Re: [TLS] TLS 1.3 draft-07 sneak peek
Karthikeyan Bhargavan <karthik.bhargavan@gmail.com> Tue, 07 July 2015 14:54 UTC
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From: Karthikeyan Bhargavan <karthik.bhargavan@gmail.com>
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Date: Tue, 07 Jul 2015 10:54:09 -0400
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References: <CABcZeBOWK_WnHAefsZUBr4UyEkyiZqi1mhoZH8ZeGFftdOqTTw@mail.gmail.com> <201507031907.13872.davemgarrett@gmail.com> <CABcZeBOvNMXESnv1pJRj39sPwsUnR=UW1r0TQK5uJPeuHLa+sg@mail.gmail.com> <201507031925.04809.davemgarrett@gmail.com> <20150707143431.GA853@LK-Perkele-VII>
To: Ilari Liusvaara <ilari.liusvaara@elisanet.fi>
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Subject: Re: [TLS] TLS 1.3 draft-07 sneak peek
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Putting aside the timeline for retiring SHA-1 from certificates, which will happen sooner than later, I think we should ban MD5 and SHA1 from client and server signatures in TLS 1.3. Recent events show that TLS servers get updated too slowly to hope for graceful deprecation. Using the version change to remove these (like we removed RSA encryption and RC4) would be right thing to do -Karthik > On 07 Jul 2015, at 10:34, Ilari Liusvaara <ilari.liusvaara@elisanet.fi> wrote: > > On Fri, Jul 03, 2015 at 07:25:04PM -0400, Dave Garrett wrote: >> On Friday, July 03, 2015 07:13:15 pm Eric Rescorla wrote: >>> I think we probably need to have WG consensus for the SHA-1 thing. >> >> Yes, that's why I left it out of that changeset. I don't think the >> topic of what to do in the TLS 1.3 spec with SHA1 has been discussed >> on this list. (if it has, please point me to the thread if someone >> can) >> >> The simplest thing would be to have a MUST NOT offer or negotiate >> in 2017 or later and a NOT RECOMMENDED to use until then. Or, we >> could go deeper into the weeds and talk about expiration dates. >> Banning it totally for TLS 1.3+ is also an option, but probably not >> wanted yet. > > No, the simplest thing would be to ban it entierely: > - MUST ignore entries with MD5 or SHA1 hash in > supported_signature_algorithms, even if those are the only > ones (which will cause handshake failure). > - MUST terminate connection with insufficient_security if MD5 or > SHA1 is seen in DigitallySigned.algorithm. > > SHA-1 is known to be seriously broken. That is way more than > enough reason to completely remove it. Especially from new > standards. > > > If one wants those to also apply to TLS 1.2, plus: > - MUST send signature_algorithms extension in TLS 1.2+, > server MUST terminate connections without it. > - MUST NOT send MD5 or SHA1 entries in > supported_signature_algorithms. > > Effective immeidately for MD5, and in 1.1.2017 for SHA1 > (including signature_algorithms) is separate matter > (and separate draft). > > > > -Ilari > > _______________________________________________ > TLS mailing list > TLS@ietf.org > https://www.ietf.org/mailman/listinfo/tls
- [TLS] TLS 1.3 draft-07 sneak peek Eric Rescorla
- Re: [TLS] TLS 1.3 draft-07 sneak peek Eric Rescorla
- Re: [TLS] TLS 1.3 draft-07 sneak peek Dave Garrett
- Re: [TLS] TLS 1.3 draft-07 sneak peek Eric Rescorla
- Re: [TLS] TLS 1.3 draft-07 sneak peek Ilari Liusvaara
- Re: [TLS] TLS 1.3 draft-07 sneak peek Ilari Liusvaara
- Re: [TLS] TLS 1.3 draft-07 sneak peek Eric Rescorla
- Re: [TLS] TLS 1.3 draft-07 sneak peek Ilari Liusvaara
- Re: [TLS] TLS 1.3 draft-07 sneak peek Hanno Böck
- Re: [TLS] TLS 1.3 draft-07 sneak peek Eric Rescorla
- Re: [TLS] TLS 1.3 draft-07 sneak peek Dave Garrett
- Re: [TLS] TLS 1.3 draft-07 sneak peek Hubert Kario
- Re: [TLS] TLS 1.3 draft-07 sneak peek Eric Rescorla
- Re: [TLS] TLS 1.3 draft-07 sneak peek Dave Garrett
- Re: [TLS] TLS 1.3 draft-07 sneak peek Hubert Kario
- Re: [TLS] TLS 1.3 draft-07 sneak peek Hubert Kario
- Re: [TLS] TLS 1.3 draft-07 sneak peek Dave Garrett
- Re: [TLS] TLS 1.3 draft-07 sneak peek Martin Rex
- Re: [TLS] TLS 1.3 draft-07 sneak peek Martin Thomson
- Re: [TLS] TLS 1.3 draft-07 sneak peek Hubert Kario
- Re: [TLS] TLS 1.3 draft-07 sneak peek Dave Garrett
- Re: [TLS] TLS 1.3 draft-07 sneak peek Eric Rescorla
- Re: [TLS] TLS 1.3 draft-07 sneak peek Dave Garrett
- Re: [TLS] TLS 1.3 draft-07 sneak peek Martin Rex
- Re: [TLS] TLS 1.3 draft-07 sneak peek Quynh Dang
- Re: [TLS] TLS 1.3 draft-07 sneak peek Martin Rex
- Re: [TLS] TLS 1.3 draft-07 sneak peek Martin Rex
- Re: [TLS] TLS 1.3 draft-07 sneak peek Watson Ladd
- Re: [TLS] TLS 1.3 draft-07 sneak peek Dang, Quynh
- Re: [TLS] TLS 1.3 draft-07 sneak peek Quynh Dang
- [TLS] MTI Extensions (was Re: TLS 1.3 draft-07 sn… Dave Garrett
- Re: [TLS] TLS 1.3 draft-07 sneak peek William Whyte
- Re: [TLS] TLS 1.3 draft-07 sneak peek Dang, Quynh
- Re: [TLS] TLS 1.3 draft-07 sneak peek Hanno Böck
- Re: [TLS] TLS 1.3 draft-07 sneak peek Jeffrey Walton
- Re: [TLS] TLS 1.3 draft-07 sneak peek Peter Gutmann
- Re: [TLS] TLS 1.3 draft-07 sneak peek Dang, Quynh
- Re: [TLS] TLS 1.3 draft-07 sneak peek Martin Rex
- Re: [TLS] TLS 1.3 draft-07 sneak peek Martin Rex
- Re: [TLS] TLS 1.3 draft-07 sneak peek Ilari Liusvaara
- Re: [TLS] TLS 1.3 draft-07 sneak peek Karthikeyan Bhargavan
- Re: [TLS] TLS 1.3 draft-07 sneak peek Dave Garrett
- Re: [TLS] TLS 1.3 draft-07 sneak peek Salz, Rich
- [TLS] Deprecate SHA1 for signatures in TLS 1.3 (w… Dave Garrett
- Re: [TLS] TLS 1.3 draft-07 sneak peek Eric Rescorla
- Re: [TLS] TLS 1.3 draft-07 sneak peek Dave Garrett
- Re: [TLS] TLS 1.3 draft-07 sneak peek Eric Rescorla
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Eric Rescorla
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Salz, Rich
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Karthikeyan Bhargavan
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Ilari Liusvaara
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Dave Garrett
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Dave Garrett
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Eric Rescorla
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Dave Garrett
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Viktor Dukhovni
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Martin Thomson
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Salz, Rich
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Martin Thomson
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Blumenthal, Uri - 0553 - MITLL
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Blumenthal, Uri - 0553 - MITLL
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Salz, Rich
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Blumenthal, Uri - 0553 - MITLL
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Martin Thomson
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Martin Rex
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Martin Rex
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Dave Garrett
- Re: [TLS] TLS 1.3 draft-07 sneak peek Hubert Kario
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Yoav Nir
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Andrei Popov
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Hubert Kario
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Viktor Dukhovni
- Re: [TLS] TLS 1.3 draft-07 sneak peek Jeffrey Walton
- Re: [TLS] TLS 1.3 draft-07 sneak peek Jeffrey Walton
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Dave Garrett
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Yoav Nir
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Viktor Dukhovni
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Hubert Kario
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Henrik Grubbström
- Re: [TLS] TLS 1.3 draft-07 sneak peek Salz, Rich
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Martin Rex
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Watson Ladd
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Viktor Dukhovni
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Dave Garrett
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Martin Rex
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Viktor Dukhovni
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Dave Garrett
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Viktor Dukhovni
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Martin Rex
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Viktor Dukhovni
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Dave Garrett
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Andrei Popov
- [TLS] Explicit error expectations (was Re: Deprec… Dave Garrett
- Re: [TLS] Explicit error expectations (was Re: De… Viktor Dukhovni
- Re: [TLS] Explicit error expectations (was Re: De… Dave Garrett
- Re: [TLS] Explicit error expectations (was Re: De… Ilari Liusvaara
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Eric Rescorla
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Ilari Liusvaara
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Eric Rescorla
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Viktor Dukhovni
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Dave Garrett
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Viktor Dukhovni
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Dave Garrett
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Dave Garrett
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Viktor Dukhovni
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Viktor Dukhovni
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Eric Rescorla
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Viktor Dukhovni
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Dave Garrett
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Viktor Dukhovni
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Ilari Liusvaara
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Dave Garrett
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Eric Rescorla
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Eric Rescorla
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Dave Garrett
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Andrei Popov
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Viktor Dukhovni
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Martin Rex
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Henrik Grubbström
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Martin Rex
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Viktor Dukhovni
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Dave Garrett
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Martin Rex
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Ilari Liusvaara
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Eric Rescorla
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Martin Rex
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Andrei Popov
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Martin Rex
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Viktor Dukhovni
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Blumenthal, Uri - 0553 - MITLL
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Dave Garrett
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Andrei Popov
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Martin Rex
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Viktor Dukhovni
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Andrei Popov
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Martin Rex
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Viktor Dukhovni
- [TLS] DANE & TLS 1.3 (was Re: Deprecate SHA1 for … Dave Garrett
- Re: [TLS] DANE & TLS 1.3 (was Re: Deprecate SHA1 … Viktor Dukhovni
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Hubert Kario
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Martin Rex
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Viktor Dukhovni
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Viktor Dukhovni
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Andrei Popov
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Martin Thomson
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Andrei Popov
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Viktor Dukhovni
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Viktor Dukhovni
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Martin Thomson
- Re: [TLS] Deprecate SHA1 for signatures in TLS 1.… Viktor Dukhovni