ferm

Install ferm package.

Requirements

This role requires Ansible 2.2 or higher, and platform requirements are listed in the metadata file.

Testing

This role use Molecule to run tests.

Local and Travis tests run tests on Docker by default. See molecule documentation to use other backend.

Currently, tests are done on:

• Debian Jessie
• Ubuntu Trusty
• Ubuntu Xenial

and use:

• Ansible 2.2.x
• Ansible 2.3.x
• Ansible 2.4.x

Running tests

Using Docker driver

$ tox

Role Variables

Default role variables

# Repository management
ferm_repository_cache_valid_time: 3600
ferm_repository_update_cache: True

# Packages management
ferm_packages: "{{ _ferm_packages }}"

# Service management
ferm_service_enabled: True
ferm_service_name: "{{ _ferm_service_name }}"

# Paths management
ferm_config_directories_owner: 'root'
ferm_config_directories_group: 'root'
ferm_config_directories_mode: '0700'

ferm_config_files_owner: 'root'
ferm_config_files_group: 'root'
ferm_config_files_mode: '0400'

ferm_main_config_directory: '/etc/ferm'


# Configuration
# -----------------------------------------------------------------------------
ferm_variables: None
ferm_functions: None
ferm_rules: "{{ _ferm_rules }}"
ferm_hooks: |
  # Reload fail2ban rules automaticaly
  @hook post "type fail2ban-server > /dev/null && (fail2ban-client ping > /dev/null && fail2ban-client reload > /dev/null || true) || true";
  @hook flush "type fail2ban-server > /dev/null && (fail2ban-client ping > /dev/null && fail2ban-client reload > /dev/null || true) || true";

Debian OS family variables

# Package management
_ferm_packages:
  - name: 'iptables'
  - name: 'ferm'

# Service management
_ferm_service_name: 'ferm'

# Configuration
_ferm_rules: |
  table filter {
    chain INPUT {
      policy DROP;
      # connection tracking
      mod state state INVALID DROP;
      mod state state (ESTABLISHED RELATED) ACCEPT;
      # allow local packet
      interface lo ACCEPT;
      # respond to ping
      proto icmp ACCEPT;
      # allow IPsec
      proto udp dport 500 ACCEPT;
      proto (esp ah) ACCEPT;
      # allow SSH connections
      proto tcp dport ssh ACCEPT;
    }
    chain OUTPUT {
      policy ACCEPT;
      # connection tracking
      mod state state INVALID DROP;
      mod state state (ESTABLISHED RELATED) ACCEPT;
    }
    chain FORWARD {
      policy DROP;
      # connection tracking
      mod state state INVALID DROP;
      mod state state (ESTABLISHED RELATED) ACCEPT;
    }
  }

How manage configuration

Because Ferm configuration is rich, and I want this role keep simple, the configuration is done via four variables:

• ferm_variables
• ferm_functions
• ferm_rules
• ferm_hooks

No process is done on these variables, their content is copied in configuration file

Example, to define hooks to reload fail2ban automaticaly:

ferm_hooks: |
  @hook post "type fail2ban-server > /dev/null && (fail2ban-client ping > /dev/null && fail2ban-client reload > /dev/null || true) || true";
  @hook flush "type fail2ban-server > /dev/null && (fail2ban-client ping > /dev/null && fail2ban-client reload > /dev/null || true) || true";

Dependencies

None

Example Playbook

- hosts: servers
  roles:
    - { role: Temelio.ferm }

License

MIT

Author Information

Alexandre Chaussier (for Temelio company)

• http://www.temelio.com
• alexandre.chaussier [at] temelio.com