Fix slice listener permissions (3a1d2e97) · Commits · e / os / android_frameworks_base

core/java/android/app/slice/SliceProvider.java

+22 −6

Original line number	Diff line number	Diff line
		@@ -147,6 +147,14 @@ public abstract class SliceProvider extends ContentProvider {
		* @hide
		*/
		public static final String EXTRA_OVERRIDE_PKG = "override_pkg";
		/**
		* @hide
		*/
		public static final String EXTRA_OVERRIDE_UID = "override_uid";
		/**
		* @hide
		*/
		public static final String EXTRA_OVERRIDE_PID = "override_pid";

		private static final boolean DEBUG = false;

		@@ -302,13 +310,20 @@ public abstract class SliceProvider extends ContentProvider {
		List<SliceSpec> supportedSpecs = extras.getParcelableArrayList(EXTRA_SUPPORTED_SPECS);

		String callingPackage = getCallingPackage();
		int callingUid = Binder.getCallingUid();
		int callingPid = Binder.getCallingPid();
		if (extras.containsKey(EXTRA_OVERRIDE_PKG)) {
		if (Binder.getCallingUid() != Process.SYSTEM_UID) {
		throw new SecurityException("Only the system can override calling pkg");
		}
		// This is safe because we would grant SYSTEM_UID access to all slices
		// and want to allow it to bind slices as if it were a less privileged app
		// to check their permission levels.
		callingPackage = extras.getString(EXTRA_OVERRIDE_PKG);
		callingUid = extras.getInt(EXTRA_OVERRIDE_UID);
		callingPid = extras.getInt(EXTRA_OVERRIDE_PID);
		}
		Slice s = handleBindSlice(uri, supportedSpecs, callingPackage);
		Slice s = handleBindSlice(uri, supportedSpecs, callingPackage, callingUid, callingPid);
		Bundle b = new Bundle();
		b.putParcelable(EXTRA_SLICE, s);
		return b;
		@@ -319,7 +334,8 @@ public abstract class SliceProvider extends ContentProvider {
		List<SliceSpec> supportedSpecs = extras.getParcelableArrayList(EXTRA_SUPPORTED_SPECS);
		Bundle b = new Bundle();
		if (uri != null) {
		Slice s = handleBindSlice(uri, supportedSpecs, getCallingPackage());
		Slice s = handleBindSlice(uri, supportedSpecs, getCallingPackage(),
		Binder.getCallingUid(), Binder.getCallingPid());
		b.putParcelable(EXTRA_SLICE, s);
		} else {
		b.putParcelable(EXTRA_SLICE, null);
		@@ -401,15 +417,15 @@ public abstract class SliceProvider extends ContentProvider {
		}

		private Slice handleBindSlice(Uri sliceUri, List<SliceSpec> supportedSpecs,
		String callingPkg) {
		String callingPkg, int callingUid, int callingPid) {
		// This can be removed once Slice#bindSlice is removed and everyone is using
		// SliceManager#bindSlice.
		String pkg = callingPkg != null ? callingPkg
		: getContext().getPackageManager().getNameForUid(Binder.getCallingUid());
		if (!UserHandle.isSameApp(Binder.getCallingUid(), Process.myUid())) {
		: getContext().getPackageManager().getNameForUid(callingUid);
		if (!UserHandle.isSameApp(callingUid, Process.myUid())) {
		try {
		mSliceManager.enforceSlicePermission(sliceUri, pkg,
		Binder.getCallingPid(), Binder.getCallingUid());
		callingPid, callingUid);
		} catch (SecurityException e) {
		return createPermissionSlice(getContext(), sliceUri, pkg);
		}

services/core/java/com/android/server/slice/PinnedSliceState.java

+98 −32

Original line number	Diff line number	Diff line
		@@ -14,12 +14,15 @@

		package com.android.server.slice;

		import static android.app.slice.SliceManager.PERMISSION_GRANTED;

		import android.app.slice.ISliceListener;
		import android.app.slice.Slice;
		import android.app.slice.SliceProvider;
		import android.app.slice.SliceSpec;
		import android.content.ContentProviderClient;
		import android.net.Uri;
		import android.os.Binder;
		import android.os.Bundle;
		import android.os.IBinder;
		import android.os.IBinder.DeathRecipient;
		@@ -51,18 +54,16 @@ public class PinnedSliceState {
		@GuardedBy("mLock")
		private final ArraySet<String> mPinnedPkgs = new ArraySet<>();
		@GuardedBy("mLock")
		private final ArrayMap<IBinder, ISliceListener> mListeners = new ArrayMap<>();
		private final ArrayMap<IBinder, ListenerInfo> mListeners = new ArrayMap<>();
		@GuardedBy("mLock")
		private SliceSpec[] mSupportedSpecs = null;
		@GuardedBy("mLock")
		private final ArrayMap<IBinder, String> mPkgMap = new ArrayMap<>();

		private final DeathRecipient mDeathRecipient = this::handleRecheckListeners;
		private boolean mSlicePinned;

		public PinnedSliceState(SliceManagerService service, Uri uri) {
		mService = service;
		mUri = uri;
		mService.getHandler().post(this::handleSendPinned);
		mLock = mService.getLock();
		}

		@@ -102,14 +103,27 @@ public class PinnedSliceState {
		}

		public void destroy() {
		mService.getHandler().post(this::handleSendUnpinned);
		setSlicePinned(false);
		}

		public void onChange() {
		mService.getHandler().post(this::handleBind);
		}

		public void addSliceListener(ISliceListener listener, String pkg, SliceSpec[] specs) {
		private void setSlicePinned(boolean pinned) {
		synchronized (mLock) {
		if (mSlicePinned == pinned) return;
		mSlicePinned = pinned;
		if (pinned) {
		mService.getHandler().post(this::handleSendPinned);
		} else {
		mService.getHandler().post(this::handleSendUnpinned);
		}
		}
		}

		public void addSliceListener(ISliceListener listener, String pkg, SliceSpec[] specs,
		boolean hasPermission) {
		synchronized (mLock) {
		if (mListeners.size() == 0) {
		mService.listen(mUri);
		@@ -118,26 +132,27 @@ public class PinnedSliceState {
		listener.asBinder().linkToDeath(mDeathRecipient, 0);
		} catch (RemoteException e) {
		}
		mListeners.put(listener.asBinder(), listener);
		mPkgMap.put(listener.asBinder(), pkg);
		mListeners.put(listener.asBinder(), new ListenerInfo(listener, pkg, hasPermission,
		Binder.getCallingUid(), Binder.getCallingPid()));
		mergeSpecs(specs);
		setSlicePinned(hasPermission);
		}
		}

		public boolean removeSliceListener(ISliceListener listener) {
		synchronized (mLock) {
		listener.asBinder().unlinkToDeath(mDeathRecipient, 0);
		mPkgMap.remove(listener.asBinder());
		if (mListeners.containsKey(listener.asBinder()) && mListeners.size() == 1) {
		mService.unlisten(mUri);
		}
		mListeners.remove(listener.asBinder());
		}
		return !isPinned();
		return !hasPinOrListener();
		}

		public void pin(String pkg, SliceSpec[] specs) {
		synchronized (mLock) {
		setSlicePinned(true);
		mPinnedPkgs.add(pkg);
		mergeSpecs(specs);
		}
		@@ -147,7 +162,7 @@ public class PinnedSliceState {
		synchronized (mLock) {
		mPinnedPkgs.remove(pkg);
		}
		return !isPinned();
		return !hasPinOrListener();
		}

		public boolean isListening() {
		@@ -156,8 +171,32 @@ public class PinnedSliceState {
		}
		}

		public void recheckPackage(String pkg) {
		synchronized (mLock) {
		for (int i = 0; i < mListeners.size(); i++) {
		ListenerInfo info = mListeners.valueAt(i);
		if (!info.hasPermission && Objects.equals(info.pkg, pkg)) {
		mService.getHandler().post(() -> {
		// This bind lets the app itself participate in the permission grant.
		Slice s = doBind(info);
		if (mService.checkAccess(info.pkg, mUri, info.callingUid, info.callingPid)
		== PERMISSION_GRANTED) {
		info.hasPermission = true;
		setSlicePinned(true);
		try {
		info.listener.onSliceUpdated(s);
		} catch (RemoteException e) {
		checkSelfRemove();
		}
		}
		});
		}
		}
		}
		}

		@VisibleForTesting
		public boolean isPinned() {
		public boolean hasPinOrListener() {
		synchronized (mLock) {
		return !mPinnedPkgs.isEmpty() \|\| !mListeners.isEmpty();
		}
		@@ -171,61 +210,66 @@ public class PinnedSliceState {
		return client;
		}

		private void checkSelfRemove() {
		if (!hasPinOrListener()) {
		// All the listeners died, remove from pinned state.
		mService.unlisten(mUri);
		mService.removePinnedSlice(mUri);
		}
		}

		private void handleRecheckListeners() {
		if (!isPinned()) return;
		if (!hasPinOrListener()) return;
		synchronized (mLock) {
		for (int i = mListeners.size() - 1; i >= 0; i--) {
		ISliceListener l = mListeners.valueAt(i);
		if (!l.asBinder().isBinderAlive()) {
		ListenerInfo l = mListeners.valueAt(i);
		if (!l.listener.asBinder().isBinderAlive()) {
		mListeners.removeAt(i);
		}
		}
		if (!isPinned()) {
		// All the listeners died, remove from pinned state.
		mService.unlisten(mUri);
		mService.removePinnedSlice(mUri);
		}
		checkSelfRemove();
		}
		}

		private void handleBind() {
		Slice cachedSlice = doBind(null);
		synchronized (mLock) {
		if (!isPinned()) return;
		if (!hasPinOrListener()) return;
		for (int i = mListeners.size() - 1; i >= 0; i--) {
		ISliceListener l = mListeners.valueAt(i);
		ListenerInfo info = mListeners.valueAt(i);
		Slice s = cachedSlice;
		if (s == null \|\| s.hasHint(Slice.HINT_CALLER_NEEDED)) {
		s = doBind(mPkgMap.get(l));
		if (s == null \|\| s.hasHint(Slice.HINT_CALLER_NEEDED)
		\|\| !info.hasPermission) {
		s = doBind(info);
		}
		if (s == null) {
		mListeners.removeAt(i);
		continue;
		}
		try {
		l.onSliceUpdated(s);
		info.listener.onSliceUpdated(s);
		} catch (RemoteException e) {
		Log.e(TAG, "Unable to notify slice " + mUri, e);
		mListeners.removeAt(i);
		continue;
		}
		}
		if (!isPinned()) {
		// All the listeners died, remove from pinned state.
		mService.unlisten(mUri);
		mService.removePinnedSlice(mUri);
		}
		checkSelfRemove();
		}
		}

		private Slice doBind(String overridePkg) {
		private Slice doBind(ListenerInfo info) {
		try (ContentProviderClient client = getClient()) {
		if (client == null) return null;
		Bundle extras = new Bundle();
		extras.putParcelable(SliceProvider.EXTRA_BIND_URI, mUri);
		extras.putParcelableArrayList(SliceProvider.EXTRA_SUPPORTED_SPECS,
		new ArrayList<>(Arrays.asList(mSupportedSpecs)));
		extras.putString(SliceProvider.EXTRA_OVERRIDE_PKG, overridePkg);
		if (info != null) {
		extras.putString(SliceProvider.EXTRA_OVERRIDE_PKG, info.pkg);
		extras.putInt(SliceProvider.EXTRA_OVERRIDE_UID, info.callingUid);
		extras.putInt(SliceProvider.EXTRA_OVERRIDE_PID, info.callingPid);
		}
		final Bundle res;
		try {
		res = client.call(SliceProvider.METHOD_SLICE, null, extras);
		@@ -236,6 +280,10 @@ public class PinnedSliceState {
		if (res == null) return null;
		Bundle.setDefusable(res, true);
		return res.getParcelable(SliceProvider.EXTRA_SLICE);
		} catch (Throwable t) {
		// Calling out of the system process, make sure they don't throw anything at us.
		Log.e(TAG, "Caught throwable while binding " + mUri, t);
		return null;
		}
		}

		@@ -264,4 +312,22 @@ public class PinnedSliceState {
		}
		}
		}

		private class ListenerInfo {

		private ISliceListener listener;
		private String pkg;
		private boolean hasPermission;
		private int callingUid;
		private int callingPid;

		public ListenerInfo(ISliceListener listener, String pkg, boolean hasPermission,
		int callingUid, int callingPid) {
		this.listener = listener;
		this.pkg = pkg;
		this.hasPermission = hasPermission;
		this.callingUid = callingUid;
		this.callingPid = callingPid;
		}
		}
		}

services/core/java/com/android/server/slice/SliceManagerService.java

+47 −31

Original line number	Diff line number	Diff line
		@@ -19,6 +19,8 @@ package com.android.server.slice;
		import static android.content.ContentProvider.getUriWithoutUserId;
		import static android.content.ContentProvider.getUserIdFromUri;
		import static android.content.ContentProvider.maybeAddUserId;
		import static android.content.pm.PackageManager.PERMISSION_DENIED;
		import static android.content.pm.PackageManager.PERMISSION_GRANTED;

		import android.Manifest.permission;
		import android.app.ActivityManager;
		@@ -32,7 +34,6 @@ import android.app.slice.SliceSpec;
		import android.content.ComponentName;
		import android.content.Context;
		import android.content.Intent;
		import android.content.pm.PackageManager;
		import android.content.pm.PackageManagerInternal;
		import android.content.pm.ResolveInfo;
		import android.database.ContentObserver;
		@@ -43,6 +44,7 @@ import android.os.IBinder;
		import android.os.Looper;
		import android.os.Process;
		import android.os.RemoteException;
		import android.os.UserHandle;
		import android.util.ArrayMap;
		import android.util.ArraySet;
		import android.util.Log;
		@@ -120,8 +122,10 @@ public class SliceManagerService extends ISliceManager.Stub {
		throws RemoteException {
		verifyCaller(pkg);
		uri = maybeAddUserId(uri, Binder.getCallingUserHandle().getIdentifier());
		enforceAccess(pkg, uri);
		getOrCreatePinnedSlice(uri).addSliceListener(listener, pkg, specs);
		enforceCrossUser(pkg, uri);
		getOrCreatePinnedSlice(uri).addSliceListener(listener, pkg, specs,
		checkAccess(pkg, uri, Binder.getCallingUid(), Binder.getCallingUid())
		== PERMISSION_GRANTED);
		}

		@Override
		@@ -129,7 +133,6 @@ public class SliceManagerService extends ISliceManager.Stub {
		throws RemoteException {
		verifyCaller(pkg);
		uri = maybeAddUserId(uri, Binder.getCallingUserHandle().getIdentifier());
		enforceAccess(pkg, uri);
		if (getPinnedSlice(uri).removeSliceListener(listener)) {
		removePinnedSlice(uri);
		}
		@@ -169,7 +172,7 @@ public class SliceManagerService extends ISliceManager.Stub {
		@Override
		public int checkSlicePermission(Uri uri, String pkg, int pid, int uid) throws RemoteException {
		if (mContext.checkUriPermission(uri, pid, uid, Intent.FLAG_GRANT_WRITE_URI_PERMISSION)
		== PackageManager.PERMISSION_GRANTED) {
		== PERMISSION_GRANTED) {
		return SliceManager.PERMISSION_GRANTED;
		}
		if (hasFullSliceAccess(pkg, uid)) {
		@@ -201,6 +204,11 @@ public class SliceManagerService extends ISliceManager.Stub {
		Binder.restoreCallingIdentity(ident);
		}
		}
		synchronized (mLock) {
		for (PinnedSliceState p : mPinnedSlicesByUri.values()) {
		p.recheckPackage(pkg);
		}
		}
		}

		/// ----- internal code -----
		@@ -249,17 +257,13 @@ public class SliceManagerService extends ISliceManager.Stub {
		return mHandler;
		}

		private void enforceAccess(String pkg, Uri uri) throws RemoteException {
		int user = Binder.getCallingUserHandle().getIdentifier();
		protected int checkAccess(String pkg, Uri uri, int uid, int pid) {
		int user = UserHandle.getUserId(uid);
		// Check for default launcher/assistant.
		if (!hasFullSliceAccess(pkg, Binder.getCallingUid())) {
		try {
		if (!hasFullSliceAccess(pkg, uid)) {
		// Also allow things with uri access.
		getContext().enforceUriPermission(uri, Binder.getCallingPid(),
		Binder.getCallingUid(),
		Intent.FLAG_GRANT_WRITE_URI_PERMISSION,
		"Slice binding requires permission to the Uri");
		} catch (SecurityException e) {
		if (getContext().checkUriPermission(uri, pid, uid,
		Intent.FLAG_GRANT_WRITE_URI_PERMISSION) != PERMISSION_GRANTED) {
		// Last fallback (if the calling app owns the authority, then it can have access).
		long ident = Binder.clearCallingIdentity();
		try {
		@@ -267,42 +271,54 @@ public class SliceManagerService extends ISliceManager.Stub {
		IActivityManager activityManager = ActivityManager.getService();
		ContentProviderHolder holder = null;
		String providerName = getUriWithoutUserId(uri).getAuthority();
		try {
		try {
		holder = activityManager.getContentProviderExternal(
		providerName, getUserIdFromUri(uri, user), token);
		if (holder == null \|\| holder.info == null
		\|\| !Objects.equals(holder.info.packageName, pkg)) {
		// No more fallbacks, no access.
		throw e;
		return PERMISSION_DENIED;
		}
		} finally {
		if (holder != null && holder.provider != null) {
		activityManager.removeContentProviderExternal(providerName, token);
		}
		}
		} catch (RemoteException e) {
		// Can't happen.
		e.rethrowAsRuntimeException();
		}
		} finally {
		// I know, the double finally seems ugly, but seems safest for the identity.
		Binder.restoreCallingIdentity(ident);
		}
		}
		}
		// Lastly check for any multi-userness. Any return statements above here will break this
		// important check.
		return PERMISSION_GRANTED;
		}

		private void enforceCrossUser(String pkg, Uri uri) {
		int user = Binder.getCallingUserHandle().getIdentifier();
		if (getUserIdFromUri(uri, user) != user) {
		getContext().enforceCallingOrSelfPermission(permission.INTERACT_ACROSS_USERS_FULL,
		"Slice interaction across users requires INTERACT_ACROSS_USERS_FULL");
		}
		}

		private void enforceAccess(String pkg, Uri uri) throws RemoteException {
		if (checkAccess(pkg, uri, Binder.getCallingUid(), Binder.getCallingPid())
		!= PERMISSION_GRANTED) {
		throw new SecurityException("Access to slice " + uri + " is required");
		}
		enforceCrossUser(pkg, uri);
		}

		private void enforceFullAccess(String pkg, String name, Uri uri) {
		int user = Binder.getCallingUserHandle().getIdentifier();
		if (!hasFullSliceAccess(pkg, user)) {
		throw new SecurityException(String.format("Call %s requires full slice access", name));
		}
		if (getUserIdFromUri(uri, user) != user) {
		getContext().enforceCallingOrSelfPermission(permission.INTERACT_ACROSS_USERS_FULL,
		"Slice interaction across users requires INTERACT_ACROSS_USERS_FULL");
		}
		enforceCrossUser(pkg, uri);
		}

		private void verifyCaller(String pkg) {

services/tests/uiservicestests/src/com/android/server/slice/PinnedSliceStateTest.java

+104 −28

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