I generated a new host key for one of our systems using:
ssh-keygen -t rsa -b 4096 -f ssh_host_rsa_key_4096
I then ran 'ls -Z on the keys'
ll -Z *key*
-rw-------. root root system_u:object_r:sshd_key_t:s0 ssh_host_dsa_key
-rw-r--r--. root root system_u:object_r:sshd_key_t:s0
ssh_host_dsa_key.pub
-rw-------. root root system_u:object_r:sshd_key_t:s0 ssh_host_key
-rw-r--r--. root root system_u:object_r:sshd_key_t:s0 ssh_host_key.pub
-rw-------. root root system_u:object_r:sshd_key_t:s0 ssh_host_rsa_key
-rw-------. root root unconfined_u:object_r:sshd_key_t:s0
ssh_host_rsa_key_4096
-rw-r--r--. root root unconfined_u:object_r:sshd_key_t:s0
ssh_host_rsa_key_4096.pub
-rw-r--r--. root root system_u:object_r:sshd_key_t:s0
ssh_host_rsa_key.pub
As it seems odd, to me, that all the other files had a system_u user
while the new had unconfined_u. So, I decided to run restorecon -v to
presumably set the SELinux user correctly for the new keys: But that
is not what happened:
restorecon -v *
restorecon reset /etc/ssh/ssh_host_rsa_key_4096 context
unconfined_u:object_r:sshd_key_t:s0->unconfined_u:object_r:etc_t:s0
restorecon reset /etc/ssh/ssh_host_rsa_key_4096.pub context
unconfined_u:object_r:sshd_key_t:s0->unconfined_u:object_r:etc_t:s0
As you can see, not only did the user not get set to system_u but the
type was changed to etc_t.
Why were the new key files changed from sshd_key_t types to the
generic etc_t types? Why was the user not changed in either case from
unconfined_u to system_u or vice versa?
There is no REQUIREMENT that a host key have a particular file name is
there? The sshd_config provides for setting one explicitly and doing
so seems to cause no problems with ssh connections that I have yet
encountered.
--
*** E-Mail is NOT a SECURE channel ***
James B. Byrne mailto:ByrneJB@xxxxxxxxxxxxx
Harte & Lyne Limited http://www.harte-lyne.ca
9 Brockley Drive vox: +1 905 561 1241
Hamilton, Ontario fax: +1 905 561 0757
Canada L8E 3C3
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