Implement sideband authorization and credential provider architecture for
passwordless RDP access to Windows peers via NetBird.
Go components:
- Sideband RDP auth server (TCP on WG interface, port 3390/22023)
- Pending session store with TTL expiry and replay protection
- Named pipe IPC server (\\.\pipe\netbird-rdp-auth) for credential provider
- Sideband client for connecting peer to request authorization
- CLI command `netbird rdp [user@]host` with JWT auth flow
- Engine integration with DNAT port redirection
Rust credential provider DLL (client/rdp/credprov/):
- COM DLL implementing ICredentialProvider + ICredentialProviderCredential
- Loaded by Windows LogonUI.exe at the RDP login screen
- Queries NetBird agent via named pipe for pending sessions
- Performs S4U logon (LsaLogonUser) for passwordless Windows token creation
- Self-registration via regsvr32 (DllRegisterServer/DllUnregisterServer)
https://claude.ai/code/session_01C38bCDyYzLgxYLVwJkcUng
c5186f1483