launcher: named pipe SDDL

src/launcher/launcher.c

@@ -16,6 +16,7 @@
  */
 
 #include <launcher/launcher.h>
+#include <sddl.h>
 
 #define PROGNAME                        "WinFsp-Launcher"
 #define REGKEY                          "SYSTEM\\CurrentControlSet\\Services\\" PROGNAME "\\Services"
@@ -356,8 +357,16 @@ static VOID SvcPipeTransact(PWSTR PipeBuf, PULONG PSize);
 
 static NTSTATUS SvcStart(FSP_SERVICE *Service, ULONG argc, PWSTR *argv)
 {
+    SECURITY_ATTRIBUTES SecurityAttributes = { 0 };
+
     InitializeCriticalSection(&SvcInstanceLock);
 
+    SecurityAttributes.nLength = sizeof SecurityAttributes;
+    SecurityAttributes.bInheritHandle = FALSE;
+    if (!ConvertStringSecurityDescriptorToSecurityDescriptorW(L"" PIPE_SDDL, SDDL_REVISION_1,
+        &SecurityAttributes.lpSecurityDescriptor, 0))
+        goto fail;
+
     SvcEvent = CreateEventW(0, TRUE, FALSE, 0);
     if (0 == SvcEvent)
         goto fail;
@@ -378,6 +387,8 @@ static NTSTATUS SvcStart(FSP_SERVICE *Service, ULONG argc, PWSTR *argv)
     if (0 == SvcThread)
         goto fail;
 
+    LocalFree(SecurityAttributes.lpSecurityDescriptor);
+
     return STATUS_SUCCESS;
 
 fail:
@@ -395,6 +406,8 @@ fail:
     if (0 != SvcEvent)
         CloseHandle(SvcEvent);
 
+    LocalFree(SecurityAttributes.lpSecurityDescriptor);
+
     DeleteCriticalSection(&SvcInstanceLock);
 
     return FspNtStatusFromWin32(LastError);

src/launcher/launcher.h

@@ -22,6 +22,7 @@
 #include <shared/minimal.h>
 
 #define PIPE_NAME                       "\\\\.\\pipe\\WinFsp.{14E7137D-22B4-437A-B0C1-D21D1BDF3767}"
+#define PIPE_SDDL                       "O:SYG:SYD:P(A;;GA;;;WD)"
 #define PIPE_BUFFER_SIZE                2048
 #define PIPE_DEFAULT_TIMEOUT            3000