1 files changed, 0 insertions, 412 deletions
diff --git a/modules/crypto/ssh/handshake.go b/modules/crypto/ssh/handshake.go
deleted file mode 100755
index 1c54f75878..0000000000
--- a/modules/crypto/ssh/handshake.go
+++ /dev/null
@@ -1,412 +0,0 @@
-// Copyright 2013 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
-
-import (
-	"crypto/rand"
-	"errors"
-	"fmt"
-	"io"
-	"log"
-	"net"
-	"sync"
-)
-
-// debugHandshake, if set, prints messages sent and received.  Key
-// exchange messages are printed as if DH were used, so the debug
-// messages are wrong when using ECDH.
-const debugHandshake = false
-
-// keyingTransport is a packet based transport that supports key
-// changes. It need not be thread-safe. It should pass through
-// msgNewKeys in both directions.
-type keyingTransport interface {
-	packetConn
-
-	// prepareKeyChange sets up a key change. The key change for a
-	// direction will be effected if a msgNewKeys message is sent
-	// or received.
-	prepareKeyChange(*algorithms, *kexResult) error
-
-	// getSessionID returns the session ID. prepareKeyChange must
-	// have been called once.
-	getSessionID() []byte
-}
-
-// rekeyingTransport is the interface of handshakeTransport that we
-// (internally) expose to ClientConn and ServerConn.
-type rekeyingTransport interface {
-	packetConn
-
-	// requestKeyChange asks the remote side to change keys. All
-	// writes are blocked until the key change succeeds, which is
-	// signaled by reading a msgNewKeys.
-	requestKeyChange() error
-
-	// getSessionID returns the session ID. This is only valid
-	// after the first key change has completed.
-	getSessionID() []byte
-}
-
-// handshakeTransport implements rekeying on top of a keyingTransport
-// and offers a thread-safe writePacket() interface.
-type handshakeTransport struct {
-	conn   keyingTransport
-	config *Config
-
-	serverVersion []byte
-	clientVersion []byte
-
-	// hostKeys is non-empty if we are the server. In that case,
-	// it contains all host keys that can be used to sign the
-	// connection.
-	hostKeys []Signer
-
-	// hostKeyAlgorithms is non-empty if we are the client. In that case,
-	// we accept these key types from the server as host key.
-	hostKeyAlgorithms []string
-
-	// On read error, incoming is closed, and readError is set.
-	incoming  chan []byte
-	readError error
-
-	// data for host key checking
-	hostKeyCallback func(hostname string, remote net.Addr, key PublicKey) error
-	dialAddress     string
-	remoteAddr      net.Addr
-
-	readSinceKex uint64
-
-	// Protects the writing side of the connection
-	mu              sync.Mutex
-	cond            *sync.Cond
-	sentInitPacket  []byte
-	sentInitMsg     *kexInitMsg
-	writtenSinceKex uint64
-	writeError      error
-}
-
-func newHandshakeTransport(conn keyingTransport, config *Config, clientVersion, serverVersion []byte) *handshakeTransport {
-	t := &handshakeTransport{
-		conn:          conn,
-		serverVersion: serverVersion,
-		clientVersion: clientVersion,
-		incoming:      make(chan []byte, 16),
-		config:        config,
-	}
-	t.cond = sync.NewCond(&t.mu)
-	return t
-}
-
-func newClientTransport(conn keyingTransport, clientVersion, serverVersion []byte, config *ClientConfig, dialAddr string, addr net.Addr) *handshakeTransport {
-	t := newHandshakeTransport(conn, &config.Config, clientVersion, serverVersion)
-	t.dialAddress = dialAddr
-	t.remoteAddr = addr
-	t.hostKeyCallback = config.HostKeyCallback
-	if config.HostKeyAlgorithms != nil {
-		t.hostKeyAlgorithms = config.HostKeyAlgorithms
-	} else {
-		t.hostKeyAlgorithms = supportedHostKeyAlgos
-	}
-	go t.readLoop()
-	return t
-}
-
-func newServerTransport(conn keyingTransport, clientVersion, serverVersion []byte, config *ServerConfig) *handshakeTransport {
-	t := newHandshakeTransport(conn, &config.Config, clientVersion, serverVersion)
-	t.hostKeys = config.hostKeys
-	go t.readLoop()
-	return t
-}
-
-func (t *handshakeTransport) getSessionID() []byte {
-	return t.conn.getSessionID()
-}
-
-func (t *handshakeTransport) id() string {
-	if len(t.hostKeys) > 0 {
-		return "server"
-	}
-	return "client"
-}
-
-func (t *handshakeTransport) readPacket() ([]byte, error) {
-	p, ok := <-t.incoming
-	if !ok {
-		return nil, t.readError
-	}
-	return p, nil
-}
-
-func (t *handshakeTransport) readLoop() {
-	for {
-		p, err := t.readOnePacket()
-		if err != nil {
-			t.readError = err
-			close(t.incoming)
-			break
-		}
-		if p[0] == msgIgnore || p[0] == msgDebug {
-			continue
-		}
-		t.incoming <- p
-	}
-
-	// If we can't read, declare the writing part dead too.
-	t.mu.Lock()
-	defer t.mu.Unlock()
-	if t.writeError == nil {
-		t.writeError = t.readError
-	}
-	t.cond.Broadcast()
-}
-
-func (t *handshakeTransport) readOnePacket() ([]byte, error) {
-	if t.readSinceKex > t.config.RekeyThreshold {
-		if err := t.requestKeyChange(); err != nil {
-			return nil, err
-		}
-	}
-
-	p, err := t.conn.readPacket()
-	if err != nil {
-		return nil, err
-	}
-
-	t.readSinceKex += uint64(len(p))
-	if debugHandshake {
-		msg, err := decode(p)
-		log.Printf("%s got %T %v (%v)", t.id(), msg, msg, err)
-	}
-	if p[0] != msgKexInit {
-		return p, nil
-	}
-	err = t.enterKeyExchange(p)
-
-	t.mu.Lock()
-	if err != nil {
-		// drop connection
-		t.conn.Close()
-		t.writeError = err
-	}
-
-	if debugHandshake {
-		log.Printf("%s exited key exchange, err %v", t.id(), err)
-	}
-
-	// Unblock writers.
-	t.sentInitMsg = nil
-	t.sentInitPacket = nil
-	t.cond.Broadcast()
-	t.writtenSinceKex = 0
-	t.mu.Unlock()
-
-	if err != nil {
-		return nil, err
-	}
-
-	t.readSinceKex = 0
-	return []byte{msgNewKeys}, nil
-}
-
-// sendKexInit sends a key change message, and returns the message
-// that was sent. After initiating the key change, all writes will be
-// blocked until the change is done, and a failed key change will
-// close the underlying transport. This function is safe for
-// concurrent use by multiple goroutines.
-func (t *handshakeTransport) sendKexInit() (*kexInitMsg, []byte, error) {
-	t.mu.Lock()
-	defer t.mu.Unlock()
-	return t.sendKexInitLocked()
-}
-
-func (t *handshakeTransport) requestKeyChange() error {
-	_, _, err := t.sendKexInit()
-	return err
-}
-
-// sendKexInitLocked sends a key change message. t.mu must be locked
-// while this happens.
-func (t *handshakeTransport) sendKexInitLocked() (*kexInitMsg, []byte, error) {
-	// kexInits may be sent either in response to the other side,
-	// or because our side wants to initiate a key change, so we
-	// may have already sent a kexInit. In that case, don't send a
-	// second kexInit.
-	if t.sentInitMsg != nil {
-		return t.sentInitMsg, t.sentInitPacket, nil
-	}
-	msg := &kexInitMsg{
-		KexAlgos:                t.config.KeyExchanges,
-		CiphersClientServer:     t.config.Ciphers,
-		CiphersServerClient:     t.config.Ciphers,
-		MACsClientServer:        t.config.MACs,
-		MACsServerClient:        t.config.MACs,
-		CompressionClientServer: supportedCompressions,
-		CompressionServerClient: supportedCompressions,
-	}
-	io.ReadFull(rand.Reader, msg.Cookie[:])
-
-	if len(t.hostKeys) > 0 {
-		for _, k := range t.hostKeys {
-			msg.ServerHostKeyAlgos = append(
-				msg.ServerHostKeyAlgos, k.PublicKey().Type())
-		}
-	} else {
-		msg.ServerHostKeyAlgos = t.hostKeyAlgorithms
-	}
-	packet := Marshal(msg)
-
-	// writePacket destroys the contents, so save a copy.
-	packetCopy := make([]byte, len(packet))
-	copy(packetCopy, packet)
-
-	if err := t.conn.writePacket(packetCopy); err != nil {
-		return nil, nil, err
-	}
-
-	t.sentInitMsg = msg
-	t.sentInitPacket = packet
-	return msg, packet, nil
-}
-
-func (t *handshakeTransport) writePacket(p []byte) error {
-	t.mu.Lock()
-	defer t.mu.Unlock()
-
-	if t.writtenSinceKex > t.config.RekeyThreshold {
-		t.sendKexInitLocked()
-	}
-	for t.sentInitMsg != nil && t.writeError == nil {
-		t.cond.Wait()
-	}
-	if t.writeError != nil {
-		return t.writeError
-	}
-	t.writtenSinceKex += uint64(len(p))
-
-	switch p[0] {
-	case msgKexInit:
-		return errors.New("ssh: only handshakeTransport can send kexInit")
-	case msgNewKeys:
-		return errors.New("ssh: only handshakeTransport can send newKeys")
-	default:
-		return t.conn.writePacket(p)
-	}
-}
-
-func (t *handshakeTransport) Close() error {
-	return t.conn.Close()
-}
-
-// enterKeyExchange runs the key exchange.
-func (t *handshakeTransport) enterKeyExchange(otherInitPacket []byte) error {
-	if debugHandshake {
-		log.Printf("%s entered key exchange", t.id())
-	}
-	myInit, myInitPacket, err := t.sendKexInit()
-	if err != nil {
-		return err
-	}
-
-	otherInit := &kexInitMsg{}
-	if err := Unmarshal(otherInitPacket, otherInit); err != nil {
-		return err
-	}
-
-	magics := handshakeMagics{
-		clientVersion: t.clientVersion,
-		serverVersion: t.serverVersion,
-		clientKexInit: otherInitPacket,
-		serverKexInit: myInitPacket,
-	}
-
-	clientInit := otherInit
-	serverInit := myInit
-	if len(t.hostKeys) == 0 {
-		clientInit = myInit
-		serverInit = otherInit
-
-		magics.clientKexInit = myInitPacket
-		magics.serverKexInit = otherInitPacket
-	}
-
-	algs, err := findAgreedAlgorithms(clientInit, serverInit)
-	if err != nil {
-		return err
-	}
-
-	// We don't send FirstKexFollows, but we handle receiving it.
-	if otherInit.FirstKexFollows && algs.kex != otherInit.KexAlgos[0] {
-		// other side sent a kex message for the wrong algorithm,
-		// which we have to ignore.
-		if _, err := t.conn.readPacket(); err != nil {
-			return err
-		}
-	}
-
-	kex, ok := kexAlgoMap[algs.kex]
-	if !ok {
-		return fmt.Errorf("ssh: unexpected key exchange algorithm %v", algs.kex)
-	}
-
-	var result *kexResult
-	if len(t.hostKeys) > 0 {
-		result, err = t.server(kex, algs, &magics)
-	} else {
-		result, err = t.client(kex, algs, &magics)
-	}
-
-	if err != nil {
-		return err
-	}
-
-	t.conn.prepareKeyChange(algs, result)
-	if err = t.conn.writePacket([]byte{msgNewKeys}); err != nil {
-		return err
-	}
-	if packet, err := t.conn.readPacket(); err != nil {
-		return err
-	} else if packet[0] != msgNewKeys {
-		return unexpectedMessageError(msgNewKeys, packet[0])
-	}
-	return nil
-}
-
-func (t *handshakeTransport) server(kex kexAlgorithm, algs *algorithms, magics *handshakeMagics) (*kexResult, error) {
-	var hostKey Signer
-	for _, k := range t.hostKeys {
-		if algs.hostKey == k.PublicKey().Type() {
-			hostKey = k
-		}
-	}
-
-	r, err := kex.Server(t.conn, t.config.Rand, magics, hostKey)
-	return r, err
-}
-
-func (t *handshakeTransport) client(kex kexAlgorithm, algs *algorithms, magics *handshakeMagics) (*kexResult, error) {
-	result, err := kex.Client(t.conn, t.config.Rand, magics)
-	if err != nil {
-		return nil, err
-	}
-
-	hostKey, err := ParsePublicKey(result.HostKey)
-	if err != nil {
-		return nil, err
-	}
-
-	if err := verifyHostKeySignature(hostKey, result); err != nil {
-		return nil, err
-	}
-
-	if t.hostKeyCallback != nil {
-		err = t.hostKeyCallback(t.dialAddress, t.remoteAddr, hostKey)
-		if err != nil {
-			return nil, err
-		}
-	}
-
-	return result, nil
-}