This file is indexed.

/usr/share/php/Auth/OpenID/TrustRoot.php is in php-openid 2.2.2-1.

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
<?php
/**
 * Functions for dealing with OpenID trust roots
 *
 * 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
 */

require_once 'Auth/OpenID/Discover.php';

/**
 * A regular expression that matches a domain ending in a top-level domains.
 * Used in checking trust roots for sanity.
 *
 * @access private
 */
define('Auth_OpenID___TLDs',
       '/\.(ac|ad|ae|aero|af|ag|ai|al|am|an|ao|aq|ar|arpa|as|asia' .
       '|at|au|aw|ax|az|ba|bb|bd|be|bf|bg|bh|bi|biz|bj|bm|bn|bo|br' .
       '|bs|bt|bv|bw|by|bz|ca|cat|cc|cd|cf|cg|ch|ci|ck|cl|cm|cn|co' .
       '|com|coop|cr|cu|cv|cx|cy|cz|de|dj|dk|dm|do|dz|ec|edu|ee|eg' .
       '|er|es|et|eu|fi|fj|fk|fm|fo|fr|ga|gb|gd|ge|gf|gg|gh|gi|gl' .
       '|gm|gn|gov|gp|gq|gr|gs|gt|gu|gw|gy|hk|hm|hn|hr|ht|hu|id|ie' .
       '|il|im|in|info|int|io|iq|ir|is|it|je|jm|jo|jobs|jp|ke|kg|kh' .
       '|ki|km|kn|kp|kr|kw|ky|kz|la|lb|lc|li|lk|lr|ls|lt|lu|lv|ly' .
       '|ma|mc|md|me|mg|mh|mil|mk|ml|mm|mn|mo|mobi|mp|mq|mr|ms|mt' .
       '|mu|museum|mv|mw|mx|my|mz|na|name|nc|ne|net|nf|ng|ni|nl|no' .
       '|np|nr|nu|nz|om|org|pa|pe|pf|pg|ph|pk|pl|pm|pn|pr|pro|ps|pt' .
       '|pw|py|qa|re|ro|rs|ru|rw|sa|sb|sc|sd|se|sg|sh|si|sj|sk|sl' .
       '|sm|sn|so|sr|st|su|sv|sy|sz|tc|td|tel|tf|tg|th|tj|tk|tl|tm' .
       '|tn|to|tp|tr|travel|tt|tv|tw|tz|ua|ug|uk|us|uy|uz|va|vc|ve' .
       '|vg|vi|vn|vu|wf|ws|xn--0zwm56d|xn--11b5bs3a9aj6g' .
       '|xn--80akhbyknj4f|xn--9t4b11yi5a|xn--deba0ad|xn--g6w251d' .
       '|xn--hgbk6aj7f53bba|xn--hlcj6aya9esc7a|xn--jxalpdlp' .
       '|xn--kgbechtv|xn--zckzah|ye|yt|yu|za|zm|zw)\.?$/');

define('Auth_OpenID___HostSegmentRe',
       "/^(?:[-a-zA-Z0-9!$&'\\(\\)\\*+,;=._~]|%[a-zA-Z0-9]{2})*$/");

/**
 * A wrapper for trust-root related functions
 */
class Auth_OpenID_TrustRoot {
    /*
     * Return a discovery URL for this realm.
     *
     * Return null if the realm could not be parsed or was not valid.
     *
     * @param return_to The relying party return URL of the OpenID
     * authentication request
     *
     * @return The URL upon which relying party discovery should be
     * run in order to verify the return_to URL
     */
    static function buildDiscoveryURL($realm)
    {
        $parsed = Auth_OpenID_TrustRoot::_parse($realm);

        if ($parsed === false) {
            return false;
        }

        if ($parsed['wildcard']) {
            // Use "www." in place of the star
            if ($parsed['host'][0] != '.') {
                return false;
            }

            $www_domain = 'www' . $parsed['host'];

            return sprintf('%s://%s%s', $parsed['scheme'],
                           $www_domain, $parsed['path']);
        } else {
            return $parsed['unparsed'];
        }
    }

    /**
     * Parse a URL into its trust_root parts.
     *
     * @static
     *
     * @access private
     *
     * @param string $trust_root The url to parse
     *
     * @return mixed $parsed Either an associative array of trust root
     * parts or false if parsing failed.
     */
    static function _parse($trust_root)
    {
        $trust_root = Auth_OpenID_urinorm($trust_root);
        if ($trust_root === null) {
            return false;
        }

        if (preg_match("/:\/\/[^:]+(:\d+){2,}(\/|$)/", $trust_root)) {
            return false;
        }

        $parts = @parse_url($trust_root);
        if ($parts === false) {
            return false;
        }

        $required_parts = array('scheme', 'host');
        $forbidden_parts = array('user', 'pass', 'fragment');
        $keys = array_keys($parts);
        if (array_intersect($keys, $required_parts) != $required_parts) {
            return false;
        }

        if (array_intersect($keys, $forbidden_parts) != array()) {
            return false;
        }

        if (!preg_match(Auth_OpenID___HostSegmentRe, $parts['host'])) {
            return false;
        }

        $scheme = strtolower($parts['scheme']);
        $allowed_schemes = array('http', 'https');
        if (!in_array($scheme, $allowed_schemes)) {
            return false;
        }
        $parts['scheme'] = $scheme;

        $host = strtolower($parts['host']);
        $hostparts = explode('*', $host);
        switch (count($hostparts)) {
        case 1:
            $parts['wildcard'] = false;
            break;
        case 2:
            if ($hostparts[0] ||
                ($hostparts[1] && substr($hostparts[1], 0, 1) != '.')) {
                return false;
            }
            $host = $hostparts[1];
            $parts['wildcard'] = true;
            break;
        default:
            return false;
        }
        if (strpos($host, ':') !== false) {
            return false;
        }

        $parts['host'] = $host;

        if (isset($parts['path'])) {
            $path = strtolower($parts['path']);
            if (substr($path, 0, 1) != '/') {
                return false;
            }
        } else {
            $path = '/';
        }

        $parts['path'] = $path;
        if (!isset($parts['port'])) {
            $parts['port'] = false;
        }


        $parts['unparsed'] = $trust_root;

        return $parts;
    }

    /**
     * Is this trust root sane?
     *
     * A trust root is sane if it is syntactically valid and it has a
     * reasonable domain name. Specifically, the domain name must be
     * more than one level below a standard TLD or more than two
     * levels below a two-letter tld.
     *
     * For example, '*.com' is not a sane trust root, but '*.foo.com'
     * is.  '*.co.uk' is not sane, but '*.bbc.co.uk' is.
     *
     * This check is not always correct, but it attempts to err on the
     * side of marking sane trust roots insane instead of marking
     * insane trust roots sane. For example, 'kink.fm' is marked as
     * insane even though it "should" (for some meaning of should) be
     * marked sane.
     *
     * This function should be used when creating OpenID servers to
     * alert the users of the server when a consumer attempts to get
     * the user to accept a suspicious trust root.
     *
     * @static
     * @param string $trust_root The trust root to check
     * @return bool $sanity Whether the trust root looks OK
     */
    static function isSane($trust_root)
    {
        $parts = Auth_OpenID_TrustRoot::_parse($trust_root);
        if ($parts === false) {
            return false;
        }

        // Localhost is a special case
        if ($parts['host'] == 'localhost') {
            return true;
        }
        
        $host_parts = explode('.', $parts['host']);
        if ($parts['wildcard']) {
            // Remove the empty string from the beginning of the array
            array_shift($host_parts);
        }

        if ($host_parts && !$host_parts[count($host_parts) - 1]) {
            array_pop($host_parts);
        }

        if (!$host_parts) {
            return false;
        }

        // Don't allow adjacent dots
        if (in_array('', $host_parts, true)) {
            return false;
        }

        // Get the top-level domain of the host. If it is not a valid TLD,
        // it's not sane.
        preg_match(Auth_OpenID___TLDs, $parts['host'], $matches);
        if (!$matches) {
            return false;
        }
        $tld = $matches[1];

        if (count($host_parts) == 1) {
            return false;
        }

        if ($parts['wildcard']) {
            // It's a 2-letter tld with a short second to last segment
            // so there needs to be more than two segments specified
            // (e.g. *.co.uk is insane)
            $second_level = $host_parts[count($host_parts) - 2];
            if (strlen($tld) == 2 && strlen($second_level) <= 3) {
                return count($host_parts) > 2;
            }
        }

        return true;
    }

    /**
     * Does this URL match the given trust root?
     *
     * Return whether the URL falls under the given trust root. This
     * does not check whether the trust root is sane. If the URL or
     * trust root do not parse, this function will return false.
     *
     * @param string $trust_root The trust root to match against
     *
     * @param string $url The URL to check
     *
     * @return bool $matches Whether the URL matches against the
     * trust root
     */
    static function match($trust_root, $url)
    {
        $trust_root_parsed = Auth_OpenID_TrustRoot::_parse($trust_root);
        $url_parsed = Auth_OpenID_TrustRoot::_parse($url);
        if (!$trust_root_parsed || !$url_parsed) {
            return false;
        }

        // Check hosts matching
        if ($url_parsed['wildcard']) {
            return false;
        }
        if ($trust_root_parsed['wildcard']) {
            $host_tail = $trust_root_parsed['host'];
            $host = $url_parsed['host'];
            if ($host_tail &&
                substr($host, -(strlen($host_tail))) != $host_tail &&
                substr($host_tail, 1) != $host) {
                return false;
            }
        } else {
            if ($trust_root_parsed['host'] != $url_parsed['host']) {
                return false;
            }
        }

        // Check path and query matching
        $base_path = $trust_root_parsed['path'];
        $path = $url_parsed['path'];
        if (!isset($trust_root_parsed['query'])) {
            if ($base_path != $path) {
                if (substr($path, 0, strlen($base_path)) != $base_path) {
                    return false;
                }
                if (substr($base_path, strlen($base_path) - 1, 1) != '/' &&
                    substr($path, strlen($base_path), 1) != '/') {
                    return false;
                }
            }
        } else {
            $base_query = $trust_root_parsed['query'];
            $query = @$url_parsed['query'];
            $qplus = substr($query, 0, strlen($base_query) + 1);
            $bqplus = $base_query . '&';
            if ($base_path != $path ||
                ($base_query != $query && $qplus != $bqplus)) {
                return false;
            }
        }

        // The port and scheme need to match exactly
        return ($trust_root_parsed['scheme'] == $url_parsed['scheme'] &&
                $url_parsed['port'] === $trust_root_parsed['port']);
    }
}

/*
 * If the endpoint is a relying party OpenID return_to endpoint,
 * return the endpoint URL. Otherwise, return None.
 *
 * This function is intended to be used as a filter for the Yadis
 * filtering interface.
 *
 * @see: C{L{openid.yadis.services}}
 * @see: C{L{openid.yadis.filters}}
 *
 * @param endpoint: An XRDS BasicServiceEndpoint, as returned by
 * performing Yadis dicovery.
 *
 * @returns: The endpoint URL or None if the endpoint is not a
 * relying party endpoint.
 */
function filter_extractReturnURL($endpoint)
{
    if ($endpoint->matchTypes(array(Auth_OpenID_RP_RETURN_TO_URL_TYPE))) {
        return $endpoint;
    } else {
        return null;
    }
}

function &Auth_OpenID_extractReturnURL(&$endpoint_list)
{
    $result = array();

    foreach ($endpoint_list as $endpoint) {
        if (filter_extractReturnURL($endpoint)) {
            $result[] = $endpoint;
        }
    }

    return $result;
}

/*
 * Is the return_to URL under one of the supplied allowed return_to
 * URLs?
 */
function Auth_OpenID_returnToMatches($allowed_return_to_urls, $return_to)
{
    foreach ($allowed_return_to_urls as $allowed_return_to) {
        // A return_to pattern works the same as a realm, except that
        // it's not allowed to use a wildcard. We'll model this by
        // parsing it as a realm, and not trying to match it if it has
        // a wildcard.

        $return_realm = Auth_OpenID_TrustRoot::_parse($allowed_return_to);
        if (// Parses as a trust root
            ($return_realm !== false) &&
            // Does not have a wildcard
            (!$return_realm['wildcard']) &&
            // Matches the return_to that we passed in with it
            (Auth_OpenID_TrustRoot::match($allowed_return_to, $return_to))) {
            return true;
        }
    }

    // No URL in the list matched
    return false;
}

/*
 * Given a relying party discovery URL return a list of return_to
 * URLs.
 */
function Auth_OpenID_getAllowedReturnURLs($relying_party_url, $fetcher,
              $discover_function=null)
{
    if ($discover_function === null) {
        $discover_function = array('Auth_Yadis_Yadis', 'discover');
    }

    $xrds_parse_cb = array('Auth_OpenID_ServiceEndpoint', 'consumerFromXRDS');

    list($rp_url_after_redirects, $endpoints) =
        Auth_Yadis_getServiceEndpoints($relying_party_url, $xrds_parse_cb,
                                       $discover_function, $fetcher);

    if ($rp_url_after_redirects != $relying_party_url) {
        // Verification caused a redirect
        return false;
    }

    call_user_func_array($discover_function,
                         array($relying_party_url, &$fetcher));

    $return_to_urls = array();
    $matching_endpoints = Auth_OpenID_extractReturnURL($endpoints);

    foreach ($matching_endpoints as $e) {
        $return_to_urls[] = $e->server_url;
    }

    return $return_to_urls;
}

/*
 * Verify that a return_to URL is valid for the given realm.
 *
 * This function builds a discovery URL, performs Yadis discovery on
 * it, makes sure that the URL does not redirect, parses out the
 * return_to URLs, and finally checks to see if the current return_to
 * URL matches the return_to.
 *
 * @return true if the return_to URL is valid for the realm
 */
function Auth_OpenID_verifyReturnTo($realm_str, $return_to, $fetcher,
              $_vrfy='Auth_OpenID_getAllowedReturnURLs')
{
    $disco_url = Auth_OpenID_TrustRoot::buildDiscoveryURL($realm_str);

    if ($disco_url === false) {
        return false;
    }

    $allowable_urls = call_user_func_array($_vrfy,
                           array($disco_url, $fetcher));

    // The realm_str could not be parsed.
    if ($allowable_urls === false) {
        return false;
    }

    if (Auth_OpenID_returnToMatches($allowable_urls, $return_to)) {
        return true;
    } else {
        return false;
    }
}