x2go-dev

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Public key authentication on Mac OS X
by Mihai Moldovan 28 May '10

28 May '10

Hi all, whilst using x2goclient on Mac OS X Snow Leopard, I came across a few problems. Initially, I thought I could just set up x2goclient to connect to my server which supports public key authentication. Actually, pubkey is my default authentication scheme when connecting to this very server and ssh always chooses it. Furthermore, the password for this very private key is saved in Mac OS X' keychain, providing a ssh-agent like (well, let's say identical) environment. First off, I guess you're only using the stock SSH client found on the machine yourself, so why don't you let it handle it the authentication and (optionally) query for a password, if this situation comes up? Secondly, if you dislike this, keychain integration is still very favorable on Mac OS X, as it saves the user the burden to provide a password for his private key. While this is not exactly very secure, it's very comfortable on the other hand. (Note: keychain can save the provided password and "enter" it automatically everytime the privkey is requested, but it's not necessary to do so. This said, users can of course choose whether the password is to be remembered or not.) I've seen that there is a way to select a private key for authentication in x2goclient. That's handy and I like it, really. As said before, ssh (and ssh-agent/keychain) could handle this as well, but it's nice to have such an option, i.e. when using a very specific key for this purpose only. Any disagreeing or agreeing thoughts on this? Best regards, Mihai

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Opening a session to user with encrypted home directory
by Milan Knížek 28 May '10

28 May '10

Hello, there appears to be a problem with connecting to x2goserver-home (Ubuntu 9.10), when the user has encrypted home directory (using ecryptfs). The cause seems to be that some files need to be open in the home directory before the ecryptfs is mounted. Trying to connect again usually works. Also, the unsuccessful first session remains hanging as "running" in the server's database. I checked that after the first unsuccessful trial, the ecryptfs home directory was not mounted. Could it be caused by not enough time for ecryptfs mounting scripts to mount home directory before x2go wants to write to it? Log of the first session: /usr/bin/x2goagent: řádek 1: -e: command not found NXAGENT - Version 3.4.0 Copyright (C) 2001, 2007 NoMachine. See http://www.nomachine.com/ for more information. Info: Agent running with pid '16895'. Session: Starting session at 'Tue Jan 26 22:02:19 2010'. Loop: PANIC! Can't open options file '/home/modeluser/.x2go/C-modeluser-90-1264539738_stDGNOME_dp32/options'. Error is 2 'No such file or directory'. Error: Can't open options file '/home/modeluser/.x2go/C-modeluser-90-1264539738_stDGNOME_dp32/options'. Error is 2 'No such file or directory'. Error: Parsing of NX transport options failed. _X11TransSocketConnectConnInfo: Cannot create the NX transport. Loop: WARNING! Signal 'SIGINT not installed in process with pid '16895'. Warning: Signal 'SIGINT not installed in process with pid '16895'. Loop: WARNING! Signal 'SIGTERM not installed in process with pid '16895'. Warning: Signal 'SIGTERM not installed in process with pid '16895'. Loop: WARNING! Signal 'SIGHUP not installed in process with pid '16895'. Warning: Signal 'SIGHUP not installed in process with pid '16895'. Loop: WARNING! Signal 'SIGCHLD not installed in process with pid '16895'. Warning: Signal 'SIGCHLD not installed in process with pid '16895'. Error: Aborting session with 'X2goagent: Unable to open display 'nx/nx,options=/home/modeluser/.x2go/C-modeluser-90-1264539738_stDGNOME_dp32/options:90''. Session: Aborting session at 'Tue Jan 26 22:02:19 2010'. Session: Session aborted at 'Tue Jan 26 22:02:19 2010'. Loop: WARNING! Signals were not blocked in process with pid '16895'. Warning: Signals were not blocked in process with pid '16895'. NXPROXY - Version 3.4.0 Copyright (C) 2001, 2007 NoMachine. See http://www.nomachine.com/ for more information. Info: Proxy running in server mode with pid '16895'. Session: Starting session at 'Tue Jan 26 22:02:19 2010'. Loop: PANIC! Call to bind failed for UNIX domain socket (null)/.X11-unix/X90. Error is 2 'No such file or directory'. Error: Call to bind failed for UNIX domain socket (null)/.X11-unix/X90. Error is 2 'No such file or directory'. Session: Session terminated at 'Tue Jan 26 22:02:19 2010'. Milan Knizek knizek (dot) confy (at) volny (dot) cz http://www.milan-knizek.net - About linux and photography (Czech language only)

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Firefox Plugin (was Desktop Sharing
by Jo-Erlend Schinstad 24 May '10

24 May '10

I thought this was important enough to open a new thread. On 16 May 2010 16:27, Heinz-M. Graesing <x2go-dev(a)x2go.org> wrote: > Hello Jo-Erlend, > > Am 15.05.2010 14:45, schrieb Jo-Erlend Schinstad: > >> Could you elaborate a bit on the Firefox plugin? Will it be something >> like Nomachines NX Web Companion that enables you to download and >> install a userspace NX client and use it directly from the web? Will >> this plugin work on all platforms? >> > > The x2goplugin is an firefox plugin and uses the xpi (firefox addon) > installation routine. It makes it possible to embedd x2go session into > websites itself or to show them outside the browser in an own window. > Sessions can be resized - even inside the website - for example inside a > resizeable <div></div> And you actually do mean the NX session, not just the login/installer dialog like NX Web Companion? Wow. :) > It is executed in userspace. All components will be inside the > extensions directory. It will be listed as add on and can easily be removed. > It'll be available for windows 32 and linux 64 and 32 bit. I don't know > at the moment if the macOS version will be possible - maybe as a reduced > version (no pulseaudio, no website embedding,...) It would be nice to have Mac OS too, but it's not very important to me. But you're saying PulseAudio would work nicely in Windows as well, so you can use two-way audio for VoIP, etc? > The configuration can be delivered via the webserver (as an *.x2go file) > and every feature of x2go is supported (bidirectional audio, sshfs, > x2goprint,...). Then I could make it so that the user only sees a password prompt, or could I even make it so that as long as they're logged into my website using OpenID, then the session would start automatically? > We'll provide a *.js file which can ask the user to install the plugin. > As it is at the moment not possible to host the plugin (only add ons)on > the mozilla site, we'll make it accessible on our site. Would it also be possible to host the plugin on our own apache sites without too much trouble? > I hope this will help - feel free to ask again. Thank you, just one more thing. When will it be available, and can you please make it yesterday? :) This sounds awesome! Thanks again. Jo-Erlend Schinstad

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Re: [X2go-dev] X2go-dev Digest, Vol 17, Issue 14
by brian mullan 24 May '10

24 May '10

Loadbalancer's don't necessarily have to have anything to do with x2go or NX for that matter although they can implement their own technique. There are several good articles out there on the topic including this one<http://1wt.eu/articles/2006_lb/> . Here is one implementation <http://haproxy.1wt.eu/> you could also use. And here is a HowToForge article on setting up an Apache Web Server load balancer<http://www.howtoforge.com/high_availability_loadbalanced_apache_cluster> If you use some of the "cloud" services setting up a load balancer is often very simple. On the Amazon Web Services (AWS) Cloud (ec2) you just start your "instance" that is the application(s) you want to use and more or less a single click/command adds your new server to an EC2 loadbalance<http://aws.amazon.com/elasticloadbalancing/>r that you then can specify criteria for. AWS has made it ridiculously simple. Matter of fact, AWS EC2 just implemented a new "service" which can track which instance (re virtual machine) a session belonged to and IF the session terminates abnormally, you can restart it and between the Load Balancer and AWS EC2 it will reattach it to the original instance/machine. Read about it hear on How to setup a Load Balancer with Sticky Sessions<http://www.shlomoswidler.com/2010/04/elastic-load-balancing-with-sticky-ses…>. Jeff Barr is the author and works for AWS. Brian Mullan On Mon, May 24, 2010 at 6:00 AM, <x2go-dev-request(a)lists.berlios.de> wrote: > Send X2go-dev mailing list submissions to > x2go-dev(a)lists.berlios.de > > To subscribe or unsubscribe via the World Wide Web, visit > https://lists.berlios.de/mailman/listinfo/x2go-dev > or, via email, send a message with subject or body 'help' to > x2go-dev-request(a)lists.berlios.de > > You can reach the person managing the list at > x2go-dev-owner(a)lists.berlios.de > > When replying, please edit your Subject line so it is more specific > than "Re: Contents of X2go-dev digest..." > > > Today's Topics: > > 1. x2go servers with load balancing (michel) > 2. Re: Does X2GO have support for scanning using a client-side > scanner? (rupi) > > > ---------------------------------------------------------------------- > > Message: 1 > Date: Sun, 23 May 2010 13:59:12 +0200 > From: michel <kamerun(a)immerda.ch> > To: x2go-dev(a)lists.berlios.de, kamerun(a)immerda.ch > Subject: [X2go-dev] x2go servers with load balancing > Message-ID: <4BF91890.5070800(a)immerda.ch> > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > hello, > > i use x2go with ubuntu and it works good, now i would like to install 2 > x2go lenny servers woth load-balancing. i don't use ldap, is it like > this that we must just install 2 machines with the same configuration > it means we have 2 dhcp server with the same ip or we must configure > somewhere something to have load balancing? i try to find out in the > documentation, but i did not found. > > michel > > > ------------------------------ > > Message: 2 > Date: Sun, 23 May 2010 15:31:34 +0200 > From: rupi <rupi(a)rantanplan.org> > To: x2go-dev(a)lists.berlios.de > Subject: Re: [X2go-dev] Does X2GO have support for scanning using a > client-side scanner? > Message-ID: <20100523133134.GE19269(a)rantanplan.org> > Content-Type: text/plain; charset="us-ascii" > > Hi, > > after a quick look in the saned documentation[1] i think setting up saned > on the clients and usinging sane with the sane-net backend shouldn't be > that > hard (though it requires a trusted network environment because there is no > authentication/authorization besides tcp wrapper support..). You may want > to tweak the users environment to set SANE_NET_HOSTS to her/his client pc. > > Including tunneling support over ssh in x2go for saned is probably a tricky > thing since sane uses a different tcp connection or control and data plus > it resolves the port exclusivly over services. > > But saned on the clients should ease the process for your users. > > /rupi > > 1: http://www.sane-project.org/docs.html > > -- > http://rantanplan.org/~rupi/ <http://rantanplan.org/%7Erupi/> || encrypt > email || use free software > fingerprint = 9639 0ABC AD2F 155F C96C FC78 3CFE 82C0 0AF9 AE3A >

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Does X2GO have support for scanning using a client-side scanner?
by Jo-Erlend Schinstad 23 May '10

23 May '10

One thing I've been longing for, is the possibility of scanning on the remote server using a scanner connected to the client. I noticed that 2X now supports this. Is it possible using x2go, or will it be possible in the future? Do you only implement stuff that can be done on all platforms, or will you make it possible using ubuntu clients even if it's not easily done for windows clients? Thanks. Jo-Erlend Schinstad

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Windows client crash ASSERT failure
by John A. Sullivan III 22 May '10

22 May '10

Hello, all. We installed the Trolltech Qt SDK for Windows and downloaded the x2goclient-3.0.1-4 tarball from x2go.obviously-nice.de/deb Before attempting any changes, we simply built and ran the project. It crashed with: ASSERT failure in QWidget: "Widgets must be created in the GUI thread.", file kernel/qwidget.cpp,line 1133 Invalid parameter passed to C runtime function We tracked this down to initStatusDlg(). In line 7559, it calls slotShowAdvancedStat(). On line 3966, it calls st.sync(). When it calls QWinSettingsPrivate::sync() RegFlushKey(writeHandle()), it blows up. What have we done wrong? Thanks - John

1 1

Build from source
by Pavel Lisý 21 May '10

21 May '10

Hello I'm trying to make binary packages for Fedora but I am little bit confused. I wonder if any "howto build it from scratch" exists? Can you give me some URL? Thanks Pavel

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Which Windows build environment
by John A. Sullivan III 19 May '10

19 May '10

Hello, all. I'm getting ready to build a Windows X2Go development environment to do some troubleshooting on some issues we have. What is the Windows build environment currently used by the development team. I'm in the process of installing eclipse but I know the CVS includes the KDevelop project file. I suppose it would be best if I used what the developers use. Thanks - John

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Windows fullscreen and clipboard parameters not passed
by John A. Sullivan III 19 May '10

19 May '10

Hello, all. I'm working on the problem where Windows clients do not honor the full screen setting nor pass clipboard information. I noticed in the thread which starts the Windows Xming server, void ONMainWindow::startXOrg (), that the Xming parameters appear to be hard set: args<<dispString<<"-multiwindow"<<"-notrayicon"<< "-logfile"<<xorgLogFile; xorg=new QProcess ( 0 ); xorg-> setWorkingDirectory ( appDir+"\\xming" ); xorg->setEnvironment ( env ); xorg->start ( appDir+"\\xming\\Xming.exe",args ); Before try to generate a patch to add -clipboard as a fixed setting and read the screen parameters from the settings file, I thought I should as, why do we not pass -clipboard and why do we not read the screen settings already? I certainly wouldn't want to waste any time if we already know -clipboard and either -rootless or -fullscreen are really bad ideas. If there are not reasons why this is not done, I can try to work on a patch tomorrow. I'm very unfamiliar with Qt on Windows (and am barely functional running it in KDevelop in Linux!). How does one normally build in Windows? Thanks - John

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Password handling and CAPS lock issues
by John A. Sullivan III 18 May '10

18 May '10

Hello, all. We have a problem with CAPS lock getting out of sync between the physical and virtual desktops. I assume this is the downside of the very powerful feature of being able to change physical computers connected to the same virtual session. However, it is more than annoying. Because X2Go attempts so many logins at once (separate SSH sessions for video, print, sound, file sharing), a wrong login quickly exhausts grace logins and can even trip our OSSEC active response as a perceived brute force intrusion attempt and lock out all computers from the same site. Perhaps password handling could be improved in two ways in X2Go. If the first password attempt fails, the user should be alerted and continued login attempts for other ssh sessions should cease. Secondly, the first failed attempt could be retried in reverse case. If it succeeds, a message should be displayed to the user. The problem could be either that their physical CAPS lock is on (in which case we do nothing but warn) or that the CAPS lock is out of sync, in which case we can offer to toggle the CAPS lock state on the virtual desktop. Is this possible? Is it reasonable? Thanks - John

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