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The SSH utility (when invoked with option -X or option ForwardX11) tunnels X11 traffic from remotely invoked clients to the local server. It does so by setting at the remote site the DISPLAY environment variable to point to a local TCP socket opened there by sshd, which then tunnels the X11 communication back to ssh.
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On Unix-like systems, the list of authorized public keys is typically stored in the home directory of the user that is allowed to log in remotely, in the file ~/.ssh/authorized_keys. [4] This file is respected by SSH only if it is not writable by anything apart from the owner and root.
The virtual consoles can be configured in the file /etc/inittab read by init—typically it starts the text mode login process getty for several virtual consoles. X Window System can be configured in /etc/inittab or by an X display manager. A number of Linux distributions use systemd instead of init, which also allows virtual console configuration.
The SSH developers have stated that the major impact of the attack is the capability to degrade the keystroke timing obfuscation features of SSH. [6] The designers of SSH have implemented a fix for the Terrapin attack, but the fix is only fully effective when both client and server implementations have been upgraded to support it. [1]
use ssh -X command to connect to the remote machine; request a local display/input service (e.g., export DISPLAY=[user's machine]:0 if not using SSH with X forwarding enabled) The remote X client application will then make a connection to the user's local X server, providing display and input to the user.
chattr — Change file attributes on a Linux file system. chgrp — Change group of one or more files. chmod — Change mode of listed files. chown — Change owner of one or more files. chroot — Run command within a new root directory. chrt — Get/set a process' real-time scheduling policy and priority. chsh — Change your login shell.
In Unix-like computer OSes (such as Linux), root is the conventional name of the user who has all rights or permissions (to all files and programs) in all modes (single- or multi-user). Alternative names include baron in BeOS and avatar on some Unix variants. [2] BSD often provides a toor ("root" written backward) account in addition to a root ...