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
790
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
The Definitive? Guide To Locally Organizing RubyKaigi
sylph01
6
1.5k
End-to-End Encryption Saves Lives. You Can Start Saving Lives With Ruby, Too
sylph01
1
100
End-to-End Encryption Saves Lives. You Can Start Saving Lives With Ruby, Too (JP subtitles)
sylph01
2
470
Introduction to C Extensions
sylph01
3
200
"Actual" Security in Microcontroller Ruby!?
sylph01
0
140
Everyone Now Understands AuthZ/AuthN and Encryption Perfectly and I'm Gonna Lose My Job
sylph01
1
63
Updates on PicoRuby Networking, HPKE (and maybe more)
sylph01
1
300
Adding Security to Microcontroller Ruby
sylph01
3
3.6k
Secure Messaging at IETF 118
sylph01
0
110
Other Decks in Technology
See All in Technology
自律的なスケーリング手法FASTにおけるVPoEとしてのアカウンタビリティ / dev-productivity-con-2025
yoshikiiida
1
17k
データグループにおけるフロントエンド開発
lycorptech_jp
PRO
1
100
高速なプロダクト開発を実現、創業期から掲げるエンタープライズアーキテクチャ
kawauso
2
9.4k
改めてAWS WAFを振り返る~業務で使うためのポイント~
masakiokuda
2
260
いつの間にか入れ替わってる!?新しいAWS Security Hubとは?
cmusudakeisuke
0
130
MobileActOsaka_250704.pdf
akaitadaaki
0
130
2025-07-06 QGIS初級ハンズオン「はじめてのQGIS」
kou_kita
0
170
ネットワーク保護はどう変わるのか?re:Inforce 2025最新アップデート解説
tokushun
0
210
第4回Snowflake 金融ユーザー会 Snowflake summit recap
tamaoki
1
280
LangSmith×Webhook連携で実現するプロンプトドリブンCI/CD
sergicalsix
1
230
DatabricksにOLTPデータベース『Lakebase』がやってきた!
inoutk
0
110
PO初心者が考えた ”POらしさ”
nb_rady
0
210
Featured
See All Featured
The Success of Rails: Ensuring Growth for the Next 100 Years
eileencodes
45
7.5k
How To Stay Up To Date on Web Technology
chriscoyier
790
250k
Why Our Code Smells
bkeepers
PRO
336
57k
Practical Tips for Bootstrapping Information Extraction Pipelines
honnibal
PRO
20
1.3k
Connecting the Dots Between Site Speed, User Experience & Your Business [WebExpo 2025]
tammyeverts
6
300
Building a Scalable Design System with Sketch
lauravandoore
462
33k
StorybookのUI Testing Handbookを読んだ
zakiyama
30
5.9k
Measuring & Analyzing Core Web Vitals
bluesmoon
7
510
Scaling GitHub
holman
460
140k
Keith and Marios Guide to Fast Websites
keithpitt
411
22k
Code Review Best Practice
trishagee
69
18k
Side Projects
sachag
455
42k
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