Radius.php

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<?php
 
class sspmod_radius_Auth_Source_Radius extends sspmod_core_Auth_UserPassBase
{
    private $servers;
 
    private $hostname;
 
    private $port;
 
    private $secret;
 
    private $timeout;
 
    private $retries;
 
    private $realm;
 
    private $usernameAttribute;
 
    private $vendor;
 
    private $vendorType;
 
    private $nasIdentifier;
 
    public function __construct($info, $config)
    {
        assert('is_array($info)');
        assert('is_array($config)');
 
        // Call the parent constructor first, as required by the interface
        parent::__construct($info, $config);
 
        // Parse configuration.
        $config = SimpleSAML_Configuration::loadFromArray($config,
            'Authentication source ' . var_export($this->authId, true));
 
        $this->servers = $config->getArray('servers', array());
        /* For backwards compatibility. */
        if (empty($this->servers)) {
            $this->hostname = $config->getString('hostname');
            $this->port = $config->getIntegerRange('port', 1, 65535, 1812);
            $this->secret = $config->getString('secret');
            $this->servers[] = array('hostname' => $this->hostname,
                                     'port' => $this->port,
                                     'secret' => $this->secret);
        }
        $this->timeout = $config->getInteger('timeout', 5);
        $this->retries = $config->getInteger('retries', 3);
        $this->realm = $config->getString('realm', null);
        $this->usernameAttribute = $config->getString('username_attribute', null);
        $this->nasIdentifier = $config->getString('nas_identifier',
            \SimpleSAML\Utils\HTTP::getSelfHost());
 
        $this->vendor = $config->getInteger('attribute_vendor', null);
        if ($this->vendor !== null) {
            $this->vendorType = $config->getInteger('attribute_vendor_type');
        }
    }
 
 
    protected function login($username, $password)
    {
        assert('is_string($username)');
        assert('is_string($password)');
 
        $radius = radius_auth_open();
 
        /* Try to add all radius servers, trigger a failure if no one works. */
        $success = false;
        foreach ($this->servers as $server) {
            if (!isset($server['port'])) {
                $server['port'] = 1812;
            }
            if (!radius_add_server($radius,
                $server['hostname'], $server['port'], $server['secret'], 
                $this->timeout, $this->retries)) {
                SimpleSAML\Logger::info("Could not add radius server: " .
                    radius_strerror($radius));
                continue;
            }
            $success = true;
        }
        if (!$success) {
            throw new Exception('Error adding radius servers, no servers available');
        }
 
        if (!radius_create_request($radius, RADIUS_ACCESS_REQUEST)) {
            throw new Exception('Error creating radius request: ' .
                radius_strerror($radius));
        }
 
        if ($this->realm === null) {
            radius_put_attr($radius, RADIUS_USER_NAME, $username);
        } else {
            radius_put_attr($radius, RADIUS_USER_NAME, $username . '@' . $this->realm);
        }
        radius_put_attr($radius, RADIUS_USER_PASSWORD, $password);
 
        if ($this->nasIdentifier !== null) {
            radius_put_attr($radius, RADIUS_NAS_IDENTIFIER, $this->nasIdentifier);
        }
 
        $res = radius_send_request($radius);
        if ($res != RADIUS_ACCESS_ACCEPT) {
            switch ($res) {
            case RADIUS_ACCESS_REJECT:
                /* Invalid username or password. */
                throw new SimpleSAML_Error_Error('WRONGUSERPASS');
            case RADIUS_ACCESS_CHALLENGE:
                throw new Exception('Radius authentication error: Challenge requested, but not supported.');
            default:
                throw new Exception('Error during radius authentication: ' .
                    radius_strerror($radius));
            }
        }
 
        /* If we get this far, we have a valid login. */
 
        $attributes = array();
 
        if ($this->usernameAttribute !== null) {
            $attributes[$this->usernameAttribute] = array($username);
        }
 
        if ($this->vendor === null) {
            /*
             * We aren't interested in any vendor-specific attributes. We are
             * therefore done now.
             */
            return $attributes;
        }
 
        /* get AAI attribute sets. Contributed by Stefan Winter, (c) RESTENA */
        while ($resa = radius_get_attr($radius)) {
 
            if (!is_array($resa)) {
                throw new Exception('Error getting radius attributes: ' .
                    radius_strerror($radius));
            }
 
            /* Use the received user name */
            if ($resa['attr'] == RADIUS_USER_NAME) {
                $attributes[$this->usernameAttribute] = array($resa['data']);
                continue;
            }
 
            if ($resa['attr'] !== RADIUS_VENDOR_SPECIFIC) {
                continue;
            }
 
            $resv = radius_get_vendor_attr($resa['data']);
            if (!is_array($resv)) {
                throw new Exception('Error getting vendor specific attribute: ' .
                    radius_strerror($radius));
            }
 
            $vendor = $resv['vendor'];
            $attrv = $resv['attr'];
            $datav = $resv['data'];
 
            if ($vendor != $this->vendor || $attrv != $this->vendorType) {
                continue;
            }
 
            $attrib_name = strtok($datav,'=');
            $attrib_value = strtok('=');
 
            /* if the attribute name is already in result set,
                add another value */
            if (array_key_exists($attrib_name, $attributes)) {
                $attributes[$attrib_name][] = $attrib_value;
            } else {
                $attributes[$attrib_name] = array($attrib_value);
            }
        }
        /* end of contribution */
 
        return $attributes;
    }
}