This file is indexed.

/usr/share/php/Auth/OpenID/Association.php is in php-openid 2.2.2-1.2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  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
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
<?php

/**
 * This module contains code for dealing with associations between
 * consumers and servers.
 *
 * PHP versions 4 and 5
 *
 * LICENSE: See the COPYING file included in this distribution.
 *
 * @package OpenID
 * @author JanRain, Inc. <openid@janrain.com>
 * @copyright 2005-2008 Janrain, Inc.
 * @license http://www.apache.org/licenses/LICENSE-2.0 Apache
 */

/**
 * @access private
 */
require_once 'Auth/OpenID/CryptUtil.php';

/**
 * @access private
 */
require_once 'Auth/OpenID/KVForm.php';

/**
 * @access private
 */
require_once 'Auth/OpenID/HMAC.php';

/**
 * This class represents an association between a server and a
 * consumer.  In general, users of this library will never see
 * instances of this object.  The only exception is if you implement a
 * custom {@link Auth_OpenID_OpenIDStore}.
 *
 * If you do implement such a store, it will need to store the values
 * of the handle, secret, issued, lifetime, and assoc_type instance
 * variables.
 *
 * @package OpenID
 */
class Auth_OpenID_Association {

    /**
     * This is a HMAC-SHA1 specific value.
     *
     * @access private
     */
    var $SIG_LENGTH = 20;

    /**
     * The ordering and name of keys as stored by serialize.
     *
     * @access private
     */
    var $assoc_keys = array(
                            'version',
                            'handle',
                            'secret',
                            'issued',
                            'lifetime',
                            'assoc_type'
                            );

    var $_macs = array(
                       'HMAC-SHA1' => 'Auth_OpenID_HMACSHA1',
                       'HMAC-SHA256' => 'Auth_OpenID_HMACSHA256'
                       );

    /**
     * This is an alternate constructor (factory method) used by the
     * OpenID consumer library to create associations.  OpenID store
     * implementations shouldn't use this constructor.
     *
     * @access private
     *
     * @param integer $expires_in This is the amount of time this
     * association is good for, measured in seconds since the
     * association was issued.
     *
     * @param string $handle This is the handle the server gave this
     * association.
     *
     * @param string secret This is the shared secret the server
     * generated for this association.
     *
     * @param assoc_type This is the type of association this
     * instance represents.  The only valid values of this field at
     * this time is 'HMAC-SHA1' and 'HMAC-SHA256', but new types may
     * be defined in the future.
     *
     * @return association An {@link Auth_OpenID_Association}
     * instance.
     */
    static function fromExpiresIn($expires_in, $handle, $secret, $assoc_type)
    {
        $issued = time();
        $lifetime = $expires_in;
        return new Auth_OpenID_Association($handle, $secret,
                                           $issued, $lifetime, $assoc_type);
    }

    /**
     * This is the standard constructor for creating an association.
     * The library should create all of the necessary associations, so
     * this constructor is not part of the external API.
     *
     * @access private
     *
     * @param string $handle This is the handle the server gave this
     * association.
     *
     * @param string $secret This is the shared secret the server
     * generated for this association.
     *
     * @param integer $issued This is the time this association was
     * issued, in seconds since 00:00 GMT, January 1, 1970.  (ie, a
     * unix timestamp)
     *
     * @param integer $lifetime This is the amount of time this
     * association is good for, measured in seconds since the
     * association was issued.
     *
     * @param string $assoc_type This is the type of association this
     * instance represents.  The only valid values of this field at
     * this time is 'HMAC-SHA1' and 'HMAC-SHA256', but new types may
     * be defined in the future.
     */
    function Auth_OpenID_Association(
        $handle, $secret, $issued, $lifetime, $assoc_type)
    {
        if (!in_array($assoc_type,
                      Auth_OpenID_getSupportedAssociationTypes(), true)) {
            $fmt = 'Unsupported association type (%s)';
            trigger_error(sprintf($fmt, $assoc_type), E_USER_ERROR);
        }

        $this->handle = $handle;
        $this->secret = $secret;
        $this->issued = $issued;
        $this->lifetime = $lifetime;
        $this->assoc_type = $assoc_type;
    }

    /**
     * This returns the number of seconds this association is still
     * valid for, or 0 if the association is no longer valid.
     *
     * @return integer $seconds The number of seconds this association
     * is still valid for, or 0 if the association is no longer valid.
     */
    function getExpiresIn($now = null)
    {
        if ($now == null) {
            $now = time();
        }

        return max(0, $this->issued + $this->lifetime - $now);
    }

    /**
     * This checks to see if two {@link Auth_OpenID_Association}
     * instances represent the same association.
     *
     * @return bool $result true if the two instances represent the
     * same association, false otherwise.
     */
    function equal($other)
    {
        return ((gettype($this) == gettype($other))
                && ($this->handle == $other->handle)
                && ($this->secret == $other->secret)
                && ($this->issued == $other->issued)
                && ($this->lifetime == $other->lifetime)
                && ($this->assoc_type == $other->assoc_type));
    }

    /**
     * Convert an association to KV form.
     *
     * @return string $result String in KV form suitable for
     * deserialization by deserialize.
     */
    function serialize()
    {
        $data = array(
                     'version' => '2',
                     'handle' => $this->handle,
                     'secret' => base64_encode($this->secret),
                     'issued' => strval(intval($this->issued)),
                     'lifetime' => strval(intval($this->lifetime)),
                     'assoc_type' => $this->assoc_type
                     );

        assert(array_keys($data) == $this->assoc_keys);

        return Auth_OpenID_KVForm::fromArray($data, $strict = true);
    }

    /**
     * Parse an association as stored by serialize().  This is the
     * inverse of serialize.
     *
     * @param string $assoc_s Association as serialized by serialize()
     * @return Auth_OpenID_Association $result instance of this class
     */
    static function deserialize($class_name, $assoc_s)
    {
        $pairs = Auth_OpenID_KVForm::toArray($assoc_s, $strict = true);
        $keys = array();
        $values = array();
        foreach ($pairs as $key => $value) {
            if (is_array($value)) {
                list($key, $value) = $value;
            }
            $keys[] = $key;
            $values[] = $value;
        }

        $class_vars = get_class_vars($class_name);
        $class_assoc_keys = $class_vars['assoc_keys'];

        sort($keys);
        sort($class_assoc_keys);

        if ($keys != $class_assoc_keys) {
            trigger_error('Unexpected key values: ' . var_export($keys, true),
                          E_USER_WARNING);
            return null;
        }

        $version = $pairs['version'];
        $handle = $pairs['handle'];
        $secret = $pairs['secret'];
        $issued = $pairs['issued'];
        $lifetime = $pairs['lifetime'];
        $assoc_type = $pairs['assoc_type'];

        if ($version != '2') {
            trigger_error('Unknown version: ' . $version, E_USER_WARNING);
            return null;
        }

        $issued = intval($issued);
        $lifetime = intval($lifetime);
        $secret = base64_decode($secret);

        return new $class_name(
            $handle, $secret, $issued, $lifetime, $assoc_type);
    }

    /**
     * Generate a signature for a sequence of (key, value) pairs
     *
     * @access private
     * @param array $pairs The pairs to sign, in order.  This is an
     * array of two-tuples.
     * @return string $signature The binary signature of this sequence
     * of pairs
     */
    function sign($pairs)
    {
        $kv = Auth_OpenID_KVForm::fromArray($pairs);

        /* Invalid association types should be caught at constructor */
        $callback = $this->_macs[$this->assoc_type];

        return call_user_func_array($callback, array($this->secret, $kv));
    }

    /**
     * Generate a signature for some fields in a dictionary
     *
     * @access private
     * @param array $fields The fields to sign, in order; this is an
     * array of strings.
     * @param array $data Dictionary of values to sign (an array of
     * string => string pairs).
     * @return string $signature The signature, base64 encoded
     */
    function signMessage($message)
    {
        if ($message->hasKey(Auth_OpenID_OPENID_NS, 'sig') ||
            $message->hasKey(Auth_OpenID_OPENID_NS, 'signed')) {
            // Already has a sig
            return null;
        }

        $extant_handle = $message->getArg(Auth_OpenID_OPENID_NS,
                                          'assoc_handle');

        if ($extant_handle && ($extant_handle != $this->handle)) {
            // raise ValueError("Message has a different association handle")
            return null;
        }

        $signed_message = $message;
        $signed_message->setArg(Auth_OpenID_OPENID_NS, 'assoc_handle',
                                $this->handle);

        $message_keys = array_keys($signed_message->toPostArgs());
        $signed_list = array();
        $signed_prefix = 'openid.';

        foreach ($message_keys as $k) {
            if (strpos($k, $signed_prefix) === 0) {
                $signed_list[] = substr($k, strlen($signed_prefix));
            }
        }

        $signed_list[] = 'signed';
        sort($signed_list);

        $signed_message->setArg(Auth_OpenID_OPENID_NS, 'signed',
                                implode(',', $signed_list));
        $sig = $this->getMessageSignature($signed_message);
        $signed_message->setArg(Auth_OpenID_OPENID_NS, 'sig', $sig);
        return $signed_message;
    }

    /**
     * Given a {@link Auth_OpenID_Message}, return the key/value pairs
     * to be signed according to the signed list in the message.  If
     * the message lacks a signed list, return null.
     *
     * @access private
     */
    function _makePairs($message)
    {
        $signed = $message->getArg(Auth_OpenID_OPENID_NS, 'signed');
        if (!$signed || Auth_OpenID::isFailure($signed)) {
            // raise ValueError('Message has no signed list: %s' % (message,))
            return null;
        }

        $signed_list = explode(',', $signed);
        $pairs = array();
        $data = $message->toPostArgs();
        foreach ($signed_list as $field) {
            $pairs[] = array($field, Auth_OpenID::arrayGet($data,
                                                           'openid.' .
                                                           $field, ''));
        }
        return $pairs;
    }

    /**
     * Given an {@link Auth_OpenID_Message}, return the signature for
     * the signed list in the message.
     *
     * @access private
     */
    function getMessageSignature($message)
    {
        $pairs = $this->_makePairs($message);
        return base64_encode($this->sign($pairs));
    }

    /**
     * Confirm that the signature of these fields matches the
     * signature contained in the data.
     *
     * @access private
     */
    function checkMessageSignature($message)
    {
        $sig = $message->getArg(Auth_OpenID_OPENID_NS,
                                'sig');

        if (!$sig || Auth_OpenID::isFailure($sig)) {
            return false;
        }

        $calculated_sig = $this->getMessageSignature($message);
        return $calculated_sig == $sig;
    }
}

function Auth_OpenID_getSecretSize($assoc_type)
{
    if ($assoc_type == 'HMAC-SHA1') {
        return 20;
    } else if ($assoc_type == 'HMAC-SHA256') {
        return 32;
    } else {
        return null;
    }
}

function Auth_OpenID_getAllAssociationTypes()
{
    return array('HMAC-SHA1', 'HMAC-SHA256');
}

function Auth_OpenID_getSupportedAssociationTypes()
{
    $a = array('HMAC-SHA1');

    if (Auth_OpenID_HMACSHA256_SUPPORTED) {
        $a[] = 'HMAC-SHA256';
    }

    return $a;
}

function Auth_OpenID_getSessionTypes($assoc_type)
{
    $assoc_to_session = array(
       'HMAC-SHA1' => array('DH-SHA1', 'no-encryption'));

    if (Auth_OpenID_HMACSHA256_SUPPORTED) {
        $assoc_to_session['HMAC-SHA256'] =
            array('DH-SHA256', 'no-encryption');
    }

    return Auth_OpenID::arrayGet($assoc_to_session, $assoc_type, array());
}

function Auth_OpenID_checkSessionType($assoc_type, $session_type)
{
    if (!in_array($session_type,
                  Auth_OpenID_getSessionTypes($assoc_type))) {
        return false;
    }

    return true;
}

function Auth_OpenID_getDefaultAssociationOrder()
{
    $order = array();

    if (!Auth_OpenID_noMathSupport()) {
        $order[] = array('HMAC-SHA1', 'DH-SHA1');

        if (Auth_OpenID_HMACSHA256_SUPPORTED) {
            $order[] = array('HMAC-SHA256', 'DH-SHA256');
        }
    }

    $order[] = array('HMAC-SHA1', 'no-encryption');

    if (Auth_OpenID_HMACSHA256_SUPPORTED) {
        $order[] = array('HMAC-SHA256', 'no-encryption');
    }

    return $order;
}

function Auth_OpenID_getOnlyEncryptedOrder()
{
    $result = array();

    foreach (Auth_OpenID_getDefaultAssociationOrder() as $pair) {
        list($assoc, $session) = $pair;

        if ($session != 'no-encryption') {
            if (Auth_OpenID_HMACSHA256_SUPPORTED &&
                ($assoc == 'HMAC-SHA256')) {
                $result[] = $pair;
            } else if ($assoc != 'HMAC-SHA256') {
                $result[] = $pair;
            }
        }
    }

    return $result;
}

function Auth_OpenID_getDefaultNegotiator()
{
    return new Auth_OpenID_SessionNegotiator(
                 Auth_OpenID_getDefaultAssociationOrder());
}

function Auth_OpenID_getEncryptedNegotiator()
{
    return new Auth_OpenID_SessionNegotiator(
                 Auth_OpenID_getOnlyEncryptedOrder());
}

/**
 * A session negotiator controls the allowed and preferred association
 * types and association session types. Both the {@link
 * Auth_OpenID_Consumer} and {@link Auth_OpenID_Server} use
 * negotiators when creating associations.
 *
 * You can create and use negotiators if you:

 * - Do not want to do Diffie-Hellman key exchange because you use
 * transport-layer encryption (e.g. SSL)
 *
 * - Want to use only SHA-256 associations
 *
 * - Do not want to support plain-text associations over a non-secure
 * channel
 *
 * It is up to you to set a policy for what kinds of associations to
 * accept. By default, the library will make any kind of association
 * that is allowed in the OpenID 2.0 specification.
 *
 * Use of negotiators in the library
 * =================================
 *
 * When a consumer makes an association request, it calls {@link
 * getAllowedType} to get the preferred association type and
 * association session type.
 *
 * The server gets a request for a particular association/session type
 * and calls {@link isAllowed} to determine if it should create an
 * association. If it is supported, negotiation is complete. If it is
 * not, the server calls {@link getAllowedType} to get an allowed
 * association type to return to the consumer.
 *
 * If the consumer gets an error response indicating that the
 * requested association/session type is not supported by the server
 * that contains an assocation/session type to try, it calls {@link
 * isAllowed} to determine if it should try again with the given
 * combination of association/session type.
 *
 * @package OpenID
 */
class Auth_OpenID_SessionNegotiator {
    function Auth_OpenID_SessionNegotiator($allowed_types)
    {
        $this->allowed_types = array();
        $this->setAllowedTypes($allowed_types);
    }

    /**
     * Set the allowed association types, checking to make sure each
     * combination is valid.
     *
     * @access private
     */
    function setAllowedTypes($allowed_types)
    {
        foreach ($allowed_types as $pair) {
            list($assoc_type, $session_type) = $pair;
            if (!Auth_OpenID_checkSessionType($assoc_type, $session_type)) {
                return false;
            }
        }

        $this->allowed_types = $allowed_types;
        return true;
    }

    /**
     * Add an association type and session type to the allowed types
     * list. The assocation/session pairs are tried in the order that
     * they are added.
     *
     * @access private
     */
    function addAllowedType($assoc_type, $session_type = null)
    {
        if ($this->allowed_types === null) {
            $this->allowed_types = array();
        }

        if ($session_type === null) {
            $available = Auth_OpenID_getSessionTypes($assoc_type);

            if (!$available) {
                return false;
            }

            foreach ($available as $session_type) {
                $this->addAllowedType($assoc_type, $session_type);
            }
        } else {
            if (Auth_OpenID_checkSessionType($assoc_type, $session_type)) {
                $this->allowed_types[] = array($assoc_type, $session_type);
            } else {
                return false;
            }
        }

        return true;
    }

    // Is this combination of association type and session type allowed?
    function isAllowed($assoc_type, $session_type)
    {
        $assoc_good = in_array(array($assoc_type, $session_type),
                               $this->allowed_types);

        $matches = in_array($session_type,
                            Auth_OpenID_getSessionTypes($assoc_type));

        return ($assoc_good && $matches);
    }

    /**
     * Get a pair of assocation type and session type that are
     * supported.
     */
    function getAllowedType()
    {
        if (!$this->allowed_types) {
            return array(null, null);
        }

        return $this->allowed_types[0];
    }
}