Security-Enhanced Linux secures the glusterd processes via flexible mandatory access control.
The glusterd processes execute with the glusterd_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 glusterd_t
The glusterd_t SELinux type can be entered via the glusterd_exec_t file type.
The default entrypoint paths for the glusterd_t domain are the following:
/opt/glusterfs/[^/]+/sbin/glusterfsd, /usr/libexec/glusterfs/peer_eventsapi.py, /usr/libexec/glusterfs/events/glustereventsd.py, /usr/sbin/glusterfsd, /usr/sbin/glustereventsd, /usr/sbin/gluster-eventsapi
You can see the context of a process using the -Z option to psP Policy governs the access confined processes have to files. SELinux glusterd policy is very flexible allowing users to setup their glusterd processes in as secure a method as possible.
The following process types are defined for glusterd:
glusterd_t
Note: semanage permissive -a glusterd_t can be used to make the process type glusterd_t permissive. SELinux does not deny access to permissive process types, but the AVC (SELinux denials) messages are still generated.
If you want to allow glusterfsd to share any file/directory read only, you must turn on the gluster_export_all_ro boolean. Disabled by default.
setsebool -P gluster_export_all_ro 1
If you want to allow glusterfsd to share any file/directory read/write, you must turn on the gluster_export_all_rw boolean. Enabled by default.
setsebool -P gluster_export_all_rw 1
If you want to allow glusterd_t domain to use executable memory, you must turn on the gluster_use_execmem boolean. Disabled by default.
setsebool -P gluster_use_execmem 1
If you want to allow users to resolve user passwd entries directly from ldap rather then using a sssd server, you must turn on the authlogin_nsswitch_use_ldap boolean. Disabled by default.
setsebool -P authlogin_nsswitch_use_ldap 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 allow confined applications to run with kerberos, you must turn on the kerberos_enabled boolean. Enabled by default.
setsebool -P kerberos_enabled 1
If you want to allow system to run with NIS, you must turn on the nis_enabled boolean. Disabled by default.
setsebool -P nis_enabled 1
If you want to allow confined applications to use nscd shared memory, you must turn on the nscd_use_shm boolean. Enabled by default.
setsebool -P nscd_use_shm 1
You can see the types associated with a port by using the following command:
semanage port -l
Policy governs the access confined processes have to these ports. SELinux glusterd policy is very flexible allowing users to setup their glusterd processes in as secure a method as possible.
The following port types are defined for glusterd:
Default Defined Ports: tcp 38465-38469,24007-24027
The SELinux process type glusterd_t can manage files labeled with the following file types. The paths listed are the default paths for these file types. Note the processes UID still need to have DAC permissions.
cluster_conf_t
/etc/cluster(/.*)?
cluster_var_lib_t
/var/lib/pcsd(/.*)?
/var/lib/cluster(/.*)?
/var/lib/openais(/.*)?
/var/lib/pengine(/.*)?
/var/lib/corosync(/.*)?
/usr/lib/heartbeat(/.*)?
/var/lib/heartbeat(/.*)?
/var/lib/pacemaker(/.*)?
cluster_var_run_t
/var/run/crm(/.*)?
/var/run/cman_.*
/var/run/rsctmp(/.*)?
/var/run/aisexec.*
/var/run/heartbeat(/.*)?
/var/run/corosync-qnetd(/.*)?
/var/run/corosync-qdevice(/.*)?
/var/run/corosync.pid
/var/run/cpglockd.pid
/var/run/rgmanager.pid
/var/run/cluster/rgmanager.sk
glusterd_brick_t
glusterd_conf_t
/etc/glusterd(/.*)?
/etc/glusterfs(/.*)?
glusterd_log_t
/var/log/glusterfs(/.*)?
glusterd_tmp_t
glusterd_tmpfs_t
glusterd_var_lib_t
/var/lib/glusterd(/.*)?
glusterd_var_run_t
/var/run/gluster(/.*)?
/var/run/glusterd.*
/var/run/glusterd.*
/var/run/glusterd(/.*)?
initrc_state_t
initrc_tmp_t
non_security_file_type
noxattrfs
all files on file systems which do not support extended attributes
public_content_rw_t
/var/spool/abrt-upload(/.*)?
/storage/local/public
/storage/local/public(/.*)?
root_t
/sysroot/ostree/deploy/.*-atomic/deploy(/.*)?
/
/initrd
samba_etc_t
/etc/samba(/.*)?
systemd_passwd_var_run_t
/var/run/systemd/ask-password(/.*)?
/var/run/systemd/ask-password-block(/.*)?
user_tmp_t
/dev/shm/mono.*
/var/run/user(/.*)?
/tmp/.ICE-unix(/.*)?
/tmp/.X11-unix(/.*)?
/dev/shm/pulse-shm.*
/tmp/.X0-lock
/tmp/hsperfdata_root
/var/tmp/hsperfdata_root
/home/[^/]+/tmp
/home/[^/]+/.tmp
/tmp/gconfd-[^/]+
var_lib_nfs_t
/var/lib/nfs(/.*)?
You can see the context of a file using the -Z option to lsP Policy governs the access confined processes have to these files. SELinux glusterd policy is very flexible allowing users to setup their glusterd processes in as secure a method as possible.
EQUIVALENCE DIRECTORIES
glusterd policy stores data with multiple different file context types under the /var/run/gluster directory. If you would like to store the data in a different directory you can use the semanage command to create an equivalence mapping. If you wanted to store this data under the /srv dirctory you would execute the following command:
semanage fcontext -a -e /var/run/gluster /srv/gluster
restorecon -R -v /srv/gluster
STANDARD FILE CONTEXT
SELinux defines the file context types for the glusterd, 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 glusterd_brick_t '/srv/myglusterd_content(/.*)?'
restorecon -R -v /srv/myglusterd_content
Note: SELinux often uses regular expressions to specify labels that match multiple files.
The following file types are defined for glusterd:
glusterd_brick_t
- Set files with the glusterd_brick_t type, if you want to treat the files as glusterd brick data.
glusterd_conf_t
- Set files with the glusterd_conf_t type, if you want to treat the files as glusterd configuration data, usually stored under the /etc directory.
glusterd_exec_t
- Set files with the glusterd_exec_t type, if you want to transition an executable to the glusterd_t domain.
glusterd_initrc_exec_t
- Set files with the glusterd_initrc_exec_t type, if you want to transition an executable to the glusterd_initrc_t domain.
glusterd_log_t
- Set files with the glusterd_log_t type, if you want to treat the data as glusterd log data, usually stored under the /var/log directory.
glusterd_tmp_t
- Set files with the glusterd_tmp_t type, if you want to store glusterd temporary files in the /tmp directories.
glusterd_tmpfs_t
- Set files with the glusterd_tmpfs_t type, if you want to store glusterd files on a tmpfs file system.
glusterd_var_lib_t
- Set files with the glusterd_var_lib_t type, if you want to store the glusterd files under the /var/lib directory.
glusterd_var_run_t
- Set files with the glusterd_var_run_t type, if you want to store the glusterd 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 database. You will need to use restorecon to apply the labels.
semanage fcontext -a -t public_content_t "/var/glusterd(/.*)?"
restorecon -F -R -v /var/glusterd
semanage fcontext -a -t public_content_rw_t "/var/glusterd/incoming(/.*)?"
restorecon -F -R -v /var/glusterd/incoming
setsebool -P glusterd_anon_write 1
If you want to allow glusterfsd to modify public files used for public file transfer services. Files/Directories must be labeled public_content_rw_t., you must turn on the gluster_anon_write boolean.
setsebool -P gluster_anon_write 1
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 policy modules.
semanage port can also be used to manipulate the port definitions
semanage boolean can also be used to manipulate the booleans
system-config-selinux is a GUI tool available to customize SELinux policy settings.