Rails 5.2 Generate Master Key

  1. Rails 5.2 Master Key
  2. Rails 5.2 Generate Master Key Code
  3. Rails Generate Model Reference
  4. Rails 5.2 Generate Master Key Tool

Apr 11, 2019  So you don't need a master.key file as long as you have the RAILSMASTERKEY environment variable. Rails will check for the env var first and use that if it exists, otherwise it falls back to the file. You should be able to set the env var using Gitlab and then you'd just need to make sure the env var from Gitlab is accessible in your docker image. No need to write anything to master.key this way. Rails 5.2 ships with a new DSL that allows you to configure a Content Security Policy for your application. You can configure a global default policy and then override it on a per-resource basis and even use lambdas to inject per-request values into the header such as account subdomains in a multi-tenant.

If your master.key has been compromised, you might want to regenerate it.

No key regeneration feature at the moment.We have to do it manually.

  1. Copy content of original credentials rails credentials:show somewhere temporarily.
  2. Remove config/master.key and config/credentials.yml.enc
  3. Run EDITOR=vim rails credentials:edit in the terminal: This command will create a new master.key and credentials.yml.enc if they do not exist.
  4. Paste the original credentials you copied (step 1) in the new credentials file (and save + quit vim)
  5. Add and Commit the file config/credentials.yml.enc

Important

  • Make sure config/master.key is listed in .gitignore and NOT tracked by git.
  • The command EDITOR=vim rails credentials:edit might not work if you require credential value in some file (initializers or database.yml).I had the problem with devise.rb. I just uncommented the line secret_key = .. just the time to run the command to regenerate the credentials file, and then commented the line out again.
  • If you want to use Sublime to edit the credentials, you can replace the command EDITOR=vim rails credentials:edit by EDITOR='/Applications/Sublime Text.app/Contents/SharedSupport/bin/subl -w' rails credentials:edit

source: https://blog.eq8.eu/til/rails-52-credentials-tricks.html

Rails5.2では新規アプリを作成した時にconfig/secrets.ymlが生成されず、代わりにconfig/credentials.yml.encが生成されるようになりました。

credentials.yml.encの使い方について調べた内容を備忘録として投稿させていただきます。

ファイルを直接編集することはできない

credentials.yml.encの内容は暗号化されてるため、エディタなどで直接ファイルを開いて編集することはできません。

credentials.yml.encを編集するためにはrails credentials:editコマンドを実行します。

EDITOR未指定の場合

credentials.yml.encの編集には環境変数：EDITORに指定されてるエディタが利用されます。環境変数：EDITORが未設定の状態でrails credentials:editを実行した場合は以下のようなメッセージが表示されます。

EDITORの指定方法

Generate

Rails 5.2 Master Key

viを利用してcredentials.yml.encを編集する場合は、環境変数：EDITORにviを指定してrails credentials:editコマンドを実行します。

.bash_profileなどに環境変数：EDITORを指定しておけば、EDITOR='xxx'の指定は不要になります。

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credentials.yml.encに設定した資格情報を取り出すにはRails.application.credentials.xxxを指定します。

Rails 5.2 Generate Master Key Code

例：rails consoleを利用したcredentials.yml.encの読み取り

config/master.key

credentials.yml.encはmaster keyを利用して暗号化・復号されます。
デフォルトのmaster keyの値はconfig/master.keyに記載されてます。

Rails5.2が生成する.gitignoreでは/config/master.keyが標準で指定されており、master keyがGitリポジトリに含まれないように配慮されてます。

/config/master.keyが存在しない状態でrails credentials:editコマンドを実行した場合、/config/master.keyが生成されます。

Rails Generate Model Reference

環境変数：RAILS_MASTER_KEY

Key

/config/master.keyが共有できない環境ではmaster keyを環境変数：RAILS_MASTER_KEYで指定します。

/config/master.keyが存在せず、環境変数：RAILS_MASTER_KEYでmaster keyが設定されてない場合はcredentials.yml.enc内のデータは読み取れません。

/config/master.key`が存在しなくても、環境変数：RAILS_MASTER_KEYでmaster keyを設定した場合はcredentials.yml.enc内のデータが読み取れるようになります。

Windows 8.1 pro serial key 64 bit generator. 本番環境ではmaster keyの指定漏れを防ぐためにconfig/environments/production.rbでconfig.require_master_key = trueを有効化することが推奨されてるようです。

Rails 5.2 Generate Master Key Tool

上記オプションが有効の場合、master keyが指定されてない状態でサーバ起動を実行しようとするとエラーが発生します。