3bd38fd5dc
* OSS portion of wrapper-v2 * Prefetch barrier type to avoid encountering an error in the simple BarrierType() getter * Rename the OveriddenType to WrapperType and use it for the barrier type prefetch * Fix unit test
1028 lines
36 KiB
Go
1028 lines
36 KiB
Go
package vault
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import (
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"bytes"
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"context"
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"crypto/subtle"
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"encoding/hex"
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"encoding/json"
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"fmt"
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"net/http"
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wrapping "github.com/hashicorp/go-kms-wrapping/v2"
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aeadwrapper "github.com/hashicorp/go-kms-wrapping/wrappers/aead/v2"
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"github.com/hashicorp/go-uuid"
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"github.com/hashicorp/vault/helper/pgpkeys"
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"github.com/hashicorp/vault/sdk/helper/consts"
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"github.com/hashicorp/vault/sdk/helper/jsonutil"
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"github.com/hashicorp/vault/sdk/logical"
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"github.com/hashicorp/vault/sdk/physical"
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"github.com/hashicorp/vault/shamir"
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"github.com/hashicorp/vault/vault/seal"
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)
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const (
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// coreUnsealKeysBackupPath is the path used to backup encrypted unseal
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// keys if specified during a rekey operation. This is outside of the
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// barrier.
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coreBarrierUnsealKeysBackupPath = "core/unseal-keys-backup"
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// coreRecoveryUnsealKeysBackupPath is the path used to backup encrypted
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// recovery keys if specified during a rekey operation. This is outside of
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// the barrier.
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coreRecoveryUnsealKeysBackupPath = "core/recovery-keys-backup"
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)
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// RekeyResult is used to provide the key parts back after
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// they are generated as part of the rekey.
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type RekeyResult struct {
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SecretShares [][]byte
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PGPFingerprints []string
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Backup bool
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RecoveryKey bool
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VerificationRequired bool
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VerificationNonce string
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}
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type RekeyVerifyResult struct {
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Complete bool
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Nonce string
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}
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// RekeyBackup stores the backup copy of PGP-encrypted keys
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type RekeyBackup struct {
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Nonce string
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Keys map[string][]string
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}
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// RekeyThreshold returns the secret threshold for the current seal
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// config. This threshold can either be the barrier key threshold or
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// the recovery key threshold, depending on whether rekey is being
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// performed on the recovery key, or whether the seal supports
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// recovery keys.
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func (c *Core) RekeyThreshold(ctx context.Context, recovery bool) (int, logical.HTTPCodedError) {
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c.stateLock.RLock()
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defer c.stateLock.RUnlock()
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if c.Sealed() {
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return 0, logical.CodedError(http.StatusServiceUnavailable, consts.ErrSealed.Error())
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}
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if c.standby {
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return 0, logical.CodedError(http.StatusBadRequest, consts.ErrStandby.Error())
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}
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c.rekeyLock.RLock()
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defer c.rekeyLock.RUnlock()
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var config *SealConfig
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var err error
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// If we are rekeying the recovery key, or if the seal supports
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// recovery keys and we are rekeying the barrier key, we use the
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// recovery config as the threshold instead.
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if recovery || c.seal.RecoveryKeySupported() {
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config, err = c.seal.RecoveryConfig(ctx)
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} else {
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config, err = c.seal.BarrierConfig(ctx)
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}
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if err != nil {
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return 0, logical.CodedError(http.StatusInternalServerError, fmt.Errorf("unable to look up config: %w", err).Error())
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}
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if config == nil {
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return 0, logical.CodedError(http.StatusBadRequest, ErrNotInit.Error())
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}
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return config.SecretThreshold, nil
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}
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// RekeyProgress is used to return the rekey progress (num shares).
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func (c *Core) RekeyProgress(recovery, verification bool) (bool, int, logical.HTTPCodedError) {
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c.stateLock.RLock()
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defer c.stateLock.RUnlock()
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if c.Sealed() {
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return false, 0, logical.CodedError(http.StatusServiceUnavailable, consts.ErrSealed.Error())
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}
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if c.standby {
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return false, 0, logical.CodedError(http.StatusBadRequest, consts.ErrStandby.Error())
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}
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c.rekeyLock.RLock()
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defer c.rekeyLock.RUnlock()
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var conf *SealConfig
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if recovery {
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conf = c.recoveryRekeyConfig
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} else {
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conf = c.barrierRekeyConfig
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}
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if conf == nil {
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return false, 0, logical.CodedError(http.StatusBadRequest, "rekey operation not in progress")
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}
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if verification {
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return len(conf.VerificationKey) > 0, len(conf.VerificationProgress), nil
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}
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return true, len(conf.RekeyProgress), nil
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}
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// RekeyConfig is used to read the rekey configuration
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func (c *Core) RekeyConfig(recovery bool) (*SealConfig, logical.HTTPCodedError) {
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c.stateLock.RLock()
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defer c.stateLock.RUnlock()
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if c.Sealed() {
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return nil, logical.CodedError(http.StatusServiceUnavailable, consts.ErrSealed.Error())
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}
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if c.standby {
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return nil, logical.CodedError(http.StatusBadRequest, consts.ErrStandby.Error())
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}
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c.rekeyLock.Lock()
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defer c.rekeyLock.Unlock()
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// Copy the seal config if any
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var conf *SealConfig
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if recovery {
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if c.recoveryRekeyConfig != nil {
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conf = c.recoveryRekeyConfig.Clone()
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}
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} else {
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if c.barrierRekeyConfig != nil {
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conf = c.barrierRekeyConfig.Clone()
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}
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}
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return conf, nil
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}
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// RekeyInit will either initialize the rekey of barrier or recovery key.
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// recovery determines whether this is a rekey on the barrier or recovery key.
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func (c *Core) RekeyInit(config *SealConfig, recovery bool) logical.HTTPCodedError {
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if config.SecretThreshold > config.SecretShares {
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return logical.CodedError(http.StatusBadRequest, "provided threshold greater than the total shares")
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}
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if recovery {
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return c.RecoveryRekeyInit(config)
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}
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return c.BarrierRekeyInit(config)
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}
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// BarrierRekeyInit is used to initialize the rekey settings for the barrier key
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func (c *Core) BarrierRekeyInit(config *SealConfig) logical.HTTPCodedError {
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switch c.seal.BarrierType() {
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case wrapping.WrapperTypeShamir:
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// As of Vault 1.3 all seals use StoredShares==1. The one exception is
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// legacy shamir seals, which we can read but not write (by design).
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// So if someone does a rekey, regardless of their intention, we're going
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// to migrate them to a non-legacy Shamir seal.
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if config.StoredShares != 1 {
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c.logger.Warn("shamir stored keys supported, forcing rekey shares/threshold to 1")
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config.StoredShares = 1
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}
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default:
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if config.StoredShares != 1 {
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c.logger.Warn("stored keys supported, forcing rekey shares/threshold to 1")
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config.StoredShares = 1
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}
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config.SecretShares = 1
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config.SecretThreshold = 1
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if len(config.PGPKeys) > 0 {
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return logical.CodedError(http.StatusBadRequest, "PGP key encryption not supported when using stored keys")
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}
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if config.Backup {
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return logical.CodedError(http.StatusBadRequest, "key backup not supported when using stored keys")
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}
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}
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if c.seal.RecoveryKeySupported() {
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if config.VerificationRequired {
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return logical.CodedError(http.StatusBadRequest, "requiring verification not supported when rekeying the barrier key with recovery keys")
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}
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c.logger.Debug("using recovery seal configuration to rekey barrier key")
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}
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// Check if the seal configuration is valid
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if err := config.Validate(); err != nil {
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c.logger.Error("invalid rekey seal configuration", "error", err)
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return logical.CodedError(http.StatusInternalServerError, fmt.Errorf("invalid rekey seal configuration: %w", err).Error())
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}
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c.stateLock.RLock()
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defer c.stateLock.RUnlock()
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if c.Sealed() {
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return logical.CodedError(http.StatusServiceUnavailable, consts.ErrSealed.Error())
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}
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if c.standby {
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return logical.CodedError(http.StatusBadRequest, consts.ErrStandby.Error())
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}
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c.rekeyLock.Lock()
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defer c.rekeyLock.Unlock()
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// Prevent multiple concurrent re-keys
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if c.barrierRekeyConfig != nil {
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return logical.CodedError(http.StatusBadRequest, "rekey already in progress")
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}
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// Copy the configuration
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c.barrierRekeyConfig = config.Clone()
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// Initialize the nonce
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nonce, err := uuid.GenerateUUID()
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if err != nil {
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c.barrierRekeyConfig = nil
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return logical.CodedError(http.StatusInternalServerError, fmt.Errorf("error generating nonce for procedure: %w", err).Error())
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}
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c.barrierRekeyConfig.Nonce = nonce
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if c.logger.IsInfo() {
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c.logger.Info("rekey initialized", "nonce", c.barrierRekeyConfig.Nonce, "shares", c.barrierRekeyConfig.SecretShares, "threshold", c.barrierRekeyConfig.SecretThreshold, "validation_required", c.barrierRekeyConfig.VerificationRequired)
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}
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return nil
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}
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// RecoveryRekeyInit is used to initialize the rekey settings for the recovery key
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func (c *Core) RecoveryRekeyInit(config *SealConfig) logical.HTTPCodedError {
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if config.StoredShares > 0 {
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return logical.CodedError(http.StatusBadRequest, "stored shares not supported by recovery key")
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}
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// Check if the seal configuration is valid
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if err := config.Validate(); err != nil {
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c.logger.Error("invalid recovery configuration", "error", err)
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return logical.CodedError(http.StatusInternalServerError, fmt.Errorf("invalid recovery configuration: %w", err).Error())
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}
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if !c.seal.RecoveryKeySupported() {
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return logical.CodedError(http.StatusBadRequest, "recovery keys not supported")
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}
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c.stateLock.RLock()
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defer c.stateLock.RUnlock()
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if c.Sealed() {
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return logical.CodedError(http.StatusServiceUnavailable, consts.ErrSealed.Error())
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}
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if c.standby {
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return logical.CodedError(http.StatusBadRequest, consts.ErrStandby.Error())
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}
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c.rekeyLock.Lock()
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defer c.rekeyLock.Unlock()
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// Prevent multiple concurrent re-keys
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if c.recoveryRekeyConfig != nil {
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return logical.CodedError(http.StatusBadRequest, "rekey already in progress")
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}
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// Copy the configuration
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c.recoveryRekeyConfig = config.Clone()
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// Initialize the nonce
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nonce, err := uuid.GenerateUUID()
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if err != nil {
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c.recoveryRekeyConfig = nil
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return logical.CodedError(http.StatusInternalServerError, fmt.Errorf("error generating nonce for procedure: %w", err).Error())
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}
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c.recoveryRekeyConfig.Nonce = nonce
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if c.logger.IsInfo() {
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c.logger.Info("rekey initialized", "nonce", c.recoveryRekeyConfig.Nonce, "shares", c.recoveryRekeyConfig.SecretShares, "threshold", c.recoveryRekeyConfig.SecretThreshold, "validation_required", c.recoveryRekeyConfig.VerificationRequired)
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}
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return nil
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}
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// RekeyUpdate is used to provide a new key part for the barrier or recovery key.
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func (c *Core) RekeyUpdate(ctx context.Context, key []byte, nonce string, recovery bool) (*RekeyResult, logical.HTTPCodedError) {
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if recovery {
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return c.RecoveryRekeyUpdate(ctx, key, nonce)
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}
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return c.BarrierRekeyUpdate(ctx, key, nonce)
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}
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// BarrierRekeyUpdate is used to provide a new key part. Barrier rekey can be done
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// with unseal keys, or recovery keys if that's supported and we are storing the barrier
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// key.
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//
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// N.B.: If recovery keys are used to rekey, the new barrier key shares are not returned.
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func (c *Core) BarrierRekeyUpdate(ctx context.Context, key []byte, nonce string) (*RekeyResult, logical.HTTPCodedError) {
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// Ensure we are already unsealed
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c.stateLock.RLock()
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defer c.stateLock.RUnlock()
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if c.Sealed() {
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return nil, logical.CodedError(http.StatusServiceUnavailable, consts.ErrSealed.Error())
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}
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if c.standby {
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return nil, logical.CodedError(http.StatusBadRequest, consts.ErrStandby.Error())
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}
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// Verify the key length
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min, max := c.barrier.KeyLength()
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max += shamir.ShareOverhead
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if len(key) < min {
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return nil, logical.CodedError(http.StatusBadRequest, fmt.Sprintf("key is shorter than minimum %d bytes", min))
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}
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if len(key) > max {
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return nil, logical.CodedError(http.StatusBadRequest, fmt.Sprintf("key is longer than maximum %d bytes", max))
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}
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c.rekeyLock.Lock()
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defer c.rekeyLock.Unlock()
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// Get the seal configuration
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var existingConfig *SealConfig
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var err error
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var useRecovery bool // Determines whether recovery key is being used to rekey the root key
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if c.seal.StoredKeysSupported() == seal.StoredKeysSupportedGeneric && c.seal.RecoveryKeySupported() {
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existingConfig, err = c.seal.RecoveryConfig(ctx)
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useRecovery = true
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} else {
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existingConfig, err = c.seal.BarrierConfig(ctx)
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}
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if err != nil {
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return nil, logical.CodedError(http.StatusInternalServerError, fmt.Errorf("failed to fetch existing config: %w", err).Error())
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}
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// Ensure the barrier is initialized
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if existingConfig == nil {
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return nil, logical.CodedError(http.StatusBadRequest, ErrNotInit.Error())
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}
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// Ensure a rekey is in progress
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if c.barrierRekeyConfig == nil {
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return nil, logical.CodedError(http.StatusBadRequest, "no barrier rekey in progress")
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}
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if len(c.barrierRekeyConfig.VerificationKey) > 0 {
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return nil, logical.CodedError(http.StatusBadRequest, fmt.Sprintf("rekey operation already finished; verification must be performed; nonce for the verification operation is %q", c.barrierRekeyConfig.VerificationNonce))
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}
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if nonce != c.barrierRekeyConfig.Nonce {
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return nil, logical.CodedError(http.StatusBadRequest, fmt.Sprintf("incorrect nonce supplied; nonce for this rekey operation is %q", c.barrierRekeyConfig.Nonce))
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}
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// Check if we already have this piece
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for _, existing := range c.barrierRekeyConfig.RekeyProgress {
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if subtle.ConstantTimeCompare(existing, key) == 1 {
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return nil, logical.CodedError(http.StatusBadRequest, "given key has already been provided during this generation operation")
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}
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}
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// Store this key
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c.barrierRekeyConfig.RekeyProgress = append(c.barrierRekeyConfig.RekeyProgress, key)
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// Check if we don't have enough keys to unlock
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if len(c.barrierRekeyConfig.RekeyProgress) < existingConfig.SecretThreshold {
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if c.logger.IsDebug() {
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c.logger.Debug("cannot rekey yet, not enough keys", "keys", len(c.barrierRekeyConfig.RekeyProgress), "threshold", existingConfig.SecretThreshold)
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}
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return nil, nil
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}
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// Recover the root key or recovery key
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var recoveredKey []byte
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if existingConfig.SecretThreshold == 1 {
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recoveredKey = c.barrierRekeyConfig.RekeyProgress[0]
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c.barrierRekeyConfig.RekeyProgress = nil
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} else {
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recoveredKey, err = shamir.Combine(c.barrierRekeyConfig.RekeyProgress)
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c.barrierRekeyConfig.RekeyProgress = nil
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if err != nil {
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return nil, logical.CodedError(http.StatusInternalServerError, fmt.Errorf("failed to compute root key: %w", err).Error())
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}
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}
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switch {
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case useRecovery:
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if err := c.seal.VerifyRecoveryKey(ctx, recoveredKey); err != nil {
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c.logger.Error("rekey recovery key verification failed", "error", err)
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return nil, logical.CodedError(http.StatusBadRequest, fmt.Errorf("recovery key verification failed: %w", err).Error())
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}
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case c.seal.BarrierType() == wrapping.WrapperTypeShamir:
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if c.seal.StoredKeysSupported() == seal.StoredKeysSupportedShamirRoot {
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testseal := NewDefaultSeal(&seal.Access{
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Wrapper: aeadwrapper.NewShamirWrapper(),
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})
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testseal.SetCore(c)
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err = testseal.GetAccess().Wrapper.(*aeadwrapper.ShamirWrapper).SetAesGcmKeyBytes(recoveredKey)
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if err != nil {
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return nil, logical.CodedError(http.StatusInternalServerError, fmt.Errorf("failed to setup unseal key: %w", err).Error())
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}
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cfg, err := c.seal.BarrierConfig(ctx)
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if err != nil {
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return nil, logical.CodedError(http.StatusInternalServerError, fmt.Errorf("failed to setup test barrier config: %w", err).Error())
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}
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testseal.SetCachedBarrierConfig(cfg)
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stored, err := testseal.GetStoredKeys(ctx)
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if err != nil {
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return nil, logical.CodedError(http.StatusInternalServerError, fmt.Errorf("failed to read root key: %w", err).Error())
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}
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recoveredKey = stored[0]
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}
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if err := c.barrier.VerifyRoot(recoveredKey); err != nil {
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c.logger.Error("root key verification failed", "error", err)
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return nil, logical.CodedError(http.StatusBadRequest, fmt.Errorf("rootter key verification failed: %w", err).Error())
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}
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}
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// Generate a new key: for AutoUnseal, this is a new root key; for Shamir,
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// this is a new unseal key, and performBarrierRekey will also generate a
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// new root key.
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newKey, err := c.barrier.GenerateKey(c.secureRandomReader)
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if err != nil {
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c.logger.Error("failed to generate root key", "error", err)
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return nil, logical.CodedError(http.StatusInternalServerError, fmt.Errorf("root key generation failed: %w", err).Error())
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}
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results := &RekeyResult{
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Backup: c.barrierRekeyConfig.Backup,
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}
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if c.seal.StoredKeysSupported() != seal.StoredKeysSupportedGeneric {
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// Set result.SecretShares to the new key itself if only a single key
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// part is used -- no Shamir split required.
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if c.barrierRekeyConfig.SecretShares == 1 {
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results.SecretShares = append(results.SecretShares, newKey)
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} else {
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// Split the new key using the Shamir algorithm
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shares, err := shamir.Split(newKey, c.barrierRekeyConfig.SecretShares, c.barrierRekeyConfig.SecretThreshold)
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if err != nil {
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c.logger.Error("failed to generate shares", "error", err)
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return nil, logical.CodedError(http.StatusInternalServerError, fmt.Errorf("failed to generate shares: %w", err).Error())
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}
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results.SecretShares = shares
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}
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}
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|
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// If PGP keys are passed in, encrypt shares with corresponding PGP keys.
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if len(c.barrierRekeyConfig.PGPKeys) > 0 {
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hexEncodedShares := make([][]byte, len(results.SecretShares))
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for i := range results.SecretShares {
|
|
hexEncodedShares[i] = []byte(hex.EncodeToString(results.SecretShares[i]))
|
|
}
|
|
results.PGPFingerprints, results.SecretShares, err = pgpkeys.EncryptShares(hexEncodedShares, c.barrierRekeyConfig.PGPKeys)
|
|
if err != nil {
|
|
return nil, logical.CodedError(http.StatusInternalServerError, fmt.Errorf("failed to encrypt shares: %w", err).Error())
|
|
}
|
|
|
|
// If backup is enabled, store backup info in vault.coreBarrierUnsealKeysBackupPath
|
|
if c.barrierRekeyConfig.Backup {
|
|
backupInfo := map[string][]string{}
|
|
for i := 0; i < len(results.PGPFingerprints); i++ {
|
|
encShare := bytes.NewBuffer(results.SecretShares[i])
|
|
if backupInfo[results.PGPFingerprints[i]] == nil {
|
|
backupInfo[results.PGPFingerprints[i]] = []string{hex.EncodeToString(encShare.Bytes())}
|
|
} else {
|
|
backupInfo[results.PGPFingerprints[i]] = append(backupInfo[results.PGPFingerprints[i]], hex.EncodeToString(encShare.Bytes()))
|
|
}
|
|
}
|
|
|
|
backupVals := &RekeyBackup{
|
|
Nonce: c.barrierRekeyConfig.Nonce,
|
|
Keys: backupInfo,
|
|
}
|
|
buf, err := json.Marshal(backupVals)
|
|
if err != nil {
|
|
c.logger.Error("failed to marshal unseal key backup", "error", err)
|
|
return nil, logical.CodedError(http.StatusInternalServerError, fmt.Errorf("failed to marshal unseal key backup: %w", err).Error())
|
|
}
|
|
pe := &physical.Entry{
|
|
Key: coreBarrierUnsealKeysBackupPath,
|
|
Value: buf,
|
|
}
|
|
if err = c.physical.Put(ctx, pe); err != nil {
|
|
c.logger.Error("failed to save unseal key backup", "error", err)
|
|
return nil, logical.CodedError(http.StatusInternalServerError, fmt.Errorf("failed to save unseal key backup: %w", err).Error())
|
|
}
|
|
}
|
|
}
|
|
|
|
// If we are requiring validation, return now; otherwise rekey the barrier
|
|
if c.barrierRekeyConfig.VerificationRequired {
|
|
nonce, err := uuid.GenerateUUID()
|
|
if err != nil {
|
|
c.barrierRekeyConfig = nil
|
|
return nil, logical.CodedError(http.StatusInternalServerError, fmt.Errorf("failed to generate verification nonce: %w", err).Error())
|
|
}
|
|
c.barrierRekeyConfig.VerificationNonce = nonce
|
|
c.barrierRekeyConfig.VerificationKey = newKey
|
|
|
|
results.VerificationRequired = true
|
|
results.VerificationNonce = nonce
|
|
return results, nil
|
|
}
|
|
|
|
if err := c.performBarrierRekey(ctx, newKey); err != nil {
|
|
return nil, logical.CodedError(http.StatusInternalServerError, fmt.Errorf("failed to perform barrier rekey: %w", err).Error())
|
|
}
|
|
|
|
c.barrierRekeyConfig = nil
|
|
return results, nil
|
|
}
|
|
|
|
func (c *Core) performBarrierRekey(ctx context.Context, newSealKey []byte) logical.HTTPCodedError {
|
|
legacyUpgrade := c.seal.StoredKeysSupported() == seal.StoredKeysNotSupported
|
|
if legacyUpgrade {
|
|
// We won't be able to call SetStoredKeys without setting StoredShares=1.
|
|
existingConfig, err := c.seal.BarrierConfig(ctx)
|
|
if err != nil {
|
|
return logical.CodedError(http.StatusInternalServerError, fmt.Errorf("failed to fetch existing config: %w", err).Error())
|
|
}
|
|
existingConfig.StoredShares = 1
|
|
c.seal.SetCachedBarrierConfig(existingConfig)
|
|
}
|
|
|
|
if c.seal.StoredKeysSupported() != seal.StoredKeysSupportedGeneric {
|
|
err := c.seal.GetAccess().Wrapper.(*aeadwrapper.ShamirWrapper).SetAesGcmKeyBytes(newSealKey)
|
|
if err != nil {
|
|
return logical.CodedError(http.StatusInternalServerError, fmt.Errorf("failed to update barrier seal key: %w", err).Error())
|
|
}
|
|
}
|
|
|
|
newRootKey, err := c.barrier.GenerateKey(c.secureRandomReader)
|
|
if err != nil {
|
|
return logical.CodedError(http.StatusInternalServerError, fmt.Errorf("failed to perform rekey: %w", err).Error())
|
|
}
|
|
if err := c.seal.SetStoredKeys(ctx, [][]byte{newRootKey}); err != nil {
|
|
c.logger.Error("failed to store keys", "error", err)
|
|
return logical.CodedError(http.StatusInternalServerError, fmt.Errorf("failed to store keys: %w", err).Error())
|
|
}
|
|
|
|
// Rekey the barrier
|
|
if err := c.barrier.Rekey(ctx, newRootKey); err != nil {
|
|
c.logger.Error("failed to rekey barrier", "error", err)
|
|
return logical.CodedError(http.StatusInternalServerError, fmt.Errorf("failed to rekey barrier: %w", err).Error())
|
|
}
|
|
if c.logger.IsInfo() {
|
|
c.logger.Info("security barrier rekeyed", "stored", c.barrierRekeyConfig.StoredShares, "shares", c.barrierRekeyConfig.SecretShares, "threshold", c.barrierRekeyConfig.SecretThreshold)
|
|
}
|
|
|
|
if len(newSealKey) > 0 {
|
|
err := c.barrier.Put(ctx, &logical.StorageEntry{
|
|
Key: shamirKekPath,
|
|
Value: newSealKey,
|
|
})
|
|
if err != nil {
|
|
c.logger.Error("failed to store new seal key", "error", err)
|
|
return logical.CodedError(http.StatusInternalServerError, fmt.Errorf("failed to store new seal key: %w", err).Error())
|
|
}
|
|
}
|
|
|
|
c.barrierRekeyConfig.VerificationKey = nil
|
|
|
|
if err := c.seal.SetBarrierConfig(ctx, c.barrierRekeyConfig); err != nil {
|
|
c.logger.Error("error saving rekey seal configuration", "error", err)
|
|
return logical.CodedError(http.StatusInternalServerError, fmt.Errorf("failed to save rekey seal configuration: %w", err).Error())
|
|
}
|
|
|
|
// Write to the canary path, which will force a synchronous truing during
|
|
// replication
|
|
if err := c.barrier.Put(ctx, &logical.StorageEntry{
|
|
Key: coreKeyringCanaryPath,
|
|
Value: []byte(c.barrierRekeyConfig.Nonce),
|
|
}); err != nil {
|
|
c.logger.Error("error saving keyring canary", "error", err)
|
|
return logical.CodedError(http.StatusInternalServerError, fmt.Errorf("failed to save keyring canary: %w", err).Error())
|
|
}
|
|
|
|
c.barrierRekeyConfig.RekeyProgress = nil
|
|
|
|
return nil
|
|
}
|
|
|
|
// RecoveryRekeyUpdate is used to provide a new key part
|
|
func (c *Core) RecoveryRekeyUpdate(ctx context.Context, key []byte, nonce string) (*RekeyResult, logical.HTTPCodedError) {
|
|
// Ensure we are already unsealed
|
|
c.stateLock.RLock()
|
|
defer c.stateLock.RUnlock()
|
|
if c.Sealed() {
|
|
return nil, logical.CodedError(http.StatusServiceUnavailable, consts.ErrSealed.Error())
|
|
}
|
|
if c.standby {
|
|
return nil, logical.CodedError(http.StatusBadRequest, consts.ErrStandby.Error())
|
|
}
|
|
|
|
// Verify the key length
|
|
min, max := c.barrier.KeyLength()
|
|
max += shamir.ShareOverhead
|
|
if len(key) < min {
|
|
return nil, logical.CodedError(http.StatusBadRequest, fmt.Sprintf("key is shorter than minimum %d bytes", min))
|
|
}
|
|
if len(key) > max {
|
|
return nil, logical.CodedError(http.StatusBadRequest, fmt.Sprintf("key is longer than maximum %d bytes", max))
|
|
}
|
|
|
|
c.rekeyLock.Lock()
|
|
defer c.rekeyLock.Unlock()
|
|
|
|
// Get the seal configuration
|
|
existingConfig, err := c.seal.RecoveryConfig(ctx)
|
|
if err != nil {
|
|
return nil, logical.CodedError(http.StatusInternalServerError, fmt.Errorf("failed to fetch existing recovery config: %w", err).Error())
|
|
}
|
|
// Ensure the seal is initialized
|
|
if existingConfig == nil {
|
|
return nil, logical.CodedError(http.StatusBadRequest, ErrNotInit.Error())
|
|
}
|
|
|
|
// Ensure a rekey is in progress
|
|
if c.recoveryRekeyConfig == nil {
|
|
return nil, logical.CodedError(http.StatusBadRequest, "no recovery rekey in progress")
|
|
}
|
|
|
|
if len(c.recoveryRekeyConfig.VerificationKey) > 0 {
|
|
return nil, logical.CodedError(http.StatusBadRequest, fmt.Sprintf("rekey operation already finished; verification must be performed; nonce for the verification operation is %q", c.recoveryRekeyConfig.VerificationNonce))
|
|
}
|
|
|
|
if nonce != c.recoveryRekeyConfig.Nonce {
|
|
return nil, logical.CodedError(http.StatusBadRequest, fmt.Sprintf("incorrect nonce supplied; nonce for this rekey operation is %q", c.recoveryRekeyConfig.Nonce))
|
|
}
|
|
|
|
// Check if we already have this piece
|
|
for _, existing := range c.recoveryRekeyConfig.RekeyProgress {
|
|
if subtle.ConstantTimeCompare(existing, key) == 1 {
|
|
return nil, logical.CodedError(http.StatusBadRequest, "given key has already been provided during this rekey operation")
|
|
}
|
|
}
|
|
|
|
// Store this key
|
|
c.recoveryRekeyConfig.RekeyProgress = append(c.recoveryRekeyConfig.RekeyProgress, key)
|
|
|
|
// Check if we don't have enough keys to unlock
|
|
if len(c.recoveryRekeyConfig.RekeyProgress) < existingConfig.SecretThreshold {
|
|
if c.logger.IsDebug() {
|
|
c.logger.Debug("cannot rekey yet, not enough keys", "keys", len(c.recoveryRekeyConfig.RekeyProgress), "threshold", existingConfig.SecretThreshold)
|
|
}
|
|
return nil, nil
|
|
}
|
|
|
|
// Recover the root key
|
|
var recoveryKey []byte
|
|
if existingConfig.SecretThreshold == 1 {
|
|
recoveryKey = c.recoveryRekeyConfig.RekeyProgress[0]
|
|
c.recoveryRekeyConfig.RekeyProgress = nil
|
|
} else {
|
|
recoveryKey, err = shamir.Combine(c.recoveryRekeyConfig.RekeyProgress)
|
|
c.recoveryRekeyConfig.RekeyProgress = nil
|
|
if err != nil {
|
|
return nil, logical.CodedError(http.StatusInternalServerError, fmt.Errorf("failed to compute recovery key: %w", err).Error())
|
|
}
|
|
}
|
|
|
|
// Verify the recovery key
|
|
if err := c.seal.VerifyRecoveryKey(ctx, recoveryKey); err != nil {
|
|
c.logger.Error("recovery key verification failed", "error", err)
|
|
return nil, logical.CodedError(http.StatusBadRequest, fmt.Errorf("recovery key verification failed: %w", err).Error())
|
|
}
|
|
|
|
// Generate a new root key
|
|
newRecoveryKey, err := c.barrier.GenerateKey(c.secureRandomReader)
|
|
if err != nil {
|
|
c.logger.Error("failed to generate recovery key", "error", err)
|
|
return nil, logical.CodedError(http.StatusInternalServerError, fmt.Errorf("recovery key generation failed: %w", err).Error())
|
|
}
|
|
|
|
// Return the root key if only a single key part is used
|
|
results := &RekeyResult{
|
|
Backup: c.recoveryRekeyConfig.Backup,
|
|
}
|
|
|
|
if c.recoveryRekeyConfig.SecretShares == 1 {
|
|
results.SecretShares = append(results.SecretShares, newRecoveryKey)
|
|
} else {
|
|
// Split the root key using the Shamir algorithm
|
|
shares, err := shamir.Split(newRecoveryKey, c.recoveryRekeyConfig.SecretShares, c.recoveryRekeyConfig.SecretThreshold)
|
|
if err != nil {
|
|
c.logger.Error("failed to generate shares", "error", err)
|
|
return nil, logical.CodedError(http.StatusInternalServerError, fmt.Errorf("failed to generate shares: %w", err).Error())
|
|
}
|
|
results.SecretShares = shares
|
|
}
|
|
|
|
if len(c.recoveryRekeyConfig.PGPKeys) > 0 {
|
|
hexEncodedShares := make([][]byte, len(results.SecretShares))
|
|
for i := range results.SecretShares {
|
|
hexEncodedShares[i] = []byte(hex.EncodeToString(results.SecretShares[i]))
|
|
}
|
|
results.PGPFingerprints, results.SecretShares, err = pgpkeys.EncryptShares(hexEncodedShares, c.recoveryRekeyConfig.PGPKeys)
|
|
if err != nil {
|
|
return nil, logical.CodedError(http.StatusInternalServerError, fmt.Errorf("failed to encrypt shares: %w", err).Error())
|
|
}
|
|
|
|
if c.recoveryRekeyConfig.Backup {
|
|
backupInfo := map[string][]string{}
|
|
for i := 0; i < len(results.PGPFingerprints); i++ {
|
|
encShare := bytes.NewBuffer(results.SecretShares[i])
|
|
if backupInfo[results.PGPFingerprints[i]] == nil {
|
|
backupInfo[results.PGPFingerprints[i]] = []string{hex.EncodeToString(encShare.Bytes())}
|
|
} else {
|
|
backupInfo[results.PGPFingerprints[i]] = append(backupInfo[results.PGPFingerprints[i]], hex.EncodeToString(encShare.Bytes()))
|
|
}
|
|
}
|
|
|
|
backupVals := &RekeyBackup{
|
|
Nonce: c.recoveryRekeyConfig.Nonce,
|
|
Keys: backupInfo,
|
|
}
|
|
buf, err := json.Marshal(backupVals)
|
|
if err != nil {
|
|
c.logger.Error("failed to marshal recovery key backup", "error", err)
|
|
return nil, logical.CodedError(http.StatusInternalServerError, fmt.Errorf("failed to marshal recovery key backup: %w", err).Error())
|
|
}
|
|
pe := &physical.Entry{
|
|
Key: coreRecoveryUnsealKeysBackupPath,
|
|
Value: buf,
|
|
}
|
|
if err = c.physical.Put(ctx, pe); err != nil {
|
|
c.logger.Error("failed to save unseal key backup", "error", err)
|
|
return nil, logical.CodedError(http.StatusInternalServerError, fmt.Errorf("failed to save unseal key backup: %w", err).Error())
|
|
}
|
|
}
|
|
}
|
|
|
|
// If we are requiring validation, return now; otherwise save the recovery
|
|
// key
|
|
if c.recoveryRekeyConfig.VerificationRequired {
|
|
nonce, err := uuid.GenerateUUID()
|
|
if err != nil {
|
|
c.recoveryRekeyConfig = nil
|
|
return nil, logical.CodedError(http.StatusInternalServerError, fmt.Errorf("failed to generate verification nonce: %w", err).Error())
|
|
}
|
|
c.recoveryRekeyConfig.VerificationNonce = nonce
|
|
c.recoveryRekeyConfig.VerificationKey = newRecoveryKey
|
|
|
|
results.VerificationRequired = true
|
|
results.VerificationNonce = nonce
|
|
return results, nil
|
|
}
|
|
|
|
if err := c.performRecoveryRekey(ctx, newRecoveryKey); err != nil {
|
|
return nil, logical.CodedError(http.StatusInternalServerError, fmt.Errorf("failed to perform recovery rekey: %w", err).Error())
|
|
}
|
|
|
|
c.recoveryRekeyConfig = nil
|
|
return results, nil
|
|
}
|
|
|
|
func (c *Core) performRecoveryRekey(ctx context.Context, newRootKey []byte) logical.HTTPCodedError {
|
|
if err := c.seal.SetRecoveryKey(ctx, newRootKey); err != nil {
|
|
c.logger.Error("failed to set recovery key", "error", err)
|
|
return logical.CodedError(http.StatusInternalServerError, fmt.Errorf("failed to set recovery key: %w", err).Error())
|
|
}
|
|
|
|
c.recoveryRekeyConfig.VerificationKey = nil
|
|
|
|
if err := c.seal.SetRecoveryConfig(ctx, c.recoveryRekeyConfig); err != nil {
|
|
c.logger.Error("error saving rekey seal configuration", "error", err)
|
|
return logical.CodedError(http.StatusInternalServerError, fmt.Errorf("failed to save rekey seal configuration: %w", err).Error())
|
|
}
|
|
|
|
// Write to the canary path, which will force a synchronous truing during
|
|
// replication
|
|
if err := c.barrier.Put(ctx, &logical.StorageEntry{
|
|
Key: coreKeyringCanaryPath,
|
|
Value: []byte(c.recoveryRekeyConfig.Nonce),
|
|
}); err != nil {
|
|
c.logger.Error("error saving keyring canary", "error", err)
|
|
return logical.CodedError(http.StatusInternalServerError, fmt.Errorf("failed to save keyring canary: %w", err).Error())
|
|
}
|
|
|
|
c.recoveryRekeyConfig.RekeyProgress = nil
|
|
|
|
return nil
|
|
}
|
|
|
|
func (c *Core) RekeyVerify(ctx context.Context, key []byte, nonce string, recovery bool) (ret *RekeyVerifyResult, retErr logical.HTTPCodedError) {
|
|
// Ensure we are already unsealed
|
|
c.stateLock.RLock()
|
|
defer c.stateLock.RUnlock()
|
|
if c.Sealed() {
|
|
return nil, logical.CodedError(http.StatusServiceUnavailable, consts.ErrSealed.Error())
|
|
}
|
|
if c.standby {
|
|
return nil, logical.CodedError(http.StatusBadRequest, consts.ErrStandby.Error())
|
|
}
|
|
|
|
// Verify the key length
|
|
min, max := c.barrier.KeyLength()
|
|
max += shamir.ShareOverhead
|
|
if len(key) < min {
|
|
return nil, logical.CodedError(http.StatusBadRequest, fmt.Sprintf("key is shorter than minimum %d bytes", min))
|
|
}
|
|
if len(key) > max {
|
|
return nil, logical.CodedError(http.StatusBadRequest, fmt.Sprintf("key is longer than maximum %d bytes", max))
|
|
}
|
|
|
|
c.rekeyLock.Lock()
|
|
defer c.rekeyLock.Unlock()
|
|
|
|
config := c.barrierRekeyConfig
|
|
if recovery {
|
|
config = c.recoveryRekeyConfig
|
|
}
|
|
|
|
// Ensure a rekey is in progress
|
|
if config == nil {
|
|
return nil, logical.CodedError(http.StatusBadRequest, "no rekey in progress")
|
|
}
|
|
|
|
if len(config.VerificationKey) == 0 {
|
|
return nil, logical.CodedError(http.StatusBadRequest, "no rekey verification in progress")
|
|
}
|
|
|
|
if nonce != config.VerificationNonce {
|
|
return nil, logical.CodedError(http.StatusBadRequest, fmt.Sprintf("incorrect nonce supplied; nonce for this verify operation is %q", config.VerificationNonce))
|
|
}
|
|
|
|
// Check if we already have this piece
|
|
for _, existing := range config.VerificationProgress {
|
|
if subtle.ConstantTimeCompare(existing, key) == 1 {
|
|
return nil, logical.CodedError(http.StatusBadRequest, "given key has already been provided during this verify operation")
|
|
}
|
|
}
|
|
|
|
// Store this key
|
|
config.VerificationProgress = append(config.VerificationProgress, key)
|
|
|
|
// Check if we don't have enough keys to unlock
|
|
if len(config.VerificationProgress) < config.SecretThreshold {
|
|
if c.logger.IsDebug() {
|
|
c.logger.Debug("cannot verify yet, not enough keys", "keys", len(config.VerificationProgress), "threshold", config.SecretThreshold)
|
|
}
|
|
return nil, nil
|
|
}
|
|
|
|
// Schedule the progress for forgetting and rotate the nonce if possible
|
|
defer func() {
|
|
config.VerificationProgress = nil
|
|
if ret != nil && ret.Complete {
|
|
return
|
|
}
|
|
// Not complete, so rotate nonce
|
|
nonce, err := uuid.GenerateUUID()
|
|
if err == nil {
|
|
config.VerificationNonce = nonce
|
|
if ret != nil {
|
|
ret.Nonce = nonce
|
|
}
|
|
}
|
|
}()
|
|
|
|
// Recover the root key or recovery key
|
|
var recoveredKey []byte
|
|
if config.SecretThreshold == 1 {
|
|
recoveredKey = config.VerificationProgress[0]
|
|
} else {
|
|
var err error
|
|
recoveredKey, err = shamir.Combine(config.VerificationProgress)
|
|
if err != nil {
|
|
return nil, logical.CodedError(http.StatusInternalServerError, fmt.Errorf("failed to compute key for verification: %w", err).Error())
|
|
}
|
|
}
|
|
|
|
if subtle.ConstantTimeCompare(recoveredKey, config.VerificationKey) != 1 {
|
|
c.logger.Error("rekey verification failed")
|
|
return nil, logical.CodedError(http.StatusBadRequest, "rekey verification failed; incorrect key shares supplied")
|
|
}
|
|
|
|
switch recovery {
|
|
case false:
|
|
if err := c.performBarrierRekey(ctx, recoveredKey); err != nil {
|
|
return nil, logical.CodedError(http.StatusInternalServerError, fmt.Errorf("failed to perform rekey: %w", err).Error())
|
|
}
|
|
c.barrierRekeyConfig = nil
|
|
default:
|
|
if err := c.performRecoveryRekey(ctx, recoveredKey); err != nil {
|
|
return nil, logical.CodedError(http.StatusInternalServerError, fmt.Errorf("failed to perform recovery key rekey: %w", err).Error())
|
|
}
|
|
c.recoveryRekeyConfig = nil
|
|
}
|
|
|
|
res := &RekeyVerifyResult{
|
|
Nonce: config.VerificationNonce,
|
|
Complete: true,
|
|
}
|
|
|
|
return res, nil
|
|
}
|
|
|
|
// RekeyCancel is used to cancel an in-progress rekey
|
|
func (c *Core) RekeyCancel(recovery bool) logical.HTTPCodedError {
|
|
c.stateLock.RLock()
|
|
defer c.stateLock.RUnlock()
|
|
if c.Sealed() {
|
|
return logical.CodedError(http.StatusServiceUnavailable, consts.ErrSealed.Error())
|
|
}
|
|
if c.standby {
|
|
return logical.CodedError(http.StatusBadRequest, consts.ErrStandby.Error())
|
|
}
|
|
|
|
c.rekeyLock.Lock()
|
|
defer c.rekeyLock.Unlock()
|
|
|
|
// Clear any progress or config
|
|
if recovery {
|
|
c.recoveryRekeyConfig = nil
|
|
} else {
|
|
c.barrierRekeyConfig = nil
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// RekeyVerifyRestart is used to start the verification process over
|
|
func (c *Core) RekeyVerifyRestart(recovery bool) logical.HTTPCodedError {
|
|
c.stateLock.RLock()
|
|
defer c.stateLock.RUnlock()
|
|
if c.Sealed() {
|
|
return logical.CodedError(http.StatusServiceUnavailable, consts.ErrSealed.Error())
|
|
}
|
|
if c.standby {
|
|
return logical.CodedError(http.StatusBadRequest, consts.ErrStandby.Error())
|
|
}
|
|
|
|
c.rekeyLock.Lock()
|
|
defer c.rekeyLock.Unlock()
|
|
|
|
// Attempt to generate a new nonce, but don't bail if it doesn't succeed
|
|
// (which is extraordinarily unlikely)
|
|
nonce, nonceErr := uuid.GenerateUUID()
|
|
|
|
// Clear any progress or config
|
|
if recovery {
|
|
if c.recoveryRekeyConfig != nil {
|
|
c.recoveryRekeyConfig.VerificationProgress = nil
|
|
if nonceErr == nil {
|
|
c.recoveryRekeyConfig.VerificationNonce = nonce
|
|
}
|
|
}
|
|
} else {
|
|
if c.barrierRekeyConfig != nil {
|
|
c.barrierRekeyConfig.VerificationProgress = nil
|
|
if nonceErr == nil {
|
|
c.barrierRekeyConfig.VerificationNonce = nonce
|
|
}
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
// RekeyRetrieveBackup is used to retrieve any backed-up PGP-encrypted unseal
|
|
// keys
|
|
func (c *Core) RekeyRetrieveBackup(ctx context.Context, recovery bool) (*RekeyBackup, logical.HTTPCodedError) {
|
|
if c.Sealed() {
|
|
return nil, logical.CodedError(http.StatusServiceUnavailable, consts.ErrSealed.Error())
|
|
}
|
|
if c.standby {
|
|
return nil, logical.CodedError(http.StatusBadRequest, consts.ErrStandby.Error())
|
|
}
|
|
|
|
c.rekeyLock.RLock()
|
|
defer c.rekeyLock.RUnlock()
|
|
|
|
var entry *physical.Entry
|
|
var err error
|
|
if recovery {
|
|
entry, err = c.physical.Get(ctx, coreRecoveryUnsealKeysBackupPath)
|
|
} else {
|
|
entry, err = c.physical.Get(ctx, coreBarrierUnsealKeysBackupPath)
|
|
}
|
|
if err != nil {
|
|
return nil, logical.CodedError(http.StatusInternalServerError, fmt.Errorf("error getting keys from backup: %w", err).Error())
|
|
}
|
|
if entry == nil {
|
|
return nil, nil
|
|
}
|
|
|
|
ret := &RekeyBackup{}
|
|
err = jsonutil.DecodeJSON(entry.Value, ret)
|
|
if err != nil {
|
|
return nil, logical.CodedError(http.StatusInternalServerError, fmt.Errorf("error decoding backup keys: %w", err).Error())
|
|
}
|
|
|
|
return ret, nil
|
|
}
|
|
|
|
// RekeyDeleteBackup is used to delete any backed-up PGP-encrypted unseal keys
|
|
func (c *Core) RekeyDeleteBackup(ctx context.Context, recovery bool) logical.HTTPCodedError {
|
|
if c.Sealed() {
|
|
return logical.CodedError(http.StatusServiceUnavailable, consts.ErrSealed.Error())
|
|
}
|
|
if c.standby {
|
|
return logical.CodedError(http.StatusBadRequest, consts.ErrStandby.Error())
|
|
}
|
|
|
|
c.rekeyLock.Lock()
|
|
defer c.rekeyLock.Unlock()
|
|
|
|
if recovery {
|
|
err := c.physical.Delete(ctx, coreRecoveryUnsealKeysBackupPath)
|
|
if err != nil {
|
|
return logical.CodedError(http.StatusInternalServerError, fmt.Errorf("error deleting backup keys: %w", err).Error())
|
|
}
|
|
return nil
|
|
}
|
|
err := c.physical.Delete(ctx, coreBarrierUnsealKeysBackupPath)
|
|
if err != nil {
|
|
return logical.CodedError(http.StatusInternalServerError, fmt.Errorf("error deleting backup keys: %w", err).Error())
|
|
}
|
|
return nil
|
|
}
|