'Set user id bit' presentation slideshows

TEL2813/IS2820 Security Management

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Access Control and Operating System Security

Access Control and Operating System Security. John Mitchell. Access Control Matrix, ACL, Capabilities Multi-level security (MLS) OS Policies Multics Ring structure Unix File system, Setuid Windows File system, Tokens, EFS SE Linux Role-based Domain type enforcement. Secure OS

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Outline

Access Control Concepts Matrix, ACL, Capabilities OS Mechanisms Amoeba Distributed, capabilities Unix File system, Setuid Windows File system, EFS Guidelines for designing a Secure OS. Outline. Overview of an OS Functions. Access control. Common Assumption

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September 7, 2006 Lecture 2

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October 18, 2005

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Files and Directories

Files and Directories. File types stat functions for file information File permissions suid and sgid Sticky bit Hard link and soft link Directory operations Device special files File system. File Types. Regular file Directory file Character special file (unbuffered I/O access)

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Unix Basics

Unix Basics. Lecture 14. UNIX Introduction. The UNIX operating system is made up of three parts; the kernel, the shell and the programs. The kernel of UNIX is the hub of the operating system:

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email

email. As System Administrators it is important that you learn how to use electronic forms of communication. Start checking your e-mail regularly. Mail server: sendmail daemon Mail client: elm , pine , mail , etc Where is my mail stored in the mail server? /var/spool/mail/ username

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Operating Systems

Operating Systems. Recitation 11, June 9-10, 2002. Motivation. Privileged facility needs to be available for general users. Example: Allow user to perform specific operation that requires root permissions. Process and file identities. Process: (user ID, group ID) x (real, effective)

232 views • 17 slides