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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
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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
    Copy to Clipboard Toggle word wrap

  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'
    Copy to Clipboard Toggle word wrap

  3. Rerun the satellite-installer tool with no arguments: 

    # satellite-installer --scenario satellite
    Copy to Clipboard Toggle word wrap

  4. Restart Katello services: 

    # katello-service restart
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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
    Copy to Clipboard Toggle word wrap

  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"
    Copy to Clipboard Toggle word wrap

  3. Rerun the satellite-installer tool with no arguments: 

    # satellite-installer --scenario capsule
    Copy to Clipboard Toggle word wrap

  4. Restart Katello services: 

    # katello-service restart
    Copy to Clipboard Toggle word wrap

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
    Copy to Clipboard Toggle word wrap

  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
    Copy to Clipboard Toggle word wrap

  3. Restart the httpd service: 

    # systemctl restart httpd
    Copy to Clipboard Toggle word wrap

  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
    Copy to Clipboard Toggle word wrap

  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
    Copy to Clipboard Toggle word wrap

  6. Run the satellite-installer tool to add the changes to the Apache configuration: 

    # satellite-installer -S satellite
    Copy to Clipboard Toggle word wrap
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