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Delwin Thermitus
Cyber Security
Permissions
-
Using ‘ls -l’ to see permissions information on files in a directory
You can see what permissions the owner, group and the world have regarding their
ability to read, write or execute a file
...
(-rwxr----)
▪ Read, write and execute
Setting File Permissions
-
You can set Permissions on a file or folder using chmod
Permission Type
o
Permission Type
o
Symbol
o
0
...
Execute
o
‘ -x ‘
o
2
...
Write and Execute
o
‘-wx’
o
4
...
Read and Execute
o
‘r-x’
o
6
...
Read/Write/Execute
o
‘rwx’
-
User Commands
Chmod = Change Mode(Modify)
SU = Switch user
Chuser = Change user
Chown = Change owner
Nano/vi = Modify
-
Setting SUID and SGID
Super user ID(SUID): run an application as the owner
Set group ID(SGID): Run an application as the group assigned to the file
Stickybit: Prevents deletion of files except by the owner/root