php authentication

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12 Feb 2020

1
2<?php
3$realm = 'Restricted area';
4
5//user => password
6$users = array('admin' => 'mypass', 'guest' => 'guest');
7
8
9if (empty($_SERVER['PHP_AUTH_DIGEST'])) {
10    header('HTTP/1.1 401 Unauthorized');
11    header('WWW-Authenticate: Digest realm="'.$realm.
12           '",qop="auth",nonce="'.uniqid().'",opaque="'.md5($realm).'"');
13
14    die('Text to send if user hits Cancel button');
15}
16
17
18// analyze the PHP_AUTH_DIGEST variable
19if (!($data = http_digest_parse($_SERVER['PHP_AUTH_DIGEST'])) ||
20    !isset($users[$data['username']]))
21    die('Wrong Credentials!');
22
23
24// generate the valid response
25$A1 = md5($data['username'] . ':' . $realm . ':' . $users[$data['username']]);
26$A2 = md5($_SERVER['REQUEST_METHOD'].':'.$data['uri']);
27$valid_response = md5($A1.':'.$data['nonce'].':'.$data['nc'].':'.$data['cnonce'].':'.$data['qop'].':'.$A2);
28
29if ($data['response'] != $valid_response)
30    die('Wrong Credentials!');
31
32// ok, valid username & password
33echo 'You are logged in as: ' . $data['username'];
34
35
36// function to parse the http auth header
37function http_digest_parse($txt)
38{
39    // protect against missing data
40    $needed_parts = array('nonce'=>1, 'nc'=>1, 'cnonce'=>1, 'qop'=>1, 'username'=>1, 'uri'=>1, 'response'=>1);
41    $data = array();
42    $keys = implode('|', array_keys($needed_parts));
43
44    preg_match_all('@(' . $keys . ')=(?:([\'"])([^\2]+?)\2|([^\s,]+))@', $txt, $matches, PREG_SET_ORDER);
45
46    foreach ($matches as $m) {
47        $data[$m[1]] = $m[3] ? $m[3] : $m[4];
48        unset($needed_parts[$m[1]]);
49    }
50
51    return $needed_parts ? false : $data;
52}
53?>
54
55

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