Proyectos de Subversion Moodle

<?php

// This file is part of Moodle - http://moodle.org/

//

// Moodle is free software: you can redistribute it and/or modify

// it under the terms of the GNU General Public License as published by

// the Free Software Foundation, either version 3 of the License, or

// (at your option) any later version.

//

// Moodle is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

// GNU General Public License for more details.

//

// You should have received a copy of the GNU General Public License

// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

namespace factor_sms;

use moodle_url;

use stdClass;

use tool_mfa\local\factor\object_factor_base;

/**

 * SMS Factor implementation.

 *

 * @package     factor_sms

 * @subpackage  tool_mfa

 * @author      Peter Burnett <peterburnett@catalyst-au.net>

 * @copyright   Catalyst IT

 * @license     http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later

 */

class factor extends object_factor_base {

    /** @var string Factor icon */

    protected $icon = 'fa-commenting-o';

    /**

     * Defines login form definition page for SMS Factor.

     *

     * @param \MoodleQuickForm $mform

     * @return \MoodleQuickForm $mform

     */

    public function login_form_definition(\MoodleQuickForm $mform): \MoodleQuickForm {

        $mform->addElement(new \tool_mfa\local\form\verification_field());

        $mform->setType('verificationcode', PARAM_ALPHANUM);

        return $mform;

    }

    /**

     * Defines login form definition page after form data has been set.

     *

     * @param \MoodleQuickForm $mform Form to inject global elements into.

     * @return \MoodleQuickForm $mform

     */

    public function login_form_definition_after_data(\MoodleQuickForm $mform): \MoodleQuickForm {

        $this->generate_and_sms_code();

        // Disable the form check prompt.

        $mform->disable_form_change_checker();

        return $mform;

    }

    /**

     * Implements login form validation for SMS Factor.

     *

     * @param array $data

     * @return array

     */

    public function login_form_validation(array $data): array {

        $return = [];

        if (!$this->check_verification_code($data['verificationcode'])) {

            $return['verificationcode'] = get_string('error:wrongverification', 'factor_sms');

        }

        return $return;

    }

    /**

     * Gets the string for setup button on preferences page.

     *

     * @return string

     */

    public function get_setup_string(): string {

        return get_string('setupfactorbutton', 'factor_sms');

    }

    /**

     * Gets the string for manage button on preferences page.

     *

     * @return string

     */

    public function get_manage_string(): string {

        return get_string('managefactorbutton', 'factor_sms');

    }

    /**

     * Defines setup_factor form definition page for SMS Factor.

     *

     * @param \MoodleQuickForm $mform

     * @return \MoodleQuickForm $mform

     */

    public function setup_factor_form_definition(\MoodleQuickForm $mform): \MoodleQuickForm {

        global $OUTPUT, $USER, $DB;

        if (!empty(

            $phonenumber = $DB->get_field('tool_mfa', 'label', ['factor' => $this->name, 'userid' => $USER->id, 'revoked' => 0])

        )) {

            redirect(

                new \moodle_url('/admin/tool/mfa/user_preferences.php'),

                get_string('factorsetup', 'tool_mfa', $phonenumber),

                null,

                \core\output\notification::NOTIFY_SUCCESS);

        }

        $mform->addElement('html', $OUTPUT->heading(get_string('setupfactor', 'factor_sms'), 2));

        if (empty($this->get_phonenumber())) {

            $mform->addElement('hidden', 'verificationcode', 0);

            $mform->setType('verificationcode', PARAM_ALPHANUM);

            // Add field for phone number setup.

            $mform->addElement('text', 'phonenumber', get_string('addnumber', 'factor_sms'),

                [

                    'autocomplete' => 'tel',

                    'inputmode' => 'tel',

                ]);

            $mform->setType('phonenumber', PARAM_TEXT);

            // HTML to display a message about the phone number.

            $message = \html_writer::tag('div', '', ['class' => 'col-md-3']);

            $message .= \html_writer::tag(

                'div', \html_writer::tag('p', get_string('phonehelp', 'factor_sms')), ['class' => 'col-md-9']);

            $mform->addElement('html', \html_writer::tag('div', $message, ['class' => 'row']));

        }

        return $mform;

    }

    /**

     * Defines setup_factor form definition page after form data has been set.

     *

     * @param \MoodleQuickForm $mform

     * @return \MoodleQuickForm $mform

     */

    public function setup_factor_form_definition_after_data(\MoodleQuickForm $mform): \MoodleQuickForm {

        global $OUTPUT;

        $phonenumber = $this->get_phonenumber();

        if (empty($phonenumber)) {

            return $mform;

        }

        $duration = get_config('factor_sms', 'duration');

        $code = $this->secretmanager->create_secret($duration, true);

        if (!empty($code)) {

            $this->sms_verification_code($code, $phonenumber);

        }

        $message = get_string('logindesc', 'factor_sms', '<b>' . $phonenumber . '</b><br/>');

        $message .= get_string('editphonenumberinfo', 'factor_sms');

        $mform->addElement('html', \html_writer::tag('p', $OUTPUT->notification($message, 'success')));

        $mform->addElement(new \tool_mfa\local\form\verification_field());

        $mform->setType('verificationcode', PARAM_ALPHANUM);

        $editphonenumber = \html_writer::link(

            new \moodle_url('/admin/tool/mfa/factor/sms/editphonenumber.php', ['sesskey' => sesskey()]),

            get_string('editphonenumber', 'factor_sms'),

            ['class' => 'btn btn-secondary', 'type' => 'button']);

        $mform->addElement('html', \html_writer::tag('div', $editphonenumber, ['class' => 'float-sm-left col-md-4']));

        // Disable the form check prompt.

        $mform->disable_form_change_checker();

        return $mform;

    }

    /**

     * Returns the phone number from the current session or from the user profile data.

     * @return string|null

     */

    private function get_phonenumber(): ?string {

        global $SESSION, $USER, $DB;

        if (!empty($SESSION->tool_mfa_sms_number)) {

            return $SESSION->tool_mfa_sms_number;

        }

        $phonenumber = $DB->get_field('tool_mfa', 'label', ['factor' => $this->name, 'userid' => $USER->id, 'revoked' => 0]);

        if (!empty($phonenumber)) {

            return $phonenumber;

        }

        return null;

    }

    /**

     * Returns an array of errors, where array key = field id and array value = error text.

     *

     * @param array $data

     * @return array

     */

    public function setup_factor_form_validation(array $data): array {

        $errors = [];

        // Phone number validation.

        if (!empty($data["phonenumber"]) && empty(helper::is_valid_phonenumber($data["phonenumber"]))) {

            $errors['phonenumber'] = get_string('error:wrongphonenumber', 'factor_sms');

        } else if (!empty($this->get_phonenumber())) {

            // Code validation.

            if (empty($data["verificationcode"])) {

                $errors['verificationcode'] = get_string('error:emptyverification', 'factor_sms');

            } else if ($this->secretmanager->validate_secret($data['verificationcode']) !== $this->secretmanager::VALID) {

                $errors['verificationcode'] = get_string('error:wrongverification', 'factor_sms');

            }

        }

        return $errors;

    }

    /**

     * Reset values of the session data of the given factor.

     *

     * @param int $factorid

     * @return void

     */

    public function setup_factor_form_is_cancelled(int $factorid): void {

        global $SESSION;

        if (!empty($SESSION->tool_mfa_sms_number)) {

            unset($SESSION->tool_mfa_sms_number);

        }

        // Clean temp secrets code.

        $secretmanager = new \tool_mfa\local\secret_manager('sms');

        $secretmanager->cleanup_temp_secrets();

    }

    /**

     * Setup submit button string in given factor

     *

     * @return string|null

     */

    public function setup_factor_form_submit_button_string(): ?string {

        global $SESSION;

        if (!empty($SESSION->tool_mfa_sms_number)) {

            return get_string('setupsubmitcode', 'factor_sms');

        }

        return get_string('setupsubmitphone', 'factor_sms');

    }

    /**

     * Adds an instance of the factor for a user, from form data.

     *

     * @param stdClass $data

     * @return stdClass|null the factor record, or null.

     */

    public function setup_user_factor(stdClass $data): ?stdClass {

        global $DB, $SESSION, $USER;

        // Handle phone number submission.

        if (empty($SESSION->tool_mfa_sms_number)) {

            $SESSION->tool_mfa_sms_number = !empty($data->phonenumber) ? $data->phonenumber : '';

            $addurl = new \moodle_url('/admin/tool/mfa/action.php', [

                'action' => 'setup',

                'factor' => 'sms',

            ]);

            redirect($addurl);

        }

        // If the user somehow gets here through form resubmission.

        // We dont want two phones active.

        if ($DB->record_exists('tool_mfa', ['userid' => $USER->id, 'factor' => $this->name, 'revoked' => 0])) {

            return null;

        }

        $time = time();

        $label = $this->get_phonenumber();

        $row = new \stdClass();

        $row->userid = $USER->id;

        $row->factor = $this->name;

        $row->secret = '';

        $row->label = $label;

        $row->timecreated = $time;

        $row->createdfromip = $USER->lastip;

        $row->timemodified = $time;

        $row->lastverified = $time;

        $row->revoked = 0;

        $id = $DB->insert_record('tool_mfa', $row);

        $record = $DB->get_record('tool_mfa', ['id' => $id]);

        $this->create_event_after_factor_setup($USER);

        // Remove session phone number.

        unset($SESSION->tool_mfa_sms_number);

        return $record;

    }

    /**

     * Returns an array of all user factors of given type.

     *

     * @param stdClass $user the user to check against.

     * @return array

     */

    public function get_all_user_factors(stdClass $user): array {

        global $DB;

        $sql = 'SELECT *

                  FROM {tool_mfa}

                 WHERE userid = ?

                   AND factor = ?

                   AND label IS NOT NULL

                   AND revoked = 0';

        return $DB->get_records_sql($sql, [$user->id, $this->name]);

    }

    /**

     * Returns the information about factor availability.

     *

     * @return bool

     */

    public function is_enabled(): bool {

        if (empty(get_config('factor_sms', 'gateway'))) {

            return false;

        }

        $class = '\factor_sms\local\smsgateway\\' . get_config('factor_sms', 'gateway');

        if (!call_user_func($class . '::is_gateway_enabled')) {

            return false;

        }

        return parent::is_enabled();

    }

    /**

     * Decides if a factor requires input from the user to verify.

     *

     * @return bool

     */

    public function has_input(): bool {

        return true;

    }

    /**

     * Decides if factor needs to be setup by user and has setup_form.

     *

     * @return bool

     */

    public function has_setup(): bool {

        return true;

    }

    /**

     * Decides if the setup buttons should be shown on the preferences page.

     *

     * @return bool

     */

    public function show_setup_buttons(): bool {

        return true;

    }

    /**

     * Returns true if factor class has factor records that might be revoked.

     * It means that user can revoke factor record from their profile.

     *

     * @return bool

     */

    public function has_revoke(): bool {

        return true;

    }

    /**

     * Generates and sms' the code for login to the user, stores codes in DB.

     *

     * @return int|null the instance ID being used.

     */

    private function generate_and_sms_code(): ?int {

        global $DB, $USER;

        $duration = get_config('factor_sms', 'duration');

        $instance = $DB->get_record('tool_mfa', ['factor' => $this->name, 'userid' => $USER->id, 'revoked' => 0]);

        if (empty($instance)) {

            return null;

        }

        $secret = $this->secretmanager->create_secret($duration, false);

        // There is a new code that needs to be sent.

        if (!empty($secret)) {

            // Grab the singleton SMS record.

            $this->sms_verification_code($secret, $instance->label);

        }

        return $instance->id;

    }

    /**

     * This function sends an SMS code to the user based on the phonenumber provided.

     *

     * @param int $secret the secret to send.

     * @param string|null $phonenumber the phonenumber to send the verification code to.

     * @return void

     */

    private function sms_verification_code(int $secret, ?string $phonenumber): void {

        global $CFG, $SITE;

        // Here we should get the information, then construct the message.

        $url = new moodle_url($CFG->wwwroot);

        $content = [

            'fullname' => $SITE->fullname,

            'url' => $url->get_host(),

            'code' => $secret,

        ];

        $message = get_string('smsstring', 'factor_sms', $content);

        $class = '\factor_sms\local\smsgateway\\' . get_config('factor_sms', 'gateway');

        $gateway = new $class();

        $gateway->send_sms_message($message, $phonenumber);

    }

    /**

     * Verifies entered code against stored DB record.

     *

     * @param string $enteredcode

     * @return bool

     */

    private function check_verification_code(string $enteredcode): bool {

        return ($this->secretmanager->validate_secret($enteredcode) === \tool_mfa\local\secret_manager::VALID) ? true : false;

    }

    /**

     * Returns all possible states for a user.

     *

     * @param \stdClass $user

     */

    public function possible_states(\stdClass $user): array {

        return [

            \tool_mfa\plugininfo\factor::STATE_PASS,

            \tool_mfa\plugininfo\factor::STATE_NEUTRAL,

            \tool_mfa\plugininfo\factor::STATE_FAIL,

            \tool_mfa\plugininfo\factor::STATE_UNKNOWN,

        ];

    }

    /**

     * Get the login description associated with this factor.

     * Override for factors that have a user input.

     *

     * @return string The login option.

     */

    public function get_login_desc(): string {

        $phonenumber = $this->get_phonenumber();

        if (empty($phonenumber)) {

            return get_string('errorsmssent', 'factor_sms');

        } else {

            return get_string('logindesc', 'factor_' . $this->name, $phonenumber);

        }

    }

}