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
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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.
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15 The SELinux user will usually login to a system with a context that
16 looks like:
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18 xguest_u:xguest_r:xguest_t:s0
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20 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.
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24 SELinux policy uses the context to control the user's access.
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26 By default all users are assigned to the SELinux user via the __de‐
27 fault__ flag
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29 On Targeted policy systems the __default__ user is assigned to the un‐
30 confined_u SELinux user.
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32 You can list all Linux User to SELinux user mapping using:
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34 semanage login -l
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36 If you wanted to change the default user mapping to use the xguest_u
37 user, you would execute:
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39 semanage login -m -s xguest_u __default__
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42 If you want to map the one Linux user (joe) to the SELinux user xguest,
43 you would execute:
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45 $ semanage login -a -s xguest_u joe
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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.
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57 The SELinux user xguest_u is able to X Windows login.
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61 The SELinux user xguest_u is able to listen on the following tcp ports.
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63 1716
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66 The SELinux user xguest_u is able to connect to the following tcp
67 ports.
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69 8955
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71 53,853
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73 4713
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75 4331,5001
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77 80,81,443,488,8008,8009,8443,9000
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79 8080,8118,8123,10001-10010
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81 3128,3401,4827
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83 843,1935
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85 21,989,990
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87 631,8610-8614
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89 32768-60999
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91 all ports without defined types
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93 8000,9433,16001
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95 8036
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97 8081
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99 9080
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101 88,750,4444
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104 The SELinux user xguest_u is able to connect to the following tcp
105 ports.
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107 8955
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109 53,853
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111 4713
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113 4331,5001
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115 80,81,443,488,8008,8009,8443,9000
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117 8080,8118,8123,10001-10010
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119 3128,3401,4827
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121 843,1935
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123 21,989,990
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125 631,8610-8614
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127 32768-60999
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129 all ports without defined types
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131 8000,9433,16001
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133 8036
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135 8081
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137 9080
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139 88,750,4444
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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.
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149 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.
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153 setsebool -P xguest_connect_network 1
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157 If you want to allow xguest users to mount removable media, you must
158 turn on the xguest_mount_media boolean. Enabled by default.
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160 setsebool -P xguest_mount_media 1
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164 If you want to allow xguest to use blue tooth devices, you must turn on
165 the xguest_use_bluetooth boolean. Enabled by default.
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167 setsebool -P xguest_use_bluetooth 1
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171 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.
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175 setsebool -P deny_bluetooth 1
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179 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.
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184 setsebool -P deny_execmem 1
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188 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.
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192 setsebool -P deny_ptrace 1
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196 If you want to allow all domains to execute in fips_mode, you must turn
197 on the fips_mode boolean. Enabled by default.
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199 setsebool -P fips_mode 1
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203 If you want to allow httpd cgi support, you must turn on the httpd_en‐
204 able_cgi boolean. Enabled by default.
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206 setsebool -P httpd_enable_cgi 1
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210 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.
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213 setsebool -P nscd_use_shm 1
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217 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.
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223 setsebool -P selinuxuser_execstack 1
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227 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.
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231 setsebool -P selinuxuser_rw_noexattrfile 1
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235 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.
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238 setsebool -P selinuxuser_use_ssh_chroot 1
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242 If you want to support NFS home directories, you must turn on the
243 use_nfs_home_dirs boolean. Disabled by default.
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245 setsebool -P use_nfs_home_dirs 1
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249 If you want to support SAMBA home directories, you must turn on the
250 use_samba_home_dirs boolean. Disabled by default.
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252 setsebool -P use_samba_home_dirs 1
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257 The SELinux user xguest_u is able execute home content files.
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261 Three things can happen when xguest_t attempts to execute a program.
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263 1. SELinux Policy can deny xguest_t from executing the program.
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267 2. SELinux Policy can allow xguest_t to execute the program in the cur‐
268 rent user type.
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270 Execute the following to see the types that the SELinux user
271 xguest_t can execute without transitioning:
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273 sesearch -A -s xguest_t -c file -p execute_no_trans
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277 3. SELinux can allow xguest_t to execute the program and transition to
278 a new type.
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280 Execute the following to see the types that the SELinux user
281 xguest_t can execute and transition:
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283 $ sesearch -A -s xguest_t -c process -p transition
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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.
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292 alsa_home_t
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294 /home/[^/]+/.asoundrc
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296 auth_cache_t
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298 /var/cache/coolkey(/.*)?
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300 chrome_sandbox_tmpfs_t
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303 gconf_tmp_t
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305 /tmp/gconfd-[^/]+/.*
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307 httpd_user_content_t
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309 /home/[^/]+/((www)|(web)|(public_html))(/.+)?
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311 httpd_user_htaccess_t
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313 /home/[^/]+/((www)|(web)|(public_html))(/.*)?/.htaccess
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315 httpd_user_ra_content_t
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317 /home/[^/]+/((www)|(web)|(public_html))(/.*)?/logs(/.*)?
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319 httpd_user_rw_content_t
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322 httpd_user_script_exec_t
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324 /home/[^/]+/((www)|(web)|(public_html))/cgi-bin(/.+)?
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326 noxattrfs
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328 all files on file systems which do not support extended attributes
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330 pkcs_slotd_tmpfs_t
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332 /dev/shm/var.lib.opencryptoki.*
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334 pulseaudio_tmpfs_t
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337 pulseaudio_tmpfsfile
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340 session_dbusd_tmp_t
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342 /var/run/user/[0-9]+/dbus(/.*)?
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344 usbfs_t
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347 user_fonts_cache_t
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349 /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(/.*)?
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358 user_home_type
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360 all user home files
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362 user_tmp_t
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364 /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-[^/]+
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376 user_tmp_type
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378 all user tmp files
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380 xserver_tmpfs_t
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385 semanage fcontext can also be used to manipulate default file context
386 mappings.
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388 semanage permissive can also be used to manipulate whether or not a
389 process type is permissive.
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391 semanage module can also be used to enable/disable/install/remove pol‐
392 icy modules.
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394 semanage boolean can also be used to manipulate the booleans
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397 system-config-selinux is a GUI tool available to customize SELinux pol‐
398 icy settings.
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402 This manual page was auto-generated using sepolicy manpage .
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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)
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412mgrepl@redhat.com xguest xguest_selinux(8)