thumb_selinux(8) SELinux Policy thumb thumb_selinux(8)NAMEthumb_selinux - Security Enhanced Linux Policy for the thumb processes
DESCRIPTION
Security-Enhanced Linux secures the thumb processes via flexible manda‐
tory access control.
The thumb processes execute with the thumb_t SELinux type. You can
check if you have these processes running by executing the ps command
with the -Z qualifier.
For example:
ps -eZ | grep thumb_t
ENTRYPOINTS
The thumb_t SELinux type can be entered via the thumb_exec_t file type.
The default entrypoint paths for the thumb_t domain are the following:
/usr/bin/[^/]*thumbnailer, /usr/bin/gnome-[^/]*-thumbnailer(.sh)?,
/usr/lib/tumbler[^/]*/tumblerd, /usr/bin/raw-thumbnailer,
/usr/bin/whaaw-thumbnailer, /usr/bin/ffmpegthumbnailer,
/usr/bin/evince-thumbnailer, /usr/bin/mate-thumbnail-font,
/usr/bin/gnome-thumbnail-font, /usr/bin/gsf-office-thumbnailer,
/usr/bin/totem-video-thumbnailer, /usr/bin/shotwell-video-thumbnailer
PROCESS TYPES
SELinux defines process types (domains) for each process running on the
system
You can see the context of a process using the -Z option to ps
Policy governs the access confined processes have to files. SELinux
thumb policy is very flexible allowing users to setup their thumb pro‐
cesses in as secure a method as possible.
The following process types are defined for thumb:
thumb_t
Note: semanage permissive -a thumb_t can be used to make the process
type thumb_t permissive. SELinux does not deny access to permissive
process types, but the AVC (SELinux denials) messages are still gener‐
ated.
BOOLEANS
SELinux policy is customizable based on least access required. thumb
policy is extremely flexible and has several booleans that allow you to
manipulate the policy and run thumb with the tightest access possible.
If you want to deny user domains applications to map a memory region as
both executable and writable, this is dangerous and the executable
should be reported in bugzilla, you must turn on the deny_execmem bool‐
ean. Enabled by default.
setsebool -P deny_execmem 1
If you want to deny any process from ptracing or debugging any other
processes, you must turn on the deny_ptrace boolean. Enabled by
default.
setsebool -P deny_ptrace 1
If you want to allow all domains to use other domains file descriptors,
you must turn on the domain_fd_use boolean. Enabled by default.
setsebool -P domain_fd_use 1
If you want to allow all domains to have the kernel load modules, you
must turn on the domain_kernel_load_modules boolean. Disabled by
default.
setsebool -P domain_kernel_load_modules 1
If you want to allow all domains to execute in fips_mode, you must turn
on the fips_mode boolean. Enabled by default.
setsebool -P fips_mode 1
If you want to enable reading of urandom for all domains, you must turn
on the global_ssp boolean. Disabled by default.
setsebool -P global_ssp 1
If you want to allow all unconfined executables to use libraries
requiring text relocation that are not labeled textrel_shlib_t, you
must turn on the selinuxuser_execmod boolean. Enabled by default.
setsebool -P selinuxuser_execmod 1
If you want to support ecryptfs home directories, you must turn on the
use_ecryptfs_home_dirs boolean. Disabled by default.
setsebool -P use_ecryptfs_home_dirs 1
If you want to support fusefs home directories, you must turn on the
use_fusefs_home_dirs boolean. Disabled by default.
setsebool -P use_fusefs_home_dirs 1
If you want to support NFS home directories, you must turn on the
use_nfs_home_dirs boolean. Disabled by default.
setsebool -P use_nfs_home_dirs 1
If you want to support SAMBA home directories, you must turn on the
use_samba_home_dirs boolean. Disabled by default.
setsebool -P use_samba_home_dirs 1
MANAGED FILES
The SELinux process type thumb_t can manage files labeled with the fol‐
lowing file types. The paths listed are the default paths for these
file types. Note the processes UID still need to have DAC permissions.
cifs_t
ecryptfs_t
/home/[^/]*/.Private(/.*)?
/home/[^/]*/.ecryptfs(/.*)?
fusefs_t
/var/run/[^/]*/gvfs
gstreamer_home_t
/var/run/user/[^/]*/.orc(/.*)?
/root/.gstreamer-.*
/root/.cache/gstreamer-.*
/home/[^/]*/.orc(/.*)?
/home/[^/]*/.gstreamer-.*
/home/[^/]*/.cache/gstreamer-.*
/home/[^/]*/.grl-bookmarks
/home/[^/]*/.grl-bookmarks
/home/[^/]*/.grl-metadata-store
nfs_t
thumb_home_t
/home/[^/]*/.thumbnails(/.*)?
/home/[^/]*/missfont.log.*
/home/[^/]*/.texlive2012(/.*)?
/home/[^/]*/.cache/thumbnails(/.*)?
thumb_tmp_t
thumb_tmpfs_t
user_fonts_cache_t
/root/.fontconfig(/.*)?
/root/.fonts/auto(/.*)?
/root/.fonts.cache-.*
/home/[^/]*/.fontconfig(/.*)?
/home/[^/]*/.fonts/auto(/.*)?
/home/[^/]*/.fonts.cache-.*
FILE CONTEXTS
SELinux requires files to have an extended attribute to define the file
type.
You can see the context of a file using the -Z option to ls
Policy governs the access confined processes have to these files.
SELinux thumb policy is very flexible allowing users to setup their
thumb processes in as secure a method as possible.
STANDARD FILE CONTEXT
SELinux defines the file context types for the thumb, if you wanted to
store files with these types in a diffent paths, you need to execute
the semanage command to sepecify alternate labeling and then use
restorecon to put the labels on disk.
semanage fcontext -a -t thumb_exec_t '/srv/thumb/content(/.*)?'
restorecon -R -v /srv/mythumb_content
Note: SELinux often uses regular expressions to specify labels that
match multiple files.
The following file types are defined for thumb:
thumb_exec_t
- Set files with the thumb_exec_t type, if you want to transition an
executable to the thumb_t domain.
Paths:
/usr/bin/[^/]*thumbnailer, /usr/bin/gnome-[^/]*-thumbnailer(.sh)?,
/usr/lib/tumbler[^/]*/tumblerd, /usr/bin/raw-thumbnailer,
/usr/bin/whaaw-thumbnailer, /usr/bin/ffmpegthumbnailer,
/usr/bin/evince-thumbnailer, /usr/bin/mate-thumbnail-font,
/usr/bin/gnome-thumbnail-font, /usr/bin/gsf-office-thumbnailer,
/usr/bin/totem-video-thumbnailer, /usr/bin/shotwell-video-thumb‐
nailer
thumb_home_t
- Set files with the thumb_home_t type, if you want to store thumb
files in the users home directory.
Paths:
/home/[^/]*/.thumbnails(/.*)?, /home/[^/]*/missfont.log.*,
/home/[^/]*/.texlive2012(/.*)?, /home/[^/]*/.cache/thumb‐
nails(/.*)?
thumb_tmp_t
- Set files with the thumb_tmp_t type, if you want to store thumb tem‐
porary files in the /tmp directories.
thumb_tmpfs_t
- Set files with the thumb_tmpfs_t type, if you want to store thumb
files on a tmpfs file system.
Note: File context can be temporarily modified with the chcon command.
If you want to permanently change the file context you need to use the
semanage fcontext command. This will modify the SELinux labeling data‐
base. You will need to use restorecon to apply the labels.
COMMANDS
semanage fcontext can also be used to manipulate default file context
mappings.
semanage permissive can also be used to manipulate whether or not a
process type is permissive.
semanage module can also be used to enable/disable/install/remove pol‐
icy modules.
semanage boolean can also be used to manipulate the booleans
system-config-selinux is a GUI tool available to customize SELinux pol‐
icy settings.
AUTHOR
This manual page was auto-generated using sepolicy manpage .
SEE ALSOselinux(8), thumb(8), semanage(8), restorecon(8), chcon(1), sepolicy(8)
, setsebool(8)thumb 13-11-20 thumb_selinux(8)
