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.
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16       For example:
17
18       ps -eZ | grep sshd_t
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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
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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:
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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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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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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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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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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.
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73       setsebool -P fips_mode 1
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77       If  you  want  to allow confined applications to run with kerberos, you
78       must turn on the kerberos_enabled boolean. Disabled by default.
79
80       setsebool -P kerberos_enabled 1
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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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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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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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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
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132            /root/.yubico(/.*)?
133            /root/.google_authenticator
134            /root/.google_authenticator~
135            /home/[^/]+/.yubico(/.*)?
136            /home/[^/]+/.google_authenticator
137            /home/[^/]+/.google_authenticator~
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139       cgroup_t
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141            /sys/fs/cgroup
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143       cifs_t
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145
146       cluster_conf_t
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148            /etc/cluster(/.*)?
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150       cluster_var_lib_t
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152            /var/lib/pcsd(/.*)?
153            /var/lib/cluster(/.*)?
154            /var/lib/openais(/.*)?
155            /var/lib/pengine(/.*)?
156            /var/lib/corosync(/.*)?
157            /usr/lib/heartbeat(/.*)?
158            /var/lib/heartbeat(/.*)?
159            /var/lib/pacemaker(/.*)?
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161       cluster_var_run_t
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163            /var/run/crm(/.*)?
164            /var/run/cman_.*
165            /var/run/rsctmp(/.*)?
166            /var/run/aisexec.*
167            /var/run/heartbeat(/.*)?
168            /var/run/corosync-qnetd(/.*)?
169            /var/run/corosync-qdevice(/.*)?
170            /var/run/corosync.pid
171            /var/run/cpglockd.pid
172            /var/run/rgmanager.pid
173            /var/run/cluster/rgmanager.sk
174
175       condor_var_lib_t
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177            /var/lib/condor(/.*)?
178            /var/lib/condor/spool(/.*)?
179            /var/lib/condor/execute(/.*)?
180
181       ecryptfs_t
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183            /home/[^/]+/.Private(/.*)?
184            /home/[^/]+/.ecryptfs(/.*)?
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186       faillog_t
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188            /var/log/btmp.*
189            /var/log/faillog.*
190            /var/log/tallylog.*
191            /var/run/faillock(/.*)?
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193       fusefs_t
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195            /var/run/user/[^/]*/gvfs
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197       gitosis_var_lib_t
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199            /srv/lib/gitosis(/.*)?
200            /var/lib/gitosis(/.*)?
201            /var/lib/gitolite(3)?(/.*)?
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203       initrc_var_run_t
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205            /var/run/utmp
206            /var/run/random-seed
207            /var/run/runlevel.dir
208            /var/run/setmixer_flag
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210       kdbusfs_t
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212
213       lastlog_t
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215            /var/log/lastlog.*
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217       nfs_t
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219
220       pam_var_run_t
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222            /var/(db|adm)/sudo(/.*)?
223            /var/lib/sudo(/.*)?
224            /var/run/sudo(/.*)?
225            /var/run/motd.d(/.*)?
226            /var/run/pam_ssh(/.*)?
227            /var/run/sepermit(/.*)?
228            /var/run/pam_mount(/.*)?
229            /var/run/pam_timestamp(/.*)?
230            /var/run/motd
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232       root_t
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234            /sysroot/ostree/deploy/.*-atomic/deploy(/.*)?
235            /
236            /initrd
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238       security_t
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240            /selinux
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242       sshd_var_run_t
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244            /var/run/sshd.pid
245            /var/run/sshd.init.pid
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247       systemd_passwd_var_run_t
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249            /var/run/systemd/ask-password(/.*)?
250            /var/run/systemd/ask-password-block(/.*)?
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252       var_auth_t
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254            /var/ace(/.*)?
255            /var/rsa(/.*)?
256            /var/lib/abl(/.*)?
257            /var/lib/rsa(/.*)?
258            /var/lib/pam_ssh(/.*)?
259            /var/lib/pam_shield(/.*)?
260            /var/opt/quest/vas/vasd(/.*)?
261            /var/lib/google-authenticator(/.*)?
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263       wtmp_t
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265            /var/log/wtmp.*
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FILE CONTEXTS

269       SELinux requires files to have an extended attribute to define the file
270       type.
271
272       You can see the context of a file using the -Z option to ls
273
274       Policy governs the access  confined  processes  have  to  these  files.
275       SELinux sshd policy is very flexible allowing users to setup their sshd
276       processes in as secure a method as possible.
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278       STANDARD FILE CONTEXT
279
280       SELinux defines the file context types for the sshd, if you  wanted  to
281       store  files  with  these types in a diffent paths, you need to execute
282       the semanage command  to  sepecify  alternate  labeling  and  then  use
283       restorecon to put the labels on disk.
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285       semanage fcontext -a -t sshd_keytab_t '/srv/mysshd_content(/.*)?'
286       restorecon -R -v /srv/mysshd_content
287
288       Note:  SELinux  often  uses  regular expressions to specify labels that
289       match multiple files.
290
291       The following file types are defined for sshd:
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295       sshd_exec_t
296
297       - Set files with the sshd_exec_t type, if you  want  to  transition  an
298       executable to the sshd_t domain.
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300
301       Paths:
302            /usr/sbin/sshd, /usr/sbin/gsisshd
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304
305       sshd_initrc_exec_t
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307       - Set files with the sshd_initrc_exec_t type, if you want to transition
308       an executable to the sshd_initrc_t domain.
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312       sshd_key_t
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314       - Set files with the sshd_key_t type, if you want to treat the files as
315       sshd key data.
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317
318       Paths:
319            /etc/ssh/ssh_host.*_key,              /etc/ssh/ssh_host.*_key.pub,
320            /etc/ssh/primes
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323       sshd_keygen_exec_t
324
325       - Set files with the sshd_keygen_exec_t type, if you want to transition
326       an executable to the sshd_keygen_t domain.
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328
329       Paths:
330            /usr/sbin/sshd-keygen, /usr/libexec/openssh/sshd-keygen
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332
333       sshd_keygen_unit_file_t
334
335       - Set files with the sshd_keygen_unit_file_t type, if you want to treat
336       the files as sshd keygen unit content.
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339
340       sshd_keytab_t
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342       - Set files with the sshd_keytab_t type, if you want to treat the files
343       as kerberos keytab files.
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347       sshd_tmpfs_t
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349       - Set files with the sshd_tmpfs_t type, if you want to store sshd files
350       on a tmpfs file system.
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354       sshd_unit_file_t
355
356       - Set files with the sshd_unit_file_t type, if you want  to  treat  the
357       files as sshd unit content.
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361       sshd_var_run_t
362
363       - Set files with the sshd_var_run_t type, if you want to store the sshd
364       files under the /run or /var/run directory.
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366
367       Paths:
368            /var/run/sshd.pid, /var/run/sshd.init.pid
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370
371       Note: File context can be temporarily modified with the chcon  command.
372       If  you want to permanently change the file context you need to use the
373       semanage fcontext command.  This will modify the SELinux labeling data‐
374       base.  You will need to use restorecon to apply the labels.
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COMMANDS

378       semanage  fcontext  can also be used to manipulate default file context
379       mappings.
380
381       semanage permissive can also be used to manipulate  whether  or  not  a
382       process type is permissive.
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384       semanage  module can also be used to enable/disable/install/remove pol‐
385       icy modules.
386
387       semanage port can also be used to manipulate the port definitions
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389       semanage boolean can also be used to manipulate the booleans
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391
392       system-config-selinux is a GUI tool available to customize SELinux pol‐
393       icy settings.
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AUTHOR

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