One document matched: draft-jennings-sip-dtls-04.txt
Differences from draft-jennings-sip-dtls-03.txt
Network Working Group C. Jennings
Internet-Draft Cisco Systems
Intended status: Standards Track N. Modadugu
Expires: December 4, 2007 Stanford University
June 2, 2007
Session Initiation Protocol (SIP) over Datagram Transport Layer Security
(DTLS)
draft-jennings-sip-dtls-04
Status of this Memo
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Copyright Notice
Copyright (C) The IETF Trust (2007).
Abstract
This specification defines how to use Datagram Transport Layer
Security (DTLS) as a transport for Session Initiation Protocol (SIP).
DTLS is a protocol for providing Transport Layer Security (TLS)
security over a datagram protocol. This specification also specifies
the IANA registrations for using SIP with Datagram Congestion Control
Protocol (DCCP).
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1. Introduction
Datagram Transport Layer Security (DTLS) [2] provides communication
privacy similar to TLS [1] for datagram packets. SIP can run over
both stream and datagram transports, including UDP and TCP. SIP [4]
already defines how to use TLS with stream oriented transports. This
specification extends SIP to use DTLS with datagram oriented
transports.
2. Terminology
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in RFC 2119 [5].
3. Transport Parameters
Via header fields in SIP carry a transport protocol identifier. This
specification extends RFC 3261 to define the value "DTLS-UDP" for
DTLS over UDP and "DTLS-DCCP" for DTLS over DCCP. The update to the
ABNF[3] in RFC 3261 for this parameter is the following:
transport =/ "DTLS-DCCP" / "DTLS-UDP"
The following is an example Via header field:
Via: SIP/2.0/DTLS-UDP atlanta.example.com:5060
4. DTLS Usage
The normal rules for sending a request over UDP in RFC 3261 apply to
sending over DTLS. Note that the congestion safety rules for UDP do
not apply to DCCP. In addition, the normal rules for validating a
TLS connection in RFC 3261 apply to DTLS connections. Requests with
a SIPS URI can be sent over DTLS as well as TLS.
5. Locating DTLS SIP Servers
The normal rules from RFC 3263 [6] apply when locating a SIP server
that supports DTLS. The following new NAPTR[7] service values are
defined: "SIPS+D2U" for UDP, and "SIPS+D2D" for DCCP[8]. In
addition, the service value "SIP+D2D" should be used for SIP without
DTLS over DCCP.
The default port for DTLS over UDP or DCCP is 5061.
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6. Security Considerations
The security issues with SIP using DTLS are equivalent to the issues
of using SIP with TLS. All the security considerations in RFC 3261
relevant to TLS apply to DTLS.
7. IANA Considerations
This document defines new NAPTR service field values for DTLS over
DCCP and UDP as well as over DCCP with no DTLS. IANA is requested to
register these values under the "Registry for the SIP SRV Resource
Record Services Field". The resulting entries should be:
Services Field Protocol Reference
-------------------- -------- ---------
SIPS+D2U UDP [RFCXXXX]
SIPS+D2D DCCP [RFCXXXX]
SIP+D2D DCCP [RFCXXXX]
[Note to RFC Editor: Please replace XXXX with the RFC number of this
specification.]
8. Acknowledgments
Much of text and outline for this specification came from RFC 4168
authored by Jonathan Rosenberg, Henning Schulzrinne, and Gonzalo
Camarillo. Jakob Schlyter caught several typos. Eric Rescorla
provided helpful comments and text.
9. Normative References
[1] Dierks, T. and C. Allen, "The TLS Protocol Version 1.0",
RFC 2246, January 1999.
[2] Rescorla, E. and N. Modadugu, "Datagram Transport Layer
Security", RFC 4347, April 2006.
[3] Crocker, D. and P. Overell, "Augmented BNF for Syntax
Specifications: ABNF", RFC 4234, October 2005.
[4] Rosenberg, J., Schulzrinne, H., Camarillo, G., Johnston, A.,
Peterson, J., Sparks, R., Handley, M., and E. Schooler, "SIP:
Session Initiation Protocol", RFC 3261, June 2002.
[5] Bradner, S., "Key words for use in RFCs to Indicate Requirement
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Levels", BCP 14, RFC 2119, March 1997.
[6] Rosenberg, J. and H. Schulzrinne, "Session Initiation Protocol
(SIP): Locating SIP Servers", RFC 3263, June 2002.
[7] Mealling, M., "Dynamic Delegation Discovery System (DDDS) Part
Three: The Domain Name System (DNS) Database", RFC 3403,
October 2002.
[8] Kohler, E., Handley, M., and S. Floyd, "Datagram Congestion
Control Protocol (DCCP)", RFC 4340, March 2006.
Authors' Addresses
Cullen Jennings
Cisco Systems
170 West Tasman Drive
MS: SJC-21/2
San Jose, CA 95134
USA
Phone: +1 408 902-3341
Email: fluffy@cisco.com
Nagendra Modadugu
Stanford University
353 Serra Mall
Stanford, CA 94305
USA
Email: Nagendra@cs.stanford.edu
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