1xdm_selinux(8) SELinux Policy xdm xdm_selinux(8)
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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 xdm_exec_t file type.
24 The default entrypoint paths for the xdm_t domain are the following:
26 /usr/s?bin/nodm, /usr/s?bin/gdm(3)?, /usr/s?bin/lightdm*,
28 /usr/s?bin/[mxgkw]dm, /usr/s?bin/gdm-binary, /usr/s?bin/lxdm(-binary)?,
29 /usr/X11R6/bin/[xgkw]dm, /usr/bin/razor-lightdm-.*, /usr/bin/sddm,
30 /usr/bin/slim, /usr/bin/gpe-dm, /opt/kde3/bin/kdm, /usr/sbin/mdm-
31 binary, /usr/bin/sddm-greeter, /etc/rc.d/init.d/x11-common,
32 /usr/libexec/gdm-disable-wayland
33
35 SELinux defines process types (domains) for each process running on the
36 system
37 You can see the context of a process using the -Z option to ps
39 Policy governs the access confined processes have to files. SELinux
41 xdm policy is very flexible allowing users to setup their xdm processes
42 in as secure a method as possible.
43 The following process types are defined for xdm:
45 xdm_t, xdm_unconfined_t
47 Note: semanage permissive -a xdm_t can be used to make the process type
49 xdm_t permissive. SELinux does not deny access to permissive process
50 types, but the AVC (SELinux denials) messages are still generated.
51
54 SELinux policy is customizable based on least access required. xdm
55 policy is extremely flexible and has several booleans that allow you to
56 manipulate the policy and run xdm with the tightest access possible.
57 If you want to allows xdm_t to bind on vnc_port_t(5910), you must turn
61 on the xdm_bind_vnc_tcp_port boolean. Disabled by default.
62 setsebool -P xdm_bind_vnc_tcp_port 1
64 If you want to allow the graphical login program to create, read,
68 write, and delete files in the /boot director and DOS filesystem, you
69 must turn on the xdm_manage_bootloader boolean. Enabled by default.
70 setsebool -P xdm_manage_bootloader 1
72 If you want to allow the graphical login program to login directly as
76 sysadm_r:sysadm_t, you must turn on the xdm_sysadm_login boolean. Dis‐
77 abled by default.
78 setsebool -P xdm_sysadm_login 1
80 If you want to deny user domains applications to map a memory region as
84 both executable and writable, this is dangerous and the executable
85 should be reported in bugzilla, you must turn on the deny_execmem bool‐
86 ean. Enabled by default.
87 setsebool -P deny_execmem 1
89 If you want to deny any process from ptracing or debugging any other
93 processes, you must turn on the deny_ptrace boolean. Enabled by
94 default.
95 setsebool -P deny_ptrace 1
97 If you want to allow all domains to execute in fips_mode, you must turn
101 on the fips_mode boolean. Enabled by default.
102 setsebool -P fips_mode 1
104 If you want to allow confined applications to run with kerberos, you
108 must turn on the kerberos_enabled boolean. Disabled by default.
109 setsebool -P kerberos_enabled 1
111 If you want to allow system to run with NIS, you must turn on the
115 nis_enabled boolean. Disabled by default.
116 setsebool -P nis_enabled 1
118 If you want to enable polyinstantiated directory support, you must turn
122 on the polyinstantiation_enabled boolean. Disabled by default.
123 setsebool -P polyinstantiation_enabled 1
125 If you want to allow unconfined executables to make their stack exe‐
129 cutable. This should never, ever be necessary. Probably indicates a
130 badly coded executable, but could indicate an attack. This executable
131 should be reported in bugzilla, you must turn on the selinuxuser_exec‐
132 stack boolean. Disabled by default.
133 setsebool -P selinuxuser_execstack 1
135 If you want to support ecryptfs home directories, you must turn on the
139 use_ecryptfs_home_dirs boolean. Disabled by default.
140 setsebool -P use_ecryptfs_home_dirs 1
142 If you want to support fusefs home directories, you must turn on the
146 use_fusefs_home_dirs boolean. Disabled by default.
147 setsebool -P use_fusefs_home_dirs 1
149 If you want to support NFS home directories, you must turn on the
153 use_nfs_home_dirs boolean. Enabled by default.
154 setsebool -P use_nfs_home_dirs 1
156 If you want to support SAMBA home directories, you must turn on the
160 use_samba_home_dirs boolean. Disabled by default.
161 setsebool -P use_samba_home_dirs 1
163
167 SELinux defines port types to represent TCP and UDP ports.
168 You can see the types associated with a port by using the following
170 command:
171 semanage port -l
173 Policy governs the access confined processes have to these ports.
176 SELinux xdm policy is very flexible allowing users to setup their xdm
177 processes in as secure a method as possible.
178 The following port types are defined for xdm:
180 xdmcp_port_t
183 Default Defined Ports:
187 tcp 177
188 udp 177
189
191 The SELinux process type xdm_t can manage files labeled with the fol‐
192 lowing file types. The paths listed are the default paths for these
193 file types. Note the processes UID still need to have DAC permissions.
194 anon_inodefs_t
196 auth_cache_t
199 /var/cache/coolkey(/.*)?
201 auth_home_t
203 /root/.yubico(/.*)?
205 /root/.config/Yubico(/.*)?
206 /root/.google_authenticator
207 /root/.google_authenticator~
208 /home/[^/]+/.yubico(/.*)?
209 /home/[^/]+/.config/Yubico(/.*)?
210 /home/[^/]+/.google_authenticator
211 /home/[^/]+/.google_authenticator~
212 cgroup_t
214 /sys/fs/cgroup
216 cifs_t
218 dosfs_t
221 faillog_t
224 /var/log/btmp.*
226 /var/log/faillog.*
227 /var/log/tallylog.*
228 /var/run/faillock(/.*)?
229 fusefs_t
231 /var/run/user/[^/]*/gvfs
233 initrc_var_run_t
235 /var/run/utmp
237 /var/run/random-seed
238 /var/run/runlevel.dir
239 /var/run/setmixer_flag
240 lastlog_t
242 /var/log/lastlog.*
244 nfs_t
246 pam_var_console_t
249 /var/run/console(/.*)?
251 pam_var_run_t
253 /var/(db|adm)/sudo(/.*)?
255 /var/lib/sudo(/.*)?
256 /var/run/sudo(/.*)?
257 /var/run/motd.d(/.*)?
258 /var/run/pam_ssh(/.*)?
259 /var/run/sepermit(/.*)?
260 /var/run/pam_mount(/.*)?
261 /var/run/pam_timestamp(/.*)?
262 /var/run/motd
263 security_t
265 /selinux
267 sysfs_t
269 /sys(/.*)?
271 systemd_passwd_var_run_t
273 /var/run/systemd/ask-password(/.*)?
275 /var/run/systemd/ask-password-block(/.*)?
276 var_auth_t
278 /var/ace(/.*)?
280 /var/rsa(/.*)?
281 /var/lib/abl(/.*)?
282 /var/lib/rsa(/.*)?
283 /var/lib/pam_ssh(/.*)?
284 /var/lib/pam_shield(/.*)?
285 /var/opt/quest/vas/vasd(/.*)?
286 /var/lib/google-authenticator(/.*)?
287 wtmp_t
289 /var/log/wtmp.*
291 xdm_lock_t
293 xdm_log_t
296 /var/log/[mkwx]dm.log.*
298 /var/log/mdm(/.*)?
299 /var/log/lxdm.log.*
300 /var/log/slim.log.*
301 xdm_spool_t
303 /var/spool/[mg]dm(/.*)?
305 xdm_tmpfs_t
307 xdm_var_lib_t
310 /var/lib/[mxkwg]dm(/.*)?
312 /var/cache/[mg]dm(/.*)?
313 /var/lib/gdm(3)?(/.*)?
314 /var/lib/lxdm(/.*)?
315 /var/lib/sddm(/.*)?
316 /var/lib/lightdm(/.*)?
317 /var/cache/lightdm(/.*)?
318 /var/lib/lightdm-data(/.*)?
319 xdm_var_run_t
321 /etc/kde[34]?/kdm/backgroundrc
323 /var/run/[kgm]dm(/.*)?
324 /var/run/gdm(3)?.pid
325 /var/run/gdm(3)?(/.*)?
326 /usr/lib/qt-.*/etc/settings(/.*)?
327 /var/run/slim.*
328 /var/run/lxdm(/.*)?
329 /var/run/sddm(/.*)?
330 /var/run/xauth(/.*)?
331 /var/run/xdmctl(/.*)?
332 /var/run/lightdm(/.*)?
333 /var/run/systemd/multi-session-x(/.*)?
334 /var/run/xdm.pid
335 /var/run/lxdm.pid
336 /var/run/lxdm.auth
337 /var/run/gdm_socket
338 xkb_var_lib_t
340 /var/lib/xkb(/.*)?
342 /usr/X11R6/lib/X11/xkb/.*
343 /usr/X11R6/lib/X11/xkb
344 xserver_log_t
346 /var/[xgkw]dm(/.*)?
348 /usr/var/[xgkw]dm(/.*)?
349 /var/log/gdm(3)?(/.*)?
350 /var/log/Xorg.*
351 /var/log/XFree86.*
352 /var/log/lightdm(/.*)?
353 /var/log/nvidia-installer.log.*
354
357 SELinux requires files to have an extended attribute to define the file
358 type.
359 You can see the context of a file using the -Z option to ls
361 Policy governs the access confined processes have to these files.
363 SELinux xdm policy is very flexible allowing users to setup their xdm
364 processes in as secure a method as possible.
365 EQUIVALENCE DIRECTORIES
367 xdm policy stores data with multiple different file context types under
370 the /var/lib/lightdm directory. If you would like to store the data in
371 a different directory you can use the semanage command to create an
372 equivalence mapping. If you wanted to store this data under the /srv
373 directory you would execute the following command:
374 semanage fcontext -a -e /var/lib/lightdm /srv/lightdm
376 restorecon -R -v /srv/lightdm
377 xdm policy stores data with multiple different file context types under
379 the /var/run/gdm(3)? directory. If you would like to store the data in
380 a different directory you can use the semanage command to create an
381 equivalence mapping. If you wanted to store this data under the /srv
382 directory you would execute the following command:
383 semanage fcontext -a -e /var/run/gdm(3)? /srv/gdm(3)?
385 restorecon -R -v /srv/gdm(3)?
386 xdm policy stores data with multiple different file context types under
388 the /var/run/lxdm directory. If you would like to store the data in a
389 different directory you can use the semanage command to create an
390 equivalence mapping. If you wanted to store this data under the /srv
391 directory you would execute the following command:
392 semanage fcontext -a -e /var/run/lxdm /srv/lxdm
394 restorecon -R -v /srv/lxdm
395 STANDARD FILE CONTEXT
397 SELinux defines the file context types for the xdm, if you wanted to
399 store files with these types in a diffent paths, you need to execute
400 the semanage command to sepecify alternate labeling and then use
401 restorecon to put the labels on disk.
402 semanage fcontext -a -t xdm_log_t '/srv/myxdm_content(/.*)?'
404 restorecon -R -v /srv/myxdm_content
405 Note: SELinux often uses regular expressions to specify labels that
407 match multiple files.
408 The following file types are defined for xdm:
410 xdm_etc_t
414 - Set files with the xdm_etc_t type, if you want to store xdm files in
416 the /etc directories.
417 xdm_exec_t
421 - Set files with the xdm_exec_t type, if you want to transition an exe‐
423 cutable to the xdm_t domain.
424 Paths:
427 /usr/s?bin/nodm, /usr/s?bin/gdm(3)?, /usr/s?bin/lightdm*,
428 /usr/s?bin/[mxgkw]dm, /usr/s?bin/gdm-binary,
429 /usr/s?bin/lxdm(-binary)?, /usr/X11R6/bin/[xgkw]dm,
430 /usr/bin/razor-lightdm-.*, /usr/bin/sddm, /usr/bin/slim,
431 /usr/bin/gpe-dm, /opt/kde3/bin/kdm, /usr/sbin/mdm-binary,
432 /usr/bin/sddm-greeter, /etc/rc.d/init.d/x11-common,
433 /usr/libexec/gdm-disable-wayland
434 xdm_home_t
437 - Set files with the xdm_home_t type, if you want to store xdm files in
439 the users home directory.
440 Paths:
443 /root/.dmrc.*, /root/.wayland-errors.*, /root/.xsession-errors.*,
444 /home/[^/]+/.dmrc.*, /home/[^/]+/.cache/gdm(/.*)?,
445 /home/[^/]+/.wayland-errors.*, /home/[^/]+/.xsession-errors.*,
446 /home/[^/]+/.local/share/xorg(/.*)?
447 xdm_lock_t
450 - Set files with the xdm_lock_t type, if you want to treat the files as
452 xdm lock data, stored under the /var/lock directory
453 xdm_log_t
457 - Set files with the xdm_log_t type, if you want to treat the data as
459 xdm log data, usually stored under the /var/log directory.
460 Paths:
463 /var/log/[mkwx]dm.log.*, /var/log/mdm(/.*)?, /var/log/lxdm.log.*,
464 /var/log/slim.log.*
465 xdm_rw_etc_t
468 - Set files with the xdm_rw_etc_t type, if you want to store xdm rw
470 files in the /etc directories.
471 Paths:
474 /etc/X11/wdm(/.*)?, /etc/opt/VirtualGL(/.*)?
475 xdm_spool_t
478 - Set files with the xdm_spool_t type, if you want to store the xdm
480 files under the /var/spool directory.
481 xdm_tmpfs_t
485 - Set files with the xdm_tmpfs_t type, if you want to store xdm files
487 on a tmpfs file system.
488 xdm_unconfined_exec_t
492 - Set files with the xdm_unconfined_exec_t type, if you want to transi‐
494 tion an executable to the xdm_unconfined_t domain.
495 Paths:
498 /etc/[mg]dm/Init(/.*)?, /etc/[mg]dm/PostLogin(/.*)?,
499 /etc/[mg]dm/PreSession(/.*)?, /etc/[mg]dm/PostSession(/.*)?
500 xdm_unit_file_t
503 - Set files with the xdm_unit_file_t type, if you want to treat the
505 files as xdm unit content.
506 xdm_var_lib_t
510 - Set files with the xdm_var_lib_t type, if you want to store the xdm
512 files under the /var/lib directory.
513 Paths:
516 /var/lib/[mxkwg]dm(/.*)?, /var/cache/[mg]dm(/.*)?,
517 /var/lib/gdm(3)?(/.*)?, /var/lib/lxdm(/.*)?, /var/lib/sddm(/.*)?,
518 /var/lib/lightdm(/.*)?, /var/cache/lightdm(/.*)?,
519 /var/lib/lightdm-data(/.*)?
520 xdm_var_run_t
523 - Set files with the xdm_var_run_t type, if you want to store the xdm
525 files under the /run or /var/run directory.
526 Paths:
529 /etc/kde[34]?/kdm/backgroundrc, /var/run/[kgm]dm(/.*)?,
530 /var/run/gdm(3)?.pid, /var/run/gdm(3)?(/.*)?,
531 /usr/lib/qt-.*/etc/settings(/.*)?, /var/run/slim.*,
532 /var/run/lxdm(/.*)?, /var/run/sddm(/.*)?, /var/run/xauth(/.*)?,
533 /var/run/xdmctl(/.*)?, /var/run/lightdm(/.*)?, /var/run/sys‐
534 temd/multi-session-x(/.*)?, /var/run/xdm.pid, /var/run/lxdm.pid,
535 /var/run/lxdm.auth, /var/run/gdm_socket
536 Note: File context can be temporarily modified with the chcon command.
539 If you want to permanently change the file context you need to use the
540 semanage fcontext command. This will modify the SELinux labeling data‐
541 base. You will need to use restorecon to apply the labels.
542
545 semanage fcontext can also be used to manipulate default file context
546 mappings.
547 semanage permissive can also be used to manipulate whether or not a
549 process type is permissive.
550 semanage module can also be used to enable/disable/install/remove pol‐
552 icy modules.
553 semanage port can also be used to manipulate the port definitions
555 semanage boolean can also be used to manipulate the booleans
557 system-config-selinux is a GUI tool available to customize SELinux pol‐
560 icy settings.
561
564 This manual page was auto-generated using sepolicy manpage .
565
568 selinux(8), xdm(8), semanage(8), restorecon(8), chcon(1), sepolicy(8),
569 setsebool(8), xdm_unconfined_selinux(8), xdm_unconfined_selinux(8)
570xdm 21-03-26 xdm_selinux(8)