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8bd71aaf43
I made every script follow a standard form: it starts with the id, followed by the description. The description is contained in [[ ]] delimiters. The description is in the global description variable, not in a LuaDoc comment. Other LuaDoc information such as @args and @usage follows the description in a comment. The first paragraph of each description is a a short summary of what the script does. More detailed information, if any, is given in following paragraphs. I also improved some wording and formatting in a few cases.
106 lines
2.2 KiB
Lua
106 lines
2.2 KiB
Lua
id = "SNMPv1-communitybrute"
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description = [[
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Attempts to find an SNMP community string by brute force.
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]]
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-- 2008-07-03
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author = "Philip Pickering <pgpickering@gmail.com>"
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license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
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categories = {"intrusive", "auth"}
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require "shortport"
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require "snmp"
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-- runs before SNMPsysdesr.nse
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runlevel = 1
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portrule = shortport.portnumber(161, "udp", {"open", "open|filtered"})
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action = function(host, port)
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if nmap.registry.snmpcommunity or nmap.registry.args.snmpcommunity then return end
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-- create the socket used for our connection
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local socket = nmap.new_socket()
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-- set a reasonable timeout value
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socket:set_timeout(5000)
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-- do some exception handling / cleanup
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local catch = function()
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socket:close()
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end
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local try = nmap.new_try(catch)
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-- connect to the potential SNMP system
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try(socket:connect(host.ip, port.number, "udp"))
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local request = snmp.buildGetRequest({}, "1.3.6.1.2.1.1.3.0")
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local commFile = nmap.fetchfile(nmap.registry.args.snmplist)
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local commTable
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-- fetch wordlist from file (from unpwdb-lib)
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if commFile then
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local file = io.open(commFile)
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if file then
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commTable = {}
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while true do
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local l = file:read()
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if not l then
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break
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end
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-- Comments takes up a whole line
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if not l:match("#!comment:") then
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table.insert(commTable, l)
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end
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end
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file:close()
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end
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end
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-- default wordlist
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if (not commTable) then commTable = {'public', 'private', 'snmpd', 'snmp', 'mngt', 'cisco', 'admin'} end
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-- send all possible words out before waiting for an answer
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for _, commStr in ipairs(commTable) do
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local payload = snmp.encode(snmp.buildPacket(request, 0, commStr))
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try(socket:send(payload))
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end
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-- finally wait for a response
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local status
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local response
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status, response = socket:receive_bytes(1)
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if (not status) then
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return
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end
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if (response == "TIMEOUT") then
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return
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end
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nmap.set_port_state(host, port, "open")
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local result
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_, result = snmp.decode(response)
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-- response contains valid community string
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if type(result) == "table" then
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nmap.registry.snmpcommunity = result[2]
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return result[2]
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end
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return
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end
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