1f262daf6f
This is to ensure that there are no projects that try to import `minio/minio/pkg` into their own repo. Any such common packages should go to `https://github.com/minio/pkg`
143 lines
4.1 KiB
Go
143 lines
4.1 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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"crypto/tls"
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"crypto/x509"
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"errors"
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"time"
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"github.com/minio/kes"
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)
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// Config contains various KMS-related configuration
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// parameters - like KMS endpoints or authentication
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// credentials.
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type Config struct {
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// Endpoints contains a list of KMS server
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// HTTP endpoints.
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Endpoints []string
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// DefaultKeyID is the key ID used when
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// no explicit key ID is specified for
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// a cryptographic operation.
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DefaultKeyID string
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// Certificate is the client TLS certificate
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// to authenticate to KMS via mTLS.
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Certificate tls.Certificate
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// RootCAs is a set of root CA certificates
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// to verify the KMS server TLS certificate.
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RootCAs *x509.CertPool
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}
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// NewWithConfig returns a new KMS using the given
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// configuration.
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func NewWithConfig(config Config) (KMS, error) {
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if len(config.Endpoints) == 0 {
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return nil, errors.New("kms: no server endpoints")
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}
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var endpoints = make([]string, len(config.Endpoints)) // Copy => avoid being affect by any changes to the original slice
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copy(endpoints, config.Endpoints)
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client := kes.NewClientWithConfig("", &tls.Config{
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MinVersion: tls.VersionTLS12,
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Certificates: []tls.Certificate{config.Certificate},
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RootCAs: config.RootCAs,
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})
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client.Endpoints = endpoints
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return &kesClient{
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client: client,
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defaultKeyID: config.DefaultKeyID,
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}, nil
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}
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type kesClient struct {
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defaultKeyID string
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client *kes.Client
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}
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var _ KMS = (*kesClient)(nil) // compiler check
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// Stat returns the current KES status containing a
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// list of KES endpoints and the default key ID.
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func (c *kesClient) Stat() (Status, error) {
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ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
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defer cancel()
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if _, err := c.client.Version(ctx); err != nil {
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return Status{}, err
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}
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var endpoints = make([]string, len(c.client.Endpoints))
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copy(endpoints, c.client.Endpoints)
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return Status{
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Name: "KES",
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Endpoints: endpoints,
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DefaultKey: c.defaultKeyID,
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}, nil
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}
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// CreateKey tries to create a new key at the KMS with the
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// given key ID.
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//
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// If the a key with the same keyID already exists then
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// CreateKey returns kes.ErrKeyExists.
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func (c *kesClient) CreateKey(keyID string) error {
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return c.client.CreateKey(context.Background(), keyID)
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}
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// GenerateKey generates a new data encryption key using
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// the key at the KES server referenced by the key ID.
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//
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// The default key ID will be used if keyID is empty.
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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
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// key should be decrypted.
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func (c *kesClient) GenerateKey(keyID string, ctx Context) (DEK, error) {
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if keyID == "" {
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keyID = c.defaultKeyID
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}
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ctxBytes, err := ctx.MarshalText()
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if err != nil {
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return DEK{}, err
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}
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dek, err := c.client.GenerateKey(context.Background(), keyID, ctxBytes)
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if err != nil {
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return DEK{}, err
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}
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return DEK{
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KeyID: keyID,
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Plaintext: dek.Plaintext,
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Ciphertext: dek.Ciphertext,
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}, nil
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}
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// DecryptKey decrypts the ciphertext with the key at the KES
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// server referenced by the key ID. The context must match the
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// context value used to generate the ciphertext.
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func (c *kesClient) DecryptKey(keyID string, ciphertext []byte, ctx Context) ([]byte, error) {
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ctxBytes, err := ctx.MarshalText()
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if err != nil {
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return nil, err
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}
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return c.client.Decrypt(context.Background(), keyID, ciphertext, ctxBytes)
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}
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