Issue #2408321 by mfb, D34dMan, C_Logemann, serg2, walterebert, sanduhrs, John...

Issue #2408321 by mfb, D34dMan, C_Logemann, serg2, walterebert, sanduhrs, John Morahan: Support RFC 5785 by whitelisting the .well-known directory

.htaccess

@@ -3,7 +3,7 @@
 #
 
 # Protect files and directories from prying eyes.
-<FilesMatch "\.(engine|inc|install|make|module|profile|po|sh|.*sql|theme|twig|tpl(\.php)?|xtmpl|yml)(~|\.sw[op]|\.bak|\.orig|\.save)?$|^(\..*|Entries.*|Repository|Root|Tag|Template|composer\.(json|lock))$|^#.*#$|\.php(~|\.sw[op]|\.bak|\.orig|\.save)$">
+<FilesMatch "\.(engine|inc|install|make|module|profile|po|sh|.*sql|theme|twig|tpl(\.php)?|xtmpl|yml)(~|\.sw[op]|\.bak|\.orig|\.save)?$|^(\.(?!well-known).*|Entries.*|Repository|Root|Tag|Template|composer\.(json|lock))$|^#.*#$|\.php(~|\.sw[op]|\.bak|\.orig|\.save)$">
   <IfModule mod_authz_core.c>
     Require all denied
   </IfModule>
@@ -93,7 +93,7 @@ AddEncoding gzip svgz
   # If you do not have mod_rewrite installed, you should remove these
   # directories from your webroot or otherwise protect them from being
   # downloaded.
-  RewriteRule "(^|/)\." - [F]
+  RewriteRule "(^|/)\.(?!well-known)" - [F]
 
   # If your site can be accessed both with and without the 'www.' prefix, you
   # can use one of the following settings to redirect users to your preferred