draft-ietf-dprive-bcp-op-08.txt   draft-ietf-dprive-bcp-op-09.txt 
dprive S. Dickinson dprive S. Dickinson
Internet-Draft Sinodun IT Internet-Draft Sinodun IT
Intended status: Best Current Practice B. Overeinder Intended status: Best Current Practice B. Overeinder
Expires: July 27, 2020 R. van Rijswijk-Deij Expires: November 5, 2020 R. van Rijswijk-Deij
NLnet Labs NLnet Labs
A. Mankin A. Mankin
Salesforce Salesforce
January 24, 2020 May 4, 2020
Recommendations for DNS Privacy Service Operators Recommendations for DNS Privacy Service Operators
draft-ietf-dprive-bcp-op-08 draft-ietf-dprive-bcp-op-09
Abstract Abstract
This document presents operational, policy, and security This document presents operational, policy, and security
considerations for DNS recursive resolver operators who choose to considerations for DNS recursive resolver operators who choose to
offer DNS Privacy services. With these recommendations, the operator offer DNS Privacy services. With these recommendations, the operator
can make deliberate decisions regarding which services to provide, can make deliberate decisions regarding which services to provide,
and how the decisions and alternatives impact the privacy of users. and how the decisions and alternatives impact the privacy of users.
This document also presents a framework to assist writers of a DNS This document also presents a framework to assist writers of a DNS
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Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet- working documents as Internet-Drafts. The list of current Internet-
Drafts is at http://datatracker.ietf.org/drafts/current/. Drafts is at http://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
This Internet-Draft will expire on July 27, 2020. This Internet-Draft will expire on November 5, 2020.
Copyright Notice Copyright Notice
Copyright (c) 2020 IETF Trust and the persons identified as the Copyright (c) 2020 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of (http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents publication of this document. Please review these documents
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In this section we consider both data on the wire and the service In this section we consider both data on the wire and the service
provided to the client. provided to the client.
5.1.1. Transport recommendations 5.1.1. Transport recommendations
[RFC6973] Threats: [RFC6973] Threats:
o Surveillance: o Surveillance:
* Passive surveillance of traffic on the wire * Passive surveillance of traffic on the wire
[I-D.ietf-dprive-rfc7626-bis] Section 2.4.2. [I-D.ietf-dprive-rfc7626-bis] Section 5.1
DNS Privacy Threats: DNS Privacy Threats:
o Active injection of spurious data or traffic. o Active injection of spurious data or traffic.
Mitigations: Mitigations:
A DNS privacy service can mitigate these threats by providing service A DNS privacy service can mitigate these threats by providing service
over one or more of the following transports over one or more of the following transports
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Whilst encryption of DNS traffic can protect against active injection Whilst encryption of DNS traffic can protect against active injection
this does not diminish the need for DNSSEC, see Section 5.1.4. this does not diminish the need for DNSSEC, see Section 5.1.4.
5.1.2. Authentication of DNS privacy services 5.1.2. Authentication of DNS privacy services
[RFC6973] Threats: [RFC6973] Threats:
o Surveillance: o Surveillance:
* Active attacks that can redirect traffic to rogue servers * Active attacks on resolver configuration
[I-D.ietf-dprive-rfc7626-bis] Section 2.5.3. [I-D.ietf-dprive-rfc7626-bis] Section 6.1.2
Mitigations: Mitigations:
DNS privacy services should ensure clients can authenticate the DNS privacy services should ensure clients can authenticate the
server. Note that this, in effect, commits the DNS privacy service server. Note that this, in effect, commits the DNS privacy service
to a public identity users will trust. to a public identity users will trust.
When using DNS-over-TLS clients that select a 'Strict Privacy' usage When using DNS-over-TLS clients that select a 'Strict Privacy' usage
profile [RFC8310] (to mitigate the threat of active attack on the profile [RFC8310] (to mitigate the threat of active attack on the
client) require the ability to authenticate the DNS server. To client) require the ability to authenticate the DNS server. To
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Jim Hague Jim Hague
Sinodun Internet Technologies Sinodun Internet Technologies
Magdalen Centre Magdalen Centre
Oxford Science Park Oxford Science Park
Oxford OX4 4GA Oxford OX4 4GA
United Kingdom United Kingdom
11. Changelog 11. Changelog
draft-ietf-dprive-bcp-op-09
o Fix references so they match the correct section numbers in draft-
ietf-dprive-rfc7626-bis-05
draft-ietf-dprive-bcp-op-08 draft-ietf-dprive-bcp-op-08
o Address IETF Last call comments. o Address IETF Last call comments.
draft-ietf-dprive-bcp-op-07 draft-ietf-dprive-bcp-op-07
o Editorial changes following AD review. o Editorial changes following AD review.
o Change all URIs to Informational References. o Change all URIs to Informational References.
draft-ietf-dprive-bcp-op-06
o Final minor changes from second WGLC. o Final minor changes from second WGLC.
draft-ietf-dprive-bcp-op-05
o Remove some text on consent: o Remove some text on consent:
* Paragraph 2 in section 5.3.3 * Paragraph 2 in section 5.3.3
* Item 6 in the DROP Practice statement (and example) * Item 6 in the DROP Practice statement (and example)
o Remove .onion and TLSA options o Remove .onion and TLSA options
o Include ACME as a reference for certificate management o Include ACME as a reference for certificate management
 End of changes. 9 change blocks. 
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