[Samba] Is Samba PDC + NT4 DOM Trust using NTLMv2 possible?

Aaron J. Zirbes ajz at umn.edu
Wed Dec 5 23:34:24 GMT 2007

My Question:

Is it possible to get 2-way Interdomain Trust relationships working between a Samba domain and an
NT4 SP6a domain, while restricting all password hashes to NTLMv2 only?

Everything works except the inter-domain trust

I'm able to get the NT4 domain to trust the Samba domain, but not the other way around.

My System:

I have a perfectly running Samba domain w/ ~60 client WinXP workstations, and Win 2003 member
servers.  All machines are set to use NTLMv2 only.

My Config:

I'm running Samba Version 3.0.27a, compiled with
	--with-ldap --with-winbind --with-utmp --with-acl-support

LDAP backend with the new:

Key NTLMv2 security settings are:
   ntlm auth = no
   lanman auth = no
   client plaintext auth = no
   client lanman auth = no
   client ntlmv2 auth = yes
   client schannel = yes
   server schannel = yes
   client signing = auto
   server signing = auto

I added an idmap config section for the trusted domain

I created the "Machine" account entry in LDAP for the trusted domain.  I setup the domain trust
using the net command, I added access to one of my shares by adding TESTDOM\azirbes to the "valid
users" parameter as I usually do, but the trusted domain still prompts for a user name and password,
and the samba log dumps the following:

[2007/11/09 12:55:09, 2] smbd/sesssetup.c:setup_new_vc_session(1200)
  setup_new_vc_session: New VC == 0, if NT4.x compatible we would close all old resources.
[2007/11/09 12:55:09, 5] auth/auth_util.c:make_user_info_map(161)
  make_user_info_map: Mapping user [TESTDOM]\[azirbes] from workstation [nt4test]
[2007/11/09 12:55:09, 5] auth/auth_util.c:is_trusted_domain(2198)
  is_trusted_domain: Checking for domain trust with [TESTDOM]
[2007/11/09 12:55:09, 5] auth/auth_util.c:make_user_info(75)
  attempting to make a user_info for azirbes (azirbes)
[2007/11/09 12:55:09, 5] auth/auth_util.c:make_user_info(85)
  making strings for azirbes's user_info struct
[2007/11/09 12:55:09, 5] auth/auth_util.c:make_user_info(117)
  making blobs for azirbes's user_info struct
[2007/11/09 12:55:09, 3] auth/auth.c:check_ntlm_password(221)
  check_ntlm_password:  Checking password for unmapped user [TESTDOM]\[azirbes]@[nt4test] with the
new password interface
[2007/11/09 12:55:09, 3] auth/auth.c:check_ntlm_password(224)
  check_ntlm_password:  mapped user is: [TESTDOM]\[azirbes]@[nt4test]
[2007/11/09 12:55:09, 6] auth/auth_sam.c:check_samstrict_security(421)
  check_samstrict_security: TESTDOM is not one of my local names or domain name (DC)
[2007/11/09 12:55:09, 5] auth/auth.c:check_ntlm_password(273)
  check_ntlm_password: winbind authentication for user [azirbes] FAILED with error
[2007/11/09 12:55:09, 2] auth/auth.c:check_ntlm_password(319)
  check_ntlm_password:  Authentication for user [azirbes] -> [azirbes] FAILED with error
[2007/11/09 12:55:09, 5] auth/auth_util.c:free_user_info(2045)
  attempting to free (and zero) a user_info structure


More information about the samba mailing list