/*
 * Copyright 2011 the original author or authors.
 * 
 * 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 org.codenarc.rule.security

import org.codehaus.groovy.ast.expr.MethodCallExpression
import org.codenarc.rule.AbstractAstVisitorRule
import org.codenarc.rule.AbstractMethodCallExpressionVisitor
import org.codenarc.util.AstUtil

/**
 * Web applications should never call System.exit(). A call to System.exit() is probably part of leftover debug code or code imported from a non-J2EE application.
 *
 * @author 'Hamlet D'Arcy'
  */
class SystemExitRule extends AbstractAstVisitorRule {
    String name = 'SystemExit'
    int priority = 2
    Class astVisitorClass = SystemExitAstVisitor
}

class SystemExitAstVisitor extends AbstractMethodCallExpressionVisitor {

    @Override
    void visitMethodCallExpression(MethodCallExpression call) {

        if (AstUtil.isMethodCall(call, 'System', 'exit', 1)) {
            addViolation(call, 'Calling System.exit() is insecure and can expose a denial of service attack')
        }
    }
}
