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env_store.go
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env_store.go
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// Copyright © 2023 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 main
import (
"context"
"errors"
"fmt"
"os"
"strings"
"sync"
"github.com/bank-vaults/secret-init/pkg/common"
"github.com/bank-vaults/secret-init/pkg/provider"
"github.com/bank-vaults/secret-init/pkg/provider/aws"
"github.com/bank-vaults/secret-init/pkg/provider/azure"
"github.com/bank-vaults/secret-init/pkg/provider/bao"
"github.com/bank-vaults/secret-init/pkg/provider/file"
"github.com/bank-vaults/secret-init/pkg/provider/gcp"
"github.com/bank-vaults/secret-init/pkg/provider/vault"
)
var supportedProviders = []string{
file.ProviderName,
vault.ProviderName,
bao.ProviderName,
aws.ProviderName,
gcp.ProviderName,
azure.ProviderName,
}
// EnvStore is a helper for managing interactions between environment variables and providers,
// including tasks like extracting and converting provider-specific paths and secrets.
type EnvStore struct {
data map[string]string
appConfig *common.Config
}
func NewEnvStore(appConfig *common.Config) *EnvStore {
environ := make(map[string]string, len(os.Environ()))
for _, env := range os.Environ() {
split := strings.SplitN(env, "=", 2)
name := split[0]
value := split[1]
environ[name] = value
}
return &EnvStore{
data: environ,
appConfig: appConfig,
}
}
// GetSecretReferences returns a map of secret key=value pairs for each provider
func (s *EnvStore) GetSecretReferences() map[string][]string {
secretReferences := make(map[string][]string)
for envKey, envPath := range s.data {
providerName, envSecretReference := getProviderPath(envPath)
envSecretReference = envKey + "=" + envSecretReference
switch providerName {
case file.ProviderName:
secretReferences[file.ProviderName] = append(secretReferences[file.ProviderName], envSecretReference)
case vault.ProviderName:
secretReferences[vault.ProviderName] = append(secretReferences[vault.ProviderName], envSecretReference)
case bao.ProviderName:
secretReferences[bao.ProviderName] = append(secretReferences[bao.ProviderName], envSecretReference)
case aws.ProviderName:
secretReferences[aws.ProviderName] = append(secretReferences[aws.ProviderName], envSecretReference)
case gcp.ProviderName:
secretReferences[gcp.ProviderName] = append(secretReferences[gcp.ProviderName], envSecretReference)
case azure.ProviderName:
secretReferences[azure.ProviderName] = append(secretReferences[azure.ProviderName], envSecretReference)
}
}
return secretReferences
}
// LoadProviderSecrets creates a new provider for each detected provider using a specified config.
// It then asynchronously loads secrets using each provider and it's corresponding paths.
// The secrets from each provider are then placed into a single slice.
func (s *EnvStore) LoadProviderSecrets(ctx context.Context, providerPaths map[string][]string) ([]provider.Secret, error) {
// At most, we will have one error per provider
errCh := make(chan error, len(supportedProviders))
var providerSecrets []provider.Secret
// Workaround for openBao
// Remove once openBao uses BAO_ADDR in their client, instead of VAULT_ADDR
vaultPaths, ok := providerPaths[vault.ProviderName]
if ok {
var err error
providerSecrets, err = s.workaroundForBao(ctx, vaultPaths)
if err != nil {
return nil, fmt.Errorf("failed to workaround for bao: %w", err)
}
// Remove the vault paths since they have been processed
delete(providerPaths, vault.ProviderName)
}
var wg sync.WaitGroup
var mu sync.Mutex
for providerName, paths := range providerPaths {
wg.Add(1)
go func(providerName string, paths []string, errCh chan<- error) {
defer wg.Done()
provider, err := newProvider(ctx, providerName, s.appConfig)
if err != nil {
errCh <- fmt.Errorf("failed to create provider %s: %w", providerName, err)
return
}
secrets, err := provider.LoadSecrets(ctx, paths)
if err != nil {
errCh <- fmt.Errorf("failed to load secrets for provider %s: %w", providerName, err)
return
}
mu.Lock()
providerSecrets = append(providerSecrets, secrets...)
mu.Unlock()
}(providerName, paths, errCh)
}
// Wait for all providers to finish
wg.Wait()
close(errCh)
// Check for errors
var errs error
for e := range errCh {
if e != nil {
errs = errors.Join(errs, e)
}
}
if errs != nil {
return nil, errs
}
return providerSecrets, nil
}
// Workaround for openBao, essentially loading secretes from Vault first.
func (s *EnvStore) workaroundForBao(ctx context.Context, vaultPaths []string) ([]provider.Secret, error) {
var secrets []provider.Secret
provider, err := newProvider(ctx, vault.ProviderName, s.appConfig)
if err != nil {
return nil, fmt.Errorf("failed to create provider %s: %w", vault.ProviderName, err)
}
secrets, err = provider.LoadSecrets(ctx, vaultPaths)
if err != nil {
return nil, fmt.Errorf("failed to load secrets for provider %s: %w", vault.ProviderName, err)
}
return secrets, nil
}
// ConvertProviderSecrets converts the loaded secrets to environment variables
func (s *EnvStore) ConvertProviderSecrets(providerSecrets []provider.Secret) ([]string, error) {
var secretsEnv []string
for _, secret := range providerSecrets {
secretsEnv = append(secretsEnv, fmt.Sprintf("%s=%s", secret.Key, secret.Value))
}
return secretsEnv, nil
}
// Returns the detected provider name and path with removed prefix
func getProviderPath(path string) (string, string) {
if strings.HasPrefix(path, "file:") {
return file.ProviderName, path
}
// If the path contains some string formatted as "vault:{STR}#{STR}"
// it is most probably a vault path
if vault.ProviderEnvRegex.MatchString(path) {
return vault.ProviderName, path
}
// If the path contains some string formatted as "bao:{STR}#{STR}"
// it is most probably a vault path
if bao.ProviderEnvRegex.MatchString(path) {
return bao.ProviderName, path
}
// Example AWS prefixes:
// arn:aws:secretsmanager:us-west-2:123456789012:secret:my-secret
// arn:aws:ssm:us-west-2:123456789012:parameter/my-parameter
if strings.HasPrefix(path, "arn:aws:secretsmanager:") || strings.HasPrefix(path, "arn:aws:ssm:") {
return aws.ProviderName, path
}
// Example GCP prefixes:
// gcp:secretmanager:projects/{PROJECT_ID}/secrets/{SECRET_NAME}
// gcp:secretmanager:projects/{PROJECT_ID}/secrets/{SECRET_NAME}/versions/{VERSION|latest}
if strings.HasPrefix(path, "gcp:secretmanager:") {
return gcp.ProviderName, path
}
// Example Azure Key Vault secret examples:
// azure:keyvault:{SECRET_NAME}
// azure:keyvault:{SECRET_NAME}/{VERSION}
if strings.HasPrefix(path, "azure:keyvault:") {
return azure.ProviderName, path
}
return "", path
}
func newProvider(ctx context.Context, providerName string, appConfig *common.Config) (provider.Provider, error) {
switch providerName {
case file.ProviderName:
config := file.LoadConfig()
provider, err := file.NewProvider(config)
if err != nil {
return nil, fmt.Errorf("failed to create file provider: %w", err)
}
return provider, nil
case vault.ProviderName:
config, err := vault.LoadConfig()
if err != nil {
return nil, fmt.Errorf("failed to create vault config: %w", err)
}
provider, err := vault.NewProvider(config, appConfig)
if err != nil {
return nil, fmt.Errorf("failed to create vault provider: %w", err)
}
return provider, nil
case bao.ProviderName:
config, err := bao.LoadConfig()
if err != nil {
return nil, fmt.Errorf("failed to create bao config: %w", err)
}
provider, err := bao.NewProvider(config, appConfig)
if err != nil {
return nil, fmt.Errorf("failed to create bao provider: %w", err)
}
return provider, nil
case aws.ProviderName:
config, err := aws.LoadConfig()
if err != nil {
return nil, fmt.Errorf("failed to create aws config: %w", err)
}
provider := aws.NewProvider(config)
return provider, nil
case gcp.ProviderName:
provider, err := gcp.NewProvider(ctx)
if err != nil {
return nil, fmt.Errorf("failed to create gcp provider: %w", err)
}
return provider, nil
case azure.ProviderName:
config, err := azure.LoadConfig()
if err != nil {
return nil, fmt.Errorf("failed to create azure config: %w", err)
}
provider, err := azure.NewProvider(config)
if err != nil {
return nil, fmt.Errorf("failed to create azure provider: %w", err)
}
return provider, nil
default:
return nil, fmt.Errorf("provider %s is not supported", providerName)
}
}