tomcat CORS跨域资源共享漏洞

CORS跨域资源共享（Cross-Origin Resource Sharing, CORS）是一种机制，它使用额外的HTTP头来告诉浏览器跨域的网页上的资源应该如何被加载。如果配置不当，可能会导致安全问题，比如Tomcat CORS跨域资源共享漏洞。

解决方法：

1. 在Tomcat的配置文件中设置CORS过滤器，以指定哪些域可以访问资源，以及允许哪些HTTP方法和头信息。

示例配置（在web.xml中添加）：

<filter>
    <filter-name>CORS</filter-name>
    <filter-class>com.thetransactioncompany.cors.CORSFilter</filter-class>
    <init-param>
        <param-name>cors.allowOrigin</param-name>
        <param-value>*</param-value>
    </init-param>
    <init-param>
        <param-name>cors.supportedMethods</param-name>
        <param-value>GET, POST, HEAD</param-value>
    </init-param>
    <init-param>
        <param-name>cors.supportedHeaders</param-name>
        <param-value>Accept, Origin, X-Requested-With, Content-Type, Last-Modified</param-value>
    </init-param>
    <init-param>
        <param-name>cors.exposedHeaders</param-name>
        <param-value>Set-Cookie</param-value>
    </init-param>
    <init-param>
        <param-name>cors.supportsCredentials</param-name>
        <param-value>true</param-value>
    </init-param>
</filter>
<filter-mapping>
    <filter-name>CORS</filter-name>
    <url-pattern>/*</url-pattern>
</filter-mapping>

2. 使用Tomcat的安全库catalina.jar中的org.apache.catalina.filters.CorsFilter类。

示例配置（在web.xml中添加）：

<filter>
    <filter-name>CORS</filter-name>
    <filter-class>org.apache.catalina.filters.CorsFilter</filter-class>
    <init-param>
        <param-name>cors.allowed.origins</param-name>
        <param-value>*</param-value>
    </init-param>
    <init-param>
        <param-name>cors.allowed.methods</param-name>
        <param-value>GET, POST, HEAD, OPTIONS</param-value>
    </init-param>
    <init-param>
        <param-name>cors.allowed.headers</param-name>
        <param-value>Origin, Accept, X-Requested-With, Content-Type, Access-Control-Request-Method, Access-Control-Request-Headers</pa