/
owncloud_3rdparty_Sabre_HTTP_AWSAuth.php
226 lines (178 loc) · 5.75 KB
/
owncloud_3rdparty_Sabre_HTTP_AWSAuth.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
<?php
/**
* HTTP AWS Authentication handler
*
* Use this class to leverage amazon's AWS authentication header
*
* @package Sabre
* @subpackage HTTP
* @copyright Copyright (C) 2007-2011 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_AWSAuth extends Sabre_HTTP_AbstractAuth {
/**
* The signature supplied by the HTTP client
*
* @var string
*/
private $signature = null;
/**
* The accesskey supplied by the HTTP client
*
* @var string
*/
private $accessKey = null;
/**
* An error code, if any
*
* This value will be filled with one of the ERR_* contants
*
* @var int
*/
public $errorCode = 0;
const ERR_NOAWSHEADER = 1;
const ERR_MD5CHECKSUMWRONG = 2;
const ERR_INVALIDDATEFORMAT = 3;
const ERR_REQUESTTIMESKEWED = 4;
const ERR_INVALIDSIGNATURE = 5;
/**
* Gathers all information from the headers
*
* This method needs to be called prior to anything else.
*
* @return bool
*/
public function init() {
$authHeader = $this->httpRequest->getHeader('Authorization');
$authHeader = explode(' ',$authHeader);
if ($authHeader[0]!='AWS' || !isset($authHeader[1])) {
$this->errorCode = self::ERR_NOAWSHEADER;
return false;
}
list($this->accessKey,$this->signature) = explode(':',$authHeader[1]);
return true;
}
/**
* Returns the username for the request
*
* @return string
*/
public function getAccessKey() {
return $this->accessKey;
}
/**
* Validates the signature based on the secretKey
*
* @return bool
*/
public function validate($secretKey) {
$contentMD5 = $this->httpRequest->getHeader('Content-MD5');
if ($contentMD5) {
// We need to validate the integrity of the request
$body = $this->httpRequest->getBody(true);
$this->httpRequest->setBody($body,true);
if ($contentMD5!=base64_encode(md5($body,true))) {
// content-md5 header did not match md5 signature of body
$this->errorCode = self::ERR_MD5CHECKSUMWRONG;
return false;
}
}
if (!$requestDate = $this->httpRequest->getHeader('x-amz-date'))
$requestDate = $this->httpRequest->getHeader('Date');
if (!$this->validateRFC2616Date($requestDate))
return false;
$amzHeaders = $this->getAmzHeaders();
$signature = base64_encode(
$this->hmacsha1($secretKey,
$this->httpRequest->getMethod() . "\n" .
$contentMD5 . "\n" .
$this->httpRequest->getHeader('Content-type') . "\n" .
$requestDate . "\n" .
$amzHeaders .
$this->httpRequest->getURI()
)
);
if ($this->signature != $signature) {
$this->errorCode = self::ERR_INVALIDSIGNATURE;
return false;
}
return true;
}
/**
* 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() {
$this->httpResponse->setHeader('WWW-Authenticate','AWS');
$this->httpResponse->sendStatus(401);
}
/**
* Makes sure the supplied value is a valid RFC2616 date.
*
* If we would just use strtotime to get a valid timestamp, we have no way of checking if a
* user just supplied the word 'now' for the date header.
*
* This function also makes sure the Date header is within 15 minutes of the operating
* system date, to prevent replay attacks.
*
* @param string $dateHeader
* @return bool
*/
protected function validateRFC2616Date($dateHeader) {
$date = Sabre_HTTP_Util::parseHTTPDate($dateHeader);
// Unknown format
if (!$date) {
$this->errorCode = self::ERR_INVALIDDATEFORMAT;
return false;
}
$min = new DateTime('-15 minutes');
$max = new DateTime('+15 minutes');
// We allow 15 minutes around the current date/time
if ($date > $max || $date < $min) {
$this->errorCode = self::ERR_REQUESTTIMESKEWED;
return false;
}
return $date;
}
/**
* Returns a list of AMZ headers
*
* @return void
*/
protected function getAmzHeaders() {
$amzHeaders = array();
$headers = $this->httpRequest->getHeaders();
foreach($headers as $headerName => $headerValue) {
if (strpos(strtolower($headerName),'x-amz-')===0) {
$amzHeaders[strtolower($headerName)] = str_replace(array("\r\n"),array(' '),$headerValue) . "\n";
}
}
ksort($amzHeaders);
$headerStr = '';
foreach($amzHeaders as $h=>$v) {
$headerStr.=$h.':'.$v;
}
return $headerStr;
}
/**
* Generates an HMAC-SHA1 signature
*
* @param string $key
* @param string $message
* @return string
*/
private function hmacsha1($key, $message) {
$blocksize=64;
if (strlen($key)>$blocksize)
$key=pack('H*', sha1($key));
$key=str_pad($key,$blocksize,chr(0x00));
$ipad=str_repeat(chr(0x36),$blocksize);
$opad=str_repeat(chr(0x5c),$blocksize);
$hmac = pack('H*',sha1(($key^$opad).pack('H*',sha1(($key^$ipad).$message))));
return $hmac;
}
}