ssh_selinux(8)

1ssh_selinux(8)                SELinux Policy ssh                ssh_selinux(8)
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NAME

6       ssh_selinux - Security Enhanced Linux Policy for the ssh processes
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DESCRIPTION

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

ENTRYPOINTS

23       The ssh_t SELinux type can be entered via the ssh_exec_t file type.
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25       The default entrypoint paths for the ssh_t domain are the following:
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27       /usr/bin/ssh, /usr/libexec/nm-ssh-service
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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       ssh policy is very flexible allowing users to setup their ssh processes
37       in as secure a method as possible.
38
39       The following process types are defined for ssh:
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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 ssh_t can be used to make the process type
44       ssh_t permissive. SELinux does not deny access  to  permissive  process
45       types, but the AVC (SELinux denials) messages are still generated.
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47

BOOLEANS

49       SELinux  policy  is  customizable  based on least access required.  ssh
50       policy is extremely flexible and has several booleans that allow you to
51       manipulate the policy and run ssh with the tightest access possible.
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55       If  you  want  to allow host key based authentication, you must turn on
56       the ssh_keysign boolean. Disabled by default.
57
58       setsebool -P ssh_keysign 1
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61
62       If you want to allow users to resolve user passwd entries directly from
63       ldap  rather  then  using  a  sssd server, you must turn on the authlo‐
64       gin_nsswitch_use_ldap boolean. Disabled by default.
65
66       setsebool -P authlogin_nsswitch_use_ldap 1
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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. Enabled 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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90
91       If  you  want to allow confined applications to use nscd shared memory,
92       you must turn on the nscd_use_shm boolean. Enabled by default.
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94       setsebool -P nscd_use_shm 1
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98       If you want to allow regular users direct dri device access,  you  must
99       turn on the selinuxuser_direct_dri_enabled boolean. Enabled by default.
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101       setsebool -P selinuxuser_direct_dri_enabled 1
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104
105       If you want to allow users to run TCP servers (bind to ports and accept
106       connection from the same domain  and  outside  users)   disabling  this
107       forces  FTP  passive mode and may change other protocols, you must turn
108       on the selinuxuser_tcp_server boolean. Disabled by default.
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110       setsebool -P selinuxuser_tcp_server 1
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112
113
114       If you want to allows clients to write to the X  server  shared  memory
115       segments, you must turn on the xserver_clients_write_xshm boolean. Dis‐
116       abled by default.
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118       setsebool -P xserver_clients_write_xshm 1
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PORT TYPES

123       SELinux defines port types to represent TCP and UDP ports.
124
125       You can see the types associated with a port  by  using  the  following
126       command:
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128       semanage port -l
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130
131       Policy  governs  the  access  confined  processes  have to these ports.
132       SELinux ssh policy is very flexible allowing users to setup  their  ssh
133       processes in as secure a method as possible.
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135       The following port types are defined for ssh:
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137
138       ssh_port_t
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142       Default Defined Ports:
143                 tcp 22
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MANAGED FILES

146       The  SELinux  process type ssh_t can manage files labeled with the fol‐
147       lowing file types.  The paths listed are the default  paths  for  these
148       file types.  Note the processes UID still need to have DAC permissions.
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150       cifs_t
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152
153       ecryptfs_t
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155            /home/[^/]+/.Private(/.*)?
156            /home/[^/]+/.ecryptfs(/.*)?
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158       fusefs_t
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160            /var/run/user/[^/]*/gvfs
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162       nfs_t
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165       ssh_home_t
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167            /var/lib/[^/]+/.ssh(/.*)?
168            /root/.ssh(/.*)?
169            /var/lib/one/.ssh(/.*)?
170            /var/lib/pgsql/.ssh(/.*)?
171            /var/lib/openshift/[^/]+/.ssh(/.*)?
172            /var/lib/amanda/.ssh(/.*)?
173            /var/lib/stickshift/[^/]+/.ssh(/.*)?
174            /var/lib/gitolite/.ssh(/.*)?
175            /var/lib/nocpulse/.ssh(/.*)?
176            /var/lib/gitolite3/.ssh(/.*)?
177            /var/lib/openshift/gear/[^/]+/.ssh(/.*)?
178            /root/.shosts
179            /home/[^/]+/.ssh(/.*)?
180            /home/[^/]+/.ansible/cp/.*
181            /home/[^/]+/.shosts
182
183       ssh_tmpfs_t
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185
186       user_fonts_cache_t
187
188            /root/.fontconfig(/.*)?
189            /root/.fonts/auto(/.*)?
190            /root/.fonts.cache-.*
191            /home/[^/]+/.fontconfig(/.*)?
192            /home/[^/]+/.fonts/auto(/.*)?
193            /home/[^/]+/.fonts.cache-.*
194
195       user_tmp_t
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197            /dev/shm/mono.*
198            /var/run/user(/.*)?
199            /tmp/.ICE-unix(/.*)?
200            /tmp/.X11-unix(/.*)?
201            /dev/shm/pulse-shm.*
202            /tmp/.X0-lock
203            /tmp/hsperfdata_root
204            /var/tmp/hsperfdata_root
205            /home/[^/]+/tmp
206            /home/[^/]+/.tmp
207            /tmp/gconfd-[^/]+
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209       user_tmp_type
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211            all user tmp files
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213       xserver_tmpfs_t
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FILE CONTEXTS

218       SELinux requires files to have an extended attribute to define the file
219       type.
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221       You can see the context of a file using the -Z option to ls
222
223       Policy governs the access  confined  processes  have  to  these  files.
224       SELinux  ssh  policy is very flexible allowing users to setup their ssh
225       processes in as secure a method as possible.
226
227       STANDARD FILE CONTEXT
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229       SELinux defines the file context types for the ssh, if  you  wanted  to
230       store  files  with  these types in a diffent paths, you need to execute
231       the semanage command  to  sepecify  alternate  labeling  and  then  use
232       restorecon to put the labels on disk.
233
234       semanage fcontext -a -t ssh_home_t '/srv/myssh_content(/.*)?'
235       restorecon -R -v /srv/myssh_content
236
237       Note:  SELinux  often  uses  regular expressions to specify labels that
238       match multiple files.
239
240       The following file types are defined for ssh:
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244       ssh_agent_exec_t
245
246       - Set files with the ssh_agent_exec_t type, if you want  to  transition
247       an executable to the ssh_agent_t domain.
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251       ssh_agent_tmp_t
252
253       -  Set  files  with  the ssh_agent_tmp_t type, if you want to store ssh
254       agent temporary files in the /tmp directories.
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258       ssh_exec_t
259
260       - Set files with the ssh_exec_t type, if you want to transition an exe‐
261       cutable to the ssh_t domain.
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263
264       Paths:
265            /usr/bin/ssh, /usr/libexec/nm-ssh-service
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268       ssh_home_t
269
270       - Set files with the ssh_home_t type, if you want to store ssh files in
271       the users home directory.
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273
274       Paths:
275            /var/lib/[^/]+/.ssh(/.*)?,                       /root/.ssh(/.*)?,
276            /var/lib/one/.ssh(/.*)?, /var/lib/pgsql/.ssh(/.*)?, /var/lib/open‐
277            shift/[^/]+/.ssh(/.*)?,                /var/lib/amanda/.ssh(/.*)?,
278            /var/lib/stickshift/[^/]+/.ssh(/.*)?,               /var/lib/gito‐
279            lite/.ssh(/.*)?,   /var/lib/nocpulse/.ssh(/.*)?,    /var/lib/gito‐
280            lite3/.ssh(/.*)?,        /var/lib/openshift/gear/[^/]+/.ssh(/.*)?,
281            /root/.shosts, /home/[^/]+/.ssh(/.*)?, /home/[^/]+/.ansible/cp/.*,
282            /home/[^/]+/.shosts
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284
285       ssh_keygen_exec_t
286
287       -  Set files with the ssh_keygen_exec_t type, if you want to transition
288       an executable to the ssh_keygen_t domain.
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292       ssh_keygen_tmp_t
293
294       - Set files with the ssh_keygen_tmp_t type, if you want  to  store  ssh
295       keygen temporary files in the /tmp directories.
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298
299       ssh_keysign_exec_t
300
301       - Set files with the ssh_keysign_exec_t type, if you want to transition
302       an executable to the ssh_keysign_t domain.
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304
305       Paths:
306            /usr/lib/openssh/ssh-keysign, /usr/libexec/openssh/ssh-keysign
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308
309       ssh_tmpfs_t
310
311       - Set files with the ssh_tmpfs_t type, if you want to store  ssh  files
312       on a tmpfs file system.
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316       sshd_exec_t
317
318       -  Set  files  with  the sshd_exec_t type, if you want to transition an
319       executable to the sshd_t domain.
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321
322       Paths:
323            /usr/sbin/sshd, /usr/sbin/gsisshd
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325
326       sshd_initrc_exec_t
327
328       - Set files with the sshd_initrc_exec_t type, if you want to transition
329       an executable to the sshd_initrc_t domain.
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333       sshd_key_t
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335       - Set files with the sshd_key_t type, if you want to treat the files as
336       sshd key data.
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338
339       Paths:
340            /etc/ssh/ssh_host.*_key,              /etc/ssh/ssh_host.*_key.pub,
341            /etc/ssh/primes
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343
344       sshd_keygen_exec_t
345
346       - Set files with the sshd_keygen_exec_t type, if you want to transition
347       an executable to the sshd_keygen_t domain.
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349
350       Paths:
351            /usr/sbin/sshd-keygen, /usr/libexec/openssh/sshd-keygen
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353
354       sshd_keygen_unit_file_t
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356       - Set files with the sshd_keygen_unit_file_t type, if you want to treat
357       the files as sshd keygen unit content.
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361       sshd_keytab_t
362
363       - Set files with the sshd_keytab_t type, if you want to treat the files
364       as kerberos keytab files.
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368       sshd_tmpfs_t
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370       - Set files with the sshd_tmpfs_t type, if you want to store sshd files
371       on a tmpfs file system.
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375       sshd_unit_file_t
376
377       -  Set  files  with the sshd_unit_file_t type, if you want to treat the
378       files as sshd unit content.
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382       sshd_var_run_t
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384       - Set files with the sshd_var_run_t type, if you want to store the sshd
385       files under the /run or /var/run directory.
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387
388       Paths:
389            /var/run/sshd.pid, /var/run/sshd.init.pid
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391
392       Note:  File context can be temporarily modified with the chcon command.
393       If you want to permanently change the file context you need to use  the
394       semanage fcontext command.  This will modify the SELinux labeling data‐
395       base.  You will need to use restorecon to apply the labels.
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397

COMMANDS

399       semanage fcontext can also be used to manipulate default  file  context
400       mappings.
401
402       semanage  permissive  can  also  be used to manipulate whether or not a
403       process type is permissive.
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405       semanage module can also be used to enable/disable/install/remove  pol‐
406       icy modules.
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408       semanage port can also be used to manipulate the port definitions
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410       semanage boolean can also be used to manipulate the booleans
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412
413       system-config-selinux is a GUI tool available to customize SELinux pol‐
414       icy settings.
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AUTHOR

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