[meta-xilinx] OpenSSH problems : sshd will not start up because of keys with invalid format

[Giordon Stark]

Hi Adrian

Indeed, they were empty, so removing them and restarting the ssh daemon
does fix it. It does worry me a little bit that this happened... so I'll
just watch and see if it happens again. Glad I wasn't the only one that hit
this problem..

Giordon

On Mon, Mar 5, 2018 at 10:26 AM <adrian.thomasset at doulos.com> wrote:

> Hi Giordon,
>
> I've seen this before and I'm not sure what causes it - probably a reboot
> during the first sshd attempt to generate the host keys?
>
> As a result you end up with public/private keys of size 0.
> The ssh-keygen -A command will only generate a key pair for missing keys
> (zero sized keys are OK!).
>
> The solution is to delete all keys (*key*), then either restart sshd or
> run ssh-keygen -A.
>
> Regards,
> Adrian
>
>
>
> -----meta-xilinx-bounces at yoctoproject.org wrote: -----
> To: "meta-xilinx at yoctoproject.org" <meta-xilinx at yoctoproject.org>
> From: "Giordon Stark"
> Sent by: meta-xilinx-bounces at yoctoproject.org
> Date: 03/05/2018 03:39PM
> Subject: [meta-xilinx] OpenSSH problems : sshd will not start up because
> of keys with invalid format
>
>
> Hi all,
>
> I'm seeing the following:
>
> root at gfex-prototype4:~# /etc/init.d/sshd restart
> key_load_public: invalid format
> Could not load host key: /etc/ssh/ssh_host_rsa_key
> key_load_public: invalid format
> Could not load host key: /etc/ssh/ssh_host_dsa_key
> key_load_public: invalid format
> Could not load host key: /etc/ssh/ssh_host_ecdsa_key
> key_load_public: invalid format
> Could not load host key: /etc/ssh/ssh_host_ed25519_key
> sshd: no hostkeys available -- exiting.
>
> I'm not entirely sure what happened here. I'm using pyro. Is this a known
> issue? I tried regenerating using ssh-keygen and this still doesn't seem to
> work:
>
> root at gfex-prototype4:~# /usr/bin/ssh-keygen -A
> root at gfex-prototype4:~# ls -lavh /etc/ssh/
> drwxr-xr-x    2 root     root        1.0K Feb 27 17:37 .
> drwxr-xr-x   28 root     root        3.0K Jan  1  1970 ..
> -rw-r--r--    1 root     root      540.2K Feb 27 17:17 moduli
> -rw-r--r--    1 root     root        1.5K Feb 27 17:17 ssh_config
> -rw-------    1 root     root           0 Feb 27 17:37 ssh_host_dsa_key
> -rw-r--r--    1 root     root           0 Feb 27 17:37 ssh_host_dsa_key.pub
> -rw-------    1 root     root           0 Feb 27 17:37 ssh_host_ecdsa_key
> -rw-r--r--    1 root     root           0 Feb 27 17:37
> ssh_host_ecdsa_key.pub
> -rw-------    1 root     root           0 Feb 27 17:37 ssh_host_ed25519_key
> -rw-r--r--    1 root     root           0 Feb 27 17:37
> ssh_host_ed25519_key.pub
> -rw-------    1 root     root           0 Feb 27 17:37 ssh_host_rsa_key
> -rw-r--r--    1 root     root           0 Feb 27 17:37 ssh_host_rsa_key.pub
> -rw-r--r--    1 root     root        3.5K Feb 27 17:37 sshd_config
> -rw-r--r--    1 root     root        3.5K Feb 27 17:37 sshd_config_readonly
> root at gfex-prototype4:~# /etc/init.d/sshd restart
> key_load_public: invalid format
> Could not load host key: /etc/ssh/ssh_host_rsa_key
> key_load_public: invalid format
> Could not load host key: /etc/ssh/ssh_host_dsa_key
> key_load_public: invalid format
> Could not load host key: /etc/ssh/ssh_host_ecdsa_key
> key_load_public: invalid format
> Could not load host key: /etc/ssh/ssh_host_ed25519_key
> sshd: no hostkeys available -- exiting.
>
> Thanks,
>
> Giordon
> --
> Giordon Stark
> --
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>
-- 
Giordon Stark
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