Add auth-managed proxy UI improvements

README.md

@@ -3,8 +3,9 @@
 `infinite-noodle` is a small Go service that combines:
 
 - a web UI for viewing configured TCP proxies
+- a login-protected UI with user and admin account management
 - a Bitcask-backed data store for persisted proxy definitions
-- a TCP proxy runner powered by `inet.af/tcpproxy`
+- a TCP proxy runner built with Go's standard `net` package
 
 This README is written for working in a GitHub Codespace.
 
@@ -12,27 +13,40 @@ This README is written for working in a GitHub Codespace.
 
 Each "noodle" is a TCP forwarding rule with:
 
+- a name
+- an allowed source list (`All`, one or more IPs, or CIDR ranges)
 - a listen port
 - a destination host
 - a destination port
+- an expiration duration
 - an up/down state
+- the user who created it
 
-When the app starts, it loads saved noodles from the local database and starts any active proxy routes. It also serves a basic web UI for listing and deleting them.
+When the app starts, it loads saved noodles from the local database and starts any active proxy routes. It also serves a web UI for creating, pausing, resuming, and deleting them.
 
 ## Current State
 
 The project is functional enough to:
 
 - start the web app
+- create a default admin user on a new database
+- require login before the proxy management UI is available
+- support two user levels: `regular` and `admin`
+- let any signed-in user change their own password
+- let admin users create users, change roles, change any user's password, and delete user accounts
 - load stored proxy definitions from `./infinite.db`
-- run active TCP proxies
-- delete existing noodles from the UI
+- create new noodles from the UI
+- run active TCP and UDP proxies
+- restrict a proxy to comma-separated source IPs and CIDR ranges
+- update expiration values in the database every second while a proxy is active
+- close and delete expired noodles automatically
+- pause a noodle from the UI without decrementing its expiration
+- delete existing noodles from the UI with confirmation
 
-What is not wired up yet:
+Current limitations:
 
-- the add row in the UI is present, but create/save is not implemented
-- there is no REST API for creating noodles
-- proxy routing is TCP only in the current code path
+- there is no REST API; management is currently through the server-rendered UI
+- protocols are limited to TCP and UDP
 
 ## Running In A Codespace
 
@@ -52,6 +66,14 @@ Default runtime settings:
 
 Open the app in the browser from the forwarded port for `7878`.
 
+On a brand-new database, the app creates a default UI user:
+
+- username: `admin`
+- password: `admin`
+- role: `admin`
+
+Any signed-in user can access `/users` to manage their own password. Admin users also get full user management on that page.
+
 You can also override the defaults:
 
 ```bash
@@ -65,6 +87,36 @@ Available flags:
 - `-data`: path to the Bitcask database directory
 - `-test`: seeds the database with sample noodles on startup
 
+## UI Behavior
+
+The web UI is protected by a login page. After signing in, the main table includes an add row for creating a proxy with:
+
+- `Name`
+- `Allow From`: accepts `All`, comma-separated IP addresses, or CIDR ranges such as `10.0.0.5, 192.168.1.0/24`
+- `Proto`: choose `TCP` or `UDP`
+- `Listen Port`
+- `Destination Port`
+- `Destination Host`
+- `Expiration`: parsed as a Go `time.Duration` such as `30s`, `5m`, or `1h15m`
+
+The `Status` column is a checkbox:
+
+- checked: the proxy is active and the expiration counts down
+- unchecked: the proxy is closed and the expiration is paused
+
+The table also shows:
+
+- `Created By`: the authenticated user who created the proxy
+
+Delete actions in the UI prompt for confirmation before the request is submitted.
+
+The `/users` page behavior depends on role:
+
+- `regular`: can change their own password
+- `admin`: can create users, change roles, change any password, and delete users
+
+The expiration value is shown as a live countdown in the browser. When it reaches zero, the row is removed from the UI and the noodle is deleted from the database.
+
 ## Codespaces Port Notes
 
 In Codespaces, you will usually need to forward:
@@ -85,11 +137,9 @@ Typical flow:
 
 1. Run the app with `go run ./cmd/infinite-noodle`
 2. Start the test echo server on `127.0.0.1:6666`
-3. Ensure the database contains a noodle that listens on `5555` and forwards to `127.0.0.1:6666`
+3. Add a noodle in the UI that listens on `5555` and forwards to `127.0.0.1:6666`
 4. Run the test client, which connects to `127.0.0.1:5555`
 
-Because create is not implemented in the UI yet, you currently need to seed or insert noodle records another way.
-
 ## Building Binaries
 
 The repo includes [`build.sh`](/data/project/go/src/infinite-noodle/build.sh), which builds binaries for:
@@ -108,13 +158,22 @@ sh build.sh
 
 Artifacts are written under `./target/`.
 
+To build only the Linux amd64 target:
+
+```bash
+GOOS=linux GOARCH=amd64 go build -buildvcs=false -o target/infinite-noodle.net-proxy ./cmd/infinite-noodle
+```
+
 ## Important Files
 
 - [`cmd/infinite-noodle/main.go`](/data/project/go/src/infinite-noodle/cmd/infinite-noodle/main.go): binary entrypoint and CLI flags
 - [`internal/app/app.go`](/data/project/go/src/infinite-noodle/internal/app/app.go): app startup, HTTP server, and proxy lifecycle
 - [`internal/noodle/database.go`](/data/project/go/src/infinite-noodle/internal/noodle/database.go): Bitcask storage layer
+- [`internal/web/auth.go`](/data/project/go/src/infinite-noodle/internal/web/auth.go): login, sessions, and role-based access control
 - [`internal/web/handlers.go`](/data/project/go/src/infinite-noodle/internal/web/handlers.go): HTML handlers
 - [`internal/assets/templates/index.html`](/data/project/go/src/infinite-noodle/internal/assets/templates/index.html): UI template
+- [`internal/assets/templates/login.html`](/data/project/go/src/infinite-noodle/internal/assets/templates/login.html): login page
+- [`internal/assets/templates/users.html`](/data/project/go/src/infinite-noodle/internal/assets/templates/users.html): user configuration page
 
 ## Verification Note
 

go.mod

@@ -3,14 +3,13 @@ module infinite-noodle
 go 1.19
 
 require (
+	github.com/google/uuid v1.6.0
 	go.mills.io/bitcask/v2 v2.1.3
-	inet.af/tcpproxy v0.0.0-20231102063150-2862066fc2a9
 )
 
 require (
 	github.com/abcum/lcp v0.0.0-20201209214815-7a3f3840be81 // indirect
 	github.com/gofrs/flock v0.8.1 // indirect
-	github.com/google/uuid v1.6.0 // indirect
 	github.com/hashicorp/go-immutable-radix/v2 v2.0.0 // indirect
 	github.com/hashicorp/golang-lru/v2 v2.0.7 // indirect
 	github.com/mattetti/filebuffer v1.0.1 // indirect

go.sum

@@ -1,6 +1,5 @@
 github.com/abcum/lcp v0.0.0-20201209214815-7a3f3840be81 h1:uHogIJ9bXH75ZYrXnVShHIyywFiUZ7OOabwd9Sfd8rw=
 github.com/abcum/lcp v0.0.0-20201209214815-7a3f3840be81/go.mod h1:6ZvnjTZX1LNo1oLpfaJK8h+MXqHxcBFBIwkgsv+xlv0=
-github.com/armon/go-proxyproto v0.0.0-20210323213023-7e956b284f0a/go.mod h1:QmP9hvJ91BbJmGVGSbutW19IC0Q9phDCLGaomwTJbgU=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc h1:U9qPSI2PIWSS1VwoXQT9A3Wy9MM3WgvqSxFWenqJduM=
@@ -50,5 +49,3 @@ gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
-inet.af/tcpproxy v0.0.0-20231102063150-2862066fc2a9 h1:zomTWJvjwLbKRgGameQtpK6DNFUbZ2oNJuWhgUkGp3M=
-inet.af/tcpproxy v0.0.0-20231102063150-2862066fc2a9/go.mod h1:Tojt5kmHpDIR2jMojxzZK2w2ZR7OILODmUo2gaSwjrk=

internal/app/app.go

@@ -2,14 +2,16 @@ package app
 
 import (
 	"fmt"
+	"io"
 	"log"
+	"net"
 	"net/http"
+	"strings"
+	"sync"
 	"time"
 
 	"infinite-noodle/internal/noodle"
 	"infinite-noodle/internal/web"
-
-	"inet.af/tcpproxy"
 )
 
 type Config struct {
@@ -26,16 +28,34 @@ func Run(cfg Config) error {
 	db := noodle.NewDatabase(cfg.DataPath)
 	defer db.Close()
 
+	auth, err := web.NewAuth(db)
+	if err != nil {
+		return err
+	}
+	if err := auth.EnsureDefaultUser(); err != nil {
+		return err
+	}
+
 	if cfg.RunTest {
 		runTestSequence(db)
 	}
 
 	go systemCheck(db, noodleChannel)
-	go tcpProxify(noodleChannel)
+	go expirationCheck(db, noodleChannel)
+	go proxify(db, noodleChannel)
 
 	http.Handle("/static/", http.StripPrefix("/static/", http.FileServer(http.FS(web.StaticFiles()))))
-	http.HandleFunc("/", web.HandleMain(db, &noodleChannel))
-	http.HandleFunc("/delete", web.HandleDelete(db, &noodleChannel))
+	http.HandleFunc("/login", auth.HandleLogin())
+	http.HandleFunc("/logout", auth.HandleLogout())
+	http.HandleFunc("/", auth.RequireAuth(web.HandleMain(db, &noodleChannel, auth)))
+	http.HandleFunc("/users", auth.RequireAuth(web.HandleUsers(auth, db)))
+	http.HandleFunc("/users/add", auth.RequireAdmin(web.HandleAddUser(auth, db)))
+	http.HandleFunc("/users/role", auth.RequireAdmin(web.HandleSetUserRole(auth, db)))
+	http.HandleFunc("/users/password", auth.RequireAuth(web.HandleChangePassword(auth, db)))
+	http.HandleFunc("/users/delete", auth.RequireAuth(web.HandleDeleteUser(auth, db)))
+	http.HandleFunc("/add", auth.RequireAuth(web.HandleAdd(db, &noodleChannel, auth)))
+	http.HandleFunc("/toggle", auth.RequireAuth(web.HandleToggle(db, &noodleChannel)))
+	http.HandleFunc("/delete", auth.RequireAuth(web.HandleDelete(db, &noodleChannel)))
 
 	log.Printf("Server starting on %s", listenAddr)
 	return http.ListenAndServe(listenAddr, nil)
@@ -51,23 +71,22 @@ func systemCheck(db *noodle.Database, noodleChannel chan noodle.Noodle) {
 	}
 }
 
-func startProxy(proxy *tcpproxy.Proxy) {
-	log.Print(proxy.Run())
-}
-
-func tcpProxify(noodleChannel chan noodle.Noodle) {
-	noodleMap := make(map[string]*tcpproxy.Proxy)
+func proxify(db *noodle.Database, noodleChannel chan noodle.Noodle) {
+	noodleMap := make(map[string]managedProxy)
 	for {
 		item := <-noodleChannel
 		_, running := noodleMap[item.Id]
 		if item.IsUp && !running {
-			var proxy tcpproxy.Proxy
-			src := fmt.Sprintf("0.0.0.0:%d", item.ListenPort)
-			dst := fmt.Sprintf("%s:%d", item.DestHost, item.DestPort)
-			log.Printf("Starting a noodle from %s to %s", src, dst)
-			proxy.AddRoute(src, tcpproxy.To(dst))
-			noodleMap[item.Id] = &proxy
-			go startProxy(&proxy)
+			proxy, err := newProxy(item)
+			if err != nil {
+				log.Print(err)
+				if _, updateErr := db.SetIsUp(item.Id, false); updateErr != nil {
+					log.Print(updateErr)
+				}
+				continue
+			}
+			noodleMap[item.Id] = proxy
+			go proxy.Run()
 			continue
 		}
 
@@ -76,6 +95,430 @@ func tcpProxify(noodleChannel chan noodle.Noodle) {
 			if err := noodleMap[item.Id].Close(); err != nil {
 				log.Print(err)
 			}
+			delete(noodleMap, item.Id)
+		}
+	}
+}
+
+type managedProxy interface {
+	Run()
+	Close() error
+}
+
+func newProxy(item noodle.Noodle) (managedProxy, error) {
+	listenAddr := fmt.Sprintf("0.0.0.0:%d", item.ListenPort)
+	targetAddr := fmt.Sprintf("%s:%d", item.DestHost, item.DestPort)
+	proto := normalizeProto(item.Proto)
+	log.Printf("Starting a %s noodle from %s to %s with source=%s", proto, listenAddr, targetAddr, item.Src)
+
+	switch proto {
+	case "UDP":
+		return newUDPNoodleProxy(listenAddr, targetAddr, item.Src)
+	default:
+		return newTCPNoodleProxy(listenAddr, targetAddr, item.Src)
+	}
+}
+
+func normalizeProto(proto string) string {
+	switch strings.ToUpper(strings.TrimSpace(proto)) {
+	case "UDP":
+		return "UDP"
+	default:
+		return "TCP"
+	}
+}
+
+type tcpNoodleProxy struct {
+	listenAddr string
+	targetAddr string
+	allowedIP  string
+	listener   net.Listener
+	mu         sync.Mutex
+	conns      map[net.Conn]struct{}
+}
+
+func newTCPNoodleProxy(listenAddr, targetAddr, allowedIP string) (*tcpNoodleProxy, error) {
+	ln, err := net.Listen("tcp", listenAddr)
+	if err != nil {
+		return nil, err
+	}
+	return &tcpNoodleProxy{
+		listenAddr: listenAddr,
+		targetAddr: targetAddr,
+		allowedIP:  allowedIP,
+		listener:   ln,
+		conns:      make(map[net.Conn]struct{}),
+	}, nil
+}
+
+func (p *tcpNoodleProxy) Run() {
+	for {
+		conn, err := p.listener.Accept()
+		if err != nil {
+			if isClosedNetworkError(err) {
+				return
+			}
+			log.Printf("Accept failed for %s: %v", p.listenAddr, err)
+			return
+		}
+		go p.handleConn(conn)
+	}
+}
+
+func (p *tcpNoodleProxy) handleConn(src net.Conn) {
+	if !allowSource(p.allowedIP, src.RemoteAddr()) {
+		log.Printf("Rejected noodle connection from %s; allowed source is %s", src.RemoteAddr().String(), p.allowedIP)
+		src.Close()
+		return
+	}
+
+	dst, err := net.Dial("tcp", p.targetAddr)
+	if err != nil {
+		log.Printf("Dial failed from %s to %s: %v", p.listenAddr, p.targetAddr, err)
+		src.Close()
+		return
+	}
+
+	p.trackConn(src)
+	p.trackConn(dst)
+	defer p.untrackAndClose(src)
+	defer p.untrackAndClose(dst)
+
+	var wg sync.WaitGroup
+	wg.Add(2)
+
+	go func() {
+		defer wg.Done()
+		if _, err := io.Copy(dst, src); err != nil && !isClosedNetworkError(err) {
+			log.Printf("Proxy copy src->dst failed for %s to %s: %v", p.listenAddr, p.targetAddr, err)
+		}
+		closeWrite(dst)
+	}()
+
+	go func() {
+		defer wg.Done()
+		if _, err := io.Copy(src, dst); err != nil && !isClosedNetworkError(err) {
+			log.Printf("Proxy copy dst->src failed for %s to %s: %v", p.targetAddr, p.listenAddr, err)
+		}
+		closeWrite(src)
+	}()
+
+	wg.Wait()
+}
+
+func (p *tcpNoodleProxy) Close() error {
+	err := p.listener.Close()
+	p.mu.Lock()
+	defer p.mu.Unlock()
+	for conn := range p.conns {
+		_ = conn.Close()
+	}
+	return err
+}
+
+func (p *tcpNoodleProxy) trackConn(conn net.Conn) {
+	p.mu.Lock()
+	defer p.mu.Unlock()
+	p.conns[conn] = struct{}{}
+}
+
+func (p *tcpNoodleProxy) untrackAndClose(conn net.Conn) {
+	p.mu.Lock()
+	delete(p.conns, conn)
+	p.mu.Unlock()
+	_ = conn.Close()
+}
+
+type udpNoodleProxy struct {
+	listenAddr string
+	targetAddr string
+	allowedIP  string
+	conn       *net.UDPConn
+	mu         sync.Mutex
+	sessions   map[string]*udpSession
+	closed     bool
+}
+
+type udpSession struct {
+	clientAddr *net.UDPAddr
+	backend    *net.UDPConn
+	lastSeen   time.Time
+}
+
+const udpSessionIdleTimeout = 2 * time.Minute
+
+func newUDPNoodleProxy(listenAddr, targetAddr, allowedIP string) (*udpNoodleProxy, error) {
+	addr, err := net.ResolveUDPAddr("udp", listenAddr)
+	if err != nil {
+		return nil, err
+	}
+	conn, err := net.ListenUDP("udp", addr)
+	if err != nil {
+		return nil, err
+	}
+	return &udpNoodleProxy{
+		listenAddr: listenAddr,
+		targetAddr: targetAddr,
+		allowedIP:  allowedIP,
+		conn:       conn,
+		sessions:   make(map[string]*udpSession),
+	}, nil
+}
+
+func (p *udpNoodleProxy) Run() {
+	go p.cleanupIdleSessions()
+
+	buf := make([]byte, 65535)
+	for {
+		n, clientAddr, err := p.conn.ReadFromUDP(buf)
+		if err != nil {
+			if isClosedNetworkError(err) {
+				return
+			}
+			log.Printf("UDP read failed for %s: %v", p.listenAddr, err)
+			return
+		}
+		if !allowSource(p.allowedIP, clientAddr) {
+			log.Printf("Rejected noodle datagram from %s; allowed source is %s", clientAddr.String(), p.allowedIP)
+			continue
+		}
+
+		session, err := p.sessionFor(clientAddr)
+		if err != nil {
+			log.Printf("UDP session setup failed for %s to %s: %v", clientAddr.String(), p.targetAddr, err)
+			continue
+		}
+		payload := append([]byte(nil), buf[:n]...)
+		if _, err := session.backend.Write(payload); err != nil && !isClosedNetworkError(err) {
+			log.Printf("UDP write failed from %s to %s: %v", clientAddr.String(), p.targetAddr, err)
+			p.removeSession(clientAddr.String(), true)
+		}
+	}
+}
+
+func (p *udpNoodleProxy) sessionFor(clientAddr *net.UDPAddr) (*udpSession, error) {
+	key := clientAddr.String()
+
+	p.mu.Lock()
+	if session, ok := p.sessions[key]; ok {
+		session.lastSeen = time.Now()
+		p.mu.Unlock()
+		return session, nil
+	}
+	p.mu.Unlock()
+
+	targetAddr, err := net.ResolveUDPAddr("udp", p.targetAddr)
+	if err != nil {
+		return nil, err
+	}
+	backend, err := net.DialUDP("udp", nil, targetAddr)
+	if err != nil {
+		return nil, err
+	}
+
+	session := &udpSession{
+		clientAddr: clientAddr,
+		backend:    backend,
+		lastSeen:   time.Now(),
+	}
+
+	p.mu.Lock()
+	if existing, ok := p.sessions[key]; ok {
+		p.mu.Unlock()
+		_ = backend.Close()
+		return existing, nil
+	}
+	p.sessions[key] = session
+	p.mu.Unlock()
+
+	go p.relayBackend(session)
+	return session, nil
+}
+
+func (p *udpNoodleProxy) relayBackend(session *udpSession) {
+	buf := make([]byte, 65535)
+	for {
+		n, err := session.backend.Read(buf)
+		if err != nil {
+			if !isClosedNetworkError(err) {
+				log.Printf("UDP backend read failed for %s: %v", p.targetAddr, err)
+			}
+			p.removeSession(session.clientAddr.String(), false)
+			return
+		}
+		if _, err := p.conn.WriteToUDP(buf[:n], session.clientAddr); err != nil {
+			if !isClosedNetworkError(err) {
+				log.Printf("UDP client write failed for %s: %v", session.clientAddr.String(), err)
+			}
+			p.removeSession(session.clientAddr.String(), true)
+			return
+		}
+
+		p.mu.Lock()
+		if current, ok := p.sessions[session.clientAddr.String()]; ok {
+			current.lastSeen = time.Now()
+		}
+		p.mu.Unlock()
+	}
+}
+
+func (p *udpNoodleProxy) cleanupIdleSessions() {
+	ticker := time.NewTicker(30 * time.Second)
+	defer ticker.Stop()
+
+	for range ticker.C {
+		if p.isClosed() {
+			return
+		}
+		cutoff := time.Now().Add(-udpSessionIdleTimeout)
+		var expired []string
+
+		p.mu.Lock()
+		for key, session := range p.sessions {
+			if session.lastSeen.Before(cutoff) {
+				expired = append(expired, key)
+			}
+		}
+		p.mu.Unlock()
+
+		for _, key := range expired {
+			p.removeSession(key, true)
+		}
+	}
+}
+
+func (p *udpNoodleProxy) removeSession(key string, closeBackend bool) {
+	p.mu.Lock()
+	session, ok := p.sessions[key]
+	if ok {
+		delete(p.sessions, key)
+	}
+	p.mu.Unlock()
+	if ok && closeBackend {
+		_ = session.backend.Close()
+	}
+}
+
+func (p *udpNoodleProxy) isClosed() bool {
+	p.mu.Lock()
+	defer p.mu.Unlock()
+	return p.closed
+}
+
+func (p *udpNoodleProxy) Close() error {
+	p.mu.Lock()
+	if p.closed {
+		p.mu.Unlock()
+		return nil
+	}
+	p.closed = true
+	sessions := p.sessions
+	p.sessions = make(map[string]*udpSession)
+	conn := p.conn
+	p.mu.Unlock()
+
+	for _, session := range sessions {
+		_ = session.backend.Close()
+	}
+	if conn == nil {
+		return nil
+	}
+	return conn.Close()
+}
+
+func allowSource(allowedIPs string, addr net.Addr) bool {
+	if allowedIPs == "" || strings.EqualFold(strings.TrimSpace(allowedIPs), "All") {
+		return true
+	}
+	host, _, err := net.SplitHostPort(addr.String())
+	if err != nil {
+		return false
+	}
+	hostIP := normalizeIP(net.ParseIP(host))
+	if hostIP == nil {
+		return false
+	}
+	for _, item := range strings.Split(allowedIPs, ",") {
+		entry := strings.TrimSpace(item)
+		if strings.Contains(entry, "/") {
+			_, network, err := net.ParseCIDR(entry)
+			if err == nil && networkContainsIP(network, hostIP) {
+				return true
+			}
+			continue
+		}
+
+		entryIP := normalizeIP(net.ParseIP(entry))
+		if entryIP != nil && entryIP.Equal(hostIP) {
+			return true
+		}
+	}
+	return false
+}
+
+func normalizeIP(ip net.IP) net.IP {
+	if ip == nil {
+		return nil
+	}
+	if v4 := ip.To4(); v4 != nil {
+		return v4
+	}
+	return ip
+}
+
+func networkContainsIP(network *net.IPNet, ip net.IP) bool {
+	if network == nil || ip == nil {
+		return false
+	}
+	if network.Contains(ip) {
+		return true
+	}
+
+	networkIP := normalizeIP(network.IP)
+	normalizedIP := normalizeIP(ip)
+	if networkIP == nil || normalizedIP == nil {
+		return false
+	}
+	if len(networkIP) != len(normalizedIP) {
+		return false
+	}
+
+	mask := network.Mask
+	if len(mask) != len(normalizedIP) {
+		return false
+	}
+	for i := range normalizedIP {
+		if normalizedIP[i]&mask[i] != networkIP[i]&mask[i] {
+			return false
+		}
+	}
+	return true
+}
+
+func closeWrite(conn net.Conn) {
+	if tcpConn, ok := conn.(*net.TCPConn); ok {
+		_ = tcpConn.CloseWrite()
+	}
+}
+
+func isClosedNetworkError(err error) bool {
+	if err == nil {
+		return false
+	}
+	if net.ErrClosed != nil && err == net.ErrClosed {
+		return true
+	}
+	return strings.Contains(err.Error(), "use of closed network connection")
+}
+
+func expirationCheck(db *noodle.Database, noodleChannel chan noodle.Noodle) {
+	ticker := time.NewTicker(1 * time.Second)
+	defer ticker.Stop()
+
+	for range ticker.C {
+		stopped := db.TickExpirations()
+		for _, item := range stopped {
+			noodleChannel <- item
 		}
 	}
 }
@@ -85,11 +528,12 @@ func runTestSequence(db *noodle.Database) {
 		item := noodle.Noodle{
 			Id:         db.MakeID(),
 			Name:       "Name_Test",
-			Proto:      "Proto_Test",
+			Proto:      "TCP",
+			Src:        "All",
 			ListenPort: 1080 + i,
 			DestPort:   22,
 			DestHost:   "localhost",
-			Expiration: time.Now().Second(),
+			Expiration: time.Duration(time.Now().Second()) * time.Second,
 			IsUp:       true,
 		}
 		log.Printf("Test noodle=%v", item)

internal/assets/templates/index.html

@@ -11,8 +11,11 @@
             background-image: url("/static/pub/long-banner.jpg");
             background-repeat: no-repeat;
             background-size: cover;
+            background-position: center;
             position: relative;
-            width: 100%; 
+            flex: 1 1 auto;
+            width: 100%;
+            min-height: 50px;
         }
         img.banner {
             height: 50px;
@@ -24,6 +27,15 @@
         table {
             width: 100%;
         }
+        .allow-from-options {
+            display: flex;
+            gap: 0.35rem;
+            flex-wrap: wrap;
+            margin-top: 0.35rem;
+        }
+        .allow-from-options .button {
+            height: 1.8rem;
+        }
     </style> 
 </head>
 
@@ -34,6 +46,15 @@
         </div>
         <div class="banner-container">
             <!-- <img class="banner-long" src="/static/pub/long-banner.jpg"/> -->
+        <div class="navbar-end pr-4">
+            <div class="navbar-item">
+                <span class="has-text-white mr-3">Signed in as {{.Username}}</span>
+                <a class="button is-small is-warning mr-2" href="/users">{{if eq .Role "admin"}}Users{{else}}Account{{end}}</a>
+                <form method="post" action="/logout" autocomplete="off">
+                    <button class="button is-small is-light" type="submit">Logout</button>
+                </form>
+            </div>
+        </div>
         </div>
     </nav>
     
@@ -43,49 +64,79 @@
                 <tr>
                     <th>Name</th>
                     <th>Proto</th>
+                    <th>Allow From</th>
                     <th>Listening Port</th>
                     <th>Dest Port</th>
                     <th>Dest Host/IP</th>
                     <th>Expiration</th>
                     <th>Status</th>
+                    <th>Created By</th>
                     <th></th>
                 </tr>
             </thead>
             <tbody>
                 <tr>
-                    <td><input class="input is-link is-small" type="text" placeholder="Name"/></td>
-                    <td>TCP</td>
-                    <td><input class="input is-link is-small" type="text" placeholder="Listen Port"/></td>
-                    <td><input class="input is-link is-small" type="text" placeholder="Destination Port"/></td>
-                    <td><input class="input is-link is-small" type="text" placeholder="Destination Host"/></td>
-                    <td>Expiration</td>
+                    <td><input class="input is-link is-small" type="text" form="add-noodle" name="name" placeholder="Name" autocomplete="off" required/></td>
+                    <td>
+                        <div class="select is-small is-link">
+                            <select form="add-noodle" name="proto" autocomplete="off" required>
+                                <option value="TCP">TCP</option>
+                                <option value="UDP">UDP</option>
+                            </select>
+                        </div>
+                    </td>
+                    <td>
+                        <input class="input is-link is-small" type="text" form="add-noodle" name="src" list="allow-from-options" placeholder="All, comma-separated IPs, or CIDRs" value="All" autocomplete="off" required/>
+                        <datalist id="allow-from-options">
+                            <option value="All"></option>
+                            <option value="{{.ClientIP}}"></option>
+                        </datalist>
+                        <div class="allow-from-options">
+                            <button class="button is-small is-white" type="button" onclick="setAllowFromValue('All')">All</button>
+                            <button class="button is-small is-white" type="button" onclick="setAllowFromValue('{{.ClientIP}}')">{{.ClientIP}}</button>
+                        </div>
+                    </td>
+                    <td><input class="input is-link is-small" type="text" form="add-noodle" name="listen_port" placeholder="Listen Port" autocomplete="off" required/></td>
+                    <td><input class="input is-link is-small" type="text" form="add-noodle" name="dest_port" placeholder="Destination Port" autocomplete="off" required/></td>
+                    <td><input class="input is-link is-small" type="text" form="add-noodle" name="dest_host" placeholder="Destination Host" autocomplete="off" required/></td>
+                    <td><input class="input is-link is-small" type="text" form="add-noodle" name="expiration" placeholder="30m, 1h15m" autocomplete="off" required/></td>
                     <td>
                     </td>
                     <td>
-                        <button class="button">
-                            <span class="icon has-text-success"><i class="fas fa-plus"></i></span>
-                        </button>
+                    </td>
+                    <td>
+                        <form id="add-noodle" method="post" action="/add" autocomplete="off">
+                            <button class="button" type="submit">
+                                <span class="icon has-text-success"><i class="fas fa-plus"></i></span>
+                            </button>
+                        </form>
                     </td>
                 </tr>
-                {{range .}}
+                {{range .Noodles}}
                 <tr>
                     <td>{{.Name}}</td>
                     <td>{{.Proto}}</td>
+                    <td>{{.Src}}</td>
                     <td>{{.ListenPort}}</td>
                     <td>{{.DestPort}}</td>
                     <td>{{.DestHost}}</td>
-                    <td>{{.Expiration}}</td>
+                    <td data-expiration-ms="{{.Expiration.Milliseconds}}" data-is-up="{{.IsUp}}">{{.Expiration}}</td>
                     <td>
-                        {{if .IsUp}}
-                        <span class="icon has-text-success"><i class="fas fa-check-square"></i></span>
-                        {{ else }}
-                        <span class="icon has-text-danger"><i class="fas fa-ban"></i></span>
-                        {{ end }}
+                        <form method="post" action="/toggle" autocomplete="off">
+                            <input type="hidden" name="id" value="{{.Id}}"/>
+                            <label>
+                                <input type="checkbox" name="is_up" onchange="this.form.submit()" {{if .IsUp}}checked{{end}}/>
+                            </label>
+                        </form>
                     </td>
+                    <td>{{.CreatedBy}}</td>
                     <td>
-                        <a href="/delete?id={{.Id}}">
-                            <span class="icon has-text-danger"><i class="fas fa-minus"></i></span>
-                        </a>
+                        <form method="post" action="/delete" autocomplete="off" onsubmit="return confirm('Delete this proxy?');">
+                            <input type="hidden" name="id" value="{{.Id}}"/>
+                            <button class="button is-white" type="submit" aria-label="Delete noodle">
+                                <span class="icon has-text-danger"><i class="fas fa-minus"></i></span>
+                            </button>
+                        </form>
                     </td>
                 </tr>
                 {{end}}
@@ -95,10 +146,72 @@
     <footer class="footer">
         <div class="content has-text-centered">
           <p>
-            <strong>Infinite-Noodles Network Proxy</strong> - &copy; 2025 Jimmy Allen
+            <strong>Infinite-Noodles Network Proxy</strong>
           </p>
         </div>
       </footer>
+    <script>
+        function setAllowFromValue(value) {
+            const input = document.querySelector('input[name="src"]');
+            if (!input) {
+                return;
+            }
+            input.value = value;
+            input.focus();
+        }
+
+        function formatDuration(ms) {
+            if (ms <= 0) {
+                return "0s";
+            }
+
+            let totalSeconds = Math.floor(ms / 1000);
+            const hours = Math.floor(totalSeconds / 3600);
+            totalSeconds -= hours * 3600;
+            const minutes = Math.floor(totalSeconds / 60);
+            const seconds = totalSeconds % 60;
+            const parts = [];
+
+            if (hours > 0) {
+                parts.push(hours + "h");
+            }
+            if (minutes > 0 || hours > 0) {
+                parts.push(minutes + "m");
+            }
+            parts.push(seconds + "s");
+
+            return parts.join("");
+        }
+
+        function updateExpirationCountdowns() {
+            const expirationCells = document.querySelectorAll("[data-expiration-ms]");
+            expirationCells.forEach((cell) => {
+                if (cell.dataset.isUp !== "true") {
+                    return;
+                }
+                const nextValue = Number(cell.dataset.expirationMs) - 1000;
+                const clampedValue = Math.max(nextValue, 0);
+                cell.dataset.expirationMs = String(clampedValue);
+                if (clampedValue === 0) {
+                    const row = cell.closest("tr");
+                    if (row) {
+                        row.remove();
+                    }
+                    return;
+                }
+                cell.textContent = formatDuration(clampedValue);
+            });
+        }
+
+        document.addEventListener("DOMContentLoaded", () => {
+            const expirationCells = document.querySelectorAll("[data-expiration-ms]");
+            expirationCells.forEach((cell) => {
+                cell.textContent = formatDuration(Number(cell.dataset.expirationMs));
+            });
+
+            window.setInterval(updateExpirationCountdowns, 1000);
+        });
+    </script>
 </body>
 
-</html>
+</html>

internal/assets/templates/login.html

@@ -0,0 +1,101 @@
+<!DOCTYPE html>
+<html data-theme="dark">
+<head>
+    <title>Infinite-Noodles Login</title>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <link rel="stylesheet" href="/static/pub/bulma.min.css">
+    <link rel="stylesheet" href="/static/pub/all.min.css">
+    <style>
+        body {
+            min-height: 100vh;
+            background-color: #000;
+            color: #f5f5f5;
+        }
+        .banner-container {
+            background-image: url("/static/pub/long-banner.jpg");
+            background-repeat: no-repeat;
+            background-size: cover;
+            background-position: center;
+            position: relative;
+            flex: 1 1 auto;
+            width: 100%;
+            min-height: 50px;
+        }
+        img.banner {
+            height: 50px;
+        }
+        .login-shell {
+            min-height: calc(100vh - 52px);
+            display: flex;
+            align-items: center;
+            justify-content: center;
+            padding: 1.5rem;
+        }
+        .login-card {
+            width: 100%;
+            max-width: 440px;
+            background: #111;
+            border-radius: 18px;
+            border: 1px solid #2f2f2f;
+            box-shadow: 0 24px 60px rgba(0, 0, 0, 0.45);
+            overflow: hidden;
+        }
+        .login-body {
+            padding: 2rem;
+        }
+        .login-body .label,
+        .login-body .help,
+        .login-body p,
+        .login-body strong {
+            color: #f5f5f5;
+        }
+        .login-body .input {
+            background: #1b1b1b;
+            border-color: #3d3d3d;
+            color: #f5f5f5;
+        }
+        .login-body .input::placeholder {
+            color: #9a9a9a;
+        }
+    </style>
+</head>
+<body>
+    <nav class="navbar is-fixed-top" role="navigation" aria-label="main navigation">
+        <div class="navbar-brand">
+            <img class="banner" src="/static/pub/logo.jpg"/>
+        </div>
+        <div class="banner-container"></div>
+    </nav>
+    <main class="login-shell">
+        <section class="login-card">
+            <div class="login-body">
+                {{if .Error}}
+                <article class="message is-danger">
+                    <div class="message-body">{{.Error}}</div>
+                </article>
+                {{end}}
+                <form method="post" action="/login" autocomplete="off">
+                    <div class="field">
+                        <label class="label">Username</label>
+                        <div class="control has-icons-left">
+                            <input class="input" type="text" name="username" required autofocus>
+                            <span class="icon is-small is-left"><i class="fas fa-user"></i></span>
+                        </div>
+                    </div>
+                    <div class="field">
+                        <label class="label">Password</label>
+                        <div class="control has-icons-left">
+                            <input class="input" type="password" name="password" required>
+                            <span class="icon is-small is-left"><i class="fas fa-lock"></i></span>
+                        </div>
+                    </div>
+                    <div class="field">
+                        <button class="button is-link is-fullwidth" type="submit">Login</button>
+                    </div>
+                </form>
+            </div>
+        </section>
+    </main>
+</body>
+</html>

internal/assets/templates/users.html

@@ -0,0 +1,234 @@
+<!DOCTYPE html>
+<html data-theme="dark">
+<head>
+    <title>User Configuration</title>
+    <meta charset="utf-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1">
+    <link rel="stylesheet" href="/static/pub/bulma.min.css">
+    <link rel="stylesheet" href="/static/pub/all.min.css">
+    <style>
+        body {
+            min-height: 100vh;
+            background-color: #000;
+            color: #f5f5f5;
+        }
+        .banner-container {
+            background-image: url("/static/pub/long-banner.jpg");
+            background-repeat: no-repeat;
+            background-size: cover;
+            background-position: center;
+            position: relative;
+            flex: 1 1 auto;
+            width: 100%;
+            min-height: 50px;
+        }
+        img.banner {
+            height: 50px;
+        }
+        .page-shell {
+            padding: 5rem 1.25rem 3rem;
+        }
+        .page-card {
+            background: #111;
+            border-radius: 18px;
+            border: 1px solid #2f2f2f;
+            box-shadow: 0 20px 50px rgba(0, 0, 0, 0.45);
+        }
+        .title,
+        .subtitle,
+        .label,
+        .table,
+        .table th,
+        .table td,
+        strong,
+        p {
+            color: #f5f5f5;
+        }
+        .table {
+            background: transparent;
+            font-size: 0.9rem;
+        }
+        .table th,
+        .table td {
+            border-color: #2f2f2f;
+            vertical-align: top;
+            padding: 0.5rem 0.6rem;
+        }
+        .input,
+        .select select {
+            background: #1b1b1b;
+            border-color: #3d3d3d;
+            color: #f5f5f5;
+        }
+        .input::placeholder {
+            color: #9a9a9a;
+        }
+        .user-actions .button,
+        .user-actions .input,
+        .user-actions .select select {
+            font-size: 0.8rem;
+            height: 2rem;
+        }
+        .user-actions .field:not(:last-child) {
+            margin-bottom: 0.4rem;
+        }
+    </style>
+</head>
+<body>
+    <nav class="navbar is-fixed-top" role="navigation" aria-label="main navigation">
+        <div class="navbar-brand">
+            <img class="banner" src="/static/pub/logo.jpg"/>
+        </div>
+        <div class="banner-container"></div>
+    </nav>
+    <section class="page-shell">
+        <div class="container is-max-desktop">
+            <div class="level mb-5">
+                <div class="level-left">
+                    <div>
+                        <h1 class="title is-3">User Configuration</h1>
+                        <p class="subtitle is-6">Signed in as {{.Username}} ({{.Role}})</p>
+                    </div>
+                </div>
+                <div class="level-right">
+                    <div class="buttons">
+                        <a class="button is-light" href="/">Back to Proxies</a>
+                        <form method="post" action="/logout" autocomplete="off">
+                            <button class="button is-dark" type="submit">Logout</button>
+                        </form>
+                    </div>
+                </div>
+            </div>
+
+            {{if .Error}}
+            <article class="message is-danger">
+                <div class="message-body">{{.Error}}</div>
+            </article>
+            {{end}}
+
+            <div class="columns is-variable is-5">
+                <div class="column is-5">
+                    {{if ne .Role "admin"}}
+                    <div class="box page-card">
+                        <h2 class="title is-5">Change Your Password</h2>
+                        <form method="post" action="/users/password" autocomplete="off">
+                            <input type="hidden" name="username" value="{{.Username}}">
+                            <div class="field">
+                                <label class="label">New Password</label>
+                                <div class="control">
+                                    <input class="input" type="password" name="password" required>
+                                </div>
+                            </div>
+                            <div class="field">
+                                <label class="label">Confirm Password</label>
+                                <div class="control">
+                                    <input class="input" type="password" name="confirm_password" required>
+                                </div>
+                            </div>
+                            <button class="button is-link is-fullwidth" type="submit">Update Password</button>
+                        </form>
+                    </div>
+                    {{end}}
+
+                    {{if eq .Role "admin"}}
+                    <div class="box page-card">
+                        <h2 class="title is-5">Add User</h2>
+                        <form method="post" action="/users/add" autocomplete="off">
+                            <div class="field">
+                                <label class="label">Username</label>
+                                <div class="control">
+                                    <input class="input" type="text" name="username" required>
+                                </div>
+                            </div>
+                            <div class="field">
+                                <label class="label">Password</label>
+                                <div class="control">
+                                    <input class="input" type="password" name="password" required>
+                                </div>
+                            </div>
+                            <div class="field">
+                                <label class="label">Role</label>
+                                <div class="control">
+                                    <div class="select is-fullwidth">
+                                        <select name="role">
+                                            <option value="regular">regular</option>
+                                            <option value="admin">admin</option>
+                                        </select>
+                                    </div>
+                                </div>
+                            </div>
+                            <button class="button is-link is-fullwidth" type="submit">Create User</button>
+                        </form>
+                    </div>
+                    {{end}}
+                </div>
+                <div class="column">
+                    {{if eq .Role "admin"}}
+                    <div class="box page-card">
+                        <h2 class="title is-5">Existing Users</h2>
+                        <table class="table is-fullwidth is-striped is-hoverable is-narrow">
+                            <thead>
+                                <tr>
+                                    <th>Username</th>
+                                    <th>Role</th>
+                                    <th>Created</th>
+                                    <th></th>
+                                </tr>
+                            </thead>
+                            <tbody>
+                                {{range .Users}}
+                                <tr>
+                                    <td>{{.Username}}</td>
+                                    <td>{{.Role}}</td>
+                                    <td>{{.CreatedAt.Format "2006-01-02 15:04:05 UTC"}}</td>
+                                    <td class="user-actions">
+                                        <form method="post" action="/users/role" autocomplete="off" class="mb-2">
+                                            <input type="hidden" name="username" value="{{.Username}}">
+                                            <div class="field has-addons">
+                                                <div class="control is-expanded">
+                                                    <div class="select is-small is-fullwidth">
+                                                        <select name="role">
+                                                            <option value="regular" {{if eq .Role "regular"}}selected{{end}}>regular</option>
+                                                            <option value="admin" {{if eq .Role "admin"}}selected{{end}}>admin</option>
+                                                        </select>
+                                                    </div>
+                                                </div>
+                                                <div class="control">
+                                                    <button class="button is-small is-info" type="submit">Update</button>
+                                                </div>
+                                            </div>
+                                        </form>
+                                        <form method="post" action="/users/password" autocomplete="off" class="mb-2">
+                                            <input type="hidden" name="username" value="{{.Username}}">
+                                            <div class="field has-addons">
+                                                <div class="control is-expanded">
+                                                    <input class="input is-small" type="password" name="password" placeholder="New password" required>
+                                                </div>
+                                                <div class="control">
+                                                    <button class="button is-small is-warning" type="submit">Set Password</button>
+                                                </div>
+                                            </div>
+                                        </form>
+                                        <form method="post" action="/users/delete" autocomplete="off" onsubmit="return confirm('Delete user {{.Username}}?');">
+                                            <input type="hidden" name="username" value="{{.Username}}">
+                                            <button class="button is-small is-danger is-light" type="submit">Delete User</button>
+                                        </form>
+                                    </td>
+                                </tr>
+                                {{end}}
+                            </tbody>
+                        </table>
+                    </div>
+                    {{else}}
+                    <div class="box page-card">
+                        <h2 class="title is-5">Account</h2>
+                        <p class="mb-2"><strong>Username:</strong> {{.Username}}</p>
+                        <p><strong>Role:</strong> {{.Role}}</p>
+                    </div>
+                    {{end}}
+                </div>
+            </div>
+        </div>
+    </section>
+</body>
+</html>

internal/noodle/database.go

@@ -1,15 +1,24 @@
 package noodle
 
 import (
+	"errors"
+	"fmt"
 	"log"
+	"sync"
+	"time"
 
 	"github.com/google/uuid"
 	"go.mills.io/bitcask/v2"
 )
 
+var ErrUserNotFound = errors.New("user not found")
+var ErrLastAdminRemoval = errors.New("cannot remove the last admin")
+
 type Database struct {
 	connection *bitcask.Bitcask
 	Handle     *bitcask.Collection
+	Users      *bitcask.Collection
+	mu         sync.Mutex
 }
 
 func NewDatabase(path string) *Database {
@@ -20,6 +29,7 @@ func NewDatabase(path string) *Database {
 	return &Database{
 		connection: db,
 		Handle:     db.Collection("noodles"),
+		Users:      db.Collection("users"),
 	}
 }
 
@@ -33,6 +43,9 @@ func (db *Database) MakeID() string {
 }
 
 func (db *Database) GetAll() []Noodle {
+	db.mu.Lock()
+	defer db.mu.Unlock()
+
 	var data []Noodle
 	if err := db.Handle.List(&data); err != nil {
 		log.Print(err)
@@ -42,6 +55,9 @@ func (db *Database) GetAll() []Noodle {
 }
 
 func (db *Database) GetAllGeneric() []interface{} {
+	db.mu.Lock()
+	defer db.mu.Unlock()
+
 	var data []interface{}
 	if err := db.Handle.List(&data); err != nil {
 		log.Print(err)
@@ -51,6 +67,9 @@ func (db *Database) GetAllGeneric() []interface{} {
 }
 
 func (db *Database) Get(id string) Noodle {
+	db.mu.Lock()
+	defer db.mu.Unlock()
+
 	var item Noodle
 	log.Printf("Looking up noodle key='%s'", id)
 	log.Printf("key='%s' exists=%t", id, db.Handle.Has(id))
@@ -62,6 +81,20 @@ func (db *Database) Get(id string) Noodle {
 }
 
 func (db *Database) Add(item Noodle) error {
+	db.mu.Lock()
+	defer db.mu.Unlock()
+
+	if err := db.Handle.Add(item.Id, item); err != nil {
+		log.Print(err)
+		return err
+	}
+	return nil
+}
+
+func (db *Database) Update(item Noodle) error {
+	db.mu.Lock()
+	defer db.mu.Unlock()
+
 	if err := db.Handle.Add(item.Id, item); err != nil {
 		log.Print(err)
 		return err
@@ -70,6 +103,9 @@ func (db *Database) Add(item Noodle) error {
 }
 
 func (db *Database) Delete(id string) error {
+	db.mu.Lock()
+	defer db.mu.Unlock()
+
 	if err := db.Handle.Delete(id); err != nil {
 		log.Print(err)
 		return err
@@ -80,3 +116,248 @@ func (db *Database) Delete(id string) error {
 func (db *Database) Close() error {
 	return db.connection.Close()
 }
+
+func (db *Database) GetAllUsers() []User {
+	db.mu.Lock()
+	defer db.mu.Unlock()
+
+	var data []User
+	if err := db.Users.List(&data); err != nil {
+		log.Print(err)
+		return nil
+	}
+	return data
+}
+
+func (db *Database) GetUserByUsername(username string) (User, error) {
+	db.mu.Lock()
+	defer db.mu.Unlock()
+
+	var data []User
+	if err := db.Users.List(&data); err != nil {
+		log.Print(err)
+		return User{}, err
+	}
+
+	for _, user := range data {
+		if user.Username == username {
+			return user, nil
+		}
+	}
+
+	return User{}, ErrUserNotFound
+}
+
+func (db *Database) AddUser(user User) error {
+	db.mu.Lock()
+	defer db.mu.Unlock()
+
+	var data []User
+	if err := db.Users.List(&data); err != nil {
+		log.Print(err)
+		return err
+	}
+	for _, existing := range data {
+		if existing.Username == user.Username {
+			return fmt.Errorf("user %q already exists", user.Username)
+		}
+	}
+
+	if err := db.Users.Add(user.Id, user); err != nil {
+		log.Print(err)
+		return err
+	}
+	return nil
+}
+
+func (db *Database) UpdateUser(user User) error {
+	db.mu.Lock()
+	defer db.mu.Unlock()
+
+	if err := db.Users.Add(user.Id, user); err != nil {
+		log.Print(err)
+		return err
+	}
+	return nil
+}
+
+func (db *Database) SetUserRole(username, role string) (User, error) {
+	db.mu.Lock()
+	defer db.mu.Unlock()
+
+	var data []User
+	if err := db.Users.List(&data); err != nil {
+		log.Print(err)
+		return User{}, err
+	}
+
+	var target User
+	found := false
+	adminCount := 0
+	for _, user := range data {
+		if user.Role == UserRoleAdmin {
+			adminCount++
+		}
+		if user.Username == username {
+			target = user
+			found = true
+		}
+	}
+
+	if !found {
+		return User{}, ErrUserNotFound
+	}
+	if target.Role == UserRoleAdmin && role != UserRoleAdmin && adminCount <= 1 {
+		return User{}, ErrLastAdminRemoval
+	}
+
+	target.Role = role
+	if err := db.Users.Add(target.Id, target); err != nil {
+		log.Print(err)
+		return User{}, err
+	}
+	return target, nil
+}
+
+func (db *Database) SetUserPassword(username, passwordHash string) (User, error) {
+	db.mu.Lock()
+	defer db.mu.Unlock()
+
+	var data []User
+	if err := db.Users.List(&data); err != nil {
+		log.Print(err)
+		return User{}, err
+	}
+
+	for _, user := range data {
+		if user.Username != username {
+			continue
+		}
+		user.PasswordHash = passwordHash
+		if err := db.Users.Add(user.Id, user); err != nil {
+			log.Print(err)
+			return User{}, err
+		}
+		return user, nil
+	}
+
+	return User{}, ErrUserNotFound
+}
+
+func (db *Database) DeleteUser(username string) (User, error) {
+	db.mu.Lock()
+	defer db.mu.Unlock()
+
+	var data []User
+	if err := db.Users.List(&data); err != nil {
+		log.Print(err)
+		return User{}, err
+	}
+
+	var target User
+	found := false
+	adminCount := 0
+	for _, user := range data {
+		if user.Role == UserRoleAdmin {
+			adminCount++
+		}
+		if user.Username == username {
+			target = user
+			found = true
+		}
+	}
+
+	if !found {
+		return User{}, ErrUserNotFound
+	}
+	if target.Role == UserRoleAdmin && adminCount <= 1 {
+		return User{}, ErrLastAdminRemoval
+	}
+
+	if err := db.Users.Delete(target.Id); err != nil {
+		log.Print(err)
+		return User{}, err
+	}
+	return target, nil
+}
+
+func (db *Database) SetIsUp(id string, isUp bool) (Noodle, error) {
+	db.mu.Lock()
+	defer db.mu.Unlock()
+
+	var item Noodle
+	if err := db.Handle.Get(id, &item); err != nil {
+		log.Print(err)
+		return Noodle{}, err
+	}
+
+	item.IsUp = isUp
+	if err := db.Handle.Add(item.Id, item); err != nil {
+		log.Print(err)
+		return Noodle{}, err
+	}
+
+	return item, nil
+}
+
+func (db *Database) DeleteByID(id string) (Noodle, error) {
+	db.mu.Lock()
+	defer db.mu.Unlock()
+
+	var item Noodle
+	if err := db.Handle.Get(id, &item); err != nil {
+		log.Print(err)
+		return Noodle{}, err
+	}
+
+	if err := db.Handle.Delete(id); err != nil {
+		log.Print(err)
+		return Noodle{}, err
+	}
+
+	return item, nil
+}
+
+func (db *Database) TickExpirations() []Noodle {
+	db.mu.Lock()
+	defer db.mu.Unlock()
+
+	var noodles []Noodle
+	if err := db.Handle.List(&noodles); err != nil {
+		log.Print(err)
+		return nil
+	}
+
+	var stopped []Noodle
+	for _, item := range noodles {
+		if !item.IsUp {
+			continue
+		}
+
+		if item.Expiration <= 0 {
+			item.IsUp = false
+			stopped = append(stopped, item)
+			if err := db.Handle.Delete(item.Id); err != nil {
+				log.Print(err)
+			}
+			continue
+		}
+
+		item.Expiration -= time.Second
+		if item.Expiration <= 0 {
+			item.Expiration = 0
+			item.IsUp = false
+			stopped = append(stopped, item)
+			if err := db.Handle.Delete(item.Id); err != nil {
+				log.Print(err)
+			}
+			continue
+		}
+
+		if err := db.Handle.Add(item.Id, item); err != nil {
+			log.Print(err)
+		}
+	}
+
+	return stopped
+}

internal/noodle/model.go

@@ -1,12 +1,29 @@
 package noodle
 
+import "time"
+
+const (
+	UserRoleRegular = "regular"
+	UserRoleAdmin   = "admin"
+)
+
 type Noodle struct {
 	Id         string
 	Name       string
 	Proto      string
+	Src        string
 	ListenPort int
 	DestPort   int
 	DestHost   string
-	Expiration int
+	Expiration time.Duration
 	IsUp       bool
+	CreatedBy  string
+}
+
+type User struct {
+	Id           string
+	Username     string
+	Role         string
+	PasswordHash string
+	CreatedAt    time.Time
 }

internal/web/auth.go

@@ -0,0 +1,278 @@
+package web
+
+import (
+	"crypto/hmac"
+	"crypto/rand"
+	"crypto/sha256"
+	"encoding/base64"
+	"encoding/hex"
+	"errors"
+	"fmt"
+	"html/template"
+	"log"
+	"net/http"
+	"strings"
+	"time"
+
+	"infinite-noodle/internal/assets"
+	"infinite-noodle/internal/noodle"
+)
+
+const sessionCookieName = "infinite_noodle_session"
+
+var errInvalidCredentials = errors.New("invalid credentials")
+
+type Auth struct {
+	db     *noodle.Database
+	secret []byte
+}
+
+type loginPageData struct {
+	Error string
+}
+
+type authUser struct {
+	Username string
+	Role     string
+}
+
+func NewAuth(db *noodle.Database) (*Auth, error) {
+	secret := make([]byte, 32)
+	if _, err := rand.Read(secret); err != nil {
+		return nil, err
+	}
+	return &Auth{
+		db:     db,
+		secret: secret,
+	}, nil
+}
+
+func HashPassword(password string) string {
+	sum := sha256.Sum256([]byte(password))
+	return hex.EncodeToString(sum[:])
+}
+
+func (a *Auth) EnsureDefaultUser() error {
+	users := a.db.GetAllUsers()
+	if len(users) == 0 {
+		user := noodle.User{
+			Id:           a.db.MakeID(),
+			Username:     "admin",
+			Role:         noodle.UserRoleAdmin,
+			PasswordHash: HashPassword("admin"),
+			CreatedAt:    time.Now().UTC(),
+		}
+		if err := a.db.AddUser(user); err != nil {
+			return err
+		}
+
+		log.Printf("Created default user username=%q password=%q", user.Username, "admin")
+		return nil
+	}
+
+	var hasAdmin bool
+	for _, user := range users {
+		updated := false
+		if user.Role == "" {
+			user.Role = noodle.UserRoleRegular
+			updated = true
+		}
+		if user.Username == "admin" {
+			user.Role = noodle.UserRoleAdmin
+			updated = true
+		}
+		if updated {
+			if err := a.db.UpdateUser(user); err != nil {
+				return err
+			}
+		}
+		if user.Role == noodle.UserRoleAdmin {
+			hasAdmin = true
+		}
+	}
+	if hasAdmin {
+		return nil
+	}
+
+	user := noodle.User{
+		Id:           a.db.MakeID(),
+		Username:     "admin",
+		Role:         noodle.UserRoleAdmin,
+		PasswordHash: HashPassword("admin"),
+		CreatedAt:    time.Now().UTC(),
+	}
+	if err := a.db.AddUser(user); err != nil {
+		return err
+	}
+
+	log.Printf("Created fallback admin user username=%q password=%q", user.Username, "admin")
+	return nil
+}
+
+func (a *Auth) RequireAuth(next http.HandlerFunc) http.HandlerFunc {
+	return func(w http.ResponseWriter, req *http.Request) {
+		if _, ok := a.CurrentUser(req); !ok {
+			http.Redirect(w, req, "/login", http.StatusSeeOther)
+			return
+		}
+		next(w, req)
+	}
+}
+
+func (a *Auth) RequireAdmin(next http.HandlerFunc) http.HandlerFunc {
+	return func(w http.ResponseWriter, req *http.Request) {
+		user, ok := a.CurrentUser(req)
+		if !ok {
+			http.Redirect(w, req, "/login", http.StatusSeeOther)
+			return
+		}
+		if user.Role != noodle.UserRoleAdmin {
+			http.Error(w, "admin access required", http.StatusForbidden)
+			return
+		}
+		next(w, req)
+	}
+}
+
+func (a *Auth) CurrentUser(req *http.Request) (authUser, bool) {
+	cookie, err := req.Cookie(sessionCookieName)
+	if err != nil {
+		return authUser{}, false
+	}
+
+	username, ok := a.verifyCookieValue(cookie.Value)
+	if !ok {
+		return authUser{}, false
+	}
+
+	user, err := a.db.GetUserByUsername(username)
+	if err != nil || user.Username == "" {
+		return authUser{}, false
+	}
+	role := user.Role
+	if role == "" {
+		role = noodle.UserRoleRegular
+	}
+
+	return authUser{
+		Username: user.Username,
+		Role:     role,
+	}, true
+}
+
+func (a *Auth) HandleLogin() http.HandlerFunc {
+	tmpl, err := template.ParseFS(assets.FS, "templates/*.html")
+	if err != nil {
+		log.Fatalf("Error parsing templates: %v", err)
+	}
+
+	return func(w http.ResponseWriter, req *http.Request) {
+		if req.Method == http.MethodGet {
+			if _, ok := a.CurrentUser(req); ok {
+				http.Redirect(w, req, "/", http.StatusSeeOther)
+				return
+			}
+			if err := tmpl.ExecuteTemplate(w, "login.html", loginPageData{}); err != nil {
+				http.Error(w, err.Error(), http.StatusInternalServerError)
+			}
+			return
+		}
+
+		if req.Method != http.MethodPost {
+			http.Error(w, "", http.StatusMethodNotAllowed)
+			return
+		}
+
+		if err := req.ParseForm(); err != nil {
+			http.Error(w, err.Error(), http.StatusBadRequest)
+			return
+		}
+
+		username := strings.TrimSpace(req.FormValue("username"))
+		password := req.FormValue("password")
+		if username == "" || password == "" {
+			w.WriteHeader(http.StatusUnauthorized)
+			if err := tmpl.ExecuteTemplate(w, "login.html", loginPageData{Error: "Username and password are required."}); err != nil {
+				http.Error(w, err.Error(), http.StatusInternalServerError)
+			}
+			return
+		}
+
+		if err := a.Login(w, username, password); err != nil {
+			w.WriteHeader(http.StatusUnauthorized)
+			if err := tmpl.ExecuteTemplate(w, "login.html", loginPageData{Error: "Invalid username or password."}); err != nil {
+				http.Error(w, err.Error(), http.StatusInternalServerError)
+			}
+			return
+		}
+
+		http.Redirect(w, req, "/", http.StatusSeeOther)
+	}
+}
+
+func (a *Auth) HandleLogout() http.HandlerFunc {
+	return func(w http.ResponseWriter, req *http.Request) {
+		if req.Method != http.MethodPost {
+			http.Error(w, "", http.StatusMethodNotAllowed)
+			return
+		}
+
+		a.ClearSession(w)
+		http.Redirect(w, req, "/login", http.StatusSeeOther)
+	}
+}
+
+func (a *Auth) Login(w http.ResponseWriter, username, password string) error {
+	user, err := a.db.GetUserByUsername(username)
+	if err != nil {
+		return errInvalidCredentials
+	}
+
+	if user.PasswordHash != HashPassword(password) {
+		return errInvalidCredentials
+	}
+
+	http.SetCookie(w, &http.Cookie{
+		Name:     sessionCookieName,
+		Value:    a.cookieValue(username),
+		Path:     "/",
+		HttpOnly: true,
+		SameSite: http.SameSiteLaxMode,
+		MaxAge:   int((24 * time.Hour).Seconds()),
+	})
+	return nil
+}
+
+func (a *Auth) ClearSession(w http.ResponseWriter) {
+	http.SetCookie(w, &http.Cookie{
+		Name:     sessionCookieName,
+		Value:    "",
+		Path:     "/",
+		HttpOnly: true,
+		SameSite: http.SameSiteLaxMode,
+		MaxAge:   -1,
+	})
+}
+
+func (a *Auth) cookieValue(username string) string {
+	mac := hmac.New(sha256.New, a.secret)
+	mac.Write([]byte(username))
+	sig := mac.Sum(nil)
+	payload := fmt.Sprintf("%s:%s", username, hex.EncodeToString(sig))
+	return base64.RawURLEncoding.EncodeToString([]byte(payload))
+}
+
+func (a *Auth) verifyCookieValue(value string) (string, bool) {
+	decoded, err := base64.RawURLEncoding.DecodeString(value)
+	if err != nil {
+		return "", false
+	}
+
+	parts := strings.SplitN(string(decoded), ":", 2)
+	if len(parts) != 2 || parts[0] == "" {
+		return "", false
+	}
+
+	expected := a.cookieValue(parts[0])
+	return parts[0], hmac.Equal([]byte(expected), []byte(value))
+}

internal/web/handlers.go

@@ -4,7 +4,11 @@ import (
 	"html/template"
 	"io/fs"
 	"log"
+	"net"
 	"net/http"
+	"strconv"
+	"strings"
+	"time"
 
 	"infinite-noodle/internal/assets"
 	"infinite-noodle/internal/noodle"
@@ -14,43 +18,462 @@ func StaticFiles() fs.FS {
 	return assets.FS
 }
 
-func HandleMain(db *noodle.Database, pc *chan noodle.Noodle) func(w http.ResponseWriter, req *http.Request) {
+type indexPageData struct {
+	Username string
+	Role     string
+	ClientIP string
+	Noodles  []noodle.Noodle
+}
+
+type userConfigPageData struct {
+	Username string
+	Role     string
+	Users    []noodle.User
+	Error    string
+}
+
+func HandleMain(db *noodle.Database, pc *chan noodle.Noodle, auth *Auth) func(w http.ResponseWriter, req *http.Request) {
 	tmpl, err := template.ParseFS(assets.FS, "templates/*.html")
 	if err != nil {
 		log.Fatalf("Error parsing templates: %v", err)
 	}
 	return func(w http.ResponseWriter, req *http.Request) {
-		data := db.GetAll()
+		currentUser, _ := auth.CurrentUser(req)
+		data := indexPageData{
+			Username: currentUser.Username,
+			Role:     currentUser.Role,
+			ClientIP: clientIPFromRequest(req),
+			Noodles:  db.GetAll(),
+		}
 		if err := tmpl.ExecuteTemplate(w, "index.html", data); err != nil {
 			http.Error(w, err.Error(), http.StatusInternalServerError)
 		}
 	}
 }
 
-func HandleDelete(db *noodle.Database, pc *chan noodle.Noodle) func(w http.ResponseWriter, req *http.Request) {
-	return func(w http.ResponseWriter, req *http.Request) {
-		q := req.URL.Query()
-		vals, ok := q["id"]
-		if ok {
-			id := vals[0]
-			item := db.Get(id)
-			item.IsUp = false
-			*pc <- item
-			log.Printf("Deleting noodle=%v", item)
-			db.Delete(item.Id)
-		}
+func HandleUsers(auth *Auth, db *noodle.Database) func(w http.ResponseWriter, req *http.Request) {
+	tmpl, err := template.ParseFS(assets.FS, "templates/*.html")
+	if err != nil {
+		log.Fatalf("Error parsing templates: %v", err)
+	}
 
-		http.Redirect(w, req, "/", http.StatusTemporaryRedirect)
+	return func(w http.ResponseWriter, req *http.Request) {
+		currentUser, _ := auth.CurrentUser(req)
+		data := userConfigPageData{
+			Username: currentUser.Username,
+			Role:     currentUser.Role,
+		}
+		if currentUser.Role == noodle.UserRoleAdmin {
+			data.Users = db.GetAllUsers()
+		}
+		if err := tmpl.ExecuteTemplate(w, "users.html", data); err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+		}
 	}
 }
 
-func HandleAdd(db *noodle.Database, pc *chan noodle.Noodle) func(w http.ResponseWriter, req *http.Request) {
+func HandleAddUser(auth *Auth, db *noodle.Database) func(w http.ResponseWriter, req *http.Request) {
+	tmpl, err := template.ParseFS(assets.FS, "templates/*.html")
+	if err != nil {
+		log.Fatalf("Error parsing templates: %v", err)
+	}
+
+	return func(w http.ResponseWriter, req *http.Request) {
+		currentUser, _ := auth.CurrentUser(req)
+		if req.Method != http.MethodPost {
+			http.Error(w, "", http.StatusMethodNotAllowed)
+			return
+		}
+
+		if err := req.ParseForm(); err != nil {
+			http.Error(w, err.Error(), http.StatusBadRequest)
+			return
+		}
+
+		username := strings.TrimSpace(req.FormValue("username"))
+		password := req.FormValue("password")
+		role := normalizeUserRole(req.FormValue("role"))
+		if username == "" || password == "" {
+			renderUsersPage(w, tmpl, db, currentUser, "username and password are required", http.StatusBadRequest)
+			return
+		}
+		if role == "" {
+			renderUsersPage(w, tmpl, db, currentUser, "invalid user role", http.StatusBadRequest)
+			return
+		}
+
+		user := noodle.User{
+			Id:           db.MakeID(),
+			Username:     username,
+			Role:         role,
+			PasswordHash: HashPassword(password),
+			CreatedAt:    time.Now().UTC(),
+		}
+		if err := db.AddUser(user); err != nil {
+			renderUsersPage(w, tmpl, db, currentUser, err.Error(), http.StatusBadRequest)
+			return
+		}
+
+		http.Redirect(w, req, "/users", http.StatusSeeOther)
+	}
+}
+
+func HandleSetUserRole(auth *Auth, db *noodle.Database) func(w http.ResponseWriter, req *http.Request) {
+	tmpl, err := template.ParseFS(assets.FS, "templates/*.html")
+	if err != nil {
+		log.Fatalf("Error parsing templates: %v", err)
+	}
+
+	return func(w http.ResponseWriter, req *http.Request) {
+		currentUser, _ := auth.CurrentUser(req)
+		if req.Method != http.MethodPost {
+			http.Error(w, "", http.StatusMethodNotAllowed)
+			return
+		}
+
+		if err := req.ParseForm(); err != nil {
+			http.Error(w, err.Error(), http.StatusBadRequest)
+			return
+		}
+
+		username := strings.TrimSpace(req.FormValue("username"))
+		role := normalizeUserRole(req.FormValue("role"))
+		if username == "" {
+			renderUsersPage(w, tmpl, db, currentUser, "username is required", http.StatusBadRequest)
+			return
+		}
+		if role == "" {
+			renderUsersPage(w, tmpl, db, currentUser, "invalid user role", http.StatusBadRequest)
+			return
+		}
+
+		if _, err := db.SetUserRole(username, role); err != nil {
+			renderUsersPage(w, tmpl, db, currentUser, err.Error(), http.StatusBadRequest)
+			return
+		}
+
+		http.Redirect(w, req, "/users", http.StatusSeeOther)
+	}
+}
+
+func HandleChangePassword(auth *Auth, db *noodle.Database) func(w http.ResponseWriter, req *http.Request) {
+	tmpl, err := template.ParseFS(assets.FS, "templates/*.html")
+	if err != nil {
+		log.Fatalf("Error parsing templates: %v", err)
+	}
+
+	return func(w http.ResponseWriter, req *http.Request) {
+		currentUser, _ := auth.CurrentUser(req)
+		if req.Method != http.MethodPost {
+			http.Error(w, "", http.StatusMethodNotAllowed)
+			return
+		}
+
+		if err := req.ParseForm(); err != nil {
+			http.Error(w, err.Error(), http.StatusBadRequest)
+			return
+		}
+
+		targetUsername := strings.TrimSpace(req.FormValue("username"))
+		password := req.FormValue("password")
+		confirmPassword := req.FormValue("confirm_password")
+		if targetUsername == "" || password == "" {
+			renderUsersPage(w, tmpl, db, currentUser, "username and password are required", http.StatusBadRequest)
+			return
+		}
+		if confirmPassword != "" && password != confirmPassword {
+			renderUsersPage(w, tmpl, db, currentUser, "password confirmation does not match", http.StatusBadRequest)
+			return
+		}
+		if currentUser.Role != noodle.UserRoleAdmin && targetUsername != currentUser.Username {
+			http.Error(w, "cannot change another user's password", http.StatusForbidden)
+			return
+		}
+
+		if _, err := db.SetUserPassword(targetUsername, HashPassword(password)); err != nil {
+			renderUsersPage(w, tmpl, db, currentUser, err.Error(), http.StatusBadRequest)
+			return
+		}
+
+		http.Redirect(w, req, "/users", http.StatusSeeOther)
+	}
+}
+
+func HandleDeleteUser(auth *Auth, db *noodle.Database) func(w http.ResponseWriter, req *http.Request) {
+	tmpl, err := template.ParseFS(assets.FS, "templates/*.html")
+	if err != nil {
+		log.Fatalf("Error parsing templates: %v", err)
+	}
+
+	return func(w http.ResponseWriter, req *http.Request) {
+		currentUser, _ := auth.CurrentUser(req)
+		if req.Method != http.MethodPost {
+			http.Error(w, "", http.StatusMethodNotAllowed)
+			return
+		}
+		if currentUser.Role != noodle.UserRoleAdmin {
+			http.Error(w, "admin access required", http.StatusForbidden)
+			return
+		}
+
+		if err := req.ParseForm(); err != nil {
+			http.Error(w, err.Error(), http.StatusBadRequest)
+			return
+		}
+
+		username := strings.TrimSpace(req.FormValue("username"))
+		if username == "" {
+			renderUsersPage(w, tmpl, db, currentUser, "username is required", http.StatusBadRequest)
+			return
+		}
+
+		if _, err := db.DeleteUser(username); err != nil {
+			renderUsersPage(w, tmpl, db, currentUser, err.Error(), http.StatusBadRequest)
+			return
+		}
+
+		if username == currentUser.Username {
+			auth.ClearSession(w)
+			http.Redirect(w, req, "/login", http.StatusSeeOther)
+			return
+		}
+
+		http.Redirect(w, req, "/users", http.StatusSeeOther)
+	}
+}
+
+func HandleDelete(db *noodle.Database, pc *chan noodle.Noodle) func(w http.ResponseWriter, req *http.Request) {
 	return func(w http.ResponseWriter, req *http.Request) {
 		if req.Method != http.MethodPost {
 			http.Error(w, "", http.StatusMethodNotAllowed)
 			return
 		}
 
+		if err := req.ParseForm(); err != nil {
+			http.Error(w, err.Error(), http.StatusBadRequest)
+			return
+		}
+
+		id := strings.TrimSpace(req.FormValue("id"))
+		if id == "" {
+			http.Error(w, "missing noodle id", http.StatusBadRequest)
+			return
+		}
+
+		item, err := db.DeleteByID(id)
+		if err != nil {
+			http.Error(w, "noodle not found", http.StatusNotFound)
+			return
+		}
+		item.IsUp = false
+		*pc <- item
+		log.Printf("Deleting noodle=%v", item)
+
 		http.Redirect(w, req, "/", http.StatusTemporaryRedirect)
 	}
 }
+
+func HandleAdd(db *noodle.Database, pc *chan noodle.Noodle, auth *Auth) func(w http.ResponseWriter, req *http.Request) {
+	return func(w http.ResponseWriter, req *http.Request) {
+		currentUser, _ := auth.CurrentUser(req)
+		if req.Method != http.MethodPost {
+			http.Error(w, "", http.StatusMethodNotAllowed)
+			return
+		}
+
+		if err := req.ParseForm(); err != nil {
+			http.Error(w, err.Error(), http.StatusBadRequest)
+			return
+		}
+
+		listenPort, err := strconv.Atoi(strings.TrimSpace(req.FormValue("listen_port")))
+		if err != nil {
+			http.Error(w, "invalid listen port", http.StatusBadRequest)
+			return
+		}
+		if !isValidPort(listenPort) {
+			http.Error(w, "listen port must be between 1 and 65535", http.StatusBadRequest)
+			return
+		}
+
+		destPort, err := strconv.Atoi(strings.TrimSpace(req.FormValue("dest_port")))
+		if err != nil {
+			http.Error(w, "invalid destination port", http.StatusBadRequest)
+			return
+		}
+		if !isValidPort(destPort) {
+			http.Error(w, "destination port must be between 1 and 65535", http.StatusBadRequest)
+			return
+		}
+
+		expiration, err := time.ParseDuration(strings.TrimSpace(req.FormValue("expiration")))
+		if err != nil {
+			http.Error(w, "invalid expiration duration", http.StatusBadRequest)
+			return
+		}
+
+		proto := strings.ToUpper(strings.TrimSpace(req.FormValue("proto")))
+		if proto != "TCP" && proto != "UDP" {
+			http.Error(w, "invalid protocol", http.StatusBadRequest)
+			return
+		}
+
+		src, err := normalizeSourceList(req.FormValue("src"))
+		if err != nil {
+			http.Error(w, "invalid source restriction", http.StatusBadRequest)
+			return
+		}
+
+		destHost := strings.TrimSpace(req.FormValue("dest_host"))
+		if destHost == "" {
+			http.Error(w, "destination host is required", http.StatusBadRequest)
+			return
+		}
+
+		item := noodle.Noodle{
+			Id:         db.MakeID(),
+			Name:       strings.TrimSpace(req.FormValue("name")),
+			Proto:      proto,
+			Src:        src,
+			ListenPort: listenPort,
+			DestPort:   destPort,
+			DestHost:   destHost,
+			Expiration: expiration,
+			IsUp:       true,
+			CreatedBy:  currentUser.Username,
+		}
+		if err := db.Add(item); err != nil {
+			http.Error(w, err.Error(), http.StatusInternalServerError)
+			return
+		}
+		*pc <- item
+
+		http.Redirect(w, req, "/", http.StatusTemporaryRedirect)
+	}
+}
+
+func HandleToggle(db *noodle.Database, pc *chan noodle.Noodle) func(w http.ResponseWriter, req *http.Request) {
+	return func(w http.ResponseWriter, req *http.Request) {
+		if req.Method != http.MethodPost {
+			http.Error(w, "", http.StatusMethodNotAllowed)
+			return
+		}
+
+		if err := req.ParseForm(); err != nil {
+			http.Error(w, err.Error(), http.StatusBadRequest)
+			return
+		}
+
+		id := strings.TrimSpace(req.FormValue("id"))
+		if id == "" {
+			http.Error(w, "missing noodle id", http.StatusBadRequest)
+			return
+		}
+
+		item, err := db.SetIsUp(id, req.FormValue("is_up") == "on")
+		if err != nil {
+			http.Error(w, "noodle not found", http.StatusNotFound)
+			return
+		}
+		*pc <- item
+
+		http.Redirect(w, req, "/", http.StatusTemporaryRedirect)
+	}
+}
+
+func clientIPFromRequest(req *http.Request) string {
+	forwardedFor := strings.TrimSpace(req.Header.Get("X-Forwarded-For"))
+	if forwardedFor != "" {
+		parts := strings.Split(forwardedFor, ",")
+		ip := strings.TrimSpace(parts[0])
+		if parsed := net.ParseIP(ip); parsed != nil {
+			return parsed.String()
+		}
+	}
+
+	realIP := strings.TrimSpace(req.Header.Get("X-Real-Ip"))
+	if realIP != "" {
+		if parsed := net.ParseIP(realIP); parsed != nil {
+			return parsed.String()
+		}
+	}
+
+	host, _, err := net.SplitHostPort(strings.TrimSpace(req.RemoteAddr))
+	if err == nil {
+		if parsed := net.ParseIP(host); parsed != nil {
+			return parsed.String()
+		}
+	}
+
+	if parsed := net.ParseIP(strings.TrimSpace(req.RemoteAddr)); parsed != nil {
+		return parsed.String()
+	}
+
+	return "127.0.0.1"
+}
+
+func isValidPort(port int) bool {
+	return port >= 1 && port <= 65535
+}
+
+func normalizeSourceList(raw string) (string, error) {
+	raw = strings.TrimSpace(raw)
+	if raw == "" {
+		return "", nil
+	}
+	if strings.EqualFold(raw, "All") {
+		return "All", nil
+	}
+
+	parts := strings.Split(raw, ",")
+	normalized := make([]string, 0, len(parts))
+	for _, part := range parts {
+		entry := strings.TrimSpace(part)
+		if entry == "" {
+			return "", net.InvalidAddrError("empty source")
+		}
+
+		if strings.Contains(entry, "/") {
+			_, network, err := net.ParseCIDR(entry)
+			if err != nil {
+				return "", err
+			}
+			normalized = append(normalized, network.String())
+			continue
+		}
+
+		parsed := net.ParseIP(entry)
+		if parsed == nil {
+			return "", net.InvalidAddrError(entry)
+		}
+		normalized = append(normalized, parsed.String())
+	}
+
+	return strings.Join(normalized, ", "), nil
+}
+
+func normalizeUserRole(role string) string {
+	switch strings.ToLower(strings.TrimSpace(role)) {
+	case noodle.UserRoleAdmin:
+		return noodle.UserRoleAdmin
+	case noodle.UserRoleRegular:
+		return noodle.UserRoleRegular
+	default:
+		return ""
+	}
+}
+
+func renderUsersPage(w http.ResponseWriter, tmpl *template.Template, db *noodle.Database, currentUser authUser, message string, status int) {
+	w.WriteHeader(status)
+	data := userConfigPageData{
+		Username: currentUser.Username,
+		Role:     currentUser.Role,
+		Error:    message,
+	}
+	if currentUser.Role == noodle.UserRoleAdmin {
+		data.Users = db.GetAllUsers()
+	}
+	if err := tmpl.ExecuteTemplate(w, "users.html", data); err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+	}
+}