89 lines
3.7 KiB
Python
89 lines
3.7 KiB
Python
"""Onionr - Private P2P Communication.
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Process incoming requests to the public api server for certain attacks
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"""
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from flask import Blueprint, request, abort, g
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from httpapi import httpheaders
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from onionrutils import epoch
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from utils import gettransports
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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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class PublicAPISecurity:
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def __init__(self, public_api):
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public_api_security_bp = Blueprint('publicapisecurity', __name__)
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self.public_api_security_bp = public_api_security_bp
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@public_api_security_bp.before_app_request
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def validate_request():
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"""Validate request has the correct hostname"""
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# If high security level, deny requests to public
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# (HS should be disabled anyway for Tor, but might not be for I2P)
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g.is_onionr_client = False
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transports = gettransports.get()
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if public_api.config.get('general.security_level', default=1) > 0:
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abort(403)
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if request.host not in transports:
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# Abort conn if wrong HTTP hostname, to prevent DNS rebinding
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if not public_api.config.get(
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'general.allow_public_api_dns_rebinding', False):
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abort(403)
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public_api.hitCount += 1 # raise hit count for valid requests
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try:
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if 'onionr' in request.headers['User-Agent'].lower():
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g.is_onionr_client = True
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else:
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g.is_onionr_client = False
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except KeyError:
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g.is_onionr_client = False
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# Add shared objects
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try:
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g.too_many = public_api._too_many
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except KeyError:
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g.too_many = None
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@public_api_security_bp.after_app_request
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def send_headers(resp):
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"""Send api, access control headers"""
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resp = httpheaders.set_default_onionr_http_headers(resp)
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# Network API version
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resp.headers['X-API'] = public_api.API_VERSION
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resp.headers['Access-Control-Allow-Origin'] = "*"
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resp.headers['Access-Control-Allow-Headers'] = "*"
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resp.headers['Access-Control-Allow-Methods'] = "POST, GET, OPTIONS"
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# Delete some HTTP headers for Onionr user agents
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NON_NETWORK_HEADERS = (
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'Content-Security-Policy', 'X-Frame-Options',
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'X-Content-Type-Options', 'Feature-Policy',
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'Clear-Site-Data', 'Referrer-Policy',
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'Access-Control-Allow-Origin', 'Access-Control-Allow-Headers',
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'Access-Control-Allow-Methods')
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# For other nodes, we don't need to waste bits on the above headers
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try:
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if g.is_onionr_client:
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for header in NON_NETWORK_HEADERS:
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del resp.headers[header]
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else:
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del resp.headers['X-API']
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except AttributeError:
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abort(403)
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public_api.lastRequest = epoch.get_rounded_epoch(roundS=5)
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return resp
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