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
徳丸本輪読会
Search
mcz9mm
July 30, 2017
0
77
徳丸本輪読会
第二回4.5
mcz9mm
July 30, 2017
Tweet
Share
More Decks by mcz9mm
See All by mcz9mm
SwiftUI-List-Pagination
mcz9mm
2
2.3k
ARKit2.0でAppleが伝えたいアプリ体験を考える
mcz9mm
2
1.1k
ゆるく学ぶARKit
mcz9mm
3
1.5k
What’s TCP/UDP?
mcz9mm
0
110
NATサーバーの必要性
mcz9mm
0
110
What’s New in ARKit2.0
mcz9mm
0
110
徳丸本 ログインフォーム
mcz9mm
0
110
arkit+animoji
mcz9mm
0
72
徳丸本8
mcz9mm
0
130
Featured
See All Featured
Responsive Adventures: Dirty Tricks From The Dark Corners of Front-End
smashingmag
252
21k
Balancing Empowerment & Direction
lara
4
680
The Cult of Friendly URLs
andyhume
79
6.6k
Building Adaptive Systems
keathley
43
2.8k
Building a Modern Day E-commerce SEO Strategy
aleyda
43
7.7k
JavaScript: Past, Present, and Future - NDC Porto 2020
reverentgeek
52
5.6k
Why You Should Never Use an ORM
jnunemaker
PRO
59
9.6k
Rails Girls Zürich Keynote
gr2m
95
14k
Producing Creativity
orderedlist
PRO
347
40k
Optimizing for Happiness
mojombo
379
70k
The Psychology of Web Performance [Beyond Tellerrand 2023]
tammyeverts
49
3.1k
The Art of Delivering Value - GDevCon NA Keynote
reverentgeek
15
1.7k
Transcript
ॏཁͳॲཧͷࡍʹࠞೖ͢Δ੬ऑੑ ಙؙձ MataraiKaoru
ॏཁͳॲཧ • ΫϨΧͷܾࡁ • ϝʔϧͷૹ৴ • ޱ࠲͔Βͷૹۚ • ύεϫʔυIDͷมߋ •
etc..
ΫϩεαΠτɾϦΫΤετϑΥʔδΣϦ CSRF ʮ֬ೝʯॲཧ͕ൈ͚͍ͯΔ͚ͩͰউखʹ࣮ߦ͞ ͤΒΕΔةݥੑ͕͋Δ ॏཁͳॲཧͷѱ༻ʹݶΔͷͰඃʹ͋ͬͨར༻ ऀͷݸਓใ౪Ή͜ͱͰ͖ͳ͍
ൃੜՕॴ • CookieͷΈͰηογϣϯཧ͕ߦΘΕ͍ͯΔα Πτ • HTTPೝূɺSSLΫϥΠΞϯτূ໌ॻɺܞଳి ͷIDͷΈͰར༻ऀͷࣝผ͕ߦΘΕ͍ͯΔαΠτ
࣮ߦύλʔϯ • ར༻ऀ͕ରͷαΠτʹϩάΠϯ͍ͯ͠Δ • ߈ܸऀ͕᠘Λ༻ҙ͢Δ • ඃऀ͕᠘ΛӾཡ͢Δ • ᠘ͷJSʹΑΓαΠτʹର͠ɺ৽͍͠ύεϫʔ υ͕POSTϝιουͰૹ৴͞Ε͍ͯΔ
XSSͱͷൺֱ • ઃܭஈ֊ͰରࡦΛΓࠐΉඞཁ͕͋Δ • ೝ͕XSSʹൺ͍ͯ
෦ωοτϫʔΫʹର͢ΔCSRD߈ܸ • WebαΠτ͚ͩͰͳ͘෦ωοτϫʔΫʹ ଓ͞Εͨαʔόʔ߈ܸՄೳ • ϧʔλʔϑΝΠΞʔΥʔϧͷઃఆը໘ ੬ऑੑͷՄೳੑ͕
੬ऑੑ͕ੜ·ΕΔݪҼ Webͷੑ࣭Λར༻ͨ͠ͷ • fromཁૉͷactionଐੑʹͲͷυϝΠϯURL ͰࢦఆͰ͖Δ • Cookieʹอ͞ΕͨηογϣϯIDɺରα Πτʹࣗಈతʹૹ৴͞ΕΔ
ҙਤͨ͠HTTPϦΫΤετ POST /45/45-003.php HTTP/1.1 Referer: http://example.jp/45/45-002.php ~~~~~~~~~~~~ pwd=pass1 ※ϦϑΝϥΛࢀর͢Δ͜ͱͰɺͲ͔͜Βͦͷϖʔδʹཁٻ͕དྷͨͷ͔ΛΔ ͜ͱ͕Ͱ͖Δ
CSRF߈ܸʹΑΔHTTPϦΫΤετ POST /45/45-003.php HTTP/1.1 Referer: http://trap.example.jp/45/45-900.php ~~~~~~~~~~~~ pwd=pass1
ରࡦͦͷ̍ • CSRFରࡦʹඞཁͳϖʔδΛѲ͢Δ ΧʔτʹՃ ೝূ ॅॴ֬ೝ ߪೖ֬ೝ ҙͷϖʔδ ݸਓใฤू
ใ֬ೝ มߋ
ରࡦͦͷ̎ • ਖ਼نར༻ऀͷҙਤͨ͠ϦΫΤετͰ͋Δ͜ͱΛ ֬ೝ͢Δ • ֬ೝํ๏ • τʔΫϯͷຒΊࠐΈ • ύεϫʔυ࠶ೖྗ
• RefererͷνΣοΫ
τʔΫϯͷຒΊࠐΈ • ୈࡾऀ͕Γಘͳ͍ൿີใΛཁٻ͢ΔΑ͏ʹ͢ΕผՄೳ ຒΊࠐΈɿ <input type=“hidden” name=“token” value”<?php echo htmlspecialchars(session_id(),
ENT_COMPAT, ‘UTF-8’); ?>”> ֬ೝɿ if (session_id() !== $_POST[‘token’]) { //Error Handle }
ύεϫʔυͷ࠶ೖྗ • ͷߪೖͳͲʹઌཱͬͯɺར༻ऀͷҙࢥΛ ೦ԡͯ֬͠͠ೝ͢Δ • ڞ༗PCͰଞਓ͕ૢ࡞͍ͯ͠ΔΘ͚Ͱͳ͘ɺ ຊʹਖ਼نͷར༻ऀͰ͋Δ͜ͱΛ֬ೝ͢Δ ্هҎ֎ͷϖʔδঢ়گͰߦ͏ͱඇৗʹ͍ʹ͍͘αΠτʹɾɾɾ
RefererͷνΣοΫ /* ࢀরݩʹΑͬͯৼΓ͚ॲཧ */ $referer = isset($_SERVER['HTTP_REFERER']) ? $_SERVER['HTTP_REFERER'] :
null; if (preg_match("|^https?://[a-zA-Z0-9-]+\.hoge\.jp|", $referer)) { // "xxx.hoge.jp" αΠτ͔ΒͷΞΫηε࣌ͷॲཧɻ } else { /* ΞΫηε࣌ͷॲཧ */ }
อݥతͳରࡦ ରͷར༻ऀʹରͯ͠ॲཧ༰ͷ௨ϝʔϧͷ ૹ৴
End