Dave Beach
2016-Feb-29 00:04 UTC
[Samba] Samba after upgrade+migration, Win7 workstation trusts lost
Hello list - I am not sure my messages are getting out to the list, so I
will attempt in this message to summarize the problems I am having that have
been the subject of a few other posts.
I recently upgraded from a command-line Slackware installation to Debian
Jessie. As part of that exercise, Samba was upgraded from 3.5.x to 4.1.17.
My upgrade method was probably not idea: I recursively copied all files from
the system root to an external USB hard disk, installed new hard disks, did
the Debian install. I say this to emphasize the point that I have all the
files (and, indeed, the hard disk) from the previous installation available
to me. I started with the new sample Samba config file, and copied what
seemed to be relevant items from my previous config file. I copied
secrets.tdb from the previous implementation to the appropriate new
directory.
I use ldap as my password backend, and have finally managed to get that
working.
Testparm runs cleanly, and Samba starts.
I am having two problems:
First, trusts have been lost with the Win7 workstations in the domain. I
would like to recover those trusts with no effect to the user accounts on
the workstations. All workstations use local profiles. I can log on to the
workstations using cached credentials, but any attempt to log on to them
with Samba running on the server fails. So, I stop Samba on the server, log
on to the workstations, restart Samba on the server. Doing this, I can map
drives on the workstations to shares on the server.
The server log for these unsuccessful logons reveals the following:
[2016/02/28 07:29:41.326070, 3]
../source3/lib/smbldap.c:1013(smbldap_connect_system)
ldap_connect_system: successful connection to the LDAP server
[2016/02/28 07:29:41.327306, 2]
../source3/passdb/pdb_ldap.c:524(init_sam_from_ldap)
init_sam_from_ldap: Entry found for user: pc-dave$
[2016/02/28 07:29:41.421827, 3]
../source3/passdb/lookup_sid.c:1560(get_primary_group_sid)
Forcing Primary Group to 'Domain Users' for pc-dave$
[2016/02/28 07:29:41.422496, 3]
../source3/rpc_server/samr/srv_samr_nt.c:2947(_samr_QueryUserInfo)
User:[pc-dave$]
[2016/02/28 07:29:41.422738, 3]
../source3/rpc_server/samr/srv_samr_nt.c:2947(_samr_QueryUserInfo)
User:[pc-dave$]
[2016/02/28 07:29:41.422862, 3]
../source3/rpc_server/samr/srv_samr_nt.c:2650(get_user_info_18)
User:[pc-dave$] 0x80
[2016/02/28 07:29:41.423014, 2]
../libcli/auth/credentials.c:381(netlogon_creds_server_check_internal)
credentials check failed
[2016/02/28 07:29:41.423066, 0]
../source3/rpc_server/netlogon/srv_netlog_nt.c:997(_netr_ServerAuthenticate3
)
_netr_ServerAuthenticate3: netlogon_creds_server_check failed. Rejecting
auth request from client PC-DAVE machine account PC-DAVE$
[2016/02/28 07:29:41.424260, 3]
../source3/rpc_server/srv_pipe_hnd.c:122(free_pipe_context)
free_pipe_context: destroying talloc pool of size 30
[2016/02/28 07:29:41.425680, 3]
../source3/rpc_server/srv_pipe.c:1371(api_rpcTNP)
api_rpcTNP: rpc command: NETR_SERVERREQCHALLENGE
[2016/02/28 07:29:41.426741, 3]
../source3/rpc_server/srv_pipe_hnd.c:122(free_pipe_context)
free_pipe_context: destroying talloc pool of size 30
[2016/02/28 07:29:41.427734, 3]
../source3/rpc_server/srv_pipe.c:1371(api_rpcTNP)
api_rpcTNP: rpc command: NETR_SERVERAUTHENTICATE3
[2016/02/28 07:29:41.427972, 2]
../source3/rpc_server/samr/srv_samr_nt.c:4004(_samr_LookupDomain)
Returning domain sid for domain DRBHOME ->
S-1-5-21-379225270-2612589903-3976116126
[2016/02/28 07:29:41.428800, 2]
../source3/passdb/pdb_ldap.c:524(init_sam_from_ldap)
init_sam_from_ldap: Entry found for user: pc-dave$
[2016/02/28 07:29:41.430068, 3]
../source3/passdb/lookup_sid.c:1560(get_primary_group_sid)
Forcing Primary Group to 'Domain Users' for pc-dave$
[2016/02/28 07:29:41.430827, 3]
../source3/rpc_server/samr/srv_samr_nt.c:2947(_samr_QueryUserInfo)
User:[pc-dave$]
[2016/02/28 07:29:41.431081, 3]
../source3/rpc_server/samr/srv_samr_nt.c:2947(_samr_QueryUserInfo)
User:[pc-dave$]
[2016/02/28 07:29:41.431203, 3]
../source3/rpc_server/samr/srv_samr_nt.c:2650(get_user_info_18)
User:[pc-dave$] 0x80
[2016/02/28 07:29:41.431364, 2]
../libcli/auth/credentials.c:381(netlogon_creds_server_check_internal)
credentials check failed
[2016/02/28 07:29:41.431467, 0]
../source3/rpc_server/netlogon/srv_netlog_nt.c:997(_netr_ServerAuthenticate3
)
_netr_ServerAuthenticate3: netlogon_creds_server_check failed. Rejecting
auth request from client PC-DAVE machine account PC-DAVE$
The second problem I am having is that I cannot join workstations to the
domain. While trying to debug the first problem, I dropped one workstation
from the domain and tried to rejoin it. The server log evidence suggests
that LANMAN passwords are not permitted for the root account; root is the
account I used to use in the old Samba to join workstations.
Here's a log snippet:
[2016/02/28 08:51:03.846521, 3]
../source3/auth/auth.c:177(auth_check_ntlm_password)
check_ntlm_password: Checking password for unmapped user
[DRBHOME]\[root]@[PC-TV] with the new password interface
[2016/02/28 08:51:03.846613, 3]
../source3/auth/auth.c:180(auth_check_ntlm_password)
check_ntlm_password: mapped user is: [DRBHOME]\[root]@[PC-TV]
[2016/02/28 08:51:03.847018, 2]
../source3/lib/smbldap.c:794(smbldap_open_connection)
smbldap_open_connection: connection opened
[2016/02/28 08:51:03.848885, 3]
../source3/lib/smbldap.c:1013(smbldap_connect_system)
ldap_connect_system: successful connection to the LDAP server
[2016/02/28 08:51:03.850001, 2]
../source3/passdb/pdb_ldap.c:524(init_sam_from_ldap)
init_sam_from_ldap: Entry found for user: root
[2016/02/28 08:51:03.852731, 3]
../source3/passdb/lookup_sid.c:1560(get_primary_group_sid)
Forcing Primary Group to 'Domain Users' for root
[2016/02/28 08:51:03.853376, 3]
../libcli/auth/ntlm_check.c:398(ntlm_password_check)
ntlm_password_check: NTLMv2 password check failed
[2016/02/28 08:51:03.853476, 3]
../libcli/auth/ntlm_check.c:443(ntlm_password_check)
ntlm_password_check: Lanman passwords NOT PERMITTED for user root
[2016/02/28 08:51:03.853766, 3]
../libcli/auth/ntlm_check.c:587(ntlm_password_check)
ntlm_password_check: LM password, NT MD4 password in LM field and LMv2
failed for user root
[2016/02/28 08:51:03.853974, 2]
../source3/passdb/pdb_ldap.c:1139(init_ldap_from_sam)
init_ldap_from_sam: Setting entry for user: root
[2016/02/28 08:51:03.854105, 3]
../source3/auth/auth_winbind.c:60(check_winbind_security)
check_winbind_security: Not using winbind, requested domain [DRBHOME] was
for this SAM.
[2016/02/28 08:51:03.854183, 2]
../source3/auth/auth.c:288(auth_check_ntlm_password)
check_ntlm_password: Authentication for user [root] -> [root] FAILED with
error NT_STATUS_WRONG_PASSWORD
[2016/02/28 08:51:03.854326, 2]
../auth/gensec/spnego.c:743(gensec_spnego_server_negTokenTarg)
SPNEGO login failed: NT_STATUS_WRONG_PASSWORD
[2016/02/28 08:51:03.855690, 3]
../source3/smbd/server_exit.c:221(exit_server_common)
Server exit (NT_STATUS_CONNECTION_RESET)
Here is part of my smb.conf, excluding only share information, as well as
comment lines and disabled parameters:
[global]
workgroup = DRBHOME
dns proxy = no
interfaces = eth1
bind interfaces only = yes
log file = /var/log/samba/log.%m
max log size = 8192
syslog = 0
panic action = /usr/share/samba/panic-action %d
server role = classic primary domain controller
passdb backend = ldapsam
obey pam restrictions = no
unix password sync = yes
passwd program = /usr/sbin/smbldap-passwd -u %u
passwd chat = *Enter\snew\s*\spassword:* %n\n *Retype\snew\s*\spassword:*
%n\n *password\supdated\ssuccessfully* .
map to guest = never
logon script = netlogon.cmd
add user script = /usr/sbin/smbldap-useradd -m "%u"
add machine script = /usr/sbin/smbldap-useradd -w "%u"
add group script = /usr/sbin/smbldap-groupadd -p "%g"
time server = yes
security = user
domain logons = yes
domain master = yes
lanman auth = no
ldap admin dn = "cn=admin,dc=drbhome,dc=ca"
ldap delete dn = yes
ldap group suffix = ou=Groups
ldap idmap suffix = ou=Users
ldap machine suffix = ou=Computers
ldap passwd sync = yes
ldap ssl = off
ldap suffix = "dc=drbhome,dc=ca"
ldap user suffix = ou=Users
local master = yes
log level = 3
name resolve order = lmhosts host bcast
netbios name = DRBGATE
os level = 20
preferred master = yes
client lanman auth = no
client ntlmv2 auth = yes
client plaintext auth = no
add user to group script = /usr/sbin/smbldap-groupmod -m "%u"
"%g"
deadtime = 5
delete group script = /usr/sbin/smbldap-groupdel "%g%
delete user from group script = /usr/sbin/smbldap-groupmod -x "%u"
"%g"
delete user script = /usr/sbin/smbldap-userdel "%u"
encrypt passwords = yes
hosts allow = 192.168.2. 127.
set primary group script = /usr/sbin/smbldap-usermod -g "%g"
"%u"
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