infrastructure/roles/hardening/tasks/main.yml

- name: Set restricted access to kernel logs
  copy: src=50-dmesg-restrict.conf dest=/etc/sysctl.d/50-dmesg-restrict.conf owner=root group=root mode=0644
  notify:
    - Apply sysctl settings

- name: Set ptrace scope, restrict ptrace to CAP_SYS_PTRACE
  copy: src=50-ptrace-restrict.conf dest=/etc/sysctl.d/50-ptrace-restrict.conf owner=root group=root mode=0644
  when: "'buildservers' not in group_names"
  notify:
    - Apply sysctl settings

- name: Set restricted access to kernel pointers in proc fs
  copy: src=50-kptr-restrict.conf dest=/etc/sysctl.d/50-kptr-restrict.conf owner=root group=root mode=0644
  notify:
    - Apply sysctl settings

- name: Enable JIT hardening for all users
  copy: src=50-bpf_jit_harden.conf dest=/etc/sysctl.d/50-bpf_jit_harden.conf owner=root group=root mode=0644
  notify:
    - Apply sysctl settings

- name: Disable unprivileged bpf
  copy: src=50-unprivileged_bpf_disabled.conf dest=/etc/sysctl.d/50-unprivileged_bpf_disabled.conf owner=root group=root mode=0644
  notify:
    - Apply sysctl settings

- name: Disable unprivileged userns
  copy: src=50-unprivileged_userns_clone.conf dest=/etc/sysctl.d/50-unprivileged_userns_clone.conf owner=root group=root mode=0644
  notify:
    - Apply sysctl settings

- name: Disable kexec load
  copy: src=50-kexec_load_disabled.conf dest=/etc/sysctl.d/50-kexec_load_disabled.conf owner=root group=root mode=0644
  notify:
    - Apply sysctl settings

- name: Set kernel lockdown to restricted
  copy: src=50-lockdown.conf dest=/etc/tmpfiles.d/50-kernel-lockdown.conf owner=root group=root mode=0644
  when: "'hcloud' in group_names"
  notify:
    - Apply sysctl settings