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Users who had mappings across several Clients in one Organization may lose access through all but the first Client they log in with after migration. Restrict the identity backfill to rows whose Client matches the user's client_id, and check production data for affected users before merging.
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Resolve external userinfo from identities before skipping legacy mappings
When the same provider name and external subject are used in another Client or Organization, this branch deliberately leaves the newly created user without an ExternalIdpMapping. However, ExternalUserInfoService.GetExternalUserInfoAsync still requires a legacy mapping matching the authenticated user's subject and provider, and returns null before fetching the saved external token if none exists. Consequently, login succeeds for the second pool, but /v1/api/external-userinfo always returns 404 for that user, breaking the profile-fetching step exercised by the federation E2E flow. Update that consumer to resolve the provider through EcAuthUserIdentity in this release rather than postponing its migration while creating identity-only users.
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Preserve the exact external subject when hashing identities
If an IdP issues distinct subjects such as account-1 and account-1, trimming makes both produce the same identity key. After either account logs in, ResolveOnceAsync resolves the other account to that existing identity and returns its user without requiring matching or verified email, allowing cross-account authentication. The previous legacy lookup preserved leading whitespace, so this introduces an identity collision for previously distinct accounts. Hash the exact subject, or reject unsupported whitespace explicitly rather than silently normalizing it.
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ご指摘のとおりでした。HashCaseSensitive が Trim していたため、"account-1" と " account-1" が同じ identity になり、メールアドレスの照合なしで別アカウントのユーザーに解決されてしまいます。
92bfd48 で Trim をやめ、sub は加工せずにそのままハッシュするようにしました。backfill の SQL も同じ値になるよう、前後の空白を除外していた条件を外しています。前後に空白を含む sub のハッシュが C# と一致することは、SQL Server 2022 で確認しました。空白だけが違う sub が別ユーザーになることを確かめるテストも追加しています。
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@IdentityProvider/Migrations/20261110045400_AddEcAuthUserIdentity.cs:
- Around line 117-149: 2つ目のEXEC内にあるcand
CTEの対象を、1つ目のUPDATE後に確定したユーザーのclient_idとmapping先Clientが一致する行に限定してください。ecauth_userのclient_idと、JOINで特定したdbo.clientのIDを照合し、一致しない行やclient_idが未確定のユーザーはbackfillせず、遅延移行に委ねてください。
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Claim the legacy user's client pool atomically
When a legacy user has ClientId == null because multiple Clients matched during backfill, concurrent logins through two of those Clients can both read the same unassigned user here. Each request then assigns its own Client and inserts an identity with a different issuer key. Since EcAuthUser has no concurrency token, both saves can succeed: both logins receive the same subject across different pools, the last update determines the user's Client, and subsequent logins through the other identity fail EnsureSamePool. Make the null-to-Client assignment conditional and atomic, and restart resolution if another request has already claimed the user for a different pool.
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概要
EcAuth/EcAuthDocs#122 の識別モデルを導入し、B2C ユーザープールを Client(サイト)単位に分けます。マイグレーションのデプロイ順序 runbook に照らすと、この PR は 3 段リリースの 1 段目(expand) です。新しいコードが新構造(
ecauth_user_identity)を正として読むので、1 リリースでは済みません。UserService/ExternalUserInfoServiceから mapping の読み書きと EF のマッピングを外すexternal_idp_mappingを削除マイグレーション(
AddEcAuthUserIdentity)種別: 追加、制約の緩和、新構造への backfill(expand)。
migrate-and-deployで出せます。migrate の時点で動いているのは旧コードで、追加された列やテーブルを知らないので影響はありません。制約の緩和も旧コードには無害です。ecauth_userclient_id varchar(512) NULLとemail_verified_at datetimeoffset NULLを追加UNIQUE (organization_id, email_hash)を外し、通常の索引(client_id, email_hash)にするecauth_user_identityを新設UNIQUE (issuer_key, external_id)client_id、ecauth_subjectecauth_user.subjectに張り、cascade にするEXEC()で包み、冪等)external_idは C# のExternalIdHasher.HashCaseSensitiveと同じ値にする(UTF-8 → SHA-256 → 大文字 hex、小文字化しない)。T-SQL のLTRIM/RTRIMと C# のTrimで結果が食い違わない値(ASCII 印字可能文字だけで、前後に空白が無い)だけを対象にするDownでは一意制約へ戻さず、非一意の索引を作り直す。この変更の後にできた重複(メールアドレスの無いユーザーが複数など)があると、一意制約の再作成が失敗してロールバックできなくなるためです。feat: B2B 識別子を b2b_user_identity へ分離し発行元で名前空間化する #521 と同じ判断です本番データ(2026-11-10 に SELECT で確認): B2C ユーザーは verify 用の 1 人だけで、backfill の対象になります。
コードの変更
UserService.ResolveFederatedUserAsyncを新設し、設計書「ユーザーの解決と統合のルール」の順に解決しますUserPoolMismatchExceptionで拒否する(external_provider, external_subject)に当たる場合は書かない/v1/auth/callbackは外部 IdP から固定のホストに戻ってくるので、リクエストのテナントがログイン先の Organization と一致するとは限りません。代わりに issuer_key(OpenIdProvider の行、つまり Client)で引き、見つけたユーザーを明示的に照合しますAuthorizationCallbackControlleremail_verified(boolean、または文字列"true")を読みますExternalIdHasher.HashCaseSensitiveを追加しました。OIDC Core §2 ではsubは大文字小文字を区別するので、customer:用の既存のHashと違って小文字化しませんGoogleUserNormalizer/LineUserNormalizer)はつないでいません。OpenIdProviderに IdP の種類を表す列が無く、どれを使うか選べないためですテスト
UserServiceFederatedLoginTests(新規、24 件): 解決順、統合ルール(確認済み同士 / 未確認 / 別 Client / 候補が複数)、遅延移行、別プールの拒否、大文字小文字の区別、メールアドレスの扱い、テナントに依存しないことUserServiceRelationalTests(SQLite): test: B2C フェデレーションのユーザー解決を作り替える前の安全網を張る #582 で固定した一意制約違反の 3 ケースを、正しく解決される期待値へ反転させましたAuthorizationCallbackControllerTests: Client と State の整合の確認を前に移したこと、email_verifiedの読み取り検証
dotnet test: 1256 件合格、失敗 0dotnet ef migrations has-pending-model-changes: 差分なしverify-idempotent-script、playwright のフェデレーション E2E)本番デプロイ
#582 とまとめて
migrate-and-deployで出す予定です。デプロイ後に、本番の B2C ユーザーの identity が backfill されたことを SELECT で確認します。Refs EcAuth/EcAuthDocs#122, EcAuth/EcAuthDocs#164
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Summary by CodeRabbit
新機能
不具合修正
email_verifiedの値を適切に判定し、別 Client の Provider が誤って選ばれる問題を防ぎます。テスト