Ensure APT has Install-Recommends configured

Description

The Install-Recommends setting makes apt-get or apt not consider recommended packages as a dependency for installing.

Rationale

Reducing the amount of installed packages might reduce any attack surface.

Audit

@test "Verify APT Install-Recommends" {
  run bash -c "grep '^APT::Install-Recommends \"false\";$' /etc/apt/apt.conf.d/*"
  [ "$status" -eq 0 ]
}

Remediation

shell

if ! grep '^APT::Install-Recommends' /etc/apt/apt.conf.d/*; then
  echo 'APT::Install-Recommends "false";' >> /etc/apt/apt.conf.d/01-vendor-ubuntu
else
  sed -i 's/.*APT::Install-Recommends.*/APT::Install-Recommends "false";/g' "$(grep -l 'APT::Install-Recommends' /etc/apt/apt.conf.d/*)"
fi

Ansible

---
- name: configure apt
  become: 'yes'
  become_method: sudo
  lineinfile:
    dest: /etc/apt/apt.conf.d/98apt-conf
    mode: 0644
    state: present
    create: 'yes'
    line: ""
  with_items:
    - 'APT::Get::Install-Recommends "false";'
  when: ansible_os_family == "Debian"
  tags:
    - apt
    - security
...

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