com.nesscomputing.syslog4j.impl.message.modifier.mac.MacSyslogMessageModifier Maven / Gradle / Ivy

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Syslog4j provides client and server implementations of the BSD Syslog protocol (RFC 3164) and the structured syslog" protocol (RFC5424).
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/**
 *
 * (C) Copyright 2008-2011 syslog4j.org
 *
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Lesser General Public License
 * (LGPL) version 2.1 which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/lgpl-2.1.html
 *
 * This library 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
 * Lesser General Public License for more details.
 */
package com.nesscomputing.syslog4j.impl.message.modifier.mac;

import java.security.InvalidKeyException;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;

import javax.crypto.Mac;

import com.nesscomputing.syslog4j.SyslogFacility;
import com.nesscomputing.syslog4j.SyslogIF;
import com.nesscomputing.syslog4j.SyslogLevel;
import com.nesscomputing.syslog4j.SyslogRuntimeException;
import com.nesscomputing.syslog4j.impl.message.modifier.AbstractSyslogMessageModifier;
import com.nesscomputing.syslog4j.util.Base64;
import com.nesscomputing.syslog4j.util.SyslogUtility;

/**
* MacSyslogMessageModifier is an implementation of SyslogMessageModifierIF
* that provides support for Java Cryptographic signed hashes (HmacSHA1, etc.)
*
* Syslog4j is licensed under the Lesser GNU Public License v2.1.  A copy
* of the LGPL license is available in the META-INF folder in all
* distributions of Syslog4j and in the base directory of the "doc" ZIP.
*
* @author <[email protected]>
* @version $Id: MacSyslogMessageModifier.java,v 1.5 2010/10/28 05:10:57 cvs Exp $
*/
public class MacSyslogMessageModifier extends AbstractSyslogMessageModifier {
    protected MacSyslogMessageModifierConfig config = null;

    protected Mac mac = null;

    public MacSyslogMessageModifier(MacSyslogMessageModifierConfig config) throws SyslogRuntimeException {
        super(config);

        this.config = config;

        try {
            this.mac = Mac.getInstance(config.getMacAlgorithm());
            this.mac.init(config.getKey());

        } catch (NoSuchAlgorithmException nsae) {
            throw new SyslogRuntimeException(nsae);

        } catch (InvalidKeyException ike) {
            throw new SyslogRuntimeException(ike);
        }
    }

    public static MacSyslogMessageModifier createHmacSHA1(Key key) {
        return new MacSyslogMessageModifier(MacSyslogMessageModifierConfig.createHmacSHA1(key));
    }

    public static MacSyslogMessageModifier createHmacSHA1(String base64Key) {
        return new MacSyslogMessageModifier(MacSyslogMessageModifierConfig.createHmacSHA1(base64Key));
    }

    public static MacSyslogMessageModifier createHmacSHA256(Key key) {
        return new MacSyslogMessageModifier(MacSyslogMessageModifierConfig.createHmacSHA256(key));
    }

    public static MacSyslogMessageModifier createHmacSHA256(String base64Key) {
        return new MacSyslogMessageModifier(MacSyslogMessageModifierConfig.createHmacSHA256(base64Key));
    }

    public static MacSyslogMessageModifier createHmacSHA512(Key key) {
        return new MacSyslogMessageModifier(MacSyslogMessageModifierConfig.createHmacSHA512(key));
    }

    public static MacSyslogMessageModifier createHmacSHA512(String base64Key) {
        return new MacSyslogMessageModifier(MacSyslogMessageModifierConfig.createHmacSHA512(base64Key));
    }

    public static MacSyslogMessageModifier createHmacMD5(Key key) {
        return new MacSyslogMessageModifier(MacSyslogMessageModifierConfig.createHmacMD5(key));
    }

    public static MacSyslogMessageModifier createHmacMD5(String base64Key) {
        return new MacSyslogMessageModifier(MacSyslogMessageModifierConfig.createHmacMD5(base64Key));
    }

    public MacSyslogMessageModifierConfig getConfig() {
        return this.config;
    }

    @Override
    public String modify(SyslogIF syslog, SyslogFacility facility, SyslogLevel level, String message) {
        synchronized(this.mac) {
            byte[] messageBytes = SyslogUtility.getBytes(syslog.getConfig(),message);

            StringBuffer buffer = new StringBuffer(message);

            byte[] macBytes = this.mac.doFinal(messageBytes);

            String macString = Base64.encodeBytes(macBytes,Base64.DONT_BREAK_LINES);

            buffer.append(this.config.getPrefix());
            buffer.append(macString);
            buffer.append(this.config.getSuffix());

            return buffer.toString();
        }
    }

    public boolean verify(String message, String base64Signature) {
        byte[] signature = Base64.decode(base64Signature);

        return verify(message,signature);
    }

    public boolean verify(String message, byte[] signature) {
        synchronized(this.mac) {
            byte[] messageBytes = SyslogUtility.getBytes(this.config,message);

            byte[] macBytes = this.mac.doFinal(messageBytes);

            return Arrays.equals(macBytes,signature);
        }
    }
}