Configure SSH to use System Crypto Policy


Crypto Policies provide a centralized control over crypto algorithms usage of many packages. SSH is supported by crypto policy, but the SSH configuration may be set up to ignore it. To check that Crypto Policies settings are configured correctly, ensure that the CRYPTO_POLICY variable is either commented or not set at all in the /etc/sysconfig/sshd.


Overriding the system crypto policy makes the behavior of the SSH service violate expectations, and makes system configuration more fragmented.


Shell script

The following script can be run on the host to remediate the issue.



sed -i "/^\s*CRYPTO_POLICY.*$/Id" $SSH_CONF

Ansible playbook

The following playbook can be run with Ansible to remediate the issue.

- name: Configure SSH to use System Crypto Policy
    dest: /etc/sysconfig/sshd
    state: absent
    regexp: ^(?i)\s*CRYPTO_POLICY.*$
  - CCE-80939-2
  - DISA-STIG-RHEL-08-010287
  - NIST-800-53-AC-17(2)
  - NIST-800-53-AC-17(a)
  - NIST-800-53-CM-6(a)
  - NIST-800-53-MA-4(6)
  - NIST-800-53-SC-13
  - PCI-DSS-Req-2.2
  - PCI-DSSv4-2.2.7
  - configure_ssh_crypto_policy
  - disable_strategy
  - low_complexity
  - medium_disruption
  - medium_severity
  - reboot_required