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keystore.go
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keystore.go
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/*
Copyright 2015 Gravitational, Inc.
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.
Keystore implements functions for saving and loading from hard disc
temporary teleport certificates
*/
package client
import (
"encoding/json"
"io/ioutil"
"os"
"path/filepath"
"strings"
"time"
log "github.com/Sirupsen/logrus"
"github.com/gravitational/trace"
"golang.org/x/crypto/ssh"
"golang.org/x/crypto/ssh/agent"
)
// GetLoadAgent loads all the saved teleport certificates and
// creates ssh agent with them
func GetLocalAgent() (agent.Agent, error) {
err := initKeysDir()
if err != nil {
return nil, trace.Wrap(err)
}
ag := agent.NewKeyring()
existingKeys, err := loadAllKeys()
if err != nil {
return nil, trace.Wrap(err)
}
for _, key := range existingKeys {
pcert, _, _, _, err := ssh.ParseAuthorizedKey(key.Cert)
if err != nil {
return nil, trace.Wrap(err)
}
pk, err := ssh.ParseRawPrivateKey(key.Priv)
if err != nil {
return nil, trace.Wrap(err)
}
addedKey := agent.AddedKey{
PrivateKey: pk,
Certificate: pcert.(*ssh.Certificate),
Comment: "",
LifetimeSecs: 0,
ConfirmBeforeUse: false,
}
if err := ag.Add(addedKey); err != nil {
return nil, trace.Wrap(err)
}
}
return ag, nil
}
func initKeysDir() error {
_, err := os.Stat(KeysDir)
if os.IsNotExist(err) {
err = os.MkdirAll(KeysDir, os.ModeDir|0777)
if err != nil {
return trace.Wrap(err)
}
} else {
if err != nil {
return trace.Wrap(err)
}
}
return nil
}
type Key struct {
Priv []byte
Cert []byte
Deadline time.Time
}
func saveKey(key Key, filename string) error {
err := initKeysDir()
bytes, err := json.Marshal(key)
if err != nil {
return trace.Wrap(err)
}
err = ioutil.WriteFile(filename, bytes, 0666)
if err != nil {
return trace.Wrap(err)
}
return nil
}
func loadKey(filename string) (Key, error) {
bytes, err := ioutil.ReadFile(filename)
if err != nil {
return Key{}, trace.Wrap(err)
}
var key Key
err = json.Unmarshal(bytes, &key)
if err != nil {
return Key{}, trace.Wrap(err)
}
return key, nil
}
func loadAllKeys() ([]Key, error) {
keys := make([]Key, 0)
files, err := ioutil.ReadDir(KeysDir)
if err != nil {
return nil, trace.Wrap(err)
}
for _, file := range files {
if !file.IsDir() && strings.HasPrefix(file.Name(), KeyFilePrefix) &&
strings.HasSuffix(file.Name(), KeyFileSuffix) {
key, err := loadKey(filepath.Join(KeysDir, file.Name()))
if err != nil {
log.Errorf(err.Error())
continue
}
if time.Now().Before(key.Deadline) {
keys = append(keys, key)
} else {
// remove old keys
err = os.Remove(filepath.Join(KeysDir, file.Name()))
if err != nil {
log.Errorf(err.Error())
}
}
}
}
return keys, nil
}
const (
KeysDir = "/tmp/teleport"
KeyFilePrefix = "teleport_"
KeyFileSuffix = ".tkey"
)