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chore: import upstream snapshot with attribution
2026-07-13 11:55:55 +08:00

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---
paths:
- "**/*.cs"
- "**/*.csx"
- "**/*.csproj"
- "**/appsettings*.json"
---
# C# セキュリティ
> このファイルは [common/security.md](../common/security.md) を C# 固有のコンテンツで拡張します。
## シークレット管理
- API キー、トークン、接続文字列をソースコードに絶対にハードコードしない
- ローカル開発には環境変数とユーザーシークレットを使用し、本番環境ではシークレットマネージャーを使用する
- `appsettings.*.json` に実際の認証情報を含めない
```csharp
// BAD
const string ApiKey = "sk-live-123";
// GOOD
var apiKey = builder.Configuration["OpenAI:ApiKey"]
?? throw new InvalidOperationException("OpenAI:ApiKey is not configured.");
```
## SQL インジェクション対策
- ADO.NET、Dapper、EF Core でのパラメータ化クエリを常に使用する
- ユーザー入力を SQL 文字列に絶対に連結しない
- 動的クエリ構成を使用する前に並べ替えフィールドとフィルタ演算子を検証する
```csharp
const string sql = "SELECT * FROM Orders WHERE CustomerId = @customerId";
await connection.QueryAsync<Order>(sql, new { customerId });
```
## 入力バリデーション
- アプリケーション境界で DTO を検証する
- データアノテーション、FluentValidation、または明示的なガード句を使用する
- ビジネスロジックを実行する前に無効なモデル状態を拒否する
## 認証と認可
- カスタムトークン解析の代わりにフレームワークの認証ハンドラーを優先する
- エンドポイントまたはハンドラー境界で認可ポリシーを適用する
- 生のトークン、パスワード、PII を絶対にログに記録しない
## エラーハンドリング
- クライアント向けの安全なメッセージを返す
- 詳細な例外はサーバー側で構造化されたコンテキストと共にログに記録する
- API レスポンスにスタックトレース、SQL テキスト、ファイルシステムパスを露出しない
## 参考
より広範なアプリケーションセキュリティレビューチェックリストについてはスキル: `security-review` を参照。