forked from blacknon/lssh
/
connect.go
164 lines (132 loc) · 4.15 KB
/
connect.go
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// Copyright (c) 2019 Blacknon. All rights reserved.
// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
package ssh
import (
"fmt"
"strings"
"time"
"github.com/bingoohuang/bssh/misc"
"github.com/bingoohuang/gonet"
"github.com/bingoohuang/bssh/conf"
sshlib "github.com/blacknon/go-sshlib"
"golang.org/x/net/proxy"
)
// CreateSSHConnect return *sshlib.Connect
// this vaule in ssh.Client with proxy.
func (r *Run) CreateSSHConnect(server string) (connect *sshlib.Connect, err error) {
// create proxyRoute
proxyRoute, err := getProxyRoute(server, r.Conf)
if err != nil {
return
}
// Connect ssh-agent
if r.agent == nil {
r.agent = sshlib.ConnectSshAgent()
}
// setup dialer
var dialer proxy.Dialer = gonet.DialerTimeoutBean{ConnTimeout: 10 * time.Second} // nolint:gomnd
// Connect loop proxy server
for _, p := range proxyRoute {
config := r.Conf
switch p.Type {
case misc.HTTP, misc.HTTPS, misc.Socks, misc.Socks5:
c := config.Proxy[p.Name]
pxy := &sshlib.Proxy{Type: p.Type, Forwarder: dialer, Addr: c.Addr, Port: c.Port, User: c.User, Password: c.Pass}
dialer, err = pxy.CreateProxyDialer()
case misc.Command:
dialer, err = (&sshlib.Proxy{Type: p.Type, Command: p.Name}).CreateProxyDialer()
default:
c := config.Server[p.Name]
pxy := &sshlib.Connect{ProxyDialer: dialer}
err := pxy.CreateClient(c.Addr, c.Port, c.User, r.serverAuthMethodMap[p.Name])
if err != nil {
return connect, err
}
dialer = pxy.Client
}
}
if err != nil {
return nil, err
}
s, ok := r.Conf.Server[server] // server conf
isTempHost := !ok
if isTempHost {
s, _ = r.parseDirectServer(server)
}
x11 := s.X11 || r.X11 // set x11
// connect target server
connect = &sshlib.Connect{
ProxyDialer: dialer, ForwardAgent: s.SSHAgentUse,
Agent: r.agent, ForwardX11: x11, TTY: r.IsTerm, ConnectTimeout: s.ConnectTimeout,
SendKeepAliveMax: s.ServerAliveCountMax, SendKeepAliveInterval: s.ServerAliveCountInterval,
}
err = connect.CreateClient(s.Addr, s.Port, s.User, r.serverAuthMethodMap[server])
if err != nil && isTempHost {
r.Conf.WriteTempHosts(server)
}
return connect, err
}
// proxyRouteData is proxy struct.
type proxyRouteData struct {
Name string
Type string
Port string
}
// getProxyList return []*pxy function.
func getProxyRoute(server string, config conf.Config) (proxyRoute []*proxyRouteData, err error) {
var conName, conType, proxyName, proxyType, proxyPort string
isOk := false
conName, conType = server, misc.SSH
proxyLoop:
for {
switch conType {
case misc.HTTP, misc.HTTPS, misc.Socks, misc.Socks5:
var conConf conf.ProxyConfig
conConf, isOk = config.Proxy[conName]
proxyName, proxyType, proxyPort = conConf.Proxy, conConf.ProxyType, conConf.Port
case misc.Command:
break proxyLoop
default:
var conConf conf.ServerConfig
conConf, isOk = config.Server[conName]
// If ProxyCommand is set, give priority to that
switch proxyCommand := conConf.ProxyCommand; proxyCommand {
case "", "none":
proxyName, proxyType, proxyPort = conConf.Proxy, conConf.ProxyType, conConf.Port
default:
proxyName, proxyType, proxyPort = expandProxyCommand(proxyCommand, conConf), misc.Command, ""
}
}
// not use proxy
if proxyName == "" {
break
}
if !isOk {
err = fmt.Errorf("not Found proxy : %s", server) // nolint:goerr113
return nil, err
}
p := &proxyRouteData{Name: proxyName}
switch proxyType {
case misc.HTTP, misc.HTTPS, misc.Socks, misc.Socks5, misc.Command:
p.Type = proxyType
default:
p.Type = misc.SSH
}
p.Port = proxyPort
proxyRoute = append(proxyRoute, p)
conName, conType = proxyName, proxyType
}
// reverse proxy slice
for i, j := 0, len(proxyRoute)-1; i < j; i, j = i+1, j-1 {
proxyRoute[i], proxyRoute[j] = proxyRoute[j], proxyRoute[i]
}
return proxyRoute, err
}
func expandProxyCommand(proxyCommand string, config conf.ServerConfig) string {
// replace variable
proxyCommand = strings.Replace(proxyCommand, "%h", config.Addr, -1)
proxyCommand = strings.Replace(proxyCommand, "%p", config.Port, -1)
proxyCommand = strings.Replace(proxyCommand, "%r", config.User, -1)
return proxyCommand
}