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-rw-r--r--Zotlabs/Zot6/Receiver.php220
1 files changed, 220 insertions, 0 deletions
diff --git a/Zotlabs/Zot6/Receiver.php b/Zotlabs/Zot6/Receiver.php
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+++ b/Zotlabs/Zot6/Receiver.php
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+<?php
+
+namespace Zotlabs\Zot6;
+
+use Zotlabs\Lib\Config;
+use Zotlabs\Lib\Libzot;
+use Zotlabs\Web\HTTPSig;
+
+class Receiver {
+
+ protected $data;
+ protected $encrypted;
+ protected $error;
+ protected $messagetype;
+ protected $sender;
+ protected $site_id;
+ protected $validated;
+ protected $recipients;
+ protected $response;
+ protected $handler;
+ protected $prvkey;
+ protected $rawdata;
+ protected $sigdata;
+
+ function __construct($handler, $localdata = null) {
+
+ $this->error = false;
+ $this->validated = false;
+ $this->messagetype = '';
+ $this->response = [ 'success' => false ];
+ $this->handler = $handler;
+ $this->data = null;
+ $this->rawdata = null;
+ $this->site_id = null;
+ $this->prvkey = Config::get('system','prvkey');
+
+ if($localdata) {
+ $this->rawdata = $localdata;
+ }
+ else {
+ $this->rawdata = file_get_contents('php://input');
+
+ // All access to the zot endpoint must use http signatures
+
+ if (! $this->Valid_Httpsig()) {
+ logger('signature failed');
+ $this->error = true;
+ $this->response['message'] = 'signature invalid';
+ return;
+ }
+ }
+
+ logger('received raw: ' . print_r($this->rawdata,true), LOGGER_DATA);
+
+
+ if ($this->rawdata) {
+ $this->data = json_decode($this->rawdata,true);
+ }
+ else {
+ $this->error = true;
+ $this->response['message'] = 'no data';
+ }
+
+ logger('received_json: ' . json_encode($this->data,JSON_PRETTY_PRINT|JSON_UNESCAPED_SLASHES), LOGGER_DATA);
+
+ logger('received: ' . print_r($this->data,true), LOGGER_DATA);
+
+ if ($this->data && is_array($this->data)) {
+ $this->encrypted = ((array_key_exists('encrypted',$this->data) && intval($this->data['encrypted'])) ? true : false);
+
+ if ($this->encrypted && $this->prvkey) {
+ $uncrypted = crypto_unencapsulate($this->data,$this->prvkey);
+ if ($uncrypted) {
+ $this->data = json_decode($uncrypted,true);
+ }
+ else {
+ $this->error = true;
+ $this->response['message'] = 'no data';
+ }
+ }
+ }
+ }
+
+
+ function run() {
+
+ if ($this->error) {
+ // make timing attacks on the decryption engine a bit more difficult
+ usleep(mt_rand(10000,100000));
+ return($this->response);
+ }
+
+ if ($this->data) {
+ if (array_key_exists('type',$this->data)) {
+ $this->messagetype = $this->data['type'];
+ }
+
+ if (! $this->messagetype) {
+ $this->error = true;
+ $this->response['message'] = 'no datatype';
+ return $this->response;
+ }
+
+ $this->sender = ((array_key_exists('sender',$this->data)) ? $this->data['sender'] : null);
+ $this->recipients = ((array_key_exists('recipients',$this->data)) ? $this->data['recipients'] : null);
+ $this->site_id = ((array_key_exists('site_id',$this->data)) ? $this->data['site_id'] : null);
+ }
+
+ if ($this->sender) {
+ $result = $this->ValidateSender();
+ if (! $result) {
+ $this->error = true;
+ return $this->response;
+ }
+ }
+
+ return $this->Dispatch();
+ }
+
+ function ValidateSender() {
+
+ $hub = Libzot::valid_hub($this->sender,$this->site_id);
+
+ if (! $hub) {
+ $x = Libzot::register_hub($this->sigdata['signer']);
+ if($x['success']) {
+ $hub = Libzot::valid_hub($this->sender,$this->site_id);
+ }
+ if(! $hub) {
+ $this->response['message'] = 'sender unknown';
+ return false;
+ }
+ }
+
+ if (! check_siteallowed($hub['hubloc_url'])) {
+ $this->response['message'] = 'forbidden';
+ return false;
+ }
+
+ if (! check_channelallowed($this->sender)) {
+ $this->response['message'] = 'forbidden';
+ return false;
+ }
+
+ Libzot::update_hub_connected($hub,$this->site_id);
+
+ $this->validated = true;
+ $this->hub = $hub;
+ return true;
+ }
+
+
+ function Valid_Httpsig() {
+
+ $result = false;
+
+ $this->sigdata = HTTPSig::verify($this->rawdata);
+
+ if ($this->sigdata && $this->sigdata['header_signed'] && $this->sigdata['header_valid']) {
+ $result = true;
+
+ // It is OK to not have signed content - not all messages provide content.
+ // But if it is signed, it has to be valid
+
+ if (($this->sigdata['content_signed']) && (! $this->sigdata['content_valid'])) {
+ $result = false;
+ }
+ }
+ return $result;
+ }
+
+ function Dispatch() {
+
+ switch ($this->messagetype) {
+
+ case 'request':
+ $this->response = $this->handler->Request($this->data,$this->hub);
+ break;
+
+ case 'purge':
+ $this->response = $this->handler->Purge($this->sender,$this->recipients,$this->hub);
+ break;
+
+ case 'refresh':
+ $this->response = $this->handler->Refresh($this->sender,$this->recipients,$this->hub);
+ break;
+
+ case 'rekey':
+ $this->response = $this->handler->Rekey($this->sender, $this->data,$this->hub);
+ break;
+
+ case 'activity':
+ case 'response': // upstream message
+ case 'sync':
+ default:
+ $this->response = $this->handler->Notify($this->data,$this->hub);
+ break;
+
+ }
+
+ logger('response_to_return: ' . print_r($this->response,true),LOGGER_DATA);
+
+ if ($this->encrypted) {
+ $this->EncryptResponse();
+ }
+
+ return($this->response);
+ }
+
+ function EncryptResponse() {
+ $algorithm = Libzot::best_algorithm($this->hub['site_crypto']);
+ if ($algorithm) {
+ $this->response = crypto_encapsulate(json_encode($this->response),$this->hub['hubloc_sitekey'], $algorithm);
+ }
+ }
+
+}
+
+
+