following conditions are met: * Build is debuggable (userdebug/eng) * Package name is com.android.vending or com.google.android.gms * Package is signed with microG release keys * Fake signature is correct Additionally, we let these apps be forceQueryable if they so desire. Change-Id: I8fc82ed266a2cc59636b662c7ea7e29c94f509b5 --- .../com/android/server/pm/AppsFilterImpl.java | 2 + .../com/android/server/pm/ComputerEngine.java | 54 +++++++++++++++++++ services/core/jni/Android.bp | 7 +++ .../com_android_server_pm_ComputerEngine.cpp | 38 +++++++++++++ services/core/jni/onload.cpp | 2 + 5 files changed, 103 insertions(+) create mode 100644 services/core/jni/com_android_server_pm_ComputerEngine.cpp diff --git a/services/core/java/com/android/server/pm/AppsFilterImpl.java b/services/core/java/com/android/server/pm/AppsFilterImpl.java index cc4c2b5bf..57263da93 100644 --- a/services/core/java/com/android/server/pm/AppsFilterImpl.java +++ b/services/core/java/com/android/server/pm/AppsFilterImpl.java @@ -36,6 +36,7 @@ import static com.android.server.pm.AppsFilterUtils.canQueryAsUpdateOwner; import static com.android.server.pm.AppsFilterUtils.canQueryViaComponents; import static com.android.server.pm.AppsFilterUtils.canQueryViaPackage; import static com.android.server.pm.AppsFilterUtils.canQueryViaUsesLibrary; +import static com.android.server.pm.ComputerEngine.isMicrogSigned; import android.annotation.NonNull; import android.annotation.Nullable; @@ -599,6 +600,7 @@ public final class AppsFilterImpl extends AppsFilterLocked implements Watchable, newIsForceQueryable = mForceQueryable.contains(newPkgSetting.getAppId()) /* shared user that is already force queryable */ || newPkgSetting.isForceQueryableOverride() /* adb override */ + || (newPkg.isForceQueryable() && isMicrogSigned(newPkg)) || (newPkgSetting.isSystem() && (mSystemAppsQueryable || newPkg.isForceQueryable() || ArrayUtils.contains(mForceQueryableByDevicePackageNames, diff --git a/services/core/java/com/android/server/pm/ComputerEngine.java b/services/core/java/com/android/server/pm/ComputerEngine.java index 4665a72b0..2f73bb836 100644 --- a/services/core/java/com/android/server/pm/ComputerEngine.java +++ b/services/core/java/com/android/server/pm/ComputerEngine.java @@ -102,6 +102,7 @@ import android.content.pm.UserPackage; import android.content.pm.VersionedPackage; import android.os.Binder; import android.os.Build; +import android.os.Bundle; import android.os.IBinder; import android.os.ParcelableException; import android.os.PatternMatcher; @@ -174,6 +175,7 @@ import java.util.Collections; import java.util.Comparator; import java.util.List; import java.util.Objects; +import java.util.Optional; import java.util.Set; import java.util.UUID; @@ -422,6 +424,10 @@ public class ComputerEngine implements Computer { private final PackageManagerInternal.ExternalSourcesPolicy mExternalSourcesPolicy; private final CrossProfileIntentResolverEngine mCrossProfileIntentResolverEngine; + // Signatures used by microG + private static final Signature MICROG_FAKE_SIGNATURE = new Signature("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"); + private static final Signature MICROG_REAL_SIGNATURE = new Signature("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"); + // PackageManagerService attributes that are primitives are referenced through the // pms object directly. Primitives are the only attributes so referenced. protected final PackageManagerService mService; @@ -1481,6 +1487,49 @@ public class ComputerEngine implements Computer { return result; } + private static native boolean isDebuggable(); + + public static boolean isMicrogSigned(AndroidPackage p) { + if (!isDebuggable()) { + return false; + } + + // Allowlist the following apps: + // * com.android.vending - microG Companion + // * com.google.android.gms - microG Services + if (!p.getPackageName().equals("com.android.vending") && + !p.getPackageName().equals("com.google.android.gms")) { + return false; + } + + return Signature.areExactMatch( + p.getSigningDetails(), new Signature[]{MICROG_REAL_SIGNATURE}); + } + + private static Optional generateFakeSignature(AndroidPackage p) { + if (!isMicrogSigned(p)) { + return Optional.empty(); + } + + Bundle metadata = p.getMetaData(); + if (metadata == null) { + return Optional.empty(); + } + + String fakeSignatureStr = metadata.getString("fake-signature"); + if (TextUtils.isEmpty(fakeSignatureStr)) { + return Optional.empty(); + } + + // Only MICROG_FAKE_SIGNATURE can be faked + Signature fakeSignature = new Signature(fakeSignatureStr); + if (!fakeSignature.equals(MICROG_FAKE_SIGNATURE)) { + return Optional.empty(); + } + + return Optional.of(fakeSignature); + } + public final PackageInfo generatePackageInfo(PackageStateInternal ps, @PackageManager.PackageInfoFlagsBits long flags, int userId) { if (!mUserManager.exists(userId)) return null; @@ -1536,6 +1585,11 @@ public class ComputerEngine implements Computer { mApexManager.getActivePackageNameForApexModuleName(apexModuleName)); } } + + generateFakeSignature(p).ifPresent(fakeSignature -> { + packageInfo.signatures = new Signature[]{fakeSignature}; + }); + return packageInfo; } else if ((flags & (MATCH_UNINSTALLED_PACKAGES | MATCH_ARCHIVED_PACKAGES)) != 0 && PackageUserStateUtils.isAvailable(state, flags)) { diff --git a/services/core/jni/Android.bp b/services/core/jni/Android.bp index a5085fc31..9a1d2bc2b 100644 --- a/services/core/jni/Android.bp +++ b/services/core/jni/Android.bp @@ -74,6 +74,7 @@ cc_library_static { "com_android_server_vibrator_VibratorManagerService.cpp", "com_android_server_pdb_PersistentDataBlockService.cpp", "com_android_server_am_LowMemDetector.cpp", + "com_android_server_pm_ComputerEngine.cpp", "com_android_server_pm_PackageManagerShellCommandDataLoader.cpp", "com_android_server_sensor_SensorService.cpp", "com_android_server_wm_TaskFpsCallbackController.cpp", @@ -97,6 +98,12 @@ cc_library_static { header_libs: [ "bionic_libc_platform_headers", ], + + product_variables: { + debuggable: { + cflags: ["-DANDROID_DEBUGGABLE"], + } + }, } cc_defaults { diff --git a/services/core/jni/com_android_server_pm_ComputerEngine.cpp b/services/core/jni/com_android_server_pm_ComputerEngine.cpp new file mode 100644 index 000000000..bbe298097 --- /dev/null +++ b/services/core/jni/com_android_server_pm_ComputerEngine.cpp @@ -0,0 +1,38 @@ +/* + * Copyright (C) 2024 The LineageOS 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. + */ + +#include + +namespace android { + +static bool isDebuggable(JNIEnv* env) { +#ifdef ANDROID_DEBUGGABLE + return true; +#else + return false; +#endif +} + +static const JNINativeMethod method_table[] = { + {"isDebuggable", "()Z", (void*)isDebuggable}, +}; + +int register_android_server_com_android_server_pm_ComputerEngine(JNIEnv* env) { + return jniRegisterNativeMethods(env, "com/android/server/pm/ComputerEngine", + method_table, NELEM(method_table)); +} + +} // namespace android diff --git a/services/core/jni/onload.cpp b/services/core/jni/onload.cpp index 3c55d1824..5fac851d9 100644 --- a/services/core/jni/onload.cpp +++ b/services/core/jni/onload.cpp @@ -59,6 +59,7 @@ int register_android_server_am_LowMemDetector(JNIEnv* env); int register_android_server_utils_AnrTimer(JNIEnv *env); int register_com_android_server_soundtrigger_middleware_AudioSessionProviderImpl(JNIEnv* env); int register_com_android_server_soundtrigger_middleware_ExternalCaptureStateTracker(JNIEnv* env); +int register_android_server_com_android_server_pm_ComputerEngine(JNIEnv* env); int register_android_server_com_android_server_pm_PackageManagerShellCommandDataLoader(JNIEnv* env); int register_android_server_AdbDebuggingManager(JNIEnv* env); int register_android_server_FaceService(JNIEnv* env); @@ -124,6 +125,7 @@ extern "C" jint JNI_OnLoad(JavaVM* vm, void* /* reserved */) register_android_server_utils_AnrTimer(env); register_com_android_server_soundtrigger_middleware_AudioSessionProviderImpl(env); register_com_android_server_soundtrigger_middleware_ExternalCaptureStateTracker(env); + register_android_server_com_android_server_pm_ComputerEngine(env); register_android_server_com_android_server_pm_PackageManagerShellCommandDataLoader(env); register_android_server_AdbDebuggingManager(env); register_android_server_FaceService(env); -- 2.44.0