Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
DNS Encryption and Its Controversies
Search
sylph01
December 19, 2020
Technology
0
740
DNS Encryption and Its Controversies
DNS暗号化とその論点 @ DNS温泉番外編 in 大阪
sylph01
December 19, 2020
Tweet
Share
More Decks by sylph01
See All by sylph01
"Actual" Security in Microcontroller Ruby!?
sylph01
0
92
Everyone Now Understands AuthZ/AuthN and Encryption Perfectly and I'm Gonna Lose My Job
sylph01
1
32
Updates on PicoRuby Networking, HPKE (and maybe more)
sylph01
1
250
Adding Security to Microcontroller Ruby
sylph01
2
3.3k
Secure Messaging at IETF 118
sylph01
0
84
Adventures in the Dungeons of OpenSSL
sylph01
0
530
Community & RubyKaigi Showcase @ Ehime.rb Reboot Meetup
sylph01
0
330
Build and Learn Rails Authentication
sylph01
8
2.1k
Email, Messaging, and Self-Sovereign Identity (2021/05/28 edition)
sylph01
0
310
Other Decks in Technology
See All in Technology
Autonomous Database Serverless 技術詳細 / adb-s_technical_detail_jp
oracle4engineer
PRO
17
45k
Exadata Database Service on Cloud@Customer セキュリティ、ネットワーク、および管理について
oracle4engineer
PRO
2
1.5k
OCI Success Journey OCIの何が評価されてる?疑問に答える事例セミナー(2025年2月実施)
oracle4engineer
PRO
2
160
Share my, our lessons from the road to re:Invent
naospon
0
150
【5分でわかる】セーフィー エンジニア向け会社紹介
safie_recruit
0
19k
PHPで印刷所に入稿できる名札データを作る / Generating Print-Ready Name Tag Data with PHP
tomzoh
0
190
IoTシステム開発の複雑さを低減するための統合的アーキテクチャ
kentaro
1
120
技術スタックだけじゃない、業務ドメイン知識のオンボーディングも同じくらいの量が必要な話
niftycorp
PRO
0
110
Perlの生きのこり - エンジニアがこの先生きのこるためのカンファレンス2025
kfly8
2
270
RayでPHPのデバッグをちょっと快適にする
muno92
PRO
0
190
IAMポリシーのAllow/Denyについて、改めて理解する
smt7174
2
210
【詳説】コンテンツ配信 システムの複数機能 基盤への拡張
hatena
0
270
Featured
See All Featured
Making Projects Easy
brettharned
116
6k
KATA
mclloyd
29
14k
Design and Strategy: How to Deal with People Who Don’t "Get" Design
morganepeng
129
19k
Principles of Awesome APIs and How to Build Them.
keavy
126
17k
Gamification - CAS2011
davidbonilla
80
5.2k
How To Stay Up To Date on Web Technology
chriscoyier
790
250k
The Art of Programming - Codeland 2020
erikaheidi
53
13k
What's in a price? How to price your products and services
michaelherold
244
12k
Raft: Consensus for Rubyists
vanstee
137
6.8k
Code Review Best Practice
trishagee
67
18k
Practical Orchestrator
shlominoach
186
10k
Building Better People: How to give real-time feedback that sticks.
wjessup
367
19k
Transcript
DNS҉߸Խͱͦͷ sylph01 / Ryo Kajiwara @ DNSԹઘ൪֎ฤ in େࡕ, 2020/12/19
୭ʁ ֿݪ ཾ(sylph01) Twitter: @s01 ੜͷϓϩάϥϚ ҉߸ͱ͔Ͱ͖·͢ TLSΑΓ্ͷ DNS·ΔͰΘ͔ΒΜ
એ "DNSDNS Resolution" ͳΔຊΛॻ͍ٕͯ ज़ॻయ6(2019/4)Ͱ൦͠·ͨ͠ DNSʹର͢Δ߈ܸɺDNSϒϩοΩϯάɺ DNSSECɺDNS over TLS/HTTPS͋ͨΓ ͷɺDNSͷηΩϡϦςΟɾϓϥΠόγʔ
ʹؔΘΔτϐοΫΛѻ͍ͬͯ·͢ ࠓѻ͏DNS҉߸Խͷѻ͍ͬͯ·͢ ૿ิ൛Ͱ͋Δ"append mix"ΛBOOTHʹͯ ൦த
None
preface DNSSECͷͰͳ͍ɻ DNSSECॺ໊Ͱ͋ͬͯ҉߸ԽͰͳ͍ɻ DNS queryͷ౪ௌʹΑͬͯݸਓͷᅂɾࢥʹؔ͢ΔใΛऩू͢ Δ͜ͱ͕Մೳɺ͋Δ͍ϒϩοΩϯάΛߦ͏͜ͱ͕Մೳɻͦͷର ࡦͱͯ͠ͷDNS҉߸Խɻ DNS҉߸ԽΠϯλʔωοτ҉߸ԽͷϥετϫϯϚΠϧɻ
࣌ؒతʹද໘ͳͧΔͩ ͚Ͱ͢
Pervasive Monitoring is an Attack RFC 7258 2014/5
DNS Privacy Considerations RFC 7626 2015/8
None
DNS over TLS (DoT) RFC 7858 2016/5
DNS Queries over HTTPS (DoH) RFC 8484 2018/10
DoT vs DoH • DoTport 853Λ͏ɺDoHHTTPSͱಉ༷port 443Λ͏ • DoTport 853ͷϒϩοΩϯάͰՄೳ
• DoHport 443Λར༻͢ΔͷͰ௨ৗͷHTTPSϦΫΤετͱ۠ผ Ͱ͖ͳ͍ • ҰํͰΑ͘ΒΕ͍ͯΔDoHରԠαʔόʔͷIPϒϩοΩ ϯάΛߦ͑Մೳ
Oblivious DNS over HTTPS draft-pauly-dprive-oblivious-doh -00 @ 2020/10, -03 @
2020/12
None
None
DNS over QUIC https:/ /adguard.com/ja/blog/dns- over-quic.html
DNSCrypt, DNSCurve …ଘࡏ͢Δ͚ͲIETFͰඪ४Խ͞Εͯ ͳ͍ͷͰུ
None
: චऀ҉߸ԽਪਐدΓ Ͱ͢
DoT/DoH/ODoH ωοτϫʔΫཧऀʹ ͱͬͯ߹͕ѱ͍
ͦΕ ༷Ͱ͢
DNS҉߸Խsysadminʹ ߹͕ѱ͍ • ॾʑͷࣄ • DNSΛͬͯad-blocking, parental controlΛ͍ͨ͠ • DNSΛͬͯϗϞάϥϑ߈ܸtyposquatting͔ΒӴ͍ͨ͠
• nextdns.io ͱ͍͏αʔϏε͕ࣄ࣮ଘࡏ͢Δ • ͿͬͪΌ͚ ৗ࣌HTTPSԽE2EEsysadminʹ߹͕ѱ͍
DNS҉߸Խsysadminʹ ߹͕ѱ͍ • ͔͠͠DoT/DoH/ODoHωοτϫʔΫཧऀ͕ѱҙΛ͍࣋ͬͯ ΔέʔεΛఆͯ͠σβΠϯ͞Ε͍ͯΔ • ϓϩόΠμ͕σʔλΛऩू͍ͯ͠Δέʔε • ϓϩόΠμͱ݁ୗͯ͠ػ͕ؔσʔλΛऩू͢Δέʔε •
"Pervasive Monitoring is an Attack"
stub-recursive, recursive- authoritative͚ؒͩ҉߸Խ͢Δ͜ͱ Ͱ͖Δ͔ʁ • pervasive monitoringͷରࡦʹͳΔɺrecursive͕ѱҙͷ͋Δέʔ εҙຯͳ͍ • IPΞυϨεূ໌ॻͷऔಘͷϋʔυϧ͕ߴ͘ଓઌೝূ͕ࠔ
• ଓઌೝূΛͤͣ҉߸Խ͚ͩ͢Δ͜ͱΛ͢Εpervasive monitoringͷରࡦՄೳ
PKIΛͬͨTLSཱ͕ ͢ΔͷׂͱDNSͷ͓ ͔͛Έ͍ͨͳͱ͜Ζ͕ ͋Δ
DNSϒϩοΩϯάͱ ʮΠϯλʔωοτΛڊ େͳΠϯτϥωοτͱ Έͳͯ͠ཧ͍ͨ͠ʯ ͱ͍͏͜ͱʹ૬
DoT/DoHΠϯλʔωοτͷ தԝूݖԽΛଅ͢ • DoT/DoHαʔόʔͲ͏ͬͯબ͞ΕΔͷʁ • ৴༻Ͱ͖ΔDoT/DoHαʔόʔͱʁ • DoT/DoH৴༻ͷΛωοτϫʔΫࣄۀऀ͔ΒDoT/DoHαʔ όʔӡ༻ऀʹԡ͚͍ͯ͠Δ͚ͩͰͳ͍͔ʁ •
DoT/DoHαʔόʔࣄۀऀ͕ѱତͪͨ͠Βʁ
None
·ͱΊ • DNS queryͷ౪ௌ͕ࠔΔͷͰDNS҉߸Խ͕ੜ·ΕͨΑ • DNS over TLS (DoT), DNS
Queries over HTTPS (DoH)ͱ͍͏ͷ͕ओͳ ख๏ͩΑ • ҉߸Խ͞ΕΔͱsysadminʹ߹͕ѱ͍ɺ͚Ͳ༷ͩΑ • ৴༻ͬͯԿͩΖ͏
Questions? send to @s01 on Twitter