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Guide to the Secure Configuration of Red Hat Enterprise Linux 9

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  • Install firewalld Package

    The firewalld package can be installed with the following command: 
    $ sudo dnf install firewalld
    Rule Medium Severity
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  • Strengthen the Default Ruleset

    The default rules can be strengthened. The system scripts that activate the firewall rules expect them to be defined in configuration files under t...
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  • Configure the Firewalld Ports

    Configure the <code>firewalld</code> ports to allow approved services to have access to the system. To configure <code>firewalld</code> to open por...
    Rule Medium Severity
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  • Firewalld Must Employ a Deny-all, Allow-by-exception Policy for Allowing Connections to Other Systems

    Red Hat Enterprise Linux 9 incorporates the "firewalld" daemon, which allows for many different configurations. One of these configurations is zone...
    Rule Medium Severity
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  • Configure Firewalld to Restrict Loopback Traffic

    Configure <code>firewalld</code> to restrict loopback traffic to the <code>lo</code> interface. The loopback traffic must be trusted by assigning ...
    Rule Medium Severity
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  • Configure Firewalld to Trust Loopback Traffic

    Assign loopback interface to the <code>firewalld</code> <code>trusted</code> zone in order to explicitly allow the loopback traffic in the system. ...
    Rule Medium Severity
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  • Set Default firewalld Zone for Incoming Packets

    To set the default zone to <code>drop</code> for the built-in default zone which processes incoming IPv4 and IPv6 packets, modify the following lin...
    Rule Medium Severity
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  • IPSec Support

    Support for Internet Protocol Security (IPsec) is provided with Libreswan.
    Group
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  • Install libreswan Package

    The libreswan package provides an implementation of IPsec and IKE, which permits the creation of secure tunnels over untrusted networks. The <code>...
    Rule Medium Severity
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  • net.ipv4.conf.default.rp_filter

    Enables source route verification
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