mirror of
https://github.com/edgelesssys/constellation.git
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129 lines
3.8 KiB
Go
129 lines
3.8 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 watcher
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import (
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"context"
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"encoding/asn1"
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"encoding/json"
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"errors"
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"fmt"
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"path/filepath"
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"sync"
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"github.com/edgelesssys/constellation/v2/internal/atls"
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"github.com/edgelesssys/constellation/v2/internal/attestation/choose"
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"github.com/edgelesssys/constellation/v2/internal/attestation/idkeydigest"
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"github.com/edgelesssys/constellation/v2/internal/attestation/measurements"
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"github.com/edgelesssys/constellation/v2/internal/config"
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"github.com/edgelesssys/constellation/v2/internal/constants"
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"github.com/edgelesssys/constellation/v2/internal/file"
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"github.com/edgelesssys/constellation/v2/internal/logger"
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"github.com/edgelesssys/constellation/v2/internal/variant"
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"github.com/spf13/afero"
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)
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// Updatable implements an updatable atls.Validator.
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type Updatable struct {
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log *logger.Logger
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mux sync.Mutex
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fileHandler file.Handler
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variant variant.Variant
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atls.Validator
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}
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// NewValidator initializes a new updatable validator.
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func NewValidator(log *logger.Logger, variant variant.Variant, fileHandler file.Handler) (*Updatable, error) {
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u := &Updatable{
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log: log,
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fileHandler: fileHandler,
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variant: variant,
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}
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if err := u.Update(); err != nil {
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return nil, err
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}
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return u, nil
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}
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// Validate calls the validators Validate method, and prevents any updates during the call.
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func (u *Updatable) Validate(ctx context.Context, attDoc []byte, nonce []byte) ([]byte, error) {
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u.mux.Lock()
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defer u.mux.Unlock()
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return u.Validator.Validate(ctx, attDoc, nonce)
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}
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// OID returns the validators Object Identifier.
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func (u *Updatable) OID() asn1.ObjectIdentifier {
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u.mux.Lock()
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defer u.mux.Unlock()
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return u.Validator.OID()
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}
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// Update switches out the underlying validator.
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func (u *Updatable) Update() error {
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u.mux.Lock()
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defer u.mux.Unlock()
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u.log.Infof("Updating expected measurements")
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var measurements measurements.M
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if err := u.fileHandler.ReadJSON(filepath.Join(constants.ServiceBasePath, constants.MeasurementsFilename), &measurements); err != nil {
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return err
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}
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u.log.Debugf("New measurements: %+v", measurements)
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// Read ID Key config
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var idKeyCfg config.SNPFirmwareSignerConfig
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if u.variant.Equal(variant.AzureSEVSNP{}) {
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u.log.Infof("Updating SEV-SNP ID Key config")
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err := u.fileHandler.ReadJSON(filepath.Join(constants.ServiceBasePath, constants.IDKeyConfigFilename), &idKeyCfg)
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if err != nil {
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if !errors.Is(err, afero.ErrFileNotFound) {
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return fmt.Errorf("reading ID Key config: %w", err)
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}
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u.log.Warnf("ID Key config file not found, falling back to old format (v2.6 or earlier)")
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// v2.6 fallback
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// TODO: Remove after v2.7 release
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var digest idkeydigest.List
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var enforceIDKeyDigest idkeydigest.Enforcement
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enforceRaw, err := u.fileHandler.Read(filepath.Join(constants.ServiceBasePath, constants.EnforceIDKeyDigestFilename))
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if err != nil {
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return err
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}
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enforceIDKeyDigest = idkeydigest.EnforcePolicyFromString(string(enforceRaw))
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if err != nil {
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return fmt.Errorf("parsing content of EnforceIdKeyDigestFilename: %s: %w", enforceRaw, err)
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}
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idkeydigestRaw, err := u.fileHandler.Read(filepath.Join(constants.ServiceBasePath, constants.IDKeyDigestFilename))
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if err != nil {
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return err
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}
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if err = json.Unmarshal(idkeydigestRaw, &digest); err != nil {
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return fmt.Errorf("unmarshaling content of IDKeyDigestFilename: %s: %w", idkeydigestRaw, err)
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}
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idKeyCfg.AcceptedKeyDigests = digest
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idKeyCfg.EnforcementPolicy = enforceIDKeyDigest
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}
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u.log.Debugf("New ID Key config: %+v", idKeyCfg)
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}
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validator, err := choose.Validator(u.variant, measurements, idKeyCfg, u.log)
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if err != nil {
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return fmt.Errorf("updating validator: %w", err)
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}
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u.Validator = validator
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return nil
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}
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