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Diffstat (limited to 'scripts/snmp-netstat.nse')
| -rw-r--r-- | scripts/snmp-netstat.nse | 138 |
1 files changed, 138 insertions, 0 deletions
diff --git a/scripts/snmp-netstat.nse b/scripts/snmp-netstat.nse new file mode 100644 index 0000000..97f503a --- /dev/null +++ b/scripts/snmp-netstat.nse @@ -0,0 +1,138 @@ +local nmap = require "nmap" +local shortport = require "shortport" +local snmp = require "snmp" +local stdnse = require "stdnse" +local string = require "string" +local table = require "table" +local target = require "target" + +description = [[ +Attempts to query SNMP for a netstat like output. The script can be used to +identify and automatically add new targets to the scan by supplying the +newtargets script argument. +]] + +--- +-- @usage +-- nmap -sU -p 161 --script=snmp-netstat <target> +-- @output +-- | snmp-netstat: +-- | TCP 0.0.0.0:21 0.0.0.0:2256 +-- | TCP 0.0.0.0:80 0.0.0.0:8218 +-- | TCP 0.0.0.0:135 0.0.0.0:53285 +-- | TCP 0.0.0.0:389 0.0.0.0:38990 +-- | TCP 0.0.0.0:445 0.0.0.0:49158 +-- | TCP 127.0.0.1:389 127.0.0.1:1045 +-- | TCP 127.0.0.1:389 127.0.0.1:1048 +-- | UDP 192.168.56.3:137 *:* +-- | UDP 192.168.56.3:138 *:* +-- | UDP 192.168.56.3:389 *:* +-- |_ UDP 192.168.56.3:464 *:* + +author = "Patrik Karlsson" +license = "Same as Nmap--See https://nmap.org/book/man-legal.html" +categories = {"default", "discovery", "safe"} +dependencies = {"snmp-brute"} + +-- Version 0.3 +-- Created 01/19/2010 - v0.1 - created by Patrik Karlsson <patrik@cqure.net> +-- Revised 04/11/2010 - v0.2 - moved snmp_walk to snmp library <patrik@cqure.net> +-- Revised 07/26/2012 - v0.3 - added newtargets support + + +portrule = shortport.port_or_service(161, "snmp", "udp", {"open", "open|filtered"}) + +--- Processes the table and creates the script output +-- +-- @param tbl table containing <code>oid</code> and <code>value</code> +-- @param base_oid string containing the value of the base_oid of the walk +-- @return table +local function process_answer( tbl, base_oid ) + local result = {} + for _, v in ipairs( tbl ) do + local lip = v.oid:match( "^" .. base_oid .. "%.(%d+%.%d+%.%d+%.%d+)") or "" + local lport = v.oid:match( "^" .. base_oid .. "%.%d+%.%d+%.%d+%.%d+%.(%d+)") + local fip = v.oid:match( "^" .. base_oid .. "%.%d+%.%d+%.%d+%.%d+%.%d+%.(%d+%.%d+%.%d+%.%d+)") or "*:*" + local fport = v.oid:match( "^" .. base_oid .. "%.%d+%.%d+%.%d+%.%d+%.%d+%.%d+%.%d+%.%d+%.%d+%.(%d+)") + local left = (lport and (lip .. ":" .. lport) or lip) + local right= (fport and (fip .. ":" .. fport) or fip) + if ( right or left ) then + table.insert(result, { left = left, right = right }) + end + end + return result +end + +local function format_output(tbl, prefix) + local result = {} + for _, v in ipairs(tbl) do + local value = string.format("%-20s %s", v.left, v.right ) + table.insert( result, string.format( "%-4s %s", prefix, value ) ) + end + return result +end + +local function table_merge( t1, t2 ) + for _, v in ipairs(t2) do + table.insert(t1, v) + end + return t1 +end + +local function add_targets(tbl) + if ( not(target.ALLOW_NEW_TARGETS) ) then + return + end + + -- get a list of local IPs + local local_ips = {} + for _, v in ipairs(tbl) do + local ip = ((v.left and v.left:match("^(.-):")) and v.left:match("^(.-):") or v.left) + local_ips[ip] = true + end + + -- identify remote IPs + local remote_ips = {} + for _, v in ipairs(tbl) do + local ip = ((v.right and v.right:match("^(.-):")) and v.right:match("^(.-):") or v.right) + if ( not(remote_ips[ip]) and not(local_ips[ip]) and ip ~= "*" ) then + target.add(ip) + end + end +end + +action = function(host, port) + + local tcp_oid = "1.3.6.1.2.1.6.13.1.1" + local udp_oid = "1.3.6.1.2.1.7.5.1.1" + local netstat = {} + local status, tcp, udp + + local snmpHelper = snmp.Helper:new(host, port) + snmpHelper:connect() + + status, tcp = snmpHelper:walk( tcp_oid ) + if ( not(status) ) then return end + + status, udp = snmpHelper:walk( udp_oid ) + if ( not(status) ) then return end + + if ( tcp == nil ) or ( #tcp == 0 ) or ( udp==nil ) or ( #udp == 0 ) then + return + end + + tcp = process_answer(tcp, tcp_oid) + add_targets(tcp) + tcp = format_output(tcp, "TCP") + + udp = process_answer(udp, udp_oid) + add_targets(udp) + udp = format_output(udp, "UDP") + + netstat = table_merge( tcp, udp ) + + nmap.set_port_state(host, port, "open") + + return stdnse.format_output( true, netstat ) +end + |