/
proxy_keyring.go
200 lines (159 loc) · 3.3 KB
/
proxy_keyring.go
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package vaulted
import (
"errors"
"io/ioutil"
"log"
"net"
"os"
"path/filepath"
"golang.org/x/crypto/ssh"
"golang.org/x/crypto/ssh/agent"
)
type ProxyKeyring struct {
keyring agent.Agent
upstream agent.Agent
listener net.Listener
}
func NewProxyKeyring(upstreamAuthSock string) (*ProxyKeyring, error) {
var err error
var conn net.Conn
var upstream agent.Agent
if upstreamAuthSock != "" {
conn, err = net.Dial("unix", upstreamAuthSock)
if err != nil {
return nil, err
}
upstream = agent.NewClient(conn)
}
return &ProxyKeyring{
upstream: upstream,
keyring: agent.NewKeyring(),
}, nil
}
func (pk *ProxyKeyring) Listen() (string, error) {
if pk.listener != nil {
return "", errors.New("Already listening")
}
dir, err := ioutil.TempDir("", "proxykeyring")
if err != nil {
return "", err
}
err = os.Chmod(dir, 0700)
if err != nil {
return "", err
}
listener := filepath.Join(dir, "listener")
pk.listener, err = net.Listen("unix", listener)
if err != nil {
return "", err
}
err = os.Chmod(listener, 0600)
if err != nil {
return "", err
}
return listener, nil
}
func (pk *ProxyKeyring) Serve() error {
if pk.listener == nil {
return errors.New("Not listening")
}
for {
c, err := pk.listener.Accept()
if err != nil {
return err
}
go agent.ServeAgent(pk, c)
}
}
func (pk *ProxyKeyring) Close() error {
if pk.listener != nil {
return pk.listener.Close()
}
return nil
}
func (pk *ProxyKeyring) List() ([]*agent.Key, error) {
keys, err := pk.keyring.List()
if err != nil {
return nil, err
}
if pk.upstream != nil {
ukeys, err := pk.upstream.List()
if err != nil {
log.Printf("[ProxyKeyring] Upstream list error: %v", err)
} else {
keys = append(keys, ukeys...)
}
}
return keys, nil
}
func (pk *ProxyKeyring) Sign(key ssh.PublicKey, data []byte) (*ssh.Signature, error) {
sig, err := pk.keyring.Sign(key, data)
if err == nil {
return sig, nil
}
if pk.upstream != nil {
usig, uerr := pk.upstream.Sign(key, data)
if uerr == nil {
return usig, nil
}
}
return nil, err
}
func (pk *ProxyKeyring) Add(key agent.AddedKey) error {
return pk.keyring.Add(key)
}
func (pk *ProxyKeyring) Remove(key ssh.PublicKey) error {
err := pk.keyring.Remove(key)
if pk.upstream != nil {
uerr := pk.upstream.Remove(key)
if uerr == nil {
err = nil
}
}
return err
}
func (pk *ProxyKeyring) RemoveAll() error {
err := pk.keyring.RemoveAll()
if pk.upstream != nil {
uerr := pk.upstream.RemoveAll()
if err == nil {
err = uerr
}
}
return err
}
func (pk *ProxyKeyring) Lock(passphrase []byte) error {
err := pk.keyring.Lock(passphrase)
if pk.upstream != nil {
uerr := pk.upstream.Lock(passphrase)
if err == nil {
err = uerr
}
}
return err
}
func (pk *ProxyKeyring) Unlock(passphrase []byte) error {
err := pk.keyring.Unlock(passphrase)
if pk.upstream != nil {
uerr := pk.upstream.Unlock(passphrase)
if err == nil {
err = uerr
}
}
return err
}
func (pk *ProxyKeyring) Signers() ([]ssh.Signer, error) {
signers, err := pk.keyring.Signers()
if err != nil {
return nil, err
}
if pk.upstream != nil {
usigners, err := pk.upstream.Signers()
if err != nil {
log.Printf("[ProxyKeyring] Upstream signers error: %v", err)
} else {
signers = append(signers, usigners...)
}
}
return signers, nil
}