Re: ssh forward agent

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Hi.

On Mon, 02 Jun 2025 22:45:48 +0700 Frederic Muller wrote:
> On 02/06/2025 21:45, Francis.Montagnac@xxxxxxxx wrote:
>> AFAIK sudo cannot be configured to authenticate with SSH keys.

> of course it can.

Effectively, a search shows that this is possible by configuring sudo
with pam_ssh_agent_auth (on the server, the target machine).

> It worked fine until... I switched to F42. SSH forward to ssh key to
> the target machine and my user uses that key on the target machine
> to authenticate and login into sudo.

> The target machine hasn't changed at all. My laptop however has.

F42 removed pam_ssh_agent_auth:
  https://fedoraproject.org/wiki/Changes/Remove_pam-ssh-agent_component
but that should not be the reason.

I would suspect a change in ssh-agent, but looking quickly at the
changelog of openssh (F41: 9.8 F42: 9.9) do not show anything related.

> Well.. I'll do another way for now and will continue trying to fix this 
> and set it up like it was working before,

Putting pam_ssh_agent_auth in debug mode on the target machine may
help, with:

/etc/pam.d/sudo:
   auth sufficient pam_ssh_agent_auth.so debug ...

-- 
francis
-- 
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