Merge "Ensure app op restrictions reset when the app that set them dies." into nyc-dev (008d73bd) · Commits · e / os / android_frameworks_base

core/java/com/android/internal/util/ArrayUtils.java

+7 −0

Original line number	Diff line number	Diff line
		@@ -161,6 +161,13 @@ public class ArrayUtils {
		return array == null \|\| array.length == 0;
		}

		/**
		* Checks if given array is null or has zero elements.
		*/
		public static boolean isEmpty(@Nullable boolean[] array) {
		return array == null \|\| array.length == 0;
		}

		/**
		* Checks that value is present as at least one of the elements of the array.
		* @param array the array to check in

services/core/java/com/android/server/AppOpsService.java

+160 −188

Original line number	Diff line number	Diff line
		@@ -25,6 +25,7 @@ import java.io.IOException;
		import java.io.PrintWriter;
		import java.nio.charset.StandardCharsets;
		import java.util.ArrayList;
		import java.util.Arrays;
		import java.util.Collections;
		import java.util.HashMap;
		import java.util.Iterator;
		@@ -57,7 +58,6 @@ import android.util.ArrayMap;
		import android.util.ArraySet;
		import android.util.AtomicFile;
		import android.util.Log;
		import android.util.Pair;
		import android.util.Slog;
		import android.util.SparseArray;
		import android.util.SparseIntArray;
		@@ -110,21 +110,8 @@ public class AppOpsService extends IAppOpsService.Stub {

		/*
		* These are app op restrictions imposed per user from various parties.
		*
		* This is organized as follows:
		*
		* ArrayMap w/ mapping:
		* IBinder (for client imposing restriction) --> SparseArray w/ mapping:
		* User handle --> Pair containing:
		* - Array w/ index = AppOp code, value = restricted status boolean
		* - SparseArray w/ mapping:
		* AppOp code --> Set of packages that are not restricted for this code
		*
		* For efficiency, a core assumption here is that the number of per-package exemptions stored
		* here will be relatively small. If this changes, this data structure should be revisited.
		*/
		private final ArrayMap<IBinder, SparseArray<Pair<boolean[], SparseArray<ArraySet<String>>>>>
		mOpUserRestrictions = new ArrayMap<>();
		private final ArrayMap<IBinder, ClientRestrictionState> mOpUserRestrictions = new ArrayMap<>();

		private static final class UidState {
		public final int uid;
		@@ -1328,33 +1315,9 @@ public class AppOpsService extends IAppOpsService.Stub {
		for (int i = 0; i < restrictionSetCount; i++) {
		// For each client, check that the given op is not restricted, or that the given
		// package is exempt from the restriction.

		SparseArray<Pair<boolean[],SparseArray<ArraySet<String>>>> perUserRestrictions =
		mOpUserRestrictions.valueAt(i);

		Pair<boolean[],SparseArray<ArraySet<String>>> restrictions =
		perUserRestrictions.get(userHandle);
		if (restrictions == null) {
		continue; // No restrictions set by this client
		}

		boolean[] opRestrictions = restrictions.first;
		SparseArray<ArraySet<String>> opExceptions = restrictions.second;

		if (opRestrictions == null) {
		continue; // No restrictions set by this client
		}

		if (opRestrictions[code]) {

		if (opExceptions != null) {
		ArraySet<String> ex = opExceptions.get(code);
		if (ex != null && ex.contains(packageName)) {
		continue; // AppOps code is restricted, but this package is exempt
		}
		}

		if (AppOpsManager.opAllowSystemBypassRestriction(code)) {
		ClientRestrictionState restrictionState = mOpUserRestrictions.valueAt(i);
		if (restrictionState.hasRestriction(code, packageName, userHandle)
		&& AppOpsManager.opAllowSystemBypassRestriction(code)) {
		// If we are the system, bypass user restrictions for certain codes
		synchronized (this) {
		Ops ops = getOpsRawLocked(uid, packageName, true);
		@@ -1362,8 +1325,6 @@ public class AppOpsService extends IAppOpsService.Stub {
		return false;
		}
		}
		}

		return true;
		}
		}
		@@ -2216,12 +2177,11 @@ public class AppOpsService extends IAppOpsService.Stub {
		checkSystemUid("setUserRestrictions");
		Preconditions.checkNotNull(restrictions);
		Preconditions.checkNotNull(token);
		final boolean[] opRestrictions = getOrCreateUserRestrictionsForToken(token, userHandle);
		for (int i = 0; i < opRestrictions.length; ++i) {
		for (int i = 0; i < AppOpsManager._NUM_OP; i++) {
		String restriction = AppOpsManager.opToRestriction(i);
		final boolean restricted = restriction != null
		&& restrictions.getBoolean(restriction, false);
		setUserRestrictionNoCheck(i, restricted, token, userHandle);
		if (restriction != null && restrictions.getBoolean(restriction, false)) {
		setUserRestrictionNoCheck(i, true, token, userHandle, null);
		}
		}
		}

		@@ -2246,48 +2206,29 @@ public class AppOpsService extends IAppOpsService.Stub {
		setUserRestrictionNoCheck(code, restricted, token, userHandle, exceptionPackages);
		}

		private void setUserRestrictionNoCheck(int code, boolean restricted, IBinder token,
		int userHandle) {
		setUserRestrictionNoCheck(code, restricted, token, userHandle, /exceptionPackages/null);
		}

		private void setUserRestrictionNoCheck(int code, boolean restricted, IBinder token,
		int userHandle, String[] exceptionPackages) {
		ClientRestrictionState restrictionState = mOpUserRestrictions.get(token);

		final boolean[] opRestrictions = getOrCreateUserRestrictionsForToken(token, userHandle);

		if (restricted) {
		final SparseArray<ArraySet<String>> opExceptions =
		getUserPackageExemptionsForToken(token, userHandle);

		ArraySet<String> exceptions = opExceptions.get(code);
		if (exceptionPackages != null && exceptionPackages.length > 0) {
		if (exceptions == null) {
		exceptions = new ArraySet<>(exceptionPackages.length);
		opExceptions.put(code, exceptions);
		} else {
		exceptions.clear();
		}

		for (String p : exceptionPackages) {
		exceptions.add(p);
		}
		} else {
		opExceptions.remove(code);
		}
		}

		if (opRestrictions[code] == restricted) {
		if (restrictionState == null) {
		try {
		restrictionState = new ClientRestrictionState(token);
		} catch (RemoteException e) {
		return;
		}
		opRestrictions[code] = restricted;
		if (!restricted) {
		pruneUserRestrictionsForToken(token, userHandle);
		mOpUserRestrictions.put(token, restrictionState);
		}

		if (restrictionState.setRestriction(code, restricted, exceptionPackages, userHandle)) {
		notifyWatchersOfChange(code);
		}

		if (restrictionState.isDefault()) {
		mOpUserRestrictions.remove(token);
		restrictionState.destroy();
		}
		}

		private void notifyWatchersOfChange(int code) {
		final ArrayList<Callback> clonedCallbacks;
		synchronized (this) {
		@@ -2300,7 +2241,7 @@ public class AppOpsService extends IAppOpsService.Stub {

		// There are components watching for mode changes such as window manager
		// and location manager which are in our process. The callbacks in these
		// components may require permissions our remote caller does not have.
		// components may require permissions our remote caller does not have.s
		final long identity = Binder.clearCallingIdentity();
		try {
		final int callbackCount = clonedCallbacks.size();
		@@ -2322,138 +2263,169 @@ public class AppOpsService extends IAppOpsService.Stub {
		checkSystemUid("removeUser");
		final int tokenCount = mOpUserRestrictions.size();
		for (int i = tokenCount - 1; i >= 0; i--) {
		SparseArray<Pair<boolean[], SparseArray<ArraySet<String>>>> opRestrictions =
		mOpUserRestrictions.valueAt(i);
		if (opRestrictions != null) {
		opRestrictions.remove(userHandle);
		if (opRestrictions.size() <= 0) {
		mOpUserRestrictions.removeAt(i);
		ClientRestrictionState opRestrictions = mOpUserRestrictions.valueAt(i);
		opRestrictions.removeUser(userHandle);
		}
		}

		private void checkSystemUid(String function) {
		int uid = Binder.getCallingUid();
		if (uid != Process.SYSTEM_UID) {
		throw new SecurityException(function + " must by called by the system");
		}
		}

		private static String resolvePackageName(int uid, String packageName) {
		if (uid == 0) {
		return "root";
		} else if (uid == Process.SHELL_UID) {
		return "com.android.shell";
		} else if (uid == Process.SYSTEM_UID && packageName == null) {
		return "android";
		}
		return packageName;
		}

		private void pruneUserRestrictionsForToken(IBinder token, int userHandle) {
		SparseArray<Pair<boolean[], SparseArray<ArraySet<String>>>> perTokenRestrictions =
		mOpUserRestrictions.get(token);
		if (perTokenRestrictions != null) {
		final Pair<boolean[], SparseArray<ArraySet<String>>> restrictions =
		perTokenRestrictions.get(userHandle);

		if (restrictions != null) {
		final boolean[] opRestrictions = restrictions.first;
		final SparseArray<ArraySet<String>> opExceptions = restrictions.second;
		boolean stillHasRestrictions = false;
		if (opRestrictions != null) {
		for (int i = 0; i < opRestrictions.length; i++) {
		boolean restriction = opRestrictions[i];
		if (restriction) {
		stillHasRestrictions = true;
		} else {
		opExceptions.remove(i);
		private static String[] getPackagesForUid(int uid) {
		String[] packageNames = null;
		try {
		packageNames = AppGlobals.getPackageManager().getPackagesForUid(uid);
		} catch (RemoteException e) {
		/* ignore - local call */
		}
		if (packageNames == null) {
		return EmptyArray.STRING;
		}
		return packageNames;
		}

		if (stillHasRestrictions) {
		return;
		private final class ClientRestrictionState implements DeathRecipient {
		private final IBinder token;
		SparseArray<boolean[]> perUserRestrictions;
		SparseArray<String[]> perUserExcludedPackages;

		public ClientRestrictionState(IBinder token)
		throws RemoteException {
		token.linkToDeath(this, 0);
		this.token = token;
		}

		// No restrictions set for this client
		perTokenRestrictions.remove(userHandle);
		if (perTokenRestrictions.size() <= 0) {
		mOpUserRestrictions.remove(token);
		public boolean setRestriction(int code, boolean restricted,
		String[] excludedPackages, int userId) {
		boolean changed = false;

		if (perUserRestrictions == null && restricted) {
		perUserRestrictions = new SparseArray<>();
		}

		if (perUserRestrictions != null) {
		boolean[] userRestrictions = perUserRestrictions.get(userId);
		if (userRestrictions == null && restricted) {
		userRestrictions = new boolean[AppOpsManager._NUM_OP];
		perUserRestrictions.put(userId, userRestrictions);
		}
		if (userRestrictions != null && userRestrictions[code] != restricted) {
		userRestrictions[code] = restricted;
		if (!restricted && isDefault(userRestrictions)) {
		perUserRestrictions.remove(userId);
		userRestrictions = null;
		}
		changed = true;
		}

		/**
		* Get or create the user restrictions array for a given client if it doesn't already exist.
		*
		* @param token the binder client creating the restriction.
		* @param userHandle the user handle to create a restriction for.
		*
		* @return the array of restriction states for each AppOps code.
		*/
		private boolean[] getOrCreateUserRestrictionsForToken(IBinder token, int userHandle) {
		SparseArray<Pair<boolean[], SparseArray<ArraySet<String>>>> perTokenRestrictions =
		mOpUserRestrictions.get(token);

		if (perTokenRestrictions == null) {
		perTokenRestrictions =
		new SparseArray<Pair<boolean[], SparseArray<ArraySet<String>>>>();
		mOpUserRestrictions.put(token, perTokenRestrictions);
		if (userRestrictions != null) {
		final boolean noExcludedPackages = ArrayUtils.isEmpty(excludedPackages);
		if (perUserExcludedPackages == null && !noExcludedPackages) {
		perUserExcludedPackages = new SparseArray<>();
		}
		if (perUserExcludedPackages != null && !Arrays.equals(excludedPackages,
		perUserExcludedPackages.get(userId))) {
		if (noExcludedPackages) {
		perUserExcludedPackages.remove(userId);
		if (perUserExcludedPackages.size() <= 0) {
		perUserExcludedPackages = null;
		}
		} else {
		perUserExcludedPackages.put(userId, excludedPackages);
		}
		changed = true;
		}
		}
		}

		Pair<boolean[], SparseArray<ArraySet<String>>> restrictions =
		perTokenRestrictions.get(userHandle);
		return changed;
		}

		public boolean hasRestriction(int restriction, String packageName, int userId) {
		if (perUserRestrictions == null) {
		return false;
		}
		boolean[] restrictions = perUserRestrictions.get(userId);
		if (restrictions == null) {
		restrictions = new Pair<boolean[], SparseArray<ArraySet<String>>>(
		new boolean[AppOpsManager._NUM_OP], new SparseArray<ArraySet<String>>());
		perTokenRestrictions.put(userHandle, restrictions);
		return false;
		}

		return restrictions.first;
		if (!restrictions[restriction]) {
		return false;
		}

		/**
		* Get the per-package exemptions for each AppOps code for a given client and userHandle.
		*
		* @param token the binder client to get the exemptions for.
		* @param userHandle the user handle to get the exemptions for.
		*
		* @return a mapping from the AppOps code to a set of packages exempt for that code.
		*/
		private SparseArray<ArraySet<String>> getUserPackageExemptionsForToken(IBinder token,
		int userHandle) {
		SparseArray<Pair<boolean[], SparseArray<ArraySet<String>>>> perTokenRestrictions =
		mOpUserRestrictions.get(token);

		if (perTokenRestrictions == null) {
		return null; // Don't create user restrictions accidentally
		if (perUserExcludedPackages == null) {
		return true;
		}
		String[] perUserExclusions = perUserExcludedPackages.get(userId);
		if (perUserExclusions == null) {
		return true;
		}
		return !ArrayUtils.contains(perUserExclusions, packageName);
		}

		Pair<boolean[], SparseArray<ArraySet<String>>> restrictions =
		perTokenRestrictions.get(userHandle);

		if (restrictions == null) {
		return null; // Don't create user restrictions accidentally
		public void removeUser(int userId) {
		if (perUserExcludedPackages != null) {
		perUserExcludedPackages.remove(userId);
		if (perUserExcludedPackages.size() <= 0) {
		perUserExcludedPackages = null;
		}
		}
		}

		return restrictions.second;
		public boolean isDefault() {
		return perUserRestrictions == null \|\| perUserRestrictions.size() <= 0;
		}

		private void checkSystemUid(String function) {
		int uid = Binder.getCallingUid();
		if (uid != Process.SYSTEM_UID) {
		throw new SecurityException(function + " must by called by the system");
		@Override
		public void binderDied() {
		synchronized (AppOpsService.this) {
		mOpUserRestrictions.remove(token);
		if (perUserRestrictions == null) {
		return;
		}
		final int userCount = perUserRestrictions.size();
		for (int i = 0; i < userCount; i++) {
		final boolean[] restrictions = perUserRestrictions.valueAt(i);
		final int restrictionCount = restrictions.length;
		for (int j = 0; j < restrictionCount; j++) {
		if (restrictions[j]) {
		final int changedCode = j;
		mHandler.post(() -> notifyWatchersOfChange(changedCode));
		}

		private static String resolvePackageName(int uid, String packageName) {
		if (uid == 0) {
		return "root";
		} else if (uid == Process.SHELL_UID) {
		return "com.android.shell";
		} else if (uid == Process.SYSTEM_UID && packageName == null) {
		return "android";
		}
		return packageName;
		}
		destroy();
		}
		}

		private static String[] getPackagesForUid(int uid) {
		String[] packageNames = null;
		try {
		packageNames = AppGlobals.getPackageManager().getPackagesForUid(uid);
		} catch (RemoteException e) {
		/* ignore - local call */
		public void destroy() {
		token.unlinkToDeath(this, 0);
		}
		if (packageNames == null) {
		return EmptyArray.STRING;

		private boolean isDefault(boolean[] array) {
		if (ArrayUtils.isEmpty(array)) {
		return true;
		}
		for (boolean value : array) {
		if (value) {
		return false;
		}
		}
		return true;
		}
		return packageNames;
		}
		}