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
Email in Rails (and/or introduction to "Dark De...
Search
sylph01
September 18, 2019
Technology
0
1.1k
Email in Rails (and/or introduction to "Dark Depths of Email")
presented at Fukuoka.rb 150th anniversary LT
sylph01
September 18, 2019
Tweet
Share
More Decks by sylph01
See All by sylph01
Updates on PicoRuby Networking, HPKE (and maybe more)
sylph01
1
180
Adding Security to Microcontroller Ruby
sylph01
2
3k
Secure Messaging at IETF 118
sylph01
0
61
Adventures in the Dungeons of OpenSSL
sylph01
0
430
Community & RubyKaigi Showcase @ Ehime.rb Reboot Meetup
sylph01
0
260
Build and Learn Rails Authentication
sylph01
8
2k
Email, Messaging, and Self-Sovereign Identity (2021/05/28 edition)
sylph01
0
250
DNS Encryption and Its Controversies
sylph01
0
690
Email, Messaging, and SSI/DID (再放送)
sylph01
0
1.3k
Other Decks in Technology
See All in Technology
複数の外部サービスデータの統合と変換を実現する Railsのインポートアーキテクチャ / Rails import architecture for integration and transformation of multiple external service data
aiandrox
0
190
Covariance, Contravariance & Diamond
alexdaubois
1
110
WSUSが非推奨に!? Windowsの更新管理を改めて勉強する!
ebibibi
0
550
Demystifying Vite Internals
nozomuikuta
2
210
Oracle Base Database Service 技術詳細
oracle4engineer
PRO
5
48k
テストを楽に書きたい
tomorrowkey
2
260
RAG: from dumb implementation to serious results
glaforge
0
610
フェンリルの SwiftUI の研修を覗いてみる / Fenrir SwiftUI Training
studio_rookery
0
130
ゼロからはじめる生成AI〜AWS認定とハンズオンで学ぶ初心者の道〜
kenichinakamura
0
130
新入社員 オンボーディング改善プロジェクト - シンプルな仕組みで変革のきっかけを
enpipi
0
370
プログラミング写経のすすめ
natsutan
0
150
Transforming Event Attendees into Lifelong Donors: Insights from Claire Axelrad
auctria
PRO
1
110
Featured
See All Featured
Sharpening the Axe: The Primacy of Toolmaking
bcantrill
37
1.7k
Build The Right Thing And Hit Your Dates
maggiecrowley
32
2.3k
"I'm Feeling Lucky" - Building Great Search Experiences for Today's Users (#IAC19)
danielanewman
225
22k
For a Future-Friendly Web
brad_frost
174
9.4k
Building Better People: How to give real-time feedback that sticks.
wjessup
362
19k
Code Reviewing Like a Champion
maltzj
519
39k
Why Our Code Smells
bkeepers
PRO
334
57k
Ruby is Unlike a Banana
tanoku
96
11k
Practical Orchestrator
shlominoach
186
10k
JavaScript: Past, Present, and Future - NDC Porto 2020
reverentgeek
46
4.9k
Optimising Largest Contentful Paint
csswizardry
31
2.9k
Performance Is Good for Brains [We Love Speed 2024]
tammyeverts
3
330
Transcript
Email in Rails, and/or Introduction to the "Dark Depths of
Email" Ryo Kajiwara(sylph01) @ Fukuoka.rb #149/150
୭ʁ sylph01 / ֿݪ ཾ Twitter: @s01 ҉߸ͱ͔Ͱ͖·͢ Elixirͱ͔Ͱ͖·͢ Ruby·ΔͰΘ͔ΒΜ
None
W3CͷձٞͰདྷ·ͨ͠ ͍Ζ͍Ζweb-relatedͳεςοΧʔͱ ͔͋ΔͷͰ͋ͱͰ͔͚͍ͯͩ͘͞
None
None
None
RailsͰϝʔϧͷͯ͢ Λѻ͑ΔΑ͏ʹͳͬ ͨʂ
MTAʮͷʯೖΓޱΛ උ͍͑ͯΔɺͱ͋Δ͚ ͲɺͲͪΒ͔ͱ͍͏ͱ MTAʮ͔ΒͷʯೖΓޱ
͜ΕԿΛ͢Δͷͧ • ड৴ϝʔϧΛActiveRecordΦϒδΣΫτʹม • ActiveStorageͰϥΠϑαΠΫϧཧɺҰఆظؒܦͬͨΒࣗಈম ٫ʢআʣ • ϝʔϧΛड͚ͨͱ͖ͷॲཧΛॻ͚Δ
ݸਓͰϝʔϧΔͷ͓͢͢ Ί͠·ͤΜ • IMAPΔͱετϨʔδࠈʹؕΓ·͢ • ໎ϝʔϧରࡦ͠ΜͲ͍ • ઃఆϛεΔͱϝʔϧ͕૬खʹಧ͖·ͤΜ • ͱ͍͏͔SMTPΛΊΖ
ͳͷͰGuidesʹॻ͍ͯ͋ΔΑ ͏ʹWebαʔϏεΛ͓͏ • Mailgun • Mandrill • Postmark • SendGrid
• ·ͨAmazon SESʢଞʹൺΔͱࣗͰMTAཧ͢Δͷʹۙ͘ ͋Δʣ
ͦΕͰΓͨ͘ͳͬ ͨͱ͖ͷΛ͠·͢
: ͔͜͜ΒNot Ruby Rubyͷݴ༿ͰؤுΓ͔͚ͨͬͨͲؒ ʹ߹Θͳ͔ͬͨΑ…
SMTP Ͳ͕͜SimpleͶΜMail Transfer Protocolɻ RFC 821 → ݱࡏͷ࠷৽ RFC 5321
ʮϝʔϧΛόέπϦϨʔͷΑ͏ʹసૹ͢ΔʯͷͰʮSMTP relayingʯͱ͔ʮϦϨʔαʔόʔʯͱ͔͍͏͚ΕͲݱతʹ͜ͷ Πϝʔδ࣋ͬͯͳͯ͘Α͍Ͱ͢ɻ૬खઌυϝΠϯ໊ͷMXϨίʔ υΛݟͯͦ͜ʹୟ͖͚ͭ·͢ɻ
None
SMTPʹೝূ͕ͳ͍ SMTPϦϨʔػߏΛ࡞ΔͨΊͷϓϩτίϧͳͷͰɺͲ͔͜Βϝʔ ϧ͕དྷ͔ͨΛ͍͍ͪͪೝূ͢Δඞཁ͕ͳ͍ɻཧ۶Θ͔Δͷ͚ͩ Ͳ໎ϝʔϧ͕ͼ͜Δ࠷େͷݪҼͷҰ͕ͭ͜Εɻ POP before SMTPɺSMTP-AUTHͳͲͷ֦ுͰೝূΛ͢Δɻ
SPF, DKIM ͜ͷϝʔϧͪΌΜͱ͜ͷυϝΠϯΛॴ༗͍ͯ͠Δਓʢͷαʔ όʔʣ͔Βདྷͯ·͢Αɺͱ͍͏͜ͱΛ͍ࣔͨ͠ɻ ͲͪΒDNSͷTXTϨίʔυʹهड़Λߦ͏ɻ • SPF: ڐՄ͢ΔIPΞυϨεΛࢦఆɻ • DKIM:
ެ։伴ΛTXTϨίʔυʹઃఆɻαʔόʔൿີ伴Λར༻͠ ͯϝοηʔδʹॺ໊͢Δɻ
SPF TXTϨίʔυʹIPΞυϨεɺ͘͠MXϨίʔυͷυϝΠϯ໊Λࢦ ఆ͢Δ͚ͩɻ ྫ: example.net. IN TXT "v=spf1 ip4:192.0.2.1 -all"
DKIM • opendkimΛΠϯετʔϧͯ͠ઃఆ͢Δ • Δ͜ͱଟ͍ͷͰৄࡉDigitalOceanͷνϡʔτϦΞϧࢀর - https:/ /www.digitalocean.com/community/tutorials/how-to- install-and-configure-dkim-with-postfix-on-debian-wheezy •
ެ։伴ɾൿີ伴ϖΞͷੜͱTXTϨίʔυͷੜΛͬͯ͘ ΕΔ
None
DMARC • ϔομʹࣔ͞ΕΔૹ৴ऀͷυϝΠϯ(Header-From)ͱMAIL FROM ίϚϯυͰ͞ΕΔૹ৴ऀͷυϝΠϯ(Envelope-From)ͷҰகΛ औΔ • Header-FromͷυϝΠϯ໊ͱDKIMͷ"d="Ͱ༩͑ΒΕΔυϝΠϯ ໊ͷҰகΛऔΔ ͱ͍͏ՃͷೝূΛ͢Δɻࣦഊͨ͠߹ʹυϝΠϯΦʔφʔʹ
ͷ͋ΔϝʔϧΛใࠂͰ͖ΔΈ͋Δɻ
SPF, DKIM, DMARCͷઃ ఆϛε͔ͳΓଟ͍ αʔϏεͬͯͯDNSઃఆΕΔͱ ໎ϝʔϧѻ͍͞Ε·͢
ड৴͢Δଆͱͯ͠ ʮ໎ϝʔϧड৴ ϘοΫεʹೖͬͨ࣌ Ͱෛ͚ʯ MTAͰݕূͪΌΜͱ͠Α͏
ૹΔଆͰؾΛ͚ͭͳ ͖Ό͍͚ͳ͍͜ͱ
LTͩͱೖΓΒͳ͍ͷ Ͱ؆୯ʹհ
GoogleͷҰׅૹ৴ΨΠυϥΠ ϯ https:/ /support.google.com/a/answer/81126?hl=ja ૹΔଆ͜Εकͬͯͳ͍ͱ͍ͭͷؒʹ͔໎ϝʔϧϑΥϧμߦ͖ ʹͳΓ·͢ɻ ૹ৴ϘϦϡʔϜ͕େ͖͍߹Postmaster ToolsΛ͏ͱΑ͍ɻ
mail-tester.com https:/ /www.mail-tester.com/ ͜͜ʹϝʔϧૹΔͱIP͕ϒϥοΫϦετ͞ΕͯΔ͔Ͳ͏͔Ұൠ తͳઃఆϛεʹ͍ͭͯڭ͑ͯ͘ΕΔɻ
None
DigitalOcean͔Βૹͬͯ ͨΒMSNʹϒϩοΫ͞ ΕͯͨͰ͟͝Δ
None
چWILLCOMܥͷΞυϨ εʹ௨৴͢Βड͚ ͚ͯΒ͑ͳ͔ͬͨ
None
ݸਓͰϝʔϧΔͷ͓͢͢ Ί͠·ͤΜ(࠶) • IMAPΔͱετϨʔδࠈʹؕΓ·͢ • ໎ϝʔϧରࡦ͠ΜͲ͍ • ઃఆϛεΔͱϝʔϧ͕૬खʹಧ͖·ͤΜ • ͱ͍͏͔SMTPΛΊΖ
ͳͷͰWebαʔϏεΛ͓͏ (࠶) • Mailgun, Mandrill, Postmark, SendGrid, Amazon SES •
αʔόʔӡ༻Λؙ͛Ͱ͖Δ͠ • ໎ϝʔϧରࡦͬͯ͘ΕΔ • IPΞυϨεͷϨϐϡςʔγϣϯཧͬͯ͘ΕΔ
Ͳ͏ͯ͠Γ͍ͨ ํʹ ͏ͪΐͬͱ౿ΈࠐΜͩ༰Λ"Dark Depths of SMTP"(ٕज़ॻయ4ॳग़)ͱ͍͏ ຊͰॻ͍͍ͯ·͢ ͜ͷۀຊ͕࠷ۙग़ͯͳ͍ͷͰ͓ ͦΒ͘࠷৽Ͱ͢ ͳ͓౦ํཁૉදࢴ͚ͩͰ͢ɻ
Welcome to SMTPপ