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tls_info.go
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tls_info.go
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package server
import (
"crypto/tls"
"crypto/x509"
"encoding/pem"
"fmt"
"io/ioutil"
)
// TLSInfo holds the SSL certificates paths.
type TLSInfo struct {
CertFile string `json:"CertFile"`
KeyFile string `json:"KeyFile"`
CAFile string `json:"CAFile"`
}
func (info TLSInfo) Scheme() string {
if info.KeyFile != "" && info.CertFile != "" {
return "https"
} else {
return "http"
}
}
// Generates a tls.Config object for a server from the given files.
func (info TLSInfo) ServerConfig() (*tls.Config, error) {
// Both the key and cert must be present.
if info.KeyFile == "" || info.CertFile == "" {
return nil, fmt.Errorf("KeyFile and CertFile must both be present[key: %v, cert: %v]", info.KeyFile, info.CertFile)
}
var cfg tls.Config
tlsCert, err := tls.LoadX509KeyPair(info.CertFile, info.KeyFile)
if err != nil {
return nil, err
}
cfg.Certificates = []tls.Certificate{tlsCert}
if info.CAFile != "" {
cfg.ClientAuth = tls.RequireAndVerifyClientCert
cp, err := newCertPool(info.CAFile)
if err != nil {
return nil, err
}
cfg.RootCAs = cp
cfg.ClientCAs = cp
} else {
cfg.ClientAuth = tls.NoClientCert
}
return &cfg, nil
}
// Generates a tls.Config object for a client from the given files.
func (info TLSInfo) ClientConfig() (*tls.Config, error) {
var cfg tls.Config
if info.KeyFile == "" || info.CertFile == "" {
return &cfg, nil
}
tlsCert, err := tls.LoadX509KeyPair(info.CertFile, info.KeyFile)
if err != nil {
return nil, err
}
cfg.Certificates = []tls.Certificate{tlsCert}
if info.CAFile != "" {
cp, err := newCertPool(info.CAFile)
if err != nil {
return nil, err
}
cfg.RootCAs = cp
}
return &cfg, nil
}
// newCertPool creates x509 certPool with provided CA file
func newCertPool(CAFile string) (*x509.CertPool, error) {
certPool := x509.NewCertPool()
pemByte, err := ioutil.ReadFile(CAFile)
if err != nil {
return nil, err
}
for {
var block *pem.Block
block, pemByte = pem.Decode(pemByte)
if block == nil {
return certPool, nil
}
cert, err := x509.ParseCertificate(block.Bytes)
if err != nil {
return nil, err
}
certPool.AddCert(cert)
}
}