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Supabase Backend as a Service · レッスン

セキュリティ監査とベストプラクティス

Supabaseプロジェクトのセキュリティ監査を実施し、RLSポリシーを確認して、データとユーザーを保護するベストプラクティスを実装します。

「セキュリティ監査とベストプラクティス」はCoddyKit上の無料Supabase Backend as a Serviceレッスンです。 これはレッスン3/4です。 下記で完全なレッスンを無料で読むことができます。その後、ブラウザ内の組み込みコードエディタと24時間対応のAIチューターでハンズオン演習できます。 これはSupabase Backend as a Service学習パスの一部であり、ウェブとCoddyKitアプリ全体で進捗が同期されます。 Supabase Backend as a Serviceコースには全4レッスンが含まれています。

このレッスンの一部はまだ翻訳されておらず、英語で表示されています。

Why Audit Supabase Security?

A security audit for your Supabase project is a systematic review of its configurations and practices. It's crucial to identify potential vulnerabilities before malicious actors do.

Think of it as a regular health check for your application's security posture. It helps ensure your data remains protected and compliant with security standards.

Core Audit Focus Areas

When performing a security audit on your Supabase project, you should focus on several key areas:

  • Authentication: How users sign up and log in.
  • Row-Level Security (RLS): Data access control within tables.
  • Storage: File access and privacy.
  • Edge Functions: Serverless logic security.
  • Database Configuration: Network access and permissions.

Auditing Auth Settings

Start by reviewing your project's authentication settings in the Supabase dashboard.

  • Password Policy: Is it strong enough (min length, complexity)?
  • MFA: Is Multi-Factor Authentication enabled or encouraged?
  • Sign-up Methods: Are only necessary methods (email, specific OAuth providers) enabled? Disable any unused ones.
  • Rate Limits: Are sign-up/login rate limits configured to prevent brute-force attacks?

Reviewing RLS Policies

Row-Level Security (RLS) is a cornerstone of Supabase data protection. Auditing RLS involves checking every table to ensure policies are correctly applied and grant the minimum necessary access.

You can query pg_policies to get an overview of your RLS policies:

SELECT
  relname AS table_name,
  polname AS policy_name,
  permissive AS is_permissive,
  cmd AS command,
  qual AS policy_condition,
  WITH_CHECK AS with_check_condition
FROM
  pg_policies
WHERE
  schemaname = 'public'
ORDER BY
  table_name, policy_name;

RLS: Principle of Least Privilege

A critical best practice for RLS is the Principle of Least Privilege. This means users or roles should only have access to the data they absolutely need to perform their function, and nothing more.

Review each policy to confirm it's not overly broad. For instance, a user should only see their own data unless explicitly required to see others'.

CREATE POLICY "Users can view their own posts"
ON public.posts FOR SELECT
USING (auth.uid() = user_id);

CREATE POLICY "Users can create their own posts"
ON public.posts FOR INSERT
WITH CHECK (auth.uid() = user_id);

Auditing Storage Policies

Just like RLS for database tables, Supabase Storage buckets also have policies to control file access. Audit these policies carefully.

  • Bucket Privacy: Ensure private buckets cannot be publicly accessed.
  • File RLS: Verify policies on files (e.g., only authenticated users can upload, or only owner can download).
  • Public Buckets: If a bucket is public, confirm this is intentional and doesn't expose sensitive information.

Securing Edge Functions

Supabase Edge Functions are serverless functions that run at the edge. They can be a powerful attack vector if not secured properly.

  • Input Validation: Always validate and sanitize all inputs.
  • Environment Variables: Never store sensitive API keys or credentials directly in function code; use Supabase Secrets.
  • Rate Limiting: Implement rate limiting to prevent abuse.
  • Access Control: Ensure functions are called only by authorized clients or other services.

Database Network & Access

Your PostgreSQL database itself has security configurations that need auditing.

  • Network Restrictions: If possible, use IP allow-listing to restrict database access to specific IP addresses.
  • SSL Enforcement: Ensure all connections to your database require SSL to encrypt data in transit.
  • Role Permissions: Review database roles and their assigned permissions. The anon and authenticated roles should have minimal, well-defined privileges.

Ongoing Security Monitoring

Security auditing isn't a one-time task. Implement continuous monitoring and regular reviews.

  • Supabase Logs: Regularly check your Supabase logs for unusual activity or failed authentication attempts.
  • Automated Scans: Consider integrating automated security scanning tools into your CI/CD pipeline.
  • Security Updates: Stay informed about Supabase security announcements and apply recommended updates promptly.

Security Audit Check

You're performing a security audit on a Supabase project. Which of these are critical areas to review for potential security vulnerabilities?

Lesson Summary

In this lesson, we explored the critical importance of security auditing for your Supabase projects. We covered key areas to focus on, including Authentication, Row-Level Security, Storage, Edge Functions, and core Database configurations.

Remember to apply the Principle of Least Privilege and maintain continuous vigilance through regular reviews and monitoring to keep your application and data secure.

よくある質問

「セキュリティ監査とベストプラクティス」レッスンは無料ですか？

はい。「セキュリティ監査とベストプラクティス」の完全なテキストはこのウェブで無料で読めます。インタラクティブに演習し（組み込みコードエディタと24時間対応のAIチューター）、Supabase Backend as a Serviceコースの残りをアンロックするには、CoddyKit PROにアップグレードしてください。 Supabase Backend as a Serviceコースには全4レッスンが含まれています。

「セキュリティ監査とベストプラクティス」で何を学びますか？

Supabaseプロジェクトのセキュリティ監査を実施し、RLSポリシーを確認して、データとユーザーを保護するベストプラクティスを実装します。 ブラウザで直接実行するハンズオンコードでSupabase Backend as a Serviceを演習し、24時間対応のAIチューターがレッスンを進める中での質問に答えます。

Supabase Backend as a Serviceを始めるのに経験は必要ですか？

事前経験は必要ありません。CoddyKitのSupabase Backend as a Serviceは初級者から上級者向けに構成されているため、ここから始めるか最初から始めて、自分のペースで進むことができます。 これはレッスン3/4です。

「セキュリティ監査とベストプラクティス」レッスンにはどのくらい時間がかかりますか？

ほとんどのCoddyKitレッスンは約5～10分かかります。各レッスンはコンパクトでインタラクティブなので、着実に進歩し、ウェブとアプリ全体で正確に前回の場所から再開できます。

このSupabase Backend as a Serviceレッスンでコードを書いて実行できますか？

はい。すべてのSupabase Backend as a Serviceレッスンに組み込みコードエディタが含まれているため、ブラウザでリアルコードを書いて実行し、即座のAIフィードバックを取得できます。ローカル設定は不要です。

このコースのすべてのレッスン

  1. 環境管理とCI/CD
  2. バックアップ、リストア、ディザスタリカバリ
  3. セキュリティ監査とベストプラクティス
  4. モニタリング、ロギング、オブザーバビリティ
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