Traversal Using Relays around NAT (TURN) Uniform Resource Identifiers
draft-petithuguenin-behave-turn-uri-bis-05

Abstract

This document defines two URI schemes that can be used to provision the configuration values needed by the resolution mechanism defined in [RFC5928].

Status of this Memo

This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79.

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This Internet-Draft will expire on May 03, 2012.

Copyright Notice

Copyright (c) 2011 IETF Trust and the persons identified as the document authors. All rights reserved.

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Table of Contents

• 1. Introduction
• 2. Syntax of a TURN or TURNS URI
• 3. Security Considerations
• 4. IANA Considerations
• 4.1. TURN URI Registration
• 4.2. TURNS URI Registration
• 5. Acknowledgements
• 6. References
• 6.1. Normative References
• 6.2. Informative References
• Appendix A. Release notes
• Appendix A.1. Modifications between petithuguenin-05 and petithuguenin-04
• Appendix A.2. Modifications between petithuguenin-04 and petithuguenin-03
• Appendix A.3. Modifications between petithuguenin-03 and petithuguenin-02
• Appendix A.4. Modifications between petithuguenin-02 and petithuguenin-01
• Appendix A.5. Modifications between petithuguenin-01 and petithuguenin-00
• Appendix A.6. Design Notes
• Appendix A.7. Running Code Considerations
• Appendix A.8. TODO List
• Author's Address

1. Introduction

[RFC5928] defines a resolution mechanism to convert a secure flag, an host name or IP address, a eventually empty port, and an eventually empty transport to a list of IP address, port, and TURN transport tuples.

To simplify the provisioning of TURN clients, this document defines a TURN and a TURNS URI scheme that can carry the four components needed for the resolution mechanism.

2. Syntax of a TURN or TURNS URI

A TURN/TURNS URI has the following ABNF syntax [RFC5234]:

turnURI       = scheme ":" turn-host [ ":" turn-port ]
              [ "?transport=" transport ]
scheme        = "turn" / "turns"
transport     = "udp" / "tcp" / transport-ext
transport-ext = 1*unreserved
turn-host     = IP-literal / IPv4address / reg-name
turn-port     = *DIGIT
IP-literal    = "[" ( IPv6address / IPvFuture  ) "]"
IPvFuture     = "v" 1*HEXDIG "." 1*( unreserved / sub-delims / ":" )
IPv6address   =                            6( h16 ":" ) ls32
              /                       "::" 5( h16 ":" ) ls32
              / [               h16 ] "::" 4( h16 ":" ) ls32
              / [ *1( h16 ":" ) h16 ] "::" 3( h16 ":" ) ls32
              / [ *2( h16 ":" ) h16 ] "::" 2( h16 ":" ) ls32
              / [ *3( h16 ":" ) h16 ] "::"    h16 ":"   ls32
              / [ *4( h16 ":" ) h16 ] "::"              ls32
              / [ *5( h16 ":" ) h16 ] "::"              h16
              / [ *6( h16 ":" ) h16 ] "::"
h16           = 1*4HEXDIG
ls32          = ( h16 ":" h16 ) / IPv4address
IPv4address   = dec-octet "." dec-octet "." dec-octet "." dec-octet
dec-octet     = DIGIT                 ; 0-9
              / %x31-39 DIGIT         ; 10-99
              / "1" 2DIGIT            ; 100-199
              / "2" %x30-34 DIGIT     ; 200-249
              / "25" %x30-35          ; 250-255
reg-name      = *( unreserved / pct-encoded / sub-delims )
				

<unreserved>, <sub-delims>, and <pct-encoded> are specified in [RFC3986].

<secure> is equal to false if <scheme> is equal to "turn" and equal to false if <scheme> is equal to "turns".

3. Security Considerations

Security considerations for the resolution mechanism are discussed in [RFC5928].

The "turn" and "turns" URI schemes do not introduce any specific security issues beyond the security considerations discussed in [RFC3986].

4. IANA Considerations

This section contains the registration information for the "turn" and "turns" URI Schemes (in accordance with [RFC4395]).

4.1. TURN URI Registration

URI scheme name: turn

Status: permanent

URI scheme syntax: See Section 2.

URI scheme semantics: See [RFC5928].

Encoding considerations: There are no encoding considerations beyond those in [RFC3986].

Applications/protocols that use this URI scheme name:

• The "turn" URI scheme is intended to be used by applications that might need access to a TURN server.

Interoperability considerations: N/A

Security considerations: See Section 3.

Contact: Marc Petit-Huguenin <petithug@acm.org>

Author/Change controller: The IESG

References: This document.

[Note to RFC Editor: Replace "This document" with reference to this document]

4.2. TURNS URI Registration

URI scheme name: turns

Status: permanent

URI scheme syntax: See Section 2.

URI scheme semantics: See [RFC5928].

Encoding considerations: There are no encoding considerations beyond those in [RFC3986].

Applications/protocols that use this URI scheme name:

• The "turns" URI scheme is intended to be used by applications that might need access to a TURN server.

Interoperability considerations: N/A

Security considerations: See Section 3.

Contact: Marc Petit-Huguenin <petithug@acm.org>

Author/Change controller: The IESG

References: This document.

[Note to RFC Editor: Replace "This document" with reference to this document]

5. Acknowledgements

Thanks to Margaret Wasserman, Magnus Westerlund, Juergen Schoenwaelder, Sean Turner, Ted Hardie, Dave Thaler, Alfred E. Heggestad, Eilon Yardeni, Dan Wing, Alfred Hoenes, and Jim Kleck for their comments, suggestions and questions that helped to improve this document.

The <turn-port> and <turn-host> ABNF productions have been copied from the <port> and <host> ABNF productions from [RFC3986].

This document was written with the xml2rfc tool described in [RFC2629].

6. References

6.1. Normative References

6.2. Informative References

Appendix A. Release notes

This section must be removed before publication as an RFC.

Appendix A.1. Modifications between petithuguenin-05 and petithuguenin-04

• Nits.
• Fixed schemes registration.

Appendix A.2. Modifications between petithuguenin-04 and petithuguenin-03

• Fixed references code link.

Appendix A.3. Modifications between petithuguenin-03 and petithuguenin-02

• Updated RFC references.

Appendix A.4. Modifications between petithuguenin-02 and petithuguenin-01

• Nits.

Appendix A.5. Modifications between petithuguenin-01 and petithuguenin-00

• Shorten I-D references.

Appendix A.6. Design Notes

• <password> is not used in the URIs because it is deprecated. <username> is not used in the URIs because it is not used to guide the resolution mechanism.
• As discussed in Dublin, there is no generic parameters in the URI to prevent compatibity issues.

Appendix A.7. Running Code Considerations

• Reference Implementation of TURN URI parser and resolver (<http://debian.implementers.org/turn-uri.tar.gz>). Marc Petit-Huguenin. Implements version -05.

Appendix A.8. TODO List

• Instead of using a transport parameter perhaps a scheme prefix, as proposed in [I-D.wood-tae-specifying-uri-transports] is better.
• Same thing for using a "+s" suffix instead of a "s" suffix for security.

Author's Address