php_password/index.php at master · cavo789/php_password · GitHub

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<?php

// Only valid if PHP7 or greater
// declare(strict_types = 1);

/*
 * AUTHOR : AVONTURE Christophe.
 *
 * Written date : 24 october 2018
 *
 * PHP Password interface
 *
 * For the maximum security, use the Argon2 hashing algorithm and for this reason, requires a
 * least PHP 7.2
 *
 * Last mod:
 * 2019-01-08 - Abandonment of jQuery and migration to vue.js
 *                  Except for clipboard.min.js which requires jQuery
 */

define('REPO', 'https://github.com/cavo789/php_password');

// Retrieve posted data
$data = json_decode(file_get_contents('php://input'), true);
$task = trim(filter_var(($data['task'] ?? ''), FILTER_SANITIZE_FULL_SPECIAL_CHARS));

if ('hash' == $task) {
    // Hash the password
    $PWD = base64_decode(trim(filter_var(($data['PWD'] ?? ''), FILTER_SANITIZE_FULL_SPECIAL_CHARS)));

    // Default is PASSWORD_BCRYPT
    // Always start with "$2y$" and has a length of 60 characters
    // As from PHP 7.2, best to use Argon2 hashing algorithm.
    // According to cryptographic expert Argon is one of the best cryptographic function.
    // This algorithm had won  Password Hashing Competition in July 2015.

    // --> the following line requires PHP 7.2 but make sure that ARGON2I is well defined
    if (defined('PASSWORD_ARGON2I')) {
        $PWD = password_hash($PWD, PASSWORD_ARGON2I);
    } else {
        $PWD = password_hash($PWD, PASSWORD_DEFAULT);
    }

    $arr = [];

    if (false !== $PWD) {
        $arr['hash'] = base64_encode($PWD);
    } else {
        // Ouch... an error has occurred
        $arr['hash']   = '';
    }

    header('Content-Type: text/html');
    echo json_encode($arr);
    die();
} elseif ('login' == $task) {
    // Just to make sure that the generated hash is correct
    $PWD  = base64_decode(trim(filter_var(($data['PWD'] ?? ''), FILTER_SANITIZE_FULL_SPECIAL_CHARS)));
    $hash = base64_decode(trim(filter_var(($data['hash'] ?? ''), FILTER_SANITIZE_FULL_SPECIAL_CHARS)));

    $check = password_verify($PWD, $hash)
        ? '<span style="color:green;">(success, hash validated)</span>'
        : '<span style="color:red;font-weight:bolder;">(FAILURE, an error has occurred)</span>';

    header('Content-Type: text/html');
    echo base64_encode($check);
    die();
}

// Get the GitHub corner
$github = '';
if (is_file($cat = __DIR__ . DIRECTORY_SEPARATOR . 'octocat.tmpl')) {
    $github = str_replace('%REPO%', REPO, file_get_contents($cat));
}
?>

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="utf-8" />
    <meta name="author" content="Christophe Avonture" />
    <meta name="robots" content="noindex, nofollow" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <meta http-equiv="content-type" content="text/html; charset=UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=9; IE=8;" />
    <title>PHP - Password</title>
    <link href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" rel="stylesheet" type="text/css">
    <link href="https://cdnjs.cloudflare.com/ajax/libs/prism/1.13.0/themes/prism.min.css" rel="stylesheet" type="text/css">
    <style>
        details {
            margin: 1rem;
        }

        summary {
            font-weight: bold;
        }

        pre {
            white-space: pre-wrap;
            /* css-3 */
            white-space: -moz-pre-wrap;
            /* Mozilla, since 1999 */
            white-space: -pre-wrap;
            /* Opera 4-6 */
            white-space: -o-pre-wrap;
            /* Opera 7 */
            word-wrap: break-word;
            /* Internet Explorer 5.5+ */
        }

        #checkPwd {
            font-style: italic;
        }

        .error {
            color: red;
            font-weight: bold;
        }

        textarea {
            margin-top: 10px;
        }
    </style>
</head>

<body>
    <?php echo $github; ?>
    <div class="container">
        <div class="page-header">
            <h1>PHP Password</h1>
        </div>
        <div id="app" class="container">
            <how-to-use demo="">
                <p>Since PHP 7.x it is recommended to use the native <strong>password_hash()</strong>
                    function
                    (<a href="https://www.atyantik.com/managing-passwords-correct-way-php/" target="_blank" rel="noopener noreferrer">read more</a>).
                </p>
                <p>MD5 should be avoided since there are plenty of md5 dictionaries for helping
                    to "crack" MD5 passwords like f.i. https://crackstation.net/.</p>
                <p>Note: since password_hash() is native, therefore there are no dependencies
                    with an external library.</p>
                <div class="row">
                    <div class="col-sm">
                        <ul>
                            <li>Type (or paste) the character string in the textarea below and
                                click on the Hash button; you'll get the hash of the password.</li>
                            <li>Use the password like in the code sample that will be given.</li>
                        </ul>
                    </div>
                </div>
            </how-to-use>

            <div class="form-group">
                <label for="PWD">Enter below the character string you want to use as password:</label>
                <input type="text" @keydown="doReset" class="form-control" v-model="PWD" name="PWD" width="100"></input>
            </div>

            <button type="button" @click="getHash" class="btn btn-primary">Hash</button>

            <hr />

            <div v-if="HASH">
                <p>The hash of <strong class="password">{{ PWD }}</strong> gives
                    <strong class="hash">{{ HASH }}</strong>&nbsp;<span id="checkPwd" v-html="CHECK"></span>
                </p>

                <button class="btnClipboard d-none" data-clipboard-target=".hash">
                    Copy to clipboard
                </button>

                <hr />

                <p>Sample PHP code:</p>
                <pre><code id="PHP_Sample" class="language-php">
// 1. For instance, retrieve the password from a protected file, outside the public folder
$hash = file_get_contents('../public/site/password.json');

// $hash now contain the resulting of password_hash("your_password", PASSWORD_DEFAULT)
// For instance $hash is equal to '{{ HASH }}'

// 2. Get the filled-in password, for instance, from a submitted form
$password = filter_input(INPUT_POST, 'password', FILTER_SANITIZE_FULL_SPECIAL_CHARS);

// 3. And verify if the filled in password is the expected one
if (password_verify($password, $hash)) {
    echo 'You can enter to this room, the password is correct.';
}
                    </code></pre>
                <p>Store for instance the hash of this password in a database or any protected file
                    (best outside your public folder) and don't use anymore your password
                    in plain text but just verify the hash using <strong>password_verify()</strong>.</p>
                <p><em>Info: the hash will start with '$2y$' when the used algorithm is BCRYPT and with
                        '$argon2i$' when Argon2i was used (which is much better).</em></p>
            </div>
        </div>
    </div>
    <script src="https://unpkg.com/vue@2"></script>
    <script src="https://unpkg.com/axios/dist/axios.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/prism/1.13.0/prism.min.js"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/prism/1.13.0/components/prism-php.js"></script>

    <!-- Clipboard requires jQuery -->
    <script src="https://code.jquery.com/jquery-3.3.1.min.js" integrity="sha256-FgpCb/KJQlLNfOu91ta32o/NMZxltwRo8QtmkMRdAu8=" crossorigin="anonymous"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/clipboard.js/2.0.0/clipboard.min.js"></script>

    <script type="text/javascript">
        Vue.component('how-to-use', {
            props: {
                demo: {
                    type: String,
                    required: true
                }
            },
            template: `<details>
                        <summary>How to use?</summary>
                        <div class="row">
                            <div class="col-sm">
                                <slot></slot>
                            </div>
                            <div v-if="demo" class="col-sm"><img v-bind:src="demo" alt="Demo"></div>
                        </div>
                    </details>`
        });

        var app = new Vue({
            el: '#app',
            data: {
                PWD: 'MyPasswordIsSecret',
                HASH: '',
                CHECK: ''
            },
            methods: {
                doReset() {
                    this.HASH = '';
                    this.CHECK = '';
                },
                getHash() {
                    var $data = {
                        task: 'hash',
                        PWD: window.btoa(this.PWD)
                    }
                    axios.post('<?php echo basename(__FILE__); ?>', $data)
                        .then(response => {
                            this.HASH = window.atob(response.data.hash)

                            // Check password to make sure it was ok
                            var $data = {
                                task: 'login',
                                PWD: window.btoa(this.PWD),
                                hash: window.btoa(this.HASH)
                            }
                            axios.post('<?php echo basename(__FILE__); ?>', $data)
                                .then(response => {
                                    this.CHECK = window.atob(response.data)
                                })
                        })
                        .catch(function(error) {
                            console.log(error);
                        })
                        .then(function() {
                            if (typeof Prism === 'object') {
                                // Use prism.js and highlight source code
                                Prism.highlightAll();
                            }

                            // jQuery part, handle the Copy in the clipboard feature
                            if (typeof ClipboardJS === 'function') {
                                if (this.HASH !== '') {
                                    $('.btnClipboard').removeClass('d-none').removeAttr("disabled");
                                    var clipboard = new ClipboardJS('.btnClipboard');

                                    clipboard.on('success', function(e) {
                                        alert('Password hash copied!');
                                        e.clearSelection();
                                    });
                                }
                            };
                        });
                }
            }
        });
    </script>
</body>

</html>