Security-Enhanced Linux secures the xauth processes via flexible mandatory access control.
If you want to allow users to resolve user passwd entries directly from ldap rather then using a sssd serve for the xauth_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 xauth_t, you must turn on the kerberos_enabled boolean.
setsebool -P kerberos_enabled 1
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 xauth policy is very flexible allowing users to setup their xauth processes in as secure a method as possible.
The following file types are defined for xauth:
xauth_exec_t
- Set files with the xauth_exec_t type, if you want to transition an executable to the xauth_t domain.
xauth_home_t
- Set files with the xauth_home_t type, if you want to store xauth files in the users home directory.
xauth_tmp_t
- Set files with the xauth_tmp_t type, if you want to store xauth temporary files in the /tmp directories.
Note: File context can be temporarily modified with the chcon command. If you want to permanently 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.
You can see the context of a process using the -Z option to psP Policy governs the access confined processes have to files. SELinux xauth policy is very flexible allowing users to setup their xauth processes in as secure a method as possible.
The following process types are defined for xauth:
xauth_t
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.
The SELinux user type xauth_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.
user_home_t
/home/[^/]*/.+
user_tmp_t
/var/run/user(/.*)?
/tmp/gconfd-.*
xauth_home_t
/root/.xauth.*
/root/.Xauth.*
/root/.serverauth.*
/root/.Xauthority.*
/var/lib/pqsql/.xauth.*
/var/lib/pqsql/.Xauthority.*
/var/lib/nxserver/home/.xauth.*
/var/lib/nxserver/home/.Xauthority.*
/home/[^/]*/.xauth.*
/home/[^/]*/.Xauth.*
/home/[^/]*/.serverauth.*
/home/[^/]*/.Xauthority.*
xauth_tmp_t
xdm_tmp_t
/tmp/.X11-unix(/.*)?
/tmp/.ICE-unix(/.*)?
/tmp/.X0-lock
xdm_var_run_t
/etc/kde[34]?/kdm/backgroundrc
/var/run/[gx]dm.pid
/var/run/[kgm]dm(/.*)?
/usr/lib/qt-.*/etc/settings(/.*)?
/var/run/slim.*
/var/run/lxdm(/.*)?
/var/run/slim(/.*)?
/var/run/xauth(/.*)?
/var/run/xdmctl(/.*)?
/var/run/lightdm(/.*)?
/var/run/systemd/multi-session-x(/.*)?
/var/run/lxdm.pid
/var/run/lxdm.auth
/var/run/gdm_socket