1xdm_selinux(8) SELinux Policy xdm xdm_selinux(8)
2
6 xdm_selinux - Security Enhanced Linux Policy for the xdm processes
7
9 Security-Enhanced Linux secures the xdm processes via flexible manda‐
10 tory access control.
11 The xdm processes execute with the xdm_t SELinux type. You can check if
13 you have these processes running by executing the ps command with the
14 -Z qualifier.
15 For example:
17 ps -eZ | grep xdm_t
19
23 The xdm_t SELinux type can be entered via the user_tmp_t, xdm_exec_t
24 file types.
25 The default entrypoint paths for the xdm_t domain are the following:
27 /dev/shm/mono.*, /var/run/user/[^/]+, /tmp/.ICE-unix(/.*)?,
29 /tmp/.X11-unix(/.*)?, /dev/shm/pulse-shm.*, /tmp/.X0-lock,
30 /var/run/user, /tmp/hsperfdata_root, /var/tmp/hsperfdata_root,
31 /home/[^/]+/tmp, /home/[^/]+/.tmp, /var/run/user/[0-9]+,
32 /tmp/gconfd-[^/]+, /usr/s?bin/nodm, /usr/s?bin/gdm(3)?,
33 /usr/s?bin/lightdm*, /usr/s?bin/[mxgkw]dm, /usr/s?bin/gdm-binary,
34 /usr/s?bin/lxdm(-binary)?, /usr/X11R6/bin/[xgkw]dm, /usr/bin/razor-
35 lightdm-.*, /usr/bin/sddm, /usr/bin/slim, /usr/bin/gpe-dm,
36 /opt/kde3/bin/kdm, /usr/sbin/mdm-binary, /usr/bin/sddm-greeter,
37 /etc/rc.d/init.d/x11-common, /usr/libexec/gdm-runtime-config,
38 /usr/libexec/gdm-disable-wayland
39
41 SELinux defines process types (domains) for each process running on the
42 system
43 You can see the context of a process using the -Z option to ps
45 Policy governs the access confined processes have to files. SELinux
47 xdm policy is very flexible allowing users to setup their xdm processes
48 in as secure a method as possible.
49 The following process types are defined for xdm:
51 xdm_t, xdm_unconfined_t
53 Note: semanage permissive -a xdm_t can be used to make the process type
55 xdm_t permissive. SELinux does not deny access to permissive process
56 types, but the AVC (SELinux denials) messages are still generated.
57
60 SELinux policy is customizable based on least access required. xdm
61 policy is extremely flexible and has several booleans that allow you to
62 manipulate the policy and run xdm with the tightest access possible.
63 If you want to allows xdm_t to bind on vnc_port_t(5910), you must turn
67 on the xdm_bind_vnc_tcp_port boolean. Disabled by default.
68 setsebool -P xdm_bind_vnc_tcp_port 1
70 If you want to allow the graphical login program to create, read,
74 write, and delete files in the /boot director and DOS filesystem, you
75 must turn on the xdm_manage_bootloader boolean. Enabled by default.
76 setsebool -P xdm_manage_bootloader 1
78 If you want to allow the graphical login program to login directly as
82 sysadm_r:sysadm_t, you must turn on the xdm_sysadm_login boolean. Dis‐
83 abled by default.
84 setsebool -P xdm_sysadm_login 1
86 If you want to deny user domains applications to map a memory region as
90 both executable and writable, this is dangerous and the executable
91 should be reported in bugzilla, you must turn on the deny_execmem bool‐
92 ean. Disabled by default.
93 setsebool -P deny_execmem 1
95 If you want to deny any process from ptracing or debugging any other
99 processes, you must turn on the deny_ptrace boolean. Disabled by de‐
100 fault.
101 setsebool -P deny_ptrace 1
103 If you want to allow all domains to execute in fips_mode, you must turn
107 on the fips_mode boolean. Enabled by default.
108 setsebool -P fips_mode 1
110 If you want to allow confined applications to run with kerberos, you
114 must turn on the kerberos_enabled boolean. Enabled by default.
115 setsebool -P kerberos_enabled 1
117 If you want to allow system to run with NIS, you must turn on the
121 nis_enabled boolean. Disabled by default.
122 setsebool -P nis_enabled 1
124 If you want to enable polyinstantiated directory support, you must turn
128 on the polyinstantiation_enabled boolean. Disabled by default.
129 setsebool -P polyinstantiation_enabled 1
131 If you want to allow unconfined executables to make their stack exe‐
135 cutable. This should never, ever be necessary. Probably indicates a
136 badly coded executable, but could indicate an attack. This executable
137 should be reported in bugzilla, you must turn on the selinuxuser_exec‐
138 stack boolean. Enabled by default.
139 setsebool -P selinuxuser_execstack 1
141 If you want to support ecryptfs home directories, you must turn on the
145 use_ecryptfs_home_dirs boolean. Disabled by default.
146 setsebool -P use_ecryptfs_home_dirs 1
148 If you want to support fusefs home directories, you must turn on the
152 use_fusefs_home_dirs boolean. Disabled by default.
153 setsebool -P use_fusefs_home_dirs 1
155 If you want to support NFS home directories, you must turn on the
159 use_nfs_home_dirs boolean. Disabled by default.
160 setsebool -P use_nfs_home_dirs 1
162 If you want to support SAMBA home directories, you must turn on the
166 use_samba_home_dirs boolean. Disabled by default.
167 setsebool -P use_samba_home_dirs 1
169
173 SELinux defines port types to represent TCP and UDP ports.
174 You can see the types associated with a port by using the following
176 command:
177 semanage port -l
179 Policy governs the access confined processes have to these ports.
182 SELinux xdm policy is very flexible allowing users to setup their xdm
183 processes in as secure a method as possible.
184 The following port types are defined for xdm:
186 xdmcp_port_t
189 Default Defined Ports:
193 tcp 177
194 udp 177
195
197 The SELinux process type xdm_t can manage files labeled with the fol‐
198 lowing file types. The paths listed are the default paths for these
199 file types. Note the processes UID still need to have DAC permissions.
200 auth_cache_t
202 /var/cache/coolkey(/.*)?
204 auth_home_t
206 /root/.yubico(/.*)?
208 /root/.config/Yubico(/.*)?
209 /root/.google_authenticator
210 /root/.google_authenticator~
211 /home/[^/]+/.yubico(/.*)?
212 /home/[^/]+/.config/Yubico(/.*)?
213 /home/[^/]+/.google_authenticator
214 /home/[^/]+/.google_authenticator~
215 cifs_t
217 dosfs_t
220 faillog_t
223 /var/log/btmp.*
225 /var/log/faillog.*
226 /var/log/tallylog.*
227 /var/run/faillock(/.*)?
228 fusefs_t
230 /var/run/user/[0-9]+/gvfs
232 gnome_initial_setup_var_lib_t
234 /var/lib/gnome-initial-setup(/.*)?
236 gnome_initial_setup_var_run_t
238 /var/run/gnome-initial-setup(/.*)?
240 initrc_var_run_t
242 /var/run/utmp
244 /var/run/random-seed
245 /var/run/runlevel.dir
246 /var/run/setmixer_flag
247 krb5_host_rcache_t
249 /var/tmp/krb5_0.rcache2
251 /var/cache/krb5rcache(/.*)?
252 /var/tmp/nfs_0
253 /var/tmp/DNS_25
254 /var/tmp/host_0
255 /var/tmp/imap_0
256 /var/tmp/HTTP_23
257 /var/tmp/HTTP_48
258 /var/tmp/ldap_55
259 /var/tmp/ldap_487
260 /var/tmp/ldapmap1_0
261 lastlog_t
263 /var/log/lastlog.*
265 nfs_t
267 pam_var_console_t
270 /var/run/console(/.*)?
272 pam_var_run_t
274 /var/(db|adm)/sudo(/.*)?
276 /var/lib/sudo(/.*)?
277 /var/run/sudo(/.*)?
278 /var/run/pam_ssh(/.*)?
279 /var/run/sepermit(/.*)?
280 /var/run/pam_mount(/.*)?
281 /var/run/pam_timestamp(/.*)?
282 security_t
284 /selinux
286 sysfs_t
288 /sys(/.*)?
290 systemd_passwd_var_run_t
292 /var/run/systemd/ask-password(/.*)?
294 /var/run/systemd/ask-password-block(/.*)?
295 tmpfs_t
297 /dev/shm
299 /var/run/shm
300 /usr/lib/udev/devices/shm
301 user_tmp_t
303 /dev/shm/mono.*
305 /var/run/user/[^/]+
306 /tmp/.ICE-unix(/.*)?
307 /tmp/.X11-unix(/.*)?
308 /dev/shm/pulse-shm.*
309 /tmp/.X0-lock
310 /var/run/user
311 /tmp/hsperfdata_root
312 /var/tmp/hsperfdata_root
313 /home/[^/]+/tmp
314 /home/[^/]+/.tmp
315 /var/run/user/[0-9]+
316 /tmp/gconfd-[^/]+
317 user_tmp_type
319 all user tmp files
321 var_auth_t
323 /var/ace(/.*)?
325 /var/rsa(/.*)?
326 /var/lib/abl(/.*)?
327 /var/lib/rsa(/.*)?
328 /var/lib/pam_ssh(/.*)?
329 /var/lib/pam_shield(/.*)?
330 /var/opt/quest/vas/vasd(/.*)?
331 /var/lib/google-authenticator(/.*)?
332 wtmp_t
334 /var/log/wtmp.*
336 xdm_lock_t
338 xdm_log_t
341 /var/log/[mkwx]dm.log.*
343 /var/log/mdm(/.*)?
344 /var/log/lxdm.log.*
345 /var/log/slim.log.*
346 xdm_spool_t
348 /var/spool/[mg]dm(/.*)?
350 xdm_tmpfs_t
352 xdm_var_lib_t
355 /var/lib/[mxkwg]dm(/.*)?
357 /var/cache/[mg]dm(/.*)?
358 /var/lib/gdm(3)?(/.*)?
359 /var/lib/lxdm(/.*)?
360 /var/lib/sddm(/.*)?
361 /var/lib/lightdm(/.*)?
362 /var/cache/lightdm(/.*)?
363 /var/lib/lightdm-data(/.*)?
364 xdm_var_run_t
366 /etc/kde[34]?/kdm/backgroundrc
368 /var/run/[kgm]dm(/.*)?
369 /var/run/gdm(3)?.pid
370 /var/run/gdm(3)?(/.*)?
371 /usr/lib/qt-.*/etc/settings(/.*)?
372 /var/run/slim.*
373 /var/run/lxdm(/.*)?
374 /var/run/sddm(/.*)?
375 /var/run/xauth(/.*)?
376 /var/run/xdmctl(/.*)?
377 /var/run/lightdm(/.*)?
378 /var/run/systemd/multi-session-x(/.*)?
379 /var/run/xdm.pid
380 /var/run/lxdm.pid
381 /var/run/lxdm.auth
382 /var/run/gdm_socket
383 xkb_var_lib_t
385 /var/lib/xkb(/.*)?
387 /usr/X11R6/lib/X11/xkb/.*
388 /usr/X11R6/lib/X11/xkb
389 xserver_log_t
391 /var/[xgkw]dm(/.*)?
393 /usr/var/[xgkw]dm(/.*)?
394 /var/log/gdm(3)?(/.*)?
395 /var/log/Xorg.*
396 /var/log/XFree86.*
397 /var/log/lightdm(/.*)?
398 /var/log/nvidia-installer.log.*
399 xserver_tmpfs_t
401
405 SELinux requires files to have an extended attribute to define the file
406 type.
407 You can see the context of a file using the -Z option to ls
409 Policy governs the access confined processes have to these files.
411 SELinux xdm policy is very flexible allowing users to setup their xdm
412 processes in as secure a method as possible.
413 EQUIVALENCE DIRECTORIES
415 xdm policy stores data with multiple different file context types under
418 the /var/lib/lightdm directory. If you would like to store the data in
419 a different directory you can use the semanage command to create an
420 equivalence mapping. If you wanted to store this data under the /srv
421 directory you would execute the following command:
422 semanage fcontext -a -e /var/lib/lightdm /srv/lightdm
424 restorecon -R -v /srv/lightdm
425 xdm policy stores data with multiple different file context types under
427 the /var/run/gdm(3)? directory. If you would like to store the data in
428 a different directory you can use the semanage command to create an
429 equivalence mapping. If you wanted to store this data under the /srv
430 directory you would execute the following command:
431 semanage fcontext -a -e /var/run/gdm(3)? /srv/gdm(3)?
433 restorecon -R -v /srv/gdm(3)?
434 xdm policy stores data with multiple different file context types under
436 the /var/run/lxdm directory. If you would like to store the data in a
437 different directory you can use the semanage command to create an
438 equivalence mapping. If you wanted to store this data under the /srv
439 directory you would execute the following command:
440 semanage fcontext -a -e /var/run/lxdm /srv/lxdm
442 restorecon -R -v /srv/lxdm
443 STANDARD FILE CONTEXT
445 SELinux defines the file context types for the xdm, if you wanted to
447 store files with these types in a different paths, you need to execute
448 the semanage command to specify alternate labeling and then use re‐
449 storecon to put the labels on disk.
450 semanage fcontext -a -t xdm_unconfined_exec_t '/srv/xdm/content(/.*)?'
452 restorecon -R -v /srv/myxdm_content
453 Note: SELinux often uses regular expressions to specify labels that
455 match multiple files.
456 The following file types are defined for xdm:
458 xdm_etc_t
462 - Set files with the xdm_etc_t type, if you want to store xdm files in
464 the /etc directories.
465 xdm_exec_t
469 - Set files with the xdm_exec_t type, if you want to transition an exe‐
471 cutable to the xdm_t domain.
472 Paths:
475 /usr/s?bin/nodm, /usr/s?bin/gdm(3)?, /usr/s?bin/lightdm*,
476 /usr/s?bin/[mxgkw]dm, /usr/s?bin/gdm-binary, /usr/s?bin/lxdm(-bi‐
477 nary)?, /usr/X11R6/bin/[xgkw]dm, /usr/bin/razor-lightdm-.*,
478 /usr/bin/sddm, /usr/bin/slim, /usr/bin/gpe-dm, /opt/kde3/bin/kdm,
479 /usr/sbin/mdm-binary, /usr/bin/sddm-greeter,
480 /etc/rc.d/init.d/x11-common, /usr/libexec/gdm-runtime-config,
481 /usr/libexec/gdm-disable-wayland
482 xdm_home_t
485 - Set files with the xdm_home_t type, if you want to store xdm files in
487 the users home directory.
488 Paths:
491 /root/.dmrc.*, /root/.wayland-errors.*, /root/.xsession-errors.*,
492 /home/[^/]+/.dmrc.*, /home/[^/]+/.cache/gdm(/.*)?,
493 /home/[^/]+/.wayland-errors.*, /home/[^/]+/.xsession-errors.*,
494 /home/[^/]+/.local/share/xorg(/.*)?
495 xdm_lock_t
498 - Set files with the xdm_lock_t type, if you want to treat the files as
500 xdm lock data, stored under the /var/lock directory
501 xdm_log_t
505 - Set files with the xdm_log_t type, if you want to treat the data as
507 xdm log data, usually stored under the /var/log directory.
508 Paths:
511 /var/log/[mkwx]dm.log.*, /var/log/mdm(/.*)?, /var/log/lxdm.log.*,
512 /var/log/slim.log.*
513 xdm_rw_etc_t
516 - Set files with the xdm_rw_etc_t type, if you want to store xdm rw
518 files in the /etc directories.
519 Paths:
522 /etc/X11/wdm(/.*)?, /etc/opt/VirtualGL(/.*)?
523 xdm_spool_t
526 - Set files with the xdm_spool_t type, if you want to store the xdm
528 files under the /var/spool directory.
529 xdm_tmpfs_t
533 - Set files with the xdm_tmpfs_t type, if you want to store xdm files
535 on a tmpfs file system.
536 xdm_unconfined_exec_t
540 - Set files with the xdm_unconfined_exec_t type, if you want to transi‐
542 tion an executable to the xdm_unconfined_t domain.
543 Paths:
546 /etc/[mg]dm/Init(/.*)?, /etc/[mg]dm/PostLogin(/.*)?,
547 /etc/[mg]dm/PreSession(/.*)?, /etc/[mg]dm/PostSession(/.*)?
548 xdm_unit_file_t
551 - Set files with the xdm_unit_file_t type, if you want to treat the
553 files as xdm unit content.
554 xdm_var_lib_t
558 - Set files with the xdm_var_lib_t type, if you want to store the xdm
560 files under the /var/lib directory.
561 Paths:
564 /var/lib/[mxkwg]dm(/.*)?, /var/cache/[mg]dm(/.*)?,
565 /var/lib/gdm(3)?(/.*)?, /var/lib/lxdm(/.*)?, /var/lib/sddm(/.*)?,
566 /var/lib/lightdm(/.*)?, /var/cache/lightdm(/.*)?,
567 /var/lib/lightdm-data(/.*)?
568 xdm_var_run_t
571 - Set files with the xdm_var_run_t type, if you want to store the xdm
573 files under the /run or /var/run directory.
574 Paths:
577 /etc/kde[34]?/kdm/backgroundrc, /var/run/[kgm]dm(/.*)?,
578 /var/run/gdm(3)?.pid, /var/run/gdm(3)?(/.*)?,
579 /usr/lib/qt-.*/etc/settings(/.*)?, /var/run/slim.*,
580 /var/run/lxdm(/.*)?, /var/run/sddm(/.*)?, /var/run/xauth(/.*)?,
581 /var/run/xdmctl(/.*)?, /var/run/lightdm(/.*)?, /var/run/sys‐
582 temd/multi-session-x(/.*)?, /var/run/xdm.pid, /var/run/lxdm.pid,
583 /var/run/lxdm.auth, /var/run/gdm_socket
584 Note: File context can be temporarily modified with the chcon command.
587 If you want to permanently change the file context you need to use the
588 semanage fcontext command. This will modify the SELinux labeling data‐
589 base. You will need to use restorecon to apply the labels.
590
593 semanage fcontext can also be used to manipulate default file context
594 mappings.
595 semanage permissive can also be used to manipulate whether or not a
597 process type is permissive.
598 semanage module can also be used to enable/disable/install/remove pol‐
600 icy modules.
601 semanage port can also be used to manipulate the port definitions
603 semanage boolean can also be used to manipulate the booleans
605 system-config-selinux is a GUI tool available to customize SELinux pol‐
608 icy settings.
609
612 This manual page was auto-generated using sepolicy manpage .
613
616 selinux(8), xdm(8), semanage(8), restorecon(8), chcon(1), sepolicy(8),
617 setsebool(8), xdm_unconfined_selinux(8), xdm_unconfined_selinux(8)
618xdm 23-10-20 xdm_selinux(8)