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phorge/src/applications/people/storage/user/PhabricatorUser.php
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PhabricatorUser.php
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<?php
/*
* Copyright 2011 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.
*/
class PhabricatorUser extends PhabricatorUserDAO {
const SESSION_TABLE = 'phabricator_session';
protected $phid;
protected $userName;
protected $realName;
protected $email;
protected $passwordSalt;
protected $passwordHash;
protected $profileImagePHID;
protected $timezoneIdentifier = '';
protected $consoleEnabled = 0;
protected $consoleVisible = 0;
protected $consoleTab = '';
protected $conduitCertificate;
protected $isSystemAgent = 0;
protected $isAdmin = 0;
protected $isDisabled = 0;
private $preferences = null;
public function getProfileImagePHID() {
return nonempty(
$this->profileImagePHID,
PhabricatorEnv::getEnvConfig('user.default-profile-image-phid'));
}
public function getConfiguration() {
return array(
self::CONFIG_AUX_PHID => true,
) + parent::getConfiguration();
}
public function generatePHID() {
return PhabricatorPHID::generateNewPHID(
PhabricatorPHIDConstants::PHID_TYPE_USER);
}
public function setPassword($password) {
if (!$this->getPHID()) {
throw new Exception(
"You can not set a password for an unsaved user because their PHID ".
"is a salt component in the password hash.");
}
if (!strlen($password)) {
$this->setPasswordHash('');
} else {
$this->setPasswordSalt(md5(mt_rand()));
$hash = $this->hashPassword($password);
$this->setPasswordHash($hash);
}
return $this;
}
public function save() {
if (!$this->conduitCertificate) {
$this->conduitCertificate = $this->generateConduitCertificate();
}
$result = parent::save();
PhabricatorSearchUserIndexer::indexUser($this);
return $result;
}
private function generateConduitCertificate() {
$entropy = Filesystem::readRandomBytes(256);
$entropy = base64_encode($entropy);
$entropy = substr($entropy, 0, 255);
return $entropy;
}
public function comparePassword($password) {
if (!strlen($password)) {
return false;
}
if (!strlen($this->getPasswordHash())) {
return false;
}
$password = $this->hashPassword($password);
return ($password === $this->getPasswordHash());
}
private function hashPassword($password) {
$password = $this->getUsername().
$password.
$this->getPHID().
$this->getPasswordSalt();
for ($ii = 0; $ii < 1000; $ii++) {
$password = md5($password);
}
return $password;
}
const CSRF_CYCLE_FREQUENCY = 3600;
const CSRF_TOKEN_LENGTH = 16;
const EMAIL_CYCLE_FREQUENCY = 86400;
const EMAIL_TOKEN_LENGTH = 24;
public function getCSRFToken($offset = 0) {
return $this->generateToken(
time() + (self::CSRF_CYCLE_FREQUENCY * $offset),
self::CSRF_CYCLE_FREQUENCY,
PhabricatorEnv::getEnvConfig('phabricator.csrf-key'),
self::CSRF_TOKEN_LENGTH);
}
public function validateCSRFToken($token) {
// When the user posts a form, we check that it contains a valid CSRF token.
// Tokens cycle each hour (every CSRF_CYLCE_FREQUENCY seconds) and we accept
// either the current token, the next token (users can submit a "future"
// token if you have two web frontends that have some clock skew) or any of
// the last 6 tokens. This means that pages are valid for up to 7 hours.
// There is also some Javascript which periodically refreshes the CSRF
// tokens on each page, so theoretically pages should be valid indefinitely.
// However, this code may fail to run (if the user loses their internet
// connection, or there's a JS problem, or they don't have JS enabled).
// Choosing the size of the window in which we accept old CSRF tokens is
// an issue of balancing concerns between security and usability. We could
// choose a very narrow (e.g., 1-hour) window to reduce vulnerability to
// attacks using captured CSRF tokens, but it's also more likely that real
// users will be affected by this, e.g. if they close their laptop for an
// hour, open it back up, and try to submit a form before the CSRF refresh
// can kick in. Since the user experience of submitting a form with expired
// CSRF is often quite bad (you basically lose data, or it's a big pain to
// recover at least) and I believe we gain little additional protection
// by keeping the window very short (the overwhelming value here is in
// preventing blind attacks, and most attacks which can capture CSRF tokens
// can also just capture authentication information [sniffing networks]
// or act as the user [xss]) the 7 hour default seems like a reasonable
// balance. Other major platforms have much longer CSRF token lifetimes,
// like Rails (session duration) and Django (forever), which suggests this
// is a reasonable analysis.
$csrf_window = 6;
for ($ii = -$csrf_window; $ii <= 1; $ii++) {
$valid = $this->getCSRFToken($ii);
if ($token == $valid) {
return true;
}
}
return false;
}
private function generateToken($epoch, $frequency, $key, $len) {
$time_block = floor($epoch / $frequency);
$vec = $this->getPHID().$this->passwordHash.$key.$time_block;
return substr(sha1($vec), 0, $len);
}
/**
* Issue a new session key to this user. Phabricator supports different
* types of sessions (like "web" and "conduit") and each session type may
* have multiple concurrent sessions (this allows a user to be logged in on
* multiple browsers at the same time, for instance).
*
* Note that this method is transport-agnostic and does not set cookies or
* issue other types of tokens, it ONLY generates a new session key.
*
* You can configure the maximum number of concurrent sessions for various
* session types in the Phabricator configuration.
*
* @param string Session type, like "web".
* @return string Newly generated session key.
*/
public function establishSession($session_type) {
$conn_w = $this->establishConnection('w');
if (strpos($session_type, '-') !== false) {
throw new Exception("Session type must not contain hyphen ('-')!");
}
// We allow multiple sessions of the same type, so when a caller requests
// a new session of type "web", we give them the first available session in
// "web-1", "web-2", ..., "web-N", up to some configurable limit. If none
// of these sessions is available, we overwrite the oldest session and
// reissue a new one in its place.
$session_limit = 1;
switch ($session_type) {
case 'web':
$session_limit = PhabricatorEnv::getEnvConfig('auth.sessions.web');
break;
case 'conduit':
$session_limit = PhabricatorEnv::getEnvConfig('auth.sessions.conduit');
break;
default:
throw new Exception("Unknown session type '{$session_type}'!");
}
$session_limit = (int)$session_limit;
if ($session_limit <= 0) {
throw new Exception(
"Session limit for '{$session_type}' must be at least 1!");
}
// Load all the currently active sessions.
$sessions = queryfx_all(
$conn_w,
'SELECT type, sessionStart FROM %T WHERE userPHID = %s AND type LIKE %>',
PhabricatorUser::SESSION_TABLE,
$this->getPHID(),
$session_type.'-');
// Choose which 'type' we'll actually establish, i.e. what number we're
// going to append to the basic session type. To do this, just check all
// the numbers sequentially until we find an available session.
$establish_type = null;
$sessions = ipull($sessions, null, 'type');
for ($ii = 1; $ii <= $session_limit; $ii++) {
if (empty($sessions[$session_type.'-'.$ii])) {
$establish_type = $session_type.'-'.$ii;
break;
}
}
// If we didn't find an available session, choose the oldest session and
// overwrite it.
if (!$establish_type) {
$sessions = isort($sessions, 'sessionStart');
$oldest = reset($sessions);
$establish_type = $oldest['type'];
}
// Consume entropy to generate a new session key, forestalling the eventual
// heat death of the universe.
$entropy = Filesystem::readRandomBytes(20);
$session_key = sha1($entropy);
// UNGUARDED WRITES: Logging-in users don't have CSRF stuff yet.
$unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
queryfx(
$conn_w,
'INSERT INTO %T '.
'(userPHID, type, sessionKey, sessionStart)'.
' VALUES '.
'(%s, %s, %s, UNIX_TIMESTAMP()) '.
'ON DUPLICATE KEY UPDATE '.
'sessionKey = VALUES(sessionKey), '.
'sessionStart = VALUES(sessionStart)',
self::SESSION_TABLE,
$this->getPHID(),
$establish_type,
$session_key);
$log = PhabricatorUserLog::newLog(
$this,
$this,
PhabricatorUserLog::ACTION_LOGIN);
$log->setDetails(
array(
'session_type' => $session_type,
'session_issued' => $establish_type,
));
$log->setSession($session_key);
$log->save();
return $session_key;
}
private function generateEmailToken($offset = 0) {
return $this->generateToken(
time() + ($offset * self::EMAIL_CYCLE_FREQUENCY),
self::EMAIL_CYCLE_FREQUENCY,
PhabricatorEnv::getEnvConfig('phabricator.csrf-key').$this->getEmail(),
self::EMAIL_TOKEN_LENGTH);
}
public function validateEmailToken($token) {
for ($ii = -1; $ii <= 1; $ii++) {
$valid = $this->generateEmailToken($ii);
if ($token == $valid) {
return true;
}
}
return false;
}
public function getEmailLoginURI() {
$token = $this->generateEmailToken();
$uri = PhabricatorEnv::getProductionURI('/login/etoken/'.$token.'/');
$uri = new PhutilURI($uri);
return $uri->alter('email', $this->getEmail());
}
public function loadPreferences() {
if ($this->preferences) {
return $this->preferences;
}
$preferences = id(new PhabricatorUserPreferences())->loadOneWhere(
'userPHID = %s',
$this->getPHID());
if (!$preferences) {
$preferences = new PhabricatorUserPreferences();
$preferences->setUserPHID($this->getPHID());
$default_dict = array(
PhabricatorUserPreferences::PREFERENCE_TITLES => 'glyph',
PhabricatorUserPreferences::PREFERENCE_MONOSPACED => '');
$preferences->setPreferences($default_dict);
}
$this->preferences = $preferences;
return $preferences;
}
public function getTimezoneIdentifier() {
// If the user hasn't set one, guess the server's time.
return nonempty(
$this->timezoneIdentifier,
date_default_timezone_get());
}
}

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