fix error on windows server

Author: sxul

go.mod

@@ -17,5 +17,5 @@ require (
 	github.com/lxn/win v0.0.0-20181015143721-a7f87360b10e
 	github.com/oxtoacart/bpool v0.0.0-20190227141107-8c4636f812cc // indirect
 	github.com/stretchr/testify v1.3.0 // indirect
-	golang.org/x/sys v0.0.0-20190405154228-4b34438f7a67
+	golang.org/x/sys v0.0.0-20200317113312-5766fd39f98d
 )

go.sum

@@ -35,3 +35,5 @@ github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
 golang.org/x/sys v0.0.0-20190405154228-4b34438f7a67 h1:1Fzlr8kkDLQwqMP8GxrhptBLqZG/EDpiATneiZHY998=
 golang.org/x/sys v0.0.0-20190405154228-4b34438f7a67/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200317113312-5766fd39f98d h1:62ap6LNOjDU6uGmKXHJbSfciMoV+FeI1sRXx/pLDL44=
+golang.org/x/sys v0.0.0-20200317113312-5766fd39f98d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=

main.go

@@ -13,6 +13,7 @@ import (
 	"net"
 	"os"
 	"os/signal"
+	"os/user"
 	"reflect"
 	"sync"
 	"syscall"
@@ -53,8 +54,34 @@ type copyDataStruct struct {
 	lpData uintptr
 }
 
+type SecurityAttributes struct {
+	Length             uint32
+	SecurityDescriptor uintptr
+	InheritHandle      uint32
+}
+
 var queryPageantMutex sync.Mutex
 
+func makeInheritSaWithSid() *windows.SecurityAttributes {
+	var sa windows.SecurityAttributes
+
+	u, err := user.Current()
+
+	if err == nil {
+		sd, err := windows.SecurityDescriptorFromString("O:" + u.Uid)
+		if err == nil {
+			sa.SecurityDescriptor = sd
+		}
+	}
+
+	sa.Length = uint32(unsafe.Sizeof(sa))
+
+	sa.InheritHandle = 1
+
+	return &sa
+
+}
+
 func queryPageant(buf []byte) (result []byte, err error) {
 	if len(buf) > agentMaxMessageLength {
 		err = errors.New("Message too long")
@@ -75,7 +102,9 @@ func queryPageant(buf []byte) (result []byte, err error) {
 	mapName := fmt.Sprintf("WSLPageantRequest")
 	queryPageantMutex.Lock()
 
-	fileMap, err := windows.CreateFileMapping(invalidHandleValue, nil, pageReadWrite, 0, agentMaxMessageLength, syscall.StringToUTF16Ptr(mapName))
+	var sa = makeInheritSaWithSid()
+
+	fileMap, err := windows.CreateFileMapping(invalidHandleValue, sa, pageReadWrite, 0, agentMaxMessageLength, syscall.StringToUTF16Ptr(mapName))
 	if err != nil {
 		queryPageantMutex.Unlock()
 		return