AIX must automatically lock after 15 minutes of inactivity in the CDE Graphical desktop environment.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-215318	AIX7-00-003000	SV-215318r508663_rule		Medium

Description
A session time-out 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 log out because of the temporary nature of the absence. Rather than relying on the user to manually lock their operating system session prior to vacating the vicinity, operating systems need to be able to identify when a user's session has idled and take action to initiate the session lock. The session lock is implemented at the point where session activity can be determined and/or controlled.

Description

A session time-out 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 log out because of the temporary nature of the absence. Rather than relying on the user to manually lock their operating system session prior to vacating the vicinity, operating systems need to be able to identify when a user's session has idled and take action to initiate the session lock. The session lock is implemented at the point where session activity can be determined and/or controlled.

STIG	Date
IBM AIX 7.x Security Technical Implementation Guide	2022-06-06

Details

Check Text ( C-16516r294405_chk )
If CDE (X11) is not used on AIX, this is Not Applicable. From the command prompt, run the following script: for file in /usr/dt/config//sys.resources; do etc_file=`echo $file \| sed -e s/usr/etc/` echo "\nChecking config file "$etc_file"..." if [[ ! -f $etc_file ]]; then echo "Missing config file "$etc_file else cat $etc_file \|grep 'dtsession\saverTimeout:' cat $etc_file \|grep 'dtsession\lockTimeout:' fi done The above script should yield the following output: Checking config file /etc/dt/config/C/sys.resources... Missing config file /etc/dt/config/C/sys.resources Checking config file /etc/dt/config/POSIX/sys.resources... dtsessionsaverTimeout: 15 dtsessionlockTimeout: 30 Checking config file /etc/dt/config/en_US/sys.resources... dtsessionsaverTimeout: 15 dtsessionlockTimeout: 25 If the result of the script shows any config file missing, or any of the "dtsessionsaverTimeout" or "dtsession*lockTimeout" values are greater than "15", this is a finding.

Check Text ( C-16516r294405_chk )

If CDE (X11) is not used on AIX, this is Not Applicable.

From the command prompt, run the following script:
for file in /usr/dt/config/*/sys.resources; do
etc_file=`echo $file | sed -e s/usr/etc/`
echo "\nChecking config file "$etc_file"..."
if [[ ! -f $etc_file ]]; then
echo "Missing config file "$etc_file
else
cat $etc_file |grep 'dtsession\*saverTimeout:'
cat $etc_file |grep 'dtsession\*lockTimeout:'
fi
done

The above script should yield the following output:
Checking config file /etc/dt/config/C/sys.resources...
Missing config file /etc/dt/config/C/sys.resources

Checking config file /etc/dt/config/POSIX/sys.resources...
dtsession*saverTimeout: 15
dtsession*lockTimeout: 30

Checking config file /etc/dt/config/en_US/sys.resources...
dtsession*saverTimeout: 15
dtsession*lockTimeout: 25

If the result of the script shows any config file missing, or any of the "dtsession*saverTimeout" or "dtsession*lockTimeout" values are greater than "15", this is a finding.

Fix Text (F-16514r294406_fix)
From the command prompt, run the following script to set the default timeout parameters "dtsessionsaverTimeout:" and "dtsessionlockTimeout:" as "15" minutes: for file in /usr/dt/config//sys.resources; do etc_file=`echo $file \| sed -e s/usr/etc/` echo "\nupdating config file "$etc_file"..." if [[ ! -f $etc_file ]]; then dir=`dirname $file \| sed -e s/usr/etc/` mkdir -p $dir echo 'dtsessionsaverTimeout: 15' >> $dir/sys.resources echo 'dtsessionlockTimeout: 15' >> $dir/sys.resources else cp $etc_file $etc_file.bak cat $etc_file \| grep -v 'dtsession\saverTimeout:' > $etc_file.sav cat $etc_file.sav \| grep -v 'dtsession\lockTimeout:' > $etc_file echo 'dtsessionsaverTimeout: 15' >> $etc_file echo 'dtsession*lockTimeout: 15' >> $etc_file fi done

Fix Text (F-16514r294406_fix)

From the command prompt, run the following script to set the default timeout parameters "dtsession*saverTimeout:" and "dtsession*lockTimeout:" as "15" minutes:
for file in /usr/dt/config/*/sys.resources; do
etc_file=`echo $file | sed -e s/usr/etc/`
echo "\nupdating config file "$etc_file"..."
if [[ ! -f $etc_file ]]; then
dir=`dirname $file | sed -e s/usr/etc/`
mkdir -p $dir
echo 'dtsession*saverTimeout: 15' >> $dir/sys.resources
echo 'dtsession*lockTimeout: 15' >> $dir/sys.resources
else
cp $etc_file $etc_file.bak
cat $etc_file | grep -v 'dtsession\*saverTimeout:' > $etc_file.sav
cat $etc_file.sav | grep -v 'dtsession\*lockTimeout:' > $etc_file
echo 'dtsession*saverTimeout: 15' >> $etc_file
echo 'dtsession*lockTimeout: 15' >> $etc_file
fi
done