SELinux supports Roles Based Access Control (RBAC), some Linux roles are login roles, while other roles need to be transition into.
Note: Examples in this man page will use the staff_u SELinux user.
Non login roles are usually used for administrative tasks. For example, tasks that require root privileges. Roles control which types a user can run processes with. Roles often have default types assigned to them.
The default type for the unconfined_r role is unconfined_t.
The newrole program to transition directly to this role.
newrole -r unconfined_r -t unconfined_t
sudo is the preferred method to do transition from one role to another. You setup sudo to transition to unconfined_r by adding a similar line to the /etc/sudoers file.
USERNAME ALL=(ALL) ROLE=unconfined_r TYPE=unconfined_t COMMAND
sudo will run COMMAND as staff_u:unconfined_r:unconfined_t:LEVEL
When using a non login role, you need to setup SELinux so that your SELinux user can reach unconfined_r role.
Execute the following to see all of the assigned SELinux roles:
semanage user -l
You need to add unconfined_r to the staff_u user. You could setup the staff_u user to be able to use the unconfined_r role with a command like:
$ semanage user -m -R 'staff_r system_r unconfined_r' staff_u
SELinux policy is customizable based on least access required. unconfined policy is extremely flexible and has several booleans that allow you to manipulate the policy and run unconfined with the tightest access possible.
If you want to allow a unconfined user to dynamically transition to a new context using setcon, you must turn on the unconfined_dyntrans_all boolean. Disabled by default.
setsebool -P unconfined_dyntrans_all 1
If you want to determine whether crond can execute jobs in the user domain as opposed to the the generic cronjob domain, you must turn on the cron_userdomain_transition boolean. Enabled by default.
setsebool -P cron_userdomain_transition 1
If you want to deny user domains applications to map a memory region as both executable and writable, this is dangerous and the executable should be reported in bugzilla, you must turn on the deny_execmem boolean. Enabled by default.
setsebool -P deny_execmem 1
If you want to control the ability to mmap a low area of the address space, as configured by /proc/sys/vm/mmap_min_addr, you must turn on the mmap_low_allowed boolean. Disabled by default.
setsebool -P mmap_low_allowed 1
If you want to disable kernel module loading, you must turn on the secure_mode_insmod boolean. Enabled by default.
setsebool -P secure_mode_insmod 1
If you want to allow unconfined executables to make their heap memory executable. Doing this is a really bad idea. Probably indicates a badly coded executable, but could indicate an attack. This executable should be reported in bugzilla, you must turn on the selinuxuser_execheap boolean. Disabled by default.
setsebool -P selinuxuser_execheap 1
If you want to allow unconfined executables to make their stack executable. This should never, ever be necessary. Probably indicates a badly coded executable, but could indicate an attack. This executable should be reported in bugzilla, you must turn on the selinuxuser_execstack boolean. Disabled by default.
setsebool -P selinuxuser_execstack 1
The SELinux process type unconfined_t can manage files labeled with the following file types. The paths listed are the default paths for these file types. Note the processes UID still need to have DAC permissions.
all files on the system
semanage fcontext can also be used to manipulate default file context mappings.
semanage permissive can also be used to manipulate whether or not a process type is permissive.
semanage module can also be used to enable/disable/install/remove policy modules.
semanage boolean can also be used to manipulate the booleans
system-config-selinux is a GUI tool available to customize SELinux policy settings.
This manual page was auto-generated using sepolicy manpage .
selinux(8), unconfined(8), semanage(8), restorecon(8), chcon(1), sepolicy(8), setsebool(8), unconfined_cronjob_selinux(8), unconfined_dbusd_selinux(8), unconfined_mount_selinux(8), unconfined_munin_plugin_selinux(8), unconfined_sendmail_selinux(8), unconfined_service_selinux(8)