RHEL 8 must ensure session control is automatically started at shell initialization.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-230349	RHEL-08-020041	SV-230349r599732_rule		Medium

Description
A session lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not want to log out because of the temporary nature of the absence. The session lock is implemented at the point where session activity can be determined. Rather than be forced to wait for a period of time to expire before the user session can be locked, RHEL 8 needs to provide users with the ability to manually invoke a session lock so users can secure their session if it is necessary to temporarily vacate the immediate physical vicinity. Tmux is a terminal multiplexer that enables a number of terminals to be created, accessed, and controlled from a single screen. Red Hat endorses tmux as the recommended session controlling package. Satisfies: SRG-OS-000028-GPOS-00009, SRG-OS-000030-GPOS-00011

Description

A session lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not want to log out because of the temporary nature of the absence. The session lock is implemented at the point where session activity can be determined. Rather than be forced to wait for a period of time to expire before the user session can be locked, RHEL 8 needs to provide users with the ability to manually invoke a session lock so users can secure their session if it is necessary to temporarily vacate the immediate physical vicinity. Tmux is a terminal multiplexer that enables a number of terminals to be created, accessed, and controlled from a single screen. Red Hat endorses tmux as the recommended session controlling package. Satisfies: SRG-OS-000028-GPOS-00009, SRG-OS-000030-GPOS-00011

STIG	Date
Red Hat Enterprise Linux 8 Security Technical Implementation Guide	2020-11-25

Details

Check Text ( C-33018r567793_chk )
Verify the operating system shell initialization file is configured to start each shell with the tmux terminal multiplexer with the following command: $ sudo grep -i tmux /etc/bashrc [ -n "$PS1" -a -z "$TMUX" ] && exec tmux If "tmux" is not configured as the example above, is commented out, or missing from the "/etc/bashrc" initialization file, this is a finding.

Fix Text (F-32993r567794_fix)
Configure the operating system to initialize the tmux terminal multiplexer as each shell is called by adding the following line to the end of the "/etc/bashrc" configuration file: [ -n "$PS1" -a -z "$TMUX" ] && exec tmux This setting will take effect at next logon.