Setting lpDesktop on STARTUPINFO forces the child to open that desktop;
the LogonUser-derived token in SpecificUser mode usually cannot, since
winsta0\default's DACL only grants the currently-logged-in user. The
result was STATUS_DLL_INIT_FAILED (exit 0xC0000142) with empty stdio.
Only InteractiveUser mode needs the explicit interactive desktop -
that whole point of the mode is to land in the user's session. For
SpecificUser, leaving lpDesktop null lets the child inherit our
service desktop, which works for headless batch tasks (AD reads, file
ops, etc.).
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
CreateProcessWithLogonW (which ProcessStartInfo.UserName/Password uses
under the hood) refuses to run when the caller is LocalSystem - which
is exactly the scenario every hook hits, since the service runs as
SYSTEM by default. The hook just got "Access is denied" with no useful
context.
Switch SpecificUser to the same LogonUser + DuplicateTokenEx +
CreateProcessAsUser path that InteractiveUser already uses. The
launcher tries LOGON32_LOGON_INTERACTIVE first, falling back to
LOGON32_LOGON_BATCH for accounts without interactive-logon rights
(typical for service-only users). Domain "." is normalized to the
machine name so ".\justin" works.
The launcher's two public entry points - LaunchAsActiveConsoleUser
and LaunchAsSpecificUser - share the same LaunchWithToken core, so
stdio capture and environment-block construction stay identical.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Native per-endpoint identity instead of the schtasks bridge:
- Service (default) keeps the existing path - hooks inherit the service
account (SYSTEM by default, or whatever you installed under).
- SpecificUser binds ProcessStartInfo.UserName / Password / Domain so
the hook runs in a batch logon session as the named account. Useful
for AD-write hooks that should NOT run as SYSTEM.
- InteractiveUser uses WTSQueryUserToken(WTSGetActiveConsoleSessionId)
+ DuplicateTokenEx + CreateProcessAsUser to drop the child into the
logged-in user's session with their environment block. This is the
real fix for "calc.exe should pop up on my desktop" - no Task
Scheduler bridge required. Stdio is captured via inheritable
anonymous pipes so the hook still returns stdout/stderr to the
caller normally.
Implementation:
- New RunAsMode enum + RunAsConfig model on EndpointConfig
- ConfigStore round-trips RunAs.Password through DPAPI alongside
bearer/HMAC/PFX secrets
- AdminPipeServer's secret-merge logic preserves the encrypted blob
when the GUI saves an endpoint without re-typing the password
- New WebhookServer.Core.Execution.Native namespace with NativeMethods
(P/Invoke) and InteractiveProcessLauncher (token-based launcher)
- ProcessExecutor branches on RunAs.Mode; the Service/SpecificUser
paths share .NET's Process; InteractiveUser uses the launcher
- GUI editor gets a "Run as" section: dropdown + conditional
username/password/load-profile fields under SpecificUser
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
justin