Usando ACL - Access Control List

O ACL permite manter as permições do usuário e grupo. Mesmo que um usuário pertencente ao grupo crie um arquivo, o mesmo arquivo fica com o grupo deste mesmo usuário.

Para poder utilizar o ACL é necessário que a partição tenha sido montado com acl eemplo:

mariouzae@mgusilva:# mount -t ext3 -o acl /dispositivo /local

Despois de montar a partição com o ACL você já pode começar a configurar as permições, exemplo:

setfacl -m  

Rules () must be specified in the following formats. Multiple rules can be specified in the same command if they are separated by commas.

u::

Sets the access ACL for a user. The user name or UID may be specified. The user may be any valid user on the system.

g::

Sets the access ACL for a group. The group name or GID may be specified. The group may be any valid group on the system.

m:

Sets the effective rights mask. The mask is the union of all permissions of the owning group and all of the user and group entries.

o:

Sets the access ACL for users other than the ones in the group for the file.

White space is ignored. Permissions () must be a combination of the characters r, w, and x for read, write, and execute.

If a file or directory already has an ACL, and the setfacl command is used, the additional rules are added to the existing ACL or the existing rule is modified.

For example, to give read and write permissions to user andrius:

setfacl -m u:andrius:rw /project/somefile

To remove all the permissions for a user, group, or others, use the -x option and do not specify any permissions:

setfacl -x

For example, to remove all permissions from the user with UID 500:

setfacl -x u:500 /project/somefile

Mario Uzae
e-mail: mariouzae@gmail.com