ACL | Advanced Linux File Permissions | RHCSA Certification #13 | Tech Arkit | EX200

POSIX Access Control List ACL To manage file security using POSIX (Portable Operating System Interface) access control list ( ACL ).
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ACLs allows to assign different permissions for different users and groups. ACL allows fine-grained permissions to be allocated to a file. Users or groups as well as users and groups identified by a UID or GUID can be granted permissions.
The same permissions we can use below flags apply on files and directories.
Alpha Symbols
r: Read
w: Write
x: Execute
Numeric symbols
4 - Read
2 - Write
1 - Execute
- Permissions restricting access to a file to the file owner, membership of a single group or everyone.
- The file owner can set ACLs on individual files or directories.
- XFS file systems have built in ACL support.
- EXT4 file systems created on RHEL7 have ACL enabled by default.
POSIX Access Control List two types:
Access ACLs: we can use access ACLs to grant permissions for a particular file or directory.
Default ACLs: We can use default ACLs only on a directory but if a file inside that directory does not have an ACL, it inherits the permissions of the default ACLs of the directory.
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