basic requests can now use lan, work on lan client

src/httpapi/security/lan.py

@@ -0,0 +1,66 @@
+"""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