Chapter 7. Disabling Weak Encryption

You might want to change the encryption settings for Satellite depending on the security requirements of your infrastructure or to fix vulnerabilities quickly. Use the following sections to disable weak SSL encryption and 64-bit cipher suites.

7.1. Disabling Weak SSL 2.0 and SSL 3.0 Encryption

If your Satellite fails Nessus scans because of SSL vulnerabilities, or your security infrastructure requires that you disable SSL 2.0 and SSL 3.0, you can edit the /etc/foreman-installer/custom-hiera.yaml file to remove weak encryption.

Disabling Weak SSL 2.0 and SSL 3.0 Encryption for Satellite

To disable weak encryption for Satellite, complete the following steps:

  1. Open the /etc/foreman-installer/custom-hiera.yaml file for editing:

    # vi /etc/foreman-installer/custom-hiera.yaml
  2. Add the following entries:

    # Foreman Proxy
    foreman_proxy::tls_disabled_versions: [ '1.1' ]
    
    # Dynflow
    foreman_proxy::plugin::dynflow::tls_disabled_versions: [ '1.1' ]
    
    # Apache
    apache::mod::ssl::ssl_protocol: [ 'ALL' , '-SSLv3' , '-TLSv1' , '-TLSv1.1' , '+TLSv1.2' ]
    
    # Tomcat / Candlepin
    candlepin::tls_versions: [ '1.2' ]
    
    # QPID Dispatch
    foreman_proxy_content::qpid_router_ssl_protocols: [ 'TLSv1.2' ]
    foreman_proxy_content::qpid_router_ssl_ciphers: 'ALL:!aNULL:+HIGH:-SSLv3:!IDEA-CBC-SHA'
  3. Rerun the satellite-installer tool with no arguments:

    # satellite-installer
  4. Restart the satellite-maintain services:

    # satellite-maintain service restart

Disabling Weak SSL 2.0 and SSL 3.0 Encryption for Capsule

To disable weak encryption for Capsule, complete the following steps:

  1. Open the /etc/foreman-installer/custom-hiera.yaml file for editing:

    # vi /etc/foreman-installer/custom-hiera.yaml
  2. Add the following entries:

    # Foreman Proxy
    foreman_proxy::tls_disabled_versions: [ '1.1' ]
    
    # Dynflow
    foreman_proxy::plugin::dynflow::tls_disabled_versions: [ '1.1' ]
    
    # Apache
    apache::mod::ssl::ssl_protocol: [ 'ALL' , '-SSLv3' , '-TLSv1' , '-TLSv1.1' , '+TLSv1.2' ]
    
    # QPID Dispatch
    foreman_proxy_content::qpid_router_ssl_protocols: [ 'TLSv1.2' ]
    foreman_proxy_content::qpid_router_ssl_ciphers: 'ALL:!aNULL:+HIGH:-SSLv3:!IDEA-CBC-SHA'
    
    # PULP
    pulp::ssl_protocol: "ALL -SSLv3 -TLSv1 -TLSv1.1 +TLSv1.2"
  3. Rerun the satellite-installer tool with no arguments:

    # satellite-installer
  4. Restart the satellite-maintain services:

    # satellite-maintain service restart

7.2. Disabling 64-bit Block Size Cipher Suites (SWEET32)

If you want to update your cipher suites for Satellite, you can edit the ciphers and then add your changes to the /etc/foreman-installer/custom-hiera.yaml file to make these changes persistent.

You can use the following procedure to update your cipher suite.

Until BZ#1586271 is resolved, you might want to disable SSL 64-bit Block Size Cipher Suites (SWEET32). However, you can also use this procedure to update other ciphers and make these changes persistent.

The minimum browser requirements for the following Ciphers is Firefox 27.

  1. Open the /etc/httpd/conf.d/ssl.conf Apache configuration file for editing:

    # vi /etc/httpd/conf.d/ssl.conf
  2. Update the values of SSLCipherSuite parameter:

    SSLCipherSuite ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256
  3. Restart the httpd service:

    # systemctl restart httpd
  4. To make the change persistent across different satellite-installer executions, open the /etc/foreman-installer/custom-hiera.yaml file for editing:

    # vi /etc/foreman-installer/custom-hiera.yaml
  5. Add the following entry for apache:

    apache::mod::ssl::ssl_cipher: ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-SHA384:ECDHE-RSA-AES256-SHA384:ECDHE-ECDSA-AES128-SHA256:ECDHE-RSA-AES128-SHA256
  6. Run the satellite-installer tool to add the changes to the Apache configuration:

    # satellite-installer -S satellite