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20150604 jaws-ug-sapporo15-lt-kaji
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Hiroyuki Kaji
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2015/6/4 JAWS-UG 札幌 第15回 LTの資料です。
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20150604 jaws-ug-sapporo15-lt-kaji
1.
AWSでのDDoS対策について アレコレ調べてみた JAWS-UG 札幌支部 第15回勉強会 1
2.
自己紹介 梶 浩幸(かじ ひろゆき) クラスメソッド株式会社 AWSコンサルティング部 ソリューションアーキテクト ブログ http://dev.classmethod.jp/author/kaji-hiroyuki/ 2
3.
DDoS攻撃とは • サーバーなどに大量 のパケットを送り付 けて、サービスを提 供できない状態にし てしまう攻撃のこと。 図:wikipediaより 3
4.
質問 サーバのログを見て、規模が小さくても DDoS(DoS)らしき形跡を見た経験があ る人はどれぐらいいらっしゃいますか?? 4
5.
どんな攻撃 • インフラ攻撃(Layer3/4) 78% •
Syn flood、UDP Amp flood • アプリケーション攻撃(Layer7)22% • SQLインジェクション、XSS 5
6.
AWS側で何かしてくれるの? • AWSは、AWSプラットフォームへのDoS / DDoS攻撃を軽減するように独自の技術を使 用。 •
しかし、実際のユーザトラフィックとの干渉 を避けるために、積極的に個々のAmazon EC2インスタンスに影響を与えるネットワー クトラフィックをブロックしない。 6 参考元:AWS Security Best Practices
7.
DDoSからの保護・軽減 • Firewall/SecurityGroup/ NetworkACL/ホストベースFirewall • WAF(Web
Application Firewall) • ホストベースIDS/IPS • 帯域制御 7
8.
どうやってDDoS軽減するか? • 回復力のある構成(適応性/スケーラブル/階層) • 積極的に複数の技術を採用 •
攻撃可能なポイントを最小に • 通常のリソース状態を把握しておく • スケール可能にしておく • スケールするのが大変な高価な資源は保護 • DDoS攻撃に対処するための計画 8
9.
9 Route53+CloudFront+Scale •Route53でDNS負荷分散 •CloudFrontで正しくないプロトコルによる接続を除外 •オートスケールして受け流す
10.
10 WAFをELBでサンドイッチ • WAFは検査し、アプリケーション層のトラフィックにフィルタを適用 • OWASP
Top 10の防御 • ホワイトリスト・ブラックリスト
11.
私のちょっとした懸念点 • DDoSされたら、CloudFrontの課金が膨 らむ?・・ • EC2でWAF構築して面倒みるの・・ 11
12.
知らなかったCloudFront • CloudFrontは、AWS製のDDoS緩和シス テムをインラインで導入 • 全てのパケットは検査されスコアリングされる •
全てのエッジロケーションの前に緩和システム が入っている • AWS Summit Tokyo 2015 TE-09 Amazon CloudFront から Edge Services へ ∼CDN を再定義する AWS の新たな取り組み∼ 12
13.
13 クラウド型WAF •DNSの設定変更で導入できるものが多い •WAFのスケールもおまかせ
14.
クラウド型WAF • アプリケーション保護も必要ならコレかも • EC2インスタンスは防御できないので注 意!! •
いろいろなメーカー • scutum、Imperva Incapsula、 Akamai、F5 14
15.
まとめ • アタック対象を少なくして、スケールし許容で きる構成に • Route53/CloudFrontで保護 •
重要な情報資産ならWAFを検討 • クラウド型WAFは手間が少ない • CloudFrontがCDN+WAFになったら、最高 だなぁ。(期待) • 他の手法、是非教えて下さい。15
16.
参考資料 • 本日の資料作成に際し参考にさせて頂いた資料 • AWS
re:Invent 2014 ¦ (SEC307) Building a DDoS-Resilient Architecture with Amazon Web Services • AWS Security Best Practices(50ペー ジ) http://media.amazonwebservices.com/ AWS_Security_Best_Practices.pdf • Web Application Firewall 読本 http://www.ipa.go.jp/security/vuln/waf.html 16
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