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Add support for authorization code grant with PKCE for distributed apps #1067

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Add support for authorization code grant with PKCE for distributed apps #1067

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1 change: 1 addition & 0 deletions .gitignore
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Original file line number Diff line number Diff line change
Expand Up @@ -3,3 +3,4 @@ test/config/test.sqlite
vendor
composer.lock
.idea
.phpunit.result.cache
56 changes: 54 additions & 2 deletions src/OAuth2/Controller/AuthorizeController.php
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Expand Up @@ -2,6 +2,7 @@

namespace OAuth2\Controller;

use OAuth2\Storage\ClientCredentialsInterface;
use OAuth2\Storage\ClientInterface;
use OAuth2\ScopeInterface;
use OAuth2\RequestInterface;
Expand Down Expand Up @@ -61,6 +62,16 @@ class AuthorizeController implements AuthorizeControllerInterface
*/
protected $scopeUtil;

/**
* @var string|null
*/
protected $code_challenge;

/**
* @var string|null
*/
protected $code_challenge_method;

/**
* Constructor
*
Expand Down Expand Up @@ -88,6 +99,8 @@ public function __construct(ClientInterface $clientStorage, array $responseTypes
'require_exact_redirect_uri' => true,
'redirect_status_code' => 302,
'enforce_pkce' => false,
'enforce_pkce_for_public_clients' => false,
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ℹ️ this should probably default to true for new installs, but that could be a breaking change for existing installs. Leaving this at false allows for releasing as a minor version. Would recommend defaulting to true for the next major version.

'supported_code_challenge_methods' => ['plain', 'S256'],
), $config);

if (is_null($scopeUtil)) {
Expand Down Expand Up @@ -139,7 +152,7 @@ public function handleAuthorizeRequest(RequestInterface $request, ResponseInterf

$authResult = $this->responseTypes[$this->response_type]->getAuthorizeResponse($params, $user_id);

list($redirect_uri, $uri_params) = $authResult;
[$redirect_uri, $uri_params] = $authResult;

if (empty($redirect_uri) && !empty($registered_redirect_uri)) {
$redirect_uri = $registered_redirect_uri;
Expand Down Expand Up @@ -186,6 +199,8 @@ protected function buildAuthorizeParameters($request, $response, $user_id)
'client_id' => $this->client_id,
'redirect_uri' => $this->redirect_uri,
'response_type' => $this->response_type,
'code_challenge' => $this->code_challenge,
'code_challenge_method' => $this->code_challenge_method,
);

return $params;
Expand Down Expand Up @@ -257,7 +272,7 @@ public function validateAuthorizeRequest(RequestInterface $request, ResponseInte
$response_type = $request->query('response_type', $request->request('response_type'));

// for multiple-valued response types - make them alphabetical
if (false !== strpos($response_type, ' ')) {
if ($response_type && false !== strpos($response_type, ' ')) {
$types = explode(' ', $response_type);
sort($types);
$response_type = ltrim(implode(' ', $types));
Expand Down Expand Up @@ -334,13 +349,50 @@ public function validateAuthorizeRequest(RequestInterface $request, ResponseInte
return false;
}

$code_challenge = $request->query('code_challenge');
$code_challenge_method = $request->query('code_challenge_method');
if ($code_challenge) {
if (preg_match('/^[A-Za-z0-9-._~]{43,128}$/', $code_challenge) !== 1) {
$response->setError(400, 'invalid_code_challenge', 'The PKCE code challenge supplied is invalid');

return false;
}

$supported_challenge_methods = $this->config['supported_code_challenge_methods'] ?? ['plain', 'S256'];
if (!$code_challenge_method) {
$response->setError(400, 'missing_code_challenge_method', 'This application requires you specify a PKCE code challenge method. Supported methods: ' . implode(', ', $supported_challenge_methods)
);

return false;
}
if (!in_array($code_challenge_method, $supported_challenge_methods, true)) {
$response->setError(400, 'invalid_code_challenge_method', 'The PKCE code challenge method supplied is invalid. Supported methods: ' . implode(', ', $supported_challenge_methods)
);

return false;
}
} else {
$isPublic = false;
if ($this->clientStorage instanceof ClientCredentialsInterface) {
$isPublic = $this->clientStorage->isPublicClient($client_id);
Comment on lines +376 to +377
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ℹ️ not sure why there are two interfaces, but the property is only typed to the higher level one which doesn't have the method we need.

}

if ($this->config['enforce_pkce'] || ($this->config['enforce_pkce_for_public_clients'] && $isPublic)) {
$response->setError(400, 'missing_code_challenge', 'This application requires you provide a PKCE code challenge');

return false;
}
}

// save the input data and return true
$this->scope = $requestedScope;
$this->state = $state;
$this->client_id = $client_id;
// Only save the SUPPLIED redirect URI (@see http://tools.ietf.org/html/rfc6749#section-4.1.3)
$this->redirect_uri = $supplied_redirect_uri;
$this->response_type = $response_type;
$this->code_challenge = $code_challenge;
$this->code_challenge_method = $code_challenge_method;

return true;
}
Expand Down
2 changes: 1 addition & 1 deletion src/OAuth2/GrantType/AuthorizationCode.php
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Expand Up @@ -112,7 +112,7 @@ public function validateRequest(RequestInterface $request, ResponseInterface $re

return FALSE;
}
if ($code_verifier_hashed !== $authCode['code_challenge']) {
if (!hash_equals($authCode['code_challenge'], $code_verifier_hashed)) {
$response->setError(400, 'code_verifier_mismatch', "The PKCE code verifier parameter does not match the code challenge.");

return FALSE;
Expand Down
42 changes: 1 addition & 41 deletions src/OAuth2/OpenID/Controller/AuthorizeController.php
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Expand Up @@ -7,7 +7,7 @@
use OAuth2\ResponseInterface;

/**
* @see OAuth2\Controller\AuthorizeControllerInterface
* @see \OAuth2\Controller\AuthorizeControllerInterface
*/
class AuthorizeController extends BaseAuthorizeController implements AuthorizeControllerInterface
{
Expand All @@ -16,16 +16,6 @@ class AuthorizeController extends BaseAuthorizeController implements AuthorizeCo
*/
private $nonce;

/**
* @var mixed
*/
protected $code_challenge;
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ℹ️ these properties and their behavior moved to the parent class


/**
* @var mixed
*/
protected $code_challenge_method;

/**
* Set not authorized response
*
Expand Down Expand Up @@ -75,10 +65,6 @@ protected function buildAuthorizeParameters($request, $response, $user_id)
// add the nonce to return with the redirect URI
$params['nonce'] = $this->nonce;

// Add PKCE code challenge.
$params['code_challenge'] = $this->code_challenge;
$params['code_challenge_method'] = $this->code_challenge_method;

return $params;
}

Expand All @@ -104,32 +90,6 @@ public function validateAuthorizeRequest(RequestInterface $request, ResponseInte

$this->nonce = $nonce;

$code_challenge = $request->query('code_challenge');
$code_challenge_method = $request->query('code_challenge_method');

if ($this->config['enforce_pkce']) {
if (!$code_challenge) {
$response->setError(400, 'missing_code_challenge', 'This application requires you provide a PKCE code challenge');

return false;
}

if (preg_match('/^[A-Za-z0-9-._~]{43,128}$/', $code_challenge) !== 1) {
$response->setError(400, 'invalid_code_challenge', 'The PKCE code challenge supplied is invalid');

return false;
}

if (!in_array($code_challenge_method, array('plain', 'S256'), true)) {
$response->setError(400, 'missing_code_challenge_method', 'This application requires you specify a PKCE code challenge method');

return false;
}
}

$this->code_challenge = $code_challenge;
$this->code_challenge_method = $code_challenge_method;

return true;
}

Expand Down
4 changes: 3 additions & 1 deletion src/OAuth2/Server.php
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Expand Up @@ -173,6 +173,8 @@ public function __construct($storage = array(), array $config = array(), array $
'require_exact_redirect_uri' => true,
'allow_implicit' => false,
'enforce_pkce' => false,
'enforce_pkce_for_public_clients' => false,
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ℹ️ same comment about default value

'supported_code_challenge_methods' => array('plain', 'S256'),
'allow_credentials_in_request_body' => true,
'allow_public_clients' => true,
'always_issue_new_refresh_token' => false,
Expand Down Expand Up @@ -578,7 +580,7 @@ protected function createDefaultAuthorizeController()
}
}

$config = array_intersect_key($this->config, array_flip(explode(' ', 'allow_implicit enforce_state require_exact_redirect_uri enforce_pkce')));
$config = array_intersect_key($this->config, array_flip(explode(' ', 'allow_implicit enforce_state require_exact_redirect_uri enforce_pkce enforce_pkce_for_public_clients supported_code_challenge_methods')));

if ($this->config['use_openid_connect']) {
return new OpenIDAuthorizeController($this->storages['client'], $this->responseTypes, $config, $this->getScopeUtil());
Expand Down
121 changes: 121 additions & 0 deletions test/OAuth2/Controller/AuthorizeControllerTest.php
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Expand Up @@ -342,6 +342,125 @@ public function testUserDeniesAccessResponse()
$this->assertEquals($query['error_description'], 'The user denied access to your application');
}

public function testEnforcePkce()
{
$server = $this->getTestServer(array('enforce_pkce' => true));
$request = new Request(array(
'client_id' => 'Test Client ID', // valid client id
'redirect_uri' => 'http://adobe.com', // valid redirect URI
'response_type' => 'code',
'state' => 'xyz',
));
$server->handleAuthorizeRequest($request, $response = new Response(), true);

$this->assertEquals($response->getStatusCode(), 400);
$this->assertEquals('missing_code_challenge', $response->getParameter('error'));
$this->assertEquals('This application requires you provide a PKCE code challenge', $response->getParameter('error_description'));
}

public function testEnforcePkcePublicClient()
{
$server = $this->getTestServer(array('enforce_pkce_for_public_clients' => true));
$request = new Request(array(
'client_id' => 'Test Public Client ID', // valid client id
'redirect_uri' => 'http://adobe.com', // valid redirect URI
'response_type' => 'code',
'state' => 'xyz',
));
$server->handleAuthorizeRequest($request, $response = new Response(), true);

$this->assertEquals($response->getStatusCode(), 400);
$this->assertEquals('missing_code_challenge', $response->getParameter('error'));
$this->assertEquals('This application requires you provide a PKCE code challenge', $response->getParameter('error_description'));
}

public function testInvalidCodeChallenge()
{
$server = $this->getTestServer(array('enforce_pkce' => true));
$request = new Request(array(
'client_id' => 'Test Client ID', // valid client id
'redirect_uri' => 'http://adobe.com', // valid redirect URI
'response_type' => 'code',
'state' => 'xyz',
'code_challenge' => 'invalid!',
'code_challenge_method' => 'plain',
));
$server->handleAuthorizeRequest($request, $response = new Response(), true);

$this->assertEquals($response->getStatusCode(), 400);
$this->assertEquals('invalid_code_challenge', $response->getParameter('error'));
$this->assertEquals('The PKCE code challenge supplied is invalid', $response->getParameter('error_description'));
}

public function testMissingCodeChallengeMethod()
{
$server = $this->getTestServer(array('enforce_pkce' => true));
$request = new Request(array(
'client_id' => 'Test Client ID', // valid client id
'redirect_uri' => 'http://adobe.com', // valid redirect URI
'response_type' => 'code',
'state' => 'xyz',
'code_challenge' => 'E9Melhoa2OwvFrEMTJguCHaoeK1t8URWbuGJSstw-cM',
));
$server->handleAuthorizeRequest($request, $response = new Response(), true);

$this->assertEquals($response->getStatusCode(), 400);
$this->assertEquals('missing_code_challenge_method', $response->getParameter('error'));
$this->assertEquals('This application requires you specify a PKCE code challenge method. Supported methods: plain, S256', $response->getParameter('error_description'));
}

public function testInvalidCodeChallengeMethod()
{
$server = $this->getTestServer(array('enforce_pkce' => true));
$request = new Request(array(
'client_id' => 'Test Client ID', // valid client id
'redirect_uri' => 'http://adobe.com', // valid redirect URI
'response_type' => 'code',
'state' => 'xyz',
'code_challenge' => 'E9Melhoa2OwvFrEMTJguCHaoeK1t8URWbuGJSstw-cM',
'code_challenge_method' => 'invalid',
));
$server->handleAuthorizeRequest($request, $response = new Response(), true);

$this->assertEquals($response->getStatusCode(), 400);
$this->assertEquals('invalid_code_challenge_method', $response->getParameter('error'));
$this->assertEquals('The PKCE code challenge method supplied is invalid. Supported methods: plain, S256', $response->getParameter('error_description'));
}

public function testSuccessfulPkceChallenge()
{
$server = $this->getTestServer(array('enforce_pkce' => true));
$request = new Request(array(
'client_id' => 'Test Client ID', // valid client id
'redirect_uri' => 'http://adobe.com', // valid redirect URI
'response_type' => 'code',
'state' => 'xyz',
'code_challenge' => 'E9Melhoa2OwvFrEMTJguCHaoeK1t8URWbuGJSstw-cM',
'code_challenge_method' => 'S256',
));
$server->handleAuthorizeRequest($request, $response = new Response(), true);

$this->assertEquals($response->getStatusCode(), 302);
$location = $response->getHttpHeader('Location');
$parts = parse_url($location);
parse_str($parts['query'], $query);

$this->assertEquals('http', $parts['scheme']); // same as passed in to redirect_uri
$this->assertEquals('adobe.com', $parts['host']); // same as passed in to redirect_uri
$this->assertArrayHasKey('query', $parts);
$this->assertFalse(isset($parts['fragment']));

// assert fragment is in "application/x-www-form-urlencoded" format
parse_str($parts['query'], $query);
$this->assertNotNull($query);
$this->assertArrayHasKey('code', $query);

// assert code challenge is stored
$code = $server->getStorage('authorization_code')->getAuthorizationCode($query['code']);
$this->assertEquals($code['code_challenge'], 'E9Melhoa2OwvFrEMTJguCHaoeK1t8URWbuGJSstw-cM');
$this->assertEquals($code['code_challenge_method'], 'S256');
}

public function testCodeQueryParamIsSet()
{
$server = $this->getTestServer();
Expand Down Expand Up @@ -478,6 +597,8 @@ public function testCreateController()
{
$storage = Bootstrap::getInstance()->getMemoryStorage();
$controller = new AuthorizeController($storage);

$this->expectNotToPerformAssertions();
}

private function getTestServer($config = array())
Expand Down
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