Using Multicast DNS to protect privacy when exposing ICE candidates
draft-ietf-rtcweb-mdns-ice-candidates-03
RTCWEB Y. Fablet
Internet-Draft Apple Inc.
Intended status: Informational J. de Borst
Expires: September 26, 2019 J. Uberti
Q. Wang
Google
March 25, 2019
Using Multicast DNS to protect privacy when exposing ICE candidates
draft-ietf-rtcweb-mdns-ice-candidates-03
Abstract
WebRTC applications collect ICE candidates as part of the process of
creating peer-to-peer connections. To maximize the probability of a
direct peer-to-peer connection, client private IP addresses are
included in this candidate collection. However, disclosure of these
addresses has privacy implications. This document describes a way to
share local IP addresses with other clients while preserving client
privacy. This is achieved by concealing IP addresses with
dynamically generated Multicast DNS (mDNS) names.
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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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 September 26, 2019.
Copyright Notice
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Provisions Relating to IETF Documents
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Fablet, et al. Expires September 26, 2019 [Page 1]
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 3
3. Description . . . . . . . . . . . . . . . . . . . . . . . . . 3
3.1. ICE Candidate Gathering . . . . . . . . . . . . . . . . . 3
3.1.1. Procedure . . . . . . . . . . . . . . . . . . . . . . 4
3.1.2. Implementation Guidance . . . . . . . . . . . . . . . 4
3.2. ICE Candidate Processing . . . . . . . . . . . . . . . . 6
3.2.1. Procedure . . . . . . . . . . . . . . . . . . . . . . 6
3.2.2. Implementation Guidance . . . . . . . . . . . . . . . 6
3.3. Additional Privacy Considerations . . . . . . . . . . . . 6
3.3.1. Statistics . . . . . . . . . . . . . . . . . . . . . 7
3.3.2. Interactions With TURN Servers . . . . . . . . . . . 7
3.3.3. Generated Name Reuse . . . . . . . . . . . . . . . . 8
3.3.4. Specific Browsing Contexts . . . . . . . . . . . . . 8
3.3.5. Network Interface Enumeration . . . . . . . . . . . . 8
3.3.6. Monitoring of Sessions . . . . . . . . . . . . . . . 8
4. Potential Limitations . . . . . . . . . . . . . . . . . . . . 9
4.1. Reduced Connectivity . . . . . . . . . . . . . . . . . . 9
4.2. Connection Setup Latency . . . . . . . . . . . . . . . . 9
4.3. Backward Compatibility . . . . . . . . . . . . . . . . . 10
5. Examples . . . . . . . . . . . . . . . . . . . . . . . . . . 10
5.1. Normal Handling . . . . . . . . . . . . . . . . . . . . . 10
5.2. Peer-reflexive Candidate From Slow Signaling . . . . . . 11
5.3. Peer-reflexive Candidate From Slow Resolution . . . . . . 11
5.4. IPv4, IPv6, and STUN handling . . . . . . . . . . . . . . 12
6. Security Considerations . . . . . . . . . . . . . . . . . . . 14
6.1. mDNS Message Flooding . . . . . . . . . . . . . . . . . . 14
6.2. Malicious Responses to Deny Name Registration . . . . . . 15
6.3. Unsolicited ICE Communications . . . . . . . . . . . . . 15
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 16
8. References . . . . . . . . . . . . . . . . . . . . . . . . . 16
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