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Edit File: wfRESTAuthenticationController.php

<?php

class wfRESTAuthenticationController {

const NONCE_AGE = 600;

public static function generateNonce($tickOffset = 0) {
		add_filter('nonce_life', 'wfRESTAuthenticationController::nonceAge');

$i = wp_nonce_tick();
		$salt = wp_salt('nonce');
		$nonce = hash_hmac('sha256', ($i + $tickOffset) . '|wordfence-rest-api-auth', $salt);

remove_filter('nonce_life', 'wfRESTAuthenticationController::nonceAge');

return $nonce;
	}

public static function generateToken() {
		return new wfJWT(wfConfig::get('wordfenceCentralSiteID'));
	}

public static function nonceAge() {
		return self::NONCE_AGE;
	}

public function registerRoutes() {
		register_rest_route('wordfence/v1', '/authenticate', array(
			'methods'  => WP_REST_Server::READABLE,
			'callback' => array($this, 'nonce'),
			'permission_callback' => '__return_true',
		));
		register_rest_route('wordfence/v1', '/authenticate', array(
			'methods'  => WP_REST_Server::CREATABLE,
			'callback' => array($this, 'authenticate'),
			'permission_callback' => '__return_true',
		));
		register_rest_route('wordfence/v1', '/authenticate-premium', array(
			'methods'  => WP_REST_Server::CREATABLE,
			'callback' => array($this, 'authenticatePremium'),
			'permission_callback' => '__return_true',
		));
	}

/**
	 * @param WP_REST_Request $request
	 * @return mixed|WP_REST_Response
	 */
	public function nonce($request) {
		$response = rest_ensure_response(array(
			'nonce' => self::generateNonce(),
			'admin_url' => network_admin_url(),
		));
		return $response;
	}

/**
	 * @param WP_REST_Request $request
	 * @return mixed|WP_REST_Response
	 */
	public function authenticate($request) {
		require_once(WORDFENCE_PATH . '/crypto/vendor/paragonie/sodium_compat/autoload-fast.php');

$siteID = wfConfig::get('wordfenceCentralSiteID');
		if (!$siteID) {
			return new WP_Error('rest_forbidden_context',
				__('Site is not connected to Wordfence Central.', 'wordfence'),
				array('status' => rest_authorization_required_code()));
		}

// verify signature.
		$data = $request->get_param('data');
		$dataChunks = explode('|', $data, 2);
		if (count($dataChunks) !== 2) {
			return new WP_Error('rest_forbidden_context',
				__('Data is invalid.', 'wordfence'),
				array('status' => rest_authorization_required_code()));
		}
		if (!preg_match('/[0-9a-f]{64}/i', $dataChunks[0])) {
			return new WP_Error('rest_forbidden_context',
				__('Nonce format is invalid.', 'wordfence'),
				array('status' => rest_authorization_required_code()));
		}
		if (!preg_match('/[0-9a-f\-]{36}/i', $dataChunks[1])) {
			return new WP_Error('rest_forbidden_context',
				__('Site ID is invalid.', 'wordfence'),
				array('status' => rest_authorization_required_code()));
		}
		if (!hash_equals($siteID, $dataChunks[1])) {
			return new WP_Error('rest_forbidden_context',
				__('Site ID is invalid.', 'wordfence'),
				array('status' => rest_authorization_required_code()));
		}

$signature = $request->get_param('signature');
		$nonce1 = self::generateNonce();
		$nonce2 = self::generateNonce(-1);
		$verfiedNonce = hash_equals($nonce1, $dataChunks[0]) || hash_equals($nonce2, $dataChunks[0]);

if (!$verfiedNonce) {
			return new WP_Error('rest_forbidden_context',
				__('Nonce is invalid.', 'wordfence'),
				array('status' => rest_authorization_required_code()));
		}
		$signature = pack('H*', $signature);
		if (!ParagonIE_Sodium_Compat::crypto_sign_verify_detached($signature, $data, wfConfig::get('wordfenceCentralPK'))) {
			return new WP_Error('rest_forbidden_context',
				__('Signature is invalid.', 'wordfence'),
				array('status' => rest_authorization_required_code()));
		}

$response = rest_ensure_response(array(
			'token' => (string) self::generateToken(),
		));
		return $response;
	}

/**
	 * @param WP_REST_Request $request
	 * @return mixed|WP_REST_Response
	 */
	public function authenticatePremium($request) {
		require_once(WORDFENCE_PATH . '/crypto/vendor/paragonie/sodium_compat/autoload-fast.php');

// verify signature.
		$data = $request->get_param('data');
		$dataChunks = explode('|', $data, 2);
		if (count($dataChunks) !== 2) {
			return new WP_Error('rest_forbidden_context',
				__('Data is invalid.', 'wordfence'),
				array('status' => rest_authorization_required_code()));
		}
		if (!preg_match('/[0-9a-f]{64}/i', $dataChunks[0])) {
			return new WP_Error('rest_forbidden_context',
				__('Nonce format is invalid.', 'wordfence'),
				array('status' => rest_authorization_required_code()));
		}
		if (!is_email($dataChunks[1])) {
			return new WP_Error('rest_forbidden_context',
				__('Email address is invalid.', 'wordfence'),
				array('status' => rest_authorization_required_code()));
		}

$adminEmail = $dataChunks[1];

if (!$verfiedNonce) {
			return new WP_Error('rest_forbidden_context',
				__('Nonce is invalid.', 'wordfence'),
				array('status' => rest_authorization_required_code()));
		}
		$signature = pack('H*', $signature);
		if (!ParagonIE_Sodium_Compat::crypto_sign_verify_detached($signature, $data, WORDFENCE_CENTRAL_PUBLIC_KEY)) {
			return new WP_Error('rest_forbidden_context',
				__('Signature is invalid.', 'wordfence'),
				array('status' => rest_authorization_required_code()));
		}

$user_query = new WP_User_Query(array(
			'role'           => 'administrator',
			'search'         => $adminEmail,
			'search_columns' => array('user_email')
		));
		$users = $user_query->get_results();
		if (is_array($users) && count($users) === 1) {
			$jwt = new wfJWT('wordfence-central-premium');
			$jwt->addClaims(array('email' => $adminEmail));
			$response = rest_ensure_response(array(
				'token' => (string) $jwt,
			));
			return $response;
		}

return new WP_Error('rest_forbidden_context',
			__('Admin user with this email address not found.', 'wordfence'),
			array('status' => rest_authorization_required_code()));
	}

}

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