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Code Issues Releases Wiki Activity

Be more strict about "Location:" redirects

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Summary:
Via HackerOne. Chrome (at least) interprets backslashes like forward slashes, so a redirect to "/\evil.com" is the same as a redirect to "//evil.com".

  - Reject local URIs with backslashes (we never generate these).
  - Fully-qualify all "Location:" redirects.
  - Require external redirects to be marked explicitly.

Test Plan:
  - Expanded existing test coverage.
  - Verified that neither Diffusion nor Phriction can generate URIs with backslashes (they are escaped in Diffusion, and removed by slugging in Phriction).
  - Logged in with Facebook (OAuth2 submits a form to the external site, and isn't affected) and Twitter (OAuth1 redirects, and is affected).
  - Went through some local redirects (login, save-an-object).
  - Verified file still work.

Reviewers: btrahan

Reviewed By: btrahan

Subscribers: epriestley

Differential Revision: https://secure.phabricator.com/D10291
This commit is contained in:
epriestley 2014-08-18 14:11:06 -07:00
parent fe042def42
commit df361470c1
10 changed files with 183 additions and 6 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
src/__phutil_library_map__.php
View file

@ -76,6 +76,7 @@ phutil_register_library_map(array(
'AphrontProgressBarView' => 'view/widget/bars/AphrontProgressBarView.php',
'AphrontProxyResponse' => 'aphront/response/AphrontProxyResponse.php',
'AphrontRedirectResponse' => 'aphront/response/AphrontRedirectResponse.php',
'AphrontRedirectResponseTestCase' => 'aphront/response/__tests__/AphrontRedirectResponseTestCase.php',
'AphrontReloadResponse' => 'aphront/response/AphrontReloadResponse.php',
'AphrontRequest' => 'aphront/AphrontRequest.php',
'AphrontRequestFailureView' => 'view/page/AphrontRequestFailureView.php',
@ -2836,6 +2837,7 @@ phutil_register_library_map(array(
'AphrontProgressBarView' => 'AphrontBarView',
'AphrontProxyResponse' => 'AphrontResponse',
'AphrontRedirectResponse' => 'AphrontResponse',
'AphrontRedirectResponseTestCase' => 'PhabricatorTestCase',
'AphrontReloadResponse' => 'AphrontRedirectResponse',
'AphrontRequestFailureView' => 'AphrontView',
'AphrontRequestTestCase' => 'PhabricatorTestCase',

82
src/aphront/response/AphrontRedirectResponse.php
View file

@ -7,6 +7,12 @@ class AphrontRedirectResponse extends AphrontResponse {
private $uri;
private $stackWhenCreated;
private $isExternal;
public function setIsExternal($external) {
$this->isExternal = $external;
return $this;
}
public function __construct() {
if ($this->shouldStopForDebugging()) {
@ -21,7 +27,10 @@ class AphrontRedirectResponse extends AphrontResponse {
}
public function getURI() {
return (string)$this->uri;
// NOTE: When we convert a RedirectResponse into an AjaxResponse, we pull
// the URI through this method. Make sure it passes checks before we
// hand it over to callers.
return self::getURIForRedirect($this->uri, $this->isExternal);
}
public function shouldStopForDebugging() {
@ -31,7 +40,8 @@ class AphrontRedirectResponse extends AphrontResponse {
public function getHeaders() {
$headers = array();
if (!$this->shouldStopForDebugging()) {
$headers[] = array('Location', $this->uri);
$uri = self::getURIForRedirect($this->uri, $this->isExternal);
$headers[] = array('Location', $uri);
}
$headers = array_merge(parent::getHeaders(), $headers);
return $headers;
@ -85,4 +95,72 @@ class AphrontRedirectResponse extends AphrontResponse {
return '';
}
/**
* Format a URI for use in a "Location:" header.
*
* Verifies that a URI redirects to the expected type of resource (local or
* remote) and formats it for use in a "Location:" header.
*
* The HTTP spec says "Location:" headers must use absolute URIs. Although
* browsers work with relative URIs, we return absolute URIs to avoid
* ambiguity. For example, Chrome interprets "Location: /\evil.com" to mean
* "perform a protocol-relative redirect to evil.com".
*
* @param string URI to redirect to.
* @param bool True if this URI identifies a remote resource.
* @return string URI for use in a "Location:" header.
*/
public static function getURIForRedirect($uri, $is_external) {
$uri_object = new PhutilURI($uri);
if ($is_external) {
// If this is a remote resource it must have a domain set. This
// would also be caught below, but testing for it explicitly first allows
// us to raise a better error message.
if (!strlen($uri_object->getDomain())) {
throw new Exception(
pht(
'Refusing to redirect to external URI "%s". This URI '.
'is not fully qualified, and is missing a domain name. To '.
'redirect to a local resource, remove the external flag.',
(string)$uri));
}
// Check that it's a valid remote resource.
if (!PhabricatorEnv::isValidRemoteWebResource($uri)) {
throw new Exception(
pht(
'Refusing to redirect to external URI "%s". This URI '.
'is not a valid remote web resource.',
(string)$uri));
}
} else {
// If this is a local resource, it must not have a domain set. This allows
// us to raise a better error message than the check below can.
if (strlen($uri_object->getDomain())) {
throw new Exception(
pht(
'Refusing to redirect to local resource "%s". The URI has a '.
'domain, but the redirect is not marked external. Mark '.
'redirects as external to allow redirection off the local '.
'domain.',
(string)$uri));
}
// If this is a local resource, it must be a valid local resource.
if (!PhabricatorEnv::isValidLocalWebResource($uri)) {
throw new Exception(
pht(
'Refusing to redirect to local resource "%s". This URI is not '.
'formatted in a recognizable way.',
(string)$uri));
}
// Fully qualify the result URI.
$uri = PhabricatorEnv::getURI((string)$uri);
}
return (string)$uri;
}
}

63
src/aphront/response/__tests__/AphrontRedirectResponseTestCase.php Normal file
View file

@ -0,0 +1,63 @@
<?php
final class AphrontRedirectResponseTestCase extends PhabricatorTestCase {
public function testLocalRedirectURIs() {
// Format a bunch of URIs for local and remote redirection, making sure
// we get the expected results.
$uris = array(
'/a' => array(
'http://phabricator.example.com/a',
false,
),
'a' => array(
false,
false,
),
'/\\evil.com' => array(
false,
false,
),
'http://www.evil.com/' => array(
false,
'http://www.evil.com/',
),
'//evil.com' => array(
false,
false,
),
'//' => array(
false,
false,
),
'' => array(
false,
false,
),
);
foreach ($uris as $input => $cases) {
foreach (array(false, true) as $idx => $is_external) {
$expect = $cases[$idx];
$caught = null;
try {
$result = AphrontRedirectResponse::getURIForRedirect(
$input,
$is_external);
} catch (Exception $ex) {
$caught = $ex;
}
if ($expect === false) {
$this->assertTrue(($caught instanceof Exception), $input);
} else {
$this->assertEqual(null, $caught, $input);
$this->assertEqual($expect, $result, $input);
}
}
}
}
}

4
src/applications/auth/provider/PhabricatorOAuth1AuthProvider.php
View file

@ -62,7 +62,9 @@ abstract class PhabricatorOAuth1AuthProvider
$client_code,
$adapter->getTokenSecret());
$response = id(new AphrontRedirectResponse())->setURI($uri);
$response = id(new AphrontRedirectResponse())
->setIsExternal(true)
->setURI($uri);
return array($account, $response);
}

6
src/applications/files/controller/PhabricatorFileDataController.php
View file

@ -74,6 +74,7 @@ final class PhabricatorFileDataController extends PhabricatorFileController {
// if the user can see the file, generate a token;
// redirect to the alt domain with the token;
return id(new AphrontRedirectResponse())
->setIsExternal(true)
->setURI($file->getCDNURIWithToken());
} else {
@ -128,7 +129,9 @@ final class PhabricatorFileDataController extends PhabricatorFileController {
// file cannot be served via cdn, and no token given
// redirect to the main domain to aquire a token
// This is marked as an "external" URI because it is fully qualified.
return id(new AphrontRedirectResponse())
->setIsExternal(true)
->setURI($acquire_token_uri);
}
}
@ -171,7 +174,10 @@ final class PhabricatorFileDataController extends PhabricatorFileController {
// authenticate users on the file domain. This should blunt any
// attacks based on iframes, script tags, applet tags, etc., at least.
// Send the user to the "info" page if they're using some other method.
// This is marked as "external" because it is fully qualified.
return id(new AphrontRedirectResponse())
->setIsExternal(true)
->setURI(PhabricatorEnv::getProductionURI($file->getBestURI()));
}
$response->setMimeType($file->getMimeType());

4
src/applications/phortune/provider/PhortunePaypalPaymentProvider.php
View file

@ -116,7 +116,9 @@ final class PhortunePaypalPaymentProvider extends PhortunePaymentProvider {
'token' => $result['TOKEN'],
));
return id(new AphrontRedirectResponse())->setURI($uri);
return id(new AphrontRedirectResponse())
->setIsExternal(true)
->setURI($uri);
case 'charge':
var_dump($_REQUEST);
break;

8
src/applications/phortune/provider/PhortuneWePayPaymentProvider.php
View file

@ -149,7 +149,9 @@ final class PhortuneWePayPaymentProvider extends PhortunePaymentProvider {
// user might not end up back here. Really this needs a bunch of junk.
$uri = new PhutilURI($result->checkout_uri);
return id(new AphrontRedirectResponse())->setURI($uri);
return id(new AphrontRedirectResponse())
->setIsExternal(true)
->setURI($uri);
case 'charge':
$checkout_id = $request->getInt('checkout_id');
$params = array(
@ -195,7 +197,9 @@ final class PhortuneWePayPaymentProvider extends PhortunePaymentProvider {
unset($unguarded);
return id(new AphrontRedirectResponse())->setURI($cart_uri);
return id(new AphrontRedirectResponse())
->setIsExternal(true)
->setURI($cart_uri);
case 'cancel':
var_dump($_REQUEST);
break;

15
src/infrastructure/env/PhabricatorEnv.php vendored
View file

@ -462,6 +462,21 @@ final class PhabricatorEnv {
return false;
}
// Chrome (at a minimum) interprets backslashes in Location headers and the
// URL bar as forward slashes. This is probably intended to reduce user
// error caused by confusion over which key is "forward slash" vs "back
// slash".
//
// However, it means a URI like "/\evil.com" is interpreted like
// "//evil.com", which is a protocol relative remote URI.
//
// Since we currently never generate URIs with backslashes in them, reject
// these unconditionally rather than trying to figure out how browsers will
// interpret them.
if (preg_match('/\\\\/', $uri)) {
return false;
}
// Valid URIs must begin with '/', followed by the end of the string or some
// other non-'/' character. This rejects protocol-relative URIs like
// "//evil.com/evil_stuff/".

1
src/infrastructure/env/__tests__/PhabricatorEnvTestCase.php vendored
View file

@ -13,6 +13,7 @@ final class PhabricatorEnvTestCase extends PhabricatorTestCase {
'javascript:lol' => false,
'' => false,
null => false,
'/\\evil.com' => false,
);
foreach ($map as $uri => $expect) {

4
src/infrastructure/testing/PhabricatorTestCase.php
View file

@ -118,6 +118,10 @@ abstract class PhabricatorTestCase extends ArcanistPhutilTestCase {
// TODO: Remove this when we remove "releeph.installed".
$this->env->overrideEnvConfig('releeph.installed', true);
$this->env->overrideEnvConfig(
'phabricator.base-uri',
'http://phabricator.example.com');
}
protected function didRunTests() {