Distributed Denial-of-Service Open Threat Signaling (DOTS) Signal Channel Specification
draft-ietf-dots-rfc8782-bis-01
Document Type Active Internet-Draft (dots WG)
Authors Mohamed Boucadair  , Jon Shallow  , Tirumaleswar Reddy.K 
Last updated 2020-10-22 (latest revision 2020-09-25)
Replaces draft-boucadair-dots-rfc8782-bis
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DOTS                                                   M. Boucadair, Ed.
Internet-Draft                                                    Orange
Obsoletes: 8782 (if approved)                                 J. Shallow
Intended status: Standards Track
Expires: March 29, 2021                                       T. Reddy.K
                                                                  McAfee
                                                      September 25, 2020

   Distributed Denial-of-Service Open Threat Signaling (DOTS) Signal
                         Channel Specification
                     draft-ietf-dots-rfc8782-bis-01

Abstract

   This document specifies the Distributed Denial-of-Service Open Threat
   Signaling (DOTS) signal channel, a protocol for signaling the need
   for protection against Distributed Denial-of-Service (DDoS) attacks
   to a server capable of enabling network traffic mitigation on behalf
   of the requesting client.

   A companion document defines the DOTS data channel, a separate
   reliable communication layer for DOTS management and configuration
   purposes.

   This document obsoletes RFC 8782.

Status of This Memo

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

   Internet-Drafts are working documents of the Internet Engineering
   Task Force (IETF).  Note that other groups may also distribute
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on March 29, 2021.

Boucadair, et al.        Expires March 29, 2021                 [Page 1]
Internet-Draft        DOTS Signal Channel Protocol        September 2020

Copyright Notice

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   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   5
   3.  Design Overview . . . . . . . . . . . . . . . . . . . . . . .   6
   4.  DOTS Signal Channel: Messages & Behaviors . . . . . . . . . .   9
     4.1.  DOTS Server(s) Discovery  . . . . . . . . . . . . . . . .   9
     4.2.  CoAP URIs . . . . . . . . . . . . . . . . . . . . . . . .   9
     4.3.  Happy Eyeballs for DOTS Signal Channel  . . . . . . . . .  10
     4.4.  DOTS Mitigation Methods . . . . . . . . . . . . . . . . .  12
       4.4.1.  Request Mitigation  . . . . . . . . . . . . . . . . .  13
       4.4.2.  Retrieve Information Related to a Mitigation  . . . .  29
         4.4.2.1.  DOTS Servers Sending Mitigation Status  . . . . .  35
         4.4.2.2.  DOTS Clients Polling for Mitigation Status  . . .  37
       4.4.3.  Efficacy Update from DOTS Clients . . . . . . . . . .  38
       4.4.4.  Withdraw a Mitigation . . . . . . . . . . . . . . . .  40
     4.5.  DOTS Signal Channel Session Configuration . . . . . . . .  41
       4.5.1.  Discover Configuration Parameters . . . . . . . . . .  43
       4.5.2.  Convey DOTS Signal Channel Session Configuration  . .  48
       4.5.3.  Configuration Freshness and Notifications . . . . . .  54
       4.5.4.  Delete DOTS Signal Channel Session Configuration  . .  55
     4.6.  Redirected Signaling  . . . . . . . . . . . . . . . . . .  56
     4.7.  Heartbeat Mechanism . . . . . . . . . . . . . . . . . . .  58
   5.  DOTS Signal Channel YANG Modules  . . . . . . . . . . . . . .  61
     5.1.  Tree Structure  . . . . . . . . . . . . . . . . . . . . .  61
     5.2.  IANA DOTS Signal Channel YANG Module  . . . . . . . . . .  64
     5.3.  IETF DOTS Signal Channel YANG Module  . . . . . . . . . .  68
   6.  YANG/JSON Mapping Parameters to CBOR  . . . . . . . . . . . .  81
   7.  (D)TLS Protocol Profile and Performance Considerations  . . .  84
     7.1.  (D)TLS Protocol Profile . . . . . . . . . . . . . . . . .  84
     7.2.  (D)TLS 1.3 Considerations . . . . . . . . . . . . . . . .  86
     7.3.  DTLS MTU and Fragmentation  . . . . . . . . . . . . . . .  88
   8.  Mutual Authentication of DOTS Agents & Authorization of DOTS
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