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https://github.com/edgelesssys/constellation.git
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ba4471a228
* Add warnings for non enforced, untrusted PCRs * Fix global state in Config PCR map Signed-off-by: Daniel Weiße <dw@edgeless.systems>
92 lines
2.8 KiB
Go
92 lines
2.8 KiB
Go
package watcher
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import (
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"encoding/asn1"
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"fmt"
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"path/filepath"
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"sync"
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"github.com/edgelesssys/constellation/internal/atls"
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"github.com/edgelesssys/constellation/internal/attestation/azure"
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"github.com/edgelesssys/constellation/internal/attestation/gcp"
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"github.com/edgelesssys/constellation/internal/attestation/qemu"
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"github.com/edgelesssys/constellation/internal/cloud/cloudprovider"
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"github.com/edgelesssys/constellation/internal/constants"
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"github.com/edgelesssys/constellation/internal/file"
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"github.com/edgelesssys/constellation/internal/logger"
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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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newValidator newValidatorFunc
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fileHandler file.Handler
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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, csp string, fileHandler file.Handler) (*Updatable, error) {
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var newValidator newValidatorFunc
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switch cloudprovider.FromString(csp) {
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case cloudprovider.Azure:
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newValidator = func(m map[uint32][]byte, e []uint32) atls.Validator { return azure.NewValidator(m, e) }
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case cloudprovider.GCP:
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newValidator = func(m map[uint32][]byte, e []uint32) atls.Validator { return gcp.NewValidator(m, e) }
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case cloudprovider.QEMU:
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newValidator = func(m map[uint32][]byte, e []uint32) atls.Validator { return qemu.NewValidator(m, e) }
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default:
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return nil, fmt.Errorf("unknown cloud service provider: %q", csp)
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}
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u := &Updatable{
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log: log,
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newValidator: newValidator,
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fileHandler: fileHandler,
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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(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(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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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 map[uint32][]byte
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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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var enforced []uint32
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if err := u.fileHandler.ReadJSON(filepath.Join(constants.ServiceBasePath, constants.EnforcedPCRsFilename), &enforced); err != nil {
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return err
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}
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u.log.Debugf("Enforced PCRs: %v", enforced)
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u.Validator = u.newValidator(measurements, enforced)
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u.Validator.AddLogger(u.log)
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return nil
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}
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type newValidatorFunc func(measurements map[uint32][]byte, enforcedPCRs []uint32) atls.Validator
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