Initial working version

vendor/github.com/cloudfoundry/socks5-proxy/.gitignore

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+.idea

vendor/github.com/cloudfoundry/socks5-proxy/LICENSE

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+                                 Apache License
+                           Version 2.0, January 2004
+                        http://www.apache.org/licenses/
+
+   TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
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+      the original version of the Work and any modifications or additions
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+      meet the following conditions:
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+      (a) You must give any other recipients of the Work or
+          Derivative Works a copy of this License; and
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+      (b) You must cause any modified files to carry prominent notices
+          stating that You changed the files; and
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+      (c) You must retain, in the Source form of any Derivative Works
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+      may provide additional or different license terms and conditions
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+      reproduction, and distribution of the Work otherwise complies with
+      the conditions stated in this License.
+
+   5. Submission of Contributions. Unless You explicitly state otherwise,
+      any Contribution intentionally submitted for inclusion in the Work
+      by You to the Licensor shall be under the terms and conditions of
+      this License, without any additional terms or conditions.
+      Notwithstanding the above, nothing herein shall supersede or modify
+      the terms of any separate license agreement you may have executed
+      with Licensor regarding such Contributions.
+
+   6. Trademarks. This License does not grant permission to use the trade
+      names, trademarks, service marks, or product names of the Licensor,
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+      origin of the Work and reproducing the content of the NOTICE file.
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+   7. Disclaimer of Warranty. Unless required by applicable law or
+      agreed to in writing, Licensor provides the Work (and each
+      Contributor provides its Contributions) on an "AS IS" BASIS,
+      WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
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+      PARTICULAR PURPOSE. You are solely responsible for determining the
+      appropriateness of using or redistributing the Work and assume any
+      risks associated with Your exercise of permissions under this License.
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+   8. Limitation of Liability. In no event and under no legal theory,
+      whether in tort (including negligence), contract, or otherwise,
+      unless required by applicable law (such as deliberate and grossly
+      negligent acts) or agreed to in writing, shall any Contributor be
+      liable to You for damages, including any direct, indirect, special,
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+      of your accepting any such warranty or additional liability.

vendor/github.com/cloudfoundry/socks5-proxy/NOTICE

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+Copyright (c) 2017-Present CloudFoundry.org Foundation, Inc. All Rights Reserved.
+
+This project is licensed to you under the Apache License, Version 2.0 (the "License").
+You may not use this project except in compliance with the License.
+
+This project may include a number of subcomponents with separate copyright notices
+and license terms. Your use of these subcomponents is subject to the terms and 
+conditions of the subcomponent's license, as noted in the LICENSE file.

vendor/github.com/cloudfoundry/socks5-proxy/README.md

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+# socks5-proxy
+This is a go library for starting a socks5 proxy server via SSH.
+
+It is intended to be used as a library by Golang CLIs that need to proxy via an SSH jumpbox, which is a common configuration for BOSH operators, so several CLIs in Cloud Foundry could benefit from its use.

vendor/github.com/cloudfoundry/socks5-proxy/host_key.go

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+package proxy
+
+import (
+	"net"
+
+	"golang.org/x/crypto/ssh"
+)
+
+type HostKey struct{}
+
+func NewHostKey() HostKey {
+	return HostKey{}
+}
+
+func (h HostKey) Get(username, privateKey, serverURL string) (ssh.PublicKey, error) {
+	publicKeyChannel := make(chan ssh.PublicKey, 1)
+	dialErrorChannel := make(chan error)
+
+	if username == "" {
+		username = "jumpbox"
+	}
+
+	signer, err := ssh.ParsePrivateKey([]byte(privateKey))
+	if err != nil {
+		return nil, err
+	}
+
+	clientConfig := NewSSHClientConfig(username, keyScanCallback(publicKeyChannel), ssh.PublicKeys(signer))
+
+	go func() {
+		conn, err := ssh.Dial("tcp", serverURL, clientConfig)
+		if err != nil {
+			publicKeyChannel <- nil
+			dialErrorChannel <- err
+			return
+		}
+		defer conn.Close()
+		dialErrorChannel <- nil
+	}()
+
+	return <-publicKeyChannel, <-dialErrorChannel
+}
+
+func keyScanCallback(publicKeyChannel chan ssh.PublicKey) ssh.HostKeyCallback {
+	return func(_ string, _ net.Addr, key ssh.PublicKey) error {
+		publicKeyChannel <- key
+		return nil
+	}
+}

vendor/github.com/cloudfoundry/socks5-proxy/socks5_proxy.go

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+package proxy
+
+import (
+	"errors"
+	"fmt"
+	"net"
+	"strconv"
+	"sync"
+	"time"
+
+	socks5 "github.com/cloudfoundry/go-socks5"
+
+	"log"
+
+	"golang.org/x/crypto/ssh"
+	"golang.org/x/net/context"
+)
+
+var netListen = net.Listen
+
+type hostKey interface {
+	Get(username, privateKey, serverURL string) (ssh.PublicKey, error)
+}
+
+type DialFunc func(network, address string) (net.Conn, error)
+
+type Socks5Proxy struct {
+	hostKey           hostKey
+	port              int
+	started           bool
+	keepAliveInterval time.Duration
+	logger            *log.Logger
+	mtx               sync.Mutex
+}
+
+func NewSocks5Proxy(hostKey hostKey, logger *log.Logger, keepAliveInterval time.Duration) *Socks5Proxy {
+	return &Socks5Proxy{
+		hostKey:           hostKey,
+		started:           false,
+		logger:            logger,
+		keepAliveInterval: keepAliveInterval,
+	}
+}
+
+func (s *Socks5Proxy) SetListenPort(port int) {
+	s.port = port
+}
+
+func (s *Socks5Proxy) Start(username, key, url string) error {
+	if s.isStarted() {
+		return nil
+	}
+
+	dialer, err := s.Dialer(username, key, url)
+	if err != nil {
+		return err
+	}
+
+	err = s.StartWithDialer(dialer)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}
+
+// thread safety
+func (s *Socks5Proxy) isStarted() bool {
+	s.mtx.Lock()
+	defer s.mtx.Unlock()
+	return s.started
+}
+
+func (s *Socks5Proxy) Dialer(username, key, url string) (DialFunc, error) {
+	if username == "" {
+		username = "jumpbox"
+	}
+
+	signer, err := ssh.ParsePrivateKey([]byte(key))
+	if err != nil {
+		return nil, fmt.Errorf("parse private key: %s", err)
+	}
+
+	hostKey, err := s.hostKey.Get(username, key, url)
+	if err != nil {
+		return nil, fmt.Errorf("get host key: %s", err)
+	}
+
+	clientConfig := NewSSHClientConfig(username, ssh.FixedHostKey(hostKey), ssh.PublicKeys(signer))
+
+	conn, err := ssh.Dial("tcp", url, clientConfig)
+	if err != nil {
+		return nil, fmt.Errorf("ssh dial: %s", err)
+	}
+
+	errChan := make(chan error)
+
+	go func(cl *ssh.Client, errChan chan error) {
+		t := time.NewTicker(s.keepAliveInterval)
+		for {
+			select {
+			case <-t.C:
+				_, _, err := cl.SendRequest("bosh-cli-keep-alive@bosh.io", true, nil)
+				if err != nil {
+					errChan <- err
+				}
+			}
+		}
+	}(conn, errChan)
+
+	go func(errChan chan error) {
+		for {
+			select {
+			case err := <-errChan:
+				s.logger.Printf("error sending ssh keep-alive: %s", err)
+			}
+		}
+	}(errChan)
+
+	return conn.Dial, nil
+}
+
+func (s *Socks5Proxy) StartWithDialer(dialer DialFunc) error {
+	conf := &socks5.Config{
+		Dial: func(ctx context.Context, network, addr string) (net.Conn, error) {
+			return dialer(network, addr)
+		},
+		Logger: s.logger,
+	}
+
+	server, err := socks5.New(conf)
+	if err != nil {
+		return fmt.Errorf("new socks5 server: %s", err) // not tested
+	}
+
+	s.mtx.Lock()
+	defer s.mtx.Unlock()
+	if s.port == 0 {
+		s.port, err = openPort()
+		if err != nil {
+			return fmt.Errorf("open port: %s", err)
+		}
+	}
+
+	go func() {
+		server.ListenAndServe("tcp", fmt.Sprintf("127.0.0.1:%d", s.port))
+	}()
+
+	s.started = true
+	return nil
+}
+
+func (s *Socks5Proxy) Addr() (string, error) {
+	s.mtx.Lock()
+	defer s.mtx.Unlock()
+	if s.port == 0 {
+		return "", errors.New("socks5 proxy is not running")
+	}
+	return fmt.Sprintf("127.0.0.1:%d", s.port), nil
+}
+
+func openPort() (int, error) {
+	l, err := netListen("tcp", "localhost:0")
+	if err != nil {
+		return 0, err
+	}
+
+	defer l.Close()
+	_, port, err := net.SplitHostPort(l.Addr().String())
+	if err != nil {
+		return 0, err
+	}
+
+	return strconv.Atoi(port)
+}

vendor/github.com/cloudfoundry/socks5-proxy/ssh_client_config.go

@@ -0,0 +1,15 @@
+package proxy
+
+import (
+	"golang.org/x/crypto/ssh"
+	"time"
+)
+
+func NewSSHClientConfig(user string, hostKeyCallback ssh.HostKeyCallback, authMethods ...ssh.AuthMethod) *ssh.ClientConfig {
+	return &ssh.ClientConfig{
+		Timeout:         30 * time.Second,
+		User:            user,
+		HostKeyCallback: hostKeyCallback,
+		Auth:            authMethods,
+	}
+}

vendor/github.com/cloudfoundry/socks5-proxy/ssh_test_server.go

@@ -0,0 +1,149 @@
+package proxy
+
+import (
+	"bufio"
+	"fmt"
+	"log"
+	"net"
+	"sync"
+	"time"
+
+	"golang.org/x/crypto/ssh"
+)
+
+const jb = "jumpbox"
+
+type checker struct {
+	expired         bool
+	timeout         time.Duration
+	lastMessageTime time.Time
+	sync.RWMutex
+}
+
+func (c *checker) check(reqs <-chan *ssh.Request) {
+	for {
+		select {
+		case req, ok := <-reqs:
+			if !ok {
+				continue
+			}
+
+			if req.Type == "bosh-cli-keep-alive@bosh.io" {
+				c.lastMessageTime = time.Now()
+			}
+
+			if req.WantReply {
+				req.Reply(false, nil)
+			}
+
+		default:
+			if c.lastMessageTime.Add(c.timeout).Before(time.Now()) {
+				c.Lock()
+				c.expired = true
+				c.Unlock()
+			}
+		}
+	}
+}
+
+func StartTestSSHServer(httpServerURL, sshPrivateKey, userName string) string {
+	if userName == "" {
+		userName = jb
+	}
+
+	signer, err := ssh.ParsePrivateKey([]byte(sshPrivateKey))
+	if err != nil {
+		log.Fatal("Failed to parse private key: ", err)
+	}
+
+	config := &ssh.ServerConfig{
+		PublicKeyCallback: func(c ssh.ConnMetadata, pubKey ssh.PublicKey) (*ssh.Permissions, error) {
+			if c.User() != userName {
+				return nil, fmt.Errorf("unknown user: %q", c.User())
+			}
+
+			if string(signer.PublicKey().Marshal()) == string(pubKey.Marshal()) {
+				return nil, nil
+			}
+			return nil, fmt.Errorf("unknown public key for %q", c.User())
+		},
+	}
+
+	config.AddHostKey(signer)
+
+	listener, err := net.Listen("tcp", "127.0.0.1:0")
+	if err != nil {
+		log.Fatal("failed to listen for connection: ", err)
+	}
+	c := &checker{
+		lastMessageTime: time.Now(),
+		timeout:         500 * time.Millisecond,
+	}
+
+	go func() {
+		for {
+			nConn, err := listener.Accept()
+			if err != nil {
+				log.Fatal("failed to accept incoming connection: ", err)
+			}
+
+			_, chans, reqs, err := ssh.NewServerConn(nConn, config)
+			if err != nil {
+				log.Println("failed to handshake: ", err)
+				continue
+			}
+
+			go c.check(reqs)
+
+			for newChannel := range chans {
+				if newChannel.ChannelType() != "direct-tcpip" {
+					newChannel.Reject(ssh.UnknownChannelType, "unknown channel type")
+					continue
+				}
+
+				c.RLock()
+				expired := c.expired
+				c.RUnlock()
+
+				if expired {
+					newChannel.Reject(ssh.ConnectionFailed, "no keepalive sent, you died")
+					continue
+				}
+
+				channel, _, err := newChannel.Accept()
+				if err != nil {
+					log.Fatalf("Could not accept channel: %v", err)
+				}
+				defer channel.Close()
+
+				data, err := bufio.NewReader(channel).ReadString('\n')
+				if err != nil {
+					log.Fatalf("Can't read data from channel: %v", err)
+				}
+
+				httpConn, err := net.Dial("tcp", httpServerURL)
+				if err != nil {
+					log.Fatalf("Could not open connection to http server: %v", err)
+				}
+				defer httpConn.Close()
+
+				_, err = httpConn.Write([]byte(data + "\r\n\r\n"))
+				if err != nil {
+					log.Fatalf("Could not write to http server: %v", err)
+				}
+
+				data, err = bufio.NewReader(httpConn).ReadString('\n')
+				if err != nil {
+					log.Fatalf("Can't read data from http conn: %v", err)
+				}
+
+				_, err = channel.Write([]byte(data))
+				if err != nil {
+					log.Fatalf("Can't write data to channel: %v", err)
+				}
+			}
+		}
+	}()
+
+	return listener.Addr().String()
+}