Nmap

by hahwul 2 min read

Introduction

Nmap은 오픈소스 기반의 Network discovery 도구입니다. 일반적으로 포트스캐너로 알려져 있으며, Lua script(NSE)를 통해 별도의 테스팅 로직을 구성할 수 있어 웹부터 네트워크단 취약점에 대한 스캐닝까지 충분히 커버할 수 있습니다.

Installation

Mac

brew install nmap

Linux

apt install nmap

Windows

https://nmap.org/download.html

Go-to commands

nmap -sC 192.168.0.1   (same this, nmap 192.168.0.1 --script=default)
- 디폴트 스크립트로 대상 스캔
- scanning with default scripts

nmap -sn -sC 192.168.0.1
- 포트스캔 없이 스크립트 스캔만
- scanning default script without portscan

nmap -PN 192.168.0.1
- Host 스캔 없이 바로 포트 스캐닝
- Portscanning without host scan

nmap -PN 192.168.0.1 -p-
- Full port(1-65536) scanning

nmap -sS 192.168.0.1
- Syn 스캔
- Syn portscan

nmap -sS 192.168.0.1 --script=http* -oX test.xml
- Syn scanning with enable "http~~" scripts and xml output file

Default Commands

Scan single IP/Port

nmap 192.168.0.1

nmap www.hahwul.com

nmap 192.168.0.1 -p 443

Scan range of IP/Ports

IP range and subnet

nmap 192.168.0.1-254

nmap 192.168.0.0/24

Port range

nmap 192.168.0.1 -p 20-3000

Full port scanning

nmap 192.168.0.1 -p-

Most 100 port

nmap 192.168.0.1 -F

Scan from file

nmap -iL hosts.txt

Scan types

TCP

nmap -sT 192.168.0.1

Syn

nmap -sS 192.168.0.1

UDP

nmap -sU 192.168.0.1

PING(Ping sweep)

nmap -sP 192.168.0.1

Use NSE(Lua)

Usage

Same lines.
--script <NSE FILE>
--script=<NSE FILE>

Use NSE

nmap 192.168.0.1 --script <NSE FILE>

Use NSE with arguments

nmap 192.168.0.1 --script nse --script-args <ARGUMENTS>

Use NSE with arguments file

nmap 192.168.0.1 --script nse --script-args-file <FILE>

Use NSE arguments scripts

nmap -sC --script-args 'user=foo,pass=",{}=bar",paths={/admin,/cgi-bin},xmpp-info.server_name=localhost’

nmap.registry.args = {
  user = "foo",
  pass = ",{}=bar",
  paths = {
    "/admin",
    "/cgi-bin"
  },
  xmpp-info.server_name="localhost"
}

NSE list

Write NSE scripts

NSE Information

description = [[
Attempts to find the owner of an open TCP port by querying an auth
(identd - port 113) daemon which must also be open on the target system.
]]

author = "Diman Todorov"
license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
categories = {"default", "safe"}

portrule

portrule = function(host, port)
    local auth_port = { number=113, protocol="tcp" }
    local identd = nmap.get_port_state(host, auth_port)

    return identd ~= nil
        and identd.state == "open"
        and port.protocol == "tcp"
        and port.state == "open"
end

action

action = function(host, port)
        local owner = ""
        local client_ident = nmap.new_socket()
        local client_service = nmap.new_socket()
        local catch = function()
                client_ident:close()
                client_service:close()
        end
        local try = nmap.new_try(catch)
        try(client_ident:connect(host.ip, 113))
        try(client_service:connect(host.ip, port.number))
        local localip, localport, remoteip, remoteport =
                try(client_service:get_info())

        local request = port.number .. ", " .. localport .. "\r\n"
        try(client_ident:send(request))
        owner = try(client_ident:receive_lines(1))
        if string.match(owner, "ERROR") then
                owner = nil
        else
                owner = string.match(owner,
                        "%d+%s*,%s*%d+%s*:%s*USERID%s*:%s*.+%s*:%s*(.+)\r?\n")
        end
        try(client_ident:close())
        try(client_service:close())
        return owner
end

Articles

References