Guide to the Secure Configuration of Red Hat Enterprise Linux 8
Rules, Groups, and Values defined within the XCCDF Benchmark
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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 ...Group -
Configure Dovecot to Use the SSL Certificate file
This option tells Dovecot where to find the mail server's SSL Certificate. <br><br> Edit <code>/etc/dovecot/conf.d/10-ssl.conf</code> and add or co...Rule Unknown Severity -
Configure Dovecot to Use the SSL Key file
This option tells Dovecot where to find the mail server's SSL Key. <br><br> Edit <code>/etc/dovecot/conf.d/10-ssl.conf</code> and add or correct th...Rule Unknown Severity -
Disable Plaintext Authentication
To prevent Dovecot from attempting plaintext authentication of clients, edit <code>/etc/dovecot/conf.d/10-auth.conf</code> and add\or correct the f...Rule Unknown Severity -
Enable the SSL flag in /etc/dovecot.conf
To allow clients to make encrypted connections the <code>ssl</code> flag in Dovecot's configuration file needs to be set to <code>yes</code>. <br><...Rule Unknown Severity -
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 -
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 -
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 -
LDAP
LDAP is a popular directory service, that is, a standardized way of looking up information from a central database. Red Hat Enterprise Linux 8 incl...Group -
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 -
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 -
Enable the LDAP Client For Use in Authconfig
To determine if LDAP is being used for authentication, use the following command: <pre>$ sudo grep -i useldapauth /etc/sysconfig/authconfig</pre> <...Rule Medium Severity -
Configure LDAP Client to Use TLS For All Transactions
This check verifies cryptography has been implemented to protect the integrity of remote LDAP authentication sessions. <br><br> To determine if LDA...Rule Medium Severity -
Configure Certificate Directives for LDAP Use of TLS
Ensure a copy of a trusted CA certificate has been placed in the file <code>/etc/pki/tls/CA/cacert.pem</code>. Configure LDAP to enforce TLS use an...Rule Medium Severity -
Configure OpenLDAP Server
This section details some security-relevant settings for an OpenLDAP server.Group -
Uninstall openldap-servers Package
The openldap-servers package is not installed by default on a Red Hat Enterprise Linux 8 system. It is needed only by the OpenLDAP server, not by t...Rule Low Severity -
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 -
Disable Secure RPC Client Service (rpcgssd)
The rpcgssd service manages RPCSEC GSS contexts required to secure protocols that use RPC (most often Kerberos and NFS). The rpcgssd service is the...Rule Unknown Severity -
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 -
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
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