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requests.go
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requests.go
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package sshmuxer
import (
"fmt"
"io/ioutil"
"log"
"net"
"os"
"strconv"
"sync"
"github.com/antoniomika/sish/utils"
"github.com/logrusorgru/aurora"
"github.com/pires/go-proxyproto"
"github.com/spf13/viper"
"golang.org/x/crypto/ssh"
)
// channelForwardMsg is the message sent by SSH
// to init a forwarded connection.
type channelForwardMsg struct {
Addr string
Rport uint32
}
// channelForwardReply defines the reply to inform the client what port was
// actually assigned https://tools.ietf.org/html/rfc4254#section-7.1
type channelForwardReply struct {
Rport uint32
}
// forwardedTCPPayload is the payload sent by SSH
// to init a forwarded connection.
type forwardedTCPPayload struct {
Addr string
Port uint32
OriginAddr string
OriginPort uint32
}
// handleRemoteForward will handle a remote forward request
// and stand up the relevant listeners.
func handleRemoteForward(newRequest *ssh.Request, sshConn *utils.SSHConnection, state *utils.State) {
cleanupOnce := &sync.Once{}
check := &channelForwardMsg{}
err := ssh.Unmarshal(newRequest.Payload, check)
if err != nil {
log.Println("Error unmarshaling remote forward payload:", err)
}
bindPort := check.Rport
stringPort := strconv.FormatUint(uint64(bindPort), 10)
listenerType := utils.HTTPListener
if bindPort != uint32(80) && bindPort != uint32(443) {
testAddr := net.ParseIP(check.Addr)
if viper.GetBool("tcp-aliases") && check.Addr != "localhost" && testAddr == nil {
listenerType = utils.AliasListener
} else if check.Addr == "localhost" || testAddr != nil {
listenerType = utils.TCPListener
}
}
tmpfile, err := ioutil.TempFile("", sshConn.SSHConn.RemoteAddr().String()+":"+stringPort)
if err != nil {
err = newRequest.Reply(false, nil)
if err != nil {
log.Println("Error replying to socket request:", err)
}
return
}
os.Remove(tmpfile.Name())
listenAddr := tmpfile.Name()
chanListener, err := net.Listen("unix", listenAddr)
if err != nil {
err = newRequest.Reply(false, nil)
if err != nil {
log.Println("Error replying to socket request:", err)
}
return
}
listenerHolder := &utils.ListenerHolder{
ListenAddr: listenAddr,
Listener: chanListener,
Type: listenerType,
SSHConn: sshConn,
}
state.Listeners.Store(listenAddr, listenerHolder)
sshConn.Listeners.Store(listenAddr, listenerHolder)
deferHandler := func() {}
cleanupChanListener := func() {
listenerHolder.Close()
state.Listeners.Delete(listenAddr)
sshConn.Listeners.Delete(listenAddr)
os.Remove(listenAddr)
deferHandler()
}
go func() {
<-sshConn.Close
cleanupOnce.Do(cleanupChanListener)
}()
connType := "tcp"
if stringPort == "80" {
connType = "http"
} else if stringPort == "443" {
connType = "https"
}
portChannelForwardReplyPayload := channelForwardReply{bindPort}
mainRequestMessages := fmt.Sprintf("Starting SSH Forwarding service for %s. Forwarded connections can be accessed via the following methods:\r\n", aurora.Sprintf(aurora.Green("%s:%s"), connType, stringPort))
switch listenerType {
case utils.HTTPListener:
pH, serverURL, host, requestMessages, err := handleHTTPListener(check, stringPort, mainRequestMessages, listenerHolder, state, sshConn)
if err != nil {
err = newRequest.Reply(false, nil)
if err != nil {
log.Println("Error replying to socket request:", err)
}
return
}
mainRequestMessages = requestMessages
deferHandler = func() {
err := pH.Balancer.RemoveServer(serverURL)
if err != nil {
log.Println("Unable to remove server from balancer:", err)
}
pH.SSHConnections.Delete(listenerHolder.Addr().String())
if len(pH.Balancer.Servers()) == 0 {
state.HTTPListeners.Delete(host)
if viper.GetBool("admin-console") || viper.GetBool("service-console") {
state.Console.RemoveRoute(host)
}
}
}
case utils.AliasListener:
aH, serverURL, validAlias, requestMessages, err := handleAliasListener(check, stringPort, mainRequestMessages, listenerHolder, state, sshConn)
if err != nil {
err = newRequest.Reply(false, nil)
if err != nil {
log.Println("Error replying to socket request:", err)
}
return
}
mainRequestMessages = requestMessages
deferHandler = func() {
err := aH.Balancer.RemoveServer(serverURL)
if err != nil {
log.Println("Unable to remove server from balancer:", err)
}
aH.SSHConnections.Delete(listenerHolder.Addr().String())
if len(aH.Balancer.Servers()) == 0 {
state.AliasListeners.Delete(validAlias)
}
}
case utils.TCPListener:
tH, serverURL, tcpAddr, requestMessages, err := handleTCPListener(check, bindPort, mainRequestMessages, listenerHolder, state, sshConn)
if err != nil {
err = newRequest.Reply(false, nil)
if err != nil {
log.Println("Error replying to socket request:", err)
}
return
}
portChannelForwardReplyPayload.Rport = uint32(tH.Listener.Addr().(*net.TCPAddr).Port)
mainRequestMessages = requestMessages
go tH.Handle(state)
deferHandler = func() {
err := tH.Balancer.RemoveServer(serverURL)
if err != nil {
log.Println("Unable to remove server from balancer:", err)
}
tH.SSHConnections.Delete(listenerHolder.Addr().String())
if len(tH.Balancer.Servers()) == 0 {
tH.Listener.Close()
state.Listeners.Delete(tcpAddr)
state.TCPListeners.Delete(tcpAddr)
}
}
}
if check.Rport != 0 {
portChannelForwardReplyPayload.Rport = check.Rport
}
err = newRequest.Reply(true, ssh.Marshal(portChannelForwardReplyPayload))
if err != nil {
log.Println("Error replying to port forwarding request:", err)
return
}
sshConn.SendMessage(mainRequestMessages, true)
go func() {
defer cleanupOnce.Do(cleanupChanListener)
for {
cl, err := listenerHolder.Accept()
if err != nil {
break
}
resp := &forwardedTCPPayload{
Addr: check.Addr,
Port: portChannelForwardReplyPayload.Rport,
OriginAddr: check.Addr,
OriginPort: portChannelForwardReplyPayload.Rport,
}
newChan, newReqs, err := sshConn.SSHConn.OpenChannel("forwarded-tcpip", ssh.Marshal(resp))
if err != nil {
sshConn.SendMessage(err.Error(), true)
cl.Close()
continue
}
if sshConn.ProxyProto != 0 && listenerType == utils.TCPListener {
var sourceInfo *net.TCPAddr
var destInfo *net.TCPAddr
if _, ok := cl.RemoteAddr().(*net.TCPAddr); !ok {
sourceInfo = sshConn.SSHConn.RemoteAddr().(*net.TCPAddr)
destInfo = sshConn.SSHConn.LocalAddr().(*net.TCPAddr)
} else {
sourceInfo = cl.RemoteAddr().(*net.TCPAddr)
destInfo = cl.LocalAddr().(*net.TCPAddr)
}
proxyProtoHeader := proxyproto.Header{
Version: sshConn.ProxyProto,
Command: proxyproto.ProtocolVersionAndCommand(proxyproto.PROXY),
TransportProtocol: proxyproto.AddressFamilyAndProtocol(proxyproto.TCPv4),
SourceAddr: sourceInfo,
DestinationAddr: destInfo,
}
_, err := proxyProtoHeader.WriteTo(newChan)
if err != nil && viper.GetBool("debug") {
log.Println("Error writing to channel:", err)
}
}
go utils.CopyBoth(cl, newChan)
go ssh.DiscardRequests(newReqs)
}
}()
}