263 lines
7.0 KiB
Go
263 lines
7.0 KiB
Go
// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package ssh_test
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import (
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"bytes"
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"fmt"
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"io/ioutil"
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"log"
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"net"
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"net/http"
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"golang.org/x/crypto/ssh"
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"golang.org/x/crypto/ssh/terminal"
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)
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func ExampleNewServerConn() {
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// Public key authentication is done by comparing
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// the public key of a received connection
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// with the entries in the authorized_keys file.
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authorizedKeysBytes, err := ioutil.ReadFile("authorized_keys")
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if err != nil {
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log.Fatalf("Failed to load authorized_keys, err: %v", err)
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}
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authorizedKeysMap := map[string]bool{}
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for len(authorizedKeysBytes) > 0 {
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pubKey, _, _, rest, err := ssh.ParseAuthorizedKey(authorizedKeysBytes)
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if err != nil {
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log.Fatal(err)
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}
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authorizedKeysMap[string(pubKey.Marshal())] = true
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authorizedKeysBytes = rest
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}
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// An SSH server is represented by a ServerConfig, which holds
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// certificate details and handles authentication of ServerConns.
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config := &ssh.ServerConfig{
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// Remove to disable password auth.
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PasswordCallback: func(c ssh.ConnMetadata, pass []byte) (*ssh.Permissions, error) {
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// Should use constant-time compare (or better, salt+hash) in
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// a production setting.
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if c.User() == "testuser" && string(pass) == "tiger" {
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return nil, nil
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}
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return nil, fmt.Errorf("password rejected for %q", c.User())
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},
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// Remove to disable public key auth.
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PublicKeyCallback: func(c ssh.ConnMetadata, pubKey ssh.PublicKey) (*ssh.Permissions, error) {
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if authorizedKeysMap[string(pubKey.Marshal())] {
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return nil, nil
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}
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return nil, fmt.Errorf("unknown public key for %q", c.User())
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},
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}
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privateBytes, err := ioutil.ReadFile("id_rsa")
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if err != nil {
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log.Fatal("Failed to load private key: ", err)
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}
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private, err := ssh.ParsePrivateKey(privateBytes)
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if err != nil {
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log.Fatal("Failed to parse private key: ", err)
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}
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config.AddHostKey(private)
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// Once a ServerConfig has been configured, connections can be
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// accepted.
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listener, err := net.Listen("tcp", "0.0.0.0:2022")
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if err != nil {
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log.Fatal("failed to listen for connection: ", err)
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}
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nConn, err := listener.Accept()
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if err != nil {
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log.Fatal("failed to accept incoming connection: ", err)
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}
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// Before use, a handshake must be performed on the incoming
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// net.Conn.
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_, chans, reqs, err := ssh.NewServerConn(nConn, config)
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if err != nil {
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log.Fatal("failed to handshake: ", err)
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}
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// The incoming Request channel must be serviced.
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go ssh.DiscardRequests(reqs)
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// Service the incoming Channel channel.
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// Service the incoming Channel channel.
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for newChannel := range chans {
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// Channels have a type, depending on the application level
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// protocol intended. In the case of a shell, the type is
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// "session" and ServerShell may be used to present a simple
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// terminal interface.
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if newChannel.ChannelType() != "session" {
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newChannel.Reject(ssh.UnknownChannelType, "unknown channel type")
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continue
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}
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channel, requests, err := newChannel.Accept()
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if err != nil {
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log.Fatalf("Could not accept channel: %v", err)
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}
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// Sessions have out-of-band requests such as "shell",
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// "pty-req" and "env". Here we handle only the
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// "shell" request.
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go func(in <-chan *ssh.Request) {
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for req := range in {
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req.Reply(req.Type == "shell", nil)
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}
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}(requests)
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term := terminal.NewTerminal(channel, "> ")
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go func() {
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defer channel.Close()
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for {
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line, err := term.ReadLine()
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if err != nil {
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break
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}
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fmt.Println(line)
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}
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}()
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}
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}
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func ExampleDial() {
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// An SSH client is represented with a ClientConn.
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//
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// To authenticate with the remote server you must pass at least one
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// implementation of AuthMethod via the Auth field in ClientConfig.
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config := &ssh.ClientConfig{
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User: "username",
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Auth: []ssh.AuthMethod{
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ssh.Password("yourpassword"),
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},
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}
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client, err := ssh.Dial("tcp", "yourserver.com:22", config)
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if err != nil {
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log.Fatal("Failed to dial: ", err)
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}
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// Each ClientConn can support multiple interactive sessions,
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// represented by a Session.
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session, err := client.NewSession()
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if err != nil {
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log.Fatal("Failed to create session: ", err)
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}
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defer session.Close()
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// Once a Session is created, you can execute a single command on
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// the remote side using the Run method.
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var b bytes.Buffer
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session.Stdout = &b
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if err := session.Run("/usr/bin/whoami"); err != nil {
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log.Fatal("Failed to run: " + err.Error())
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}
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fmt.Println(b.String())
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}
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func ExamplePublicKeys() {
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// A public key may be used to authenticate against the remote
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// server by using an unencrypted PEM-encoded private key file.
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//
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// If you have an encrypted private key, the crypto/x509 package
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// can be used to decrypt it.
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key, err := ioutil.ReadFile("/home/user/.ssh/id_rsa")
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if err != nil {
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log.Fatalf("unable to read private key: %v", err)
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}
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// Create the Signer for this private key.
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signer, err := ssh.ParsePrivateKey(key)
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if err != nil {
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log.Fatalf("unable to parse private key: %v", err)
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}
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config := &ssh.ClientConfig{
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User: "user",
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Auth: []ssh.AuthMethod{
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// Use the PublicKeys method for remote authentication.
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ssh.PublicKeys(signer),
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},
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}
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// Connect to the remote server and perform the SSH handshake.
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client, err := ssh.Dial("tcp", "host.com:22", config)
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if err != nil {
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log.Fatalf("unable to connect: %v", err)
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}
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defer client.Close()
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}
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func ExampleClient_Listen() {
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config := &ssh.ClientConfig{
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User: "username",
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Auth: []ssh.AuthMethod{
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ssh.Password("password"),
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},
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}
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// Dial your ssh server.
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conn, err := ssh.Dial("tcp", "localhost:22", config)
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if err != nil {
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log.Fatal("unable to connect: ", err)
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}
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defer conn.Close()
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// Request the remote side to open port 8080 on all interfaces.
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l, err := conn.Listen("tcp", "0.0.0.0:8080")
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if err != nil {
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log.Fatal("unable to register tcp forward: ", err)
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}
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defer l.Close()
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// Serve HTTP with your SSH server acting as a reverse proxy.
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http.Serve(l, http.HandlerFunc(func(resp http.ResponseWriter, req *http.Request) {
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fmt.Fprintf(resp, "Hello world!\n")
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}))
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}
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func ExampleSession_RequestPty() {
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// Create client config
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config := &ssh.ClientConfig{
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User: "username",
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Auth: []ssh.AuthMethod{
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ssh.Password("password"),
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},
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}
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// Connect to ssh server
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conn, err := ssh.Dial("tcp", "localhost:22", config)
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if err != nil {
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log.Fatal("unable to connect: ", err)
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}
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defer conn.Close()
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// Create a session
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session, err := conn.NewSession()
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if err != nil {
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log.Fatal("unable to create session: ", err)
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}
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defer session.Close()
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// Set up terminal modes
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modes := ssh.TerminalModes{
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ssh.ECHO: 0, // disable echoing
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ssh.TTY_OP_ISPEED: 14400, // input speed = 14.4kbaud
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ssh.TTY_OP_OSPEED: 14400, // output speed = 14.4kbaud
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}
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// Request pseudo terminal
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if err := session.RequestPty("xterm", 40, 80, modes); err != nil {
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log.Fatal("request for pseudo terminal failed: ", err)
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}
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// Start remote shell
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if err := session.Shell(); err != nil {
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log.Fatal("failed to start shell: ", err)
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}
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}
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