nfsd_selinux(8) nfsd SELinux Policy documentation nfsd_selinux(8)NAMEnfsd_selinux - Security Enhanced Linux Policy for the nfsd processes
DESCRIPTION
Security-Enhanced Linux secures the nfsd processes via flexible manda‐
tory access control.
BOOLEANS
SELinux policy is customizable based on least access required. nfsd
policy is extremely flexible and has several booleans that allow you to
manipulate the policy and run nfsd with the tightest access possible.
If you want to allow xen to manage nfs file, you must turn on the
xen_use_nfs boolean.
setsebool -P xen_use_nfs 1
If you want to allow confined virtual guests to manage nfs file, you
must turn on the virt_use_nfs boolean.
setsebool -P virt_use_nfs 1
If you want to allow ftp servers to use nfs used for public file trans‐
fer services, you must turn on the allow_ftpd_use_nfs boolean.
setsebool -P allow_ftpd_use_nfs 1
If you want to allow Git daemon system to access nfs file systems, you
must turn on the git_system_use_nfs boolean.
setsebool -P git_system_use_nfs 1
If you want to allow qemu to use nfs file system, you must turn on the
qemu_use_nfs boolean.
setsebool -P qemu_use_nfs 1
If you want to allow rsync servers to share nfs files system, you must
turn on the rsync_use_nfs boolean.
setsebool -P rsync_use_nfs 1
If you want to allow Cobbler to access nfs file systems, you must turn
on the cobbler_use_nfs boolean.
setsebool -P cobbler_use_nfs 1
If you want to allow httpd to access nfs file system, you must turn on
the httpd_use_nfs boolean.
setsebool -P httpd_use_nfs 1
If you want to allow sge to access nfs file systems, you must turn on
the sge_use_nfs boolean.
setsebool -P sge_use_nfs 1
If you want to allow any files/directories to be exported read/write
via NFS, you must turn on the nfs_export_all_rw boolean.
setsebool -P nfs_export_all_rw 1
If you want to allow sanlock to manage nfs file, you must turn on the
sanlock_use_nfs boolean.
setsebool -P sanlock_use_nfs 1
If you want to allow samba to export NFS volumes, you must turn on the
samba_share_nfs boolean.
setsebool -P samba_share_nfs 1
If you want to determine whether Polipo can access nfs file systems,
you must turn on the polipo_use_nfs boolean.
setsebool -P polipo_use_nfs 1
If you want to support NFS home directorie, you must turn on the
use_nfs_home_dirs boolean.
setsebool -P use_nfs_home_dirs 1
If you want to allow any files/directories to be exported read/only via
NFS, you must turn on the nfs_export_all_ro boolean.
setsebool -P nfs_export_all_ro 1
NSSWITCH DOMAIN
If you want to allow users to login using a sssd serve for the nfsd_t,
you must turn on the authlogin_nsswitch_use_ldap boolean.
setsebool -P authlogin_nsswitch_use_ldap 1
If you want to allow confined applications to run with kerberos for the
nfsd_t, you must turn on the allow_kerberos boolean.
setsebool -P allow_kerberos 1
If you want to allow system to run with NI for the nfsd_t, you must
turn on the allow_ypbind boolean.
setsebool -P allow_ypbind 1
SHARING FILES
If you want to share files with multiple domains (Apache, FTP, rsync,
Samba), you can set a file context of public_content_t and public_con‐
tent_rw_t. These context allow any of the above domains to read the
content. If you want a particular domain to write to the public_con‐
tent_rw_t domain, you must set the appropriate boolean.
Allow nfsd servers to read the /var/nfsd directory by adding the pub‐
lic_content_t file type to the directory and by restoring the file
type.
semanage fcontext -a -t public_content_t "/var/nfsd(/.*)?"
restorecon -F -R -v /var/nfsd
Allow nfsd servers to read and write /var/tmp/incoming by adding the
public_content_rw_t type to the directory and by restoring the file
type. This also requires the allow_nfsdd_anon_write boolean to be set.
semanage fcontext -a -t public_content_rw_t "/var/nfsd/incoming(/.*)?"
restorecon -F -R -v /var/nfsd/incoming
If you want to allow nfs servers to modify public files used for public
file transfer services. Files/Directories must be labeled public_con‐
tent_rw_t., you must turn on the allow_nfsd_anon_write boolean.
setsebool -P allow_nfsd_anon_write 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 nfsd policy is very flexible allowing users to setup their nfsd
processes in as secure a method as possible.
The following file types are defined for nfsd:
nfsd_exec_t
- Set files with the nfsd_exec_t type, if you want to transition an
executable to the nfsd_t domain.
Paths:
/usr/sbin/rpc.mountd, /usr/sbin/rpc.nfsd
nfsd_initrc_exec_t
- Set files with the nfsd_initrc_exec_t type, if you want to transition
an executable to the nfsd_initrc_t domain.
nfsd_ro_t
- Set files with the nfsd_ro_t type, if you want to treat the files as
nfsd read/only content.
nfsd_rw_t
- Set files with the nfsd_rw_t type, if you want to treat the files as
nfsd read/write content.
nfsd_unit_file_t
- Set files with the nfsd_unit_file_t type, if you want to treat the
files as nfsd unit content.
Note: File context can be temporarily modified with the chcon command.
If you want to permanantly 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.
PORT TYPES
SELinux defines port types to represent TCP and UDP ports.
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 nfsd policy is very flexible allowing users to setup their nfsd
processes in as secure a method as possible.
The following port types are defined for nfsd:
nfs_port_t
Default Defined Ports:
tcp 2049,20048-20049
udp 2049,20048-20049
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
nfsd policy is very flexible allowing users to setup their nfsd pro‐
cesses in as secure a method as possible.
The following process types are defined for nfsd:
nfsd_t
Note: semanage permissive -a PROCESS_TYPE can be used to make a process
type permissive. Permissive process types are not denied access by
SELinux. AVC messages will still be generated.
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 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 pol‐
icy settings.
AUTHOR
This manual page was autogenerated by genman.py.
SEE ALSOselinux(8), nfsd(8), semanage(8), restorecon(8), chcon(1) , setse‐
bool(8)dwalsh@redhat.com nfsd nfsd_selinux(8)
