Network,TorHandshakes: handle handshake fail

Previously, TorHandshakes used failwith to raise handshake failed error. Since we need to catch it, as a result of replacing generic try-with which lead to a red CI in the PR, we had to define its special excpetion and catch that. ``` The active test run was aborted. Reason: Test host process crashed : Unhandled exception. System.Exception: Key handshake failed! at NOnion.TorHandshakes.NTorHandshake.NOnion-TorHandshakes-IHandshake-GenerateKdfResult(ICreatedCell serverSideData) in /home/runner/work/NOnion/NOnion/NOnion/TorHandshakes/NTorHandshake.fs:line 112 at <StartupCode$NOnion>[email protected](Unit unitVar) in /home/runner/work/NOnion/NOnion/NOnion/Network/TorCircuit.fs:line 352 at Microsoft.FSharp.Control.AsyncPrimitives.CallThenInvoke[T,TResult](AsyncActivation`1 ctxt, TResult result1, FSharpFunc`2 part2) in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\async.fs:line 398 at NOnion.Utility.MailboxResultUtil.TryExecuteAsyncAndReplyAsResult@25-3.Invoke(AsyncActivation`1 ctxt) in /home/runner/work/NOnion/NOnion/NOnion/Utility/MailboxUtil.fs:line 25 at NOnion.Utility.MailboxResultUtil.TryExecuteAsyncAndReplyAsResult@24-6.Invoke(AsyncActivation`1 ctxt) in /home/runner/work/NOnion/NOnion/NOnion/Utility/MailboxUtil.fs:line 24 at <StartupCode$NOnion>[email protected](AsyncActivation`1 ctxt) in /home/runner/work/NOnion/NOnion/NOnion/Network/TorCircuit.fs:line 965 at <StartupCode$NOnion>[email protected](AsyncActivation`1 ctxt) in /home/runner/work/NOnion/NOnion/NOnion/Network/TorCircuit.fs:line 950 at <StartupCode$FSharp-Core>[email protected](AsyncActivation`1 ctxt) in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\mailbox.fs:line 303 at Microsoft.FSharp.Control.Trampoline.Execute(FSharpFunc`2 firstAction) in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\async.fs:line 109 --- End of stack trace from previous location where exception was thrown --- at [email protected](ExceptionDispatchInfo edi) in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\async.fs:line 907 at Microsoft.FSharp.Control.Trampoline.Execute(FSharpFunc`2 firstAction) in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\async.fs:line 109 at <StartupCode$FSharp-Core>[email protected](Object o) in F:\workspace\_work\1\s\src\fsharp\FSharp.Core\async.fs:line 165 at System.Threading.QueueUserWorkItemCallback.Execute() at System.Threading.ThreadPoolWorkQueue.Dispatch() ```
nblockchain · Nov 23, 2022 · 0572f20 · 0572f20
1 parent d16f92f
commit 0572f20
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Showing 4 changed files with 24 additions and 9 deletions.
diff --git a/NOnion/Exceptions.fs b/NOnion/Exceptions.fs
@@ -29,6 +29,9 @@ type CircuitDestroyedException internal (reason: DestroyReason) =
 type CircuitDecryptionFailedException internal () =
     inherit NOnionException(sprintf "Circuit Decryption Failed")
 
+type HandshakeFailedException internal () =
+    inherit NOnionException(sprintf "Key handshake failed!")
+
 type TimeoutErrorException internal () =
     inherit NOnionException("Time limit exceeded for operation")
 

diff --git a/NOnion/Network/TorGuard.fs b/NOnion/Network/TorGuard.fs
@@ -193,6 +193,18 @@ type TorGuard private (client: TcpClient, sslStream: SslStream) =
     member self.SendAsync (circuidId: uint16) (cellToSend: ICell) =
         self.Send circuidId cellToSend |> Async.StartAsTask
 
+    member private self.HandleIncomingCellException<'T when 'T :> NOnionException>
+        (cell: ICell)
+        (ex: 'T)
+        =
+        sprintf
+            "TorGuard: exception when trying to handle incoming cell type=%i, ex=%s"
+            cell.Command
+            (ex.ToString())
+        |> TorLogger.Log
+
+        self.KillChildCircuits()
+
     member private __.ReceiveInternal() =
         async {
             (*
@@ -332,14 +344,14 @@ type TorGuard private (client: TcpClient, sslStream: SslStream) =
                             try
                                 do! circuit.HandleIncomingCell cell
                             with
+                            | :? HandshakeFailedException as ex ->
+                                self.HandleIncomingCellException<HandshakeFailedException>
+                                    cell
+                                    ex
                             | :? CircuitDecryptionFailedException as ex ->
-                                sprintf
-                                    "TorGuard: exception when trying to handle incoming cell type=%i, ex=%s"
-                                    cell.Command
-                                    (ex.ToString())
-                                |> TorLogger.Log
-
-                                self.KillChildCircuits()
+                                self.HandleIncomingCellException<CircuitDecryptionFailedException>
+                                    cell
+                                    ex
                             | ex -> return raise <| FSharpUtil.ReRaise ex
                         | None ->
                             self.KillChildCircuits()

diff --git a/NOnion/TorHandshakes/FastHandshake.fs b/NOnion/TorHandshakes/FastHandshake.fs
@@ -36,6 +36,6 @@ type FastHandshake =
                 |> Kdf.ComputeLegacyKdf
 
             if kdfResult.KeyHandshake <> serverSideData.DerivativeKey then
-                failwith "Key handshake failed!"
+                raise <| HandshakeFailedException()
             else
                 kdfResult
diff --git a/NOnion/TorHandshakes/NTorHandshake.fs b/NOnion/TorHandshakes/NTorHandshake.fs
@@ -107,6 +107,6 @@ type NTorHandshake =
             let auth = calculateHmacSha256 authInput Constants.NTorTMac
 
             if auth <> serverSideData.DerivativeKey then
-                failwith "Key handshake failed!"
+                raise <| HandshakeFailedException()
             else
                 Kdf.ComputeRfc5869Kdf secretInput