임베디드 OS에서의 역할기반 접근제어 적용

Recently, the security requirements of the embedded system which were not considered when the embedded system is independently deployed are being increased because the embedded system is connected to an internet. The connection to the internet of embedded system is the meaning that it is exposed to the various kinds of external attack and can be a victim to these attacks in anytime. Particularly, it is trend that the user-related information is stored into the personal terminals and/or electrical appliances such as PDA, home gateway for home network, settop boxes and so on. So it is needed the security mechanism which protects the user information from the malicious accesses. Accordingly, the coverage of the system security is being expanded from the general server to the embedded system. And it is not enough that the embedded system supports only its inherent functions and it becomes the essential element to provide the security function to the embedded system. This paper applies the RBAC(role-based access control) function to the embedded linux OS and tries to strengthen the security of the embedded linux OS. RBAC is implemented as a loadable kernel module with LSM(Linux Security Module) security framework for user's flexibility.