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/*
* MinIO Cloud Storage, (C) 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 (
"reflect"
"strconv"
"github.com/minio/minio/cmd/config"
"github.com/minio/minio/pkg/env"
xnet "github.com/minio/minio/pkg/net"
)
const (
// EnvKMSMasterKeyLegacy 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".
EnvKMSMasterKeyLegacy = "MINIO_SSE_MASTER_KEY"
// EnvAutoEncryptionLegacy 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".
EnvAutoEncryptionLegacy = "MINIO_SSE_AUTO_ENCRYPTION"
)
const (
// EnvLegacyVaultEndpoint is the environment variable used to specify
// the vault HTTPS endpoint.
EnvLegacyVaultEndpoint = "MINIO_SSE_VAULT_ENDPOINT"
// EnvLegacyVaultAuthType is the environment variable used to specify
// the authentication type for vault.
EnvLegacyVaultAuthType = "MINIO_SSE_VAULT_AUTH_TYPE"
// EnvLegacyVaultAppRoleID is the environment variable used to specify
// the vault AppRole ID.
EnvLegacyVaultAppRoleID = "MINIO_SSE_VAULT_APPROLE_ID"
// EnvLegacyVaultAppSecretID is the environment variable used to specify
// the vault AppRole secret corresponding to the AppRole ID.
EnvLegacyVaultAppSecretID = "MINIO_SSE_VAULT_APPROLE_SECRET"
// EnvLegacyVaultKeyVersion is the environment variable used to specify
// the vault key version.
EnvLegacyVaultKeyVersion = "MINIO_SSE_VAULT_KEY_VERSION"
// EnvLegacyVaultKeyName 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).
EnvLegacyVaultKeyName = "MINIO_SSE_VAULT_KEY_NAME"
// EnvLegacyVaultCAPath 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.
EnvLegacyVaultCAPath = "MINIO_SSE_VAULT_CAPATH"
// EnvLegacyVaultNamespace is the environment variable used to specify
// vault namespace. The vault namespace is used if the enterprise
// version of Hashicorp Vault is used.
EnvLegacyVaultNamespace = "MINIO_SSE_VAULT_NAMESPACE"
)
// SetKMSConfig helper to migrate from older KMSConfig to new KV.
func SetKMSConfig(s config.Config, cfg KMSConfig) {
if cfg.Vault.Endpoint == "" {
return
}
s[config.KmsVaultSubSys][config.Default] = config.KVS{
config.KV{
Key: KMSVaultEndpoint,
Value: cfg.Vault.Endpoint,
},
config.KV{
Key: KMSVaultCAPath,
Value: cfg.Vault.CAPath,
},
config.KV{
Key: KMSVaultAuthType,
Value: func() string {
if cfg.Vault.Auth.Type != "" {
return cfg.Vault.Auth.Type
}
return "approle"
}(),
},
config.KV{
Key: KMSVaultAppRoleID,
Value: cfg.Vault.Auth.AppRole.ID,
},
config.KV{
Key: KMSVaultAppRoleSecret,
Value: cfg.Vault.Auth.AppRole.Secret,
},
config.KV{
Key: KMSVaultKeyName,
Value: cfg.Vault.Key.Name,
},
config.KV{
Key: KMSVaultKeyVersion,
Value: strconv.Itoa(cfg.Vault.Key.Version),
},
config.KV{
Key: KMSVaultNamespace,
Value: cfg.Vault.Namespace,
},
}
}
// lookupConfigLegacy extracts the KMS configuration provided by legacy
// environment variables and merge them with the provided KMS configuration.
// The merging follows the following rules:
//
// 1. A valid value provided as environment variable has higher priority
// 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 success.
func lookupConfigLegacy(kvs config.KVS) (VaultConfig, error) {
vcfg := VaultConfig{
Auth: VaultAuth{
Type: "approle",
},
}
endpointStr := env.Get(EnvLegacyVaultEndpoint, "")
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()
}
var err error
vcfg.Endpoint = endpointStr
vcfg.CAPath = env.Get(EnvLegacyVaultCAPath, "")
vcfg.Auth.Type = env.Get(EnvLegacyVaultAuthType, "")
if vcfg.Auth.Type == "" {
vcfg.Auth.Type = "approle"
}
vcfg.Auth.AppRole.ID = env.Get(EnvLegacyVaultAppRoleID, "")
vcfg.Auth.AppRole.Secret = env.Get(EnvLegacyVaultAppSecretID, "")
vcfg.Key.Name = env.Get(EnvLegacyVaultKeyName, "")
vcfg.Namespace = env.Get(EnvLegacyVaultNamespace, "")
if keyVersion := env.Get(EnvLegacyVaultKeyVersion, ""); keyVersion != "" {
vcfg.Key.Version, err = strconv.Atoi(keyVersion)
if err != nil {
return vcfg, Errorf("Invalid ENV variable: Unable to parse %s value (`%s`)",
EnvLegacyVaultKeyVersion, keyVersion)
}
}
if reflect.DeepEqual(vcfg, defaultVaultCfg) {
return vcfg, nil
}
if err = vcfg.Verify(); err != nil {
return vcfg, err
}
vcfg.Enabled = true
return vcfg, nil
}