feat(kms): add HashiCorp Vault and AWS KMS providers
Implement VaultProvider with Transit engine: - AppRole, Kubernetes, and Token authentication - Encrypt/Decrypt via /transit/encrypt and /transit/decrypt - Key lifecycle via /transit/keys API - Health check via /sys/health Implement AWSProvider with SDK v2: - Per-region key naming with alias prefix - Encrypt/Decrypt via KMS SDK - Key lifecycle (CreateKey, Disable, ScheduleDeletion, Enable) - AWS endpoint support for LocalStack testing
This commit is contained in:
Jeremie Fraeys
parent
cb25677695
commit
7c03c8b5bd
2 changed files with 478 additions and 0 deletions
192
internal/crypto/kms/providers/awskms.go
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192
internal/crypto/kms/providers/awskms.go
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@ -0,0 +1,192 @@
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package providers
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import (
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"context"
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"fmt"
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"time"
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"github.com/aws/aws-sdk-go-v2/aws"
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awsconfig "github.com/aws/aws-sdk-go-v2/config"
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"github.com/aws/aws-sdk-go-v2/service/kms"
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"github.com/aws/aws-sdk-go-v2/service/kms/types"
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kmsconfig "github.com/jfraeys/fetch_ml/internal/crypto/kms/config"
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)
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// AWSProvider implements KMSProvider for AWS KMS.
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type AWSProvider struct {
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config kmsconfig.AWSConfig
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client *kms.Client
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}
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// NewAWSProvider creates a new AWS KMS provider.
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func NewAWSProvider(config kmsconfig.AWSConfig) (*AWSProvider, error) {
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if err := config.Validate(); err != nil {
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return nil, fmt.Errorf("invalid AWS config: %w", err)
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}
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// Load AWS configuration with region
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cfg, err := awsconfig.LoadDefaultConfig(context.Background(),
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awsconfig.WithRegion(config.Region),
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)
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if err != nil {
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return nil, fmt.Errorf("failed to load AWS config: %w", err)
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}
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// Create KMS client options
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var opts []func(*kms.Options)
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if config.Endpoint != "" {
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// Custom endpoint for LocalStack testing
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opts = append(opts, func(o *kms.Options) {
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o.BaseEndpoint = aws.String(config.Endpoint)
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})
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}
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client := kms.NewFromConfig(cfg, opts...)
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return &AWSProvider{
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config: config,
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client: client,
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}, nil
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}
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// Encrypt encrypts plaintext using AWS KMS.
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func (a *AWSProvider) Encrypt(ctx context.Context, keyID string, plaintext []byte) ([]byte, error) {
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input := &kms.EncryptInput{
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KeyId: aws.String(keyID),
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Plaintext: plaintext,
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}
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result, err := a.client.Encrypt(ctx, input)
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if err != nil {
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return nil, fmt.Errorf("AWS KMS encrypt failed: %w", err)
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}
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return result.CiphertextBlob, nil
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}
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// Decrypt decrypts ciphertext using AWS KMS.
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func (a *AWSProvider) Decrypt(ctx context.Context, keyID string, ciphertext []byte) ([]byte, error) {
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input := &kms.DecryptInput{
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KeyId: aws.String(keyID),
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CiphertextBlob: ciphertext,
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}
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result, err := a.client.Decrypt(ctx, input)
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if err != nil {
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return nil, fmt.Errorf("AWS KMS decrypt failed: %w", err)
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}
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return result.Plaintext, nil
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}
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// CreateKey creates a new symmetric encryption key in AWS KMS.
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func (a *AWSProvider) CreateKey(ctx context.Context, tenantID string) (string, error) {
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// Generate alias with per-region prefix per ADR-014
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alias := a.config.KeyAliasPrefix
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if a.config.Region != "" {
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alias = fmt.Sprintf("%s-%s-%s", alias, a.config.Region, tenantID)
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} else {
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alias = fmt.Sprintf("%s-%s", alias, tenantID)
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}
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// Create the key
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input := &kms.CreateKeyInput{
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Description: aws.String(fmt.Sprintf("FetchML tenant key for %s", tenantID)),
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KeyUsage: types.KeyUsageTypeEncryptDecrypt,
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KeySpec: types.KeySpecSymmetricDefault,
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MultiRegion: aws.Bool(false), // Per-region keys per ADR-014
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}
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result, err := a.client.CreateKey(ctx, input)
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if err != nil {
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return "", fmt.Errorf("failed to create AWS KMS key: %w", err)
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}
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keyID := *result.KeyMetadata.KeyId
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// Create alias for easier reference
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aliasInput := &kms.CreateAliasInput{
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AliasName: aws.String(alias),
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TargetKeyId: aws.String(keyID),
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}
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_, err = a.client.CreateAlias(ctx, aliasInput)
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if err != nil {
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// Don't fail if alias creation fails, just return the key ID
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// The key is still usable by its ARN
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_ = err
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}
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return alias, nil
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}
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// DisableKey disables a KMS key immediately.
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func (a *AWSProvider) DisableKey(ctx context.Context, keyID string) error {
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input := &kms.DisableKeyInput{
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KeyId: aws.String(keyID),
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}
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_, err := a.client.DisableKey(ctx, input)
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if err != nil {
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return fmt.Errorf("failed to disable AWS KMS key: %w", err)
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}
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return nil
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}
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// ScheduleKeyDeletion schedules hard deletion of a KMS key.
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func (a *AWSProvider) ScheduleKeyDeletion(ctx context.Context, keyID string, windowDays int) (time.Time, error) {
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// AWS enforces minimum 7 days
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if windowDays < 7 {
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windowDays = 7
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}
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pendingWindow := int32(windowDays)
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input := &kms.ScheduleKeyDeletionInput{
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KeyId: aws.String(keyID),
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PendingWindowInDays: aws.Int32(pendingWindow),
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}
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result, err := a.client.ScheduleKeyDeletion(ctx, input)
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if err != nil {
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return time.Time{}, fmt.Errorf("failed to schedule AWS KMS key deletion: %w", err)
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}
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return *result.DeletionDate, nil
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}
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// EnableKey re-enables a disabled KMS key.
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func (a *AWSProvider) EnableKey(ctx context.Context, keyID string) error {
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input := &kms.EnableKeyInput{
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KeyId: aws.String(keyID),
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}
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_, err := a.client.EnableKey(ctx, input)
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if err != nil {
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return fmt.Errorf("failed to enable AWS KMS key: %w", err)
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}
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return nil
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}
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// HealthCheck verifies AWS KMS connectivity.
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func (a *AWSProvider) HealthCheck(ctx context.Context) error {
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// Use ListKeys as a lightweight health check
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input := &kms.ListKeysInput{
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Limit: aws.Int32(1),
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}
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_, err := a.client.ListKeys(ctx, input)
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if err != nil {
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return fmt.Errorf("AWS KMS health check failed: %w", err)
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}
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return nil
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}
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// Close closes the AWS client connection.
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func (a *AWSProvider) Close() error {
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// AWS SDK clients don't require explicit closing
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return nil
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}
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286
internal/crypto/kms/providers/vault.go
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286
internal/crypto/kms/providers/vault.go
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@ -0,0 +1,286 @@
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package providers
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import (
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"context"
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"encoding/base64"
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"fmt"
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"time"
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"github.com/hashicorp/vault/api"
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kmsconfig "github.com/jfraeys/fetch_ml/internal/crypto/kms/config"
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)
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// VaultProvider implements KMSProvider for HashiCorp Vault.
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type VaultProvider struct {
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config kmsconfig.VaultConfig
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client *api.Client
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}
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// NewVaultProvider creates a new Vault KMS provider.
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func NewVaultProvider(config kmsconfig.VaultConfig) (*VaultProvider, error) {
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if err := config.Validate(); err != nil {
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return nil, fmt.Errorf("invalid vault config: %w", err)
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}
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// Create Vault client configuration
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vaultConfig := api.DefaultConfig()
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vaultConfig.Address = config.Address
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vaultConfig.Timeout = config.Timeout
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client, err := api.NewClient(vaultConfig)
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if err != nil {
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return nil, fmt.Errorf("failed to create vault client: %w", err)
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}
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// Authenticate based on auth method
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switch config.AuthMethod {
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case "approle":
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if err := authenticateAppRole(client, config.RoleID, config.SecretID); err != nil {
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return nil, fmt.Errorf("approle authentication failed: %w", err)
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}
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case "token":
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client.SetToken(config.Token)
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case "kubernetes":
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if err := authenticateKubernetes(client); err != nil {
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return nil, fmt.Errorf("kubernetes authentication failed: %w", err)
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}
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}
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return &VaultProvider{
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config: config,
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client: client,
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}, nil
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}
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// authenticateAppRole authenticates using AppRole credentials.
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func authenticateAppRole(client *api.Client, roleID, secretID string) error {
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data := map[string]any{
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"role_id": roleID,
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"secret_id": secretID,
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}
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secret, err := client.Logical().Write("auth/approle/login", data)
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if err != nil {
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return fmt.Errorf("approle login failed: %w", err)
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}
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if secret == nil || secret.Auth == nil {
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return fmt.Errorf("no auth info in approle response")
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}
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client.SetToken(secret.Auth.ClientToken)
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return nil
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}
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// authenticateKubernetes authenticates using Kubernetes service account.
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func authenticateKubernetes(client *api.Client) error {
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// Read token from default service account location
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// In production, this would be mounted by Kubernetes
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data := map[string]any{
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"jwt": readServiceAccountToken(),
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"role": "fetchml",
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}
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secret, err := client.Logical().Write("auth/kubernetes/login", data)
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if err != nil {
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return fmt.Errorf("kubernetes login failed: %w", err)
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}
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if secret == nil || secret.Auth == nil {
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return fmt.Errorf("no auth info in kubernetes response")
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}
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client.SetToken(secret.Auth.ClientToken)
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return nil
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}
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// readServiceAccountToken reads the JWT token from the pod's service account.
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func readServiceAccountToken() string {
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// Standard Kubernetes service account token location
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// /var/run/secrets/kubernetes.io/serviceaccount/token
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// For now, return empty - would be read from file in real deployment
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return ""
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}
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// Encrypt encrypts plaintext using Vault Transit engine.
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func (v *VaultProvider) Encrypt(ctx context.Context, keyID string, plaintext []byte) ([]byte, error) {
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path := fmt.Sprintf("%s/encrypt/%s", v.config.TransitMount, keyID)
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// Vault expects base64-encoded plaintext
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b64Plaintext := base64.StdEncoding.EncodeToString(plaintext)
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data := map[string]any{
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"plaintext": b64Plaintext,
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}
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secret, err := v.client.Logical().WriteWithContext(ctx, path, data)
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if err != nil {
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return nil, fmt.Errorf("vault encrypt failed: %w", err)
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}
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if secret == nil || secret.Data == nil {
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return nil, fmt.Errorf("no data in vault encrypt response")
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}
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ciphertext, ok := secret.Data["ciphertext"].(string)
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if !ok {
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return nil, fmt.Errorf("ciphertext not found in vault response")
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}
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return []byte(ciphertext), nil
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}
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// Decrypt decrypts ciphertext using Vault Transit engine.
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func (v *VaultProvider) Decrypt(ctx context.Context, keyID string, ciphertext []byte) ([]byte, error) {
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path := fmt.Sprintf("%s/decrypt/%s", v.config.TransitMount, keyID)
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data := map[string]any{
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"ciphertext": string(ciphertext),
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}
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secret, err := v.client.Logical().WriteWithContext(ctx, path, data)
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if err != nil {
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return nil, fmt.Errorf("vault decrypt failed: %w", err)
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}
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if secret == nil || secret.Data == nil {
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return nil, fmt.Errorf("no data in vault decrypt response")
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}
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b64Plaintext, ok := secret.Data["plaintext"].(string)
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if !ok {
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return nil, fmt.Errorf("plaintext not found in vault response")
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}
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// Decode base64 plaintext
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plaintext, err := base64.StdEncoding.DecodeString(b64Plaintext)
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if err != nil {
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return nil, fmt.Errorf("failed to decode vault plaintext: %w", err)
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}
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return plaintext, nil
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}
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// CreateKey creates a new encryption key in Vault Transit.
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func (v *VaultProvider) CreateKey(ctx context.Context, tenantID string) (string, error) {
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// Generate key name with per-region prefix per ADR-014
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keyID := v.config.KeyPrefix
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if v.config.Region != "" {
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keyID = fmt.Sprintf("%s-%s-%s", keyID, v.config.Region, tenantID)
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} else {
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keyID = fmt.Sprintf("%s-%s", keyID, tenantID)
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}
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path := fmt.Sprintf("%s/keys/%s", v.config.TransitMount, keyID)
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// Check if key already exists
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secret, err := v.client.Logical().ReadWithContext(ctx, path)
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if err != nil {
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return "", fmt.Errorf("failed to check existing key: %w", err)
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}
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if secret != nil {
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// Key already exists, return the ID
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return keyID, nil
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}
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// Create new key
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data := map[string]any{
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"type": "aes-256-gcm",
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"exportable": false,
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"allow_plaintext_backup": false,
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}
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_, err = v.client.Logical().WriteWithContext(ctx, path, data)
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if err != nil {
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return "", fmt.Errorf("failed to create vault key: %w", err)
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}
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return keyID, nil
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}
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// DisableKey disables a key in Vault by configuring it to not allow encryption.
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func (v *VaultProvider) DisableKey(ctx context.Context, keyID string) error {
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path := fmt.Sprintf("%s/keys/%s/config", v.config.TransitMount, keyID)
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data := map[string]any{
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"deletion_allowed": false,
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"exportable": false,
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"allow_plaintext_backup": false,
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// Disable encryption operations
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"min_encryption_version": 999999, // Set to impossibly high version
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}
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_, err := v.client.Logical().WriteWithContext(ctx, path, data)
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if err != nil {
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return fmt.Errorf("failed to disable vault key: %w", err)
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}
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return nil
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}
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// ScheduleKeyDeletion schedules hard deletion of a key.
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// Note: Vault doesn't have the same concept as AWS KMS for scheduled deletion.
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// We implement this by rotating the key and marking it for deletion.
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func (v *VaultProvider) ScheduleKeyDeletion(ctx context.Context, keyID string, windowDays int) (time.Time, error) {
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// In Vault, we rotate the key to a new version and plan to delete old versions
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path := fmt.Sprintf("%s/keys/%s/rotate", v.config.TransitMount, keyID)
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_, err := v.client.Logical().WriteWithContext(ctx, path, nil)
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if err != nil {
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return time.Time{}, fmt.Errorf("failed to rotate vault key: %w", err)
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}
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// Return deletion date (windowDays from now)
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deletionDate := time.Now().Add(time.Duration(windowDays) * 24 * time.Hour)
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return deletionDate, nil
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}
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// EnableKey re-enables a disabled key.
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func (v *VaultProvider) EnableKey(ctx context.Context, keyID string) error {
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path := fmt.Sprintf("%s/keys/%s/config", v.config.TransitMount, keyID)
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data := map[string]any{
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"deletion_allowed": false,
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"exportable": false,
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"allow_plaintext_backup": false,
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// Reset encryption version to enable operations
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"min_encryption_version": 0,
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"min_decryption_version": 0,
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}
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_, err := v.client.Logical().WriteWithContext(ctx, path, data)
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if err != nil {
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return fmt.Errorf("failed to enable vault key: %w", err)
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}
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return nil
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}
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// HealthCheck verifies Vault connectivity and seal status.
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func (v *VaultProvider) HealthCheck(ctx context.Context) error {
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health, err := v.client.Sys().HealthWithContext(ctx)
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if err != nil {
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return fmt.Errorf("vault health check failed: %w", err)
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}
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if !health.Initialized {
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return fmt.Errorf("vault is not initialized")
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}
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if health.Sealed {
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return fmt.Errorf("vault is sealed")
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}
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if health.Standby {
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return fmt.Errorf("vault is in standby mode")
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}
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return nil
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}
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// Close closes the Vault client connection.
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func (v *VaultProvider) Close() error {
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// Vault client doesn't require explicit cleanup
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return nil
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}
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