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package.go
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package.go
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package ssh
import (
"crypto"
"crypto/x509"
"encoding/pem"
"io"
"io/ioutil"
"time"
"golang.org/x/crypto/ssh"
"github.com/pkg/errors"
"github.com/pkg/sftp"
)
type Dialer interface {
Dial(address, username string, timeout time.Duration) (Connection, error)
}
type Connection interface {
UploadFile(path string, data []byte) (bool, error)
RunCommand(command string, output io.Writer) (uint8, error)
Close() error
}
func FormatPublicKey(key interface{}) ([]byte, error) {
pubKey, err := ssh.NewPublicKey(key)
if err != nil {
return nil, errors.Wrap(err, "couldn't use public key")
}
return ssh.MarshalAuthorizedKey(pubKey), nil
}
type AuthDialer struct {
authMethods []ssh.AuthMethod
}
func NewDialerWithKey(key crypto.Signer) (*AuthDialer, error) {
signer, err := ssh.NewSignerFromKey(key)
if err != nil {
return nil, errors.Wrap(err, "couldn't create signer from SSH key")
}
return &AuthDialer{
authMethods: []ssh.AuthMethod{ssh.PublicKeys(signer)},
}, nil
}
func NewDialerWithPassword(password string) (*AuthDialer, error) {
return &AuthDialer{
authMethods: []ssh.AuthMethod{ssh.Password(password)},
}, nil
}
func NewDialerWithKeyWithoutPassPhrase(pemBytes []byte) (*AuthDialer, error) {
signer, err := ssh.ParsePrivateKey(pemBytes)
if err != nil {
return nil, errors.Wrap(err, "couldn't create signer from SSH key")
}
return &AuthDialer{
authMethods: []ssh.AuthMethod{ssh.PublicKeys(signer)},
}, nil
}
func NewDialer(keyPath, keyPassphrase string) (*AuthDialer, error) {
file, err := ioutil.ReadFile(keyPath)
if err != nil {
return nil, errors.Wrap(err, "couldn't read SSH key")
}
block, _ := pem.Decode(file)
if block == nil {
return nil, errors.Errorf("ssh key does not contain a valid PEM block")
}
if keyPassphrase == "" {
return NewDialerWithKeyWithoutPassPhrase(file)
}
der, err := x509.DecryptPEMBlock(block, []byte(keyPassphrase))
if err != nil {
return nil, errors.Wrap(err, "couldn't decrypt SSH key")
}
key, err := x509.ParsePKCS1PrivateKey(der)
if err != nil {
return nil, errors.Wrap(err, "couldn't parse SSH key")
}
return NewDialerWithKey(key)
}
func (d *AuthDialer) Dial(address, username string, timeout time.Duration) (Connection, error) {
client, err := ssh.Dial("tcp", address, &ssh.ClientConfig{
User: username,
Auth: d.authMethods,
Timeout: timeout,
// TODO: Verify server public key against something (optionally)?
HostKeyCallback: ssh.InsecureIgnoreHostKey(),
})
if err != nil {
return nil, errors.Wrap(err, "couldn't connect to SSH server")
}
return &sshConnection{client: client}, nil
}
type sshConnection struct {
client *ssh.Client
}
func (c *sshConnection) UploadFile(path string, data []byte) (bool, error) {
sftp, err := sftp.NewClient(c.client)
if err != nil {
return false, errors.Wrap(err, "couldn't create SFTP client")
}
defer sftp.Close()
_, err = sftp.Lstat(path)
if err == nil {
return true, errors.New("file already existed")
}
f, err := sftp.Create(path)
if err != nil {
return false, errors.Wrap(err, "couldn't create file")
}
_, err = f.Write(data)
if err != nil {
return false, errors.Wrap(err, "couldn't write contents to file")
}
return false, nil
}
func (c *sshConnection) RunCommand(command string, output io.Writer) (uint8, error) {
session, err := c.client.NewSession()
if err != nil {
return 0, errors.Wrap(err, "error creating SSH session")
}
defer session.Close()
err = session.RequestPty("xterm", 40, 80, ssh.TerminalModes{})
if err != nil {
return 0, errors.Wrap(err, "error requesting PTY")
}
session.Stdout = output
session.Stderr = output
err = session.Run(command)
if err == nil {
return 0, nil
}
switch err := err.(type) {
case *ssh.ExitError:
return uint8(err.ExitStatus()), nil
default:
return 0, errors.Wrap(err, "error running script")
}
}
func (c *sshConnection) Close() error {
return c.client.Close()
}