103 lines
2.4 KiB
Go
103 lines
2.4 KiB
Go
package main
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import (
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"bytes"
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"crypto"
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"crypto/ecdsa"
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"crypto/elliptic"
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"crypto/rand"
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"crypto/x509"
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"crypto/x509/pkix"
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"encoding/pem"
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"fmt"
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"io/ioutil"
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"math/big"
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"os"
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"path/filepath"
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"time"
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)
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func main() {
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if len(os.Args) < 3 {
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fmt.Fprintln(os.Stderr, "usage: gencerts SERVERDIR AGENTDIR [AGENTDIR...]")
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os.Exit(1)
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}
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notAfter := time.Now().Add(time.Hour * 2)
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caKey := generateKey()
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caCert := createRootCertificate(caKey, &x509.Certificate{
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SerialNumber: big.NewInt(1),
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BasicConstraintsValid: true,
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IsCA: true,
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NotAfter: notAfter,
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Subject: pkix.Name{CommonName: "Agent CA"},
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})
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writeCerts(filepath.Join(os.Args[1], "agent-cacert.pem"), caCert)
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for i, dir := range os.Args[2:] {
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agentKey := generateKey()
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agentCert := createCertificate(agentKey, &x509.Certificate{
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SerialNumber: big.NewInt(int64(i)),
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KeyUsage: x509.KeyUsageDigitalSignature,
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NotAfter: notAfter,
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Subject: pkix.Name{CommonName: filepath.Base(dir)},
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}, caKey, caCert)
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writeKey(filepath.Join(dir, "agent.key.pem"), agentKey)
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writeCerts(filepath.Join(dir, "agent.crt.pem"), agentCert)
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}
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}
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func createRootCertificate(key crypto.Signer, tmpl *x509.Certificate) *x509.Certificate {
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return createCertificate(key, tmpl, key, tmpl)
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}
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func createCertificate(key crypto.Signer, tmpl *x509.Certificate, parentKey crypto.Signer, parent *x509.Certificate) *x509.Certificate {
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certDER, err := x509.CreateCertificate(rand.Reader, tmpl, parent, key.Public(), parentKey)
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checkErr(err)
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cert, err := x509.ParseCertificate(certDER)
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checkErr(err)
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return cert
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}
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func generateKey() crypto.Signer {
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key, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
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checkErr(err)
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return key
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}
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func writeKey(path string, key crypto.Signer) {
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keyBytes, err := x509.MarshalPKCS8PrivateKey(key)
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checkErr(err)
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pemBytes := pem.EncodeToMemory(&pem.Block{
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Type: "PRIVATE KEY",
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Bytes: keyBytes,
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})
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writeFile(path, pemBytes, 0600)
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}
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func writeCerts(path string, certs ...*x509.Certificate) {
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data := new(bytes.Buffer)
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for _, cert := range certs {
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err := pem.Encode(data, &pem.Block{
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Type: "CERTIFICATE",
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Bytes: cert.Raw,
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})
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checkErr(err)
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}
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writeFile(path, data.Bytes(), 0644)
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}
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func writeFile(path string, data []byte, mode os.FileMode) {
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err := ioutil.WriteFile(path, data, mode)
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checkErr(err)
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}
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func checkErr(err error) {
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if err != nil {
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panic(err)
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}
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}
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