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Copy pathenvironment.go
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182 lines (161 loc) · 6.86 KB
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// Minio Cloud Storage, (C) 2016, 2017, 2018 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 cmd
import (
"encoding/hex"
"errors"
"fmt"
"os"
"strconv"
"strings"
"github.com/minio/minio/cmd/crypto"
)
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_SSE_MASTER_KEY"
// EnvAutoEncryption 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".
EnvAutoEncryption = "MINIO_SSE_AUTO_ENCRYPTION"
)
const (
// EnvVaultEndpoint is the environment variable used to specify
// the vault HTTPS endpoint.
EnvVaultEndpoint = "MINIO_SSE_VAULT_ENDPOINT"
// EnvVaultAuthType is the environment variable used to specify
// the authentication type for vault.
EnvVaultAuthType = "MINIO_SSE_VAULT_AUTH_TYPE"
// EnvVaultAppRoleID is the environment variable used to specify
// the vault AppRole ID.
EnvVaultAppRoleID = "MINIO_SSE_VAULT_APPROLE_ID"
// EnvVaultAppSecretID is the environment variable used to specify
// the vault AppRole secret corresponding to the AppRole ID.
EnvVaultAppSecretID = "MINIO_SSE_VAULT_APPROLE_SECRET"
// EnvVaultKeyVersion is the environment variable used to specify
// the vault key version.
EnvVaultKeyVersion = "MINIO_SSE_VAULT_KEY_VERSION"
// EnvVaultKeyName 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).
EnvVaultKeyName = "MINIO_SSE_VAULT_KEY_NAME"
// EnvVaultCAPath 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.
EnvVaultCAPath = "MINIO_SSE_VAULT_CAPATH"
// EnvVaultNamespace is the environment variable used to specify
// vault namespace. The vault namespace is used if the enterprise
// version of Hashicorp Vault is used.
EnvVaultNamespace = "MINIO_SSE_VAULT_NAMESPACE"
)
// Environment provides functions for accessing environment
// variables.
var Environment = environment{}
type environment struct{}
// Get retrieves the value of the environment variable named
// by the key. If the variable is present in the environment the
// value (which may be empty) is returned. Otherwise it returns
// the specified default value.
func (environment) Get(key, defaultValue string) string {
if v, ok := os.LookupEnv(key); ok {
return v
}
return defaultValue
}
// Lookup retrieves the value of the environment variable named
// by the key. If the variable is present in the environment the
// value (which may be empty) is returned and the boolean is true.
// Otherwise the returned value will be empty and the boolean will
// be false.
func (environment) Lookup(key string) (string, bool) { return os.LookupEnv(key) }
// LookupKMSConfig 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 success.
func (env environment) LookupKMSConfig(config crypto.KMSConfig) (err error) {
// Lookup Hashicorp-Vault configuration & overwrite config entry if ENV var is present
config.Vault.Endpoint = env.Get(EnvVaultEndpoint, config.Vault.Endpoint)
config.Vault.CAPath = env.Get(EnvVaultCAPath, config.Vault.CAPath)
config.Vault.Auth.Type = env.Get(EnvVaultAuthType, config.Vault.Auth.Type)
config.Vault.Auth.AppRole.ID = env.Get(EnvVaultAppRoleID, config.Vault.Auth.AppRole.ID)
config.Vault.Auth.AppRole.Secret = env.Get(EnvVaultAppSecretID, config.Vault.Auth.AppRole.Secret)
config.Vault.Key.Name = env.Get(EnvVaultKeyName, config.Vault.Key.Name)
config.Vault.Namespace = env.Get(EnvVaultNamespace, config.Vault.Namespace)
keyVersion := env.Get(EnvVaultKeyVersion, strconv.Itoa(config.Vault.Key.Version))
config.Vault.Key.Version, err = strconv.Atoi(keyVersion)
if err != nil {
return fmt.Errorf("Invalid ENV variable: Unable to parse %s value (`%s`)", EnvVaultKeyVersion, keyVersion)
}
if err = config.Vault.Verify(); err != nil {
return err
}
// Lookup KMS master keys - only available through ENV.
if masterKey, ok := env.Lookup(EnvKMSMasterKey); ok {
if !config.Vault.IsEmpty() { // Vault and KMS master key provided
return errors.New("Ambiguous KMS configuration: vault configuration and a master key are provided at the same time")
}
globalKMSKeyID, GlobalKMS, err = parseKMSMasterKey(masterKey)
if err != nil {
return err
}
}
if !config.Vault.IsEmpty() {
GlobalKMS, err = crypto.NewVault(config.Vault)
if err != nil {
return err
}
globalKMSKeyID = config.Vault.Key.Name
}
autoEncryption, err := ParseBoolFlag(env.Get(EnvAutoEncryption, "off"))
if err != nil {
return err
}
globalAutoEncryption = bool(autoEncryption)
if globalAutoEncryption && GlobalKMS == nil { // auto-encryption enabled but no KMS
return errors.New("Invalid KMS configuration: auto-encryption is enabled but no valid KMS configuration is present")
}
return nil
}
// parseKMSMasterKey parses the value of the environment variable
// `EnvKMSMasterKey` and returns a key-ID and a master-key KMS on success.
func parseKMSMasterKey(envArg string) (string, crypto.KMS, error) {
values := strings.SplitN(envArg, ":", 2)
if len(values) != 2 {
return "", nil, fmt.Errorf("Invalid KMS master key: %s does not contain a ':'", envArg)
}
var (
keyID = values[0]
hexKey = values[1]
)
if len(hexKey) != 64 { // 2 hex bytes = 1 byte
return "", nil, fmt.Errorf("Invalid KMS master key: %s not a 32 bytes long HEX value", hexKey)
}
var masterKey [32]byte
if _, err := hex.Decode(masterKey[:], []byte(hexKey)); err != nil {
return "", nil, fmt.Errorf("Invalid KMS master key: %s not a 32 bytes long HEX value", hexKey)
}
return keyID, crypto.NewKMS(masterKey), nil
}