xss （跨站脚本攻击）解决方案之 antisamy

来源：互联网发布：英语网络新兴词汇编辑：程序博客网时间：2024/06/05 18:14

问题原因：对网站用户提交的数据（请求数据）未做处理。

XXS原理分析参考：http://netsecurity.51cto.com/art/201408/448305_all.htm：点击打开链接

解决方案：引入开源antisamy框架

解决过程：

1.导入依赖

maven依赖：

<groupId>org.owasp.antisamy</groupId>

<artifactId>antisamy</artifactId>

</dependency>

</dependencies>

或者直接下载相关jar包。

2.自定义过滤器，对指定请求进行过滤，在web.xml中添加

package com.shopping.rsnet.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;

import org.apache.commons.lang.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

public class XssFilter implements Filter {
@SuppressWarnings("unused")
private FilterConfig filterConfig;
private String excludedUris;
private String[] excludedUriArr;
private Logger logger;

public XssFilter(){
/**日志*/
logger = LoggerFactory.getLogger(XssFilter.class);
}
/**
* Title: doFilter
* Description:执行过滤
* author:gelin
* create_date:2017-4-27
* update_date:
* @param request
* @param response
* @param chain
* @throws IOException
* @throws ServletException
*/
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
boolean excludedUri=false;
String uri=((HttpServletRequest)request).getRequestURI();
String contextPath=((HttpServletRequest)request).getContextPath();
String mappingURL=uri.replaceAll(contextPath, "");
for(int i=0;i<excludedUriArr.length;i++){
if(excludedUriArr[i].equals(mappingURL)){
excludedUri=true;
break;
}
}
if(excludedUri){
chain.doFilter(request,response);
}else{
if(logger.isDebugEnabled()){
logger.debug("过滤请求："+mappingURL);
}
chain.doFilter(new XssRequestWrapper((HttpServletRequest) request), response);
}
}
/**
* Title: init
* Description:初始化
* author:gelin
* create_date:2017-4-27
* update_date:
* @param filterConfig
* @throws ServletException
*/
public void init(FilterConfig filterConfig) throws ServletException {
this.filterConfig = filterConfig;
excludedUris=filterConfig.getInitParameter("excludedUris");
if(StringUtils.isNotEmpty(excludedUris)){
excludedUriArr=excludedUris.split(",");
}

}
public void destroy() {
this.filterConfig = null;
}

}

package com.shopping.rsnet.filter;

import java.io.UnsupportedEncodingException;
import java.net.URLDecoder;
import java.util.Iterator;
import java.util.Map;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;

import org.apache.commons.lang.StringEscapeUtils;
import org.owasp.validator.html.AntiSamy;
import org.owasp.validator.html.CleanResults;
import org.owasp.validator.html.Policy;
import org.owasp.validator.html.PolicyException;
import org.owasp.validator.html.ScanException;

/**
* Description: XXS防范
* author:gelingqin
* version:1.0
* CreateDateTime: 2017-4-26下午5:04:39
* UpdateTime:
* see:
*/
public class XssRequestWrapper extends HttpServletRequestWrapper {

private static Policy policy = null;

static{
//String path = URLUtility.getClassPath(XssRequestWrapper.class)+File.separator+"antisamy-anythinggoes-1.4.4.xml";
//antisamy-anythinggoes-1.4.4.xml

/**策略文件根据安全级别选择
* 参考：http://blog.csdn.net/softwave/article/details/53761796
*antisamy-slashdot.xml
*antisamy-ebay.xml
*antisamy-myspace.xml
*antisamy-anythinggoes.xml
*/
String path =XssRequestWrapper.class.getClassLoader().getResource("antisamy-anythinggoes-1.4.4.xml").getFile();
if(path.startsWith("file")){
path = path.substring(6);
}
try {
policy = Policy.getInstance(path);
} catch (PolicyException e) {
e.printStackTrace();
}
}

public XssRequestWrapper(HttpServletRequest request) {
super(request);
}

@SuppressWarnings("rawtypes")
@Override
public Map<String,String[]> getParameterMap(){
Map<String,String[]> request_map = super.getParameterMap();
Iterator iterator = request_map.entrySet().iterator();
while(iterator.hasNext()){
Map.Entry me = (Map.Entry)iterator.next();
String[] values = (String[])me.getValue();
for(int i = 0 ; i < values.length ; i++){
values[i] = xssClean(values[i]);
}
}
return request_map;
}
@Override
public String[] getParameterValues(String paramString) {
String[] arrayOfString1 = super.getParameterValues(paramString);
if (arrayOfString1 == null)
return null;
int i = arrayOfString1.length;
String[] arrayOfString2 = new String[i];
for (int j = 0; j < i; j++)
arrayOfString2[j] = xssClean(arrayOfString1[j]);
return arrayOfString2;
}
@Override
public String getParameter(String paramString) {
String str = super.getParameter(paramString);
if (str == null)
return null;
return xssClean(str);
}
@Override
public String getHeader(String paramString) {
String str = super.getHeader(paramString);
if (str == null)
return null;
return xssClean(str);
}
@Override
public String getQueryString() {
String str =super.getQueryString();
if (str == null)
return null;
return xssClean(str);
}


private String xssClean(String value) {
AntiSamy antiSamy = new AntiSamy();
try {
//按utf-8解碼:防止有害脚本例如1" onmouseover=s5mn(9186) bad=" encode %31%22%20%6F%6E%6D%6F%75%73%65%6F%76%65%72%3D%73%35%6D%6E%28%39%31%38%36%29%20%62%61%64%3D%22 骗过通行
try {
value=URLDecoder.decode(value, "utf-8");
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
final CleanResults cr = antiSamy.scan(value, policy);
//安全的HTML输出
String str=cr.getCleanHTML();
//不能反转义，反转义后就没效果了，转义的作用就是使脚本不被执行。
//str=StringEscapeUtils.unescapeHtml(str);
//链接不转义，否则无法调转
str=str.replaceAll("&", "&");
return str;
} catch (ScanException e) {
e.printStackTrace();
} catch (PolicyException e) {
e.printStackTrace();
}
return value;
}
}

策略文件需要下载：

antisamy-anythinggoes-1.4.4.xml

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xss （跨站脚本攻击） 解决方案之 antisamy

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