Allow remote path for authorized_key

changelogs/fragments/568_update_authorized_key.yml

@@ -0,0 +1,3 @@
+---
+minor_changes:
+  - authorized_keys - allow using absolute path to a file as a SSH key(s) source (https://github.com/ansible-collections/ansible.posix/pull/568)

plugins/modules/authorized_key.py

@@ -24,6 +24,7 @@
   key:
     description:
       - The SSH public key(s), as a string or (since Ansible 1.9) url (https://github.com/username.keys).
+      - You can also use V(file://) prefix to search remote for a file with SSH key(s).
     type: str
     required: true
   path:
@@ -96,6 +97,12 @@
     state: present
     key: https://github.com/charlie.keys
 
+- name: Set authorized keys taken from path on controller node
+  ansible.posix.authorized_key:
+    user: charlie
+    state: present
+    key: file:///home/charlie/.ssh/id_rsa.pub
+
 - name: Set authorized keys taken from url using lookup
   ansible.posix.authorized_key:
     user: charlie
@@ -223,6 +230,7 @@
 from ansible.module_utils._text import to_native
 from ansible.module_utils.basic import AnsibleModule
 from ansible.module_utils.urls import fetch_url
+from ansible.module_utils.six.moves.urllib.parse import urlparse
 
 
 class keydict(dict):
@@ -556,7 +564,7 @@ def enforce_state(module, params):
     follow = params.get('follow', False)
     error_msg = "Error getting key from: %s"
 
-    # if the key is a url, request it and use it as key source
+    # if the key is a url or file, request it and use it as key source
     if key.startswith("http"):
         try:
             resp, info = fetch_url(module, key)
@@ -570,6 +578,19 @@ def enforce_state(module, params):
         # resp.read gives bytes on python3, convert to native string type
         key = to_native(key, errors='surrogate_or_strict')
 
+    if key.startswith("file"):
+        # if the key is an absolute path, check for existense and use it as a key source
+        key_path = urlparse(key).path
+        if not os.path.exists(key_path):
+            module.fail_json(msg="Path to a key file not found: %s" % key_path)
+        if not os.path.isfile(key_path):
+            module.fail_json(msg="Path to a key is a directory and must be a file: %s" % key_path)
+        try:
+            with open(key_path, 'r') as source_fh:
+                key = source_fh.read()
+        except OSError as e:
+            module.fail_json(msg="Failed to read key file %s : %s" % (key_path, to_native(e)))
+
     # extract individual keys into an array, skipping blank lines and comments
     new_keys = [s for s in key.splitlines() if s and not s.startswith('#')]
 

tests/integration/targets/authorized_key/defaults/main.yml

@@ -35,3 +35,5 @@ multiple_keys_comments: |
   ssh-rsa DATA_BASIC 1@testing
   # I like adding comments yo-dude-this-is-not-a-key INVALID_DATA 2@testing
   ecdsa-sha2-nistp521 ECDSA_DATA 4@testing
+
+key_path: /tmp/id_rsa.pub

tests/integration/targets/authorized_key/tasks/check_path.yml

@@ -0,0 +1,32 @@
+---
+- name: Create key file for test
+  ansible.builtin.copy:
+    dest: "{{ key_path }}"
+    content: "{{ rsa_key_basic }}"
+    mode: "0600"
+
+- name: Add key using path
+  ansible.posix.authorized_key:
+    user: root
+    key: file://{{ key_path }}
+    state: present
+    path: "{{ output_dir | expanduser }}/authorized_keys"
+  register: result
+
+- name: Assert that the key was added
+  ansible.builtin.assert:
+    that:
+      - result.changed == true
+
+- name: Add key using path again
+  ansible.posix.authorized_key:
+    user: root
+    key: file://{{ key_path }}
+    state: present
+    path: "{{ output_dir | expanduser }}/authorized_keys"
+  register: result
+
+- name: Assert that no changes were applied
+  ansible.builtin.assert:
+    that:
+      - result.changed == false

tests/integration/targets/authorized_key/tasks/main.yml

@@ -31,3 +31,6 @@
 
 - name: Test for the management of comments with key
   ansible.builtin.import_tasks: comments.yml
+
+- name: Test for specifying key as a path
+  ansible.builtin.import_tasks: check_path.yml