...Xen的访问控制 云计算虚拟化面临诸多安全问题，有效采取访问控制策略能有效解决非法登录、虚拟机流量监控等安全问题。Xen通过自己的访问控制模块(Access control module，ACM)。能有效解决诸多访问不当造成的安全问题。
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传统的访问控制模块的设计与应用系统紧密耦合，使其无法得到很好的复用。
Conventionally, access control module is tightly integrated into the application system, which makes it difficult to reuse the access control module in the new systems.
访问控制模块利用完整性锁结构实现元组级强制访问控制，利用SQL语句分析实现属性级强制访问控制。
The access control module of DSPS enforces tuple level MAC through Integrity lock and enforce attribute level MAC through SQL commands parsing and controlling.
在第二个阶段，每个登录模块提交它的登录的结果，用在登录阶段获取的凭证更新当前访问控制上下文的JAAS Subject。
In the second phase, each login module commits the outcome of its login, updating the JAAS Subject of the current access control context with credentials acquired during the login phase.
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