x2go-dev January 2023

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Bug#1228: Ctrl-Alt-T doesn't terminate connection in "local desktop" sessions
by Alexey Nemov 30 May '23

30 May '23

Package: x2goserver Version: 4.0.1.20 Summary: As stated in the wiki https://wiki.x2go.org/doku.php/wiki:advanced:nx-keyboard-shortcuts The action "close_session" should terminate the session. But, pressing Ctrl-Alt-t in a "local desktop" session does not "terminate" the session. Steps to reproduce: 0. Create a new session profile in x2goclient with session type "Connect to local desktop"; 1. Connect to remote computer using this session profile; 2. Press Ctrl-Alt-t at the client. Expected behaviour: The remote desktop window on the client should close, the connection should be terminated. Actual behaviour: The remote desktop window on the client does not close, the connection is not terminated. The following log entries appears in the server's system journal: ``` Oct 26 13:50:39 localhost /usr/bin/x2gosuspend-session[31790]: session with ID alex-50-1508997021_stS1XSHADalexXSHADPP0_dp24 has been suspended successfully Oct 26 13:50:45 localhost su[31900]: Successful su for alex by root Oct 26 13:50:45 localhost su[31900]: + ??? root:alex Oct 26 13:50:45 localhost su[31900]: pam_unix(su:session): session opened for user alex by (uid=0) Oct 26 13:50:45 localhost systemd-logind[508]: New session c99 of user alex. Oct 26 13:50:45 localhost systemd[1]: Started Session c99 of user alex. Oct 26 13:50:46 localhost su[31900]: pam_unix(su:session): session closed for user alex Oct 26 13:50:46 localhost su[31923]: Successful su for alex by root Oct 26 13:50:46 localhost su[31923]: + ??? root:alex Oct 26 13:50:46 localhost su[31923]: pam_unix(su:session): session opened for user alex by (uid=0) Oct 26 13:50:46 localhost systemd-logind[508]: Removed session c99. Oct 26 13:50:46 localhost systemd-logind[508]: New session c100 of user alex. Oct 26 13:50:46 localhost systemd[1]: Started Session c100 of user alex. Oct 26 13:50:49 localhost /usr/bin/x2gosuspend-session[32026]: session with ID alex-50-1508997021_stS1XSHADalexXSHADPP0_dp24 has been suspended successfully Oct 26 13:50:50 localhost su[31923]: pam_unix(su:session): session closed for user alex Oct 26 13:50:50 localhost systemd-logind[508]: Removed session c100. Oct 26 13:50:53 localhost /usr/sbin/x2gocleansessions[12745]: alex-50-1508997021_stS1XSHADalexXSHADPP0_dp24: session status S desynchronized with current status (R) and session suspend already tried unsuccessfully ``` Other infomation: 0. Executing x2gosuspend-session <ID> on the server has the same effect as pressing C-A-t at the client. 1. Execuitng x2goterminate-session <ID> on the server does terminates the session and closes the client window. 3. Server-side /etc/x2go/keystrokes.cfg: http://paste.debian.net/plain/992795 -- System Information (server and client): Debian Release: 9.2 APT prefers stable-updates APT policy: (500, 'stable-updates'), (500, 'stable') Architecture: amd64 (x86_64) Foreign Architectures: i386 Kernel: Linux 4.9.0-4-amd64 (SMP w/2 CPU cores) Locale: LANG=en_US.utf8, LC_CTYPE=en_US.utf8 (charmap=UTF-8), LANGUAGE=en_US:en (charmap=UTF-8) Shell: /bin/sh linked to /bin/dash Init: systemd (via /run/systemd/system)

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Bug#1421: journalctl flooded with ssh_channel_accept: No channel request of this type from server
by Sorin T 10 Apr '23

10 Apr '23

Package: x2goclient Version: 4.1.2.1 This output is shown continuously. I have also disabled the Media and the Shared folders options. [2019/12/05 12:21:49.755356, 1] ssh_channel_accept: No channel request of this type from server [2019/12/05 12:21:49.844514, 1] ssh_channel_accept: No channel request of this type from server [2019/12/05 12:21:49.844968, 1] ssh_channel_accept: No channel request of this type from server [2019/12/05 12:21:50.345651, 1] ssh_channel_accept: No channel request of this type from server [2019/12/05 12:21:50.846330, 1] ssh_channel_accept: No channel request of this type from server [2019/12/05 12:21:51.347011, 1] ssh_channel_accept: No channel request of this type from server [2019/12/05 12:21:51.354536, 1] ssh_channel_accept: No channel request of this type from server [2019/12/05 12:21:51.355837, 1] ssh_channel_accept: No channel request of this type from server [2019/12/05 12:21:51.358011, 1] ssh_channel_accept: No channel request of this type from server [2019/12/05 12:21:51.858687, 1] ssh_channel_accept: No channel request of this type from server [2019/12/05 12:21:52.359381, 1] ssh_channel_accept: No channel request of this type from server [2019/12/05 12:21:52.860074, 1] ssh_channel_accept: No channel request of this type from server [2019/12/05 12:21:53.360787, 1] ssh_channel_accept: No channel request of this type from server It could be a ssh config problem ? I am using on client machine: OpenSSH_8.1p1, OpenSSL 1.1.1d 10 Sep 2019 Guest OS: Debian based Guest ssh version: OpenSSH_7.9p1 Debian-10, OpenSSL 1.1.1d 10 Sep 2019 Guest x2goserver: 4.1.0.3-4 Sent with [ProtonMail](https://protonmail.com) Secure Email.

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Bug#1597: Possible security vulnerability: x2goclient crashes calling ssh-keygen due to unsanitized arguments
by Peter O'Regan 31 Jan '23

31 Jan '23

Package: x2goclient Version: 4.1.2.2-2020.02.13 x2goclient assumes the path to its application data directory does not have any spaces or single-quotes, but these are legal path directories for users on Windows systems. As a result, if the path to the x2go directory contains spaces or apostrophes (C:/Users/O'Regan, for instance), the call will fail. I have experienced this error and can reproduce the failure behavior by calling ssh-keygen from the terminal. The fix, I think, is to add double quotes to open and close the "private_key_file" string sent to ssh-keygen on onmainwindow.cpp, line 11353, or to apply a dedicated sanitization function. Testing in the terminal: ssh-keygen -f C:\Users\O'Regan\.x2go\etc\mykeyfile will fail. ssh-keygen -f "C:\Users\O'Regan\.x2go\etc\mykeyfile" will succeed. There may be other places/program calls that also need sanitizing. This is also potentially security issue since it lets the program caller influence what arguments are sent to generate an SSH key by altering the "HOME" environment variable queried by qt in line 185 from QDir::homePath(). (I'm not sure how easy it is to change this or related environment variables mid-session, but I imagine it might be possible). The path appears as the final argument to ssh-keygen, so it will also overrule the preceding arguments. For instance, I could reduce the bit count for the key or key type to make the credential easier to brute-force. I am using Windows 11. Thank you, Peter

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Bug#1596: Windows 11 file sharing not working
by Krzysztof Kazanowicz 26 Jan '23

26 Jan '23

Package: x2goclient Version: 4.1.2.2 (Qt - 4.8.6) On Windows 11, when trying to mount a shared folder to remote Linux desktop, a cmd.exe window appears with error: /cygdrive/C/Users/dkopa/.x2go/etc/sshd_config line 3: Deprecated option UsePrivilegeSeparation and sharing doesn't work at all. On Windows 10 the problem was not present. This is a severe bug IMO as Windows 11 users can't share files.

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X2go crash on Fedora 37, port already in use?
by Robert Kudyba 07 Jan '23

07 Jan '23

4.1.0.3-19.fc37 See below logs. Any clues here? Surely there is a bug with all of these syntax errors: x2gocheckport: line 131: connect('dbname=/var/lib/x2go/x2go_sessions','',...): syntax error in expression (error token is "('dbname=/var/lib/x2go/x2go_sessions','',...)") /usr/lib64/x2go/x2gocheckport: line 131: connect('dbname=/var/lib/x2go/x2go_sessions','',...): syntax error in expression (error token is "('dbname=/var/lib/x2go/x2go_sessions','',...)") x2go-DEBUG-../src/sshmasterconnection.cpp:2165> EOF on channel 0x3e52a98; SshProcess object: 0 x2go-DEBUG-../src/sshmasterconnection.cpp:2222> EOF sent. x2go-DEBUG-../src/sshmasterconnection.cpp:2224> Channel closed. x2go-DEBUG-../src/sshprocess.cpp:532> SSH finished: raw output (stdout): "X2GODATABEGIN:6be57a1e-8bf3-4a28-a817-a3e07fba9b99 DBIconnect('dbname=/var/lib/x2go/x2go_sessions','',...)failed:unabletoopendatabasefileat/usr/share/perl5/vendor_perl/X2Go/Server/DB/SQLite3.pmline66. X2GODATAEND:6be57a1e-8bf3-4a28-a817-a3e07fba9b99 " x2go-DEBUG-../src/sshprocess.cpp:543> SSH finished: true - "DBIconnect('dbname=/var/lib/x2go/x2go_sessions','',...)failed:unabletoopendatabasefileat/usr/share/perl5/vendor_perl/X2Go/Server/DB/SQLite3.pmline66. " (0). x2go-DEBUG-../src/onmainwindow.cpp:3861> "DBIconnect('dbname=/var/lib/x2go/x2go_sessions','',...)failed:unabletoopendatabasefileat/usr/share/perl5/vendor_perl/X2Go/Server/DB/SQLite3.pmline66. " x2go-DEBUG-../src/onmainwindow.cpp:4349> Fullscreen: false x2go-DEBUG-../src/onmainwindow.cpp:10344> Resolved localhost. x2go-DEBUG-../src/onmainwindow.cpp:10372> Port already in use: 6000 x2go-DEBUG-../src/onmainwindow.cpp:10344> Resolved localhost. x2go-DEBUG-../src/onmainwindow.cpp:10366> Port is free: 6001 x2go-DEBUG-../src/onmainwindow.cpp:10434> Using internal X.Org Server: true x2go-DEBUG-../src/onmainwindow.cpp:10457> WxH:"800"x"600" x2go-DEBUG-../src/onmainwindow.cpp:10462> "-multiwindow -notrayicon -clipboard" x2go-DEBUG-../src/onmainwindow.cpp:10540> Running "C:/Program Files (x86)/x2goclient\vcxsrv\vcxsrv.exe" "-multiwindow -notrayicon -clipboard -nopn -silent-dup-error :1" x2go-DEBUG-../src/onmainwindow.cpp:10541> Trying to start X.Org Server on DISPLAY: 1 x2go-DEBUG-../src/onmainwindow.cpp:4521> Executing remote command: "X2GODPI=96 X2GO_XINERAMA=no x2gostartagent 800x600 adsl 16m-jpeg-9 unix-kde-depth_32 us auto 1 D MATE both" x2go-DEBUG-../src/sshprocess.cpp:199> Executing remote command via SshProcess object 1: "X2GODPI=96 X2GO_XINERAMA=no x2gostartagent 800x600 adsl 16m-jpeg-9 unix-kde-depth_32 us auto 1 D MATE both" x2go-DEBUG-../src/sshprocess.cpp:213> this=SshProcess(0x3e6d668) Running masterCon->addChannelConnection(this, ' "cdaddf08-7bca-498b-91b7-8331c7c9762c" ', ' "bash -l -c 'echo "X2GODATABEGIN:cdaddf08-7bca-498b-91b7-8331c7c9762c"; export PATH="/usr/local/bin:/usr/bin:/bin";export TERM="dumb"; X2GODPI=96 X2GO_XINERAMA=no x2gostartagent 800x600 adsl 16m-jpeg-9" '); x2go-DEBUG-../src/sshmasterconnection.cpp:1810> Locking SSH channel connection MUTEX. x2go-DEBUG-../src/sshmasterconnection.cpp:1812> Passing new channel connection object to channelConnections. x2go-DEBUG-../src/sshmasterconnection.cpp:1814> Unlocking SSH channel connection MUTEX. x2go-DEBUG-../src/sshmasterconnection.cpp:1977> Creating new channel. x2go-DEBUG-../src/sshmasterconnection.cpp:1990> New channel:0x3e52fc0 x2go-DEBUG-../src/sshmasterconnection.cpp:2065> Executing remote: "bash -l -c 'echo "X2GODATABEGIN:cdaddf08-7bca-498b-91b7-8331c7c9762c"; export PATH="/usr/local/bin:/usr/bin:/bin";export TERM="dumb"; X2GODPI=96 X2GO_XINERAMA=no x2gostartagent 800x600 adsl 16m-jpeg-9 unix-kde-depth_32 us auto 1 D MATE both; echo "X2GODATAEND:cdaddf08-7bca-498b-91b7-8331c7c9762c";'" x2go-DEBUG-../src/sshmasterconnection.cpp:2082> New exec channel created. x2go-DEBUG-../src/onmainwindow.cpp:10344> Resolved localhost. x2go-DEBUG-../src/onmainwindow.cpp:10372> Port already in use: 6001 x2go-DEBUG-../src/onmainwindow.cpp:10602> X.Org Server started on DISPLAY 1. x2go-DEBUG-../src/sshprocess.cpp:538> Have stderr only, something must be wrong. x2go-DEBUG-../src/sshprocess.cpp:543> SSH finished: false - "/usr/lib64/x2go/x2gocheckport: line 131: connect('dbname=/var/lib/x2go/x2go_sessions','',...): syntax error in expression (error token is "('dbname=/var/lib/x2go/x2go_sessions','',...)") /usr/lib64/x2go/x2gocheckport: line 131: connect('dbname=/var/lib/x2go/x2go_sessions','',...): syntax error in expression (error token is "('dbname=/var/lib/x2go/x2go_sessions','',...)") /usr/lib64/x2go/x2gocheckport: line 131: connect('dbname=/var/lib/x2go/x2go_sessions','',...): syntax error in expression (error token is "('dbname=/var/lib/x2go/x2go_sessions','',...)") /usr/lib64/x2go/x2gocheckport: line 131: connect('dbname=/var/lib/x2go/x2go_sessions','',...): syntax error in expression (error token is "('dbname=/var/lib/x2go/x2go_sessions','',...)") /usr/lib64/x2go/x2gocheckport: line 131: connect('dbname=/var/lib/x2go/x2go_sessions','',...): syntax error in expression (error token is "('dbname=/var/lib/x2go/x2go_sessions','',...)") /usr/lib64/x2go/x2gocheckport: line 131: connect('dbname=/var/lib/x2go/x2go_sessions','',...): syntax error in expression (error token is "('dbname=/var/lib/x2go/x2go_sessions','',...)") /usr/lib64/x2go/x2gocheckport: line 131: connect('dbname=/var/lib/x2go/x2go_sessions','',...): syntax error in expression (error token is "('dbname=/var/lib/x2go/x2go_sessions','',...)") /usr/lib64/x2go/x2gocheckport: line 131: connect('dbname=/var/lib/x2go/x2go_sessions','',...): syntax error in expression (error token is "('dbname=/var/lib/x2go/x2go_sessions','',...)") /usr/lib64/x2go/x2gocheckport: line 131: connect('dbname=/var/lib/x2go/x2go_sessions','',...): syntax error in expression (error token is "('dbname=/var/lib/x2go/x2go_sessions','',...)") /usr/lib64/x2go/x2gocheckport: line 131: connect('dbname=/var/lib/x2go/x2go_sessions','',...): syntax error in expression (error token is "('dbname=/var/lib/x2go/x2go_sessions','',...)") Unable to find free display port or insert new session into database; parameters: port (50), hostname (pascal.dsm.fordham.edu) and session name (). " (1). x2go-DEBUG-../src/onmainwindow.cpp:5425> Agent output: "/usr/lib64/x2go/x2gocheckport: line 131: connect('dbname=/var/lib/x2go/x2go_sessions','',...): syntax error in expression (error token is "('dbname=/var/lib/x2go/x2go_sessions','',...)") /usr/lib64/x2go/x2gocheckport: line 131: connect('dbname=/var/lib/x2go/x2go_sessions','',...): syntax error in expression (error token is "('dbname=/var/lib/x2go/x2go_sessions','',...)") /usr/lib64/x2go/x2gocheckport: line 131: connect('dbname=/var/lib/x2go/x2go_sessions','',...): syntax error in expression (error token is "('dbname=/var/lib/x2go/x2go_sessions','',...)") /usr/lib64/x2go/x2gocheckport: line 131: connect('dbname=/var/lib/x2go/x2go_sessions','',...): syntax error in expression (error token is "('dbname=/var/lib/x2go/x2go_sessions','',...)") /usr/lib64/x2go/x2gocheckport: line 131: connect('dbname=/var/lib/x2go/x2go_sessions','',...): syntax error in expression (error token is "('dbname=/var/lib/x2go/x2go_sessions','',...)") /usr/lib64/x2go/x2gocheckport: line 131: connect('dbname=/var/lib/x2go/x2go_sessions','',...): syntax error in expression (error token is "('dbname=/var/lib/x2go/x2go_sessions','',...)") /usr/lib64/x2go/x2gocheckport: line 131: connect('dbname=/var/lib/x2go/x2go_sessions','',...): syntax error in expression (error token is "('dbname=/var/lib/x2go/x2go_sessions','',...)") /usr/lib64/x2go/x2gocheckport: line 131: connect('dbname=/var/lib/x2go/x2go_sessions','',...): syntax error in expression (error token is "('dbname=/var/lib/x2go/x2go_sessions','',...)") /usr/lib64/x2go/x2gocheckport: line 131: connect('dbname=/var/lib/x2go/x2go_sessions','',...): syntax error in expression (error token is "('dbname=/var/lib/x2go/x2go_sessions','',...)") /usr/lib64/x2go/x2gocheckport: line 131: connect('dbname=/var/lib/x2go/x2go_sessions','',...): syntax error in expression (error token is "('dbname=/var/lib/x2go/x2go_sessions','',...)") Unable to find free display port or insert new session into database; parameters: port (50), hostname () and session name (). " x2go-DEBUG-../src/onmainwindow.cpp:1527> Close event received. x2go-DEBUG-../src/onmainwindow.cpp:1551> Quitting from tray icon and closing application. x2go-INFO-6> "Closing X2Go Client ..." x2go-DEBUG-../src/onmainwindow.cpp:1370> Saving settings ... x2go-DEBUG-../src/onmainwindow.cpp:1379> Saved settings. x2go-DEBUG-../src/onmainwindow.cpp:1401> Waiting for the SSH connection to finish ... x2go-DEBUG-../src/sshmasterconnection.cpp:764> SshMasterConnection, instance SshMasterConnection(0x3d1c518) waiting for thread to finish. x2go-DEBUG-../src/sshmasterconnection.cpp:1908> Disconnecting ... x2go-DEBUG-../src/sshmasterconnection.cpp:1917> Deleting channel connections. x2go-DEBUG-../src/sshmasterconnection.cpp:1923> Disconnecting session. x2go-DEBUG-../src/sshmasterconnection.cpp:1927> Deleting sockets. x2go-DEBUG-../src/sshmasterconnection.cpp:1932> All channels closed and session disconnected. Quitting session loop. cat /home/users/myuser/.x2go/S-myuser-50-1672505118_stDXFCE_dp24/session.log NXPROXY - Version 3.5.99.26 Info: Proxy running in server mode with pid '1283310'. Session: Starting session at 'Sat Dec 31 11:45:22 2022'. Info: Using errors file '/u/me/myuser/.x2go/S-myuser--1672505118_stDXFCE_dp24/sessions'. Info: Using stats file '/u/me/myuser/.x2go/S-50/stats'. Loop: WARNING! Overriding auxiliary X11 port with new value '1'. Warning: Overriding auxiliary X11 port with new value '1'. Info: Connecting to remote host 'localhost:32613'. Info: Connected to remote proxy on FD#5. Info: Connection with remote proxy completed. Loop: WARNING! Unrecognized session type 'unix-kde-depth_24'. Assuming agent session. Warning: Unrecognized session type 'unix-kde-depth_24'. Assuming agent session. Info: Using ADSL link parameters 1408/24/1/0. Info: Using cache parameters 4/4096KB/8192KB/8192KB. Info: Using pack method '16m-jpeg-9' with session 'unix-kde-depth_24'. Info: Using ZLIB data compression 1/1/32.Info: Using ZLIB stream compression 4/4. Info: No suitable cache file found. Info: Forwarding X11 connections to display 'localhost:10.0'. Info: Forwarding auxiliary X11 connections to display 'localhost:10.0'. Session: Session started at 'Sat Dec 31 11:45:25 2022'. Info: Established X server connection. Info: Using shared memory parameters 0/0K. Session: Terminating session at 'Sat Dec 31 11:46:05 2022'. Session: Session terminated at 'Sat Dec 31 11:46:05

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x2go-dev January 2023