1xdm_selinux(8) SELinux Policy xdm xdm_selinux(8)
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6 xdm_selinux - Security Enhanced Linux Policy for the xdm processes
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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/.google_authenticator
206 /root/.google_authenticator~
207 /home/[^/]+/.yubico(/.*)?
208 /home/[^/]+/.google_authenticator
209 /home/[^/]+/.google_authenticator~
210 cgroup_t
212 /sys/fs/cgroup
214 cifs_t
216 dosfs_t
219 faillog_t
222 /var/log/btmp.*
224 /var/log/faillog.*
225 /var/log/tallylog.*
226 /var/run/faillock(/.*)?
227 fusefs_t
229 /var/run/user/[^/]*/gvfs
231 initrc_var_run_t
233 /var/run/utmp
235 /var/run/random-seed
236 /var/run/runlevel.dir
237 /var/run/setmixer_flag
238 kdbusfs_t
240 lastlog_t
243 /var/log/lastlog.*
245 nfs_t
247 pam_var_console_t
250 /var/run/console(/.*)?
252 pam_var_run_t
254 /var/(db|adm)/sudo(/.*)?
256 /var/lib/sudo(/.*)?
257 /var/run/sudo(/.*)?
258 /var/run/motd.d(/.*)?
259 /var/run/pam_ssh(/.*)?
260 /var/run/sepermit(/.*)?
261 /var/run/pam_mount(/.*)?
262 /var/run/pam_timestamp(/.*)?
263 /var/run/motd
264 security_t
266 /selinux
268 sysfs_t
270 /sys(/.*)?
272 systemd_passwd_var_run_t
274 /var/run/systemd/ask-password(/.*)?
276 /var/run/systemd/ask-password-block(/.*)?
277 var_auth_t
279 /var/ace(/.*)?
281 /var/rsa(/.*)?
282 /var/lib/abl(/.*)?
283 /var/lib/rsa(/.*)?
284 /var/lib/pam_ssh(/.*)?
285 /var/lib/pam_shield(/.*)?
286 /var/opt/quest/vas/vasd(/.*)?
287 /var/lib/google-authenticator(/.*)?
288 wtmp_t
290 /var/log/wtmp.*
292 xdm_lock_t
294 xdm_log_t
297 /var/log/[mkwx]dm.log.*
299 /var/log/mdm(/.*)?
300 /var/log/lxdm.log.*
301 /var/log/slim.log.*
302 xdm_spool_t
304 /var/spool/[mg]dm(/.*)?
306 xdm_tmpfs_t
308 xdm_var_lib_t
311 /var/lib/[mxkwg]dm(/.*)?
313 /var/cache/[mg]dm(/.*)?
314 /var/lib/gdm(3)?(/.*)?
315 /var/lib/lxdm(/.*)?
316 /var/lib/sddm(/.*)?
317 /var/lib/lightdm(/.*)?
318 /var/cache/lightdm(/.*)?
319 /var/lib/lightdm-data(/.*)?
320 xdm_var_run_t
322 /etc/kde[34]?/kdm/backgroundrc
324 /var/run/[kgm]dm(/.*)?
325 /var/run/gdm(3)?.pid
326 /var/run/gdm(3)?(/.*)?
327 /usr/lib/qt-.*/etc/settings(/.*)?
328 /var/run/slim.*
329 /var/run/lxdm(/.*)?
330 /var/run/sddm(/.*)?
331 /var/run/xauth(/.*)?
332 /var/run/xdmctl(/.*)?
333 /var/run/lightdm(/.*)?
334 /var/run/systemd/multi-session-x(/.*)?
335 /var/run/xdm.pid
336 /var/run/lxdm.pid
337 /var/run/lxdm.auth
338 /var/run/gdm_socket
339 xkb_var_lib_t
341 /var/lib/xkb(/.*)?
343 /usr/X11R6/lib/X11/xkb/.*
344 /usr/X11R6/lib/X11/xkb
345 xserver_log_t
347 /var/[xgkw]dm(/.*)?
349 /usr/var/[xgkw]dm(/.*)?
350 /var/log/gdm(3)?(/.*)?
351 /var/log/Xorg.*
352 /var/log/XFree86.*
353 /var/log/lightdm(/.*)?
354 /var/log/nvidia-installer.log.*
355
358 SELinux requires files to have an extended attribute to define the file
359 type.
360 You can see the context of a file using the -Z option to ls
362 Policy governs the access confined processes have to these files.
364 SELinux xdm policy is very flexible allowing users to setup their xdm
365 processes in as secure a method as possible.
366 EQUIVALENCE DIRECTORIES
368 xdm policy stores data with multiple different file context types under
371 the /var/lib/lightdm directory. If you would like to store the data in
372 a different directory you can use the semanage command to create an
373 equivalence mapping. If you wanted to store this data under the /srv
374 directory you would execute the following command:
375 semanage fcontext -a -e /var/lib/lightdm /srv/lightdm
377 restorecon -R -v /srv/lightdm
378 xdm policy stores data with multiple different file context types under
380 the /var/run/gdm(3)? directory. If you would like to store the data in
381 a different directory you can use the semanage command to create an
382 equivalence mapping. If you wanted to store this data under the /srv
383 directory you would execute the following command:
384 semanage fcontext -a -e /var/run/gdm(3)? /srv/gdm(3)?
386 restorecon -R -v /srv/gdm(3)?
387 xdm policy stores data with multiple different file context types under
389 the /var/run/lxdm directory. If you would like to store the data in a
390 different directory you can use the semanage command to create an
391 equivalence mapping. If you wanted to store this data under the /srv
392 directory you would execute the following command:
393 semanage fcontext -a -e /var/run/lxdm /srv/lxdm
395 restorecon -R -v /srv/lxdm
396 STANDARD FILE CONTEXT
398 SELinux defines the file context types for the xdm, if you wanted to
400 store files with these types in a diffent paths, you need to execute
401 the semanage command to sepecify alternate labeling and then use
402 restorecon to put the labels on disk.
403 semanage fcontext -a -t xdm_log_t '/srv/myxdm_content(/.*)?'
405 restorecon -R -v /srv/myxdm_content
406 Note: SELinux often uses regular expressions to specify labels that
408 match multiple files.
409 The following file types are defined for xdm:
411 xdm_etc_t
415 - Set files with the xdm_etc_t type, if you want to store xdm files in
417 the /etc directories.
418 xdm_exec_t
422 - Set files with the xdm_exec_t type, if you want to transition an exe‐
424 cutable to the xdm_t domain.
425 Paths:
428 /usr/s?bin/nodm, /usr/s?bin/gdm(3)?, /usr/s?bin/lightdm*,
429 /usr/s?bin/[mxgkw]dm, /usr/s?bin/gdm-binary,
430 /usr/s?bin/lxdm(-binary)?, /usr/X11R6/bin/[xgkw]dm,
431 /usr/bin/razor-lightdm-.*, /usr/bin/sddm, /usr/bin/slim,
432 /usr/bin/gpe-dm, /opt/kde3/bin/kdm, /usr/sbin/mdm-binary,
433 /usr/bin/sddm-greeter, /etc/rc.d/init.d/x11-common,
434 /usr/libexec/gdm-disable-wayland
435 xdm_home_t
438 - Set files with the xdm_home_t type, if you want to store xdm files in
440 the users home directory.
441 Paths:
444 /root/.dmrc.*, /root/.wayland-errors.*, /root/.xsession-errors.*,
445 /home/[^/]+/.dmrc.*, /home/[^/]+/.cache/gdm(/.*)?,
446 /home/[^/]+/.wayland-errors.*, /home/[^/]+/.xsession-errors.*,
447 /home/[^/]+/.local/share/xorg(/.*)?
448 xdm_lock_t
451 - Set files with the xdm_lock_t type, if you want to treat the files as
453 xdm lock data, stored under the /var/lock directory
454 xdm_log_t
458 - Set files with the xdm_log_t type, if you want to treat the data as
460 xdm log data, usually stored under the /var/log directory.
461 Paths:
464 /var/log/[mkwx]dm.log.*, /var/log/mdm(/.*)?, /var/log/lxdm.log.*,
465 /var/log/slim.log.*
466 xdm_rw_etc_t
469 - Set files with the xdm_rw_etc_t type, if you want to store xdm rw
471 files in the /etc directories.
472 Paths:
475 /etc/X11/wdm(/.*)?, /etc/opt/VirtualGL(/.*)?
476 xdm_spool_t
479 - Set files with the xdm_spool_t type, if you want to store the xdm
481 files under the /var/spool directory.
482 xdm_tmpfs_t
486 - Set files with the xdm_tmpfs_t type, if you want to store xdm files
488 on a tmpfs file system.
489 xdm_unconfined_exec_t
493 - Set files with the xdm_unconfined_exec_t type, if you want to transi‐
495 tion an executable to the xdm_unconfined_t domain.
496 Paths:
499 /etc/[mg]dm/Init(/.*)?, /etc/[mg]dm/PostLogin(/.*)?,
500 /etc/[mg]dm/PreSession(/.*)?, /etc/[mg]dm/PostSession(/.*)?
501 xdm_unit_file_t
504 - Set files with the xdm_unit_file_t type, if you want to treat the
506 files as xdm unit content.
507 xdm_var_lib_t
511 - Set files with the xdm_var_lib_t type, if you want to store the xdm
513 files under the /var/lib directory.
514 Paths:
517 /var/lib/[mxkwg]dm(/.*)?, /var/cache/[mg]dm(/.*)?,
518 /var/lib/gdm(3)?(/.*)?, /var/lib/lxdm(/.*)?, /var/lib/sddm(/.*)?,
519 /var/lib/lightdm(/.*)?, /var/cache/lightdm(/.*)?,
520 /var/lib/lightdm-data(/.*)?
521 xdm_var_run_t
524 - Set files with the xdm_var_run_t type, if you want to store the xdm
526 files under the /run or /var/run directory.
527 Paths:
530 /etc/kde[34]?/kdm/backgroundrc, /var/run/[kgm]dm(/.*)?,
531 /var/run/gdm(3)?.pid, /var/run/gdm(3)?(/.*)?,
532 /usr/lib/qt-.*/etc/settings(/.*)?, /var/run/slim.*,
533 /var/run/lxdm(/.*)?, /var/run/sddm(/.*)?, /var/run/xauth(/.*)?,
534 /var/run/xdmctl(/.*)?, /var/run/lightdm(/.*)?, /var/run/sys‐
535 temd/multi-session-x(/.*)?, /var/run/xdm.pid, /var/run/lxdm.pid,
536 /var/run/lxdm.auth, /var/run/gdm_socket
537 Note: File context can be temporarily modified with the chcon command.
540 If you want to permanently change the file context you need to use the
541 semanage fcontext command. This will modify the SELinux labeling data‐
542 base. You will need to use restorecon to apply the labels.
543
546 semanage fcontext can also be used to manipulate default file context
547 mappings.
548 semanage permissive can also be used to manipulate whether or not a
550 process type is permissive.
551 semanage module can also be used to enable/disable/install/remove pol‐
553 icy modules.
554 semanage port can also be used to manipulate the port definitions
556 semanage boolean can also be used to manipulate the booleans
558 system-config-selinux is a GUI tool available to customize SELinux pol‐
561 icy settings.
562
565 This manual page was auto-generated using sepolicy manpage .
566
569 selinux(8), xdm(8), semanage(8), restorecon(8), chcon(1), sepolicy(8),
570 setsebool(8), xdm_unconfined_selinux(8), xdm_unconfined_selinux(8)
571xdm 20-05-05 xdm_selinux(8)