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Re: passwords in subversion

From: Ben Collins-Sussman <sussman_at_collab.net>
Date: 2004-12-12 15:31:00 CET

On Dec 12, 2004, at 1:04 AM, Daniel Patterson wrote:

> Server stores HASH(pw)
> Client generates random token, and calculates this:
> authstring = HASH(HASH(pw)+token)

IIRC, svnserve is doing CRAM-MD5 right now, which is *almost* the same

      authstring = HASH(pw + token).

> Client sends "authstring,token" to server. Server can recalculate
> authstring to verify that the client knew "pw" (or at least,
> HASH(pw)). Neither "pw", nor "HASH(pw)" are ever sent over the
> wire.

And in CRAM-MD5, the server stores cleartext "pw", so it knows that the
client knew "pw". Just like digest auth, the password never travels
over the network in the clear.

> If someone can get copies of the hash, then you're still screwed
> (the hash is basically the password), but hopefully, hashes are
> harder
> for people to remember by looking over your shoulder.

Agreed. But rather than implement a whole new (almost identical) authn
system, why not just have svnserve store the user-db with a trivial
scramble. It solves the same "over the shoulder" problem, with a lot
less work.

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Received on Sun Dec 12 15:35:14 2004

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