Re: [rtcweb] Security Architecture: SDES support is a MUST
Eric Rescorla <ekr@rtfm.com> Fri, 20 July 2012 13:50 UTC
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References: <201207190742.q6J7glf6008744@vivaldi29.register.it> <500834FE.5040809@alcatel-lucent.com> <500835E1.2070502@infosecurity.ch> <50084717.7060301@alcatel-lucent.com> <BLU169-DS1488EF1F32A1EB2027582093D90@phx.gbl> <5008F7B9.7020804@infosecurity.ch> <500957ED.90807@alvestrand.no> <50095AAC.7030104@infosecurity.ch> <50095CE7.6030202@alvestrand.no>
From: Eric Rescorla <ekr@rtfm.com>
Date: Fri, 20 Jul 2012 06:50:28 -0700
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To: Harald Alvestrand <harald@alvestrand.no>
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Subject: Re: [rtcweb] Security Architecture: SDES support is a MUST
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The draft currently states: * The "security characteristics" MUST include some mechanism to allow an out-of-band verification of the peer, such as a certificate fingerprint or an SAS. I'd be happy to have us specify a particular fingerprint algorithm (presumably SHA-256, potentially truncated) but I haven't seen any evidence that users savvy enough to inspect the fingerprint at all can't navigate more than one hash. For example, Chrome's SSL/TLS inspector currently displays MD5 and SHA-1. So I'm not sure something needs to be standardized here. -Ekr On Fri, Jul 20, 2012 at 6:28 AM, Harald Alvestrand <harald@alvestrand.no> wrote: > On 07/20/2012 03:18 PM, Fabio Pietrosanti (naif) wrote: >> >> On 7/20/12 3:06 PM, Harald Alvestrand wrote: >>>> >>>> Current security definition of WebRTC does not support end-to-end >>>> security. >>> >>> The current security definition of WebRTC (with DTLS) provides >>> fingerprints. >>> If the application is able to verify those fingerprints, security is end >>> to end; if it isn't - it isn't. >> >> The security specification already does specify how the fingerprint must >> be checked, against a third party system that must be trusted (unless >> there is some recent update i didn't still checked). >> >> The way the specification describe fingerprint must be checked, does not >> enforce end-to-end security but always rely on trusted third party, >> being IdP (identity providers). >> >> The only way to achieve end-to-end security is not to have any kind of >> trusted third party, as has been already discussed on >> http://www.ietf.org/mail-archive/web/rtcweb/current/msg04043.html . > > That link is your request to have SAS considered mandatory. > > I believe you got some support for that proposal, or at least some kind of > availability of digest information that can be verified independently, but I > do not believe that you got any support for having SAS be the one and only > definition of "end to end security". > > Thus, you may get support for your real request, but not for the language > you use to describe it. > >> >> Until WebRTC security architecture specification does not clearly define >> a peer-to-peer fingerprint verification system that does not rely on >> trusted third party it cannot be considered to provide end-to-end >> security. >> >> Fabio >> _______________________________________________ >> rtcweb mailing list >> rtcweb@ietf.org >> https://www.ietf.org/mailman/listinfo/rtcweb > > > _______________________________________________ > rtcweb mailing list > rtcweb@ietf.org > https://www.ietf.org/mailman/listinfo/rtcweb
- [rtcweb] Security Architecture: SDES support is a… Domenico Colella
- Re: [rtcweb] Security Architecture: SDES support … Igor Faynberg
- Re: [rtcweb] Security Architecture: SDES support … Fabio Pietrosanti (naif)
- Re: [rtcweb] Security Architecture: SDES support … Igor Faynberg
- Re: [rtcweb] Security Architecture: SDES support … Dan Wing
- Re: [rtcweb] Security Architecture: SDES support … Roman Shpount
- Re: [rtcweb] Security Architecture: SDES support … Bernard Aboba
- Re: [rtcweb] Security Architecture: SDES support … Dan Wing
- Re: [rtcweb] Security Architecture: SDES support … Fabio Pietrosanti (naif)
- Re: [rtcweb] Security Architecture: SDES support … Harald Alvestrand
- Re: [rtcweb] Security Architecture: SDES support … Fabio Pietrosanti (naif)
- Re: [rtcweb] Security Architecture: SDES support … Harald Alvestrand
- Re: [rtcweb] Security Architecture: SDES support … Eric Rescorla
- Re: [rtcweb] Security Architecture: SDES support … Dan Wing
- Re: [rtcweb] Security Architecture: SDES support … Alan Johnston
- Re: [rtcweb] Security Architecture: SDES support … domenico.colella