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XMLRPC: Prevent authentication from occuring after a failed authentication attmept in any single XML-RPC call. 

This hardens WordPress against a common vector which uses multiple user identifiers in a single `system.multicall` call. In the event that authentication fails, all following authentication attempts ''in that call'' will also fail.

Props dd32, johnbillion.
Fixes #34336


git-svn-id: https://develop.svn.wordpress.org/trunk@35366 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
Dion Hulse 2015-10-23 04:45:10 +00:00
parent 3a992e266f
commit 75ab50c70e
3 changed files with 98 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
src/wp-includes/class-wp-xmlrpc-server.php
View File

@ -45,6 +45,14 @@ class wp_xmlrpc_server extends IXR_Server {
*/
public $error;
/**
* Flags that the user authentication has failed in this instance of wp_xmlrpc_server.
*
* @access protected
* @var bool
*/
protected $auth_failed = false;
/**
* Register all of the XMLRPC methods that XMLRPC server understands.
*
@ -251,11 +259,18 @@ class wp_xmlrpc_server extends IXR_Server {
return false;
}
$user = wp_authenticate($username, $password);
if ( $this->auth_failed ) {
$user = new WP_Error( 'login_prevented' );
} else {
$user = wp_authenticate( $username, $password );
}
if (is_wp_error($user)) {
if ( is_wp_error( $user ) ) {
$this->error = new IXR_Error( 403, __( 'Incorrect username or password.' ) );
// Flag that authentication has failed once on this wp_xmlrpc_server instance
$this->auth_failed = true;
/**
* Filter the XML-RPC user login error message.
*

11
tests/phpunit/includes/testcase-xmlrpc.php
View File

@ -11,11 +11,14 @@ class WP_XMLRPC_UnitTestCase extends WP_UnitTestCase {
add_filter( 'pre_option_enable_xmlrpc', '__return_true' );
$this->myxmlrpcserver = new wp_xmlrpc_server();
$this->myxmlrpcserver = new WP_XMLRPC_Server_UnitTestable();
}
function tearDown() {
remove_filter( 'pre_option_enable_xmlrpc', '__return_true' );
$this->myxmlrpcserver->reset_failed_auth();
$this->remove_added_uploads();
parent::tearDown();
@ -29,3 +32,9 @@ class WP_XMLRPC_UnitTestCase extends WP_UnitTestCase {
));
}
}
class WP_XMLRPC_Server_UnitTestable extends wp_xmlrpc_server {
public function reset_failed_auth() {
$this->auth_failed = false;
}
}

74
tests/phpunit/tests/xmlrpc/basic.php
View File

@ -19,10 +19,78 @@ class Tests_XMLRPC_Basic extends WP_XMLRPC_UnitTestCase {
function test_login_pass_ok() {
$user_id = $this->make_user_by_role( 'subscriber' );
$this->assertFalse( $this->myxmlrpcserver->login_pass_ok( 'username', 'password' ) );
$this->assertFalse( $this->myxmlrpcserver->login( 'username', 'password' ) );
$this->assertTrue( $this->myxmlrpcserver->login_pass_ok( 'subscriber', 'subscriber' ) );
$this->assertInstanceOf( 'WP_User', $this->myxmlrpcserver->login( 'subscriber', 'subscriber' ) );
}
function test_login_pass_bad() {
$user_id = $this->make_user_by_role( 'subscriber' );
$this->assertFalse( $this->myxmlrpcserver->login_pass_ok( 'username', 'password' ) );
$this->assertFalse( $this->myxmlrpcserver->login( 'username', 'password' ) );
// The auth will still fail due to authentication blocking after the first failed attempt
$this->assertFalse( $this->myxmlrpcserver->login_pass_ok( 'subscriber', 'subscriber' ) );
}
/**
* @ticket 34336
*/
function test_multicall_invalidates_all_calls_after_invalid_call() {
$editor_id = $this->make_user_by_role( 'editor' );
$post_id = self::factory()->post->create( array(
'post_author' => $editor_id,
) );
$method_calls = array(
// Valid login
array(
'methodName' => 'wp.editPost',
'params' => array(
0,
'editor',
'editor',
$post_id,
array(
'title' => 'Title 1',
),
),
),
// *Invalid* login
array(
'methodName' => 'wp.editPost',
'params' => array(
0,
'editor',
'password',
$post_id,
array(
'title' => 'Title 2',
),
),
),
// Valid login
array(
'methodName' => 'wp.editPost',
'params' => array(
0,
'editor',
'editor',
$post_id,
array(
'title' => 'Title 3',
),
),
),
);
$this->myxmlrpcserver->callbacks = $this->myxmlrpcserver->methods;
$result = $this->myxmlrpcserver->multiCall( $method_calls );
$this->assertArrayNotHasKey( 'faultCode', $result[0] );
$this->assertArrayHasKey( 'faultCode', $result[1] );
$this->assertArrayHasKey( 'faultCode', $result[2] );
}
}