dprive D. Migault Internet-Draft Ericsson Intended status: Informational March 18, 2020 Expires: September 19, 2020 Domain Name System Uniform Resource Identifiers for DNS over HTTPS and DNS over TLS draft-mglt-dprive-dns-uri-00 Abstract Today DNS resources may also be accessed using multiple transport which includes DNS over UDP/TCP port 53 [RFC1034],[RFC1035]. DNS over TLS [RFC7858] or DNS over HTTPS [RFC8484]. This document describes URIs that describes the DNS resource as well as indicate the transport to access the resource. 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 September 19, 2020. Copyright Notice Copyright (c) 2020 IETF Trust and the persons identified as the document authors. All rights reserved. This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of Migault Expires September 19, 2020 [Page 1]
Internet-Draft DNS URI for DoH and Dot March 2020 the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License. Table of Contents 1. Requirements Notation . . . . . . . . . . . . . . . . . . . . 2 2. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2 3. DNS over UDP/TCP 53 . . . . . . . . . . . . . . . . . . . . . 2 4. DNS over TLS URI Registration . . . . . . . . . . . . . . . . 4 5. DNS over HTTPS URI registration . . . . . . . . . . . . . . . 5 6. Acknowledgment . . . . . . . . . . . . . . . . . . . . . . . 6 7. Normative References . . . . . . . . . . . . . . . . . . . . 6 Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 7 1. Requirements Notation The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all capitals, as shown here. 2. Introduction [RFC4501] defines an URI [RFC7553] for DNS resources accessed but does not specify the transport used to access the DNS resource. Today DNS resources may also be accessed using multiple transport layers which includes DNS over UDP/TCP port 53 [RFC1034],[RFC1035]. DNS over TLS [RFC7858] or DNS over HTTPS [RFC8484]. This document describes URIs that describes the DNS resource as well as indicate the transport to access the resource. 3. DNS over UDP/TCP 53 This section describes the URI template for the registration of the URI as described in [RFC7595] to describe DNS resources being accessed using DNS over TLS. Migault Expires September 19, 2020 [Page 2]
Internet-Draft DNS URI for DoH and Dot March 2020 URL scheme name: "dns53". URL scheme syntax: A DNS URI designates a DNS resource record set, referenced by domain name, class, type, and, optionally, the authority. The DNS URI follows the generic syntax from {{RFC3986}} and is described using ABNF {{RFC5234}}. Strings are not case sensitive, and free insertion of linear-white-space is not permitted. dnsurl = "dns53:" [ "//" dnsauthority "/" ] dnsname ["?" dnsquery] dnsauthority = host [ ":" port ] ; See RFC 3986 for the ; definition of "host" and "port". dnsname = *pchar ; See RFC 3986 for the ; definition of "pchar". ; The "dnsname" field may be a ; "relative" or "absolute" name, ; as per RFC 1034, section 3.1. ; Note further that an empty ; "dnsname" value is to be ; interpreted as the root itself. ; See below on relative dnsnames. dnsquery = dnsqueryelement [";" dnsquery] dnsqueryelement = ( "CLASS=" dnsclassval ) / ( "TYPE=" dnstypeval ) ; Each clause MUST NOT be used more ; than once. dnsclassval = 1*digit / "IN" / "CH" / <Any IANA registered DNS class mnemonic> dnstypeval = 1*digit / "A" / "NS" / "MD" / <Any IANA registered DNS type mnemonic> The DNS resource follows [RFC4501] but indicates the DNS resource MUST be accessed using UDP or TCP as described in [RFC1034] or [RFC1035]. Migault Expires September 19, 2020 [Page 3]
Internet-Draft DNS URI for DoH and Dot March 2020 4. DNS over TLS URI Registration This section describes the URI template for the registration of the URI as described in [RFC7595] to describe DNS resources being accessed using DNS over TLS. URL scheme name: "dot". URL scheme syntax: A DNS URI designates a DNS resource record set, referenced by domain name, class, type, and, optionally, the authority. The DNS URI follows the generic syntax from {{RFC3986}} and is described using ABNF {{RFC5234}}. Strings are not case sensitive, and free insertion of linear-white-space is not permitted. dnsurl = "dot:" [ "//" dnsauthority "/" ] dnsname ["?" dnsquery] dnsauthority = host [ ":" port ] ; See RFC 3986 for the ; definition of "host" and "port". dnsname = *pchar ; See RFC 3986 for the ; definition of "pchar". ; The "dnsname" field may be a ; "relative" or "absolute" name, ; as per RFC 1034, section 3.1. ; Note further that an empty ; "dnsname" value is to be ; interpreted as the root itself. ; See below on relative dnsnames. dnsquery = dnsqueryelement [";" dnsquery] dnsqueryelement = ( "CLASS=" dnsclassval ) / ( "TYPE=" dnstypeval ) ; Each clause MUST NOT be used more ; than once. dnsclassval = 1*digit / "IN" / "CH" / <Any IANA registered DNS class mnemonic> dnstypeval = 1*digit / "A" / "NS" / "MD" / <Any IANA registered DNS type mnemonic> The DNS resource follows [RFC4501] but indicates the DNS resource MUST be accessed using TCP over TLS as described in [RFC7858]. Migault Expires September 19, 2020 [Page 4]
Internet-Draft DNS URI for DoH and Dot March 2020 5. DNS over HTTPS URI registration This section describes the URI template for the registration of the URI as described in [RFC8484] to describe DNS resources being accessed using DNS over HTTPS. URL scheme name: "doh". URL scheme syntax: A DNS URI designates a DNS resource record set, referenced by domain name, class, type, and, optionally, the authority. The DNS URI follows the generic syntax from {{RFC3986}} and is described using ABNF {{RFC5234}}. Strings are not case sensitive, and free insertion of linear-white-space is not permitted. dnsurl = "doh:" [ "//" dnsauthority "/" ] dnsname ["?" dnsquery] dnsauthority = host [ ":" port ] [ "/" abs_path ] ; See RFC 3986 for the ; definition of "host" and "port" ; "abs_path" dnsname = *pchar ; See RFC 3986 for the ; definition of "pchar". ; The "dnsname" field may be a ; "relative" or "absolute" name, ; as per RFC 1034, section 3.1. ; Note further that an empty ; "dnsname" value is to be ; interpreted as the root itself. ; See below on relative dnsnames. dnsquery = dnsqueryelement [";" dnsquery] dnsqueryelement = ( "CLASS=" dnsclassval ) / ( "TYPE=" dnstypeval ) ; Each clause MUST NOT be used more ; than once. dnsclassval = 1*digit / "IN" / "CH" / <Any IANA registered DNS class mnemonic> dnstypeval = 1*digit / "A" / "NS" / "MD" / <Any IANA registered DNS type mnemonic> Migault Expires September 19, 2020 [Page 5]
Internet-Draft DNS URI for DoH and Dot March 2020 The DNS resource follows [RFC4501] but indicates the DNS resource MUST be accessed using HTTPS as described in [RFC8484]. 6. Acknowledgment The URI template are largly inspired from [RFC4501]. 7. Normative References [RFC1034] Mockapetris, P., "Domain names - concepts and facilities", STD 13, RFC 1034, DOI 10.17487/RFC1034, November 1987, <https://www.rfc-editor.org/info/rfc1034>. [RFC1035] Mockapetris, P., "Domain names - implementation and specification", STD 13, RFC 1035, DOI 10.17487/RFC1035, November 1987, <https://www.rfc-editor.org/info/rfc1035>. [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, DOI 10.17487/RFC2119, March 1997, <https://www.rfc-editor.org/info/rfc2119>. [RFC3986] Berners-Lee, T., Fielding, R., and L. Masinter, "Uniform Resource Identifier (URI): Generic Syntax", STD 66, RFC 3986, DOI 10.17487/RFC3986, January 2005, <https://www.rfc-editor.org/info/rfc3986>. [RFC4501] Josefsson, S., "Domain Name System Uniform Resource Identifiers", RFC 4501, DOI 10.17487/RFC4501, May 2006, <https://www.rfc-editor.org/info/rfc4501>. [RFC5234] Crocker, D., Ed. and P. Overell, "Augmented BNF for Syntax Specifications: ABNF", STD 68, RFC 5234, DOI 10.17487/RFC5234, January 2008, <https://www.rfc-editor.org/info/rfc5234>. [RFC7553] Faltstrom, P. and O. Kolkman, "The Uniform Resource Identifier (URI) DNS Resource Record", RFC 7553, DOI 10.17487/RFC7553, June 2015, <https://www.rfc-editor.org/info/rfc7553>. [RFC7595] Thaler, D., Ed., Hansen, T., and T. Hardie, "Guidelines and Registration Procedures for URI Schemes", BCP 35, RFC 7595, DOI 10.17487/RFC7595, June 2015, <https://www.rfc-editor.org/info/rfc7595>. Migault Expires September 19, 2020 [Page 6]
Internet-Draft DNS URI for DoH and Dot March 2020 [RFC7858] Hu, Z., Zhu, L., Heidemann, J., Mankin, A., Wessels, D., and P. Hoffman, "Specification for DNS over Transport Layer Security (TLS)", RFC 7858, DOI 10.17487/RFC7858, May 2016, <https://www.rfc-editor.org/info/rfc7858>. [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174, May 2017, <https://www.rfc-editor.org/info/rfc8174>. [RFC8484] Hoffman, P. and P. McManus, "DNS Queries over HTTPS (DoH)", RFC 8484, DOI 10.17487/RFC8484, October 2018, <https://www.rfc-editor.org/info/rfc8484>. Author's Address Daniel Migault Ericsson 8275 Trans Canada Route Saint Laurent, QC 4S 0B6 Canada EMail: daniel.migault@ericsson.com Migault Expires September 19, 2020 [Page 7]