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PhabricatorOAuthServer.php
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Wed, May 22, 08:40

PhabricatorOAuthServer.php
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<?php
/**
* Implements core OAuth 2.0 Server logic.
*
* This class should be used behind business logic that parses input to
* determine pertinent @{class:PhabricatorUser} $user,
* @{class:PhabricatorOAuthServerClient} $client(s),
* @{class:PhabricatorOAuthServerAuthorizationCode} $code(s), and.
* @{class:PhabricatorOAuthServerAccessToken} $token(s).
*
* For an OAuth 2.0 server, there are two main steps:
*
* 1) Authorization - the user authorizes a given client to access the data
* the OAuth 2.0 server protects. Once this is achieved / if it has
* been achived already, the OAuth server sends the client an authorization
* code.
* 2) Access Token - the client should send the authorization code received in
* step 1 along with its id and secret to the OAuth server to receive an
* access token. This access token can later be used to access Phabricator
* data on behalf of the user.
*
* @task auth Authorizing @{class:PhabricatorOAuthServerClient}s and
* generating @{class:PhabricatorOAuthServerAuthorizationCode}s
* @task token Validating @{class:PhabricatorOAuthServerAuthorizationCode}s
* and generating @{class:PhabricatorOAuthServerAccessToken}s
* @task internal Internals
*/
final class PhabricatorOAuthServer extends Phobject {
const AUTHORIZATION_CODE_TIMEOUT = 300;
private $user;
private $client;
private function getUser() {
if (!$this->user) {
throw new PhutilInvalidStateException('setUser');
}
return $this->user;
}
public function setUser(PhabricatorUser $user) {
$this->user = $user;
return $this;
}
private function getClient() {
if (!$this->client) {
throw new PhutilInvalidStateException('setClient');
}
return $this->client;
}
public function setClient(PhabricatorOAuthServerClient $client) {
$this->client = $client;
return $this;
}
/**
* @task auth
* @return tuple <bool hasAuthorized, ClientAuthorization or null>
*/
public function userHasAuthorizedClient(array $scope) {
$authorization = id(new PhabricatorOAuthClientAuthorization())
->loadOneWhere(
'userPHID = %s AND clientPHID = %s',
$this->getUser()->getPHID(),
$this->getClient()->getPHID());
if (empty($authorization)) {
return array(false, null);
}
if ($scope) {
$missing_scope = array_diff_key($scope, $authorization->getScope());
} else {
$missing_scope = false;
}
if ($missing_scope) {
return array(false, $authorization);
}
return array(true, $authorization);
}
/**
* @task auth
*/
public function authorizeClient(array $scope) {
$authorization = new PhabricatorOAuthClientAuthorization();
$authorization->setUserPHID($this->getUser()->getPHID());
$authorization->setClientPHID($this->getClient()->getPHID());
$authorization->setScope($scope);
$authorization->save();
return $authorization;
}
/**
* @task auth
*/
public function generateAuthorizationCode(PhutilURI $redirect_uri) {
$code = Filesystem::readRandomCharacters(32);
$client = $this->getClient();
$authorization_code = new PhabricatorOAuthServerAuthorizationCode();
$authorization_code->setCode($code);
$authorization_code->setClientPHID($client->getPHID());
$authorization_code->setClientSecret($client->getSecret());
$authorization_code->setUserPHID($this->getUser()->getPHID());
$authorization_code->setRedirectURI((string)$redirect_uri);
$authorization_code->save();
return $authorization_code;
}
/**
* @task token
*/
public function generateAccessToken() {
$token = Filesystem::readRandomCharacters(32);
$access_token = new PhabricatorOAuthServerAccessToken();
$access_token->setToken($token);
$access_token->setUserPHID($this->getUser()->getPHID());
$access_token->setClientPHID($this->getClient()->getPHID());
$access_token->save();
return $access_token;
}
/**
* @task token
*/
public function validateAuthorizationCode(
PhabricatorOAuthServerAuthorizationCode $test_code,
PhabricatorOAuthServerAuthorizationCode $valid_code) {
// check that all the meta data matches
if ($test_code->getClientPHID() != $valid_code->getClientPHID()) {
return false;
}
if ($test_code->getClientSecret() != $valid_code->getClientSecret()) {
return false;
}
// check that the authorization code hasn't timed out
$created_time = $test_code->getDateCreated();
$must_be_used_by = $created_time + self::AUTHORIZATION_CODE_TIMEOUT;
return (time() < $must_be_used_by);
}
/**
* @task token
*/
public function authorizeToken(
PhabricatorOAuthServerAccessToken $token) {
$user_phid = $token->getUserPHID();
$client_phid = $token->getClientPHID();
$authorization = id(new PhabricatorOAuthClientAuthorizationQuery())
->setViewer(PhabricatorUser::getOmnipotentUser())
->withUserPHIDs(array($user_phid))
->withClientPHIDs(array($client_phid))
->executeOne();
if (!$authorization) {
return null;
}
$application = $authorization->getClient();
if ($application->getIsDisabled()) {
return null;
}
return $authorization;
}
public function validateRedirectURI($uri) {
try {
$this->assertValidRedirectURI($uri);
return true;
} catch (Exception $ex) {
return false;
}
}
/**
* See http://tools.ietf.org/html/draft-ietf-oauth-v2-23#section-3.1.2
* for details on what makes a given redirect URI "valid".
*/
public function assertValidRedirectURI($raw_uri) {
// This covers basics like reasonable formatting and the existence of a
// protocol.
PhabricatorEnv::requireValidRemoteURIForLink($raw_uri);
$uri = new PhutilURI($raw_uri);
$fragment = $uri->getFragment();
if (strlen($fragment)) {
throw new Exception(
pht(
'OAuth application redirect URIs must not contain URI '.
'fragments, but the URI "%s" has a fragment ("%s").',
$raw_uri,
$fragment));
}
$protocol = $uri->getProtocol();
switch ($protocol) {
case 'http':
case 'https':
break;
default:
throw new Exception(
pht(
'OAuth application redirect URIs must only use the "http" or '.
'"https" protocols, but the URI "%s" uses the "%s" protocol.',
$raw_uri,
$protocol));
}
}
/**
* If there's a URI specified in an OAuth request, it must be validated in
* its own right. Further, it must have the same domain, the same path, the
* same port, and (at least) the same query parameters as the primary URI.
*/
public function validateSecondaryRedirectURI(
PhutilURI $secondary_uri,
PhutilURI $primary_uri) {
// The secondary URI must be valid.
if (!$this->validateRedirectURI($secondary_uri)) {
return false;
}
// Both URIs must point at the same domain.
if ($secondary_uri->getDomain() != $primary_uri->getDomain()) {
return false;
}
// Both URIs must have the same path
if ($secondary_uri->getPath() != $primary_uri->getPath()) {
return false;
}
// Both URIs must have the same port
if ($secondary_uri->getPort() != $primary_uri->getPort()) {
return false;
}
// Any query parameters present in the first URI must be exactly present
// in the second URI.
$need_params = $primary_uri->getQueryParamsAsMap();
$have_params = $secondary_uri->getQueryParamsAsMap();
foreach ($need_params as $key => $value) {
if (!array_key_exists($key, $have_params)) {
return false;
}
if ((string)$have_params[$key] != (string)$value) {
return false;
}
}
// If the first URI is HTTPS, the second URI must also be HTTPS. This
// defuses an attack where a third party with control over the network
// tricks you into using HTTP to authenticate over a link which is supposed
// to be HTTPS only and sniffs all your token cookies.
if (strtolower($primary_uri->getProtocol()) == 'https') {
if (strtolower($secondary_uri->getProtocol()) != 'https') {
return false;
}
}
return true;
}
}

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