Onionr/src/httpapi/security/lan.py

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"""Onionr - Private P2P Communication.
Process incoming requests to the public api server for certain attacks
"""
from flask import Blueprint, request, abort, g
from onionrservices import httpheaders
from onionrutils import epoch
from lan import getip
"""
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/>.
"""
class LANAPISecurity:
def __init__(self, lan_client):
lan_api_security_bp = Blueprint('lanapisecurity', __name__)
self.lan_api_security_bp = lan_api_security_bp
@lan_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 = getip.lan_ips
if lan_client.config.get('general.security_level', default=1) > 0:
abort(403)
if request.host not in transports:
# Abort conn if wrong HTTP hostname, to prevent DNS rebinding
abort(403)
lan_client.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
@lan_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'] = lan_client.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')
try:
if g.is_onionr_client:
for header in NON_NETWORK_HEADERS: del resp.headers[header]
except AttributeError:
abort(403)
lan_client.lastRequest = epoch.get_rounded_epoch(roundS=5)
return resp