By default linux users are mapped to SELinux user unconfined_u, which is subject to minimal restrictions. You can greatly improve security of your systems by confining users, that is by mapping them to SELinux users with less privilege.
confined_users-playbook.yml contains an example configuration for confining existing users and creating new ones with varying levels of access.
- Set default user mapping
- Confine existing users accounts
- Create new confined user account
- Set booleans to customize access
SELinux policy provides several booleans for customizing access of confined users.
selinux_booleans is expected to hold a list of booleans together with their intended value and persistence setting.
Formally it is a list of dict, where each dict is in the same format as used by the
seboolean
module.
selinux_booleans:
- {name: 'ssh_sysadm_login', state: 'on', persistent: 'yes'}
- {name: 'user_exec_content', state: 'off', persistent: 'yes'}See confined users documentation for a list of relevant booleans.
Specify a list of privileged users to be added to the target system. The new user accounts will be assigned to SELinux user staff_u and granted the ability to use sudo to perform administrative tasks.
privileged_users:
- "Mark"
- "Roger"Manage the linux user to SELinux user mapping. This is a list of dict,
where each dict is in the same format as used by the
selogin
module.
selinux_logins:
- {login: 'plautrba', seuser: 'staff_u', state: 'absent'}
- {login: '__default__', seuser: 'staff_u', serange: 's0-s0:c0.c1023', state: 'present'}__default__ is the value assigned to a new user when no login mapping is specified for them. All other lines must correspond to existing user accounts. Note that changing a login mapping changes the file context definitions of the user's home directory. This change is applied using restorecon at the end of the playbook.
Confining users is demonstrated in confined_users-playbook.yml playbook.