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Configure SSH to use System Crypto Policy

An XCCDF Rule

Description

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.

Rationale

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

ID
xccdf_org.ssgproject.content_rule_configure_ssh_crypto_policy
Severity
Medium
References
Updated



Remediation - Shell Script


SSH_CONF="/etc/sysconfig/sshd"

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

Remediation - Ansible

- name: Configure SSH to use System Crypto Policy
  lineinfile:
    dest: /etc/sysconfig/sshd
    state: absent
    regexp: (?i)^\s*CRYPTO_POLICY.*$
  tags: