Re: [http-state] [apps-discuss] HTTP MAC Authentication Scheme
Eran Hammer-Lahav <eran@hueniverse.com> Fri, 20 May 2011 21:18 UTC
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From: Eran Hammer-Lahav <eran@hueniverse.com>
To: Nico Williams <nico@cryptonector.com>
Date: Fri, 20 May 2011 14:18:21 -0700
Thread-Topic: [apps-discuss] HTTP MAC Authentication Scheme
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Cc: "apps-discuss@ietf.org" <apps-discuss@ietf.org>, Ben Adida <ben@adida.net>, "Adam Barth (adam@adambarth.com)" <adam@adambarth.com>, "http-state@ietf.org" <http-state@ietf.org>, HTTP Working Group <ietf-http-wg@w3.org>, OAuth WG <oauth@ietf.org>
Subject: Re: [http-state] [apps-discuss] HTTP MAC Authentication Scheme
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> -----Original Message----- > From: Nico Williams [mailto:nico@cryptonector.com] > Sent: Friday, May 20, 2011 1:25 PM > To: Eran Hammer-Lahav > Cc: apps-discuss@ietf.org; Ben Adida; http-state@ietf.org; OAuth WG; Adam > Barth (adam@adambarth.com); HTTP Working Group > Subject: Re: [apps-discuss] HTTP MAC Authentication Scheme > > Additional comments: > > - Using nonces for replay protection is heavy-duty. It is difficult to > implement a reliable, secure, high-performance replay cache. (It is easy to > implement just a high-performance replay cache: use > memcache.) > > I recommend an option to use sequence numbers at the server's choice, > understanding, of course, that requests will not be received in sequence. > The use of a sliding sequence number window makes it possible to do at > least as well as when using nonce, and probably faster while still being > secure. We switched to use time since credentials were issued. This should be pretty easy to implement if you really need reply protection by using a small window (clock sync is no longer a problem, just the delay in getting the credentials to the client, which should be a small window). > - In an open wifi environment active attacks may not be very difficult, thus > an option to secure more than just a handful of bits from the request, would > be nice (all of the request and all of the response, say). The hard part is how > to decide when to use one or the other. Ideally browsers can request more > protection when the network is reconfigured such that there's one or more > clear wifi interfaces. There is just no easy way to do that. If you need more, use TLS. EHL
- [http-state] HTTP MAC Authentication Scheme Eran Hammer-Lahav
- Re: [http-state] [apps-discuss] HTTP MAC Authenti… Nico Williams
- Re: [http-state] [apps-discuss] HTTP MAC Authenti… Eran Hammer-Lahav
- Re: [http-state] [apps-discuss] HTTP MAC Authenti… Nico Williams
- Re: [http-state] [apps-discuss] HTTP MAC Authenti… Mark Nottingham
- Re: [http-state] [apps-discuss] HTTP MAC Authenti… Eran Hammer-Lahav
- Re: [http-state] [apps-discuss] HTTP MAC Authenti… Stephen Farrell
- Re: [http-state] [apps-discuss] HTTP MAC Authenti… Mark Nottingham
- Re: [http-state] [apps-discuss] HTTP MAC Authenti… Adam Barth
- Re: [http-state] [apps-discuss] HTTP MAC Authenti… Eran Hammer-Lahav
- Re: [http-state] [apps-discuss] HTTP MAC Authenti… Mark Nottingham
- Re: [http-state] [apps-discuss] HTTP MAC Authenti… Stephen Farrell
- Re: [http-state] [apps-discuss] HTTP MAC Authenti… Dave CROCKER
- Re: [http-state] [apps-discuss] HTTP MAC Authenti… Paul E. Jones
- Re: [http-state] [apps-discuss] HTTP MAC Authenti… Nico Williams
- Re: [http-state] [apps-discuss] HTTP MAC Authenti… Adam Barth
- Re: [http-state] [apps-discuss] HTTP MAC Authenti… Nico Williams
- Re: [http-state] [OAUTH-WG] [apps-discuss] HTTP M… Nico Williams
- Re: [http-state] [apps-discuss] HTTP MAC Authenti… Adam Barth
- Re: [http-state] [apps-discuss] HTTP MAC Authenti… Paul E. Jones
- Re: [http-state] [apps-discuss] HTTP MAC Authenti… Nico Williams
- Re: [http-state] [apps-discuss] HTTP MAC Authenti… Nico Williams
- Re: [http-state] [OAUTH-WG] [apps-discuss] HTTP M… Nico Williams
- Re: [http-state] [OAUTH-WG] [apps-discuss] HTTP M… Nico Williams
- Re: [http-state] [OAUTH-WG] [apps-discuss] HTTP M… Nico Williams
- Re: [http-state] [OAUTH-WG] [apps-discuss] HTTP M… Nico Williams
- Re: [http-state] [OAUTH-WG] [apps-discuss] HTTP M… Nico Williams
- Re: [http-state] [apps-discuss] [OAUTH-WG] HTTP M… Mark Nottingham
- Re: [http-state] [apps-discuss] HTTP MAC Authenti… Paul E. Jones
- Re: [http-state] [apps-discuss] HTTP MAC Authenti… Nico Williams
- Re: [http-state] [apps-discuss] [OAUTH-WG] HTTP M… Nico Williams
- Re: [http-state] [apps-discuss] HTTP MAC Authenti… Paul E. Jones
- Re: [http-state] [apps-discuss] HTTP MAC Authenti… Paul E. Jones
- Re: [http-state] [OAUTH-WG] [apps-discuss] HTTP M… Igor Faynberg
- Re: [http-state] [OAUTH-WG] [apps-discuss] HTTP M… William J. Mills
- Re: [http-state] [OAUTH-WG] [apps-discuss] HTTP M… Randy Fischer
- Re: [http-state] [OAUTH-WG] [apps-discuss] HTTP M… William J. Mills
- Re: [http-state] [apps-discuss] [OAUTH-WG] HTTP M… Breno de Medeiros
- Re: [http-state] [OAUTH-WG] [apps-discuss] HTTP M… Tim
- Re: [http-state] [apps-discuss] HTTP MAC Authenti… Tim
- Re: [http-state] [apps-discuss] [OAUTH-WG] HTTP M… Bjartur Thorlacius
- Re: [http-state] [apps-discuss] HTTP MAC Authenti… Tim