feat: Allow creating encrypted Stratis Pools with Clevis/Tang

Tang server configuration or TPM2 can now be used when creating
an encrypted Stratis Pool.

Related: RHEL-31854

README.md

@@ -112,6 +112,21 @@ keys:
 
   This integer specifies the LUKS version to use.
 
+- `encryption_clevis_pin`
+
+  For Stratis pools, zhe clevis method that should be used to encrypt the created pool.
+  Accepted values are: `tang` and `tpm2`
+
+- `encryption_tang_url`
+
+  When creating a Stratis pool encrypted via NBDE using a tang server,
+  specifies the URL of the server.
+
+- `encryption_tang_thumbprint`
+
+  When creating a Stratis pool encrypted via NBDE using a tang server,
+  specifies the thumbprint of the server.
+
 ### `storage_volumes`
 
 The `storage_volumes` variable is a list of volumes to manage. Each volume has the following

library/blivet.py

@@ -51,6 +51,15 @@
             encryption_password:
                 description: encryption_password
                 type: str
+            encryption_clevis_pin:
+                description: encryption_clevis_pin
+                type: str
+            encryption_tang_url:
+                description: encryption_tang_url
+                type: str
+            encryption_tang_thumbprint:
+                description: encryption_tang_thumbprint
+                type: str
             name:
                 description: name
                 type: str
@@ -1907,6 +1916,12 @@ def _update_from_device(self, param_name):
             self._pool['disks'] = [d.name for d in self._device.disks]
         elif param_name == 'encryption':
             self._pool['encryption'] = self._device.encrypted
+        elif param_name == 'encryption_clevis_pin':
+            self._pool['encryption_clevis_pin'] = self._device._clevis.pin
+        elif param_name == 'encryption_tang_url':
+            self._pool['encryption_tang_url'] = self._device._clevis.tang_url
+        elif param_name == 'encryption_tang_thumbprint':
+            self._pool['encryption_tang_thumbprint'] = self._device._clevis.tang_thumbprint
         else:
             return False
 
@@ -1961,11 +1976,19 @@ def _create(self):
         if not self._device:
             members = self._create_members()
             try:
+                if self._spec_dict['encryption'] and self._spec_dict['encryption_clevis_pin']:
+                    clevis_config = devices.stratis.StratisClevisConfig(pin=self._spec_dict['encryption_clevis_pin'],
+                                                                        tang_url=self._spec_dict['encryption_tang_url'],
+                                                                        tang_thumbprint=self._spec_dict['encryption_tang_thumbprint'])
+                else:
+                    clevis_config = None
+
                 pool_device = self._blivet.new_stratis_pool(name=self._pool['name'],
                                                             parents=members,
                                                             encrypted=self._spec_dict['encryption'],
                                                             passphrase=self._spec_dict.get('encryption_password') or None,
-                                                            key_file=self._spec_dict.get('encryption_key') or None)
+                                                            key_file=self._spec_dict.get('encryption_key') or None,
+                                                            clevis=clevis_config)
             except Exception as e:
                 raise BlivetAnsibleError("failed to set up pool '%s': %s" % (self._pool['name'], str(e)))
 
@@ -2291,6 +2314,9 @@ def run_module():
                                 encryption_key_size=dict(type='int'),
                                 encryption_luks_version=dict(type='str'),
                                 encryption_password=dict(type='str', no_log=True),
+                                encryption_clevis_pin=dict(type='str'),
+                                encryption_tang_url=dict(type='str'),
+                                encryption_tang_thumbprint=dict(type='str'),
                                 name=dict(type='str'),
                                 raid_level=dict(type='str'),
                                 raid_device_count=dict(type='int'),

tests/tests_stratis.yml

@@ -206,3 +206,40 @@
 
         - name: Verify role results
           include_tasks: verify-role-results.yml
+
+        - name: Setup Tang server on localhost for testing
+          ansible.builtin.include_role:
+            name: linux-system-roles.nbde_server
+          vars:
+            nbde_server_manage_firewall: true
+            nbde_server_manage_selinux: true
+            nbde_server_port: 7500
+
+        - name: Create encrypted Stratis pool with Clevis/Tang
+          include_role:
+            name: linux-system-roles.storage
+          vars:
+            storage_pools:
+              - name: foo
+                disks: "{{ unused_disks[0] }}"
+                type: stratis
+                encryption: true
+                encryption_password: yabbadabbadoo
+                encryption_clevis_pin: tang
+                encryption_tang_url: localhost:7500
+
+        - name: Verify role results
+          include_tasks: verify-role-results.yml
+
+        - name: Clean up
+          include_role:
+            name: linux-system-roles.storage
+          vars:
+            storage_pools:
+              - name: foo
+                disks: "{{ unused_disks[0] }}"
+                type: stratis
+                state: absent
+
+        - name: Verify role results
+          include_tasks: verify-role-results.yml

tests/verify-pool-stratis.yml

@@ -39,3 +39,16 @@
       when:
         - storage_test_pool.state == 'present'
         - storage_test_pool.encryption
+
+    - name: Verify that Clevis/Tang encryption is correctly set
+      assert:
+        that:
+          _stratis_pool_info[0]['blockdevs']['datadevs'][0]['clevis_pin'] == 'tang' and
+          _stratis_pool_info[0]['blockdevs']['datadevs'][0]['clevis_config']['url'] ==
+          storage_test_pool.encryption_tang_url
+        msg: >-
+          Stratis pool '{{ storage_test_pool.name }}' Clevis is not correctly configured
+      when:
+        - storage_test_pool.state == 'present'
+        - storage_test_pool.encryption
+        - storage_test_pool.encryption_clevis_pin == 'tang'