From 166879b8b04f8656a0ef105c319b8b4a82626bd9 Mon Sep 17 00:00:00 2001
From: zotlabs <mike@macgirvin.com>
Date: Mon, 6 Aug 2018 17:43:22 -0700
Subject: bring some Zot6 libraries and interfaces to red/hubzilla

---
 Zotlabs/Zot6/Receiver.php | 220 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 220 insertions(+)
 create mode 100644 Zotlabs/Zot6/Receiver.php

(limited to 'Zotlabs/Zot6/Receiver.php')

diff --git a/Zotlabs/Zot6/Receiver.php b/Zotlabs/Zot6/Receiver.php
new file mode 100644
index 000000000..4f26e2b0c
--- /dev/null
+++ b/Zotlabs/Zot6/Receiver.php
@@ -0,0 +1,220 @@
+<?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);
+		}
+	}
+
+}
+
+
+
-- 
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