constellation/internal/api/attestationconfigapi/client.go

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/*
Copyright (c) Edgeless Systems GmbH
SPDX-License-Identifier: AGPL-3.0-only
*/
package attestationconfigapi
import (
"context"
"encoding/json"
"fmt"
"time"
apiclient "github.com/edgelesssys/constellation/v2/internal/api/client"
"github.com/edgelesssys/constellation/v2/internal/logger"
"github.com/edgelesssys/constellation/v2/internal/sigstore"
"github.com/edgelesssys/constellation/v2/internal/staticupload"
"github.com/edgelesssys/constellation/v2/internal/variant"
)
// Client manages (modifies) the version information for the attestation variants.
type Client struct {
s3Client *apiclient.Client
s3ClientClose func(ctx context.Context) error
bucketID string
signer sigstore.Signer
}
// NewClient returns a new Client.
func NewClient(ctx context.Context, cfg staticupload.Config, cosignPwd, privateKey []byte, dryRun bool, log *logger.Logger) (*Client, apiclient.CloseFunc, error) {
s3Client, clientClose, err := apiclient.NewClient(ctx, cfg.Region, cfg.Bucket, cfg.DistributionID, dryRun, log)
if err != nil {
return nil, nil, fmt.Errorf("failed to create s3 storage: %w", err)
}
repo := &Client{
s3Client: s3Client,
s3ClientClose: clientClose,
signer: sigstore.NewSigner(cosignPwd, privateKey),
bucketID: cfg.Bucket,
}
return repo, clientClose, nil
}
// UploadAzureSEVSNP uploads the latest version numbers of the Azure SEVSNP. Then version name is the UTC timestamp of the date. The /list entry stores the version name + .json suffix.
func (a Client) UploadAzureSEVSNP(ctx context.Context, version AzureSEVSNPVersion, date time.Time) error {
versions, err := a.List(ctx, variant.AzureSEVSNP{})
if err != nil {
return fmt.Errorf("fetch version list: %w", err)
}
ops, err := a.uploadAzureSEVSNP(version, versions, date)
if err != nil {
return err
}
return executeAllCmds(ctx, a.s3Client, ops)
}
// DeleteAzureSEVSNPVersion deletes the given version (without .json suffix) from the API.
func (a Client) DeleteAzureSEVSNPVersion(ctx context.Context, versionStr string) error {
versions, err := a.List(ctx, variant.AzureSEVSNP{})
if err != nil {
return fmt.Errorf("fetch version list: %w", err)
}
ops, err := a.deleteAzureSEVSNPVersion(versions, versionStr)
if err != nil {
return err
}
return executeAllCmds(ctx, a.s3Client, ops)
}
// List returns the list of versions for the given attestation type.
func (a Client) List(ctx context.Context, attestation variant.Variant) ([]string, error) {
if attestation.Equal(variant.AzureSEVSNP{}) {
versions, err := apiclient.Fetch(ctx, a.s3Client, AzureSEVSNPVersionList{})
if err != nil {
return nil, err
}
return versions, nil
}
return nil, fmt.Errorf("unsupported attestation type: %s", attestation)
}
func (a Client) deleteAzureSEVSNPVersion(versions AzureSEVSNPVersionList, versionStr string) (ops []crudCmd, err error) {
versionStr = versionStr + ".json"
ops = append(ops, deleteCmd{
apiObject: AzureSEVSNPVersionAPI{
Version: versionStr,
},
})
ops = append(ops, deleteCmd{
apiObject: AzureSEVSNPVersionSignature{
Version: versionStr,
},
})
removedVersions, err := removeVersion(versions, versionStr)
if err != nil {
return nil, err
}
ops = append(ops, putCmd{
apiObject: removedVersions,
})
return ops, nil
}
func (a Client) uploadAzureSEVSNP(versions AzureSEVSNPVersion, versionNames []string, date time.Time) (res []crudCmd, err error) {
dateStr := date.Format("2006-01-02-15-04") + ".json"
res = append(res, putCmd{AzureSEVSNPVersionAPI{Version: dateStr, AzureSEVSNPVersion: versions}})
versionBytes, err := json.Marshal(versions)
if err != nil {
return res, err
}
signature, err := a.createSignature(versionBytes, dateStr)
if err != nil {
return res, err
}
res = append(res, putCmd{signature})
newVersions := addVersion(versionNames, dateStr)
res = append(res, putCmd{AzureSEVSNPVersionList(newVersions)})
return
}
func (a Client) createSignature(content []byte, dateStr string) (res AzureSEVSNPVersionSignature, err error) {
signature, err := a.signer.Sign(content)
if err != nil {
return res, fmt.Errorf("sign version file: %w", err)
}
return AzureSEVSNPVersionSignature{
Signature: signature,
Version: dateStr,
}, nil
}
func removeVersion(versions AzureSEVSNPVersionList, versionStr string) (removedVersions AzureSEVSNPVersionList, err error) {
for i, v := range versions {
if v == versionStr {
if i == len(versions)-1 {
removedVersions = versions[:i]
} else {
removedVersions = append(versions[:i], versions[i+1:]...)
}
return removedVersions, nil
}
}
return nil, fmt.Errorf("version %s not found in list %v", versionStr, versions)
}
type crudCmd interface {
Execute(ctx context.Context, c *apiclient.Client) error
}
type deleteCmd struct {
apiObject apiclient.APIObject
}
func (d deleteCmd) Execute(ctx context.Context, c *apiclient.Client) error {
return apiclient.Delete(ctx, c, d.apiObject)
}
type putCmd struct {
apiObject apiclient.APIObject
}
func (p putCmd) Execute(ctx context.Context, c *apiclient.Client) error {
return apiclient.Update(ctx, c, p.apiObject)
}
func executeAllCmds(ctx context.Context, client *apiclient.Client, cmds []crudCmd) error {
for _, cmd := range cmds {
if err := cmd.Execute(ctx, client); err != nil {
return fmt.Errorf("execute operation %+v: %w", cmd, err)
}
}
return nil
}
func addVersion(versions []string, newVersion string) []string {
versions = append(versions, newVersion)
versions = variant.RemoveDuplicate(versions)
SortAzureSEVSNPVersionList(versions)
return versions
}