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minio/cmd/crypto/config.go

221 lines
7.3 KiB

// 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"
"fmt"
"strconv"
"github.com/minio/minio/cmd/config"
"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"`
}
// 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"
)
// DefaultKVS - default KV crypto config
var (
DefaultKVS = config.KVS{
config.State: config.StateOff,
config.Comment: "This is a default Vault configuration",
KMSVaultEndpoint: "",
KMSVaultCAPath: "",
KMSVaultKeyName: "",
KMSVaultKeyVersion: "",
KMSVaultNamespace: "",
KMSVaultAuthType: "approle",
KMSVaultAppRoleID: "",
KMSVaultAppRoleSecret: "",
}
)
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 (
// EnvKMSVaultState to enable on/off
EnvKMSVaultState = "MINIO_KMS_VAULT_STATE"
// 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"
)
// LookupConfig 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 LookupConfig(kvs config.KVS) (KMSConfig, error) {
if err := config.CheckValidKeys(config.KmsVaultSubSys, kvs, DefaultKVS); err != nil {
return KMSConfig{}, err
}
kmsCfg, err := lookupConfigLegacy(kvs)
if err != nil {
return kmsCfg, err
}
if !kmsCfg.AutoEncryption {
kmsCfg.AutoEncryption, err = config.ParseBool(env.Get(EnvKMSAutoEncryption, config.StateOff))
if err != nil {
return kmsCfg, err
}
}
if !kmsCfg.Vault.IsEmpty() {
return kmsCfg, nil
}
stateBool, err := config.ParseBool(env.Get(EnvKMSVaultState, kvs.Get(config.State)))
if err != nil {
return kmsCfg, err
}
if !stateBool {
return kmsCfg, 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 kmsCfg, err
}
endpointStr = endpoint.String()
}
vcfg.Endpoint = endpointStr
vcfg.CAPath = env.Get(EnvKMSVaultCAPath, kvs.Get(KMSVaultCAPath))
vcfg.Auth.Type = env.Get(EnvKMSVaultAuthType, kvs.Get(KMSVaultAuthType))
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))
keyVersion := env.Get(EnvKMSVaultKeyVersion, kvs.Get(KMSVaultKeyVersion))
if keyVersion != "" {
vcfg.Key.Version, err = strconv.Atoi(keyVersion)
if err != nil {
return kmsCfg, fmt.Errorf("Unable to parse VaultKeyVersion value (`%s`)", keyVersion)
}
}
if err = vcfg.Verify(); err != nil {
return kmsCfg, err
}
kmsCfg.Vault = vcfg
return kmsCfg, nil
}
// NewKMS - initialize a new KMS.
func NewKMS(cfg KMSConfig) (kms KMS, err error) {
// Lookup KMS master keys - only available through ENV.
if masterKeyLegacy := env.Get(EnvKMSMasterKeyLegacy, ""); len(masterKeyLegacy) != 0 {
if !cfg.Vault.IsEmpty() { // 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")
}
kms, err = ParseMasterKey(masterKeyLegacy)
if err != nil {
return kms, err
}
} else if masterKey := env.Get(EnvKMSMasterKey, ""); len(masterKey) != 0 {
if !cfg.Vault.IsEmpty() { // 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")
}
kms, err = ParseMasterKey(masterKey)
if err != nil {
return kms, err
}
}
if !cfg.Vault.IsEmpty() {
kms, err = NewVault(cfg.Vault)
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
}