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/*
* 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.util.Slog;
import java.io.IOException;
import java.io.File;
import java.io.FileDescriptor;
/**
* 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/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;
/**
* Determine whether SELinux is disabled or enabled.
* @return a boolean indicating whether SELinux is enabled.
*/
public static final native boolean isSELinuxEnabled();
/**
* Determine whether SELinux is permissive or enforcing.
* @return a boolean indicating whether SELinux is enforcing.
*/
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.
*/
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);
/**
* Gets the security context of the current process.
* @return a String representing the security context of the current process.
*/
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.
*/
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.
*/
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.
*/
public static boolean restoreconRecursive(File file) {
try {
return native_restorecon(file.getCanonicalPath(), SELINUX_ANDROID_RESTORECON_RECURSE);
} catch (IOException e) {
Slog.e(TAG, "Error getting canonical path. Restorecon failed for " +
file.getPath(), e);
return false;
}
}
}
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