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From Robert Newson <>
Subject Re: Limiting doc size to prevent malicious use
Date Thu, 06 Sep 2012 20:33:29 GMT

Cloudant has a 64MB limit and we can control connection count on a per user basis. Lowering
max_document_size is a pretty good first step, but obviously not the only hardening mechanism
that should be employed for production use. This applies much wider than CouchDB, of course.


On 6 Sep 2012, at 21:12, Dan Santner wrote:

> Another vote for doing this at the web server where it belongs, closest to the edge of
your network.  If it gets all the way into an app server of any sort it's usually already
burned through your routers etc...
> Now that doesn't help someone who is on iris or cloudant but I suppose it would be in
those companies best interest to provide some sort of mechanism to throttle incoming post/put.
 I suppose they can charge you higher usage for the weakness but in the end it's never a good
thing to allow someone to go firehosing your sockets (intentional or not). 
> Sorry for the soapbox on my first post to this group, but real life production questions
like these are the main reason I can't run just a couch app and be done with it.  I treat
couch like a database in a three tier model.  It's brilliant for just that purpose alone.
> On Sep 6, 2012, at 2:31 PM, Mark Hahn wrote:
>> I am.  I couldn't live without nginx.  (And node and couchdb).
>> On Thu, Sep 6, 2012 at 12:27 PM, Dave Cottlehuber <> wrote:
>>> On 6 September 2012 20:50, Robert Newson <> wrote:
>>>> function(doc) {
>>>> if (JSON.stringify(doc).length > limit) {
>>>>   throw({forbidden : "doc too big"
>>>> }
>>>> }
>>>> With the caveat that this is inefficient and horrible.
>>>> B.
>>> And from a network-based (D)DOS, the damage is already done because it
>>> was sent & parsed muahahaha. But at least you'll not be storing that
>>> in the DB.
>>> Has anybody using nginx or apache to enforce a hard limit? e.g.
>>> A+
>>> Dave

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