# Module `onionr.httpapi.security.public`

Onionr - Private P2P Communication

Process incoming requests to the public api server for certain attacks

Source code

    '''
        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

## Classes

`class PublicAPISecurity (public_api)`
  Source code

      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