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PhabricatorOAuthServer.php
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Wed, Nov 27, 13:40

PhabricatorOAuthServer.php
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<?php
/*
* Copyright 2012 Facebook, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* 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
*
* @group oauthserver
*/
final class PhabricatorOAuthServer {
const AUTHORIZATION_CODE_TIMEOUT = 300;
const ACCESS_TOKEN_TIMEOUT = 3600;
private $user;
private $client;
/**
* @group internal
*/
private function getUser() {
if (!$this->user) {
throw new Exception('You must setUser before you can getUser!');
}
return $this->user;
}
public function setUser(PhabricatorUser $user) {
$this->user = $user;
return $this;
}
/**
* @group internal
*/
private function getClient() {
if (!$this->client) {
throw new Exception('You must setClient before you can getClient!');
}
return $this->client;
}
public function setClient(PhabricatorOAuthServerClient $client) {
$this->client = $client;
return $this;
}
/**
* @task auth
*/
public function userHasAuthorizedClient(array $scope) {
$authorization = id(new PhabricatorOAuthClientAuthorization())->
loadOneWhere('userPHID = %s AND clientPHID = %s',
$this->getUser()->getPHID(),
$this->getClient()->getPHID());
if ($scope) {
$missing_scope = array_diff_key($scope,
$authorization->getScope());
} else {
$missing_scope = false;
}
if ($missing_scope) {
return false;
}
return $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 validateAccessToken(
PhabricatorOAuthServerAccessToken $token,
$required_scope) {
$created_time = $token->getDateCreated();
$must_be_used_by = $created_time + self::ACCESS_TOKEN_TIMEOUT;
$expired = time() > $must_be_used_by;
$authorization = id(new PhabricatorOAuthClientAuthorization())
->loadOneWhere(
'userPHID = %s AND clientPHID = %s',
$token->getUserPHID(),
$token->getClientPHID());
if (!$authorization) {
return false;
}
$token_scope = $authorization->getScope();
if (!isset($token_scope[$required_scope])) {
return false;
}
$valid = true;
if ($expired) {
$valid = false;
// check if the scope includes "offline_access", which makes the
// token valid despite being expired
if (isset(
$token_scope[PhabricatorOAuthServerScope::SCOPE_OFFLINE_ACCESS]
)) {
$valid = true;
}
}
return $valid;
}
/**
* 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 validateRedirectURI(PhutilURI $uri) {
if (PhabricatorEnv::isValidRemoteWebResource($uri)) {
if ($uri->getFragment()) {
return false;
}
if ($uri->getDomain()) {
return true;
}
}
return false;
}
/**
* 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 and (at least) the
* same query parameters as the primary URI.
*/
public function validateSecondaryRedirectURI(PhutilURI $secondary_uri,
PhutilURI $primary_uri) {
$valid = $this->validateRedirectURI($secondary_uri);
if ($valid) {
$valid_domain = ($secondary_uri->getDomain() ==
$primary_uri->getDomain());
$good_params = $primary_uri->getQueryParams();
$test_params = $secondary_uri->getQueryParams();
$missing_params = array_diff_key($good_params, $test_params);
$valid = $valid_domain && empty($missing_params);
}
return $valid;
}
}

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