下面的代码只支持struts2框架中的xss漏洞
第一步,创建过滤器XssFilter :
package com.ulic.ulcif.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.ulic.ulcif.requestwrapper.XssHttpServletRequestWrapper; /**
* XSS防跨站脚本攻击过滤器
*
*/
public class XssFilter implements Filter {
FilterConfig filterConfig = null;
/**
* Default constructor.
*/
public XssFilter() {
} public void destroy() {
this.filterConfig = null;
} public void init(FilterConfig fConfig) throws ServletException {
this.filterConfig = fConfig;
} public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {
chain.doFilter(new XssHttpServletRequestWrapper((HttpServletRequest) request), response);
} }
第二步,创建业务操作XssHttpServletRequestWrapper:
package com.ulic.ulcif.requestwrapper; import java.util.Enumeration;
import java.util.Map; import javax.servlet.http.HttpServletRequest; import org.apache.struts2.dispatcher.StrutsRequestWrapper;
import org.springframework.util.CollectionUtils; /**
* 写一个 Filter，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，替换成安全的，例如：< > ' " \ / # & 。
*
* 方法:实现一个自定义的 HttpServletRequestWrapper，然后在 Filter 里面调用它，替换掉 getParameter 函数即可
*/
public class XssHttpServletRequestWrapper extends StrutsRequestWrapper { HttpServletRequest orgRequest = null; public XssHttpServletRequestWrapper(HttpServletRequest servletRequest) {
super(servletRequest);
orgRequest = servletRequest;
} /**
* 重写getParameterValues方法
* 通过循环取出每一个请求结果
* 再对请求结果进行过滤
* */
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] = cleanXSS(values[i]);
}
return encodedValues;
} /**
* 重写getParameter方法
* 对请求结果进行过滤
* */
public String getParameter(String parameter) {
String value = super.getParameter(parameter);
if (value == null) {
return null;
}
return cleanXSS(value);
} public String getHeader(String name) {
String value = super.getHeader(name);
if (value == null)
return null;
return cleanXSS(value);
}
/**
* 获取最原始的request
*
* @return
*/
public HttpServletRequest getOrgRequest() {
return orgRequest;
} /**
* 获取最原始的request的静态方法
*
* @return
*/
public static HttpServletRequest getOrgRequest(HttpServletRequest req) {
if (req instanceof XssHttpServletRequestWrapper) {
return ((XssHttpServletRequestWrapper) req).getOrgRequest();
}
return req;
} @Override
public Enumeration<String> getParameterNames() {
Enumeration<String> names = super.getParameterNames();
while(names.hasMoreElements()){
String name = names.nextElement();
name = cleanXSS(name);
}
return names;
} @Override
public Map getParameterMap() { Map paramMap = super.getParameterMap();
if (CollectionUtils.isEmpty(paramMap)) {
return paramMap;
} for (Object value : paramMap.values()) {
String[] str = (String[])value;
if (str != null) {
for (int i = 0; i < str.length; i++) { str[i] = cleanXSS(str[i]);
}
}
}
return paramMap;
} private String cleanXSS(String value) {
value = value.replaceAll("<", "& lt;").replaceAll(">", "& gt;");
//先暂时去除 英文括号的拦截
// value = value.replaceAll("\\(", "& #40;").replaceAll("\\)", "& #41;");
value = value.replaceAll("'", "& #39;");
value = value.replaceAll("eval\\((.*)\\)", "");
value = value.replaceAll("[\\\"\\\'][\\s]*javascript:(.*)[\\\"\\\']","\"\"");
value = value.replaceAll("script", "");
value = value.replaceAll("alert", ""); return value;
}
}
第三步在web.xml中配置:
<filter>
<filter-name>struts-xssFilter</filter-name>
<filter-class>
com.ulic.ulcif.filter.XssFilter
</filter-class>
</filter> <filter-mapping>
<filter-name>struts-xssFilter</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
到此为止xss在struts2中得到了解决,那么非struts2中xss漏洞怎么解决呢,简单,将第二步换成:如下代码
package com.ulic.ulcif.requestwrapper; import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper; /**
* 写一个 Filter，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，替换成安全的，例如：< > ' " \ / # & 。
*
* 方法:实现一个自定义的 HttpServletRequestWrapper，然后在 Filter 里面调用它，替换掉 getParameter 函数即可
*/
public class XssHttpServletRequestWrapper extends HttpServletRequestWrapper { HttpServletRequest orgRequest = null; public XssHttpServletRequestWrapper(HttpServletRequest servletRequest) {
super(servletRequest);
orgRequest = servletRequest;
} /**
* 重写getParameterValues方法
* 通过循环取出每一个请求结果
* 再对请求结果进行过滤
* */
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] = cleanXSS(values[i]);
}
return encodedValues;
} /**
* 重写getParameter方法
* 对请求结果进行过滤
* */
public String getParameter(String parameter) {
String value = super.getParameter(parameter);
if (value == null) {
return null;
}
return cleanXSS(value);
} public String getHeader(String name) {
String value = super.getHeader(name);
if (value == null)
return null;
return cleanXSS(value);
} private String cleanXSS(String value) {
value = value.replaceAll("<", "& lt;").replaceAll(">", "& gt;");
//先暂时去除 英文括号的拦截
// value = value.replaceAll("\\(", "& #40;").replaceAll("\\)", "& #41;");
value = value.replaceAll("'", "& #39;");
value = value.replaceAll("eval\\((.*)\\)", "");
value = value.replaceAll("[\\\"\\\'][\\s]*javascript:(.*)[\\\"\\\']","\"\"");
value = value.replaceAll("script", "");
value = value.replaceAll("alert", ""); return value;
}
}