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
810
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
Updates on MLS on Ruby (and maybe more)
sylph01
1
200
End-to-End Encryption Saves Lives. You Can Start Saving Lives With Ruby, Too (RubyConf Taiwan 2025 ver.)
sylph01
1
97
PicoRuby's Networking is Incomplete
sylph01
1
49
The Definitive? Guide To Locally Organizing RubyKaigi
sylph01
6
1.7k
End-to-End Encryption Saves Lives. You Can Start Saving Lives With Ruby, Too
sylph01
1
140
End-to-End Encryption Saves Lives. You Can Start Saving Lives With Ruby, Too (JP subtitles)
sylph01
2
690
Introduction to C Extensions
sylph01
3
220
"Actual" Security in Microcontroller Ruby!?
sylph01
0
160
Everyone Now Understands AuthZ/AuthN and Encryption Perfectly and I'm Gonna Lose My Job
sylph01
1
79
Other Decks in Technology
See All in Technology
What's new in OpenShift 4.20
redhatlivestreaming
0
320
Okta Identity Governanceで実現する最小権限の原則 / Implementing the Principle of Least Privilege with Okta Identity Governance
tatsumin39
0
180
re:Invent 2025の見どころと便利アイテムをご紹介 / Highlights and Useful Items for re:Invent 2025
yuj1osm
0
220
知覚とデザイン
rinchoku
1
610
Kubernetes self-healing of your workload
hwchiu
0
580
Azure Well-Architected Framework入門
tomokusaba
1
140
ラスベガスの歩き方 2025年版(re:Invent 事前勉強会)
junjikoide
0
430
ViteとTypeScriptのProject Referencesで 大規模モノレポのUIカタログのリリースサイクルを高速化する
shuta13
3
220
AWS re:Invent 2025事前勉強会資料 / AWS re:Invent 2025 pre study meetup
kinunori
0
660
生成AI時代のPythonセキュリティとガバナンス
abenben
0
140
20251027_マルチエージェントとは
almondo_event
1
460
オブザーバビリティと育てた ID管理・認証認可基盤の歩み / The Journey of an ID Management, Authentication, and Authorization Platform Nurtured with Observability
kaminashi
1
1k
Featured
See All Featured
StorybookのUI Testing Handbookを読んだ
zakiyama
31
6.2k
Reflections from 52 weeks, 52 projects
jeffersonlam
354
21k
The Pragmatic Product Professional
lauravandoore
36
7k
jQuery: Nuts, Bolts and Bling
dougneiner
65
7.9k
Making Projects Easy
brettharned
120
6.4k
Product Roadmaps are Hard
iamctodd
PRO
55
11k
Creating an realtime collaboration tool: Agile Flush - .NET Oxford
marcduiker
34
2.3k
How to Ace a Technical Interview
jacobian
280
24k
Responsive Adventures: Dirty Tricks From The Dark Corners of Front-End
smashingmag
253
22k
Fashionably flexible responsive web design (full day workshop)
malarkey
407
66k
Scaling GitHub
holman
463
140k
Fantastic passwords and where to find them - at NoRuKo
philnash
52
3.5k
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