Updated disable IPv6 logic

Signed-off-by: George Nalen <georgen@mindpointgroup.com>

Changelog.md

@@ -1,5 +1,8 @@
 # Changes to rhel9CIS
 
+# Based on CIS v2.0.0
+Added better sysctl logic to disable IPv6
+Added option to disable IPv6 via sysctl (original method) or via the kernel
 
 # Based on CIS v2.0.0
 pre-commit udpates

defaults/main.yml

@@ -731,6 +731,10 @@ rhel9cis_bluetooth_mask: false
 # This variable governs whether ipv6 is enabled or disabled.
 rhel9cis_ipv6_required: true
 
+# 3.1.1 Disable IPv6
+# rhel9cis_ipv6_disable defines the method of disabling IPv6, sysctl vs kernel
+rhel9cis_ipv6_disable_method: "sysctl"
+
 ## 3.1.2 wireless network requirements
 # if wireless adapter found allow network manager to be installed
 rhel9cis_install_network_manager: false

tasks/section_3/cis_3.1.x.yml

@@ -16,15 +16,30 @@
     - rule_3.1.1
     - NIST800-53R5_CM-7
   block:
-    - name: "3.1.1 | PATCH | Ensure IPv6 status is identified | refresh"
+    - name: "3.1.1 | PATCH | Ensure IPv6 status is identified | Set vars for sysctl template"
+      when: "'sysctl' in rhel9cis_ipv6_disable_method"
       ansible.builtin.set_fact:
         rhel9cis_sysctl_update: true
         rhel9cis_flush_ipv6_route: true
 
-    - name: "3.1.1 | PATCH | Ensure IPv6 status is identified | disable"
+    - name: "3.1.1 | AUDIT | Ensure IPv6 status is identified | Message out implementation info"
+      when: "'sysctl' in rhel9cis_ipv6_disable_method"
       ansible.builtin.debug:
         msg: "Control being set via Handler 'update sysctl' which writes to /etc/sysctl.d/60-disable_ipv6.conf"
 
+    - name: "3.1.1 | AUDIT | Ensure IPv6 status is identified | Find IPv6 status"
+      when: "'kernel' in rhel9cis_ipv6_disable_method"
+      ansible.builtin.command: grubby --info=ALL
+      changed_when: false
+      failed_when: false
+      register: discovered_rhel9cis_3_1_1_ipv6_status
+
+    - name: "3.1.1 | PATCH | Ensure IPv6 status is identified | Disable IPV6 via Kernel"
+      when:
+        - "'kernel' in rhel9cis_ipv6_disable_method"
+        - "'ipv6.disable=1' not in discovered_rhel9cis_3_1_1_ipv6_status.stdout"
+      ansible.builtin.shell: grubby --update-kernel=ALL --args="ipv6.disable=1"
+
 - name: "3.1.2 | PATCH | Ensure wireless interfaces are disabled"
   when:
     - rhel9cis_rule_3_1_2

templates/etc/sysctl.d/60-disable_ipv6.conf.j2

@@ -4,4 +4,7 @@
 {% if rhel9cis_rule_3_1_1 and not rhel9cis_ipv6_required %}
 net.ipv6.conf.all.disable_ipv6 = 1
 net.ipv6.conf.default.disable_ipv6 = 1
+{% for interface in ansible_interfaces %}
+net.ipv6.conf.{{ interface }}.disable_ipv6 = 1
+{% endfor %}
 {% endif %}