Inject <saml:Subject><saml:NameID> into User-Entity

OneloginSamlBundle

Overview

This bundle depends on Symfony 6 and newer.
For older Symfony versions you can use hslavich/oneloginsaml-bundle which this bundle based on.

Installation

composer require nbgrp/onelogin-saml-bundle

If you use Symfony Flex it enables the bundle automatically. Otherwise, to enable the bundle add the following code in config/bundles.php:

return [
    // ...
    Nbgrp\OneloginSamlBundle\NbgrpOneloginSamlBundle::class => ['all' => true],
];

Configuration

To configure the bundle you need to add configuration in config/packages/nbgrp_onelogin_saml.yaml. You can use any configuration format (yaml, xml, or php), but for convenience in this document will be used yaml.

Check https://github.com/onelogin/php-saml#settings for more info about OneLogin PHP SAML settings.

You can use <request_scheme_and_host> placeholder in the following configuration values which will be replaced by the appropriate values from the Request object:

onelogin_settings.sp.entityId

onelogin_settings.sp.assertionConsumerService.url

onelogin_settings.sp.singleLogoutService.url

onelogin_settings.baseurl

Pay attention to trusted proxies settings if you're running your application behind a load balancer or a reverse proxy.

nbgrp_onelogin_saml:
    onelogin_settings:
        default:
            # Mandatory SAML settings
            idp:
                entityId: 'https://id.example.com/saml2/idp/metadata.php'
                singleSignOnService:
                    url: 'https://id.example.com/saml2/idp/SSOService.php'
                    binding: 'urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect'
                singleLogoutService:
                    url: 'https://id.example.com/saml2/idp/SingleLogoutService.php'
                    binding: 'urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect'
                x509cert: 'MIIC...'
            sp:
                entityId: 'https://myapp.com/saml/metadata'  #  Default: '<request_scheme_and_host>/saml/metadata'
                assertionConsumerService:
                    url: 'https://myapp.com/saml/acs'  #  Default: '<request_scheme_and_host>/saml/acs'
                    binding: 'urn:oasis:names:tc:SAML:2.0:bindings:HTTP-POST'
                singleLogoutService:
                    url: 'https://myapp.com/saml/logout'  #  Default: '<request_scheme_and_host>/saml/logout'
                    binding: 'urn:oasis:names:tc:SAML:2.0:bindings:HTTP-Redirect'
                privateKey: 'MIIE...'
            # Optional SAML settings
            baseurl: 'https://myapp.com/saml/'  #  Default: '<request_scheme_and_host>/saml/'
            strict: true
            debug: true
            security:
                nameIdEncrypted: false
                authnRequestsSigned: false
                logoutRequestSigned: false
                logoutResponseSigned: false
                signMetadata: false
                wantMessagesSigned: false
                wantAssertionsEncrypted: false
                wantAssertionsSigned: true
                wantNameId: false
                wantNameIdEncrypted: false
                requestedAuthnContext: true
                wantXMLValidation: false
                relaxDestinationValidation: false
                destinationStrictlyMatches: true
                allowRepeatAttributeName: false
                rejectUnsolicitedResponsesWithInResponseTo: false
                signatureAlgorithm: 'http://www.w3.org/2001/04/xmldsig-more#rsa-sha256'
                digestAlgorithm: 'http://www.w3.org/2001/04/xmlenc#sha256'
                encryption_algorithm: 'http://www.w3.org/2001/04/xmlenc#aes256-cbc'
                lowercaseUrlencoding: false
            contactPerson:
                technical:
                    givenName: 'Tech User'
                    emailAddress: '[email protected]'
                support:
                    givenName: 'Support User'
                    emailAddress: '[email protected]'
                administrative:
                    givenName: 'Administrative User'
                    emailAddress: '[email protected]'
            organization:
                en-US:
                    name: 'Example'
                    displayname: 'Example'
                    url: 'http://example.com'
            compress:
                requests: false
                responses: false
        # Optional another one SAML settings (see Multiple IdP below)
        another:
            idp:
                # ...
            sp:
                # ...
            # ...
    # Optional parameters
    use_proxy_vars: true
    idp_parameter_name: 'custom-idp'
    entity_manager_name: 'custom-em'

There are few extra parameters for idp and sp sections. You can read more about them from OneLogin PHP SAML docs.

Instead of specify IdP and SP x509 certificates and private keys, you can store them in OneLogin PHP SAML certs directory or use global constant ONELOGIN_CUSTOMPATH to specify custom directory (complete path will be ONELOGIN_CUSTOMPATH.'certs/').

If you do not want to set some contactPerson or organization info, do not add those parameters instead of leaving them blank.

Configure user provider and firewall in config/packages/security.yaml:

security:
    # ...

    providers:
        saml_provider:
            ##  Basic provider instantiates a user with identifier and default roles
            saml:
                user_class: 'App\Entity\User'
                default_roles: ['ROLE_USER']

    firewalls:
        main:
            pattern: ^/
            saml:
                ##  Match SAML attribute 'uid' with user identifier.
                ##  Otherwise, used \OneLogin\Saml2\Auth::getNameId() method by default.
                identifier_attribute: uid
                ##  Use the attribute's friendlyName instead of the name.
                use_attribute_friendly_name: true
                check_path: saml_acs
                login_path: saml_login
            logout:
                path: saml_logout

    access_control:
        - { path: ^/saml/(metadata|login|acs), roles: PUBLIC_ACCESS }
        - { path: ^/, roles: ROLE_USER }

Edit your config/routes.yaml:

nbgrp_saml:
    resource: "@NbgrpOneloginSamlBundle/Resources/config/routes.php"

Multiple IdP

You can configure more than one OneLogin PHP SAML settings for multiple IdP. To do this you need to specify SAML settings for each IdP (sections with default and another keys in configuration above) and pass the name of the necessary IdP by a query string parameter idp or a request attribute with the same name. You can use another name with help of idp_parameter_name bundle parameter.

To use appropriate SAML settings, all requests to bundle routes should contain correct IdP parameter.

If a request has no query parameter or attribute with IdP value, the first key in onelogin_settings section will be used as default IdP.

Using reverse proxy

When you use your application behind a reverse proxy and use X-Forwarded-* headers, you need to set parameter nbgrp_onelogin_saml.use_proxy_vars = true to allow underlying OneLogin library determine request protocol, host and port correctly.

Optional features

Inject SAML attributes into User object

To be able to inject SAML attributes into user object, you must implement SamlUserInterface.

<?php

namespace App\Entity;

use Nbgrp\OneloginSamlBundle\Security\User\SamlUserInterface;

class User implements SamlUserInterface
{
    private $username;
    private $email;

    // ...

    public function setSamlAttributes(array $attributes)
    {
        $this->email = $attributes['mail'][0];
    }
}

In addition to injecting SAML attributes to user, you can get them by getAttributes method from current security token (that should be an instance of Nbgrp\OneloginSamlBundle\Security\Http\Authenticator\Token\SamlToken).

Integration with classic login form

You can integrate SAML authentication with traditional login form by editing your security.yaml:

security:
    enable_authenticator_manager: true

    providers:
        user_provider:
            # ...

    firewalls:
        main:
            saml:
                # ...

            ##  Traditional login form
            form_login:
                login_path: /login
                check_path: /login_check
                # ...

            logout:
                path: saml_logout

Then you can add a link to route saml_login in your login page in order to start SAML sign-on.

<a href="{{ path('saml_login') }}">SAML Login</a>

If you use multiple IdP, you should specify it by path argument:

<a href="{{ path('saml_login', { idp: 'another' }) }}">SAML Login</a>

Just-in-time user provisioning

In order for a user to be provisioned, you must use a user provider that throws UserNotFoundException (e.g. EntityUserProvider as used in the example above). The SamlUserProvider does not throw this exception which will cause an empty user to be returned (if your user class not implements Nbgrp\OneloginSamlBundle\Security\User\SamlUserInterface).

It is possible to have a new user provisioned based on the received SAML attributes when the user provider cannot find a user.

Create the user factory service by editing services.yaml:

services:
    saml_user_factory:
        class: Nbgrp\OneloginSamlBundle\Security\User\SamlUserFactory
        arguments:
            ##  User class
            - App\Entity\User
            ##  Attribute mapping
            - password: 'notused'
              email: $mail
              name: $cn
              lastname: $sn
              roles: ['ROLE_USER']
              groups: $groups[]

Mapping items with '$' at the beginning of values references to SAML attribute value.
Values with '[]' at the end will be presented as arrays (even if they originally are scalars).

Then add the created service id as the user_factory parameter into your firewall settings in security.yaml:

security:
    # ...

    providers:
        saml_provider:
            ##  Loads user from user repository
            entity:
                class: App\Entity\User
                property: username

    firewalls:
        main:
            provider: saml_provider
            saml:
                identifier_attribute: uid
                ##  User factory service
                user_factory: saml_user_factory
                # ...

Also, you can create your own User Factory that implements Nbgrp\OneloginSamlBundle\Security\User\SamlUserFactoryInterface.

<?php

namespace App\Security;

use App\Entity\User;
use Nbgrp\OneloginSamlBundle\Security\User\SamlUserFactoryInterface;
use Symfony\Component\Security\Core\User\UserInterface;

class UserFactory implements SamlUserFactoryInterface
{
    public function createUser(string $identifier, array $attributes): UserInterface
    {
        $user = new User();
        $user->setRoles(['ROLE_USER']);
        $user->setUsername($username);
        $user->setEmail($attributes['mail'][0]);
        // ...

        return $user;
    }
}

And add it into services.yaml:

services:
    saml_user_factory:
        class: App\Security\UserFactory

Persist user on creation and SAML attributes injection

Symfony EventDispatcher component and Doctrine ORM are required.

If you want to persist user object after success authentication, you need to add persist_user in you firewall settings in security.yaml:

security:
    # ...

    firewalls:
        # ...

        main:
            saml:
                # ...
                persist_user: true

To use non-default entity manager, specify its name in the nbgrp_onelogin_saml.entity_manager_name bundle configuration parameter.

User persistence is performing by the event listeners Nbgrp\OneloginSamlBundle\EventListener\User\UserCreatedListener and Nbgrp\OneloginSamlBundle\EventListener\User\UserModifiedListener that can be decorated if you need to override the default behavior.

Also, you can make your own listeners for Nbgrp\OneloginSamlBundle\Event\UserCreatedEvent and Nbgrp\OneloginSamlBundle\Event\UserModifiedEvent events:

<?php

namespace App\Security;

use Nbgrp\OneloginSamlBundle\Event\UserCreatedEvent;
use Symfony\Component\EventDispatcher\Attribute\AsEventListener;

#[AsEventListener(event: UserCreatedEvent::class, dispatcher: 'security.event_dispatcher.main')]
class UserCreatedListener
{
    public function __invoke(UserCreatedEvent $event): void
    {
        // ...
    }
}

Important: you must specify the dispatcher option corresponding the firewall which will trigger the event (main in the example above). Read more about Security Events.

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onelogin-saml-bundle's Introduction

OneloginSamlBundle

Overview

Installation

Configuration

Multiple IdP

Using reverse proxy

Optional features

Inject SAML attributes into User object

Integration with classic login form

Just-in-time user provisioning

Persist user on creation and SAML attributes injection

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