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Rules and Groups employed by this XCCDF Profile
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Disable SSH Support for Rhosts RSA Authentication
SSH can allow authentication through the obsolete rsh command through the use of the authenticating user's SSH keys. This should be disabled. <br> <br> To ensure this behavior is disabled, ...Rule Medium Severity -
Disable SSH Root Login
The root user should never be allowed to login to a system directly over a network. To disable root login via SSH, add or correct the following line in <code>/etc/ssh/sshd_config</code>: <pre>Pe...Rule Medium Severity -
Disable SSH Support for User Known Hosts
SSH can allow system users to connect to systems if a cache of the remote systems public keys is available. This should be disabled. <br> <br> To ensure this behavior is disabled, add or c...Rule Medium Severity -
Disable X11 Forwarding
The X11Forwarding parameter provides the ability to tunnel X11 traffic through the connection to enable remote graphic connections. SSH has the capability to encrypt remote X11 connections when SSH...Rule Medium Severity -
Do Not Allow SSH Environment Options
Ensure that users are not able to override environment variables of the SSH daemon. <br> The default SSH configuration disables environment processing. The appropriate configuration is used if no v...Rule Medium Severity -
Enable Use of Strict Mode Checking
SSHs <code>StrictModes</code> option checks file and ownership permissions in the user's home directory <code>.ssh</code> folder before accepting login. If world- writable permissions are found, lo...Rule Medium Severity -
Enable SSH Warning Banner
To enable the warning banner and ensure it is consistent across the system, add or correct the following line in <code>/etc/ssh/sshd_config</code>: <pre>Banner /etc/issue</pre> Another section c...Rule Medium Severity -
Enable SSH Print Last Log
Ensure that SSH will display the date and time of the last successful account logon. <br> The default SSH configuration enables print of the date and time of the last login. The appropriate configu...Rule Medium Severity -
Use Only FIPS 140-2 Validated Ciphers
Limit the ciphers to those algorithms which are FIPS-approved. The following line in <code>/etc/ssh/sshd_config</code> demonstrates use of FIPS-approved ciphers: <pre>Ciphers aes256-ctr,aes192-ctr,...Rule Medium Severity -
Use Only FIPS 140-2 Validated Key Exchange Algorithms
Limit the key exchange algorithms to those which are FIPS-approved. Add or modify the following line in <code>/etc/ssh/sshd_config</code> <pre>KexAlgorithms ecdh-sha1-nistp256,ecdh-sha2-ni...Rule Medium Severity -
Use Only FIPS 140-2 Validated MACs
Limit the MACs to those hash algorithms which are FIPS-approved. The following line in <code>/etc/ssh/sshd_config</code> demonstrates use of FIPS-approved MACs: <pre>MACs hmac-sha2-512,hmac-sha2-25...Rule Medium Severity -
Enable Use of Privilege Separation
When enabled, SSH will create an unprivileged child process that has the privilege of the authenticated user. To enable privilege separation in SSH, add or correct the following line in the <code>/...Rule Medium Severity -
Prevent remote hosts from connecting to the proxy display
The SSH daemon should prevent remote hosts from connecting to the proxy display. <br> The default SSH configuration for <code>X11UseLocalhost</code> is <code>yes</code>, which prevents remote hosts...Rule Medium Severity -
System Security Services Daemon
The System Security Services Daemon (SSSD) is a system daemon that provides access to different identity and authentication providers such as Red Hat's IdM, Microsoft's AD, openLDAP, MIT Kerberos, ...Group -
Configure PAM in SSSD Services
SSSD should be configured to run SSSD <code>pam</code> services. To configure SSSD to known SSH hosts, add <code>pam</code> to <code>services</code> under the <code>[sssd]</code> section in <code>/...Rule Medium Severity -
System Security Services Daemon (SSSD) - LDAP
The System Security Services Daemon (SSSD) is a system daemon that provides access to different identity and authentication providers such as Red Hat's IdM, Microsoft's AD, openLDAP, MIT Kerberos, ...Group -
Configure SSSD LDAP Backend Client CA Certificate
Configure SSSD to implement cryptography to protect the integrity of LDAP remote access sessions. By setting the <pre>ldap_tls_cacert</pre> option in <pre>/etc/sssd/sssd.conf</pre> to point to the ...Rule Medium Severity -
Configure SSSD LDAP Backend Client CA Certificate Location
Configure SSSD to implement cryptography to protect the integrity of LDAP remote access sessions. By setting the <pre>ldap_tls_cacertdir</pre> option in <pre>/etc/sssd/sssd.conf</pre> to point to t...Rule Medium Severity -
Configure SSSD LDAP Backend Client to Demand a Valid Certificate from the Server
Configure SSSD to demand a valid certificate from the server to protect the integrity of LDAP remote access sessions by setting the <pre>ldap_tls_reqcert</pre> option in <pre>/etc/sssd/sssd.conf</p...Rule Medium Severity -
Configure SSSD LDAP Backend to Use TLS For All Transactions
The LDAP client should be configured to implement TLS for the integrity of all remote LDAP authentication sessions. If the <code>id_provider</code> is set to <code>ldap</code> or <code>ipa</code> i...Rule High Severity
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