DNS Server Selection: DNS Server Information with Assertion Token
draft-reddy-add-server-policy-selection-00
DPRIVE WG T. Reddy
Internet-Draft McAfee
Intended status: Standards Track D. Wing
Expires: September 19, 2020 Citrix
M. Richardson
Sandelman Software Works
M. Boucadair
Orange
March 18, 2020
DNS Server Selection: DNS Server Information with Assertion Token
draft-reddy-add-server-policy-selection-00
Abstract
The document defines a mechanism that allows communication of DNS
resolver information to DNS clients for use in selection decisions.
In particuler, the document defines a mechanism for a DNS server to
communicate its filtering policy and its privacy statement URL to DNS
clients. This information is cryptographically signed to attest its
authenticity. Such information is used for the selection of DNS
resolvers. Typically, evaluating the DNS privacy statement,
filtering policy, and the signatory, DNS clients with minimum human
intervention can select the DNS server that best supports the user's
desired privacy and filtering policy.
This assertion is useful for DNS-over-TLS and DNS-over-HTTPS servers
that are either public resolvers or are discovered on a local
network.
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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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 September 19, 2020.
Reddy, et al. Expires September 19, 2020 [Page 1]
Internet-Draft DNS Server Info with Assertion Token March 2020
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Sample Use Cases . . . . . . . . . . . . . . . . . . . . . . 4
3. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 5
4. Policy Assertion Token (PAT): Overview . . . . . . . . . . . 5
5. PAT Header . . . . . . . . . . . . . . . . . . . . . . . . . 6
5.1. 'typ' (Type) Header Parameter . . . . . . . . . . . . . . 6
5.2. 'alg' (Algorithm) Header Parameter . . . . . . . . . . . 6
5.3. 'x5u' (X.509 URL) Header Parameter . . . . . . . . . . . 7
5.4. An Example of PAT Header . . . . . . . . . . . . . . . . 7
6. PAT Payload . . . . . . . . . . . . . . . . . . . . . . . . . 7
6.1. JWT Defined Claims . . . . . . . . . . . . . . . . . . . 8
6.1.1. 'iat' - Issued At Claim . . . . . . . . . . . . . . . 8
6.1.2. 'exp' - Expiration Time Claim . . . . . . . . . . . . 8
6.2. PAT Specific Claims . . . . . . . . . . . . . . . . . . . 8
6.2.1. DNS Server Identity Claims . . . . . . . . . . . . . 8
6.2.2. 'policyinfo' (Policy Information) Claim . . . . . . . 9
6.2.3. Example . . . . . . . . . . . . . . . . . . . . . . . 9
7. PAT Signature . . . . . . . . . . . . . . . . . . . . . . . . 10
8. Extending PAT . . . . . . . . . . . . . . . . . . . . . . . . 11
9. Deterministic JSON Serialization . . . . . . . . . . . . . . 11
9.1. Example PAT Deterministic JSON Form . . . . . . . . . . . 12
10. Privacy Considerations . . . . . . . . . . . . . . . . . . . 12
11. Security Considerations . . . . . . . . . . . . . . . . . . . 13
12. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 13
12.1. Media Type Registration . . . . . . . . . . . . . . . . 13
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