thumb_selinux(8)

1thumb_selinux(8)             SELinux Policy thumb             thumb_selinux(8)
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NAME

6       thumb_selinux - Security Enhanced Linux Policy for the thumb processes
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DESCRIPTION

9       Security-Enhanced Linux secures the thumb processes via flexible manda‐
10       tory access control.
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12       The thumb processes execute with the  thumb_t  SELinux  type.  You  can
13       check  if  you have these processes running by executing the ps command
14       with the -Z qualifier.
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16       For example:
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18       ps -eZ | grep thumb_t
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ENTRYPOINTS

23       The thumb_t SELinux type can be entered via the thumb_exec_t file type.
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25       The default entrypoint paths for the thumb_t domain are the following:
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27       /usr/bin/[^/]*thumbnailer,      /usr/bin/gnome-[^/]*-thumbnailer(.sh)?,
28       /usr/lib/tumbler-?[^/]*/tumblerd,             /usr/bin/raw-thumbnailer,
29       /usr/bin/whaaw-thumbnailer,                 /usr/bin/ffmpegthumbnailer,
30       /usr/bin/evince-thumbnailer,              /usr/bin/mate-thumbnail-font,
31       /usr/bin/gnome-thumbnail-font,         /usr/bin/gsf-office-thumbnailer,
32       /usr/bin/totem-video-thumbnailer, /usr/bin/shotwell-video-thumbnailer
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PROCESS TYPES

35       SELinux defines process types (domains) for each process running on the
36       system
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38       You can see the context of a process using the -Z option to ps
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40       Policy governs the access confined processes have  to  files.   SELinux
41       thumb  policy is very flexible allowing users to setup their thumb pro‐
42       cesses in as secure a method as possible.
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44       The following process types are defined for thumb:
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46       thumb_t
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48       Note: semanage permissive -a thumb_t can be used to  make  the  process
49       type  thumb_t  permissive.  SELinux  does not deny access to permissive
50       process types, but the AVC (SELinux denials) messages are still  gener‐
51       ated.
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BOOLEANS

55       SELinux  policy  is customizable based on least access required.  thumb
56       policy is extremely flexible and has several booleans that allow you to
57       manipulate the policy and run thumb with the tightest access possible.
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61       If you want to deny user domains applications to map a memory region as
62       both executable and writable, this  is  dangerous  and  the  executable
63       should be reported in bugzilla, you must turn on the deny_execmem bool‐
64       ean. Enabled by default.
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66       setsebool -P deny_execmem 1
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70       If you want to deny any process from ptracing or  debugging  any  other
71       processes,  you  must  turn  on  the  deny_ptrace  boolean.  Enabled by
72       default.
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74       setsebool -P deny_ptrace 1
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78       If you want to allow any process  to  mmap  any  file  on  system  with
79       attribute  file_type,  you must turn on the domain_can_mmap_files bool‐
80       ean. Enabled by default.
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82       setsebool -P domain_can_mmap_files 1
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86       If you want to allow all domains write to kmsg_device, while kernel  is
87       executed  with  systemd.log_target=kmsg parameter, you must turn on the
88       domain_can_write_kmsg boolean. Disabled by default.
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90       setsebool -P domain_can_write_kmsg 1
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94       If you want to allow all domains to use other domains file descriptors,
95       you must turn on the domain_fd_use boolean. Enabled by default.
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97       setsebool -P domain_fd_use 1
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101       If  you  want to allow all domains to have the kernel load modules, you
102       must  turn  on  the  domain_kernel_load_modules  boolean.  Disabled  by
103       default.
104
105       setsebool -P domain_kernel_load_modules 1
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109       If you want to allow all domains to execute in fips_mode, you must turn
110       on the fips_mode boolean. Enabled by default.
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112       setsebool -P fips_mode 1
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116       If you want to enable reading of urandom for all domains, you must turn
117       on the global_ssp boolean. Disabled by default.
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119       setsebool -P global_ssp 1
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123       If  you  want  to  allow  all  unconfined  executables to use libraries
124       requiring text relocation that are  not  labeled  textrel_shlib_t,  you
125       must turn on the selinuxuser_execmod boolean. Enabled by default.
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127       setsebool -P selinuxuser_execmod 1
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131       If  you want to support ecryptfs home directories, you must turn on the
132       use_ecryptfs_home_dirs boolean. Disabled by default.
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134       setsebool -P use_ecryptfs_home_dirs 1
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138       If you want to support fusefs home directories, you must  turn  on  the
139       use_fusefs_home_dirs boolean. Disabled by default.
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141       setsebool -P use_fusefs_home_dirs 1
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145       If  you  want  to  support  NFS  home directories, you must turn on the
146       use_nfs_home_dirs boolean. Disabled by default.
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148       setsebool -P use_nfs_home_dirs 1
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152       If you want to support SAMBA home directories, you  must  turn  on  the
153       use_samba_home_dirs boolean. Disabled by default.
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155       setsebool -P use_samba_home_dirs 1
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MANAGED FILES

160       The SELinux process type thumb_t can manage files labeled with the fol‐
161       lowing file types.  The paths listed are the default  paths  for  these
162       file types.  Note the processes UID still need to have DAC permissions.
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164       cifs_t
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167       ecryptfs_t
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169            /home/[^/]+/.Private(/.*)?
170            /home/[^/]+/.ecryptfs(/.*)?
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172       fusefs_t
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174            /var/run/user/[^/]*/gvfs
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176       gstreamer_home_t
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178            /var/run/user/[^/]*/.orc(/.*)?
179            /root/.gstreamer-.*
180            /root/.cache/gstreamer-.*
181            /home/[^/]+/.orc(/.*)?
182            /home/[^/]+/.gstreamer-.*
183            /home/[^/]+/.nv/GLCache(/.*)?
184            /home/[^/]+/.cache/GLCache(/.*)?
185            /home/[^/]+/.cache/gstreamer-.*
186            /home/[^/]+/.grl-bookmarks
187            /home/[^/]+/.grl-metadata-store
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189       nfs_t
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192       texlive_home_t
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194            /home/[^/]+/.texlive2012(/.*)?
195            /home/[^/]+/.texlive2013(/.*)?
196            /home/[^/]+/.texlive2014(/.*)?
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198       thumb_home_t
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200            /home/[^/]+/.thumbnails(/.*)?
201            /home/[^/]+/missfont.log.*
202            /home/[^/]+/.cache/thumbnails(/.*)?
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204       thumb_tmp_t
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207       thumb_tmpfs_t
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209
210       user_fonts_cache_t
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212            /root/.fontconfig(/.*)?
213            /root/.fonts/auto(/.*)?
214            /root/.fonts.cache-.*
215            /home/[^/]+/.fontconfig(/.*)?
216            /home/[^/]+/.fonts/auto(/.*)?
217            /home/[^/]+/.fonts.cache-.*
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219       user_tmp_t
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221            /dev/shm/mono.*
222            /var/run/user(/.*)?
223            /tmp/.X11-unix(/.*)?
224            /tmp/.ICE-unix(/.*)?
225            /dev/shm/pulse-shm.*
226            /tmp/.X0-lock
227            /tmp/hsperfdata_root
228            /var/tmp/hsperfdata_root
229            /home/[^/]+/tmp
230            /home/[^/]+/.tmp
231            /tmp/gconfd-[^/]+
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FILE CONTEXTS

235       SELinux requires files to have an extended attribute to define the file
236       type.
237
238       You can see the context of a file using the -Z option to ls
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240       Policy governs the access  confined  processes  have  to  these  files.
241       SELinux  thumb  policy  is  very flexible allowing users to setup their
242       thumb processes in as secure a method as possible.
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244       STANDARD FILE CONTEXT
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246       SELinux defines the file context types for the thumb, if you wanted  to
247       store  files  with  these types in a diffent paths, you need to execute
248       the semanage command  to  sepecify  alternate  labeling  and  then  use
249       restorecon to put the labels on disk.
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251       semanage fcontext -a -t thumb_tmpfs_t '/srv/mythumb_content(/.*)?'
252       restorecon -R -v /srv/mythumb_content
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254       Note:  SELinux  often  uses  regular expressions to specify labels that
255       match multiple files.
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257       The following file types are defined for thumb:
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261       thumb_exec_t
262
263       - Set files with the thumb_exec_t type, if you want  to  transition  an
264       executable to the thumb_t domain.
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266
267       Paths:
268            /usr/bin/[^/]*thumbnailer, /usr/bin/gnome-[^/]*-thumbnailer(.sh)?,
269            /usr/lib/tumbler-?[^/]*/tumblerd,        /usr/bin/raw-thumbnailer,
270            /usr/bin/whaaw-thumbnailer,            /usr/bin/ffmpegthumbnailer,
271            /usr/bin/evince-thumbnailer,         /usr/bin/mate-thumbnail-font,
272            /usr/bin/gnome-thumbnail-font,    /usr/bin/gsf-office-thumbnailer,
273            /usr/bin/totem-video-thumbnailer,   /usr/bin/shotwell-video-thumb‐
274            nailer
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277       thumb_home_t
278
279       -  Set  files  with  the  thumb_home_t type, if you want to store thumb
280       files in the users home directory.
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283       Paths:
284            /home/[^/]+/.thumbnails(/.*)?,         /home/[^/]+/missfont.log.*,
285            /home/[^/]+/.cache/thumbnails(/.*)?
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287
288       thumb_tmp_t
289
290       -  Set files with the thumb_tmp_t type, if you want to store thumb tem‐
291       porary files in the /tmp directories.
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295       thumb_tmpfs_t
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297       - Set files with the thumb_tmpfs_t type, if you  want  to  store  thumb
298       files on a tmpfs file system.
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302       Note:  File context can be temporarily modified with the chcon command.
303       If you want to permanently change the file context you need to use  the
304       semanage fcontext command.  This will modify the SELinux labeling data‐
305       base.  You will need to use restorecon to apply the labels.
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COMMANDS

309       semanage fcontext can also be used to manipulate default  file  context
310       mappings.
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312       semanage  permissive  can  also  be used to manipulate whether or not a
313       process type is permissive.
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315       semanage module can also be used to enable/disable/install/remove  pol‐
316       icy modules.
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318       semanage boolean can also be used to manipulate the booleans
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321       system-config-selinux is a GUI tool available to customize SELinux pol‐
322       icy settings.
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AUTHOR

326       This manual page was auto-generated using sepolicy manpage .
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