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1 | <?php |
2 | /** |
3 | * This program is free software; you can redistribute it and/or modify |
4 | * it under the terms of the GNU General Public License as published by |
5 | * the Free Software Foundation; either version 2 of the License, or |
6 | * (at your option) any later version. |
7 | * |
8 | * This program is distributed in the hope that it will be useful, |
9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
11 | * GNU General Public License for more details. |
12 | * |
13 | * You should have received a copy of the GNU General Public License along |
14 | * with this program; if not, write to the Free Software Foundation, Inc., |
15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. |
16 | * http://www.gnu.org/copyleft/gpl.html |
17 | * |
18 | * @file |
19 | */ |
20 | |
21 | namespace MediaWiki\Session; |
22 | |
23 | use MediaWiki\Request\WebRequest; |
24 | use MediaWiki\User\LoggedOutEditToken; |
25 | |
26 | /** |
27 | * Stores and matches CSRF tokens belonging to a given session user. |
28 | * @since 1.37 |
29 | * @package MediaWiki\Session |
30 | */ |
31 | class CsrfTokenSet { |
32 | |
33 | /** |
34 | * @var string default name for the form field to place the token in. |
35 | */ |
36 | public const DEFAULT_FIELD_NAME = 'wpEditToken'; |
37 | |
38 | private WebRequest $request; |
39 | |
40 | /** |
41 | * @param WebRequest $request |
42 | */ |
43 | public function __construct( WebRequest $request ) { |
44 | $this->request = $request; |
45 | } |
46 | |
47 | /** |
48 | * Initialize (if necessary) and return a current user CSRF token |
49 | * value which can be used in edit forms to show that the user's |
50 | * login credentials aren't being hijacked with a foreign form |
51 | * submission. |
52 | * |
53 | * The $salt for 'edit' and 'csrf' tokens is the default (empty string). |
54 | * |
55 | * @param string|string[] $salt Optional function-specific data for hashing |
56 | * @return Token |
57 | * @since 1.37 |
58 | */ |
59 | public function getToken( $salt = '' ): Token { |
60 | $session = $this->request->getSession(); |
61 | if ( !$session->getUser()->isRegistered() ) { |
62 | return new LoggedOutEditToken(); |
63 | } |
64 | return $session->getToken( $salt ); |
65 | } |
66 | |
67 | /** |
68 | * Check if a request contains a value named $valueName with the token value |
69 | * stored in the session. |
70 | * |
71 | * @param string $fieldName |
72 | * @param string|string[] $salt |
73 | * @return bool |
74 | * @since 1.37 |
75 | * @see self::matchCSRFToken |
76 | */ |
77 | public function matchTokenField( |
78 | string $fieldName = self::DEFAULT_FIELD_NAME, |
79 | $salt = '' |
80 | ): bool { |
81 | return $this->matchToken( $this->request->getVal( $fieldName ), $salt ); |
82 | } |
83 | |
84 | /** |
85 | * Check if a value matches with the token value stored in the session. |
86 | * A match should confirm that the form was submitted from the user's own |
87 | * login session, not a form submission from a third-party site. |
88 | * |
89 | * @param string|null $value |
90 | * @param string|string[] $salt |
91 | * @return bool |
92 | * @since 1.37 |
93 | */ |
94 | public function matchToken( |
95 | ?string $value, |
96 | $salt = '' |
97 | ): bool { |
98 | if ( !$value ) { |
99 | return false; |
100 | } |
101 | $session = $this->request->getSession(); |
102 | // It's expensive to generate a new registered user token, so take a shortcut. |
103 | // Anon tokens are cheap and all the same, so we can afford to generate one just to match. |
104 | if ( $session->getUser()->isRegistered() && !$session->hasToken() ) { |
105 | return false; |
106 | } |
107 | return $this->getToken( $salt )->match( $value ); |
108 | } |
109 | } |