copy - redact 'content' from invocation in check mode (#71033)

* sanitize copy module invocation secrets in check mode

changelogs/fragments/copy-sanitize-check-mode-invocation-args.yaml

@@ -0,0 +1,7 @@
+security_fixes:
+- >
+  **security issue** - copy - Redact the value of the no_log 'content'
+  parameter in the result's invocation.module_args in check mode.
+  Previously when used with check mode and with '-vvv', the module
+  would not censor the content if a change would be made to the
+  destination path. (CVE-2020-14332)

lib/ansible/plugins/action/copy.py

@@ -209,6 +209,8 @@ class ActionModule(ActionBase):
         # NOTE: adding invocation arguments here needs to be kept in sync with
         # any no_log specified in the argument_spec in the module.
         # This is not automatic.
+        # NOTE: do not add to this. This should be made a generic function for action plugins.
+        # This should also use the same argspec as the module instead of keeping it in sync.
         if 'invocation' not in result:
             if self._play_context.no_log:
                 result['invocation'] = "CENSORED: no_log is set"
@@ -218,8 +220,11 @@ class ActionModule(ActionBase):
                 result['invocation'] = self._task.args.copy()
                 result['invocation']['module_args'] = self._task.args.copy()
 
-        if isinstance(result['invocation'], dict) and 'content' in result['invocation']:
+        if isinstance(result['invocation'], dict):
+            if 'content' in result['invocation']:
                 result['invocation']['content'] = 'CENSORED: content is a no_log parameter'
+            if result['invocation'].get('module_args', {}).get('content') is not None:
+                result['invocation']['module_args']['content'] = 'VALUE_SPECIFIED_IN_NO_LOG_PARAMETER'
 
         return result
 

test/integration/targets/copy/tasks/main.yml

@@ -77,6 +77,8 @@
     - import_tasks: selinux.yml
       when: ansible_os_family == 'RedHat' and ansible_selinux.get('mode') == 'enforcing'
 
+    - import_tasks: no_log.yml
+
     - import_tasks: check_mode.yml
 
     # https://github.com/ansible/ansible/issues/57618

test/integration/targets/copy/tasks/no_log.yml

@@ -0,0 +1,82 @@
+- block:
+
+    - set_fact:
+        dest: "{{ local_temp_dir }}/test_no_log"
+
+    - name: ensure playbook and dest files don't exist yet
+      file:
+        path: "{{ item }}"
+        state: absent
+      loop:
+        - "{{ local_temp_dir }}/test_no_log.yml"
+        - "{{ dest }}"
+
+    - name: create a playbook to run with command
+      copy:
+        dest: "{{local_temp_dir}}/test_no_log.yml"
+        content: !unsafe |
+          ---
+          - hosts: localhost
+            gather_facts: no
+            tasks:
+            - copy:
+                dest: "{{ dest }}"
+                content: "{{ secret }}"
+
+    - name: copy the secret while using -vvv and check mode
+      command: "ansible-playbook {{local_temp_dir}}/test_no_log.yml -vvv -e secret=SECRET -e dest={{dest}} --check"
+      register: result
+
+    - assert:
+        that:
+          - "'SECRET' not in result.stdout"
+
+    - name: copy the secret while using -vvv
+      command: "ansible-playbook {{local_temp_dir}}/test_no_log.yml -vvv -e secret=SECRET -e dest={{dest}}"
+      register: result
+
+    - assert:
+        that:
+          - "'SECRET' not in result.stdout"
+
+    - name: copy the secret while using -vvv and check mode again
+      command: "ansible-playbook {{local_temp_dir}}/test_no_log.yml -vvv -e secret=SECRET -e dest={{dest}} --check"
+      register: result
+
+    - assert:
+        that:
+          - "'SECRET' not in result.stdout"
+
+    - name: copy the secret while using -vvv again
+      command: "ansible-playbook {{local_temp_dir}}/test_no_log.yml -vvv -e secret=SECRET -e dest={{dest}}"
+      register: result
+
+    - assert:
+        that:
+          - "'SECRET' not in result.stdout"
+
+    - name: copy a new secret while using -vvv and check mode
+      command: "ansible-playbook {{local_temp_dir}}/test_no_log.yml -vvv -e secret=NEWSECRET -e dest={{dest}} --check"
+      register: result
+
+    - assert:
+        that:
+          - "'NEWSECRET' not in result.stdout"
+
+    - name: copy a new secret while using -vvv
+      command: "ansible-playbook {{local_temp_dir}}/test_no_log.yml -vvv -e secret=NEWSECRET -e dest={{dest}}"
+      register: result
+
+    - assert:
+        that:
+          - "'NEWSECRET' not in result.stdout"
+
+  always:
+
+    - name: remove temp test files
+      file:
+        path: "{{ item }}"
+        state: absent
+      loop:
+        - "{{ local_temp_dir }}/test_no_log.yml"
+        - "{{ dest }}"