blktap_selinux(8) SELinux Policy blktap blktap_selinux(8)NAMEblktap_selinux - Security Enhanced Linux Policy for the blktap pro‐
cesses
DESCRIPTION
Security-Enhanced Linux secures the blktap processes via flexible
mandatory access control.
The blktap processes execute with the blktap_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 blktap_t
ENTRYPOINTS
The blktap_t SELinux type can be entered via the blktap_exec_t file
type.
The default entrypoint paths for the blktap_t domain are the following:
/usr/sbin/tapdisk, /usr/sbin/blktapctrl
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
blktap policy is very flexible allowing users to setup their blktap
processes in as secure a method as possible.
The following process types are defined for blktap:
blktap_t
Note: semanage permissive -a blktap_t can be used to make the process
type blktap_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. blktap
policy is extremely flexible and has several booleans that allow you to
manipulate the policy and run blktap 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
If you want to allow xend to run blktapctrl/tapdisk. Not required if
using dedicated logical volumes for disk images, you must turn on the
xend_run_blktap boolean. Enabled by default.
setsebool -P xend_run_blktap 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 blktap policy is very flexible allowing users to setup their
blktap processes in as secure a method as possible.
STANDARD FILE CONTEXT
SELinux defines the file context types for the blktap, 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 blktap_exec_t '/srv/blktap/content(/.*)?'
restorecon -R -v /srv/myblktap_content
Note: SELinux often uses regular expressions to specify labels that
match multiple files.
The following file types are defined for blktap:
blktap_exec_t
- Set files with the blktap_exec_t type, if you want to transition an
executable to the blktap_t domain.
Paths:
/usr/sbin/tapdisk, /usr/sbin/blktapctrl
blktap_var_run_t
- Set files with the blktap_var_run_t type, if you want to store the
blktap 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), blktap(8), semanage(8), restorecon(8), chcon(1), sepol‐
icy(8) , setsebool(8)blktap 13-11-20 blktap_selinux(8)
