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Guide to the Secure Configuration of Red Hat Enterprise Linux 9

Rules, Groups, and Values defined within the XCCDF Benchmark

  • Configure Operating System to Protect Web Server

    The following configuration steps should be taken on the system which hosts the web server, in order to provide as safe an environment as possible ...
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  • Run httpd in a chroot Jail if Practical

    Running <code>httpd</code> inside a <code>chroot</code> jail is designed to isolate the web server process to a small section of the filesystem, li...
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  • Restrict File and Directory Access

    Minimize access to critical httpd files and directories.
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  • Set Permissions on All Configuration Files Inside /etc/httpd/conf.d/

    To properly set the permissions of /etc/http/conf.d/*, run the command: 
    $ sudo chmod 0640 /etc/http/conf.d/*
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  • Set Permissions on All Configuration Files Inside /etc/httpd/conf/

    To properly set the permissions of /etc/http/conf/*, run the command: 
    $ sudo chmod 0640 /etc/http/conf/*
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  • Set Permissions on All Configuration Files Inside /etc/httpd/conf.modules.d/

    To properly set the permissions of /etc/http/conf.modules.d/*, run the command: 
    $ sudo chmod 0640 /etc/http/conf.modules.d/*
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  • Configure PERL Securely

    PERL (Practical Extraction and Report Language) is an interpreted language optimized for scanning arbitrary text files, extracting information from...
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  • Enable SSL Support

    SSL should be used to encrypt network traffic between the Dovecot server and its clients. Users must authenticate to the Dovecot server in order ...
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  • Configure PHP Securely

    PHP is a widely-used and often misconfigured server-side scripting language. It should be used with caution, but configured appropriately when need...
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  • Directory Restrictions

    The Directory tags in the web server configuration file allow finer grained access control for a specified directory. All web directories should be...
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  • Minimize Web Server Loadable Modules

    A default installation of <code>httpd</code> includes a plethora of dynamically shared objects (DSO) that are loaded at run-time. Unlike the aforem...
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  • httpd Core Modules

    These modules comprise a basic subset of modules that are likely needed for base <code>httpd</code> functionality; ensure they are not commented ou...
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  • Minimize Modules for HTTP Basic Authentication

    The following modules are necessary if this web server will provide content that will be restricted by a password. <br><br> Authentication can be p...
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  • Minimize Configuration Files Included

    The <code>Include</code> directive directs <code>httpd</code> to load supplementary configuration files from a provided path. The default configura...
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  • 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 ...
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  • Disable Cyrus IMAP

    If the system does not need to operate as an IMAP or POP3 server, the Cyrus IMAP software should be removed.
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  • Minimize Various Optional Components

    The following modules perform very specific tasks, sometimes providing access to just a few additional directives. If such functionality is not req...
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  • Use Appropriate Modules to Improve httpd's Security

    Among the modules available for <code>httpd</code> are several whose use may improve the security of the web server installation. This section reco...
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  • Deploy mod_security

    The <code>security</code> module provides an application level firewall for <code>httpd</code>. Following its installation with the base ruleset, s...
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  • Deploy mod_ssl

    Because HTTP is a plain text protocol, all traffic is susceptible to passive monitoring. If there is a need for confidentiality, SSL should be conf...
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