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.
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12 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.
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16 For example:
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18 ps -eZ | grep xdm_t
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20
21
23 The xdm_t SELinux type can be entered via the xdm_exec_t file type.
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25 The default entrypoint paths for the xdm_t domain are the following:
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27 /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
38 You can see the context of a process using the -Z option to ps
39
40 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
44 The following process types are defined for xdm:
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46 xdm_t, xdm_unconfined_t
47
48 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.
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52
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.
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58
59
60 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
63 setsebool -P xdm_bind_vnc_tcp_port 1
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65
66
67 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
71 setsebool -P xdm_manage_bootloader 1
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73
74
75 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
79 setsebool -P xdm_sysadm_login 1
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81
82
83 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
88 setsebool -P deny_execmem 1
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90
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92 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
96 setsebool -P deny_ptrace 1
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98
99
100 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
103 setsebool -P fips_mode 1
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105
106
107 If you want to allow confined applications to run with kerberos, you
108 must turn on the kerberos_enabled boolean. Disabled by default.
109
110 setsebool -P kerberos_enabled 1
111
112
113
114 If you want to allow system to run with NIS, you must turn on the
115 nis_enabled boolean. Disabled by default.
116
117 setsebool -P nis_enabled 1
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119
120
121 If you want to enable polyinstantiated directory support, you must turn
122 on the polyinstantiation_enabled boolean. Disabled by default.
123
124 setsebool -P polyinstantiation_enabled 1
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126
127
128 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
134 setsebool -P selinuxuser_execstack 1
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136
137
138 If you want to support ecryptfs home directories, you must turn on the
139 use_ecryptfs_home_dirs boolean. Disabled by default.
140
141 setsebool -P use_ecryptfs_home_dirs 1
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143
144
145 If you want to support fusefs home directories, you must turn on the
146 use_fusefs_home_dirs boolean. Disabled by default.
147
148 setsebool -P use_fusefs_home_dirs 1
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150
151
152 If you want to support NFS home directories, you must turn on the
153 use_nfs_home_dirs boolean. Enabled by default.
154
155 setsebool -P use_nfs_home_dirs 1
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157
158
159 If you want to support SAMBA home directories, you must turn on the
160 use_samba_home_dirs boolean. Disabled by default.
161
162 setsebool -P use_samba_home_dirs 1
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164
165
167 SELinux defines port types to represent TCP and UDP ports.
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169 You can see the types associated with a port by using the following
170 command:
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172 semanage port -l
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174
175 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
179 The following port types are defined for xdm:
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182 xdmcp_port_t
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184
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186 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
195 anon_inodefs_t
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197
198 auth_cache_t
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200 /var/cache/coolkey(/.*)?
201
202 auth_home_t
203
204 /root/.yubico(/.*)?
205 /root/.google_authenticator
206 /root/.google_authenticator~
207 /home/[^/]+/.yubico(/.*)?
208 /home/[^/]+/.google_authenticator
209 /home/[^/]+/.google_authenticator~
210
211 cgroup_t
212
213 /sys/fs/cgroup
214
215 cifs_t
216
217
218 dosfs_t
219
220
221 faillog_t
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223 /var/log/btmp.*
224 /var/log/faillog.*
225 /var/log/tallylog.*
226 /var/run/faillock(/.*)?
227
228 fusefs_t
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230 /var/run/user/[^/]*/gvfs
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232 initrc_var_run_t
233
234 /var/run/utmp
235 /var/run/random-seed
236 /var/run/runlevel.dir
237 /var/run/setmixer_flag
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239 kdbusfs_t
240
241
242 lastlog_t
243
244 /var/log/lastlog.*
245
246 nfs_t
247
248
249 pam_var_console_t
250
251 /var/run/console(/.*)?
252
253 pam_var_run_t
254
255 /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
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265 security_t
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267 /selinux
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269 sysfs_t
270
271 /sys(/.*)?
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273 systemd_passwd_var_run_t
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275 /var/run/systemd/ask-password(/.*)?
276 /var/run/systemd/ask-password-block(/.*)?
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278 var_auth_t
279
280 /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
289 wtmp_t
290
291 /var/log/wtmp.*
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293 xdm_lock_t
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295
296 xdm_log_t
297
298 /var/log/[mkwx]dm.log.*
299 /var/log/mdm(/.*)?
300 /var/log/lxdm.log.*
301 /var/log/slim.log.*
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303 xdm_spool_t
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305 /var/spool/[mg]dm(/.*)?
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307 xdm_tmpfs_t
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310 xdm_var_lib_t
311
312 /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(/.*)?
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321 xdm_var_run_t
322
323 /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
340 xkb_var_lib_t
341
342 /var/lib/xkb(/.*)?
343 /usr/X11R6/lib/X11/xkb/.*
344 /usr/X11R6/lib/X11/xkb
345
346 xserver_log_t
347
348 /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
356
358 SELinux requires files to have an extended attribute to define the file
359 type.
360
361 You can see the context of a file using the -Z option to ls
362
363 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
367 EQUIVALENCE DIRECTORIES
368
369
370 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:
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376 semanage fcontext -a -e /var/lib/lightdm /srv/lightdm
377 restorecon -R -v /srv/lightdm
378
379 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
385 semanage fcontext -a -e /var/run/gdm(3)? /srv/gdm(3)?
386 restorecon -R -v /srv/gdm(3)?
387
388 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
394 semanage fcontext -a -e /var/run/lxdm /srv/lxdm
395 restorecon -R -v /srv/lxdm
396
397 STANDARD FILE CONTEXT
398
399 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.
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404 semanage fcontext -a -t xdm_log_t '/srv/myxdm_content(/.*)?'
405 restorecon -R -v /srv/myxdm_content
406
407 Note: SELinux often uses regular expressions to specify labels that
408 match multiple files.
409
410 The following file types are defined for xdm:
411
412
413
414 xdm_etc_t
415
416 - Set files with the xdm_etc_t type, if you want to store xdm files in
417 the /etc directories.
418
419
420
421 xdm_exec_t
422
423 - Set files with the xdm_exec_t type, if you want to transition an exe‐
424 cutable to the xdm_t domain.
425
426
427 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
436
437 xdm_home_t
438
439 - Set files with the xdm_home_t type, if you want to store xdm files in
440 the users home directory.
441
442
443 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
449
450 xdm_lock_t
451
452 - 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
455
456
457 xdm_log_t
458
459 - 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
462
463 Paths:
464 /var/log/[mkwx]dm.log.*, /var/log/mdm(/.*)?, /var/log/lxdm.log.*,
465 /var/log/slim.log.*
466
467
468 xdm_rw_etc_t
469
470 - Set files with the xdm_rw_etc_t type, if you want to store xdm rw
471 files in the /etc directories.
472
473
474 Paths:
475 /etc/X11/wdm(/.*)?, /etc/opt/VirtualGL(/.*)?
476
477
478 xdm_spool_t
479
480 - Set files with the xdm_spool_t type, if you want to store the xdm
481 files under the /var/spool directory.
482
483
484
485 xdm_tmpfs_t
486
487 - Set files with the xdm_tmpfs_t type, if you want to store xdm files
488 on a tmpfs file system.
489
490
491
492 xdm_unconfined_exec_t
493
494 - 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
497
498 Paths:
499 /etc/[mg]dm/Init(/.*)?, /etc/[mg]dm/PostLogin(/.*)?,
500 /etc/[mg]dm/PreSession(/.*)?, /etc/[mg]dm/PostSession(/.*)?
501
502
503 xdm_unit_file_t
504
505 - Set files with the xdm_unit_file_t type, if you want to treat the
506 files as xdm unit content.
507
508
509
510 xdm_var_lib_t
511
512 - Set files with the xdm_var_lib_t type, if you want to store the xdm
513 files under the /var/lib directory.
514
515
516 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
522
523 xdm_var_run_t
524
525 - 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
528
529 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
538
539 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
544
546 semanage fcontext can also be used to manipulate default file context
547 mappings.
548
549 semanage permissive can also be used to manipulate whether or not a
550 process type is permissive.
551
552 semanage module can also be used to enable/disable/install/remove pol‐
553 icy modules.
554
555 semanage port can also be used to manipulate the port definitions
556
557 semanage boolean can also be used to manipulate the booleans
558
559
560 system-config-selinux is a GUI tool available to customize SELinux pol‐
561 icy settings.
562
563
565 This manual page was auto-generated using sepolicy manpage .
566
567
569 selinux(8), xdm(8), semanage(8), restorecon(8), chcon(1), sepolicy(8),
570 setsebool(8), xdm_unconfined_selinux(8), xdm_unconfined_selinux(8)
571
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574xdm 20-05-05 xdm_selinux(8)