debian buster Computers can’t be accessed

[yann972]

Hi,

On pcprof, I've installed veyon-master :

root@pcprof:~# dpkg -l |grep veyon
ii  libveyon-core:amd64                   4.5.3+repack1-1                 amd64        Computer Monitoring and Classroom Management Software - libraries
ii  veyon-configurator                    4.5.3+repack1-1                 amd64        Computer Monitoring and Classroom Management Software - configurator
ii  veyon-master                          4.5.3+repack1-1                 amd64        Computer Monitoring and Classroom Management Software - master
ii  veyon-plugins:amd64                   4.5.3+repack1-1                 amd64        Computer Monitoring and Classroom Management Software - plugins
ii  veyon-service                         4.5.3+repack1-1                 amd64        Computer Monitoring and Classroom Management Software - client service

I use login identification, and add one pc in location and computer (pc2 with his IP).
I've exported the VeyonMaster.json.

On the client (pc2), I've installed veyon-service libveyon-core veyon-configurator veyon-plugins:

root@pc2:~# dpkg -l |grep veyon
ii  libveyon-core:amd64                   4.5.3+repack1-1                 amd64        Computer Monitoring and Classroom Management Software - libraries
ii  veyon-configurator                    4.5.3+repack1-1                 amd64        Computer Monitoring and Classroom Management Software - configurator
ii  veyon-plugins:amd64                   4.5.3+repack1-1                 amd64        Computer Monitoring and Classroom Management Software - plugins
ii  veyon-service                         4.5.3+repack1-1                 amd64        Computer Monitoring and Classroom Management Software - client service

I've imported VeyonMaster.json (not sure it's necessary).

When I try to monitor from pcprof this PC (pc2) with veyon master , it's said: "access denied or authentification failed"

On the client (pc2), I've this:

# systemctl status veyon
● veyon.service - Veyon Service
     Loaded: loaded (/lib/systemd/system/veyon.service; enabled; vendor preset: enabled)
     Active: active (running) since Wed 2021-09-22 08:12:59 AST; 5min ago
       Docs: man:veyon-service(1)
   Main PID: 3703 (veyon-service)
      Tasks: 7 (limit: 14244)
     Memory: 18.0M
        CPU: 1min 9.207s
     CGroup: /system.slice/veyon.service
             ├─3703 /usr/bin/veyon-service
             ├─3707 /usr/bin/veyon-server
             └─3710 /usr/bin/x11vnc -localhost -nosel -nosetclipboard -rfbport 11200 -rfbportv6 11200 -no6 -passwdfile rm:/tmp/Temp-139873bb-5fe3-4f17-8fef-89a27037fd99/Veyon.HiOJfe -foreve>

sept. 22 08:18:12 pc2 veyon-auth-helper[4192]: pam_unix(login:auth): check pass; user unknown
sept. 22 08:18:12 pc2 veyon-auth-helper[4192]: pam_unix(login:auth): authentication failure; logname= uid=0 euid=0 tty= ruser= rhost=
sept. 22 08:18:16 pc2 veyon-auth-helper[4194]: pam_unix(login:auth): check pass; user unknown
sept. 22 08:18:16 pc2 veyon-auth-helper[4194]: pam_unix(login:auth): authentication failure; logname= uid=0 euid=0 tty= ruser= rhost=
sept. 22 08:18:22 pc2 veyon-auth-helper[4195]: pam_unix(login:auth): check pass; user unknown
sept. 22 08:18:22 pc2 veyon-auth-helper[4195]: pam_unix(login:auth): authentication failure; logname= uid=0 euid=0 tty= ruser= rhost=
sept. 22 08:18:27 pc2 veyon-auth-helper[4196]: pam_unix(login:auth): check pass; user unknown
sept. 22 08:18:27 pc2 veyon-auth-helper[4196]: pam_unix(login:auth): authentication failure; logname= uid=0 euid=0 tty= ruser= rhost=
sept. 22 08:18:33 pc2 veyon-auth-helper[4197]: pam_unix(login:auth): check pass; user unknown
sept. 22 08:18:33 pc2 veyon-auth-helper[4197]: pam_unix(login:auth): authentication failure; logname= uid=0 euid=0 tty= ruser= rhost=

What is wrong with the authentification (authentification failure) ?

More information:
on pcprof:

root@pcprof# netstat -lapute |grep veyon
tcp        0      0 localhost:11300         0.0.0.0:*               LISTEN      root       178231     7254/veyon-server   
tcp6       0      0 [::]:11100              [::]:*                  LISTEN      root       178234     7254/veyon-server

on client (pc2):

root@pc2:~# netstat -lapute |grep veyon
tcp        0      0 localhost:11300         0.0.0.0:*               LISTEN      root       179890     5884/veyon-server  
tcp6       0      0 [::]:11100              [::]:*                  LISTEN      root       179893     5884/veyon-server

On pcprof and pc2, no firewall:

# iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination         

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination         

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

And I can ping pc2 from pcprof
Thanks for help.

[yann972]

I've just read this on the doc:
This method (logon authentication) requires identical user accounts to exist on all computers.

So it means that the user on pcprof has to be the same than the user on pc2 ?
In my my case, user on pcprof is prof and pc2 is eleve. Maybe that's the problem authentification reason ?

Thanks for your help.

[yann972]

ok it works now.
It's necessary to have the same user on pcprof (veyon master) and pc2 (client) if you use logon authentification, and then export the configuration (json file) from pcprof to pc2.

I think I will use the key authentification in the future, not to have the same user on pcprof.

[tobydox]

@yann972 I'm happy to hear you solved the issues. Key file authentication indeed is the way to go here. I also recommend to remove the packages from Debian/Ubuntu and install the official all-in-one package which can be downloaded from our website.

[yann972]

"install the official all-in-one package which can be downloaded from our website"
Is it possible to have the adress of a repository that could be added in /etc/apt/source.list instead of download the package via the website ? (For debian)