| /* |
| * Copyright (C) 2012 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 android.os; |
| |
| import android.annotation.UnsupportedAppUsage; |
| import android.util.Slog; |
| |
| import java.io.File; |
| import java.io.FileDescriptor; |
| import java.io.IOException; |
| |
| /** |
| * This class provides access to the centralized jni bindings for |
| * SELinux interaction. |
| * {@hide} |
| */ |
| public class SELinux { |
| private static final String TAG = "SELinux"; |
| |
| /** Keep in sync with ./external/selinux/libselinux/include/selinux/android.h */ |
| private static final int SELINUX_ANDROID_RESTORECON_NOCHANGE = 1; |
| private static final int SELINUX_ANDROID_RESTORECON_VERBOSE = 2; |
| private static final int SELINUX_ANDROID_RESTORECON_RECURSE = 4; |
| private static final int SELINUX_ANDROID_RESTORECON_FORCE = 8; |
| private static final int SELINUX_ANDROID_RESTORECON_DATADATA = 16; |
| private static final int SELINUX_ANDROID_RESTORECON_SKIPCE = 32; |
| private static final int SELINUX_ANDROID_RESTORECON_CROSS_FILESYSTEMS = 64; |
| private static final int SELINUX_ANDROID_RESTORECON_SKIP_SEHASH = 128; |
| |
| /** |
| * Determine whether SELinux is disabled or enabled. |
| * @return a boolean indicating whether SELinux is enabled. |
| */ |
| @UnsupportedAppUsage |
| public static final native boolean isSELinuxEnabled(); |
| |
| /** |
| * Determine whether SELinux is permissive or enforcing. |
| * @return a boolean indicating whether SELinux is enforcing. |
| */ |
| @UnsupportedAppUsage |
| public static final native boolean isSELinuxEnforced(); |
| |
| /** |
| * Sets the security context for newly created file objects. |
| * @param context a security context given as a String. |
| * @return a boolean indicating whether the operation succeeded. |
| */ |
| public static final native boolean setFSCreateContext(String context); |
| |
| /** |
| * Change the security context of an existing file object. |
| * @param path representing the path of file object to relabel. |
| * @param context new security context given as a String. |
| * @return a boolean indicating whether the operation succeeded. |
| */ |
| public static final native boolean setFileContext(String path, String context); |
| |
| /** |
| * Get the security context of a file object. |
| * @param path the pathname of the file object. |
| * @return a security context given as a String. |
| */ |
| @UnsupportedAppUsage |
| public static final native String getFileContext(String path); |
| |
| /** |
| * Get the security context of a peer socket. |
| * @param fd FileDescriptor class of the peer socket. |
| * @return a String representing the peer socket security context. |
| */ |
| public static final native String getPeerContext(FileDescriptor fd); |
| |
| /** |
| * Get the security context of a file descriptor of a file. |
| * @param fd FileDescriptor of a file. |
| * @return a String representing the file descriptor security context. |
| */ |
| public static final native String getFileContext(FileDescriptor fd); |
| |
| /** |
| * Gets the security context of the current process. |
| * @return a String representing the security context of the current process. |
| */ |
| @UnsupportedAppUsage |
| public static final native String getContext(); |
| |
| /** |
| * Gets the security context of a given process id. |
| * @param pid an int representing the process id to check. |
| * @return a String representing the security context of the given pid. |
| */ |
| @UnsupportedAppUsage |
| public static final native String getPidContext(int pid); |
| |
| /** |
| * Check permissions between two security contexts. |
| * @param scon The source or subject security context. |
| * @param tcon The target or object security context. |
| * @param tclass The object security class name. |
| * @param perm The permission name. |
| * @return a boolean indicating whether permission was granted. |
| */ |
| @UnsupportedAppUsage |
| public static final native boolean checkSELinuxAccess(String scon, String tcon, String tclass, String perm); |
| |
| /** |
| * Restores a file to its default SELinux security context. |
| * If the system is not compiled with SELinux, then {@code true} |
| * is automatically returned. |
| * If SELinux is compiled in, but disabled, then {@code true} is |
| * returned. |
| * |
| * @param pathname The pathname of the file to be relabeled. |
| * @return a boolean indicating whether the relabeling succeeded. |
| * @exception NullPointerException if the pathname is a null object. |
| */ |
| public static boolean restorecon(String pathname) throws NullPointerException { |
| if (pathname == null) { throw new NullPointerException(); } |
| return native_restorecon(pathname, 0); |
| } |
| |
| /** |
| * Restores a file to its default SELinux security context. |
| * If the system is not compiled with SELinux, then {@code true} |
| * is automatically returned. |
| * If SELinux is compiled in, but disabled, then {@code true} is |
| * returned. |
| * |
| * @param pathname The pathname of the file to be relabeled. |
| * @return a boolean indicating whether the relabeling succeeded. |
| */ |
| private static native boolean native_restorecon(String pathname, int flags); |
| |
| /** |
| * Restores a file to its default SELinux security context. |
| * If the system is not compiled with SELinux, then {@code true} |
| * is automatically returned. |
| * If SELinux is compiled in, but disabled, then {@code true} is |
| * returned. |
| * |
| * @param file The File object representing the path to be relabeled. |
| * @return a boolean indicating whether the relabeling succeeded. |
| * @exception NullPointerException if the file is a null object. |
| */ |
| public static boolean restorecon(File file) throws NullPointerException { |
| try { |
| return native_restorecon(file.getCanonicalPath(), 0); |
| } catch (IOException e) { |
| Slog.e(TAG, "Error getting canonical path. Restorecon failed for " + |
| file.getPath(), e); |
| return false; |
| } |
| } |
| |
| /** |
| * Recursively restores all files under the given path to their default |
| * SELinux security context. If the system is not compiled with SELinux, |
| * then {@code true} is automatically returned. If SELinux is compiled in, |
| * but disabled, then {@code true} is returned. |
| * |
| * @return a boolean indicating whether the relabeling succeeded. |
| */ |
| @UnsupportedAppUsage |
| public static boolean restoreconRecursive(File file) { |
| try { |
| return native_restorecon(file.getCanonicalPath(), |
| SELINUX_ANDROID_RESTORECON_RECURSE | SELINUX_ANDROID_RESTORECON_SKIP_SEHASH); |
| } catch (IOException e) { |
| Slog.e(TAG, "Error getting canonical path. Restorecon failed for " + |
| file.getPath(), e); |
| return false; |
| } |
| } |
| } |