XSS攻击听说过，没见过，后来通过查资料了解一点，这篇文章中，主要是针对XSS攻击做一个基本的防御，我也不知道能不能防的住，防不住在加规则，中国式解决问题：哪疼医那。哈哈
由于公司用的是 SpringMVC，因此，这次就主要基于 SpringMVC 来解决这些漏洞。当然，其实这些解决方案都是大同小异，对于什么环境来说根本无所谓。了解了原理，什么环境、什么语言都可以运用自如了。废话就不多说了，直接上解决方案。1、在web.xml加一个filter
<!-- xss -->
<filter>
<filter-name>XssSqlFilter</filter-name>
<filter-class>com.foriseland.fsoa.pay.filter.XssFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>XssSqlFilter</filter-name>
<url-pattern>/*</url-pattern>
<dispatcher>REQUEST</dispatcher>
</filter-mapping>2、过滤器 XssFilter，现servlet的Filter接口
package com.foriseland.fsoa.pay.filter;
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
import javax.servlet.http.HttpServletRequest;
/**
* @describe xss过滤器
* @createTime 2018年3月24日 下午3:19:11
*/
public class XssFilter implements Filter{
FilterConfig filterConfig = null;
@Override
public void init(FilterConfig filterConfig) throws ServletException {
this.filterConfig = filterConfig;
}
@Override
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
chain.doFilter(new XssHttpServletRequestWrapper((HttpServletRequest) request), response);
}
@Override
public void destroy() {
this.filterConfig = null;
}
}
3、关键是XssHttpServletRequestWrapper的实现方式，继承servlet的HttpServletRequestWrapper，并重写相应的几个有可能带xss攻击的方法
package com.foriseland.fsoa.pay.filter;
import java.util.regex.Pattern;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
/**
* @describe 使用 Filter 来过滤浏览器发出的请求，对每个 post 请求的参数过滤一些关键字
* @createTime 2018年3月24日 下午3:19:26
*/
public class XssHttpServletRequestWrapper extends HttpServletRequestWrapper{
public XssHttpServletRequestWrapper(HttpServletRequest servletRequest) {
super(servletRequest);
}
public String[] getParameterValues(String parameter) {
String[] values = super.getParameterValues(parameter);
if (values==null) {
return null;
}
int count = values.length;
String[] encodedValues = new String[count];
for (int i = 0; i < count; i++) {
encodedValues[i] = stripXSS(values[i]);
}
return encodedValues;
}
public String getParameter(String parameter) {
String value = super.getParameter(parameter);
if (value == null) {
return null;
}
return stripXSS(value);
}
public String getHeader(String name) {
String value = super.getHeader(name);
if (value == null)
return null;
return stripXSS(value);
}
/**
* @describe 使用替换策略，换成安全的，例如：< > ' " \ / # & 。
* @author lc
* @returnType String
* @createTime 2018年3月24日 下午3:28:35
*/
private String cleanXSS(String value) {
value = value.replaceAll("<", "& lt;").replaceAll(">", "& gt;");
value = value.replaceAll("\\(", "& #40;").replaceAll("\\)", "& #41;");
value = value.replaceAll("'", "& #39;");
value = value.replaceAll("eval\\((.*)\\)", "");
value = value.replaceAll("[\\\"\\\'][\\s]*javascript:(.*)[\\\"\\\']", "\"\"");
value = value.replaceAll("script", "");
return value;
}
/**
* @describe 采用 ESAPI library 来防止XSS攻击
* @author lc
* @returnType String
* @createTime 2018年3月24日 下午3:29:01
*/
private String stripXSS(String value) {
if (value != null) {
// NOTE: It's highly recommended to use the ESAPI library and uncomment the following line to
// avoid encoded attacks.
// value = ESAPI.encoder().canonicalize(value);
// Avoid null characters
value = value.replaceAll("", "");
// Avoid anything between script tags
Pattern scriptPattern = Pattern.compile("<script>(.*?)</script>", Pattern.CASE_INSENSITIVE);
value = scriptPattern.matcher(value).replaceAll("");
// Avoid anything in a src="http://www.yihaomen.com/article/java/..." type of expression
scriptPattern = Pattern.compile("src[\r\n]*=[\r\n]*\\\'(.*?)\\\'", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
value = scriptPattern.matcher(value).replaceAll("");
scriptPattern = Pattern.compile("src[\r\n]*=[\r\n]*\\\"(.*?)\\\"", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
value = scriptPattern.matcher(value).replaceAll("");
// Remove any lonesome </script> tag
scriptPattern = Pattern.compile("</script>", Pattern.CASE_INSENSITIVE);
value = scriptPattern.matcher(value).replaceAll("");
// Remove any lonesome <script ...> tag
scriptPattern = Pattern.compile("<script(.*?)>", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
value = scriptPattern.matcher(value).replaceAll("");
// Avoid eval(...) expressions
scriptPattern = Pattern.compile("eval\\((.*?)\\)", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
value = scriptPattern.matcher(value).replaceAll("");
// Avoid expression(...) expressions
scriptPattern = Pattern.compile("expression\\((.*?)\\)", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
value = scriptPattern.matcher(value).replaceAll("");
// Avoid javascript:... expressions
scriptPattern = Pattern.compile("javascript:", Pattern.CASE_INSENSITIVE);
value = scriptPattern.matcher(value).replaceAll("");
// Avoid vbscript:... expressions
scriptPattern = Pattern.compile("vbscript:", Pattern.CASE_INSENSITIVE);
value = scriptPattern.matcher(value).replaceAll("");
// Avoid οnlοad= expressions
scriptPattern = Pattern.compile("onload(.*?)=", Pattern.CASE_INSENSITIVE | Pattern.MULTILINE | Pattern.DOTALL);
value = scriptPattern.matcher(value).replaceAll("");
}
return value;
}
}