jetpack / modules / protect / math-fallback.php

math-fallback.php in Jetpack – WP Security, Backup, Speed, & Growth 5.0.3, at modules/protect/math-fallback.php

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1	<?php
2
3	if ( ! class_exists( 'Jetpack_Protect_Math_Authenticate' ) ) {
4	/*
5	* The math captcha fallback if we can't talk to the Protect API
6	*/
7	class Jetpack_Protect_Math_Authenticate {
8
9	static $loaded;
10
11	function __construct() {
12
13	if ( self::$loaded ) {
14	return;
15	}
16
17	self::$loaded = 1;
18
19	add_action( 'login_form', array( $this, 'math_form' ) );
20
21	if( isset( $_POST[ 'jetpack_protect_process_math_form' ] ) ) {
22	add_action( 'init', array( $this, 'process_generate_math_page' ) );
23	}
24	}
25
26	/**
27	* Verifies that a user answered the math problem correctly while logging in.
28	*
29	* @return bool Returns true if the math is correct
30	* @throws Error if insuffient $_POST variables are present.
31	* @throws Error message if the math is wrong
32	*/
33	static function math_authenticate() {
34	$salt = get_site_option( 'jetpack_protect_key' ) . get_site_option( 'admin_email' );
35	$ans = isset( $_POST['jetpack_protect_num'] ) ? (int) $_POST['jetpack_protect_num'] : '' ;
36	$salted_ans = sha1( $salt . $ans );
37	$correct_ans = isset( $_POST[ 'jetpack_protect_answer' ] ) ? $_POST[ 'jetpack_protect_answer' ] : '' ;
38
39	if( isset( $_COOKIE[ 'jpp_math_pass' ] ) ) {
40	$transient = Jetpack_Protect_Module::get_transient( 'jpp_math_pass_' . $_COOKIE[ 'jpp_math_pass' ] );
41	if( !$transient \|\| $transient < 1 ) {
42	Jetpack_Protect_Math_Authenticate::generate_math_page();
43	}
44	return true;
45	}
46
47	if ( ! $correct_ans \|\| !$_POST['jetpack_protect_num'] ) {
48	Jetpack_Protect_Math_Authenticate::generate_math_page();
49	} elseif ( $salted_ans != $correct_ans ) {
50	wp_die(
51	__( '<strong>You failed to correctly answer the math problem.</strong> This is used to combat spam when the Protect API is unavailable. Please use your browser\'s back button to return to the login form, press the "refresh" button to generate a new math problem, and try to log in again.', 'jetpack' ),
52	'',
53	401
54	);
55	} else {
56	return true;
57	}
58	}
59
60	/**
61	* Creates an interim page to collect answers to a math captcha
62	*
63	* @return none, execution stopped
64	*/
65	static function generate_math_page( $error = false ) {
66	$salt = get_site_option( 'jetpack_protect_key' ) . get_site_option( 'admin_email' );
67	$num1 = rand( 0, 10 );
68	$num2 = rand( 1, 10 );
69	$sum = $num1 + $num2;
70	$ans = sha1( $salt . $sum );
71	ob_start();
72	?>
73	<h2><?php _e( 'Please solve this math problem to prove that you are not a bot. Once you solve it, you will need to log in again.', 'jetpack' ); ?></h2>
74	<?php if ($error): ?>
75	<h3><?php _e( 'Your answer was incorrect, please try again.', 'jetpack' ); ?></h3>
76	<?php endif ?>
77
78	<form action="<?php echo wp_login_url(); ?>" method="post" accept-charset="utf-8">
79	<?php Jetpack_Protect_Math_Authenticate::math_form(); ?>
80	<input type="hidden" name="jetpack_protect_process_math_form" value="1" id="jetpack_protect_process_math_form" />
81	<p><input type="submit" value="<?php esc_html_e( 'Continue →', 'jetpack' ); ?>"></p>
82	</form>
83	<?php
84	$mathpage = ob_get_contents();
85	ob_end_clean();
86	wp_die(
87	$mathpage,
88	'',
89	'401'
90	);
91	}
92
93	public function process_generate_math_page() {
94	$salt = get_site_option( 'jetpack_protect_key' ) . get_site_option( 'admin_email' );
95	$ans = (int)$_POST['jetpack_protect_num'];
96	$salted_ans = sha1( $salt . $ans );
97	$correct_ans = $_POST[ 'jetpack_protect_answer' ];
98
99	if ( $salted_ans != $correct_ans ) {
100	Jetpack_Protect_Math_Authenticate::generate_math_page(true);
101	} else {
102	$temp_pass = substr( sha1( rand( 1, 100000000 ) . get_site_option( 'jetpack_protect_key' ) ), 5, 25 );
103	Jetpack_Protect_Module::set_transient( 'jpp_math_pass_' . $temp_pass, 3, DAY_IN_SECONDS );
104	setcookie('jpp_math_pass', $temp_pass, time() + DAY_IN_SECONDS, COOKIEPATH, COOKIE_DOMAIN, false);
105	return true;
106	}
107	}
108
109	/**
110	* Requires a user to solve a simple equation. Added to any WordPress login form.
111	*
112	* @return VOID outputs html
113	*/
114	static function math_form() {
115	$salt = get_site_option( 'jetpack_protect_key' ) . get_site_option( 'admin_email' );
116	$num1 = rand( 0, 10 );
117	$num2 = rand( 1, 10 );
118	$sum = $num1 + $num2;
119	$ans = sha1( $salt . $sum );
120	?>
121	<div style="margin: 5px 0 20px;">
122	<strong><?php esc_html_e( 'Prove your humanity:', 'jetpack' ); ?> </strong>
123	<?php echo $num1 ?>   +   <?php echo $num2 ?>   =
124	<input type="input" name="jetpack_protect_num" value="" size="2" />
125	<input type="hidden" name="jetpack_protect_answer" value="<?php echo $ans; ?>" />
126	</div>
127	<?php
128	}
129
130	}
131	}
132