Add resource based mechanism to grant default permissions am: 59020bffb7 (e3697a35) · Commits · e / os / android_frameworks_base

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

+212 −0

Original line number	Diff line number	Diff line
		@@ -17,6 +17,7 @@
		package com.android.server.pm;

		import android.Manifest;
		import android.annotation.NonNull;
		import android.app.DownloadManager;
		import android.app.admin.DevicePolicyManager;
		import android.content.Intent;
		@@ -30,6 +31,9 @@ import android.content.pm.ProviderInfo;
		import android.content.pm.ResolveInfo;
		import android.net.Uri;
		import android.os.Build;
		import android.os.Environment;
		import android.os.Handler;
		import android.os.Message;
		import android.os.UserHandle;
		import android.os.storage.StorageManager;
		import android.print.PrintManager;
		@@ -39,12 +43,23 @@ import android.provider.MediaStore;
		import android.provider.Telephony.Sms.Intents;
		import android.telephony.TelephonyManager;
		import android.security.Credentials;
		import android.util.ArrayMap;
		import android.util.ArraySet;
		import android.util.Log;
		import android.util.Slog;
		import android.util.Xml;
		import com.android.internal.util.XmlUtils;
		import org.xmlpull.v1.XmlPullParser;
		import org.xmlpull.v1.XmlPullParserException;

		import java.io.BufferedInputStream;
		import java.io.File;
		import java.io.FileInputStream;
		import java.io.IOException;
		import java.io.InputStream;
		import java.util.ArrayList;
		import java.util.List;
		import java.util.Map;
		import java.util.Set;

		import static android.os.Process.FIRST_APPLICATION_UID;
		@@ -65,6 +80,13 @@ final class DefaultPermissionGrantPolicy {

		private static final String AUDIO_MIME_TYPE = "audio/mpeg";

		private static final String TAG_EXCEPTIONS = "exceptions";
		private static final String TAG_EXCEPTION = "exception";
		private static final String TAG_PERMISSION = "permission";
		private static final String ATTR_PACKAGE = "package";
		private static final String ATTR_NAME = "name";
		private static final String ATTR_FIXED = "fixed";

		private static final Set<String> PHONE_PERMISSIONS = new ArraySet<>();
		static {
		PHONE_PERMISSIONS.add(Manifest.permission.READ_PHONE_STATE);
		@@ -126,7 +148,10 @@ final class DefaultPermissionGrantPolicy {
		STORAGE_PERMISSIONS.add(Manifest.permission.WRITE_EXTERNAL_STORAGE);
		}

		private static final int MSG_READ_DEFAULT_PERMISSION_EXCEPTIONS = 1;

		private final PackageManagerService mService;
		private final Handler mHandler;

		private PackagesProvider mLocationPackagesProvider;
		private PackagesProvider mVoiceInteractionPackagesProvider;
		@@ -135,8 +160,22 @@ final class DefaultPermissionGrantPolicy {
		private PackagesProvider mSimCallManagerPackagesProvider;
		private SyncAdapterPackagesProvider mSyncAdapterPackagesProvider;

		private ArrayMap<String, List<DefaultPermissionGrant>> mGrantExceptions;

		public DefaultPermissionGrantPolicy(PackageManagerService service) {
		mService = service;
		mHandler = new Handler(mService.mHandlerThread.getLooper()) {
		@Override
		public void handleMessage(Message msg) {
		if (msg.what == MSG_READ_DEFAULT_PERMISSION_EXCEPTIONS) {
		synchronized (mService.mPackages) {
		if (mGrantExceptions == null) {
		mGrantExceptions = readDefaultPermissionExceptionsLPw();
		}
		}
		}
		}
		};
		}

		public void setLocationPackagesProviderLPw(PackagesProvider provider) {
		@@ -166,6 +205,11 @@ final class DefaultPermissionGrantPolicy {
		public void grantDefaultPermissions(int userId) {
		grantPermissionsToSysComponentsAndPrivApps(userId);
		grantDefaultSystemHandlerPermissions(userId);
		grantDefaultPermissionExceptions(userId);
		}

		public void scheduleReadDefaultPermissionExceptions() {
		mHandler.sendEmptyMessage(MSG_READ_DEFAULT_PERMISSION_EXCEPTIONS);
		}

		private void grantPermissionsToSysComponentsAndPrivApps(int userId) {
		@@ -916,7 +960,175 @@ final class DefaultPermissionGrantPolicy {
		pkg.mSignatures) == PackageManager.SIGNATURE_MATCH;
		}

		private void grantDefaultPermissionExceptions(int userId) {
		synchronized (mService.mPackages) {
		mHandler.removeMessages(MSG_READ_DEFAULT_PERMISSION_EXCEPTIONS);

		if (mGrantExceptions == null) {
		mGrantExceptions = readDefaultPermissionExceptionsLPw();
		}

		// mGrantExceptions is null only before the first read and then
		// it serves as a cache of the default grants that should be
		// performed for every user. If there is an entry then the app
		// is on the system image and supports runtime permissions.
		Set<String> permissions = null;
		final int exceptionCount = mGrantExceptions.size();
		for (int i = 0; i < exceptionCount; i++) {
		String packageName = mGrantExceptions.keyAt(i);
		PackageParser.Package pkg = getSystemPackageLPr(packageName);
		List<DefaultPermissionGrant> permissionGrants = mGrantExceptions.valueAt(i);
		final int permissionGrantCount = permissionGrants.size();
		for (int j = 0; j < permissionGrantCount; j++) {
		DefaultPermissionGrant permissionGrant = permissionGrants.get(j);
		if (permissions == null) {
		permissions = new ArraySet<>();
		} else {
		permissions.clear();
		}
		permissions.add(permissionGrant.name);
		grantRuntimePermissionsLPw(pkg, permissions, false,
		permissionGrant.fixed, userId);
		}
		}
		}
		}

		private @NonNull ArrayMap<String, List<DefaultPermissionGrant>>
		readDefaultPermissionExceptionsLPw() {
		File dir = new File(Environment.getRootDirectory(), "etc/default-permissions");
		if (!dir.exists() \|\| !dir.isDirectory() \|\| !dir.canRead()) {
		return new ArrayMap<>(0);
		}

		File[] files = dir.listFiles();
		if (files == null) {
		return new ArrayMap<>(0);
		}

		ArrayMap<String, List<DefaultPermissionGrant>> grantExceptions = new ArrayMap<>();

		// Iterate over the files in the directory and scan .xml files
		for (File file : files) {
		if (!file.getPath().endsWith(".xml")) {
		Slog.i(TAG, "Non-xml file " + file + " in " + dir + " directory, ignoring");
		continue;
		}
		if (!file.canRead()) {
		Slog.w(TAG, "Default permissions file " + file + " cannot be read");
		continue;
		}
		try (
		InputStream str = new BufferedInputStream(new FileInputStream(file))
		) {
		XmlPullParser parser = Xml.newPullParser();
		parser.setInput(str, null);
		parse(parser, grantExceptions);
		} catch (XmlPullParserException \| IOException e) {
		Slog.w(TAG, "Error reading default permissions file " + file, e);
		}
		}

		return grantExceptions;
		}

		private void parse(XmlPullParser parser, Map<String, List<DefaultPermissionGrant>>
		outGrantExceptions) throws IOException, XmlPullParserException {
		final int outerDepth = parser.getDepth();
		int type;
		while ((type = parser.next()) != XmlPullParser.END_DOCUMENT
		&& (type != XmlPullParser.END_TAG \|\| parser.getDepth() > outerDepth)) {
		if (type == XmlPullParser.END_TAG \|\| type == XmlPullParser.TEXT) {
		continue;
		}
		if (TAG_EXCEPTIONS.equals(parser.getName())) {
		parseExceptions(parser, outGrantExceptions);
		} else {
		Log.e(TAG, "Unknown tag " + parser.getName());
		}
		}
		}

		private void parseExceptions(XmlPullParser parser, Map<String, List<DefaultPermissionGrant>>
		outGrantExceptions) throws IOException, XmlPullParserException {
		final int outerDepth = parser.getDepth();
		int type;
		while ((type = parser.next()) != XmlPullParser.END_DOCUMENT
		&& (type != XmlPullParser.END_TAG \|\| parser.getDepth() > outerDepth)) {
		if (type == XmlPullParser.END_TAG \|\| type == XmlPullParser.TEXT) {
		continue;
		}
		if (TAG_EXCEPTION.equals(parser.getName())) {
		String packageName = parser.getAttributeValue(null, ATTR_PACKAGE);

		List<DefaultPermissionGrant> packageExceptions =
		outGrantExceptions.get(packageName);
		if (packageExceptions == null) {
		// The package must be on the system image
		PackageParser.Package pkg = getSystemPackageLPr(packageName);
		if (pkg == null) {
		Log.w(TAG, "Unknown package:" + packageName);
		XmlUtils.skipCurrentTag(parser);
		return;
		}

		// The package must support runtime permissions
		if (!doesPackageSupportRuntimePermissions(pkg)) {
		Log.w(TAG, "Skipping non supporting runtime permissions package:"
		+ packageName);
		XmlUtils.skipCurrentTag(parser);
		return;
		}
		packageExceptions = new ArrayList<>();
		outGrantExceptions.put(packageName, packageExceptions);
		}

		parsePermission(parser, packageExceptions);
		} else {
		Log.e(TAG, "Unknown tag " + parser.getName() + "under <exceptions>");
		}
		}
		}

		private void parsePermission(XmlPullParser parser, List<DefaultPermissionGrant>
		outPackageExceptions) throws IOException, XmlPullParserException {
		final int outerDepth = parser.getDepth();
		int type;
		while ((type = parser.next()) != XmlPullParser.END_DOCUMENT
		&& (type != XmlPullParser.END_TAG \|\| parser.getDepth() > outerDepth)) {
		if (type == XmlPullParser.END_TAG \|\| type == XmlPullParser.TEXT) {
		continue;
		}

		if (TAG_PERMISSION.contains(parser.getName())) {
		String name = parser.getAttributeValue(null, ATTR_NAME);
		if (name == null) {
		Log.w(TAG, "Mandatory name attribute missing for permission tag");
		XmlUtils.skipCurrentTag(parser);
		continue;
		}

		final boolean fixed = XmlUtils.readBooleanAttribute(parser, ATTR_FIXED);

		DefaultPermissionGrant exception = new DefaultPermissionGrant(name, fixed);
		outPackageExceptions.add(exception);
		} else {
		Log.e(TAG, "Unknown tag " + parser.getName() + "under <exception>");
		}
		}
		}

		private static boolean doesPackageSupportRuntimePermissions(PackageParser.Package pkg) {
		return pkg.applicationInfo.targetSdkVersion > Build.VERSION_CODES.LOLLIPOP_MR1;
		}

		private static final class DefaultPermissionGrant {
		final String name;
		final boolean fixed;

		public DefaultPermissionGrant(String name, boolean fixed) {
		this.name = name;
		this.fixed = fixed;
		}
		}
		}

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

+10 −4

Original line number	Diff line number	Diff line
		@@ -35,7 +35,6 @@ import static android.content.pm.PackageManager.FLAG_PERMISSION_USER_SET;
		import static android.content.pm.PackageManager.INSTALL_EXTERNAL;
		import static android.content.pm.PackageManager.INSTALL_FAILED_ALREADY_EXISTS;
		import static android.content.pm.PackageManager.INSTALL_FAILED_CONFLICTING_PROVIDER;
		import static android.content.pm.PackageManager.INSTALL_FAILED_DEXOPT;
		import static android.content.pm.PackageManager.INSTALL_FAILED_DUPLICATE_PACKAGE;
		import static android.content.pm.PackageManager.INSTALL_FAILED_DUPLICATE_PERMISSION;
		import static android.content.pm.PackageManager.INSTALL_FAILED_EPHEMERAL_INVALID;
		@@ -101,7 +100,6 @@ import static com.android.server.pm.PermissionsState.PERMISSION_OPERATION_SUCCES
		import android.Manifest;
		import android.annotation.NonNull;
		import android.annotation.Nullable;
		import android.annotation.UserIdInt;
		import android.app.ActivityManager;
		import android.app.ActivityManagerNative;
		import android.app.IActivityManager;
		@@ -737,8 +735,7 @@ public class PackageManagerService extends IPackageManager.Stub {
		final SparseArray<IntentFilterVerificationState> mIntentFilterVerificationStates
		= new SparseArray<IntentFilterVerificationState>();

		final DefaultPermissionGrantPolicy mDefaultPermissionPolicy =
		new DefaultPermissionGrantPolicy(this);
		final DefaultPermissionGrantPolicy mDefaultPermissionPolicy;

		// List of packages names to keep cached, even if they are uninstalled for all users
		private List<String> mKeepUninstalledPackages;
		@@ -2115,6 +2112,8 @@ public class PackageManagerService extends IPackageManager.Stub {
		mProcessLoggingHandler = new ProcessLoggingHandler();
		Watchdog.getInstance().addThread(mHandler, WATCHDOG_TIMEOUT);

		mDefaultPermissionPolicy = new DefaultPermissionGrantPolicy(this);

		File dataDir = Environment.getDataDirectory();
		mAppInstallDir = new File(dataDir, "app");
		mAppLib32InstallDir = new File(dataDir, "app-lib");
		@@ -17937,6 +17936,13 @@ Slog.v(TAG, ":: stepped forward, applying functor at tag " + parser.getName());
		mDefaultPermissionPolicy.grantDefaultPermissions(userId);
		}

		// If we did not grant default permissions, we preload from this the
		// default permission exceptions lazily to ensure we don't hit the
		// disk on a new user creation.
		if (grantPermissionsUserIds == EMPTY_INT_ARRAY) {
		mDefaultPermissionPolicy.scheduleReadDefaultPermissionExceptions();
		}

		// Kick off any messages waiting for system ready
		if (mPostSystemReadyMessages != null) {
		for (Message msg : mPostSystemReadyMessages) {