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awssecretsmanager.go
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awssecretsmanager.go
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package cryptoengines
import (
"context"
"crypto"
"crypto/ecdsa"
"crypto/elliptic"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/base64"
"encoding/json"
"encoding/pem"
"fmt"
"net/http"
"github.com/aws/aws-sdk-go-v2/aws"
"github.com/aws/aws-sdk-go-v2/service/secretsmanager"
"github.com/lamassuiot/lamassuiot/v2/pkg/helpers"
"github.com/lamassuiot/lamassuiot/v2/pkg/models"
"github.com/sirupsen/logrus"
)
var lAWSSM *logrus.Entry
type AWSSecretsManagerCryptoEngine struct {
config models.CryptoEngineInfo
smngerCli *secretsmanager.Client
}
func NewAWSSecretManagerEngine(logger *logrus.Entry, awsConf aws.Config, metadata map[string]any) (CryptoEngine, error) {
lAWSSM = logger.WithField("subsystem-provider", "AWS SecretsManager Client")
httpCli, err := helpers.BuildHTTPClientWithTracerLogger(http.DefaultClient, lAWSSM)
if err != nil {
return nil, err
}
awsConf.HTTPClient = httpCli
smCli := secretsmanager.NewFromConfig(awsConf)
return &AWSSecretsManagerCryptoEngine{
smngerCli: smCli,
config: models.CryptoEngineInfo{
Type: models.AWSSecretsManager,
SecurityLevel: models.SL1,
Provider: "Amazon Web Services",
Name: "Secrets Manager",
Metadata: metadata,
SupportedKeyTypes: []models.SupportedKeyTypeInfo{
{
Type: models.KeyType(x509.RSA),
Sizes: []int{
2048,
3072,
4096,
},
},
{
Type: models.KeyType(x509.ECDSA),
Sizes: []int{
224,
256,
521,
},
},
},
},
}, nil
}
func (engine *AWSSecretsManagerCryptoEngine) GetEngineConfig() models.CryptoEngineInfo {
return engine.config
}
func (engine *AWSSecretsManagerCryptoEngine) GetPrivateKeyByID(keyID string) (crypto.Signer, error) {
lAWSSM.Debugf("Getting the private key with ID: %s", keyID)
result, err := engine.smngerCli.GetSecretValue(context.Background(), &secretsmanager.GetSecretValueInput{
SecretId: aws.String(keyID),
})
if err != nil {
lAWSSM.Errorf("could not get Secret Value: %s", err)
return nil, err
}
// Decrypts secret using the associated KMS key.
var secretString string = *result.SecretString
var keyMap map[string]string
err = json.Unmarshal([]byte(secretString), &keyMap)
if err != nil {
return nil, err
}
b64Key, ok := keyMap["key"]
if !ok {
lAWSSM.Errorf("'key' variable not found in secret")
return nil, fmt.Errorf("'key' not found in secret")
}
pemBytes, err := base64.StdEncoding.DecodeString(b64Key)
if err != nil {
return nil, err
}
block, _ := pem.Decode(pemBytes)
if block == nil {
return nil, fmt.Errorf("no key found")
}
switch block.Type {
case "RSA PRIVATE KEY":
return x509.ParsePKCS1PrivateKey(block.Bytes)
case "EC PRIVATE KEY":
return x509.ParseECPrivateKey(block.Bytes)
default:
return nil, fmt.Errorf("unsupported key type %q", block.Type)
}
}
func (engine *AWSSecretsManagerCryptoEngine) CreateRSAPrivateKey(keySize int, keyID string) (crypto.Signer, error) {
lAWSSM.Debugf("Creating RSA key with ID %s", keyID)
key, err := rsa.GenerateKey(rand.Reader, keySize)
if err != nil {
lAWSSM.Error("Could not create RSA private key: ", err)
return nil, err
}
return engine.ImportRSAPrivateKey(key, keyID)
}
func (engine *AWSSecretsManagerCryptoEngine) CreateECDSAPrivateKey(curve elliptic.Curve, keyID string) (crypto.Signer, error) {
lAWSSM.Debugf("Creating ECDSA key with ID %s", keyID)
key, err := ecdsa.GenerateKey(curve, rand.Reader)
if err != nil {
lAWSSM.Error("Could not create ECDSA private key: ", err)
return nil, err
}
return engine.ImportECDSAPrivateKey(key, keyID)
}
func (engine *AWSSecretsManagerCryptoEngine) ImportRSAPrivateKey(key *rsa.PrivateKey, keyID string) (crypto.Signer, error) {
lAWSSM.Debugf("Import RSA key with ID: %s", keyID)
keyBytes := pem.EncodeToMemory(&pem.Block{
Bytes: x509.MarshalPKCS1PrivateKey(key),
Type: "RSA PRIVATE KEY",
})
b64Key := base64.StdEncoding.EncodeToString(keyBytes)
keyVal := `{"key": "` + b64Key + `"}`
_, err := engine.smngerCli.CreateSecret(context.Background(), &secretsmanager.CreateSecretInput{
Name: aws.String(keyID),
SecretString: aws.String(keyVal),
})
if err != nil {
lAWSSM.Error("Could not import RSA private key: ", err)
return nil, err
}
return key, nil
}
func (engine *AWSSecretsManagerCryptoEngine) ImportECDSAPrivateKey(key *ecdsa.PrivateKey, keyID string) (crypto.Signer, error) {
lAWSSM.Debugf("Import ECDSA key with ID: %s", keyID)
keyBytes, err := x509.MarshalECPrivateKey(key)
if err != nil {
return nil, err
}
keyBytes = pem.EncodeToMemory(&pem.Block{
Bytes: keyBytes,
Type: "EC PRIVATE KEY",
})
b64Key := base64.StdEncoding.EncodeToString(keyBytes)
keyVal := `{"key": "` + b64Key + `"}`
_, err = engine.smngerCli.CreateSecret(context.Background(), &secretsmanager.CreateSecretInput{
Name: &keyID,
SecretString: aws.String(keyVal),
})
if err != nil {
lAWSSM.Error("Could not import ECDSA private key: ", err)
return nil, err
}
return key, nil
}
func (engine *AWSSecretsManagerCryptoEngine) DeleteKey(keyID string) error {
return fmt.Errorf("cannot delete key [%s]. Go to your aws account and do it manually", keyID)
}