Re: Authentication via none is blocking thread.

[Jakub Jelen <jjelen@xxxxxxxxxx>]

The session is blocking by default. You can set it to non-blocking
mode with ssh_set_blocking(session, 0):

https://api.libssh.org/stable/group__libssh__session.html#ga2a29cff08855611be84d050e5bec73bc

But in that  case you will have to handle the SSH_AGAIN return codes,
retry and handle timeouts on your own.

But given the server responds to other authentication methods, but not
this one, I assume this will be something wrong with the server.

In any case, debug logs would help to troubleshoot this issue.

Jakub

On Wed, Jun 12, 2024 at 8:32 AM Bhautik Radadiya
<radadiyabhautik55@xxxxxxxxx> wrote:
>
> Hi ,
> `ssh_userauth_none()` will not work when session in bloc king?
> If that is the case then how we can make session non-blocking?
>
> Regards
> Bhautik
>
> On Mon, Jun 10, 2024, 3:51 PM Bhautik Radadiya <radadiyabhautik55@xxxxxxxxx> wrote:
>>
>> Hi,
>> We are trying to logged in ciena3926m device via passwd but failed then tried via ssh_userauth_publickey that also fail so, last tried via none and we didn't get handle back to thread.
>> This we have seen intermittently but we are trying to understand why it's blocking sometimes.
>>
>> 1. How to set session as non-block??
>>
>> Regards
>> Bhautik
>>
>> On Mon, Jun 10, 2024, 3:40 PM Jakub Jelen <jjelen@xxxxxxxxxx> wrote:
>>>
>>> Hi,
>>> The `ssh_userauth_none()` should work when the session is set to
>>> non-blocking. On the first sight I do not see any significant
>>> difference from other authentication functions. Do you have a
>>> backtrace, where the code is blocking? Do you have a minimal
>>> reproducer? What is the server?
>>>
>>> Jakub
>>>
>>> On Mon, Jun 10, 2024 at 8:42 AM Bhautik Radadiya
>>> <radadiyabhautik55@xxxxxxxxx> wrote:
>>> >
>>> > Hi All,
>>> > Hope you all are well and doing well.
>>> > I am facing authentication issue sometimes when we are trying to authenticate via ssh_userauth_none
>>> > and it blocks the thread and we never gets the handle back to thread.
>>> >
>>> > 1. What could be the problem?
>>> > 2. Is ssh_userauth_none is blocking API??
>>> > 3. Is there any alternate API to authenticate via none??
>>> >
>>> > Please let me know if i am missing something or any information you need from me.
>>> > Thanks in advance for your help.
>>> >
>>> > Regards
>>> > Bhautik
>>> >
>>>
>>>