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PhabricatorCookies.php
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Tue, Nov 26, 11:15

PhabricatorCookies.php
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<?php
/**
* Consolidates Phabricator application cookies, including registration
* and session management.
*
* @task clientid Client ID Cookie
* @task next Next URI Cookie
*/
final class PhabricatorCookies extends Phobject {
/**
* Stores the login username for password authentication. This is just a
* display value for convenience, used to prefill the login form. It is not
* authoritative.
*/
const COOKIE_USERNAME = 'phusr';
/**
* Stores the user's current session ID. This is authoritative and establishes
* the user's identity.
*/
const COOKIE_SESSION = 'phsid';
/**
* Stores a secret used during new account registration to prevent an attacker
* from tricking a victim into registering an account which is linked to
* credentials the attacker controls.
*/
const COOKIE_REGISTRATION = 'phreg';
/**
* Stores a secret used during OAuth2 handshakes to prevent various attacks
* where an attacker hands a victim a URI corresponding to the middle of an
* OAuth2 workflow and we might otherwise do something sketchy. Particularly,
* this corresponds to the OAuth2 "code".
*/
const COOKIE_CLIENTID = 'phcid';
/**
* Stores the URI to redirect the user to after login. This allows users to
* visit a path like `/feed/`, be prompted to login, and then be redirected
* back to `/feed/` after the workflow completes.
*/
const COOKIE_NEXTURI = 'next_uri';
/**
* Stores a hint that the user should be moved directly into high security
* after upgrading a partial login session. This is used during password
* recovery to avoid a double-prompt.
*/
const COOKIE_HISEC = 'jump_to_hisec';
/* -( Client ID Cookie )--------------------------------------------------- */
/**
* Set the client ID cookie. This is a random cookie used like a CSRF value
* during authentication workflows.
*
* @param AphrontRequest Request to modify.
* @return void
* @task clientid
*/
public static function setClientIDCookie(AphrontRequest $request) {
// NOTE: See T3471 for some discussion. Some browsers and browser extensions
// can make duplicate requests, so we overwrite this cookie only if it is
// not present in the request. The cookie lifetime is limited by making it
// temporary and clearing it when users log out.
$value = $request->getCookie(self::COOKIE_CLIENTID);
if (!strlen($value)) {
$request->setTemporaryCookie(
self::COOKIE_CLIENTID,
Filesystem::readRandomCharacters(16));
}
}
/* -( Next URI Cookie )---------------------------------------------------- */
/**
* Set the Next URI cookie. We only write the cookie if it wasn't recently
* written, to avoid writing over a real URI with a bunch of "humans.txt"
* stuff. See T3793 for discussion.
*
* @param AphrontRequest Request to write to.
* @param string URI to write.
* @param bool Write this cookie even if we have a fresh
* cookie already.
* @return void
*
* @task next
*/
public static function setNextURICookie(
AphrontRequest $request,
$next_uri,
$force = false) {
if (!$force) {
$cookie_value = $request->getCookie(self::COOKIE_NEXTURI);
list($set_at, $current_uri) = self::parseNextURICookie($cookie_value);
// If the cookie was set within the last 2 minutes, don't overwrite it.
// Primarily, this prevents browser requests for resources which do not
// exist (like "humans.txt" and various icons) from overwriting a normal
// URI like "/feed/".
if ($set_at > (time() - 120)) {
return;
}
}
$new_value = time().','.$next_uri;
$request->setTemporaryCookie(self::COOKIE_NEXTURI, $new_value);
}
/**
* Read the URI out of the Next URI cookie.
*
* @param AphrontRequest Request to examine.
* @return string|null Next URI cookie's URI value.
*
* @task next
*/
public static function getNextURICookie(AphrontRequest $request) {
$cookie_value = $request->getCookie(self::COOKIE_NEXTURI);
list($set_at, $next_uri) = self::parseNextURICookie($cookie_value);
return $next_uri;
}
/**
* Parse a Next URI cookie into its components.
*
* @param string Raw cookie value.
* @return list<string> List of timestamp and URI.
*
* @task next
*/
private static function parseNextURICookie($cookie) {
// Old cookies look like: /uri
// New cookies look like: timestamp,/uri
if (!strlen($cookie)) {
return null;
}
if (strpos($cookie, ',') !== false) {
list($timestamp, $uri) = explode(',', $cookie, 2);
return array((int)$timestamp, $uri);
}
return array(0, $cookie);
}
}

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