1206 lines
27 KiB
Go
1206 lines
27 KiB
Go
// Copyright 2018 The goftp Authors. All rights reserved.
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// Use of this source code is governed by a MIT-style
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// license that can be found in the LICENSE file.
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package server
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import (
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"encoding/binary"
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"fmt"
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"log"
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"strconv"
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"strings"
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)
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type Command interface {
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IsExtend() bool
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RequireParam() bool
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RequireAuth() bool
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Execute(*Conn, string)
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}
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type commandMap map[string]Command
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var (
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commands = commandMap{
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"ADAT": commandAdat{},
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"ALLO": commandAllo{},
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"APPE": commandAppe{},
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"AUTH": commandAuth{},
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"CDUP": commandCdup{},
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"CWD": commandCwd{},
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"CCC": commandCcc{},
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"CONF": commandConf{},
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"DELE": commandDele{},
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"ENC": commandEnc{},
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"EPRT": commandEprt{},
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"EPSV": commandEpsv{},
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"FEAT": commandFeat{},
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"LIST": commandList{},
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"LPRT": commandLprt{},
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"NLST": commandNlst{},
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"MDTM": commandMdtm{},
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"MIC": commandMic{},
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"MKD": commandMkd{},
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"MODE": commandMode{},
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"NOOP": commandNoop{},
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"OPTS": commandOpts{},
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"PASS": commandPass{},
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"PASV": commandPasv{},
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"PBSZ": commandPbsz{},
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"PORT": commandPort{},
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"PROT": commandProt{},
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"PWD": commandPwd{},
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"QUIT": commandQuit{},
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"RETR": commandRetr{},
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"REST": commandRest{},
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"RNFR": commandRnfr{},
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"RNTO": commandRnto{},
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"RMD": commandRmd{},
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"SIZE": commandSize{},
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"STOR": commandStor{},
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"STRU": commandStru{},
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"SYST": commandSyst{},
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"TYPE": commandType{},
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"USER": commandUser{},
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"XCUP": commandCdup{},
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"XCWD": commandCwd{},
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"XMKD": commandMkd{},
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"XPWD": commandPwd{},
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"XRMD": commandRmd{},
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}
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)
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// commandAllo responds to the ALLO FTP command.
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//
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// This is essentially a ping from the client so we just respond with an
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// basic OK message.
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type commandAllo struct{}
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func (cmd commandAllo) IsExtend() bool {
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return false
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}
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func (cmd commandAllo) RequireParam() bool {
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return false
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}
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func (cmd commandAllo) RequireAuth() bool {
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return false
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}
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func (cmd commandAllo) Execute(conn *Conn, param string) {
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conn.writeMessage(202, "Obsolete")
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}
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// commandAppe responds to the APPE FTP command. It allows the user to upload a
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// new file but always append if file exists otherwise create one.
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type commandAppe struct{}
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func (cmd commandAppe) IsExtend() bool {
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return false
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}
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func (cmd commandAppe) RequireParam() bool {
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return true
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}
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func (cmd commandAppe) RequireAuth() bool {
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return true
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}
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func (cmd commandAppe) Execute(conn *Conn, param string) {
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targetPath := conn.buildPath(param)
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conn.writeMessage(150, "Data transfer starting")
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bytes, err := conn.driver.PutFile(targetPath, conn.dataConn, true)
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if err == nil {
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msg := "OK, received " + strconv.Itoa(int(bytes)) + " bytes"
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conn.writeMessage(226, msg)
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} else {
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conn.writeMessage(450, fmt.Sprint("error during transfer: ", err))
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}
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}
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type commandOpts struct{}
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func (cmd commandOpts) IsExtend() bool {
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return false
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}
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func (cmd commandOpts) RequireParam() bool {
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return false
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}
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func (cmd commandOpts) RequireAuth() bool {
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return false
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}
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func (cmd commandOpts) Execute(conn *Conn, param string) {
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parts := strings.Fields(param)
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if len(parts) != 2 {
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conn.writeMessage(550, "Unknow params")
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return
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}
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if strings.ToUpper(parts[0]) != "UTF8" {
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conn.writeMessage(550, "Unknow params")
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return
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}
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if strings.ToUpper(parts[1]) == "ON" {
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conn.writeMessage(200, "UTF8 mode enabled")
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} else {
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conn.writeMessage(550, "Unsupported non-utf8 mode")
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}
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}
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type commandFeat struct{}
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func (cmd commandFeat) IsExtend() bool {
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return false
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}
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func (cmd commandFeat) RequireParam() bool {
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return false
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}
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func (cmd commandFeat) RequireAuth() bool {
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return false
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}
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var (
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feats = "Extensions supported:\n%s"
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featCmds = " UTF8\n"
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)
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func init() {
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for k, v := range commands {
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if v.IsExtend() {
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featCmds = featCmds + " " + k + "\n"
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}
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}
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}
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func (cmd commandFeat) Execute(conn *Conn, param string) {
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conn.writeMessageMultiline(211, conn.server.feats)
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}
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// cmdCdup responds to the CDUP FTP command.
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//
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// Allows the client change their current directory to the parent.
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type commandCdup struct{}
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func (cmd commandCdup) IsExtend() bool {
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return false
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}
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func (cmd commandCdup) RequireParam() bool {
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return false
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}
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func (cmd commandCdup) RequireAuth() bool {
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return true
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}
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func (cmd commandCdup) Execute(conn *Conn, param string) {
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otherCmd := &commandCwd{}
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otherCmd.Execute(conn, "..")
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}
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// commandCwd responds to the CWD FTP command. It allows the client to change the
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// current working directory.
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type commandCwd struct{}
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func (cmd commandCwd) IsExtend() bool {
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return false
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}
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func (cmd commandCwd) RequireParam() bool {
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return true
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}
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func (cmd commandCwd) RequireAuth() bool {
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return true
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}
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func (cmd commandCwd) Execute(conn *Conn, param string) {
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path := conn.buildPath(param)
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err := conn.driver.ChangeDir(path)
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if err == nil {
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conn.namePrefix = path
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conn.writeMessage(250, "Directory changed to "+path)
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} else {
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conn.writeMessage(550, fmt.Sprint("Directory change to ", path, " failed: ", err))
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}
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}
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// commandDele responds to the DELE FTP command. It allows the client to delete
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// a file
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type commandDele struct{}
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func (cmd commandDele) IsExtend() bool {
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return false
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}
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func (cmd commandDele) RequireParam() bool {
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return true
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}
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func (cmd commandDele) RequireAuth() bool {
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return true
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}
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func (cmd commandDele) Execute(conn *Conn, param string) {
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path := conn.buildPath(param)
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err := conn.driver.DeleteFile(path)
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if err == nil {
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conn.writeMessage(250, "File deleted")
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} else {
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conn.writeMessage(550, fmt.Sprint("File delete failed: ", err))
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}
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}
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// commandEprt responds to the EPRT FTP command. It allows the client to
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// request an active data socket with more options than the original PORT
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// command. It mainly adds ipv6 support.
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type commandEprt struct{}
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func (cmd commandEprt) IsExtend() bool {
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return true
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}
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func (cmd commandEprt) RequireParam() bool {
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return true
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}
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func (cmd commandEprt) RequireAuth() bool {
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return true
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}
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func (cmd commandEprt) Execute(conn *Conn, param string) {
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delim := string(param[0:1])
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parts := strings.Split(param, delim)
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addressFamily, err := strconv.Atoi(parts[1])
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host := parts[2]
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port, err := strconv.Atoi(parts[3])
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if addressFamily != 1 && addressFamily != 2 {
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conn.writeMessage(522, "Network protocol not supported, use (1,2)")
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return
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}
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socket, err := newActiveSocket(host, port, conn.logger, conn.sessionID)
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if err != nil {
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conn.writeMessage(425, "Data connection failed")
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return
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}
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conn.dataConn = socket
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conn.writeMessage(200, "Connection established ("+strconv.Itoa(port)+")")
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}
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// commandLprt responds to the LPRT FTP command. It allows the client to
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// request an active data socket with more options than the original PORT
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// command. FTP Operation Over Big Address Records.
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type commandLprt struct{}
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func (cmd commandLprt) IsExtend() bool {
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return true
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}
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func (cmd commandLprt) RequireParam() bool {
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return true
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}
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func (cmd commandLprt) RequireAuth() bool {
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return true
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}
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func (cmd commandLprt) Execute(conn *Conn, param string) {
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// No tests for this code yet
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parts := strings.Split(param, ",")
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addressFamily, err := strconv.Atoi(parts[0])
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if addressFamily != 4 {
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conn.writeMessage(522, "Network protocol not supported, use 4")
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return
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}
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addressLength, err := strconv.Atoi(parts[1])
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if addressLength != 4 {
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conn.writeMessage(522, "Network IP length not supported, use 4")
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return
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}
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host := strings.Join(parts[2:2+addressLength], ".")
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portLength, err := strconv.Atoi(parts[2+addressLength])
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portAddress := parts[3+addressLength : 3+addressLength+portLength]
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// Convert string[] to byte[]
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portBytes := make([]byte, portLength)
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for i := range portAddress {
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p, _ := strconv.Atoi(portAddress[i])
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portBytes[i] = byte(p)
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}
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// convert the bytes to an int
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port := int(binary.BigEndian.Uint16(portBytes))
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// if the existing connection is on the same host/port don't reconnect
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if conn.dataConn.Host() == host && conn.dataConn.Port() == port {
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return
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}
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socket, err := newActiveSocket(host, port, conn.logger, conn.sessionID)
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if err != nil {
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conn.writeMessage(425, "Data connection failed")
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return
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}
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conn.dataConn = socket
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conn.writeMessage(200, "Connection established ("+strconv.Itoa(port)+")")
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}
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// commandEpsv responds to the EPSV FTP command. It allows the client to
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// request a passive data socket with more options than the original PASV
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// command. It mainly adds ipv6 support, although we don't support that yet.
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type commandEpsv struct{}
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func (cmd commandEpsv) IsExtend() bool {
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return true
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}
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func (cmd commandEpsv) RequireParam() bool {
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return false
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}
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func (cmd commandEpsv) RequireAuth() bool {
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return true
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}
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func (cmd commandEpsv) Execute(conn *Conn, param string) {
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addr := conn.passiveListenIP()
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socket, err := newPassiveSocket(addr, conn.PassivePort, conn.logger, conn.sessionID, conn.tlsConfig)
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if err != nil {
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log.Println(err)
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conn.writeMessage(425, "Data connection failed")
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return
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}
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conn.dataConn = socket
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msg := fmt.Sprintf("Entering Extended Passive Mode (|||%d|)", socket.Port())
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conn.writeMessage(229, msg)
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}
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// commandList responds to the LIST FTP command. It allows the client to retreive
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// a detailed listing of the contents of a directory.
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type commandList struct{}
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func (cmd commandList) IsExtend() bool {
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return false
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}
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func (cmd commandList) RequireParam() bool {
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return false
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}
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func (cmd commandList) RequireAuth() bool {
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return true
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}
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func (cmd commandList) Execute(conn *Conn, param string) {
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path := conn.buildPath(parseListParam(param))
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info, err := conn.driver.Stat(path)
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if err != nil {
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conn.writeMessage(550, err.Error())
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return
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}
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if info == nil {
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conn.logger.Printf(conn.sessionID, "%s: no such file or directory.\n", path)
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return
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}
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var files []FileInfo
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if info.IsDir() {
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err = conn.driver.ListDir(path, func(f FileInfo) error {
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files = append(files, f)
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return nil
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})
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if err != nil {
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conn.writeMessage(550, err.Error())
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return
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}
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} else {
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files = append(files, info)
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}
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conn.writeMessage(150, "Opening ASCII mode data connection for file list")
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conn.sendOutofbandData(listFormatter(files).Detailed())
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}
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func parseListParam(param string) (path string) {
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if len(param) == 0 {
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path = param
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} else {
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fields := strings.Fields(param)
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i := 0
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for _, field := range fields {
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if !strings.HasPrefix(field, "-") {
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break
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}
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i = strings.LastIndex(param, " "+field) + len(field) + 1
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}
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path = strings.TrimLeft(param[i:], " ") //Get all the path even with space inside
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}
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return path
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}
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// commandNlst responds to the NLST FTP command. It allows the client to
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// retreive a list of filenames in the current directory.
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type commandNlst struct{}
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func (cmd commandNlst) IsExtend() bool {
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return false
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}
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func (cmd commandNlst) RequireParam() bool {
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return false
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}
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func (cmd commandNlst) RequireAuth() bool {
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return true
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}
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func (cmd commandNlst) Execute(conn *Conn, param string) {
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path := conn.buildPath(parseListParam(param))
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info, err := conn.driver.Stat(path)
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if err != nil {
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conn.writeMessage(550, err.Error())
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return
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}
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if !info.IsDir() {
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conn.writeMessage(550, param+" is not a directory")
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return
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}
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var files []FileInfo
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err = conn.driver.ListDir(path, func(f FileInfo) error {
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files = append(files, f)
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return nil
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})
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if err != nil {
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conn.writeMessage(550, err.Error())
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return
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}
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conn.writeMessage(150, "Opening ASCII mode data connection for file list")
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conn.sendOutofbandData(listFormatter(files).Short())
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}
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// commandMdtm responds to the MDTM FTP command. It allows the client to
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// retreive the last modified time of a file.
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type commandMdtm struct{}
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func (cmd commandMdtm) IsExtend() bool {
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return false
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}
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func (cmd commandMdtm) RequireParam() bool {
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return true
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}
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func (cmd commandMdtm) RequireAuth() bool {
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return true
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}
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func (cmd commandMdtm) Execute(conn *Conn, param string) {
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path := conn.buildPath(param)
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stat, err := conn.driver.Stat(path)
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if err == nil {
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conn.writeMessage(213, stat.ModTime().Format("20060102150405"))
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} else {
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conn.writeMessage(450, "File not available")
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}
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}
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// commandMkd responds to the MKD FTP command. It allows the client to create
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// a new directory
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type commandMkd struct{}
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func (cmd commandMkd) IsExtend() bool {
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return false
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}
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func (cmd commandMkd) RequireParam() bool {
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return true
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}
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func (cmd commandMkd) RequireAuth() bool {
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return true
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}
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func (cmd commandMkd) Execute(conn *Conn, param string) {
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path := conn.buildPath(param)
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err := conn.driver.MakeDir(path)
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if err == nil {
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conn.writeMessage(257, "Directory created")
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} else {
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conn.writeMessage(550, fmt.Sprint("Action not taken: ", err))
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}
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}
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// cmdMode responds to the MODE FTP command.
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//
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// the original FTP spec had various options for hosts to negotiate how data
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// would be sent over the data socket, In reality these days (S)tream mode
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// is all that is used for the mode - data is just streamed down the data
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// socket unchanged.
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type commandMode struct{}
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func (cmd commandMode) IsExtend() bool {
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return false
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}
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func (cmd commandMode) RequireParam() bool {
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return true
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}
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func (cmd commandMode) RequireAuth() bool {
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return true
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}
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func (cmd commandMode) Execute(conn *Conn, param string) {
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if strings.ToUpper(param) == "S" {
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conn.writeMessage(200, "OK")
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} else {
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conn.writeMessage(504, "MODE is an obsolete command")
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}
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}
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// cmdNoop responds to the NOOP FTP command.
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//
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// This is essentially a ping from the client so we just respond with an
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// basic 200 message.
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type commandNoop struct{}
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func (cmd commandNoop) IsExtend() bool {
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return false
|
|
}
|
|
|
|
func (cmd commandNoop) RequireParam() bool {
|
|
return false
|
|
}
|
|
|
|
func (cmd commandNoop) RequireAuth() bool {
|
|
return false
|
|
}
|
|
|
|
func (cmd commandNoop) Execute(conn *Conn, param string) {
|
|
conn.writeMessage(200, "OK")
|
|
}
|
|
|
|
// commandPass respond to the PASS FTP command by asking the driver if the
|
|
// supplied username and password are valid
|
|
type commandPass struct{}
|
|
|
|
func (cmd commandPass) IsExtend() bool {
|
|
return false
|
|
}
|
|
|
|
func (cmd commandPass) RequireParam() bool {
|
|
return true
|
|
}
|
|
|
|
func (cmd commandPass) RequireAuth() bool {
|
|
return false
|
|
}
|
|
|
|
func (cmd commandPass) Execute(conn *Conn, param string) {
|
|
ok, err := conn.server.Auth.CheckPasswd(conn.reqUser, param)
|
|
if err != nil {
|
|
conn.writeMessage(550, "Checking password error")
|
|
return
|
|
}
|
|
|
|
if ok {
|
|
conn.user = conn.reqUser
|
|
conn.reqUser = ""
|
|
conn.writeMessage(230, "Password ok, continue")
|
|
} else {
|
|
conn.writeMessage(530, "Incorrect password, not logged in")
|
|
}
|
|
}
|
|
|
|
// commandPasv responds to the PASV FTP command.
|
|
//
|
|
// The client is requesting us to open a new TCP listing socket and wait for them
|
|
// to connect to it.
|
|
type commandPasv struct{}
|
|
|
|
func (cmd commandPasv) IsExtend() bool {
|
|
return false
|
|
}
|
|
|
|
func (cmd commandPasv) RequireParam() bool {
|
|
return false
|
|
}
|
|
|
|
func (cmd commandPasv) RequireAuth() bool {
|
|
return true
|
|
}
|
|
|
|
func (cmd commandPasv) Execute(conn *Conn, param string) {
|
|
listenIP := conn.passiveListenIP()
|
|
socket, err := newPassiveSocket(listenIP, conn.PassivePort, conn.logger, conn.sessionID, conn.tlsConfig)
|
|
if err != nil {
|
|
conn.writeMessage(425, "Data connection failed")
|
|
return
|
|
}
|
|
conn.dataConn = socket
|
|
p1 := socket.Port() / 256
|
|
p2 := socket.Port() - (p1 * 256)
|
|
quads := strings.Split(listenIP, ".")
|
|
target := fmt.Sprintf("(%s,%s,%s,%s,%d,%d)", quads[0], quads[1], quads[2], quads[3], p1, p2)
|
|
msg := "Entering Passive Mode " + target
|
|
conn.writeMessage(227, msg)
|
|
}
|
|
|
|
// commandPort responds to the PORT FTP command.
|
|
//
|
|
// The client has opened a listening socket for sending out of band data and
|
|
// is requesting that we connect to it
|
|
type commandPort struct{}
|
|
|
|
func (cmd commandPort) IsExtend() bool {
|
|
return false
|
|
}
|
|
|
|
func (cmd commandPort) RequireParam() bool {
|
|
return true
|
|
}
|
|
|
|
func (cmd commandPort) RequireAuth() bool {
|
|
return true
|
|
}
|
|
|
|
func (cmd commandPort) Execute(conn *Conn, param string) {
|
|
nums := strings.Split(param, ",")
|
|
portOne, _ := strconv.Atoi(nums[4])
|
|
portTwo, _ := strconv.Atoi(nums[5])
|
|
port := (portOne * 256) + portTwo
|
|
host := nums[0] + "." + nums[1] + "." + nums[2] + "." + nums[3]
|
|
socket, err := newActiveSocket(host, port, conn.logger, conn.sessionID)
|
|
if err != nil {
|
|
conn.writeMessage(425, "Data connection failed")
|
|
return
|
|
}
|
|
conn.dataConn = socket
|
|
conn.writeMessage(200, "Connection established ("+strconv.Itoa(port)+")")
|
|
}
|
|
|
|
// commandPwd responds to the PWD FTP command.
|
|
//
|
|
// Tells the client what the current working directory is.
|
|
type commandPwd struct{}
|
|
|
|
func (cmd commandPwd) IsExtend() bool {
|
|
return false
|
|
}
|
|
|
|
func (cmd commandPwd) RequireParam() bool {
|
|
return false
|
|
}
|
|
|
|
func (cmd commandPwd) RequireAuth() bool {
|
|
return true
|
|
}
|
|
|
|
func (cmd commandPwd) Execute(conn *Conn, param string) {
|
|
conn.writeMessage(257, "\""+conn.namePrefix+"\" is the current directory")
|
|
}
|
|
|
|
// CommandQuit responds to the QUIT FTP command. The client has requested the
|
|
// connection be closed.
|
|
type commandQuit struct{}
|
|
|
|
func (cmd commandQuit) IsExtend() bool {
|
|
return false
|
|
}
|
|
|
|
func (cmd commandQuit) RequireParam() bool {
|
|
return false
|
|
}
|
|
|
|
func (cmd commandQuit) RequireAuth() bool {
|
|
return false
|
|
}
|
|
|
|
func (cmd commandQuit) Execute(conn *Conn, param string) {
|
|
conn.writeMessage(221, "Goodbye")
|
|
conn.Close()
|
|
}
|
|
|
|
// commandRetr responds to the RETR FTP command. It allows the client to
|
|
// download a file.
|
|
type commandRetr struct{}
|
|
|
|
func (cmd commandRetr) IsExtend() bool {
|
|
return false
|
|
}
|
|
|
|
func (cmd commandRetr) RequireParam() bool {
|
|
return true
|
|
}
|
|
|
|
func (cmd commandRetr) RequireAuth() bool {
|
|
return true
|
|
}
|
|
|
|
func (cmd commandRetr) Execute(conn *Conn, param string) {
|
|
path := conn.buildPath(param)
|
|
defer func() {
|
|
conn.lastFilePos = 0
|
|
conn.appendData = false
|
|
}()
|
|
bytes, data, err := conn.driver.GetFile(path, conn.lastFilePos)
|
|
if err == nil {
|
|
defer data.Close()
|
|
conn.writeMessage(150, fmt.Sprintf("Data transfer starting %v bytes", bytes))
|
|
err = conn.sendOutofBandDataWriter(data)
|
|
if err != nil {
|
|
conn.writeMessage(551, "Error reading file")
|
|
}
|
|
} else {
|
|
conn.writeMessage(551, "File not available")
|
|
}
|
|
}
|
|
|
|
type commandRest struct{}
|
|
|
|
func (cmd commandRest) IsExtend() bool {
|
|
return false
|
|
}
|
|
|
|
func (cmd commandRest) RequireParam() bool {
|
|
return true
|
|
}
|
|
|
|
func (cmd commandRest) RequireAuth() bool {
|
|
return true
|
|
}
|
|
|
|
func (cmd commandRest) Execute(conn *Conn, param string) {
|
|
var err error
|
|
conn.lastFilePos, err = strconv.ParseInt(param, 10, 64)
|
|
if err != nil {
|
|
conn.writeMessage(551, "File not available")
|
|
return
|
|
}
|
|
|
|
conn.appendData = true
|
|
|
|
conn.writeMessage(350, fmt.Sprint("Start transfer from ", conn.lastFilePos))
|
|
}
|
|
|
|
// commandRnfr responds to the RNFR FTP command. It's the first of two commands
|
|
// required for a client to rename a file.
|
|
type commandRnfr struct{}
|
|
|
|
func (cmd commandRnfr) IsExtend() bool {
|
|
return false
|
|
}
|
|
|
|
func (cmd commandRnfr) RequireParam() bool {
|
|
return true
|
|
}
|
|
|
|
func (cmd commandRnfr) RequireAuth() bool {
|
|
return true
|
|
}
|
|
|
|
func (cmd commandRnfr) Execute(conn *Conn, param string) {
|
|
conn.renameFrom = conn.buildPath(param)
|
|
conn.writeMessage(350, "Requested file action pending further information.")
|
|
}
|
|
|
|
// cmdRnto responds to the RNTO FTP command. It's the second of two commands
|
|
// required for a client to rename a file.
|
|
type commandRnto struct{}
|
|
|
|
func (cmd commandRnto) IsExtend() bool {
|
|
return false
|
|
}
|
|
|
|
func (cmd commandRnto) RequireParam() bool {
|
|
return true
|
|
}
|
|
|
|
func (cmd commandRnto) RequireAuth() bool {
|
|
return true
|
|
}
|
|
|
|
func (cmd commandRnto) Execute(conn *Conn, param string) {
|
|
toPath := conn.buildPath(param)
|
|
err := conn.driver.Rename(conn.renameFrom, toPath)
|
|
defer func() {
|
|
conn.renameFrom = ""
|
|
}()
|
|
|
|
if err == nil {
|
|
conn.writeMessage(250, "File renamed")
|
|
} else {
|
|
conn.writeMessage(550, fmt.Sprint("Action not taken: ", err))
|
|
}
|
|
}
|
|
|
|
// cmdRmd responds to the RMD FTP command. It allows the client to delete a
|
|
// directory.
|
|
type commandRmd struct{}
|
|
|
|
func (cmd commandRmd) IsExtend() bool {
|
|
return false
|
|
}
|
|
|
|
func (cmd commandRmd) RequireParam() bool {
|
|
return true
|
|
}
|
|
|
|
func (cmd commandRmd) RequireAuth() bool {
|
|
return true
|
|
}
|
|
|
|
func (cmd commandRmd) Execute(conn *Conn, param string) {
|
|
path := conn.buildPath(param)
|
|
err := conn.driver.DeleteDir(path)
|
|
if err == nil {
|
|
conn.writeMessage(250, "Directory deleted")
|
|
} else {
|
|
conn.writeMessage(550, fmt.Sprint("Directory delete failed: ", err))
|
|
}
|
|
}
|
|
|
|
type commandAdat struct{}
|
|
|
|
func (cmd commandAdat) IsExtend() bool {
|
|
return false
|
|
}
|
|
|
|
func (cmd commandAdat) RequireParam() bool {
|
|
return true
|
|
}
|
|
|
|
func (cmd commandAdat) RequireAuth() bool {
|
|
return true
|
|
}
|
|
|
|
func (cmd commandAdat) Execute(conn *Conn, param string) {
|
|
conn.writeMessage(550, "Action not taken")
|
|
}
|
|
|
|
type commandAuth struct{}
|
|
|
|
func (cmd commandAuth) IsExtend() bool {
|
|
return false
|
|
}
|
|
|
|
func (cmd commandAuth) RequireParam() bool {
|
|
return true
|
|
}
|
|
|
|
func (cmd commandAuth) RequireAuth() bool {
|
|
return false
|
|
}
|
|
|
|
func (cmd commandAuth) Execute(conn *Conn, param string) {
|
|
if param == "TLS" && conn.tlsConfig != nil {
|
|
conn.writeMessage(234, "AUTH command OK")
|
|
err := conn.upgradeToTLS()
|
|
if err != nil {
|
|
conn.logger.Printf("Error upgrading connection to TLS %v", err.Error())
|
|
}
|
|
} else {
|
|
conn.writeMessage(550, "Action not taken")
|
|
}
|
|
}
|
|
|
|
type commandCcc struct{}
|
|
|
|
func (cmd commandCcc) IsExtend() bool {
|
|
return false
|
|
}
|
|
|
|
func (cmd commandCcc) RequireParam() bool {
|
|
return true
|
|
}
|
|
|
|
func (cmd commandCcc) RequireAuth() bool {
|
|
return true
|
|
}
|
|
|
|
func (cmd commandCcc) Execute(conn *Conn, param string) {
|
|
conn.writeMessage(550, "Action not taken")
|
|
}
|
|
|
|
type commandEnc struct{}
|
|
|
|
func (cmd commandEnc) IsExtend() bool {
|
|
return false
|
|
}
|
|
|
|
func (cmd commandEnc) RequireParam() bool {
|
|
return true
|
|
}
|
|
|
|
func (cmd commandEnc) RequireAuth() bool {
|
|
return true
|
|
}
|
|
|
|
func (cmd commandEnc) Execute(conn *Conn, param string) {
|
|
conn.writeMessage(550, "Action not taken")
|
|
}
|
|
|
|
type commandMic struct{}
|
|
|
|
func (cmd commandMic) IsExtend() bool {
|
|
return false
|
|
}
|
|
|
|
func (cmd commandMic) RequireParam() bool {
|
|
return true
|
|
}
|
|
|
|
func (cmd commandMic) RequireAuth() bool {
|
|
return true
|
|
}
|
|
|
|
func (cmd commandMic) Execute(conn *Conn, param string) {
|
|
conn.writeMessage(550, "Action not taken")
|
|
}
|
|
|
|
type commandPbsz struct{}
|
|
|
|
func (cmd commandPbsz) IsExtend() bool {
|
|
return false
|
|
}
|
|
|
|
func (cmd commandPbsz) RequireParam() bool {
|
|
return true
|
|
}
|
|
|
|
func (cmd commandPbsz) RequireAuth() bool {
|
|
return false
|
|
}
|
|
|
|
func (cmd commandPbsz) Execute(conn *Conn, param string) {
|
|
if conn.tls && param == "0" {
|
|
conn.writeMessage(200, "OK")
|
|
} else {
|
|
conn.writeMessage(550, "Action not taken")
|
|
}
|
|
}
|
|
|
|
type commandProt struct{}
|
|
|
|
func (cmd commandProt) IsExtend() bool {
|
|
return false
|
|
}
|
|
|
|
func (cmd commandProt) RequireParam() bool {
|
|
return true
|
|
}
|
|
|
|
func (cmd commandProt) RequireAuth() bool {
|
|
return false
|
|
}
|
|
|
|
func (cmd commandProt) Execute(conn *Conn, param string) {
|
|
if conn.tls && param == "P" {
|
|
conn.writeMessage(200, "OK")
|
|
} else if conn.tls {
|
|
conn.writeMessage(536, "Only P level is supported")
|
|
} else {
|
|
conn.writeMessage(550, "Action not taken")
|
|
}
|
|
}
|
|
|
|
type commandConf struct{}
|
|
|
|
func (cmd commandConf) IsExtend() bool {
|
|
return false
|
|
}
|
|
|
|
func (cmd commandConf) RequireParam() bool {
|
|
return true
|
|
}
|
|
|
|
func (cmd commandConf) RequireAuth() bool {
|
|
return true
|
|
}
|
|
|
|
func (cmd commandConf) Execute(conn *Conn, param string) {
|
|
conn.writeMessage(550, "Action not taken")
|
|
}
|
|
|
|
// commandSize responds to the SIZE FTP command. It returns the size of the
|
|
// requested path in bytes.
|
|
type commandSize struct{}
|
|
|
|
func (cmd commandSize) IsExtend() bool {
|
|
return false
|
|
}
|
|
|
|
func (cmd commandSize) RequireParam() bool {
|
|
return true
|
|
}
|
|
|
|
func (cmd commandSize) RequireAuth() bool {
|
|
return true
|
|
}
|
|
|
|
func (cmd commandSize) Execute(conn *Conn, param string) {
|
|
path := conn.buildPath(param)
|
|
stat, err := conn.driver.Stat(path)
|
|
if err != nil {
|
|
log.Printf("Size: error(%s)", err)
|
|
conn.writeMessage(450, fmt.Sprint("path", path, "not found"))
|
|
} else {
|
|
conn.writeMessage(213, strconv.Itoa(int(stat.Size())))
|
|
}
|
|
}
|
|
|
|
// commandStor responds to the STOR FTP command. It allows the user to upload a
|
|
// new file.
|
|
type commandStor struct{}
|
|
|
|
func (cmd commandStor) IsExtend() bool {
|
|
return false
|
|
}
|
|
|
|
func (cmd commandStor) RequireParam() bool {
|
|
return true
|
|
}
|
|
|
|
func (cmd commandStor) RequireAuth() bool {
|
|
return true
|
|
}
|
|
|
|
func (cmd commandStor) Execute(conn *Conn, param string) {
|
|
targetPath := conn.buildPath(param)
|
|
conn.writeMessage(150, "Data transfer starting")
|
|
|
|
defer func() {
|
|
conn.appendData = false
|
|
}()
|
|
|
|
bytes, err := conn.driver.PutFile(targetPath, conn.dataConn, conn.appendData)
|
|
if err == nil {
|
|
msg := "OK, received " + strconv.Itoa(int(bytes)) + " bytes"
|
|
conn.writeMessage(226, msg)
|
|
} else {
|
|
conn.writeMessage(450, fmt.Sprint("error during transfer: ", err))
|
|
}
|
|
}
|
|
|
|
// commandStru responds to the STRU FTP command.
|
|
//
|
|
// like the MODE and TYPE commands, stru[cture] dates back to a time when the
|
|
// FTP protocol was more aware of the content of the files it was transferring,
|
|
// and would sometimes be expected to translate things like EOL markers on the
|
|
// fly.
|
|
//
|
|
// These days files are sent unmodified, and F(ile) mode is the only one we
|
|
// really need to support.
|
|
type commandStru struct{}
|
|
|
|
func (cmd commandStru) IsExtend() bool {
|
|
return false
|
|
}
|
|
|
|
func (cmd commandStru) RequireParam() bool {
|
|
return true
|
|
}
|
|
|
|
func (cmd commandStru) RequireAuth() bool {
|
|
return true
|
|
}
|
|
|
|
func (cmd commandStru) Execute(conn *Conn, param string) {
|
|
if strings.ToUpper(param) == "F" {
|
|
conn.writeMessage(200, "OK")
|
|
} else {
|
|
conn.writeMessage(504, "STRU is an obsolete command")
|
|
}
|
|
}
|
|
|
|
// commandSyst responds to the SYST FTP command by providing a canned response.
|
|
type commandSyst struct{}
|
|
|
|
func (cmd commandSyst) IsExtend() bool {
|
|
return false
|
|
}
|
|
|
|
func (cmd commandSyst) RequireParam() bool {
|
|
return false
|
|
}
|
|
|
|
func (cmd commandSyst) RequireAuth() bool {
|
|
return true
|
|
}
|
|
|
|
func (cmd commandSyst) Execute(conn *Conn, param string) {
|
|
conn.writeMessage(215, "UNIX Type: L8")
|
|
}
|
|
|
|
// commandType responds to the TYPE FTP command.
|
|
//
|
|
// like the MODE and STRU commands, TYPE dates back to a time when the FTP
|
|
// protocol was more aware of the content of the files it was transferring, and
|
|
// would sometimes be expected to translate things like EOL markers on the fly.
|
|
//
|
|
// Valid options were A(SCII), I(mage), E(BCDIC) or LN (for local type). Since
|
|
// we plan to just accept bytes from the client unchanged, I think Image mode is
|
|
// adequate. The RFC requires we accept ASCII mode however, so accept it, but
|
|
// ignore it.
|
|
type commandType struct{}
|
|
|
|
func (cmd commandType) IsExtend() bool {
|
|
return false
|
|
}
|
|
|
|
func (cmd commandType) RequireParam() bool {
|
|
return false
|
|
}
|
|
|
|
func (cmd commandType) RequireAuth() bool {
|
|
return true
|
|
}
|
|
|
|
func (cmd commandType) Execute(conn *Conn, param string) {
|
|
if strings.ToUpper(param) == "A" {
|
|
conn.writeMessage(200, "Type set to ASCII")
|
|
} else if strings.ToUpper(param) == "I" {
|
|
conn.writeMessage(200, "Type set to binary")
|
|
} else {
|
|
conn.writeMessage(500, "Invalid type")
|
|
}
|
|
}
|
|
|
|
// commandUser responds to the USER FTP command by asking for the password
|
|
type commandUser struct{}
|
|
|
|
func (cmd commandUser) IsExtend() bool {
|
|
return false
|
|
}
|
|
|
|
func (cmd commandUser) RequireParam() bool {
|
|
return true
|
|
}
|
|
|
|
func (cmd commandUser) RequireAuth() bool {
|
|
return false
|
|
}
|
|
|
|
func (cmd commandUser) Execute(conn *Conn, param string) {
|
|
conn.reqUser = param
|
|
if conn.tls || conn.tlsConfig == nil {
|
|
conn.writeMessage(331, "User name ok, password required")
|
|
} else {
|
|
conn.writeMessage(534, "Unsecured login not allowed. AUTH TLS required")
|
|
}
|
|
}
|