/
service.go
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/
service.go
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// Licensed to Elasticsearch B.V. under one or more contributor
// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you 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 cubbyhole
import (
"context"
"encoding/base64"
"fmt"
"io"
"github.com/golang/snappy"
"github.com/hashicorp/vault/api"
"github.com/elastic/harp/pkg/vault/logical"
vpath "github.com/elastic/harp/pkg/vault/path"
)
type service struct {
logical logical.Logical
mountPath string
}
// New instantiates a Vault cubbyhole backend service.
func New(client *api.Client, mountPath string) (Service, error) {
// Apply default cubbyhole mountpath if not overrided.
if mountPath == "" {
mountPath = "cubbyhole"
}
return &service{
logical: client.Logical(),
mountPath: vpath.SanitizePath(mountPath),
}, nil
}
// -----------------------------------------------------------------------------
const (
secretSizeLimit = 1024 * 1024 * 1024 // 1Mb
)
// Put a secret in cubbyhole to retrieve a wrapping token.
//
//nolint:interfacer // -- wants to replace time.Duration by fmt.Stringer
func (s *service) Put(_ context.Context, r io.Reader) (string, error) {
// Encode secret
payload, err := io.ReadAll(io.LimitReader(r, secretSizeLimit))
if err != nil {
return "", fmt.Errorf("unable to drain secret reader: %w", err)
}
// Compress and encode
final := base64.StdEncoding.EncodeToString(snappy.Encode(nil, payload))
// Add to cubbyhole
return addToCubbyhole(s.logical, s.mountPath, final)
}
// Get a secret from wrapping token.
func (s *service) Get(_ context.Context, token string, w io.Writer) error {
// Unwrap token
encoded, err := unWrap(s.logical, token)
if err != nil {
return err
}
// Decode
payload, err := base64.StdEncoding.DecodeString(encoded)
if err != nil {
return fmt.Errorf("invalid secret payload: %w", err)
}
// Decompress
final, err := snappy.Decode(nil, payload)
if err != nil {
return fmt.Errorf("invalid secret payload: %w", err)
}
// Return result to writer
_, err = w.Write(final)
if err != nil {
return fmt.Errorf("unable to write result to the writer: %w", err)
}
// No error
return nil
}