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https://github.com/EGroupware/egroupware.git
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added dkim signature validation to ischedule_server
This commit is contained in:
Ralf Becker
parent
33510a2f4d
commit
0d5ae0e2c2
@ -75,6 +75,7 @@ class ischedule_server
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*/
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protected function post()
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{
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// get and verify required headers
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static $required_headers = array('Host','Recipient','Originator','Content-Type','DKIM-Signature');
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$headers = array();
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foreach($required_headers as $header)
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@ -83,13 +84,18 @@ class ischedule_server
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if (strpos($server_name, 'CONTENT_') !== 0) $server_name = 'HTTP_'.$server_name;
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if (!empty($_SERVER[$server_name])) $headers[$header] = $_SERVER[$server_name];
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}
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if (($missing = array_diff($required_headers, array_keys($headers))))
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if (($missing = array_diff(array_keys($headers), $required_headers)))
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{
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throw new Exception ('Bad Request: missing '.implode(', ', $missing).' header(s)', 400);
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}
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if (!$this->dkim_validate($headers))
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// get raw request body
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$ical = file_get_contents('php://input');
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// validate dkim signature
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if (!self::dkim_validate($headers, $ical, $error))
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{
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throw new Exception('Bad Request: DKIM signature invalid', 400);
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throw new Exception('Bad Request: DKIM signature invalid: '.$error, 400);
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}
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// check if recipient is a user
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// ToDo: multiple recipients
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@ -127,7 +133,6 @@ class ischedule_server
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throw new Exception ('Bad Request: missing or unsupported method in Content-Type header', 400);
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}
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// parse iCal
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$ical = file_get_contents('php://input');
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// code copied from calendar_groupdav::outbox_freebusy_request for now
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include_once EGW_SERVER_ROOT.'/phpgwapi/inc/horde/lib/core.php';
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$vcal = new Horde_iCalendar();
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@ -183,6 +188,10 @@ class ischedule_server
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$this->vfreebusy($event, $handler, $vcal_comp, $xml);
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break;
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case 'VEVENT':
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$this->vevent($event, $handler, $component, $xml);
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break;
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default:
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throw new exception('Not yet implemented!');
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}
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@ -196,6 +205,42 @@ class ischedule_server
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echo $xml->outputMemory();
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}
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/**
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* Handle VEVENT component
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*
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* @param array $event
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* @param calendar_ical $handler
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* @param string $ical
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* @param XMLWriter $xml
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*/
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function vevent(array $event, calendar_ical $handler, Horde_iCalendar_vevent $component, XMLWriter $xml)
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{
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$organizer = $component->getAttribute('ORGANIZER');
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$attendees = (array)$component->getAttribute('ATTENDEE');
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$handler->importVCal($vCalendar, $eventId,
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self::etag2value($this->http_if_match), false, 0, $this->groupdav->current_user_principal, $user, $charset, $id);
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foreach($event['participants'] as $uid => $status)
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{
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$xml->startElement('response');
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$xml->writeElement('recipient', $attendee=array_shift($attendees)); // iSchedule has not DAV:href!
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if (is_numeric($uid))
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{
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$xml->writeElement('request-status', '2.0;Success');
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$xml->writeElement('responsedescription', 'Delivered to recipient');
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}
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else
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{
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$xml->writeElement('request-status', '3.7;Invalid Calendar User');
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$xml->writeElement('responsedescription', 'Recipient not a local user');
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}
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$xml->endElement(); // response
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}
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}
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/**
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* Handle VFREEBUSY component
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*
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@ -233,16 +278,102 @@ class ischedule_server
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}
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}
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const DKIM_HEADERS = 'content-type:host:originator:recipient';
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/**
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* Validate DKIM signature
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*
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* @param array $headers
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* @param string $body
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* @param string &$error=null error if false returned
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* @return boolean true if signature could be validated, false otherwise
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* @todo
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*/
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public function dkim_validate(array $headers)
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public static function dkim_validate(array $headers, $body, &$error=null, $verify_headers='Content-Type:Host:Originator:Recipient')
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{
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return isset($headers['DKIM-Signature']);
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// parse dkim siginature
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if (!isset($headers['DKIM-Signature']) ||
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!preg_match_all('/[\t\s]*([a-z]+)=([^;]+);?/i', $headers['DKIM-Signature'], $matches))
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{
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$error = "Can't parse DKIM signature";
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return false;
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}
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$dkim = array_combine($matches[1], $matches[2]);
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if (array_diff(explode(':', $dkim['h']), explode(':', strtolower($verify_headers))))
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{
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$error = "Missing required headers h=$dkim[h]";
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return false;
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}
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// fetch public key
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if (!($dns = self::fetch_dns($dkim['d'], $dkim['s'])))
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{
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$error = "No public key for d='$dkim[d]' and s='$dkim[s]'";
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return false;
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}
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$public_key = "-----BEGIN PUBLIC KEY-----\n".chunk_split($dns['p'], 64, "\n")."-----END PUBLIC KEY-----\n";
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// create headers array
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$dkim_headers = array();
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foreach(explode(':', $verify_headers) as $header)
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{
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$dkim_headers[] = $header.': '.$headers[$header];
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}
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list($dkim_unsigned) = explode('b=', 'DKIM-Signature: '.$headers['DKIM-Signature']);
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$dkim_unsigned .= 'b=';
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// Canonicalization Header Data
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require_once EGW_API_INC.'/php-mail-domain-signer/lib/class.mailDomainSigner.php';
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$_unsigned = mailDomainSigner::headRelaxCanon(implode("\r\n", $dkim_headers). "\r\n".$dkim_unsigned);
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$ok = openssl_verify($_unsigned, base64_decode($dkim['b']), $public_key);
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switch($ok)
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{
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case -1:
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$error = 'Error while verifying DKIM';
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return false;
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case 0:
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$error = 'DKIM signature does NOT verify';
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error_log(__METHOD__."() unsigned='$_unsigned' $error");
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return false;
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}
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// Relax Canonicalization for Body
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$_b = mailDomainSigner::bodyRelaxCanon($body);
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// Hash of the canonicalized body [tag:bh]
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$_bh= base64_encode(sha1($_b,true));
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// check body hash
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if ($_bh != $dkim['bh'])
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{
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$error = 'Body hash does NOT verify';
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error_log(__METHOD__."() body-hash='$_bh' != '$dkim[bh]'=dkim-bh $error");
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return false;
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}
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return true;
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}
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/**
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* Fetch dns record and return parsed array
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*
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* @param string $domain
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* @param string $selector
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* @return array with values for keys parsed from eg. "v=DKIM1\;k=rsa\;h=sha1\;s=calendar\;t=s\;p=..."
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*/
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public static function fetch_dns($domain, $selector='calendar')
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{
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if (!($records = dns_get_record($host=$selector.'._domainkey.'.$domain, DNS_TXT))) return false;
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if (!isset($records[0]['text']) &&
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!preg_match_all('/[\t\s]*([a-z]+)=([^;]+);?/i', $records[0]['txt'], $matches))
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{
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return false;
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}
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return array_combine($matches[1], $matches[2]);
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}
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/**
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