107 lines
2.3 KiB
Go
107 lines
2.3 KiB
Go
package main
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import (
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"crypto/rand"
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"crypto/tls"
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"crypto/x509"
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"encoding/hex"
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"encoding/pem"
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"flag"
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"fmt"
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"io/ioutil"
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"net"
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"os"
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"git.wntrmute.dev/kyle/goutils/die"
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)
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func main() {
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cfg := &tls.Config{}
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var sysRoot, listenAddr, certFile, keyFile string
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var verify bool
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flag.StringVar(&sysRoot, "ca", "", "provide an alternate CA bundle")
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flag.StringVar(&listenAddr, "listen", ":443", "address to listen on")
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flag.StringVar(&certFile, "cert", "", "server certificate to present to clients")
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flag.StringVar(&keyFile, "key", "", "key for server certificate")
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flag.BoolVar(&verify, "verify", false, "verify client certificates")
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flag.Parse()
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if verify {
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cfg.ClientAuth = tls.RequireAndVerifyClientCert
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} else {
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cfg.ClientAuth = tls.RequestClientCert
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}
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if certFile == "" {
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fmt.Println("[!] missing required flag -cert")
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os.Exit(1)
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}
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if keyFile == "" {
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fmt.Println("[!] missing required flag -key")
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os.Exit(1)
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}
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cert, err := tls.LoadX509KeyPair(certFile, keyFile)
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if err != nil {
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fmt.Printf("[!] could not load server key pair: %v", err)
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os.Exit(1)
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}
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cfg.Certificates = append(cfg.Certificates, cert)
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if sysRoot != "" {
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pemList, err := ioutil.ReadFile(sysRoot)
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die.If(err)
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roots := x509.NewCertPool()
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if !roots.AppendCertsFromPEM(pemList) {
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fmt.Printf("[!] no valid roots found")
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roots = nil
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}
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cfg.RootCAs = roots
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}
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l, err := net.Listen("tcp", listenAddr)
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if err != nil {
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fmt.Println(err.Error())
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os.Exit(1)
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}
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for {
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conn, err := l.Accept()
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if err != nil {
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fmt.Println(err.Error())
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}
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raddr := conn.RemoteAddr()
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tconn := tls.Server(conn, cfg)
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err = tconn.Handshake()
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if err != nil {
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fmt.Printf("[+] %v: failed to complete handshake: %v\n", raddr, err)
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continue
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}
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cs := tconn.ConnectionState()
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if len(cs.PeerCertificates) == 0 {
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fmt.Printf("[+] %v: no chain presented\n", raddr)
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continue
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}
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var chain []byte
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for _, cert := range cs.PeerCertificates {
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p := &pem.Block{
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Type: "CERTIFICATE",
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Bytes: cert.Raw,
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}
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chain = append(chain, pem.EncodeToMemory(p)...)
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}
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var nonce [16]byte
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_, err = rand.Read(nonce[:])
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if err != nil {
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panic(err)
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}
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fname := fmt.Sprintf("%v-%v.pem", raddr, hex.EncodeToString(nonce[:]))
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err = ioutil.WriteFile(fname, chain, 0644)
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die.If(err)
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fmt.Printf("%v: [+] wrote %v.\n", raddr, fname)
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}
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}
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