113 lines
2.7 KiB
Go
113 lines
2.7 KiB
Go
// +build ignore
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package main
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import (
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"bytes"
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"crypto/tls"
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"crypto/x509"
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"encoding/pem"
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"log"
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"os"
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"time"
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"git.sr.ht/~adnano/gmi"
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)
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func main() {
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var server gmi.Server
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if err := server.CertificateStore.Load("/var/lib/gemini/certs"); err != nil {
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log.Fatal(err)
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}
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server.GetCertificate = func(hostname string, store *gmi.CertificateStore) *tls.Certificate {
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cert, err := store.Lookup(hostname)
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if err != nil {
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switch err {
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case gmi.ErrCertificateExpired:
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// Generate a new certificate if the current one is expired.
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log.Print("Old certificate expired, creating new one")
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fallthrough
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case gmi.ErrCertificateUnknown:
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// Generate a certificate if one does not exist.
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cert, err := gmi.NewCertificate(hostname, time.Minute)
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if err != nil {
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// Failed to generate new certificate, abort
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return nil
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}
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// Store and return the new certificate
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err = writeCertificate("/var/lib/gemini/certs/"+hostname, cert)
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if err != nil {
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return nil
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}
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store.Add(hostname, cert)
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return &cert
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}
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}
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return cert
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}
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var mux gmi.ServeMux
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mux.Handle("/", gmi.FileServer(gmi.Dir("/var/www")))
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server.Register("localhost", &mux)
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if err := server.ListenAndServe(); err != nil {
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log.Fatal(err)
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}
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}
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// writeCertificate writes the provided certificate and private key
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// to path.crt and path.key respectively.
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func writeCertificate(path string, cert tls.Certificate) error {
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crt, err := marshalX509Certificate(cert.Leaf.Raw)
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if err != nil {
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return err
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}
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key, err := marshalPrivateKey(cert.PrivateKey)
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if err != nil {
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return err
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}
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// Write the certificate
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crtPath := path + ".crt"
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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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keyPath := path + ".key"
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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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// marshalX509Certificate returns a PEM-encoded version of the given raw certificate.
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func marshalX509Certificate(cert []byte) ([]byte, error) {
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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, err
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}
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return b.Bytes(), nil
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}
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// marshalPrivateKey returns PEM encoded versions of the given certificate and private key.
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func marshalPrivateKey(priv interface{}) ([]byte, error) {
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var b bytes.Buffer
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privBytes, err := x509.MarshalPKCS8PrivateKey(priv)
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if err != nil {
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return 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, err
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}
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return b.Bytes(), nil
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}
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