577 lines
19 KiB
Go
577 lines
19 KiB
Go
package web
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import (
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"context"
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"crypto/sha256"
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"embed"
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"encoding/hex"
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"fmt"
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"html/template"
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"log"
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"net"
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"net/http"
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"net/url"
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"os"
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"path/filepath"
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"regexp"
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"strconv"
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"strings"
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"time"
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"unicode/utf8"
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"ts3monolith/internal/config"
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"ts3monolith/internal/rrd"
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"ts3monolith/internal/ts3"
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)
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//go:embed templates/*.html assets/*
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var embedded embed.FS
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// assetHashes maps a plain asset filename ("app.css") to a short content
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// hash, computed once at startup from the embedded file bytes. Templates
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// reference assets through the "asset" func (assetURL below), which builds
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// a hashed URL such as /assets/app.a1b2c3d4e5.css; the asset handler then
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// serves that URL with a one-year immutable Cache-Control, since a content
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// change always produces a new hash (and therefore a new URL) rather than
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// invalidating a cached one.
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var assetHashes = map[string]string{}
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func init() {
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for _, name := range []string{"app.css", "app.js"} {
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data, err := embedded.ReadFile("assets/" + name)
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if err != nil {
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continue
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}
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sum := sha256.Sum256(data)
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assetHashes[name] = hex.EncodeToString(sum[:])[:10]
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}
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}
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// assetURL returns the cache-busted URL for a static asset, falling back to
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// the plain /assets/<name> path if no hash was computed for it.
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func assetURL(name string) string {
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hash, ok := assetHashes[name]
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if !ok {
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return "/assets/" + name
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}
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ext := filepath.Ext(name)
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base := strings.TrimSuffix(name, ext)
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return "/assets/" + base + "." + hash + ext
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}
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type Server struct {
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cfg config.Config
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ts *ts3.Query
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rrd *rrd.Manager
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tpl *template.Template
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tokens *tokenManager
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limit *limiter
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}
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type channelPage struct {
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ClientIP string
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Clients []ts3.Client
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Client *ts3.Client
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ClientToken string
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FormToken string
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ChallengeToken string
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Error string
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Success string
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ChannelID int
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VoiceURL template.URL
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Name string
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Topic string
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MaxClients string
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CodecQuality string
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}
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type statsPage struct {
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Current int
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VoiceURL template.URL
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Ranges []rrd.Range
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ServerName string
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ServerVersion string
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ServerPlatform string
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Uptime string
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MaxClients int
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InfoAvailable bool
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}
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func New(cfg config.Config, tq *ts3.Query, rm *rrd.Manager) (*Server, error) {
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tpl, err := template.New("").Funcs(template.FuncMap{"asset": assetURL}).ParseFS(embedded, "templates/*.html")
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if err != nil {
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return nil, err
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}
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return &Server{cfg: cfg, ts: tq, rrd: rm, tpl: tpl, tokens: newTokenManager(cfg.AppSecret), limit: newLimiter()}, nil
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}
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func (s *Server) Handler() http.Handler {
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mux := http.NewServeMux()
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mux.HandleFunc("GET /assets/{file}", s.asset)
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mux.HandleFunc("GET /{$}", func(w http.ResponseWriter, r *http.Request) { http.Redirect(w, r, "/stats", http.StatusFound) })
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mux.HandleFunc("GET /stats", s.stats)
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mux.HandleFunc("GET /stats/live", s.statsLive)
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mux.HandleFunc("GET /graph/{file}", s.graph)
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mux.HandleFunc("GET /channel", s.channel)
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mux.HandleFunc("GET /embed/channel", s.channel)
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mux.HandleFunc("POST /channel/verify/start", s.verifyStart)
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mux.HandleFunc("POST /channel/verify/complete", s.verifyComplete)
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mux.HandleFunc("POST /channel/create", s.createChannel)
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mux.HandleFunc("GET /healthz", func(w http.ResponseWriter, _ *http.Request) {
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w.Header().Set("Content-Type", "text/plain; charset=utf-8")
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_, _ = w.Write([]byte("ok\n"))
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})
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return s.security(mux)
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}
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func (s *Server) security(next http.Handler) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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w.Header().Set("X-Content-Type-Options", "nosniff")
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w.Header().Set("Referrer-Policy", "no-referrer")
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w.Header().Set("Permissions-Policy", "camera=(), microphone=(), geolocation=(), payment=(), usb=()")
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w.Header().Set("Cross-Origin-Opener-Policy", "same-origin")
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if s.cfg.HTTPSOnly {
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w.Header().Set("Strict-Transport-Security", "max-age=31536000")
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}
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frame := "'none'"
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if strings.HasPrefix(r.URL.Path, "/embed/channel") || strings.HasPrefix(r.URL.Path, "/channel/") {
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frame = strings.Join(s.cfg.FrameAncestors, " ")
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}
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w.Header().Set("Content-Security-Policy", "default-src 'self'; base-uri 'none'; object-src 'none'; frame-ancestors "+frame+"; form-action 'self'; img-src 'self'; style-src 'self'; script-src 'self'")
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next.ServeHTTP(w, r)
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})
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}
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func (s *Server) stats(w http.ResponseWriter, r *http.Request) {
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ip := s.clientIP(r).String()
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if !s.limit.allow("stats|"+ip, 60, time.Minute) {
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s.tooMany(w)
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return
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}
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ctx, cancel := context.WithTimeout(r.Context(), s.cfg.TSQueryTimeout)
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defer cancel()
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current, err := s.ts.CountOnline(ctx)
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if err != nil {
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ctx2, cancel2 := context.WithTimeout(r.Context(), 2*time.Second)
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defer cancel2()
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current, _ = s.rrd.Last(ctx2)
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}
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p := statsPage{Current: current, VoiceURL: s.voiceURL(), Ranges: rrd.Ranges}
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ctx3, cancel3 := context.WithTimeout(r.Context(), s.cfg.TSQueryTimeout)
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defer cancel3()
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if info, err := s.ts.ServerInfo(ctx3); err == nil {
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p.InfoAvailable = true
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p.ServerName = info.Name
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p.ServerVersion = info.Version
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p.ServerPlatform = info.Platform
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p.Uptime = formatUptime(info.Uptime)
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p.MaxClients = info.MaxClients
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}
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w.Header().Set("Cache-Control", "no-store")
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s.render(w, "stats.html", p)
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}
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func (s *Server) statsLive(w http.ResponseWriter, r *http.Request) {
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ip := s.clientIP(r).String()
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if !s.limit.allow("statslive|"+ip, 60, time.Minute) {
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s.tooMany(w)
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return
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}
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ctx, cancel := context.WithTimeout(r.Context(), s.cfg.TSQueryTimeout)
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defer cancel()
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current, err := s.ts.CountOnline(ctx)
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if err != nil {
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ctx2, cancel2 := context.WithTimeout(r.Context(), 2*time.Second)
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defer cancel2()
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current, _ = s.rrd.Last(ctx2)
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}
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w.Header().Set("Cache-Control", "no-store")
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w.Header().Set("Content-Type", "application/json; charset=utf-8")
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_, _ = fmt.Fprintf(w, `{"current":%d}`, current)
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}
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func formatUptime(d time.Duration) string {
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if d <= 0 {
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return "—"
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}
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days := int(d.Hours()) / 24
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hours := int(d.Hours()) % 24
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minutes := int(d.Minutes()) % 60
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switch {
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case days > 0:
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return fmt.Sprintf("%dd %dh", days, hours)
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case hours > 0:
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return fmt.Sprintf("%dh %dm", hours, minutes)
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default:
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return fmt.Sprintf("%dm", minutes)
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}
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}
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// assetHashPattern matches a cache-busted asset request such as
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// "app.a1b2c3d4e5.css" and captures the base name, hash and extension.
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var assetHashPattern = regexp.MustCompile(`^([a-zA-Z0-9_-]+)\.([0-9a-f]{10})\.(css|js)$`)
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// asset serves /assets/{file}. A request matching the hashed pattern is
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// served with a one-year immutable cache, but only if the hash still
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// matches the currently embedded file (so a stale/forged hash 404s instead
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// of being cached). Any other request (e.g. a bare "app.css" during local
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// debugging) falls back to the embedded file with no special caching.
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func (s *Server) asset(w http.ResponseWriter, r *http.Request) {
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file := r.PathValue("file")
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name := file
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cacheable := false
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if m := assetHashPattern.FindStringSubmatch(file); m != nil {
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base, hash, ext := m[1], m[2], m[3]
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candidate := base + "." + ext
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if assetHashes[candidate] == hash {
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name = candidate
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cacheable = true
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} else {
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http.NotFound(w, r)
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return
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}
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}
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data, err := embedded.ReadFile("assets/" + name)
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if err != nil {
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http.NotFound(w, r)
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return
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}
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switch filepath.Ext(name) {
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case ".css":
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w.Header().Set("Content-Type", "text/css; charset=utf-8")
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case ".js":
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w.Header().Set("Content-Type", "text/javascript; charset=utf-8")
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}
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if cacheable {
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w.Header().Set("Cache-Control", "public, max-age=31536000, immutable")
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} else {
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w.Header().Set("Cache-Control", "no-cache")
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}
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_, _ = w.Write(data)
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}
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func (s *Server) graph(w http.ResponseWriter, r *http.Request) {
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ip := s.clientIP(r).String()
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if !s.limit.allow("graph|"+ip, 120, time.Minute) {
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s.tooMany(w)
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return
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}
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ctx, cancel := context.WithTimeout(r.Context(), 8*time.Second)
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defer cancel()
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file := r.PathValue("file")
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if !strings.HasSuffix(file, ".png") {
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http.NotFound(w, r)
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return
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}
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key := strings.TrimSuffix(file, ".png")
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theme := "dark"
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if strings.HasSuffix(key, "-light") {
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theme = "light"
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key = strings.TrimSuffix(key, "-light")
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}
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if key == "" || strings.Contains(key, "/") {
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http.NotFound(w, r)
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return
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}
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p, err := s.rrd.Graph(ctx, key, theme)
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if err != nil {
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http.Error(w, "graph unavailable", http.StatusServiceUnavailable)
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return
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}
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w.Header().Set("Cache-Control", "public, max-age=60")
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http.ServeFile(w, r, p)
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}
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func (s *Server) channel(w http.ResponseWriter, r *http.Request) {
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ip := s.clientIP(r)
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if ip == nil {
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http.Error(w, "invalid client address", http.StatusBadRequest)
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return
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}
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if !s.limit.allow("channel|"+ip.String(), 40, time.Minute) {
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s.tooMany(w)
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return
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}
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ctx, cancel := context.WithTimeout(r.Context(), s.cfg.TSQueryTimeout)
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defer cancel()
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clients, err := s.ts.ClientsByIP(ctx, ip)
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p := channelPage{ClientIP: ip.String(), Clients: clients, FormToken: s.tokens.formToken(ip.String()), VoiceURL: s.voiceURL()}
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if err != nil {
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p.Error = "Nie udało się sprawdzić połączenia z TeamSpeak."
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}
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if len(clients) == 1 {
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p.Client = &clients[0]
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p.ClientToken = s.tokens.clientToken(ip.String(), clients[0])
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}
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w.Header().Set("Cache-Control", "no-store")
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s.render(w, "channel.html", p)
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}
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func (s *Server) verifyStart(w http.ResponseWriter, r *http.Request) {
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ip := s.clientIP(r)
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if ip == nil {
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http.Error(w, "bad request", 400)
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return
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}
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if !s.requirePost(w, r, ip.String()) {
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return
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}
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if !s.limit.allow("verify|"+ip.String(), 10, time.Minute) {
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s.tooMany(w)
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return
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}
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if _, err := s.tokens.verify(r.FormValue("form_token"), "form", ip.String()); err != nil {
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log.Printf("403 invalid form token: ip=%s path=%s err=%v", ip, r.URL.Path, err)
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http.Error(w, "invalid form", http.StatusForbidden)
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return
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}
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clid, _ := strconv.Atoi(r.FormValue("clid"))
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ctx, cancel := context.WithTimeout(r.Context(), s.cfg.TSQueryTimeout)
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defer cancel()
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clients, err := s.ts.ClientsByIP(ctx, ip)
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if err != nil {
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http.Error(w, "verification unavailable", 503)
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return
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}
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var selected *ts3.Client
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for i := range clients {
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if clients[i].ID == clid {
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selected = &clients[i]
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break
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}
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}
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if selected == nil {
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http.Error(w, "client unavailable", 409)
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return
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}
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challenge, code, _ := s.tokens.challengeToken(ip.String(), *selected)
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if err := s.ts.SendPrivateMessage(ctx, selected.ID, "Kod weryfikacyjny strony tworzenia kanału: "+code+". Kod jest ważny 5 minut."); err != nil {
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http.Error(w, "could not send verification", 503)
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return
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}
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p := channelPage{ClientIP: ip.String(), Client: selected, ChallengeToken: challenge, FormToken: s.tokens.formToken(ip.String()), VoiceURL: s.voiceURL()}
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s.render(w, "verify.html", p)
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}
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func (s *Server) verifyComplete(w http.ResponseWriter, r *http.Request) {
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ip := s.clientIP(r)
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if ip == nil {
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http.Error(w, "bad request", 400)
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return
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}
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if !s.requirePost(w, r, ip.String()) {
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return
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}
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if !s.limit.allow("verifydone|"+ip.String(), 10, time.Minute) {
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s.tooMany(w)
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return
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}
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if _, err := s.tokens.verify(r.FormValue("form_token"), "form", ip.String()); err != nil {
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log.Printf("403 invalid form token: ip=%s path=%s err=%v", ip, r.URL.Path, err)
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http.Error(w, "invalid form", 403)
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return
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}
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pld, err := s.tokens.verify(r.FormValue("challenge_token"), "challenge", ip.String())
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if err != nil || r.FormValue("code") != s.tokens.challengeCode(pld) {
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log.Printf("403 invalid or expired code: ip=%s path=%s token_err=%v", ip, r.URL.Path, err)
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http.Error(w, "invalid or expired code", 403)
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return
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}
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c := ts3.Client{ID: pld.ClID, DatabaseID: pld.DBID, Nick: pld.Nick, UID: pld.UID, IP: ip.String()}
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p := channelPage{ClientIP: ip.String(), Client: &c, ClientToken: s.tokens.clientToken(ip.String(), c), FormToken: s.tokens.formToken(ip.String()), VoiceURL: s.voiceURL()}
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s.render(w, "channel.html", p)
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}
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func (s *Server) createChannel(w http.ResponseWriter, r *http.Request) {
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ip := s.clientIP(r)
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if ip == nil {
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http.Error(w, "bad request", 400)
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return
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}
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if !s.requirePost(w, r, ip.String()) {
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return
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}
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if !s.limit.allow("create|"+ip.String(), 5, time.Hour) {
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s.tooMany(w)
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return
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}
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if _, err := s.tokens.verify(r.FormValue("form_token"), "form", ip.String()); err != nil {
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log.Printf("403 invalid form token: ip=%s path=%s err=%v", ip, r.URL.Path, err)
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http.Error(w, "invalid form", 403)
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return
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}
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pld, err := s.tokens.verify(r.FormValue("client_token"), "client", ip.String())
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if err != nil {
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log.Printf("403 client verification expired: ip=%s path=%s err=%v", ip, r.URL.Path, err)
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http.Error(w, "client verification expired", 403)
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return
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}
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name := strings.TrimSpace(r.FormValue("name"))
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topic := strings.TrimSpace(r.FormValue("topic"))
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password := r.FormValue("password")
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maxClientsRaw := strings.TrimSpace(r.FormValue("maxclients"))
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codecQualityRaw := strings.TrimSpace(r.FormValue("codec_quality"))
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if name == "" {
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name = randomChannelName()
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}
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maxClients, codecQuality, err := parseChannelOptions(maxClientsRaw, codecQualityRaw)
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if err == nil {
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err = validateInput(name, topic, password)
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}
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if err != nil {
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c := ts3.Client{ID: pld.ClID, DatabaseID: pld.DBID, Nick: pld.Nick, UID: pld.UID, IP: ip.String()}
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s.render(w, "channel.html", channelPage{ClientIP: ip.String(), Client: &c, ClientToken: r.FormValue("client_token"), FormToken: s.tokens.formToken(ip.String()), Error: err.Error(), VoiceURL: s.voiceURL(), Name: name, Topic: topic, MaxClients: maxClientsRaw, CodecQuality: codecQualityRaw})
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return
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}
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c := ts3.Client{ID: pld.ClID, DatabaseID: pld.DBID, Nick: pld.Nick, UID: pld.UID, IP: ip.String()}
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ctx, cancel := context.WithTimeout(r.Context(), 6*time.Second)
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defer cancel()
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cid, err := s.ts.CreateChannelForClient(ctx, c, s.cfg.TSChannelAdminGID, name, topic, password, maxClients, codecQuality)
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if err != nil {
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log.Printf("channel create failed for client dbid=%d: %v", c.DatabaseID, err)
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s.render(w, "channel.html", channelPage{ClientIP: ip.String(), Client: &c, ClientToken: s.tokens.clientToken(ip.String(), c), FormToken: s.tokens.formToken(ip.String()), Error: "Nie udało się utworzyć kanału. Sprawdź połączenie z TS3 i spróbuj ponownie.", VoiceURL: s.voiceURL(), Name: name, Topic: topic, MaxClients: maxClientsRaw, CodecQuality: codecQualityRaw})
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return
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}
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s.render(w, "channel.html", channelPage{ClientIP: ip.String(), Client: &c, FormToken: s.tokens.formToken(ip.String()), Success: "Kanał został utworzony, uprawnienia nadane, a klient przeniesiony.", ChannelID: cid, VoiceURL: s.voiceURL()})
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}
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func parseChannelOptions(maxClientsRaw, codecQualityRaw string) (maxClients, codecQuality int, err error) {
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if maxClientsRaw != "" {
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maxClients, err = strconv.Atoi(maxClientsRaw)
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if err != nil || maxClients < 0 || maxClients > 512 {
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return 0, 0, fmt.Errorf("Limit użytkowników musi być liczbą 0–512 (0 = bez limitu).")
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}
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}
|
||
if codecQualityRaw != "" {
|
||
codecQuality, err = strconv.Atoi(codecQualityRaw)
|
||
if err != nil || codecQuality < 1 || codecQuality > 10 {
|
||
return 0, 0, fmt.Errorf("Jakość kodeka musi być liczbą 1–10.")
|
||
}
|
||
}
|
||
return maxClients, codecQuality, nil
|
||
}
|
||
|
||
// requestHost returns the hostname the client actually used to reach us.
|
||
// Behind a reverse proxy, r.Host is the proxy's own upstream address (e.g.
|
||
// 127.0.0.1:8080) unless the proxy explicitly forwards the original Host --
|
||
// so when the request comes from a configured TRUSTED_PROXIES peer, prefer
|
||
// X-Forwarded-Host if the proxy sent one, falling back to r.Host otherwise.
|
||
func (s *Server) requestHost(r *http.Request) string {
|
||
host, _, err := net.SplitHostPort(r.RemoteAddr)
|
||
if err != nil {
|
||
host = r.RemoteAddr
|
||
}
|
||
if remote := net.ParseIP(strings.TrimSpace(host)); remote != nil {
|
||
for _, n := range s.cfg.TrustedProxies {
|
||
if n.Contains(remote) {
|
||
if v := strings.TrimSpace(r.Header.Get("X-Forwarded-Host")); v != "" {
|
||
return v
|
||
}
|
||
break
|
||
}
|
||
}
|
||
}
|
||
return r.Host
|
||
}
|
||
|
||
func (s *Server) requirePost(w http.ResponseWriter, r *http.Request, ip string) bool {
|
||
r.Body = http.MaxBytesReader(w, r.Body, 16<<10)
|
||
if err := r.ParseForm(); err != nil {
|
||
http.Error(w, "bad request", 400)
|
||
return false
|
||
}
|
||
// Browsers legitimately send "Origin: null" for requests originating
|
||
// from a sandboxed iframe without allow-same-origin (our documented
|
||
// embed widget, /embed/channel) and in a few redirect/privacy-mode
|
||
// edge cases -- it is not attacker-controlled, so treat it the same as
|
||
// no Origin header at all. The actual CSRF defense here is the signed,
|
||
// time-limited, IP-bound form/client/challenge token, not this header;
|
||
// this check is only a defense-in-depth cross-check for the common
|
||
// case where a real Origin is present.
|
||
if o := r.Header.Get("Origin"); o != "" && o != "null" {
|
||
u, err := url.Parse(o)
|
||
host := s.requestHost(r)
|
||
if err != nil || !strings.EqualFold(u.Host, host) {
|
||
log.Printf("403 origin mismatch: ip=%s path=%s origin=%q expected_host=%q r.Host=%q x-forwarded-host=%q", ip, r.URL.Path, o, host, r.Host, r.Header.Get("X-Forwarded-Host"))
|
||
http.Error(w, "forbidden", 403)
|
||
return false
|
||
}
|
||
}
|
||
return true
|
||
}
|
||
|
||
func validateInput(name, topic, password string) error {
|
||
if utf8.RuneCountInString(name) < 1 || utf8.RuneCountInString(name) > 40 {
|
||
return fmt.Errorf("Nazwa kanału musi mieć 1–40 znaków.")
|
||
}
|
||
if utf8.RuneCountInString(topic) > 255 {
|
||
return fmt.Errorf("Temat może mieć maksymalnie 255 znaków.")
|
||
}
|
||
if utf8.RuneCountInString(password) > 64 {
|
||
return fmt.Errorf("Hasło może mieć maksymalnie 64 znaki.")
|
||
}
|
||
for _, v := range []string{name, topic, password} {
|
||
if strings.ContainsRune(v, '\x00') {
|
||
return fmt.Errorf("Nieprawidłowe dane wejściowe.")
|
||
}
|
||
}
|
||
return nil
|
||
}
|
||
|
||
func randomChannelName() string { return "channel-" + randomNonce()[:10] }
|
||
|
||
func (s *Server) clientIP(r *http.Request) net.IP {
|
||
host, _, err := net.SplitHostPort(r.RemoteAddr)
|
||
if err != nil {
|
||
host = r.RemoteAddr
|
||
}
|
||
remote := net.ParseIP(strings.TrimSpace(host))
|
||
if remote == nil {
|
||
return nil
|
||
}
|
||
trusted := false
|
||
for _, n := range s.cfg.TrustedProxies {
|
||
if n.Contains(remote) {
|
||
trusted = true
|
||
break
|
||
}
|
||
}
|
||
if !trusted {
|
||
return remote
|
||
}
|
||
for _, h := range []string{"CF-Connecting-IP", "X-Real-IP"} {
|
||
if v := strings.TrimSpace(r.Header.Get(h)); v != "" {
|
||
if ip := net.ParseIP(v); ip != nil {
|
||
return ip
|
||
}
|
||
}
|
||
}
|
||
if v := r.Header.Get("X-Forwarded-For"); v != "" {
|
||
if ip := net.ParseIP(strings.TrimSpace(strings.Split(v, ",")[0])); ip != nil {
|
||
return ip
|
||
}
|
||
}
|
||
return remote
|
||
}
|
||
|
||
// voiceURL builds the ts3:// deep link used to launch the TeamSpeak client.
|
||
// Returned as template.URL (not a plain string) because html/template's
|
||
// default URL sanitizer only allow-lists http/https/mailto and otherwise
|
||
// silently rewrites the href to "#ZgotmplZ" -- template.URL marks this
|
||
// server-built value as safe to emit verbatim.
|
||
func (s *Server) voiceURL() template.URL {
|
||
return template.URL("ts3://" + s.cfg.TSVoiceHost + "?port=" + strconv.Itoa(s.cfg.TSVoicePort))
|
||
}
|
||
func (s *Server) tooMany(w http.ResponseWriter) {
|
||
w.Header().Set("Retry-After", "60")
|
||
http.Error(w, "too many requests", http.StatusTooManyRequests)
|
||
}
|
||
func (s *Server) render(w http.ResponseWriter, name string, data any) {
|
||
w.Header().Set("Content-Type", "text/html; charset=utf-8")
|
||
if err := s.tpl.ExecuteTemplate(w, name, data); err != nil {
|
||
log.Printf("template error: %v", err)
|
||
}
|
||
}
|
||
|
||
func EnsureGraphDir(path string) error { return os.MkdirAll(filepath.Clean(path), 0750) }
|