mirror of
https://github.com/nmap/nmap.git
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o [NSE] Added a new library for LDAP and two new scripts:
- ldap-brute uses the unpwdb library to guess credentials for LDAP - ldap-rootdse retrieves the LDAP root DSA-specific Entry (DSE)
This commit is contained in:
patrik
255
scripts/ldap-brute.nse
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255
scripts/ldap-brute.nse
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@@ -0,0 +1,255 @@
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description = [[
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Performs password guessing against LDAP
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]]
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---
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-- @usage
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-- nmap -p 389 --script ldap-brute --script-args
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-- ldap.base='"cn=users,dc=cqure,dc=net"' <host>
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--
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-- @output
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-- 389/tcp open ldap
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-- | ldap-brute:
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-- |_ ldaptest:ldaptest => Login Correct
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--
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-- @args ldap.base If set, the script will use it as a base for the password
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-- guessing attempts. If unset the user list must either contain the
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-- distinguished name of each user or the server must support
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-- authentication using a simple user name. See AD discussion below.
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--
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-- Additional information
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-- ----------------------
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-- This script makes attempts to brute force LDAP authentication. By default
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-- it uses the builtin user- and password-list to do so. In order to use your
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-- own lists use the userdb and passdb script arguments.
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--
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-- WARNING: This script does not make ANY attempt to prevent account lockout!
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-- If the number of passwords in the dictionary exceed the amount of
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-- allowed tries, accounts will be locked out. This usually happens
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-- *VERY* quickly.
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--
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-- Active Directory and LDAP
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-- -------------------------
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-- Note: Authenticating against Active Directory using LDAP does not use the
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-- Windows user name but the user accounts distinguished name. LDAP on Windows
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-- 2003 allows authentication using a simple user name rather than using the
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-- fully distinguished name. Eg:
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-- - Patrik Karlsson vs. cn=Patrik Karlsson,cn=Users,dc=cqure,dc=net
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-- This type of authentication is not supported on eg. OpenLDAP
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--
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-- This script uses some AD specific support and optimizations:
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--
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-- o LDAP on Windows 2003 reports different error messages depending on whether
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-- an account exists or not. If the script recieves an error indicating that
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-- the username does not exist it simply stops guessing passwords for this
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-- account and moves on to the next.
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--
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-- o The script attempts to authenticate with the username only if no LDAP base
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-- is specified. The benefit of authenticating this way is that the LDAP path
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-- of each account does not need to be known in advance as it's looked up by
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-- the server.
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--
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-- Credits
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-- -------
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-- o The get_random_string function was borrowed from the smb-psexec script.
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--
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author = "Patrik Karlsson"
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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 'stdnse'
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require 'ldap'
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require 'unpwdb'
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require 'comm'
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-- Version 0.3
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-- Created 01/20/2010 - v0.1 - created by Patrik Karlsson
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-- Revised 01/26/2010 - v0.2 - cleaned up unpwdb related code, fixed ssl stuff
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-- Revised 02/17/2010 - v0.3 - added AD specific checks and fixed bugs related to LDAP base
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portrule = shortport.port_or_service({389,636}, {"ldap","ldapssl"})
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--- Tries to determine a valid naming context to use to validate credentials
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--
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-- @param socket socket already connected to LDAP server
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-- @return string containing a valid naming context
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function get_naming_context( socket )
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local req = { baseObject = "", scope = ldap.SCOPE.base, derefPolicy = ldap.DEREFPOLICY.default, attributes = { "defaultNamingContext", "namingContexts" } }
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local status, searchResEntries = ldap.searchRequest( socket, req )
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if not status then
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return nil
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end
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local contexts = ldap.extractAttribute( searchResEntries, "defaultNamingContext" )
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-- OpenLDAP does not have a defaultNamingContext
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if not contexts then
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contexts = ldap.extractAttribute( searchResEntries, "namingContexts" )
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end
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if #contexts > 0 then
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return contexts[1]
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end
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return nil
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end
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--- Attempts to validate the credentials by requesting the base object of the supplied context
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--
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-- @param socket socket already connected to the LDAP server
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-- @param context string containing the context to search
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-- @return true if credentials are valid and search was a success, false if not.
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function is_valid_credential( socket, context )
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local req = { baseObject = context, scope = ldap.SCOPE.base, derefPolicy = ldap.DEREFPOLICY.default, attributes = nil }
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local status, searchResEntries = ldap.searchRequest( socket, req )
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return status
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end
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action = function( host, port )
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local result, response, status, context, valid_accounts = {}, nil, nil, nil, {}
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local usernames, passwords, username, password, fq_username
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local user_cnt, invalid_account_cnt, tot_tries = 0, 0, 0
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local aborted
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local max_time = unpwdb.timelimit() ~= nil and unpwdb.timelimit() * 1000 or -1
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local clock_start = nmap.clock_ms()
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local ldap_anonymous_bind = string.char( 0x30, 0x0c, 0x02, 0x01, 0x01, 0x60, 0x07, 0x02, 0x01, 0x03, 0x04, 0x00, 0x80, 0x00 )
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local socket, _, opt = comm.tryssl( host, port, ldap_anonymous_bind, nil )
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local base_dn = nmap.registry.args['ldap.base']
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if not socket then
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return
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end
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-- We close and re-open the socket so that the anonymous bind does not distract us
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socket:close()
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-- set a reasonable timeout value
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socket:set_timeout(5000)
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status = socket:connect(host.ip, port.number, opt)
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if not status then
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return
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end
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context = get_naming_context(socket)
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if not context then
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stdnse.print_debug("Failed to retrieve namingContext")
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socket:close()
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return
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end
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status, usernames = unpwdb.usernames()
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if not status then
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return
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end
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status, passwords = unpwdb.passwords()
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if not status then
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return
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end
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for username in usernames do
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-- is the aborted flag set
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if ( aborted ) then
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break
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end
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-- if a base DN was set append our username (CN) to the base
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if base_dn then
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fq_username = ("cn=%s,%s"):format(username, base_dn)
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else
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fq_username = username
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end
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user_cnt = user_cnt + 1
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for password in passwords do
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-- Should we abort?
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if max_time>0 and nmap.clock_ms() - clock_start > max_time then
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aborted=true
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break
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end
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tot_tries = tot_tries + 1
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-- handle special case where we want to guess the username as password
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if password == "%username%" then
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password = username
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end
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stdnse.print_debug( "Trying %s/%s ...", fq_username, password )
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status, response = ldap.bindRequest( socket, { version=3, ['username']=fq_username, ['password']=password} )
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-- if the DN (username) does not exist, break loop
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if not status and response:match("invalid DN") then
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stdnse.print_debug( "%s returned: \"Invalid DN\"", fq_username )
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invalid_account_cnt = invalid_account_cnt + 1
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break
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end
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-- Is AD telling us the account does not exist?
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if not status and response:match("AcceptSecurityContext error, data 525, vece") then
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invalid_account_cnt = invalid_account_cnt + 1
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break
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end
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-- Account Locked Out
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if not status and response:match("AcceptSecurityContext error, data 775, vece") then
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table.insert( valid_accounts, string.format("%s => Account locked out", fq_username ) )
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break
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end
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-- Login correct, account disabled
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if not status and response:match("AcceptSecurityContext error, data 533, vece") then
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table.insert( valid_accounts, string.format("%s:%s => Login correct, account disabled", fq_username, password:len()>0 and password or "<empty>" ) )
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break
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end
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-- Login correct, user must change password
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if not status and response:match("AcceptSecurityContext error, data 773, vece") then
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table.insert( valid_accounts, string.format("%s:%s => Login correct, user must change password", fq_username, password:len()>0 and password or "<empty>" ) )
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break
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end
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--Login, correct
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if status then
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status = is_valid_credential( socket, context )
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if status then
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table.insert( valid_accounts, string.format("%s:%s => Login correct", fq_username, password:len()>0 and password or "<empty>" ) )
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-- Add credentials for other ldap scripts to use
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if nmap.registry.ldapaccounts == nil then
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nmap.registry.ldapaccounts = {}
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end
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nmap.registry.ldapaccounts[fq_username]=password
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break
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end
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end
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end
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passwords("reset")
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end
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stdnse.print_debug( "Finnished brute against LDAP, total tries: %d, tps: %d", tot_tries, ( tot_tries / ( ( nmap.clock_ms() - clock_start ) / 1000 ) ) )
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if ( invalid_account_cnt == user_cnt and base_dn ~= nil ) then
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return "WARNING: All usernames were invalid. Invalid LDAP base?"
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end
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local output = stdnse.format_output(true, valid_accounts) or ""
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if ( max_time > 0 and aborted ) then
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output = output .. string.format(" \n\nNOTE: script aborted execution after %d seconds", max_time/1000 )
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end
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return output
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end
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151
scripts/ldap-rootdse.nse
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151
scripts/ldap-rootdse.nse
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@@ -0,0 +1,151 @@
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description = [[
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Retrieves the LDAP root DSA-specific Entry (DSE)
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]]
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---
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--
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-- @usage
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-- nmap -p 389 --script ldap-rootdse <host>
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--
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-- @output
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-- PORT STATE SERVICE
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-- 389/tcp open ldap
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-- | ldap-rootdse:
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-- | currentTime: 20100112092616.0Z
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-- | subschemaSubentry: CN=Aggregate,CN=Schema,CN=Configuration,DC=cqure,DC=net
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-- | dsServiceName: CN=NTDS Settings,CN=LDAPTEST001,CN=Servers,CN=Default-First-Site,CN=Sites,CN=Configuration,DC=cqure,DC=net
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-- | namingContexts: DC=cqure,DC=net
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-- | namingContexts: CN=Configuration,DC=cqure,DC=net
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-- | namingContexts: CN=Schema,CN=Configuration,DC=cqure,DC=net
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-- | namingContexts: DC=DomainDnsZones,DC=cqure,DC=net
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-- | namingContexts: DC=ForestDnsZones,DC=cqure,DC=net
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-- | namingContexts: DC=TAPI3Directory,DC=cqure,DC=net
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-- | defaultNamingContext: DC=cqure,DC=net
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-- | schemaNamingContext: CN=Schema,CN=Configuration,DC=cqure,DC=net
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-- | configurationNamingContext: CN=Configuration,DC=cqure,DC=net
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-- | rootDomainNamingContext: DC=cqure,DC=net
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-- | supportedControl: 1.2.840.113556.1.4.319
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-- | .
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-- | .
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-- | supportedControl: 1.2.840.113556.1.4.1948
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-- | supportedLDAPVersion: 3
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-- | supportedLDAPVersion: 2
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-- | supportedLDAPPolicies: MaxPoolThreads
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-- | supportedLDAPPolicies: MaxDatagramRecv
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-- | supportedLDAPPolicies: MaxReceiveBuffer
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-- | supportedLDAPPolicies: InitRecvTimeout
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-- | supportedLDAPPolicies: MaxConnections
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-- | supportedLDAPPolicies: MaxConnIdleTime
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-- | supportedLDAPPolicies: MaxPageSize
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-- | supportedLDAPPolicies: MaxQueryDuration
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-- | supportedLDAPPolicies: MaxTempTableSize
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-- | supportedLDAPPolicies: MaxResultSetSize
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-- | supportedLDAPPolicies: MaxNotificationPerConn
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-- | supportedLDAPPolicies: MaxValRange
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-- | highestCommittedUSN: 126991
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-- | supportedSASLMechanisms: GSSAPI
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-- | supportedSASLMechanisms: GSS-SPNEGO
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-- | supportedSASLMechanisms: EXTERNAL
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-- | supportedSASLMechanisms: DIGEST-MD5
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-- | dnsHostName: EDUSRV011.cqure.local
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-- | ldapServiceName: cqure.net:edusrv011$@CQURE.NET
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-- | serverName: CN=EDUSRV011,CN=Servers,CN=Default-First-Site,CN=Sites,CN=Configuration,DC=cqure,DC=net
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-- | supportedCapabilities: 1.2.840.113556.1.4.800
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-- | supportedCapabilities: 1.2.840.113556.1.4.1670
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-- | supportedCapabilities: 1.2.840.113556.1.4.1791
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-- | isSynchronized: TRUE
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-- | isGlobalCatalogReady: TRUE
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-- | domainFunctionality: 0
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-- | forestFunctionality: 0
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-- |_ domainControllerFunctionality: 2
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--
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--
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-- The root DSE object may contain a number of different attributes as described in RFC 2251 section 3.4:
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-- * namingContexts: naming contexts held in the server
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-- * subschemaSubentry: subschema entries (or subentries) known by this server
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-- * altServer: alternative servers in case this one is later unavailable.
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-- * supportedExtension: list of supported extended operations.
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-- * supportedControl: list of supported controls.
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-- * supportedSASLMechanisms: list of supported SASL security features.
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-- * supportedLDAPVersion: LDAP versions implemented by the server.
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--
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-- The above example, which contains a lot more information is from Windows 2003 accessible without authentication.
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-- The same request against OpenLDAP will result in significantly less information.
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--
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-- The ldap-search script queries the root DSE for the namingContexts and/or defaultNamingContexts, which it sets as base
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-- if no base object was specified
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--
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-- Credit goes out to Martin Swende who provided me with the initial code that got me started writing this.
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--
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-- Version 0.2
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-- Created 01/12/2010 - v0.1 - created by Patrik Karlsson <patrik@cqure.net>
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-- Revised 01/20/2010 - v0.2 - added SSL support
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author = "Patrik Karlsson"
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copyright = "Patrik Karlsson"
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license = "Same as Nmap--See http://nmap.org/book/man-legal.html"
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categories = {"discovery", "safe"}
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require "ldap"
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require 'shortport'
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require 'comm'
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portrule = shortport.port_or_service({389,636}, {"ldap","ldapssl"})
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function action(host,port)
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local socket = nmap.new_socket()
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local status, searchResEntries, req, result, opt
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-- In order to discover what protocol to use (SSL/TCP) we need to send a few bytes to the server
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-- An anonymous bind should do it
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local ldap_anonymous_bind = string.char( 0x30, 0x0c, 0x02, 0x01, 0x01, 0x60, 0x07, 0x02, 0x01, 0x03, 0x04, 0x00, 0x80, 0x00 )
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socket, _, opt = comm.tryssl( host, port, ldap_anonymous_bind, nil )
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if not socket then
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return
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end
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-- We close and re-open the socket so that the anonymous bind does not distract us
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socket:close()
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status = socket:connect(host.ip, port.number, opt)
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socket:set_timeout(10000)
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-- Searching for an empty argument list against LDAP on W2K3 returns all attributes
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-- This is not the case for OpenLDAP, so we do a search for an empty attribute list
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-- Then we compare the results against some known and expected returned attributes
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req = { baseObject = "", scope = ldap.SCOPE.base, derefPolicy = ldap.DEREFPOLICY.default }
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status, searchResEntries = ldap.searchRequest( socket, req )
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-- Check if we were served all the results or not?
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if not ldap.extractAttribute( searchResEntries, "namingContexts" ) and
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not ldap.extractAttribute( searchResEntries, "supportedLDAPVersion" ) then
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-- The namingContexts was not there, try to query all attributes instead
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-- Attributes extracted from Windows 2003 and complemented from RFC
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local attribs = {"_domainControllerFunctionality","configurationNamingContext","currentTime","defaultNamingContext",
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"dnsHostName","domainFunctionality","dsServiceName","forestFunctionality","highestCommittedUSN",
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"isGlobalCatalogReady","isSynchronized","ldap-get-baseobject","ldapServiceName","namingContexts",
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"rootDomainNamingContext","schemaNamingContext","serverName","subschemaSubentry",
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"supportedCapabilities","supportedControl","supportedLDAPPolicies","supportedLDAPVersion",
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"supportedSASLMechanisms", "altServer", "supportedExtension"}
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req = { baseObject = "", scope = ldap.SCOPE.base, derefPolicy = ldap.DEREFPOLICY.default, attributes = attribs }
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status, searchResEntries = ldap.searchRequest( socket, req )
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end
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if not status then
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socket:close()
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return
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end
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result = ldap.searchResultToTable( searchResEntries )
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socket:close()
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-- if taken a way and ldap returns a single result, it ain't shown....
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result.name = "LDAP Results"
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return stdnse.format_output(true, result )
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end
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@@ -39,6 +39,8 @@ Entry { filename = "http-vmware-path-vuln.nse", categories = { "default", "safe"
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Entry { filename = "iax2-version.nse", categories = { "version", } }
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Entry { filename = "imap-capabilities.nse", categories = { "default", "safe", } }
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Entry { filename = "irc-info.nse", categories = { "default", "discovery", "safe", } }
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Entry { filename = "ldap-brute.nse", categories = { "auth", "intrusive", } }
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Entry { filename = "ldap-rootdse.nse", categories = { "discovery", "safe", } }
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Entry { filename = "lexmark-config.nse", categories = { "discovery", "safe", } }
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Entry { filename = "mongodb-databases.nse", categories = { "default", "discovery", "safe", } }
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Entry { filename = "mongodb-info.nse", categories = { "default", "discovery", "safe", } }
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