mirror of
https://github.com/woodpecker-ci/woodpecker.git
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108 lines
3.1 KiB
Go
108 lines
3.1 KiB
Go
// Copyright 2023 Woodpecker Authors
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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 encryption
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import (
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"crypto/aes"
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"crypto/cipher"
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"crypto/sha3"
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"encoding/hex"
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"errors"
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"fmt"
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"go.woodpecker-ci.org/woodpecker/v3/server/store/types"
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)
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func (svc *aesEncryptionService) loadCipher(password string) error {
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key, err := svc.hash([]byte(password))
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if err != nil {
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return fmt.Errorf(errTemplateAesFailedGeneratingKey, err)
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}
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keyID, err := svc.deriveKeyID(key)
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if err != nil {
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return fmt.Errorf(errTemplateAesFailedGeneratingKeyID, err)
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}
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svc.keyID = keyID
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block, err := aes.NewCipher(key)
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if err != nil {
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return fmt.Errorf(errTemplateAesFailedLoadingCipher, err)
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}
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aead, err := cipher.NewGCM(block)
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if err != nil {
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return fmt.Errorf(errTemplateAesFailedLoadingCipher, err)
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}
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svc.cipher = aead
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return nil
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}
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func (svc *aesEncryptionService) validateKey() error {
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ciphertextSample, err := svc.store.ServerConfigGet(ciphertextSampleConfigKey)
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if errors.Is(err, types.ErrRecordNotExist) {
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return errEncryptionNotEnabled
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} else if err != nil {
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return fmt.Errorf(errTemplateFailedLoadingServerConfig, err)
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}
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plaintext, err := svc.Decrypt(ciphertextSample, keyIDAssociatedData)
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if err != nil {
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return errEncryptionKeyInvalid
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}
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if plaintext != svc.keyID {
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return errEncryptionKeyInvalid
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}
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return nil
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}
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// deriveKeyID derives a deterministic, non-reversible identifier for the
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// encryption key. Domain separation ensures the id differs from the key
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// derivation of the password, so storing it (encrypted) leaks nothing about
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// the key itself. It must be deterministic: it is compared against the
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// sample stored in the database to validate the key across server restarts.
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func (svc *aesEncryptionService) deriveKeyID(key []byte) (string, error) {
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result := make([]byte, 32)
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sha := sha3.NewSHAKE256()
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_, err := sha.Write([]byte(keyIDDomainSeparation))
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if err != nil {
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return "", fmt.Errorf(errTemplateAesFailedCalculatingHash, err)
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}
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_, err = sha.Write(key)
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if err != nil {
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return "", fmt.Errorf(errTemplateAesFailedCalculatingHash, err)
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}
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_, err = sha.Read(result)
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if err != nil {
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return "", fmt.Errorf(errTemplateAesFailedCalculatingHash, err)
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}
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return hex.EncodeToString(result), nil
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}
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func (svc *aesEncryptionService) hash(data []byte) ([]byte, error) {
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result := make([]byte, 32)
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sha := sha3.NewSHAKE256()
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_, err := sha.Write(data)
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if err != nil {
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return nil, fmt.Errorf(errTemplateAesFailedCalculatingHash, err)
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}
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_, err = sha.Read(result)
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if err != nil {
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return nil, fmt.Errorf(errTemplateAesFailedCalculatingHash, err)
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}
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return result, nil
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}
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