127 lines
4.5 KiB
PHP
127 lines
4.5 KiB
PHP
<?php
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if ( ! class_exists( 'Jetpack_Protect_Math_Authenticate' ) ) {
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/*
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* The math captcha fallback if we can't talk to the Protect API
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*/
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class Jetpack_Protect_Math_Authenticate {
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static $loaded;
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function __construct() {
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if ( self::$loaded ) {
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return;
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}
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self::$loaded = 1;
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add_action( 'login_form', array( $this, 'math_form' ) );
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if( isset( $_POST[ 'jetpack_protect_process_math_form' ] ) ) {
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add_action( 'init', array( $this, 'process_generate_math_page' ) );
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}
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}
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/**
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* Verifies that a user answered the math problem correctly while logging in.
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*
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* @return bool Returns true if the math is correct
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* @throws Error if insuffient $_POST variables are present.
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* @throws Error message if the math is wrong
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*/
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static function math_authenticate() {
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$salt = get_site_option( 'jetpack_protect_key' ) . get_site_option( 'admin_email' );
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$ans = isset( $_POST['jetpack_protect_num'] ) ? (int) $_POST['jetpack_protect_num'] : '' ;
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$salted_ans = sha1( $salt . $ans );
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$correct_ans = isset( $_POST[ 'jetpack_protect_answer' ] ) ? $_POST[ 'jetpack_protect_answer' ] : '' ;
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if( isset( $_COOKIE[ 'jpp_math_pass' ] ) ) {
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$transient = Jetpack_Protect_Module::get_transient( 'jpp_math_pass_' . $_COOKIE[ 'jpp_math_pass' ] );
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if( !$transient || $transient < 1 ) {
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Jetpack_Protect_Math_Authenticate::generate_math_page();
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}
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return true;
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}
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if ( ! $correct_ans || !$_POST['jetpack_protect_num'] ) {
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Jetpack_Protect_Math_Authenticate::generate_math_page();
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} elseif ( $salted_ans != $correct_ans ) {
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wp_die(
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__( '<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' ),
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'',
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401
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);
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} else {
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return true;
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}
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}
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/**
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* Creates an interim page to collect answers to a math captcha
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*
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* @return none, execution stopped
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*/
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static function generate_math_page( $error = false ) {
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$salt = get_site_option( 'jetpack_protect_key' ) . get_site_option( 'admin_email' );
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$num1 = rand( 0, 10 );
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$num2 = rand( 1, 10 );
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$sum = $num1 + $num2;
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$ans = sha1( $salt . $sum );
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ob_start();
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?>
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<h2><?php _e( 'Please solve this math problem to prove that you are not a bot. Once you solve it, you will need to log in again.', 'jetpack' ); ?></h2>
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<?php if ($error): ?>
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<h3><?php _e( 'Your answer was incorrect, please try again.', 'jetpack' ); ?></h3>
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<?php endif ?>
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<form action="<?php echo wp_login_url(); ?>" method="post" accept-charset="utf-8">
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<?php Jetpack_Protect_Math_Authenticate::math_form(); ?>
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<input type="hidden" name="jetpack_protect_process_math_form" value="1" id="jetpack_protect_process_math_form" />
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<p><input type="submit" value="<?php esc_html_e( 'Continue →', 'jetpack' ); ?>"></p>
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</form>
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<?php
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$mathage = ob_get_contents();
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ob_end_clean();
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wp_die( $mathage );
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}
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public function process_generate_math_page() {
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$salt = get_site_option( 'jetpack_protect_key' ) . get_site_option( 'admin_email' );
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$ans = (int)$_POST['jetpack_protect_num'];
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$salted_ans = sha1( $salt . $ans );
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$correct_ans = $_POST[ 'jetpack_protect_answer' ];
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if ( $salted_ans != $correct_ans ) {
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Jetpack_Protect_Math_Authenticate::generate_math_page(true);
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} else {
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$temp_pass = substr( sha1( rand( 1, 100000000 ) . get_site_option( 'jetpack_protect_key' ) ), 5, 25 );
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Jetpack_Protect_Module::set_transient( 'jpp_math_pass_' . $temp_pass, 3, DAY_IN_SECONDS );
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setcookie('jpp_math_pass', $temp_pass, time() + DAY_IN_SECONDS, COOKIEPATH, COOKIE_DOMAIN, false);
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return true;
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}
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}
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/**
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* Requires a user to solve a simple equation. Added to any WordPress login form.
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*
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* @return VOID outputs html
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*/
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static function math_form() {
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$salt = get_site_option( 'jetpack_protect_key' ) . get_site_option( 'admin_email' );
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$num1 = rand( 0, 10 );
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$num2 = rand( 1, 10 );
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$sum = $num1 + $num2;
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$ans = sha1( $salt . $sum );
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?>
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<div style="margin: 5px 0 20px;">
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<strong><?php esc_html_e( 'Prove your humanity:', 'jetpack' ); ?> </strong>
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<?php echo $num1 ?> + <?php echo $num2 ?> =
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<input type="input" name="jetpack_protect_num" value="" size="2" />
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<input type="hidden" name="jetpack_protect_answer" value="<?php echo $ans; ?>" />
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</div>
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<?php
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}
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}
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}
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