SpringMVC防止XSS注入

xss（Cross Site Scripting）注入就是，跨站脚本攻击，和sql注入类似的，在请求中添加恶意脚本，实现控制用户。

XssHttpServletRequestWrappe.java

重写XssHttpServletRequestWrapper中的方法：

package com.henu.util;

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

/**
* XSS
*
* @author duxiangyu
*
*/
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] = cleanXSS(values[i]);
}
return encodedValues;
}

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);
}

// 这里可以自己实现转义，也可以直接用工具类进行转义，比如说org.apache.common.lang.StringEscapeUtils和org.springframework.web.util.HtmlUtils
private String cleanXSS(String str) {
StringBuffer sb = new StringBuffer();
for (int i = 0; i < str.length(); i++) {
char c = str.charAt(i);

switch (c) {
case '\n':
sb.append(c);
break;
case '<':
sb.append("<");
break;
case '>':
sb.append(">");
break;
case '&':
sb.append("&");
break;
case '\'':
sb.append("'");
break;
case '"':
sb.append(""");
break;
default:
if ((c < ' ') || (c > '~')) {
sb.append("&#x");
sb.append(Integer.toString(c, 16));
sb.append(';');
} else {
sb.append(c);
}
break;
}
}
return sb.toString();
}
}

XssFilter.java

写个拦截器，对请求进行拦截过滤：

package com.henu.util;

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;

/**
* XSS 过滤器
*
* @author duxiangyu
*
*/
public class XssFilter implements Filter {
FilterConfig filterConfig = null;

public void init(FilterConfig filterConfig) throws ServletException {
this.filterConfig = filterConfig;
}

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

// 对request进行包装
public void doFilter(ServletRequest request, ServletResponse response,
FilterChain chain) throws IOException, ServletException {
chain.doFilter(new XssHttpServletRequestWrapper(
(HttpServletRequest) request), response);
}
}

在web.xml中配置拦截器，对所有的.ht请求进行过滤：

<filter>
<filter-name>xssFilter</filter-name>
<filter-class>com.henu.util.XssFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>xssFilter</filter-name>
<url-pattern>*.ht</url-pattern>
<dispatcher>REQUEST</dispatcher>
</filter-mapping>