| /* |
| * Copyright (C) 2014 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; |
| |
| import static com.android.internal.util.ArrayUtils.appendInt; |
| |
| import android.app.ActivityManager; |
| import android.content.ComponentName; |
| import android.content.pm.FeatureInfo; |
| import android.content.pm.PackageManager; |
| import android.os.Environment; |
| import android.os.Process; |
| import android.os.storage.StorageManager; |
| import android.util.ArrayMap; |
| import android.util.ArraySet; |
| import android.util.Slog; |
| import android.util.SparseArray; |
| import android.util.Xml; |
| |
| import com.android.internal.util.XmlUtils; |
| |
| import libcore.io.IoUtils; |
| |
| import org.xmlpull.v1.XmlPullParser; |
| import org.xmlpull.v1.XmlPullParserException; |
| |
| import java.io.File; |
| import java.io.FileNotFoundException; |
| import java.io.FileReader; |
| import java.io.IOException; |
| |
| /** |
| * Loads global system configuration info. |
| */ |
| public class SystemConfig { |
| static final String TAG = "SystemConfig"; |
| |
| static SystemConfig sInstance; |
| |
| // permission flag, determines which types of configuration are allowed to be read |
| private static final int ALLOW_FEATURES = 0x01; |
| private static final int ALLOW_LIBS = 0x02; |
| private static final int ALLOW_PERMISSIONS = 0x04; |
| private static final int ALLOW_APP_CONFIGS = 0x08; |
| private static final int ALLOW_ALL = ~0; |
| |
| // Group-ids that are given to all packages as read from etc/permissions/*.xml. |
| int[] mGlobalGids; |
| |
| // These are the built-in uid -> permission mappings that were read from the |
| // system configuration files. |
| final SparseArray<ArraySet<String>> mSystemPermissions = new SparseArray<>(); |
| |
| // These are the built-in shared libraries that were read from the |
| // system configuration files. Keys are the library names; strings are the |
| // paths to the libraries. |
| final ArrayMap<String, String> mSharedLibraries = new ArrayMap<>(); |
| |
| // These are the features this devices supports that were read from the |
| // system configuration files. |
| final ArrayMap<String, FeatureInfo> mAvailableFeatures = new ArrayMap<>(); |
| |
| // These are the features which this device doesn't support; the OEM |
| // partition uses these to opt-out of features from the system image. |
| final ArraySet<String> mUnavailableFeatures = new ArraySet<>(); |
| |
| public static final class PermissionEntry { |
| public final String name; |
| public int[] gids; |
| public boolean perUser; |
| |
| PermissionEntry(String name, boolean perUser) { |
| this.name = name; |
| this.perUser = perUser; |
| } |
| } |
| |
| // These are the permission -> gid mappings that were read from the |
| // system configuration files. |
| final ArrayMap<String, PermissionEntry> mPermissions = new ArrayMap<>(); |
| |
| // These are the packages that are white-listed to be able to run in the |
| // background while in power save mode (but not whitelisted from device idle modes), |
| // as read from the configuration files. |
| final ArraySet<String> mAllowInPowerSaveExceptIdle = new ArraySet<>(); |
| |
| // These are the packages that are white-listed to be able to run in the |
| // background while in power save mode, as read from the configuration files. |
| final ArraySet<String> mAllowInPowerSave = new ArraySet<>(); |
| |
| // These are the packages that are white-listed to be able to run in the |
| // background while in data-usage save mode, as read from the configuration files. |
| final ArraySet<String> mAllowInDataUsageSave = new ArraySet<>(); |
| |
| // These are the package names of apps which should be in the 'always' |
| // URL-handling state upon factory reset. |
| final ArraySet<String> mLinkedApps = new ArraySet<>(); |
| |
| // These are the packages that are whitelisted to be able to run as system user |
| final ArraySet<String> mSystemUserWhitelistedApps = new ArraySet<>(); |
| |
| // These are the packages that should not run under system user |
| final ArraySet<String> mSystemUserBlacklistedApps = new ArraySet<>(); |
| |
| // These are the components that are enabled by default as VR mode listener services. |
| final ArraySet<ComponentName> mDefaultVrComponents = new ArraySet<>(); |
| |
| // These are the permitted backup transport service components |
| final ArraySet<ComponentName> mBackupTransportWhitelist = new ArraySet<>(); |
| |
| public static SystemConfig getInstance() { |
| synchronized (SystemConfig.class) { |
| if (sInstance == null) { |
| sInstance = new SystemConfig(); |
| } |
| return sInstance; |
| } |
| } |
| |
| public int[] getGlobalGids() { |
| return mGlobalGids; |
| } |
| |
| public SparseArray<ArraySet<String>> getSystemPermissions() { |
| return mSystemPermissions; |
| } |
| |
| public ArrayMap<String, String> getSharedLibraries() { |
| return mSharedLibraries; |
| } |
| |
| public ArrayMap<String, FeatureInfo> getAvailableFeatures() { |
| return mAvailableFeatures; |
| } |
| |
| public ArrayMap<String, PermissionEntry> getPermissions() { |
| return mPermissions; |
| } |
| |
| public ArraySet<String> getAllowInPowerSaveExceptIdle() { |
| return mAllowInPowerSaveExceptIdle; |
| } |
| |
| public ArraySet<String> getAllowInPowerSave() { |
| return mAllowInPowerSave; |
| } |
| |
| public ArraySet<String> getAllowInDataUsageSave() { |
| return mAllowInDataUsageSave; |
| } |
| |
| public ArraySet<String> getLinkedApps() { |
| return mLinkedApps; |
| } |
| |
| public ArraySet<String> getSystemUserWhitelistedApps() { |
| return mSystemUserWhitelistedApps; |
| } |
| |
| public ArraySet<String> getSystemUserBlacklistedApps() { |
| return mSystemUserBlacklistedApps; |
| } |
| |
| public ArraySet<ComponentName> getDefaultVrComponents() { |
| return mDefaultVrComponents; |
| } |
| |
| public ArraySet<ComponentName> getBackupTransportWhitelist() { |
| return mBackupTransportWhitelist; |
| } |
| |
| SystemConfig() { |
| // Read configuration from system |
| readPermissions(Environment.buildPath( |
| Environment.getRootDirectory(), "etc", "sysconfig"), ALLOW_ALL); |
| // Read configuration from the old permissions dir |
| readPermissions(Environment.buildPath( |
| Environment.getRootDirectory(), "etc", "permissions"), ALLOW_ALL); |
| // Allow ODM to customize system configs around libs, features and apps |
| int odmPermissionFlag = ALLOW_LIBS | ALLOW_FEATURES | ALLOW_APP_CONFIGS; |
| readPermissions(Environment.buildPath( |
| Environment.getOdmDirectory(), "etc", "sysconfig"), odmPermissionFlag); |
| readPermissions(Environment.buildPath( |
| Environment.getOdmDirectory(), "etc", "permissions"), odmPermissionFlag); |
| // Only allow OEM to customize features |
| readPermissions(Environment.buildPath( |
| Environment.getOemDirectory(), "etc", "sysconfig"), ALLOW_FEATURES); |
| readPermissions(Environment.buildPath( |
| Environment.getOemDirectory(), "etc", "permissions"), ALLOW_FEATURES); |
| } |
| |
| void readPermissions(File libraryDir, int permissionFlag) { |
| // Read permissions from given directory. |
| if (!libraryDir.exists() || !libraryDir.isDirectory()) { |
| if (permissionFlag == ALLOW_ALL) { |
| Slog.w(TAG, "No directory " + libraryDir + ", skipping"); |
| } |
| return; |
| } |
| if (!libraryDir.canRead()) { |
| Slog.w(TAG, "Directory " + libraryDir + " cannot be read"); |
| return; |
| } |
| |
| // Iterate over the files in the directory and scan .xml files |
| File platformFile = null; |
| for (File f : libraryDir.listFiles()) { |
| // We'll read platform.xml last |
| if (f.getPath().endsWith("etc/permissions/platform.xml")) { |
| platformFile = f; |
| continue; |
| } |
| |
| if (!f.getPath().endsWith(".xml")) { |
| Slog.i(TAG, "Non-xml file " + f + " in " + libraryDir + " directory, ignoring"); |
| continue; |
| } |
| if (!f.canRead()) { |
| Slog.w(TAG, "Permissions library file " + f + " cannot be read"); |
| continue; |
| } |
| |
| readPermissionsFromXml(f, permissionFlag); |
| } |
| |
| // Read platform permissions last so it will take precedence |
| if (platformFile != null) { |
| readPermissionsFromXml(platformFile, permissionFlag); |
| } |
| } |
| |
| private void readPermissionsFromXml(File permFile, int permissionFlag) { |
| FileReader permReader = null; |
| try { |
| permReader = new FileReader(permFile); |
| } catch (FileNotFoundException e) { |
| Slog.w(TAG, "Couldn't find or open permissions file " + permFile); |
| return; |
| } |
| |
| final boolean lowRam = ActivityManager.isLowRamDeviceStatic(); |
| |
| try { |
| XmlPullParser parser = Xml.newPullParser(); |
| parser.setInput(permReader); |
| |
| int type; |
| while ((type=parser.next()) != parser.START_TAG |
| && type != parser.END_DOCUMENT) { |
| ; |
| } |
| |
| if (type != parser.START_TAG) { |
| throw new XmlPullParserException("No start tag found"); |
| } |
| |
| if (!parser.getName().equals("permissions") && !parser.getName().equals("config")) { |
| throw new XmlPullParserException("Unexpected start tag in " + permFile |
| + ": found " + parser.getName() + ", expected 'permissions' or 'config'"); |
| } |
| |
| boolean allowAll = permissionFlag == ALLOW_ALL; |
| boolean allowLibs = (permissionFlag & ALLOW_LIBS) != 0; |
| boolean allowFeatures = (permissionFlag & ALLOW_FEATURES) != 0; |
| boolean allowPermissions = (permissionFlag & ALLOW_PERMISSIONS) != 0; |
| boolean allowAppConfigs = (permissionFlag & ALLOW_APP_CONFIGS) != 0; |
| while (true) { |
| XmlUtils.nextElement(parser); |
| if (parser.getEventType() == XmlPullParser.END_DOCUMENT) { |
| break; |
| } |
| |
| String name = parser.getName(); |
| if ("group".equals(name) && allowAll) { |
| String gidStr = parser.getAttributeValue(null, "gid"); |
| if (gidStr != null) { |
| int gid = android.os.Process.getGidForName(gidStr); |
| mGlobalGids = appendInt(mGlobalGids, gid); |
| } else { |
| Slog.w(TAG, "<group> without gid in " + permFile + " at " |
| + parser.getPositionDescription()); |
| } |
| |
| XmlUtils.skipCurrentTag(parser); |
| continue; |
| } else if ("permission".equals(name) && allowPermissions) { |
| String perm = parser.getAttributeValue(null, "name"); |
| if (perm == null) { |
| Slog.w(TAG, "<permission> without name in " + permFile + " at " |
| + parser.getPositionDescription()); |
| XmlUtils.skipCurrentTag(parser); |
| continue; |
| } |
| perm = perm.intern(); |
| readPermission(parser, perm); |
| |
| } else if ("assign-permission".equals(name) && allowPermissions) { |
| String perm = parser.getAttributeValue(null, "name"); |
| if (perm == null) { |
| Slog.w(TAG, "<assign-permission> without name in " + permFile + " at " |
| + parser.getPositionDescription()); |
| XmlUtils.skipCurrentTag(parser); |
| continue; |
| } |
| String uidStr = parser.getAttributeValue(null, "uid"); |
| if (uidStr == null) { |
| Slog.w(TAG, "<assign-permission> without uid in " + permFile + " at " |
| + parser.getPositionDescription()); |
| XmlUtils.skipCurrentTag(parser); |
| continue; |
| } |
| int uid = Process.getUidForName(uidStr); |
| if (uid < 0) { |
| Slog.w(TAG, "<assign-permission> with unknown uid \"" |
| + uidStr + " in " + permFile + " at " |
| + parser.getPositionDescription()); |
| XmlUtils.skipCurrentTag(parser); |
| continue; |
| } |
| perm = perm.intern(); |
| ArraySet<String> perms = mSystemPermissions.get(uid); |
| if (perms == null) { |
| perms = new ArraySet<String>(); |
| mSystemPermissions.put(uid, perms); |
| } |
| perms.add(perm); |
| XmlUtils.skipCurrentTag(parser); |
| |
| } else if ("library".equals(name) && allowLibs) { |
| String lname = parser.getAttributeValue(null, "name"); |
| String lfile = parser.getAttributeValue(null, "file"); |
| if (lname == null) { |
| Slog.w(TAG, "<library> without name in " + permFile + " at " |
| + parser.getPositionDescription()); |
| } else if (lfile == null) { |
| Slog.w(TAG, "<library> without file in " + permFile + " at " |
| + parser.getPositionDescription()); |
| } else { |
| //Log.i(TAG, "Got library " + lname + " in " + lfile); |
| mSharedLibraries.put(lname, lfile); |
| } |
| XmlUtils.skipCurrentTag(parser); |
| continue; |
| |
| } else if ("feature".equals(name) && allowFeatures) { |
| String fname = parser.getAttributeValue(null, "name"); |
| int fversion = XmlUtils.readIntAttribute(parser, "version", 0); |
| boolean allowed; |
| if (!lowRam) { |
| allowed = true; |
| } else { |
| String notLowRam = parser.getAttributeValue(null, "notLowRam"); |
| allowed = !"true".equals(notLowRam); |
| } |
| if (fname == null) { |
| Slog.w(TAG, "<feature> without name in " + permFile + " at " |
| + parser.getPositionDescription()); |
| } else if (allowed) { |
| addFeature(fname, fversion); |
| } |
| XmlUtils.skipCurrentTag(parser); |
| continue; |
| |
| } else if ("unavailable-feature".equals(name) && allowFeatures) { |
| String fname = parser.getAttributeValue(null, "name"); |
| if (fname == null) { |
| Slog.w(TAG, "<unavailable-feature> without name in " + permFile + " at " |
| + parser.getPositionDescription()); |
| } else { |
| mUnavailableFeatures.add(fname); |
| } |
| XmlUtils.skipCurrentTag(parser); |
| continue; |
| |
| } else if ("allow-in-power-save-except-idle".equals(name) && allowAll) { |
| String pkgname = parser.getAttributeValue(null, "package"); |
| if (pkgname == null) { |
| Slog.w(TAG, "<allow-in-power-save-except-idle> without package in " |
| + permFile + " at " + parser.getPositionDescription()); |
| } else { |
| mAllowInPowerSaveExceptIdle.add(pkgname); |
| } |
| XmlUtils.skipCurrentTag(parser); |
| continue; |
| |
| } else if ("allow-in-power-save".equals(name) && allowAll) { |
| String pkgname = parser.getAttributeValue(null, "package"); |
| if (pkgname == null) { |
| Slog.w(TAG, "<allow-in-power-save> without package in " + permFile + " at " |
| + parser.getPositionDescription()); |
| } else { |
| mAllowInPowerSave.add(pkgname); |
| } |
| XmlUtils.skipCurrentTag(parser); |
| continue; |
| |
| } else if ("allow-in-data-usage-save".equals(name) && allowAll) { |
| String pkgname = parser.getAttributeValue(null, "package"); |
| if (pkgname == null) { |
| Slog.w(TAG, "<allow-in-data-usage-save> without package in " + permFile |
| + " at " + parser.getPositionDescription()); |
| } else { |
| mAllowInDataUsageSave.add(pkgname); |
| } |
| XmlUtils.skipCurrentTag(parser); |
| continue; |
| |
| } else if ("app-link".equals(name) && allowAppConfigs) { |
| String pkgname = parser.getAttributeValue(null, "package"); |
| if (pkgname == null) { |
| Slog.w(TAG, "<app-link> without package in " + permFile + " at " |
| + parser.getPositionDescription()); |
| } else { |
| mLinkedApps.add(pkgname); |
| } |
| XmlUtils.skipCurrentTag(parser); |
| } else if ("system-user-whitelisted-app".equals(name) && allowAppConfigs) { |
| String pkgname = parser.getAttributeValue(null, "package"); |
| if (pkgname == null) { |
| Slog.w(TAG, "<system-user-whitelisted-app> without package in " + permFile |
| + " at " + parser.getPositionDescription()); |
| } else { |
| mSystemUserWhitelistedApps.add(pkgname); |
| } |
| XmlUtils.skipCurrentTag(parser); |
| } else if ("system-user-blacklisted-app".equals(name) && allowAppConfigs) { |
| String pkgname = parser.getAttributeValue(null, "package"); |
| if (pkgname == null) { |
| Slog.w(TAG, "<system-user-blacklisted-app without package in " + permFile |
| + " at " + parser.getPositionDescription()); |
| } else { |
| mSystemUserBlacklistedApps.add(pkgname); |
| } |
| XmlUtils.skipCurrentTag(parser); |
| } else if ("default-enabled-vr-app".equals(name) && allowAppConfigs) { |
| String pkgname = parser.getAttributeValue(null, "package"); |
| String clsname = parser.getAttributeValue(null, "class"); |
| if (pkgname == null) { |
| Slog.w(TAG, "<default-enabled-vr-app without package in " + permFile |
| + " at " + parser.getPositionDescription()); |
| } else if (clsname == null) { |
| Slog.w(TAG, "<default-enabled-vr-app without class in " + permFile |
| + " at " + parser.getPositionDescription()); |
| } else { |
| mDefaultVrComponents.add(new ComponentName(pkgname, clsname)); |
| } |
| XmlUtils.skipCurrentTag(parser); |
| } else if ("backup-transport-whitelisted-service".equals(name) && allowFeatures) { |
| String serviceName = parser.getAttributeValue(null, "service"); |
| if (serviceName == null) { |
| Slog.w(TAG, "<backup-transport-whitelisted-service> without service in " |
| + permFile + " at " + parser.getPositionDescription()); |
| } else { |
| ComponentName cn = ComponentName.unflattenFromString(serviceName); |
| if (cn == null) { |
| Slog.w(TAG, |
| "<backup-transport-whitelisted-service> with invalid service name " |
| + serviceName + " in "+ permFile |
| + " at " + parser.getPositionDescription()); |
| } else { |
| mBackupTransportWhitelist.add(cn); |
| } |
| } |
| XmlUtils.skipCurrentTag(parser); |
| } else { |
| XmlUtils.skipCurrentTag(parser); |
| continue; |
| } |
| } |
| } catch (XmlPullParserException e) { |
| Slog.w(TAG, "Got exception parsing permissions.", e); |
| } catch (IOException e) { |
| Slog.w(TAG, "Got exception parsing permissions.", e); |
| } finally { |
| IoUtils.closeQuietly(permReader); |
| } |
| |
| // Some devices can be field-converted to FBE, so offer to splice in |
| // those features if not already defined by the static config |
| if (StorageManager.isFileEncryptedNativeOnly()) { |
| addFeature(PackageManager.FEATURE_FILE_BASED_ENCRYPTION, 0); |
| addFeature(PackageManager.FEATURE_SECURELY_REMOVES_USERS, 0); |
| } |
| |
| for (String featureName : mUnavailableFeatures) { |
| removeFeature(featureName); |
| } |
| } |
| |
| private void addFeature(String name, int version) { |
| FeatureInfo fi = mAvailableFeatures.get(name); |
| if (fi == null) { |
| fi = new FeatureInfo(); |
| fi.name = name; |
| fi.version = version; |
| mAvailableFeatures.put(name, fi); |
| } else { |
| fi.version = Math.max(fi.version, version); |
| } |
| } |
| |
| private void removeFeature(String name) { |
| if (mAvailableFeatures.remove(name) != null) { |
| Slog.d(TAG, "Removed unavailable feature " + name); |
| } |
| } |
| |
| void readPermission(XmlPullParser parser, String name) |
| throws IOException, XmlPullParserException { |
| if (mPermissions.containsKey(name)) { |
| throw new IllegalStateException("Duplicate permission definition for " + name); |
| } |
| |
| final boolean perUser = XmlUtils.readBooleanAttribute(parser, "perUser", false); |
| final PermissionEntry perm = new PermissionEntry(name, perUser); |
| mPermissions.put(name, perm); |
| |
| 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; |
| } |
| |
| String tagName = parser.getName(); |
| if ("group".equals(tagName)) { |
| String gidStr = parser.getAttributeValue(null, "gid"); |
| if (gidStr != null) { |
| int gid = Process.getGidForName(gidStr); |
| perm.gids = appendInt(perm.gids, gid); |
| } else { |
| Slog.w(TAG, "<group> without gid at " |
| + parser.getPositionDescription()); |
| } |
| } |
| XmlUtils.skipCurrentTag(parser); |
| } |
| } |
| } |
