| Current Path : /usr/share/nmap/scripts/ |
| Current File : //usr/share/nmap/scripts/ldap-search.nse |
description = [[
Attempts to perform an LDAP search and returns all matches.
If no username and password is supplied to the script the Nmap registry
is consulted. If the <code>ldap-brute</code> script has been selected
and it found a valid account, this account will be used. If not
anonymous bind will be used as a last attempt.
]]
---
-- @args ldap.username If set, the script will attempt to perform an LDAP bind using the username and password
-- @args ldap.password If set, used together with the username to authenticate to the LDAP server
-- @args ldap.qfilter If set, specifies a quick filter. The library does not support parsing real LDAP filters.
-- The following values are valid for the filter parameter: computer, users or all. If no value is specified it defaults to all.
-- @args ldap.base If set, the script will use it as a base for the search. By default the defaultNamingContext is retrieved and used.
-- If no defaultNamingContext is available the script iterates over the available namingContexts
-- @args ldap.attrib If set, the search will include only the attributes specified. For a single attribute a string value can be used, if
-- multiple attributes need to be supplied a table should be used instead.
-- @args ldap.maxobjects If set, overrides the number of objects returned by the script (default 20).
-- The value -1 removes the limit completely.
-- @usage
-- nmap -p 389 --script ldap-search --script-args ldap.username="'cn=ldaptest,cn=users,dc=cqure,dc=net'",ldap.password=ldaptest,
-- ldap.qfilter=users,ldap.attrib=sAMAccountName <host>
--
-- @output
-- PORT STATE SERVICE REASON
-- 389/tcp open ldap syn-ack
-- | ldap-search:
-- | DC=cqure,DC=net
-- | dn: CN=Administrator,CN=Users,DC=cqure,DC=net
-- | sAMAccountName: Administrator
-- | dn: CN=Guest,CN=Users,DC=cqure,DC=net
-- | sAMAccountName: Guest
-- | dn: CN=SUPPORT_388945a0,CN=Users,DC=cqure,DC=net
-- | sAMAccountName: SUPPORT_388945a0
-- | dn: CN=EDUSRV011,OU=Domain Controllers,DC=cqure,DC=net
-- | sAMAccountName: EDUSRV011$
-- | dn: CN=krbtgt,CN=Users,DC=cqure,DC=net
-- | sAMAccountName: krbtgt
-- | dn: CN=Patrik Karlsson,CN=Users,DC=cqure,DC=net
-- | sAMAccountName: patrik
-- | dn: CN=VMABUSEXP008,CN=Computers,DC=cqure,DC=net
-- | sAMAccountName: VMABUSEXP008$
-- | dn: CN=ldaptest,CN=Users,DC=cqure,DC=net
-- |_ sAMAccountName: ldaptest
-- Credit
-- ------
-- o Martin Swende who provided me with the initial code that got me started writing this.
-- Version 0.5
-- Created 01/12/2010 - v0.1 - created by Patrik Karlsson <patrik@cqure.net>
-- Revised 01/20/2010 - v0.2 - added SSL support
-- Revised 01/26/2010 - v0.3 - Changed SSL support to comm.tryssl, prefixed arguments with ldap, changes in determination of namingContexts
-- Revised 02/17/2010 - v0.4 - Added dependencie to ldap-brute and the abilitity to check for ldap accounts (credentials) stored in nmap registry
-- Capped output to 20 entries, use ldap.maxObjects to override
-- Revised 07/16/2010 - v0.5 - Fixed bug with empty contexts, added objectClass person to qfilter users, add error msg for invalid credentials
author = "Patrik Karlsson"
license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
categories = {"discovery", "safe"}
require "ldap"
require 'shortport'
require 'comm'
dependencies = {"ldap-brute"}
portrule = shortport.port_or_service({389,636}, {"ldap","ldapssl"})
function action(host,port)
local status
local socket, opt
local args = nmap.registry.args
local username = args['ldap.username']
local password = args['ldap.password']
local qfilter = args['ldap.qfilter']
local base = args['ldap.base']
local attribs = args['ldap.attrib']
local accounts
local objCount = 0
local maxObjects = nmap.registry.args['ldap.maxobjects'] and tonumber(nmap.registry.args['ldap.maxobjects']) or 20
-- In order to discover what protocol to use (SSL/TCP) we need to send a few bytes to the server
-- An anonymous bind should do it
local ldap_anonymous_bind = string.char( 0x30, 0x0c, 0x02, 0x01, 0x01, 0x60, 0x07, 0x02, 0x01, 0x03, 0x04, 0x00, 0x80, 0x00 )
socket, _, opt = comm.tryssl( host, port, ldap_anonymous_bind, nil )
if not socket then
return
end
-- Check if ldap-brute stored us some credentials
if ( not(username) and nmap.registry.ldapaccounts~=nil ) then
accounts = nmap.registry.ldapaccounts
end
-- We close and re-open the socket so that the anonymous bind does not distract us
socket:close()
status = socket:connect(host, port, opt)
socket:set_timeout(10000)
local req
local searchResEntries
local contexts = {}
local result = {}
local filter
if base == nil then
req = { baseObject = "", scope = ldap.SCOPE.base, derefPolicy = ldap.DEREFPOLICY.default, attributes = { "defaultNamingContext", "namingContexts" } }
status, searchResEntries = ldap.searchRequest( socket, req )
if not status then
socket:close()
return
end
contexts = ldap.extractAttribute( searchResEntries, "defaultNamingContext" )
-- OpenLDAP does not have a defaultNamingContext
if not contexts then
contexts = ldap.extractAttribute( searchResEntries, "namingContexts" )
end
else
table.insert(contexts, base)
end
if ( not(contexts) or #contexts == 0 ) then
stdnse.print_debug( "Failed to retrieve namingContexts" )
contexts = {""}
end
-- perform a bind only if we have valid credentials
if ( username ) then
local bindParam = { version=3, ['username']=username, ['password']=password}
local status, errmsg = ldap.bindRequest( socket, bindParam )
if not status then
stdnse.print_debug( string.format("ldap-search failed to bind: %s", errmsg) )
return " \n ERROR: Authentication failed"
end
-- or if ldap-brute found us something
elseif ( accounts ) then
for username, password in pairs(accounts) do
local bindParam = { version=3, ['username']=username, ['password']=password}
local status, errmsg = ldap.bindRequest( socket, bindParam )
if status then
break
end
end
end
if qfilter == "users" then
filter = { op=ldap.FILTER._or, val=
{
{ op=ldap.FILTER.equalityMatch, obj='objectClass', val='user' },
{ op=ldap.FILTER.equalityMatch, obj='objectClass', val='posixAccount' },
{ op=ldap.FILTER.equalityMatch, obj='objectClass', val='person' }
}
}
elseif qfilter == "computers" or qfilter == "computer" then
filter = { op=ldap.FILTER.equalityMatch, obj='objectClass', val='computer' }
elseif qfilter == "all" or qfilter == nil then
filter = nil -- { op=ldap.FILTER}
else
return " \n\nERROR: Unsupported Quick Filter: " .. qfilter
end
if type(attribs) == 'string' then
local tmp = attribs
attribs = {}
table.insert(attribs, tmp)
end
for _, context in ipairs(contexts) do
req = {
baseObject = context,
scope = ldap.SCOPE.sub,
derefPolicy = ldap.DEREFPOLICY.default,
filter = filter,
attributes = attribs,
['maxObjects'] = maxObjects }
status, searchResEntries = ldap.searchRequest( socket, req )
if not status then
if ( searchResEntries:match("DSID[-]0C090627") and not(username) ) then
return "ERROR: Failed to bind as the anonymous user"
else
stdnse.print_debug( string.format( "ldap.searchRequest returned: %s", searchResEntries ) )
return
end
end
local result_part = ldap.searchResultToTable( searchResEntries )
objCount = objCount + (result_part and #result_part or 0)
result_part.name = ""
if ( context ) then
result_part.name = ("Context: %s"):format(#context > 0 and context or "<empty>")
end
if ( qfilter ) then
result_part.name = result_part.name .. ("; QFilter: %s"):format(qfilter)
end
if ( attribs ) then
result_part.name = result_part.name .. ("; Attributes: %s"):format(stdnse.strjoin(",", attribs))
end
table.insert( result, result_part )
-- catch any softerrors
if searchResEntries.resultCode ~= 0 then
local output = stdnse.format_output(true, result )
output = output .. string.format("\n\n\n=========== %s ===========", searchResEntries.errorMessage )
return output
end
end
-- perform a unbind only if we have valid credentials
if ( username ) then
status = ldap.unbindRequest( socket )
end
socket:close()
-- if taken a way and ldap returns a single result, it ain't shown....
--result.name = "LDAP Results"
local output = stdnse.format_output(true, result )
if ( maxObjects ~= -1 and objCount == maxObjects ) then
output = output .. ("\n\nResult limited to %d objects (see ldap.maxobjects)"):format(maxObjects)
end
return output
end
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