/
transit_client.go
202 lines (179 loc) · 5.03 KB
/
transit_client.go
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package transit
import (
"encoding/base64"
"fmt"
"os"
"path"
"strconv"
log "github.com/hashicorp/go-hclog"
"github.com/hashicorp/vault/api"
)
type transitClientEncryptor interface {
Close()
Encrypt(plaintext []byte) (ciphertext []byte, err error)
Decrypt(ciphertext []byte) (plaintext []byte, err error)
}
type transitClient struct {
client *api.Client
renewer *api.Renewer
mountPath string
keyName string
}
func newTransitClient(logger log.Logger, config map[string]string) (*transitClient, map[string]string, error) {
if config == nil {
config = map[string]string{}
}
var mountPath, keyName string
switch {
case os.Getenv("VAULT_TRANSIT_SEAL_MOUNT_PATH") != "":
mountPath = os.Getenv("VAULT_TRANSIT_SEAL_MOUNT_PATH")
case config["mount_path"] != "":
mountPath = config["mount_path"]
default:
return nil, nil, fmt.Errorf("mount_path is required")
}
switch {
case os.Getenv("VAULT_TRANSIT_SEAL_KEY_NAME") != "":
keyName = os.Getenv("VAULT_TRANSIT_SEAL_KEY_NAME")
case config["key_name"] != "":
keyName = config["key_name"]
default:
return nil, nil, fmt.Errorf("key_name is required")
}
var disableRenewal bool
var disableRenewalRaw string
switch {
case os.Getenv("VAULT_TRANSIT_SEAL_DISABLE_RENEWAL") != "":
disableRenewalRaw = os.Getenv("VAULT_TRANSIT_SEAL_DISABLE_RENEWAL")
case config["disable_renewal"] != "":
disableRenewalRaw = config["disable_renewal"]
}
if disableRenewalRaw != "" {
var err error
disableRenewal, err = strconv.ParseBool(disableRenewalRaw)
if err != nil {
return nil, nil, err
}
}
var namespace string
switch {
case os.Getenv("VAULT_NAMESPACE") != "":
namespace = os.Getenv("VAULT_NAMESPACE")
case config["namespace"] != "":
namespace = config["namespace"]
}
apiConfig := api.DefaultConfig()
if config["address"] != "" {
apiConfig.Address = config["address"]
}
if config["tls_ca_cert"] != "" || config["tls_ca_path"] != "" || config["tls_client_cert"] != "" || config["tls_client_key"] != "" ||
config["tls_server_name"] != "" || config["tls_skip_verify"] != "" {
var tlsSkipVerify bool
if config["tls_skip_verify"] != "" {
var err error
tlsSkipVerify, err = strconv.ParseBool(config["tls_skip_verify"])
if err != nil {
return nil, nil, err
}
}
tlsConfig := &api.TLSConfig{
CACert: config["tls_ca_cert"],
CAPath: config["tls_ca_path"],
ClientCert: config["tls_client_cert"],
ClientKey: config["tls_client_key"],
TLSServerName: config["tls_server_name"],
Insecure: tlsSkipVerify,
}
if err := apiConfig.ConfigureTLS(tlsConfig); err != nil {
return nil, nil, err
}
}
apiClient, err := api.NewClient(apiConfig)
if err != nil {
return nil, nil, err
}
if config["token"] != "" {
apiClient.SetToken(config["token"])
}
if namespace != "" {
apiClient.SetNamespace(namespace)
}
if apiClient.Token() == "" {
logger.Info("no token provided to transit auto-seal")
}
client := &transitClient{
client: apiClient,
mountPath: mountPath,
keyName: keyName,
}
if !disableRenewal && apiClient.Token() != "" {
// Renew the token immediately to get a secret to pass to renewer
secret, err := apiClient.Auth().Token().RenewTokenAsSelf(apiClient.Token(), 0)
// If we don't get an error renewing, set up a renewer. The token may not be renewable or not have
// permission to renew-self.
if err == nil {
renewer, err := apiClient.NewRenewer(&api.RenewerInput{
Secret: secret,
})
if err != nil {
return nil, nil, err
}
client.renewer = renewer
go func() {
for {
select {
case err := <-renewer.DoneCh():
logger.Info("shutting down token renewal")
if err != nil {
logger.Error("error renewing token", "error", err)
}
return
case <-renewer.RenewCh():
logger.Trace("successfully renewed token")
}
}
}()
go renewer.Renew()
} else {
logger.Info("unable to renew token, disabling renewal", "err", err)
}
}
sealInfo := make(map[string]string)
sealInfo["address"] = apiClient.Address()
sealInfo["mount_path"] = mountPath
sealInfo["key_name"] = keyName
if namespace != "" {
sealInfo["namespace"] = namespace
}
return client, sealInfo, nil
}
func (c *transitClient) Close() {
if c.renewer != nil {
c.renewer.Stop()
}
}
func (c *transitClient) Encrypt(plaintext []byte) ([]byte, error) {
encPlaintext := base64.StdEncoding.EncodeToString(plaintext)
path := path.Join(c.mountPath, "encrypt", c.keyName)
secret, err := c.client.Logical().Write(path, map[string]interface{}{
"plaintext": encPlaintext,
})
if err != nil {
return nil, err
}
return []byte(secret.Data["ciphertext"].(string)), nil
}
func (c *transitClient) Decrypt(ciphertext []byte) ([]byte, error) {
path := path.Join(c.mountPath, "decrypt", c.keyName)
secret, err := c.client.Logical().Write(path, map[string]interface{}{
"ciphertext": string(ciphertext),
})
if err != nil {
return nil, err
}
plaintext, err := base64.StdEncoding.DecodeString(secret.Data["plaintext"].(string))
if err != nil {
return nil, err
}
return plaintext, nil
}