Guide to the Secure Configuration of Red Hat Enterprise Linux 9
Rules, Groups, and Values defined within the XCCDF Benchmark
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Protect Physical Console Access
It is impossible to fully protect a system from an attacker with physical access, so securing the space in which the system is located should be co...Group -
Login timeout for idle sessions
Specify duration of allowed idle time.Value -
Disable debug-shell SystemD Service
SystemD's <code>debug-shell</code> service is intended to diagnose SystemD related boot issues with various <code>systemctl</code> commands. Once e...Rule Medium Severity -
Disable Ctrl-Alt-Del Burst Action
By default, <code>SystemD</code> will reboot the system if the <code>Ctrl-Alt-Del</code> key sequence is pressed Ctrl-Alt-Delete more than 7 times ...Rule High Severity -
condor_tcp_network_connect SELinux Boolean
default - Default SELinux boolean setting.
on - SELinux boolean is enabled.
off - SELinux boolean is disabled.Value -
Disable Ctrl-Alt-Del Reboot Activation
By default, <code>SystemD</code> will reboot the system if the <code>Ctrl-Alt-Del</code> key sequence is pressed. <br><br> To configure the system ...Rule High Severity -
Verify that Interactive Boot is Disabled
Red Hat Enterprise Linux 9 systems support an "interactive boot" option that can be used to prevent services from being started. On a Red Hat Enter...Rule Medium Severity -
Configure Logind to terminate idle sessions after certain time of inactivity
To configure <code>logind</code> service to terminate inactive user sessions after <xccdf-1.2:sub idref="xccdf_org.ssgproject.content_value_var_log...Rule Medium Severity -
Require Authentication for Emergency Systemd Target
Emergency mode is intended as a system recovery method, providing a single user root access to the system during a failed boot sequence. <br><br> B...Rule Medium Severity -
Require Authentication for Single User Mode
Single-user mode is intended as a system recovery method, providing a single user root access to the system by providing a boot option at startup. ...Rule Medium Severity -
Configure Screen Locking
When a user must temporarily leave an account logged-in, screen locking should be employed to prevent passersby from abusing the account. User educ...Group -
Configure Console Screen Locking
A console screen locking mechanism is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the in...Group -
Install the tmux Package
To enable console screen locking, install the <code>tmux</code> package. A session lock is a temporary action taken when a user stops work and move...Rule Medium Severity -
Ensure rsyslog Default File Permissions Configured
rsyslog will create logfiles that do not already exist on the system. This settings controls what permissions will be applied to these newly create...Rule Medium Severity -
Support session locking with tmux
The <code>tmux</code> terminal multiplexer is used to implement automatic session locking. It should be started from <code>/etc/bashrc</code> or dr...Rule Medium Severity -
Configure tmux to lock session after inactivity
To enable console screen locking in <code>tmux</code> terminal multiplexer after a period of inactivity, the <code>lock-after-time</code> option ha...Rule Medium Severity -
Configure the tmux Lock Command
To enable console screen locking in <code>tmux</code> terminal multiplexer, the <code>vlock</code> command must be configured to be used as a locki...Rule Medium Severity -
Prevent user from disabling the screen lock
Thetmuxterminal multiplexer is used to implement automatic session locking. It should not be listed in/etc/shells.Rule Low Severity -
Hardware Tokens for Authentication
The use of hardware tokens such as smart cards for system login provides stronger, two-factor authentication than using a username and password. I...Group -
OpenSC Smart Card Drivers
Choose the Smart Card Driver in use by your organization. <br>For DoD, choose the <code>cac</code> driver. <br>If your driver is not listed and you...Value -
Install the opensc Package For Multifactor Authentication
Theopenscpackage can be installed with the following command:$ sudo dnf install opensc
Rule Medium Severity -
Install the pcsc-lite package
Thepcsc-litepackage can be installed with the following command:$ sudo dnf install pcsc-lite
Rule Medium Severity -
Install Smart Card Packages For Multifactor Authentication
Configure the operating system to implement multifactor authentication by installing the required package with the following command: The <code>op...Rule Medium Severity -
Enable the pcscd Service
Thepcscdservice can be enabled with the following command:$ sudo systemctl enable pcscd.service
Rule Medium Severity -
Verify Proper Storage and Existence of Password Hashes
By default, password hashes for local accounts are stored in the second field (colon-separated) in <code>/etc/shadow</code>. This file should be re...Group -
Configure opensc Smart Card Drivers
The OpenSC smart card tool can auto-detect smart card drivers; however, setting the smart card drivers in use by your organization helps to prevent...Rule Medium Severity -
Force opensc To Use Defined Smart Card Driver
The OpenSC smart card middleware can auto-detect smart card drivers; however by forcing the smart card driver in use by your organization, opensc w...Rule Medium Severity -
Protect Accounts by Restricting Password-Based Login
Conventionally, Unix shell accounts are accessed by providing a username and password to a login program, which tests these values for correctness ...Group -
Accounts Authorized Local Users on the Operating System
List the user accounts that are authorized locally on the operating system. This list includes both users requried by the operating system and by t...Value -
Ensure All Accounts on the System Have Unique User IDs
Change user IDs (UIDs), or delete accounts, so each has a unique name.Rule Medium Severity -
Only Authorized Local User Accounts Exist on Operating System
Enterprise Application tends to use the server or virtual machine exclusively. Besides the default operating system user, there should be only auth...Rule Medium Severity -
Ensure All Groups on the System Have Unique Group ID
Change the group name or delete groups, so each has a unique id.Rule Medium Severity -
Set Account Expiration Parameters
Accounts can be configured to be automatically disabled after a certain time period, meaning that they will require administrator interaction to be...Group -
Password Hashing algorithm
Specify the number of SHA rounds for the system password encryption algorithm. Defines the value set in <code>/etc/pam.d/system-auth</code> and <co...Value -
Set Account Expiration Following Inactivity
To specify the number of days after a password expires (which signifies inactivity) until an account is permanently disabled, add or correct the fo...Rule Medium Severity -
Assign Expiration Date to Emergency Accounts
Emergency accounts are privileged accounts established in response to crisis situations where the need for rapid account activation is required. In...Rule Medium Severity -
Assign Expiration Date to Temporary Accounts
Temporary accounts are established as part of normal account activation procedures when there is a need for short-term accounts. In the event tempo...Rule Medium Severity -
Ensure All Accounts on the System Have Unique Names
Ensure accounts on the system have unique names. To ensure all accounts have unique names, run the following command: <pre>$ sudo getent passwd | ...Rule Medium Severity -
Use Centralized and Automated Authentication
Implement an automated system for managing user accounts that minimizes the risk of errors, either intentional or deliberate. This system should in...Rule Medium Severity -
Set Password Expiration Parameters
The file <code>/etc/login.defs</code> controls several password-related settings. Programs such as <code>passwd</code>, <code>su</code>, and <code>...Group -
maximum password age
Maximum age of password in daysValue -
minimum password age
Minimum age of password in daysValue -
minimum password length
Minimum number of characters in passwordValue -
Set Password Maximum Age
To specify password maximum age for new accounts, edit the file <code>/etc/login.defs</code> and add or correct the following line: <pre>PASS_MAX_D...Rule Medium Severity -
Set Password Minimum Age
To specify password minimum age for new accounts, edit the file <code>/etc/login.defs</code> and add or correct the following line: <pre>PASS_MIN_D...Rule Medium Severity -
Set Password Minimum Length in login.defs
To specify password length requirements for new accounts, edit the file <code>/etc/login.defs</code> and add or correct the following line: <pre>PA...Rule Medium Severity -
Set Existing Passwords Maximum Age
Configure non-compliant accounts to enforce a <xccdf-1.2:sub idref="xccdf_org.ssgproject.content_value_var_accounts_maximum_age_login_defs" use="le...Rule Medium Severity -
Set Existing Passwords Minimum Age
Configure non-compliant accounts to enforce a 24 hours/1 day minimum password lifetime by running the following command: <pre>$ sudo chage -m 1 <i>...Rule Medium Severity -
Set Existing Passwords Warning Age
To configure how many days prior to password expiration that a warning will be issued to users, run the command: <pre>$ sudo chage --warndays <xccd...Rule Medium Severity -
Set Password Warning Age
To specify how many days prior to password expiration that a warning will be issued to users, edit the file <code>/etc/login.defs</code> and add or...Rule Medium Severity
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