Verify Group Ownership on SSH Server Private *_key Key Files
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Description
SSH server private keys, files that match the /etc/ssh/*_key glob, must be
group-owned by ssh_keys group.
Rationale
If an unauthorized user obtains the private SSH host key file, the host could be impersonated.
Shell script
The following script can be run on the host to remediate the issue.
#!/bin/bash
# Remediation is applicable only in certain platforms
if [ ! -f /.dockerenv ] && [ ! -f /run/.containerenv ]; then
find /etc/ssh/ -maxdepth 1 -type f ! -group ssh_keys -regex '^.*_key$' -exec chgrp ssh_keys {} \;
else
>&2 echo 'Remediation is not applicable, nothing was done'
fi
Ansible playbook
The following playbook can be run with Ansible to remediate the issue.
- name: Find /etc/ssh/ file(s) matching ^.*_key$
command: find -H /etc/ssh/ -maxdepth 1 -type f ! -group ssh_keys -regex "^.*_key$"
register: files_found
changed_when: false
failed_when: false
check_mode: false
when: ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
tags:
- CCE-86125-2
- configure_strategy
- file_groupownership_sshd_private_key
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- name: Ensure group owner on /etc/ssh/ file(s) matching ^.*_key$
file:
path: '{{ item }}'
group: ssh_keys
state: file
with_items:
- '{{ files_found.stdout_lines }}'
when: ansible_virtualization_type not in ["docker", "lxc", "openvz", "podman", "container"]
tags:
- CCE-86125-2
- configure_strategy
- file_groupownership_sshd_private_key
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
