跨站点脚本攻击

跨站点脚本攻击的过滤

pom.xml 添加：

org.owasp.antisamy

antisamy

1.4.4

web.xml添加过滤：

AntiSamyFilter

com.c2bcms.app.filter.AntiSamyFilter

excludedPages

/resources

AntiSamyFilter

/*

com.c2bcms.app.filter.AntiSamyFilter文件地址：

package com.c2bcms.app.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 com.c2bcms.app.components.safety.AntiSamyHttpServletRequestWrapper;

public class AntiSamyFilter implements Filter {

FilterConfig filterConfig = null;

public void init(FilterConfig filterConfig) throws ServletException {

this.filterConfig = filterConfig;

}

public void destroy() {

this.filterConfig = null;

}

@Override

public void doFilter(ServletRequest req, ServletResponse res,

FilterChain chain) throws IOException, ServletException {

// TODO Auto-generated method stub

HttpServletRequest request = (HttpServletRequest) req;

String requestUri = request.getRequestURI();

AntiSamyHttpServletRequestWrapper requestW = new AntiSamyHttpServletRequestWrapper(request);

chain.doFilter(requestW, res);

}

}

AntiSamyHttpServletRequestWrapper 调用文件：

package com.c2bcms.app.components.safety;

import java.io.UnsupportedEncodingException;

import java.util.Iterator;

import java.util.Map;

import javax.servlet.http.HttpServletRequest;

import javax.servlet.http.HttpServletRequestWrapper;

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;

public class AntiSamyHttpServletRequestWrapper extends HttpServletRequestWrapper {

private static Policy policy = null;

static{

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

String path =AntiSamyHttpServletRequestWrapper.class.getClassLoader().getResource("antisamy.xml").getFile();

try {

path = java.net.URLDecoder.decode(path ,"UTF-8");

} catch (UnsupportedEncodingException e1) {

e1.printStackTrace();

}

System.out.println(path);

if(path.startsWith("file")){

path = path.substring(6);

}

try {

// policy = Policy.getInstance(ClassLoader.getSystemResourceAsStream("antisamy.xml"));

policy = Policy.getInstance(path);

} catch (PolicyException e) {

e.printStackTrace();

}

}

public AntiSamyHttpServletRequestWrapper(HttpServletRequest request) {

super(request);

}

@SuppressWarnings("rawtypes")

public Map getParameterMap(){

Map request_map = super.getParameterMap();

Iterator iterator = request_map.entrySet().iterator();

System.out.println("request_map"+request_map.size());

while(iterator.hasNext()){

Map.Entry me = (Map.Entry)iterator.next();

//System.out.println(me.getKey()+":");

String[] values = (String[])me.getValue();

for(int i = 0 ; i < values.length ; i++){

System.out.println(values[i]);

values[i] = xssClean(values[i]);

}

}

return request_map;

}

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;

}

public String getParameter(String paramString)

{

String str = super.getParameter(paramString);

if (str == null)

return null;

return xssClean(str);

}

public String getHeader(String paramString)

{

String str = super.getHeader(paramString);

if (str == null)

return null;

return xssClean(str);

}

private String xssClean(String value) {

AntiSamy antiSamy = new AntiSamy();

try {

//CleanResults cr = antiSamy.scan(dirtyInput, policyFilePath);

//String str = StringEscapeUtils.unescapeHtml(value);

//value = java.net.URLDecoder.decode(value);

final CleanResults cr = antiSamy.scan(value, policy);

//安全的HTML输出

return cr.getCleanHTML();

} catch (ScanException e) {

e.printStackTrace();

} catch (PolicyException e) {

e.printStackTrace();

}

return value;

}

}

然后添加antisamy.xml文件