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-bi‐
31 nary, /usr/bin/sddm-greeter, /etc/rc.d/init.d/x11-common,
32 /usr/libexec/gdm-runtime-config, /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 de‐
94 fault.
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. Enabled 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. Enabled 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. Disabled 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 auth_cache_t
196 /var/cache/coolkey(/.*)?
198 auth_home_t
200 /root/.yubico(/.*)?
202 /root/.config/Yubico(/.*)?
203 /root/.google_authenticator
204 /root/.google_authenticator~
205 /home/[^/]+/.yubico(/.*)?
206 /home/[^/]+/.config/Yubico(/.*)?
207 /home/[^/]+/.google_authenticator
208 /home/[^/]+/.google_authenticator~
209 cifs_t
211 dosfs_t
214 faillog_t
217 /var/log/btmp.*
219 /var/log/faillog.*
220 /var/log/tallylog.*
221 /var/run/faillock(/.*)?
222 fusefs_t
224 /var/run/user/[^/]*/gvfs
226 initrc_var_run_t
228 /var/run/utmp
230 /var/run/random-seed
231 /var/run/runlevel.dir
232 /var/run/setmixer_flag
233 krb5_host_rcache_t
235 /var/tmp/krb5_0.rcache2
237 /var/cache/krb5rcache(/.*)?
238 /var/tmp/nfs_0
239 /var/tmp/DNS_25
240 /var/tmp/host_0
241 /var/tmp/imap_0
242 /var/tmp/HTTP_23
243 /var/tmp/HTTP_48
244 /var/tmp/ldap_55
245 /var/tmp/ldap_487
246 /var/tmp/ldapmap1_0
247 lastlog_t
249 /var/log/lastlog.*
251 nfs_t
253 pam_var_console_t
256 /var/run/console(/.*)?
258 pam_var_run_t
260 /var/(db|adm)/sudo(/.*)?
262 /var/lib/sudo(/.*)?
263 /var/run/sudo(/.*)?
264 /var/run/pam_ssh(/.*)?
265 /var/run/sepermit(/.*)?
266 /var/run/pam_mount(/.*)?
267 /var/run/pam_timestamp(/.*)?
268 security_t
270 /selinux
272 sysfs_t
274 /sys(/.*)?
276 systemd_passwd_var_run_t
278 /var/run/systemd/ask-password(/.*)?
280 /var/run/systemd/ask-password-block(/.*)?
281 user_tmp_t
283 /dev/shm/mono.*
285 /var/run/user(/.*)?
286 /tmp/.ICE-unix(/.*)?
287 /tmp/.X11-unix(/.*)?
288 /dev/shm/pulse-shm.*
289 /tmp/.X0-lock
290 /tmp/hsperfdata_root
291 /var/tmp/hsperfdata_root
292 /home/[^/]+/tmp
293 /home/[^/]+/.tmp
294 /tmp/gconfd-[^/]+
295 user_tmp_type
297 all user tmp files
299 var_auth_t
301 /var/ace(/.*)?
303 /var/rsa(/.*)?
304 /var/lib/abl(/.*)?
305 /var/lib/rsa(/.*)?
306 /var/lib/pam_ssh(/.*)?
307 /var/lib/pam_shield(/.*)?
308 /var/opt/quest/vas/vasd(/.*)?
309 /var/lib/google-authenticator(/.*)?
310 wtmp_t
312 /var/log/wtmp.*
314 xdm_lock_t
316 xdm_log_t
319 /var/log/[mkwx]dm.log.*
321 /var/log/mdm(/.*)?
322 /var/log/lxdm.log.*
323 /var/log/slim.log.*
324 xdm_spool_t
326 /var/spool/[mg]dm(/.*)?
328 xdm_tmpfs_t
330 xdm_var_lib_t
333 /var/lib/[mxkwg]dm(/.*)?
335 /var/cache/[mg]dm(/.*)?
336 /var/lib/gdm(3)?(/.*)?
337 /var/lib/lxdm(/.*)?
338 /var/lib/sddm(/.*)?
339 /var/lib/lightdm(/.*)?
340 /var/cache/lightdm(/.*)?
341 /var/lib/lightdm-data(/.*)?
342 xdm_var_run_t
344 /etc/kde[34]?/kdm/backgroundrc
346 /var/run/[kgm]dm(/.*)?
347 /var/run/gdm(3)?.pid
348 /var/run/gdm(3)?(/.*)?
349 /usr/lib/qt-.*/etc/settings(/.*)?
350 /var/run/slim.*
351 /var/run/lxdm(/.*)?
352 /var/run/sddm(/.*)?
353 /var/run/xauth(/.*)?
354 /var/run/xdmctl(/.*)?
355 /var/run/lightdm(/.*)?
356 /var/run/systemd/multi-session-x(/.*)?
357 /var/run/xdm.pid
358 /var/run/lxdm.pid
359 /var/run/lxdm.auth
360 /var/run/gdm_socket
361 xkb_var_lib_t
363 /var/lib/xkb(/.*)?
365 /usr/X11R6/lib/X11/xkb/.*
366 /usr/X11R6/lib/X11/xkb
367 xserver_log_t
369 /var/[xgkw]dm(/.*)?
371 /usr/var/[xgkw]dm(/.*)?
372 /var/log/gdm(3)?(/.*)?
373 /var/log/Xorg.*
374 /var/log/XFree86.*
375 /var/log/lightdm(/.*)?
376 /var/log/nvidia-installer.log.*
377 xserver_tmpfs_t
379
383 SELinux requires files to have an extended attribute to define the file
384 type.
385 You can see the context of a file using the -Z option to ls
387 Policy governs the access confined processes have to these files.
389 SELinux xdm policy is very flexible allowing users to setup their xdm
390 processes in as secure a method as possible.
391 EQUIVALENCE DIRECTORIES
393 xdm policy stores data with multiple different file context types under
396 the /var/lib/lightdm directory. If you would like to store the data in
397 a different directory you can use the semanage command to create an
398 equivalence mapping. If you wanted to store this data under the /srv
399 directory you would execute the following command:
400 semanage fcontext -a -e /var/lib/lightdm /srv/lightdm
402 restorecon -R -v /srv/lightdm
403 xdm policy stores data with multiple different file context types under
405 the /var/run/gdm(3)? directory. If you would like to store the data in
406 a different directory you can use the semanage command to create an
407 equivalence mapping. If you wanted to store this data under the /srv
408 directory you would execute the following command:
409 semanage fcontext -a -e /var/run/gdm(3)? /srv/gdm(3)?
411 restorecon -R -v /srv/gdm(3)?
412 xdm policy stores data with multiple different file context types under
414 the /var/run/lxdm directory. If you would like to store the data in a
415 different directory you can use the semanage command to create an
416 equivalence mapping. If you wanted to store this data under the /srv
417 directory you would execute the following command:
418 semanage fcontext -a -e /var/run/lxdm /srv/lxdm
420 restorecon -R -v /srv/lxdm
421 STANDARD FILE CONTEXT
423 SELinux defines the file context types for the xdm, if you wanted to
425 store files with these types in a diffent paths, you need to execute
426 the semanage command to specify alternate labeling and then use re‐
427 storecon to put the labels on disk.
428 semanage fcontext -a -t xdm_log_t '/srv/myxdm_content(/.*)?'
430 restorecon -R -v /srv/myxdm_content
431 Note: SELinux often uses regular expressions to specify labels that
433 match multiple files.
434 The following file types are defined for xdm:
436 xdm_etc_t
440 - Set files with the xdm_etc_t type, if you want to store xdm files in
442 the /etc directories.
443 xdm_exec_t
447 - Set files with the xdm_exec_t type, if you want to transition an exe‐
449 cutable to the xdm_t domain.
450 Paths:
453 /usr/s?bin/nodm, /usr/s?bin/gdm(3)?, /usr/s?bin/lightdm*,
454 /usr/s?bin/[mxgkw]dm, /usr/s?bin/gdm-binary, /usr/s?bin/lxdm(-bi‐
455 nary)?, /usr/X11R6/bin/[xgkw]dm, /usr/bin/razor-lightdm-.*,
456 /usr/bin/sddm, /usr/bin/slim, /usr/bin/gpe-dm, /opt/kde3/bin/kdm,
457 /usr/sbin/mdm-binary, /usr/bin/sddm-greeter,
458 /etc/rc.d/init.d/x11-common, /usr/libexec/gdm-runtime-config,
459 /usr/libexec/gdm-disable-wayland
460 xdm_home_t
463 - Set files with the xdm_home_t type, if you want to store xdm files in
465 the users home directory.
466 Paths:
469 /root/.dmrc.*, /root/.wayland-errors.*, /root/.xsession-errors.*,
470 /home/[^/]+/.dmrc.*, /home/[^/]+/.cache/gdm(/.*)?,
471 /home/[^/]+/.wayland-errors.*, /home/[^/]+/.xsession-errors.*,
472 /home/[^/]+/.local/share/xorg(/.*)?
473 xdm_lock_t
476 - Set files with the xdm_lock_t type, if you want to treat the files as
478 xdm lock data, stored under the /var/lock directory
479 xdm_log_t
483 - Set files with the xdm_log_t type, if you want to treat the data as
485 xdm log data, usually stored under the /var/log directory.
486 Paths:
489 /var/log/[mkwx]dm.log.*, /var/log/mdm(/.*)?, /var/log/lxdm.log.*,
490 /var/log/slim.log.*
491 xdm_rw_etc_t
494 - Set files with the xdm_rw_etc_t type, if you want to store xdm rw
496 files in the /etc directories.
497 Paths:
500 /etc/X11/wdm(/.*)?, /etc/opt/VirtualGL(/.*)?
501 xdm_spool_t
504 - Set files with the xdm_spool_t type, if you want to store the xdm
506 files under the /var/spool directory.
507 xdm_tmpfs_t
511 - Set files with the xdm_tmpfs_t type, if you want to store xdm files
513 on a tmpfs file system.
514 xdm_unconfined_exec_t
518 - Set files with the xdm_unconfined_exec_t type, if you want to transi‐
520 tion an executable to the xdm_unconfined_t domain.
521 Paths:
524 /etc/[mg]dm/Init(/.*)?, /etc/[mg]dm/PostLogin(/.*)?,
525 /etc/[mg]dm/PreSession(/.*)?, /etc/[mg]dm/PostSession(/.*)?
526 xdm_unit_file_t
529 - Set files with the xdm_unit_file_t type, if you want to treat the
531 files as xdm unit content.
532 xdm_var_lib_t
536 - Set files with the xdm_var_lib_t type, if you want to store the xdm
538 files under the /var/lib directory.
539 Paths:
542 /var/lib/[mxkwg]dm(/.*)?, /var/cache/[mg]dm(/.*)?,
543 /var/lib/gdm(3)?(/.*)?, /var/lib/lxdm(/.*)?, /var/lib/sddm(/.*)?,
544 /var/lib/lightdm(/.*)?, /var/cache/lightdm(/.*)?,
545 /var/lib/lightdm-data(/.*)?
546 xdm_var_run_t
549 - Set files with the xdm_var_run_t type, if you want to store the xdm
551 files under the /run or /var/run directory.
552 Paths:
555 /etc/kde[34]?/kdm/backgroundrc, /var/run/[kgm]dm(/.*)?,
556 /var/run/gdm(3)?.pid, /var/run/gdm(3)?(/.*)?,
557 /usr/lib/qt-.*/etc/settings(/.*)?, /var/run/slim.*,
558 /var/run/lxdm(/.*)?, /var/run/sddm(/.*)?, /var/run/xauth(/.*)?,
559 /var/run/xdmctl(/.*)?, /var/run/lightdm(/.*)?, /var/run/sys‐
560 temd/multi-session-x(/.*)?, /var/run/xdm.pid, /var/run/lxdm.pid,
561 /var/run/lxdm.auth, /var/run/gdm_socket
562 Note: File context can be temporarily modified with the chcon command.
565 If you want to permanently change the file context you need to use the
566 semanage fcontext command. This will modify the SELinux labeling data‐
567 base. You will need to use restorecon to apply the labels.
568
571 semanage fcontext can also be used to manipulate default file context
572 mappings.
573 semanage permissive can also be used to manipulate whether or not a
575 process type is permissive.
576 semanage module can also be used to enable/disable/install/remove pol‐
578 icy modules.
579 semanage port can also be used to manipulate the port definitions
581 semanage boolean can also be used to manipulate the booleans
583 system-config-selinux is a GUI tool available to customize SELinux pol‐
586 icy settings.
587
590 This manual page was auto-generated using sepolicy manpage .
591
594 selinux(8), xdm(8), semanage(8), restorecon(8), chcon(1), sepolicy(8),
595 setsebool(8), xdm_unconfined_selinux(8), xdm_unconfined_selinux(8)
596xdm 21-11-19 xdm_selinux(8)