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TOR users are legitimate users of the system; however, that system can also be used for abuse -- specifically, by evading IP-based rate-limiting. For the purposes of IP-based rate-limiting, add a RATE_LIMIT_TOR_TOGETHER flag, defaulting to false, which lumps all requests from TOR exit nodes into the same bucket. This may allow a TOR user to deny other TOR users access to the find-my-account and new-realm endpoints, but this is a low cost for cutting off a significant potential abuse vector. If enabled, the list of TOR exit nodes is fetched from their public endpoint once per hour, via a cron job, and cached on disk. Django processes load this data from disk, and cache it in memcached. Requests are spared from the burden of checking disk on failure via a circuitbreaker, which trips of there are two failures in a row, and only begins trying again after 10 minutes. |
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