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, user_tmp_t
24 file types.
25 The default entrypoint paths for the xdm_t domain are the following:
27 /usr/s?bin/nodm, /usr/s?bin/gdm(3)?, /usr/s?bin/lightdm*,
29 /usr/s?bin/[mxgkw]dm, /usr/s?bin/gdm-binary, /usr/s?bin/lxdm(-binary)?,
30 /usr/X11R6/bin/[xgkw]dm, /usr/bin/razor-lightdm-.*, /usr/bin/sddm,
31 /usr/bin/slim, /usr/bin/gpe-dm, /opt/kde3/bin/kdm, /usr/sbin/mdm-bi‐
32 nary, /usr/bin/sddm-greeter, /etc/rc.d/init.d/x11-common,
33 /usr/libexec/gdm-runtime-config, /usr/libexec/gdm-disable-wayland,
34 /dev/shm/mono.*, /var/run/user/[^/]+, /tmp/.ICE-unix(/.*)?,
35 /tmp/.X11-unix(/.*)?, /dev/shm/pulse-shm.*, /tmp/.X0-lock,
36 /var/run/user, /tmp/hsperfdata_root, /var/tmp/hsperfdata_root,
37 /home/[^/]+/tmp, /home/[^/]+/.tmp, /var/run/user/[0-9]+,
38 /tmp/gconfd-[^/]+
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. Enabled 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. Enabled 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 initrc_var_run_t
234 /var/run/utmp
236 /var/run/random-seed
237 /var/run/runlevel.dir
238 /var/run/setmixer_flag
239 krb5_host_rcache_t
241 /var/tmp/krb5_0.rcache2
243 /var/cache/krb5rcache(/.*)?
244 /var/tmp/nfs_0
245 /var/tmp/DNS_25
246 /var/tmp/host_0
247 /var/tmp/imap_0
248 /var/tmp/HTTP_23
249 /var/tmp/HTTP_48
250 /var/tmp/ldap_55
251 /var/tmp/ldap_487
252 /var/tmp/ldapmap1_0
253 lastlog_t
255 /var/log/lastlog.*
257 nfs_t
259 pam_var_console_t
262 /var/run/console(/.*)?
264 pam_var_run_t
266 /var/(db|adm)/sudo(/.*)?
268 /var/lib/sudo(/.*)?
269 /var/run/sudo(/.*)?
270 /var/run/pam_ssh(/.*)?
271 /var/run/sepermit(/.*)?
272 /var/run/pam_mount(/.*)?
273 /var/run/pam_timestamp(/.*)?
274 security_t
276 /selinux
278 sysfs_t
280 /sys(/.*)?
282 systemd_passwd_var_run_t
284 /var/run/systemd/ask-password(/.*)?
286 /var/run/systemd/ask-password-block(/.*)?
287 user_tmp_t
289 /dev/shm/mono.*
291 /var/run/user/[^/]+
292 /tmp/.ICE-unix(/.*)?
293 /tmp/.X11-unix(/.*)?
294 /dev/shm/pulse-shm.*
295 /tmp/.X0-lock
296 /var/run/user
297 /tmp/hsperfdata_root
298 /var/tmp/hsperfdata_root
299 /home/[^/]+/tmp
300 /home/[^/]+/.tmp
301 /var/run/user/[0-9]+
302 /tmp/gconfd-[^/]+
303 user_tmp_type
305 all user tmp files
307 var_auth_t
309 /var/ace(/.*)?
311 /var/rsa(/.*)?
312 /var/lib/abl(/.*)?
313 /var/lib/rsa(/.*)?
314 /var/lib/pam_ssh(/.*)?
315 /var/lib/pam_shield(/.*)?
316 /var/opt/quest/vas/vasd(/.*)?
317 /var/lib/google-authenticator(/.*)?
318 wtmp_t
320 /var/log/wtmp.*
322 xdm_lock_t
324 xdm_log_t
327 /var/log/[mkwx]dm.log.*
329 /var/log/mdm(/.*)?
330 /var/log/lxdm.log.*
331 /var/log/slim.log.*
332 xdm_spool_t
334 /var/spool/[mg]dm(/.*)?
336 xdm_tmpfs_t
338 xdm_var_lib_t
341 /var/lib/[mxkwg]dm(/.*)?
343 /var/cache/[mg]dm(/.*)?
344 /var/lib/gdm(3)?(/.*)?
345 /var/lib/lxdm(/.*)?
346 /var/lib/sddm(/.*)?
347 /var/lib/lightdm(/.*)?
348 /var/cache/lightdm(/.*)?
349 /var/lib/lightdm-data(/.*)?
350 xdm_var_run_t
352 /etc/kde[34]?/kdm/backgroundrc
354 /var/run/[kgm]dm(/.*)?
355 /var/run/gdm(3)?.pid
356 /var/run/gdm(3)?(/.*)?
357 /usr/lib/qt-.*/etc/settings(/.*)?
358 /var/run/slim.*
359 /var/run/lxdm(/.*)?
360 /var/run/sddm(/.*)?
361 /var/run/xauth(/.*)?
362 /var/run/xdmctl(/.*)?
363 /var/run/lightdm(/.*)?
364 /var/run/systemd/multi-session-x(/.*)?
365 /var/run/xdm.pid
366 /var/run/lxdm.pid
367 /var/run/lxdm.auth
368 /var/run/gdm_socket
369 xkb_var_lib_t
371 /var/lib/xkb(/.*)?
373 /usr/X11R6/lib/X11/xkb/.*
374 /usr/X11R6/lib/X11/xkb
375 xserver_log_t
377 /var/[xgkw]dm(/.*)?
379 /usr/var/[xgkw]dm(/.*)?
380 /var/log/gdm(3)?(/.*)?
381 /var/log/Xorg.*
382 /var/log/XFree86.*
383 /var/log/lightdm(/.*)?
384 /var/log/nvidia-installer.log.*
385 xserver_tmpfs_t
387
391 SELinux requires files to have an extended attribute to define the file
392 type.
393 You can see the context of a file using the -Z option to ls
395 Policy governs the access confined processes have to these files.
397 SELinux xdm policy is very flexible allowing users to setup their xdm
398 processes in as secure a method as possible.
399 EQUIVALENCE DIRECTORIES
401 xdm policy stores data with multiple different file context types under
404 the /var/lib/lightdm directory. If you would like to store the data in
405 a different directory you can use the semanage command to create an
406 equivalence mapping. If you wanted to store this data under the /srv
407 directory you would execute the following command:
408 semanage fcontext -a -e /var/lib/lightdm /srv/lightdm
410 restorecon -R -v /srv/lightdm
411 xdm policy stores data with multiple different file context types under
413 the /var/run/gdm(3)? directory. If you would like to store the data in
414 a different directory you can use the semanage command to create an
415 equivalence mapping. If you wanted to store this data under the /srv
416 directory you would execute the following command:
417 semanage fcontext -a -e /var/run/gdm(3)? /srv/gdm(3)?
419 restorecon -R -v /srv/gdm(3)?
420 xdm policy stores data with multiple different file context types under
422 the /var/run/lxdm directory. If you would like to store the data in a
423 different directory you can use the semanage command to create an
424 equivalence mapping. If you wanted to store this data under the /srv
425 directory you would execute the following command:
426 semanage fcontext -a -e /var/run/lxdm /srv/lxdm
428 restorecon -R -v /srv/lxdm
429 STANDARD FILE CONTEXT
431 SELinux defines the file context types for the xdm, if you wanted to
433 store files with these types in a diffent paths, you need to execute
434 the semanage command to specify alternate labeling and then use re‐
435 storecon to put the labels on disk.
436 semanage fcontext -a -t xdm_log_t '/srv/myxdm_content(/.*)?'
438 restorecon -R -v /srv/myxdm_content
439 Note: SELinux often uses regular expressions to specify labels that
441 match multiple files.
442 The following file types are defined for xdm:
444 xdm_etc_t
448 - Set files with the xdm_etc_t type, if you want to store xdm files in
450 the /etc directories.
451 xdm_exec_t
455 - Set files with the xdm_exec_t type, if you want to transition an exe‐
457 cutable to the xdm_t domain.
458 Paths:
461 /usr/s?bin/nodm, /usr/s?bin/gdm(3)?, /usr/s?bin/lightdm*,
462 /usr/s?bin/[mxgkw]dm, /usr/s?bin/gdm-binary, /usr/s?bin/lxdm(-bi‐
463 nary)?, /usr/X11R6/bin/[xgkw]dm, /usr/bin/razor-lightdm-.*,
464 /usr/bin/sddm, /usr/bin/slim, /usr/bin/gpe-dm, /opt/kde3/bin/kdm,
465 /usr/sbin/mdm-binary, /usr/bin/sddm-greeter,
466 /etc/rc.d/init.d/x11-common, /usr/libexec/gdm-runtime-config,
467 /usr/libexec/gdm-disable-wayland
468 xdm_home_t
471 - Set files with the xdm_home_t type, if you want to store xdm files in
473 the users home directory.
474 Paths:
477 /root/.dmrc.*, /root/.wayland-errors.*, /root/.xsession-errors.*,
478 /home/[^/]+/.dmrc.*, /home/[^/]+/.cache/gdm(/.*)?,
479 /home/[^/]+/.wayland-errors.*, /home/[^/]+/.xsession-errors.*,
480 /home/[^/]+/.local/share/xorg(/.*)?
481 xdm_lock_t
484 - Set files with the xdm_lock_t type, if you want to treat the files as
486 xdm lock data, stored under the /var/lock directory
487 xdm_log_t
491 - Set files with the xdm_log_t type, if you want to treat the data as
493 xdm log data, usually stored under the /var/log directory.
494 Paths:
497 /var/log/[mkwx]dm.log.*, /var/log/mdm(/.*)?, /var/log/lxdm.log.*,
498 /var/log/slim.log.*
499 xdm_rw_etc_t
502 - Set files with the xdm_rw_etc_t type, if you want to store xdm rw
504 files in the /etc directories.
505 Paths:
508 /etc/X11/wdm(/.*)?, /etc/opt/VirtualGL(/.*)?
509 xdm_spool_t
512 - Set files with the xdm_spool_t type, if you want to store the xdm
514 files under the /var/spool directory.
515 xdm_tmpfs_t
519 - Set files with the xdm_tmpfs_t type, if you want to store xdm files
521 on a tmpfs file system.
522 xdm_unconfined_exec_t
526 - Set files with the xdm_unconfined_exec_t type, if you want to transi‐
528 tion an executable to the xdm_unconfined_t domain.
529 Paths:
532 /etc/[mg]dm/Init(/.*)?, /etc/[mg]dm/PostLogin(/.*)?,
533 /etc/[mg]dm/PreSession(/.*)?, /etc/[mg]dm/PostSession(/.*)?
534 xdm_unit_file_t
537 - Set files with the xdm_unit_file_t type, if you want to treat the
539 files as xdm unit content.
540 xdm_var_lib_t
544 - Set files with the xdm_var_lib_t type, if you want to store the xdm
546 files under the /var/lib directory.
547 Paths:
550 /var/lib/[mxkwg]dm(/.*)?, /var/cache/[mg]dm(/.*)?,
551 /var/lib/gdm(3)?(/.*)?, /var/lib/lxdm(/.*)?, /var/lib/sddm(/.*)?,
552 /var/lib/lightdm(/.*)?, /var/cache/lightdm(/.*)?,
553 /var/lib/lightdm-data(/.*)?
554 xdm_var_run_t
557 - Set files with the xdm_var_run_t type, if you want to store the xdm
559 files under the /run or /var/run directory.
560 Paths:
563 /etc/kde[34]?/kdm/backgroundrc, /var/run/[kgm]dm(/.*)?,
564 /var/run/gdm(3)?.pid, /var/run/gdm(3)?(/.*)?,
565 /usr/lib/qt-.*/etc/settings(/.*)?, /var/run/slim.*,
566 /var/run/lxdm(/.*)?, /var/run/sddm(/.*)?, /var/run/xauth(/.*)?,
567 /var/run/xdmctl(/.*)?, /var/run/lightdm(/.*)?, /var/run/sys‐
568 temd/multi-session-x(/.*)?, /var/run/xdm.pid, /var/run/lxdm.pid,
569 /var/run/lxdm.auth, /var/run/gdm_socket
570 Note: File context can be temporarily modified with the chcon command.
573 If you want to permanently change the file context you need to use the
574 semanage fcontext command. This will modify the SELinux labeling data‐
575 base. You will need to use restorecon to apply the labels.
576
579 semanage fcontext can also be used to manipulate default file context
580 mappings.
581 semanage permissive can also be used to manipulate whether or not a
583 process type is permissive.
584 semanage module can also be used to enable/disable/install/remove pol‐
586 icy modules.
587 semanage port can also be used to manipulate the port definitions
589 semanage boolean can also be used to manipulate the booleans
591 system-config-selinux is a GUI tool available to customize SELinux pol‐
594 icy settings.
595
598 This manual page was auto-generated using sepolicy manpage .
599
602 selinux(8), xdm(8), semanage(8), restorecon(8), chcon(1), sepolicy(8),
603 setsebool(8), xdm_unconfined_selinux(8), xdm_unconfined_selinux(8)
604xdm 23-02-03 xdm_selinux(8)