DNS Zone Transfer-over-TLS
draft-ietf-dprive-xfr-over-tls-00
dprive H. Zhang
Internet-Draft P. Aras
Updates: 1995 (if approved) Salesforce
Intended status: Standards Track W. Toorop
Expires: May 21, 2020 NLnet Labs
S. Dickinson
Sinodun IT
A. Mankin
Salesforce
November 18, 2019
DNS Zone Transfer-over-TLS
draft-ietf-dprive-xfr-over-tls-00
Abstract
DNS zone transfers are transmitted in clear text, which gives
attackers the opportunity to collect the content of a zone by
eavesdropping on network connections. The DNS Transaction Signature
(TSIG) mechanism is specified to restrict direct zone transfer to
authorized clients only, but it does not add confidentiality. This
document specifies use of DNS-over-TLS to prevent zone contents
collection via passive monitoring of zone transfers.
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
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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 May 21, 2020.
Copyright Notice
Copyright (c) 2019 IETF Trust and the persons identified as the
document authors. All rights reserved.
Zhang, et al. Expires May 21, 2020 [Page 1]
Internet-Draft XFR-over-TLS November 2019
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Use Cases for XFR-over-TLS . . . . . . . . . . . . . . . . . 4
4. Connection and Data Flows in Existing XFR Mechanisms . . . . 5
4.1. AXFR Mechanism . . . . . . . . . . . . . . . . . . . . . 5
4.2. IXFR Mechanism . . . . . . . . . . . . . . . . . . . . . 6
4.3. Data Leakage of NOTIFY and SOA Message Exchanges . . . . 7
4.3.1. NOTIFY . . . . . . . . . . . . . . . . . . . . . . . 7
4.3.2. SOA . . . . . . . . . . . . . . . . . . . . . . . . . 8
5. Connection and Data Flows in XoT . . . . . . . . . . . . . . 8
5.1. Performance Considerations . . . . . . . . . . . . . . . 8
5.2. AXoT mechanism . . . . . . . . . . . . . . . . . . . . . 8
5.3. IXoT mechanism . . . . . . . . . . . . . . . . . . . . . 9
5.3.1. Fallback to AXFR . . . . . . . . . . . . . . . . . . 10
6. Zone Transfer with DoT - Authentication . . . . . . . . . . . 10
6.1. TSIG . . . . . . . . . . . . . . . . . . . . . . . . . . 10
6.2. SIG(0) . . . . . . . . . . . . . . . . . . . . . . . . . 10
6.3. TLS . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
6.3.1. Opportunistic . . . . . . . . . . . . . . . . . . . . 10
6.3.2. Strict . . . . . . . . . . . . . . . . . . . . . . . 10
6.3.3. Mutual . . . . . . . . . . . . . . . . . . . . . . . 10
6.4. IP Based ACL on the Primary . . . . . . . . . . . . . . . 11
6.5. ZONEMD . . . . . . . . . . . . . . . . . . . . . . . . . 11
6.6. Comparison of Authentication Methods . . . . . . . . . . 11
7. Policies for Both AXFR and IXFR . . . . . . . . . . . . . . . 12
8. Multi-primary Configurations . . . . . . . . . . . . . . . . 13
9. Implementation Considerations . . . . . . . . . . . . . . . . 14
10. Implementation Status . . . . . . . . . . . . . . . . . . . . 14
11. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 14
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