Re: [X2Go-User] How to Pass SSH Options From X2goclient?

2024-04-29 Thread Peter Keller 


On 29/04/2024 01:38, Jon Forrest wrote:

On 4/28/2024 2:54 AM, Ulrich Sibiller wrote:


Not directly, but libssh (partly) read your ssh config. So you can
add a host stanza with the settings for your  destination host
there.


Are you quite sure? 


It definitely reads it, I have something like:

Host xyz
    HostName example.com
    ... other options ...

and I can tell X2Go to connect to host xyz. However, as Ulrich points 
out X2Go doesn't handle the configuration in exactly the same way as 
ssh, for example "Include" directives are handled slightly differently.


I think that the best approach with your problem is probably to use 
ssh-agent and ControlPath directives. Then use your command-line ssh to 
establish the connection and X2Go can hopefully make use of that, even 
though you have such an extreme mismatch between ssh versions. You can 
try something like the following in .ssh/config:


Host example.com
    ControlPath /tmp/ssh-ctl-%l-%h-%p-%r
    ControlMaster auto
    ControlPersist 600

%C can be used in place of %l-%h-%p-%r, but the latter makes it easier 
to see which control socket belongs to a particular connection. (Do 'man 
ssh_config' for the full details on these directives.)



With the following in my ssh config file

Host example.com
    PubkeyAcceptedAlgorithms +ssh-rsa
    HostKeyAlgorithms=+ssh-rsa

I can run ssh on the command line successfully but trying to start an 
x2go

session results in

kex error : no match for method server host key algo: server 
[ssh-rsa,ssh-dss], client [rsa-sha2-512,rsa-sh
a2-256,ssh-ed25519,ecdsa-sha2-nistp521,ecdsa-sha2-nistp384,ecdsa-sha2-nistp256,sk-ssh-ed25...@openssh.com,s 


k-ecdsa-sha2-nistp...@openssh.com]

Does x2go actually use the system ssh executable (e.g. /usr/bin/ssh)?


I'm pretty sure that it doesn't


The reason I'm asking is because I did an experiment and renamed
ssh to xxx. I got the same result, shown above, when running the 
x2goclient!

This was a surprise.


 which explains what you observed here.

I hope that this helps,

Peter.



Thanks,
Jon



Jon Forrest mailto:nob...@gmail.com>> schrieb am
Sa., 27. Apr. 2024, 20:30:

Due to reasons too sad to describe, I need to X2go from a modern
Fedora 40 system to a Ubuntu 10.04 (!) system.

Running ssh from the command line fails with the message

Unable to negotiate with XX.XX.XX.XX port 22: no matching host key
type found. Their offer: ssh-rsa,ssh-dss

After some work I got this to work by adding

-oHostKeyAlgorithms=+ssh-rsa -oPubkeyAcceptedAlgorithms=+ssh-rsa

to the ssh command line.

My question is how can I add these options to the ssh command that
X2go executes on the client?

Cordially, Jon Forrest 
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Re: [X2Go-User] How to Pass SSH Options From X2goclient?

2024-04-28 Thread Ulrich Sibiller 
Well, that's why I wrote 'partly'. I simply don't know what keys libssh can
understand. Does it work if you leave out the host line and make these
options general ones?

Make sure you have the newest available x2goclient, maybe try to recompile
with a newer libssh.

Uli


Jon Forrest  schrieb am Mo., 29. Apr. 2024, 02:39:

> On 4/28/2024 2:54 AM, Ulrich Sibiller wrote:
>
> > Not directly, but libssh (partly) read your ssh config. So you can
> > add a host stanza with the settings for your  destination host
> > there.
>
> Are you quite sure? With the following in my ssh config file
>
> Host example.com
>  PubkeyAcceptedAlgorithms +ssh-rsa
>  HostKeyAlgorithms=+ssh-rsa
>
> I can run ssh on the command line successfully but trying to start an x2go
> session results in
>
> kex error : no match for method server host key algo: server
> [ssh-rsa,ssh-dss], client [rsa-sha2-512,rsa-sh
>
> a2-256,ssh-ed25519,ecdsa-sha2-nistp521,ecdsa-sha2-nistp384,ecdsa-sha2-nistp256,
> sk-ssh-ed25...@openssh.com,s
> k-ecdsa-sha2-nistp...@openssh.com]
>
> Does x2go actually use the system ssh executable (e.g. /usr/bin/ssh)?
> The reason I'm asking is because I did an experiment and renamed
> ssh to xxx. I got the same result, shown above, when running the
> x2goclient!
> This was a surprise.
>
> Thanks,
> Jon
>
>
> > Jon Forrest mailto:nob...@gmail.com>> schrieb am
> > Sa., 27. Apr. 2024, 20:30:
> >
> > Due to reasons too sad to describe, I need to X2go from a modern
> > Fedora 40 system to a Ubuntu 10.04 (!) system.
> >
> > Running ssh from the command line fails with the message
> >
> > Unable to negotiate with XX.XX.XX.XX port 22: no matching host key
> > type found. Their offer: ssh-rsa,ssh-dss
> >
> > After some work I got this to work by adding
> >
> > -oHostKeyAlgorithms=+ssh-rsa -oPubkeyAcceptedAlgorithms=+ssh-rsa
> >
> > to the ssh command line.
> >
> > My question is how can I add these options to the ssh command that
> > X2go executes on the client?
> >
> > Cordially, Jon Forrest
> > ___ x2go-user mailing
> > list x2go-user@lists.x2go.org 
> > https://lists.x2go.org/listinfo/x2go-user
> > 
> >
>
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Re: [X2Go-User] How to Pass SSH Options From X2goclient?

2024-04-28 Thread Jon Forrest 

On 4/28/2024 2:54 AM, Ulrich Sibiller wrote:


Not directly, but libssh (partly) read your ssh config. So you can
add a host stanza with the settings for your  destination host
there.


Are you quite sure? With the following in my ssh config file

Host example.com
PubkeyAcceptedAlgorithms +ssh-rsa
HostKeyAlgorithms=+ssh-rsa

I can run ssh on the command line successfully but trying to start an x2go
session results in

kex error : no match for method server host key algo: server [ssh-rsa,ssh-dss], 
client [rsa-sha2-512,rsa-sh
a2-256,ssh-ed25519,ecdsa-sha2-nistp521,ecdsa-sha2-nistp384,ecdsa-sha2-nistp256,sk-ssh-ed25...@openssh.com,s
k-ecdsa-sha2-nistp...@openssh.com]

Does x2go actually use the system ssh executable (e.g. /usr/bin/ssh)?
The reason I'm asking is because I did an experiment and renamed
ssh to xxx. I got the same result, shown above, when running the x2goclient!
This was a surprise.

Thanks,
Jon



Jon Forrest mailto:nob...@gmail.com>> schrieb am
Sa., 27. Apr. 2024, 20:30:

Due to reasons too sad to describe, I need to X2go from a modern
Fedora 40 system to a Ubuntu 10.04 (!) system.

Running ssh from the command line fails with the message

Unable to negotiate with XX.XX.XX.XX port 22: no matching host key
type found. Their offer: ssh-rsa,ssh-dss

After some work I got this to work by adding

-oHostKeyAlgorithms=+ssh-rsa -oPubkeyAcceptedAlgorithms=+ssh-rsa

to the ssh command line.

My question is how can I add these options to the ssh command that
X2go executes on the client?

Cordially, Jon Forrest 
___ x2go-user mailing
list x2go-user@lists.x2go.org  
https://lists.x2go.org/listinfo/x2go-user




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Re: [X2Go-User] How to Pass SSH Options From X2goclient?

2024-04-28 Thread Ulrich Sibiller 
Not directly, but libssh (partly) read your ssh config. So you can add a
host stanza with the settings for your  destination host there.

Uli

Jon Forrest  schrieb am Sa., 27. Apr. 2024, 20:30:

> Due to reasons too sad to describe, I need to X2go from a
> modern Fedora 40 system to a Ubuntu 10.04 (!) system.
>
> Running ssh from the command line fails with the message
>
> Unable to negotiate with XX.XX.XX.XX port 22: no matching host key type
> found. Their offer: ssh-rsa,ssh-dss
>
> After some work I got this to work by adding
>
> -oHostKeyAlgorithms=+ssh-rsa -oPubkeyAcceptedAlgorithms=+ssh-rsa
>
> to the ssh command line.
>
> My question is how can I add these options to the ssh command
> that X2go executes on the client?
>
> Cordially,
> Jon Forrest
> ___
> x2go-user mailing list
> x2go-user@lists.x2go.org
> https://lists.x2go.org/listinfo/x2go-user
>
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