springboot通过Referer防止跨站点请求伪造

原文链接：https://blog.csdn.net/qq_44154912/article/details/127439461

防止跨站点请求伪造
验证“Referer”头的值，并对每个提交的表单使用 one-time-nonce

在application.yml 中添加配置

# 防止 跨站点请求伪造, RefererFilter.java
security:
csrf:
# 开启过滤
enable: true
# 白名单接口 每个接口用 , 分隔
excludes:
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我使用的是若依框架, 在common的filter包下添加 RefererFilter 类

package com.vxdata.common.filter;

import com.vxdata.common.utils.StringUtils;
import lombok.Data;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.autoconfigure.condition.ConditionalOnProperty;
import org.springframework.context.annotation.Configuration;
import org.springframework.http.HttpStatus;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.util.Arrays;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

//@Configuration
@ConditionalOnProperty(prefix = "security.csrf", name = "enable", havingValue = "true")
@Configuration
@WebFilter(filterName = "refererFilter", urlPatterns = "/*")
@Data
public class RefererFilter implements Filter {
public static final Logger logger = LoggerFactory.getLogger(RefererFilter.class);

/**
* 过滤器配置对象
*/
FilterConfig filterConfig = null;

/**
* 是否启用
*/
@Value("${security.csrf.enable:false}")
private boolean enable = true;

/**
* 忽略的URL
*/
@Value("${security.csrf.excludes:}")
private String excludes;

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

@Override
public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain)
throws IOException, ServletException {
HttpServletRequest request = (HttpServletRequest) servletRequest;
// 不启用或者已忽略的URL不拦截
if (!enable || isExcludeUrl(request.getServletPath())) {
filterChain.doFilter(servletRequest, servletResponse);
return;
}

String referer = request.getHeader("Referer");
String serverName = request.getServerName();

// 判断是否存在外链请求本站
if (referer == null || !referer.contains(serverName)) {
logger.error("Referer过滤器 服务器：{} 当前域名：{}", serverName, referer);
HttpServletResponse resp = (HttpServletResponse) servletResponse;
resp.setStatus(HttpStatus.NOT_FOUND.value());
return;
} else {
filterChain.doFilter(servletRequest, servletResponse);
}
}

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

/**
* 判断是否为忽略的URL
* <p>
* <p>
* URL路径
*
* @return true-忽略，false-过滤
*/
private boolean isExcludeUrl(String url) {
if (StringUtils.isBlank(excludes)) {
return false;
}
List<String> urls = Arrays.asList(excludes.trim().split(","));
// return urls.stream().filter(StringUtils::isNotBlank).map(pattern -> Pattern.compile("^" + pattern.trim()))
// .map(p -> p.matcher(url)).anyMatch(Matcher::find);
for (String uri : urls) {
// 正则验证
Pattern p = Pattern.compile("^" + uri);
if (p.matcher(url).find()) {
return true;
}
}
return false;
}
}
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获取 referer 为null, 无法获取 referer 导致过滤失败
正常情况前端请求接口的时候, 请求表头中会有一个 referer 属性, 会携带当前前端页面路由信息
我们根据这个路由信息判断是不是我们的前端来访问接口的

如果前端访问时候没有这个referer 信息

浏览器打开检查, 查看页面元素, 看head标签中是否配置了 no-referrer
我这里删掉 < meta name=“referrer” content=“no-referrer”> 后就有 referer 了