smbd_selinux(8) smbd SELinux Policy documentation smbd_selinux(8)NAMEsmbd_selinux - Security Enhanced Linux Policy for the smbd processes
DESCRIPTION
Security-Enhanced Linux secures the smbd processes via flexible manda‐
tory access control.
NSSWITCH DOMAIN
If you want to allow users to login using a sssd serve for the smb‐
mount_t, smbd_t, you must turn on the authlogin_nsswitch_use_ldap bool‐
ean.
setsebool -P authlogin_nsswitch_use_ldap 1
If you want to allow confined applications to run with kerberos for the
smbmount_t, smbd_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 smbmount_t, smbd_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 smbd servers to read the /var/smbd 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/smbd(/.*)?"
restorecon -F -R -v /var/smbd
Allow smbd 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_smbdd_anon_write boolean to be set.
semanage fcontext -a -t public_content_rw_t "/var/smbd/incoming(/.*)?"
restorecon -F -R -v /var/smbd/incoming
If you want to allow samba 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_smbd_anon_write boolean.
setsebool -P allow_smbd_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 smbd policy is very flexible allowing users to setup their smbd
processes in as secure a method as possible.
The following file types are defined for smbd:
smbd_exec_t
- Set files with the smbd_exec_t type, if you want to transition an
executable to the smbd_t domain.
smbd_keytab_t
- Set files with the smbd_keytab_t type, if you want to treat the files
as kerberos keytab files.
smbd_tmp_t
- Set files with the smbd_tmp_t type, if you want to store smbd tempo‐
rary files in the /tmp directories.
smbd_var_run_t
- Set files with the smbd_var_run_t type, if you want to store the smbd
files under the /run directory.
Paths:
/var/run/samba/gencache.tdb, /var/run/samba/share_info.tdb,
/var/run/samba(/.*)?, /var/run/samba/locking.tdb,
/var/run/samba/connections.tdb, /var/run/samba/smbd.pid,
/var/run/samba/sessionid.tdb, /var/run/samba/brlock.tdb
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 smbd policy is very flexible allowing users to setup their smbd
processes in as secure a method as possible.
The following port types are defined for smbd:
smbd_port_t
Default Defined Ports:
tcp 137-139,445
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
smbd policy is very flexible allowing users to setup their smbd pro‐
cesses in as secure a method as possible.
The following process types are defined for smbd:
smbcontrol_t, smbmount_t, smbd_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
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), smbd(8), semanage(8), restorecon(8), chcon(1)dwalsh@redhat.com smbd smbd_selinux(8)
