README

This extension provides the JWT integration for the Yii framework 2.0 (requires PHP 5.6+). It includes basic HTTP authentication support.

Installation
Dependencies
Basic usage
Creating
Parsing from strings
Validating
Token signature
Hmac
RSA and ECDSA
Yii2 basic template example

Installation

Package is available on Packagist, you can install it using Composer.

composer require yzh52521/yii2-jwt

Dependencies

PHP 5.6+
OpenSSL Extension
lcobucci/jwt 3.3

Basic usage

Add jwt component to your configuration file,

'components' => [
    'jwt' => [
        'class' => \yzh52521\jwt\Jwt::class,
        'constraints' => [
            function () {
                return new \Lcobucci\JWT\Validation\Constraint\LooseValidAt(
                    \Lcobucci\Clock\SystemClock::fromSystemTimezone()
                );
            },
        ],
    ],
],

Configure the authenticator behavior as follows.

namespace app\controllers;

class ExampleController extends \yii\rest\Controller
{

    /**
     * @inheritdoc
     */
    public function behaviors()
    {
        $behaviors = parent::behaviors();
        $behaviors['authenticator'] = [
            'class' => \yzh52521\jwt\JwtHttpBearerAuth::class,
        ];

        return $behaviors;
    }
}

Also, you can use it with CompositeAuth refer to a doc.

Creating

Just use the builder to create a new JWT/JWS tokens:

$now = new DateTimeImmutable();
$algorithm = $this->jwt->getSigner();
$key = $this->jwt->getSignerKey();

$token = Yii::$app->jwt->getBuilder()
   // Configures the issuer (iss claim)
   ->issuedBy('http://example.com')
   // Configures the audience (aud claim)
   ->permittedFor('http://example.org')
   // Configures the id (jti claim)
   ->identifiedBy('4f1g23a12aa')
   // Configures the time that the token was issue (iat claim)
   ->issuedAt($now)
   // Configures the time that the token can be used (nbf claim)
   ->canOnlyBeUsedAfter($now->modify('+1 minute'))
   // Configures the expiration time of the token (exp claim)
   ->expiresAt($now->modify('+1 hour'))
   // Configures a new claim, called "uid"
   ->withClaim('uid', 1)
   // Configures a new header, called "foo"
   ->withHeader('foo', 'bar');
   // Builds a new token
   ->getToken($algorithm, $key);
   
$token->headers(); // Retrieves the token headers
$token->claims(); // Retrieves the token claims
   
echo $token->headers()->get('foo'); // will print "bar"
echo $token->claims()->get('jti'); // will print "4f1g23a12aa"
echo $token->claims()->get('iss'); // will print "http://example.com"
echo $token->claims()->get('uid'); // will print "1"
echo $token->toString(); // The string representation of the object is a JWT string (pretty easy, right?)

Parsing from strings

Use the parser to create a new token from a JWT string (using the previous token as example):

use Lcobucci\JWT\Encoding\CannotDecodeContent;
use Lcobucci\JWT\Token\InvalidTokenStructure;
use Lcobucci\JWT\Token\UnsupportedHeaderFound;
use Lcobucci\JWT\UnencryptedToken;

try {
    /** @var string $jwt JWT token string */
    $token = Yii::$app->jwt->parse($jwt); // Parses from a string
} catch (CannotDecodeContent | InvalidTokenStructure | UnsupportedHeaderFound $e) {
    echo 'Oh no, an error: ' . $e->getMessage();
}

assert($token instanceof UnencryptedToken);

Validating

We can easily validate if the token is valid (using the previous token as example):

use \Lcobucci\JWT\Validation\Constraint\IssuedBy;

if (!Yii::$app->jwt->validate($token, new IssuedBy('http://example.com'))) {
    echo 'Invalid token (1)!', PHP_EOL; // will not print this
}

if (!Yii::$app->jwt->validate($token, new IssuedBy('http://example.org'))) {
    echo 'Invalid token (1)!', PHP_EOL; // will print this
}

Available constraints

\Lcobucci\JWT\Validation\Constraint\IdentifiedBy: verifies if the claim jti matches the expected value
\Lcobucci\JWT\Validation\Constraint\IssuedBy: verifies if the claim iss is listed as expected values
\Lcobucci\JWT\Validation\Constraint\PermittedFor: verifies if the claim aud contains the expected value
\Lcobucci\JWT\Validation\Constraint\RelatedTo: verifies if the claim sub matches the expected value
\Lcobucci\JWT\Validation\Constraint\SignedWith: verifies if the token was signed with the expected signer and key
\Lcobucci\JWT\Validation\Constraint\StrictValidAt: verifies presence and validity of the claims iat, nbf, and exp (supports leeway configuration)
\Lcobucci\JWT\Validation\Constraint\LooseValidAt: verifies the claims iat, nbf, and exp, when present (supports leeway configuration)
\Lcobucci\JWT\Validation\Constraint\HasClaimWithValue: verifies that a custom claim has the expected value (not recommended when comparing cryptographic hashes)

Important

You have to configure \yzh52521\jwt\Jwt::$constraints informing all claims you want to validate the token by Yii::$app->jwt->loadToken(), this method also called inside \sizeg\jwt\JwtHttpBearerAuth.

Token signature

We can use signatures to be able to verify if the token was not modified after its generation. This extension implements Hmac, RSA and ECDSA signatures (using 256, 384 and 512).

Important

Do not allow the string sent to the Parser to dictate which signature algorithm to use, or else your application will be vulnerable to a critical JWT security vulnerability.

The examples below are safe because the choice in Signer is hard-coded and cannot be influenced by malicious users.

Hmac

Hmac signatures are really simple to be used.

You may configure component:

'components' => [
    'jwt' => [
        'class' => \yzh52521\jwt\Jwt::class,
        'signer' => \yzh52521\jwt\JwtSigner::HS256,
        'signerKey' => \yzh52521\jwt\JwtKey::PLAIN_TEXT,
        'signerKeyContents' => random_bytes(32),
        'signerKeyPassphrase' => 'secret',
        'constraints' => [
            function () {
                // Verifies the claims iat, nbf, and exp, when present (supports leeway configuration)
                return new \Lcobucci\JWT\Validation\Constraint\LooseValidAt(
                    \Lcobucci\Clock\SystemClock::fromSystemTimezone()
                );
            },
            function () {
                // Verifies if the token was signed with the expected signer and key
                return new \Lcobucci\JWT\Validation\Constraint\SignedWith(
                    Yii::$app->jwt->getSigner(),
                    Yii::$app->jwt->getSignerKey()
                );
            },
         ],
    ],
],

use \Lcobucci\JWT\Validation\Constraint\SignedWith;

$now = new DateTimeImmutable();

$algorithm = $this->jwt->getSigner(\yzh52521\jwt\JwtSigner::HS256);
// ... and key
$contents = random_bytes(32);
$passphrase = 'secret';
$key = $this->jwt->getSignerKey(\yzh52521\jwt\JwtKey::PLAIN_TEXT, $contents, $passphrase);

$token = Yii::$app->jwt->getBuilder()
    // Configures the issuer (iss claim)
    ->issuedBy('http://example.com')
    // Configures the audience (aud claim)
    ->permittedFor('http://example.org')
    // Configures the id (jti claim)
    ->identifiedBy('4f1g23a12aa')
    // Configures the time that the token was issue (iat claim)
    ->issuedAt($now)
    // Configures the time that the token can be used (nbf claim)
    ->canOnlyBeUsedAfter($now->modify('+1 minute'))
    // Configures the expiration time of the token (exp claim)
    ->expiresAt($now->modify('+1 hour'))
    // Configures a new claim, called "uid"
    ->withClaim('uid', 1)
    // Configures a new header, called "foo"
    ->withHeader('foo', 'bar')
    // Builds a new token
    ->getToken($algorithm, $key);
    
if (!Yii::$app->jwt->validate($token, new SignedWith(
    Yii::$app->jwt->getSigner(\yzh52521\jwt\JwtSigner::HS256),
    Yii::$app->jwt->getSignerKey(JwtKey::PLAIN_TEXT, $contents, $passphrase)
))) {
    echo 'Invalid token (1)!', PHP_EOL; // will not print this
}

if (!Yii::$app->jwt->validate($token, new SignedWith(
    Yii::$app->jwt->getSigner(\yzh52521\jwt\JwtSigner::HS256),
    Yii::$app->jwt->getSignerKey(JwtKey::PLAIN_TEXT, random_bytes(32), 'other-secret')
))) {
    echo 'Invalid token (1)!', PHP_EOL; // will print this
}

RSA and ECDSA

RSA and ECDSA signatures are based on public and private keys so you have to generate using the private key and verify using the public key:

use \Lcobucci\JWT\Validation\Constraint\SignedWith;

$now = new DateTimeImmutable();

// you can use 'ES256' if you're using ECDSA keys
$algorithm = Yii::$app->jwt->getSigner(\yzh52521\jwt\JwtSigner::RS256);
$privateKey = Yii::$app->jwt->getSignerKey(\yzh52521\jwt\JwtKey::FILE, 'file://{path to your private key}');

$token = Yii::$app->jwt->getBuilder()
    // Configures the issuer (iss claim)
    ->issuedBy('http://example.com')
    // Configures the audience (aud claim)
    ->permittedFor('http://example.org')
    // Configures the id (jti claim)
    ->identifiedBy('4f1g23a12aa')
    // Configures the time that the token was issue (iat claim)
    ->issuedAt($now)
    // Configures the time that the token can be used (nbf claim)
    ->canOnlyBeUsedAfter($now->modify('+1 minute'))
    // Configures the expiration time of the token (exp claim)
    ->expiresAt($now->modify('+1 hour'))
    // Configures a new claim, called "uid"
    ->withClaim('uid', 1)
    // Configures a new header, called "foo"
    ->withHeader('foo', 'bar')
    // Builds a new token
    ->getToken($algorithm, $privateKey);

$publicKey = Yii::$app->jwt->getSignerKey(\yzh52521\jwt\JwtKey::FILE, 'file://{path to your public key}');

var_dump(Yii::$app->jwt->validate($token, new SignedWith(
    Yii::$app->jwt->getSigner(\yzh52521\jwt\JwtSigner::RS256),
    Yii::$app->jwt->getSignerKey(JwtKey::FILE, $publicKey)
))); // true when the public key was generated by the private one =)

It's important to say that if you're using RSA keys you shouldn't invoke ECDSA signers (and vice-versa), otherwise sign() and verify() will raise an exception!

Yii2 basic template example

Basic scheme

Client send credentials. For example, login + password
Backend validate them
If credentials is valid client receive token
Client store token for the future requests

Step-by-step usage example

Create Yii2 application

In this example we will use basic template, but you can use advanced template in the same way.
```
composer create-project --prefer-dist --stability=dev yiisoft/yii2-app-basic yii2-jwt-test
```
Install component
```
composer require yzh52521/yii2-jwt
```

Add to config/web.php into components section

$config = [
    'components' => [
        // other default components here..
        'jwt' => [
            'class' => \yzh52521\jwt\Jwt::class,
            'constraints' => [
                function () {
                    return new \Lcobucci\JWT\Validation\Constraint\LooseValidAt(
                        \Lcobucci\Clock\SystemClock::fromSystemTimezone()
                    );
                },
            ],
        ],
    ],
];

Change method app\models\User::findIdentityByAccessToken()

    /**
     * {@inheritdoc}
     * @param \Lcobucci\JWT\Token $token
     */
    public static function findIdentityByAccessToken($token, $type = null)
    {
        foreach (self::$users as $user) {
            if ($user['id'] === (string) $token->claims()->get('uid')) {
                return new static($user);
            }
        }

        return null;
    }

Create controller

   <?php

   namespace app\controllers;

   use yzh52521\jwt\Jwt;
   use yzh52521\jwt\JwtHttpBearerAuth;
   use Yii;
   use yii\rest\Controller;

   class RestController extends Controller
   {
       /**
        * @inheritdoc
        */
       public function behaviors()
       {
           $behaviors = parent::behaviors();
           $behaviors['authenticator'] = [
               'class' => JwtHttpBearerAuth::class,
               'optional' => [
                   'login',
               ],
           ];

           return $behaviors;
       }

       /**
        * @return \yii\web\Response
        */
       public function actionLogin()
       {
           $now = new DateTimeImmutable();
           $algorithm = $this->jwt->getSigner();
           $key = $this->jwt->getSignerKey();

           /** @var Jwt $jwt */
           $jwt = Yii::$app->jwt;
        
           $token = Yii::$app->jwt->getBuilder()
               // Configures the issuer (iss claim)
               ->issuedBy('http://example.com')
               // Configures the audience (aud claim)
               ->permittedFor('http://example.org')
               // Configures the id (jti claim)
               ->identifiedBy('4f1g23a12aa')
               // Configures the time that the token was issue (iat claim)
               ->issuedAt($now)
               // Configures the expiration time of the token (exp claim)
               ->expiresAt($now->modify('+1 hour'))
               // Configures a new claim, called "uid"
               ->withClaim('uid', 100)
               // Builds a new token
               ->getToken($algorithm, $key);

        return $this->asJson([
            'token' => $token->toString(),
        ]);
    }

    /**
     * @return \yii\web\Response
     */
    public function actionData()
    {
        return $this->asJson([
            'success' => true,
        ]);
    }
}

Send simple login request to get token. Here we does not send any credentials to simplify example. As we specify in authenticator behavior action login as optional the authenticator skip auth check for that action.
First of all we try to send request to rest/data without token and getting error Unauthorized
Then we retry request but already adding Authorization header with our token

yzh52521 / yii2-jwt

Maintainers

Details

README

Table of contents

Installation

Dependencies

Basic usage

Creating

Parsing from strings

Validating

Available constraints

Important

Token signature

Important

Hmac

RSA and ECDSA

Yii2 basic template example

Basic scheme

Step-by-step usage example