sshd_selinux(8)

1sshd_selinux(8)               SELinux Policy sshd              sshd_selinux(8)
2
3
4

NAME

6       sshd_selinux - Security Enhanced Linux Policy for the sshd processes
7

DESCRIPTION

9       Security-Enhanced  Linux secures the sshd processes via flexible manda‐
10       tory access control.
11
12       The sshd processes execute with the sshd_t SELinux type. You can  check
13       if  you  have  these processes running by executing the ps command with
14       the -Z qualifier.
15
16       For example:
17
18       ps -eZ | grep sshd_t
19
20
21

ENTRYPOINTS

23       The sshd_t SELinux type can be entered via the sshd_exec_t file type.
24
25       The default entrypoint paths for the sshd_t domain are the following:
26
27       /usr/sbin/sshd, /usr/sbin/gsisshd
28

PROCESS TYPES

30       SELinux defines process types (domains) for each process running on the
31       system
32
33       You can see the context of a process using the -Z option to ps
34
35       Policy  governs  the  access confined processes have to files.  SELinux
36       sshd policy is very flexible allowing users to setup  their  sshd  pro‐
37       cesses in as secure a method as possible.
38
39       The following process types are defined for sshd:
40
41       sshd_t, sshd_sandbox_t, sshd_net_t, ssh_keygen_t, sshd_keygen_t, ssh_t, ssh_keysign_t
42
43       Note:  semanage  permissive  -a  sshd_t can be used to make the process
44       type sshd_t permissive. SELinux does  not  deny  access  to  permissive
45       process  types, but the AVC (SELinux denials) messages are still gener‐
46       ated.
47
48

BOOLEANS

50       SELinux policy is customizable based on least  access  required.   sshd
51       policy is extremely flexible and has several booleans that allow you to
52       manipulate the policy and run sshd with the tightest access possible.
53
54
55
56       If you want to allow ssh logins as sysadm_r:sysadm_t, you must turn  on
57       the ssh_sysadm_login boolean. Disabled by default.
58
59       setsebool -P ssh_sysadm_login 1
60
61
62
63       If  you  want  to  allow sshd to use tcp wrappers, you must turn on the
64       ssh_use_tcpd boolean. Disabled by default.
65
66       setsebool -P ssh_use_tcpd 1
67
68
69
70       If you want to allow users to resolve user passwd entries directly from
71       ldap  rather  then  using  a  sssd server, you must turn on the authlo‐
72       gin_nsswitch_use_ldap boolean. Disabled by default.
73
74       setsebool -P authlogin_nsswitch_use_ldap 1
75
76
77
78       If you want to allow all domains to execute in fips_mode, you must turn
79       on the fips_mode boolean. Enabled by default.
80
81       setsebool -P fips_mode 1
82
83
84
85       If  you  want  to allow confined applications to run with kerberos, you
86       must turn on the kerberos_enabled boolean. Enabled by default.
87
88       setsebool -P kerberos_enabled 1
89
90
91
92       If you want to allow system to run with  NIS,  you  must  turn  on  the
93       nis_enabled boolean. Disabled by default.
94
95       setsebool -P nis_enabled 1
96
97
98
99       If  you  want to allow confined applications to use nscd shared memory,
100       you must turn on the nscd_use_shm boolean. Disabled by default.
101
102       setsebool -P nscd_use_shm 1
103
104
105
106       If you want to enable polyinstantiated directory support, you must turn
107       on the polyinstantiation_enabled boolean. Disabled by default.
108
109       setsebool -P polyinstantiation_enabled 1
110
111
112

PORT TYPES

114       SELinux defines port types to represent TCP and UDP ports.
115
116       You  can  see  the  types associated with a port by using the following
117       command:
118
119       semanage port -l
120
121
122       Policy governs the access  confined  processes  have  to  these  ports.
123       SELinux sshd policy is very flexible allowing users to setup their sshd
124       processes in as secure a method as possible.
125
126       The following port types are defined for sshd:
127
128
129       ssh_port_t
130
131
132
133       Default Defined Ports:
134                 tcp 22
135

MANAGED FILES

137       The SELinux process type sshd_t can manage files labeled with the  fol‐
138       lowing  file  types.   The paths listed are the default paths for these
139       file types.  Note the processes UID still need to have DAC permissions.
140
141       auth_cache_t
142
143            /var/cache/coolkey(/.*)?
144
145       auth_home_t
146
147            /root/.yubico(/.*)?
148            /root/.google_authenticator
149            /root/.google_authenticator~
150            /home/[^/]+/.yubico(/.*)?
151            /home/[^/]+/.google_authenticator
152            /home/[^/]+/.google_authenticator~
153
154       cgroup_t
155
156            /sys/fs/cgroup
157
158       cifs_t
159
160
161       cluster_conf_t
162
163            /etc/cluster(/.*)?
164
165       cluster_var_lib_t
166
167            /var/lib/pcsd(/.*)?
168            /var/lib/cluster(/.*)?
169            /var/lib/openais(/.*)?
170            /var/lib/pengine(/.*)?
171            /var/lib/corosync(/.*)?
172            /usr/lib/heartbeat(/.*)?
173            /var/lib/heartbeat(/.*)?
174            /var/lib/pacemaker(/.*)?
175
176       cluster_var_run_t
177
178            /var/run/crm(/.*)?
179            /var/run/cman_.*
180            /var/run/rsctmp(/.*)?
181            /var/run/aisexec.*
182            /var/run/heartbeat(/.*)?
183            /var/run/corosync-qnetd(/.*)?
184            /var/run/corosync-qdevice(/.*)?
185            /var/run/corosync.pid
186            /var/run/cpglockd.pid
187            /var/run/rgmanager.pid
188            /var/run/cluster/rgmanager.sk
189
190       condor_var_lib_t
191
192            /var/lib/condor(/.*)?
193            /var/lib/condor/spool(/.*)?
194            /var/lib/condor/execute(/.*)?
195
196       ecryptfs_t
197
198            /home/[^/]+/.Private(/.*)?
199            /home/[^/]+/.ecryptfs(/.*)?
200
201       faillog_t
202
203            /var/log/btmp.*
204            /var/log/faillog.*
205            /var/log/tallylog.*
206            /var/run/faillock(/.*)?
207
208       fusefs_t
209
210            /var/run/user/[^/]*/gvfs
211
212       gitosis_var_lib_t
213
214            /srv/lib/gitosis(/.*)?
215            /var/lib/gitosis(/.*)?
216            /var/lib/gitolite(3)?(/.*)?
217
218       initrc_var_run_t
219
220            /var/run/utmp
221            /var/run/random-seed
222            /var/run/runlevel.dir
223            /var/run/setmixer_flag
224
225       kdbusfs_t
226
227
228       krb5_host_rcache_t
229
230            /var/cache/krb5rcache(/.*)?
231            /var/tmp/nfs_0
232            /var/tmp/DNS_25
233            /var/tmp/host_0
234            /var/tmp/imap_0
235            /var/tmp/HTTP_23
236            /var/tmp/HTTP_48
237            /var/tmp/ldap_55
238            /var/tmp/ldap_487
239            /var/tmp/ldapmap1_0
240
241       lastlog_t
242
243            /var/log/lastlog.*
244
245       nfs_t
246
247
248       openshift_tmp_t
249
250            /var/lib/openshift/.*/.tmp(/.*)?
251            /var/lib/openshift/.*/.sandbox(/.*)?
252            /var/lib/stickshift/.*/.tmp(/.*)?
253            /var/lib/stickshift/.*/.sandbox(/.*)?
254
255       pam_var_run_t
256
257            /var/(db|adm)/sudo(/.*)?
258            /var/lib/sudo(/.*)?
259            /var/run/sudo(/.*)?
260            /var/run/motd.d(/.*)?
261            /var/run/sepermit(/.*)?
262            /var/run/pam_mount(/.*)?
263            /var/run/motd
264
265       root_t
266
267            /sysroot/ostree/deploy/.*-atomic/deploy(/.*)?
268            /
269            /initrd
270
271       security_t
272
273            /selinux
274
275       ssh_home_t
276
277            /var/lib/[^/]+/.ssh(/.*)?
278            /root/.ssh(/.*)?
279            /var/lib/one/.ssh(/.*)?
280            /var/lib/pgsql/.ssh(/.*)?
281            /var/lib/openshift/[^/]+/.ssh(/.*)?
282            /var/lib/amanda/.ssh(/.*)?
283            /var/lib/stickshift/[^/]+/.ssh(/.*)?
284            /var/lib/gitolite/.ssh(/.*)?
285            /var/lib/nocpulse/.ssh(/.*)?
286            /var/lib/gitolite3/.ssh(/.*)?
287            /var/lib/openshift/gear/[^/]+/.ssh(/.*)?
288            /root/.shosts
289            /home/[^/]+/.ssh(/.*)?
290            /home/[^/]+/.ansible/cp/.*
291            /home/[^/]+/.shosts
292
293       sshd_var_run_t
294
295            /var/run/sshd.pid
296            /var/run/sshd.init.pid
297
298       systemd_passwd_var_run_t
299
300            /var/run/systemd/ask-password(/.*)?
301            /var/run/systemd/ask-password-block(/.*)?
302
303       user_tmp_t
304
305            /dev/shm/mono.*
306            /var/run/user(/.*)?
307            /tmp/.ICE-unix(/.*)?
308            /tmp/.X11-unix(/.*)?
309            /dev/shm/pulse-shm.*
310            /tmp/.X0-lock
311            /tmp/hsperfdata_root
312            /var/tmp/hsperfdata_root
313            /home/[^/]+/tmp
314            /home/[^/]+/.tmp
315            /tmp/gconfd-[^/]+
316
317       user_tmp_type
318
319            all user tmp files
320
321       var_auth_t
322
323            /var/ace(/.*)?
324            /var/rsa(/.*)?
325            /var/lib/abl(/.*)?
326            /var/lib/rsa(/.*)?
327            /var/lib/pam_ssh(/.*)?
328            /var/run/pam_ssh(/.*)?
329            /var/lib/pam_shield(/.*)?
330            /var/opt/quest/vas/vasd(/.*)?
331            /var/lib/google-authenticator(/.*)?
332
333       wtmp_t
334
335            /var/log/wtmp.*
336
337

FILE CONTEXTS

339       SELinux requires files to have an extended attribute to define the file
340       type.
341
342       You can see the context of a file using the -Z option to ls
343
344       Policy  governs  the  access  confined  processes  have to these files.
345       SELinux sshd policy is very flexible allowing users to setup their sshd
346       processes in as secure a method as possible.
347
348       STANDARD FILE CONTEXT
349
350       SELinux  defines  the file context types for the sshd, if you wanted to
351       store files with these types in a diffent paths, you  need  to  execute
352       the  semanage  command  to  sepecify  alternate  labeling  and then use
353       restorecon to put the labels on disk.
354
355       semanage fcontext -a -t sshd_keytab_t '/srv/mysshd_content(/.*)?'
356       restorecon -R -v /srv/mysshd_content
357
358       Note: SELinux often uses regular expressions  to  specify  labels  that
359       match multiple files.
360
361       The following file types are defined for sshd:
362
363
364
365       sshd_exec_t
366
367       -  Set  files  with  the sshd_exec_t type, if you want to transition an
368       executable to the sshd_t domain.
369
370
371       Paths:
372            /usr/sbin/sshd, /usr/sbin/gsisshd
373
374
375       sshd_initrc_exec_t
376
377       - Set files with the sshd_initrc_exec_t type, if you want to transition
378       an executable to the sshd_initrc_t domain.
379
380
381
382       sshd_key_t
383
384       - Set files with the sshd_key_t type, if you want to treat the files as
385       sshd key data.
386
387
388       Paths:
389            /etc/ssh/ssh_host.*_key,              /etc/ssh/ssh_host.*_key.pub,
390            /etc/ssh/primes
391
392
393       sshd_keygen_exec_t
394
395       - Set files with the sshd_keygen_exec_t type, if you want to transition
396       an executable to the sshd_keygen_t domain.
397
398
399       Paths:
400            /usr/sbin/sshd-keygen, /usr/libexec/openssh/sshd-keygen
401
402
403       sshd_keygen_unit_file_t
404
405       - Set files with the sshd_keygen_unit_file_t type, if you want to treat
406       the files as sshd keygen unit content.
407
408
409
410       sshd_keytab_t
411
412       - Set files with the sshd_keytab_t type, if you want to treat the files
413       as kerberos keytab files.
414
415
416
417       sshd_tmpfs_t
418
419       - Set files with the sshd_tmpfs_t type, if you want to store sshd files
420       on a tmpfs file system.
421
422
423
424       sshd_unit_file_t
425
426       -  Set  files  with the sshd_unit_file_t type, if you want to treat the
427       files as sshd unit content.
428
429
430
431       sshd_var_run_t
432
433       - Set files with the sshd_var_run_t type, if you want to store the sshd
434       files under the /run or /var/run directory.
435
436
437       Paths:
438            /var/run/sshd.pid, /var/run/sshd.init.pid
439
440
441       Note:  File context can be temporarily modified with the chcon command.
442       If you want to permanently change the file context you need to use  the
443       semanage fcontext command.  This will modify the SELinux labeling data‐
444       base.  You will need to use restorecon to apply the labels.
445
446

COMMANDS

448       semanage fcontext can also be used to manipulate default  file  context
449       mappings.
450
451       semanage  permissive  can  also  be used to manipulate whether or not a
452       process type is permissive.
453
454       semanage module can also be used to enable/disable/install/remove  pol‐
455       icy modules.
456
457       semanage port can also be used to manipulate the port definitions
458
459       semanage boolean can also be used to manipulate the booleans
460
461
462       system-config-selinux is a GUI tool available to customize SELinux pol‐
463       icy settings.
464
465

AUTHOR

467       This manual page was auto-generated using sepolicy manpage .
468
469