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https://github.com/edgelesssys/constellation.git
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d7a2ddd939
* Add attestation options to config * Add join-config migration path for clusters with old measurement format * Always create MAA provider for Azure SNP clusters * Remove confidential VM option from provider in favor of attestation options * cli: add config migrate command to handle config migration (#1678) --------- Signed-off-by: Daniel Weiße <dw@edgeless.systems>
89 lines
2.8 KiB
Go
89 lines
2.8 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 cloudcmd
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import (
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"crypto/sha256"
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"encoding/base64"
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"encoding/hex"
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"fmt"
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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/measurements"
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"github.com/edgelesssys/constellation/v2/internal/config"
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"github.com/spf13/cobra"
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)
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// NewValidator creates a new Validator.
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func NewValidator(cmd *cobra.Command, config config.AttestationCfg, log debugLog) (atls.Validator, error) {
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return choose.Validator(config, warnLogger{cmd: cmd, log: log})
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}
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// UpdateInitPCRs sets the owner and cluster PCR values.
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func UpdateInitPCRs(config config.AttestationCfg, ownerID, clusterID string) error {
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m := config.GetMeasurements()
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if err := updatePCR(m, uint32(measurements.PCRIndexOwnerID), ownerID); err != nil {
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return err
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}
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return updatePCR(m, uint32(measurements.PCRIndexClusterID), clusterID)
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}
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// updatePCR adds a new entry to the measurements of v, or removes the key if the input is an empty string.
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//
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// When adding, the input is first decoded from hex or base64.
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// We then calculate the expected PCR by hashing the input using SHA256,
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// appending expected PCR for initialization, and then hashing once more.
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func updatePCR(m measurements.M, pcrIndex uint32, encoded string) error {
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if encoded == "" {
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delete(m, pcrIndex)
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return nil
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}
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// decode from hex or base64
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decoded, err := hex.DecodeString(encoded)
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if err != nil {
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hexErr := err
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decoded, err = base64.StdEncoding.DecodeString(encoded)
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if err != nil {
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return fmt.Errorf("input [%s] could neither be hex decoded (%w) nor base64 decoded (%w)", encoded, hexErr, err)
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}
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}
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// new_pcr_value := hash(old_pcr_value || data_to_extend)
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// Since we use the TPM2_PCR_Event call to extend the PCR, data_to_extend is the hash of our input
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hashedInput := sha256.Sum256(decoded)
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oldExpected := m[pcrIndex].Expected
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expectedPcr := sha256.Sum256(append(oldExpected[:], hashedInput[:]...))
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m[pcrIndex] = measurements.Measurement{
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Expected: expectedPcr,
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ValidationOpt: m[pcrIndex].ValidationOpt,
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}
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return nil
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}
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// warnLogger implements logging of warnings for validators.
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type warnLogger struct {
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cmd *cobra.Command
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log debugLog
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}
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// Infof messages are reduced to debug messages, since we don't want
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// the extra info when using the CLI without setting the debug flag.
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func (wl warnLogger) Infof(fmtStr string, args ...any) {
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wl.log.Debugf(fmtStr, args...)
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}
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// Warnf prints a formatted warning from the validator.
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func (wl warnLogger) Warnf(fmtStr string, args ...any) {
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wl.cmd.PrintErrf("Warning: %s\n", fmt.Sprintf(fmtStr, args...))
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}
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type debugLog interface {
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Debugf(format string, args ...any)
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Sync()
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}
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