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/*
* 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 (
"bytes"
"crypto"
"crypto/tls"
"crypto/x509"
"encoding/base64"
"golang.org/x/crypto/openpgp"
"golang.org/x/crypto/openpgp/packet"
"io/ioutil"
smslogger "sms/log"
)
var tlsConfig *tls.Config
func checkError(err error, topic string) error {
if err != nil {
smslogger.WriteError(topic + ": " + err.Error())
return err
}
return nil
}
// 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) (*tls.Config, error) {
// Initialize tlsConfig once
if tlsConfig == nil {
caCert, err := ioutil.ReadFile(caCertFile)
if err != nil {
return nil, err
}
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,
}
tlsConfig.BuildNameToCertificate()
}
return tlsConfig, nil
}
// GeneratePGPKeyPair produces a PGP key pair and returns
// two things:
// A base64 encoded form of the public part of the entity
// A base64 encoded form of the private key
func GeneratePGPKeyPair() (string, string, error) {
var entity *openpgp.Entity
config := &packet.Config{
DefaultHash: crypto.SHA256,
}
entity, err := openpgp.NewEntity("aaf.sms.init", "PGP Key for unsealing", "", config)
if err != nil {
smslogger.WriteError(err.Error())
return "", "", err
}
// Sign the identity in the entity
for _, id := range entity.Identities {
err = id.SelfSignature.SignUserId(id.UserId.Id, entity.PrimaryKey, entity.PrivateKey, nil)
if err != nil {
smslogger.WriteError(err.Error())
return "", "", err
}
}
// Sign the subkey in the entity
for _, subkey := range entity.Subkeys {
err := subkey.Sig.SignKey(subkey.PublicKey, entity.PrivateKey, nil)
if err != nil {
smslogger.WriteError(err.Error())
return "", "", err
}
}
buffer := new(bytes.Buffer)
entity.Serialize(buffer)
pbkey := base64.StdEncoding.EncodeToString(buffer.Bytes())
buffer.Reset()
entity.SerializePrivate(buffer, nil)
prkey := base64.StdEncoding.EncodeToString(buffer.Bytes())
return pbkey, prkey, nil
}
// EncryptPGPString takes data and a public key and encrypts using that
// public key
func EncryptPGPString(data string, pbKey string) (string, error) {
pbKeyBytes, err := base64.StdEncoding.DecodeString(pbKey)
if checkError(err, "Decoding Base64 Public Key") != nil {
return "", err
}
dataBytes := []byte(data)
pbEntity, err := openpgp.ReadEntity(packet.NewReader(bytes.NewBuffer(pbKeyBytes)))
if checkError(err, "Reading entity from PGP key") != nil {
return "", err
}
// encrypt string
buf := new(bytes.Buffer)
out, err := openpgp.Encrypt(buf, []*openpgp.Entity{pbEntity}, nil, nil, nil)
if checkError(err, "Creating Encryption Pipe") != nil {
return "", err
}
_, err = out.Write(dataBytes)
if checkError(err, "Writing to Encryption Pipe") != nil {
return "", err
}
err = out.Close()
if checkError(err, "Closing Encryption Pipe") != nil {
return "", err
}
crp := base64.StdEncoding.EncodeToString(buf.Bytes())
return crp, nil
}
// DecryptPGPString decrypts a PGP encoded input string and returns
// a base64 representation of the decoded string
func DecryptPGPString(data string, prKey string) (string, error) {
// Convert private key to bytes from base64
prKeyBytes, err := base64.StdEncoding.DecodeString(prKey)
if err != nil {
smslogger.WriteError("Error Decoding base64 private key: " + err.Error())
return "", err
}
dataBytes, err := base64.StdEncoding.DecodeString(data)
if err != nil {
smslogger.WriteError("Error Decoding base64 data: " + err.Error())
return "", err
}
prEntity, err := openpgp.ReadEntity(packet.NewReader(bytes.NewBuffer(prKeyBytes)))
if err != nil {
smslogger.WriteError("Error reading entity from PGP key: " + err.Error())
return "", err
}
prEntityList := &openpgp.EntityList{prEntity}
message, err := openpgp.ReadMessage(bytes.NewBuffer(dataBytes), prEntityList, nil, nil)
if err != nil {
smslogger.WriteError("Error Decrypting message: " + err.Error())
return "", err
}
var retBuf bytes.Buffer
retBuf.ReadFrom(message.UnverifiedBody)
return retBuf.String(), nil
}
// ReadFromFile reads a file and loads the PGP key into
// a string
func ReadFromFile(fileName string) (string, error) {
data, err := ioutil.ReadFile(fileName)
if err != nil {
smslogger.WriteError(err.Error())
smslogger.WriteError("Cannot read file: " + fileName)
return "", err
}
return string(data), nil
}
// WriteToFile writes a PGP key into a file.
// It will truncate the file if it exists
func WriteToFile(data string, fileName string) error {
err := ioutil.WriteFile(fileName, []byte(data), 0600)
if err != nil {
smslogger.WriteError(err.Error())
smslogger.WriteError("Cannot write to file: " + fileName)
return err
}
return nil
}
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