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nodeid.go
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nodeid.go
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// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
package keys
import (
"fmt"
"github.com/talos-systems/talos/internal/pkg/smbios"
)
// NodeIDKeyHandler generates the key based on current node information
// and provided template string.
type NodeIDKeyHandler struct{}
// NewNodeIDKeyHandler creates new NodeIDKeyHandler.
func NewNodeIDKeyHandler() (*NodeIDKeyHandler, error) {
return &NodeIDKeyHandler{}, nil
}
// GetKey implements KeyHandler interface.
func (h *NodeIDKeyHandler) GetKey(options ...KeyOption) ([]byte, error) {
opts, err := NewDefaultOptions(options)
if err != nil {
return nil, err
}
s, err := smbios.GetSMBIOSInfo()
if err != nil {
return nil, err
}
machineUUID := s.SystemInformation.UUID
if machineUUID == "" {
return nil, fmt.Errorf("machine UUID is not populated %s", machineUUID)
}
// primitive entropy check
counts := map[rune]int{}
for _, s := range machineUUID {
counts[s]++
if counts[s] > len(machineUUID)/2 {
return nil, fmt.Errorf("machine UUID %s entropy check failed", machineUUID)
}
}
return []byte(machineUUID + opts.PartitionLabel), nil
}