February 2013
Intermediate to advanced
380 pages
7h 45m
Japanese
Content preview from Nodeクックブック
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27
レシピ 1.5 ファイルシステムをハッキングから守る
きます。
先の例では
-serve
という文字列を追加しましたが、この方法は問題の根本を解決していませ
ん。これでは問題の表面を取り繕っているだけで、ヌルバイト攻撃によって簡単に突破されてし
まいます。この攻撃の鍵は、
URL
エンコードでヌルバイトを表す文字列
%00
です。
Node
は
%00
を文字列として認識します。このパス文字列に
-serve
を付与して
fs.readFile
に渡すと、パス文
字列は
OS
によって解釈され、ヌルバイト文字以降の
/index.html-serve
は無視されてしまいま
す。したがって
OS
は
../insecure_server.js
にアクセスを試みます。
防御策としては、正規表現で
../
文字列を取り除いてしまう方法や、ヌルバイト自体を検出して
400 Bad Request
レスポンスを返す方法があります。しかし
path.normalize
を使えば、これらを
個別に実装する必要はありません。相対パスも、ヌルバイトもすべて取り除いてくれます。
ミニレシピでは、スタティックファイルの配信時にサーバを守る方法をもう少し見ていきます。
関連するレシピ
●
「レシピ
7.2
crypto
モジュールでパスワードをハッシュ化する」
●
「レシピ
7.4
HTTPS
サーバを立てる」
●
「レシピ
7.5
クロスサイトリクエストフォージェリを予防する」
●
「レシピ
10.1
アプリケーションを
80
番ポートで待機させる」
ミニレシピ
1.5.1
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.