我们的Java网站今天遇到了一些问题，需要一个快速解决的方案，以保护网站恶意跨站脚本（XSS）的尝试。我不是说这是一个完美的解决方案，但它很容易实施和纠正 漏洞 ，表单和URL注入。我们基本上可以通过Servlet过滤器拦截每个发送到Web应用程序的请求，然后我们用一个HttpServletRequestWrapper 来包装和重写 getParameter 方法，清除任何可能的脚本注入。
Here's the Filter:
package com.greatwebguy.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;
public class CrossScriptingFilter implements Filter {
public void init(FilterConfig filterConfig) throws ServletException {
this.filterConfig = filterConfig;
}
public void destroy() {
this.filterConfig = null;
}
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain)
throws IOException, ServletException {
chain.doFilter(new RequestWrapper((HttpServletRequest) request), response);
}
}
Here's the wrapper:
package com.greatwebguy.filter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletRequestWrapper;
public final class RequestWrapper extends HttpServletRequestWrapper {
public RequestWrapper(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);
}
private String cleanXSS(String value) {
//You'll need to remove the spaces from the html entities below
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;
}
}
添加到您的 web.xml 的顶部： www.2cto.com
<filter>
<filter-name>XSS</filter-name>
<display-name>XSS</display-name>
<description></description>
<filter-class>com.greatwebguy.filter.CrossScriptingFilter</filter-class>
</filter>
<filter-mapping>
<filter-name>XSS</filter-name>
<url-pattern>/*</url-pattern>
</filter-mapping>
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