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secret_agent.go
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secret_agent.go
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// Copyright 2024 Aerospike, Inc.
//
// 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 backup
import (
"crypto/tls"
"crypto/x509"
"fmt"
"os"
"strings"
"time"
saClient "github.com/aerospike/backup-go/pkg/secret-agent"
)
const secretPrefix = "secrets:"
func getSecret(config *SecretAgentConfig, key string) (string, error) {
if config == nil {
return "", fmt.Errorf("secret config not initialized")
}
// Getting resource and key.
resource, secretKey, err := getResourceKey(key)
if err != nil {
return "", err
}
// Getting tls config.
tlsConfig, err := getTlSConfig(config.CaFile)
if err != nil {
return "", err
}
// Parsing config values.
address := *config.Address
if config.Port != nil {
address = fmt.Sprintf("%s:%d", *config.Address, *config.Port)
}
// Parsing timeout, if it is a nil, by default we set 1000 Millisecond
timeout := 1000 * time.Millisecond
if config.TimeoutMillisecond != nil {
timeout = time.Duration(*config.TimeoutMillisecond) * time.Millisecond
}
// Parsing isBase64 param.
var isBase64 bool
if config.IsBase64 != nil {
isBase64 = *config.IsBase64
}
// Initializing client.
client, err := saClient.NewClient(
*config.ConnectionType,
address,
timeout,
isBase64,
tlsConfig,
)
if err != nil {
return "", fmt.Errorf("failed to initialize secret agent client: %w", err)
}
result, err := client.GetSecret(resource, secretKey)
if err != nil {
return "", fmt.Errorf("failed to get secret from secret agent: %w", err)
}
return result, nil
}
func getResourceKey(key string) (resource, secretKey string, err error) {
if !isSecret(key) {
return "", "",
fmt.Errorf("invalid secret key format, must be secrets:<resource>:<secret>")
}
keyArr := strings.Split(key, ":")
if len(keyArr) != 3 {
return "", "", fmt.Errorf("invalid secret key format")
}
// We believe that keyArr[0] == secretPrefix
return keyArr[1], keyArr[2], nil
}
// getTlSConfig returns *tls.Config if caFile is set, or nil if caFile is not set.
func getTlSConfig(caFile *string) (*tls.Config, error) {
if caFile == nil {
return nil, nil
}
caCert, err := os.ReadFile(*caFile)
if err != nil {
return nil, fmt.Errorf("unable to read ca file: %w", err)
}
caCertPool := x509.NewCertPool()
ok := caCertPool.AppendCertsFromPEM(caCert)
if !ok {
return nil, fmt.Errorf("nothing to append to ca cert pool")
}
//nolint:gosec // we must support any tls configuration for legacy.
tlsConfig := &tls.Config{
RootCAs: caCertPool,
}
return tlsConfig, nil
}
// isSecret checks if string is secret. e.g.: secrets:resource2:cacert
func isSecret(secret string) bool {
return strings.HasPrefix(secret, secretPrefix)
}