X-Git-Url: https://sipb.mit.edu/gitweb.cgi/ikiwiki.git/blobdiff_plain/1bdad3513c40f60f75248dd7ac1ed7638ed1ed2a..93f970ea2f8018f778246b689b980360aea158fe:/doc/todo/__42__forward__42__ing_functionality_for_the_meta_plugin.mdwn

diff --git a/doc/todo/__42__forward__42__ing_functionality_for_the_meta_plugin.mdwn b/doc/todo/__42__forward__42__ing_functionality_for_the_meta_plugin.mdwn
index 30f9f7d0a..c3c2b82f3 100644
--- a/doc/todo/__42__forward__42__ing_functionality_for_the_meta_plugin.mdwn
+++ b/doc/todo/__42__forward__42__ing_functionality_for_the_meta_plugin.mdwn
@@ -28,9 +28,11 @@ I can also submit a Git patch, if desired.
 It might be doable to add references to pages that refer to the page containg
 the forwarding statement also to the referred-to page.
 
-
 --[[tschwinge]]
 
+
+# Discussion
+
 > The html scrubber cannot scrub meta headers. So if you emit one
 > containing user-supplied data, it's up to you to scrub it to avoid all
 > possible XSS attacks. Two attacks I'd worry about are cyclic meta refresh
@@ -46,3 +48,21 @@ the forwarding statement also to the referred-to page.
 >> What is a *cyclic meta refresh loop*?  Two pages in turn forwarding to each other?
 >> I think it would be possible to implement such a guard when only in-wiki links
 >> ([[wikilink]]s) are being used, but how to do so for external links?  --[[tschwinge]]
+
+>>> This seems a lot more securely to do for in-wiki links, since we know
+>>> that a link generated by a wikilink is safe, and can avoid cycles.
+>>> Obviously there's no way to avoid cycles when using external links.
+>>> 
+>>> An example of code that doesn't detect such cycles is LWP::UserAgent,
+>>> which will happily follow cycles forever. There's a LWPx::ParanoidAgent
+>>> that can deal with cycles. I suppose this could be considered a client
+>>> side issue, except that if I were going to turn this redirect feature
+>>> on in my wikis, I'd really prefer to not have to worry about my wiki
+>>> causing such problems for clients. I feel it makes sense to make
+>>> external redirects or other potentially unsafe things an option,
+>>> and have the default behavior be only things that are known to be
+>>> secure.
+>>>
+>>> I haven't checked if there's a way to embed javascript in meta refresh
+>>> links or not. Given all the other places I've seen it be embedded, I'll
+>>> assume it is possible until it's shown not to be though.. --[[Joey]]