net.cloudopt.next.waf.injection.XSSInjection.kt Maven / Gradle / Ivy
/*
* Copyright 2017-2021 Cloudopt
*
* 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
*
* https://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 net.cloudopt.next.waf.injection
import java.util.regex.Pattern
class XSSInjection : Filter {
/**
* @param value Pending content
* @return
* @Description Peel dangerous content
*/
override fun filter(value: String): String {
var s = value
// Avoid null characters
s = value.replace("".toRegex(), "")
// Avoid anything between script tags
var scriptPattern = Pattern.compile("", Pattern.CASE_INSENSITIVE)
s = scriptPattern.matcher(s).replaceAll("")
// Avoid anything in a src='...' type of expression
scriptPattern = Pattern.compile(
"src[\r\n]*=[\r\n]*\\\'(.*?)\\\'", Pattern.CASE_INSENSITIVE
or Pattern.MULTILINE or Pattern.DOTALL
)
s = scriptPattern.matcher(s).replaceAll("")
scriptPattern = Pattern.compile(
"src[\r\n]*=[\r\n]*\\\"(.*?)\\\"", Pattern.CASE_INSENSITIVE
or Pattern.MULTILINE or Pattern.DOTALL
)
s = scriptPattern.matcher(s).replaceAll("")
// Remove any lonesome tag
scriptPattern = Pattern.compile("", Pattern.CASE_INSENSITIVE)
s = scriptPattern.matcher(s).replaceAll("")
// Remove any lonesome