/
DigestAuthenticate.php
264 lines (249 loc) · 8.61 KB
/
DigestAuthenticate.php
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
<?php
/**
* PHP 5
*
* CakePHP(tm) : Rapid Development Framework (http://cakephp.org)
* Copyright 2005-2011, Cake Software Foundation, Inc. (http://cakefoundation.org)
*
* Licensed under The MIT License
* Redistributions of files must retain the above copyright notice.
*
* @copyright Copyright 2005-2011, Cake Software Foundation, Inc. (http://cakefoundation.org)
* @link http://cakephp.org CakePHP(tm) Project
* @license MIT License (http://www.opensource.org/licenses/mit-license.php)
*/
App::uses('BaseAuthenticate', 'Controller/Component/Auth');
/**
* Digest Authentication adapter for AuthComponent.
*
* Provides Digest HTTP authentication support for AuthComponent. Unlike most AuthComponent adapters,
* DigestAuthenticate requires a special password hash that conforms to RFC2617. You can create this
* password using `DigestAuthenticate::password()`. If you wish to use digest authentication alongside other
* authentication methods, its recommended that you store the digest authentication separately.
*
* Clients using Digest Authentication must support cookies. Since AuthComponent identifies users based
* on Session contents, clients without support for cookies will not function properly.
*
* ### Using Digest auth
*
* In your controller's components array, add auth + the required settings.
* {{{
* public $components = array(
* 'Auth' => array(
* 'authenticate' => array('Digest')
* )
* );
* }}}
*
* In your login function just call `$this->Auth->login()` without any checks for POST data. This
* will send the authentication headers, and trigger the login dialog in the browser/client.
*
* ### Generating passwords compatible with Digest authentication.
*
* Due to the Digest authentication specification, digest auth requires a special password value. You
* can generate this password using `DigestAuthenticate::password()`
*
* `$digestPass = DigestAuthenticate::password($username, env('SERVER_NAME'), $password);`
*
* Its recommended that you store this digest auth only password separate from password hashes used for other
* login methods. For example `User.digest_pass` could be used for a digest password, while `User.password` would
* store the password hash for use with other methods like Basic or Form.
*
* @package Cake.Controller.Component.Auth
* @since 2.0
*/
class DigestAuthenticate extends BaseAuthenticate {
/**
* Settings for this object.
*
* - `fields` The fields to use to identify a user by.
* - `userModel` The model name of the User, defaults to User.
* - `scope` Additional conditions to use when looking up and authenticating users,
* i.e. `array('User.is_active' => 1).`
* - `realm` The realm authentication is for, Defaults to the servername.
* - `nonce` A nonce used for authentication. Defaults to `uniqid()`.
* - `qop` Defaults to auth, no other values are supported at this time.
* - `opaque` A string that must be returned unchanged by clients. Defaults to `md5($settings['realm'])`
*
* @var array
*/
public $settings = array(
'fields' => array(
'username' => 'username',
'password' => 'password'
),
'userModel' => 'User',
'scope' => array(),
'realm' => '',
'qop' => 'auth',
'nonce' => '',
'opaque' => ''
);
/**
* Constructor, completes configuration for digest authentication.
*
* @param ComponentCollection $collection The Component collection used on this request.
* @param array $settings An array of settings.
*/
public function __construct(ComponentCollection $collection, $settings) {
parent::__construct($collection, $settings);
if (empty($this->settings['realm'])) {
$this->settings['realm'] = env('SERVER_NAME');
}
if (empty($this->settings['nonce'])) {
$this->settings['nonce'] = uniqid('');
}
if (empty($this->settings['opaque'])) {
$this->settings['opaque'] = md5($this->settings['realm']);
}
}
/**
* Authenticate a user using Digest HTTP auth. Will use the configured User model and attempt a
* login using Digest HTTP auth.
*
* @param CakeRequest $request The request to authenticate with.
* @param CakeResponse $response The response to add headers to.
* @return mixed Either false on failure, or an array of user data on success.
*/
public function authenticate(CakeRequest $request, CakeResponse $response) {
$user = $this->getUser($request);
if (empty($user)) {
$response->header($this->loginHeaders());
$response->statusCode(401);
$response->send();
return false;
}
return $user;
}
/**
* Get a user based on information in the request. Used by cookie-less auth for stateless clients.
*
* @param CakeRequest $request Request object.
* @return mixed Either false or an array of user information
*/
public function getUser($request) {
$digest = $this->_getDigest();
if (empty($digest)) {
return false;
}
$user = $this->_findUser($digest['username'], null);
if (empty($user)) {
return false;
}
$password = $user[$this->settings['fields']['password']];
unset($user[$this->settings['fields']['password']]);
if ($digest['response'] === $this->generateResponseHash($digest, $password)) {
return $user;
}
return false;
}
/**
* Find a user record using the standard options.
*
* @param string $username The username/identifier.
* @param string $password Unused password, digest doesn't require passwords.
* @return Mixed Either false on failure, or an array of user data.
*/
protected function _findUser($username, $password) {
$userModel = $this->settings['userModel'];
list($plugin, $model) = pluginSplit($userModel);
$fields = $this->settings['fields'];
$conditions = array(
$model . '.' . $fields['username'] => $username,
);
if (!empty($this->settings['scope'])) {
$conditions = array_merge($conditions, $this->settings['scope']);
}
$result = ClassRegistry::init($userModel)->find('first', array(
'conditions' => $conditions,
'recursive' => 0
));
if (empty($result) || empty($result[$model])) {
return false;
}
return $result[$model];
}
/**
* Gets the digest headers from the request/environment.
*
* @return array Array of digest information.
*/
protected function _getDigest() {
$digest = env('PHP_AUTH_DIGEST');
if (empty($digest) && function_exists('apache_request_headers')) {
$headers = apache_request_headers();
if (!empty($headers['Authorization']) && substr($headers['Authorization'], 0, 7) == 'Digest ') {
$digest = substr($headers['Authorization'], 7);
}
}
if (empty($digest)) {
return false;
}
return $this->parseAuthData($digest);
}
/**
* Parse the digest authentication headers and split them up.
*
* @param string $digest The raw digest authentication headers.
* @return array An array of digest authentication headers
*/
public function parseAuthData($digest) {
if (substr($digest, 0, 7) == 'Digest ') {
$digest = substr($digest, 7);
}
$keys = $match = array();
$req = array('nonce' => 1, 'nc' => 1, 'cnonce' => 1, 'qop' => 1, 'username' => 1, 'uri' => 1, 'response' => 1);
preg_match_all('/(\w+)=([\'"]?)([a-zA-Z0-9@=.\/_-]+)\2/', $digest, $match, PREG_SET_ORDER);
foreach ($match as $i) {
$keys[$i[1]] = $i[3];
unset($req[$i[1]]);
}
if (empty($req)) {
return $keys;
}
return null;
}
/**
* Generate the response hash for a given digest array.
*
* @param array $digest Digest information containing data from DigestAuthenticate::parseAuthData().
* @param string $password The digest hash password generated with DigestAuthenticate::password()
* @return string Response hash
*/
public function generateResponseHash($digest, $password) {
return md5(
$password .
':' . $digest['nonce'] . ':' . $digest['nc'] . ':' . $digest['cnonce'] . ':' . $digest['qop'] . ':' .
md5(env('REQUEST_METHOD') . ':' . $digest['uri'])
);
}
/**
* Creates an auth digest password hash to store
*
* @param string $username The username to use in the digest hash.
* @param string $password The unhashed password to make a digest hash for.
* @param string $realm The realm the password is for.
* @return string the hashed password that can later be used with Digest authentication.
*/
public static function password($username, $password, $realm) {
return md5($username . ':' . $realm . ':' . $password);
}
/**
* Generate the login headers
*
* @return string Headers for logging in.
*/
public function loginHeaders() {
$options = array(
'realm' => $this->settings['realm'],
'qop' => $this->settings['qop'],
'nonce' => $this->settings['nonce'],
'opaque' => $this->settings['opaque']
);
$opts = array();
foreach ($options as $k => $v) {
$opts[] = sprintf('%s="%s"', $k, $v);
}
return 'WWW-Authenticate: Digest ' . implode(',', $opts);
}
}