X2Go Bug report logs - #34
Support for proxy server

Package: x2goclient; Maintainer for x2goclient is X2Go Developers <x2go-dev@lists.x2go.org>; Source for x2goclient is src:x2goclient.

Reported by: "glpk xypron" <xypron.glpk@gmx.de>

Date: Fri, 21 Sep 2012 06:18:01 UTC

Severity: wishlist

Tags: pending

Done: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>

Bug is archived. No further changes may be made.

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Subject: Bug#34: SSH_OPTIONS_FD
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Date: Tue, 25 Sep 2012 10:12:16 +0200
From: Mike Gabriel <mike.gabriel@das-netzwerkteam.de>
To: 34@bugs.x2go.org
Cc: Xypron <xypron.glpk@gmx.de>, Oleksandr Shneyder
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[Message part 1 (text/plain, inline)]
Hi Alex, hi Heinrich,

On Di 25 Sep 2012 01:17:56 CEST Oleksandr Shneyder wrote:

> Am 24.09.2012 23:22, schrieb Xypron:
>> Using libssh compiled from
>> http://git.libssh.org/projects/libssh.git/log/?h=v0-5
>> I now can successfully connect via a proxy server to a SSH server.
>> My coding is available at
>> svn co http://www.xypron.de/svn/x2go/x2goclient/branches/proxy/
>>
>> The changes in sshmasterconnection.* and connectionwidget.* are complete
>> to my understanding.
>> In onmainwindow I have only treated one of three entrypoints to
>> sshmasterconnection. E.g. LDAP is not proxy enabled yet.
>> In onmainwindow the proxy password field I introduced possibly should
>> only be shown if a proxy is used and a login provided.
>>
>> Best regards
>>
>> Heinrich
>
> Hello Heinrich,
>
> I've checked your code and it looks good for me. I'll include it in
> master branch soon. You have developed support for HTTP proxy. I'm
> working now on a little more complex case - SSH proxy with
> password/public key authentication. In the future user should be able to
> choose between HTTP and SSH proxy.

Alex, I would be very pleased if you could reuse the sshproxy options  
available in PyHoca-GUI:

usesshproxy (Bool)
sshproxyuser (String)
sshproxykeyfile (Pathname)
sshproxyhost = (String, Host:Port) (example: myhost.somedomain.tld:32032)
sshproxytunnel (String) (example:  
127.0.0.1:22234:<ip-or-host-behind-proxy>:22)

> I have a one notice. In your case HTTP protocol is used for proxy. It is
> mean, that user name and password will be transmitted unencrypted. It
> can follow to security issues. Can you think about HTTPS support? This
> should be not very difficult, as Qt already supports SSL. You can check
> code of HttpBrockerClient class in X2Go Client, which can use HTTPS
> connections.

HTTP should not be available... only HTTPS.

> And one more thing, as I understood, this code work only with recent
> version of libssh. We should think, how can we make it available for
> distributions like squeeze. Such distributions should be also supported
> by X2Go Client.

Let me know what the minimum of a version of libssh is that you need.  
I will see that our Debian and Ubuntu archives have the needed version  
available (unless the distro itself has the proper version).

Greets,
Mike

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