com.h3xstream.findsecbugs.crypto.DesUsageDetector Maven / Gradle / Ivy

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Core module of the project. It include all the FindBugs detectors. The resulting jar is the published plugin.

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/**
 * Find Security Bugs
 * Copyright (c) 2013, Philippe Arteau, All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3.0 of the License, or (at your option) any later version.
 *
 * 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.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library.
 */
package com.h3xstream.findsecbugs.crypto;

import com.h3xstream.findsecbugs.common.StringTracer;
import edu.umd.cs.findbugs.BugInstance;
import edu.umd.cs.findbugs.BugReporter;
import edu.umd.cs.findbugs.OpcodeStack;
import edu.umd.cs.findbugs.Priorities;
import edu.umd.cs.findbugs.bcel.OpcodeStackDetector;
import org.apache.bcel.Constants;

/**
 *
 * Cipher identify
 *
 * 
 *     DES/CBC/NoPadding (56 bit)
 *     
DES/CBC/PKCS5Padding (56 bit)
 *     
DES/ECB/NoPadding (56 bit)
 *     
DES/ECB/PKCS5Padding (56 bit)
 *     
DESede/CBC/NoPadding (168 bit)
 *     
DESede/CBC/PKCS5Padding (168 bit)
 *     
DESede/ECB/NoPadding (168 bit)
 *     
DESede/ECB/PKCS5Padding (168 bit)
 * 
 * Ref: Partial list of ciphers
 */
public class DesUsageDetector  extends OpcodeStackDetector {

    private static final boolean DEBUG = false;
    private static final String DES_USAGE_TYPE = "DES_USAGE";

    private BugReporter bugReporter;

    public DesUsageDetector(BugReporter bugReporter) {
        this.bugReporter = bugReporter;
    }

    @Override
    public void sawOpcode(int seen) {
        if (seen == Constants.INVOKESTATIC && getClassConstantOperand().equals("javax/crypto/Cipher") &&
                getNameConstantOperand().equals("getInstance")) {
            OpcodeStack.Item item = stack.getStackItem( stack.getStackDepth()-1 ); //The first argument is last
            if ( StringTracer.isConstantString(item)) {
                String cipherValue = (String) item.getConstant();
                if(DEBUG) System.out.println(cipherValue);

                if(cipherValue.startsWith( "DES/" ) || cipherValue.startsWith( "DESede/" )) {
                    bugReporter.reportBug(new BugInstance(this, DES_USAGE_TYPE, Priorities.NORMAL_PRIORITY) //
                            .addClass( this ).addMethod( this ).addSourceLine(this));
                }
            }
        }
    }
}