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hostkey.go
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hostkey.go
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//
// Copyright The Athenz Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
package hostkey
import (
"bytes"
"encoding/json"
"fmt"
"os"
"path/filepath"
"time"
)
type KeyType int
const (
_ KeyType = iota
Rsa
Ecdsa
Ed25519
)
const DEFAULT_KEYTYPE = "rsa"
var toString = map[KeyType]string{
Rsa: "rsa",
Ecdsa: "ecdsa",
Ed25519: "ed25519",
}
var toId = map[string]KeyType{
"rsa": Rsa,
"ecdsa": Ecdsa,
"ed25519": Ed25519,
}
// MarshalJSON marshals the enum as a quoted json string
func (s KeyType) MarshalJSON() ([]byte, error) {
buffer := bytes.NewBufferString(`"`)
buffer.WriteString(toString[s])
buffer.WriteString(`"`)
return buffer.Bytes(), nil
}
// UnmarshalJSON unmashals a quoted json string to the enum value
func (s *KeyType) UnmarshalJSON(b []byte) error {
var j string
err := json.Unmarshal(b, &j)
if err != nil {
return err
}
if val, ok := toId[j]; ok {
*s = val
} else {
*s = toId[DEFAULT_KEYTYPE]
}
return nil
}
// PubKey reads the content of file, until a non-nil error and upto n times
// each retry sleeps for a second
func PubKey(file string, n int) ([]byte, error) {
var pubKey []byte
var err error
for i := 0; i < n; i++ {
pubKey, err = os.ReadFile(file)
if err == nil {
return pubKey, nil
}
time.Sleep(time.Second)
}
return nil, err
}
// PubKeyFile returns the path to the public key of the host key type passed in
func PubKeyFile(sshDir string, keyType KeyType) string {
return filepath.Join(sshDir, fmt.Sprintf("ssh_host_%s_key.pub", toString[keyType]))
}
// CertFile returns the path to the ssh host certificate based on the keyType
func CertFile(sshDir string, keyType KeyType) string {
return filepath.Join(sshDir, fmt.Sprintf("ssh_host_%s_key-cert.pub", toString[keyType]))
}