feat(libcrypto): move into the Portainer repository EE-5476 (#10230)

pkg/libcrypto/LICENSE

@@ -0,0 +1,17 @@
+Copyright (c) 2018-2020 Portainer.io
+
+This software is provided 'as-is', without any express or implied
+warranty.  In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+1. The origin of this software must not be misrepresented; you must not
+   claim that you wrote the original software. If you use this software
+   in a product, an acknowledgment in the product documentation would be
+   appreciated but is not required.
+2. Altered source versions must be plainly marked as such, and must not be
+   misrepresented as being the original software.
+3. This notice may not be removed or altered from any source distribution.

pkg/libcrypto/README.md

@@ -0,0 +1,3 @@
+# libcrypto
+
+A small library providing encryption and decryption functions.

pkg/libcrypto/decrypt.go

@@ -0,0 +1,35 @@
+package libcrypto
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"errors"
+)
+
+// Decrypt decrypts data using 256-bit AES-GCM.  This both hides the content of
+// the data and provides a check that it hasn't been altered. Expects input
+// form nonce|ciphertext|tag where '|' indicates concatenation.
+// Creates a 32bit hash of the key before decrypting the data.
+func Decrypt(data []byte, key []byte) ([]byte, error) {
+	hashKey := Hash32Bit(key)
+
+	block, err := aes.NewCipher(hashKey)
+	if err != nil {
+		return nil, err
+	}
+
+	gcm, err := cipher.NewGCM(block)
+	if err != nil {
+		return nil, err
+	}
+
+	if len(data) < gcm.NonceSize() {
+		return nil, errors.New("malformed ciphertext")
+	}
+
+	return gcm.Open(nil,
+		data[:gcm.NonceSize()],
+		data[gcm.NonceSize():],
+		nil,
+	)
+}

pkg/libcrypto/encrypt.go

@@ -0,0 +1,34 @@
+package libcrypto
+
+import (
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/rand"
+	"io"
+)
+
+// Encrypt encrypts data using 256-bit AES-GCM.  This both hides the content of
+// the data and provides a check that it hasn't been altered. Output takes the
+// form nonce|ciphertext|tag where '|' indicates concatenation.
+// Creates a 32bit hash of the key before encrypting the data.
+func Encrypt(data, key []byte) ([]byte, error) {
+	hashKey := Hash32Bit(key)
+
+	block, err := aes.NewCipher(hashKey)
+	if err != nil {
+		return nil, err
+	}
+
+	gcm, err := cipher.NewGCM(block)
+	if err != nil {
+		return nil, err
+	}
+
+	nonce := make([]byte, gcm.NonceSize())
+	_, err = io.ReadFull(rand.Reader, nonce)
+	if err != nil {
+		return nil, err
+	}
+
+	return gcm.Seal(nonce, nonce, data, nil), nil
+}

pkg/libcrypto/hash.go

@@ -0,0 +1,19 @@
+package libcrypto
+
+import (
+	"crypto/md5"
+	"encoding/hex"
+)
+
+// HashFromBytes returns the hash of the specified data
+func HashFromBytes(data []byte) []byte {
+	digest := md5.New()
+	digest.Write(data)
+	return digest.Sum(nil)
+}
+
+// Hash32Bit returns a hexadecimal encoded hash
+func Hash32Bit(data []byte) []byte {
+	hash := HashFromBytes(data)
+	return []byte(hex.EncodeToString(hash))
+}

pkg/libcrypto/ssl.go

@@ -0,0 +1,82 @@
+package libcrypto
+
+import (
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"crypto/rand"
+	"crypto/x509"
+	"encoding/pem"
+	"errors"
+	"math/big"
+	"net"
+	"os"
+	"time"
+)
+
+// GenerateCertsForHost generates a self-signed certificate for host and saves them at certPath and keyPath
+func GenerateCertsForHost(hostname, ip, certPath, keyPath string, expiry time.Time) error {
+	serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
+	serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
+	if err != nil {
+		return err
+	}
+
+	template := x509.Certificate{
+		SerialNumber:          serialNumber,
+		NotAfter:              expiry,
+		NotBefore:             time.Now(),
+		KeyUsage:              x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature,
+		ExtKeyUsage:           []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth},
+		BasicConstraintsValid: true,
+	}
+
+	parsedIP := net.ParseIP(ip)
+	if parsedIP == nil {
+		return errors.New("Failed parsing host ip")
+	}
+
+	template.DNSNames = append(template.DNSNames, hostname)
+	template.IPAddresses = append(template.IPAddresses, parsedIP)
+
+	keyPair, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+	if err != nil {
+		return err
+	}
+
+	encodedCert, err := x509.CreateCertificate(rand.Reader, &template, &template, &keyPair.PublicKey, keyPair)
+	if err != nil {
+		return err
+	}
+
+	err = createPEMEncodedFile(certPath, "CERTIFICATE", encodedCert)
+	if err != nil {
+		return err
+	}
+
+	key, err := x509.MarshalECPrivateKey(keyPair)
+	if err != nil {
+		return err
+	}
+
+	err = createPEMEncodedFile(keyPath, "EC PRIVATE KEY", key)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func createPEMEncodedFile(path, header string, data []byte) error {
+	file, err := os.OpenFile(path, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0600)
+	if err != nil {
+		return err
+	}
+	defer file.Close()
+
+	err = pem.Encode(file, &pem.Block{Type: header, Bytes: data})
+	if err != nil {
+		return err
+	}
+
+	return nil
+}