xrdp (tries to) start an "Xvnc" session even if "Xorg" selected in greeter #2614

cwseys · 2023-03-29T18:02:21Z

cwseys
Mar 29, 2023

Hi all,
We're trying to debug why xrdp is trying to start an Xvnc session (and failing) when Xorg is selected in the greeter drop down menu. Interestingly if Xvnc is selected then the session starts successfully.
Note in the xrdp.log output below libxup.so is chosen, which indicates at some level the Xorg selection is transmitted (or libvnc.so would be chosen):
xrdp.log

[....]
[20230329-12:29:14] [DEBUG] Login state change request WMLS_USER_PROMPT -> WMLS_START_CONNECT
[20230329-12:29:14] [DEBUG] xrdp_wm_login_mode_changed: login_mode is 2
[20230329-12:29:14] [TRACE] xrdp_mm_check_chan:
[20230329-12:29:14] [DEBUG] Login state change request WMLS_START_CONNECT -> WMLS_CONNECT_IN_PROGRESS
[20230329-12:29:14] [DEBUG] xrdp_wm_log_msg: connecting to sesman on 127.0.0.1:3350
[20230329-12:29:14] [INFO ] connecting to sesman on 127.0.0.1:3350
[20230329-12:29:14] [INFO ] xrdp_wm_log_msg: sesman connect ok
[20230329-12:29:14] [INFO ] sesman connect ok
[20230329-12:29:14] [DEBUG] xrdp_wm_log_msg: sending login info to session manager. Please wait...
[20230329-12:29:14] [INFO ] sending login info to session manager. Please wait...
[20230329-12:29:14] [DEBUG] xrdp_wm_login_mode_changed: login_mode is 3
[20230329-12:29:15] [INFO ] xrdp_wm_log_msg: login successful for user xxx on display 11
[20230329-12:29:15] [INFO ] login successful for user xxx on display 11
[20230329-12:29:15] [INFO ] loaded module 'libxup.so' ok, interface size 10296, version 4
[20230329-12:29:15] [DEBUG] xrdp_wm_log_msg: started connecting
[20230329-12:29:15] [INFO ] started connecting
[20230329-12:29:15] [INFO ] lib_mod_connect: connecting via TCP socket
[20230329-12:29:16] [DEBUG] xrdp_wm_log_msg: connected ok
[20230329-12:29:16] [INFO ] connected ok

xrdp-sesman.log
Note "Starting X server on display 11: Xvnc :11....."
instead of

Starting X server on display 11: Xorg:11....."
`[20230329-12:28:59] [TRACE] config loaded in main at sesman.c:753
[20230329-12:28:59] [TRACE]     sesman_ini        = /etc/xrdp/sesman.ini
[20230329-12:28:59] [TRACE]     listen_address    = 127.0.0.1
[20230329-12:28:59] [TRACE]     listen_port       = 3350
[20230329-12:28:59] [TRACE]     enable_user_wm    = 1
[20230329-12:28:59] [TRACE]     default_wm        = /usr/libexec/xrdp/startwm-bash.sh
[20230329-12:28:59] [TRACE]     user_wm           = startwm.sh
[20230329-12:28:59] [TRACE]     reconnect_sh      = /usr/libexec/xrdp/reconnectwm.sh
[20230329-12:28:59] [TRACE]     auth_file_path    = (null)
[20230329-12:28:59] [DEBUG] libscp initialized
[20230329-12:28:59] [INFO ] starting xrdp-sesman with pid 31761
[20230329-12:28:59] [DEBUG] sesman_create_listening_transport: address 127.0.0.1 port 3350
[20230329-12:29:14] [INFO ] Socket 12: AF_INET6 connection received from ::1 port 55450
[20230329-12:29:15] [DEBUG] session_get_bydata: search policy 0 U xxx W 1920 H 1080 bpp 24 T 2 IP ::ffff:1
0.130.33.223:59595 - socket: 12
[20230329-12:29:15] [INFO ] Terminal Server Users group is disabled, allowing authentication
[20230329-12:29:15] [INFO ] ++ created session (access granted): username xxx, ip ::ffff:10.130.33.223:595
95 - socket: 12
[20230329-12:29:15] [INFO ] starting Xvnc session...
[20230329-12:29:15] [INFO ] Found X server running at /tmp/.X11-unix/X10
[20230329-12:29:15] [DEBUG] Did not find a running X server at /tmp/.X11-unix/X11
[20230329-12:29:15] [DEBUG] Did not find a running X server at /tmp/.X11-lock
[20230329-12:29:15] [DEBUG] Closed socket 13 (AF_INET6 :: port 5911)
[20230329-12:29:15] [DEBUG] Did not find a running X server at 5911
[20230329-12:29:15] [DEBUG] Closed socket 13 (AF_INET6 :: port 6011)
[20230329-12:29:15] [DEBUG] Did not find a running X server at 6011
[20230329-12:29:15] [DEBUG] Closed socket 13 (AF_INET6 :: port 6211)
[20230329-12:29:15] [DEBUG] Did not find a running X server at 6211
[20230329-12:29:15] [DEBUG] Did not find a running X server at /run/xrdp/xrdp_chansrv_socket_11
[20230329-12:29:15] [DEBUG] Did not find a running X server at /run/xrdp/xrdp_chansrv_audio_out_socket_11
[20230329-12:29:15] [DEBUG] Did not find a running X server at /run/xrdp/xrdp_chansrv_audio_in_socket_11
[20230329-12:29:15] [DEBUG] Did not find a running X server at /run/xrdp/xrdpapi_11
[20230329-12:29:15] [INFO ] Starting session: session_pid 31805, display :11.0, width 1920, height 1080, bpp
24, client ip ::ffff:10.130.33.223:59595 - socket: 12, user name xxx
[20230329-12:29:15] [INFO ] [session start] (display 11): calling auth_start_session from pid 31805
[20230329-12:29:15] [ERROR] sesman_data_in: scp_process_msg failed
[20230329-12:29:15] [ERROR] sesman_main_loop: trans_check_wait_objs failed, removing trans
[20230329-12:29:15] [DEBUG] Closed socket 11 (AF_INET6 ::1 port 3350)
[20230329-12:29:15] [DEBUG] Closed socket 12 (AF_INET6 ::1 port 3350)
[20230329-12:29:15] [DEBUG] Closed socket 12 (AF_INET6 ::1 port 3350)
[20230329-12:29:15] [DEBUG] Waiting for X server to start on display 11
[20230329-12:29:15] [DEBUG] Waiting for X server to start on display 11
[20230329-12:29:16] [INFO ] Starting X server on display 11: Xvnc :11 -auth .Xauthority -geometry 1920x1080 -depth 24 -rfbauth /afs/xxx.edu/home/xxx/.vnc/[email protected]:11 -bs -nolisten tcp -localhost -dpi 96
[20230329-12:29:16] [DEBUG] Did not find a running X server at /tmp/.X11-unix/X11
[20230329-12:29:16] [DEBUG] Did not find a running X server at /tmp/.X11-unix/X11
[20230329-12:29:16] [DEBUG] Calling exec (executable: Xvnc, arguments: Xvnc :11 -auth .Xauthority -geometry 1920x1080 -depth 24 -rfbauth /afs/xxx.edu/home/xxx/.vnc/[email protected]:11 -bs -nolisten tcp -localhost -dpi 96)
[20230329-12:29:16] [DEBUG] Did not find a running X server at /tmp/.X11-lock
[20230329-12:29:16] [DEBUG] Did not find a running X server at /tmp/.X11-lock
[20230329-12:29:16] [INFO ] Found X server running at /tmp/.X11-unix/X11
[20230329-12:29:16] [INFO ] Found X server running at /tmp/.X11-unix/X11
[20230329-12:29:16] [INFO ] Found X server running at /tmp/.X11-unix/X11
[20230329-12:29:16] [DEBUG] The user session on display 11 did not request a specific window manager
[20230329-12:29:16] [INFO ] Session started successfully for user xxx on display 11
[20230329-12:29:16] [INFO ] Starting the xrdp channel server for display 11
[20230329-12:29:16] [DEBUG] The user home directory window manager configuration is enabled but window manager program does not exist: /afs/xxx.edu/home/xxx/startwm.sh
[20230329-12:29:16] [INFO ] Session in progress on display 11, waiting until the window manager (pid 31809) exits to end the session
[20230329-12:29:16] [DEBUG] Calling exec (executable: /usr/sbin/xrdp-chansrv, arguments: /usr/sbin/xrdp-chansrv)
[20230329-12:29:16] [INFO ] Starting the default window manager on display 11: /usr/libexec/xrdp/startwm-bash.sh
[20230329-12:29:16] [DEBUG] waiting for pid 31809 to exit
[20230329-12:29:16] [DEBUG] Calling exec (executable: /usr/libexec/xrdp/startwm-bash.sh, arguments: /usr/libexec/xrdp/startwm-bash.sh )

Anyone have ideas about how xrdp decides to run Xvnc instead of Xorg? Running CentOS 7 and xrdp 0.9.21.

Thanks!
C.

Answered by matt335672

Mar 30, 2023

What are the two sections looking like in xrdp.ini and sesman.ini?

View full answer

matt335672 · 2023-03-30T09:36:28Z

matt335672
Mar 30, 2023
Collaborator

What are the two sections looking like in xrdp.ini and sesman.ini?

4 replies

cwseys Mar 30, 2023
Author

Hi Matt,
I think the settings are mostly defaults...
sesman.ini:

[Xorg]
; CentOS 7              :  param=/usr/bin/Xorg or param=Xorg
;
param=Xorg
; Leave the rest paramaters as-is unless you understand what will happen.
param=-config
param=xrdp/xorg.conf
param=-noreset
param=-nolisten
param=tcp
param=-logfile
param=.xorgxrdp.%s.log

[Xvnc]
param=Xvnc
param=-bs
param=-nolisten
param=tcp
param=-localhost
param=-dpi
param=96

xrdp.ini

[Xorg]
name=Xorg
lib=libxup.so
username=ask
password=ask
ip=127.0.0.1
port=-1
[Xvnc]
name=Xvnc
lib=libvnc.so
username=ask
password=ask
ip=127.0.0.1
port=-1

Thank you!

matt335672 Mar 30, 2023
Collaborator

In xrdp.ini, you're missing a code=20 line. From the source:-

xrdp/xrdp/xrdp.ini.in

Lines 235 to 241 in 177707d

    
           [Xorg] 
        
           name=Xorg 
        
           lib=libxup.@lib_extension@ 
        
           username=ask 
        
           password=ask 
        
           port=-1 
        
           code=20

cwseys Mar 30, 2023
Author

OMG! That fixed it!

I think my problem arose because sometimes commented out settings in config files mean "these are the defaults, uncomment if you want to change them" and other times mean "this is disabled, uncomment if you want it to be active". In the [Xorg] case, it means "disabled, uncomment to activate".

Thank you many times!
C.

matt335672 Mar 31, 2023
Collaborator

It's a fairly shonky bit of the config, but now it's in the public interface we're sort-of stuck with it.

Glad we got it sorted out for you.

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