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phab/src/applications/auth/engine/PhabricatorAuthSessionEngine.php
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PhabricatorAuthSessionEngine.php
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<?php
/**
*
* @task use Using Sessions
* @task new Creating Sessions
* @task hisec High Security
* @task partial Partial Sessions
* @task onetime One Time Login URIs
*/
final class PhabricatorAuthSessionEngine extends Phobject {
/**
* Session issued to normal users after they login through a standard channel.
* Associates the client with a standard user identity.
*/
const KIND_USER = 'U';
/**
* Session issued to users who login with some sort of credentials but do not
* have full accounts. These are sometimes called "grey users".
*
* TODO: We do not currently issue these sessions, see T4310.
*/
const KIND_EXTERNAL = 'X';
/**
* Session issued to logged-out users which has no real identity information.
* Its purpose is to protect logged-out users from CSRF.
*/
const KIND_ANONYMOUS = 'A';
/**
* Session kind isn't known.
*/
const KIND_UNKNOWN = '?';
const ONETIME_RECOVER = 'recover';
const ONETIME_RESET = 'reset';
const ONETIME_WELCOME = 'welcome';
const ONETIME_USERNAME = 'rename';
/**
* Get the session kind (e.g., anonymous, user, external account) from a
* session token. Returns a `KIND_` constant.
*
* @param string Session token.
* @return const Session kind constant.
*/
public static function getSessionKindFromToken($session_token) {
if (strpos($session_token, '/') === false) {
// Old-style session, these are all user sessions.
return self::KIND_USER;
}
list($kind, $key) = explode('/', $session_token, 2);
switch ($kind) {
case self::KIND_ANONYMOUS:
case self::KIND_USER:
case self::KIND_EXTERNAL:
return $kind;
default:
return self::KIND_UNKNOWN;
}
}
/**
* Load the user identity associated with a session of a given type,
* identified by token.
*
* When the user presents a session token to an API, this method verifies
* it is of the correct type and loads the corresponding identity if the
* session exists and is valid.
*
* NOTE: `$session_type` is the type of session that is required by the
* loading context. This prevents use of a Conduit sesssion as a Web
* session, for example.
*
* @param const The type of session to load.
* @param string The session token.
* @return PhabricatorUser|null
* @task use
*/
public function loadUserForSession($session_type, $session_token) {
$session_kind = self::getSessionKindFromToken($session_token);
switch ($session_kind) {
case self::KIND_ANONYMOUS:
// Don't bother trying to load a user for an anonymous session, since
// neither the session nor the user exist.
return null;
case self::KIND_UNKNOWN:
// If we don't know what kind of session this is, don't go looking for
// it.
return null;
case self::KIND_USER:
break;
case self::KIND_EXTERNAL:
// TODO: Implement these (T4310).
return null;
}
$session_table = new PhabricatorAuthSession();
$user_table = new PhabricatorUser();
$conn_r = $session_table->establishConnection('r');
$session_key = PhabricatorHash::digest($session_token);
// NOTE: We're being clever here because this happens on every page load,
// and by joining we can save a query. This might be getting too clever
// for its own good, though...
$info = queryfx_one(
$conn_r,
'SELECT
s.id AS s_id,
s.sessionExpires AS s_sessionExpires,
s.sessionStart AS s_sessionStart,
s.highSecurityUntil AS s_highSecurityUntil,
s.isPartial AS s_isPartial,
s.signedLegalpadDocuments as s_signedLegalpadDocuments,
u.*
FROM %T u JOIN %T s ON u.phid = s.userPHID
AND s.type = %s AND s.sessionKey = %s',
$user_table->getTableName(),
$session_table->getTableName(),
$session_type,
$session_key);
if (!$info) {
return null;
}
$session_dict = array(
'userPHID' => $info['phid'],
'sessionKey' => $session_key,
'type' => $session_type,
);
foreach ($info as $key => $value) {
if (strncmp($key, 's_', 2) === 0) {
unset($info[$key]);
$session_dict[substr($key, 2)] = $value;
}
}
$user = $user_table->loadFromArray($info);
switch ($session_type) {
case PhabricatorAuthSession::TYPE_WEB:
// Explicitly prevent bots and mailing lists from establishing web
// sessions. It's normally impossible to attach authentication to these
// accounts, and likewise impossible to generate sessions, but it's
// technically possible that a session could exist in the database. If
// one does somehow, refuse to load it.
if (!$user->canEstablishWebSessions()) {
return null;
}
break;
}
$session = id(new PhabricatorAuthSession())->loadFromArray($session_dict);
$ttl = PhabricatorAuthSession::getSessionTypeTTL($session_type);
// If more than 20% of the time on this session has been used, refresh the
// TTL back up to the full duration. The idea here is that sessions are
// good forever if used regularly, but get GC'd when they fall out of use.
// NOTE: If we begin rotating session keys when extending sessions, the
// CSRF code needs to be updated so CSRF tokens survive session rotation.
if (time() + (0.80 * $ttl) > $session->getSessionExpires()) {
$unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
$conn_w = $session_table->establishConnection('w');
queryfx(
$conn_w,
'UPDATE %T SET sessionExpires = UNIX_TIMESTAMP() + %d WHERE id = %d',
$session->getTableName(),
$ttl,
$session->getID());
unset($unguarded);
}
$user->attachSession($session);
return $user;
}
/**
* Issue a new session key for a given identity. Phabricator supports
* different types of sessions (like "web" and "conduit") and each session
* type may have multiple concurrent sessions (this allows a user to be
* logged in on multiple browsers at the same time, for instance).
*
* Note that this method is transport-agnostic and does not set cookies or
* issue other types of tokens, it ONLY generates a new session key.
*
* You can configure the maximum number of concurrent sessions for various
* session types in the Phabricator configuration.
*
* @param const Session type constant (see
* @{class:PhabricatorAuthSession}).
* @param phid|null Identity to establish a session for, usually a user
* PHID. With `null`, generates an anonymous session.
* @param bool True to issue a partial session.
* @return string Newly generated session key.
*/
public function establishSession($session_type, $identity_phid, $partial) {
// Consume entropy to generate a new session key, forestalling the eventual
// heat death of the universe.
$session_key = Filesystem::readRandomCharacters(40);
if ($identity_phid === null) {
return self::KIND_ANONYMOUS.'/'.$session_key;
}
$session_table = new PhabricatorAuthSession();
$conn_w = $session_table->establishConnection('w');
// This has a side effect of validating the session type.
$session_ttl = PhabricatorAuthSession::getSessionTypeTTL($session_type);
$digest_key = PhabricatorHash::digest($session_key);
// Logging-in users don't have CSRF stuff yet, so we have to unguard this
// write.
$unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
id(new PhabricatorAuthSession())
->setUserPHID($identity_phid)
->setType($session_type)
->setSessionKey($digest_key)
->setSessionStart(time())
->setSessionExpires(time() + $session_ttl)
->setIsPartial($partial ? 1 : 0)
->setSignedLegalpadDocuments(0)
->save();
$log = PhabricatorUserLog::initializeNewLog(
null,
$identity_phid,
($partial
? PhabricatorUserLog::ACTION_LOGIN_PARTIAL
: PhabricatorUserLog::ACTION_LOGIN));
$log->setDetails(
array(
'session_type' => $session_type,
));
$log->setSession($digest_key);
$log->save();
unset($unguarded);
return $session_key;
}
/**
* Terminate all of a user's login sessions.
*
* This is used when users change passwords, linked accounts, or add
* multifactor authentication.
*
* @param PhabricatorUser User whose sessions should be terminated.
* @param string|null Optionally, one session to keep. Normally, the current
* login session.
*
* @return void
*/
public function terminateLoginSessions(
PhabricatorUser $user,
$except_session = null) {
$sessions = id(new PhabricatorAuthSessionQuery())
->setViewer($user)
->withIdentityPHIDs(array($user->getPHID()))
->execute();
if ($except_session !== null) {
$except_session = PhabricatorHash::digest($except_session);
}
foreach ($sessions as $key => $session) {
if ($except_session !== null) {
$is_except = phutil_hashes_are_identical(
$session->getSessionKey(),
$except_session);
if ($is_except) {
continue;
}
}
$session->delete();
}
}
public function logoutSession(
PhabricatorUser $user,
PhabricatorAuthSession $session) {
$log = PhabricatorUserLog::initializeNewLog(
$user,
$user->getPHID(),
PhabricatorUserLog::ACTION_LOGOUT);
$log->save();
$extensions = PhabricatorAuthSessionEngineExtension::getAllExtensions();
foreach ($extensions as $extension) {
$extension->didLogout($user, array($session));
}
$session->delete();
}
/* -( High Security )------------------------------------------------------ */
/**
* Require high security, or prompt the user to enter high security.
*
* If the user's session is in high security, this method will return a
* token. Otherwise, it will throw an exception which will eventually
* be converted into a multi-factor authentication workflow.
*
* @param PhabricatorUser User whose session needs to be in high security.
* @param AphrontReqeust Current request.
* @param string URI to return the user to if they cancel.
* @param bool True to jump partial sessions directly into high
* security instead of just upgrading them to full
* sessions.
* @return PhabricatorAuthHighSecurityToken Security token.
* @task hisec
*/
public function requireHighSecuritySession(
PhabricatorUser $viewer,
AphrontRequest $request,
$cancel_uri,
$jump_into_hisec = false) {
if (!$viewer->hasSession()) {
throw new Exception(
pht('Requiring a high-security session from a user with no session!'));
}
$session = $viewer->getSession();
// Check if the session is already in high security mode.
$token = $this->issueHighSecurityToken($session);
if ($token) {
return $token;
}
// Load the multi-factor auth sources attached to this account.
$factors = id(new PhabricatorAuthFactorConfig())->loadAllWhere(
'userPHID = %s',
$viewer->getPHID());
// If the account has no associated multi-factor auth, just issue a token
// without putting the session into high security mode. This is generally
// easier for users. A minor but desirable side effect is that when a user
// adds an auth factor, existing sessions won't get a free pass into hisec,
// since they never actually got marked as hisec.
if (!$factors) {
return $this->issueHighSecurityToken($session, true);
}
// Check for a rate limit without awarding points, so the user doesn't
// get partway through the workflow only to get blocked.
PhabricatorSystemActionEngine::willTakeAction(
array($viewer->getPHID()),
new PhabricatorAuthTryFactorAction(),
0);
$validation_results = array();
if ($request->isHTTPPost()) {
$request->validateCSRF();
if ($request->getExists(AphrontRequest::TYPE_HISEC)) {
// Limit factor verification rates to prevent brute force attacks.
PhabricatorSystemActionEngine::willTakeAction(
array($viewer->getPHID()),
new PhabricatorAuthTryFactorAction(),
1);
$ok = true;
foreach ($factors as $factor) {
$id = $factor->getID();
$impl = $factor->requireImplementation();
$validation_results[$id] = $impl->processValidateFactorForm(
$factor,
$viewer,
$request);
if (!$impl->isFactorValid($factor, $validation_results[$id])) {
$ok = false;
}
}
if ($ok) {
// Give the user a credit back for a successful factor verification.
PhabricatorSystemActionEngine::willTakeAction(
array($viewer->getPHID()),
new PhabricatorAuthTryFactorAction(),
-1);
if ($session->getIsPartial() && !$jump_into_hisec) {
// If we have a partial session and are not jumping directly into
// hisec, just issue a token without putting it in high security
// mode.
return $this->issueHighSecurityToken($session, true);
}
$until = time() + phutil_units('15 minutes in seconds');
$session->setHighSecurityUntil($until);
queryfx(
$session->establishConnection('w'),
'UPDATE %T SET highSecurityUntil = %d WHERE id = %d',
$session->getTableName(),
$until,
$session->getID());
$log = PhabricatorUserLog::initializeNewLog(
$viewer,
$viewer->getPHID(),
PhabricatorUserLog::ACTION_ENTER_HISEC);
$log->save();
} else {
$log = PhabricatorUserLog::initializeNewLog(
$viewer,
$viewer->getPHID(),
PhabricatorUserLog::ACTION_FAIL_HISEC);
$log->save();
}
}
}
$token = $this->issueHighSecurityToken($session);
if ($token) {
return $token;
}
throw id(new PhabricatorAuthHighSecurityRequiredException())
->setCancelURI($cancel_uri)
->setFactors($factors)
->setFactorValidationResults($validation_results);
}
/**
* Issue a high security token for a session, if authorized.
*
* @param PhabricatorAuthSession Session to issue a token for.
* @param bool Force token issue.
* @return PhabricatorAuthHighSecurityToken|null Token, if authorized.
* @task hisec
*/
private function issueHighSecurityToken(
PhabricatorAuthSession $session,
$force = false) {
$until = $session->getHighSecurityUntil();
if ($until > time() || $force) {
return new PhabricatorAuthHighSecurityToken();
}
return null;
}
/**
* Render a form for providing relevant multi-factor credentials.
*
* @param PhabricatorUser Viewing user.
* @param AphrontRequest Current request.
* @return AphrontFormView Renderable form.
* @task hisec
*/
public function renderHighSecurityForm(
array $factors,
array $validation_results,
PhabricatorUser $viewer,
AphrontRequest $request) {
$form = id(new AphrontFormView())
->setUser($viewer)
->appendRemarkupInstructions('');
foreach ($factors as $factor) {
$factor->requireImplementation()->renderValidateFactorForm(
$factor,
$form,
$viewer,
idx($validation_results, $factor->getID()));
}
$form->appendRemarkupInstructions('');
return $form;
}
/**
* Strip the high security flag from a session.
*
* Kicks a session out of high security and logs the exit.
*
* @param PhabricatorUser Acting user.
* @param PhabricatorAuthSession Session to return to normal security.
* @return void
* @task hisec
*/
public function exitHighSecurity(
PhabricatorUser $viewer,
PhabricatorAuthSession $session) {
if (!$session->getHighSecurityUntil()) {
return;
}
queryfx(
$session->establishConnection('w'),
'UPDATE %T SET highSecurityUntil = NULL WHERE id = %d',
$session->getTableName(),
$session->getID());
$log = PhabricatorUserLog::initializeNewLog(
$viewer,
$viewer->getPHID(),
PhabricatorUserLog::ACTION_EXIT_HISEC);
$log->save();
}
/* -( Partial Sessions )--------------------------------------------------- */
/**
* Upgrade a partial session to a full session.
*
* @param PhabricatorAuthSession Session to upgrade.
* @return void
* @task partial
*/
public function upgradePartialSession(PhabricatorUser $viewer) {
if (!$viewer->hasSession()) {
throw new Exception(
pht('Upgrading partial session of user with no session!'));
}
$session = $viewer->getSession();
if (!$session->getIsPartial()) {
throw new Exception(pht('Session is not partial!'));
}
$unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
$session->setIsPartial(0);
queryfx(
$session->establishConnection('w'),
'UPDATE %T SET isPartial = %d WHERE id = %d',
$session->getTableName(),
0,
$session->getID());
$log = PhabricatorUserLog::initializeNewLog(
$viewer,
$viewer->getPHID(),
PhabricatorUserLog::ACTION_LOGIN_FULL);
$log->save();
unset($unguarded);
}
/* -( Legalpad Documents )-------------------------------------------------- */
/**
* Upgrade a session to have all legalpad documents signed.
*
* @param PhabricatorUser User whose session should upgrade.
* @param array LegalpadDocument objects
* @return void
* @task partial
*/
public function signLegalpadDocuments(PhabricatorUser $viewer, array $docs) {
if (!$viewer->hasSession()) {
throw new Exception(
pht('Signing session legalpad documents of user with no session!'));
}
$session = $viewer->getSession();
if ($session->getSignedLegalpadDocuments()) {
throw new Exception(pht(
'Session has already signed required legalpad documents!'));
}
$unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
$session->setSignedLegalpadDocuments(1);
queryfx(
$session->establishConnection('w'),
'UPDATE %T SET signedLegalpadDocuments = %d WHERE id = %d',
$session->getTableName(),
1,
$session->getID());
if (!empty($docs)) {
$log = PhabricatorUserLog::initializeNewLog(
$viewer,
$viewer->getPHID(),
PhabricatorUserLog::ACTION_LOGIN_LEGALPAD);
$log->save();
}
unset($unguarded);
}
/* -( One Time Login URIs )------------------------------------------------ */
/**
* Retrieve a temporary, one-time URI which can log in to an account.
*
* These URIs are used for password recovery and to regain access to accounts
* which users have been locked out of.
*
* @param PhabricatorUser User to generate a URI for.
* @param PhabricatorUserEmail Optionally, email to verify when
* link is used.
* @param string Optional context string for the URI. This is purely cosmetic
* and used only to customize workflow and error messages.
* @return string Login URI.
* @task onetime
*/
public function getOneTimeLoginURI(
PhabricatorUser $user,
PhabricatorUserEmail $email = null,
$type = self::ONETIME_RESET) {
$key = Filesystem::readRandomCharacters(32);
$key_hash = $this->getOneTimeLoginKeyHash($user, $email, $key);
$onetime_type = PhabricatorAuthOneTimeLoginTemporaryTokenType::TOKENTYPE;
$unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
id(new PhabricatorAuthTemporaryToken())
->setTokenResource($user->getPHID())
->setTokenType($onetime_type)
->setTokenExpires(time() + phutil_units('1 day in seconds'))
->setTokenCode($key_hash)
->save();
unset($unguarded);
$uri = '/login/once/'.$type.'/'.$user->getID().'/'.$key.'/';
if ($email) {
$uri = $uri.$email->getID().'/';
}
try {
$uri = PhabricatorEnv::getProductionURI($uri);
} catch (Exception $ex) {
// If a user runs `bin/auth recover` before configuring the base URI,
// just show the path. We don't have any way to figure out the domain.
// See T4132.
}
return $uri;
}
/**
* Load the temporary token associated with a given one-time login key.
*
* @param PhabricatorUser User to load the token for.
* @param PhabricatorUserEmail Optionally, email to verify when
* link is used.
* @param string Key user is presenting as a valid one-time login key.
* @return PhabricatorAuthTemporaryToken|null Token, if one exists.
* @task onetime
*/
public function loadOneTimeLoginKey(
PhabricatorUser $user,
PhabricatorUserEmail $email = null,
$key = null) {
$key_hash = $this->getOneTimeLoginKeyHash($user, $email, $key);
$onetime_type = PhabricatorAuthOneTimeLoginTemporaryTokenType::TOKENTYPE;
return id(new PhabricatorAuthTemporaryTokenQuery())
->setViewer($user)
->withTokenResources(array($user->getPHID()))
->withTokenTypes(array($onetime_type))
->withTokenCodes(array($key_hash))
->withExpired(false)
->executeOne();
}
/**
* Hash a one-time login key for storage as a temporary token.
*
* @param PhabricatorUser User this key is for.
* @param PhabricatorUserEmail Optionally, email to verify when
* link is used.
* @param string The one time login key.
* @return string Hash of the key.
* task onetime
*/
private function getOneTimeLoginKeyHash(
PhabricatorUser $user,
PhabricatorUserEmail $email = null,
$key = null) {
$parts = array(
$key,
$user->getAccountSecret(),
);
if ($email) {
$parts[] = $email->getVerificationCode();
}
return PhabricatorHash::digest(implode(':', $parts));
}
}
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