Verify Owner on SSH Server config file
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언제든지 연락주시기 바랍니다.Description
To properly set the owner of /etc/ssh/sshd_config
, run the command:
$ sudo chown root /etc/ssh/sshd_config
Rationale
Service configuration files enable or disable features of their respective
services that if configured incorrectly can lead to insecure and vulnerable
configurations. Therefore, service configuration files should be owned by the
correct group to prevent unauthorized changes.
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 dpkg-query --show --showformat='${db:Status-Status}' 'linux-base' 2>/dev/null | grep -q '^installed$'; then
if id "0" >/dev/null 2>&1; then
newown="0"
fi
if [[ -z ${newown} ]]; then
echo "0 is not a defined user on the system"
exit 1
fi
chown $newown /etc/ssh/sshd_config
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: Gather the package facts
package_facts:
manager: auto
tags:
- NIST-800-53-AC-17(a)
- NIST-800-53-AC-6(1)
- NIST-800-53-CM-6(a)
- configure_strategy
- file_owner_sshd_config
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- name: Set the file_owner_sshd_config_newown variable if represented by uid
set_fact:
file_owner_sshd_config_newown: '0'
when: '"linux-base" in ansible_facts.packages'
tags:
- NIST-800-53-AC-17(a)
- NIST-800-53-AC-6(1)
- NIST-800-53-CM-6(a)
- configure_strategy
- file_owner_sshd_config
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- name: Test for existence /etc/ssh/sshd_config
stat:
path: /etc/ssh/sshd_config
register: file_exists
when: '"linux-base" in ansible_facts.packages'
tags:
- NIST-800-53-AC-17(a)
- NIST-800-53-AC-6(1)
- NIST-800-53-CM-6(a)
- configure_strategy
- file_owner_sshd_config
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- name: Ensure owner on /etc/ssh/sshd_config
file:
path: /etc/ssh/sshd_config
owner: '{{ file_owner_sshd_config_newown }}'
when:
- '"linux-base" in ansible_facts.packages'
- file_exists.stat is defined and file_exists.stat.exists
tags:
- NIST-800-53-AC-17(a)
- NIST-800-53-AC-6(1)
- NIST-800-53-CM-6(a)
- configure_strategy
- file_owner_sshd_config
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed