---
-- Functions for building short portrules.
--
-- Since portrules are mostly the same for many scripts, this
-- module provides functions for the most common tests.
--
-- @copyright Same as Nmap--See http://nmap.org/book/man-legal.html
module(... or "shortport", package.seeall)
local nmap = require "nmap"
---
-- See if a table contains a value.
-- @param t A table repesenting a set.
-- @param value The value to check for.
-- @return True if <code>t</code> contains <code>value</code>, false otherwise.
local function includes(t, value)
for _, elem in ipairs(t) do
if elem == value then
return true
end
end
return false
end
--- Check if the port and it's protocol are in the exclude directive.
--
-- @param port A port number.
-- @param proto The protocol to match against, default <code>"tcp"</code>.
-- @return True if the <code>port</code> and <code>protocol</code> are
-- in the exclude directive.
port_is_excluded = function(port, proto)
proto = proto or "tcp"
return nmap.port_is_excluded(port, proto)
end
--- Return a portrule that returns true when given an open port matching a
-- single port number or a list of port numbers.
-- @param ports A single port number or a list of port numbers.
-- @param protos The protocol or list of protocols to match against, default
-- <code>"tcp"</code>.
-- @param states A state or list of states to match against, default
-- {<code>"open"</code>, <code>"open|filtered"</code>}.
-- @return Function for the portrule.
-- @usage portrule = shortport.portnumber({80, 443})
portnumber = function(ports, protos, states)
protos = protos or "tcp"
states = states or {"open", "open|filtered"}
if type(ports) ~= "table" then
ports = {ports}
end
if type(protos) ~= "table" then
protos = {protos}
end
if type(states) ~= "table" then
states = {states}
end
return function(host, port)
return includes(ports, port.number)
and includes(protos, port.protocol)
and includes(states, port.state)
end
end
--- Return a portrule that returns true when given an open port with a
-- service name matching a single service name or a list of service
-- names.
--
-- A service name is something like <code>"http"</code>, <code>"https"</code>,
-- <code>"smtp"</code>, or <code>"ftp"</code>. These service names are
-- determined by Nmap's version scan or (if no version scan information is
-- available) the service assigned to the port in <code>nmap-services</code>
-- (e.g. <code>"http"</code> for TCP port 80).
-- @param services Service name or a list of names to run against.
-- @param protos The protocol or list of protocols to match against, default
-- <code>"tcp"</code>.
-- @param states A state or list of states to match against, default
-- {<code>"open"</code>, <code>"open|filtered"</code>}.
-- @return Function for the portrule.
-- @usage portrule = shortport.service("ftp")
service = function(services, protos, states)
protos = protos or "tcp"
states = states or {"open", "open|filtered"}
if type(services) ~= "table" then
services = {services}
end
if type(protos) ~= "table" then
protos = {protos}
end
if type(states) ~= "table" then
states = {states}
end
return function(host, port)
return includes(services, port.service)
and includes(protos, port.protocol)
and includes(states, port.state)
end
end
--- Return a portrule that returns true when given an open port matching
-- either a port number or service name.
--
-- This function is a combination of the <code>portnumber</code> and
-- <code>service</code> functions. The port and service may be single values or
-- a list of values as in those functions. This function exists because many
-- scripts explicitly try to run against the well-known ports, but want also to
-- run against any other port which was discovered to run the named service.
-- @usage portrule = shortport.port_or_service(22,"ssh").
-- @param ports A single port number or a list of port numbers.
-- @param services Service name or a list of names to run against.
-- @param protos The protocol or list of protocols to match against, default
-- <code>"tcp"</code>.
-- @param states A state or list of states to match against, default
-- {<code>"open"</code>, <code>"open|filtered"</code>}.
-- @return Function for the portrule.
port_or_service = function(ports, services, protos, states)
return function(host, port)
local port_checker = portnumber(ports, protos, states)
local service_checker = service(services, protos, states)
return port_checker(host, port) or service_checker(host, port)
end
end
--- Return a portrule that returns true when given an open port matching
-- either a port number or service name and has not been listed in the
-- exclude port directive of the nmap-service-probes file.
--
-- This function is a combination of the <code>port_is_excluded</code>
-- and <code>port_or_service</code> functions. The port, service, proto may
-- be single values or a list of values as in those functions.
-- This function can be used by version category scripts to check if a
-- given port and it's protocol are in the exclude directive.
-- @usage portrule = shortport.version_port_or_service(22)
-- @usage portrule = shortport.version_port_or_service(nil, "ssh", "tcp")
-- @param services Service name or a list of names to run against.
-- @param protos The protocol or list of protocols to match against, default
-- <code>"tcp"</code>.
-- @param states A state or list of states to match against, default
-- {<code>"open"</code>, <code>"open|filtered"</code>}.
-- @return Function for the portrule.
version_port_or_service = function(ports, services, protos, states)
return function(host, port)
local p_s_check = port_or_service(ports, services, protos, states)
return p_s_check(host, port)
and not(port_is_excluded(port.number, port.protocol))
end
end
---
-- A portrule that matches likely HTTP services.
--
-- @name http
-- @class function
-- @param host The host table to match against.
-- @param port The port table to match against.
-- @return <code>true</code> if the port is likely to be HTTP,
-- <code>false</code> otherwise.
-- @usage
-- portrule = shortport.http
http = shortport.port_or_service({80, 443, 631, 8080, 5800, 3872},
{"http", "https", "ipp", "http-alt", "vnc-http", "oem-agent"})
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