1xguest_selinux(8) xguest SELinux Policy documentation xguest_selinux(8)
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6 xguest_u - Least privileged xwindows user role. - Security Enhanced
7 Linux Policy
8
11 xguest_u is an SELinux User defined in the SELinux policy. SELinux
12 users have default roles, xguest_r. The default role has a default
13 type, xguest_t, associated with it.
14 The SELinux user will usually login to a system with a context that
16 looks like:
17 xguest_u:xguest_r:xguest_t:s0
19 Linux users are automatically assigned an SELinux users at login. Lo‐
21 gin programs use the SELinux User to assign initial context to the
22 user's shell.
23 SELinux policy uses the context to control the user's access.
25 By default all users are assigned to the SELinux user via the __de‐
27 fault__ flag
28 On Targeted policy systems the __default__ user is assigned to the un‐
30 confined_u SELinux user.
31 You can list all Linux User to SELinux user mapping using:
33 semanage login -l
35 If you wanted to change the default user mapping to use the xguest_u
37 user, you would execute:
38 semanage login -m -s xguest_u __default__
40 If you want to map the one Linux user (joe) to the SELinux user xguest,
43 you would execute:
44 $ semanage login -a -s xguest_u joe
46
50 The SELinux user xguest_u is defined in policy as a unprivileged user.
51 SELinux prevents unprivileged users from doing administration tasks
52 without transitioning to a different role.
53
57 The SELinux user xguest_u is able to X Windows login.
58
61 The SELinux user xguest_u is able to listen on the following tcp ports.
62 1716
64 The SELinux user xguest_u is able to connect to the following tcp
67 ports.
68 8955
70 53,853
72 4713
74 4331,5001
76 80,81,443,488,8008,8009,8443,9000
78 8080,8118,8123,10001-10010
80 3128,3401,4827
82 843,1935
84 21,989,990
86 631,8610-8614
88 32768-60999
90 all ports without defined types
92 8000,9433,16001
94 8036
96 8081
98 9080
100 88,750,4444
102 The SELinux user xguest_u is able to connect to the following tcp
105 ports.
106 8955
108 53,853
110 4713
112 4331,5001
114 80,81,443,488,8008,8009,8443,9000
116 8080,8118,8123,10001-10010
118 3128,3401,4827
120 843,1935
122 21,989,990
124 631,8610-8614
126 32768-60999
128 all ports without defined types
130 8000,9433,16001
132 8036
134 8081
136 9080
138 88,750,4444
140
143 SELinux policy is customizable based on least access required. xguest
144 policy is extremely flexible and has several booleans that allow you to
145 manipulate the policy and run xguest with the tightest access possible.
146 If you want to allow xguest users to configure Network Manager and con‐
150 nect to apache ports, you must turn on the xguest_connect_network bool‐
151 ean. Enabled by default.
152 setsebool -P xguest_connect_network 1
154 If you want to allow xguest users to mount removable media, you must
158 turn on the xguest_mount_media boolean. Enabled by default.
159 setsebool -P xguest_mount_media 1
161 If you want to allow xguest to use blue tooth devices, you must turn on
165 the xguest_use_bluetooth boolean. Enabled by default.
166 setsebool -P xguest_use_bluetooth 1
168 If you want to deny all system processes and Linux users to use blue‐
172 tooth wireless technology, you must turn on the deny_bluetooth boolean.
173 Enabled by default.
174 setsebool -P deny_bluetooth 1
176 If you want to deny user domains applications to map a memory region as
180 both executable and writable, this is dangerous and the executable
181 should be reported in bugzilla, you must turn on the deny_execmem bool‐
182 ean. Enabled by default.
183 setsebool -P deny_execmem 1
185 If you want to deny any process from ptracing or debugging any other
189 processes, you must turn on the deny_ptrace boolean. Enabled by de‐
190 fault.
191 setsebool -P deny_ptrace 1
193 If you want to allow all domains to execute in fips_mode, you must turn
197 on the fips_mode boolean. Enabled by default.
198 setsebool -P fips_mode 1
200 If you want to allow httpd cgi support, you must turn on the httpd_en‐
204 able_cgi boolean. Enabled by default.
205 setsebool -P httpd_enable_cgi 1
207 If you want to allow confined applications to use nscd shared memory,
211 you must turn on the nscd_use_shm boolean. Enabled by default.
212 setsebool -P nscd_use_shm 1
214 If you want to allow unconfined executables to make their stack exe‐
218 cutable. This should never, ever be necessary. Probably indicates a
219 badly coded executable, but could indicate an attack. This executable
220 should be reported in bugzilla, you must turn on the selinuxuser_exec‐
221 stack boolean. Enabled by default.
222 setsebool -P selinuxuser_execstack 1
224 If you want to allow user to r/w files on filesystems that do not have
228 extended attributes (FAT, CDROM, FLOPPY), you must turn on the selin‐
229 uxuser_rw_noexattrfile boolean. Disabled by default.
230 setsebool -P selinuxuser_rw_noexattrfile 1
232 If you want to allow user to use ssh chroot environment, you must turn
236 on the selinuxuser_use_ssh_chroot boolean. Disabled by default.
237 setsebool -P selinuxuser_use_ssh_chroot 1
239 If you want to support NFS home directories, you must turn on the
243 use_nfs_home_dirs boolean. Disabled by default.
244 setsebool -P use_nfs_home_dirs 1
246 If you want to support SAMBA home directories, you must turn on the
250 use_samba_home_dirs boolean. Disabled by default.
251 setsebool -P use_samba_home_dirs 1
253
257 The SELinux user xguest_u is able execute home content files.
258
261 Three things can happen when xguest_t attempts to execute a program.
262 1. SELinux Policy can deny xguest_t from executing the program.
264 2. SELinux Policy can allow xguest_t to execute the program in the cur‐
268 rent user type.
269 Execute the following to see the types that the SELinux user
271 xguest_t can execute without transitioning:
272 sesearch -A -s xguest_t -c file -p execute_no_trans
274 3. SELinux can allow xguest_t to execute the program and transition to
278 a new type.
279 Execute the following to see the types that the SELinux user
281 xguest_t can execute and transition:
282 $ sesearch -A -s xguest_t -c process -p transition
284
288 The SELinux process type xguest_t can manage files labeled with the
289 following file types. The paths listed are the default paths for these
290 file types. Note the processes UID still need to have DAC permissions.
291 alsa_home_t
293 /home/[^/]+/.asoundrc
295 auth_cache_t
297 /var/cache/coolkey(/.*)?
299 chrome_sandbox_tmpfs_t
301 gconf_tmp_t
304 /tmp/gconfd-[^/]+/.*
306 httpd_user_content_t
308 /home/[^/]+/((www)|(web)|(public_html))(/.+)?
310 httpd_user_htaccess_t
312 /home/[^/]+/((www)|(web)|(public_html))(/.*)?/.htaccess
314 httpd_user_ra_content_t
316 /home/[^/]+/((www)|(web)|(public_html))(/.*)?/logs(/.*)?
318 httpd_user_rw_content_t
320 httpd_user_script_exec_t
323 /home/[^/]+/((www)|(web)|(public_html))/cgi-bin(/.+)?
325 noxattrfs
327 all files on file systems which do not support extended attributes
329 pkcs_slotd_tmpfs_t
331 /dev/shm/var.lib.opencryptoki.*
333 pulseaudio_tmpfs_t
335 pulseaudio_tmpfsfile
338 session_dbusd_tmp_t
341 /var/run/user/[0-9]+/dbus(/.*)?
343 usbfs_t
345 user_fonts_cache_t
348 /root/.fontconfig(/.*)?
350 /root/.fonts/auto(/.*)?
351 /root/.fonts.cache-.*
352 /root/.cache/fontconfig(/.*)?
353 /home/[^/]+/.fontconfig(/.*)?
354 /home/[^/]+/.fonts/auto(/.*)?
355 /home/[^/]+/.fonts.cache-.*
356 /home/[^/]+/.cache/fontconfig(/.*)?
357 user_home_type
359 all user home files
361 user_tmp_t
363 /dev/shm/mono.*
365 /var/run/user(/.*)?
366 /tmp/.ICE-unix(/.*)?
367 /tmp/.X11-unix(/.*)?
368 /dev/shm/pulse-shm.*
369 /tmp/.X0-lock
370 /tmp/hsperfdata_root
371 /var/tmp/hsperfdata_root
372 /home/[^/]+/tmp
373 /home/[^/]+/.tmp
374 /tmp/gconfd-[^/]+
375 user_tmp_type
377 all user tmp files
379 xserver_tmpfs_t
381
385 semanage fcontext can also be used to manipulate default file context
386 mappings.
387 semanage permissive can also be used to manipulate whether or not a
389 process type is permissive.
390 semanage module can also be used to enable/disable/install/remove pol‐
392 icy modules.
393 semanage boolean can also be used to manipulate the booleans
395 system-config-selinux is a GUI tool available to customize SELinux pol‐
398 icy settings.
399
402 This manual page was auto-generated using sepolicy manpage .
403
406 selinux(8), xguest(8), semanage(8), restorecon(8), chcon(1), sepol‐
407 icy(8), setsebool(8), xguest_dbusd_selinux(8), xguest_dbusd_selinux(8),
408 xguest_gkeyringd_selinux(8), xguest_gkeyringd_selinux(8)
409mgrepl@redhat.com xguest xguest_selinux(8)