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content/notes/24-protection-of-file-systems.md
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@ -23,5 +23,20 @@ types of file access users can have
- if a directory is not executable you cannot get into it (run it) - if a directory is not executable you cannot get into it (run it)
# Access control bits # Access control bits
three classes for each file
- owner: user who created the file
- group : set of users who are sharing the file: a group is defined by the systems
- others: all other in the system
when a file is create it has an owner id and a group id to identify the users of the file
3 permission bits for each class
- r: readable
- w: writeable
- x: executble
advanced file attributes
- setuid bit: if set for executable file, regardless of who runs the program, it should be run with the priviledge of the owner of the file
- setgid bit: same as setuid but run with priviledge of group
- sticky bit: a directory with this bit set restricts the deletionof files within it
# access control models # access control models