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<?php
/**
* An implementation of the OpenID Provider Authentication Policy
* Extension 1.0
*
* See:
* http://openid.net/developers/specs/
*/
require_once "Auth/OpenID/Extension.php";
define('Auth_OpenID_PAPE_NS_URI',
"http://specs.openid.net/extensions/pape/1.0");
define('PAPE_AUTH_MULTI_FACTOR_PHYSICAL',
'http://schemas.openid.net/pape/policies/2007/06/multi-factor-physical');
define('PAPE_AUTH_MULTI_FACTOR',
'http://schemas.openid.net/pape/policies/2007/06/multi-factor');
define('PAPE_AUTH_PHISHING_RESISTANT',
'http://schemas.openid.net/pape/policies/2007/06/phishing-resistant');
define('PAPE_TIME_VALIDATOR',
'/^[0-9]{4,4}-[0-9][0-9]-[0-9][0-9]T[0-9][0-9]:[0-9][0-9]:[0-9][0-9]Z$/');
/**
* A Provider Authentication Policy request, sent from a relying party
* to a provider
*
* preferred_auth_policies: The authentication policies that
* the relying party prefers
*
* max_auth_age: The maximum time, in seconds, that the relying party
* wants to allow to have elapsed before the user must re-authenticate
*/
class Auth_OpenID_PAPE_Request extends Auth_OpenID_Extension {
var $ns_alias = 'pape';
var $ns_uri = Auth_OpenID_PAPE_NS_URI;
function Auth_OpenID_PAPE_Request($preferred_auth_policies=null,
$max_auth_age=null)
{
if ($preferred_auth_policies === null) {
$preferred_auth_policies = array();
}
$this->preferred_auth_policies = $preferred_auth_policies;
$this->max_auth_age = $max_auth_age;
}
/**
* Add an acceptable authentication policy URI to this request
*
* This method is intended to be used by the relying party to add
* acceptable authentication types to the request.
*
* policy_uri: The identifier for the preferred type of
* authentication.
*/
function addPolicyURI($policy_uri)
{
if (!in_array($policy_uri, $this->preferred_auth_policies)) {
$this->preferred_auth_policies[] = $policy_uri;
}
}
function getExtensionArgs()
{
$ns_args = array(
'preferred_auth_policies' =>
implode(' ', $this->preferred_auth_policies)
);
if ($this->max_auth_age !== null) {
$ns_args['max_auth_age'] = strval($this->max_auth_age);
}
return $ns_args;
}
/**
* Instantiate a Request object from the arguments in a checkid_*
* OpenID message
*/
static function fromOpenIDRequest($request)
{
$obj = new Auth_OpenID_PAPE_Request();
$args = $request->message->getArgs(Auth_OpenID_PAPE_NS_URI);
if ($args === null || $args === array()) {
return null;
}
$obj->parseExtensionArgs($args);
return $obj;
}
/**
* Set the state of this request to be that expressed in these
* PAPE arguments
*
* @param args: The PAPE arguments without a namespace
*/
function parseExtensionArgs($args)
{
// preferred_auth_policies is a space-separated list of policy
// URIs
$this->preferred_auth_policies = array();
$policies_str = Auth_OpenID::arrayGet($args, 'preferred_auth_policies');
if ($policies_str) {
foreach (explode(' ', $policies_str) as $uri) {
if (!in_array($uri, $this->preferred_auth_policies)) {
$this->preferred_auth_policies[] = $uri;
}
}
}
// max_auth_age is base-10 integer number of seconds
$max_auth_age_str = Auth_OpenID::arrayGet($args, 'max_auth_age');
if ($max_auth_age_str) {
$this->max_auth_age = Auth_OpenID::intval($max_auth_age_str);
} else {
$this->max_auth_age = null;
}
}
/**
* Given a list of authentication policy URIs that a provider
* supports, this method returns the subsequence of those types
* that are preferred by the relying party.
*
* @param supported_types: A sequence of authentication policy
* type URIs that are supported by a provider
*
* @return array The sub-sequence of the supported types that are
* preferred by the relying party. This list will be ordered in
* the order that the types appear in the supported_types
* sequence, and may be empty if the provider does not prefer any
* of the supported authentication types.
*/
function preferredTypes($supported_types)
{
$result = array();
foreach ($supported_types as $st) {
if (in_array($st, $this->preferred_auth_policies)) {
$result[] = $st;
}
}
return $result;
}
}
/**
* A Provider Authentication Policy response, sent from a provider to
* a relying party
*/
class Auth_OpenID_PAPE_Response extends Auth_OpenID_Extension {
var $ns_alias = 'pape';
var $ns_uri = Auth_OpenID_PAPE_NS_URI;
function Auth_OpenID_PAPE_Response($auth_policies=null, $auth_time=null,
$nist_auth_level=null)
{
if ($auth_policies) {
$this->auth_policies = $auth_policies;
} else {
$this->auth_policies = array();
}
$this->auth_time = $auth_time;
$this->nist_auth_level = $nist_auth_level;
}
/**
* Add a authentication policy to this response
*
* This method is intended to be used by the provider to add a
* policy that the provider conformed to when authenticating the
* user.
*
* @param policy_uri: The identifier for the preferred type of
* authentication.
*/
function addPolicyURI($policy_uri)
{
if (!in_array($policy_uri, $this->auth_policies)) {
$this->auth_policies[] = $policy_uri;
}
}
/**
* Create an Auth_OpenID_PAPE_Response object from a successful
* OpenID library response.
*
* @param success_response $success_response A SuccessResponse
* from Auth_OpenID_Consumer::complete()
*
* @returns: A provider authentication policy response from the
* data that was supplied with the id_res response.
*/
static function fromSuccessResponse($success_response)
{
$obj = new Auth_OpenID_PAPE_Response();
// PAPE requires that the args be signed.
$args = $success_response->getSignedNS(Auth_OpenID_PAPE_NS_URI);
if ($args === null || $args === array()) {
return null;
}
$result = $obj->parseExtensionArgs($args);
if ($result === false) {
return null;
} else {
return $obj;
}
}
/**
* Parse the provider authentication policy arguments into the
* internal state of this object
*
* @param args: unqualified provider authentication policy
* arguments
*
* @param strict: Whether to return false when bad data is
* encountered
*
* @return null The data is parsed into the internal fields of
* this object.
*/
function parseExtensionArgs($args, $strict=false)
{
$policies_str = Auth_OpenID::arrayGet($args, 'auth_policies');
if ($policies_str && $policies_str != "none") {
$this->auth_policies = explode(" ", $policies_str);
}
$nist_level_str = Auth_OpenID::arrayGet($args, 'nist_auth_level');
if ($nist_level_str !== null) {
$nist_level = Auth_OpenID::intval($nist_level_str);
if ($nist_level === false) {
if ($strict) {
return false;
} else {
$nist_level = null;
}
}
if (0 <= $nist_level && $nist_level < 5) {
$this->nist_auth_level = $nist_level;
} else if ($strict) {
return false;
}
}
$auth_time = Auth_OpenID::arrayGet($args, 'auth_time');
if ($auth_time !== null) {
if (preg_match(PAPE_TIME_VALIDATOR, $auth_time)) {
$this->auth_time = $auth_time;
} else if ($strict) {
return false;
}
}
}
function getExtensionArgs()
{
$ns_args = array();
if (count($this->auth_policies) > 0) {
$ns_args['auth_policies'] = implode(' ', $this->auth_policies);
} else {
$ns_args['auth_policies'] = 'none';
}
if ($this->nist_auth_level !== null) {
if (!in_array($this->nist_auth_level, range(0, 4), true)) {
return false;
}
$ns_args['nist_auth_level'] = strval($this->nist_auth_level);
}
if ($this->auth_time !== null) {
if (!preg_match(PAPE_TIME_VALIDATOR, $this->auth_time)) {
return false;
}
$ns_args['auth_time'] = $this->auth_time;
}
return $ns_args;
}
}
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