smbd_selinux(8) 						SELinux Policy smbd						   smbd_selinux(8)

NAME

       smbd_selinux - Security Enhanced Linux Policy for the smbd processes

DESCRIPTION

       Security-Enhanced Linux secures the smbd processes via flexible mandatory access control.

       The smbd processes execute with the smbd_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 smbd_t

ENTRYPOINTS

       The smbd_t SELinux type can be entered via the smbd_exec_t file type.

       The default entrypoint paths for the smbd_t domain are the following:

       /usr/sbin/smbd

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:

       smbd_t

       Note:  semanage	permissive  -a	smbd_t	can be used to make the process type smbd_t permissive. SELinux does not deny access to permissive
       process types, but the AVC (SELinux denials) messages are still generated.

BOOLEANS

       SELinux policy is customizable based on least access required.  smbd policy is extremely flexible and has several booleans that	allow  you
       to manipulate the policy and run smbd with the tightest access possible.

       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 authlo-
       gin_nsswitch_use_ldap boolean. Disabled by default.

       setsebool -P authlogin_nsswitch_use_ldap 1

       If you want to allow all daemons to write corefiles to /, you must turn on the daemons_dump_core boolean. Disabled by default.

       setsebool -P daemons_dump_core 1

       If you want to enable cluster mode for daemons, you must turn on the daemons_enable_cluster_mode boolean. Enabled by default.

       setsebool -P daemons_enable_cluster_mode 1

       If you want to allow all daemons to use tcp wrappers, you must turn on the daemons_use_tcp_wrapper boolean. Disabled by default.

       setsebool -P daemons_use_tcp_wrapper 1

       If you want to allow all daemons the ability to read/write terminals, you must turn on the daemons_use_tty boolean. Disabled by default.

       setsebool -P daemons_use_tty 1

       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 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. Disabled by default.

       setsebool -P nscd_use_shm 1

       If you want to allow samba to create new home directories (e.g. via PAM), you must turn on the samba_create_home_dirs boolean. Disabled	by
       default.

       setsebool -P samba_create_home_dirs 1

       If  you want to allow samba to act as the domain controller, add users, groups and change passwords, you must turn on the samba_domain_con-
       troller boolean. Disabled by default.

       setsebool -P samba_domain_controller 1

       If you want to allow samba to share users home directories, you must turn on the samba_enable_home_dirs boolean. Disabled by default.

       setsebool -P samba_enable_home_dirs 1

       If you want to allow samba to share any file/directory read only, you must turn on the samba_export_all_ro boolean. Disabled by default.

       setsebool -P samba_export_all_ro 1

       If you want to allow samba to share any file/directory read/write, you must turn on the samba_export_all_rw boolean. Disabled by default.

       setsebool -P samba_export_all_rw 1

       If you want to allow samba to act as a portmapper, you must turn on the samba_portmapper boolean. Disabled by default.

       setsebool -P samba_portmapper 1

       If you want to allow samba to run unconfined scripts, you must turn on the samba_run_unconfined boolean. Disabled by default.

       setsebool -P samba_run_unconfined 1

       If you want to allow samba to export ntfs/fusefs volumes, you must turn on the samba_share_fusefs boolean. Disabled by default.

       setsebool -P samba_share_fusefs 1

       If you want to allow samba to export NFS volumes, you must turn on the samba_share_nfs boolean. Disabled by default.

       setsebool -P samba_share_nfs 1

NSSWITCH DOMAIN

       If you want to allow users to resolve user passwd entries directly from ldap rather then using a sssd server for the smbd_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 smbd_t, you must turn on the kerberos_enabled boolean.

       setsebool -P kerberos_enabled 1

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

MANAGED FILES

       The SELinux process type smbd_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_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/cpglockd.pid
	    /var/run/corosync.pid
	    /var/run/rgmanager.pid
	    /var/run/cluster/rgmanager.sk

       non_security_file_type

       noxattrfs

	    all files on file systems which do not support extended attributes

       user_home_type

	    all user home files

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.

       EQUIVALENCE DIRECTORIES

       smbd policy stores data with multiple different file context types under the /var/run/samba 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/samba /srv/samba
       restorecon -R -v /srv/samba

       STANDARD FILE CONTEXT

       SELinux defines the file context types for the smbd, 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 smbd_exec_t '/srv/smbd/content(/.*)?'
       restorecon -R -v /srv/mysmbd_content

       Note: SELinux often uses regular expressions to specify labels that match multiple files.

       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 temporary files in the /tmp directories.

       smbd_tmpfs_t

       - Set files with the smbd_tmpfs_t type, if you want to store smbd files on a tmpfs file system.

       smbd_var_run_t

       - Set files with the smbd_var_run_t type, if you want to store the smbd files under the /run or /var/run directory.

       Paths:
	    /var/run/samba(/.*)?,  /var/run/samba/smbd.pid,  /var/run/samba/brlock.tdb,  /var/run/samba/locking.tdb,  /var/run/samba/gencache.tdb,
	    /var/run/samba/sessionid.tdb, /var/run/samba/share_info.tdb, /var/run/samba/connections.tdb

       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.

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 pub-
       lic_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  pub-
       lic_content_rw_t domain, you must set the appropriate boolean.

       Allow  smbd  servers  to  read  the /var/smbd 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/smbd(/.*)?"
       restorecon -F -R -v /var/smbd

       Allow smbd servers to read and write /var/smbd/incoming by adding the public_content_rw_t type to the directory and by restoring  the  file
       type.  You also need to turn on the smbd_anon_write boolean.

       semanage fcontext -a -t public_content_rw_t "/var/smbd/incoming(/.*)?"
       restorecon -F -R -v /var/smbd/incoming
       setsebool -P smbd_anon_write 1

       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 smbd_anon_write boolean.

       setsebool -P smbd_anon_write 1

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 GUI tool available to customize SELinux policy settings.

AUTHOR

       This manual page was auto-generated using sepolicy manpage .

SEE ALSO

       selinux(8), smbd(8), semanage(8), restorecon(8), chcon(1), sepolicy(8) , setsebool(8)

smbd								     14-06-10							   smbd_selinux(8)