1nfsd_selinux(8) SELinux Policy nfsd nfsd_selinux(8)
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6 nfsd_selinux - Security Enhanced Linux Policy for the nfsd processes
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9 Security-Enhanced Linux secures the nfsd processes via flexible manda‐
10 tory access control.
11 The nfsd processes execute with the nfsd_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 nfsd_t
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23 The nfsd_t SELinux type can be entered via the nfsd_exec_t file type.
24 The default entrypoint paths for the nfsd_t domain are the following:
26 /usr/sbin/rpc.nfsd, /usr/sbin/rpc.mountd
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 nfsd policy is very flexible allowing users to setup their nfsd pro‐
37 cesses in as secure a method as possible.
38 The following process types are defined for nfsd:
40 nfsd_t
42 Note: semanage permissive -a nfsd_t can be used to make the process
44 type nfsd_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. nfsd
51 policy is extremely flexible and has several booleans that allow you to
52 manipulate the policy and run nfsd with the tightest access possible.
53 If you want to allow any files/directories to be exported read/only via
57 NFS, you must turn on the nfs_export_all_ro boolean. Enabled by
58 default.
59 setsebool -P nfs_export_all_ro 1
61 If you want to allow any files/directories to be exported read/write
65 via NFS, you must turn on the nfs_export_all_rw boolean. Enabled by
66 default.
67 setsebool -P nfs_export_all_rw 1
69 If you want to allow users to resolve user passwd entries directly from
73 ldap rather then using a sssd server, you must turn on the authlo‐
74 gin_nsswitch_use_ldap boolean. Disabled by default.
75 setsebool -P authlogin_nsswitch_use_ldap 1
77 If you want to allow all daemons to write corefiles to /, you must turn
81 on the daemons_dump_core boolean. Disabled by default.
82 setsebool -P daemons_dump_core 1
84 If you want to enable cluster mode for daemons, you must turn on the
88 daemons_enable_cluster_mode boolean. Enabled by default.
89 setsebool -P daemons_enable_cluster_mode 1
91 If you want to allow all daemons to use tcp wrappers, you must turn on
95 the daemons_use_tcp_wrapper boolean. Disabled by default.
96 setsebool -P daemons_use_tcp_wrapper 1
98 If you want to allow all daemons the ability to read/write terminals,
102 you must turn on the daemons_use_tty boolean. Disabled by default.
103 setsebool -P daemons_use_tty 1
105 If you want to deny any process from ptracing or debugging any other
109 processes, you must turn on the deny_ptrace boolean. Enabled by
110 default.
111 setsebool -P deny_ptrace 1
113 If you want to allow any process to mmap any file on system with
117 attribute file_type, you must turn on the domain_can_mmap_files bool‐
118 ean. Enabled by default.
119 setsebool -P domain_can_mmap_files 1
121 If you want to allow all domains write to kmsg_device, while kernel is
125 executed with systemd.log_target=kmsg parameter, you must turn on the
126 domain_can_write_kmsg boolean. Disabled by default.
127 setsebool -P domain_can_write_kmsg 1
129 If you want to allow all domains to use other domains file descriptors,
133 you must turn on the domain_fd_use boolean. Enabled by default.
134 setsebool -P domain_fd_use 1
136 If you want to allow all domains to have the kernel load modules, you
140 must turn on the domain_kernel_load_modules boolean. Disabled by
141 default.
142 setsebool -P domain_kernel_load_modules 1
144 If you want to allow all domains to execute in fips_mode, you must turn
148 on the fips_mode boolean. Enabled by default.
149 setsebool -P fips_mode 1
151 If you want to enable reading of urandom for all domains, you must turn
155 on the global_ssp boolean. Disabled by default.
156 setsebool -P global_ssp 1
158 If you want to allow confined applications to run with kerberos, you
162 must turn on the kerberos_enabled boolean. Enabled by default.
163 setsebool -P kerberos_enabled 1
165 If you want to allow system to run with NIS, you must turn on the
169 nis_enabled boolean. Disabled by default.
170 setsebool -P nis_enabled 1
172 If you want to allow confined applications to use nscd shared memory,
176 you must turn on the nscd_use_shm boolean. Disabled by default.
177 setsebool -P nscd_use_shm 1
179
183 SELinux defines port types to represent TCP and UDP ports.
184 You can see the types associated with a port by using the following
186 command:
187 semanage port -l
189 Policy governs the access confined processes have to these ports.
192 SELinux nfsd policy is very flexible allowing users to setup their nfsd
193 processes in as secure a method as possible.
194 The following port types are defined for nfsd:
196 nfs_port_t
199 Default Defined Ports:
203 tcp 2049,20048-20049
204 udp 2049,20048-20049
205
207 The SELinux process type nfsd_t can manage files labeled with the fol‐
208 lowing file types. The paths listed are the default paths for these
209 file types. Note the processes UID still need to have DAC permissions.
210 cluster_conf_t
212 /etc/cluster(/.*)?
214 cluster_var_lib_t
216 /var/lib/pcsd(/.*)?
218 /var/lib/cluster(/.*)?
219 /var/lib/openais(/.*)?
220 /var/lib/pengine(/.*)?
221 /var/lib/corosync(/.*)?
222 /usr/lib/heartbeat(/.*)?
223 /var/lib/heartbeat(/.*)?
224 /var/lib/pacemaker(/.*)?
225 cluster_var_run_t
227 /var/run/crm(/.*)?
229 /var/run/cman_.*
230 /var/run/rsctmp(/.*)?
231 /var/run/aisexec.*
232 /var/run/heartbeat(/.*)?
233 /var/run/corosync-qnetd(/.*)?
234 /var/run/corosync-qdevice(/.*)?
235 /var/run/cpglockd.pid
236 /var/run/corosync.pid
237 /var/run/rgmanager.pid
238 /var/run/cluster/rgmanager.sk
239 mount_var_run_t
241 /run/mount(/.*)?
243 /dev/.mount(/.*)?
244 /var/run/mount(/.*)?
245 /var/run/davfs2(/.*)?
246 /var/cache/davfs2(/.*)?
247 nfsd_fs_t
249 public_content_rw_t
252 /var/spool/abrt-upload(/.*)?
254 root_t
256 /sysroot/ostree/deploy/.*-atomic.*/deploy(/.*)?
258 /
259 /initrd
260 var_lib_nfs_t
262 /var/lib/nfs(/.*)?
264 var_lib_t
266 /opt/(.*/)?var/lib(/.*)?
268 /var/lib(/.*)?
269
272 SELinux requires files to have an extended attribute to define the file
273 type.
274 You can see the context of a file using the -Z option to ls
276 Policy governs the access confined processes have to these files.
278 SELinux nfsd policy is very flexible allowing users to setup their nfsd
279 processes in as secure a method as possible.
280 STANDARD FILE CONTEXT
282 SELinux defines the file context types for the nfsd, if you wanted to
284 store files with these types in a diffent paths, you need to execute
285 the semanage command to sepecify alternate labeling and then use
286 restorecon to put the labels on disk.
287 semanage fcontext -a -t nfsd_unit_file_t '/srv/mynfsd_content(/.*)?'
289 restorecon -R -v /srv/mynfsd_content
290 Note: SELinux often uses regular expressions to specify labels that
292 match multiple files.
293 The following file types are defined for nfsd:
295 nfsd_exec_t
299 - Set files with the nfsd_exec_t type, if you want to transition an
301 executable to the nfsd_t domain.
302 Paths:
305 /usr/sbin/rpc.nfsd, /usr/sbin/rpc.mountd
306 nfsd_fs_t
309 - Set files with the nfsd_fs_t type, if you want to treat the files as
311 nfsd fs data.
312 nfsd_initrc_exec_t
316 - Set files with the nfsd_initrc_exec_t type, if you want to transition
318 an executable to the nfsd_initrc_t domain.
319 nfsd_unit_file_t
323 - Set files with the nfsd_unit_file_t type, if you want to treat the
325 files as nfsd unit content.
326 Note: File context can be temporarily modified with the chcon command.
330 If you want to permanently change the file context you need to use the
331 semanage fcontext command. This will modify the SELinux labeling data‐
332 base. You will need to use restorecon to apply the labels.
333
336 If you want to share files with multiple domains (Apache, FTP, rsync,
337 Samba), you can set a file context of public_content_t and public_con‐
338 tent_rw_t. These context allow any of the above domains to read the
339 content. If you want a particular domain to write to the public_con‐
340 tent_rw_t domain, you must set the appropriate boolean.
341 Allow nfsd servers to read the /var/nfsd directory by adding the pub‐
343 lic_content_t file type to the directory and by restoring the file
344 type.
345 semanage fcontext -a -t public_content_t "/var/nfsd(/.*)?"
347 restorecon -F -R -v /var/nfsd
348 Allow nfsd servers to read and write /var/nfsd/incoming by adding the
350 public_content_rw_t type to the directory and by restoring the file
351 type. You also need to turn on the nfsd_anon_write boolean.
352 semanage fcontext -a -t public_content_rw_t "/var/nfsd/incoming(/.*)?"
354 restorecon -F -R -v /var/nfsd/incoming
355 setsebool -P nfsd_anon_write 1
356 If you want to allow nfs servers to modify public files used for public
359 file transfer services. Files/Directories must be labeled public_con‐
360 tent_rw_t., you must turn on the nfsd_anon_write boolean.
361 setsebool -P nfsd_anon_write 1
363
366 semanage fcontext can also be used to manipulate default file context
367 mappings.
368 semanage permissive can also be used to manipulate whether or not a
370 process type is permissive.
371 semanage module can also be used to enable/disable/install/remove pol‐
373 icy modules.
374 semanage port can also be used to manipulate the port definitions
376 semanage boolean can also be used to manipulate the booleans
378 system-config-selinux is a GUI tool available to customize SELinux pol‐
381 icy settings.
382
385 This manual page was auto-generated using sepolicy manpage .
386
389 selinux(8), nfsd(8), semanage(8), restorecon(8), chcon(1), sepolicy(8)
390 , setsebool(8)
391nfsd 19-04-25 nfsd_selinux(8)