1smbd_selinux(8) SELinux Policy smbd smbd_selinux(8)
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6 smbd_selinux - Security Enhanced Linux Policy for the smbd processes
7
9 Security-Enhanced Linux secures the smbd processes via flexible manda‐
10 tory access control.
11 The smbd processes execute with the smbd_t SELinux type. You can check
13 if you have these processes running by executing the ps command with
14 the -Z qualifier.
15 For example:
17 ps -eZ | grep smbd_t
19
23 The smbd_t SELinux type can be entered via the smbd_exec_t file type.
24 The default entrypoint paths for the smbd_t domain are the following:
26 /usr/sbin/smbd
28
30 SELinux defines process types (domains) for each process running on the
31 system
32 You can see the context of a process using the -Z option to ps
34 Policy governs the access confined processes have to files. SELinux
36 smbd policy is very flexible allowing users to setup their smbd pro‐
37 cesses in as secure a method as possible.
38 The following process types are defined for smbd:
40 smbd_t
42 Note: semanage permissive -a smbd_t can be used to make the process
44 type smbd_t permissive. SELinux does not deny access to permissive
45 process types, but the AVC (SELinux denials) messages are still gener‐
46 ated.
47
50 SELinux policy is customizable based on least access required. smbd
51 policy is extremely flexible and has several booleans that allow you to
52 manipulate the policy and run smbd with the tightest access possible.
53 If you want to allow users to resolve user passwd entries directly from
57 ldap rather then using a sssd server, you must turn on the authlo‐
58 gin_nsswitch_use_ldap boolean. Disabled by default.
59 setsebool -P authlogin_nsswitch_use_ldap 1
61 If you want to allow all domains to execute in fips_mode, you must turn
65 on the fips_mode boolean. Enabled by default.
66 setsebool -P fips_mode 1
68 If you want to allow confined applications to run with kerberos, you
72 must turn on the kerberos_enabled boolean. Enabled by default.
73 setsebool -P kerberos_enabled 1
75 If you want to allow system to run with NIS, you must turn on the
79 nis_enabled boolean. Disabled by default.
80 setsebool -P nis_enabled 1
82 If you want to allow confined applications to use nscd shared memory,
86 you must turn on the nscd_use_shm boolean. Disabled by default.
87 setsebool -P nscd_use_shm 1
89 If you want to allow samba to create new home directories (e.g. via
93 PAM), you must turn on the samba_create_home_dirs boolean. Disabled by
94 default.
95 setsebool -P samba_create_home_dirs 1
97 If you want to allow samba to act as the domain controller, add users,
101 groups and change passwords, you must turn on the samba_domain_con‐
102 troller boolean. Disabled by default.
103 setsebool -P samba_domain_controller 1
105 If you want to allow samba to share users home directories, you must
109 turn on the samba_enable_home_dirs boolean. Disabled by default.
110 setsebool -P samba_enable_home_dirs 1
112 If you want to allow samba to share any file/directory read only, you
116 must turn on the samba_export_all_ro boolean. Disabled by default.
117 setsebool -P samba_export_all_ro 1
119 If you want to allow samba to share any file/directory read/write, you
123 must turn on the samba_export_all_rw boolean. Disabled by default.
124 setsebool -P samba_export_all_rw 1
126 If you want to allow smbd to load libgfapi from gluster, you must turn
130 on the samba_load_libgfapi boolean. Disabled by default.
131 setsebool -P samba_load_libgfapi 1
133 If you want to allow samba to act as a portmapper, you must turn on the
137 samba_portmapper boolean. Disabled by default.
138 setsebool -P samba_portmapper 1
140 If you want to allow samba to run unconfined scripts, you must turn on
144 the samba_run_unconfined boolean. Enabled by default.
145 setsebool -P samba_run_unconfined 1
147 If you want to allow samba to export ntfs/fusefs volumes, you must turn
151 on the samba_share_fusefs boolean. Enabled by default.
152 setsebool -P samba_share_fusefs 1
154 If you want to allow samba to export NFS volumes, you must turn on the
158 samba_share_nfs boolean. Disabled by default.
159 setsebool -P samba_share_nfs 1
161
165 SELinux defines port types to represent TCP and UDP ports.
166 You can see the types associated with a port by using the following
168 command:
169 semanage port -l
171 Policy governs the access confined processes have to these ports.
174 SELinux smbd policy is very flexible allowing users to setup their smbd
175 processes in as secure a method as possible.
176 The following port types are defined for smbd:
178 smbd_port_t
181 Default Defined Ports:
185 tcp 445,137-139
186
188 The SELinux process type smbd_t can manage files labeled with the fol‐
189 lowing file types. The paths listed are the default paths for these
190 file types. Note the processes UID still need to have DAC permissions.
191 auth_cache_t
193 /var/cache/coolkey(/.*)?
195 cluster_conf_t
197 /etc/cluster(/.*)?
199 cluster_var_lib_t
201 /var/lib/pcsd(/.*)?
203 /var/lib/cluster(/.*)?
204 /var/lib/openais(/.*)?
205 /var/lib/pengine(/.*)?
206 /var/lib/corosync(/.*)?
207 /usr/lib/heartbeat(/.*)?
208 /var/lib/heartbeat(/.*)?
209 /var/lib/pacemaker(/.*)?
210 cluster_var_run_t
212 /var/run/crm(/.*)?
214 /var/run/cman_.*
215 /var/run/rsctmp(/.*)?
216 /var/run/aisexec.*
217 /var/run/heartbeat(/.*)?
218 /var/run/corosync-qnetd(/.*)?
219 /var/run/corosync-qdevice(/.*)?
220 /var/run/corosync.pid
221 /var/run/cpglockd.pid
222 /var/run/rgmanager.pid
223 /var/run/cluster/rgmanager.sk
224 ctdbd_var_lib_t
226 /var/lib/ctdb(/.*)?
228 /var/lib/ctdbd(/.*)?
229 faillog_t
231 /var/log/btmp.*
233 /var/log/faillog.*
234 /var/log/tallylog.*
235 /var/run/faillock(/.*)?
236 fusefs_t
238 /var/run/user/[^/]*/gvfs
240 glusterd_var_lib_t
242 /var/lib/glusterd(/.*)?
244 glusterd_var_run_t
246 /var/run/gluster(/.*)?
248 /var/run/glusterd.*
249 /var/run/glusterd.*
250 /var/run/glusterd(/.*)?
251 httpd_user_content_t
253 /home/[^/]+/((www)|(web)|(public_html))(/.+)?
255 initrc_var_run_t
257 /var/run/utmp
259 /var/run/random-seed
260 /var/run/runlevel.dir
261 /var/run/setmixer_flag
262 krb5_host_rcache_t
264 /var/cache/krb5rcache(/.*)?
266 /var/tmp/nfs_0
267 /var/tmp/DNS_25
268 /var/tmp/host_0
269 /var/tmp/imap_0
270 /var/tmp/HTTP_23
271 /var/tmp/HTTP_48
272 /var/tmp/ldap_55
273 /var/tmp/ldap_487
274 /var/tmp/ldapmap1_0
275 nfs_t
277 nmbd_var_run_t
280 /var/run/nmbd(/.*)?
282 /var/run/samba/nmbd(/.*)?
283 /var/run/samba/nmbd.pid
284 /var/run/samba/messages.tdb
285 /var/run/samba/namelist.debug
286 /var/run/samba/unexpected.tdb
287 non_security_file_type
289 noxattrfs
292 all files on file systems which do not support extended attributes
294 public_content_rw_t
296 /var/spool/abrt-upload(/.*)?
298 root_t
300 /sysroot/ostree/deploy/.*-atomic/deploy(/.*)?
302 /
303 /initrd
304 samba_etc_t
306 /etc/samba(/.*)?
308 samba_log_t
310 /var/log/samba(/.*)?
312 samba_secrets_t
314 /etc/samba/smbpasswd
316 /etc/samba/passdb.tdb
317 /etc/samba/MACHINE.SID
318 /etc/samba/secrets.tdb
319 samba_share_t
321 use this label for random content that will be shared using samba
323 samba_spool_t
325 /var/spool/samba(/.*)?
327 samba_var_t
329 /var/nmbd(/.*)?
331 /var/lib/samba(/.*)?
332 /var/cache/samba(/.*)?
333 security_t
335 /selinux
337 smbd_tmp_t
339 smbd_tmpfs_t
342 smbd_var_run_t
345 /var/run/samba(/.*)?
347 /var/run/samba/smbd.pid
348 /var/run/samba/brlock.tdb
349 /var/run/samba/locking.tdb
350 /var/run/samba/gencache.tdb
351 /var/run/samba/sessionid.tdb
352 /var/run/samba/share_info.tdb
353 /var/run/samba/connections.tdb
354 user_home_type
356 all user home files
358 wtmp_t
360 /var/log/wtmp.*
362
365 SELinux requires files to have an extended attribute to define the file
366 type.
367 You can see the context of a file using the -Z option to ls
369 Policy governs the access confined processes have to these files.
371 SELinux smbd policy is very flexible allowing users to setup their smbd
372 processes in as secure a method as possible.
373 EQUIVALENCE DIRECTORIES
375 smbd policy stores data with multiple different file context types
378 under the /var/run/samba directory. If you would like to store the
379 data in a different directory you can use the semanage command to cre‐
380 ate an equivalence mapping. If you wanted to store this data under the
381 /srv dirctory you would execute the following command:
382 semanage fcontext -a -e /var/run/samba /srv/samba
384 restorecon -R -v /srv/samba
385 STANDARD FILE CONTEXT
387 SELinux defines the file context types for the smbd, if you wanted to
389 store files with these types in a diffent paths, you need to execute
390 the semanage command to sepecify alternate labeling and then use
391 restorecon to put the labels on disk.
392 semanage fcontext -a -t smbd_var_run_t '/srv/mysmbd_content(/.*)?'
394 restorecon -R -v /srv/mysmbd_content
395 Note: SELinux often uses regular expressions to specify labels that
397 match multiple files.
398 The following file types are defined for smbd:
400 smbd_exec_t
404 - Set files with the smbd_exec_t type, if you want to transition an
406 executable to the smbd_t domain.
407 smbd_keytab_t
411 - Set files with the smbd_keytab_t type, if you want to treat the files
413 as kerberos keytab files.
414 smbd_tmp_t
418 - Set files with the smbd_tmp_t type, if you want to store smbd tempo‐
420 rary files in the /tmp directories.
421 smbd_tmpfs_t
425 - Set files with the smbd_tmpfs_t type, if you want to store smbd files
427 on a tmpfs file system.
428 smbd_var_run_t
432 - Set files with the smbd_var_run_t type, if you want to store the smbd
434 files under the /run or /var/run directory.
435 Paths:
438 /var/run/samba(/.*)?, /var/run/samba/smbd.pid,
439 /var/run/samba/brlock.tdb, /var/run/samba/locking.tdb,
440 /var/run/samba/gencache.tdb, /var/run/samba/sessionid.tdb,
441 /var/run/samba/share_info.tdb, /var/run/samba/connections.tdb
442 Note: File context can be temporarily modified with the chcon command.
445 If you want to permanently change the file context you need to use the
446 semanage fcontext command. This will modify the SELinux labeling data‐
447 base. You will need to use restorecon to apply the labels.
448
451 If you want to share files with multiple domains (Apache, FTP, rsync,
452 Samba), you can set a file context of public_content_t and public_con‐
453 tent_rw_t. These context allow any of the above domains to read the
454 content. If you want a particular domain to write to the public_con‐
455 tent_rw_t domain, you must set the appropriate boolean.
456 Allow smbd servers to read the /var/smbd directory by adding the pub‐
458 lic_content_t file type to the directory and by restoring the file
459 type.
460 semanage fcontext -a -t public_content_t "/var/smbd(/.*)?"
462 restorecon -F -R -v /var/smbd
463 Allow smbd servers to read and write /var/smbd/incoming by adding the
465 public_content_rw_t type to the directory and by restoring the file
466 type. You also need to turn on the smbd_anon_write boolean.
467 semanage fcontext -a -t public_content_rw_t "/var/smbd/incoming(/.*)?"
469 restorecon -F -R -v /var/smbd/incoming
470 setsebool -P smbd_anon_write 1
471 If you want to allow samba to modify public files used for public file
474 transfer services. Files/Directories must be labeled public_con‐
475 tent_rw_t., you must turn on the smbd_anon_write boolean.
476 setsebool -P smbd_anon_write 1
478
481 semanage fcontext can also be used to manipulate default file context
482 mappings.
483 semanage permissive can also be used to manipulate whether or not a
485 process type is permissive.
486 semanage module can also be used to enable/disable/install/remove pol‐
488 icy modules.
489 semanage port can also be used to manipulate the port definitions
491 semanage boolean can also be used to manipulate the booleans
493 system-config-selinux is a GUI tool available to customize SELinux pol‐
496 icy settings.
497
500 This manual page was auto-generated using sepolicy manpage .
501
504 selinux(8), smbd(8), semanage(8), restorecon(8), chcon(1), sepolicy(8),
505 setsebool(8)
506smbd 19-05-30 smbd_selinux(8)