question about pubkey and passphrase

Harald Dunkel harald.dunkel at
Tue Feb 11 18:37:09 AEDT 2020

Hi folks,

On 2020-02-10 23:59, Damien Miller wrote:
> On Mon, 10 Feb 2020, Harald Dunkel wrote:
>> Hi folks,
>> Since Docker can bind-mount every .ssh directory I am looking for
>> some way to forbid unprotected private keys.
>> AFAICS it is currently not possible on the sshd to verify that
>> the peer's private key was protected by a passphrase. Can you
>> confirm?
> That's not possible - the client could simply lie about whether the
> key was password-protected and the server has no way to determine the
> truth.

Thanx very much for your detailed replies. I take this as a confirmation.

Of course I did not mean to blame openssh for this problem.


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