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client.go
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client.go
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package sshw
import (
"bufio"
"fmt"
"io"
"io/ioutil"
"net"
"os"
"os/user"
"path/filepath"
"strconv"
"strings"
"syscall"
"time"
"golang.org/x/crypto/ssh"
"golang.org/x/crypto/ssh/terminal"
)
var (
DefaultCiphers = []string{
"aes128-ctr",
"aes192-ctr",
"aes256-ctr",
"aes128-gcm@openssh.com",
"chacha20-poly1305@openssh.com",
"arcfour256",
"arcfour128",
"arcfour",
"aes128-cbc",
"3des-cbc",
"blowfish-cbc",
"cast128-cbc",
"aes192-cbc",
"aes256-cbc",
}
)
type Client interface {
Login()
}
type defaultClient struct {
clientConfig *ssh.ClientConfig
node *Node
}
func genSSHConfig(node *Node) *defaultClient {
u, err := user.Current()
if err != nil {
l.Error(err)
return nil
}
var authMethods []ssh.AuthMethod
var pemBytes []byte
if node.KeyPath == "" {
pemBytes, err = ioutil.ReadFile(filepath.Join(u.HomeDir, ".ssh/id_rsa"))
} else {
pemBytes, err = ioutil.ReadFile(node.KeyPath)
}
if err != nil {
l.Error(err)
} else {
var signer ssh.Signer
if node.Passphrase != "" {
signer, err = ssh.ParsePrivateKeyWithPassphrase(pemBytes, []byte(node.Passphrase))
} else {
signer, err = ssh.ParsePrivateKey(pemBytes)
}
if err != nil {
l.Error(err)
} else {
authMethods = append(authMethods, ssh.PublicKeys(signer))
}
}
password := node.password()
if password != nil {
authMethods = append(authMethods, password)
}
authMethods = append(authMethods, ssh.KeyboardInteractive(func(user, instruction string, questions []string, echos []bool) ([]string, error) {
answers := make([]string, 0, len(questions))
for i, q := range questions {
fmt.Print(q)
if echos[i] {
scan := bufio.NewScanner(os.Stdin)
if scan.Scan() {
answers = append(answers, scan.Text())
}
err := scan.Err()
if err != nil {
return nil, err
}
} else {
b, err := terminal.ReadPassword(int(syscall.Stdin))
if err != nil {
return nil, err
}
fmt.Println()
answers = append(answers, string(b))
}
}
return answers, nil
}))
config := &ssh.ClientConfig{
User: node.user(),
Auth: authMethods,
HostKeyCallback: ssh.InsecureIgnoreHostKey(),
Timeout: time.Second * 10,
}
config.SetDefaults()
config.Ciphers = append(config.Ciphers, DefaultCiphers...)
return &defaultClient{
clientConfig: config,
node: node,
}
}
func NewClient(node *Node) Client {
return genSSHConfig(node)
}
func (c *defaultClient) Login() {
host := c.node.Host
port := strconv.Itoa(c.node.port())
jNodes := c.node.Jump
var client *ssh.Client
if len(jNodes) > 0 {
jNode := jNodes[0]
jc := genSSHConfig(jNode)
proxyClient, err := ssh.Dial("tcp", net.JoinHostPort(jNode.Host, strconv.Itoa(jNode.port())), jc.clientConfig)
if err != nil {
l.Error(err)
return
}
conn, err := proxyClient.Dial("tcp", net.JoinHostPort(host, port))
if err != nil {
l.Error(err)
return
}
ncc, chans, reqs, err := ssh.NewClientConn(conn, net.JoinHostPort(host, port), c.clientConfig)
if err != nil {
l.Error(err)
return
}
client = ssh.NewClient(ncc, chans, reqs)
} else {
client1, err := ssh.Dial("tcp", net.JoinHostPort(host, port), c.clientConfig)
client = client1
if err != nil {
msg := err.Error()
// use terminal password retry
if strings.Contains(msg, "no supported methods remain") && !strings.Contains(msg, "password") {
fmt.Printf("%s@%s's password:", c.clientConfig.User, host)
var b []byte
b, err = terminal.ReadPassword(int(syscall.Stdin))
if err == nil {
p := string(b)
if p != "" {
c.clientConfig.Auth = append(c.clientConfig.Auth, ssh.Password(p))
}
fmt.Println()
client, err = ssh.Dial("tcp", net.JoinHostPort(host, port), c.clientConfig)
}
}
}
if err != nil {
l.Error(err)
return
}
}
defer client.Close()
l.Infof("connect server ssh -p %d %s@%s version: %s\n", c.node.port(), c.node.user(), host, string(client.ServerVersion()))
session, err := client.NewSession()
if err != nil {
l.Error(err)
return
}
defer session.Close()
fd := int(os.Stdin.Fd())
state, err := terminal.MakeRaw(fd)
if err != nil {
l.Error(err)
return
}
defer terminal.Restore(fd, state)
w, h, err := terminal.GetSize(fd)
if err != nil {
l.Error(err)
return
}
modes := ssh.TerminalModes{
ssh.ECHO: 1,
ssh.TTY_OP_ISPEED: 14400,
ssh.TTY_OP_OSPEED: 14400,
}
err = session.RequestPty("xterm", h, w, modes)
if err != nil {
l.Error(err)
return
}
session.Stdout = os.Stdout
session.Stderr = os.Stderr
stdinPipe, err := session.StdinPipe()
if err != nil {
l.Error(err)
return
}
err = session.Shell()
if err != nil {
l.Error(err)
return
}
// then callback
for i := range c.node.CallbackShells {
shell := c.node.CallbackShells[i]
time.Sleep(shell.Delay * time.Millisecond)
stdinPipe.Write([]byte(shell.Cmd + "\r"))
}
// change stdin to user
go func() {
_, err = io.Copy(stdinPipe, os.Stdin)
l.Error(err)
session.Close()
}()
// interval get terminal size
// fix resize issue
go func() {
var (
ow = w
oh = h
)
for {
cw, ch, err := terminal.GetSize(fd)
if err != nil {
break
}
if cw != ow || ch != oh {
err = session.WindowChange(ch, cw)
if err != nil {
break
}
ow = cw
oh = ch
}
time.Sleep(time.Second)
}
}()
// send keepalive
go func() {
for {
time.Sleep(time.Second * 10)
client.SendRequest("keepalive@openssh.com", false, nil)
}
}()
session.Wait()
}