Use one ACME account key per host

This is nicer for us, since this avoids sharing a secret.
Also put certificate directories in `certs` sub-directory for better
organization.

playbooks/roles/cert/meta/argument_specs.yml

@@ -18,17 +18,8 @@ argument_specs:
         required: false
         type: str
         default: root
-      cert__acme_account:
-        description: ACME account details
-        required: true
-        type: dict
-        options:
-          email:
-            description: E-mail address to send certificate expiary notifications to
-            required: true
-            type: str
-          key:
-            description: Private RSA or Elliptic Curve key of the ACME account
+      cert__acme_account_email:
+        description: E-Mail address for ACME account
         required: true
         type: str
       cert__cloudflare_dns:

playbooks/roles/cert/tasks/deploy_cert.yml

@@ -1,4 +1,4 @@
-- name: Ensure certs directory exists
+- name: Ensure `ansible_certs` directory exists
   ansible.builtin.file:
     path: /etc/ansible_certs
     state: directory
@@ -7,18 +7,27 @@
     mode: "755"
   become: true
 
+- name: Ensure `certs` sub-directory exists
+  ansible.builtin.file:
+    path: /etc/ansible_certs/certs
+    state: directory
+    owner: root
+    group: root
+    mode: "755"
+  become: true
+
 - name: Ensure sub-directory for the certificate exists
   ansible.builtin.file:
-    path: "/etc/ansible_certs/{{ item }}"
+    path: "/etc/ansible_certs/certs/{{ item }}"
     state: directory
     owner: "{{ cert__owner }}"
     group: "{{ cert__group }}"
     mode: "755"
   become: true
 
-- name: Ensure private key is generated
+- name: Ensure private key for certificate exists
   community.crypto.openssl_privatekey:
-    path: "/etc/ansible_certs/{{ item }}/key.pem"
+    path: "/etc/ansible_certs/certs/{{ item }}/key.pem"
     size: 4096
     type: RSA
     owner: "{{ cert__owner }}"
@@ -28,8 +37,8 @@
 
 - name: Ensure certificate signing request is created
   community.crypto.openssl_csr:
-    path: "/etc/ansible_certs/{{ item }}/csr.pem"
-    privatekey_path: "/etc/ansible_certs/{{ item }}/key.pem"
+    path: "/etc/ansible_certs/certs/{{ item }}/csr.pem"
+    privatekey_path: "/etc/ansible_certs/certs/{{ item }}/key.pem"
     common_name: "{{ item }}"
     owner: "{{ cert__owner }}"
     group: "{{ cert__group }}"
@@ -37,18 +46,28 @@
   become: true
   register: cert__csr_result
 
+- name: Ensure private key for ACME account exists
+  community.crypto.openssl_privatekey:
+    path: "/etc/ansible_certs/account_key.pem"
+    size: 4096
+    type: RSA
+    owner: root
+    group: root
+    mode: "0600"
+  become: true
+
 - name: Check certificate status and create ACME challenge if needed
   community.crypto.acme_certificate:
-    account_email: "{{ cert__acme_account.email }}"
-    account_key_content: "{{ cert__acme_account.key }}"
+    account_email: "{{ cert__acme_account_email }}"
+    account_key_src: "/etc/ansible_certs/account_key.pem"
     acme_directory: https://acme-v02.api.letsencrypt.org/directory
     acme_version: 2
     remaining_days: 28
     terms_agreed: true
     challenge: dns-01
-    csr: "/etc/ansible_certs/{{ item }}/csr.pem"
-    dest: "/etc/ansible_certs/{{ item }}/cert.pem"
-    fullchain_dest: "/etc/ansible_certs/{{ item }}/fullchain.pem"
+    csr: "/etc/ansible_certs/certs/{{ item }}/csr.pem"
+    dest: "/etc/ansible_certs/certs/{{ item }}/cert.pem"
+    fullchain_dest: "/etc/ansible_certs/certs/{{ item }}/fullchain.pem"
   become: true
   register: cert__acme_challenge
 
@@ -68,16 +87,16 @@
         state: present
     - name: Retrieve certificate
       community.crypto.acme_certificate:
-        account_email: "{{ cert__acme_account.email }}"
-        account_key_content: "{{ cert__acme_account.key }}"
+        account_email: "{{ cert__acme_account_email }}"
+        account_key_src: "/etc/ansible_certs/account_key.pem"
         acme_directory: https://acme-v02.api.letsencrypt.org/directory
         acme_version: 2
         terms_agreed: true
         remaining_days: 28
         challenge: dns-01
-        csr: "/etc/ansible_certs/{{ item }}/csr.pem"
-        dest: "/etc/ansible_certs/{{ item }}/cert.pem"
-        fullchain_dest: "/etc/ansible_certs/{{ item }}/fullchain.pem"
+        csr: "/etc/ansible_certs/certs/{{ item }}/csr.pem"
+        dest: "/etc/ansible_certs/certs/{{ item }}/cert.pem"
+        fullchain_dest: "/etc/ansible_certs/certs/{{ item }}/fullchain.pem"
         data: "{{ cert__acme_challenge }}"
       become: true
       notify: "{{ cert__handlers }}"
@@ -95,7 +114,7 @@
 
 - name: Ensure correct permissions for certificate are set
   ansible.builtin.file:
-    path: "/etc/ansible_certs/{{ item }}/cert.pem"
+    path: "/etc/ansible_certs/certs/{{ item }}/cert.pem"
     owner: "{{ cert__owner }}"
     group: "{{ cert__group }}"
     mode: "0660"
@@ -103,7 +122,7 @@
 
 - name: Ensure correct permissions for fullchain cert are set
   ansible.builtin.file:
-    path: "/etc/ansible_certs/{{ item }}/fullchain.pem"
+    path: "/etc/ansible_certs/certs/{{ item }}/fullchain.pem"
     owner: "{{ cert__owner }}"
     group: "{{ cert__group }}"
     mode: "0660"
@@ -111,20 +130,20 @@
 
 - name: Get content of cert.pem
   ansible.builtin.slurp:
-    src: "/etc/ansible_certs/{{ item }}/cert.pem"
+    src: "/etc/ansible_certs/certs/{{ item }}/cert.pem"
   become: true
   register: cert__cert_slurp
 
 - name: Get content of fullchain.pem
   ansible.builtin.slurp:
-    src: "/etc/ansible_certs/{{ item }}/fullchain.pem"
+    src: "/etc/ansible_certs/certs/{{ item }}/fullchain.pem"
   become: true
   register: cert__fullchain_slurp
 
 - name: Ensure ca.pem is created
   ansible.builtin.copy:
     content: "{{ cert__fullchain_slurp.content | b64decode | replace(cert__cert_slurp.content | b64decode, '') }}"
-    dest: "/etc/ansible_certs/{{ item }}/ca.pem"
+    dest: "/etc/ansible_certs/certs/{{ item }}/ca.pem"
     owner: "{{ cert__owner }}"
     group: "{{ cert__group }}"
     mode: "0660"