providers/session: Provide option for insecure session cookie

Closes #28. Also increase security of secure session cookie.

providers/session/session.go

@@ -1,5 +1,6 @@
 package session
 
+import "log"
 import "time"
 import "net/http"
 import "html/template"
@@ -10,6 +11,7 @@ import "git.tebibyte.media/sashakoshka/go-util/container"
 import shttp "git.tebibyte.media/sashakoshka/step/http"
 
 const sessionIDCookieName = "step-session-id"
+const secureSessionIDCookieName = "__Host-step-session-id"
 const defaultLifetime = 48 * time.Hour
 
 var _ step.FuncProviderFor = new(Provider)
@@ -20,6 +22,7 @@ var _ step.Trimmer         = new(Provider)
 // Provider provides session functions.
 type Provider struct {
 	Lifetime       time.Duration
+	InsecureCookie bool
 	sessions usync.RWLocker[sessionMap]
 }
 
@@ -53,6 +56,15 @@ func (this *Provider) Configure (config step.Meta) error {
 		if err != nil { return err }
 		this.Lifetime = lifetime
 	}
+	if insecureCookieStr := config.Get("session.insecure-cookie"); insecureCookieStr != "" {
+		if insecureCookieStr != "true" && insecureCookieStr != "false" {
+			return step.ErrTypeMismatch
+		}
+		this.InsecureCookie = insecureCookieStr == "true"
+		if this.InsecureCookie {
+			log.Println("!!! session.insecure-cookie is active, this is not recommended")	
+		}
+	}
 	return nil
 }
 
@@ -61,6 +73,7 @@ func (this *Provider) FuncMapFor (document *step.Document) template.FuncMap {
 	stat := &state {
 		document: document,
 		sessions: &this.sessions,
+		insecureCookie: this.InsecureCookie,
 	}
 	return template.FuncMap {
 		"sessionHTTP":   stat.funcSessionHTTP,
@@ -72,6 +85,7 @@ type state struct {
 	document *step.Document
 	sessions *usync.RWLocker[sessionMap]
 	lifetime time.Duration
+	insecureCookie bool
 }
 
 func (this *state) funcSessionHTTP (
@@ -81,8 +95,10 @@ func (this *state) funcSessionHTTP (
 	*Session,
 	error,
 ) {
+	cookieName := sessionIDCookieName
+	if !this.insecureCookie { cookieName = secureSessionIDCookieName }
 	var id uuid.UUID
-	if cookie, err := req.Cookie(sessionIDCookieName); err == nil {
+	if cookie, err := req.Cookie(cookieName); err == nil {
 		if parsed, err := uuid.Parse(cookie.Value); err == nil {
 			id = parsed
 		}
@@ -108,14 +124,16 @@ func (this *state) funcSessionHTTP (
 		result = session
 	}
 	cookie := &http.Cookie {
-		Name:     sessionIDCookieName,
+		Name:     cookieName,
 		Value:    result.ID().String(),
 		Expires:  expiration,
-		Secure:   true,
-		HttpOnly: true,
 		SameSite: http.SameSiteStrictMode,
 		Path:     "/",
 	}
+	if !this.insecureCookie {
+		cookie.Secure = true
+		cookie.HttpOnly = true
+	}
 	underlyingRes := shttp.UnderlyingResponseWriter(res)
 	http.SetCookie(underlyingRes, cookie)
 	return result, nil