"""Onionr - Private P2P Communication. Process incoming requests to the client api server to validate that they are legitimate and not DNSR/XSRF or other local adversary """ import hmac from flask import Blueprint, request, abort, g from httpapi import httpheaders from . import pluginwhitelist import config import logger """ 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 . """ # Be extremely mindful of this. # These are endpoints available without a password whitelist_endpoints = [ 'www', 'staticfiles.homedata', 'staticfiles.sharedContent', 'staticfiles.friends', 'staticfiles.friendsindex', 'siteapi.site', 'siteapi.siteFile', 'staticfiles.onionrhome', 'themes.getTheme', 'staticfiles.onboarding', 'staticfiles.onboardingIndex'] remote_safe_whitelist = ['www', 'staticfiles'] public_remote_enabled = config.get('ui.public_remote_enabled', False) public_remote_hostnames = config.get('ui.public_remote_hosts', []) class ClientAPISecurity: def __init__(self, client_api): client_api_security_bp = Blueprint('clientapisecurity', __name__) self.client_api_security_bp = client_api_security_bp self.client_api = client_api pluginwhitelist.load_plugin_security_whitelist_endpoints( whitelist_endpoints) @client_api_security_bp.before_app_request def validate_request(): """Validate request has set password & is the correct hostname.""" # For the purpose of preventing DNS rebinding attacks localhost = True if client_api.host != '0.0.0.0': if request.host != '%s:%s' % \ (client_api.host, client_api.bindPort): localhost = False if not localhost and public_remote_enabled: if request.host not in public_remote_hostnames: logger.warn( f'{request.host} not in {public_remote_hostnames}') abort(403) else: if not localhost: logger.warn( f'Possible DNS rebinding attack by {request.host}') abort(403) # Add shared objects try: g.too_many = self.client_api._too_many except KeyError: g.too_many = None # Static files for Onionr sites if request.path.startswith('/site/'): return if request.endpoint in whitelist_endpoints: return try: if not hmac.compare_digest( request.headers['token'], client_api.clientToken): if not hmac.compare_digest( request.form['token'], client_api.clientToken): abort(403) except KeyError: if not hmac.compare_digest( request.form['token'], client_api.clientToken): abort(403) @client_api_security_bp.after_app_request def after_req(resp): # Security headers resp = httpheaders.set_default_onionr_http_headers(resp) if request.endpoint in ('siteapi.site', 'siteapi.siteFile'): resp.headers['Content-Security-Policy'] = \ "default-src 'none'; style-src 'self' data: 'unsafe-inline'; img-src 'self' data:; media-src 'self' data:" # noqa else: resp.headers['Content-Security-Policy'] = \ "default-src 'none'; script-src 'self'; object-src 'none'; style-src 'self' 'unsafe-inline'; img-src 'self' data:; media-src 'self'; frame-src 'none'; font-src 'self'; connect-src 'self'" # noqa return resp