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
|
<?php
/**
* HTTP Digest Authentication handler
*
* Use this class for easy http digest authentication.
* Instructions:
*
* 1. Create the object
* 2. Call the setRealm() method with the realm you plan to use
* 3. Call the init method function.
* 4. Call the getUserName() function. This function may return false if no
* authentication information was supplied. Based on the username you
* should check your internal database for either the associated password,
* or the so-called A1 hash of the digest.
* 5. Call either validatePassword() or validateA1(). This will return true
* or false.
* 6. To make sure an authentication prompt is displayed, call the
* requireLogin() method.
*
*
* @package Sabre
* @subpackage HTTP
* @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
* @author Evert Pot (http://www.rooftopsolutions.nl/)
* @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
*/
class Sabre_HTTP_DigestAuth extends Sabre_HTTP_AbstractAuth {
/**
* These constants are used in setQOP();
*/
const QOP_AUTH = 1;
const QOP_AUTHINT = 2;
protected $nonce;
protected $opaque;
protected $digestParts;
protected $A1;
protected $qop = self::QOP_AUTH;
/**
* Initializes the object
*/
public function __construct() {
$this->nonce = uniqid();
$this->opaque = md5($this->realm);
parent::__construct();
}
/**
* Gathers all information from the headers
*
* This method needs to be called prior to anything else.
*
* @return void
*/
public function init() {
$digest = $this->getDigest();
$this->digestParts = $this->parseDigest($digest);
}
/**
* Sets the quality of protection value.
*
* Possible values are:
* Sabre_HTTP_DigestAuth::QOP_AUTH
* Sabre_HTTP_DigestAuth::QOP_AUTHINT
*
* Multiple values can be specified using logical OR.
*
* QOP_AUTHINT ensures integrity of the request body, but this is not
* supported by most HTTP clients. QOP_AUTHINT also requires the entire
* request body to be md5'ed, which can put strains on CPU and memory.
*
* @param int $qop
* @return void
*/
public function setQOP($qop) {
$this->qop = $qop;
}
/**
* Validates the user.
*
* The A1 parameter should be md5($username . ':' . $realm . ':' . $password);
*
* @param string $A1
* @return bool
*/
public function validateA1($A1) {
$this->A1 = $A1;
return $this->validate();
}
/**
* Validates authentication through a password. The actual password must be provided here.
* It is strongly recommended not store the password in plain-text and use validateA1 instead.
*
* @param string $password
* @return bool
*/
public function validatePassword($password) {
$this->A1 = md5($this->digestParts['username'] . ':' . $this->realm . ':' . $password);
return $this->validate();
}
/**
* Returns the username for the request
*
* @return string
*/
public function getUsername() {
return $this->digestParts['username'];
}
/**
* Validates the digest challenge
*
* @return bool
*/
protected function validate() {
$A2 = $this->httpRequest->getMethod() . ':' . $this->digestParts['uri'];
if ($this->digestParts['qop']=='auth-int') {
// Making sure we support this qop value
if (!($this->qop & self::QOP_AUTHINT)) return false;
// We need to add an md5 of the entire request body to the A2 part of the hash
$body = $this->httpRequest->getBody(true);
$this->httpRequest->setBody($body,true);
$A2 .= ':' . md5($body);
} else {
// We need to make sure we support this qop value
if (!($this->qop & self::QOP_AUTH)) return false;
}
$A2 = md5($A2);
$validResponse = md5("{$this->A1}:{$this->digestParts['nonce']}:{$this->digestParts['nc']}:{$this->digestParts['cnonce']}:{$this->digestParts['qop']}:{$A2}");
return $this->digestParts['response']==$validResponse;
}
/**
* Returns an HTTP 401 header, forcing login
*
* This should be called when username and password are incorrect, or not supplied at all
*
* @return void
*/
public function requireLogin() {
$qop = '';
switch($this->qop) {
case self::QOP_AUTH : $qop = 'auth'; break;
case self::QOP_AUTHINT : $qop = 'auth-int'; break;
case self::QOP_AUTH | self::QOP_AUTHINT : $qop = 'auth,auth-int'; break;
}
$this->httpResponse->setHeader('WWW-Authenticate','Digest realm="' . $this->realm . '",qop="'.$qop.'",nonce="' . $this->nonce . '",opaque="' . $this->opaque . '"');
$this->httpResponse->sendStatus(401);
}
/**
* This method returns the full digest string.
*
* It should be compatibile with mod_php format and other webservers.
*
* If the header could not be found, null will be returned
*
* @return mixed
*/
public function getDigest() {
// mod_php
$digest = $this->httpRequest->getRawServerValue('PHP_AUTH_DIGEST');
if ($digest) return $digest;
// most other servers
$digest = $this->httpRequest->getHeader('Authorization');
// Apache could prefix environment variables with REDIRECT_ when urls
// are passed through mod_rewrite
if (!$digest) {
$digest = $this->httpRequest->getRawServerValue('REDIRECT_HTTP_AUTHORIZATION');
}
if ($digest && strpos(strtolower($digest),'digest')===0) {
return substr($digest,7);
} else {
return null;
}
}
/**
* Parses the different pieces of the digest string into an array.
*
* This method returns false if an incomplete digest was supplied
*
* @param string $digest
* @return mixed
*/
protected function parseDigest($digest) {
// protect against missing data
$needed_parts = array('nonce'=>1, 'nc'=>1, 'cnonce'=>1, 'qop'=>1, 'username'=>1, 'uri'=>1, 'response'=>1);
$data = array();
preg_match_all('@(\w+)=(?:(?:")([^"]+)"|([^\s,$]+))@', $digest, $matches, PREG_SET_ORDER);
foreach ($matches as $m) {
$data[$m[1]] = $m[2] ? $m[2] : $m[3];
unset($needed_parts[$m[1]]);
}
return $needed_parts ? false : $data;
}
}
|
