Re: [TLS] Summarizing identity change discussion so far
Martin Rex <mrex@sap.com> Thu, 17 December 2009 23:47 UTC
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From: Martin Rex <mrex@sap.com>
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To: mrex@sap.com
Date: Fri, 18 Dec 2009 00:47:29 +0100
In-Reply-To: <200912172145.nBHLjDUT018568@fs4113.wdf.sap.corp> from "Martin Rex" at Dec 17, 9 10:45:13 pm
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Cc: tls@ietf.org
Subject: Re: [TLS] Summarizing identity change discussion so far
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Martin Rex wrote: > > Maybe we should at least mention one valid reason for why a certificate > may change in the Security Considerations: certificate update/renewal. > > There were two scenarios mentioned where this seems to be a > regular use case IIRC. Was it gaming where they were using quite > short-lived certificates and then XMPP, where they were using > quite long-lived connections? Thinking about the "valid reason" scenarios for certificate change, I'm slightly concerned about a potential disconnect between the original and the later certificates if the application designer is a little sloppy. If a design expects certificate renewal to be necessary (either short lived-certs or long-lived connections) then it is imperative that the application performs a full re-authentication when the identity changes during renegotiation. A simple certificate path validation could in some situations subvert a limited-time access restriction. Normally, you will need a specific certificate for initial authentication, because it is used for some kind of app-level logon-operation or ACL-check. When a renegotiation needs to be performed because of the expiration of the users cert, and the app does _not_ re-do the authentication logon/ACL-check, but relies blindly on the certificate path validation, then the user could simply use an entirely different certificate with a longer validity during renegotiation, succeed certificate path validation and keep using the resource beyond the expiration of the original access credential/certificate. -Martin
- [TLS] Summarizing identity change discussion so f… Pasi.Eronen
- Re: [TLS] Summarizing identity change discussion … Blumenthal, Uri - 0662 - MITLL
- Re: [TLS] Summarizing identity change discussion … Stephen Farrell
- Re: [TLS] Summarizing identity change discussion … Pasi.Eronen
- Re: [TLS] Summarizing identity change discussion … Eric Rescorla
- Re: [TLS] Summarizing identity change discussion … Marsh Ray
- Re: [TLS] Summarizing identity change discussion … Marsh Ray
- Re: [TLS] Summarizing identity change discussion … Martin Rex
- Re: [TLS] Summarizing identity change discussion … Stefan Santesson
- Re: [TLS] Summarizing identity change discussion … Pasi.Eronen
- Re: [TLS] Summarizing identity change discussion … Pasi.Eronen
- Re: [TLS] Summarizing identity change discussion … Martin Rex
- Re: [TLS] Summarizing identity change discussion … Michael Gray
- Re: [TLS] Summarizing identity change discussion … Marsh Ray
- Re: [TLS] Summarizing identity change discussion … Martin Rex
- Re: [TLS] Summarizing identity change discussion … Pasi.Eronen
- Re: [TLS] Summarizing identity change discussion … Pasi.Eronen
- Re: [TLS] Summarizing identity change discussion … Pasi.Eronen
- Re: [TLS] Summarizing identity change discussion … Marsh Ray
- Re: [TLS] Summarizing identity change discussion … Martin Rex
- Re: [TLS] Summarizing identity change discussion … Pasi.Eronen
- Re: [TLS] Summarizing identity change discussion … Pasi.Eronen
- Re: [TLS] Summarizing identity change discussion … Kyle Hamilton
- Re: [TLS] Summarizing identity change discussion … Martin Rex
- Re: [TLS] Summarizing identity change discussion … Marsh Ray
- Re: [TLS] Summarizing identity change discussion … Pasi.Eronen
- Re: [TLS] Summarizing identity change discussion … Michael Gray
- Re: [TLS] Summarizing identity change discussion … Martin Rex
- Re: [TLS] Summarizing identity change discussion … Michael Gray
- Re: [TLS] Summarizing identity change discussion … Marsh Ray
- Re: [TLS] Summarizing identity change discussion … Martin Rex
- Re: [TLS] Summarizing identity change discussion … Michael Gray
- Re: [TLS] Summarizing identity change discussion … Kyle Hamilton
- [TLS] OpenPGP Certs for TLS [was: Re: Summarizing… Daniel Kahn Gillmor
- Re: [TLS] Summarizing identity change discussion … Martin Rex
- Re: [TLS] Summarizing identity change discussion … Blumenthal, Uri - 0662 - MITLL
- Re: [TLS] Summarizing identity change discussion … Kyle Hamilton
- Re: [TLS] Summarizing identity change discussion … Martin Rex
- Re: [TLS] Summarizing identity change discussion … Kyle Hamilton
- Re: [TLS] Summarizing identity change discussion … Peter Saint-Andre
- Re: [TLS] Summarizing identity change discussion … Peter Saint-Andre
- Re: [TLS] Summarizing identity change discussion … Peter Saint-Andre
- Re: [TLS] Summarizing identity change discussion … Peter Saint-Andre
- Re: [TLS] Summarizing identity change discussion … David-Sarah Hopwood
- Re: [TLS] Summarizing identity change discussion … Blumenthal, Uri - 0662 - MITLL
- Re: [TLS] Summarizing identity change discussion … Marsh Ray
- Re: [TLS] Summarizing identity change discussion … Joseph Salowey (jsalowey)
- Re: [TLS] Summarizing identity change discussion … Stephen Farrell
- Re: [TLS] Summarizing identity change discussion … Martin Rex
- Re: [TLS] Summarizing identity change discussion … Nelson B Bolyard
- Re: [TLS] Summarizing identity change discussion … Nasko Oskov
- Re: [TLS] Summarizing identity change discussion … David-Sarah Hopwood
- Re: [TLS] Summarizing identity change discussion … David-Sarah Hopwood
- Re: [TLS] Summarizing identity change discussion … Joseph Salowey (jsalowey)
- Re: [TLS] Summarizing identity change discussion … Pasi.Eronen
- Re: [TLS] Summarizing identity change discussion … Joseph Salowey (jsalowey)