Ansible-Bootstrap/roles/cis/tasks/security_lines.yml

---
- name: Restrict core dumps
  when: cis_effective_rules.core_dumps | default(false)
  ansible.builtin.lineinfile:
    path: /mnt/etc/security/limits.conf
    regexp: '^\*\s+hard\s+core\s+'
    line: "* hard core 0"

- name: Ensure the systemd coredump drop-in directory exists (CIS L1+)
  when:
    - cis_effective_rules.core_dumps | default(false)
    - cis_strict | default(false)
  ansible.builtin.file:
    path: /mnt/etc/systemd/coredump.conf.d
    state: directory
    mode: "0755"

- name: Disable systemd core dump storage and backtraces (CIS L1+)
  when:
    - cis_effective_rules.core_dumps | default(false)
    - cis_strict | default(false)
  ansible.builtin.copy:
    dest: /mnt/etc/systemd/coredump.conf.d/10-cis.conf
    mode: "0644"
    content: |
      [Coredump]
      Storage=none
      ProcessSizeMax=0

- name: Set password quality requirements
  when: cis_effective_rules.pwquality | default(false)
  ansible.builtin.lineinfile:
    path: /mnt/etc/security/pwquality.conf
    regexp: "{{ item.regexp }}"
    line: "{{ item.line }}"
  loop:
    - {regexp: '^\s*#?\s*minlen\s*=', line: "minlen = {{ cis_cfg.pwquality_minlen }}"}
    - {regexp: '^\s*#?\s*dcredit\s*=', line: "dcredit = -1"}
    - {regexp: '^\s*#?\s*ucredit\s*=', line: "ucredit = -1"}
    - {regexp: '^\s*#?\s*ocredit\s*=', line: "ocredit = -1"}
    - {regexp: '^\s*#?\s*lcredit\s*=', line: "lcredit = -1"}
  loop_control:
    label: "{{ item.line }}"

# Stricter complexity SSG cis_server_l1 checks; affects only new-password changes.
- name: Set strict password quality requirements (CIS L1+)
  when:
    - cis_effective_rules.pwquality | default(false)
    - cis_strict | default(false)
  ansible.builtin.lineinfile:
    path: /mnt/etc/security/pwquality.conf
    regexp: "{{ item.regexp }}"
    line: "{{ item.line }}"
  loop:
    - {regexp: '^\s*#?\s*difok\s*=', line: "difok = {{ cis_cfg.pwquality_difok }}"}
    - {regexp: '^\s*#?\s*maxrepeat\s*=', line: "maxrepeat = {{ cis_cfg.pwquality_maxrepeat }}"}
    - {regexp: '^\s*#?\s*maxsequence\s*=', line: "maxsequence = {{ cis_cfg.pwquality_maxsequence }}"}
    - {regexp: '^\s*#?\s*minclass\s*=', line: "minclass = {{ cis_cfg.pwquality_minclass }}"}
    - {regexp: '^\s*#?\s*dictcheck\s*=', line: "dictcheck = {{ cis_cfg.pwquality_dictcheck }}"}
    - {regexp: '^\s*#?\s*enforce_for_root\b', line: "enforce_for_root"}
  loop_control:
    label: "{{ item.line }}"

- name: Set the default shell umask
  when: cis_effective_rules.umask_default | default(false)
  ansible.builtin.lineinfile:
    path: '/mnt/etc/{{ "bashrc" if is_rhel else "bash.bashrc" }}'
    regexp: '^\s*umask\s+\d+'
    line: "umask {{ cis_cfg.umask }}"

- name: Set the shell idle timeout
  when: cis_effective_rules.shell_timeout | default(false)
  ansible.builtin.lineinfile:
    path: '/mnt/etc/{{ "bashrc" if is_rhel else "bash.bashrc" }}'
    regexp: '^\s*(export\s+)?TMOUT='
    line: "export TMOUT={{ cis_cfg.tmout }}"

# A drop-in survives systemd upgrades; the RHEL vendor journald.conf does not.
- name: Ensure the journald drop-in directory exists
  when: cis_effective_rules.journald_persistent | default(false)
  ansible.builtin.file:
    path: /mnt/etc/systemd/journald.conf.d
    state: directory
    mode: "0755"

- name: Enable persistent journald storage
  when: cis_effective_rules.journald_persistent | default(false)
  ansible.builtin.copy:
    dest: /mnt/etc/systemd/journald.conf.d/10-cis.conf
    mode: "0644"
    content: |
      [Journal]
      Storage=persistent

- name: Compress large journald log files (CIS L1+)
  when:
    - cis_effective_rules.journald_persistent | default(false)
    - cis_strict | default(false)
  ansible.builtin.copy:
    dest: /mnt/etc/systemd/journald.conf.d/20-cis-compress.conf
    mode: "0644"
    content: |
      [Journal]
      Compress=yes

- name: Log sudo commands
  when: cis_effective_rules.sudo_logfile | default(false)
  ansible.builtin.lineinfile:
    path: /mnt/etc/sudoers
    regexp: '^\s*Defaults\s+logfile='
    line: 'Defaults        logfile="/var/log/sudo.log"'

- name: Require a pty for sudo (CIS L1+)
  when:
    - cis_effective_rules.sudo_logfile | default(false)
    - cis_strict | default(false)
  ansible.builtin.lineinfile:
    path: /mnt/etc/sudoers
    regexp: '^\s*Defaults\s+use_pty\b'
    line: "Defaults        use_pty"

- name: Restrict su to the wheel group
  when: cis_effective_rules.su_restriction | default(false)
  ansible.builtin.lineinfile:
    path: /mnt/etc/pam.d/su
    regexp: '^\s*#?\s*auth\s+required\s+pam_wheel\.so'
    line: auth required pam_wheel.so

# authselect wires the pam_faillock stack via the feature; deny/unlock_time live
# in faillock.conf, the supported place (pam_faillock(8) deprecates module args).
- name: Configure account lockout (authselect)
  when:
    - cis_effective_rules.faillock | default(false)
    - is_authselect | bool
  block:
    - name: Enable the authselect faillock feature
      ansible.builtin.command: "{{ chroot_command }} authselect enable-feature with-faillock"
      register: cis_faillock_result
      changed_when: cis_faillock_result.rc == 0

    - name: Set faillock thresholds
      ansible.builtin.lineinfile:
        path: /mnt/etc/security/faillock.conf
        regexp: "{{ item.regexp }}"
        line: "{{ item.line }}"
        create: true
        mode: "0644"
      loop:
        - {regexp: '^\s*#?\s*deny\s*=', line: "deny = {{ cis_cfg.faillock_deny }}"}
        - {regexp: '^\s*#?\s*unlock_time\s*=', line: "unlock_time = {{ cis_cfg.faillock_unlock_time }}"}
      loop_control:
        label: "{{ item.line }}"

- name: Configure account lockout
  when:
    - cis_effective_rules.faillock | default(false)
    - not is_authselect | bool
  ansible.builtin.lineinfile:
    path: "{{ item.path }}"
    regexp: "{{ item.regexp }}"
    line: "{{ item.line }}"
  loop:
    - path: '/mnt/etc/{{ "pam.d/common-auth" if is_debian | bool else "pam.d/system-auth" }}'
      regexp: '^\s*auth\s+required\s+pam_faillock\.so'
      line: >-
        auth required pam_faillock.so onerr=fail audit silent deny={{ cis_cfg.faillock_deny }} unlock_time={{ cis_cfg.faillock_unlock_time }}
    - path: '/mnt/etc/{{ "pam.d/common-account" if is_debian | bool else "pam.d/system-auth" }}'
      regexp: '^\s*account\s+required\s+pam_faillock\.so'
      line: account required pam_faillock.so
  loop_control:
    label: "{{ item.regexp }}"

- name: Enforce password history
  when: cis_effective_rules.password_history | default(false)
  ansible.builtin.lineinfile:
    path: >-
      /mnt/etc/pam.d/{{
        "common-password"
        if is_debian | bool
        else "passwd"
      }}
    regexp: '^\s*password\s+\[success=1.*\]\s+pam_unix\.so'
    line: >-
      password [success=1 default=ignore] pam_unix.so obscure sha512 remember={{ cis_cfg.password_remember }}

# SSG cis_server_l1 checks pam_pwhistory (not pam_unix remember) in the auth-stack
# files; affects only password changes, so no login-lockout risk. EL9 has no
# authselect path here (same direct-edit the faillock rule above uses).
- name: Enforce password reuse limit via pam_pwhistory (CIS L1+)
  when:
    - cis_effective_rules.password_history | default(false)
    - cis_strict | default(false)
  ansible.builtin.lineinfile:
    path: "{{ item }}"
    regexp: '^\s*password\s+(requisite|required)\s+pam_pwhistory\.so'
    line: "password    requisite    pam_pwhistory.so use_authtok remember={{ cis_cfg.pwhistory_remember }} enforce_for_root"
    insertbefore: '^\s*password\s+.*pam_unix\.so'
  loop: >-
    {{
      ['/mnt/etc/pam.d/system-auth', '/mnt/etc/pam.d/password-auth']
      if is_rhel | bool
      else (['/mnt/etc/pam.d/common-password'] if is_debian | bool else [])
    }}
  loop_control:
    label: "{{ item }}"


- name: Configure TCP wrappers
  when: cis_effective_rules.tcp_wrappers | default(false)
  ansible.builtin.lineinfile:
    path: "{{ item.path }}"
    regexp: "{{ item.regexp }}"
    line: "{{ item.line }}"
  loop:
    - {path: /mnt/etc/hosts.deny, regexp: '^ALL:\s*ALL', line: "ALL: ALL"}
    - {path: /mnt/etc/hosts.allow, regexp: '^sshd:\s*ALL', line: "sshd: ALL"}
  loop_control:
    label: "{{ item.path }}"