Debian 9 CIS STIG

Configure Debian 9 machine to be CIS compliant. Level 1 and 2 findings will be corrected by default.

This role will make changes to the system that could break things. This is not an auditing tool but rather a remediation tool to be used after an audit has been conducted.

IMPORTANT INSTALL STEP

If you want to install this via the ansible-galaxy command you'll need to run it like this:

ansible-galaxy install -p roles -r requirements.yml

With this in the file requirements.yml:

- src: https://github.com/florianutz/Debian9-CIS.git

Based on CIS Debian Benchmark v1.0.0 - 21-12-2018 .

This repository is a migration from Ubuntu 18.04 Ubuntu1804-CIS. Currently not all tasks have the right number and naming for the official Debian benchmark.

Requirements

You should carefully read through the tasks to make sure these changes will not break your systems before running this playbook.

Role Variables

There are many role variables defined in defaults/main.yml. This list shows the most important.

debian9cis_notauto: Run CIS checks that we typically do NOT want to automate due to the high probability of breaking the system (Default: false)

debian9cis_section1: CIS - General Settings (Section 1) (Default: true)

debian9cis_section2: CIS - Services settings (Section 2) (Default: true)

debian9cis_section3: CIS - Network settings (Section 3) (Default: true)

debian9cis_section4: CIS - Logging and Auditing settings (Section 4) (Default: true)

debian9cis_section5: CIS - Access, Authentication and Authorization settings (Section 5) (Default: true)

debian9cis_section6: CIS - System Maintenance settings (Section 6) (Default: true)

Disable all selinux functions

debian9cis_selinux_disable: false

Service variables:

These control whether a server should or should not be allowed to continue to run these services

debian9cis_avahi_server: false  
debian9cis_cups_server: false  
debian9cis_dhcp_server: false  
debian9cis_ldap_server: false  
debian9cis_telnet_server: false  
debian9cis_nfs_server: false  
debian9cis_rpc_server: false  
debian9cis_ntalk_server: false  
debian9cis_rsyncd_server: false  
debian9cis_tftp_server: false  
debian9cis_rsh_server: false  
debian9cis_nis_server: false  
debian9cis_snmp_server: false  
debian9cis_squid_server: false  
debian9cis_smb_server: false  
debian9cis_dovecot_server: false  
debian9cis_httpd_server: false  
debian9cis_vsftpd_server: false  
debian9cis_named_server: false  
debian9cis_bind: false  
debian9cis_vsftpd: false  
debian9cis_httpd: false  
debian9cis_dovecot: false  
debian9cis_samba: false  
debian9cis_squid: false  
debian9cis_net_snmp: false  

Designate server as a Mail server

debian9cis_is_mail_server: false

System network parameters (host only OR host and router)

debian9cis_is_router: false

IPv6 required

debian9cis_ipv6_required: true

AIDE

debian9cis_config_aide: true

AIDE cron settings

debian9cis_aide_cron:
  cron_user: root
  cron_file: /etc/crontab
  aide_job: '/usr/sbin/aide --check'
  aide_minute: 0
  aide_hour: 5
  aide_day: '*'
  aide_month: '*'
  aide_weekday: '*'  

SELinux policy

debian9cis_selinux_pol: targeted

Set to 'true' if X Windows is needed in your environment

debian9cis_xwindows_required: no

Client application requirements

debian9cis_openldap_clients_required: false
debian9cis_telnet_required: false
debian9cis_talk_required: false  
debian9cis_rsh_required: false
debian9cis_ypbind_required: false

Time Synchronization

debian9cis_time_synchronization: chrony
debian9cis_time_Synchronization: ntp

debian9cis_time_synchronization_servers:
  - uri: "0.pool.ntp.org"
    config: "minpoll 8"
  - uri: "1.pool.ntp.org"
    config: "minpoll 8"
  - uri: "2.pool.ntp.org"
    config: "minpoll 8"
  - uri: "3.pool.ntp.org"
    config: "minpoll 8"

3.4.2 | PATCH | Ensure /etc/hosts.allow is configured

debian9cis_host_allow:
  - "10.0.0.0/255.0.0.0"  
  - "172.16.0.0/255.240.0.0"  
  - "192.168.0.0/255.255.0.0"    

debian9cis_firewall: firewalld
debian9cis_firewall: iptables

5.3.1 | PATCH | Ensure password creation requirements are configured

debian9cis_pwquality:
  - key: 'minlen'
    value: '14'
  - key: 'dcredit'
    value: '-1'
  - key: 'ucredit'
    value: '-1'
  - key: 'ocredit'
    value: '-1'
  - key: 'lcredit'
    value: '-1'

Dependencies

Ansible >= 2.4 and <= 2.7 (2.8 is not yet supported)

Example Playbook

- name: Harden Server
  hosts: servers
  become: yes

  roles:
    - Debian9-CIS

To run the tasks in this repository, first create this file one level above the repository (i.e. the playbook .yml and the directory Debian9-CIS should be next to each other), then review the file defaults/main.yml and disable any rule/section you do not wish to execute.

Assuming you named the file site.yml, run it with:

ansible-playbook site.yml

Tags

Many tags are available for precise control of what is and is not changed.

Some examples of using tags:

    # Audit and patch the site
    ansible-playbook site.yml --tags="patch"

License

MIT