Lesson plan
Access control expression
An access control expression with respect to a computer file system is a list of Boolean expressions attached to a file object. An access control expression specifies a Boolean formula that defines which users or system processes are granted access to objects, as well as what operations are allowed on given objects. Each entry in a typical access control expression specifies an operation and an expression and an operation. For instance, if a file object has an access control expression that contains (read=(g:system OR u:Alice), write=(g:system AND !u:Bob))) , this would give any member of the group or the user named Alice permission to read the file but would allow only members of the group to write the file, except for the user named Bob. Conventional access control lists can be viewed as a subset of access control expressions in which the only combining operation allowed is OR.
Article summary
An access control expression with respect to a computer file system is a list of Boolean expressions attached to a file object. An access control expression specifies a Boolean formula that defines which users or system processes are granted access to objects, as well as what operations are allowed on given objects. Each entry in a typical access control expression specifies an operation and an expression and an operation. For instance, if a file object has an access control expression that contains (read=(g:system OR u:Alice), write=(g:system AND !u:Bob))) , this would give any member of the group or the user named Alice permission to read the file but would allow only members of the group to write the file, except for the user named Bob. Conventional access control lists can be viewed as a subset of access control expressions in which the only combining operation allowed is OR.
Key claims
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Discussion questions
- Summarise the article in your own words. Which single claim would you verify first, and why?
- Which claim in this article is most likely to be revised as the sources update? How would you check its current status?
- If two sources disagreed about one of these facts, what would you need in order to trust one over the other?
Bibliography
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Key claims and bibliography are generated from the same tracked claims and sources as the article page.