mirror of
https://github.com/edgelesssys/constellation.git
synced 2024-12-17 20:04:36 -05:00
119 lines
4.6 KiB
Go
119 lines
4.6 KiB
Go
package config
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import (
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"bytes"
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"context"
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"encoding/base64"
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"fmt"
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"io"
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"net/http"
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"net/url"
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"github.com/edgelesssys/constellation/internal/attestation/vtpm"
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"github.com/edgelesssys/constellation/internal/sigstore"
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"gopkg.in/yaml.v2"
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)
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type Measurements map[uint32][]byte
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var (
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// gcpPCRs are the PCR values for a GCP Constellation node that are initially set in a generated config file.
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gcpPCRs = Measurements{
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0: {0x0F, 0x35, 0xC2, 0x14, 0x60, 0x8D, 0x93, 0xC7, 0xA6, 0xE6, 0x8A, 0xE7, 0x35, 0x9B, 0x4A, 0x8B, 0xE5, 0xA0, 0xE9, 0x9E, 0xEA, 0x91, 0x07, 0xEC, 0xE4, 0x27, 0xC4, 0xDE, 0xA4, 0xE4, 0x39, 0xCF},
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uint32(vtpm.PCRIndexOwnerID): {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
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uint32(vtpm.PCRIndexClusterID): {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
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}
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// azurePCRs are the PCR values for an Azure Constellation node that are initially set in a generated config file.
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azurePCRs = Measurements{
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uint32(vtpm.PCRIndexOwnerID): {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
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uint32(vtpm.PCRIndexClusterID): {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
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}
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qemuPCRs = Measurements{
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uint32(vtpm.PCRIndexOwnerID): {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
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uint32(vtpm.PCRIndexClusterID): {0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00},
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}
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)
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// FetchAndVerify fetches measurement and signature files via provided URLs,
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// using client for download. The publicKey is used to verify the measurements.
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func (m *Measurements) FetchAndVerify(ctx context.Context, client *http.Client, measurementsURL *url.URL, signatureURL *url.URL, publicKey []byte) error {
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measurements, err := getFromURL(ctx, client, measurementsURL)
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if err != nil {
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return fmt.Errorf("failed to fetch measurements: %w", err)
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}
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signature, err := getFromURL(ctx, client, signatureURL)
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if err != nil {
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return fmt.Errorf("failed to fetch signature: %w", err)
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}
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if err := sigstore.VerifySignature(measurements, signature, publicKey); err != nil {
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return err
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}
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if err := yaml.NewDecoder(bytes.NewReader(measurements)).Decode(&m); err != nil {
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return err
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}
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return nil
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}
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// CopyFrom copies over all values from other. Overwriting existing values,
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// but keeping not specified values untouched.
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func (m Measurements) CopyFrom(other Measurements) {
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for idx := range other {
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m[idx] = other[idx]
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}
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}
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// MarshalYAML overwrites the default behaviour of writing out []byte not as
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// single bytes, but as a single base64 encoded string.
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func (m Measurements) MarshalYAML() (interface{}, error) {
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base64Map := make(map[uint32]string)
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for key, value := range m {
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base64Map[key] = base64.StdEncoding.EncodeToString(value[:])
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}
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return base64Map, nil
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}
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// UnmarshalYAML overwrites the default behaviour of reading []byte not as
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// single bytes, but as a single base64 encoded string.
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func (m *Measurements) UnmarshalYAML(unmarshal func(interface{}) error) error {
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base64Map := make(map[uint32]string)
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err := unmarshal(base64Map)
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if err != nil {
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return err
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}
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*m = make(Measurements)
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for key, value := range base64Map {
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measurement, err := base64.StdEncoding.DecodeString(value)
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if err != nil {
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return err
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}
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(*m)[key] = measurement
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}
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return nil
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}
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func getFromURL(ctx context.Context, client *http.Client, sourceURL *url.URL) ([]byte, error) {
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req, err := http.NewRequestWithContext(ctx, http.MethodGet, sourceURL.String(), http.NoBody)
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if err != nil {
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return []byte{}, err
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}
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resp, err := client.Do(req)
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if err != nil {
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return []byte{}, err
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}
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defer resp.Body.Close()
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if resp.StatusCode != http.StatusOK {
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return []byte{}, fmt.Errorf("http status code: %d", resp.StatusCode)
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}
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content, err := io.ReadAll(resp.Body)
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if err != nil {
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return []byte{}, err
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}
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return content, nil
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}
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