My cubieboard2 does not have an rtc, so at boot time the clock is at the
epoche start. Once the network is up, then NTP sets the clock.
So I tried connecting to SSH after the install and got:
Read from socket failed: Connection reset by peer
systemctl status sshd.service, said something about could not read keys,
so I checked and found:
# ls /etc/ssh/ -ls
total 252
240 -rw-r--r--. 1 root root 242153 Jul 18 19:50 moduli
4 -rw-r--r--. 1 root root 2121 Jul 18 19:50 ssh_config
8 -rw-------. 1 root root 4400 Aug 15 14:45 sshd_config
0 -rw-r-----. 1 root ssh_keys 0 Dec 31 1969 ssh_host_ecdsa_key
0 -rw-r--r--. 1 root root 0 Dec 31 1969 ssh_host_ecdsa_key.pub
0 -rw-r-----. 1 root ssh_keys 0 Dec 31 1969 ssh_host_ed25519_key
0 -rw-r--r--. 1 root root 0 Dec 31 1969
ssh_host_ed25519_key.pub
0 -rw-r-----. 1 root ssh_keys 0 Dec 31 1969 ssh_host_rsa_key
0 -rw-r--r--. 1 root root 0 Dec 31 1969 ssh_host_rsa_key.pub
I stopped sshd, deleted the key files, restarted sshd and now:
# ls /etc/ssh/ -ls
total 272
240 -rw-r--r--. 1 root root 242153 Jul 18 19:50 moduli
8 -rw-------. 1 root root 4400 Aug 15 14:45 sshd_config
4 -rw-r-----. 1 root ssh_keys 227 Aug 15 14:53 ssh_host_ecdsa_key
4 -rw-r--r--. 1 root root 162 Aug 15 14:53 ssh_host_ecdsa_key.pub
4 -rw-r-----. 1 root ssh_keys 387 Aug 15 14:53 ssh_host_ed25519_key
4 -rw-r--r--. 1 root root 82 Aug 15 14:53
ssh_host_ed25519_key.pub
4 -rw-r-----. 1 root ssh_keys 1675 Aug 15 14:53 ssh_host_rsa_key
4 -rw-r--r--. 1 root root 382 Aug 15 14:53 ssh_host_rsa_key.pub
And I can connect.
So this is a problem with ssh that it will not properly make the keys
when the system date is that old.
related, I move the sshd port, and update SELinux policy with:
semanage port -a -t ssh_port_t -p tcp 1234
and got the following messages:
[ 1828.788735] SELinux: Permission audit_read in class capability2 not
defined in policy.
[ 1828.796870] SELinux: the above unknown classes and permissions will
be allowed
[ 1829.450779] SELinux: Context
system_u:system_r:vbetool_t:s0-s0:c0.c1023 became invalid (unmapped).
[ 1831.528160] SELinux: Context
system_u:unconfined_r:sandbox_t:s0-s0:c0.c1023 became invalid (unmapped).
[ 1832.890157] SELinux: Context
unconfined_u:system_r:vbetool_t:s0-s0:c0.c1023 became invalid (unmapped).
[ 1834.966398] SELinux: Context
unconfined_u:unconfined_r:sandbox_t:s0-s0:c0.c1023 became invalid
(unmapped).
But it seems to have worked. That is SSH can be reached at the changed
port. And yes, I also did the firewall-cmd for the new port number.
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