ok
Mini Shell
<?php
/**
* @author Alex Bilbie <hello@alexbilbie.com>
* @copyright Copyright (c) Alex Bilbie
* @license http://mit-license.org/
*
* @link https://github.com/thephpleague/oauth2-server
*/
namespace League\OAuth2\Server\Grant;
use DateInterval;
use DateTimeImmutable;
use Exception;
use League\OAuth2\Server\CodeChallengeVerifiers\CodeChallengeVerifierInterface;
use League\OAuth2\Server\CodeChallengeVerifiers\PlainVerifier;
use League\OAuth2\Server\CodeChallengeVerifiers\S256Verifier;
use League\OAuth2\Server\Entities\ClientEntityInterface;
use League\OAuth2\Server\Entities\UserEntityInterface;
use League\OAuth2\Server\Exception\OAuthServerException;
use League\OAuth2\Server\Repositories\AuthCodeRepositoryInterface;
use League\OAuth2\Server\Repositories\RefreshTokenRepositoryInterface;
use League\OAuth2\Server\RequestAccessTokenEvent;
use League\OAuth2\Server\RequestEvent;
use League\OAuth2\Server\RequestRefreshTokenEvent;
use League\OAuth2\Server\RequestTypes\AuthorizationRequest;
use League\OAuth2\Server\ResponseTypes\RedirectResponse;
use League\OAuth2\Server\ResponseTypes\ResponseTypeInterface;
use LogicException;
use Psr\Http\Message\ServerRequestInterface;
use stdClass;
class AuthCodeGrant extends AbstractAuthorizeGrant
{
/**
* @var DateInterval
*/
private $authCodeTTL;
/**
* @var bool
*/
private $requireCodeChallengeForPublicClients = true;
/**
* @var CodeChallengeVerifierInterface[]
*/
private $codeChallengeVerifiers = [];
/**
* @param AuthCodeRepositoryInterface $authCodeRepository
* @param RefreshTokenRepositoryInterface $refreshTokenRepository
* @param DateInterval $authCodeTTL
*
* @throws Exception
*/
public function __construct(
AuthCodeRepositoryInterface $authCodeRepository,
RefreshTokenRepositoryInterface $refreshTokenRepository,
DateInterval $authCodeTTL
) {
$this->setAuthCodeRepository($authCodeRepository);
$this->setRefreshTokenRepository($refreshTokenRepository);
$this->authCodeTTL = $authCodeTTL;
$this->refreshTokenTTL = new DateInterval('P1M');
if (\in_array('sha256', \hash_algos(), true)) {
$s256Verifier = new S256Verifier();
$this->codeChallengeVerifiers[$s256Verifier->getMethod()] = $s256Verifier;
}
$plainVerifier = new PlainVerifier();
$this->codeChallengeVerifiers[$plainVerifier->getMethod()] = $plainVerifier;
}
/**
* Disable the requirement for a code challenge for public clients.
*/
public function disableRequireCodeChallengeForPublicClients()
{
$this->requireCodeChallengeForPublicClients = false;
}
/**
* Respond to an access token request.
*
* @param ServerRequestInterface $request
* @param ResponseTypeInterface $responseType
* @param DateInterval $accessTokenTTL
*
* @throws OAuthServerException
*
* @return ResponseTypeInterface
*/
public function respondToAccessTokenRequest(
ServerRequestInterface $request,
ResponseTypeInterface $responseType,
DateInterval $accessTokenTTL
) {
list($clientId) = $this->getClientCredentials($request);
$client = $this->getClientEntityOrFail($clientId, $request);
// Only validate the client if it is confidential
if ($client->isConfidential()) {
$this->validateClient($request);
}
$encryptedAuthCode = $this->getRequestParameter('code', $request, null);
if (!\is_string($encryptedAuthCode)) {
throw OAuthServerException::invalidRequest('code');
}
try {
$authCodePayload = \json_decode($this->decrypt($encryptedAuthCode));
$this->validateAuthorizationCode($authCodePayload, $client, $request);
$scopes = $this->scopeRepository->finalizeScopes(
$this->validateScopes($authCodePayload->scopes),
$this->getIdentifier(),
$client,
$authCodePayload->user_id
);
} catch (LogicException $e) {
throw OAuthServerException::invalidRequest('code', 'Cannot decrypt the authorization code', $e);
}
$codeVerifier = $this->getRequestParameter('code_verifier', $request, null);
// If a code challenge isn't present but a code verifier is, reject the request to block PKCE downgrade attack
if (empty($authCodePayload->code_challenge) && $codeVerifier !== null) {
throw OAuthServerException::invalidRequest(
'code_challenge',
'code_verifier received when no code_challenge is present'
);
}
if (!empty($authCodePayload->code_challenge)) {
$this->validateCodeChallenge($authCodePayload, $codeVerifier);
}
// Issue and persist new access token
$accessToken = $this->issueAccessToken($accessTokenTTL, $client, $authCodePayload->user_id, $scopes);
$this->getEmitter()->emit(new RequestAccessTokenEvent(RequestEvent::ACCESS_TOKEN_ISSUED, $request, $accessToken));
$responseType->setAccessToken($accessToken);
// Issue and persist new refresh token if given
$refreshToken = $this->issueRefreshToken($accessToken);
if ($refreshToken !== null) {
$this->getEmitter()->emit(new RequestRefreshTokenEvent(RequestEvent::REFRESH_TOKEN_ISSUED, $request, $refreshToken));
$responseType->setRefreshToken($refreshToken);
}
// Revoke used auth code
$this->authCodeRepository->revokeAuthCode($authCodePayload->auth_code_id);
return $responseType;
}
private function validateCodeChallenge($authCodePayload, $codeVerifier)
{
if ($codeVerifier === null) {
throw OAuthServerException::invalidRequest('code_verifier');
}
// Validate code_verifier according to RFC-7636
// @see: https://tools.ietf.org/html/rfc7636#section-4.1
if (\preg_match('/^[A-Za-z0-9-._~]{43,128}$/', $codeVerifier) !== 1) {
throw OAuthServerException::invalidRequest(
'code_verifier',
'Code Verifier must follow the specifications of RFC-7636.'
);
}
if (\property_exists($authCodePayload, 'code_challenge_method')) {
if (isset($this->codeChallengeVerifiers[$authCodePayload->code_challenge_method])) {
$codeChallengeVerifier = $this->codeChallengeVerifiers[$authCodePayload->code_challenge_method];
if ($codeChallengeVerifier->verifyCodeChallenge($codeVerifier, $authCodePayload->code_challenge) === false) {
throw OAuthServerException::invalidGrant('Failed to verify `code_verifier`.');
}
} else {
throw OAuthServerException::serverError(
\sprintf(
'Unsupported code challenge method `%s`',
$authCodePayload->code_challenge_method
)
);
}
}
}
/**
* Validate the authorization code.
*
* @param stdClass $authCodePayload
* @param ClientEntityInterface $client
* @param ServerRequestInterface $request
*/
private function validateAuthorizationCode(
$authCodePayload,
ClientEntityInterface $client,
ServerRequestInterface $request
) {
if (!\property_exists($authCodePayload, 'auth_code_id')) {
throw OAuthServerException::invalidRequest('code', 'Authorization code malformed');
}
if (\time() > $authCodePayload->expire_time) {
throw OAuthServerException::invalidRequest('code', 'Authorization code has expired');
}
if ($this->authCodeRepository->isAuthCodeRevoked($authCodePayload->auth_code_id) === true) {
throw OAuthServerException::invalidRequest('code', 'Authorization code has been revoked');
}
if ($authCodePayload->client_id !== $client->getIdentifier()) {
throw OAuthServerException::invalidRequest('code', 'Authorization code was not issued to this client');
}
// The redirect URI is required in this request
$redirectUri = $this->getRequestParameter('redirect_uri', $request, null);
if (empty($authCodePayload->redirect_uri) === false && $redirectUri === null) {
throw OAuthServerException::invalidRequest('redirect_uri');
}
if ($authCodePayload->redirect_uri !== $redirectUri) {
throw OAuthServerException::invalidRequest('redirect_uri', 'Invalid redirect URI');
}
}
/**
* Return the grant identifier that can be used in matching up requests.
*
* @return string
*/
public function getIdentifier()
{
return 'authorization_code';
}
/**
* {@inheritdoc}
*/
public function canRespondToAuthorizationRequest(ServerRequestInterface $request)
{
return (
\array_key_exists('response_type', $request->getQueryParams())
&& $request->getQueryParams()['response_type'] === 'code'
&& isset($request->getQueryParams()['client_id'])
);
}
/**
* {@inheritdoc}
*/
public function validateAuthorizationRequest(ServerRequestInterface $request)
{
$clientId = $this->getQueryStringParameter(
'client_id',
$request,
$this->getServerParameter('PHP_AUTH_USER', $request)
);
if ($clientId === null) {
throw OAuthServerException::invalidRequest('client_id');
}
$client = $this->getClientEntityOrFail($clientId, $request);
$redirectUri = $this->getQueryStringParameter('redirect_uri', $request);
if ($redirectUri !== null) {
if (!\is_string($redirectUri)) {
throw OAuthServerException::invalidRequest('redirect_uri');
}
$this->validateRedirectUri($redirectUri, $client, $request);
} elseif (empty($client->getRedirectUri()) ||
(\is_array($client->getRedirectUri()) && \count($client->getRedirectUri()) !== 1)) {
$this->getEmitter()->emit(new RequestEvent(RequestEvent::CLIENT_AUTHENTICATION_FAILED, $request));
throw OAuthServerException::invalidClient($request);
}
$defaultClientRedirectUri = \is_array($client->getRedirectUri())
? $client->getRedirectUri()[0]
: $client->getRedirectUri();
$scopes = $this->validateScopes(
$this->getQueryStringParameter('scope', $request, $this->defaultScope),
$redirectUri ?? $defaultClientRedirectUri
);
$stateParameter = $this->getQueryStringParameter('state', $request);
$authorizationRequest = new AuthorizationRequest();
$authorizationRequest->setGrantTypeId($this->getIdentifier());
$authorizationRequest->setClient($client);
$authorizationRequest->setRedirectUri($redirectUri);
if ($stateParameter !== null) {
$authorizationRequest->setState($stateParameter);
}
$authorizationRequest->setScopes($scopes);
$codeChallenge = $this->getQueryStringParameter('code_challenge', $request);
if ($codeChallenge !== null) {
$codeChallengeMethod = $this->getQueryStringParameter('code_challenge_method', $request, 'plain');
if (\array_key_exists($codeChallengeMethod, $this->codeChallengeVerifiers) === false) {
throw OAuthServerException::invalidRequest(
'code_challenge_method',
'Code challenge method must be one of ' . \implode(', ', \array_map(
function ($method) {
return '`' . $method . '`';
},
\array_keys($this->codeChallengeVerifiers)
))
);
}
// Validate code_challenge according to RFC-7636
// @see: https://tools.ietf.org/html/rfc7636#section-4.2
if (\preg_match('/^[A-Za-z0-9-._~]{43,128}$/', $codeChallenge) !== 1) {
throw OAuthServerException::invalidRequest(
'code_challenge',
'Code challenge must follow the specifications of RFC-7636.'
);
}
$authorizationRequest->setCodeChallenge($codeChallenge);
$authorizationRequest->setCodeChallengeMethod($codeChallengeMethod);
} elseif ($this->requireCodeChallengeForPublicClients && !$client->isConfidential()) {
throw OAuthServerException::invalidRequest('code_challenge', 'Code challenge must be provided for public clients');
}
return $authorizationRequest;
}
/**
* {@inheritdoc}
*/
public function completeAuthorizationRequest(AuthorizationRequest $authorizationRequest)
{
if ($authorizationRequest->getUser() instanceof UserEntityInterface === false) {
throw new LogicException('An instance of UserEntityInterface should be set on the AuthorizationRequest');
}
$finalRedirectUri = $authorizationRequest->getRedirectUri()
?? $this->getClientRedirectUri($authorizationRequest);
// The user approved the client, redirect them back with an auth code
if ($authorizationRequest->isAuthorizationApproved() === true) {
$authCode = $this->issueAuthCode(
$this->authCodeTTL,
$authorizationRequest->getClient(),
$authorizationRequest->getUser()->getIdentifier(),
$authorizationRequest->getRedirectUri(),
$authorizationRequest->getScopes()
);
$payload = [
'client_id' => $authCode->getClient()->getIdentifier(),
'redirect_uri' => $authCode->getRedirectUri(),
'auth_code_id' => $authCode->getIdentifier(),
'scopes' => $authCode->getScopes(),
'user_id' => $authCode->getUserIdentifier(),
'expire_time' => (new DateTimeImmutable())->add($this->authCodeTTL)->getTimestamp(),
'code_challenge' => $authorizationRequest->getCodeChallenge(),
'code_challenge_method' => $authorizationRequest->getCodeChallengeMethod(),
];
$jsonPayload = \json_encode($payload);
if ($jsonPayload === false) {
throw new LogicException('An error was encountered when JSON encoding the authorization request response');
}
$response = new RedirectResponse();
$response->setRedirectUri(
$this->makeRedirectUri(
$finalRedirectUri,
[
'code' => $this->encrypt($jsonPayload),
'state' => $authorizationRequest->getState(),
]
)
);
return $response;
}
// The user denied the client, redirect them back with an error
throw OAuthServerException::accessDenied(
'The user denied the request',
$this->makeRedirectUri(
$finalRedirectUri,
[
'state' => $authorizationRequest->getState(),
]
)
);
}
/**
* Get the client redirect URI if not set in the request.
*
* @param AuthorizationRequest $authorizationRequest
*
* @return string
*/
private function getClientRedirectUri(AuthorizationRequest $authorizationRequest)
{
return \is_array($authorizationRequest->getClient()->getRedirectUri())
? $authorizationRequest->getClient()->getRedirectUri()[0]
: $authorizationRequest->getClient()->getRedirectUri();
}
}
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