xdm_selinux(8) xdm SELinux Policy documentation xdm_selinux(8)NAMExdm_selinux - Security Enhanced Linux Policy for the xdm processes
DESCRIPTION
Security-Enhanced Linux secures the xdm processes via flexible manda‐
tory access control.
BOOLEANS
SELinux policy is customizable based on least access required. xdm
policy is extremely flexible and has several booleans that allow you to
manipulate the policy and run xdm with the tightest access possible.
If you want to allow the graphical login program to login directly as
sysadm_r:sysadm_, you must turn on the xdm_sysadm_login boolean.
setsebool -P xdm_sysadm_login 1
If you want to allow the graphical login program to execute bootloade,
you must turn on the xdm_exec_bootloader boolean.
setsebool -P xdm_exec_bootloader 1
NSSWITCH DOMAIN
If you want to allow users to login using a sssd serve for the
xdm_dbusd_t, xdm_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
xdm_dbusd_t, xdm_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 xdm_dbusd_t, xdm_t,
you must turn on the allow_ypbind boolean.
setsebool -P allow_ypbind 1
FILE CONTEXTS
SELinux 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 ls
Policy governs the access confined processes have to these files.
SELinux xdm policy is very flexible allowing users to setup their xdm
processes in as secure a method as possible.
The following file types are defined for xdm:
xdm_etc_t
- Set files with the xdm_etc_t type, if you want to store xdm files in
the /etc directories.
xdm_exec_t
- Set files with the xdm_exec_t type, if you want to transition an exe‐
cutable to the xdm_t domain.
Paths:
/usr/a/(s)?bin/[xgkw]?dm, /usr/bin/slim, /usr/(s)?bin/lightdm*,
/usr/(s)?bin/[mxgkw]dm, /usr/sbin/mdm-binary,
/usr/(s)?bin/lxdm(-binary)?, /usr/X11R6/bin/[xgkw]dm,
/usr/(s)?bin/gdm-binary, /usr/bin/gpe-dm, /opt/kde3/bin/kdm
xdm_home_t
- Set files with the xdm_home_t type, if you want to store xdm files in
the users home directory.
Paths:
/root/.xsession-errors.*, /root/.dmrc.*
xdm_lock_t
- Set files with the xdm_lock_t type, if you want to treat the files as
xdm lock data, stored under the /var/lock directory
xdm_log_t
- Set files with the xdm_log_t type, if you want to treat the data as
xdm log data, usually stored under the /var/log directory.
Paths:
/var/log/slim.log, /var/log/lxdm.log.*, /var/log/[mg]dm(/.*)?,
/var/log/[mkwx]dm.log.*
xdm_rw_etc_t
- Set files with the xdm_rw_etc_t type, if you want to store xdm rw
files in the /etc directories.
Paths:
/etc/opt/VirtualGL(/.*)?, /etc/X11/wdm(/.*)?
xdm_spool_t
- Set files with the xdm_spool_t type, if you want to store the xdm
files under the /var/spool directory.
xdm_tmp_t
- Set files with the xdm_tmp_t type, if you want to store xdm temporary
files in the /tmp directories.
Paths:
/tmp/.X0-lock, /tmp/.X11-unix(/.*)?, /tmp/.ICE-unix(/.*)?
xdm_tmpfs_t
- Set files with the xdm_tmpfs_t type, if you want to store xdm files
on a tmpfs file system.
xdm_unconfined_exec_t
- Set files with the xdm_unconfined_exec_t type, if you want to transi‐
tion an executable to the xdm_unconfined_t domain.
Paths:
/etc/gdm/PostLogin(/.*)?, /etc/gdm/Init(/.*)?, /etc/gdm/PreSes‐
sion(/.*)?, /etc/gdm/PostSession(/.*)?
xdm_var_lib_t
- Set files with the xdm_var_lib_t type, if you want to store the xdm
files under the /var/lib directory.
Paths:
/var/lib/lightdm(/.*)?, /var/lib/[gxkw]dm(/.*)?,
/var/cache/lightdm(/.*)?, /var/lib/[mxkwg]dm(/.*)?,
/var/lib/lxdm(/.*)?, /var/cache/[mg]dm(/.*)?
xdm_var_run_t
- Set files with the xdm_var_run_t type, if you want to store the xdm
files under the /run directory.
Paths:
/var/run/slim.*, /var/run/lxdm(/.*)?, /usr/lib/qt-.*/etc/set‐
tings(/.*)?, /var/run/lxdm.auth, /var/run/systemd/multi-session-
x(/.*)?, /var/run/xauth(/.*)?, /var/run/xdmctl(/.*)?,
/var/run/[gx]dm.pid, /var/run/[kgm]dm(/.*)?, /var/run/slim(/.*)?,
/var/run/gdm_socket, /etc/kde3?/kdm/backgroundrc,
/var/run/lxdm.pid, /var/run/lightdm(/.*)?
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 data‐
base. You will need to use restorecon to apply the labels.
PORT TYPES
SELinux defines port types to represent TCP and UDP ports.
You can see the types associated with a port by using the following
command:
semanage port -l
Policy governs the access confined processes have to these ports.
SELinux xdm policy is very flexible allowing users to setup their xdm
processes in as secure a method as possible.
The following port types are defined for xdm:
xdmcp_port_t
Default Defined Ports:
tcp 177
udp 177
PROCESS TYPES
SELinux defines process types (domains) for each process running on the
system
You can see the context of a process using the -Z option to ps
Policy governs the access confined processes have to files. SELinux
xdm policy is very flexible allowing users to setup their xdm processes
in as secure a method as possible.
The following process types are defined for xdm:
xdm_t, xdm_dbusd_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.
COMMANDS
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 pol‐
icy modules.
semanage port can also be used to manipulate the port definitions
semanage boolean can also be used to manipulate the booleans
system-config-selinux is a GUI tool available to customize SELinux pol‐
icy settings.
AUTHOR
This manual page was autogenerated by genman.py.
SEE ALSOselinux(8), xdm(8), semanage(8), restorecon(8), chcon(1) , setsebool(8)dwalsh@redhat.com xdm xdm_selinux(8)
