linux_wiki:create_and_manage_access_control_lists_acls

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linux_wiki:create_and_manage_access_control_lists_acls [2016/03/03 22:17]
billdozor 		linux_wiki:create_and_manage_access_control_lists_acls [2019/05/25 23:50]
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-====== Create And Manage Access Control Lists Acls ====== 
- 
-**General Information** 
- 
-Access Control Lists are additional permissions that allow advanced type of access beyond the standard "user, group, others" categories.  
- 
----- 
- 
-===== View ACLs ===== 
- 
-Show ACL permissions 
-<code bash> 
-getfacl file1 
- 
-# file: file1 
-# owner: root 
-# group: root 
-user::rw- 
-group::r-- 
-other::r-- 
-</code> 
-  * The above is a new file created by root, with no extended ACL permissions set 
-  * getfacl = get file access control lists 
- 
----- 
- 
-===== Setting ACLs ===== 
- 
-Set ACL for the user, yoda to give him write permissions 
-<code bash> 
-setfacl -m u:yoda:rw file1 
- 
-getfacl file1 
-# file: file1 
-# owner: root 
-# group: root 
-user::rw- 
-user:yoda:rw- 
-group::r-- 
-mask::rw- 
-other::r-- 
-</code> 
-  * Now, the same file with extended ACL permissions for the user, yoda 
-  * -m => modify 
-  * u:yoda:rw => user yoda, read and write permissions 
-  * mask = max level permissions for ACLs 
- 
-\\ 
-Notice the "+" at the end of permissions in a file listing, indicating an ACL exists 
-<code bash> 
-ll 
-total 4 
--rw-rw-r--+ 1 root root 0 Jul  5 16:25 file1 
-</code> 
- 
-\\ 
-Update the mask (max ACL permissions) to read 
-<code bash> 
-setfacl -m m::r file1 
- 
-getfacl file1 
-# file: file1 
-# owner: root 
-# group: root 
-user::rw- 
-user:yoda:rw- #effective:r-- 
-group::r-- 
-mask::r-- 
-other::r-- 
-</code> 
-  * m::r => set mask for all to read permissions. This means that even though yoda has rw, the max anyone can have is read. 
- 
-\\ 
-Set ACL for a group 
-<code bash> 
-setfacl -m g:jedi:rw file1 
- 
-getfacl file1  
-# file: file1 
-# owner: root 
-# group: root 
-user::rw- 
-user:yoda:rw- 
-group::r-- 
-group:jedi:rw- 
-mask::rw- 
-other::r-- 
-</code> 
-  * g:jedi:rw => group "jedi" with read and write permissions 
- 
-Set default ACL for new files/directories created within dir1 for users 
-<code bash> 
-setfacl -m d:u::rw dir1 
-</code> 
-  * Note: Default permissions does NOT give those permissions to dir1 itself 
- 
-\\ 
-Remove default ACLs 
-<code bash> 
-setfacl --remove-default dir 
-</code> 
-  * Remove all ACLs (including default): setfacl --remove-all dir 
- 
-\\ 
-Remove a single user's ACL 
-<code bash> 
-setfacl -x u:yoda file1 
-OR 
-setfacl --remove u:yoda file1 
-</code> 
- 
-\\ 
-Copy ACL from file1 and apply it to file2 
-<code bash> 
-getfacl file1 | setfacl --set-file=- file2 
-</code> 
-  * Notice the --set-file=-, the "-" means from standard input 
- 
----- 
  
  • linux_wiki/create_and_manage_access_control_lists_acls.txt
  • Last modified: 2019/05/25 23:50
  • (external edit)