Content-type: text/html Manpage of nfsd_selinux

nfsd_selinux

Section: nfsd SELinux Policy documentation (8)
Updated: nfsd
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NAME

nfsd_selinux - Security Enhanced Linux Policy for the nfsd processes

DESCRIPTION

Security-Enhanced Linux secures the nfsd processes via flexible mandatory 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 files, 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 files, you must turn on the virt_use_nfs boolean.

setsebool -P virt_use_nfs 1

If you want to determine whether Git system daemon can 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 systems, you must turn on the qemu_use_nfs boolean.

setsebool -P qemu_use_nfs 1

If you want to determine whether Git CGI can access nfs file systems, you must turn on the git_cgi_use_nfs boolean.

setsebool -P git_cgi_use_nfs 1

If you want to allow rsync servers to share nfs files systems, you must turn on the rsync_use_nfs boolean.

setsebool -P rsync_use_nfs 1

If you want to support NFS home directories, you must turn on the use_nfs_home_dirs boolean.

setsebool -P use_nfs_home_dirs 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 systems, 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 files, 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 allow ftp servers to use nfs used for public file transfer services, you must turn on the ftpd_use_nfs boolean.

setsebool -P ftpd_use_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 allow the portage domains to use NFS mounts (regular nfs_t), you must turn on the portage_use_nfs boolean.

setsebool -P portage_use_nfs 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 resolve user passwd entries directly from ldap rather then 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 kerberos_enabled boolean.

setsebool -P kerberos_enabled 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_content_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_content_rw_t domain, you must set the appropriate boolean.

Allow nfsd servers to read the /var/nfsd directory by adding the public_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_content_rw_t., you must turn on the nfsd_anon_write boolean.

setsebool -P 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 lsP 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 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.

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 psP Policy governs the access confined processes have to files. SELinux nfsd policy is very flexible allowing users to setup their nfsd processes 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.

MANAGED FILES

The SELinux user type nfsd_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.

nfsd_fs_t

var_lib_nfs_t

/var/lib/nfs(/.*)?

var_lib_t

/opt/(.*/)?var/lib(/.*)?

/var/lib(/.*)?

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 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

This document was created by man2html, using the manual pages.
Time: 19:33:13 GMT, September 30, 2012