Slice permissions++ (bf3eedcc) · Commits · e / os / android_frameworks_base

core/java/android/app/slice/ISliceManager.aidl

+7 −3

Original line number	Diff line number	Diff line
		@@ -25,11 +25,15 @@ interface ISliceManager {
		void unpinSlice(String pkg, in Uri uri, in IBinder token);
		boolean hasSliceAccess(String pkg);
		SliceSpec[] getPinnedSpecs(in Uri uri, String pkg);
		int checkSlicePermission(in Uri uri, String pkg, int pid, int uid,
		in String[] autoGrantPermissions);
		void grantPermissionFromUser(in Uri uri, String pkg, String callingPkg, boolean allSlices);
		Uri[] getPinnedSlices(String pkg);

		byte[] getBackupPayload(int user);
		void applyRestore(in byte[] payload, int user);

		// Perms.
		void grantSlicePermission(String callingPkg, String toPkg, in Uri uri);
		void revokeSlicePermission(String callingPkg, String toPkg, in Uri uri);
		int checkSlicePermission(in Uri uri, String pkg, int pid, int uid,
		in String[] autoGrantPermissions);
		void grantPermissionFromUser(in Uri uri, String pkg, String callingPkg, boolean allSlices);
		}

core/java/android/app/slice/SliceManager.java

+17 −39

Original line number	Diff line number	Diff line
		@@ -16,6 +16,8 @@

		package android.app.slice;

		import static android.content.pm.PackageManager.PERMISSION_DENIED;

		import android.annotation.NonNull;
		import android.annotation.Nullable;
		import android.annotation.SdkConstant;
		@@ -100,22 +102,6 @@ public class SliceManager {
		private final Context mContext;
		private final IBinder mToken = new Binder();

		/**
		* Permission denied.
		* @hide
		*/
		public static final int PERMISSION_DENIED = -1;
		/**
		* Permission granted.
		* @hide
		*/
		public static final int PERMISSION_GRANTED = 0;
		/**
		* Permission just granted by the user, and should be granted uri permission as well.
		* @hide
		*/
		public static final int PERMISSION_USER_GRANTED = 1;

		/**
		* @hide
		*/
		@@ -417,9 +403,11 @@ public class SliceManager {
		* @see #grantSlicePermission(String, Uri)
		*/
		public @PermissionResult int checkSlicePermission(@NonNull Uri uri, int pid, int uid) {
		// TODO: Switch off Uri permissions.
		return mContext.checkUriPermission(uri, pid, uid,
		Intent.FLAG_GRANT_WRITE_URI_PERMISSION);
		try {
		return mService.checkSlicePermission(uri, null, pid, uid, null);
		} catch (RemoteException e) {
		throw e.rethrowFromSystemServer();
		}
		}

		/**
		@@ -431,11 +419,11 @@ public class SliceManager {
		* @see #revokeSlicePermission
		*/
		public void grantSlicePermission(@NonNull String toPackage, @NonNull Uri uri) {
		// TODO: Switch off Uri permissions.
		mContext.grantUriPermission(toPackage, uri,
		Intent.FLAG_GRANT_PERSISTABLE_URI_PERMISSION
		\| Intent.FLAG_GRANT_WRITE_URI_PERMISSION
		\| Intent.FLAG_GRANT_PREFIX_URI_PERMISSION);
		try {
		mService.grantSlicePermission(mContext.getPackageName(), toPackage, uri);
		} catch (RemoteException e) {
		throw e.rethrowFromSystemServer();
		}
		}

		/**
		@@ -453,11 +441,11 @@ public class SliceManager {
		* @see #grantSlicePermission
		*/
		public void revokeSlicePermission(@NonNull String toPackage, @NonNull Uri uri) {
		// TODO: Switch off Uri permissions.
		mContext.revokeUriPermission(toPackage, uri,
		Intent.FLAG_GRANT_PERSISTABLE_URI_PERMISSION
		\| Intent.FLAG_GRANT_WRITE_URI_PERMISSION
		\| Intent.FLAG_GRANT_PREFIX_URI_PERMISSION);
		try {
		mService.revokeSlicePermission(mContext.getPackageName(), toPackage, uri);
		} catch (RemoteException e) {
		throw e.rethrowFromSystemServer();
		}
		}

		/**
		@@ -478,16 +466,6 @@ public class SliceManager {
		throw new SecurityException("User " + uid + " does not have slice permission for "
		+ uri + ".");
		}
		if (result == PERMISSION_USER_GRANTED) {
		// We just had a user grant of this permission and need to grant this to the app
		// permanently.
		mContext.grantUriPermission(pkg, uri.buildUpon().path("").build(),
		Intent.FLAG_GRANT_PERSISTABLE_URI_PERMISSION
		\| Intent.FLAG_GRANT_WRITE_URI_PERMISSION
		\| Intent.FLAG_GRANT_PREFIX_URI_PERMISSION);
		// Notify a change has happened because we just granted a permission.
		mContext.getContentResolver().notifyChange(uri, null);
		}
		} catch (RemoteException e) {
		throw e.rethrowFromSystemServer();
		}

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

0 → 100644

+35 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2018 The Android Open Source 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.
		*/

		package com.android.server.slice;

		import org.xmlpull.v1.XmlSerializer;

		import java.io.IOException;

		/**
		* A parent object that cares when a Persistable changes and will schedule a serialization
		* in response to the onPersistableDirty callback.
		*/
		public interface DirtyTracker {
		void onPersistableDirty(Persistable obj);

		/**
		* An object that can be written to XML.
		*/
		interface Persistable {
		String getFileName();
		void writeTo(XmlSerializer out) throws IOException;
		}
		}

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

0 → 100644

+354 −0

Original line number	Diff line number	Diff line
		/*
		* Copyright (C) 2018 The Android Open Source 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.
		*/

		package com.android.server.slice;

		import android.annotation.NonNull;
		import android.content.ContentResolver;
		import android.net.Uri;
		import android.text.TextUtils;
		import android.util.ArrayMap;
		import android.util.ArraySet;
		import android.util.Slog;

		import com.android.server.slice.DirtyTracker.Persistable;
		import com.android.server.slice.SlicePermissionManager.PkgUser;

		import org.xmlpull.v1.XmlPullParser;
		import org.xmlpull.v1.XmlPullParserException;
		import org.xmlpull.v1.XmlSerializer;

		import java.io.IOException;
		import java.util.ArrayList;
		import java.util.Collection;
		import java.util.Comparator;
		import java.util.List;
		import java.util.Objects;
		import java.util.stream.Collectors;

		public class SliceClientPermissions implements DirtyTracker, Persistable {

		private static final String TAG = "SliceClientPermissions";

		static final String TAG_CLIENT = "client";
		private static final String TAG_AUTHORITY = "authority";
		private static final String TAG_PATH = "path";
		private static final String NAMESPACE = null;

		private static final String ATTR_PKG = "pkg";
		private static final String ATTR_AUTHORITY = "authority";
		private static final String ATTR_FULL_ACCESS = "fullAccess";

		private final PkgUser mPkg;
		// Keyed off (authority, userId) rather than the standard (pkg, userId)
		private final ArrayMap<PkgUser, SliceAuthority> mAuths = new ArrayMap<>();
		private final DirtyTracker mTracker;
		private boolean mHasFullAccess;

		public SliceClientPermissions(@NonNull PkgUser pkg, @NonNull DirtyTracker tracker) {
		mPkg = pkg;
		mTracker = tracker;
		}

		public PkgUser getPkg() {
		return mPkg;
		}

		public synchronized Collection<SliceAuthority> getAuthorities() {
		return new ArrayList<>(mAuths.values());
		}

		public synchronized SliceAuthority getOrCreateAuthority(PkgUser authority, PkgUser provider) {
		SliceAuthority ret = mAuths.get(authority);
		if (ret == null) {
		ret = new SliceAuthority(authority.getPkg(), provider, this);
		mAuths.put(authority, ret);
		onPersistableDirty(ret);
		}
		return ret;
		}

		public synchronized SliceAuthority getAuthority(PkgUser authority) {
		return mAuths.get(authority);
		}

		public boolean hasFullAccess() {
		return mHasFullAccess;
		}

		public void setHasFullAccess(boolean hasFullAccess) {
		if (mHasFullAccess == hasFullAccess) return;
		mHasFullAccess = hasFullAccess;
		mTracker.onPersistableDirty(this);
		}

		public void removeAuthority(String authority, int userId) {
		if (mAuths.remove(new PkgUser(authority, userId)) != null) {
		mTracker.onPersistableDirty(this);
		}
		}

		public synchronized boolean hasPermission(Uri uri, int userId) {
		if (!Objects.equals(ContentResolver.SCHEME_CONTENT, uri.getScheme())) return false;
		SliceAuthority authority = getAuthority(new PkgUser(uri.getAuthority(), userId));
		return authority != null && authority.hasPermission(uri.getPathSegments());
		}

		public void grantUri(Uri uri, PkgUser providerPkg) {
		SliceAuthority authority = getOrCreateAuthority(
		new PkgUser(uri.getAuthority(), providerPkg.getUserId()),
		providerPkg);
		authority.addPath(uri.getPathSegments());
		}

		public void revokeUri(Uri uri, PkgUser providerPkg) {
		SliceAuthority authority = getOrCreateAuthority(
		new PkgUser(uri.getAuthority(), providerPkg.getUserId()),
		providerPkg);
		authority.removePath(uri.getPathSegments());
		}

		public void clear() {
		if (!mHasFullAccess && mAuths.isEmpty()) return;
		mHasFullAccess = false;
		mAuths.clear();
		onPersistableDirty(this);
		}

		@Override
		public void onPersistableDirty(Persistable obj) {
		mTracker.onPersistableDirty(this);
		}

		@Override
		public String getFileName() {
		return getFileName(mPkg);
		}

		public synchronized void writeTo(XmlSerializer out) throws IOException {
		out.startTag(NAMESPACE, TAG_CLIENT);
		out.attribute(NAMESPACE, ATTR_PKG, mPkg.toString());
		out.attribute(NAMESPACE, ATTR_FULL_ACCESS, mHasFullAccess ? "1" : "0");

		final int N = mAuths.size();
		for (int i = 0; i < N; i++) {
		out.startTag(NAMESPACE, TAG_AUTHORITY);
		out.attribute(NAMESPACE, ATTR_AUTHORITY, mAuths.valueAt(i).mAuthority);
		out.attribute(NAMESPACE, ATTR_PKG, mAuths.valueAt(i).mPkg.toString());

		mAuths.valueAt(i).writeTo(out);

		out.endTag(NAMESPACE, TAG_AUTHORITY);
		}

		out.endTag(NAMESPACE, TAG_CLIENT);
		}

		public static SliceClientPermissions createFrom(XmlPullParser parser, DirtyTracker tracker)
		throws XmlPullParserException, IOException {
		// Get to the beginning of the provider.
		while (parser.getEventType() != XmlPullParser.START_TAG
		\|\| !TAG_CLIENT.equals(parser.getName())) {
		parser.next();
		}
		int depth = parser.getDepth();
		PkgUser pkgUser = new PkgUser(parser.getAttributeValue(NAMESPACE, ATTR_PKG));
		SliceClientPermissions provider = new SliceClientPermissions(pkgUser, tracker);
		String fullAccess = parser.getAttributeValue(NAMESPACE, ATTR_FULL_ACCESS);
		if (fullAccess == null) {
		fullAccess = "0";
		}
		provider.mHasFullAccess = Integer.parseInt(fullAccess) != 0;
		parser.next();

		while (parser.getDepth() > depth) {
		if (parser.getEventType() == XmlPullParser.START_TAG
		&& TAG_AUTHORITY.equals(parser.getName())) {
		try {
		PkgUser pkg = new PkgUser(parser.getAttributeValue(NAMESPACE, ATTR_PKG));
		SliceAuthority authority = new SliceAuthority(
		parser.getAttributeValue(NAMESPACE, ATTR_AUTHORITY), pkg, provider);
		authority.readFrom(parser);
		provider.mAuths.put(new PkgUser(authority.getAuthority(), pkg.getUserId()),
		authority);
		} catch (IllegalArgumentException e) {
		Slog.e(TAG, "Couldn't read PkgUser", e);
		}
		}

		parser.next();
		}
		return provider;
		}

		public static String getFileName(PkgUser pkg) {
		return String.format("client_%s", pkg.toString());
		}

		public static class SliceAuthority implements Persistable {
		public static final String DELIMITER = "/";
		private final String mAuthority;
		private final DirtyTracker mTracker;
		private final PkgUser mPkg;
		private final ArraySet<String[]> mPaths = new ArraySet<>();

		public SliceAuthority(String authority, PkgUser pkg, DirtyTracker tracker) {
		mAuthority = authority;
		mPkg = pkg;
		mTracker = tracker;
		}

		public String getAuthority() {
		return mAuthority;
		}

		public PkgUser getPkg() {
		return mPkg;
		}

		void addPath(List<String> path) {
		String[] pathSegs = path.toArray(new String[path.size()]);
		for (int i = mPaths.size() - 1; i >= 0; i--) {
		String[] existing = mPaths.valueAt(i);
		if (isPathPrefixMatch(existing, pathSegs)) {
		// Nothing to add here.
		return;
		}
		if (isPathPrefixMatch(pathSegs, existing)) {
		mPaths.removeAt(i);
		}
		}
		mPaths.add(pathSegs);
		mTracker.onPersistableDirty(this);
		}

		void removePath(List<String> path) {
		boolean changed = false;
		String[] pathSegs = path.toArray(new String[path.size()]);
		for (int i = mPaths.size() - 1; i >= 0; i--) {
		String[] existing = mPaths.valueAt(i);
		if (isPathPrefixMatch(pathSegs, existing)) {
		changed = true;
		mPaths.removeAt(i);
		}
		}
		if (changed) {
		mTracker.onPersistableDirty(this);
		}
		}

		public synchronized Collection<String[]> getPaths() {
		return new ArraySet<>(mPaths);
		}

		public boolean hasPermission(List<String> path) {
		for (String[] p : mPaths) {
		if (isPathPrefixMatch(p, path.toArray(new String[path.size()]))) {
		return true;
		}
		}
		return false;
		}

		private boolean isPathPrefixMatch(String[] prefix, String[] path) {
		final int prefixSize = prefix.length;
		if (path.length < prefixSize) return false;

		for (int i = 0; i < prefixSize; i++) {
		if (!Objects.equals(path[i], prefix[i])) {
		return false;
		}
		}

		return true;
		}

		@Override
		public String getFileName() {
		return null;
		}

		public synchronized void writeTo(XmlSerializer out) throws IOException {
		final int N = mPaths.size();
		for (int i = 0; i < N; i++) {
		out.startTag(NAMESPACE, TAG_PATH);
		out.text(encodeSegments(mPaths.valueAt(i)));
		out.endTag(NAMESPACE, TAG_PATH);
		}
		}

		public synchronized void readFrom(XmlPullParser parser)
		throws IOException, XmlPullParserException {
		parser.next();
		int depth = parser.getDepth();
		while (parser.getDepth() >= depth) {
		if (parser.getEventType() == XmlPullParser.START_TAG
		&& TAG_PATH.equals(parser.getName())) {
		mPaths.add(decodeSegments(parser.nextText()));
		}
		parser.next();
		}
		}

		private String encodeSegments(String[] s) {
		String[] out = new String[s.length];
		for (int i = 0; i < s.length; i++) {
		out[i] = Uri.encode(s[i]);
		}
		return TextUtils.join(DELIMITER, out);
		}

		private String[] decodeSegments(String s) {
		String[] sets = s.split(DELIMITER, -1);
		for (int i = 0; i < sets.length; i++) {
		sets[i] = Uri.decode(sets[i]);
		}
		return sets;
		}

		/**
		* Only for testing, no deep equality of these are done normally.
		*/
		@Override
		public boolean equals(Object obj) {
		if (!getClass().equals(obj != null ? obj.getClass() : null)) return false;
		SliceAuthority other = (SliceAuthority) obj;
		if (mPaths.size() != other.mPaths.size()) return false;
		ArrayList<String[]> p1 = new ArrayList<>(mPaths);
		ArrayList<String[]> p2 = new ArrayList<>(other.mPaths);
		p1.sort(Comparator.comparing(o -> TextUtils.join(",", o)));
		p2.sort(Comparator.comparing(o -> TextUtils.join(",", o)));
		for (int i = 0; i < p1.size(); i++) {
		String[] a1 = p1.get(i);
		String[] a2 = p2.get(i);
		if (a1.length != a2.length) return false;
		for (int j = 0; j < a1.length; j++) {
		if (!Objects.equals(a1[j], a2[j])) return false;
		}
		}
		return Objects.equals(mAuthority, other.mAuthority)
		&& Objects.equals(mPkg, other.mPkg);
		}

		@Override
		public String toString() {
		return String.format("(%s, %s: %s)", mAuthority, mPkg.toString(), pathToString(mPaths));
		}

		private String pathToString(ArraySet<String[]> paths) {
		return TextUtils.join(", ", paths.stream().map(s -> TextUtils.join("/", s))
		.collect(Collectors.toList()));
		}
		}
		}

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

+92 −133

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