Fix compute authentication for websocket endpoints

gns3server/api/routes/compute/dependencies/authentication.py

@@ -15,12 +15,17 @@
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 import secrets
+import base64
+import binascii
+import logging
 
-from fastapi import Depends, HTTPException, status
+from fastapi import Depends, HTTPException, WebSocket, status
 from fastapi.security import HTTPBasic, HTTPBasicCredentials
+from fastapi.security.utils import get_authorization_scheme_param
 from gns3server.config import Config
-from typing import Optional
+from typing import Optional, Union
 
+log = logging.getLogger(__name__)
 security = HTTPBasic()
 
 
@@ -35,3 +40,44 @@ def compute_authentication(credentials: Optional[HTTPBasicCredentials] = Depends
             detail="Invalid compute username or password",
             headers={"WWW-Authenticate": "Basic"},
         )
+
+async def ws_compute_authentication(websocket: WebSocket) -> Union[None, WebSocket]:
+    """
+    """
+
+    await websocket.accept()
+
+    # handle basic HTTP authentication
+    invalid_user_credentials_exc = HTTPException(
+        status_code=status.HTTP_401_UNAUTHORIZED,
+        detail="Could not validate credentials",
+        headers={"WWW-Authenticate": "Basic"},
+    )
+
+    try:
+        authorization = websocket.headers.get("Authorization")
+        scheme, param = get_authorization_scheme_param(authorization)
+        if not authorization or scheme.lower() != "basic":
+            raise invalid_user_credentials_exc
+        try:
+            data = base64.b64decode(param).decode("ascii")
+        except (ValueError, UnicodeDecodeError, binascii.Error):
+            raise invalid_user_credentials_exc
+
+        username, separator, password = data.partition(":")
+        if not separator:
+            raise invalid_user_credentials_exc
+
+        server_settings = Config.instance().settings.Server
+        username = secrets.compare_digest(username, server_settings.compute_username)
+        password = secrets.compare_digest(password, server_settings.compute_password.get_secret_value())
+        if not (username and password):
+            raise invalid_user_credentials_exc
+
+    except HTTPException as e:
+        err_msg = f"Could not authenticate while connecting to compute WebSocket: {e.detail}"
+        websocket_error = {"action": "log.error", "event": {"message": err_msg}}
+        await websocket.send_json(websocket_error)
+        log.error(err_msg)
+        return await websocket.close(code=1008)
+    return websocket