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zts-svccert.go
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zts-svccert.go
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package main
import (
"bytes"
"crypto"
"crypto/rand"
"crypto/tls"
"crypto/x509"
"crypto/x509/pkix"
"encoding/pem"
"errors"
"flag"
"fmt"
"io/ioutil"
"log"
"net"
"net/http"
"net/url"
"strings"
"time"
"github.com/AthenZ/athenz/clients/go/zts"
"github.com/AthenZ/athenz/libs/go/zmssvctoken"
)
type signer struct {
key crypto.Signer
algorithm x509.SignatureAlgorithm
}
var (
// VERSION gets set by the build script via the LDFLAGS.
VERSION string
// BUILD_DATE gets set by the build script via the LDFLAGS.
BUILD_DATE string
)
func printVersion() {
if VERSION == "" {
fmt.Println("zts-svccert (development version)")
} else {
fmt.Println("zts-svccert " + VERSION + " " + BUILD_DATE)
}
}
func main() {
var ztsURL, serviceKey, serviceCert, domain, service, keyID string
var caCertFile, certFile, signerCertFile, dnsDomain, hdr, ip string
var subjC, subjO, subjOU, uri, provider, instance, instanceId string
var attestationDataFile string
var csr, spiffe, showVersion bool
var expiryTime int
flag.BoolVar(&csr, "csr", false, "request csr only")
flag.BoolVar(&spiffe, "spiffe", true, "include spiffe uri in csr")
flag.IntVar(&expiryTime, "expiry-time", 0, "expiry time in minutes")
flag.StringVar(&certFile, "cert-file", "", "output certificate file")
flag.StringVar(&signerCertFile, "signer-cert-file", "", "output signer certificate file")
flag.StringVar(&caCertFile, "cacert", "", "CA certificate file")
flag.StringVar(&serviceKey, "private-key", "", "private key file (required)")
flag.StringVar(&serviceCert, "service-cert", "", "service certificate file")
flag.StringVar(&domain, "domain", "", "domain of service (required)")
flag.StringVar(&service, "service", "", "name of service (required)")
flag.StringVar(&keyID, "key-version", "", "key version")
flag.StringVar(&ztsURL, "zts", "", "url of the ZTS Service")
flag.StringVar(&dnsDomain, "dns-domain", "", "dns domain suffix to be included in the csr (required)")
flag.StringVar(&hdr, "hdr", "Athenz-Principal-Auth", "Header name")
flag.StringVar(&subjC, "subj-c", "US", "Subject C/Country field")
flag.StringVar(&subjO, "subj-o", "Oath Inc.", "Subject O/Organization field")
flag.StringVar(&subjOU, "subj-ou", "Athenz", "Subject OU/OrganizationalUnit field")
flag.StringVar(&ip, "ip", "", "IP address")
flag.StringVar(&provider, "provider", "", "Athenz Provider")
flag.StringVar(&instance, "instance", "", "Instance Id")
flag.StringVar(&attestationDataFile, "attestation-data", "", "Attestation Data File")
flag.BoolVar(&showVersion, "version", false, "Show version")
flag.Parse()
if showVersion {
printVersion()
return
}
if serviceKey == "" || domain == "" || service == "" || dnsDomain == "" {
log.Fatalln("Error: missing required attributes. Run with -help for command line arguments")
}
// load private key
keyBytes, err := ioutil.ReadFile(serviceKey)
if err != nil {
log.Fatalln(err)
}
// get our private key signer for csr
pkSigner, err := newSigner(keyBytes)
if err != nil {
log.Fatalln(err)
}
// generate a csr for this service
// note: RFC 6125 states that if the SAN (Subject Alternative Name) exists,
// it is used, not the CA. So, we will always put the Athenz name in the CN
// (it is *not* a DNS domain name), and put the host name into the SAN.
hyphenDomain := strings.Replace(domain, ".", "-", -1)
host := fmt.Sprintf("%s.%s.%s", service, hyphenDomain, dnsDomain)
commonName := fmt.Sprintf("%s.%s", domain, service)
if instance != "" {
uriProvider := "zts"
if provider != "" {
uriProvider = provider
}
instanceId = fmt.Sprintf("athenz://instanceid/%s/%s", uriProvider, instance)
}
if spiffe {
uri = fmt.Sprintf("spiffe://%s/sa/%s", domain, service)
}
subj := pkix.Name{
CommonName: commonName,
OrganizationalUnit: []string{subjOU},
Organization: []string{subjO},
Country: []string{subjC},
}
csrData, err := generateCSR(pkSigner, subj, host, instanceId, ip, uri)
if err != nil {
log.Fatalln(err)
}
// if we're provided the csr flag then we're going to display
// it and return right away
if csr {
fmt.Println(csrData)
return
}
// for all other operations we need to have ZTS Server url
if ztsURL == "" {
log.Fatalln("Error: missing ZTS Server url. Run with -help for command line arguments")
}
// if we're given a certificate then we'll use that otherwise
// we're going to generate a ntoken for our request unless
// we're using copper argos which only uses tls and the attestation
// data contains the authentication details
var client *zts.ZTSClient
if provider != "" {
client, err = certClient(ztsURL, nil, "", caCertFile)
} else if serviceCert == "" {
client, err = ntokenClient(ztsURL, domain, service, keyID, caCertFile, hdr, keyBytes)
} else {
client, err = certClient(ztsURL, keyBytes, serviceCert, caCertFile)
}
if err != nil {
log.Fatalln(err)
}
var certificate, caCertificates string
// if we're given provider then we're going to use our
// copper argos model to request the certificate
if provider != "" {
if instanceId == "" {
log.Fatalln("Error: Please specify instance value. Run with -help for command line arguments")
}
attestationData := ""
if attestationDataFile != "" {
attestationDataBytes, err := ioutil.ReadFile(attestationDataFile)
if err != nil {
log.Fatalln(err)
}
attestationData = string(attestationDataBytes)
} else {
attestationData, err = getNToken(domain, service, keyID, keyBytes)
if err != nil {
log.Fatalln(err)
}
}
req := &zts.InstanceRegisterInformation{
Provider: zts.ServiceName(provider),
Domain: zts.DomainName(domain),
Service: zts.SimpleName(service),
AttestationData: attestationData,
Csr: csrData,
}
// request a tls certificate for this service
identity, _, err := client.PostInstanceRegisterInformation(req)
if err != nil {
log.Fatalln(err)
}
certificate = identity.X509Certificate
caCertificates = identity.X509CertificateSigner
} else {
expiryTime32 := int32(expiryTime)
req := &zts.InstanceRefreshRequest{
Csr: csrData,
KeyId: keyID,
ExpiryTime: &expiryTime32,
}
// request a tls certificate for this service
identity, err := client.PostInstanceRefreshRequest(zts.CompoundName(domain), zts.SimpleName(service), req)
if err != nil {
log.Fatalln(err)
}
certificate = identity.Certificate
caCertificates = identity.CaCertBundle
}
if certFile != "" {
err = ioutil.WriteFile(certFile, []byte(certificate), 0444)
if err != nil {
log.Fatalln(err)
}
} else {
fmt.Println(certificate)
}
if signerCertFile != "" {
err = ioutil.WriteFile(signerCertFile, []byte(caCertificates), 0444)
if err != nil {
log.Fatalln(err)
}
}
}
func newSigner(privateKeyPEM []byte) (*signer, error) {
block, _ := pem.Decode(privateKeyPEM)
if block == nil {
return nil, fmt.Errorf("Unable to load private key")
}
switch block.Type {
case "EC PRIVATE KEY":
key, err := x509.ParseECPrivateKey(block.Bytes)
if err != nil {
return nil, err
}
return &signer{key: key, algorithm: x509.ECDSAWithSHA256}, nil
case "RSA PRIVATE KEY":
key, err := x509.ParsePKCS1PrivateKey(block.Bytes)
if err != nil {
return nil, err
}
return &signer{key: key, algorithm: x509.SHA256WithRSA}, nil
default:
return nil, fmt.Errorf("Unsupported private key type: %s", block.Type)
}
}
func generateCSR(keySigner *signer, subj pkix.Name, host, instanceId, ip, uri string) (string, error) {
template := x509.CertificateRequest{
Subject: subj,
SignatureAlgorithm: keySigner.algorithm,
}
if host != "" {
template.DNSNames = []string{host}
}
if uri != "" {
uriptr, err := url.Parse(uri)
if err == nil {
template.URIs = []*url.URL{uriptr}
}
}
if instanceId != "" {
uriptr, err := url.Parse(instanceId)
if err == nil {
if len(template.URIs) > 0 {
template.URIs = append(template.URIs, uriptr)
} else {
template.URIs = []*url.URL{uriptr}
}
}
}
if ip != "" {
template.IPAddresses = []net.IP{net.ParseIP(ip)}
}
csr, err := x509.CreateCertificateRequest(rand.Reader, &template, keySigner.key)
if err != nil {
return "", fmt.Errorf("Cannot create CSR: %v", err)
}
block := &pem.Block{
Type: "CERTIFICATE REQUEST",
Bytes: csr,
}
var buf bytes.Buffer
err = pem.Encode(&buf, block)
if err != nil {
return "", fmt.Errorf("Cannot encode CSR to PEM: %v", err)
}
return buf.String(), nil
}
func getNToken(domain, service, keyID string, keyBytes []byte) (string, error) {
if keyID == "" {
return "", errors.New("Missing key-version for the specified private key")
}
// get token builder instance
builder, err := zmssvctoken.NewTokenBuilder(domain, service, keyBytes, keyID)
if err != nil {
return "", err
}
// set optional attributes
builder.SetExpiration(10 * time.Minute)
// get a token instance that always gives you unexpired tokens values
// safe for concurrent use
tok := builder.Token()
// get a token for use
return tok.Value()
}
func ntokenClient(ztsURL, domain, service, keyID, caCertFile, hdr string, keyBytes []byte) (*zts.ZTSClient, error) {
ntoken, err := getNToken(domain, service, keyID, keyBytes)
if err != nil {
return nil, err
}
transport := &http.Transport{
Proxy: http.ProxyFromEnvironment,
ResponseHeaderTimeout: 30 * time.Second,
}
if caCertFile != "" {
config := &tls.Config{}
certPool := x509.NewCertPool()
caCert, err := ioutil.ReadFile(caCertFile)
if err != nil {
return nil, err
}
certPool.AppendCertsFromPEM(caCert)
config.RootCAs = certPool
transport.TLSClientConfig = config
}
// use the ntoken to talk to Athenz
client := zts.NewClient(ztsURL, transport)
client.AddCredentials(hdr, ntoken)
return &client, nil
}
func certClient(ztsURL string, keyBytes []byte, certfile, caCertFile string) (*zts.ZTSClient, error) {
var certpem []byte
var err error
if certfile != "" {
certpem, err = ioutil.ReadFile(certfile)
if err != nil {
return nil, err
}
}
var cacertpem []byte
if caCertFile != "" {
cacertpem, err = ioutil.ReadFile(caCertFile)
if err != nil {
return nil, err
}
}
config, err := tlsConfiguration(keyBytes, certpem, cacertpem)
if err != nil {
return nil, err
}
transport := &http.Transport{
Proxy: http.ProxyFromEnvironment,
TLSClientConfig: config,
}
client := zts.NewClient(ztsURL, transport)
return &client, nil
}
func tlsConfiguration(keypem, certpem, cacertpem []byte) (*tls.Config, error) {
config := &tls.Config{}
if certpem != nil && keypem != nil {
mycert, err := tls.X509KeyPair(certpem, keypem)
if err != nil {
return nil, err
}
config.Certificates = make([]tls.Certificate, 1)
config.Certificates[0] = mycert
}
if cacertpem != nil {
certPool := x509.NewCertPool()
certPool.AppendCertsFromPEM(cacertpem)
config.RootCAs = certPool
}
return config, nil
}