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package main
import (
"crypto/tls"
"flag"
"fmt"
"log"
"log/slog"
"net"
"net/http"
"net/http/httputil"
"net/url"
"os"
"os/signal"
"path/filepath"
"sync"
"syscall"
"time"
"within.website/x/internal"
)
var (
bind = flag.String("bind", ":3004", "port to listen on")
certDir = flag.String("cert-dir", "/xe/pki", "where to read mounted certificates from")
certFname = flag.String("cert-fname", "tls.crt", "certificate filename")
keyFname = flag.String("key-fname", "tls.key", "key filename")
proxyTo = flag.String("proxy-to", "http://localhost:5000", "where to reverse proxy to")
)
func main() {
internal.HandleStartup()
slog.Info("starting",
"bind", *bind,
"cert-dir", *certDir,
"cert-fname", *certFname,
"key-fname", *keyFname,
"proxy-to", *proxyTo,
)
cert := filepath.Join(*certDir, *certFname)
key := filepath.Join(*certDir, *keyFname)
st, err := os.Stat(cert)
if err != nil {
slog.Error("can't stat cert file", "certFname", cert)
os.Exit(1)
}
lastModified := st.ModTime()
go func(lm time.Time) {
t := time.NewTicker(time.Hour)
defer t.Stop()
for range t.C {
st, err := os.Stat(cert)
if err != nil {
slog.Error("can't stat file", "fname", cert, "err", err)
continue
}
if st.ModTime().After(lm) {
slog.Info("new cert detected", "oldTime", lm.Format(time.RFC3339), "newTime", st.ModTime().Format(time.RFC3339))
os.Exit(0)
}
}
}(lastModified)
u, err := url.Parse(*proxyTo)
if err != nil {
log.Fatal(err)
}
kpr, err := NewKeypairReloader(cert, key)
if err != nil {
log.Fatal(err)
}
h := httputil.NewSingleHostReverseProxy(u)
oldDirector := h.Director
h.Director = func(req *http.Request) {
oldDirector(req)
host, _, _ := net.SplitHostPort(req.RemoteAddr)
if host != "" {
req.Header.Set("X-Real-Ip", host)
}
fp := GetTLSFingerprint(req)
if fp != nil {
req.Header.Set("X-JA3N-Fingerprint", fp.JA3N().String())
req.Header.Set("X-JA4-Fingerprint", fp.JA4().String())
}
}
srv := &http.Server{
Addr: *bind,
Handler: h,
TLSConfig: &tls.Config{
GetCertificate: kpr.GetCertificate,
},
}
applyTLSFingerprinter(srv)
log.Fatal(srv.ListenAndServeTLS("", ""))
}
type keypairReloader struct {
certMu sync.RWMutex
cert *tls.Certificate
certPath string
keyPath string
modTime time.Time
}
func NewKeypairReloader(certPath, keyPath string) (*keypairReloader, error) {
result := &keypairReloader{
certPath: certPath,
keyPath: keyPath,
}
cert, err := tls.LoadX509KeyPair(certPath, keyPath)
if err != nil {
return nil, err
}
result.cert = &cert
st, err := os.Stat(certPath)
if err != nil {
return nil, err
}
result.modTime = st.ModTime()
go func() {
c := make(chan os.Signal, 1)
signal.Notify(c, syscall.SIGHUP)
for range c {
slog.Info("got SIGHUP")
if err := result.maybeReload(); err != nil {
slog.Error("can't load tls cert", "err", err)
}
}
}()
return result, nil
}
func (kpr *keypairReloader) maybeReload() error {
slog.Info("loading new keypair", "cert", kpr.certPath, "key", kpr.keyPath)
newCert, err := tls.LoadX509KeyPair(kpr.certPath, kpr.keyPath)
if err != nil {
return err
}
st, err := os.Stat(kpr.certPath)
if err != nil {
return err
}
kpr.certMu.Lock()
defer kpr.certMu.Unlock()
kpr.cert = &newCert
kpr.modTime = st.ModTime()
return nil
}
func (kpr *keypairReloader) GetCertificate(*tls.ClientHelloInfo) (*tls.Certificate, error) {
kpr.certMu.RLock()
defer kpr.certMu.RUnlock()
st, err := os.Stat(kpr.certPath)
if err != nil {
return nil, fmt.Errorf("internal error: stat(%q): %q", kpr.certPath, err)
}
if st.ModTime().After(kpr.modTime) {
kpr.certMu.RUnlock()
if err := kpr.maybeReload(); err != nil {
return nil, fmt.Errorf("can't reload cert: %w", err)
}
kpr.certMu.RLock()
}
return kpr.cert, nil
}
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