Allow signature spoofing for microG Companion/Services (438d9fea) · Commits · e / os / android_frameworks_base

services/core/java/com/android/server/pm/AppsFilter.java

+2 −0

Original line number	Original line	Diff line number	Diff line
	@@ -20,6 +20,7 @@ import static android.os.Trace.TRACE_TAG_PACKAGE_MANAGER;
	import static android.provider.DeviceConfig.NAMESPACE_PACKAGE_MANAGER_SERVICE;		import static android.provider.DeviceConfig.NAMESPACE_PACKAGE_MANAGER_SERVICE;

	import static com.android.internal.annotations.VisibleForTesting.Visibility.PRIVATE;		import static com.android.internal.annotations.VisibleForTesting.Visibility.PRIVATE;
			import static com.android.server.pm.PackageManagerService.isMicrogSigned;

	import android.Manifest;		import android.Manifest;
	import android.annotation.NonNull;		import android.annotation.NonNull;
	@@ -568,6 +569,7 @@ public class AppsFilter {
	mForceQueryable.contains(newPkgSetting.appId)		mForceQueryable.contains(newPkgSetting.appId)
	/* shared user that is already force queryable */		/* shared user that is already force queryable */
	\|\| newPkgSetting.forceQueryableOverride /* adb override */		\|\| newPkgSetting.forceQueryableOverride /* adb override */
			\|\| (newPkg.isForceQueryable() && isMicrogSigned(newPkg))
	\|\| (newPkgSetting.isSystem() && (mSystemAppsQueryable		\|\| (newPkgSetting.isSystem() && (mSystemAppsQueryable
	\|\| newPkg.isForceQueryable()		\|\| newPkg.isForceQueryable()
	\|\| ArrayUtils.contains(mForceQueryableByDevicePackageNames,		\|\| ArrayUtils.contains(mForceQueryableByDevicePackageNames,

services/core/java/com/android/server/pm/PackageManagerService.java

+56 −0

Original line number	Original line	Diff line number	Diff line
	@@ -423,6 +423,7 @@ import java.util.LinkedHashSet;
	import java.util.List;		import java.util.List;
	import java.util.Map;		import java.util.Map;
	import java.util.Objects;		import java.util.Objects;
			import java.util.Optional;
	import java.util.Set;		import java.util.Set;
	import java.util.UUID;		import java.util.UUID;
	import java.util.concurrent.CountDownLatch;		import java.util.concurrent.CountDownLatch;
	@@ -709,6 +710,10 @@ public class PackageManagerService extends IPackageManager.Stub

	private static final String RANDOM_DIR_PREFIX = "~~";		private static final String RANDOM_DIR_PREFIX = "~~";

			// 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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");

	final ServiceThread mHandlerThread;		final ServiceThread mHandlerThread;

	final Handler mHandler;		final Handler mHandler;
	@@ -4416,6 +4421,53 @@ public class PackageManagerService extends IPackageManager.Stub
	return false;		return false;
	}		}

			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;
			}

			Signature[] signatures = p.getSigningDetails().signatures;
			if (signatures == null) {
			return false;
			}

			return Signature.areExactMatch(signatures, new Signature[]{MICROG_REAL_SIGNATURE});
			}

			private static Optional<Signature> 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);
			}

	private PackageInfo generatePackageInfo(PackageSetting ps, int flags, int userId) {		private PackageInfo generatePackageInfo(PackageSetting ps, int flags, int userId) {
	if (!mUserManager.exists(userId)) return null;		if (!mUserManager.exists(userId)) return null;
	if (ps == null) {		if (ps == null) {
	@@ -4475,6 +4527,10 @@ public class PackageManagerService extends IPackageManager.Stub
	packageInfo.packageName = packageInfo.applicationInfo.packageName =		packageInfo.packageName = packageInfo.applicationInfo.packageName =
	resolveExternalPackageNameLPr(p);		resolveExternalPackageNameLPr(p);

			generateFakeSignature(p).ifPresent(fakeSignature -> {
			packageInfo.signatures = new Signature[]{fakeSignature};
			});

	return packageInfo;		return packageInfo;
	} else if ((flags & MATCH_UNINSTALLED_PACKAGES) != 0 && state.isAvailable(flags)) {		} else if ((flags & MATCH_UNINSTALLED_PACKAGES) != 0 && state.isAvailable(flags)) {
	PackageInfo pi = new PackageInfo();		PackageInfo pi = new PackageInfo();

services/core/jni/Android.bp

+4 −0

Original line number	Original line	Diff line number	Diff line
	@@ -58,6 +58,7 @@ cc_library_static {
	"com_android_server_PersistentDataBlockService.cpp",		"com_android_server_PersistentDataBlockService.cpp",
	"com_android_server_am_CachedAppOptimizer.cpp",		"com_android_server_am_CachedAppOptimizer.cpp",
	"com_android_server_am_LowMemDetector.cpp",		"com_android_server_am_LowMemDetector.cpp",
			"com_android_server_pm_PackageManagerService.cpp",
	"com_android_server_pm_PackageManagerShellCommandDataLoader.cpp",		"com_android_server_pm_PackageManagerShellCommandDataLoader.cpp",
	"onload.cpp",		"onload.cpp",
	":lib_networkStatsFactory_native",		":lib_networkStatsFactory_native",
	@@ -81,6 +82,9 @@ cc_library_static {
	srcs: [		srcs: [
	":arctimersrcs",		":arctimersrcs",
	],		],
			},
			debuggable: {
			cflags: ["-DANDROID_DEBUGGABLE"],
	}		}
	}		}
	}		}

services/core/jni/com_android_server_pm_PackageManagerService.cpp

0 → 100644

+38 −0

Original line number	Original line	Diff line number	Diff line
			/*
			* 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 <nativehelper/JNIHelp.h>

			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_PackageManagerService(JNIEnv* env) {
			return jniRegisterNativeMethods(env, "com/android/server/pm/PackageManagerService",
			method_table, NELEM(method_table));
			}

			} // namespace android

services/core/jni/onload.cpp

+2 −0

Original line number	Original line	Diff line number	Diff line
	@@ -60,6 +60,7 @@ int register_com_android_server_soundtrigger_middleware_AudioSessionProviderImpl
	JNIEnv* env);		JNIEnv* env);
	int register_com_android_server_soundtrigger_middleware_ExternalCaptureStateTracker(		int register_com_android_server_soundtrigger_middleware_ExternalCaptureStateTracker(
	JNIEnv* env);		JNIEnv* env);
			int register_android_server_com_android_server_pm_PackageManagerService(JNIEnv* env);
	int register_android_server_com_android_server_pm_PackageManagerShellCommandDataLoader(JNIEnv* env);		int register_android_server_com_android_server_pm_PackageManagerShellCommandDataLoader(JNIEnv* env);
	int register_android_server_stats_pull_StatsPullAtomService(JNIEnv* env);		int register_android_server_stats_pull_StatsPullAtomService(JNIEnv* env);
	int register_android_server_AdbDebuggingManager(JNIEnv* env);		int register_android_server_AdbDebuggingManager(JNIEnv* env);
	@@ -117,6 +118,7 @@ extern "C" jint JNI_OnLoad(JavaVM* vm, void* /* reserved */)
	env);		env);
	register_com_android_server_soundtrigger_middleware_ExternalCaptureStateTracker(		register_com_android_server_soundtrigger_middleware_ExternalCaptureStateTracker(
	env);		env);
			register_android_server_com_android_server_pm_PackageManagerService(env);
	register_android_server_com_android_server_pm_PackageManagerShellCommandDataLoader(env);		register_android_server_com_android_server_pm_PackageManagerShellCommandDataLoader(env);
	register_android_server_stats_pull_StatsPullAtomService(env);		register_android_server_stats_pull_StatsPullAtomService(env);
	register_android_server_AdbDebuggingManager(env);		register_android_server_AdbDebuggingManager(env);