Subject, object, operation and permission
From Erights
(Difference between revisions)
(The definition of the term `permissions' was simplified not to scare the reader with the notion of a ternary relation. Rather, some well chosen examples may make that more clear.) |
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In general, the set of existing objects and subjects changes over time. | In general, the set of existing objects and subjects changes over time. | ||
| - | '''Permissions''' is a relation that defines which operations on what objects are permitted for particular subjects. | + | '''Permissions''' is a relation that defines which operations on what objects are permitted for particular subjects. |
Revision as of 07:59, 15 June 2009
Definition
From a security point of view, we recognize:
- subjects
- objects
Subjects are active entities (e.g. UNIX processes) with some behavior. Subjects can designate objects and try to perform some supported operations with them.
What kind of operations can be performed with an object depends on its type.
In general, the set of existing objects and subjects changes over time.
Permissions is a relation that defines which operations on what objects are permitted for particular subjects.
