Re: [TLS] Update spec to match current practices for certificate chain order
Viktor Dukhovni <ietf-dane@dukhovni.org> Thu, 07 May 2015 20:18 UTC
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From: Viktor Dukhovni <ietf-dane@dukhovni.org>
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Subject: Re: [TLS] Update spec to match current practices for certificate chain order
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On Thu, May 07, 2015 at 02:35:15PM -0400, Dave Garrett wrote: > Current: https://tools.ietf.org/html/rfc5246#section-7.4.2 > > certificate_list requirements draft 3a: > ------------------------------------------------------------ > certificate_list > This is a list of certificates needed for authentication. > The sender's certificate MUST come first in the list. > Additional certificates needed to construct a valid certificate > chain SHOULD be ordered by increasing scope of authority. > (e.g. sender, intermediate(s), certificate authority) > Root certificate authority certificates MAY be omitted from > this list under the assumption that the peer possesses it > in its trust store. > ------------------------------------------------------------ That's mostly fine (singular/plural conflict), though one might clarify the MAY further: certificate_list This is a list of certificates needed for authentication. The sender's certificate MUST come first in the list. Additional certificates needed to construct a valid certificate chain SHOULD be ordered by increasing scope of authority. (e.g. sender, intermediate(s), certificate authority). Root certificate authority certificates MAY be omitted from the list, provided supported peers are known to possesses any omitted certificates they may require in their trust stores. (When DANE-TA(2) trust-anchors are self-signed roots, they MUST not be omitted [draft-ietf-dane-ops]). Note, [draft-ietf-dane-ops] will be an RFC long before TLS 1.3 is done. > certificate_list requirements draft 3b: > ------------------------------------------------------------ > certificate_list > This is a list of certificates needed for authentication. > The sender's certificate MUST come first in the list. > Additional certificates needed to construct a valid certificate > chain SHOULD be ordered by increasing scope of authority. > (e.g. sender, intermediate(s), certificate authority) > It is NOT RECOMMENDED to include root certificates that > peers must already possess in order to validate the > given chain. > ------------------------------------------------------------ I think, that's still too strong. Note that often the chain construction is done by a library that augments the server leaf certificate with additional certificaets from the server's trust store, and this code does not know whether the root is needed in the chain or not. -- Viktor.
- [TLS] Update spec to match current practices for … Dave Garrett
- Re: [TLS] Update spec to match current practices … Yoav Nir
- Re: [TLS] Update spec to match current practices … Peter Gutmann
- Re: [TLS] Update spec to match current practices … Viktor Dukhovni
- Re: [TLS] Update spec to match current practices … Dave Garrett
- Re: [TLS] Update spec to match current practices … Martin Rex
- Re: [TLS] Update spec to match current practices … Martin Rex
- Re: [TLS] Update spec to match current practices … Peter Gutmann
- Re: [TLS] Update spec to match current practices … Martin Rex
- Re: [TLS] Update spec to match current practices … Peter Gutmann
- Re: [TLS] Update spec to match current practices … Viktor Dukhovni
- Re: [TLS] Update spec to match current practices … Ryan Sleevi
- Re: [TLS] Update spec to match current practices … Martin Rex
- Re: [TLS] Update spec to match current practices … Dave Garrett
- Re: [TLS] Update spec to match current practices … Fabrice Gautier
- Re: [TLS] Update spec to match current practices … Viktor Dukhovni
- Re: [TLS] Update spec to match current practices … Ryan Sleevi
- Re: [TLS] Update spec to match current practices … Viktor Dukhovni
- Re: [TLS] Update spec to match current practices … Geoffrey Keating
- Re: [TLS] Update spec to match current practices … Dave Garrett
- Re: [TLS] Update spec to match current practices … Ryan Sleevi
- Re: [TLS] Update spec to match current practices … Ben Laurie
- Re: [TLS] Update spec to match current practices … Martin Rex
- Re: [TLS] Update spec to match current practices … Kemp, David P.
- Re: [TLS] Update spec to match current practices … Martin Rex
- Re: [TLS] Update spec to match current practices … Kemp, David P.
- Re: [TLS] Update spec to match current practices … Dave Garrett
- Re: [TLS] Update spec to match current practices … Martin Rex
- Re: [TLS] Update spec to match current practices … Martin Rex
- Re: [TLS] Update spec to match current practices … Martin Rex
- Re: [TLS] Update spec to match current practices … Geoff Keating
- Re: [TLS] Update spec to match current practices … Ryan Sleevi
- Re: [TLS] Update spec to match current practices … Dave Garrett
- Re: [TLS] Update spec to match current practices … Ryan Sleevi
- Re: [TLS] Update spec to match current practices … Dave Garrett
- Re: [TLS] Update spec to match current practices … Dave Garrett
- Re: [TLS] Update spec to match current practices … Martin Rex
- Re: [TLS] Update spec to match current practices … Salz, Rich
- Re: [TLS] Update spec to match current practices … Ryan Sleevi
- Re: [TLS] Update spec to match current practices … Dave Garrett
- Re: [TLS] Update spec to match current practices … Viktor Dukhovni
- Re: [TLS] Update spec to match current practices … Peter Gutmann
- Re: [TLS] Update spec to match current practices … Peter Gutmann
- Re: [TLS] Update spec to match current practices … Ben Laurie
- Re: [TLS] Update spec to match current practices … Martin Rex
- Re: [TLS] Update spec to match current practices … Peter Gutmann
- Re: [TLS] Update spec to match current practices … Viktor Dukhovni
- Re: [TLS] Update spec to match current practices … Ilari Liusvaara
- Re: [TLS] Update spec to match current practices … Martin Rex
- Re: [TLS] Update spec to match current practices … Viktor Dukhovni
- Re: [TLS] Update spec to match current practices … Watson Ladd
- Re: [TLS] Update spec to match current practices … Viktor Dukhovni
- Re: [TLS] Update spec to match current practices … Ryan Sleevi
- Re: [TLS] Update spec to match current practices … Martin Rex
- Re: [TLS] Update spec to match current practices … Martin Rex
- Re: [TLS] Update spec to match current practices … Ryan Sleevi
- Re: [TLS] Update spec to match current practices … Martin Rex
- Re: [TLS] Update spec to match current practices … Ryan Sleevi
- Re: [TLS] Update spec to match current practices … Martin Rex
- Re: [TLS] Update spec to match current practices … Ryan Sleevi