synchronize - fix password authentication (#66542)

On Python 2, leave all fds open since there is no mechanism to close specific fds with subprocess.Popen() on Python 2

Add unit tests.

Co-authored-by: Matt Martz <matt@sivel.net>

changelogs/fragments/56629-synchronize-password-auth.yaml

@@ -0,0 +1,6 @@
+bugfixes:
+  - synchronize - fix password authentication on Python 2 (https://github.com/ansible/ansible/issues/56629)
+  - >
+    AnsibleModule.run_command() - set ``close_fds`` to ``False`` on Python 2 if ``pass_fds`` are passed to
+    ``run_command()``. Since ``subprocess.Popen()`` on Python 2 does not have the ``pass_fds`` option,
+    there is no way to exclude a specific list of file descriptors from being closed.

lib/ansible/module_utils/basic.py

@@ -2452,9 +2452,10 @@ class AnsibleModule(object):
             are expanded before running the command. When ``True`` a string such as
             ``$SHELL`` will be expanded regardless of escaping. When ``False`` and
             ``use_unsafe_shell=False`` no path or variable expansion will be done.
-        :kw pass_fds: When running on python3 this argument
+        :kw pass_fds: When running on Python 3 this argument
             dictates which file descriptors should be passed
-            to an underlying ``Popen`` constructor.
+            to an underlying ``Popen`` constructor. On Python 2, this will
+            set ``close_fds`` to False.
         :kw before_communicate_callback: This function will be called
             after ``Popen`` object will be created
             but before communicating to the process.
@@ -2565,6 +2566,8 @@ class AnsibleModule(object):
         )
         if PY3 and pass_fds:
             kwargs["pass_fds"] = pass_fds
+        elif PY2 and pass_fds:
+            kwargs['close_fds'] = False
 
         # store the pwd
         prev_dir = os.getcwd()

test/units/module_utils/basic/test_run_command.py

@@ -13,6 +13,7 @@ from io import BytesIO
 import pytest
 
 from ansible.module_utils._text import to_native
+from ansible.module_utils.six import PY2
 
 
 class OpenBytesIO(BytesIO):
@@ -197,3 +198,22 @@ class TestRunCommandOutput:
         # bytes because it's returning native strings
         assert stdout == to_native(u'Žarn§')
         assert stderr == to_native(u'لرئيسية')
+
+
+@pytest.mark.parametrize('stdin', [{}], indirect=['stdin'])
+def test_run_command_fds(mocker, rc_am):
+    subprocess_mock = mocker.patch('ansible.module_utils.basic.subprocess')
+    subprocess_mock.Popen.side_effect = AssertionError
+
+    try:
+        rc_am.run_command('synchronize', pass_fds=(101, 42))
+    except SystemExit:
+        pass
+
+    if PY2:
+        assert subprocess_mock.Popen.call_args[1]['close_fds'] is False
+        assert 'pass_fds' not in subprocess_mock.Popen.call_args[1]
+
+    else:
+        assert subprocess_mock.Popen.call_args[1]['pass_fds'] == (101, 42)
+        assert subprocess_mock.Popen.call_args[1]['close_fds'] is True