''' Onionr - P2P Microblogging Platform & Social network This file handles all incoming http requests to the client, using Flask ''' ''' This program is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see . ''' import flask from flask import request, Response, abort from multiprocessing import Process from gevent.wsgi import WSGIServer import sys, random, threading, hmac, hashlib, base64, time, math, os, logger, config from core import Core from onionrblockapi import Block import onionrutils, onionrcrypto, blockimporter class API: ''' Main HTTP API (Flask) ''' def validateToken(self, token): ''' Validate that the client token matches the given token ''' try: if not hmac.compare_digest(self.clientToken, token): return False else: return True except TypeError: return False def __init__(self, debug): ''' Initialize the api server, preping variables for later use This initilization defines all of the API entry points and handlers for the endpoints and errors This also saves the used host (random localhost IP address) to the data folder in host.txt ''' config.reload() if config.get('dev_mode', True): self._developmentMode = True logger.set_level(logger.LEVEL_DEBUG) else: self._developmentMode = False logger.set_level(logger.LEVEL_INFO) self.debug = debug self._privateDelayTime = 3 self._core = Core() self._crypto = onionrcrypto.OnionrCrypto(self._core) self._utils = onionrutils.OnionrUtils(self._core) app = flask.Flask(__name__) bindPort = int(config.get('client.port', 59496)) self.bindPort = bindPort self.clientToken = config.get('client.hmac') self.timeBypassToken = base64.b16encode(os.urandom(32)).decode() self.i2pEnabled = config.get('i2p.host', False) self.mimeType = 'text/plain' with open('data/time-bypass.txt', 'w') as bypass: bypass.write(self.timeBypassToken) if not debug and not self._developmentMode: hostOctets = [127, random.randint(0x02, 0xFF), random.randint(0x02, 0xFF), random.randint(0x02, 0xFF)] self.host = '.'.join(hostOctets) else: self.host = '127.0.0.1' with open('data/host.txt', 'w') as file: file.write(self.host) @app.before_request def beforeReq(): ''' Simply define the request as not having yet failed, before every request. ''' self.requestFailed = False return @app.after_request def afterReq(resp): if not self.requestFailed: resp.headers['Access-Control-Allow-Origin'] = '*' #else: # resp.headers['server'] = 'Onionr' resp.headers['Content-Type'] = self.mimeType resp.headers["Content-Security-Policy"] = "default-src 'none'; script-src 'none'; object-src 'none'; style-src data: 'unsafe-inline'; img-src data:; media-src 'none'; frame-src 'none'; font-src 'none'; connect-src 'none'" resp.headers['X-Frame-Options'] = 'deny' resp.headers['X-Content-Type-Options'] = "nosniff" resp.headers['server'] = 'Onionr' # reset to text/plain to help prevent browser attacks if self.mimeType != 'text/plain': self.mimeType = 'text/plain' return resp @app.route('/client/') def private_handler(): if request.args.get('timingToken') is None: timingToken = '' else: timingToken = request.args.get('timingToken') data = request.args.get('data') try: data = data except: data = '' startTime = math.floor(time.time()) action = request.args.get('action') #if not self.debug: token = request.args.get('token') if not self.validateToken(token): abort(403) self.validateHost('private') if action == 'hello': resp = Response('Hello, World! ' + request.host) elif action == 'shutdown': # request.environ.get('werkzeug.server.shutdown')() self.http_server.stop() resp = Response('Goodbye') elif action == 'ping': resp = Response('pong') elif action == 'site': block = data siteData = self._core.getData(data) response = 'not found' if siteData != '' and siteData != False: self.mimeType = 'text/html' response = siteData.split(b'-', 2)[-1] resp = Response(response) else: resp = Response('(O_o) Dude what? (invalid command)') endTime = math.floor(time.time()) elapsed = endTime - startTime # if bypass token not used, delay response to prevent timing attacks if not hmac.compare_digest(timingToken, self.timeBypassToken): if elapsed < self._privateDelayTime: time.sleep(self._privateDelayTime - elapsed) return resp @app.route('/') def banner(): self.mimeType = 'text/html' self.validateHost('public') try: with open('static-data/index.html', 'r') as html: resp = Response(html.read()) except FileNotFoundError: resp = Response("") return resp @app.route('/public/upload/', methods=['POST']) def blockUpload(): self.validateHost('public') resp = 'failure' try: data = request.form['block'] except KeyError: logger.warn('No block specified for upload') pass else: if sys.getsizeof(data) < 100000000: if blockimporter.importBlockFromData(data, self._core): resp = 'success' else: logger.warn('Error encountered importing uploaded block') resp = Response(resp) return resp @app.route('/public/') def public_handler(): # Public means it is publicly network accessible self.validateHost('public') action = request.args.get('action') requestingPeer = request.args.get('myID') data = request.args.get('data') try: data = data except: data = '' if action == 'firstConnect': pass elif action == 'ping': resp = Response("pong!") elif action == 'getSymmetric': resp = Response(self._crypto.generateSymmetric()) elif action == 'getDBHash': resp = Response(self._utils.getBlockDBHash()) elif action == 'getBlockHashes': resp = Response('\n'.join(self._core.getBlockList())) elif action == 'directMessage': resp = Response(self._core.handle_direct_connection(data)) elif action == 'announce': if data != '': # TODO: require POW for this if self._core.addAddress(data): resp = Response('Success') else: resp = Response('') else: resp = Response('') # setData should be something the communicator initiates, not this api elif action == 'getData': resp = '' if self._utils.validateHash(data): if not os.path.exists('data/blocks/' + data + '.db'): block = Block(hash=data.encode(), core=self._core) resp = base64.b64encode(block.getRaw().encode()).decode() if len(resp) == 0: abort(404) resp = "" resp = Response(resp) elif action == 'pex': response = ','.join(self._core.listAdders()) if len(response) == 0: response = 'none' resp = Response(response) elif action == 'kex': peers = self._core.listPeers(getPow=True) response = ','.join(peers) resp = Response(response) else: resp = Response("") return resp @app.errorhandler(404) def notfound(err): self.requestFailed = True resp = Response("") return resp @app.errorhandler(403) def authFail(err): self.requestFailed = True resp = Response("403") return resp @app.errorhandler(401) def clientError(err): self.requestFailed = True resp = Response("Invalid request") return resp if not os.environ.get("WERKZEUG_RUN_MAIN") == "true": logger.info('Starting client on ' + self.host + ':' + str(bindPort) + '...', timestamp=False) try: self.http_server = WSGIServer((self.host, bindPort), app) self.http_server.serve_forever() except KeyboardInterrupt: pass #app.run(host=self.host, port=bindPort, debug=False, threaded=True) except Exception as e: logger.error(str(e)) logger.fatal('Failed to start client on ' + self.host + ':' + str(bindPort) + ', exiting...') exit(1) def validateHost(self, hostType): ''' Validate various features of the request including: If private (/client/), is the host header local? If public (/public/), is the host header onion or i2p? Was X-Request-With used? ''' if self.debug: return # Validate host header, to protect against DNS rebinding attacks host = self.host if hostType == 'private': if not request.host.startswith('127') and not self._utils.checkIsIP(request.host): abort(403) elif hostType == 'public': if not request.host.endswith('onion') and not request.host.endswith('i2p'): abort(403) # Validate x-requested-with, to protect against CSRF/metadata leaks if not self.i2pEnabled and request.host.endswith('i2p'): abort(403) if not self._developmentMode: try: request.headers['X-Requested-With'] except: # we exit rather than abort to avoid fingerprinting logger.debug('Avoiding fingerprinting, exiting...') sys.exit(1)