RFC 8744 on Issues and Requirements for Server Name Identification (SNI) Encryption in TLS

rfc-editor@rfc-editor.org Tue, 28 July 2020 21:57 UTC

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A new Request for Comments is now available in online RFC libraries.

        
        RFC 8744

        Title:      Issues and Requirements for Server 
                    Name Identification (SNI) Encryption in TLS 
        Author:     C. Huitema
        Status:     Informational
        Stream:     IETF
        Date:       July 2020
        Mailbox:    huitema@huitema.net
        Pages:      13
        Updates/Obsoletes/SeeAlso:   None

        I-D Tag:    draft-ietf-tls-sni-encryption-09.txt

        URL:        https://www.rfc-editor.org/info/rfc8744

        DOI:        10.17487/RFC8744

This document describes the general problem of encrypting the Server
Name Identification (SNI) TLS parameter. The proposed solutions hide
a hidden service behind a fronting service, only disclosing the SNI
of the fronting service to external observers. This document lists
known attacks against SNI encryption, discusses the current "HTTP
co-tenancy" solution, and presents requirements for future TLS-layer
solutions. 

In practice, it may well be that no solution can meet every
requirement and that practical solutions will have to make some
compromises.

This document is a product of the Transport Layer Security Working Group of the IETF.


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