The IESG has approved the following document: - 'X.509v3 TLS Feature Extension' (draft-hallambaker-tlsfeature-10.txt) as Proposed Standard This document has been reviewed in the IETF but is not the product of an IETF Working Group. The IESG contact person is Stephen Farrell. A URL of this Internet Draft is: https://datatracker.ietf.org/doc/draft-hallambaker-tlsfeature/ Technical Summary The purpose of the TLS feature extension is to prevent downgrade attacks that are not otherwise prevented by the TLS protocol. In particular, the TLS feature extension may be used to mandate support for revocation checking features in the TLS protocol such as OCSP stapling. Informing clients that an OCSP status response will always be stapled permits an immediate failure in the case that the response is not stapled. This in turn prevents a denial of service attack that might otherwise be possible. Working Group Summary This is not a WG document but has been discussed on the TLS list and (so I'm told) has support from browser implementers and other implementers. Document Quality The document is short and clear. I'm not clear on current implementation status but have been asked a number of times about it's status by implementers who want this. Personnel Sean Turner is the document shepherd. Stephen Farrell is the irresponsible AD. IANA Note Please note that up until the -09 version the draft had value 24 for what is documented as TBD2 in -10 for id-pe-tlsfeature. If IANA choose to allocate that value for this that might save some trouble for someone later. The value chosen for TBD1 doesn't matter at all.
