[jira] [Updated] (COUCHDB-1287) Inbox Database ("write-only" mode)

["Benoit Chesneau (Updated) (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/COUCHDB-1287?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Benoit Chesneau updated COUCHDB-1287:
-------------------------------------

    Attachment: 0001-handle-dropbox-db.-Add-dropbox-true-to-security-obje.patch

This is an alternative patch handle dropbox db:

Add dropbox: true to security object. Only admins and db admins can read docs. Anyone can post a doc. No test for now I will add it later today. It's already used in refuge. 

Here is how it works:

PUT  http://localhost:5984/_security -d'{"dropbox": true}'
-H'Content-Type: application/json'

test it :
curl -XPUT 'http://admin:test@127.0.0.1:5984/testdb/1' -d'{"a": 1}'
-H"Content-Type: application/json"

curl -XGET http://127.0.0.1:5984/testdb/1
{"error":"unauthorized","reason":"You are not a db or server admin."}

curl -XGET http://admin:test@127.0.0.1:5984/testdb/1
{"_id":"2","_rev":"1-3975759ccff3842adf690a5c10caee42","a":1}
---
 src/couch_mrview/src/couch_mrview_http.erl |    8 ++++-
 src/couchdb/couch_db.erl                   |   49 ++++++++++++++++++++++-----
 src/couchdb/couch_db.hrl                   |    3 +-
 3 files changed, 49 insertions(+), 11 deletions(-)
                
> Inbox Database ("write-only" mode)
> ----------------------------------
>
>                 Key: COUCHDB-1287
>                 URL: https://issues.apache.org/jira/browse/COUCHDB-1287
>             Project: CouchDB
>          Issue Type: New Feature
>          Components: HTTP Interface
>    Affects Versions: 1.2
>            Reporter: Jason Smith
>            Priority: Minor
>         Attachments: 0001-handle-dropbox-db.-Add-dropbox-true-to-security-obje.patch, A_0001-Refactor-reader_acl-test-functions-into-a-loop.patch, A_0002-Refactor-the-actual-read-check-out-of-the-member-che.patch, A_0003-Allow-non-member-writes-if-_security.members.allow_a.patch, B_0001-Refactor-reader_acl-test-functions-into-a-loop.patch, B_0002-Refactor-the-actual-read-check-out-of-the-member-che.patch, B_0003-Allow-non-member-updates-if-_security.members.allow_.patch
>
>
> Currently, we can only grant combined read+write access in the _security object "members" section. A user can either do both or neither. This prevents a very common requirement for couch apps: sending private information from less-privileged users to more-privileged users.
> There is no (reasonable) way to make an "inbox" where anybody may create a doc for me, but only I may read it. An inbox database allows user-to-user, or user-to-admin private messages. (Not only chat messages, but asynchronous notifications--with a per-user inbox, perhaps even service requests and responses.)
> There is no reason _security.members (formerly .readers) should control write access. validate_doc_update() functions do this better.
> I propose a boolean flag, _security.members.allow_anonymous_writes. If it is true, then CouchDB will allow document updates from non-members, giving validate_doc_update() the final word on accepting or rejecting the update.
> Requirements:
> 1. Everything about _security stays the same (backward-compatible)
> 2. If members.allow_anonymous_writes === true, then most PUT and POSTs may proceed
> 3. All updates are still subject to approval by all validate_doc_update functions, same as before.
> These are the known changes to the security model. I consider these all to be either very unlikely in practice, or worth the trade-off.
> * If you write to an inbox DB, you know, for a time, a subset of its documents (but that's the point)
> * An _update function could reveal a document to the user, with or without changing it. However, an admin must install such a misguided update function.
> * You can launch timing attacks to learn information about validate_doc_update
>   * You might discover whether doc IDs exist in the DB or not
>   * You might discover a well-known open source validation function. You can look for bugs in its source code.
> * Zero or more things which Jason can't think of

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