120 lines
2.9 KiB
Go
120 lines
2.9 KiB
Go
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// Copyright 2019 Drone IO, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package secret
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import (
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"context"
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"crypto/aes"
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"crypto/cipher"
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"encoding/base64"
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"errors"
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"github.com/drone/drone-yaml/yaml"
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"github.com/drone/drone/core"
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"github.com/drone/drone/logger"
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)
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// Encrypted returns a new encrypted Secret controller.
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func Encrypted() core.SecretService {
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return new(encrypted)
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}
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type encrypted struct {
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}
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func (c *encrypted) Find(ctx context.Context, in *core.SecretArgs) (*core.Secret, error) {
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logger := logger.FromContext(ctx).
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WithField("name", in.Name).
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WithField("kind", "secret")
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// lookup the named secret in the manifest. If the
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// secret does not exist, return a nil variable,
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// allowing the next secret controller in the chain
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// to be invoked.
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data, ok := getEncrypted(in.Conf, in.Name)
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if !ok {
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logger.Trace("secret: encrypted: no matching secret")
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return nil, nil
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}
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// if the build event is a pull request and the source
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// repository is a fork, the secret is not exposed to
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// the pipeline, for security reasons.
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if in.Repo.Private &&
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in.Build.Event == core.EventPullRequest &&
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in.Build.Fork != "" {
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logger.Trace("secret: encrypted: restricted from forks")
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return nil, nil
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}
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decoded, err := base64.StdEncoding.DecodeString(string(data))
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if err != nil {
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logger.WithError(err).Trace("secret: encrypted: cannot decode")
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return nil, err
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}
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decrypted, err := decrypt(decoded, []byte(in.Repo.Secret))
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if err != nil {
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logger.WithError(err).Trace("secret: encrypted: cannot decrypt")
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return nil, err
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}
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logger.Trace("secret: encrypted: found matching secret")
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return &core.Secret{
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Name: in.Name,
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Data: string(decrypted),
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}, nil
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}
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func getEncrypted(manifest *yaml.Manifest, match string) (data string, ok bool) {
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for _, resource := range manifest.Resources {
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secret, ok := resource.(*yaml.Secret)
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if !ok {
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continue
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}
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if secret.Name != match {
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continue
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}
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if secret.Data == "" {
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continue
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}
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return secret.Data, true
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}
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return
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}
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func decrypt(ciphertext []byte, key []byte) (plaintext []byte, err error) {
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block, err := aes.NewCipher(key[:])
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if err != nil {
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return nil, err
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}
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gcm, err := cipher.NewGCM(block)
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if err != nil {
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return nil, err
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}
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if len(ciphertext) < gcm.NonceSize() {
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return nil, errors.New("malformed ciphertext")
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}
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return gcm.Open(nil,
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ciphertext[:gcm.NonceSize()],
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ciphertext[gcm.NonceSize():],
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nil,
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)
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}
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