irc module: add validate_certs, rename use_ssl to use_tls (keeping use_ssl as an alias) (#7550)

* Rename use_ssl to use_tls, keep use_ssl as an alias.

* Add validate_certs option.

* Add changelog fragment and recommend setting TLS related settings to true.

* Fix formatting.

* Update documentation to use use_tls=true and validate_certs=true.

changelogs/fragments/7550-irc-use_tls-validate_certs.yml

@@ -0,0 +1,5 @@
+minor_changes:
+  - "irc - add ``validate_certs`` option, and rename ``use_ssl`` to ``use_tls``, while keeping ``use_ssl`` as an alias.
+     The default value for ``validate_certs`` is ``false`` for backwards compatibility. We recommend to every user of
+     this module to explicitly set ``use_tls=true`` and `validate_certs=true`` whenever possible, especially when
+     communicating to IRC servers over the internet (https://github.com/ansible-collections/community.general/pull/7550)."

plugins/modules/irc.py

@@ -79,11 +79,17 @@ options:
       - Timeout to use while waiting for successful registration and join
         messages, this is to prevent an endless loop
     default: 30
-  use_ssl:
+  use_tls:
     description:
       - Designates whether TLS/SSL should be used when connecting to the IRC server
+      - O(use_tls) is available since community.general 8.1.0, before the option
+        was exlusively called O(use_ssl). The latter is now an alias of O(use_tls).
+      - B(Note:) for security reasons, you should always set O(use_tls=true) and
+        O(validate_certs=true) whenever possible.
     type: bool
     default: false
+    aliases:
+      - use_ssl
   part:
     description:
       - Designates whether user should part from channel after sending message or not.
@@ -96,6 +102,16 @@ options:
       - Text style for the message. Note italic does not work on some clients
     choices: [ "bold", "underline", "reverse", "italic", "none" ]
     default: none
+  validate_certs:
+    description:
+      - If set to V(false), the SSL certificates will not be validated.
+      - This should always be set to V(true). Using V(false) is unsafe and should only be done
+        if the network between between Ansible and the IRC server is known to be safe.
+      - B(Note:) for security reasons, you should always set O(use_tls=true) and
+        O(validate_certs=true) whenever possible.
+    default: false
+    type: bool
+    version_added: 8.1.0
 
 # informational: requirements for nodes
 requirements: [ socket ]
@@ -108,6 +124,8 @@ EXAMPLES = '''
 - name: Send a message to an IRC channel from nick ansible
   community.general.irc:
     server: irc.example.net
+    use_tls: true
+    validate_certs: true
     channel: #t1
     msg: Hello world
 
@@ -116,6 +134,8 @@ EXAMPLES = '''
     module: irc
     port: 6669
     server: irc.example.net
+    use_tls: true
+    validate_certs: true
     channel: #t1
     msg: 'All finished at {{ ansible_date_time.iso8601 }}'
     color: red
@@ -126,6 +146,8 @@ EXAMPLES = '''
     module: irc
     port: 6669
     server: irc.example.net
+    use_tls: true
+    validate_certs: true
     channel: #t1
     nick_to:
       - nick1
@@ -150,7 +172,8 @@ from ansible.module_utils.basic import AnsibleModule
 
 
 def send_msg(msg, server='localhost', port='6667', channel=None, nick_to=None, key=None, topic=None,
-             nick="ansible", color='none', passwd=False, timeout=30, use_ssl=False, part=True, style=None):
+             nick="ansible", color='none', passwd=False, timeout=30, use_tls=False, validate_certs=True,
+             part=True, style=None):
     '''send message to IRC'''
     nick_to = [] if nick_to is None else nick_to
 
@@ -194,14 +217,19 @@ def send_msg(msg, server='localhost', port='6667', channel=None, nick_to=None, k
     message = styletext + colortext + msg
 
     irc = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
-    if use_ssl:
-        if getattr(ssl, 'PROTOCOL_TLS', None) is not None:
-            # Supported since Python 2.7.13
-            context = ssl.SSLContext(ssl.PROTOCOL_TLS)
+    if use_tls:
+        if validate_certs:
+            try:
+                context = ssl.create_default_context()
+            except AttributeError:
+                raise Exception('Need at least Python 2.7.9 for SSL certificate validation')
         else:
-            context = ssl.SSLContext()
-        context.verify_mode = ssl.CERT_NONE
-        # TODO: create a secure context with `context = ssl.create_default_context()` instead!
+            if getattr(ssl, 'PROTOCOL_TLS', None) is not None:
+                # Supported since Python 2.7.13
+                context = ssl.SSLContext(ssl.PROTOCOL_TLS)
+            else:
+                context = ssl.SSLContext()
+            context.verify_mode = ssl.CERT_NONE
         irc = context.wrap_socket(irc)
     irc.connect((server, int(port)))
 
@@ -282,7 +310,8 @@ def main():
             passwd=dict(no_log=True),
             timeout=dict(type='int', default=30),
             part=dict(type='bool', default=True),
-            use_ssl=dict(type='bool', default=False)
+            use_tls=dict(type='bool', default=False, aliases=['use_ssl']),
+            validate_certs=dict(type='bool', default=False),
         ),
         supports_check_mode=True,
         required_one_of=[['channel', 'nick_to']]
@@ -301,12 +330,13 @@ def main():
     key = module.params["key"]
     passwd = module.params["passwd"]
     timeout = module.params["timeout"]
-    use_ssl = module.params["use_ssl"]
+    use_tls = module.params["use_tls"]
     part = module.params["part"]
     style = module.params["style"]
+    validate_certs = module.params["validate_certs"]
 
     try:
-        send_msg(msg, server, port, channel, nick_to, key, topic, nick, color, passwd, timeout, use_ssl, part, style)
+        send_msg(msg, server, port, channel, nick_to, key, topic, nick, color, passwd, timeout, use_tls, validate_certs, part, style)
     except Exception as e:
         module.fail_json(msg="unable to send to IRC: %s" % to_native(e), exception=traceback.format_exc())