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Diffstat (limited to 'src/k8splugin/internal/auth/auth.go')
-rw-r--r--src/k8splugin/internal/auth/auth.go107
1 files changed, 107 insertions, 0 deletions
diff --git a/src/k8splugin/internal/auth/auth.go b/src/k8splugin/internal/auth/auth.go
new file mode 100644
index 00000000..3da8f2af
--- /dev/null
+++ b/src/k8splugin/internal/auth/auth.go
@@ -0,0 +1,107 @@
+/*
+ * Copyright 2018 Intel Corporation, Inc
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package auth
+
+import (
+ "crypto/tls"
+ "crypto/x509"
+ "encoding/base64"
+ "encoding/pem"
+ "io/ioutil"
+ "log"
+
+ pkgerrors "github.com/pkg/errors"
+)
+
+// GetTLSConfig initializes a tlsConfig using the CA's certificate
+// This config is then used to enable the server for mutual TLS
+func GetTLSConfig(caCertFile string, certFile string, keyFile string) (*tls.Config, error) {
+
+ // Initialize tlsConfig once
+ caCert, err := ioutil.ReadFile(caCertFile)
+
+ if err != nil {
+ return nil, pkgerrors.Wrap(err, "Read CA Cert file")
+ }
+
+ caCertPool := x509.NewCertPool()
+ caCertPool.AppendCertsFromPEM(caCert)
+
+ tlsConfig := &tls.Config{
+ // Change to RequireAndVerify once we have mandatory certs
+ ClientAuth: tls.VerifyClientCertIfGiven,
+ ClientCAs: caCertPool,
+ MinVersion: tls.VersionTLS12,
+ }
+
+ certPEMBlk, err := readPEMBlock(certFile)
+ if err != nil {
+ return nil, pkgerrors.Wrap(err, "Read Cert File")
+ }
+
+ keyPEMBlk, err := readPEMBlock(keyFile)
+ if err != nil {
+ return nil, pkgerrors.Wrap(err, "Read Key File")
+ }
+
+ tlsConfig.Certificates = make([]tls.Certificate, 1)
+ tlsConfig.Certificates[0], err = tls.X509KeyPair(certPEMBlk, keyPEMBlk)
+ if err != nil {
+ return nil, pkgerrors.Wrap(err, "Load x509 cert and key")
+ }
+
+ tlsConfig.BuildNameToCertificate()
+ return tlsConfig, nil
+}
+
+func readPEMBlock(filename string) ([]byte, error) {
+
+ pemData, err := ioutil.ReadFile(filename)
+ if err != nil {
+ return nil, pkgerrors.Wrap(err, "Read PEM File")
+ }
+
+ pemBlock, rest := pem.Decode(pemData)
+ if len(rest) > 0 {
+ log.Println("Pemfile has extra data")
+ }
+
+ if x509.IsEncryptedPEMBlock(pemBlock) {
+ password, err := ioutil.ReadFile(filename + ".pass")
+ if err != nil {
+ return nil, pkgerrors.Wrap(err, "Read Password File")
+ }
+
+ pByte, err := base64.StdEncoding.DecodeString(string(password))
+ if err != nil {
+ return nil, pkgerrors.Wrap(err, "Decode PEM Password")
+ }
+
+ pemData, err = x509.DecryptPEMBlock(pemBlock, pByte)
+ if err != nil {
+ return nil, pkgerrors.Wrap(err, "Decrypt PEM Data")
+ }
+ var newPEMBlock pem.Block
+ newPEMBlock.Type = pemBlock.Type
+ newPEMBlock.Bytes = pemData
+ // Converting back to PEM from DER data you get from
+ // DecryptPEMBlock
+ pemData = pem.EncodeToMemory(&newPEMBlock)
+ }
+
+ return pemData, nil
+}