This one was actually pretty darn clever - nobody's abused it, but
I was reading a blog post where someone described this type of
issue, I realized it was a brilliant attack, and then realized
DTI was vulnerable. Oops. Thanks for the solution, Jamie!
http://jamie-wong.com/2012/08/22/what-i-did-at-khan-academy/#XSS+Fix
Many forms on the site contain a hidden authenticity_token field,
unique to each visitory. If a user submits a request with an
invalid authenticity_token, Rails assumes that it's a CSRF attempt
and logs out the user. So, if we happen to cache those forms with
authenticity_token fields, all users who use that form will have
the same authenticity_token (valid for only the first user who
saw the form, invalid for everyone else), and all requests made
through that form will log out the user. Bad news.
So, we stopped caching those forms. Yay!
Use the ImageMagick flatten command to generate the output all at
once instead of compositing each layer individually, and download
the layers in parallel. On my box, saving roopal27 five times took
a total of 30 seconds before, whereas now it takes 7 seconds. I
expect it to be even better on the production box, where latency
is even lower.
Sharing pane works, everything is great for guests. Logged in
users are on the way, since right now Share Outfit re-saves
anonymously rather than showing sharing data for the existing
outfit.
For example, the site was throwing a 500 error when loading pets
belonging to frozen users. Instead, we'll now rescue that
Neopets::User::AccountDisabledError and ignore it, since it's not
*vital* that we load gender/mood data from this pet; we can still
proceed to load its customization data without it.
The "Abominable Snowball Winter Onesie" can get blocked for including the string " On".
So, we meant to filter that to " O<b></b>n" so that the filter wouldn't return that false
positive on an XSS attempt, but were accidentally filtering it to " o<b></b&;gtn".
Fixed :)
So it turns out this was just one of those things I forgot to fix
the big database restructure came along: we were comparing
swf_asset.remote_id against parents_swf_assets.swf_asset_id, which
are two different identifiers entirely. Now using swf_asset.id,
so fixed :)
At first I thought this was an error in the data migration process when moving SWF assets
to having their own unique IDs, but then realized that the query for a pet state's SWFs
didn't include the (parent_type = 'Item') condition. Oops. Turns out, I only connected the
items to parent_swf_asset_relationships polymorphically. Pet states were still doing it the
hackish way. Set the pet states to use the lovely polymorphic relationship and we're good
to go.
After changing the database structure, we lost the feature where, once we discover
new assets for an item for a given body ID, we disconnect previously connected
assets. This commit reinstates that feature.
Due to a silly slip-up involving Javascript object literal syntax, we were
sending {csrf_param: "token"} instead of {authenticity_token: "token"} with
wardrobe AJAX requests. This would cause users to be auto-logged-out for
failing to provide a proper token. Oops.
Lots of scary bugs were being caused by the fact that the possibly-duplicate Neopets ID
was being treated as an SWF's real primary key, meaning that a save meant for object swf
number 123 could be saved to biology swf number 123. Which is awful.
This update gives SWFs their own unique internal ID numbers. All external lookups still use
the remote ID and the type, meaning that the client side remains totally unchanged (phew).
However, all database relationships with SWFs use the new ID numbers, making everything
cleaner. Yay.
There are probably a few places where it would be appropriate to optimize certain lookups
that still depend on remote ID and type. Whatever. Today's goal was to remove crazy
glitches that have been floating around like mad. And I think that goal has been met.
