Onionr/onionr/httpapi/security/public.py

61 lines
2.7 KiB
Python

'''
Onionr - Private P2P Communication
Process incoming requests to the public api server for certain attacks
'''
'''
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 <https://www.gnu.org/licenses/>.
'''
from flask import Blueprint, request, abort, g
from onionrservices import httpheaders
from onionrutils import epoch
from utils import gettransports
class PublicAPISecurity:
def __init__(self, public_api):
public_api_security_bp = Blueprint('publicapisecurity', __name__)
self.public_api_security_bp = public_api_security_bp
@public_api_security_bp.before_app_request
def validate_request():
'''Validate request has the correct hostname'''
# If high security level, deny requests to public (HS should be disabled anyway for Tor, but might not be for I2P)
transports = gettransports.get()
if public_api.config.get('general.security_level', default=1) > 0:
abort(403)
if request.host not in transports:
# Disallow connection if wrong HTTP hostname, in order to prevent DNS rebinding attacks
abort(403)
public_api.hitCount += 1 # raise hit count for valid requests
try:
if 'onionr' in request.headers['User-Agent'].lower():
g.is_onionr_client = True
else:
g.is_onionr_client = False
except KeyError:
g.is_onionr_client = False
@public_api_security_bp.after_app_request
def send_headers(resp):
'''Send api, access control headers'''
resp = httpheaders.set_default_onionr_http_headers(resp)
# Network API version
resp.headers['X-API'] = public_api.API_VERSION
# Delete some HTTP headers for Onionr user agents
NON_NETWORK_HEADERS = ('Content-Security-Policy', 'X-Frame-Options',
'X-Content-Type-Options', 'Feature-Policy', 'Clear-Site-Data', 'Referrer-Policy')
if g.is_onionr_client:
for header in NON_NETWORK_HEADERS: del resp.headers[header]
public_api.lastRequest = epoch.get_rounded_epoch(roundS=5)
return resp