Re: [X2Go-User] ssh-keygen.exe loads the processor every time the client starts

[Ulrich Sibiller]

On Fri, Oct 6, 2017 at 3:12 AM, Mihai Moldovan  wrote:
>
> On 09/28/2017 01:49 PM, Max A. wrote:
> > I'm using a x2go server on CentOS 6.9 (the latest version from EPEL,
> > 4.0.1.20), clients use Windows XP/7 and the latest version of X2Go
> > Client (4.1.0.0-2017.03.11). Each time the client connects,
> > ssh-keygen.exe (C:\Program Files\x2goclient\ssh-keygen.exe) starts with
> > the parameters "-t rsa -b 4096 -N" "-C" X2Go Client RSA user key "-f C:

> I explicitly decided against that. For more information and the rationale for
> this change, refer to the release announcement:
> http://lists.x2go.org/pipermail/x2go-announcements/2017/000302.html

The release announcement talks about 2048-bit keys being generated
while this indicates that even stronger keys are being used (which in
turn increases the time to create them). I think for slow clients this
is too much. At least the admin should be able to decide about the
required security, not the maintainer.

So what about staying as is by default but providing a possibility to
pre-generate keys for those connections.

Uli
___
x2go-user mailing list
x2go-user@lists.x2go.org
https://lists.x2go.org/listinfo/x2go-user

Re: [X2Go-User] ssh-keygen.exe loads the processor every time the client starts

[Robert Dinse]

 I agree with this.  One of the things Snoden revealed was that the NSA
hung on to a large number of compromised keys to tain access to encrypted data.
In light of that re-using the same key is just making things too easy.

-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-
 Eskimo North Linux Friendly Internet Access, Shell Accounts, and Hosting.
   Knowledgeable human assistance, not telephone trees or script readers.
 See our web site: http://www.eskimo.com/ (206) 812-0051 or (800) 246-6874.

On Fri, 6 Oct 2017, Mihai Moldovan wrote:


Date: Fri, 6 Oct 2017 03:12:57 +0200
From: Mihai Moldovan 
To: Max A. , x2go-user@lists.x2go.org
Subject: Re: [X2Go-User] ssh-keygen.exe loads the processor every time the
client starts

On 09/28/2017 01:49 PM, Max A. wrote:

I'm using a x2go server on CentOS 6.9 (the latest version from EPEL,
4.0.1.20), clients use Windows XP/7 and the latest version of X2Go
Client (4.1.0.0-2017.03.11). Each time the client connects,
ssh-keygen.exe (C:\Program Files\x2goclient\ssh-keygen.exe) starts with
the parameters "-t rsa -b 4096 -N" "-C" X2Go Client RSA user key "-f C:
/Users/max/.x2go/ssh/gen/key.fl1416 ". On not very powerful computers,
this causes a delay of a few seconds with each connection and irritates
users. Tell me please, if it is possible to generate this key once and
for all?


I understand that this may be inconvenient, but no, there's currently no way to
generate a set of keys that will be re-used.

I explicitly decided against that. For more information and the rationale for
this change, refer to the release announcement:
http://lists.x2go.org/pipermail/x2go-announcements/2017/000302.html



Mihai



___
x2go-user mailing list
x2go-user@lists.x2go.org
https://lists.x2go.org/listinfo/x2go-user

Re: [X2Go-User] ssh-keygen.exe loads the processor every time the client starts

[Mihai Moldovan]

On 09/28/2017 01:49 PM, Max A. wrote:
> I'm using a x2go server on CentOS 6.9 (the latest version from EPEL, 
> 4.0.1.20), clients use Windows XP/7 and the latest version of X2Go 
> Client (4.1.0.0-2017.03.11). Each time the client connects, 
> ssh-keygen.exe (C:\Program Files\x2goclient\ssh-keygen.exe) starts with 
> the parameters "-t rsa -b 4096 -N" "-C" X2Go Client RSA user key "-f C: 
> /Users/max/.x2go/ssh/gen/key.fl1416 ". On not very powerful computers, 
> this causes a delay of a few seconds with each connection and irritates 
> users. Tell me please, if it is possible to generate this key once and 
> for all?

I understand that this may be inconvenient, but no, there's currently no way to
generate a set of keys that will be re-used.

I explicitly decided against that. For more information and the rationale for
this change, refer to the release announcement:
http://lists.x2go.org/pipermail/x2go-announcements/2017/000302.html



Mihai



signature.asc
Description: OpenPGP digital signature
___
x2go-user mailing list
x2go-user@lists.x2go.org
https://lists.x2go.org/listinfo/x2go-user

Re: [X2Go-User] ttyname failed error

[Joshua Alexander]

Thanks... got some help in the IRC channel. Changed a line on the remote
server in /etc/bashrc from mesg y to tty -s && mesg y and after doing that
when trying to connect the x2go client gave a more helpful message, namely
that it required XQuartz to be installed. After installing that I was able
to get things working.

-J


On Thu, Oct 5, 2017 at 8:10 AM, Stefan Baur  wrote:

> Am 05.10.2017 um 16:34 schrieb Joshua Alexander:
>
> > I'm trying to get x2go set up on CentOS 6. When I try to connect the
> > client says "Connection failed. megs: ttyname failed. Invalid argument
> > megs: ttyname failed: Invalid argument"... any ideas how to troubleshoot?
>
> I'd check to make sure that your default shell is bash, and that you
> don't have any commands in bashrc, profile, ... that require a TTY to be
> present.
>
> "mesg n" (note: it's "mesg", not "megs") seems like a likely candidate.
>
> Please review the thread
>  -
> this one should give you an idea which files you need to check.
>
> See e.g. these threads in the list archives, where people had similar
> issues:
> 
> 
> as well as the corresponding bug report
> 
>
> Kind Regards,
> Stefan Baur
>
> --
> BAUR-ITCS UG (haftungsbeschränkt)
> Geschäftsführer: Stefan Baur
> Eichenäckerweg 10, 89081 Ulm | Registergericht Ulm, HRB 724364
> Fon/Fax 0731 40 34 66-36/-35 | USt-IdNr.: DE268653243
>
>
> ___
> x2go-user mailing list
> x2go-user@lists.x2go.org
> https://lists.x2go.org/listinfo/x2go-user
>
___
x2go-user mailing list
x2go-user@lists.x2go.org
https://lists.x2go.org/listinfo/x2go-user

Re: [X2Go-User] ttyname failed error

[Stefan Baur]

Am 05.10.2017 um 16:34 schrieb Joshua Alexander:

> I'm trying to get x2go set up on CentOS 6. When I try to connect the
> client says "Connection failed. megs: ttyname failed. Invalid argument
> megs: ttyname failed: Invalid argument"... any ideas how to troubleshoot?

I'd check to make sure that your default shell is bash, and that you
don't have any commands in bashrc, profile, ... that require a TTY to be
present.

"mesg n" (note: it's "mesg", not "megs") seems like a likely candidate.

Please review the thread
 -
this one should give you an idea which files you need to check.

See e.g. these threads in the list archives, where people had similar
issues:


as well as the corresponding bug report


Kind Regards,
Stefan Baur

-- 
BAUR-ITCS UG (haftungsbeschränkt)
Geschäftsführer: Stefan Baur
Eichenäckerweg 10, 89081 Ulm | Registergericht Ulm, HRB 724364
Fon/Fax 0731 40 34 66-36/-35 | USt-IdNr.: DE268653243



signature.asc
Description: OpenPGP digital signature
___
x2go-user mailing list
x2go-user@lists.x2go.org
https://lists.x2go.org/listinfo/x2go-user

[X2Go-User] ttyname failed error

[Joshua Alexander]

Hello all,

I'm trying to get x2go set up on CentOS 6. When I try to connect the client
says "Connection failed. megs: ttyname failed. Invalid argument megs:
ttyname failed: Invalid argument"... any ideas how to troubleshoot?

Thanks,

Josh
___
x2go-user mailing list
x2go-user@lists.x2go.org
https://lists.x2go.org/listinfo/x2go-user