/
secrets.go
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/
secrets.go
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// Copyright 2016-2019, Pulumi Corporation.
//
// 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 stack
import (
"encoding/json"
"github.com/pkg/errors"
"github.com/pulumi/pulumi/pkg/v2/secrets"
"github.com/pulumi/pulumi/pkg/v2/secrets/b64"
"github.com/pulumi/pulumi/pkg/v2/secrets/cloud"
"github.com/pulumi/pulumi/pkg/v2/secrets/passphrase"
"github.com/pulumi/pulumi/pkg/v2/secrets/service"
"github.com/pulumi/pulumi/sdk/v2/go/common/resource"
"github.com/pulumi/pulumi/sdk/v2/go/common/resource/config"
)
// DefaultSecretsProvider is the default SecretsProvider to use when deserializing deployments.
var DefaultSecretsProvider SecretsProvider = &defaultSecretsProvider{}
// SecretsProvider allows for the creation of secrets managers based on a well-known type name.
type SecretsProvider interface {
// OfType returns a secrets manager for the given type, initialized with its previous state.
OfType(ty string, state json.RawMessage) (secrets.Manager, error)
}
// defaultSecretsProvider implements the secrets.ManagerProviderFactory interface. Essentially
// it is the global location where new secrets managers can be registered for use when
// decrypting checkpoints.
type defaultSecretsProvider struct{}
// OfType returns a secrets manager for the given secrets type. Returns an error
// if the type is uknown or the state is invalid.
func (defaultSecretsProvider) OfType(ty string, state json.RawMessage) (secrets.Manager, error) {
var sm secrets.Manager
var err error
switch ty {
case b64.Type:
sm = b64.NewBase64SecretsManager()
case passphrase.Type:
sm, err = passphrase.NewPassphaseSecretsManagerFromState(state)
case service.Type:
sm, err = service.NewServiceSecretsManagerFromState(state)
case cloud.Type:
sm, err = cloud.NewCloudSecretsManagerFromState(state)
default:
return nil, errors.Errorf("no known secrets provider for type %q", ty)
}
if err != nil {
return nil, errors.Wrapf(err, "constructing secrets manager of type %q", ty)
}
return NewCachingSecretsManager(sm), nil
}
type cacheEntry struct {
plaintext string
ciphertext string
}
type cachingSecretsManager struct {
manager secrets.Manager
cache map[*resource.Secret]cacheEntry
}
// NewCachingSecretsManager returns a new secrets.Manager that caches the ciphertext for secret property values. A
// secrets.Manager that will be used to encrypt and decrypt values stored in a serialized deployment can be wrapped
// in a caching secrets manager in order to avoid re-encrypting secrets each time the deployment is serialized.
func NewCachingSecretsManager(manager secrets.Manager) secrets.Manager {
return &cachingSecretsManager{
manager: manager,
cache: make(map[*resource.Secret]cacheEntry),
}
}
func (csm *cachingSecretsManager) Type() string {
return csm.manager.Type()
}
func (csm *cachingSecretsManager) State() interface{} {
return csm.manager.State()
}
func (csm *cachingSecretsManager) Encrypter() (config.Encrypter, error) {
enc, err := csm.manager.Encrypter()
if err != nil {
return nil, err
}
return &cachingCrypter{
encrypter: enc,
cache: csm.cache,
}, nil
}
func (csm *cachingSecretsManager) Decrypter() (config.Decrypter, error) {
dec, err := csm.manager.Decrypter()
if err != nil {
return nil, err
}
return &cachingCrypter{
decrypter: dec,
cache: csm.cache,
}, nil
}
type cachingCrypter struct {
encrypter config.Encrypter
decrypter config.Decrypter
cache map[*resource.Secret]cacheEntry
}
func (c *cachingCrypter) EncryptValue(plaintext string) (string, error) {
return c.encrypter.EncryptValue(plaintext)
}
func (c *cachingCrypter) DecryptValue(ciphertext string) (string, error) {
return c.decrypter.DecryptValue(ciphertext)
}
// encryptSecret encrypts the plaintext associated with the given secret value.
func (c *cachingCrypter) encryptSecret(secret *resource.Secret, plaintext string) (string, error) {
// If the cache has an entry for this secret and the plaintext has not changed, re-use the ciphertext.
//
// Otherwise, re-encrypt the plaintext and update the cache.
entry, ok := c.cache[secret]
if ok && entry.plaintext == plaintext {
return entry.ciphertext, nil
}
ciphertext, err := c.encrypter.EncryptValue(plaintext)
if err != nil {
return "", err
}
c.insert(secret, plaintext, ciphertext)
return ciphertext, nil
}
// insert associates the given secret with the given plain- and ciphertext in the cache.
func (c *cachingCrypter) insert(secret *resource.Secret, plaintext, ciphertext string) {
c.cache[secret] = cacheEntry{plaintext, ciphertext}
}