[Security] Access Token Authenticator #46428

Spomky · 2022-05-21T16:09:04Z

Q	A
Branch?	6.2
Bug fix?	yes
New feature?	yes
Deprecations?	no
Tickets	Fix #45844
License	MIT
Doc PR	symfony/symfony-docs#16819

Hi,

This PR aims at fixing #45844.
It adds a new authenticator that is able to fetch a token in the request header and retrieve the associated user identifier.

The authenticator delegates the token loading to a handler. This handler could manage opaque tokens (random strings stored in a database) or self-contained tokens such as JWT, Paseto, SAML...

RFC6750, section 2: Authenticated Requests
- Token in the request header (section 2.1)
- Token in the query string (section 2.2)
- Token in the request body (section 2.3)
RFC6750, section 3: The WWW-Authenticate Response Header Field
- RFC6750, section 3.1: Error Codes
Documentation: see [Security] Access Tokens symfony-docs#16819
Tests

Firewall Configuration

This PR adds a new authenticator that covers the RFC6750: access_token.
Also, it adds the possibility to extract the token from anywhere in the request.

Basic Configuration

security:
    firewalls:
        main:
            pattern: ^/
            access_token:
                token_handler: access_token.access_token_handler

Complete Configuration

security:
    firewalls:
        main:
            pattern: ^/
            access_token:
                user_provider: 'dedicate_user_provider_for_this_firewall'
                success_handler: 'custom_success_handler'
                failure_handler: 'custom_failure_handler'
                token_handler: access_token.access_token_handler
                token_extractors:
                    - 'security.access_token_extractor.query_string'
                    - 'security.access_token_extractor.request_body'
                    - 'security.access_token_extractor.header'
                    - 'custom_access_token_extractor'

Token Handler

This authenticator relies on a Token Handler. Its responsability is to

load the token
check the token (revocation, expiration time, digital signature...)
return the user ID associated to it

Tokens could be of any kind: opaque strings or self-contained tokens such as JWT, Paseto, SAML2...

Example: from a repository

<?php

namespace App\Security;

use App\Repository\AccessTokenRepository;
use Symfony\Component\Security\Core\Exception\BadCredentialsException;
use Symfony\Component\Security\Http\Authenticator\AccessTokenHandler as AccessTokenHandlerAliasInterface;

class AccessTokenHandler implements AccessTokenHandlerAliasInterface
{
    public function __construct(private readonly AccessTokenRepository $repository)
    {
    }

    public function getUserIdentifierFrom(string $token): string
    {
        $accessToken = $this->repository->findOneByValue($token);
        if ($accessToken === null || !$accessToken->isValid()) {
            throw new BadCredentialsException('Invalid credentials.');
        }

        return $accessToken->getUserId();
    }
}

Example: from a JWT

<?php

namespace App\Security;

use App\Security\JWTLoader;
use App\Security\JWTValidator;
use Symfony\Component\Security\Core\Exception\BadCredentialsException;
use Symfony\Component\Security\Http\Authenticator\AccessTokenHandler as AccessTokenHandlerAliasInterface;

class AccessTokenHandler implements AccessTokenHandlerAliasInterface
{
    public function __construct(
        private readonly JWTLoader $loader,
        private readonly JWTValidator $validator
    )
    {
    }

    public function getUserIdentifierFrom(string $token): string
    {
        try {
            $token = $this->loader->loadJWT($token);
            $this->validator->validate($token);

            return $token->getClaim('sub');
        } catch (\Throwable $e) {
            throw new BadCredentialsException('Invalid credentials.', $e->getCode, $e);
        }
    }
}

chalasr · 2022-05-21T17:20:24Z

I like this approach.

Spomky · 2022-05-21T19:48:49Z

Static analysis / Psalm (pull_request): does not seem relevant
continuous-integration/appveyor/pr: the error seems to be related to a timeout issue
PHPUnit / Tests (8.2) (pull_request): the error reported here: https://github.com/symfony/symfony/runs/6538975401?check_suite_focus=true#step:8:2110 is related to another (unchanged) component. Should I fix it?
PHPUnit / Tests (8.1, low-deps) (pull_request): Error: Class "Symfony\Component\Security\Http\Authenticator\AccessTokenAuthenticator" not found I don't understand this issue. The class is present in the PR

wouterj · 2022-05-22T11:47:09Z

Thanks for checking all tests! (btw, I'll look at the PR somewhere after 6.1 is released)

PHPUnit / Tests (8.2) (pull_request): the error reported here: https://github.com/symfony/symfony/runs/6538975401?check_suite_focus=true#step:8:2110 is related to another (unchanged) component. Should I fix it?

We'll ignore it for this PR (but if you want, a separate PR with a fix is always welcome 😉 )

PHPUnit / Tests (8.1, low-deps) (pull_request): Error: Class "Symfony\Component\Security\Http\Authenticator\AccessTokenAuthenticator" not found I don't understand this issue. The class is present in the PR

See https://symfony.com/doc/current/contributing/code/pull_requests.html#automated-tests You must update the minimum versions in e.g. the SecurityBundle.

src/Symfony/Bundle/SecurityBundle/Resources/config/security_authenticator.php

...e/SecurityBundle/Tests/DependencyInjection/Security/Factory/HeaderAccessTokenFactoryTest.php

...dle/SecurityBundle/Tests/DependencyInjection/Security/Factory/BodyAccessTokenFactoryTest.php

...le/SecurityBundle/Tests/DependencyInjection/Security/Factory/QueryAccessTokenFactoryTest.php

...dle/SecurityBundle/Tests/DependencyInjection/Security/Factory/BodyAccessTokenFactoryTest.php

...le/SecurityBundle/Tests/DependencyInjection/Security/Factory/QueryAccessTokenFactoryTest.php

src/Symfony/Component/Security/Http/Authenticator/AbstractAccessTokenAuthenticator.php

src/Symfony/Component/Security/Http/Authenticator/BodyAccessTokenAuthenticator.php

src/Symfony/Component/Security/Http/Authenticator/QueryAccessTokenAuthenticator.php

Spomky · 2022-05-23T19:28:46Z

Hi,

Many thanks for your comments.
I updated the authenticator that is now based on token "extractors".

security:
    firewalls:
        main:
            pattern: ^/
            access_token:
                token_handler: access_token.access_token_handler
#                token_extractors:
#                    header: 'security.access_token_extractor.header' # This extrator is set by default

You can add any extractor you want. Three already exist:

security.access_token_extractor.header
security.access_token_extractor.query_string
security.access_token_extractor.request_body

You can create as many extractors you need. They shall implement Symfony\Component\Security\Http\Authenticator\AccessToken\AccessTokenExtractorInterface and the method extractToken.

Other parameters are also present:

security:
    firewalls:
        main:
            pattern: ^/
            access_token:
                token_handler: access_token.access_token_handler
                success_handler: access_token.success_handler
                failure_handler: access_token.failure_handler
                user_provider: 'another.user_provider'
                token_extractors:
                    - 'security.access_token_extractor.header'
                    - 'security.access_token_extractor.query_string'
                    - 'security.access_token_extractor.request_body'
                    - 'App\Security\CustomExtractor'

I have not created Exceptions. I revised my mind as the existing ones seem sufficient.
WDYT?

Best regards.

src/Symfony/Bundle/SecurityBundle/DependencyInjection/Security/Factory/AccessTokenFactory.php

src/Symfony/Component/Security/Http/Authenticator/AccessToken/AccessTokenAuthenticator.php

src/Symfony/Component/Security/Http/Authenticator/AccessToken/AccessTokenHandlerInterface.php

src/Symfony/Component/Security/Http/Authenticator/AccessToken/BodyAccessTokenExtractor.php

src/Symfony/Component/Security/Http/Authenticator/AccessToken/HeaderAccessTokenExtractor.php

src/Symfony/Component/Security/Http/Authenticator/AccessToken/QueryAccessTokenExtractor.php

derrabus

Thank you for your PR. In this review, I focussed mainly on code style and best practises. I'll do a more in-depth review later.

src/Symfony/Component/Security/Http/Authenticator/AccessToken/AccessTokenAuthenticator.php

src/Symfony/Component/Security/Http/Authenticator/AccessToken/HeaderAccessTokenExtractor.php

src/Symfony/Component/Security/Http/Authenticator/AccessToken/QueryAccessTokenExtractor.php

...ymfony/Component/Security/Http/Authenticator/Passport/Credentials/AccessTokenCredentials.php

src/Symfony/Component/Security/Http/Tests/Authenticator/BodyAccessTokenAuthenticatorTest.php

src/Symfony/Component/Security/Http/Authenticator/AccessToken/AccessTokenAuthenticator.php

src/Symfony/Component/Security/Core/Authentication/Token/AccessToken.php

src/Symfony/Component/Security/Http/Authenticator/AccessToken/AccessTokenAuthenticator.php

src/Symfony/Component/Security/Http/Authenticator/AccessToken/BodyAccessTokenExtractor.php

...ny/Component/Security/Http/Authenticator/AccessToken/DefaultAuthenticationFailureHandler.php

wouterj

Very cool. Thanks for taking on this adventure @Spomky! (and wow, never knew this would be your first code contribution to Symfony core)

I've reviewed the component part for now. I really like how this PR is strict enough to completely follow the RFC, but yet keep enough open to be useful for many custom-build API authenticators.

src/Symfony/Component/Security/Core/Authentication/Token/AccessToken.php

src/Symfony/Component/Security/Http/Authenticator/AccessToken/AccessTokenExtractorInterface.php

...ny/Component/Security/Http/Authenticator/AccessToken/DefaultAuthenticationFailureHandler.php

src/Symfony/Component/Security/Http/Authenticator/AccessToken/AccessTokenAuthenticator.php

src/Symfony/Component/Security/Http/Authenticator/AccessToken/BodyAccessTokenExtractor.php

...ymfony/Component/Security/Http/Authenticator/Passport/Credentials/AccessTokenCredentials.php

src/Symfony/Component/Security/Http/Authenticator/AccessToken/HeaderAccessTokenExtractor.php

Spomky · 2022-07-16T14:55:51Z

Hi all,

Would you mind to review the changes I made and if the comments you raised have correctly been addressed?
Let me know if you see other modifications I should consider.

Many thanks.
Regards.

wouterj · 2022-07-16T16:23:19Z

@Spomky if you click on the "load more ...", you'll see a review from me. I guess GitHub immediately hid it, so it got lost 🙂

src/Symfony/Component/Security/Http/AccessToken/HeaderAccessTokenExtractor.php

src/Symfony/Bundle/SecurityBundle/DependencyInjection/Security/Factory/AccessTokenFactory.php

src/Symfony/Component/Security/Http/AccessToken/AccessTokenHandlerInterface.php

src/Symfony/Component/Security/Http/AccessToken/FormEncodedBodyExtractor.php

src/Symfony/Component/Security/Http/AccessToken/QueryAccessTokenExtractor.php

src/Symfony/Component/Security/Http/Authenticator/AccessTokenAuthenticator.php

...ymfony/Component/Security/Http/Authenticator/Passport/Credentials/AccessTokenCredentials.php

src/Symfony/Component/Security/Http/Authenticator/AccessTokenAuthenticator.php

lyrixx · 2022-08-01T16:31:46Z

Super feature 👍🏼 Thanks for the work 👏🏼 . I let some comments

Spomky · 2022-08-01T20:48:44Z

Many thanks for the review and comments.
I think I addressed all of them (including those hidden by github).
Let me know if you have any others.

dunglas

🤩

lyrixx

Some comments about the CS, but I'm OK with the global design 👍🏼

lyrixx · 2022-08-02T08:33:56Z

src/Symfony/Component/Security/Http/AccessToken/FormEncodedBodyExtractor.php

+    public function __construct(private readonly string $parameter = 'access_token')
+    {
+    }


You don't always use the same CS. This one ⬆️ VS

public function __construct( private readonly iterable $accessTokenExtractors, ) { }

In my applications (at work), I use the latest: more scalable, and reduce the diff when adding a new param.

However, I don't know what's the standard in Symfony (cc @nicolas-grekas @fabpot)

I ran php-cs-fixer but many files got updated. I just focussed on the one from this PR but the gaps you spotted were not found by the tool.
Anyway, I updated them to be consistent.

src/Symfony/Component/Security/Http/AccessToken/HeaderAccessTokenExtractor.php

src/Symfony/Component/Security/Http/AccessToken/RFC6750AuthenticationFailureHandler.php

wouterj

Hi there! I finally got the chance to review this a bit more in-depth and I'm really liking the feature :)

I've pushed 2 commits to your branch that fix the last 2 big remaining comments. It would be nice if you could squash all your commits into one and after that, it's ready to be merged in my opinion.

Thanks a lot for all the work!

src/Symfony/Component/Security/Http/AccessToken/FormEncodedBodyExtractor.php

src/Symfony/Component/Security/Http/AccessToken/QueryAccessTokenExtractor.php

Spomky · 2022-08-09T17:06:40Z

Hi there! I finally got the chance to review this a bit more in-depth and I'm really liking the feature :)

I've pushed 2 commits to your branch that fix the last 2 big remaining comments. It would be nice if you could squash all your commits into one and after that, it's ready to be merged in my opinion.

Thanks a lot for all the work!

Excellent! Many thanks to you and all the other reviewers.
I edited the few things you spotted and squashed the PR.
This is a big step for me and I really hope it will help many developers to integrate token-based authentication.

src/Symfony/Component/Security/Http/AccessToken/AccessTokenHandlerInterface.php

src/Symfony/Component/Security/Http/Authenticator/AccessTokenAuthenticator.php

chalasr · 2022-08-10T10:19:58Z

Thank you @Spomky.

Spomky · 2022-08-11T11:10:03Z

So cool! Many thanks for merging this PR.

derrabus · 2022-08-11T18:16:49Z

Awesome! 🚀

vincentchalamon · 2022-11-28T14:21:47Z

@Spomky Question regarding the configuration of this feature: why adding user_provider option, and not rely on the firewall user provider?

Spomky · 2022-11-29T06:13:20Z

@vincentchalamon this allows setting a specific user provider for this firewall. If not set, the default user provider is used.

chalasr · 2022-11-29T11:22:52Z

See #48385

Spomky requested review from chalasr and wouterj as code owners May 21, 2022 16:09

carsonbot added Status: Needs Review Bug Feature Security labels May 21, 2022

carsonbot added this to the 6.2 milestone May 21, 2022

Spomky marked this pull request as draft May 21, 2022 16:09

Spomky mentioned this pull request May 21, 2022

[Security] Add Bearer Authenticator #45844

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[Security] Access Tokens symfony/symfony-docs#16819

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[Security] Implement HttpBearerAuthenticator #46429

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Add Keycloak authentication api-platform/demo#265

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[Security] Access Token Authenticator

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SF6.2 Access Token Support lexik/LexikJWTAuthenticationBundle#1062

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[Security] Access Token Authenticator #46428

[Security] Access Token Authenticator #46428

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Spomky commented May 21, 2022 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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Firewall Configuration

Basic Configuration

Complete Configuration

Token Handler

Example: from a repository

Example: from a JWT

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chalasr commented May 21, 2022

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Spomky commented May 21, 2022

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wouterj commented May 22, 2022

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Spomky commented Jul 16, 2022

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Spomky commented May 21, 2022 •

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