More fixes for snyk reports

- Update golang to v1.25.5 to address as many CVEs as possible
- Fix more instances of path traversal vulnerabilities

Can't go beyond v1.25.5 right now because that's what OpenHPC is using to build
for openEuler.

Signed-off-by: Jonathon Anderson <janderson@ciq.com>

internal/pkg/overlay/config.go

@@ -17,7 +17,9 @@ import (
 
 var validOverlayName = regexp.MustCompile(`^[a-zA-Z0-9\-._:]+$`)
 
-func validateOverlayName(name string) error {
+// ValidateName validates that an overlay name consists only of safe characters.
+// It does not check whether the overlay actually exists.
+func ValidateName(name string) error {
 	if name == "" {
 		return fmt.Errorf("overlay name must not be empty")
 	}
@@ -29,7 +31,7 @@ func validateOverlayName(name string) error {
 
 // Get returns the filesystem path of an overlay identified by its name,
 func Get(name string) (overlay Overlay, err error) {
-	if err := validateOverlayName(name); err != nil {
+	if err := ValidateName(name); err != nil {
 		return "", err
 	}
 	overlay = getSiteOverlay(name)
@@ -47,7 +49,7 @@ func Get(name string) (overlay Overlay, err error) {
 //
 // Returns an error if the overlay already exists or if directory creation fails.
 func Create(name string) (overlay Overlay, err error) {
-	if err := validateOverlayName(name); err != nil {
+	if err := ValidateName(name); err != nil {
 		return "", err
 	}
 	overlay = getSiteOverlay(name)
@@ -104,6 +106,12 @@ func (overlay Overlay) CloneToSite() (siteOverlay Overlay, err error) {
 // If the context is empty and no overlays are specified, the empty
 // string is returned.
 func Image(nodeName string, context string, overlayNames []string) string {
+	for _, overlayName := range overlayNames {
+		if err := ValidateName(overlayName); err != nil {
+			wwlog.Warn("invalid overlay name: %s", overlayName)
+			return ""
+		}
+	}
 	var name string
 	if context != "" {
 		if len(overlayNames) > 0 {

internal/pkg/overlay/config_test.go

@@ -42,12 +42,12 @@ var validateOverlayNameTests = []struct {
 	{"foo\x00bar", true},
 }
 
-func Test_validateOverlayName(t *testing.T) {
+func Test_ValidateName(t *testing.T) {
 	for _, tt := range validateOverlayNameTests {
 		t.Run(tt.name, func(t *testing.T) {
-			err := validateOverlayName(tt.name)
+			err := ValidateName(tt.name)
 			if (err != nil) != tt.wantErr {
-				t.Errorf("validateOverlayName(%q) error = %v, wantErr %v", tt.name, err, tt.wantErr)
+				t.Errorf("ValidateName(%q) error = %v, wantErr %v", tt.name, err, tt.wantErr)
 			}
 		})
 	}

internal/pkg/warewulfd/util.go

@@ -45,6 +45,11 @@ func sendFile(
 }
 
 func getOverlayFile(n node.Node, context string, stage_overlays []string, autobuild bool) (stage_file string, err error) {
+	for _, name := range stage_overlays {
+		if err := overlay.ValidateName(name); err != nil {
+			return "", err
+		}
+	}
 	stage_file = overlay.Image(n.Id(), context, stage_overlays)
 	build := !util.IsFile(stage_file)
 	wwlog.Verbose("stage file: %s", stage_file)