/
dialer.go
160 lines (136 loc) · 3.41 KB
/
dialer.go
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package sshd
import (
"context"
"errors"
"net"
"sync"
"time"
"github.com/go-gost/core/dialer"
md "github.com/go-gost/core/metadata"
ssh_util "github.com/hxdcloud/gost-x/internal/util/ssh"
"github.com/hxdcloud/gost-x/registry"
"golang.org/x/crypto/ssh"
)
func init() {
registry.DialerRegistry().Register("sshd", NewDialer)
}
type sshdDialer struct {
sessions map[string]*sshSession
sessionMutex sync.Mutex
md metadata
options dialer.Options
}
func NewDialer(opts ...dialer.Option) dialer.Dialer {
options := dialer.Options{}
for _, opt := range opts {
opt(&options)
}
return &sshdDialer{
sessions: make(map[string]*sshSession),
options: options,
}
}
func (d *sshdDialer) Init(md md.Metadata) (err error) {
if err = d.parseMetadata(md); err != nil {
return
}
return nil
}
// Multiplex implements dialer.Multiplexer interface.
func (d *sshdDialer) Multiplex() bool {
return true
}
func (d *sshdDialer) Dial(ctx context.Context, addr string, opts ...dialer.DialOption) (conn net.Conn, err error) {
d.sessionMutex.Lock()
defer d.sessionMutex.Unlock()
session, ok := d.sessions[addr]
if session != nil && session.IsClosed() {
delete(d.sessions, addr) // session is dead
ok = false
}
if !ok {
var options dialer.DialOptions
for _, opt := range opts {
opt(&options)
}
conn, err = options.NetDialer.Dial(ctx, "tcp", addr)
if err != nil {
return
}
session = &sshSession{
addr: addr,
conn: conn,
}
d.sessions[addr] = session
}
return session.conn, err
}
// Handshake implements dialer.Handshaker
func (d *sshdDialer) Handshake(ctx context.Context, conn net.Conn, options ...dialer.HandshakeOption) (net.Conn, error) {
opts := &dialer.HandshakeOptions{}
for _, option := range options {
option(opts)
}
d.sessionMutex.Lock()
defer d.sessionMutex.Unlock()
if d.md.handshakeTimeout > 0 {
conn.SetDeadline(time.Now().Add(d.md.handshakeTimeout))
defer conn.SetDeadline(time.Time{})
}
log := d.options.Logger
session, ok := d.sessions[opts.Addr]
if session != nil && session.conn != conn {
err := errors.New("ssh: unrecognized connection")
log.Error(err)
conn.Close()
delete(d.sessions, opts.Addr)
return nil, err
}
if !ok || session.client == nil {
s, err := d.initSession(ctx, opts.Addr, conn)
if err != nil {
log.Error(err)
conn.Close()
delete(d.sessions, opts.Addr)
return nil, err
}
session = s
go func() {
s.wait()
log.Debug("session closed")
}()
d.sessions[opts.Addr] = session
}
if session.IsClosed() {
delete(d.sessions, opts.Addr)
return nil, ssh_util.ErrSessionDead
}
return ssh_util.NewClientConn(session.conn, session.client), nil
}
func (d *sshdDialer) initSession(ctx context.Context, addr string, conn net.Conn) (*sshSession, error) {
config := ssh.ClientConfig{
// Timeout: timeout,
HostKeyCallback: ssh.InsecureIgnoreHostKey(),
}
if d.options.Auth != nil {
config.User = d.options.Auth.Username()
if password, _ := d.options.Auth.Password(); password != "" {
config.Auth = []ssh.AuthMethod{
ssh.Password(password),
}
}
}
if d.md.signer != nil {
config.Auth = append(config.Auth, ssh.PublicKeys(d.md.signer))
}
sshConn, chans, reqs, err := ssh.NewClientConn(conn, addr, &config)
if err != nil {
return nil, err
}
return &sshSession{
conn: conn,
client: ssh.NewClient(sshConn, chans, reqs),
closed: make(chan struct{}),
dead: make(chan struct{}),
}, nil
}