internal/ssh: ignore env command totally (go-gitea#6825)

* ssh: ignore env command totally

* Remove commented code 

Needed fix described in issue go-gitea#6889

Author: sapk

modules/ssh/ssh.go

@@ -52,18 +52,6 @@ func handleServerConn(keyID string, chans <-chan ssh.NewChannel) {
 			for req := range in {
 				payload := cleanCommand(string(req.Payload))
 				switch req.Type {
-				case "env":
-					args := strings.Split(strings.Replace(payload, "\x00", "", -1), "\v")
-					if len(args) != 2 {
-						log.Warn("SSH: Invalid env arguments: '%#v'", args)
-						continue
-					}
-					args[0] = strings.TrimLeft(args[0], "\x04")
-					_, _, err := com.ExecCmdBytes("env", args[0]+"="+args[1])
-					if err != nil {
-						log.Error("env: %v", err)
-						return
-					}
 				case "exec":
 					cmdName := strings.TrimLeft(payload, "'()")
 					log.Trace("SSH: Payload: %v", cmdName)