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
|
<?php
declare(strict_types=1);
namespace SimpleSAML\Module\saml\Auth\Process;
use SimpleSAML\Auth;
use SimpleSAML\Error;
use SimpleSAML\Logger;
use SimpleSAML\Module;
use SimpleSAML\Utils;
/**
* Attribute filter to validate AuthnContextClassRef values.
*
* Example configuration:
*
* 91 => array(
* 'class' => 'saml:ExpectedAuthnContextClassRef',
* 'accepted' => array(
* 'urn:oasis:names:tc:SAML:2.0:post:ac:classes:nist-800-63:3',
* 'urn:oasis:names:tc:SAML:2.0:ac:classes:Password',
* ),
* ),
*
* @package SimpleSAMLphp
*/
class ExpectedAuthnContextClassRef extends \SimpleSAML\Auth\ProcessingFilter
{
/**
* Array of accepted AuthnContextClassRef
* @var array
*/
private $accepted;
/**
* AuthnContextClassRef of the assertion
* @var string|null
*/
private $AuthnContextClassRef = null;
/**
* Initialize this filter, parse configuration
*
* @param array $config Configuration information about this filter.
* @param mixed $reserved For future use.
*
* @throws \SimpleSAML\Error\Exception if the mandatory 'accepted' configuration option is missing.
*/
public function __construct($config, $reserved)
{
parent::__construct($config, $reserved);
assert(is_array($config));
if (empty($config['accepted'])) {
Logger::error(
'ExpectedAuthnContextClassRef: Configuration error. There is no accepted AuthnContextClassRef.'
);
throw new Error\Exception(
'ExpectedAuthnContextClassRef: Configuration error. There is no accepted AuthnContextClassRef.'
);
}
$this->accepted = $config['accepted'];
}
/**
*
* @param array &$request The current request
* @return void
*/
public function process(&$request)
{
assert(is_array($request));
assert(array_key_exists('saml:sp:State', $request));
$this->AuthnContextClassRef = $request['saml:sp:State']['saml:sp:AuthnContext'];
if (!in_array($this->AuthnContextClassRef, $this->accepted, true)) {
$this->unauthorized($request);
}
}
/**
* When the process logic determines that the user is not
* authorized for this service, then forward the user to
* an 403 unauthorized page.
*
* Separated this code into its own method so that child
* classes can override it and change the action. Forward
* thinking in case a "chained" ACL is needed, more complex
* permission logic.
*
* @param array $request
* @return void
*/
protected function unauthorized(&$request)
{
Logger::error(
'ExpectedAuthnContextClassRef: Invalid authentication context: ' . strval($this->AuthnContextClassRef) .
'. Accepted values are: ' . var_export($this->accepted, true)
);
$id = Auth\State::saveState($request, 'saml:ExpectedAuthnContextClassRef:unauthorized');
$url = Module::getModuleURL(
'saml/sp/wrong_authncontextclassref.php'
);
Utils\HTTP::redirectTrustedURL($url, ['StateId' => $id]);
}
}
|
