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Guide to the Secure Configuration of Red Hat Enterprise Linux 9

Rules, Groups, and Values defined within the XCCDF Benchmark

  • Support Only the Necessary Protocols

    Dovecot supports the IMAP and POP3 protocols, as well as SSL-protected versions of those protocols. Configure the Dovecot server to support only ...
    Group
    Show

  • Disable Cyrus IMAP

    If the system does not need to operate as an IMAP or POP3 server, the Cyrus IMAP software should be removed.
    Group
    Show

  • Uninstall cyrus-imapd Package

    The cyrus-imapd package can be removed with the following command: 
    $ sudo dnf erase cyrus-imapd
    Rule Unknown Severity
    Show

  • Disable Dovecot

    If the system does not need to operate as an IMAP or POP3 server, the dovecot software should be disabled and removed.
    Group
    Show

  • Uninstall dovecot Package

    The dovecot package can be removed with the following command: 
    $ sudo dnf erase dovecot
    Rule Unknown Severity
    Show

  • Disable Dovecot Service

    The dovecot service can be disabled with the following command: 
    $ sudo systemctl mask --now dovecot.service
    Rule Unknown Severity
    Show

  • Kerberos

    The Kerberos protocol is used for authentication across non-secure network. Authentication can happen between various types of principals -- users,...
    Group
    Show

  • Remove the Kerberos Server Package

    The <code>krb5-server</code> package should be removed if not in use. Is this system the Kerberos server? If not, remove the package. The <code>krb...
    Rule Medium Severity
    Show

  • Disable Kerberos by removing host keytab

    Kerberos is not an approved key distribution method for Common Criteria. To prevent using Kerberos by system daemons, remove the Kerberos keytab fi...
    Rule Medium Severity
    Show

  • LDAP

    LDAP is a popular directory service, that is, a standardized way of looking up information from a central database. Red Hat Enterprise Linux 9 incl...
    Group
    Show

  • Configure OpenLDAP Clients

    This section provides information on which security settings are important to configure in OpenLDAP clients by manually editing the appropriate con...
    Group
    Show

  • Ensure LDAP client is not installed

    The Lightweight Directory Access Protocol (LDAP) is a service that provides a method for looking up information from a central database. The <code>...
    Rule Low Severity
    Show

  • Configure OpenLDAP Server

    This section details some security-relevant settings for an OpenLDAP server.
    Group
    Show

  • Uninstall squid Package

    The squid package can be removed with the following command: 
     $ sudo dnf erase squid
    Rule Unknown Severity
    Show

  • Uninstall openldap-servers Package

    The openldap-servers package is not installed by default on a Red Hat Enterprise Linux 9 system. It is needed only by the OpenLDAP server, not by t...
    Rule Low Severity
    Show

  • Disable LDAP Server (slapd)

    The Lightweight Directory Access Protocol (LDAP) is a service that provides a method for looking up information from a central database.
    Rule Medium Severity
    Show

  • Install and Protect LDAP Certificate Files

    Create the PKI directory for LDAP certificates if it does not already exist: <pre>$ sudo mkdir /etc/pki/tls/ldap $ sudo chown root:root /etc/pki/tl...
    Group
    Show

  • Mail Server Software

    Mail servers are used to send and receive email over the network. Mail is a very common service, and Mail Transfer Agents (MTAs) are obvious target...
    Group
    Show

  • The Postfix package is installed

    A mail server is required for sending emails. The <code>postfix</code> package can be installed with the following command: <pre> $ sudo dnf instal...
    Rule Medium Severity
    Show

  • Uninstall Sendmail Package

    Sendmail is not the default mail transfer agent and is not installed by default. The <code>sendmail</code> package can be removed with the followin...
    Rule Medium Severity
    Show

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The content of the drawer really is up to you. It could have form fields, definition lists, text lists, labels, charts, progress bars, etc. Spacing recommendation is 24px margins. You can put tabs in here, and can also make the drawer scrollable.

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