dex/vendor/golang.org/x/crypto/ssh/example_test.go

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2016-07-26 01:30:28 +05:30
// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package ssh_test
import (
"bytes"
"fmt"
"io/ioutil"
"log"
"net"
"net/http"
"golang.org/x/crypto/ssh"
"golang.org/x/crypto/ssh/terminal"
)
func ExampleNewServerConn() {
// An SSH server is represented by a ServerConfig, which holds
// certificate details and handles authentication of ServerConns.
config := &ssh.ServerConfig{
PasswordCallback: func(c ssh.ConnMetadata, pass []byte) (*ssh.Permissions, error) {
// Should use constant-time compare (or better, salt+hash) in
// a production setting.
if c.User() == "testuser" && string(pass) == "tiger" {
return nil, nil
}
return nil, fmt.Errorf("password rejected for %q", c.User())
},
}
privateBytes, err := ioutil.ReadFile("id_rsa")
if err != nil {
panic("Failed to load private key")
}
private, err := ssh.ParsePrivateKey(privateBytes)
if err != nil {
panic("Failed to parse private key")
}
config.AddHostKey(private)
// Once a ServerConfig has been configured, connections can be
// accepted.
listener, err := net.Listen("tcp", "0.0.0.0:2022")
if err != nil {
panic("failed to listen for connection")
}
nConn, err := listener.Accept()
if err != nil {
panic("failed to accept incoming connection")
}
// Before use, a handshake must be performed on the incoming
// net.Conn.
_, chans, reqs, err := ssh.NewServerConn(nConn, config)
if err != nil {
panic("failed to handshake")
}
// The incoming Request channel must be serviced.
go ssh.DiscardRequests(reqs)
// Service the incoming Channel channel.
for newChannel := range chans {
// Channels have a type, depending on the application level
// protocol intended. In the case of a shell, the type is
// "session" and ServerShell may be used to present a simple
// terminal interface.
if newChannel.ChannelType() != "session" {
newChannel.Reject(ssh.UnknownChannelType, "unknown channel type")
continue
}
channel, requests, err := newChannel.Accept()
if err != nil {
panic("could not accept channel.")
}
// Sessions have out-of-band requests such as "shell",
// "pty-req" and "env". Here we handle only the
// "shell" request.
go func(in <-chan *ssh.Request) {
for req := range in {
ok := false
switch req.Type {
case "shell":
ok = true
if len(req.Payload) > 0 {
// We don't accept any
// commands, only the
// default shell.
ok = false
}
}
req.Reply(ok, nil)
}
}(requests)
term := terminal.NewTerminal(channel, "> ")
go func() {
defer channel.Close()
for {
line, err := term.ReadLine()
if err != nil {
break
}
fmt.Println(line)
}
}()
}
}
func ExampleDial() {
// An SSH client is represented with a ClientConn.
//
// To authenticate with the remote server you must pass at least one
// implementation of AuthMethod via the Auth field in ClientConfig.
config := &ssh.ClientConfig{
User: "username",
Auth: []ssh.AuthMethod{
ssh.Password("yourpassword"),
},
}
client, err := ssh.Dial("tcp", "yourserver.com:22", config)
if err != nil {
panic("Failed to dial: " + err.Error())
}
// Each ClientConn can support multiple interactive sessions,
// represented by a Session.
session, err := client.NewSession()
if err != nil {
panic("Failed to create session: " + err.Error())
}
defer session.Close()
// Once a Session is created, you can execute a single command on
// the remote side using the Run method.
var b bytes.Buffer
session.Stdout = &b
if err := session.Run("/usr/bin/whoami"); err != nil {
panic("Failed to run: " + err.Error())
}
fmt.Println(b.String())
}
func ExamplePublicKeys() {
// A public key may be used to authenticate against the remote
// server by using an unencrypted PEM-encoded private key file.
//
// If you have an encrypted private key, the crypto/x509 package
// can be used to decrypt it.
key, err := ioutil.ReadFile("/home/user/.ssh/id_rsa")
if err != nil {
log.Fatalf("unable to read private key: %v", err)
}
// Create the Signer for this private key.
signer, err := ssh.ParsePrivateKey(key)
if err != nil {
log.Fatalf("unable to parse private key: %v", err)
}
config := &ssh.ClientConfig{
User: "user",
Auth: []ssh.AuthMethod{
// Use the PublicKeys method for remote authentication.
ssh.PublicKeys(signer),
},
}
// Connect to the remote server and perform the SSH handshake.
client, err := ssh.Dial("tcp", "host.com:22", config)
if err != nil {
log.Fatalf("unable to connect: %v", err)
}
defer client.Close()
}
func ExampleClient_Listen() {
config := &ssh.ClientConfig{
User: "username",
Auth: []ssh.AuthMethod{
ssh.Password("password"),
},
}
// Dial your ssh server.
conn, err := ssh.Dial("tcp", "localhost:22", config)
if err != nil {
log.Fatalf("unable to connect: %s", err)
}
defer conn.Close()
// Request the remote side to open port 8080 on all interfaces.
l, err := conn.Listen("tcp", "0.0.0.0:8080")
if err != nil {
log.Fatalf("unable to register tcp forward: %v", err)
}
defer l.Close()
// Serve HTTP with your SSH server acting as a reverse proxy.
http.Serve(l, http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
fmt.Fprintf(resp, "Hello world!\n")
}))
}
func ExampleSession_RequestPty() {
// Create client config
config := &ssh.ClientConfig{
User: "username",
Auth: []ssh.AuthMethod{
ssh.Password("password"),
},
}
// Connect to ssh server
conn, err := ssh.Dial("tcp", "localhost:22", config)
if err != nil {
log.Fatalf("unable to connect: %s", err)
}
defer conn.Close()
// Create a session
session, err := conn.NewSession()
if err != nil {
log.Fatalf("unable to create session: %s", err)
}
defer session.Close()
// 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 {
log.Fatalf("request for pseudo terminal failed: %s", err)
}
// Start remote shell
if err := session.Shell(); err != nil {
log.Fatalf("failed to start shell: %s", err)
}
}