xrdp: Cannot open /dev/tty0 (Permission denied) - Debian 9.4

Hello!

I know this has been reported like thousand times but I really cannot wrap my head around it. I have compiled both xrdp and xorgxrdp from source on Debian stretch and it has been working well so far until suddenly it doesn’t anymore. I believe some update has broken it but I am not able to pinpoint which one.

xVNC backend still works, but xorg backend fails with the following everytime I start a session:

[    19.449]
X.Org X Server 1.19.2
Release Date: 2017-03-02
[    19.449] X Protocol Version 11, Revision 0
[    19.449] Build Operating System: Linux 4.9.0-4-arm64 aarch64 Debian
[    19.449] Current Operating System: Linux rock64 4.4.126-rockchip-ayufan-239 #1 SMP Sun May 27 18:38:24 UTC 2018 aarch64
[    19.449] Kernel command line: rw root=LABEL=linux-root rootwait rootfstype=ext4 panic=10 init=/sbin/init coherent_pool=1M ethaddr=ea:36:e6:fe:e4:45 eth1addr=ea:36:e6:fe:e4:65 serial=412ad2801a30d12 cgroup_enable=cpuset cgroup_memory=1 cgroup_enable=memory swapaccount=1
[    19.449] Build Date: 16 October 2017  08:11:43AM
[    19.449] xorg-server 2:1.19.2-1+deb9u2 (https://www.debian.org/support)
[    19.449] Current version of pixman: 0.34.0
[    19.450]    Before reporting problems, check http://wiki.x.org
        to make sure that you have the latest version.
[    19.450] Markers: (--) probed, (**) from config file, (==) default setting,
        (++) from command line, (!!) notice, (II) informational,
        (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[    19.450] (++) Log file: ".xorgxrdp.10.log", Time: Thu Jun 28 11:27:28 2018
[    19.457] (++) Using config file: "/etc/X11/xrdp/xorg.conf"
[    19.457] (==) Using config directory: "/etc/X11/xorg.conf.d"
[    19.457] (==) Using system config directory "/usr/share/X11/xorg.conf.d"
[    19.458] (==) ServerLayout "X11 Server"
[    19.458] (**) |-->Screen "Screen (xrdpdev)" (0)
[    19.458] (**) |   |-->Monitor "Monitor"
[    19.458] (**) |   |-->Device "Video Card (xrdpdev)"
[    19.458] (**) |   |-->GPUDevice "Rockchip Graphics"
[    19.458] (**) |   |-->GPUDevice "Video Card (xrdpdev)"
[    19.458] (**) |-->Input Device "xrdpMouse"
[    19.458] (**) |-->Input Device "xrdpKeyboard"
[    19.458] (**) Option "DontVTSwitch" "on"
[    19.458] (**) Option "AutoAddDevices" "off"
[    19.458] (**) Not automatically adding devices
[    19.458] (==) Automatically enabling devices
[    19.458] (==) Automatically adding GPU devices
[    19.458] (==) Max clients allowed: 256, resource mask: 0x1fffff
[    19.459] (WW) The directory "/usr/share/fonts/X11/cyrillic" does not exist.
[    19.459]    Entry deleted from font path.
[    19.459] (==) FontPath set to:
        /usr/share/fonts/X11/misc,
        /usr/share/fonts/X11/100dpi/:unscaled,
        /usr/share/fonts/X11/75dpi/:unscaled,
        /usr/share/fonts/X11/Type1,
        /usr/share/fonts/X11/100dpi,
        /usr/share/fonts/X11/75dpi,
        built-ins
[    19.459] (==) ModulePath set to "/usr/lib/xorg/modules"
[    19.459] (II) Loader magic: 0x558f93edc8
[    19.459] (II) Module ABI versions:
[    19.459]    X.Org ANSI C Emulation: 0.4
[    19.459]    X.Org Video Driver: 23.0
[    19.459]    X.Org XInput driver : 24.1
[    19.459]    X.Org Server Extension : 10.0
[    19.468] (II) systemd-logind: took control of session /org/freedesktop/login1/session/c1
[    19.470] (II) xfree86: Adding drm device (/dev/dri/card0)
[    19.471] (EE) systemd-logind: failed to take device /dev/dri/card0: Operation not permitted
[    19.471] (II) no primary bus or device found
[    19.471]    falling back to /sys/devices/platform/display-subsystem/drm/card0
[    19.472] (II) "glx" will be loaded. This was enabled by default and also specified in the config file.
[    19.472] (II) LoadModule: "dbe"
[    19.472] (II) Module "dbe" already built-in
[    19.472] (II) LoadModule: "ddc"
[    19.472] (II) Module "ddc" already built-in
[    19.472] (II) LoadModule: "extmod"
[    19.472] (II) Module "extmod" already built-in
[    19.472] (II) LoadModule: "glx"
[    19.472] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so
[    19.477] (II) Module glx: vendor="X.Org Foundation"
[    19.477]    compiled for 1.19.2, module version = 1.0.0
[    19.477]    ABI class: X.Org Server Extension, version 10.0
[    19.477] (II) LoadModule: "int10"
[    19.477] (II) Loading /usr/lib/xorg/modules/libint10.so
[    19.486] (II) Module int10: vendor="X.Org Foundation"
[    19.486]    compiled for 1.19.2, module version = 1.0.0
[    19.486]    ABI class: X.Org Video Driver, version 23.0
[    19.486] (II) LoadModule: "record"
[    19.486] (II) Module "record" already built-in
[    19.486] (II) LoadModule: "vbe"
[    19.486] (II) Loading /usr/lib/xorg/modules/libvbe.so
[    19.489] (II) Module vbe: vendor="X.Org Foundation"
[    19.489]    compiled for 1.19.2, module version = 1.1.0
[    19.489]    ABI class: X.Org Video Driver, version 23.0
[    19.489] (II) LoadModule: "xorgxrdp"
[    19.489] (II) Loading /usr/lib/xorg/modules/libxorgxrdp.so
[    19.497] (II) Module XORGXRDP: vendor="X.Org Foundation"
[    19.497]    compiled for 1.19.2, module version = 0.2.7
[    19.497]    ABI class: X.Org Video Driver, version 23.0
[    19.497] xorgxrdpSetup:
[    19.497] (II) LoadModule: "fb"
[    19.497] (II) Loading /usr/lib/xorg/modules/libfb.so
[    19.505] (II) Module fb: vendor="X.Org Foundation"
[    19.505]    compiled for 1.19.2, module version = 1.0.0
[    19.505]    ABI class: X.Org ANSI C Emulation, version 0.4
[    19.505] (II) LoadModule: "xrdpdev"
[    19.505] (II) Loading /usr/lib/xorg/modules/drivers/xrdpdev_drv.so
[    19.512] (II) Module XRDPDEV: vendor="X.Org Foundation"
[    19.512]    compiled for 1.19.2, module version = 0.2.7
[    19.512]    ABI class: X.Org Video Driver, version 23.0
[    19.512] xrdpdevSetup:
[    19.512] (II) LoadModule: "modesetting"
[    19.512] (II) Loading /usr/lib/xorg/modules/drivers/modesetting_drv.so
[    19.512] (II) Module modesetting: vendor="X.Org Foundation"
[    19.513]    compiled for 1.19.2, module version = 1.19.2
[    19.513]    Module class: X.Org Video Driver
[    19.513]    ABI class: X.Org Video Driver, version 23.0
[    19.513] (II) LoadModule: "xrdpmouse"
[    19.513] (II) Loading /usr/lib/xorg/modules/input/xrdpmouse_drv.so
[    19.515] (II) Module XRDPMOUSE: vendor="X.Org Foundation"
[    19.515]    compiled for 1.19.2, module version = 0.2.7
[    19.515]    Module class: X.Org XInput Driver
[    19.515]    ABI class: X.Org XInput driver, version 24.1
[    19.515] rdpmousePlug:
[    19.515] (II) LoadModule: "xrdpkeyb"
[    19.515] (II) Loading /usr/lib/xorg/modules/input/xrdpkeyb_drv.so
[    19.518] (II) Module XRDPKEYB: vendor="X.Org Foundation"
[    19.518]    compiled for 1.19.2, module version = 0.2.7
[    19.518]    Module class: X.Org XInput Driver
[    19.518]    ABI class: X.Org XInput driver, version 24.1
[    19.518] rdpkeybPlug:
[    19.518] rdpIdentify:
[    19.518] (II) XRDPDEV: driver for xrdp: XRDPDEV
[    19.518] rdpDriverFunc: op 10
[    19.518] (II) modesetting: Driver for Modesetting Kernel Drivers: kms
[    19.518] (EE)
Fatal server error:
[    19.518] (EE) parse_vt_settings: Cannot open /dev/tty0 (Permission denied)
[    19.518] (EE)
[    19.518] (EE)
Please consult the The X.Org Foundation support

Debian is 9.4 stretch xrdp is running on a Rock64 board.

I have modified /etc/X11/Xwrapper.config as well, but no change:

# Xwrapper.config (Debian X Window System server wrapper configuration file)
#
# This file was generated by the post-installation script of the
# xserver-xorg-legacy package using values from the debconf database.
#
# See the Xwrapper.config(5) manual page for more information.
#
# This file is automatically updated on upgrades of the xserver-xorg-legacy
# package *only* if it has not been modified since the last upgrade of that
# package.
#
# If you have edited this file but would like it to be automatically updated
# again, run the following command as root:
#   dpkg-reconfigure xserver-xorg-legacy
allowed_users = anybody
needs_root_rights = no

Any pointer would be super appreciated. I can provide any extra information needed. Thanks a lot! I really love xrdp and it was working very well until now 😦

About this issue

Original URL
State: closed
Created 6 years ago
Comments: 22 (5 by maintainers)

Most upvoted comments

Fail! I forgot to install xorgxrdp!! 😢 At least on Ubuntu 18.04 I confirm it works out of the box by installing xrdp, xorgxrdp and doing “echo ‘mate-session’ ~/.xsession”

Thanks everyone! 😃

+24

solemgar on Jul 7, 2018

Installing xorgxrdp helped me too, I was able to log in with root. Thanks. Unfortunately normal user still not work. I also agree to open a different bug report now.

robertio on Jul 9, 2018

Trying xrdp on a new Linux Mint 19 install and the same problem:

[ 13149.834] (EE) parse_vt_settings: Cannot open /dev/tty0 (Permission denied)

and to make matters worse:

$ ps aux | grep xrdp
root     13384  0.0  0.0  42472   504 ?        S    12:00   0:00 /usr/sbin/xrdp-sesman
xrdp     13394  0.0  0.0  26100   520 ?        S    12:00   0:00 /usr/sbin/xrdp
bernd    13414  0.0  0.0  14428  1132 pts/2    S+   12:00   0:00 grep xrdp

it seems xrdp-sesman is running as root. But in case xrdp needs to open /dev/tty0:

$ ll /dev/tty0 crw–w---- 1 root tty 4, 0 Jul 4 11:52 /dev/tty0 $ sudo usermod -a -G tty xrdp $ groups xrdp xrdp : xrdp tty ~$ sudo chmod g+r /dev/tty0 $ ll /dev/tty0 crw-rw---- 1 root tty 4, 0 Jul 4 11:52 /dev/tty0


Alas, same error still in ~/.xorgxrdp.10.log:

`[ 14950.248] (EE) parse_vt_settings: Cannot open /dev/tty0 (Permission denied)`

Hmmm, why oh why?

I had rdp working on Linux Mint 18 without a hitch ...  oddities.

bernd-wechner on Jul 4, 2018

Take care of the server layout currently used:

[    19.458] (==) ServerLayout "X11 Server"

It’s much better to call it with a layout dedicated to xrdp and not trying to use actual hardware 😃

/etc/xrdp/sesman.ini

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
param=-layout
param=xrdp

The last two lines have to become mandatory. These days xorg includes crawler for config files having no stop directive 😉

/etc/X11/xrdp/xorg.conf

Section "ServerLayout"
    Identifier "xrdp"
    Screen "Screen (xrdpdev)"
    InputDevice "xrdpMouse" "CorePointer"
    InputDevice "xrdpKeyboard" "CoreKeyboard"
EndSection

smooker on Nov 22, 2020

Just installed the xrdp package from the repo on a ubuntu bionic image. Exactly the same error.

solemgar on Jun 28, 2018