462 lines
14 KiB
PHP
462 lines
14 KiB
PHP
<?php
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/**
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* Functions for dealing with OpenID trust roots
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*
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* PHP versions 4 and 5
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*
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* LICENSE: See the COPYING file included in this distribution.
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*
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* @package OpenID
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* @author JanRain, Inc. <openid@janrain.com>
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* @copyright 2005-2008 Janrain, Inc.
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* @license http://www.apache.org/licenses/LICENSE-2.0 Apache
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*/
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require_once 'Auth/OpenID/Discover.php';
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/**
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* A regular expression that matches a domain ending in a top-level domains.
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* Used in checking trust roots for sanity.
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*
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* @access private
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*/
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define('Auth_OpenID___TLDs',
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'/\.(ac|ad|ae|aero|af|ag|ai|al|am|an|ao|aq|ar|arpa|as|asia' .
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'|at|au|aw|ax|az|ba|bb|bd|be|bf|bg|bh|bi|biz|bj|bm|bn|bo|br' .
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'|bs|bt|bv|bw|by|bz|ca|cat|cc|cd|cf|cg|ch|ci|ck|cl|cm|cn|co' .
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'|com|coop|cr|cu|cv|cx|cy|cz|de|dj|dk|dm|do|dz|ec|edu|ee|eg' .
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'|er|es|et|eu|fi|fj|fk|fm|fo|fr|ga|gb|gd|ge|gf|gg|gh|gi|gl' .
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'|gm|gn|gov|gp|gq|gr|gs|gt|gu|gw|gy|hk|hm|hn|hr|ht|hu|id|ie' .
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'|il|im|in|info|int|io|iq|ir|is|it|je|jm|jo|jobs|jp|ke|kg|kh' .
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'|ki|km|kn|kp|kr|kw|ky|kz|la|lb|lc|li|lk|lr|ls|lt|lu|lv|ly' .
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'|ma|mc|md|me|mg|mh|mil|mk|ml|mm|mn|mo|mobi|mp|mq|mr|ms|mt' .
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'|mu|museum|mv|mw|mx|my|mz|na|name|nc|ne|net|nf|ng|ni|nl|no' .
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'|np|nr|nu|nz|om|org|pa|pe|pf|pg|ph|pk|pl|pm|pn|pr|pro|ps|pt' .
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'|pw|py|qa|re|ro|rs|ru|rw|sa|sb|sc|sd|se|sg|sh|si|sj|sk|sl' .
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'|sm|sn|so|sr|st|su|sv|sy|sz|tc|td|tel|tf|tg|th|tj|tk|tl|tm' .
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'|tn|to|tp|tr|travel|tt|tv|tw|tz|ua|ug|uk|us|uy|uz|va|vc|ve' .
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'|vg|vi|vn|vu|wf|ws|xn--0zwm56d|xn--11b5bs3a9aj6g' .
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'|xn--80akhbyknj4f|xn--9t4b11yi5a|xn--deba0ad|xn--g6w251d' .
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'|xn--hgbk6aj7f53bba|xn--hlcj6aya9esc7a|xn--jxalpdlp' .
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'|xn--kgbechtv|xn--zckzah|ye|yt|yu|za|zm|zw)\.?$/');
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define('Auth_OpenID___HostSegmentRe',
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"/^(?:[-a-zA-Z0-9!$&'\\(\\)\\*+,;=._~]|%[a-zA-Z0-9]{2})*$/");
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/**
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* A wrapper for trust-root related functions
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*/
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class Auth_OpenID_TrustRoot {
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/*
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* Return a discovery URL for this realm.
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*
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* Return null if the realm could not be parsed or was not valid.
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*
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* @param return_to The relying party return URL of the OpenID
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* authentication request
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*
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* @return The URL upon which relying party discovery should be
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* run in order to verify the return_to URL
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*/
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function buildDiscoveryURL($realm)
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{
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$parsed = Auth_OpenID_TrustRoot::_parse($realm);
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if ($parsed === false) {
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return false;
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}
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if ($parsed['wildcard']) {
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// Use "www." in place of the star
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if ($parsed['host'][0] != '.') {
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return false;
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}
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$www_domain = 'www' . $parsed['host'];
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return sprintf('%s://%s%s', $parsed['scheme'],
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$www_domain, $parsed['path']);
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} else {
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return $parsed['unparsed'];
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}
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}
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/**
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* Parse a URL into its trust_root parts.
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*
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* @static
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*
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* @access private
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*
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* @param string $trust_root The url to parse
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*
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* @return mixed $parsed Either an associative array of trust root
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* parts or false if parsing failed.
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*/
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function _parse($trust_root)
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{
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$trust_root = Auth_OpenID_urinorm($trust_root);
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if ($trust_root === null) {
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return false;
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}
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if (preg_match("/:\/\/[^:]+(:\d+){2,}(\/|$)/", $trust_root)) {
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return false;
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}
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$parts = @parse_url($trust_root);
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if ($parts === false) {
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return false;
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}
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$required_parts = array('scheme', 'host');
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$forbidden_parts = array('user', 'pass', 'fragment');
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$keys = array_keys($parts);
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if (array_intersect($keys, $required_parts) != $required_parts) {
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return false;
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}
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if (array_intersect($keys, $forbidden_parts) != array()) {
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return false;
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}
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if (!preg_match(Auth_OpenID___HostSegmentRe, $parts['host'])) {
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return false;
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}
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$scheme = strtolower($parts['scheme']);
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$allowed_schemes = array('http', 'https');
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if (!in_array($scheme, $allowed_schemes)) {
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return false;
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}
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$parts['scheme'] = $scheme;
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$host = strtolower($parts['host']);
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$hostparts = explode('*', $host);
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switch (count($hostparts)) {
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case 1:
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$parts['wildcard'] = false;
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break;
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case 2:
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if ($hostparts[0] ||
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($hostparts[1] && substr($hostparts[1], 0, 1) != '.')) {
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return false;
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}
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$host = $hostparts[1];
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$parts['wildcard'] = true;
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break;
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default:
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return false;
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}
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if (strpos($host, ':') !== false) {
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return false;
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}
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$parts['host'] = $host;
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if (isset($parts['path'])) {
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$path = strtolower($parts['path']);
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if (substr($path, 0, 1) != '/') {
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return false;
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}
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} else {
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$path = '/';
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}
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$parts['path'] = $path;
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if (!isset($parts['port'])) {
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$parts['port'] = false;
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}
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$parts['unparsed'] = $trust_root;
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return $parts;
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}
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/**
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* Is this trust root sane?
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*
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* A trust root is sane if it is syntactically valid and it has a
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* reasonable domain name. Specifically, the domain name must be
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* more than one level below a standard TLD or more than two
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* levels below a two-letter tld.
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*
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* For example, '*.com' is not a sane trust root, but '*.foo.com'
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* is. '*.co.uk' is not sane, but '*.bbc.co.uk' is.
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*
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* This check is not always correct, but it attempts to err on the
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* side of marking sane trust roots insane instead of marking
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* insane trust roots sane. For example, 'kink.fm' is marked as
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* insane even though it "should" (for some meaning of should) be
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* marked sane.
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*
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* This function should be used when creating OpenID servers to
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* alert the users of the server when a consumer attempts to get
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* the user to accept a suspicious trust root.
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*
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* @static
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* @param string $trust_root The trust root to check
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* @return bool $sanity Whether the trust root looks OK
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*/
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function isSane($trust_root)
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{
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$parts = Auth_OpenID_TrustRoot::_parse($trust_root);
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if ($parts === false) {
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return false;
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}
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// Localhost is a special case
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if ($parts['host'] == 'localhost') {
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return true;
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}
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$host_parts = explode('.', $parts['host']);
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if ($parts['wildcard']) {
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// Remove the empty string from the beginning of the array
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array_shift($host_parts);
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}
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if ($host_parts && !$host_parts[count($host_parts) - 1]) {
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array_pop($host_parts);
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}
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if (!$host_parts) {
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return false;
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}
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// Don't allow adjacent dots
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if (in_array('', $host_parts, true)) {
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return false;
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}
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// Get the top-level domain of the host. If it is not a valid TLD,
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// it's not sane.
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preg_match(Auth_OpenID___TLDs, $parts['host'], $matches);
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if (!$matches) {
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return false;
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}
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$tld = $matches[1];
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if (count($host_parts) == 1) {
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return false;
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}
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if ($parts['wildcard']) {
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// It's a 2-letter tld with a short second to last segment
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// so there needs to be more than two segments specified
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// (e.g. *.co.uk is insane)
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$second_level = $host_parts[count($host_parts) - 2];
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if (strlen($tld) == 2 && strlen($second_level) <= 3) {
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return count($host_parts) > 2;
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}
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}
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return true;
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}
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/**
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* Does this URL match the given trust root?
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*
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* Return whether the URL falls under the given trust root. This
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* does not check whether the trust root is sane. If the URL or
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* trust root do not parse, this function will return false.
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*
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* @param string $trust_root The trust root to match against
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*
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* @param string $url The URL to check
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*
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* @return bool $matches Whether the URL matches against the
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* trust root
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*/
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function match($trust_root, $url)
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{
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$trust_root_parsed = Auth_OpenID_TrustRoot::_parse($trust_root);
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$url_parsed = Auth_OpenID_TrustRoot::_parse($url);
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if (!$trust_root_parsed || !$url_parsed) {
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return false;
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}
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// Check hosts matching
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if ($url_parsed['wildcard']) {
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return false;
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}
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if ($trust_root_parsed['wildcard']) {
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$host_tail = $trust_root_parsed['host'];
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$host = $url_parsed['host'];
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if ($host_tail &&
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substr($host, -(strlen($host_tail))) != $host_tail &&
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substr($host_tail, 1) != $host) {
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return false;
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}
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} else {
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if ($trust_root_parsed['host'] != $url_parsed['host']) {
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return false;
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}
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}
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// Check path and query matching
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$base_path = $trust_root_parsed['path'];
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$path = $url_parsed['path'];
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if (!isset($trust_root_parsed['query'])) {
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if ($base_path != $path) {
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if (substr($path, 0, strlen($base_path)) != $base_path) {
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return false;
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}
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if (substr($base_path, strlen($base_path) - 1, 1) != '/' &&
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substr($path, strlen($base_path), 1) != '/') {
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return false;
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}
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}
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} else {
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$base_query = $trust_root_parsed['query'];
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$query = @$url_parsed['query'];
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$qplus = substr($query, 0, strlen($base_query) + 1);
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$bqplus = $base_query . '&';
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if ($base_path != $path ||
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($base_query != $query && $qplus != $bqplus)) {
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return false;
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}
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}
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// The port and scheme need to match exactly
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return ($trust_root_parsed['scheme'] == $url_parsed['scheme'] &&
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$url_parsed['port'] === $trust_root_parsed['port']);
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}
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}
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/*
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* If the endpoint is a relying party OpenID return_to endpoint,
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* return the endpoint URL. Otherwise, return None.
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*
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* This function is intended to be used as a filter for the Yadis
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* filtering interface.
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*
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* @see: C{L{openid.yadis.services}}
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* @see: C{L{openid.yadis.filters}}
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*
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* @param endpoint: An XRDS BasicServiceEndpoint, as returned by
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* performing Yadis dicovery.
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*
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* @returns: The endpoint URL or None if the endpoint is not a
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* relying party endpoint.
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*/
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function filter_extractReturnURL(&$endpoint)
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{
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if ($endpoint->matchTypes(array(Auth_OpenID_RP_RETURN_TO_URL_TYPE))) {
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return $endpoint;
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} else {
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return null;
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}
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}
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function &Auth_OpenID_extractReturnURL(&$endpoint_list)
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{
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$result = array();
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foreach ($endpoint_list as $endpoint) {
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if (filter_extractReturnURL($endpoint)) {
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$result[] = $endpoint;
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}
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}
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return $result;
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}
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/*
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* Is the return_to URL under one of the supplied allowed return_to
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* URLs?
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*/
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function Auth_OpenID_returnToMatches($allowed_return_to_urls, $return_to)
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{
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foreach ($allowed_return_to_urls as $allowed_return_to) {
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// A return_to pattern works the same as a realm, except that
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// it's not allowed to use a wildcard. We'll model this by
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// parsing it as a realm, and not trying to match it if it has
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// a wildcard.
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$return_realm = Auth_OpenID_TrustRoot::_parse($allowed_return_to);
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if (// Parses as a trust root
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($return_realm !== false) &&
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// Does not have a wildcard
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(!$return_realm['wildcard']) &&
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// Matches the return_to that we passed in with it
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(Auth_OpenID_TrustRoot::match($allowed_return_to, $return_to))) {
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return true;
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}
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}
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// No URL in the list matched
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return false;
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}
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/*
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* Given a relying party discovery URL return a list of return_to
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* URLs.
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*/
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function Auth_OpenID_getAllowedReturnURLs($relying_party_url, &$fetcher,
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$discover_function=null)
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{
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if ($discover_function === null) {
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$discover_function = array('Auth_Yadis_Yadis', 'discover');
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}
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$xrds_parse_cb = array('Auth_OpenID_ServiceEndpoint', 'fromXRDS');
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list($rp_url_after_redirects, $endpoints) =
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Auth_Yadis_getServiceEndpoints($relying_party_url, $xrds_parse_cb,
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$discover_function, $fetcher);
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if ($rp_url_after_redirects != $relying_party_url) {
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// Verification caused a redirect
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return false;
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}
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call_user_func_array($discover_function,
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array($relying_party_url, $fetcher));
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$return_to_urls = array();
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$matching_endpoints = Auth_OpenID_extractReturnURL($endpoints);
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foreach ($matching_endpoints as $e) {
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$return_to_urls[] = $e->server_url;
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}
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return $return_to_urls;
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}
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/*
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* Verify that a return_to URL is valid for the given realm.
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*
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* This function builds a discovery URL, performs Yadis discovery on
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* it, makes sure that the URL does not redirect, parses out the
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* return_to URLs, and finally checks to see if the current return_to
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* URL matches the return_to.
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*
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* @return true if the return_to URL is valid for the realm
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*/
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function Auth_OpenID_verifyReturnTo($realm_str, $return_to, &$fetcher,
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$_vrfy='Auth_OpenID_getAllowedReturnURLs')
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{
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$disco_url = Auth_OpenID_TrustRoot::buildDiscoveryURL($realm_str);
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if ($disco_url === false) {
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return false;
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}
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$allowable_urls = call_user_func_array($_vrfy,
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array($disco_url, &$fetcher));
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// The realm_str could not be parsed.
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if ($allowable_urls === false) {
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return false;
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}
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if (Auth_OpenID_returnToMatches($allowable_urls, $return_to)) {
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return true;
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} else {
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return false;
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}
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}
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?>
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