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+local nmap = require "nmap"
+local shortport = require "shortport"
+local snmp = require "snmp"
+local stdnse = require "stdnse"
+
+description = [[
+Attempts to enumerate Huawei / HP/H3C Locally Defined Users through the
+hh3c-user.mib OID
+
+For devices running software released pre-Oct 2012 only an SNMP read-only
+string is required to access the OID. Otherwise a read-write string is
+required.
+
+Output is 'username - password - level: {0|1|2|3}'
+
+Password may be in cleartext, ciphertext or sha256
+Levels are from 0 to 3 with 0 being the lowest security level
+
+https://h20566.www2.hp.com/portal/site/hpsc/public/kb/docDisplay/?docId=emr_na-c03515685
+http://grutztopia.jingojango.net/2012/10/hph3c-and-huawei-snmp-weak-access-to.html
+]]
+
+---
+-- @usage
+-- nmap -sU -p 161 --script snmp-hh3c-logins --script-args creds.snmp=:<community> <target>
+--
+-- @output
+-- | snmp-hh3c-logins:
+-- | users:
+-- | admin - admin - level: 3
+-- |_ h3c - h3capadmin - level 0
+--
+-- @xmloutput
+-- <table>
+-- <elem key="password">admin<elem>
+-- <elem key="username">admin</elem>
+-- <elem key="level">3</elem>
+-- </table>
+-- <table>
+-- <elem key="password">h3capadmin<elem>
+-- <elem key="username">h3c</elem>
+-- <elem key="level">0</elem>
+-- </table>
+
+author = "Kurt Grutzmacher"
+license = "Same as Nmap--See https://nmap.org/book/man-legal.html"
+categories = {"default", "discovery", "safe"}
+dependencies = {"snmp-brute"}
+
+-- Version 0.3
+-- Created 10/01/2012 - v0.1 - created via modifying other walk scripts
+-- Updated 10/25/2012 - v0.2 - bugfixes and better output per NSE standards
+-- Updated 11/08/2012 - v0.3 - added xmloutput
+
+
+portrule = shortport.port_or_service(161, "snmp", "udp", {"open", "open|filtered"})
+
+--- Gets a value for the specified oid
+--
+-- @param tbl table containing <code>oid</code> and <code>value</code>
+-- @param oid string containing the object id for which the value should be extracted
+-- @return value of relevant type or nil if oid was not found
+function get_value_from_table( tbl, oid )
+
+ for _, v in ipairs( tbl ) do
+ if v.oid == oid then
+ return v.value
+ end
+ end
+
+ return nil
+end
+
+--- Processes the table and creates the script output
+--
+-- @param tbl table containing <code>oid</code> and <code>value</code>
+-- @return <code>stdnse.output_table</code> formatted table
+function process_answer( tbl )
+
+ -- h3c-user MIB OIDs (oldoid)
+ local h3cUserName = "1.3.6.1.4.1.2011.10.2.12.1.1.1.1"
+ local h3cUserPassword = "1.3.6.1.4.1.2011.10.2.12.1.1.1.2"
+ local h3cUserLevel = "1.3.6.1.4.1.2011.10.2.12.1.1.1.4"
+ local h3cUserState = "1.3.6.1.4.1.2011.10.2.12.1.1.1.5"
+
+ -- hh3c-user MIB OIDs (newoid)
+ local hh3cUserName = "1.3.6.1.4.1.25506.2.12.1.1.1.1"
+ local hh3cUserPassword = "1.3.6.1.4.1.25506.2.12.1.1.1.2"
+ local hh3cUserLevel = "1.3.6.1.4.1.25506.2.12.1.1.1.4"
+ local hh3cUserState = "1.3.6.1.4.1.25506.2.12.1.1.1.5"
+
+ local output = stdnse.output_table()
+ output.users = {}
+
+ for _, v in ipairs( tbl ) do
+
+ if ( v.oid:match("^" .. h3cUserName) ) then
+ local item = {}
+ local oldobjid = v.oid:gsub( "^" .. h3cUserName, h3cUserPassword)
+ local password = get_value_from_table( tbl, oldobjid )
+
+ if ( password == nil ) or ( #password == 0 ) then
+ local newobjid = v.oid:gsub( "^" .. hh3cUserName, hh3cUserPassword)
+ password = get_value_from_table( tbl, newobjid )
+ end
+
+ oldobjid = v.oid:gsub( "^" .. h3cUserName, h3cUserLevel)
+ local level = get_value_from_table( tbl, oldobjid )
+
+ if ( level == nil ) then
+ local newobjoid = v.oid:gsub( "^" .. hh3cUserName, hh3cUserLevel)
+ level = get_value_from_table( tbl, oldobjid )
+ end
+
+ output.users[#output.users + 1] = {username=v.value, password=password, level=level}
+ end
+
+ end
+
+ return output
+end
+
+action = function(host, port)
+
+ local oldsnmpoid = "1.3.6.1.4.1.2011.10.2.12.1.1.1"
+ local newsnmpoid = "1.3.6.1.4.1.25506.2.12.1.1.1"
+
+ local snmpHelper = snmp.Helper:new(host, port)
+ snmpHelper:connect()
+
+ local status, users = snmpHelper:walk( oldsnmpoid )
+
+ if (not(status)) or ( users == nil ) or ( #users == 0 ) then
+
+ -- no status? try new snmp oid
+ status, users = snmpHelper:walk( newsnmpoid )
+
+ if (not(status)) or ( users == nil ) or ( #users == 0 ) then
+ return nil
+ end
+
+ end
+
+ nmap.set_port_state(host, port, "open")
+ return process_answer(users)
+
+end
+