Proof of Concept to generate certificate signing requests in a web browser using node-forge.
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package main
import (
"crypto/rand"
"crypto/tls"
"crypto/x509"
"encoding/base64"
"encoding/pem"
"fmt"
"io/ioutil"
"net/http"
"os"
"os/signal"
"strings"
"syscall"
"time"
"github.com/BurntSushi/toml"
"github.com/gorilla/csrf"
"github.com/nicksnyder/go-i18n/v2/i18n"
log "github.com/sirupsen/logrus"
"golang.org/x/text/language"
"git.dittberner.info/jan/browser_csr_generation/handlers"
)
func main() {
log.SetFormatter(&log.TextFormatter{
FullTimestamp: true,
})
bundle := loadI18nBundle()
mux := http.NewServeMux()
csrfKey := initCSRFKey()
signingRequestRegistry := handlers.NewSigningRequestRegistry(loadCACertificates())
mux.Handle("/sign/", handlers.NewCertificateSigningHandler(signingRequestRegistry))
mux.Handle("/", handlers.NewIndexHandler(bundle))
fileServer := http.FileServer(http.Dir("./public"))
mux.Handle("/css/", fileServer)
mux.Handle("/js/", fileServer)
mux.Handle("/locales/", handlers.NewJSLocalesHandler(bundle))
mux.Handle("/ws/", handlers.NewWebSocketHandler(signingRequestRegistry))
tlsConfig := &tls.Config{
CipherSuites: []uint16{
tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
tls.TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256,
},
NextProtos: []string{"h2"},
PreferServerCipherSuites: true,
MinVersion: tls.VersionTLS12,
}
server := http.Server{
Addr: ":8000",
Handler: csrf.Protect(csrfKey, csrf.FieldName("csrfToken"), csrf.RequestHeader("X-CSRF-Token"))(mux),
TLSConfig: tlsConfig,
ReadTimeout: 20 * time.Second,
ReadHeaderTimeout: 5 * time.Second,
WriteTimeout: 30 * time.Second,
IdleTimeout: 30 * time.Second,
}
go func() {
err := server.ListenAndServeTLS("server.crt.pem", "server.key.pem")
if err != nil {
log.Fatal(err)
}
}()
var hostPort string
if strings.HasPrefix(server.Addr, ":") {
hostPort = fmt.Sprintf("localhost%s", server.Addr)
} else {
hostPort = server.Addr
}
log.Infof("started web server on https://%s/", hostPort)
c := make(chan os.Signal, 1)
signal.Notify(c, os.Interrupt, syscall.SIGTERM)
s := <-c
log.Infof("received %s, shutting down", s)
_ = server.Close()
}
func loadI18nBundle() *i18n.Bundle {
bundle := i18n.NewBundle(language.English)
bundle.RegisterUnmarshalFunc("toml", toml.Unmarshal)
for _, lang := range []string{"en-US", "de-DE"} {
if _, err := bundle.LoadMessageFile(fmt.Sprintf("active.%s.toml", lang)); err != nil {
log.Panic(err)
}
}
return bundle
}
func initCSRFKey() []byte {
var csrfKey []byte = nil
if csrfB64, exists := os.LookupEnv("CSRF_KEY"); exists {
csrfKey, _ = base64.RawStdEncoding.DecodeString(csrfB64)
log.Info("read CSRF key from environment variable")
}
if csrfKey == nil {
csrfKey = generateRandomBytes(32)
log.Infof(
"generated new random CSRF key, set environment variable CSRF_KEY to %s to "+
"keep the same key for new sessions",
base64.RawStdEncoding.EncodeToString(csrfKey))
}
return csrfKey
}
func generateRandomBytes(count int) []byte {
randomBytes := make([]byte, count)
_, err := rand.Read(randomBytes)
if err != nil {
log.Fatalf("could not read random bytes: %v", err)
return nil
}
return randomBytes
}
func loadCACertificates() (caCertificates []*x509.Certificate) {
var err error
caCertificates = make([]*x509.Certificate, 2)
for index, certFile := range []string{"example_ca/sub/ca.crt.pem", "example_ca/root/ca.crt.pem"} {
var certBytes []byte
if certBytes, err = ioutil.ReadFile(certFile); err != nil {
log.Panic(err)
}
var block *pem.Block
if block, _ = pem.Decode(certBytes); block == nil {
log.Panicf("no PEM data found in %s", certFile)
return
}
if caCertificates[index], err = x509.ParseCertificate(block.Bytes); err != nil {
log.Panic(err)
}
}
log.Infof("read %d CA certificates", len(caCertificates))
return
}