Flutterアプリの難読化とエラーレポート(iOS)

"Flutter Meetup Tokyo #6"で使った資料です。
https://flutter-jp.connpass.com/event/105834/

Transcript

1. FlutterΞϓϦͷ೉ಡԽͱ ΤϥʔϨϙʔτ(iOS) Hiroki Matsue Dec 6th, 2018 Flutter Meetup Tokyo #6
2. Hiroki Matsue (@macs_6)
3. FlutterͰIIJmio޲͚ʹ ʮΈ͓εΠονʯΛ ϦϦʔε
5. [࣭໰] FlutterͰΞϓϦΛ ϦϦʔε͍ͯ͠Δਓʁ
6. [࣭໰] ϦϦʔεલʹ ೉ಡԽͨ͠ਓʁ
7. ϦϦʔεؔ࿈ͷυΩϡϝϯτ https://flutter.io/docs/deployment/ios
10. ࠷ॳʹॻ͍͚ͯ͋ͬͨͲ ݟམͱͯͨ͠ (AndroidͷProGuardରԠͯͯ͠ؾ͍ͮͨ)
11. ͪͳΈʹ
12. (ϦϦʔεؔ࿈Ͱ୤ઢ) ΞΠίϯ࡞੒͸"flutterlaunchericons"࢖͏ͱ 1ͭͷը૾͔Β͍͍ײ͡ʹ࡞ͬͯ͘ΕΔ
13. iOS͸Dartίʔυ෦෼͕ ೉ಡԽͷର৅
14. ΍Δ͜ͱ͸build࣌ʹ ΦϓγϣϯΛ͚ͭΔ͚ͩ (Կނ͔ॳظঢ়ଶͰ͸ରԠ͞Εͯͳ͍ ) https://github.com/flutter/flutter/wiki/Obfuscating-Dart-Code
15. <ProjectRoot>/ios/Flutter/Release.xcconfig EXTRA_GEN_SNAPSHOT_OPTIONS=--obfuscate
16. # <ProjectRoot>/packages/flutter_tools/bin/xcode_backend.sh local extra_gen_snapshot_options_or_none="" if [[ -n "$EXTRA_GEN_SNAPSHOT_OPTIONS" ]]; then extra_gen_snapshot_options_or_none="--extra-gen-snapshot-options=$EXTRA_GEN_SNAPSHOT_OPTIONS" fi ... RunCommand "${FLUTTER_ROOT}/bin/flutter" --suppress-analytics \ ${verbose_flag} \ build aot \ --output-dir="${build_dir}/aot" \ --target-platform=ios \ --target="${target_path}" \ --${build_mode} \ --ios-arch="${archs}" \ ${local_engine_flag} \ ${track_widget_creation_flag} \ ${extra_gen_snapshot_options_or_none}
17. # <ProjectRoot>/packages/flutter_tools/bin/xcode_backend.sh local extra_gen_snapshot_options_or_none="" if [[ -n "$EXTRA_GEN_SNAPSHOT_OPTIONS" ]]; then extra_gen_snapshot_options_or_none="--extra-gen-snapshot-options=$EXTRA_GEN_SNAPSHOT_OPTIONS" fi ... RunCommand "${FLUTTER_ROOT}/bin/flutter" --suppress-analytics \ ${verbose_flag} \ build aot \ --output-dir="${build_dir}/aot" \ --target-platform=ios \ --target="${target_path}" \ --${build_mode} \ --ios-arch="${archs}" \ ${local_engine_flag} \ ${track_widget_creation_flag} \ ${extra_gen_snapshot_options_or_none}
18. xcode_backend.sh ͱ͸ʁ Build PhaseͷRun ScriptͰ࢖ΘΕ͍ͯΔεΫϦϓτ Xcode͔Β΋Dartίʔυ͕build͞ΕΔͷ͸͜Εͷ͓͔͛
19. (୤ઢ2) طଘΞϓϦʹFlutterΛಋೖ͢Δ࣌͸ xcode_backend.sh embed Add2AppϘʔυ্Ͱઈࢍ։ൃத
20. ͜ΕͰϏϧυ͢Ε͹ ೉ಡԽ׬ྃʂ Χϯλϯʂ
21. ೉ಡԽͷ֬ೝํ๏ʁ
22. App.frameworkΛ֬ೝ͢Δ $ strings build/ios/Release-iphoneos/Runner.app/Frameworks/App.framework/App ... get:_vxa@7048458x get:_aLa@9040228x get:_DLa@7048458x ...
23. ೉ಡԽͷલޙͰൺֱ before get:_count@7048458 get:_onData@9040228 get:_isSubscribed@7048458 after get:_vxa@7048458x get:_aLa@9040228x get:_DLa@7048458x
24. Dartίʔυ͕೉ಡԽ͞Εͨ
25. ...ϦϦʔεޙͷ͋Δ೔
27. SentryͷΤϥʔϨϙʔτ΋ ೉ಡԽ͞ΕͯΔ
28. ೉ಡԽલͷΤϥʔϨϙʔτ
29. ։ൃத͸ؾ͔ͮͳ͔ͬͨ
30. ೉ಡԽͷલޙͰൺֱ before main.dart in SampleApp.build at line 48 after SEd in bZ.opa at line 48
31. ࣗ෼΋ಡΊͳ͍
32. ϦϦʔεࡁΞϓϦͷ Τϥʔ΋ݟ͍ͨ
33. mapϑΝΠϧΛग़ྗ͢Δ ઌ΄ͲͷυΩϡϝϯτʹ͋ͬͨઃఆ EXTRA_GEN_SNAPSHOT_OPTIONS=--obfuscate mapϑΝΠϧΛग़ྗ͢ΔઃఆΛ௥Ճ EXTRA_GEN_SNAPSHOT_OPTIONS=--obfuscate, ɹ --save-obfuscation-map=ios_dart_symbols_${FLUTTER_BUILD_NUMBER}.json
34. ग़ྗ͞ΕͨmapϑΝΠϧ $ cat ios_dart_symbols_5.json ... "_BuildJsonListener","_Gf", "CustomSymbolRenderer","cs", "devicePixelRatio","saa" ... ͜ΕΛࢀর͢Ε͹ಡΊΔ !
35. աڈʹϦϦʔεͨ͠ΞϓϦͷmapϑΝΠϧʁ ࢼͨ͠ͱ͜Ζɺ ੜ੒ݩͷίʔυ͕ಉ͡Ͱ͋Ε͹map΋ಉ͡ʹͳͬͨ
36. ·ͱΊ
37. ·ͱΊ • FlutterͩͱiOSͰ΋Dartίʔυͷ೉ಡԽ࡞ۀ͕͋Δ • stringsίϚϯυͰνΣοΫ͢Δͷָ͕ • mapϑΝΠϧ΋ग़ྗ͓ͯ͘͠ͱSentryղಡʹ࢖͑Δ # before main.dart in SampleApp.build at line 48 # after SEd in bZ.opa at line 48
38. Έ͓εΠονɺੋඇ͝ར༻͍ͩ͘͞
39. Thanks