Date: Tue, 01 May 2012 13:03:56 +0200 From: Florian Weimer <fw@...eb.enyo.de> To: oss-security@...ts.openwall.com Subject: Re: weak use of crypto in python-elixir can lead to information disclosure (CVE and peer review request) * Florian Weimer: > * Vincent Danen: > >>>And you can group by encrypted column values in the database. That's >>>why I'm not sure if it's actually possible to address this issue in a >>>satisfying manner. >> >> So the encryption can be more fine-grained than just per-table? You can >> also do it per-column? If that's the case, this does sound a lot uglier >> to deal with. > > This test case suggests to me that you have to specify the list of > encrypted columns explicitly: > > <http://elixir.ematia.de/trac/browser/elixir/trunk/tests/test_encryption.py> > > Based on this example, it's not clear to me if the current > implementation supports get_by with an encrypted column. If this is a > feature which needs preserving, there is no apparent way around > convergent encryption. So it turns out that this passes the assert: p = Person.get_by(password='r\\x9d\\xa8\\xb4\\x8d|\\xffp\\xf5\\x0e') assert p.name == 'Jonathan LaCour' But this fails because p is None: p = Person.get_by(ssn='123-45-6789') assert p.name == 'Jonathan LaCour' This suggests to me that get_by on an encrypted column is not actually supported. The documentation doesn't describe which queries are supported: <http://elixir.ematia.de/apidocs/elixir.ext.encrypted.html>
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