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|
// +build windows
package cmd
import (
"fmt"
"io/ioutil"
"log"
"net"
"os"
"strings"
"golang.org/x/crypto/ssh"
"golang.org/x/crypto/ssh/agent"
"golang.org/x/crypto/ssh/terminal"
)
func connectSSH(user, host, key string, port int) {
fd := int(os.Stdin.Fd())
prevState, err := terminal.MakeRaw(fd)
if err != nil {
return
}
defer terminal.Restore(fd, prevState)
// vultr ssh needs to be in a terminal
if terminal.IsTerminal(fd) {
var config *ssh.ClientConfig
// use keyfile if provided
if key != "" {
signer, err := ssh.ParsePrivateKey(readKeyFile(key))
if err != nil {
log.Println("Could not parse private key file")
log.Fatal(err)
}
config = &ssh.ClientConfig{
User: user,
Auth: []ssh.AuthMethod{
ssh.PublicKeys(signer),
},
}
} else if os.Getenv("SSH_AUTH_SOCK") != "" {
// if no keyfile is provided, try to use ssh-agent
conn, err := net.Dial("unix", os.Getenv("SSH_AUTH_SOCK"))
if err != nil {
log.Fatal(err)
}
defer conn.Close()
sshAgent := agent.NewClient(conn)
config = &ssh.ClientConfig{
User: user,
Auth: []ssh.AuthMethod{
ssh.PublicKeysCallback(sshAgent.Signers),
},
}
}
// connect to ssh
client, err := ssh.Dial("tcp", fmt.Sprintf("%v:%v", host, port), config)
if err != nil {
if strings.Contains(err.Error(), "no supported methods remain") {
// let's see if we can maybe give it one more try by using an interactive password prompt
fmt.Print("Password: ")
password, err := terminal.ReadPassword(fd)
if err != nil {
log.Fatal(err)
}
config = &ssh.ClientConfig{
User: user,
Auth: []ssh.AuthMethod{
ssh.Password(string(password)),
},
}
client, err = ssh.Dial("tcp", fmt.Sprintf("%v:%v", host, port), config)
if err != nil {
log.Fatal(err)
}
} else {
log.Fatal(err)
}
}
defer client.Close()
session, err := client.NewSession()
if err != nil {
log.Fatal(err)
}
defer session.Close()
session.Stdout = os.Stdout
session.Stderr = os.Stderr
session.Stdin = os.Stdin
termWidth, termHeight, err := terminal.GetSize(fd)
if err != nil {
return
}
modes := ssh.TerminalModes{
ssh.ECHO: 0,
ssh.TTY_OP_ISPEED: 14400,
ssh.TTY_OP_OSPEED: 14400,
}
if err := session.RequestPty("xterm", termWidth, termHeight, modes); err != nil {
log.Fatal(err)
}
if err := session.Shell(); err != nil {
log.Fatal(err)
}
if err := session.Wait(); err != nil {
log.Fatal(err)
}
} else {
log.Fatal("vultr ssh needs an interactive terminal to work")
}
}
func readKeyFile(filename string) []byte {
data, err := ioutil.ReadFile(filename)
if err != nil {
log.Println("Could not read ssh key file: " + filename)
log.Fatal(err)
}
return data
}
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