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Old 03-29-2014, 01:57 AM   #1
Registered: May 2004
Distribution: Slackware
Posts: 232

Rep: Reputation: 103Reputation: 103
openssh-6.6p1 does not create ed25519 host key file


I just upgraded my Slackware 14.1 installation with the latest patches.
I updated my sshd_config file and stopped ssh via rc.sshd. Then I wanted to start it and it said:
Could not load host key: /etc/ssh/ssh_host_ed25519_key
Looking at the rc.sshd script, sshd_restart() seems to miss the creation of a ed25519 host key.

  if [ ! -f /etc/ssh/ssh_host_ed25519_key ]; then
    /usr/bin/ssh-keygen -t ed25519 -f /etc/ssh/ssh_host_ed25519_key -N ''
So I created a host key with that command and ssh is happy. Am I missing something?



PS: I noticed I had no file, even though there is one in the package. Though looking at of openssh-6.6p1, it seemed unchanged from my old one.

Last edited by lems; 03-29-2014 at 02:03 AM.
Old 03-29-2014, 05:32 AM   #2
Registered: Aug 2012
Posts: 473

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It appears the 14.1 OpenSSH 6.6 packages have a slight bug. Their rc.sshd did not get upgraded with the ed25519 key creation code.
The 14.0 updates are fine, however.

1 members found this post helpful.
Old 03-29-2014, 09:40 AM   #3
Registered: Nov 2003
Posts: 332

Rep: Reputation: Disabled
It would be much better to replace the whole block of code in rc.sshd which generates missing host keys with this single line:
ssh-keygen -A
This option was added in openssh-6.4 and automatically creates any missing keys. Using this will also deal with any future key type additions.
4 members found this post helpful.


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