x2go-dev June 2021

x2go-dev@lists.x2go.org

11 participants
88 discussions

Bug#1487: sftp-server is missing message (I do not need filetransfer)
by Zounp 24 Jun '21

24 Jun '21

Hello, This issue is still applicable. This is not a bug but a safety request. For my application I do not need folder sharing nor printing support. So I did not install: rdesktop, openssh-server nor openssh-sftp-server on the client computer Installing a server is a security risk. I do not want to install servers on my client computer (on which I am running x2goclient) So it is not a big issue but it is still annoying. So it would be so nice if the need for the sftp-server (folder sharing nor printing support) can be made optional via a setting for instance. Thanks for X2Go. Thanks. -- Met vriendelijke groet, Zounp

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Re: [X2Go-Dev] X2Go HTML plugin
by Mike Gabriel 22 Jun '21

22 Jun '21

Hi Alex, On Mi 21 Apr 2021 22:43:53 CEST, Oleksandr Shneyder wrote: > https://wiki.x2go.org/doku.php/wiki:advanced:x2gohtmlclient I am currently trying to provide an out-of-the-box DEB installation of x2gohtmlclient. For this, I need to make some adjustments, mainly these are about wss: traffic becoming optional and defaulting everything to localhost with ws: protocol. Of course, in real world deployments, this needs to SSL'ified again. But I'd really love to provide DEBs that demo x2gohtmlclient out-of-the-box (and SSL certificates are not so much things that come out of the box). This all seems to work fine, only that I get a failure when x2goclient.min.js starts communicating with the x2gokdrive Xserver (via x2gowswrapper, via websockify). I think that my seen bug is caused by my websockify 0.9 which has the text data mode removed (compared to earlier versions). See: https://github.com/novnc/websockify/issues/365#issuecomment-432270758 As I am testing everything on Debian 11, I indeed have websockify 0.9 installed. Where did you test the whole stack of x2gohtmlclient, x2goclient.min.js, x2gowebrpc and x2gowswrapper on? Debian 10, maybe? My symptom in the browser is: - Logon works - X2Go KDrive sessions starts in the background (processes come up, desktop is resumable via native X2Go Client later on) - X2Go Logo appears in the placeholder area in the webbrowser - X2Go session strings is shown at the top of the session window in the browser - and then, the session is immediately closed again. The (error) message(s) I get in the browser console while this happens are/is these/this: ``` WS Open Event {isTrusted: true, type: "open", target: WebSocket, currentTarget: WebSocket, eventPhase: 2, …} x2goclient.min.js:208 Sending geometry event: ArrayBuffer(41) Uint32Array(5) [7, 60294400, 0, 0, 0] Uint16Array(5) [7, 0, 1280, 920, 0] x2goclient.min.js:204 Sending client Version and OS: ArrayBuffer(41)byteLength: (...)__proto__: ArrayBuffer[[Int8Array]]: Int8Array(41)[[Uint8Array]]: Uint8Array(41)[[ArrayBufferByteLength]]: 41[[ArrayBufferData]]: "0x0fc800a0c030" Uint32Array(5) [10, 196612, 0, 0, 0]0: 101: 1966122: 03: 04: 0buffer: (...)byteLength: (...)byteOffset: (...)length: (...)Symbol(Symbol.toStringTag): (...)__proto__: TypedArray Uint16Array(5) [10, 0, 4, 3, 0]0: 101: 02: 43: 34: 0buffer: (...)byteLength: (...)byteOffset: (...)length: (...)Symbol(Symbol.toStringTag): (...)__proto__: TypedArray x2goclient.min.js:265 WS Close CloseEvent {isTrusted: true, wasClean: true, code: 1003, reason: "Unsupported: Text frames are not supported", type: "close", …} ``` Before I dig any deeper, could you try your test setups with websockify 0.9 and report back if you see a similar error popping up or not? Thanks, Mike -- DAS-NETZWERKTEAM c\o Technik- und Ökologiezentrum Eckernförde Mike Gabriel, Marienthaler Str. 17, 24340 Eckernförde mobile: +49 (1520) 1976 148 landline: +49 (4351) 850 8940 GnuPG Fingerprint: 9BFB AEE8 6C0A A5FF BF22 0782 9AF4 6B30 2577 1B31 mail: mike.gabriel(a)das-netzwerkteam.de, http://das-netzwerkteam.de

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Bug#1551: Remove setpdfwrite from cups-x2go
by Orion Poplawski 19 Jun '21

19 Jun '21

Package: cups-x2go ghostscript 9.54 removed setpdfwrite. Is is the patch that Fedora is carrying to deal with it. -- Orion Poplawski he/him/his - surely the least important thing about me Manager of NWRA Technical Systems 720-772-5637 NWRA, Boulder/CoRA Office FAX: 303-415-9702 3380 Mitchell Lane orion(a)nwra.com Boulder, CO 80301 https://www.nwra.com/

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Bug#581: VirtualBox Clipboard Sharing does not work when accessing the host over X2Go
by Michael DePaulo 18 Jun '21

18 Jun '21

Package: nx-libs Version: 3.5.0.27 Severity: normal If you run a VirtualBox VM with its display running under X2Go, the VM's clipboard sharing fails to work in either direction. You cannot copy and paste text between the VM and an app running under X2Go server, nor can you copy and paste text between the VM and an app running on the X2Go Client system. (I believe VirtualBox VMs use SDL to interact with the X server, which in this case is nxagent. This differs from the VirtualBox GUI, which is written in QT.) Specifically, when the X sesssion starts on the guest, a VirtualBox-provided script for X calls "VBoxClient --clipboard" to start the clipboard service. The service runs as the user logged into the guest. However, this service fails to stay running, and thus the clipboard sharing does not work. If you launch the VirtualBox VM on the local X.org X server, the guest's clipboard service stays running and clipboard sharing works. You can also launch the VM in RDP headless mode from x2go (so the VM does not render its display to any nxagent). In this use case, the clipboard service stays running and clipboard sharing works. The strange part is that the configuration of the host affects the behavior of the guest. It makes sense though because it's a bug in the guest's code to integrate with the host. Also, when you do call "VBoxClient --clipboard", it returns 0. And if you call it after the X11 session has already started, the problem still occurs. In x2goclient, I tried turning on and off the following setting, but it had no effect: Options -> Settings -> X-Server settings -> do not use primary clipboard My theory is that this is a bug in nx-libs, and that the bug is probably related to nx-libs being forked from such an old X.org codebase. It is worth looking into whether other SDL apps have clipboard trouble with X2Go on Ubuntu 14.04. (It's also worth testing an older release of Ubuntu as the host OS, since it would have an older release of SDL.) Host system: OS: Ubuntu 14.04.1 64-bit with latest bugfix & security updates nxagent: 2:3.5.0.27-0~446~ubuntu14.04.1 x2goserver: 4.0.1.15-0~847~ubuntu14.04.1 x2goserver-xsession: 4.0.1.15-0~847~ubuntu14.04.1 VirtualBox 4.3.14 (from download.virtualbox.org) "Shared Clipboard" is set to "Bidirectional" for the VM $ cat /etc/x2go/x2goagent.options | grep -v '^#' | grep -v '^$' X2GO_NXAGENT_DEFAULT_OPTIONS="" X2GO_NXAGENT_DEFAULT_OPTIONS+=" -extension XFIXES" X2GO_NXAGENT_DEFAULT_OPTIONS+=" -nolisten tcp" Guest OS: Ubuntu 12.04.5 64-bit with precise HWE stack, the virtual kernel, and all the latest bugfix & security updates OS-provided XFCE virtualbox-guest-dkms: 4.1.12-dfsg-2ubuntu0.6 virtualbox-guest-utils: 4.1.12-dfsg-2ubuntu0.6 virtualbox-guest-x11: 4.1.12-dfsg-2ubuntu0.6 Configured according to: https://github.com/mikedep333/duckpan-vagrant/tree/duckduckhack-vm The aforementioned script is: /etc/X11/Xsession.d/98vboxadd-xclient (I'm sure a different script would be used for distros like CentOS which lack the /etc/X11/Xsession.d/ folder). Client system: Windows 8.1 64-bit with Update 1 and all the minor/monthly updates available X2GoClient 4.0.2.1+hotfix1+build3

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XFCE systray coredumps in Fedora 33
by Robert Kudyba 17 Jun '21

17 Jun '21

Using x2goserver-4.1.0.3-9.fc33.x86_64 with XFCE we see coredumps and I have a Bugzilla entry for it at https://bugzilla.redhat.com/show_bug.cgi?id=1722869 I included a gdb/backtrace and here's where it seg faults: panel-6-systray: segfault at f8 ip 00007fcf8849412d sp 00007ffd1ccad650 error 4 in libgdk-3.so.0.2404.25[7fcf88439000+82000] I can share the coredumps if needed.

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X2Go Client Nightly builds for debian bullseye
by Oleksandr Shneyder 16 Jun '21

16 Jun '21

Hi guys, I just checked the Jenkins and I could see that there are some issues building the X2Go Client heuler packages for bullseye. Looks like the problem is in qt4 build dependencies, which is not available in bullseye anymore. I don't want to get involved in the packaging process, but I think it's very important to have the nightly builds working for debian testing. What do you think about it? regards, Alex -- ----------------------------------------------------------- Oleksandr Shneyder | Email: o.shneyder(a)phoca-gmbh.de phoca GmbH | Tel. : 0911 - 14870374 0 Schleiermacherstr. 2 | Fax. : 0911 - 14870374 9 D-90491 Nürnberg | Mobil: 0163 - 49 64 461 Geschäftsführung: Dipl.-Inf. Oleksandr Shneyder Amtsgericht München | http://www.phoca-gmbh.de HRB 196 658 | http://www.x2go.org USt-IdNr.: DE281977973 -----------------------------------------------------------

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Update Fedora dependencies
by Ulrich Sibiller 07 Jun '21

07 Jun '21

https://www.spinics.net/lists/fedora-devel/msg280134.html mentions x2goserver needs to be adapted.

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Bug#1550: X2Go/Server/DB/SQLite3.pm: Reads shadow entry ($pass) but it is never used
by Paul Menzel 02 Jun '21

02 Jun '21

Package: x2goserver Version: 4.1.0.3 Dear X2Go folks, We noticed, that every two seconds our “shadow server” (similar to NIS) gets a request for the shadow line of the x2go user [1]. Tracing this reveals: x2gocleansessio-3593 [112] .... 2334059.441996: sys_clone <-system_call_exception <...>-468193 [120] .... 2334059.538048: sys_clone <-system_call_exception <...>-468194 [128] .... 2334059.539367: sys_clone <-system_call_exception x2golistsession-468193 [120] .... 2334059.542178: sys_clone <-system_call_exception libx2go-server--468196 [136] .... 2334059.656827: tcp_connect <-tcp_v4_connect x2gocleansessio-3593 [112] .... 2334059.695737: sys_clone <-system_call_exception <...>-468197 [128] .... 2334059.793699: sys_clone <-system_call_exception x2gopath-468198 [137] .... 2334059.794604: sys_clone <-system_call_exception x2gogetstatus-468197 [128] .... 2334059.797066: sys_clone <-system_call_exception <...>-468200 [097] .... 2334059.912926: tcp_connect <-tcp_v4_connect /sys/kernel/debug/tracing# ps -fp 3593 UID PID PPID C STIME TTY TIME CMD root 3593 1 0 May06 ? 00:36:27 /usr/bin/perl /usr/sbin/x2gocleansessions and (for example the first `libx2go-server-db-sqlite3-wrapper`) → `/usr/share/perl5/X2Go/Server/DB/SQLite3.pm` contains: my ($uname, $pass, $uid, $pgid, $quota, $comment, $gcos, $homedir, $shell, $expire) = getpwnam($x2gouser); my $dbfile="$homedir/x2go_sessions"; > The getpwnam() function returns a pointer to a structure containing the > broken-out fields of the record in the password database (e.g., the lo‐ > cal password file /etc/passwd, NIS, and LDAP) that matches the username > name. Reading `/usr/share/perl5/X2Go/Server/DB/SQLite3.pm` [2] it looks like, the variable `$pass` is never used? ``` sub init_db { # retrieve home dir of x2gouser my $x2gouser='x2gouser'; my ($uname, $pass, $uid, $pgid, $quota, $comment, $gcos, $homedir, $shell, $expire) = getpwnam($x2gouser); my $dbfile="$homedir/x2go_sessions"; my $dbh=DBI->connect("dbi:SQLite:dbname=$dbfile","","",{sqlite_use_immediate_transaction => 1, AutoCommit => 1, }) or die $_; # on SLE 11.x the sqlite_busy_timeout function does not exist, trying to work around that... if ( $dbh->can('sqlite_busy_timeout') ) { $dbh->sqlite_busy_timeout( 2000 ); } return $dbh; } ``` Kind regards, Paul [1]: https://salsa.debian.org/debian-remote-team/x2goserver/-/blob/master/x2gose… [2]: https://code.x2go.org/gitweb?p=x2goserver.git;a=blob;f=X2Go/Server/DB/SQLit…

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x2go-dev June 2021