sshd_selinux(8)

1sshd_selinux(8)               SELinux Policy sshd              sshd_selinux(8)
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NAME

6       sshd_selinux - Security Enhanced Linux Policy for the sshd processes
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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
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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:
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27       /usr/sbin/sshd, /usr/sbin/gsisshd
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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
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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
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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.
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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.
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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
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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
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68
69
70       If you want to allow all domains to execute in fips_mode, you must turn
71       on the fips_mode boolean. Enabled by default.
72
73       setsebool -P fips_mode 1
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75
76
77       If  you  want  to allow confined applications to run with kerberos, you
78       must turn on the kerberos_enabled boolean. Enabled by default.
79
80       setsebool -P kerberos_enabled 1
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82
83
84       If you want to allow system to run with  NIS,  you  must  turn  on  the
85       nis_enabled boolean. Disabled by default.
86
87       setsebool -P nis_enabled 1
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89
90
91       If you want to enable polyinstantiated directory support, you must turn
92       on the polyinstantiation_enabled boolean. Disabled by default.
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94       setsebool -P polyinstantiation_enabled 1
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96
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PORT TYPES

99       SELinux defines port types to represent TCP and UDP ports.
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101       You can see the types associated with a port  by  using  the  following
102       command:
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104       semanage port -l
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106
107       Policy  governs  the  access  confined  processes  have to these ports.
108       SELinux sshd policy is very flexible allowing users to setup their sshd
109       processes in as secure a method as possible.
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111       The following port types are defined for sshd:
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113
114       ssh_port_t
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117
118       Default Defined Ports:
119                 tcp 22
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MANAGED FILES

122       The  SELinux process type sshd_t can manage files labeled with the fol‐
123       lowing file types.  The paths listed are the default  paths  for  these
124       file types.  Note the processes UID still need to have DAC permissions.
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126       auth_cache_t
127
128            /var/cache/coolkey(/.*)?
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130       auth_home_t
131
132            /root/.yubico(/.*)?
133            /root/.config/Yubico(/.*)?
134            /root/.google_authenticator
135            /root/.google_authenticator~
136            /home/[^/]+/.yubico(/.*)?
137            /home/[^/]+/.config/Yubico(/.*)?
138            /home/[^/]+/.google_authenticator
139            /home/[^/]+/.google_authenticator~
140
141       cifs_t
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143
144       cluster_conf_t
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146            /etc/cluster(/.*)?
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148       cluster_var_lib_t
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150            /var/lib/pcsd(/.*)?
151            /var/lib/cluster(/.*)?
152            /var/lib/openais(/.*)?
153            /var/lib/pengine(/.*)?
154            /var/lib/corosync(/.*)?
155            /usr/lib/heartbeat(/.*)?
156            /var/lib/heartbeat(/.*)?
157            /var/lib/pacemaker(/.*)?
158
159       cluster_var_run_t
160
161            /var/run/crm(/.*)?
162            /var/run/cman_.*
163            /var/run/rsctmp(/.*)?
164            /var/run/aisexec.*
165            /var/run/heartbeat(/.*)?
166            /var/run/pcsd-ruby.socket
167            /var/run/corosync-qnetd(/.*)?
168            /var/run/corosync-qdevice(/.*)?
169            /var/run/corosync.pid
170            /var/run/cpglockd.pid
171            /var/run/rgmanager.pid
172            /var/run/cluster/rgmanager.sk
173
174       condor_var_lib_t
175
176            /var/lib/condor(/.*)?
177            /var/lib/condor/spool(/.*)?
178            /var/lib/condor/execute(/.*)?
179
180       ecryptfs_t
181
182            /home/[^/]+/.Private(/.*)?
183            /home/[^/]+/.ecryptfs(/.*)?
184
185       faillog_t
186
187            /var/log/btmp.*
188            /var/log/faillog.*
189            /var/log/tallylog.*
190            /var/run/faillock(/.*)?
191
192       fusefs_t
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194            /var/run/user/[^/]*/gvfs
195
196       gitosis_var_lib_t
197
198            /srv/lib/gitosis(/.*)?
199            /var/lib/gitosis(/.*)?
200            /var/lib/gitolite(3)?(/.*)?
201
202       initrc_var_run_t
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204            /var/run/utmp
205            /var/run/random-seed
206            /var/run/runlevel.dir
207            /var/run/setmixer_flag
208
209       kadmind_tmp_t
210
211            /var/tmp/kadmin_0
212            /var/tmp/kiprop_0
213
214       krb5_host_rcache_t
215
216            /var/tmp/krb5_0.rcache2
217            /var/cache/krb5rcache(/.*)?
218            /var/tmp/nfs_0
219            /var/tmp/DNS_25
220            /var/tmp/host_0
221            /var/tmp/imap_0
222            /var/tmp/HTTP_23
223            /var/tmp/HTTP_48
224            /var/tmp/ldap_55
225            /var/tmp/ldap_487
226            /var/tmp/ldapmap1_0
227
228       lastlog_t
229
230            /var/log/lastlog.*
231
232       nfs_t
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234
235       openshift_tmp_t
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237            /var/lib/openshift/.*/.tmp(/.*)?
238            /var/lib/openshift/.*/.sandbox(/.*)?
239            /var/lib/stickshift/.*/.tmp(/.*)?
240            /var/lib/stickshift/.*/.sandbox(/.*)?
241
242       pam_var_run_t
243
244            /var/(db|adm)/sudo(/.*)?
245            /var/lib/sudo(/.*)?
246            /var/run/sudo(/.*)?
247            /var/run/pam_ssh(/.*)?
248            /var/run/sepermit(/.*)?
249            /var/run/pam_mount(/.*)?
250            /var/run/pam_timestamp(/.*)?
251
252       root_t
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254            /sysroot/ostree/deploy/.*-atomic/deploy(/.*)?
255            /
256            /initrd
257
258       security_t
259
260            /selinux
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262       sshd_var_run_t
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264            /var/run/sshd.pid
265            /var/run/sshd.init.pid
266
267       systemd_passwd_var_run_t
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269            /var/run/systemd/ask-password(/.*)?
270            /var/run/systemd/ask-password-block(/.*)?
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272       user_tmp_t
273
274            /dev/shm/mono.*
275            /var/run/user(/.*)?
276            /tmp/.ICE-unix(/.*)?
277            /tmp/.X11-unix(/.*)?
278            /dev/shm/pulse-shm.*
279            /tmp/.X0-lock
280            /tmp/hsperfdata_root
281            /var/tmp/hsperfdata_root
282            /home/[^/]+/tmp
283            /home/[^/]+/.tmp
284            /tmp/gconfd-[^/]+
285
286       user_tmp_type
287
288            all user tmp files
289
290       var_auth_t
291
292            /var/ace(/.*)?
293            /var/rsa(/.*)?
294            /var/lib/abl(/.*)?
295            /var/lib/rsa(/.*)?
296            /var/lib/pam_ssh(/.*)?
297            /var/lib/pam_shield(/.*)?
298            /var/opt/quest/vas/vasd(/.*)?
299            /var/lib/google-authenticator(/.*)?
300
301       wtmp_t
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303            /var/log/wtmp.*
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305

FILE CONTEXTS

307       SELinux requires files to have an extended attribute to define the file
308       type.
309
310       You can see the context of a file using the -Z option to ls
311
312       Policy governs the access  confined  processes  have  to  these  files.
313       SELinux sshd policy is very flexible allowing users to setup their sshd
314       processes in as secure a method as possible.
315
316       STANDARD FILE CONTEXT
317
318       SELinux defines the file context types for the sshd, if you  wanted  to
319       store  files  with  these types in a diffent paths, you need to execute
320       the semanage command to sepecify alternate labeling and  then  use  re‐
321       storecon to put the labels on disk.
322
323       semanage fcontext -a -t sshd_keytab_t '/srv/mysshd_content(/.*)?'
324       restorecon -R -v /srv/mysshd_content
325
326       Note:  SELinux  often  uses  regular expressions to specify labels that
327       match multiple files.
328
329       The following file types are defined for sshd:
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331
332
333       sshd_exec_t
334
335       - Set files with the sshd_exec_t type, if you want to transition an ex‐
336       ecutable to the sshd_t domain.
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338
339       Paths:
340            /usr/sbin/sshd, /usr/sbin/gsisshd
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342
343       sshd_initrc_exec_t
344
345       - Set files with the sshd_initrc_exec_t type, if you want to transition
346       an executable to the sshd_initrc_t domain.
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349
350       sshd_key_t
351
352       - Set files with the sshd_key_t type, if you want to treat the files as
353       sshd key data.
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355
356       Paths:
357            /etc/ssh/ssh_host.*_key,              /etc/ssh/ssh_host.*_key.pub,
358            /etc/ssh/primes
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360
361       sshd_keygen_exec_t
362
363       - Set files with the sshd_keygen_exec_t type, if you want to transition
364       an executable to the sshd_keygen_t domain.
365
366
367       Paths:
368            /usr/sbin/sshd-keygen, /usr/libexec/openssh/sshd-keygen
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370
371       sshd_keygen_unit_file_t
372
373       - Set files with the sshd_keygen_unit_file_t type, if you want to treat
374       the files as sshd keygen unit content.
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376
377
378       sshd_keytab_t
379
380       - Set files with the sshd_keytab_t type, if you want to treat the files
381       as kerberos keytab files.
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383
384
385       sshd_tmpfs_t
386
387       - Set files with the sshd_tmpfs_t type, if you want to store sshd files
388       on a tmpfs file system.
389
390
391
392       sshd_unit_file_t
393
394       - Set files with the sshd_unit_file_t type, if you want  to  treat  the
395       files as sshd unit content.
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397
398
399       sshd_var_run_t
400
401       - Set files with the sshd_var_run_t type, if you want to store the sshd
402       files under the /run or /var/run directory.
403
404
405       Paths:
406            /var/run/sshd.pid, /var/run/sshd.init.pid
407
408
409       Note: File context can be temporarily modified with the chcon  command.
410       If  you want to permanently change the file context you need to use the
411       semanage fcontext command.  This will modify the SELinux labeling data‐
412       base.  You will need to use restorecon to apply the labels.
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414

COMMANDS

416       semanage  fcontext  can also be used to manipulate default file context
417       mappings.
418
419       semanage permissive can also be used to manipulate  whether  or  not  a
420       process type is permissive.
421
422       semanage  module can also be used to enable/disable/install/remove pol‐
423       icy modules.
424
425       semanage port can also be used to manipulate the port definitions
426
427       semanage boolean can also be used to manipulate the booleans
428
429
430       system-config-selinux is a GUI tool available to customize SELinux pol‐
431       icy settings.
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433

AUTHOR

435       This manual page was auto-generated using sepolicy manpage .
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