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    <p>I've been doing more research and testing, and I want to summarize where I've gotten to, and what still isn't working for me.</p> <p>First off, apologies for those who read this question: I was looking for ways to set permissions for people to write, not read, the database. It turns out be be a big difference: the techniques for creating a "reader" are entirely different from creating a "writer" (that term actually doesn't exist, though I wonder why).</p> <p>In brief: you have to add a user to the _users database, which is a list of the users that have access to any database in your CouchDB instance. I was able to do that by issuing a command similar to:</p> <pre><code>curl -X PUT http://admin:password@localhost:5984/_users/org.couchdb.user:username -d '{"type":"user", "hashed_password":"2bf184a2d152aad139dc4facd7710ee848c2af27", "name":"username", "roles":[]}' </code></pre> <p>Note you need to apparently namespace the user name with the "org.couchdb.user" prefix. I used a Ruby hashing method to get the hashed_password value:</p> <pre><code>require 'digest/sha1' pass_hash = Digest::SHA1.hexdigest(password) </code></pre> <p>This gets an apparently valid user into the database. The next step is to assign that user as a "writer" (ha, there it is again!) for the new database that I created. So I might do something like:</p> <pre><code>curl -X PUT http://admin:password@localhost:5984/newdatabase </code></pre> <p>and then</p> <pre><code>curl -X PUT http://admin:password@localhost:5984/newdatabase/_design/security -d @security.json </code></pre> <p>That .json file contains a Javascript function for the "validate_doc_update" key, and that function looks like this:</p> <pre><code>function(new_doc, old_doc, userCtx) { if(userCtx.name != username) { throw({forbidden: "Please log in first."}); } } </code></pre> <p>It's roundabout, but it makes sense. However, I now am running into a problem: apparently the userCtx variable doesn't get populated until the user is authenticated. <a href="http://blog.couchone.com/post/1027100082/whats-new-in-couchdb-1-0-part-4-securityn-stuff" rel="noreferrer">This article</a> suggests that all you have to do is pass the credentials through an HTTP request to a special _session database, like so:</p> <pre><code>curl -X POST http://username:password@localhost:5984/_session </code></pre> <p>I can do that for my admin user, and the userCtx var will be populated. But for my newly-created user, it fails:</p> <pre><code>$ curl http://org.couchdb.user:username:password@localhost:5984/_session {"ok":true,"userCtx":{"name":null,"roles":[]},"info":{"authentication_db":"_users","authentication_handlers":["cookie","oauth","default"]}} </code></pre> <p>Note the userCtx hash is null. I wonder if that namespace thing is causing the problem? It's got a freakin' colon in it, so maybe there's some confusion about the password? I've tried making it without the namespace, and it doesn't work at all; at least here my request appears to be hitting the database and getting a response.</p> <p>I'm stuck at this point. If anyone can check my assumptions and progress thus far, I hope we can all figure out how to make this work.</p> <p>Thanks!</p> <p>Aaron.</p>
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    1. COIf you look at what the Futon login and logout control is doing, you'll see a generic way your users can log into your app. If you are accessing via curl, you can create users by signing up as them in Futon.
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    2. COYou don't need the "org.couchdb.user" prefix when authenticating, that's just added to the _id for storage in the _users db. Simply `curl http://username:password@localhost:5984/_session` and you should get a userCtx object.
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