mirror of
https://github.com/fatedier/frp.git
synced 2024-12-15 03:01:43 +01:00
216 lines
4.4 KiB
Go
216 lines
4.4 KiB
Go
// Copyright 2014 The Go Authors. All rights reserved.
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package agent
|
|
|
|
import (
|
|
"bytes"
|
|
"crypto/rand"
|
|
"crypto/subtle"
|
|
"errors"
|
|
"fmt"
|
|
"sync"
|
|
"time"
|
|
|
|
"golang.org/x/crypto/ssh"
|
|
)
|
|
|
|
type privKey struct {
|
|
signer ssh.Signer
|
|
comment string
|
|
expire *time.Time
|
|
}
|
|
|
|
type keyring struct {
|
|
mu sync.Mutex
|
|
keys []privKey
|
|
|
|
locked bool
|
|
passphrase []byte
|
|
}
|
|
|
|
var errLocked = errors.New("agent: locked")
|
|
|
|
// NewKeyring returns an Agent that holds keys in memory. It is safe
|
|
// for concurrent use by multiple goroutines.
|
|
func NewKeyring() Agent {
|
|
return &keyring{}
|
|
}
|
|
|
|
// RemoveAll removes all identities.
|
|
func (r *keyring) RemoveAll() error {
|
|
r.mu.Lock()
|
|
defer r.mu.Unlock()
|
|
if r.locked {
|
|
return errLocked
|
|
}
|
|
|
|
r.keys = nil
|
|
return nil
|
|
}
|
|
|
|
// removeLocked does the actual key removal. The caller must already be holding the
|
|
// keyring mutex.
|
|
func (r *keyring) removeLocked(want []byte) error {
|
|
found := false
|
|
for i := 0; i < len(r.keys); {
|
|
if bytes.Equal(r.keys[i].signer.PublicKey().Marshal(), want) {
|
|
found = true
|
|
r.keys[i] = r.keys[len(r.keys)-1]
|
|
r.keys = r.keys[:len(r.keys)-1]
|
|
continue
|
|
} else {
|
|
i++
|
|
}
|
|
}
|
|
|
|
if !found {
|
|
return errors.New("agent: key not found")
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Remove removes all identities with the given public key.
|
|
func (r *keyring) Remove(key ssh.PublicKey) error {
|
|
r.mu.Lock()
|
|
defer r.mu.Unlock()
|
|
if r.locked {
|
|
return errLocked
|
|
}
|
|
|
|
return r.removeLocked(key.Marshal())
|
|
}
|
|
|
|
// Lock locks the agent. Sign and Remove will fail, and List will return an empty list.
|
|
func (r *keyring) Lock(passphrase []byte) error {
|
|
r.mu.Lock()
|
|
defer r.mu.Unlock()
|
|
if r.locked {
|
|
return errLocked
|
|
}
|
|
|
|
r.locked = true
|
|
r.passphrase = passphrase
|
|
return nil
|
|
}
|
|
|
|
// Unlock undoes the effect of Lock
|
|
func (r *keyring) Unlock(passphrase []byte) error {
|
|
r.mu.Lock()
|
|
defer r.mu.Unlock()
|
|
if !r.locked {
|
|
return errors.New("agent: not locked")
|
|
}
|
|
if len(passphrase) != len(r.passphrase) || 1 != subtle.ConstantTimeCompare(passphrase, r.passphrase) {
|
|
return fmt.Errorf("agent: incorrect passphrase")
|
|
}
|
|
|
|
r.locked = false
|
|
r.passphrase = nil
|
|
return nil
|
|
}
|
|
|
|
// expireKeysLocked removes expired keys from the keyring. If a key was added
|
|
// with a lifetimesecs contraint and seconds >= lifetimesecs seconds have
|
|
// ellapsed, it is removed. The caller *must* be holding the keyring mutex.
|
|
func (r *keyring) expireKeysLocked() {
|
|
for _, k := range r.keys {
|
|
if k.expire != nil && time.Now().After(*k.expire) {
|
|
r.removeLocked(k.signer.PublicKey().Marshal())
|
|
}
|
|
}
|
|
}
|
|
|
|
// List returns the identities known to the agent.
|
|
func (r *keyring) List() ([]*Key, error) {
|
|
r.mu.Lock()
|
|
defer r.mu.Unlock()
|
|
if r.locked {
|
|
// section 2.7: locked agents return empty.
|
|
return nil, nil
|
|
}
|
|
|
|
r.expireKeysLocked()
|
|
var ids []*Key
|
|
for _, k := range r.keys {
|
|
pub := k.signer.PublicKey()
|
|
ids = append(ids, &Key{
|
|
Format: pub.Type(),
|
|
Blob: pub.Marshal(),
|
|
Comment: k.comment})
|
|
}
|
|
return ids, nil
|
|
}
|
|
|
|
// Insert adds a private key to the keyring. If a certificate
|
|
// is given, that certificate is added as public key. Note that
|
|
// any constraints given are ignored.
|
|
func (r *keyring) Add(key AddedKey) error {
|
|
r.mu.Lock()
|
|
defer r.mu.Unlock()
|
|
if r.locked {
|
|
return errLocked
|
|
}
|
|
signer, err := ssh.NewSignerFromKey(key.PrivateKey)
|
|
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if cert := key.Certificate; cert != nil {
|
|
signer, err = ssh.NewCertSigner(cert, signer)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
p := privKey{
|
|
signer: signer,
|
|
comment: key.Comment,
|
|
}
|
|
|
|
if key.LifetimeSecs > 0 {
|
|
t := time.Now().Add(time.Duration(key.LifetimeSecs) * time.Second)
|
|
p.expire = &t
|
|
}
|
|
|
|
r.keys = append(r.keys, p)
|
|
|
|
return nil
|
|
}
|
|
|
|
// Sign returns a signature for the data.
|
|
func (r *keyring) Sign(key ssh.PublicKey, data []byte) (*ssh.Signature, error) {
|
|
r.mu.Lock()
|
|
defer r.mu.Unlock()
|
|
if r.locked {
|
|
return nil, errLocked
|
|
}
|
|
|
|
r.expireKeysLocked()
|
|
wanted := key.Marshal()
|
|
for _, k := range r.keys {
|
|
if bytes.Equal(k.signer.PublicKey().Marshal(), wanted) {
|
|
return k.signer.Sign(rand.Reader, data)
|
|
}
|
|
}
|
|
return nil, errors.New("not found")
|
|
}
|
|
|
|
// Signers returns signers for all the known keys.
|
|
func (r *keyring) Signers() ([]ssh.Signer, error) {
|
|
r.mu.Lock()
|
|
defer r.mu.Unlock()
|
|
if r.locked {
|
|
return nil, errLocked
|
|
}
|
|
|
|
r.expireKeysLocked()
|
|
s := make([]ssh.Signer, 0, len(r.keys))
|
|
for _, k := range r.keys {
|
|
s = append(s, k.signer)
|
|
}
|
|
return s, nil
|
|
}
|