RHEL9-CIS/tasks/section_3/cis_3.4.4.1.x.yml

---

- name: "3.4.4.1.1 | L1 | PATCH | Ensure iptables default deny firewall policy"
  block:
      - name: "3.4.4.1.1 | L1 |  PATCH |  Ensure iptables default deny firewall policy | Configure ssh to be allowed"
        iptables:
            chain: INPUT
            protocol: tcp
            destination_port: "22"
            jump: ACCEPT

      - name: "3.4.4.1.1 | L1 | PATCH | Ensure iptables default deny firewall policy | Set drop items"
        iptables:
            policy: DROP
            chain: "{{ item }}"
        with_items:
            - INPUT
            - FORWARD
            - OUTPUT
  when:
      - rhel9cis_rule_3_4_4_1_1
      - rhel9cis_firewall == "iptables"
  tags:
      - level1-server
      - level1-workstation
      - patch
      - rule_3.4.4.1.1

- name: "3.4.4.1.2 | L1 | PATCH | Ensure iptables loopback traffic is configured"
  block:
      - name: "3.4.4.1.2 | L1 | Ensure iptables loopback traffic is configured | INPUT Loopback ACCEPT"
        iptables:
            action: append
            chain: INPUT
            in_interface: lo
            jump: ACCEPT

      - name: "3.4.4.1.2 | L1 | PATCH | Ensure iptables loopback traffic is configured | OUTPUT Loopback ACCEPT"
        iptables:
            action: append
            chain: OUTPUT
            out_interface: lo
            jump: ACCEPT

      - name: "3.4.4.1.2 | L1 | PATCH | Ensure iptables loopback traffic is configured | INPUT Loopback 127.0.0.0/8"
        iptables:
            action: append
            chain: INPUT
            source: 127.0.0.0/8
            jump: DROP
  when:
      - rhel9cis_firewall == "iptables"
      - rhel9cis_rule_3_4_4_1_2
  tags:
      - level1-server
      - level1-workstation
      - patch
      - rule_3.4.4.1.2

- name: "3.4.4.1.3 | L1 | PATCH | Ensure iptables outbound and established connections are configured"
  iptables:
      action: append
      chain: '{{ item.chain }}'
      protocol: '{{ item.protocol }}'
      match: state
      ctstate: '{{ item.ctstate }}'
      jump: ACCEPT
  with_items:
      - { chain: OUTPUT, protocol: tcp, ctstate: 'NEW,ESTABLISHED' }
      - { chain: OUTPUT, protocol: udp, ctstate: 'NEW,ESTABLISHED' }
      - { chain: OUTPUT, protocol: icmp, ctstate: 'NEW,ESTABLISHED' }
      - { chain: INPUT, protocol: tcp, ctstate: ESTABLISHED }
      - { chain: INPUT, protocol: udp, ctstate: ESTABLISHED }
      - { chain: INPUT, protocol: icmp, ctstate: ESTABLISHED }
  when:
      - rhel9cis_firewall == "iptables"
      - rhel9cis_rule_3_4_4_1_3
  tags:
      - level1-server
      - level1-workstation
      - patch
      - rule_3.4.4.1.3

- name: "3.4.4.1.4 | L1 | PATCH | Ensure iptables firewall rules exist for all open ports"
  block:
      - name: "3.4.4.1.4 | L1 | AUDIT | Ensure iptables firewall rules exist for all open ports | Get list of TCP open ports"
        shell: netstat -ant |grep "tcp.*LISTEN" | awk '{ print $4 }'| sed 's/.*://'
        changed_when: false
        failed_when: false
        register: rhel9cis_3_4_4_1_4_otcp

      - name: "3.4.4.1.4 | L1 | AUDIT | Ensure iptables firewall rules exist for all open ports | Get the list of udp open ports"
        shell: netstat -ant |grep "udp.*LISTEN" | awk '{ print $4 }'| sed 's/.*://'
        changed_when: false
        failed_when: false
        register: rhel9cis_3_4_4_1_4_oudp

      - name: "3.4.4.1.4 | L1 | PATCH | Ensure iptables firewall rules exist for all open ports | Adjust open tcp ports"
        iptables:
            action: append
            chain: INPUT
            protocol: tcp
            destination_port: "{{ item }}"
            match: state
            ctstate: NEW
            jump: ACCEPT
        with_items:
            - "{{ rhel9cis_3_4_4_1_4_otcp.stdout_lines }}"
        when: rhel9cis_3_4_4_1_4_otcp.stdout is defined

      - name: "3.4.4.1.4 | L1 | PATCH | Ensure iptables firewall rules exist for all open ports | Adjust open udp ports"
        iptables:
            action: append
            chain: INPUT
            protocol: udp
            destination_port: "{{ item }}"
            match: state
            ctstate: NEW
            jump: ACCEPT
        with_items:
            - "{{ rhel9cis_3_4_4_1_4_oudp.stdout_lines }}"
        when: rhel9cis_3_4_4_1_4_otcp.stdout is defined
  when:
      - rhel9cis_firewall == "iptables"
      - rhel9cis_rule_3_4_4_1_4
  tags:
      - level1-server
      - level1-workstation
      - patch
      - rule_3.4.4.1.4

- name: "3.4.4.1.5 | L1 | PATCH | Ensure iptables service is enabled and active | Check if iptables is enabled"
  service:
      name: iptables
      enabled: yes
      state: started
  when:
      - rhel9cis_firewall == "iptables"
      - rhel9cis_rule_3_4_4_1_5
  tags:
      - level1-server
      - level1-workstation
      - patch
      - rule_3.4.4.1.5