func (c *Core) generateShares(sc *SealConfig) ([]byte, [][]byte, error) {
// Generate a master key
masterKey, err := c.barrier.GenerateKey()
if err != nil {
return nil, nil, fmt.Errorf("key generation failed: %v", err)
}
// Return the master key if only a single key part is used
var unsealKeys [][]byte
if sc.SecretShares == 1 {
unsealKeys = append(unsealKeys, masterKey)
} else {
// Split the master key using the Shamir algorithm
shares, err := shamir.Split(masterKey, sc.SecretShares, sc.SecretThreshold)
if err != nil {
return nil, nil, fmt.Errorf("failed to generate shares: %v", err)
}
unsealKeys = shares
}
// If we have PGP keys, perform the encryption
if len(sc.PGPKeys) > 0 {
hexEncodedShares := make([][]byte, len(unsealKeys))
for i, _ := range unsealKeys {
hexEncodedShares[i] = []byte(hex.EncodeToString(unsealKeys[i]))
}
_, encryptedShares, err := pgpkeys.EncryptShares(hexEncodedShares, sc.PGPKeys)
if err != nil {
return nil, nil, err
}
unsealKeys = encryptedShares
}
return masterKey, unsealKeys, nil
}
// Initialize is used to initialize the Vault with the given
// configurations.
func (c *Core) Initialize(config *SealConfig) (*InitResult, error) {
// Check if the seal configuraiton is valid
if err := config.Validate(); err != nil {
c.logger.Printf("[ERR] core: invalid seal configuration: %v", err)
return nil, fmt.Errorf("invalid seal configuration: %v", err)
}
// Avoid an initialization race
c.stateLock.Lock()
defer c.stateLock.Unlock()
// Check if we are initialized
init, err := c.Initialized()
if err != nil {
return nil, err
}
if init {
return nil, ErrAlreadyInit
}
// Encode the seal configuration
buf, err := json.Marshal(config)
if err != nil {
return nil, fmt.Errorf("failed to encode seal configuration: %v", err)
}
// Store the seal configuration
pe := &physical.Entry{
Key: coreSealConfigPath,
Value: buf,
}
if err := c.physical.Put(pe); err != nil {
c.logger.Printf("[ERR] core: failed to write seal configuration: %v", err)
return nil, fmt.Errorf("failed to write seal configuration: %v", err)
}
// Generate a master key
masterKey, err := c.barrier.GenerateKey()
if err != nil {
c.logger.Printf("[ERR] core: failed to generate master key: %v", err)
return nil, fmt.Errorf("master key generation failed: %v", err)
}
// Return the master key if only a single key part is used
results := new(InitResult)
if config.SecretShares == 1 {
results.SecretShares = append(results.SecretShares, masterKey)
} else {
// Split the master key using the Shamir algorithm
shares, err := shamir.Split(masterKey, config.SecretShares, config.SecretThreshold)
if err != nil {
c.logger.Printf("[ERR] core: failed to generate shares: %v", err)
return nil, fmt.Errorf("failed to generate shares: %v", err)
}
results.SecretShares = shares
}
if len(config.PGPKeys) > 0 {
encryptedShares, err := pgpkeys.EncryptShares(results.SecretShares, config.PGPKeys)
if err != nil {
return nil, err
}
results.SecretShares = encryptedShares
}
// Initialize the barrier
if err := c.barrier.Initialize(masterKey); err != nil {
c.logger.Printf("[ERR] core: failed to initialize barrier: %v", err)
return nil, fmt.Errorf("failed to initialize barrier: %v", err)
}
c.logger.Printf("[INFO] core: security barrier initialized (shares: %d, threshold %d)",
config.SecretShares, config.SecretThreshold)
// Unseal the barrier
if err := c.barrier.Unseal(masterKey); err != nil {
c.logger.Printf("[ERR] core: failed to unseal barrier: %v", err)
return nil, fmt.Errorf("failed to unseal barrier: %v", err)
}
// Ensure the barrier is re-sealed
defer func() {
if err := c.barrier.Seal(); err != nil {
c.logger.Printf("[ERR] core: failed to seal barrier: %v", err)
}
}()
// Perform initial setup
if err := c.postUnseal(); err != nil {
c.logger.Printf("[ERR] core: post-unseal setup failed: %v", err)
return nil, err
}
// Generate a new root token
rootToken, err := c.tokenStore.RootToken()
if err != nil {
c.logger.Printf("[ERR] core: root token generation failed: %v", err)
return nil, err
}
results.RootToken = rootToken.ID
c.logger.Printf("[INFO] core: root token generated")
// Prepare to re-seal
if err := c.preSeal(); err != nil {
c.logger.Printf("[ERR] core: pre-seal teardown failed: %v", err)
return nil, err
}
return results, nil
}
// RekeyUpdate is used to provide a new key part
func (c *Core) RekeyUpdate(key []byte) (*RekeyResult, error) {
// Verify the key length
min, max := c.barrier.KeyLength()
max += shamir.ShareOverhead
if len(key) < min {
return nil, &ErrInvalidKey{fmt.Sprintf("key is shorter than minimum %d bytes", min)}
}
if len(key) > max {
return nil, &ErrInvalidKey{fmt.Sprintf("key is longer than maximum %d bytes", max)}
}
// Get the seal configuration
config, err := c.SealConfig()
if err != nil {
return nil, err
}
// Ensure the barrier is initialized
if config == nil {
return nil, ErrNotInit
}
// Ensure we are already unsealed
c.stateLock.RLock()
defer c.stateLock.RUnlock()
if c.sealed {
return nil, ErrSealed
}
if c.standby {
return nil, ErrStandby
}
c.rekeyLock.Lock()
defer c.rekeyLock.Unlock()
// Ensure a rekey is in progress
if c.rekeyConfig == nil {
return nil, fmt.Errorf("no rekey in progress")
}
// Check if we already have this piece
for _, existing := range c.rekeyProgress {
if bytes.Equal(existing, key) {
return nil, nil
}
}
// Store this key
c.rekeyProgress = append(c.rekeyProgress, key)
// Check if we don't have enough keys to unlock
if len(c.rekeyProgress) < config.SecretThreshold {
c.logger.Printf("[DEBUG] core: cannot rekey, have %d of %d keys",
len(c.rekeyProgress), config.SecretThreshold)
return nil, nil
}
// Recover the master key
var masterKey []byte
if config.SecretThreshold == 1 {
masterKey = c.rekeyProgress[0]
c.rekeyProgress = nil
} else {
masterKey, err = shamir.Combine(c.rekeyProgress)
c.rekeyProgress = nil
if err != nil {
return nil, fmt.Errorf("failed to compute master key: %v", err)
}
}
// Verify the master key
if err := c.barrier.VerifyMaster(masterKey); err != nil {
c.logger.Printf("[ERR] core: rekey aborted, master key verification failed: %v", err)
return nil, err
}
// Generate a new master key
newMasterKey, err := c.barrier.GenerateKey()
if err != nil {
c.logger.Printf("[ERR] core: failed to generate master key: %v", err)
return nil, fmt.Errorf("master key generation failed: %v", err)
}
// Return the master key if only a single key part is used
results := new(RekeyResult)
if c.rekeyConfig.SecretShares == 1 {
results.SecretShares = append(results.SecretShares, newMasterKey)
} else {
// Split the master key using the Shamir algorithm
shares, err := shamir.Split(newMasterKey, c.rekeyConfig.SecretShares, c.rekeyConfig.SecretThreshold)
if err != nil {
c.logger.Printf("[ERR] core: failed to generate shares: %v", err)
return nil, fmt.Errorf("failed to generate shares: %v", err)
}
results.SecretShares = shares
}
if len(c.rekeyConfig.PGPKeys) > 0 {
encryptedShares, err := pgpkeys.EncryptShares(results.SecretShares, c.rekeyConfig.PGPKeys)
if err != nil {
return nil, err
}
results.SecretShares = encryptedShares
}
// Encode the seal configuration
buf, err := json.Marshal(c.rekeyConfig)
if err != nil {
return nil, fmt.Errorf("failed to encode seal configuration: %v", err)
}
// Rekey the barrier
if err := c.barrier.Rekey(newMasterKey); err != nil {
c.logger.Printf("[ERR] core: failed to rekey barrier: %v", err)
return nil, fmt.Errorf("failed to rekey barrier: %v", err)
}
c.logger.Printf("[INFO] core: security barrier rekeyed (shares: %d, threshold: %d)",
c.rekeyConfig.SecretShares, c.rekeyConfig.SecretThreshold)
// Store the seal configuration
pe := &physical.Entry{
Key: coreSealConfigPath,
Value: buf,
}
if err := c.physical.Put(pe); err != nil {
c.logger.Printf("[ERR] core: failed to update seal configuration: %v", err)
return nil, fmt.Errorf("failed to update seal configuration: %v", err)
}
// Done!
c.rekeyProgress = nil
c.rekeyConfig = nil
return results, nil
}
// RecoveryRekeyUpdate is used to provide a new key part
func (c *Core) RecoveryRekeyUpdate(key []byte, nonce string) (*RekeyResult, error) {
// Ensure we are already unsealed
c.stateLock.RLock()
defer c.stateLock.RUnlock()
if c.sealed {
return nil, ErrSealed
}
if c.standby {
return nil, ErrStandby
}
// Verify the key length
min, max := c.barrier.KeyLength()
max += shamir.ShareOverhead
if len(key) < min {
return nil, &ErrInvalidKey{fmt.Sprintf("key is shorter than minimum %d bytes", min)}
}
if len(key) > max {
return nil, &ErrInvalidKey{fmt.Sprintf("key is longer than maximum %d bytes", max)}
}
c.rekeyLock.Lock()
defer c.rekeyLock.Unlock()
// Get the seal configuration
barrierConfig, err := c.seal.BarrierConfig()
if err != nil {
return nil, err
}
// Ensure the barrier is initialized
if barrierConfig == nil {
return nil, ErrNotInit
}
existingConfig, err := c.seal.RecoveryConfig()
if err != nil {
return nil, err
}
// Ensure a rekey is in progress
if c.recoveryRekeyConfig == nil {
return nil, fmt.Errorf("no rekey in progress")
}
if nonce != c.recoveryRekeyConfig.Nonce {
return nil, fmt.Errorf("incorrect nonce supplied; nonce for this rekey operation is %s", c.recoveryRekeyConfig.Nonce)
}
// Check if we already have this piece
for _, existing := range c.recoveryRekeyProgress {
if bytes.Equal(existing, key) {
return nil, nil
}
}
// Store this key
c.recoveryRekeyProgress = append(c.recoveryRekeyProgress, key)
// Check if we don't have enough keys to unlock
if len(c.recoveryRekeyProgress) < existingConfig.SecretThreshold {
c.logger.Printf("[DEBUG] core: cannot rekey, have %d of %d keys",
len(c.recoveryRekeyProgress), existingConfig.SecretThreshold)
return nil, nil
}
// Recover the master key
var masterKey []byte
if existingConfig.SecretThreshold == 1 {
masterKey = c.recoveryRekeyProgress[0]
c.recoveryRekeyProgress = nil
} else {
masterKey, err = shamir.Combine(c.recoveryRekeyProgress)
c.recoveryRekeyProgress = nil
if err != nil {
return nil, fmt.Errorf("failed to compute recovery key: %v", err)
}
}
// Verify the recovery key
if err := c.seal.VerifyRecoveryKey(masterKey); err != nil {
c.logger.Printf("[ERR] core: rekey aborted, recovery key verification failed: %v", err)
return nil, err
}
// Generate a new master key
newMasterKey, err := c.barrier.GenerateKey()
if err != nil {
c.logger.Printf("[ERR] core: failed to generate recovery key: %v", err)
return nil, fmt.Errorf("recovery key generation failed: %v", err)
}
// Return the master 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, newMasterKey)
} else {
// Split the master key using the Shamir algorithm
shares, err := shamir.Split(newMasterKey, c.recoveryRekeyConfig.SecretShares, c.recoveryRekeyConfig.SecretThreshold)
if err != nil {
c.logger.Printf("[ERR] core: failed to generate shares: %v", err)
return nil, fmt.Errorf("failed to generate shares: %v", err)
}
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, err
}
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.Printf("[ERR] core: failed to marshal recovery key backup: %v", err)
return nil, fmt.Errorf("failed to marshal recovery key backup: %v", err)
}
pe := &physical.Entry{
Key: coreRecoveryUnsealKeysBackupPath,
Value: buf,
}
if err = c.physical.Put(pe); err != nil {
c.logger.Printf("[ERR] core: failed to save unseal key backup: %v", err)
return nil, fmt.Errorf("failed to save unseal key backup: %v", err)
}
}
}
if err := c.seal.SetRecoveryKey(newMasterKey); err != nil {
c.logger.Printf("[ERR] core: failed to set recovery key: %v", err)
return nil, fmt.Errorf("failed to set recovery key: %v", err)
}
if err := c.seal.SetRecoveryConfig(c.recoveryRekeyConfig); err != nil {
c.logger.Printf("[ERR] core: error saving rekey seal configuration: %v", err)
return nil, fmt.Errorf("failed to save rekey seal configuration: %v", err)
}
// Done!
c.recoveryRekeyProgress = nil
c.recoveryRekeyConfig = nil
return results, nil
}
