138 lines
2.8 KiB
Go
138 lines
2.8 KiB
Go
package ftp
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import (
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"git.loafle.net/commons_go/logging"
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cnsm "git.loafle.net/commons_go/network_service_matcher"
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)
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// FTP Status codes, defined in RFC 959
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const (
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statusReadyServer = "120"
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statusOK = "200"
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statusNewConnectOK = "220"
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statusSystemNameOK = "215"
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statusCloseConnect = "221"
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statusUnkownCMD = "202"
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statusTlsUseOK = "234"
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statusCloseControlConnect = "421"
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statusSyntaxErr = "500"
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statusParamSyntaxErr = "501"
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statusNotUseCMD = "502"
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statusIncorrectCMD = "503"
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statusTlsNotUse = "534"
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statusNeedUserId = "332"
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)
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type FTPMatcher struct {
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cnsm.Matchers
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isFtps bool
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}
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func (ftp *FTPMatcher) ServiceName() string {
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return "FTP"
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}
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func (ftp *FTPMatcher) String() string {
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re := ""
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if ftp.isFtps {
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re = "FTPS"
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} else {
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re = "FTP"
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}
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return re
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}
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func (ftp *FTPMatcher) IsPrePacket() bool {
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return true
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}
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func (ftp *FTPMatcher) HasResponse(index int) bool {
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return true
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}
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func (ftp *FTPMatcher) IsError(info cnsm.MatchInfo, index int, packet *cnsm.Packet) bool {
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return false
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}
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func (ftp *FTPMatcher) Match(info cnsm.MatchInfo, index int, packet *cnsm.Packet) bool {
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result := false
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if packet == nil || packet.Buffer == nil || packet.Len == 0 {
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logging.Logger().Errorf("Discovery: FTP Matcher Packet nil")
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return result
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}
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str := string(packet.Buffer)
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//fmt.Println(str)
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code := str[:3]
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if index == 0 {
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switch code {
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case statusNewConnectOK, statusReadyServer:
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//fmt.Println(code)
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result = true
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break
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}
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} else if index == 1 {
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switch code {
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case statusSystemNameOK, statusSyntaxErr, statusParamSyntaxErr, statusNotUseCMD:
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//fmt.Println(code)
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result = true
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break
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}
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} else if index == 2 {
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switch code {
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case statusIncorrectCMD, statusParamSyntaxErr, statusNotUseCMD, statusNeedUserId:
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//fmt.Println(code)
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result = true
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break
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}
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} else if index == 3 {
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switch code {
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case statusCloseConnect, statusSyntaxErr:
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//fmt.Println(code)
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result = true
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break
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}
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}
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if index == 3 && result == true {
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var err error
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var isfs bool
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//fmt.Println(info.Port.Host.Ip, info.Port.Port)
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isfs, err = StartCheckFTPS(info)
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if isfs && err == nil {
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ftp.isFtps = isfs
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} else if err != nil {
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logging.Logger().Warnf("Discovery: FTP Matcher Check Error %v", err)
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}
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}
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return result
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}
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func NewMatcher() cnsm.Matcher {
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m := &FTPMatcher{}
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sysStr := "SYST\r\n"
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systByte := make([]byte, len(sysStr))
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copy(systByte[:], sysStr)
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m.AddPacket(cnsm.NewPacket(systByte, len(sysStr)))
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passStr := "PASS \r\n"
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passByte := make([]byte, len(passStr))
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copy(passByte[:], passStr)
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m.AddPacket(cnsm.NewPacket(passByte, len(passStr)))
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quitStr := "QUIT\r\n"
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quitByte := make([]byte, len(quitStr))
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copy(quitByte[:], quitStr)
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m.AddPacket(cnsm.NewPacket(quitByte, len(quitStr)))
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return m
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}
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