forked from wallix/awless
/
ssh.go
108 lines (89 loc) · 2.3 KB
/
ssh.go
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/*
Copyright 2017 WALLIX
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 console
import (
"fmt"
"io"
"io/ioutil"
"os"
"path/filepath"
"time"
"golang.org/x/crypto/ssh"
)
type Credentials struct {
IP string
User string
KeyName string
}
func NewSSHClient(keyDirectory string, cred *Credentials) (*ssh.Client, error) {
keyPath := filepath.Join(keyDirectory, cred.KeyName)
privateKey, err := ioutil.ReadFile(keyPath)
if os.IsNotExist(err) {
privateKey, err = ioutil.ReadFile(keyPath + ".pem")
if os.IsNotExist(err) {
return nil, fmt.Errorf("You don't have the '%s' key in your awless key folder '%s'.", cred.KeyName, keyDirectory)
}
}
if err != nil {
return nil, err
}
signer, err := ssh.ParsePrivateKey(privateKey)
if err != nil {
return nil, err
}
config := &ssh.ClientConfig{
User: cred.User,
Auth: []ssh.AuthMethod{
ssh.PublicKeys(signer),
},
Timeout: 2 * time.Second,
}
return ssh.Dial("tcp", cred.IP+":22", config)
}
func InteractiveTerminal(client *ssh.Client) error {
session, err := client.NewSession()
if err != nil {
return err
}
defer session.Close()
stdin, err := session.StdinPipe()
if err != nil {
return err
}
go io.Copy(stdin, os.Stdin)
stdout, err := session.StdoutPipe()
if err != nil {
return err
}
go io.Copy(os.Stdout, stdout)
stderr, err := session.StderrPipe()
if err != nil {
return err
}
go io.Copy(os.Stderr, stderr)
// Set up terminal modes
modes := ssh.TerminalModes{
ssh.ECHO: 0, // disable echoing
ssh.TTY_OP_ISPEED: 14400, // input speed = 14.4kbaud
ssh.TTY_OP_OSPEED: 14400, // output speed = 14.4kbaud
}
// Request pseudo terminal
if err := session.RequestPty("xterm", 80, 40, modes); err != nil {
return err
}
// Start remote shell
if err := session.Shell(); err != nil {
return err
}
return session.Wait()
}