plymouth_selinux(8) SELinux Policy plymouth plymouth_selinux(8)NAMEplymouth_selinux - Security Enhanced Linux Policy for the plymouth pro‐
cesses
DESCRIPTION
Security-Enhanced Linux secures the plymouth processes via flexible
mandatory access control.
The plymouth processes execute with the plymouth_t SELinux type. You
can check if you have these processes running by executing the ps com‐
mand with the -Z qualifier.
For example:
ps -eZ | grep plymouth_t
ENTRYPOINTS
The plymouth_t SELinux type can be entered via the plymouth_exec_t file
type.
The default entrypoint paths for the plymouth_t domain are the follow‐
ing:
/bin/plymouth, /usr/bin/plymouth
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
plymouth policy is very flexible allowing users to setup their plymouth
processes in as secure a method as possible.
The following process types are defined for plymouth:
plymouth_t, plymouthd_t
Note: semanage permissive -a plymouth_t can be used to make the process
type plymouth_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. ply‐
mouth policy is extremely flexible and has several booleans that allow
you to manipulate the policy and run plymouth with the tightest access
possible.
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
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 plymouth policy is very flexible allowing users to setup their
plymouth processes in as secure a method as possible.
STANDARD FILE CONTEXT
SELinux defines the file context types for the plymouth, 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 plymouth_exec_t '/srv/plymouth/content(/.*)?'
restorecon -R -v /srv/myplymouth_content
Note: SELinux often uses regular expressions to specify labels that
match multiple files.
The following file types are defined for plymouth:
plymouth_exec_t
- Set files with the plymouth_exec_t type, if you want to transition an
executable to the plymouth_t domain.
Paths:
/bin/plymouth, /usr/bin/plymouth
plymouthd_exec_t
- Set files with the plymouthd_exec_t type, if you want to transition
an executable to the plymouthd_t domain.
Paths:
/sbin/plymouthd, /usr/sbin/plymouthd
plymouthd_spool_t
- Set files with the plymouthd_spool_t type, if you want to store the
plymouthd files under the /var/spool directory.
plymouthd_var_lib_t
- Set files with the plymouthd_var_lib_t type, if you want to store the
plymouthd files under the /var/lib directory.
plymouthd_var_log_t
- Set files with the plymouthd_var_log_t type, if you want to treat the
data as plymouthd var log data, usually stored under the /var/log
directory.
plymouthd_var_run_t
- Set files with the plymouthd_var_run_t type, if you want to store the
plymouthd files under the /run or /var/run directory.
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), plymouth(8), semanage(8), restorecon(8), chcon(1), sepol‐
icy(8) , setsebool(8)plymouth 13-11-20 plymouth_selinux(8)
