Service Registration Protocol for DNS-Based Service Discovery
draft-ietf-dnssd-srp-04
Internet Engineering Task Force T. Lemon
Internet-Draft S. Cheshire
Intended status: Informational Apple Inc.
Expires: January 14, 2021 July 13, 2020
Service Registration Protocol for DNS-Based Service Discovery
draft-ietf-dnssd-srp-04
Abstract
The Service Registration Protocol for DNS-Based Service Discovery
uses the standard DNS Update mechanism to enable DNS-Based Service
Discovery using only unicast packets. This makes it possible to
deploy DNS Service Discovery without multicast, which greatly
improves scalability and improves performance on networks where
multicast service is not an optimal choice, particularly 802.11
(Wi-Fi) and 802.15.4 (IoT) networks. DNS-SD Service registration
uses public keys and SIG(0) to allow services to defend their
registrations against attack.
Status of This Memo
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This Internet-Draft will expire on January 14, 2021.
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document authors. All rights reserved.
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Lemon & Cheshire Expires January 14, 2021 [Page 1]
Internet-Draft Service Registration Protocol July 2020
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Service Registration Protocol . . . . . . . . . . . . . . . . 4
2.1. What to publish . . . . . . . . . . . . . . . . . . . . . 5
2.2. Where to publish it . . . . . . . . . . . . . . . . . . . 6
2.3. How to publish it . . . . . . . . . . . . . . . . . . . . 6
2.3.1. How DNS-SD Service Registration differs from standard
RFC2136 DNS Update . . . . . . . . . . . . . . . . . 7
2.4. How to secure it . . . . . . . . . . . . . . . . . . . . 7
2.4.1. First-Come First-Served Naming . . . . . . . . . . . 8
2.4.2. Removing published services . . . . . . . . . . . . . 9
2.4.3. SRP Server Behavior . . . . . . . . . . . . . . . . . 9
2.5. TTL Consistency . . . . . . . . . . . . . . . . . . . . . 12
2.6. Maintenance . . . . . . . . . . . . . . . . . . . . . . . 13
2.6.1. Cleaning up stale data . . . . . . . . . . . . . . . 13
2.6.2. Sleep Proxy . . . . . . . . . . . . . . . . . . . . . 14
3. Security Considerations . . . . . . . . . . . . . . . . . . . 15
3.1. Source Validation . . . . . . . . . . . . . . . . . . . . 15
3.2. SIG(0) signature validation . . . . . . . . . . . . . . . 16
3.3. Required Signature Algorithm . . . . . . . . . . . . . . 16
4. Privacy Considerations . . . . . . . . . . . . . . . . . . . 16
5. Delegation of 'service.arpa.' . . . . . . . . . . . . . . . . 16
6. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 16
6.1. Registration and Delegation of 'service.arpa' as a
Special-Use Domain Name . . . . . . . . . . . . . . . . . 17
6.2. 'dnssd-srp' Service Name . . . . . . . . . . . . . . . . 17
6.3. 'dnssd-srp-tls' Service Name . . . . . . . . . . . . . . 17
6.4. Anycast Address . . . . . . . . . . . . . . . . . . . . . 17
7. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 18
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 18
8.1. Normative References . . . . . . . . . . . . . . . . . . 18
8.2. Informative References . . . . . . . . . . . . . . . . . 19
Appendix A. Testing using standard RFC2136-compliant servers . . 20
Appendix B. How to allow services to update standard
RFC2136-compliant servers . . . . . . . . . . . . . 21
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