// 1) We do not want to force the user to buy a cert.
// 2) We still want our client (camput) to be able to
// verify the cert's authenticity.
// 3) We want to avoid MITM attacks and warnings in
// the browser.
// Using a simple self-signed won't do because of 3),
// as Chrome offers no way to set a self-signed as
// trusted when importing it. (same on android).
// We could have created a self-signed CA (that we
// would import in the browsers) and create another
// cert (signed by that CA) which would be the one
// used in camlistore.
// We're doing even simpler: create a self-signed
// CA and directly use it as a self-signed cert
// (and install it as a CA in the browsers).
// 2) is satisfied by doing our own checks,
// See pkg/client
func setupTLS(ws *webserver.Server, config *serverinit.Config, hostname string) {
cert, key := config.OptionalString("httpsCert", ""), config.OptionalString("httpsKey", "")
if !config.OptionalBool("https", true) {
return
}
if (cert != "") != (key != "") {
exitf("httpsCert and httpsKey must both be either present or absent")
}
defCert := osutil.DefaultTLSCert()
defKey := osutil.DefaultTLSKey()
const hint = "You must add this certificate's fingerprint to your client's trusted certs list to use it. Like so:\n\"trustedCerts\": [\"%s\"],"
if cert == defCert && key == defKey {
_, err1 := wkfs.Stat(cert)
_, err2 := wkfs.Stat(key)
if err1 != nil || err2 != nil {
if os.IsNotExist(err1) || os.IsNotExist(err2) {
sig, err := httputil.GenSelfTLSFiles(hostname, defCert, defKey)
if err != nil {
exitf("Could not generate self-signed TLS cert: %q", err)
}
log.Printf(hint, sig)
} else {
exitf("Could not stat cert or key: %q, %q", err1, err2)
}
}
}
// Always generate new certificates if the config's httpsCert and httpsKey are empty.
if cert == "" && key == "" {
sig, err := httputil.GenSelfTLSFiles(hostname, defCert, defKey)
if err != nil {
exitf("Could not generate self signed creds: %q", err)
}
log.Printf(hint, sig)
cert = defCert
key = defKey
}
data, err := wkfs.ReadFile(cert)
if err != nil {
exitf("Failed to read pem certificate: %s", err)
}
sig, err := httputil.CertFingerprint(data)
if err != nil {
exitf("certificate error: %v", err)
}
log.Printf("TLS enabled, with SHA-256 certificate fingerprint: %v", sig)
ws.SetTLS(cert, key)
}
// If cert/key files are specified, and found, use them.
// If cert/key files are specified, not found, and the default values, generate
// them (self-signed CA used as a cert), and use them.
// If cert/key files are not specified, use Let's Encrypt.
func setupTLS(ws *webserver.Server, config *serverinit.Config, hostname string) {
cert, key := config.OptionalString("httpsCert", ""), config.OptionalString("httpsKey", "")
if !config.OptionalBool("https", true) {
return
}
if (cert != "") != (key != "") {
exitf("httpsCert and httpsKey must both be either present or absent")
}
defCert := osutil.DefaultTLSCert()
defKey := osutil.DefaultTLSKey()
const hint = "You must add this certificate's fingerprint to your client's trusted certs list to use it. Like so:\n\"trustedCerts\": [\"%s\"],"
if cert == defCert && key == defKey {
_, err1 := wkfs.Stat(cert)
_, err2 := wkfs.Stat(key)
if err1 != nil || err2 != nil {
if os.IsNotExist(err1) || os.IsNotExist(err2) {
sig, err := httputil.GenSelfTLSFiles(hostname, defCert, defKey)
if err != nil {
exitf("Could not generate self-signed TLS cert: %q", err)
}
log.Printf(hint, sig)
} else {
exitf("Could not stat cert or key: %q, %q", err1, err2)
}
}
}
if cert == "" && key == "" {
// Use Let's Encrypt if no files are specified, and we have a usable hostname.
if netutil.IsFQDN(hostname) {
m := autocert.Manager{
Prompt: autocert.AcceptTOS,
HostPolicy: autocert.HostWhitelist(hostname),
Cache: autocert.DirCache(osutil.DefaultLetsEncryptCache()),
}
log.Print("TLS enabled, with Let's Encrypt")
ws.SetTLS(webserver.TLSSetup{
CertManager: m.GetCertificate,
})
return
}
// Otherwise generate new certificates
sig, err := httputil.GenSelfTLSFiles(hostname, defCert, defKey)
if err != nil {
exitf("Could not generate self signed creds: %q", err)
}
log.Printf(hint, sig)
cert = defCert
key = defKey
}
data, err := wkfs.ReadFile(cert)
if err != nil {
exitf("Failed to read pem certificate: %s", err)
}
sig, err := httputil.CertFingerprint(data)
if err != nil {
exitf("certificate error: %v", err)
}
log.Printf("TLS enabled, with SHA-256 certificate fingerprint: %v", sig)
ws.SetTLS(webserver.TLSSetup{
CertFile: cert,
KeyFile: key,
})
}