# TeslaLauncher Project Memory

## Project Overview
Simulation cockpit launcher system (BattleTech/laser-tag venue).
Original: Windows 2000 app by Elsewhen Studios LLC.
Current: Modern .NET 6 rewrite to work around Session 0 isolation (Vista+).

## Architecture: 3 components
1. **TeslaLauncherService** (Session 0 Windows Service) - TCP 53290, handles Console commands, forwards via Named Pipe
2. **TeslaLauncherAgent** (WinForms tray, user desktop session) - Named Pipe server, launches/kills apps
3. **SecureConfig** (PodSecureConfigurator) - First-boot network configuration protocol

## Key Files
- `TeslaLauncherService.cs` + `.csproj` - Windows Service (net6.0-windows, x86, self-contained)
- `TeslaLauncherAgent.cs` + `.csproj` - Userspace Agent (WinForms, net6.0-windows, x86)
- `LaunchModels_Shared.cs` - BinaryFormatter wire types + JSON IPC types
- `SecureConfig.cs` - First-boot UDP beacon + AES configuration protocol
- `LaunchApps.xml` - Game configs (Red Planet 4.11, BattleTech Firestorm at C:\Games\)
- `build.bat` / `install.bat` - Build and install scripts

## Assets (original binaries)
- `assets/Tesla Application Launcher/` — original pod-side binaries (TeslaLauncherService.exe, TeslaSecureConfiguration.dll, etc.)
- `assets/Tesla Console/` — original console-side binaries (TeslaConsole.exe, TeslaSecureConfiguration.dll, etc.)
- `assets/configoflc.pcapng` — pcap of a SUCCESSFUL pod configuration (used to confirm protocol)
- `assets/pcap.pcapng` — pcap of a FAILING configuration (root cause: Console RPLY sent from wrong NIC)

## SecureConfig Protocol — CONFIRMED from binary (TeslaSecureConfiguration.dll)
All values below are verified from the original DLL.

### UDP Config Phase
- Port 53291: pod broadcasts RQST, Console listens
- Port 53292: Console broadcasts RPLY (UDP), pod listens
- RQST format: `RQST`(4 plaintext) + MAC(6) + RequestId(3) = 13 bytes PLAINTEXT
- RPLY format: `RPLY`(4 plaintext) + AES-256-CBC ciphertext(64 bytes) = 68 bytes
  - CBC ciphertext = IV(16) + PKCS7-padded plaintext(48)
  - AES key = PBKDF2(passphrase, salt, 1000 iter, 32 bytes)
  - Salt (32 bytes): 0x17,0xab,0x51,0xd9,0xec,0xd1,0xd4,0x74,0xa9,0x09,0x4a,0x34,0x27,0xfb,0x1f,0xf2,0xde,0xc4,0xf9,0xf1,0xa6,0xd8,0x9e,0xda,0x15,0x11,0x47,0x65,0x32,0xe7,0xe7,0xef
- Passphrase alphabet: "23456789ABCDEFGHJKLMNPQRSTUVWXYZ" (32 chars)
- RequestId length: 3 chars; Passphrase length: 5 chars
- Temp IP: RANDOM in 172.16.0.0/12 range (byte[0]=172, byte[1]=0x1X random, bytes 2-3 random)
  - Our fixed 172.16.0.100 is fine (Console doesn't connect back to temp IP)
- Temp mask: 255.240.0.0

### TCP Session Phase (port 53292) — CONFIRMED from DLL decompilation (ilspycmd)
- Console connects TCP to pod's NEW IP:53292 AFTER UDP config
- Both sides call the SAME `NegotiateCryptoStreams` static method:
1. Both write own 16-byte IV (raw), read other's 16-byte IV
2. OFB setup: outStream keyed from OTHER side's IV, inStream keyed from OWN IV
   - Pod writes with consoleIv, reads with podIv
   - Console writes with podIv, reads with consoleIv
3. Both write raw "CONF" (4 bytes: 0x43,0x4F,0x4E,0x46) over OFB
   Both read 4 bytes and verify == "CONF" → key verification handshake
   If mismatch → returns false → caller retries with new TCP connection
- After NegotiateCryptoStreams returns true:
4. Pod → Console: BinaryWriter.Write(string) — RSA-2048 public key XML (~417 bytes)
5. Console reads RSA XML, generates AES-256 session key, RSA-encrypts it
6. Console → Pod: BinaryWriter.Write(int len) + BinaryWriter.Write(byte[] ciphertext)
   (260 bytes = 4-byte int32 (256) + 256-byte RSA PKCS#1 v1.5 ciphertext)
7. Pod: ReadInt32() + ReadBytes(len) + RSA.Decrypt(enc, Pkcs1) → session key
- Key derivation: PBKDF2(passphrase, salt, 1000 iter, 32 bytes) — same key both directions
- OFBCryptoStream: unidirectional, constructor calls NextBuffer() immediately (IV→KS block 0)

### Registry / netsh
- Hostname: SYSTEM\CurrentControlSet\Control\ComputerName\ComputerName
- netsh: `interface ip set address "{adapter}" static {ip} {mask} {gw}` with ` 1` metric
- DNS: `interface ip set dns "{adapter}" static {dns}`

## BinaryFormatter Cross-Runtime Findings (.NET FW 2.0 → .NET 6)
- **MemberInfoSerializationHolder field names differ**: .NET FW 2.0 uses "Name", .NET 6 uses "MemberName"
- **MethodInfoProxy** intercepts via binder redirect + ISerializable, reads "Name" field
- **IObjectReference fixup fails for struct fields**: InvokeCommand is a struct; fixup doesn't update Function field in boxed value type. Fixed with [ThreadStatic] `LastResolvedName` fallback.
- **Console checks ICMP reachability** before connecting TCP 53290 — Windows Firewall must allow ICMPv4 type 8
- **BindToName** must write "TeslaConsoleLaunchLib" as assembly for Tesla.Net types in serialized responses
- **JsonElement not [Serializable]**: Agent IPC returns JsonElement via System.Text.Json; must convert to proper Tesla.Net types before BinaryFormatter serialization

## Known Bugs Found During Scan
1. ~~**CONFIG_FILE path mismatch**~~: Fixed
2. **IsMachineConfigured in Agent** doesn't filter virtual adapters (Service version does) - may false-trigger on Hyper-V machines
3. **`new Random()` for passphrase/RequestId generation** - should use RandomNumberGenerator (security)
4. **Named pipe has no PipeSecurity ACL** - any local process can connect and issue commands
5. **Volume control silently fails** if nircmd.exe not present - no fallback
6. ~~**`_clientTasks` list**~~: Fixed with _taskLock

## Wire Protocol
- Console → Service: TCP 53290, OFB-encrypted (NegotiateCryptoStreams + session key), BinaryFormatter RPC
- Service → Agent: JSON over Named Pipe "TeslaLauncherIPC" with 4-byte length prefix
- SecureConfig: UDP 53291 (RQST beacon), UDP 53292 (RPLY), TCP 53292 (OFB + RSA key exchange)

### Management Port (53290) — confirmed from decompiled TeslaLauncherService.exe
- Original: `ManagePort = 53290`, `ConfigPort = 53291`
- Every Console connection: NegotiateCryptoStreams(sessionKey) → BinaryFormatter RPC over OFB
- Session key: 32-byte AES key from RSA exchange during SecureConfig, saved to TeslaKeyStore.key
- Key file: `C:\ProgramData\TeslaLauncher\TeslaKeyStore.key` (format: 1-byte length + key bytes)
- Original Console: `PodManagerConnection.Open()` → `NegotiateCryptoStreams()` → `BinaryFormatter.Serialize/Deserialize`

## Install Product Protocol (confirmed from old pod pcap)
- Console uses TWO concurrent TCP 53290 connections:
  - **Polling connection**: GetInstalledApps, then GetOutOfBandProgress polling (~4/sec), then InstallApp
  - **Install connection**: InitiateInstallProduct → Guid response, then 8-byte Int64 LE file size + raw file bytes, then FIN
- Service handles InitiateInstallProduct and GetOutOfBandProgress directly (not forwarded to Agent)
- Progress tracking: receive (0-50%), extract to C:\Games (50-95%), postinstall.bat (96%), complete (100%)
- Zip-slip protection on extraction; postinstall.bat executed with 60s timeout then deleted
- **FIXED**: Console sent file 3x because `InstallProductWorker` loops `for (i=0; i<3; i++)` and only breaks on `PercentComplete == 99`. We were returning 100 → now returns 99.

## Fixes Applied (session 2)
- **Agent splash-to-normal transition**: form.Close() in timer + Main() falls through to AgentApplication
- **Guid format mismatch**: string-first deserialization with TryParse (moot after moving to Service)
- **InitiateInstallProduct**: handled directly in Service, returns Guid, triggers ReceiveInstallFile
- **LaunchApps.xml ACL**: icacls in install.bat grants Users modify access
- **build.bat /q flag**: suppresses pause for non-interactive terminals
- **install.bat**: creates C:\Games with Users modify ACL

## User Preferences
- User writes in informal English, technical background
- Prefers building via build.bat (not direct dotnet publish)