cmd/go: add TestACL

Add test that verifies that go command produces executable
that have security attributes of the target directory.

Update #22343

Change-Id: Ieab02381927a2b09bee21c49c043b3298bd088e6
Reviewed-on: https://go-review.googlesource.com/78215Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/cmd/go/go_windows_test.go

@@ -5,12 +5,14 @@
 package main
 
 import (
+	"fmt"
 	"internal/testenv"
 	"io/ioutil"
 	"os"
 	"os/exec"
 	"path/filepath"
 	"strings"
+	"syscall"
 	"testing"
 )
 
@@ -54,3 +56,82 @@ func TestAbsolutePath(t *testing.T) {
 		t.Fatalf("wrong output found: %v %v", err, string(output))
 	}
 }
+
+func isWindowsXP(t *testing.T) bool {
+	v, err := syscall.GetVersion()
+	if err != nil {
+		t.Fatalf("GetVersion failed: %v", err)
+	}
+	major := byte(v)
+	return major < 6
+}
+
+func runIcacls(t *testing.T, args ...string) string {
+	t.Helper()
+	out, err := exec.Command("icacls", args...).CombinedOutput()
+	if err != nil {
+		t.Fatalf("icacls failed: %v\n%v", err, string(out))
+	}
+	return string(out)
+}
+
+func runGetACL(t *testing.T, path string) string {
+	t.Helper()
+	cmd := fmt.Sprintf(`Get-Acl "%s" | Select -expand AccessToString`, path)
+	out, err := exec.Command("powershell", "-Command", cmd).CombinedOutput()
+	if err != nil {
+		t.Fatalf("Get-Acl failed: %v\n%v", err, string(out))
+	}
+	return string(out)
+}
+
+// For issue 22343: verify that executable file created by "go build" command
+// has discretionary access control list (DACL) set as if the file
+// was created in the destination directory.
+func TestACL(t *testing.T) {
+	if isWindowsXP(t) {
+		t.Skip("Windows XP does not have powershell command")
+	}
+
+	tmpdir, err := ioutil.TempDir("", "TestACL")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(tmpdir)
+
+	newtmpdir := filepath.Join(tmpdir, "tmp")
+	err = os.Mkdir(newtmpdir, 0777)
+	if err != nil {
+		t.Fatal(err)
+	}
+
+	// When TestACL/tmp directory is created, it will have
+	// the same security attributes as TestACL.
+	// Add Guest account full access to TestACL/tmp - this
+	// will make all files created in TestACL/tmp have different
+	// security attributes to the files created in TestACL.
+	runIcacls(t, newtmpdir,
+		"/grant", "guest:(oi)(ci)f", // add Guest user to have full access
+	)
+
+	src := filepath.Join(tmpdir, "main.go")
+	err = ioutil.WriteFile(src, []byte("package main; func main() { }\n"), 0644)
+	if err != nil {
+		t.Fatal(err)
+	}
+	exe := filepath.Join(tmpdir, "main.exe")
+	cmd := exec.Command(testenv.GoToolPath(t), "build", "-o", exe, src)
+	cmd.Env = append(os.Environ(),
+		"TMP="+newtmpdir,
+		"TEMP="+newtmpdir,
+	)
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		t.Fatalf("go command failed: %v\n%v", err, string(out))
+	}
+
+	// exe file is expected to have the same security attributes as the src.
+	if got, expected := runGetACL(t, exe), runGetACL(t, src); got != expected {
+		t.Fatalf("expected Get-Acl output of \n%v\n, got \n%v\n", expected, got)
+	}
+}