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01cb705c36
This commit adds support for KMS master key versions. Now, MinIO stores any key version information returned by the KMS as part of the object metadata. The key version identifies a particular master key within a master key ring. When encrypting/ generating a DEK, MinIO has to remember the key version - similar to the key name. When decrypting a DEK, MinIO sends the key version to the KMS such that the KMS can identify the exact key version that should be used to decrypt the object. Existing objects don't have a key version. Hence, this field will be empty. Signed-off-by: Andreas Auernhammer <github@aead.dev>
125 lines
3.8 KiB
Go
125 lines
3.8 KiB
Go
// Copyright (c) 2015-2021 MinIO, Inc.
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//
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// This file is part of MinIO Object Storage stack
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package kms
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import (
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"context"
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"strconv"
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"github.com/minio/madmin-go/v3"
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)
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// conn represents a connection to a KMS implementation.
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// It's implemented by the MinKMS and KES client wrappers
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// and the static / single key KMS.
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type conn interface {
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// Version returns version information about the KMS.
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//
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// TODO(aead): refactor this API call. It does not account
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// for multiple endpoints.
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Version(context.Context) (string, error)
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// APIs returns a list of APIs supported by the KMS server.
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//
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// TODO(aead): remove this API call. It's hardly useful.
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APIs(context.Context) ([]madmin.KMSAPI, error)
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// Stat returns the current KMS status.
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Status(context.Context) (map[string]madmin.ItemState, error)
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// CreateKey creates a new key at the KMS with the given key ID.
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CreateKey(context.Context, *CreateKeyRequest) error
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ListKeys(context.Context, *ListRequest) ([]madmin.KMSKeyInfo, string, error)
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// GenerateKey generates a new data encryption key using the
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// key referenced by the key ID.
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//
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// The KMS may use a default key if the key ID is empty.
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// GenerateKey returns an error if the referenced key does
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// not exist.
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//
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// The context is associated and tied to the generated DEK.
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// The same context must be provided when the generated key
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// should be decrypted. Therefore, it is the callers
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// responsibility to remember the corresponding context for
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// a particular DEK. The context may be nil.
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GenerateKey(context.Context, *GenerateKeyRequest) (DEK, error)
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// DecryptKey decrypts the ciphertext with the key referenced
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// by the key ID. The context must match the context value
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// used to generate the ciphertext.
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Decrypt(context.Context, *DecryptRequest) ([]byte, error)
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// MAC generates the checksum of the given req.Message using the key
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// with the req.Name at the KMS.
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MAC(context.Context, *MACRequest) ([]byte, error)
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}
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var ( // compiler checks
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_ conn = (*kmsConn)(nil)
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_ conn = (*kesConn)(nil)
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_ conn = secretKey{}
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)
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// Supported KMS types
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const (
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MinKMS Type = iota + 1 // MinIO KMS
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MinKES // MinIO MinKES
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Builtin // Builtin single key KMS implementation
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)
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// Type identifies the KMS type.
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type Type uint
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// String returns the Type's string representation
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func (t Type) String() string {
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switch t {
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case MinKMS:
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return "MinIO KMS"
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case MinKES:
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return "MinIO KES"
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case Builtin:
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return "MinIO builtin"
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default:
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return "!INVALID:" + strconv.Itoa(int(t))
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}
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}
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// Status describes the current state of a KMS.
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type Status struct {
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Online map[string]struct{}
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Offline map[string]Error
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}
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// DEK is a data encryption key. It consists of a
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// plaintext-ciphertext pair and the ID of the key
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// used to generate the ciphertext.
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//
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// The plaintext can be used for cryptographic
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// operations - like encrypting some data. The
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// ciphertext is the encrypted version of the
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// plaintext data and can be stored on untrusted
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// storage.
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type DEK struct {
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KeyID string // Name of the master key
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Version string // Version of the master key
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Plaintext []byte // Paintext of the data encryption key
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Ciphertext []byte // Ciphertext of the data encryption key
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}
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