Ansible Role For Security

Set Basic security configuration using rkhunter and clamav.

Examples

Directory tree.

.
├── README.md
├── ansible.cfg
├── group_vars
│   ├── all.yml
│   ├── webserver_centos.yml
│   └── webserver_ubuntu.yml
├── inventory
└── webservers.yml

Inventory file

[webservers:children]
webserver_ubuntu
webserver_centos

[webserver_ubuntu]
ubuntu ansible_host=10.10.10.10 ansible_port=22

[webserver_centos]
centos ansible_host=10.10.10.11 ansible_port=22

Group Vars / Common settings(all.yml)

all.yml sets common variables.

# Common settings
become: yes
ansible_user: root

# Private_key is saved in local host only!
ansible_ssh_private_key_file: ""

Group Vars / Ubuntu(webserver_ubuntu.yml)

webserver_ubuntu.yml is webservers host's children.

This role references the rkhunter* variable and clamav* vairable.

The following example shows that

• rkhunter does not execute propupd as an ansible task.
• rkhunter sends the result of the cron job to root(defined by rkhunter_mail_to)
• Ansible does not run freshclam as a task.
• The command of clamdscan except for some directories(defined by clamav_exclude_paths)
• clamdscan sends the scan result to root(defined by clamav_mail_to)

ansible_user: ubuntu
become: yes
ansible_become_password: 'ThisIsSecret!'

rkhunter_propupd: false
rkhunter_mail_to: root
rkhunter_allow_ssh_root_user: 'no'

clamav_exclude_paths:
  - ^/boot/
  - ^/dev/
  - ^/proc/
  - ^/snap/
  - ^/sys/
  - ~/run
  - ^/var/log/clamav/virus
  - ~/var/lib/
  - ~/var/spool/
clamav_freshclam: no
clamav_mail_to: root

Note

From the second time onwards, freshclam service is running. Therefore freshclam command will fail and you must set the freshclam variable as no.

Group Vars / CentOS(webserver_centos.yml)

webserver_ubuntu.yml is webservers host's children. When appling to CentOS, you can define same parameters.

rkhunter_propupd: false
rkhunter_mail_to: root
rkhunter_allow_ssh_root_user: 'no'

clamav_exclude_paths:
  - ^/boot/
  - ^/dev/
  - ^/proc/
  - ^/snap/
  - ^/sys/
  - ~/run
  - ^/var/log/clamav/virus
  - ~/var/lib/
  - ~/var/spool/
clamav_freshclam: no
clamav_mail_to: root

How to DryRun and Apply

DryRun

ansible-playbook -i inventory --private-key="~/.ssh/your_private_key" -CD webservers.yml --tags security

Apply

ansible-playbook -i inventory --private-key="~/.ssh/your_private_key" -D webservers.yml --tags security