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https://github.com/edgelesssys/constellation.git
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90b88e1cf9
In the light of extending our eKMS support it will be helpful to have a tighter use of the word "KMS". KMS should refer to the actual component that manages keys. The keyservice, also called KMS in the constellation code, does not manage keys itself. It talks to a KMS backend, which in turn does the actual key management.
64 lines
1.7 KiB
Go
64 lines
1.7 KiB
Go
/*
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Copyright (c) Edgeless Systems GmbH
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SPDX-License-Identifier: AGPL-3.0-only
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*/
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package kms
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import (
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"context"
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"fmt"
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"github.com/edgelesssys/constellation/v2/keyservice/keyserviceproto"
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"google.golang.org/grpc"
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"google.golang.org/grpc/credentials/insecure"
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)
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// ConstellationKMS is a key service to fetch volume keys.
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type ConstellationKMS struct {
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endpoint string
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kms kmsClient
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}
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// NewConstellationKMS initializes a ConstellationKMS.
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func NewConstellationKMS(endpoint string) *ConstellationKMS {
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return &ConstellationKMS{
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endpoint: endpoint, // default: "kms.kube-system:port"
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kms: &constellationKMSClient{},
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}
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}
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// GetDEK request a data encryption key derived from the Constellation's master secret.
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func (k *ConstellationKMS) GetDEK(ctx context.Context, dekID string, dekSize int) ([]byte, error) {
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conn, err := grpc.DialContext(ctx, k.endpoint, grpc.WithTransportCredentials(insecure.NewCredentials()))
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if err != nil {
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return nil, err
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}
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defer conn.Close()
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res, err := k.kms.GetDataKey(
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ctx,
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&keyserviceproto.GetDataKeyRequest{
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DataKeyId: dekID,
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Length: uint32(dekSize),
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},
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conn,
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)
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if err != nil {
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return nil, fmt.Errorf("fetching data encryption key from Constellation KMS: %w", err)
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}
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return res.DataKey, nil
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}
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type kmsClient interface {
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GetDataKey(context.Context, *keyserviceproto.GetDataKeyRequest, *grpc.ClientConn) (*keyserviceproto.GetDataKeyResponse, error)
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}
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type constellationKMSClient struct{}
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func (c *constellationKMSClient) GetDataKey(ctx context.Context, req *keyserviceproto.GetDataKeyRequest, conn *grpc.ClientConn) (*keyserviceproto.GetDataKeyResponse, error) {
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return keyserviceproto.NewAPIClient(conn).GetDataKey(ctx, req)
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}
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