shutdown_selinux (8) - Linux Man Pages
shutdown_selinux: Security Enhanced Linux Policy for the shutdown processes
NAMEshutdown_selinux - Security Enhanced Linux Policy for the shutdown processes
Security-Enhanced Linux secures the shutdown processes via flexible mandatory access control.
BOOLEANSSELinux policy is customizable based on least access required. shutdown policy is extremely flexible and has several booleans that allow you to manipulate the policy and run shutdown with the tightest access possible.
If you want to allow HTTPD to connect to port 80 for graceful shutdow, you must turn on the httpd_graceful_shutdown boolean.
setsebool -P httpd_graceful_shutdown 1
If you want to allow users to login using a sssd serve for the shutdown_t, you must turn on the authlogin_nsswitch_use_ldap boolean.
setsebool -P authlogin_nsswitch_use_ldap 1
If you want to allow confined applications to run with kerberos for the shutdown_t, you must turn on the allow_kerberos boolean.
setsebool -P allow_kerberos 1
If you want to allow system to run with NI for the shutdown_t, you must turn on the allow_ypbind boolean.
setsebool -P allow_ypbind 1
FILE CONTEXTSSELinux requires files to have an extended attribute to define the file type.
You can see the context of a file using the -Z option to lsP Policy governs the access confined processes have to these files. SELinux shutdown policy is very flexible allowing users to setup their shutdown processes in as secure a method as possible.
The following file types are defined for shutdown:
- Set files with the shutdown_etc_t type, if you want to store shutdown files in the /etc directories.
- Set files with the shutdown_exec_t type, if you want to transition an executable to the shutdown_t domain.
/sbin/shutdown, /usr/sbin/shutdown, /usr/lib/upstart/shutdown, /lib/upstart/shutdown
- Set files with the shutdown_var_run_t type, if you want to store the shutdown files under the /run directory.
Note: File context can be temporarily modified with the chcon command. If you want to permanantly change the file context you need to use the semanage fcontext command. This will modify the SELinux labeling database. You will need to use restorecon to apply the labels.
PROCESS TYPESSELinux defines process types (domains) for each process running on the system
You can see the context of a process using the -Z option to psP Policy governs the access confined processes have to files. SELinux shutdown policy is very flexible allowing users to setup their shutdown processes in as secure a method as possible.
The following process types are defined for shutdown:
Note: semanage permissive -a PROCESS_TYPE can be used to make a process type permissive. Permissive process types are not denied access by SELinux. AVC messages will still be generated.
COMMANDSsemanage 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.