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// MinIO Cloud Storage, (C) 2017-2019 MinIO, 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 crypto
import (
"errors"
"math/rand"
"net/http"
"reflect"
"strconv"
"strings"
"github.com/minio/minio/cmd/config"
"github.com/minio/minio/pkg/ellipses"
"github.com/minio/minio/pkg/env"
xnet "github.com/minio/minio/pkg/net"
)
// KMSConfig has the KMS config for hashicorp vault
type KMSConfig struct {
AutoEncryption bool `json:"-"`
Vault VaultConfig `json:"vault"`
Kes KesConfig `json:"kes"`
}
// KMS Vault constants.
const (
KMSVaultEndpoint = "endpoint"
KMSVaultCAPath = "capath"
KMSVaultKeyName = "key_name"
KMSVaultKeyVersion = "key_version"
KMSVaultNamespace = "namespace"
KMSVaultAuthType = "auth_type"
KMSVaultAppRoleID = "auth_approle_id"
KMSVaultAppRoleSecret = "auth_approle_secret"
)
// KMS kes constants.
const (
KMSKesEndpoint = "endpoint"
KMSKesKeyFile = "key_file"
KMSKesCertFile = "cert_file"
KMSKesCAPath = "capath"
KMSKesKeyName = "key_name"
)
// DefaultKVS - default KV crypto config
var (
DefaultVaultKVS = config.KVS{
config.KV{
Key: KMSVaultEndpoint,
Value: "",
},
config.KV{
Key: KMSVaultKeyName,
Value: "",
},
config.KV{
Key: KMSVaultAuthType,
Value: "approle",
},
config.KV{
Key: KMSVaultAppRoleID,
Value: "",
},
config.KV{
Key: KMSVaultAppRoleSecret,
Value: "",
},
config.KV{
Key: KMSVaultCAPath,
Value: "",
},
config.KV{
Key: KMSVaultKeyVersion,
Value: "",
},
config.KV{
Key: KMSVaultNamespace,
Value: "",
},
}
DefaultKesKVS = config.KVS{
config.KV{
Key: KMSKesEndpoint,
Value: "",
},
config.KV{
Key: KMSKesKeyName,
Value: "",
},
config.KV{
Key: KMSKesCertFile,
Value: "",
},
config.KV{
Key: KMSKesKeyFile,
Value: "",
},
config.KV{
Key: KMSKesCAPath,
Value: "",
},
}
)
const (
// EnvKMSMasterKey is the environment variable used to specify
// a KMS master key used to protect SSE-S3 per-object keys.
// Valid values must be of the from: "KEY_ID:32_BYTE_HEX_VALUE".
EnvKMSMasterKey = "MINIO_KMS_MASTER_KEY"
// EnvKMSAutoEncryption is the environment variable used to en/disable
// SSE-S3 auto-encryption. SSE-S3 auto-encryption, if enabled,
// requires a valid KMS configuration and turns any non-SSE-C
// request into an SSE-S3 request.
// If present EnvAutoEncryption must be either "on" or "off".
EnvKMSAutoEncryption = "MINIO_KMS_AUTO_ENCRYPTION"
)
const (
// EnvKMSVaultEndpoint is the environment variable used to specify
// the vault HTTPS endpoint.
EnvKMSVaultEndpoint = "MINIO_KMS_VAULT_ENDPOINT"
// EnvKMSVaultAuthType is the environment variable used to specify
// the authentication type for vault.
EnvKMSVaultAuthType = "MINIO_KMS_VAULT_AUTH_TYPE"
// EnvKMSVaultAppRoleID is the environment variable used to specify
// the vault AppRole ID.
EnvKMSVaultAppRoleID = "MINIO_KMS_VAULT_APPROLE_ID"
// EnvKMSVaultAppSecretID is the environment variable used to specify
// the vault AppRole secret corresponding to the AppRole ID.
EnvKMSVaultAppSecretID = "MINIO_KMS_VAULT_APPROLE_SECRET"
// EnvKMSVaultKeyVersion is the environment variable used to specify
// the vault key version.
EnvKMSVaultKeyVersion = "MINIO_KMS_VAULT_KEY_VERSION"
// EnvKMSVaultKeyName is the environment variable used to specify
// the vault named key-ring. In the S3 context it's referred as
// customer master key ID (CMK-ID).
EnvKMSVaultKeyName = "MINIO_KMS_VAULT_KEY_NAME"
// EnvKMSVaultCAPath is the environment variable used to specify the
// path to a directory of PEM-encoded CA cert files. These CA cert
// files are used to authenticate MinIO to Vault over mTLS.
EnvKMSVaultCAPath = "MINIO_KMS_VAULT_CAPATH"
// EnvKMSVaultNamespace is the environment variable used to specify
// vault namespace. The vault namespace is used if the enterprise
// version of Hashicorp Vault is used.
EnvKMSVaultNamespace = "MINIO_KMS_VAULT_NAMESPACE"
)
const (
// EnvKMSKesEndpoint is the environment variable used to specify
// one or multiple KES server HTTPS endpoints. The individual
// endpoints should be separated by ','.
EnvKMSKesEndpoint = "MINIO_KMS_KES_ENDPOINT"
// EnvKMSKesKeyFile is the environment variable used to specify
// the TLS private key used by MinIO to authenticate to the kes
// server HTTPS via mTLS.
EnvKMSKesKeyFile = "MINIO_KMS_KES_KEY_FILE"
// EnvKMSKesCertFile is the environment variable used to specify
// the TLS certificate used by MinIO to authenticate to the kes
// server HTTPS via mTLS.
EnvKMSKesCertFile = "MINIO_KMS_KES_CERT_FILE"
// EnvKMSKesCAPath is the environment variable used to specify
// the TLS root certificates used by MinIO to verify the certificate
// presented by to the kes server when establishing a TLS connection.
EnvKMSKesCAPath = "MINIO_KMS_KES_CA_PATH"
// EnvKMSKesKeyName is the environment variable used to specify
// the (default) key at the kes server. In the S3 context it's
// referred as customer master key ID (CMK-ID).
EnvKMSKesKeyName = "MINIO_KMS_KES_KEY_NAME"
)
var defaultVaultCfg = VaultConfig{
Auth: VaultAuth{
Type: "approle",
},
}
var defaultKesCfg = KesConfig{}
// EnabledVault returns true if HashiCorp Vault is enabled.
func EnabledVault(kvs config.KVS) bool {
endpoint := kvs.Get(KMSVaultEndpoint)
return endpoint != ""
}
// EnabledKes returns true if kes as KMS is enabled.
func EnabledKes(kvs config.KVS) bool {
endpoint := kvs.Get(KMSKesEndpoint)
return endpoint != ""
}
// LookupKesConfig lookup kes server configuration.
func LookupKesConfig(kvs config.KVS) (KesConfig, error) {
kesCfg := KesConfig{}
endpointStr := env.Get(EnvKMSKesEndpoint, kvs.Get(KMSKesEndpoint))
var endpoints []string
for _, endpoint := range strings.Split(endpointStr, ",") {
if strings.TrimSpace(endpoint) == "" {
continue
}
if !ellipses.HasEllipses(endpoint) {
endpoints = append(endpoints, endpoint)
continue
}
pattern, err := ellipses.FindEllipsesPatterns(endpoint)
if err != nil {
return kesCfg, err
}
for _, p := range pattern {
endpoints = append(endpoints, p.Expand()...)
}
}
if len(endpoints) == 0 {
return kesCfg, nil
}
randNum := rand.Intn(len(endpoints) + 1) // We add 1 b/c len(endpoints) may be 0: See: rand.Intn docs
kesCfg.Endpoint = make([]string, len(endpoints))
for i, endpoint := range endpoints {
endpoint, err := xnet.ParseHTTPURL(endpoint)
if err != nil {
return kesCfg, err
}
kesCfg.Endpoint[(randNum+i)%len(endpoints)] = endpoint.String()
}
kesCfg.KeyFile = env.Get(EnvKMSKesKeyFile, kvs.Get(KMSKesKeyFile))
kesCfg.CertFile = env.Get(EnvKMSKesCertFile, kvs.Get(KMSKesCertFile))
kesCfg.CAPath = env.Get(EnvKMSKesCAPath, kvs.Get(KMSKesCAPath))
kesCfg.DefaultKeyID = env.Get(EnvKMSKesKeyName, kvs.Get(KMSKesKeyName))
if reflect.DeepEqual(kesCfg, defaultKesCfg) {
return kesCfg, nil
}
// Verify all the proper settings.
if err := kesCfg.Verify(); err != nil {
return kesCfg, err
}
kesCfg.Enabled = true
return kesCfg, nil
}
func lookupAutoEncryption() (bool, error) {
autoBool, err := config.ParseBool(env.Get(EnvAutoEncryptionLegacy, config.EnableOff))
if err != nil {
return false, err
}
if !autoBool {
autoBool, err = config.ParseBool(env.Get(EnvKMSAutoEncryption, config.EnableOff))
if err != nil {
return false, err
}
}
return autoBool, nil
}
// LookupConfig lookup vault or kes config, returns KMSConfig
// to configure KMS object for object encryption
func LookupConfig(c config.Config, defaultRootCAsDir string, transport *http.Transport) (KMSConfig, error) {
vcfg, err := LookupVaultConfig(c[config.KmsVaultSubSys][config.Default])
if err != nil {
return KMSConfig{}, err
}
kesCfg, err := LookupKesConfig(c[config.KmsKesSubSys][config.Default])
if err != nil {
return KMSConfig{}, err
}
kesCfg.Transport = transport
if kesCfg.Enabled && kesCfg.CAPath == "" {
kesCfg.CAPath = defaultRootCAsDir
}
autoEncrypt, err := lookupAutoEncryption()
if err != nil {
return KMSConfig{}, err
}
kmsCfg := KMSConfig{
AutoEncryption: autoEncrypt,
Vault: vcfg,
Kes: kesCfg,
}
return kmsCfg, nil
}
// LookupVaultConfig extracts the KMS configuration provided by environment
// variables and merge them with the provided KMS configuration. The
// merging follows the following rules:
//
// 1. A valid value provided as environment variable is higher prioritized
// than the provided configuration and overwrites the value from the
// configuration file.
//
// 2. A value specified as environment variable never changes the configuration
// file. So it is never made a persistent setting.
//
// It sets the global KMS configuration according to the merged configuration
// on succes.
func LookupVaultConfig(kvs config.KVS) (VaultConfig, error) {
if err := config.CheckValidKeys(config.KmsVaultSubSys, kvs, DefaultVaultKVS); err != nil {
return VaultConfig{}, err
}
vcfg, err := lookupConfigLegacy(kvs)
if err != nil {
return vcfg, err
}
if vcfg.Enabled {
return vcfg, nil
}
vcfg = VaultConfig{
Auth: VaultAuth{
Type: "approle",
},
}
endpointStr := env.Get(EnvKMSVaultEndpoint, kvs.Get(KMSVaultEndpoint))
if endpointStr != "" {
// Lookup Hashicorp-Vault configuration & overwrite config entry if ENV var is present
endpoint, err := xnet.ParseHTTPURL(endpointStr)
if err != nil {
return vcfg, err
}
endpointStr = endpoint.String()
}
vcfg.Endpoint = endpointStr
vcfg.CAPath = env.Get(EnvKMSVaultCAPath, kvs.Get(KMSVaultCAPath))
vcfg.Auth.Type = env.Get(EnvKMSVaultAuthType, kvs.Get(KMSVaultAuthType))
if vcfg.Auth.Type == "" {
vcfg.Auth.Type = "approle"
}
vcfg.Auth.AppRole.ID = env.Get(EnvKMSVaultAppRoleID, kvs.Get(KMSVaultAppRoleID))
vcfg.Auth.AppRole.Secret = env.Get(EnvKMSVaultAppSecretID, kvs.Get(KMSVaultAppRoleSecret))
vcfg.Key.Name = env.Get(EnvKMSVaultKeyName, kvs.Get(KMSVaultKeyName))
vcfg.Namespace = env.Get(EnvKMSVaultNamespace, kvs.Get(KMSVaultNamespace))
if keyVersion := env.Get(EnvKMSVaultKeyVersion, kvs.Get(KMSVaultKeyVersion)); keyVersion != "" {
vcfg.Key.Version, err = strconv.Atoi(keyVersion)
if err != nil {
return vcfg, Errorf("Unable to parse VaultKeyVersion value (`%s`)", keyVersion)
}
}
if reflect.DeepEqual(vcfg, defaultVaultCfg) {
return vcfg, nil
}
// Verify all the proper settings.
if err = vcfg.Verify(); err != nil {
return vcfg, err
}
vcfg.Enabled = true
return vcfg, nil
}
// NewKMS - initialize a new KMS.
func NewKMS(cfg KMSConfig) (kms KMS, err error) {
// Lookup KMS master kes - only available through ENV.
if masterKeyLegacy := env.Get(EnvKMSMasterKeyLegacy, ""); len(masterKeyLegacy) != 0 {
if cfg.Vault.Enabled { // Vault and KMS master key provided
return kms, errors.New("Ambiguous KMS configuration: vault configuration and a master key are provided at the same time")
}
if cfg.Kes.Enabled {
return kms, errors.New("Ambiguous KMS configuration: kes configuration and a master key are provided at the same time")
}
kms, err = ParseMasterKey(masterKeyLegacy)
if err != nil {
return kms, err
}
} else if masterKey := env.Get(EnvKMSMasterKey, ""); len(masterKey) != 0 {
if cfg.Vault.Enabled { // Vault and KMS master key provided
return kms, errors.New("Ambiguous KMS configuration: vault configuration and a master key are provided at the same time")
}
if cfg.Kes.Enabled {
return kms, errors.New("Ambiguous KMS configuration: kes configuration and a master key are provided at the same time")
}
kms, err = ParseMasterKey(masterKey)
if err != nil {
return kms, err
}
} else if cfg.Vault.Enabled && cfg.Kes.Enabled {
return kms, errors.New("Ambiguous KMS configuration: vault configuration and kes configuration are provided at the same time")
} else if cfg.Vault.Enabled {
kms, err = NewVault(cfg.Vault)
if err != nil {
return kms, err
}
} else if cfg.Kes.Enabled {
kms, err = NewKes(cfg.Kes)
if err != nil {
return kms, err
}
}
if cfg.AutoEncryption && kms == nil {
return kms, errors.New("Invalid KMS configuration: auto-encryption is enabled but no valid KMS configuration is present")
}
return kms, nil
}