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secret.go
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secret.go
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// Copyright © 2024 Bank-Vaults Maintainers
//
// 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 bao
import (
"context"
"encoding/base64"
"encoding/json"
"fmt"
"strings"
"emperror.dev/errors"
baoinjector "github.com/bank-vaults/internal/pkg/injector/bao"
corev1 "k8s.io/api/core/v1"
"github.com/bank-vaults/secrets-webhook/pkg/provider"
"github.com/bank-vaults/secrets-webhook/pkg/provider/common"
)
func (m *mutator) MutateSecret(ctx context.Context, mutateRequest provider.SecretMutateRequest) error {
// do an early exit if no mutation is needed
requiredToMutate, err := secretNeedsMutation(mutateRequest.Secret)
if err != nil {
return errors.Wrap(err, "failed to check if secret needs to be mutated")
}
if !requiredToMutate {
return nil
}
err = m.newClient(ctx, mutateRequest.K8sClient, mutateRequest.K8sNamespace)
if err != nil {
return err
}
defer m.client.Close()
injectorConfig := baoinjector.Config{
TransitKeyID: m.config.TransitKeyID,
TransitPath: m.config.TransitPath,
TransitBatchSize: m.config.TransitBatchSize,
}
injector := baoinjector.NewSecretInjector(injectorConfig, m.client, nil, m.logger)
if value, ok := mutateRequest.Secret.Data[corev1.DockerConfigJsonKey]; ok {
var dc common.DockerCredentials
err := json.Unmarshal(value, &dc)
if err != nil {
return errors.Wrap(err, "unmarshal dockerconfig json failed")
}
err = mutateDockerCreds(mutateRequest.Secret, &dc, &injector)
if err != nil {
return errors.Wrap(err, "mutate dockerconfig json failed")
}
}
err = mutateSecretData(mutateRequest.Secret, &injector)
if err != nil {
return errors.Wrap(err, "mutate generic secret failed")
}
return nil
}
func mutateDockerCreds(secret *corev1.Secret, dc *common.DockerCredentials, injector *baoinjector.SecretInjector) error {
assembled := common.DockerCredentials{Auths: map[string]common.DockerAuthConfig{}}
for key, creds := range dc.Auths {
authBytes, err := base64.StdEncoding.DecodeString(creds.Auth)
if err != nil {
return errors.Wrap(err, "auth base64 decoding failed")
}
auth := string(authBytes)
if isValidPrefix(auth) {
split := strings.Split(auth, ":")
if len(split) != 4 {
return errors.New("splitting auth credentials failed")
}
username := fmt.Sprintf("%s:%s", split[0], split[1])
password := fmt.Sprintf("%s:%s", split[2], split[3])
credentialData := map[string]string{
"username": username,
"password": password,
}
dcCreds, err := injector.GetDataFromBao(credentialData)
if err != nil {
return err
}
auth = fmt.Sprintf("%s:%s", dcCreds["username"], dcCreds["password"])
dockerAuth := common.DockerAuthConfig{
Auth: base64.StdEncoding.EncodeToString([]byte(auth)),
}
if creds.Username != "" && creds.Password != "" {
dockerAuth.Username = dcCreds["username"]
dockerAuth.Password = dcCreds["password"]
}
assembled.Auths[key] = dockerAuth
}
}
marshaled, err := json.Marshal(assembled)
if err != nil {
return errors.Wrap(err, "marshaling dockerconfig failed")
}
secret.Data[corev1.DockerConfigJsonKey] = marshaled
return nil
}
func mutateSecretData(secret *corev1.Secret, injector *baoinjector.SecretInjector) error {
convertedData := make(map[string]string, len(secret.Data))
for k := range secret.Data {
convertedData[k] = string(secret.Data[k])
}
convertedData, err := injector.GetDataFromBao(convertedData)
if err != nil {
return err
}
for k := range secret.Data {
secret.Data[k] = []byte(convertedData[k])
}
return nil
}
func secretNeedsMutation(secret *corev1.Secret) (bool, error) {
for key, value := range secret.Data {
if key == corev1.DockerConfigJsonKey {
var dc common.DockerCredentials
err := json.Unmarshal(value, &dc)
if err != nil {
return false, errors.Wrap(err, "unmarshal dockerconfig json failed")
}
for _, creds := range dc.Auths {
authBytes, err := base64.StdEncoding.DecodeString(creds.Auth)
if err != nil {
return false, errors.Wrap(err, "auth base64 decoding failed")
}
auth := string(authBytes)
if isValidPrefix(auth) {
return true, nil
}
}
} else if isValidPrefix(string(value)) {
return true, nil
} else if baoinjector.HasInlineBaoDelimiters(string(value)) {
return true, nil
}
}
return false, nil
}