feat(configuration): generic FDE with systemd-cryptenroll, clevis fallback, and configurable initramfs

roles/configuration/tasks/encryption/tpm2.yml

@@ -1,26 +1,35 @@
 ---
+# TPM2 enrollment via systemd-cryptenroll.
+# Works with dracut and mkinitcpio (sd-encrypt). The user-set passphrase
+# remains as a backup unlock method — no auto-generated keyfiles.
 - name: Enroll TPM2 for LUKS
   block:
-    # Tempfile in chroot /tmp — accessible by both chroot and host commands
     - name: Create temporary passphrase file for TPM2 enrollment
       ansible.builtin.tempfile:
-        path: /mnt/tmp
+        path: /mnt/root
         prefix: luks-passphrase-
         state: file
-      register: configuration_luks_tpm2_passphrase_tempfile
+      register: _tpm2_passphrase_tempfile
 
-    - name: Write passphrase into temporary file for TPM2 enrollment
+    - name: Write passphrase into temporary file
       ansible.builtin.copy:
-        dest: "{{ configuration_luks_tpm2_passphrase_tempfile.path }}"
+        dest: "{{ _tpm2_passphrase_tempfile.path }}"
         content: "{{ configuration_luks_passphrase }}"
         owner: root
         group: root
         mode: "0600"
       no_log: true
 
-    - name: Enroll TPM2 token
+    - name: Ensure TPM device is accessible in chroot
+      ansible.builtin.shell: >-
+        ls /mnt/dev/tpmrm0 2>/dev/null
+        || (ls /dev/tpmrm0 && cp -a /dev/tpmrm0 /mnt/dev/tpmrm0)
+      changed_when: false
+      failed_when: false
+
+    - name: Enroll TPM2 token via systemd-cryptenroll
       vars:
-        configuration_luks_enroll_args: >-
+        _enroll_args: >-
           {{
             [
               '/usr/bin/systemd-cryptenroll',
@@ -28,69 +37,28 @@
               '--tpm2-with-pin=false',
               '--wipe-slot=tpm2',
               '--unlock-key-file=' + (
-                configuration_luks_tpm2_passphrase_tempfile.path
-                | regex_replace('^/mnt', '')
+                _tpm2_passphrase_tempfile.path | regex_replace('^/mnt', '')
               )
             ]
             + (['--tpm2-pcrs=' + configuration_luks_tpm2_pcrs]
                if configuration_luks_tpm2_pcrs | length > 0 else [])
             + [configuration_luks_device]
           }}
-        configuration_luks_enroll_chroot_cmd: >-
-          {{ chroot_command }} {{ configuration_luks_enroll_args | join(' ') }}
-      ansible.builtin.command: "{{ configuration_luks_enroll_chroot_cmd }}"
-      register: configuration_luks_tpm2_enroll_chroot
-      changed_when: configuration_luks_tpm2_enroll_chroot.rc == 0
-      failed_when: false
+      ansible.builtin.command: "{{ chroot_command }} {{ _enroll_args | join(' ') }}"
+      register: _tpm2_enroll_result
+      changed_when: _tpm2_enroll_result.rc == 0
 
-    - name: Retry TPM2 enrollment in installer environment
-      when:
-        - (configuration_luks_tpm2_enroll_chroot.rc | default(1)) != 0
-      vars:
-        configuration_luks_enroll_args: >-
-          {{
-            [
-              '/usr/bin/systemd-cryptenroll',
-              '--tpm2-device=' + configuration_luks_tpm2_device,
-              '--tpm2-with-pin=false',
-              '--wipe-slot=tpm2',
-              '--unlock-key-file=' + configuration_luks_tpm2_passphrase_tempfile.path
-            ]
-            + (['--tpm2-pcrs=' + configuration_luks_tpm2_pcrs]
-               if configuration_luks_tpm2_pcrs | length > 0 else [])
-            + [configuration_luks_device]
-          }}
-      ansible.builtin.command:
-        argv: "{{ configuration_luks_enroll_args }}"
-      register: configuration_luks_tpm2_enroll_host
-      changed_when: configuration_luks_tpm2_enroll_host.rc == 0
-      failed_when: false
-
-    - name: Validate TPM2 enrollment succeeded
-      ansible.builtin.assert:
-        that:
-          - >-
-            (configuration_luks_tpm2_enroll_chroot.rc | default(1)) == 0
-            or (configuration_luks_tpm2_enroll_host.rc | default(1)) == 0
-        fail_msg: >-
-          TPM2 enrollment failed.
-          chroot rc={{ configuration_luks_tpm2_enroll_chroot.rc | default('n/a') }},
-          host rc={{ configuration_luks_tpm2_enroll_host.rc | default('n/a') }},
-          chroot stderr={{ configuration_luks_tpm2_enroll_chroot.stderr | default('') }},
-          host stderr={{ configuration_luks_tpm2_enroll_host.stderr | default('') }}
   rescue:
-    - name: Warn about TPM2 enrollment failure
+    - name: TPM2 enrollment failed
       ansible.builtin.debug:
         msg: >-
-          WARNING: TPM2 enrollment failed — falling back to keyfile auto-decrypt.
-          The system will use a keyfile instead of TPM2 for automatic LUKS unlock.
+          TPM2 enrollment failed: {{ _tpm2_enroll_result.stderr | default('unknown') }}.
+          The system will require the passphrase for LUKS unlock on boot.
+          TPM2 can be enrolled post-deployment via: systemd-cryptenroll --tpm2-device=auto {{ configuration_luks_device }}
 
-    - name: Fallback to keyfile auto-decrypt
-      ansible.builtin.set_fact:
-        configuration_luks_auto_method: keyfile
   always:
-    - name: Remove TPM2 enrollment passphrase file
-      when: configuration_luks_tpm2_passphrase_tempfile.path is defined
+    - name: Remove temporary passphrase file
+      when: _tpm2_passphrase_tempfile.path is defined
       ansible.builtin.file:
-        path: "{{ configuration_luks_tpm2_passphrase_tempfile.path }}"
+        path: "{{ _tpm2_passphrase_tempfile.path }}"
         state: absent