A separate file system must be used for user home directories (such as /home or an equivalent).

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-75587	UBTU-16-010910	SV-90267r2_rule		Medium

Description
The use of separate file systems for different paths can protect the system from failures resulting from a file system becoming full or failing.

STIG	Date
Canonical Ubuntu 16.04 Security Technical Implementation Guide	2020-05-29

Details

Check Text ( C-75291r2_chk )
Verify that a separate file system/partition has been created for non-privileged local interactive user home directories. Check the home directory assignment for all non-privileged users, users with a User Identifier (UID) greater than 1000, on the system with the following command: # awk -F: '($3>=1000)&&($1!="nobody"){print $1,$3,$6}' /etc/passwd adamsj 1001 /home/adamsj jacksonm 1002 /home/jacksonm smithj 1003 /home/smithj The output of the command will give the directory/partition that contains the home directories for the non-privileged users on the system (in this example, "/home") and users’ shell. All accounts with a valid shell (such as /bin/bash) are considered interactive users. Check that a file system/partition has been created for the non-privileged interactive users with the following command: Note: The partition of "/home" is used in the example. # grep /home /etc/fstab UUID=333ada18 /home ext4 noatime,nobarrier,nodev 1 2 If a separate entry for the file system/partition that contains the non-privileged interactive users' home directories does not exist, this is a finding.

Check Text ( C-75291r2_chk )

Verify that a separate file system/partition has been created for non-privileged local interactive user home directories.

Check the home directory assignment for all non-privileged users, users with a User Identifier (UID) greater than 1000, on the system with the following command:

# awk -F: '($3>=1000)&&($1!="nobody"){print $1,$3,$6}' /etc/passwd

adamsj 1001 /home/adamsj
jacksonm 1002 /home/jacksonm
smithj 1003 /home/smithj

The output of the command will give the directory/partition that contains the home directories for the non-privileged users on the system (in this example, "/home") and users’ shell. All accounts with a valid shell (such as /bin/bash) are considered interactive users.

Check that a file system/partition has been created for the non-privileged interactive users with the following command:

Note: The partition of "/home" is used in the example.

# grep /home /etc/fstab
UUID=333ada18 /home ext4 noatime,nobarrier,nodev 1 2

If a separate entry for the file system/partition that contains the non-privileged interactive users' home directories does not exist, this is a finding.

Fix Text (F-82215r1_fix)
Migrate the "/home" directory onto a separate file system/partition.