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GraphQL JSON Web Token authenticator

This module provides a JWT-interface for creating JSON Web Tokens for authentication.

Installation

composer require firesphere/graphql-jwt

The default config is available in _config\config.yml.

In order to securely process and store data via JWT, you need to set a secret key in your .env file:

JWT_SIGNER_KEY="[your secret key]"

A quick way to generate a secure random value value for JWT_SIGNER_KEY is through a PHP CLI command:

php -r 'echo substr(base64_encode(random_bytes(64)), 0, 64) . "\n";'

You can also use public/private key files.

JWT_SIGNER_KEY="./path/to/private.key"
JWT_PUBLIC_KEY="./path/to/public.key"

Note: Relative paths will be relative to your BASE_PATH (prefixed with ./)

Currently, only RSA keys are supported. ECDSA is not supported. The keys in the test-folder are generated by an online RSA key generator.

The signer key for HMAC can be of any length (keys longer than B bytes are first hashed using H). However, less than L bytes is strongly discouraged as it would decrease the security strength of the function.. Thus, for SHA-256 the signer key should be between 16 and 64 bytes in length.

The keys in tests/keys should not be trusted!

Configuration

Since admin/graphql is reserved exclusively for CMS graphql access, it will be necessary for you to register a custom schema for your front-end application, and apply the provided queries and mutations to that.

For example, given you've decided to create a schema named frontend at the url /api

---
Name: my-graphql-schema
---
SilverStripe\GraphQL\Manager:
  schemas:
    frontend:
      types:
        MemberToken: 'Firesphere\GraphQLJWT\Types\MemberTokenTypeCreator'
        Member: 'Firesphere\GraphQLJWT\Types\MemberTypeCreator'
      mutations:
        createToken: 'Firesphere\GraphQLJWT\Mutations\CreateTokenMutationCreator'
        refreshToken: 'Firesphere\GraphQLJWT\Mutations\RefreshTokenMutationCreator'
      queries:
        validateToken: 'Firesphere\GraphQLJWT\Queries\ValidateTokenQueryCreator'
---
Name: my-graphql-injections
---
SilverStripe\Core\Injector\Injector:
  SilverStripe\GraphQL\Manager.frontend:
    class: SilverStripe\GraphQL\Manager
    constructor:
      identifier: frontend
  SilverStripe\GraphQL\Controller.frontend:
    class: SilverStripe\GraphQL\Controller
    constructor:
      manager: '%$SilverStripe\GraphQL\Manager.frontend'
---
Name: my-graphql-routes
---
SilverStripe\Control\Director:
  rules:
    api:
      Controller: '%$SilverStripe\GraphQL\Controller.frontend'
      Stage: Live

Log in

To generate a JWT token, send a login request to the createToken mutator:

mutation {
  createToken(Email: "admin", Password: "password") {
    Token, // ...request or you won't have a token
    ID,
    FirstName,
    Surname
  }
}

Validate token

If you have an app and want to validate your token, you can address the validateToken method:

query validateToken {
  validateToken {
    Valid
    Message
    Code
  }
}

It only needs to call the endpoint. The token should be in the header, via your middleware for the request, as a Authorization: Bearer [token]. If the token is valid, you'll get a response like this:

{
  "data": {
    "validateToken": {
      "Valid": true,
      "Message": "",
      "Code": 200,
      "__typename": "ValidateToken"
    }
  }
}

If the token is invalid, Valid will be false.

Anonymous tokens

Although not advised, it's possible to use anonymous tokens. When using an anonymous authenticator, SilverStripe will generate a default database record in the Members table with the Email anonymous and no permissions by default.

To enable anonymous tokens, add the following to your configuration .yml:

SilverStripe\Core\Injector\Injector:
  Firesphere\GraphQLJWT\Mutations\CreateTokenMutationCreator:
    properties:
      CustomAuthenticators:
        - Firesphere\GraphQLJWT\Authentication\AnonymousUserAuthenticator

You can then create an anonymous login with the below query.

mutation {
  createToken(Email: "anonymous") {
    Token
  }
}

Note: If the default anonymous authenticator doesn't suit your purposes, you can inject any other core SilverStripe authenticator into CustomAuthenticators.

Warning: The default AnonymousUserAuthenticator is not appropriate for general usage, so don't register this under the core Security class!

Enable CORS

To use JWT, CORS needs to be enabled. This can be done by adding the following to your configuration .yml:

SilverStripe\GraphQL\Controller:
  cors:
    Enabled: true
    Allow-Origin: "*"
    Allow-Headers: "Authorization, Content-Type"
    Allow-Methods: "GET, POST, OPTIONS"
    Max-Age: 86400 # ...in seconds

Usage

After logging in, you will receive a token which can be used for further requests. This token should be in the header of the request with the Bearer as signature:

Authorization: Bearer [token]

Prefix

A prefix can be optionally associated with the unique identifier of a JWT record. This can make it easier to distinguish JWT records created in different contexts, e.g. on a specific domain or environment type. It is not required for security purposes.

JWT_PREFIX="[your secret prefix]"

Security

Currently, the default method for encrypting the JWT is with SHA256. JWT is signed with multiple factors; including the host, audience (app/remote user), a secret key and a timeframe within which the token is valid. Only one device can be logged in at the time.

Supported services

By default, JWT only supports login. As it's tokens can not be disabled, nor used for password changes or resets.

Caveats

When using php under CGI/FastCGI mode with Apache, the Authorization header might not work correctly, see issue#15. The workaround is simple, just add SetEnvIf Authorization .+ HTTP_AUTHORIZATION=$0 in your .htaccess file (refer).

Examples

A Postman collection can be found in the extra folder.

Cow?

Of course!

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