File "wp-security-captcha.php"
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<?php
if (!defined('ABSPATH')) die('No direct access.');
class AIOWPSecurity_Captcha {
private $cloudflare_verify_turnstile_url = 'https://challenges.cloudflare.com/turnstile/v0/siteverify';
private $google_verify_recaptcha_url = 'https://www.google.com/recaptcha/api/siteverify';
/**
* Constructor for the AIOWPSecurity_Captcha class.
*
* Initializes and sets up actions and filters related to AIOWPS Captcha features.
*/
public function __construct() {
global $aio_wp_security;
$this->upgrade_captcha_options();
add_action('login_enqueue_scripts', array($this, 'aiowps_login_enqueue'));
add_filter('script_loader_tag', array($this, 'add_cfasync_data_attribute_to_captcha_tag'), 10, 2);
if (AIOWPSecurity_Utility::is_contact_form_7_plugin_active() && '1' == $aio_wp_security->configs->get_value('aiowps_enable_contact_form_7_captcha')) {
add_action('wpcf7_admin_init', array($this, 'add_contact_form_7_captcha_tag_generator_button'), 100, 0);
add_filter('wpcf7_contact_form_properties', array($this, 'add_contact_form_7_captcha'));
add_filter('wpcf7_validate', array($this, 'verify_contact_form_7_captcha'), 10, 2);
}
}
/**
* This method modifies the script tag output by adding 'data-cfasync="false"' attribute,
* which is used to disable Cloudflare Rocket Loader for the specified captcha script handle.
*
* @param string $tag - The generated HTML tag for the script.
* @param string $handle - The script handle being processed.
*
* @return string The modified HTML tag with 'data-cfasync="false"' if applicable.
*/
public function add_cfasync_data_attribute_to_captcha_tag($tag, $handle) {
global $aio_wp_security;
// Get the default captcha from AIO WP Security configurations
$default_captcha = $aio_wp_security->configs->get_value('aiowps_default_captcha');
// Check if the current script handle matches the default captcha handle
if ($default_captcha === $handle) {
if (!preg_match('/\sdata-cfasync\s*=\s*["\']false["\']/', $tag)) {
// Add 'data-cfasync="false"' attribute to the script tag
$tag = str_replace('src=', 'data-cfasync="false" src=', $tag);
}
}
// Return the modified or original script tag
return $tag;
}
/**
* This function handles upgrading captcha options
*
* @return void
*/
private function upgrade_captcha_options() {
global $aio_wp_security;
if (!empty($aio_wp_security->configs->get_value('aiowps_default_captcha'))) return;
// Upgrade the default captcha option
if ($aio_wp_security->configs->get_value('aiowps_default_recaptcha')) {
$aio_wp_security->configs->set_value('aiowps_default_recaptcha', '');
$aio_wp_security->configs->set_value('aiowps_default_captcha', 'google-recaptcha-v2');
} elseif ('1' == $aio_wp_security->configs->get_value('aiowps_enable_login_captcha') || '1' == $aio_wp_security->configs->get_value('aiowps_enable_registration_page_captcha')) {
$aio_wp_security->configs->set_value('aiowps_default_captcha', 'simple-math');
} else {
$aio_wp_security->configs->set_value('aiowps_default_captcha', 'none');
}
}
/**
* This function will return an array of supported CAPTCHA options
*
* @return array - an array of supported CAPTCHA options
*/
public function get_supported_captchas() {
return array(
'none' => 'No CAPTCHA',
'cloudflare-turnstile' => 'Cloudflare Turnstile',
'google-recaptcha-v2' => 'Google reCAPTCHA V2',
'simple-math' => 'Simple math CAPTCHA'
);
}
/**
* This function will return an array of supported CAPTCHA themes
*
* @return array - an array of supported CAPTCHA themes
*/
public function get_captcha_themes() {
return array(
'auto' => __('Auto', 'all-in-one-wp-security-and-firewall'),
'light' => __('Light', 'all-in-one-wp-security-and-firewall'),
'dark' => __('Dark', 'all-in-one-wp-security-and-firewall'),
);
}
/**
* Enqueues the CAPTCHA script for the default CAPTCHA on the standard WP login page
*
* @return void
*/
public function aiowps_login_enqueue() {
global $aio_wp_security;
if ($aio_wp_security->is_login_lockdown_by_const()) return;
if ('1' != $aio_wp_security->configs->get_value('aiowps_enable_login_captcha') && '1' != $aio_wp_security->configs->get_value('aiowps_enable_registration_page_captcha')) return;
$default_captcha = $aio_wp_security->configs->get_value('aiowps_default_captcha');
switch ($default_captcha) {
case 'cloudflare-turnstile':
case 'google-recaptcha-v2':
wp_enqueue_script($default_captcha, $this->get_captcha_script_url($default_captcha), array(), AIO_WP_SECURITY_VERSION, false);
// Below is needed to provide some space for the CAPTCHA form (otherwise it appears partially hidden on RHS)
wp_add_inline_style('login', "#login { width: 340px; }");
break;
default:
break;
}
}
/**
* If the user is not on the WooCommerce account page, enqueue the CAPTCHA script in the wp_head for general pages
* Caters for scenarios when CAPTCHA is used on wp comments or custom wp login form pages
*
* @return void
*/
public function add_captcha_script() {
global $aio_wp_security;
// Do NOT enqueue if this is the main WooCommerce account login page because for WooCommerce page we "explicitly" render the reCAPTCHA widget
$is_woo = false;
// We don't want to load for Woo account page because we have a special function for this
if (function_exists('is_account_page')) $is_woo = is_account_page();
if (!empty($is_woo)) return;
$default_captcha = $aio_wp_security->configs->get_value('aiowps_default_captcha');
switch ($default_captcha) {
case 'cloudflare-turnstile':
case 'google-recaptcha-v2':
wp_enqueue_script($default_captcha, $this->get_captcha_script_url($default_captcha), array(), AIO_WP_SECURITY_VERSION, false);
break;
default:
break;
}
}
/**
* Renders CAPTCHA on form produced by the wp_login_form() function, ie, custom wp login form
*
* @param string $cust_html_code
*
* @return string
*/
public function insert_captcha_custom_login($cust_html_code) {
global $aio_wp_security;
if ($aio_wp_security->is_login_lockdown_by_const()) return '';
$default_captcha = $aio_wp_security->configs->get_value('aiowps_default_captcha');
switch ($default_captcha) {
case 'cloudflare-turnstile':
case 'google-recaptcha-v2':
$cust_html_code .= $this->get_captcha_form($default_captcha, 0, true);
return $cust_html_code;
break;
case 'simple-math':
$maths_captcha_input_id = uniqid('aiowps-captcha-answer-'); // Generate a unique DOM-safe ID for the maths captcha input field to avoid duplicate IDs (when multiple forms appear on the same page).
$cap_form = '<p class="aiowps-captcha"><label for="' . esc_attr($maths_captcha_input_id) . '">'.esc_html__('Please enter an answer in digits:', 'all-in-one-wp-security-and-firewall').'</label>';
$cap_form .= '<div class="aiowps-captcha-equation"><strong>';
$maths_question_output = $aio_wp_security->captcha_obj->generate_maths_question($maths_captcha_input_id);
$cap_form .= $maths_question_output . '</strong></div></p>';
$cust_html_code .= $cap_form;
return $cust_html_code;
break;
default:
return '';
break;
}
}
/**
* Inserts captcha into the password-protected page form.
*
* @param string $cust_html_code The HTML code for the password form.
* @return string The modified HTML code with the captcha inserted.
*/
public function insert_captcha_password_protected($cust_html_code) {
global $post, $aio_wp_security;
$loginurl = esc_url(site_url('/wp-login.php?action=postpass'));
$label = 'pwbox-' . empty($post->ID) ? wp_rand() : $post->ID;
$default_captcha = $aio_wp_security->configs->get_value('aiowps_default_captcha');
$cust_html_code = '<div class="container-custom">
<form action="'.esc_attr($loginurl).'" method="post">
<label>'.esc_html__('This content is password protected.', 'all-in-one-wp-security-and-firewall').' '.esc_html__('To view it please enter your password below:', 'all-in-one-wp-security-and-firewall').'</label>
<label for="'.esc_attr($label).'">'.esc_html__('Password:', 'all-in-one-wp-security-and-firewall').'</label>
<input name="post_password" id="'.esc_attr($label).'" type="password" size="20" />';
switch ($default_captcha) {
case 'cloudflare-turnstile':
case 'google-recaptcha-v2':
$cust_html_code .= $this->get_captcha_form($default_captcha, 0, true);
$this->add_captcha_script();
break;
case 'simple-math':
$maths_captcha_input_id = uniqid('aiowps-captcha-answer-'); // Generate a unique DOM-safe ID for the maths captcha input field to avoid duplicate IDs (when multiple forms appear on the same page).
$captcha_form = '<p class="aiowps-captcha"><label for="' . esc_attr($maths_captcha_input_id) . '">'.esc_html__('Please enter an answer in digits:', 'all-in-one-wp-security-and-firewall').'</label>';
$captcha_form .= '<div class="aiowps-captcha-equation"><strong>';
$maths_question_output = $aio_wp_security->captcha_obj->generate_maths_question($maths_captcha_input_id);
$captcha_form .= $maths_question_output . '</strong></div></p>';
$cust_html_code .= $captcha_form;
break;
default:
break;
}
$cust_html_code .= '<input type="submit" name="Submit" class="button" value="'.esc_html__('Enter', 'all-in-one-wp-security-and-firewall').'" />
</form>
</div>';
return $cust_html_code;
}
/**
* Validates the password form on password protected pages with captcha.
*
* @return void
*/
public function validate_password_protected_password_form_with_captcha() {
// Check password protected page captcha
$verify = $this->verify_captcha_submit();
if (!$verify) {
wp_die(esc_html__('Captcha verification failed.', 'all-in-one-wp-security-and-firewall'). ' ' . esc_html__('Please try again.', 'all-in-one-wp-security-and-firewall'));
}
}
/**
* Insert CAPTCHA question form on WooCommerce my account page forms or other forms.
*
* This function determines the type of CAPTCHA to display based on the configured default CAPTCHA type.
* It handles special cases for WooCommerce "my account" page where both login and register forms need
* CAPTCHAs rendered explicitly. For other forms, it renders CAPTCHA normally.
*
* @global object $aio_wp_security The global instance of the aio_wp_security class, which holds configuration settings.
*
* @return void
*/
public function insert_captcha_question_form() {
global $aio_wp_security;
$default_captcha = $aio_wp_security->configs->get_value('aiowps_default_captcha');
switch ($default_captcha) {
case 'cloudflare-turnstile':
case 'google-recaptcha-v2':
// WooCommerce "my account" page needs special consideration, ie,
// need to display two CAPTCHA forms on same page (for login and register forms)
// For this case we use the "explicit" CAPTCHA display
$calling_hook = current_filter();
if ('woocommerce_login_form' == $calling_hook || 'woocommerce_lostpassword_form' == $calling_hook || 'woocommerce_after_checkout_billing_form' == $calling_hook) {
$this->get_captcha_form($default_captcha, 1);
return;
}
if ('woocommerce_register_form' == $calling_hook) {
$this->get_captcha_form($default_captcha, 1);
return;
}
// For all other forms simply display CAPTCHA as normal
$this->display_captcha_form($default_captcha);
break;
case 'simple-math':
// Display plain maths CAPTCHA form
$this->display_captcha_form($default_captcha);
break;
default:
break;
}
}
/**
* For WooCommerce my account page - display two separate CAPTCHA forms "explicitly"
*
* @return void
*/
public function print_captcha_api_woo() {
global $aio_wp_security;
//captcha should only show for woo account and checkout page
if ((function_exists('is_account_page') && !is_account_page()) && (function_exists('is_checkout') && !is_checkout()) && !apply_filters('aios_print_captcha_api_woo', false)) return;
$default_captcha = $aio_wp_security->configs->get_value('aiowps_default_captcha');
if ('cloudflare-turnstile' == $default_captcha) :
$site_key = $aio_wp_security->configs->get_value('aiowps_turnstile_site_key');
// phpcs:ignore WordPress.WP.EnqueuedResources.NonEnqueuedScript -- Reason: This script is required inline for specific functionality
?>
<script src='https://challenges.cloudflare.com/turnstile/v0/api.js' async defer></script> <?php // phpcs:ignore WordPress.WP.EnqueuedResources.NonEnqueuedScript, PluginCheck.CodeAnalysis.Offloading.OffloadedContent -- Reason: This script is required inline for specific functionality
elseif ('google-recaptcha-v2' == $default_captcha) :
$site_key = $aio_wp_security->configs->get_value('aiowps_recaptcha_site_key');
$locale = $this->get_google_recaptcha_compatible_site_locale();
$script_url = 'https://www.google.com/recaptcha/api.js?hl='.esc_attr($locale).'&onload=onloadCallback&render=explicit';
?>
<script>
var verifyCallback = function(response) {
alert(response);
};
var onloadCallback = function() {
if (jQuery('.aios-wc-captcha').length) {
jQuery('.aios-wc-captcha').each(function(index, element) {
grecaptcha.render(element, {
'sitekey' : '<?php echo esc_js($site_key); ?>',
});
});
}
};
</script>
<script src='<?php echo esc_url($script_url); ?>' async defer></script> <?php // phpcs:ignore WordPress.WP.EnqueuedResources.NonEnqueuedScript -- Reason: This script is required inline for specific functionality
endif;
}
/**
* Displays CAPTCHA form
*
* @param string $default_captcha - the default CAPTCHA
* @param boolean $return_instead_of_echo - if we should return the form rather than echo it to page
*
* @return string|void
*/
public function display_captcha_form($default_captcha, $return_instead_of_echo = false) {
global $aio_wp_security;
if ($aio_wp_security->configs->get_value('aiowps_enable_bp_register_captcha') == '1' && defined('BP_VERSION')) {
//if buddy press feature active add action hook so buddy press can display our errors properly on bp registration form
do_action('bp_aiowps-captcha-answer_errors'); // phpcs:ignore WordPress.NamingConventions.PrefixAllGlobals.NonPrefixedHooknameFound -- we are hooking into buddypress here.
}
switch ($default_captcha) {
case 'cloudflare-turnstile':
if ('1' == $aio_wp_security->configs->get_value('aios_cloudflare_turnstile_invalid_configuration')) return;
if ($return_instead_of_echo) return $this->get_captcha_form($default_captcha, 0, $return_instead_of_echo);
$this->get_captcha_form($default_captcha);
break;
case 'google-recaptcha-v2':
if ('1' == $aio_wp_security->configs->get_value('aios_google_recaptcha_invalid_configuration')) return;
if ($return_instead_of_echo) return $this->get_captcha_form($default_captcha, 0, $return_instead_of_echo);
$this->get_captcha_form($default_captcha);
break;
case 'simple-math':
$maths_captcha_input_id = uniqid('aiowps-captcha-answer-'); // Generate a unique DOM-safe ID for the maths captcha input field to avoid duplicate IDs (when multiple forms appear on the same page).
$cap_form = '<p class="aiowps-captcha hide-when-displaying-tfa-input"><label for="' . esc_attr($maths_captcha_input_id) . '">'.esc_html__('Please enter an answer in digits:', 'all-in-one-wp-security-and-firewall').'</label>';
$cap_form .= '<div class="aiowps-captcha-equation hide-when-displaying-tfa-input"><strong>';
$cap_form .= $this->generate_maths_question($maths_captcha_input_id);
$cap_form .= '</strong></div></p>';
if ($return_instead_of_echo) return $cap_form;
echo $cap_form; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped -- Reason: already escaped
break;
}
}
/**
* It generates a random math problem, stores the answer in the database, and returns the math problem
*
* @param string $maths_captcha_input_id A unique identifier used for the captcha input field's ID attribute to prevent duplicate IDs in the DOM (e.g., when multiple forms exist on a page).
*
* @return string - contains the HTML for the captcha.
*/
private function generate_maths_question($maths_captcha_input_id) {
global $aio_wp_security;
//For now we will only do plus, minus, multiplication
$equation_string = '';
$operator_type = array('+', '−', '×');
$operand_display = array('word', 'number');
//let's now generate an equation
$operator = $operator_type[wp_rand(0, 2)];
if ('×' === $operator) {
//Don't make the question too hard if multiplication
$first_digit = wp_rand(1, 5);
$second_digit = wp_rand(1, 5);
} else {
$first_digit = wp_rand(1, 20);
$second_digit = wp_rand(1, 20);
}
if ('word' == $operand_display[wp_rand(0, 1)]) {
$first_operand = $this->number_word_mapping($first_digit);
} else {
$first_operand = $first_digit;
}
if ('word' == $operand_display[wp_rand(0, 1)]) {
$second_operand = $this->number_word_mapping($second_digit);
} else {
$second_operand = $second_digit;
}
//Let's calculate the result and construct the equation string
if ('+' === $operator) {
//Addition
$result = $first_digit+$second_digit;
$equation_string .= $first_operand . ' ' . $operator . ' ' . $second_operand . ' = ';
} elseif ('−' === $operator) {
//Subtraction
//If we are going to be negative let's swap operands around
if ($first_digit < $second_digit) {
$equation_string .= $second_operand . ' ' . $operator . ' ' . $first_operand . ' = ';
$result = $second_digit-$first_digit;
} else {
$equation_string .= $first_operand . ' ' . $operator . ' ' . $second_operand . ' = ';
$result = $first_digit-$second_digit;
}
} elseif ('×' === $operator) {
//Multiplication
$equation_string .= $first_operand . ' ' . $operator . ' ' . $second_operand . ' = ';
$result = $first_digit*$second_digit;
}
//Let's encode correct answer
$captcha_secret_string = $aio_wp_security->configs->get_value('aiowps_captcha_secret_key');
$current_time = time();
$enc_result = base64_encode($current_time.$captcha_secret_string.$result);
$random_str = AIOWPSecurity_Utility::generate_alpha_numeric_random_string(10);
if (is_multisite()) {
update_site_option('aiowps_captcha_string_info_'.$random_str, $enc_result);
update_site_option('aiowps_captcha_string_info_time_'.$random_str, $current_time);
} else {
update_option('aiowps_captcha_string_info_'.$random_str, $enc_result, false);
update_option('aiowps_captcha_string_info_time_'.$random_str, $current_time, false);
}
$equation_string .= '<input type="hidden" name="aiowps-captcha-string-info" class="aiowps-captcha-string-info" value="'.esc_attr($random_str).'" />';
$equation_string .= '<input type="hidden" name="aiowps-captcha-temp-string" class="aiowps-captcha-temp-string" value="'.esc_attr($current_time).'" />';
$equation_string .= '<input type="text" size="2" id="'.esc_attr($maths_captcha_input_id).'" class="aiowps-captcha-answer" name="aiowps-captcha-answer" value="" autocomplete="off" />';
return $equation_string;
}
/**
* This function takes a number and returns the word that represents that number
*
* @param integer $num - the number we want to map to a word
*
* @return string - the mapped word
*/
private function number_word_mapping($num) {
$number_map = array(
1 => esc_html__('one', 'all-in-one-wp-security-and-firewall'),
2 => esc_html__('two', 'all-in-one-wp-security-and-firewall'),
3 => esc_html__('three', 'all-in-one-wp-security-and-firewall'),
4 => esc_html__('four', 'all-in-one-wp-security-and-firewall'),
5 => esc_html__('five', 'all-in-one-wp-security-and-firewall'),
6 => esc_html__('six', 'all-in-one-wp-security-and-firewall'),
7 => esc_html__('seven', 'all-in-one-wp-security-and-firewall'),
8 => esc_html__('eight', 'all-in-one-wp-security-and-firewall'),
9 => esc_html__('nine', 'all-in-one-wp-security-and-firewall'),
10 => esc_html__('ten', 'all-in-one-wp-security-and-firewall'),
11 => esc_html__('eleven', 'all-in-one-wp-security-and-firewall'),
12 => esc_html__('twelve', 'all-in-one-wp-security-and-firewall'),
13 => esc_html__('thirteen', 'all-in-one-wp-security-and-firewall'),
14 => esc_html__('fourteen', 'all-in-one-wp-security-and-firewall'),
15 => esc_html__('fifteen', 'all-in-one-wp-security-and-firewall'),
16 => esc_html__('sixteen', 'all-in-one-wp-security-and-firewall'),
17 => esc_html__('seventeen', 'all-in-one-wp-security-and-firewall'),
18 => esc_html__('eighteen', 'all-in-one-wp-security-and-firewall'),
19 => esc_html__('nineteen', 'all-in-one-wp-security-and-firewall'),
20 => esc_html__('twenty', 'all-in-one-wp-security-and-firewall'),
);
return $number_map[$num];
}
/**
* This function will return the CAPTCHA script URL
*
* @param string $default_captcha - the default CAPTCHA
*
* @return string - the CAPTCHA script URL
*/
private function get_captcha_script_url($default_captcha) {
$url = '';
switch ($default_captcha) {
case 'cloudflare-turnstile':
$url = 'https://challenges.cloudflare.com/turnstile/v0/api.js';
break;
case 'google-recaptcha-v2':
$url = 'https://www.google.com/recaptcha/api.js?hl=' . $this->get_google_recaptcha_compatible_site_locale();
break;
default:
break;
}
return $url;
}
/**
* This function will return the CAPTCHA form
*
* @param string $default_captcha - the default CAPTCHA
* @param integer $include_wc_id - the WooCommerce form id to include, if 0 no id is included if 1 dynamic id included
* @param boolean $return_instead_of_echo - if we should return the form rather than echo it to page
*
* @return string - can return the CAPTCHA form
*/
public function get_captcha_form($default_captcha, $include_wc_id = 0, $return_instead_of_echo = false) {
global $aio_wp_security;
static $aios_wc_element_id;
$captcha_form = '';
$wc_form_id = !empty($include_wc_id) ? 'id="woo_recaptcha_'.(++$aios_wc_element_id).'"' : '';
$captcha_data_callback = apply_filters('aios_captcha_data_callback', false) ? ' data-callback="data_callback"' : '';
switch ($default_captcha) {
case 'cloudflare-turnstile':
$site_key = $aio_wp_security->configs->get_value('aiowps_turnstile_site_key');
$turnstile_theme = $aio_wp_security->configs->get_value('aiowps_turnstile_theme');
if (empty($turnstile_theme)) $turnstile_theme = 'auto';
$captcha_form = '<div class="cf-turnstile-wrap" style="padding:10px 0 10px 0"><div '. $wc_form_id .' class="cf-turnstile'. (!empty($include_wc_id) ? ' aios-wc-captcha' : '') . '" data-sitekey="'.esc_attr($site_key).'" data-theme="'.esc_attr($turnstile_theme).'"'.$captcha_data_callback.'></div></div>';
break;
case 'google-recaptcha-v2':
$site_key = $aio_wp_security->configs->get_value('aiowps_recaptcha_site_key');
$captcha_form = '<div class="g-recaptcha-wrap" style="padding:10px 0 10px 0"><div '. $wc_form_id .' class="g-recaptcha'. (!empty($include_wc_id) ? ' aios-wc-captcha' : '') . '" data-sitekey="'.esc_attr($site_key).'"'.$captcha_data_callback.'></div></div>';
break;
default:
return '';
break;
}
if ($return_instead_of_echo) return $captcha_form;
echo $captcha_form; // phpcs:ignore WordPress.Security.EscapeOutput.OutputNotEscaped -- Reason: escaped above
}
/**
* Verifies the math or Google reCAPTCHA v2 forms
* Returns TRUE if correct answer.
* Returns FALSE on wrong CAPTCHA result or missing data.
*
* @return boolean
*/
public function verify_captcha_submit() {
global $aio_wp_security;
$default_captcha = $aio_wp_security->configs->get_value('aiowps_default_captcha');
switch ($default_captcha) {
case 'cloudflare-turnstile':
// Cloudflare Turnstile enabled
if ('1' == $aio_wp_security->configs->get_value('aios_cloudflare_turnstile_invalid_configuration')) return true;
// Expected CAPTCHA field in $_POST but got none!
if (!array_key_exists('cf-turnstile-response', $_POST)) return false; // phpcs:ignore WordPress.Security.NonceVerification.Missing -- Reason: Nonce verification is skipped as the form is not generated by our code
$cf_turnstile_response = isset($_POST['cf-turnstile-response']) ? sanitize_text_field(wp_unslash($_POST['cf-turnstile-response'])) : ''; // phpcs:ignore WordPress.Security.NonceVerification.Missing -- Reason: Nonce verification is skipped as the form is not generated by our code
return $this->verify_turnstile_recaptcha($cf_turnstile_response);
break;
case 'google-recaptcha-v2':
// Google reCAPTCHA enabled
if ('1' == $aio_wp_security->configs->get_value('aios_google_recaptcha_invalid_configuration')) return true;
// Expected CAPTCHA field in $_POST but got none!
if (!array_key_exists('g-recaptcha-response', $_POST)) return false; // phpcs:ignore WordPress.Security.NonceVerification.Missing -- Reason: Nonce verification is skipped as the form is not generated by our code
$g_recaptcha_response = isset($_POST['g-recaptcha-response']) ? sanitize_text_field(wp_unslash($_POST['g-recaptcha-response'])) : ''; // phpcs:ignore WordPress.Security.NonceVerification.Missing -- Reason: Nonce verification is skipped as the form is not generated by our code
$verify_captcha = $this->verify_google_recaptcha($g_recaptcha_response);
return $verify_captcha;
break;
case 'simple-math':
// Math CAPTCHA is enabled
if (!array_key_exists('aiowps-captcha-answer', $_POST)) return false;// phpcs:ignore WordPress.Security.NonceVerification.Missing -- Reason: Nonce verification is skipped as the form is not generated by our code
$captcha_answer = isset($_POST['aiowps-captcha-answer']) ? sanitize_text_field(wp_unslash($_POST['aiowps-captcha-answer'])) : ''; // phpcs:ignore WordPress.Security.NonceVerification.Missing -- Reason: Nonce verification is skipped as the form is not generated by our code
$verify_captcha = $this->verify_math_captcha_answer($captcha_answer);
return $verify_captcha;
break;
default:
return true;
break;
}
}
/**
* Verifies the math CAPTCHA answer entered by the user
*
* @param type $captcha_answer
*
* @return boolean
*/
private function verify_math_captcha_answer($captcha_answer = '') {
global $aio_wp_security;
$captcha_secret_string = $aio_wp_security->configs->get_value('aiowps_captcha_secret_key');
$captcha_temp_string = isset($_POST['aiowps-captcha-temp-string']) ? sanitize_text_field(wp_unslash($_POST['aiowps-captcha-temp-string'])) : ''; // phpcs:ignore WordPress.Security.NonceVerification.Missing -- Reason: Nonce verification is skipped as the form is not generated by our code
$submitted_encoded_string = base64_encode($captcha_temp_string.$captcha_secret_string.$captcha_answer);
$trans_handle = isset($_POST['aiowps-captcha-string-info']) ? sanitize_text_field(wp_unslash($_POST['aiowps-captcha-string-info'])) : ''; // phpcs:ignore WordPress.Security.NonceVerification.Missing -- Reason: Nonce verification is skipped as the form is not generated by our code
if (is_multisite()) {
$captcha_string_info_option = get_site_option('aiowps_captcha_string_info_'.$trans_handle);
} else {
$captcha_string_info_option = get_option('aiowps_captcha_string_info_'.$trans_handle);
}
if ($submitted_encoded_string === $captcha_string_info_option) {
return true;
} else {
return false; // wrong answer was entered
}
}
/**
* Send a query to Cloudflare API to verify Turnstile submission
*
* @param string $resp_token
*
* @return boolean
*/
private function verify_turnstile_recaptcha($resp_token = '') {
global $aio_wp_security;
$url = $this->cloudflare_verify_turnstile_url;
$secret = $aio_wp_security->configs->get_value('aiowps_turnstile_secret_key');
return $this->verify_captcha_response($url, $secret, $resp_token);
}
/**
* Send a query to Google API to verify reCAPTCHA submission
*
* @param string $resp_token
*
* @return boolean
*/
private function verify_google_recaptcha($resp_token = '') {
global $aio_wp_security;
$url = $this->google_verify_recaptcha_url;
$secret = $aio_wp_security->configs->get_value('aiowps_recaptcha_secret_key');
return $this->verify_captcha_response($url, $secret, $resp_token);
}
/**
* This function sends a remote request to verify the captcha response.
*
* @param string $url - The URL to the CAPTCHA API.
* @param string $secret - The secret key you got from the CAPTCHA provider.
* @param string $resp_token - The value of the CAPTCHA response form field.
*
* @return boolean - true if valid otherwise false
*/
private function verify_captcha_response($url, $secret, $resp_token) {
$is_humanoid = false;
if (empty($resp_token)) return $is_humanoid;
$ip_address = AIOWPSecurity_Utility_IP::get_user_ip_address();
$response = wp_safe_remote_post($url, array(
'body' => array(
'secret' => $secret,
'response' => $resp_token,
'remoteip' => $ip_address,
),
));
if (wp_remote_retrieve_response_code($response) != 200) return $is_humanoid;
$response = wp_remote_retrieve_body($response);
$response = json_decode($response, true);
if (isset($response['success']) && true == $response['success']) $is_humanoid = true;
// We did not get a success response so check for the "timeout-or-duplicate" error code because it's possible we have sent this request a second time if another plugin has recalled the WP authentication code and this error code means the captcha has already been solved so return success
if (isset($response['error-codes']) && in_array('timeout-or-duplicate', $response['error-codes'])) $is_humanoid = true;
return $is_humanoid;
}
/**
* Get site locale code for Google reCaptcha.
*
* @return string The site locale code.
*/
private function get_google_recaptcha_compatible_site_locale() {
$google_recaptcha_locale_codes = AIOS_Abstracted_Ids::get_google_recaptcha_locale_codes();
$locale = str_replace('_', '-', determine_locale());
if (in_array($locale, $google_recaptcha_locale_codes, true)) {
return $locale;
}
// Return 2 letter locale code.
$locale = explode('-', $locale);
return $locale[0];
}
/**
* Verify Cloudflare Turnstile configuration.
*
* @param String $site_key
* @param String $secret_key
*
* @return Boolean
*/
public function cloudflare_turnstile_verify_configuration($site_key, $secret_key) {
if (empty($site_key) || empty($secret_key)) return false;
return true;
}
/**
* Verify Google reCAPTCHA configuration.
*
* @param String $site_key
* @param String $secret_key
*
* @return Boolean
*/
public function google_recaptcha_verify_configuration($site_key, $secret_key) {
$site_key_verify_params = array('k' => $site_key, 'size' => 'checkbox');
$site_key_verify_url = esc_url(add_query_arg($site_key_verify_params, 'https://www.google.com/recaptcha/api2/anchor'));
$site_key_verify_response_body = wp_remote_retrieve_body(wp_remote_get($site_key_verify_url));
$secret_key_verify_params = array('secret' => $secret_key);
$secret_key_verify_url = esc_url(add_query_arg($secret_key_verify_params, $this->google_verify_recaptcha_url));
$secret_key_verify_response_body = wp_remote_retrieve_body(wp_remote_get($secret_key_verify_url));
$secret_key_verify_json = json_decode($secret_key_verify_response_body, true);
if (false !== strpos($site_key_verify_response_body, 'Invalid site key') || is_null($secret_key_verify_json) || (isset($secret_key_verify_json['error-codes']) && in_array('invalid-input-secret', $secret_key_verify_json['error-codes']))) {
return false;
} else {
return true;
}
}
/**
* This function adds captcha to contact form 7
*
* @param array $form_properties - this is the array containing properties for the form
*
* @return array $form_properties - containing the edited form with the captcha if everything is set
*/
public function add_contact_form_7_captcha($form_properties) {
global $aio_wp_security;
if (!class_exists('WPCF7_RECAPTCHA') || is_admin()) return $form_properties; // if wpc7_recaptcha does not exist or the call is from the admin page
$recaptcha_service = WPCF7_RECAPTCHA::get_instance();
// if recaptcha is active return form
if ($recaptcha_service->is_active()) return $form_properties;
$default_captcha = $aio_wp_security->configs->get_value('aiowps_default_captcha');
// check if default captcha configuration is correct
if (!$this->verify_captcha_configuration($default_captcha)) {
$aio_wp_security->debug_logger->log_debug("The captcha $default_captcha is not correctly configured", 4);
return $form_properties;
}
$form = isset($form_properties['form']) ? $form_properties['form'] : '';
if (empty($form)) return $form_properties;
// enqueue script
wp_enqueue_script($default_captcha, $this->get_captcha_script_url($default_captcha), array(), AIO_WP_SECURITY_VERSION, false);
$field = $this->display_captcha_form($default_captcha, true);
$field .= "<span class='wpcf7-form-control-wrap' data-name='aiowps-captcha'></span>"; // add validation field for the captcha
$captcha_shortcode = sprintf('[%s]', AIOWPSEC_CAPTCHA_SHORTCODE);
if (false !== strpos($form, $captcha_shortcode)) {
$replacement_string = $captcha_shortcode;
} else {
$replacement_string = '[submit';
// if shortcode doesn't exist in form then use the submit button as placement for the captcha
if (false !== stripos($form, $replacement_string)) {
$field .= $replacement_string;
} else {
$pattern = '/<input[^>]+type\s*=\s*(["\']?)submit\\1[^>]*>/i';
if (preg_match($pattern, $form, $matches)) {
$field .= $matches[0];
$replacement_string = $matches[0];
}
}
}
// replace first occurrence of replacement string
$form = preg_replace('/' . preg_quote($replacement_string, '/') . '/', $field, $form, 1);
$form_properties['form'] = $form;
return $form_properties;
}
/**
* This verifies contact form 7 captcha
*
* @param WPCF7_Validation $result - This is the form result from contact form 7 plugin
* @return WPCF7_Validation - The validation for a contact form 7 form
*/
public function verify_contact_form_7_captcha($result) {
if (!class_exists('WPCF7_Submission') || !class_exists('WPCF7_RECAPTCHA')) return $result;
$recaptcha_service = WPCF7_RECAPTCHA::get_instance();
// if recaptcha is active return result
if ($recaptcha_service->is_active()) return $result;
$post = WPCF7_Submission::get_instance();
$message = esc_html__('Your CAPTCHA answer was incorrect - please try again.', 'all-in-one-wp-security-and-firewall');
if (!empty($post)) {
$data = $post->get_posted_data();
$field_name = $this->get_contact_form_7_captcha_post_field_name();
if (empty($field_name) || false === array_key_exists($field_name, $data)) return $result; // if field name is empty or field doesn't exist return
if (empty($data[$field_name])) {
$result->invalidate(array('type' => 'captcha', 'name' => 'aiowps-captcha'), $message);
return $result;
}
$verify = $this->verify_captcha_submit();
if (!$verify) {
$result->invalidate(array('type' => 'captcha', 'name' => 'aiowps-captcha'), $message);
return $result;
}
}
return $result;
}
/**
* This function gets the field name for the captcha
*
* @return string - The field name for the CAPTCHA if the feature is activated, an empty string if it's not
*/
private function get_contact_form_7_captcha_post_field_name() {
global $aio_wp_security;
$default_captcha = $aio_wp_security->configs->get_value('aiowps_default_captcha');
$field = '';
switch ($default_captcha) {
case 'cloudflare-turnstile':
$field = 'cf-turnstile-response';
break;
case 'google-recaptcha-v2':
$field = 'g-recaptcha-response';
break;
case 'simple-math':
$field = 'aiowps-captcha-answer';
break;
}
return $field;
}
/**
* This checks if the default captcha is configured correctly
*
* @param string $default_captcha - the default CAPTCHA
*
* @return bool - True if the captcha configuration is correct, otherwise false.
*/
public function verify_captcha_configuration($default_captcha) {
global $aio_wp_security;
if (empty($default_captcha)) return false;
$verify = true;
switch ($default_captcha) {
case 'cloudflare-turnstile':
$verify = $this->cloudflare_turnstile_verify_configuration($aio_wp_security->configs->get_value('aiowps_turnstile_site_key'), $aio_wp_security->configs->get_value('aiowps_turnstile_secret_key'));
break;
case 'google-recaptcha-v2':
$verify = $this->google_recaptcha_verify_configuration($aio_wp_security->configs->get_value('aiowps_recaptcha_site_key'), $aio_wp_security->configs->get_value('aiowps_recaptcha_secret_key'));
break;
}
return $verify;
}
/**
* This function adds the aiowps contact form 7 CAPTCHA
*
* @return void
*/
public function add_contact_form_7_captcha_tag_generator_button() {
if (!class_exists('WPCF7_TagGenerator')) return;
$tag_generator = WPCF7_TagGenerator::get_instance();
/* translators: %s: Plugin name */
$tag_generator->add('aios-captcha', sprintf(esc_html__('%s captcha', 'all-in-one-wp-security-and-firewall'), 'aios'), array($this, 'contact_form_7_tag_generator_button'), array('version' => '2'));
}
/**
* This function is the callback for adding the captcha tag
*
* @return void
*/
public function contact_form_7_tag_generator_button() {
$type = AIOWPSEC_CAPTCHA_SHORTCODE;
?>
<div class="control-box">
<fieldset>
<?php /* translators: %s: CAPTCHA provider name */ ?>
<legend><?php printf(esc_html__("Generate a form-tag to use %s CAPTCHA", 'all-in-one-wp-security-and-firewall'), 'AIOS'); ?></legend>
</fieldset>
</div>
<div class="insert-box">
<input type="text" name="<?php echo esc_attr($type); ?>" value="[<?php echo esc_attr($type); ?>]" class="tag code" readonly="readonly" onfocus="this.select()" />
<div class="submitbox">
<input type="button" class="button button-primary insert-tag" value="<?php echo esc_attr(__('Insert tag', 'all-in-one-wp-security-and-firewall')); ?>" />
</div>
</div>
<?php
}
/**
* Verifies the captcha on the MemberPress lost password form.
*
* This function checks if the captcha verification on the MemberPress lost password form was successful.
* If the captcha is incorrect, an error message is added to the errors array.
*
* @param array $errors An array of error messages.
* @return array The modified array of error messages.
*/
public function verify_memberpress_form($errors) {
if (!$this->verify_captcha_submit()) {
/* translators: %s: Error message with HTML markup */
$errors[] = sprintf(esc_html__('%s: Your answer was incorrect - please try again.', 'all-in-one-wp-security-and-firewall'), '<strong>' . __('ERROR', 'all-in-one-wp-security-and-firewall') . '</strong>');
}
return $errors;
}
}