Application-Layer Protocol Negotiation (ALPN) Labels for Session Traversal Utilities for NAT (STUN) Usages
RFC 7443
| Document | Type |
RFC - Informational
(January 2015; No errata)
Was draft-ietf-tram-alpn (tram WG)
|
|
|---|---|---|---|
| Last updated | 2015-10-14 | ||
| Stream | IETF | ||
| Formats | plain text pdf htmlized bibtex | ||
| Reviews | |||
| Stream | WG state | Submitted to IESG for Publication | |
| Document shepherd | Simon Perreault | ||
| Shepherd write-up | Show (last changed 2014-10-07) | ||
| IESG | IESG state | RFC 7443 (Informational) | |
| Consensus Boilerplate | Yes | ||
| Telechat date | |||
| Responsible AD | Spencer Dawkins | ||
| Send notices to | (None) | ||
| IANA | IANA review state | Version Changed - Review Needed | |
| IANA action state | RFC-Ed-Ack | ||
Internet Engineering Task Force (IETF) P. Patil
Request for Comments: 7443 T. Reddy
Category: Informational G. Salgueiro
ISSN: 2070-1721 Cisco
M. Petit-Huguenin
Impedance Mismatch
January 2015
Application-Layer Protocol Negotiation (ALPN) Labels
for Session Traversal Utilities for NAT (STUN) Usages
Abstract
Application-Layer Protocol Negotiation (ALPN) labels for Session
Traversal Utilities for NAT (STUN) usages, such as Traversal Using
Relays around NAT (TURN) and NAT discovery, are defined in this
document to allow an application layer to negotiate STUN usages
within the Transport Layer Security (TLS) connection. ALPN protocol
identifiers defined in this document apply to both TLS and Datagram
Transport Layer Security (DTLS).
Status of This Memo
This document is not an Internet Standards Track specification; it is
published for informational purposes.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Not all documents
approved by the IESG are a candidate for any level of Internet
Standard; see Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc7443.
Patil, et al. Informational [Page 1]
RFC 7443 ALPN for STUN/TURN January 2015
Copyright Notice
Copyright (c) 2015 IETF Trust and the persons identified as the
document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of
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the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 3
3. Security Considerations . . . . . . . . . . . . . . . . . . . 3
4. References . . . . . . . . . . . . . . . . . . . . . . . . . 4
4.1. Normative References . . . . . . . . . . . . . . . . . . 4
4.2. Informative References . . . . . . . . . . . . . . . . . 4
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 4
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 5
1. Introduction
STUN can be securely transported using TLS-over-TCP (referred to as
TLS [RFC5246]), as specified in [RFC5389], or TLS-over-UDP (referred
to as DTLS [RFC6347]), as specified in [RFC7350].
ALPN [RFC7301] enables an endpoint to positively identify an
application protocol in TLS/DTLS and distinguish it from other TLS/
DTLS protocols. With ALPN, the client sends the list of supported
application protocols as part of the TLS/DTLS ClientHello message.
The server chooses a protocol and sends the selected protocol as part
of the TLS/DTLS ServerHello message. Application protocol
negotiation can thus be accomplished within the TLS/DTLS handshake,
without adding network round-trips.
STUN protocol usages, such as TURN [RFC5766], can be used to identify
the purpose of a flow without initiating a session.
This document proposes the following ALPN labels to identify STUN
protocol [RFC5389] usages.
Patil, et al. Informational [Page 2]
RFC 7443 ALPN for STUN/TURN January 2015
'stun.turn': Label to identify the specific use of STUN over (D)TLS
for TURN (Section 4.6 of [RFC7350]).
'stun.nat-discovery': Label to identify the specific use of STUN
over (D)TLS for NAT discovery (Section 4.1 of [RFC7350]).
2. IANA Considerations
The following entries have been added to the "Application-Layer
Protocol Negotiation (ALPN) Protocol IDs" registry established by
[RFC7301].
The "stun.turn" label identifies the use of TURN usage (D)TLS:
Protocol: Traversal Using Relays around NAT (TURN)
Identification Sequence: 0x73 0x74 0x75 0x6E 0x2E 0x74 0x75 0x72
0x6E ("stun.turn")
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