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Special Forums IP Networking Force SSH session without/disabling X11 forwarding. Post 302969355 by vaibhavvsk on Tuesday 22nd of March 2016 02:44:46 AM
Old 03-22-2016
Question Force SSH session without/disabling X11 forwarding.

I would like to disable X11 session forcefully. I have tried the following things:

1. Setting appropriate DISPLAY variable in the /etc/environment file to be "0.0"
2. I have tried setting the sshd_config parameter X11Forwarding to be "no"

This session communication is happening by exchanging private file "id_rsa" so as to gain password-less communication between client and server.

What config changes would I be required to do on server and client side?
NOTE: Using Ubuntu 14.04 AMI's on AWS for the above case.
 

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STARTX(1)                                                     General Commands Manual                                                    STARTX(1)

NAME
startx - initialize an X session SYNOPSIS
startx [ [ client ] options ... ] [ -- [ server ] [ display ] options ... ] DESCRIPTION
The startx script is a front end to xinit(1) that provides a somewhat nicer user interface for running a single session of the X Window System. It is often run with no arguments. Arguments immediately following the startx command are used to start a client in the same manner as xinit(1). The special argument '--' marks the end of client arguments and the beginning of server options. It may be convenient to specify server options with startx to change on a per-session basis the default color depth, the server's notion of the number of dots-per-inch the display device presents, or take advantage of a different server layout, as permitted by the Xorg(1) server and specified in the xorg.conf(5) configuration. Some examples of specifying server arguments follow; consult the manual page for your X server to determine which arguments are legal. startx -- -depth 16 startx -- -dpi 100 startx -- -layout Multihead To determine the client to run, startx first looks for a file called .xinitrc in the user's home directory. If that is not found, it uses the file xinitrc in the xinit library directory. If command line client options are given, they override this behavior and revert to the xinit(1) behavior. To determine the server to run, startx first looks for a file called .xserverrc in the user's home directory. If that is not found, it uses the file xserverrc in the xinit library directory. If command line server options are given, they override this behavior and revert to the xinit(1) behavior. Users rarely need to provide a .xserverrc file. See the xinit(1) manual page for more details on the arguments. The system-wide xinitrc and xserverrc files are found in the /etc/X11/xinit directory. ENVIRONMENT VARIABLES
DISPLAY This variable gets set to the name of the display to which clients should connect. Note that this gets set, not read. XAUTHORITY This variable, if not already defined, gets set to $(HOME)/.Xauthority. This is to prevent the X server, if not given the -auth argument, from automatically setting up insecure host-based authentication for the local host. See the Xserver(1) and Xsecurity(7) manual pages for more information on X client/server authentication. FILES
$(HOME)/.xinitrc Client to run. Typically a shell script which runs many programs in the background. $(HOME)/.xserverrc Server to run. The default is X. /etc/X11/xinit/xinitrc Client to run if the user has no .xinitrc file. /etc/X11/xinit/xserverrc Server to run if the user has no .xserverrc file. SEE ALSO
xinit(1), X(7), Xserver(1), Xorg(1), xorg.conf(5) X Version 11 xinit 1.3.2 STARTX(1)
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