SELinux.java

/*
 * This file is part of Fim - File Integrity Manager
 *
 * Copyright (C) 2017  Etienne Vrignaud
 *
 * Fim is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Fim is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Fim.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.fim.util;

import org.apache.commons.lang3.SystemUtils;
import org.fim.model.Context;

import java.nio.file.Path;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;

public class SELinux {
    public static final boolean ENABLED = isEnabled();

    /**
     * Check whether SELinux is enabled or not.
     */
    private static boolean isEnabled() {
        if (SystemUtils.IS_OS_WINDOWS) {
            return false;
        }

        try {
            List<String> lines = CommandUtil.executeCommandAndGetLines(Collections.singletonList("sestatus"));
            for (String line : lines) {
                if (line.contains("SELinux status")) {
                    if (line.contains("enabled")) {
                        Logger.info("SELinux is enabled on this system");
                        return true;
                    }

                    return false;
                }
            }
        } catch (Exception ex) {
            // Never mind
        }
        return false;
    }

    /**
     * Retrieve the SELinux label of the specified file.
     */
    public static String getLabel(Context context, Path file) {
        String fileName = file.normalize().toAbsolutePath().toString();
        try {
            String line = CommandUtil.executeCommand(Arrays.asList("ls", "-1Z", fileName));
            String[] strings = line.split(" ");
            if (strings.length == 2) {
                return strings[0];
            }
        } catch (Exception ex) {
            Logger.error("Error retrieving SELinux label for '" + file + "'", ex, context.isDisplayStackTrace());
        }

        return null;
    }

    /**
     * Set the SELinux label of the specified file.
     */
    public static void setLabel(Context context, Path file, String label) {
        String fileName = file.normalize().toAbsolutePath().toString();
        try {
            CommandUtil.executeCommand(Arrays.asList("chcon", label, fileName));
        } catch (Exception ex) {
            Logger.error("Error setting SELinux label for '" + file + "'", ex, context.isDisplayStackTrace());
        }
    }
}