[Windows] Security model for files permissions - STEP 3a (#6964)

This PR implements the filesystem.chmod method from #6497.

* Implement filesystem.chmod

* Conditionally add pywin32 on setuptools versions that support environment markers.

* Update apache plugin requirements

* Use a try/except import approach similar to lock

* Add comments about well-known SIDs

* Add main command

* Call filesystem.chmod in tests, remove one test

* Add test for os module

* Update environment marker

* Ensure we are not building wheels using an old version of setuptools

* Added a link to list of NTFS rights

* Simplify sid comparison

* Enable coverage

* Sometimes, double-quote is the solution

* Add entrypoint

* Add unit tests to filesystem

* Resolve recursively the link, add doc

* Move imports to the top of the file

* Remove string conversion of the ACL, fix setup

* Ensure admins have all permissions

* Simplify dacl comparison

* Conditionally raise for windows temporary workaround

* Add a test to check filesystem.chown is protected against symlink loops

certbot-apache/certbot_apache/http_01.py

@@ -5,6 +5,7 @@ from acme.magic_typing import List, Set  # pylint: disable=unused-import, no-nam
 
 from certbot import errors
 from certbot.compat import os
+from certbot.compat import filesystem
 from certbot.plugins import common
 
 from certbot_apache.obj import VirtualHost  # pylint: disable=unused-import
@@ -169,7 +170,7 @@ class ApacheHttp01(common.TLSSNI01):
     def _set_up_challenges(self):
         if not os.path.isdir(self.challenge_dir):
             os.makedirs(self.challenge_dir)
-            os.chmod(self.challenge_dir, 0o755)
+            filesystem.chmod(self.challenge_dir, 0o755)
 
         responses = []
         for achall in self.achalls:
@@ -185,7 +186,7 @@ class ApacheHttp01(common.TLSSNI01):
         self.configurator.reverter.register_file_creation(True, name)
         with open(name, 'wb') as f:
             f.write(validation.encode())
-        os.chmod(name, 0o644)
+        filesystem.chmod(name, 0o644)
 
         return response
 

certbot-apache/certbot_apache/tests/configurator_test.py

@@ -16,6 +16,7 @@ from certbot import achallenges
 from certbot import crypto_util
 from certbot import errors
 from certbot.compat import os
+from certbot.compat import filesystem
 from certbot.tests import acme_util
 from certbot.tests import util as certbot_util
 
@@ -1366,7 +1367,7 @@ class MultipleVhostsTest(util.ApacheTest):
         self.config.parser.modules.add("mod_ssl.c")
         self.config.parser.modules.add("socache_shmcb_module")
         tmp_path = os.path.realpath(tempfile.mkdtemp("vhostroot"))
-        os.chmod(tmp_path, 0o755)
+        filesystem.chmod(tmp_path, 0o755)
         mock_p = "certbot_apache.configurator.ApacheConfigurator._get_ssl_vhost_path"
         mock_a = "certbot_apache.parser.ApacheParser.add_include"