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Guide to the Secure Configuration of Red Hat Enterprise Linux 7

Rules, Groups, and Values defined within the XCCDF Benchmark

  • Postfix Network Interfaces

    The setting for inet_interfaces in /etc/postfix/main.cf
    Value
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  • Postfix relayhost

    Specify the host all outbound email should be routed into.
    Value
    Show

  • Postfix Root Mail Alias

    Specify an email address (string) for a root mail alias.
    Value
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  • Configure System to Forward All Mail For The Root Account

    Make sure that mails delivered to root user are forwarded to a monitored email address. Make sure that the address <xccdf-1.2:sub idref="xccdf_org....
    Rule Medium Severity
    Show

  • Configure System to Forward All Mail From Postmaster to The Root Account

    Verify the administrators are notified in the event of an audit processing failure. Check that the "/etc/aliases" file has a defined value for "roo...
    Rule Medium Severity
    Show

  • Configure System to Forward All Mail through a specific host

    Set up a relay host that will act as a gateway for all outbound email. Edit the file <code>/etc/postfix/main.cf</code> to ensure that only the foll...
    Rule Medium Severity
    Show

  • Disable Postfix Network Listening

    Edit the file <code>/etc/postfix/main.cf</code> to ensure that only the following <code>inet_interfaces</code> line appears: <pre>inet_interfaces =...
    Rule Medium Severity
    Show

  • Configure Operating System to Protect Mail Server

    The guidance in this section is appropriate for any host which is operating as a site MTA, whether the mail server runs using Sendmail, Postfix, or...
    Group
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  • Configure SSL Certificates for Use with SMTP AUTH

    If SMTP AUTH is to be used, the use of SSL to protect credentials in transit is strongly recommended. There are also configurations for which it ma...
    Group
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  • Ensure Security of Postfix SSL Certificate

    Create the PKI directory for mail certificates, if it does not already exist: <pre>$ sudo mkdir /etc/pki/tls/mail $ sudo chown root:root /etc/pki/t...
    Group
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  • Configure Postfix if Necessary

    Postfix stores its configuration files in the directory /etc/postfix by default. The primary configuration file is /etc/postfix/main.cf.
    Group
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  • Configure SMTP Greeting Banner

    Edit <code>/etc/postfix/main.cf</code>, and add or correct the following line, substituting some other wording for the banner information if you pr...
    Rule Low Severity
    Show

  • Configure Postfix Resource Usage to Limit Denial of Service Attacks

    Edit <code>/etc/postfix/main.cf</code>. Edit the following lines to configure the amount of system resources Postfix can consume: <pre>default_proc...
    Group
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  • Control Mail Relaying

    Postfix's mail relay controls are implemented with the help of the smtpd recipient restrictions option, which controls the restrictions placed on t...
    Group
    Show

  • Prevent Unrestricted Mail Relaying

    Modify the <pre>/etc/postfix/main.cf</pre> file to restrict client connections to the local network with the following command: <pre>$ sudo postcon...
    Rule Medium Severity
    Show

  • Enact SMTP Recipient Restrictions

    To configure Postfix to restrict addresses to which it will send mail, see: <a href="http://www.postfix.org/SMTPD_ACCESS_README.html#danger">h...
    Group
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  • Enact SMTP Relay Restrictions

    To configure Postfix to restrict addresses to which it will send mail, see: <a href="http://www.postfix.org/SMTPD_ACCESS_README.html#danger">h...
    Group
    Show

  • Use TLS for SMTP AUTH

    Postfix provides options to use TLS for certificate-based authentication and encrypted sessions. An encrypted session protects the information that...
    Group
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  • Configure Trusted Networks and Hosts

    Edit <code>/etc/postfix/main.cf</code>, and configure the contents of the <code>mynetworks</code> variable in one of the following ways: <ul> <li>I...
    Group
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  • Require SMTP AUTH Before Relaying from Untrusted Clients

    SMTP authentication allows remote clients to relay mail safely by requiring them to authenticate before submitting mail. Postfix's SMTP AUTH uses a...
    Group
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