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# -*- coding: utf-8 -*-
# $OpenLDAP$
## This work is part of OpenLDAP Software <http://www.openldap.org/>.
##
## Copyright 2016-2021 Ondřej Kuzník, Symas Corp.
## Copyright 2021-2022 The OpenLDAP Foundation.
## All rights reserved.
##
## Redistribution and use in source and binary forms, with or without
## modification, are permitted only as authorized by the OpenLDAP
## Public License.
##
## A copy of this license is available in the file LICENSE in the
## top-level directory of the distribution or, alternatively, at
## <http://www.OpenLDAP.org/license.html>.
from __future__ import print_function
import hashlib
import hmac
import os
import struct
import sys
import time
import ldap
from ldap.cidict import cidict as CIDict
from ldap.ldapobject import LDAPObject
if len(sys.argv) > 1 and sys.argv[1] == "--check":
raise SystemExit(0)
def get_digits(h, digits):
offset = h[19] & 15
number = struct.unpack(">I", h[offset:offset+4])[0] & 0x7fffffff
number %= (10 ** digits)
return ("%0*d" % (digits, number)).encode()
def get_hotp_token(secret, interval_no):
msg = struct.pack(">Q", interval_no)
h = hmac.new(secret, msg, hashlib.sha1).digest()
return get_digits(bytearray(h), 6)
def get_interval(period=30):
return int(time.time() // period)
def get_token_for(connection, dn, typ="totp"):
result = connection.search_s(dn, ldap.SCOPE_BASE)
dn, attrs = result[0]
attrs = CIDict(attrs)
tokendn = attrs['oath'+typ+'token'][0].decode()
result = connection.search_s(tokendn, ldap.SCOPE_BASE)
dn, attrs = result[0]
attrs = CIDict(attrs)
return dn, attrs
def main():
uri = os.environ["URI1"]
managerdn = os.environ['MANAGERDN']
passwd = os.environ['PASSWD']
babsdn = os.environ['BABSDN']
babspw = b"bjensen"
bjornsdn = os.environ['BJORNSDN']
bjornspw = b"bjorn"
connection = LDAPObject(uri)
start = time.time()
connection.bind_s(managerdn, passwd)
end = time.time()
if end - start > 1:
print("It takes more than a second to connect and bind, "
"skipping potentially unstable test", file=sys.stderr)
raise SystemExit(0)
dn, token_entry = get_token_for(connection, babsdn)
paramsdn = token_entry['oathTOTPParams'][0].decode()
result = connection.search_s(paramsdn, ldap.SCOPE_BASE)
_, attrs = result[0]
params = CIDict(attrs)
secret = token_entry['oathSecret'][0]
period = int(params['oathTOTPTimeStepPeriod'][0].decode())
bind_conn = LDAPObject(uri)
interval_no = get_interval(period)
token = get_hotp_token(secret, interval_no-3)
print("Testing old tokens are not useable")
bind_conn.bind_s(babsdn, babspw+token)
try:
bind_conn.bind_s(babsdn, babspw+token)
except ldap.INVALID_CREDENTIALS:
pass
else:
raise SystemExit("Bind with an old token should have failed")
interval_no = get_interval(period)
token = get_hotp_token(secret, interval_no)
print("Testing token can only be used once")
bind_conn.bind_s(babsdn, babspw+token)
try:
bind_conn.bind_s(babsdn, babspw+token)
except ldap.INVALID_CREDENTIALS:
pass
else:
raise SystemExit("Bind with a reused token should have failed")
token = get_hotp_token(secret, interval_no+1)
try:
bind_conn.bind_s(babsdn, babspw+token)
except ldap.INVALID_CREDENTIALS:
raise SystemExit("Bind should have succeeded")
dn, token_entry = get_token_for(connection, babsdn)
last = int(token_entry['oathTOTPLastTimeStep'][0].decode())
if last != interval_no+1:
SystemExit("Unexpected counter value %d (expected %d)" %
(last, interval_no+1))
print("Resetting counter and testing secret sharing between accounts")
connection.modify_s(dn, [(ldap.MOD_REPLACE, 'oathTOTPLastTimeStep', [])])
interval_no = get_interval(period)
token = get_hotp_token(secret, interval_no)
try:
bind_conn.bind_s(bjornsdn, bjornspw+token)
except ldap.INVALID_CREDENTIALS:
raise SystemExit("Bind should have succeeded")
try:
bind_conn.bind_s(babsdn, babspw+token)
except ldap.INVALID_CREDENTIALS:
pass
else:
raise SystemExit("Bind with a reused token should have failed")
print("Testing token is retired even with a wrong password")
connection.modify_s(dn, [(ldap.MOD_REPLACE, 'oathTOTPLastTimeStep', [])])
interval_no = get_interval(period)
token = get_hotp_token(secret, interval_no)
try:
bind_conn.bind_s(babsdn, b"not the password"+token)
except ldap.INVALID_CREDENTIALS:
pass
else:
raise SystemExit("Bind with an incorrect password should have failed")
try:
bind_conn.bind_s(babsdn, babspw+token)
except ldap.INVALID_CREDENTIALS:
pass
else:
raise SystemExit("Bind with a reused token should have failed")
token = get_hotp_token(secret, interval_no+1)
try:
bind_conn.bind_s(babsdn, babspw+token)
except ldap.INVALID_CREDENTIALS:
raise SystemExit("Bind should have succeeded")
if __name__ == "__main__":
sys.exit(main())
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