Fedora-Xfce-armhfp-21-20140815-sda.raw.xz problems with sshd

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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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