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@@ -0,0 +1,136 @@
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+package transport
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+
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+import (
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+ "crypto/rand"
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+ "crypto/rsa"
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+ "crypto/tls"
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+ "crypto/x509"
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+ "encoding/pem"
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+ "io/ioutil"
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+ "math/big"
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+)
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+
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+/*
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+ Example for self-signed certificates by openssl:
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+
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+ Self CA:
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+ openssl genrsa -out ca.key 2048
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+ openssl req -x509 -new -nodes -key ca.key -subj "/CN=example.ca.com" -days 5000 -out ca.crt
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+
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+ Server:
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+ openssl genrsa -out server.key 2048
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+ openssl req -new -key server.key -subj "/CN=example.server.com" -out server.csr
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+ openssl x509 -req -in server.csr -CA ca.crt -CAkey ca.key -CAcreateserial -out server.crt -days 5000
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+
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+ Client:
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+ openssl genrsa -out client.key 2048
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+ openssl req -new -key client.key -subj "/CN=example.client.com" -out client.csr
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+ openssl x509 -req -in client.csr -CA ca.crt -CAkey ca.key -CAcreateserial -out client.crt -days 5000
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+
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+*/
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+
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+func newCustomTLSKeyPair(certfile, keyfile string) (*tls.Certificate, error) {
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+ tlsCert, err := tls.LoadX509KeyPair(certfile, keyfile)
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+ if err != nil {
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+ return nil, err
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+ }
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+ return &tlsCert, nil
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+}
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+
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+func newRandomTLSKeyPair() *tls.Certificate {
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+ key, err := rsa.GenerateKey(rand.Reader, 1024)
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+ if err != nil {
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+ panic(err)
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+ }
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+ template := x509.Certificate{SerialNumber: big.NewInt(1)}
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+ certDER, err := x509.CreateCertificate(
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+ rand.Reader,
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+ &template,
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+ &template,
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+ &key.PublicKey,
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+ key)
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+ if err != nil {
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+ panic(err)
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+ }
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+ keyPEM := pem.EncodeToMemory(&pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(key)})
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+ certPEM := pem.EncodeToMemory(&pem.Block{Type: "CERTIFICATE", Bytes: certDER})
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+
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+ tlsCert, err := tls.X509KeyPair(certPEM, keyPEM)
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+ if err != nil {
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+ panic(err)
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+ }
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+ return &tlsCert
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+}
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+
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+// Only supprt one ca file to add
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+func newCertPool(caPath string) (*x509.CertPool, error) {
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+ pool := x509.NewCertPool()
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+
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+ caCrt, err := ioutil.ReadFile(caPath)
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+ if err != nil {
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+ return nil, err
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+ }
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+
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+ pool.AppendCertsFromPEM(caCrt)
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+
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+ return pool, nil
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+}
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+
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+func NewServerTLSConfig(certPath, keyPath, caPath string) (*tls.Config, error) {
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+ var base = &tls.Config{}
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+
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+ if certPath == "" || keyPath == "" {
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+ // server will generate tls conf by itself
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+ cert := newRandomTLSKeyPair()
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+ base.Certificates = []tls.Certificate{*cert}
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+ } else {
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+ cert, err := newCustomTLSKeyPair(certPath, keyPath)
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+ if err != nil {
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+ return nil, err
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+ }
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+
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+ base.Certificates = []tls.Certificate{*cert}
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+ }
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+
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+ if caPath != "" {
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+ pool, err := newCertPool(caPath)
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+ if err != nil {
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+ return nil, err
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+ }
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+
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+ base.ClientAuth = tls.RequireAndVerifyClientCert
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+ base.ClientCAs = pool
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+ }
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+
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+ return base, nil
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+}
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+
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+func NewClientTLSConfig(certPath, keyPath, caPath, servearName string) (*tls.Config, error) {
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+ var base = &tls.Config{}
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+
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+ if certPath == "" || keyPath == "" {
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+ // client will not generate tls conf by itself
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+ } else {
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+ cert, err := newCustomTLSKeyPair(certPath, keyPath)
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+ if err != nil {
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+ return nil, err
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+ }
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+
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+ base.Certificates = []tls.Certificate{*cert}
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+ }
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+
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+ if caPath != "" {
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+ pool, err := newCertPool(caPath)
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+ if err != nil {
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+ return nil, err
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+ }
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+
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+ base.RootCAs = pool
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+ base.ServerName = servearName
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+ base.InsecureSkipVerify = false
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+ } else {
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+ base.InsecureSkipVerify = true
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+ }
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+
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+ return base, nil
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+}
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yuyulei