SSO - Single Sign-On.
Server - page which works as SSO server, handles authentications, stores all sessions data.
Broker - your page which is used visited by clients/users.
Client/User - your every visitor.

How it works?

Client visits Broker and unique token is generated. When new token is generated we need to attach Client session to his session in Broker so he will be redirected to Server and back to Broker at this moment new session in Server will be created and associated with Client session in Broker's page. When Client visits other Broker same steps will be done except that when Client will be redirected to Server he already use his old session and same session id which associated with Broker#1.

Installation

Server

Install this package using composer.

$ composer require acidwave/laravel-sso

Copy config file to Laravel project config/ folder.

$ php artisan vendor:publish --provider="AcidWave\LaravelSSO\SSOServiceProvider"

Create table where all brokers will be saved.

$ php artisan migrate --path=vendor/acidwave/laravel-sso/database/migrations

Edit your app/Http/Kernel.php by adding queued cookies middleware to api middlewares array. This is necessary because we need cookies to work in API routes.

'api' => [
    \Illuminate\Cookie\Middleware\AddQueuedCookiesToResponse::class,
    \Illuminate\Routing\Middleware\ThrottleRequests::class.':api',
    \Illuminate\Routing\Middleware\SubstituteBindings::class,
],

Set new option in your .env file:

SSO_SESSION_DOMAIN=

Now you should create brokers. You can create new broker using following Artisan CLI command:

$ php artisan sso:broker:create {name}

Broker

Install this package using composer.

$ composer require acidwave/laravel-sso

Copy config file to Laravel project config/ folder.

$ php artisan vendor:publish --provider="AcidWave\LaravelSSO\SSOServiceProvider"

Change type value in config/laravel-sso.php file from server to broker.

Set 4 new options in your .env file:

SSO_SERVER_URL=
SSO_BROKER_NAME=
SSO_BROKER_SECRET=
SSO_SESSION_DOMAIN=
SSO_TYPE=broker

SSO_SERVER_URL is your server's http url without trailing slash. SSO_BROKER_NAME and SSO_BROKER_SECRET must be data which exists in your server's brokers table.

Optionally set the column of your authentication username field on your server ('username' by default) .env file:

SSO_USERNAME_FIELD=email

Edit your app/Http/Kernel.php by adding \AcidWave\LaravelSSO\Middleware\SsoAuthCheck::class middleware to middleware. It should look like this:

protected $middleware = [
        ...
        \AcidWave\LaravelSSO\Middleware\SsoAuthCheck::class,
    ];

That's all. For other Broker pages you should repeat everything from the beginning just changing your Broker name and secret in configuration file.

Example .env options:

SSO_SERVER_URL=https://server.test
SSO_BROKER_NAME=site1
SSO_BROKER_SECRET=892asjdajsdksja74jh38kljk2929023
SSO_SESSION_DOMAIN=".server.test"
SSO_USERNAME_FIELD=email
SSO_TYPE=broker