109 lines
4.4 KiB
Python
109 lines
4.4 KiB
Python
"""Onionr - Private P2P Communication.
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Process incoming requests to the client api server to validate
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that they are legitimate and not DNSR/XSRF or other local adversary
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"""
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from ipaddress import ip_address
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import hmac
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from flask import Blueprint, request, abort, g
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from httpapi import httpheaders
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from . import pluginwhitelist
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import config
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import logger
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"""
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>.
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"""
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# Be extremely mindful of this.
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# These are endpoints available without a password
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whitelist_endpoints = [
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'www', 'staticfiles.homedata',
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'staticfiles.sharedContent',
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'staticfiles.friends', 'staticfiles.friendsindex', 'siteapi.site',
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'siteapi.siteFile', 'staticfiles.onionrhome',
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'themes.getTheme', 'staticfiles.onboarding', 'staticfiles.onboardingIndex']
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remote_safe_whitelist = ['www', 'staticfiles']
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public_remote_enabled = config.get('ui.public_remote_enabled', False)
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public_remote_hostnames = config.get('ui.public_remote_hosts', [])
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class ClientAPISecurity:
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def __init__(self, client_api):
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client_api_security_bp = Blueprint('clientapisecurity', __name__)
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self.client_api_security_bp = client_api_security_bp
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self.client_api = client_api
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pluginwhitelist.load_plugin_security_whitelist_endpoints(
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whitelist_endpoints)
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@client_api_security_bp.before_app_request
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def validate_request():
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"""Validate request has set password & is the correct hostname."""
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# For the purpose of preventing DNS rebinding attacks
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if ip_address(client_api.host).is_loopback:
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localhost = True
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if request.host != '%s:%s' % \
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(client_api.host, client_api.bindPort):
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localhost = False
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if not localhost and public_remote_enabled:
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if request.host not in public_remote_hostnames:
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logger.warn(
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f'{request.host} not in {public_remote_hostnames}')
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abort(403)
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else:
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if not localhost:
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logger.warn(
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f'Possible DNS rebinding attack by {request.host}')
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abort(403)
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# Add shared objects
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try:
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g.too_many = self.client_api._too_many
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except KeyError:
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g.too_many = None
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# Static files for Onionr sites
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if request.path.startswith('/site/'):
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return
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if request.endpoint in whitelist_endpoints:
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return
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try:
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if not hmac.compare_digest(
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request.headers['token'], client_api.clientToken):
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if not hmac.compare_digest(
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request.form['token'], client_api.clientToken):
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abort(403)
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except KeyError:
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if not hmac.compare_digest(
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request.form['token'], client_api.clientToken):
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abort(403)
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@client_api_security_bp.after_app_request
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def after_req(resp):
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# Security headers
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resp = httpheaders.set_default_onionr_http_headers(resp)
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if request.endpoint in ('siteapi.site', 'siteapi.siteFile'):
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resp.headers['Content-Security-Policy'] = \
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"default-src 'none'; style-src 'self' data: 'unsafe-inline'; img-src 'self' data:; media-src 'self' data:" # noqa
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else:
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resp.headers['Content-Security-Policy'] = \
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"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
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return resp
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