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 users to resolve user passwd entries directly from
64       ldap rather then using a sssd server, you  must  turn  on  the  authlo‐
65       gin_nsswitch_use_ldap boolean. Disabled by default.
66
67       setsebool -P authlogin_nsswitch_use_ldap 1
68
69
70
71       If  you  want  to  allow users to login using a radius server, you must
72       turn on the authlogin_radius boolean. Disabled by default.
73
74       setsebool -P authlogin_radius 1
75
76
77
78       If you want to allow users to login using a yubikey OTP server or chal‐
79       lenge  response  mode,  you must turn on the authlogin_yubikey boolean.
80       Disabled by default.
81
82       setsebool -P authlogin_yubikey 1
83
84
85
86       If you want to allow all daemons to write corefiles to /, you must turn
87       on the daemons_dump_core boolean. Disabled by default.
88
89       setsebool -P daemons_dump_core 1
90
91
92
93       If  you  want  to enable cluster mode for daemons, you must turn on the
94       daemons_enable_cluster_mode boolean. Enabled by default.
95
96       setsebool -P daemons_enable_cluster_mode 1
97
98
99
100       If you want to allow all daemons to use tcp wrappers, you must turn  on
101       the daemons_use_tcp_wrapper boolean. Disabled by default.
102
103       setsebool -P daemons_use_tcp_wrapper 1
104
105
106
107       If  you  want to allow all daemons the ability to read/write terminals,
108       you must turn on the daemons_use_tty boolean. Disabled by default.
109
110       setsebool -P daemons_use_tty 1
111
112
113
114       If you want to deny any process from ptracing or  debugging  any  other
115       processes,  you  must  turn  on  the  deny_ptrace  boolean.  Enabled by
116       default.
117
118       setsebool -P deny_ptrace 1
119
120
121
122       If you want to allow any process  to  mmap  any  file  on  system  with
123       attribute  file_type,  you must turn on the domain_can_mmap_files bool‐
124       ean. Enabled by default.
125
126       setsebool -P domain_can_mmap_files 1
127
128
129
130       If you want to allow all domains write to kmsg_device, while kernel  is
131       executed  with  systemd.log_target=kmsg parameter, you must turn on the
132       domain_can_write_kmsg boolean. Disabled by default.
133
134       setsebool -P domain_can_write_kmsg 1
135
136
137
138       If you want to allow all domains to use other domains file descriptors,
139       you must turn on the domain_fd_use boolean. Enabled by default.
140
141       setsebool -P domain_fd_use 1
142
143
144
145       If  you  want to allow all domains to have the kernel load modules, you
146       must  turn  on  the  domain_kernel_load_modules  boolean.  Disabled  by
147       default.
148
149       setsebool -P domain_kernel_load_modules 1
150
151
152
153       If you want to allow all domains to execute in fips_mode, you must turn
154       on the fips_mode boolean. Enabled by default.
155
156       setsebool -P fips_mode 1
157
158
159
160       If you want to enable reading of urandom for all domains, you must turn
161       on the global_ssp boolean. Disabled by default.
162
163       setsebool -P global_ssp 1
164
165
166
167       If  you  want  to allow confined applications to run with kerberos, you
168       must turn on the kerberos_enabled boolean. Enabled by default.
169
170       setsebool -P kerberos_enabled 1
171
172
173
174       If you want to allow system to run with  NIS,  you  must  turn  on  the
175       nis_enabled boolean. Disabled by default.
176
177       setsebool -P nis_enabled 1
178
179
180
181       If  you  want to allow confined applications to use nscd shared memory,
182       you must turn on the nscd_use_shm boolean. Disabled by default.
183
184       setsebool -P nscd_use_shm 1
185
186
187
188       If you want to enable polyinstantiated directory support, you must turn
189       on the polyinstantiation_enabled boolean. Disabled by default.
190
191       setsebool -P polyinstantiation_enabled 1
192
193
194
195       If  you want to allow a user to login as an unconfined domain, you must
196       turn on the unconfined_login boolean. Enabled by default.
197
198       setsebool -P unconfined_login 1
199
200
201
202       If you want to support ecryptfs home directories, you must turn on  the
203       use_ecryptfs_home_dirs boolean. Disabled by default.
204
205       setsebool -P use_ecryptfs_home_dirs 1
206
207
208
209       If  you  want  to support fusefs home directories, you must turn on the
210       use_fusefs_home_dirs boolean. Disabled by default.
211
212       setsebool -P use_fusefs_home_dirs 1
213
214
215
216       If you want to support NFS home  directories,  you  must  turn  on  the
217       use_nfs_home_dirs boolean. Disabled by default.
218
219       setsebool -P use_nfs_home_dirs 1
220
221
222
223       If  you  want  to  support SAMBA home directories, you must turn on the
224       use_samba_home_dirs boolean. Disabled by default.
225
226       setsebool -P use_samba_home_dirs 1
227
228
229

PORT TYPES

231       SELinux defines port types to represent TCP and UDP ports.
232
233       You can see the types associated with a port  by  using  the  following
234       command:
235
236       semanage port -l
237
238
239       Policy  governs  the  access  confined  processes  have to these ports.
240       SELinux sshd policy is very flexible allowing users to setup their sshd
241       processes in as secure a method as possible.
242
243       The following port types are defined for sshd:
244
245
246       ssh_port_t
247
248
249
250       Default Defined Ports:
251                 tcp 22
252

MANAGED FILES

254       The  SELinux process type sshd_t can manage files labeled with the fol‐
255       lowing file types.  The paths listed are the default  paths  for  these
256       file types.  Note the processes UID still need to have DAC permissions.
257
258       auth_cache_t
259
260            /var/cache/coolkey(/.*)?
261
262       auth_home_t
263
264            /root/.yubico(/.*)?
265            /root/.google_authenticator
266            /root/.google_authenticator~
267            /home/[^/]+/.yubico(/.*)?
268            /home/[^/]+/.google_authenticator
269            /home/[^/]+/.google_authenticator~
270
271       cgroup_t
272
273            /sys/fs/cgroup
274
275       cifs_t
276
277
278       cluster_conf_t
279
280            /etc/cluster(/.*)?
281
282       cluster_var_lib_t
283
284            /var/lib/pcsd(/.*)?
285            /var/lib/cluster(/.*)?
286            /var/lib/openais(/.*)?
287            /var/lib/pengine(/.*)?
288            /var/lib/corosync(/.*)?
289            /usr/lib/heartbeat(/.*)?
290            /var/lib/heartbeat(/.*)?
291            /var/lib/pacemaker(/.*)?
292
293       cluster_var_run_t
294
295            /var/run/crm(/.*)?
296            /var/run/cman_.*
297            /var/run/rsctmp(/.*)?
298            /var/run/aisexec.*
299            /var/run/heartbeat(/.*)?
300            /var/run/corosync-qnetd(/.*)?
301            /var/run/corosync-qdevice(/.*)?
302            /var/run/cpglockd.pid
303            /var/run/corosync.pid
304            /var/run/rgmanager.pid
305            /var/run/cluster/rgmanager.sk
306
307       condor_var_lib_t
308
309            /var/lib/condor(/.*)?
310            /var/lib/condor/spool(/.*)?
311            /var/lib/condor/execute(/.*)?
312
313       ecryptfs_t
314
315            /home/[^/]+/.Private(/.*)?
316            /home/[^/]+/.ecryptfs(/.*)?
317
318       faillog_t
319
320            /var/log/btmp.*
321            /var/log/faillog.*
322            /var/log/tallylog.*
323            /var/run/faillock(/.*)?
324
325       fusefs_t
326
327            /var/run/user/[^/]*/gvfs
328
329       gitosis_var_lib_t
330
331            /srv/lib/gitosis(/.*)?
332            /var/lib/gitosis(/.*)?
333            /var/lib/gitolite(3)?(/.*)?
334
335       initrc_var_run_t
336
337            /var/run/utmp
338            /var/run/random-seed
339            /var/run/runlevel.dir
340            /var/run/setmixer_flag
341
342       krb5_host_rcache_t
343
344            /var/cache/krb5rcache(/.*)?
345            /var/tmp/nfs_0
346            /var/tmp/DNS_25
347            /var/tmp/host_0
348            /var/tmp/imap_0
349            /var/tmp/HTTP_23
350            /var/tmp/HTTP_48
351            /var/tmp/ldap_55
352            /var/tmp/ldap_487
353            /var/tmp/ldapmap1_0
354
355       lastlog_t
356
357            /var/log/lastlog.*
358
359       nfs_t
360
361
362       openshift_tmp_t
363
364            /var/lib/openshift/.*/.tmp(/.*)?
365            /var/lib/openshift/.*/.sandbox(/.*)?
366            /var/lib/stickshift/.*/.tmp(/.*)?
367            /var/lib/stickshift/.*/.sandbox(/.*)?
368
369       pam_var_run_t
370
371            /var/(db|adm)/sudo(/.*)?
372            /var/run/sudo(/.*)?
373            /var/lib/sudo(/.*)?
374            /var/run/sepermit(/.*)?
375            /var/run/pam_mount(/.*)?
376
377       root_t
378
379            /sysroot/ostree/deploy/.*-atomic.*/deploy(/.*)?
380            /
381            /initrd
382
383       security_t
384
385            /selinux
386
387       ssh_home_t
388
389            /var/lib/[^/]+/.ssh(/.*)?
390            /root/.ssh(/.*)?
391            /var/lib/one/.ssh(/.*)?
392            /var/lib/pgsql/.ssh(/.*)?
393            /var/lib/openshift/[^/]+/.ssh(/.*)?
394            /var/lib/amanda/.ssh(/.*)?
395            /var/lib/stickshift/[^/]+/.ssh(/.*)?
396            /var/lib/gitolite/.ssh(/.*)?
397            /var/lib/nocpulse/.ssh(/.*)?
398            /var/lib/gitolite3/.ssh(/.*)?
399            /var/lib/openshift/gear/[^/]+/.ssh(/.*)?
400            /root/.shosts
401            /home/[^/]+/.ssh(/.*)?
402            /home/[^/]+/.ansible/cp/.*
403            /home/[^/]+/.shosts
404
405       sshd_var_run_t
406
407            /var/run/sshd.pid
408            /var/run/sshd.init.pid
409
410       systemd_passwd_var_run_t
411
412            /var/run/systemd/ask-password(/.*)?
413            /var/run/systemd/ask-password-block(/.*)?
414
415       user_tmp_t
416
417            /dev/shm/mono.*
418            /var/run/user(/.*)?
419            /tmp/.X11-unix(/.*)?
420            /tmp/.ICE-unix(/.*)?
421            /dev/shm/pulse-shm.*
422            /tmp/.X0-lock
423            /tmp/hsperfdata_root
424            /var/tmp/hsperfdata_root
425            /home/[^/]+/tmp
426            /home/[^/]+/.tmp
427            /tmp/gconfd-[^/]+
428
429       user_tmp_type
430
431            all user tmp files
432
433       var_auth_t
434
435            /var/ace(/.*)?
436            /var/rsa(/.*)?
437            /var/lib/abl(/.*)?
438            /var/lib/rsa(/.*)?
439            /var/lib/pam_ssh(/.*)?
440            /var/run/pam_ssh(/.*)?
441            /var/lib/pam_shield(/.*)?
442            /var/opt/quest/vas/vasd(/.*)?
443            /var/lib/google-authenticator(/.*)?
444
445       wtmp_t
446
447            /var/log/wtmp.*
448
449

FILE CONTEXTS

451       SELinux requires files to have an extended attribute to define the file
452       type.
453
454       You can see the context of a file using the -Z option to ls
455
456       Policy governs the access  confined  processes  have  to  these  files.
457       SELinux sshd policy is very flexible allowing users to setup their sshd
458       processes in as secure a method as possible.
459
460       STANDARD FILE CONTEXT
461
462       SELinux defines the file context types for the sshd, if you  wanted  to
463       store  files  with  these types in a diffent paths, you need to execute
464       the semanage command  to  sepecify  alternate  labeling  and  then  use
465       restorecon to put the labels on disk.
466
467       semanage fcontext -a -t sshd_var_run_t '/srv/mysshd_content(/.*)?'
468       restorecon -R -v /srv/mysshd_content
469
470       Note:  SELinux  often  uses  regular expressions to specify labels that
471       match multiple files.
472
473       The following file types are defined for sshd:
474
475
476
477       sshd_exec_t
478
479       - Set files with the sshd_exec_t type, if you  want  to  transition  an
480       executable to the sshd_t domain.
481
482
483       Paths:
484            /usr/sbin/sshd, /usr/sbin/gsisshd
485
486
487       sshd_initrc_exec_t
488
489       - Set files with the sshd_initrc_exec_t type, if you want to transition
490       an executable to the sshd_initrc_t domain.
491
492
493
494       sshd_key_t
495
496       - Set files with the sshd_key_t type, if you want to treat the files as
497       sshd key data.
498
499
500       Paths:
501            /etc/ssh/ssh_host.*_key,              /etc/ssh/ssh_host.*_key.pub,
502            /etc/ssh/primes
503
504
505       sshd_keygen_exec_t
506
507       - Set files with the sshd_keygen_exec_t type, if you want to transition
508       an executable to the sshd_keygen_t domain.
509
510
511
512       sshd_keygen_unit_file_t
513
514       - Set files with the sshd_keygen_unit_file_t type, if you want to treat
515       the files as sshd keygen unit content.
516
517
518
519       sshd_keytab_t
520
521       - Set files with the sshd_keytab_t type, if you want to treat the files
522       as kerberos keytab files.
523
524
525
526       sshd_tmpfs_t
527
528       - Set files with the sshd_tmpfs_t type, if you want to store sshd files
529       on a tmpfs file system.
530
531
532
533       sshd_unit_file_t
534
535       - Set files with the sshd_unit_file_t type, if you want  to  treat  the
536       files as sshd unit content.
537
538
539
540       sshd_var_run_t
541
542       - Set files with the sshd_var_run_t type, if you want to store the sshd
543       files under the /run or /var/run directory.
544
545
546       Paths:
547            /var/run/sshd.pid, /var/run/sshd.init.pid
548
549
550       Note: File context can be temporarily modified with the chcon  command.
551       If  you want to permanently change the file context you need to use the
552       semanage fcontext command.  This will modify the SELinux labeling data‐
553       base.  You will need to use restorecon to apply the labels.
554
555

COMMANDS

557       semanage  fcontext  can also be used to manipulate default file context
558       mappings.
559
560       semanage permissive can also be used to manipulate  whether  or  not  a
561       process type is permissive.
562
563       semanage  module can also be used to enable/disable/install/remove pol‐
564       icy modules.
565
566       semanage port can also be used to manipulate the port definitions
567
568       semanage boolean can also be used to manipulate the booleans
569
570
571       system-config-selinux is a GUI tool available to customize SELinux pol‐
572       icy settings.
573
574

AUTHOR

576       This manual page was auto-generated using sepolicy manpage .
577
578