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PhabricatorAuthChallenge.php
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Wed, Oct 2, 18:41

PhabricatorAuthChallenge.php
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<?php
final class PhabricatorAuthChallenge
extends PhabricatorAuthDAO
implements PhabricatorPolicyInterface {
protected $userPHID;
protected $factorPHID;
protected $sessionPHID;
protected $workflowKey;
protected $challengeKey;
protected $challengeTTL;
protected $responseDigest;
protected $responseTTL;
protected $isCompleted;
protected $properties = array();
private $responseToken;
const HTTPKEY = '__hisec.challenges__';
const TOKEN_DIGEST_KEY = 'auth.challenge.token';
public static function initializeNewChallenge() {
return id(new self())
->setIsCompleted(0);
}
public static function newHTTPParametersFromChallenges(array $challenges) {
assert_instances_of($challenges, __CLASS__);
$token_list = array();
foreach ($challenges as $challenge) {
$token = $challenge->getResponseToken();
if ($token) {
$token_list[] = sprintf(
'%s:%s',
$challenge->getPHID(),
$token->openEnvelope());
}
}
if (!$token_list) {
return array();
}
$token_list = implode(' ', $token_list);
return array(
self::HTTPKEY => $token_list,
);
}
public static function newChallengeResponsesFromRequest(
array $challenges,
AphrontRequest $request) {
assert_instances_of($challenges, __CLASS__);
$token_list = $request->getStr(self::HTTPKEY);
$token_list = explode(' ', $token_list);
$token_map = array();
foreach ($token_list as $token_element) {
$token_element = trim($token_element, ' ');
if (!strlen($token_element)) {
continue;
}
// NOTE: This error message is intentionally not printing the token to
// avoid disclosing it. As a result, it isn't terribly useful, but no
// normal user should ever end up here.
if (!preg_match('/^[^:]+:/', $token_element)) {
throw new Exception(
pht(
'This request included an improperly formatted MFA challenge '.
'token and can not be processed.'));
}
list($phid, $token) = explode(':', $token_element, 2);
if (isset($token_map[$phid])) {
throw new Exception(
pht(
'This request improperly specifies an MFA challenge token ("%s") '.
'multiple times and can not be processed.',
$phid));
}
$token_map[$phid] = new PhutilOpaqueEnvelope($token);
}
$challenges = mpull($challenges, null, 'getPHID');
$now = PhabricatorTime::getNow();
foreach ($challenges as $challenge_phid => $challenge) {
// If the response window has expired, don't attach the token.
if ($challenge->getResponseTTL() < $now) {
continue;
}
$token = idx($token_map, $challenge_phid);
if (!$token) {
continue;
}
$challenge->setResponseToken($token);
}
}
protected function getConfiguration() {
return array(
self::CONFIG_SERIALIZATION => array(
'properties' => self::SERIALIZATION_JSON,
),
self::CONFIG_AUX_PHID => true,
self::CONFIG_COLUMN_SCHEMA => array(
'challengeKey' => 'text255',
'challengeTTL' => 'epoch',
'workflowKey' => 'text255',
'responseDigest' => 'text255?',
'responseTTL' => 'epoch?',
'isCompleted' => 'bool',
),
self::CONFIG_KEY_SCHEMA => array(
'key_issued' => array(
'columns' => array('userPHID', 'challengeTTL'),
),
'key_collection' => array(
'columns' => array('challengeTTL'),
),
),
) + parent::getConfiguration();
}
public function getPHIDType() {
return PhabricatorAuthChallengePHIDType::TYPECONST;
}
public function getIsReusedChallenge() {
if ($this->getIsCompleted()) {
return true;
}
if (!$this->getIsAnsweredChallenge()) {
return false;
}
// If the challenge has been answered but the client has provided a token
// proving that they answered it, this is still a valid response.
if ($this->getResponseToken()) {
return false;
}
return true;
}
public function getIsAnsweredChallenge() {
return (bool)$this->getResponseDigest();
}
public function markChallengeAsAnswered($ttl) {
$token = Filesystem::readRandomCharacters(32);
$token = new PhutilOpaqueEnvelope($token);
$unguarded = AphrontWriteGuard::beginScopedUnguardedWrites();
$this
->setResponseToken($token)
->setResponseTTL($ttl)
->save();
unset($unguarded);
return $this;
}
public function markChallengeAsCompleted() {
return $this
->setIsCompleted(true)
->save();
}
public function setResponseToken(PhutilOpaqueEnvelope $token) {
if (!$this->getUserPHID()) {
throw new PhutilInvalidStateException('setUserPHID');
}
if ($this->responseToken) {
throw new Exception(
pht(
'This challenge already has a response token; you can not '.
'set a new response token.'));
}
if (preg_match('/ /', $token->openEnvelope())) {
throw new Exception(
pht(
'The response token for this challenge is invalid: response '.
'tokens may not include spaces.'));
}
$digest = PhabricatorHash::digestWithNamedKey(
$token->openEnvelope(),
self::TOKEN_DIGEST_KEY);
if ($this->responseDigest !== null) {
if (!phutil_hashes_are_identical($digest, $this->responseDigest)) {
throw new Exception(
pht(
'Invalid response token for this challenge: token digest does '.
'not match stored digest.'));
}
} else {
$this->responseDigest = $digest;
}
$this->responseToken = $token;
return $this;
}
public function getResponseToken() {
return $this->responseToken;
}
public function setResponseDigest($value) {
throw new Exception(
pht(
'You can not set the response digest for a challenge directly. '.
'Instead, set a response token. A response digest will be computed '.
'automatically.'));
}
public function setProperty($key, $value) {
$this->properties[$key] = $value;
return $this;
}
public function getProperty($key, $default = null) {
return $this->properties[$key];
}
/* -( PhabricatorPolicyInterface )----------------------------------------- */
public function getCapabilities() {
return array(
PhabricatorPolicyCapability::CAN_VIEW,
);
}
public function getPolicy($capability) {
return PhabricatorPolicies::POLICY_NOONE;
}
public function hasAutomaticCapability($capability, PhabricatorUser $viewer) {
return ($viewer->getPHID() === $this->getUserPHID());
}
}

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