feat(audit): add AWS encryption provider audit rules and update encryption provider script

ansible/host_vars/prod-01.alexpires.me.yml

@@ -143,6 +143,10 @@ encryption_aws_secret_access_key: "{{ lookup('env', 'KMS_SECRET_KEY') }}"
 encryption_kms_arn: "arn:aws:kms:eu-west-1:001604727293:key/977d08fd-8230-40bf-8a4f-d8a3264c5990"
 encryption_kms_socket: /var/run/kmsplugin/socket.sock
 
+#audit encryption socker
+auditd_encryption_kms_socket: /var/run/kmsplugin/socket.sock
+auditd_max_log_file_action: rotate
+
 # Kubernetes specific settings
 microk8s_version: 1.29
 microk8s_allowed_hosts:

ansible/roles/cis/defaults/main/auditd.yml

@@ -10,6 +10,6 @@ auditd_mode: 1
 auditd_num_logs: 5
 auditd_space_left: 75
 auditd_space_left_action: email
+auditd_encryption_kms_socket:
 grub_audit_backlog_cmdline: audit_backlog_limit=8192
 grub_audit_cmdline: audit=1
-...

ansible/roles/cis/templates/etc/audit/rules.d/hardening.rules.j2

@@ -150,6 +150,11 @@
 -w /usr/sbin/runc -p rwxa -k docker
 -w /var/run/docker.sock -p rwxa -k docker
 
+{% if auditd_encryption_kms_socket is defined %}
+# AWS encryption provider
+-w {{ auditd_encryption_kms_socket | dirname }} -p rwxa -k aws-encryption-provider
+{% endif %}
+
 # Group modifications
 -w /etc/group -p wa -k group-modification
 -w /etc/gshadow -p wa -k group-modification

ansible/roles/encryption/templates/start-encryption-provider.sh.j2

@@ -3,4 +3,6 @@
 # Managed by Ansible.
 export AWS_ACCESS_KEY_ID={{ encryption_aws_access_key_id }}
 export AWS_SECRET_ACCESS_KEY={{ encryption_aws_secret_access_key }}
+mkdir {{ encryption_kms_socket_dir | dirname }} }} 2>/dev/null || true
+chmod 700 {{ encryption_kms_socket_dir | dirname }} 2>/dev/null
 /usr/local/bin/aws-encryption-provider --key={{ encryption_kms_arn }} --region={{ encryption_kms_region }} --listen={{ encryption_kms_socket }}