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<?php

/**

 * Copyright (c) 2025, Daily Data, Inc.

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without modification,

 * are permitted provided that the following conditions are met:

 *

 * 1. Redistributions of source code must retain the above copyright notice, this list

 *    of conditions and the following disclaimer.

 * 2. Redistributions in binary form must reproduce the above copyright notice, this

 *    list of conditions and the following disclaimer in the documentation and/or other

 *    materials provided with the distribution.

 * 3. Neither the name of Daily Data, Inc. nor the names of its contributors may be

 *    used to endorse or promote products derived from this software without specific

 *    prior written permission.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY

 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES

 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT

 * SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,

 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED

 * TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR

 * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN

 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN

 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH

 * DAMAGE.

 */

/**

   PHP script which reads configuration file containing user information. Users

   are presented with a username and password box and a router selector.

   When processed, will read data file and determine if the credentials match any line

   and

   * display a QR Code suitable for scanning with one time authentication app

   * display the OTP seed code in case user wants to enter it manually

   * provide a link to download the OpenVPN configuration file for that user

   Assumes configuration file generated by loadOpnSense.pl

   Assumes QR code images are pre-generated and stored in a web accessible location

   Assumes OpenVPN configuration files are pre-generated and stored in a web accessible location

   Assumes passwords are hashed using password_hash function

   The configuration file is a json file with the following structure

   {

      "router1" : {

         "users" : {

            "user1" : {

               "password" : "<hashed password>",

               "otp_seed" : "<otp seed>",

               "qrFile" : "<path to qr code image file>",

               "ovpnFile" : "<path to openvpn config file>"

            },

            "user2" : {

               ...

            }

         }

      },

      "router2" : {

         ...

      }

   }

   Version 1.0.0 RWR 2025-09-21

      Initial Release

   Version 1.1.0 RWR 2025-09-27

      Added capability of downloading VPN configuration file

   Version 1.2.0 RWR 2025-10-01

     Reading from json file instead of csv

     Removed dependency on exec and external commands

     Added logging of successful logins

     automatically generate router list from config file

     Added some error checking for missing qr code image file and ovpn file

 */

// this is the only variable you may need to change

// everything else is in the configuration file

$configFile = './users.json';

// we need the config data for form processing and validation, so always load it

if ( file_exists( $configFile ) ) {

   $configData = json_decode( file_get_contents( $configFile ), true );

} else {

   die( "Configuration file $configFile not found" );

}

// Check if the form is submitted

if ($_SERVER['REQUEST_METHOD'] == 'POST') {

   // Get the username and password from the form

    $username = $_POST['username'];

    $password = $_POST['password'];

    $router = $_POST['router'];

    if ( $configData ) {

       $isValidUser = false;

      if ( isset( $configData[$router]) && isset( $configData[$router]['users'][$username] ) ) {

         $data = $configData[$router]['users'][$username];

         if ( password_verify( $password, $data['password'] ) ) {

            $isValidUser = true;

            $code = $data['otp_seed'] ?? 'unknown';

            $imageFileName = $data['qrFile'];

            $ovpnFileName = $data['ovpnFile'];

            $log = date("Y-m-d H:i:s") . "\t" . $_SERVER['REMOTE_ADDR'] . "\t" .

            "Success\t" . $username."\t" .PHP_EOL;

            file_put_contents( './log_'.date("j.n.Y").'.log', $log, FILE_APPEND );

         }

      }

   } else {

      print '<h1>Could not open the configuration file.</h1>';

   }

   if ( ! $isValidUser )

         print "<h1>Password wrong, or invalid user $username for router $router</h1>";

} // if form submitted

?>

<!DOCTYPE html>

<html lang="en">

<head>

    <meta charset="UTF-8">

    <meta name="viewport" content="width=device-width, initial-scale=1.0">

    <title>Get QR Code</title>

</head>

<body>

    <?php

       if ( ! empty( $imageFileName ) && ! empty( $code ) ) {

         print "<div style='text-align: center;'>";

         if ( empty($imageFileName) || !file_exists($imageFileName)) {

            print "<p><b>QR Code image file not found</b></p>";

         } else {

            // all good

            print "<img src='$imageFileName' alt='$code'>";

         }

         print "<br />Your code for $router is<br /><b>$code</b>";

         if ( empty( $ovpnFileName ) ) {

            print "<br />No OpenVPN configuration file available";

         } else {

            print "<br /><a href='$ovpnFileName' download>Download your OpenVPN Config File</a>";

         }

         print '</div>';

      }

    ?>

    <p>This page is updated hourly. If change your password, it will not be reflected here for an hour</p>

    <form method="POST" action="">

        <label for="username">Username:</label>

        <input type="text" id="username" name="username" required>

        <br>

        <label for="password">Password:</label>

        <input type="password" id="password" name="password" required>

        <br>

        <label for="router">Router:</label>

         <select name="router" id="router">

             <?php

               // gets a list of all routers listed in $csvFile into array $routers

               $routers = array_keys( $configData );

                #die( "<pre>" . print_r( $routers, true) . "</pre>" );

                foreach ( $routers as $index => $name ) {

                   print "<option value='$name'>$name</option>\n";

                }

            ?>

         </select>        

        <br>

        <input type="submit" value="Login">

    </form>

</body>

</html>