Add unit tests for windows directory permission setting

monkey/tests/unit_tests/monkey_island/cc/environment/test_windows_permissions.py

@@ -0,0 +1,34 @@
+import os
+
+import pytest
+
+from monkey_island.cc.environment.windows_permissions import set_perms_to_owner_only
+
+
+@pytest.mark.skipif(os.name == "posix", reason="Tests Windows (not Posix) permissions.")
+def test_set_perms_to_owner_only(tmpdir):
+    import win32api  # noqa: E402
+    import win32security  # noqa: E402
+
+    folder = str(tmpdir)
+
+    set_perms_to_owner_only(folder)
+
+    FULL_CONTROL = 2032127
+    ACE_TYPE_ALLOW = 0
+
+    user_sid, _, _ = win32security.LookupAccountName("", win32api.GetUserName())
+    security_descriptor = win32security.GetNamedSecurityInfo(
+        folder, win32security.SE_FILE_OBJECT, win32security.DACL_SECURITY_INFORMATION
+    )
+    acl = security_descriptor.GetSecurityDescriptorDacl()
+
+    assert acl.GetAceCount() == 1
+
+    ace = acl.GetAce(0)
+    ace_type, _ = ace[0]  # 0 for allow, 1 for deny
+    permissions = ace[1]
+    sid = ace[-1]
+
+    assert sid == user_sid
+    assert permissions == FULL_CONTROL and ace_type == ACE_TYPE_ALLOW