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+<?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 Auth_OpenID_CryptUtil::constEq($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];
+ }
+}
+