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chore: import upstream snapshot with attribution
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paths
paths
**/*.cs
**/*.csx
**/*.csproj
**/appsettings*.json

C# セキュリティ

このファイルは 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
// 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
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。