2020-09-28 00:20:59 +00:00
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package gmi
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2020-09-27 17:50:48 +00:00
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import (
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"bytes"
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"crypto/ed25519"
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"crypto/rand"
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2020-09-28 03:49:41 +00:00
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"crypto/tls"
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2020-09-27 17:50:48 +00:00
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"crypto/x509"
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"encoding/pem"
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"math/big"
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"net"
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"os"
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2020-10-12 04:06:20 +00:00
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"path/filepath"
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2020-09-27 17:50:48 +00:00
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"strings"
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"time"
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)
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// CertificateStore maps hostnames to certificates.
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2020-10-12 20:34:52 +00:00
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// The zero value of CertificateStore is an empty store ready to use.
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2020-10-12 03:48:18 +00:00
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type CertificateStore struct {
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store map[string]tls.Certificate
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}
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// Add adds a certificate for the given hostname to the store.
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func (c *CertificateStore) Add(hostname string, cert tls.Certificate) {
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if c.store == nil {
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c.store = map[string]tls.Certificate{}
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}
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c.store[hostname] = cert
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}
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// Lookup returns the certificate for the given hostname.
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func (c *CertificateStore) Lookup(hostname string) (*tls.Certificate, error) {
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cert, ok := c.store[hostname]
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if !ok {
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return nil, ErrUnknownCertificate
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}
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2020-10-12 04:06:20 +00:00
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// Ensure that the certificate is not expired
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if cert.Leaf != nil && cert.Leaf.NotAfter.Before(time.Now()) {
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return &cert, ErrInvalidCertificate
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}
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2020-10-12 03:48:18 +00:00
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return &cert, nil
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}
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// Load loads certificates from the given path.
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// The path should lead to a directory containing certificates and private keys
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// in the form hostname.crt and hostname.key.
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// For example, the hostname "localhost" would have the corresponding files
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// localhost.crt (certificate) and localhost.key (private key).
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func (c *CertificateStore) Load(path string) error {
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2020-10-12 04:06:20 +00:00
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if c.store == nil {
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c.store = map[string]tls.Certificate{}
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}
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matches, err := filepath.Glob(filepath.Join(path, "*.crt"))
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if err != nil {
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return err
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}
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for _, crtPath := range matches {
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keyPath := strings.TrimSuffix(crtPath, ".crt") + ".key"
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cert, err := tls.LoadX509KeyPair(crtPath, keyPath)
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if err != nil {
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continue
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}
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2020-10-12 04:13:24 +00:00
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hostname := strings.TrimSuffix(filepath.Base(crtPath), ".crt")
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c.store[hostname] = cert
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}
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return nil
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}
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2020-09-27 17:50:48 +00:00
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2020-09-28 03:49:41 +00:00
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// NewCertificate creates and returns a new parsed certificate.
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func NewCertificate(host string, duration time.Duration) (tls.Certificate, error) {
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crt, key, err := NewRawCertificate(host, duration)
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if err != nil {
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return tls.Certificate{}, err
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}
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return tls.X509KeyPair(crt, key)
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}
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2020-09-28 03:49:41 +00:00
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// NewRawCertificate creates and returns a raw certificate for the given host.
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2020-09-27 17:50:48 +00:00
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// It generates a self-signed TLS certificate and a ED25519 private key.
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func NewRawCertificate(host string, duration time.Duration) (crt, key []byte, err error) {
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// Generate a ED25519 private key
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_, priv, err := ed25519.GenerateKey(rand.Reader)
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if err != nil {
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return nil, nil, err
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}
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public := priv.Public().(ed25519.PublicKey)
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// ED25519 keys should have the DigitalSignature KeyUsage bits set
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// in the x509.Certificate template
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keyUsage := x509.KeyUsageDigitalSignature
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notBefore := time.Now()
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notAfter := notBefore.Add(duration)
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// Generate the serial number
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serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
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serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
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if err != nil {
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return nil, nil, err
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}
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template := x509.Certificate{
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SerialNumber: serialNumber,
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NotBefore: notBefore,
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NotAfter: notAfter,
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KeyUsage: keyUsage,
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ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
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BasicConstraintsValid: true,
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}
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hosts := strings.Split(host, ",")
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for _, h := range hosts {
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if ip := net.ParseIP(h); ip != nil {
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template.IPAddresses = append(template.IPAddresses, ip)
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} else {
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template.DNSNames = append(template.DNSNames, h)
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}
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}
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// Create the certificate
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cert, err := x509.CreateCertificate(rand.Reader, &template, &template, public, priv)
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if err != nil {
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return nil, nil, err
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}
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// Encode the certificate
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var b bytes.Buffer
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if err := pem.Encode(&b, &pem.Block{Type: "CERTIFICATE", Bytes: cert}); err != nil {
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return nil, nil, err
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}
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crt = b.Bytes()
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// Encode the key
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b = bytes.Buffer{}
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if err != nil {
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return nil, nil, err
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}
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privBytes, err := x509.MarshalPKCS8PrivateKey(priv)
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if err != nil {
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return nil, nil, err
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}
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if err := pem.Encode(&b, &pem.Block{Type: "PRIVATE KEY", Bytes: privBytes}); err != nil {
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return nil, nil, err
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}
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key = b.Bytes()
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return
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}
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2020-10-12 04:06:20 +00:00
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// WriteX509KeyPair writes the provided certificate and private key
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2020-09-28 06:13:46 +00:00
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// to path.crt and path.key respectively.
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2020-10-12 04:06:20 +00:00
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func WriteX509KeyPair(path string, crt, key []byte) error {
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2020-09-27 17:50:48 +00:00
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// Write the certificate
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crtPath := path + ".crt"
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2020-09-27 17:50:48 +00:00
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crtOut, err := os.OpenFile(crtPath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
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if err != nil {
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return err
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}
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if _, err := crtOut.Write(crt); err != nil {
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return err
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}
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// Write the private key
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2020-09-28 06:13:46 +00:00
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keyPath := path + ".key"
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2020-09-27 17:50:48 +00:00
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keyOut, err := os.OpenFile(keyPath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
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if err != nil {
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return err
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}
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if _, err := keyOut.Write(key); err != nil {
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return err
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}
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return nil
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}
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