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DNS over HTTPS

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DNS over HTTPS
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- the content below is remote from Wikipedia
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{{short description|Protocol to run DNS queries over https}}{{Security protocol}}DNS over HTTPS (DoH) is a protocol for performing remote Domain Name System (DNS) resolution via the HTTPS protocol. A goal of the method is to increase user privacy and security by preventing eavesdropping and manipulation of DNS data by man-in-the-middle attacks.NEWS,weblink IETF protects privacy and helps net neutrality with DNS over HTTPS, 2018-03-21, en, Richard, Chirgwin, 14 Dec 2017, The Register, {{As of|2018|03}}, Google and the Mozilla Foundation are testing versions of DNS over HTTPS.WEB,weblink DNS-over-HTTPS {{!, Public DNS {{!}} Google Developers|website=Google Developers|language=en|access-date=2018-03-21}}NEWS,weblink Mozilla Is Testing "DNS over HTTPS" Support in Firefox, Catalin, Cimpanu, BleepingComputer, 2018-03-21, 2018-03-20, en-us, In addition to improving security, another goal of DNS over HTTPS is to improve performance: testing of ISP DNS resolvers has shown that many often have slow response times, a problem that is exacerbated by the need to potentially have to resolve many hostnames when loading a single web page.

Technical detail

DNS over HTTPS is a proposed standard, published as RFC 8484 (October 2018) by the IETF. It uses HTTP/2 and HTTPS, and supports the wire format DNS response data, as returned in existing UDP responses, in an HTTPS payload with the MIME type application/dns-message.WEB,weblink, RFC 8484 - DNS Queries over HTTPS, datatracker.ietf.org, en, 2018-05-20, P, Hoffman, P, McManus, If HTTP/2 is used, the server may also use HTTP/2 server push to send values that it anticipates the client may find useful in advance.WEB, https:datatracker.ietf.org/doc/draft-ietf-doh-dns-over-https/, draft-ietf-doh-dns-over-https-08 - DNS Queries over HTTPS, datatracker.ietf.org, en, 2018-05-20, P, Hoffman, P, McManus,

Implementation scenarios

DNS over HTTPS is used for recursive DNS resolution by DNS resolvers. Resolvers (DoH clients) must have access to a DoH server hosting a query endpoint.DNS over HTTPS lacks native support in operating systems. Thus, a user wishing to use it must install additional software. Three usage scenarios are common:
  • Using a DoH implementation within an application: Some browsers have a built-in DoH implementation and can thus perform queries by bypassing the operating system's DNS functionality. A drawback is that an application may not inform the user if it skips DoH querying, either by misconfiguration or lack of support for DoH.
  • Installing a DoH proxy on the name server in the local network: In this scenario client systems continue to use traditional (port 53 or 853) DNS to query the name server in the local network, which will then gather the necessary replies via DoH by reaching DoH-servers in the Internet. This method is transparent to the end user.
  • Installing a DoH proxy on a local system: In this scenario, operating systems are configured to query a locally running DoH proxy. In contrast to the previously mentioned method, the proxy needs to be installed on each system wishing to use DoH, which might require a lot of effort in larger environments.
  • Installing a DoH resolving plugin for the operating system
In all of these scenarios, the DoH client does not directly query any authoritative name servers. Instead, the client relies on the DoH server using traditional (port 53 or 853) queries to finally reach authoritative servers. Thus DoH does not qualify as an end-to-end encrypted protocol, only hop-to-hop encrypted and only if DNS over TLS is used consistently.

Public DNS servers using DoH

DNS over HTTPS server implementations are already available for free by some public DNS providersWEB,weblink DNS over HTTPS Implementations, 2018-04-27, 2018-04-27, en-us, . See Public recursive name server for an overview.

Client support

  • AdGuard for AndroidNEWS, Brinkmann, Martin, AdGuard 3.0 for Android: Redesign, Stealth Mode, Custom Filter Lists,weblink 2019-08-02, Ghacks Technology News, 2019-03-21, , AdGuard for iOSNEWS, Orr, Andrew, AdGuard 3 Brings DNS Privacy, 250,000 Filter Rules, Premium Features,weblink 2019-08-02, The Mac Observer, Inc., 2019-07-13, and AdGuard HomeNEWS, Davenport, Corbin, AdGuard officially releases its own DNS service, and it works with Android Pie,weblink 2019-08-01, Android Police, Illogical Robot LLC, 2018-12-29,
  • Cloudflare 1.1.1.1 client app for Android and iOS.WEB,weblink Cloudflare launches Android and iOS apps for its 1.1.1.1 service, Cimpanu, Catalin, ZDNet, en, 2018-12-13,
  • Cloudflare resolver for Linux, MacOS and Windows.WEB, DNS over HTTPS,weblink Argo Tunnel, Cloudflare, 20 July 2019,
  • cURL since 7.62.0.WEB, DoH in curl,weblink
  • DNSCrypt-proxy — Local DNS → DNS over HTTPS proxy.WEB, DNSCrypt-proxy v2.0,weblink 2019-08-05,
  • DNSP — Versatile DNSProxy. DoH server (C) and client (PHP) implementation.WEB, DNSP,weblink 2019-07-22,
  • doh-php-client — PHP Implementation.WEB, DNS over HTTPS PHP Client,weblink 2019-08-03,
  • Firefox since Version 62 and later — Browser support.WEB, Improving DNS Privacy in Firefox,weblink
  • Intra — an Android application by Jigsaw to route your DNS queries to a DNS-over-HTTPS server of your choice.WEB, Intra on Play Store,weblink
  • nss-tls — a DoH-based resolver plugin for glibc.WEB,weblink A DNS over HTTPS resolver for glibc. Contribute to dimkr/NSS-TLS development by creating an account on GitHub, 2019-08-02,
  • Technitium DNS Client — C .NET cross-platform implementation.WEB, DNS over HTTPS C Client,weblink 2019-07-18,
  • Technitium DNS Server — A local DNS server with DNS-over-HTTPS forwarder support.WEB, Technitium DNS Server as DNS-over-HTTPS Proxy,weblink
  • NextDNS client apps.WEB,weblink nextdns, www.nextdns.io, 2019-07-13,
  • Nebulo - DNS over HTTPS/TLS - for android.WEB,weblink Nebulo - DNS over HTTPS/TLS - Apps on Google Play,

Criticism

The Internet Watch Foundation and the Internet Service Providers Association (ISPA)—a trade association representing UK ISPs, criticised Google and Mozilla for supporting DoH, as they believe that it will undermine web blocking programs in the country, including ISP default filtering of adult content, and mandatory court-ordered filtering of copyright violations. Mozilla responded to allegations by the latter (who nominated Mozilla as an "internet villain"), arguing that it would not prevent filtering, and that they were "surprised and disappointed that an industry association for ISPs decided to misrepresent an improvement to decades-old internet infrastructure".WEB,weblink UK ISP group names Mozilla 'Internet Villain' for supporting 'DNS-over-HTTPS', Cimpanu, Catalin, ZDNet, en, 2019-07-05, WEB,weblink Internet group brands Mozilla 'internet villain' for supporting DNS privacy feature, TechCrunch, en-US, 2019-07-19, On 9 July 2019, the ISPA withdrew Mozilla's "Internet Villain Nomination and Category."WEB,weblink ISPA withdraws Mozilla Internet Villain Nomination and Category » News, Press Releases {{!, The Internet Service Providers Association|language=en|access-date=2019-07-21}}

Alternatives

Alternatives to DNS over HTTPS are DNS over TLS, DNSCurve, and DNSCrypt.

See also

References

{{reflist|30em}}

External links



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- time: 1:51pm EDT - Sat, Aug 24 2019
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