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Bug 1485417

Summary: Add support for samba by writing the machine account password and the domain SID to Samba's tdbs
Product: Red Hat Enterprise Linux 6 Reporter: Sumit Bose <sbose>
Component: adcliAssignee: Varun Mylaraiah <mvarun>
Status: CLOSED ERRATA QA Contact: ipa-qe <ipa-qe>
Severity: unspecified Docs Contact: Lucie Vařáková <lmanasko>
Priority: unspecified    
Version: 6.9CC: enewland, fhanzelk, jkurik, lmanasko, mvarun, nsoman, ondrej.valousek.xm, pcech, pkis, sbose, villapla
Target Milestone: rc   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: adcli-0.8.1-2.el6 Doc Type: Release Note
Doc Text:
New `adcli` feature for Samba added A new `adcli` feature has been added to the Samba suite. The feature can add a machine account password and the domain security identifier (SID) to Samba's internal TDB database when joining an Active Directory (AD) domain. It allows the Red Hat Enterprise Linux (RHEL) 6 systems with the SMB1 protocol disabled to join AD with the *net ads join* utility.
 Story Points: ---
Clone Of:
: 1593240 (view as bug list) Environment:
Last Closed: 2018-06-19 05:20:03 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On:    
Bug Blocks: 1504542, 1593240    
Attachments:
Description Flags
Verification Console output none

Description Sumit Bose 2017-08-25 15:53:17 UTC 
Description of problem:
More and more environment will drop support for SMB1 and Samba's 'net ads join ...' command to join an AD domain requires SMB1.

If SMB1 is disabled in an AD domain a RHEL6 client cannot be joined to the domain anymore with 'net ads join ....' Luckily adcli can be used to join the domain because adcli only uses LDAP and Kerberos and does not depend on SMB1.

But unfortunately Samba requires some extra settings which are done by 'net ads join ...' but currently not by adcli. Those are mainly writing the clear text machine account password and the domain SID to specific tdb databases with a specific key.

Instead of fixing 'net ads join ...' which would be a major effort since the version of Samba used in RHEL6 is unsupported by upstream since years, it would be easier to allow adcli to call 'net changesecretpw' and 'net setlocalsid' to set the machine account password and the domain SID repectively.
Comment 4 Sumit Bose 2018-02-20 10:31:27 UTC 
Steps to verify:

The goal here is to allow Samba to run as a domain member after joining with adcli instead of 'net ads join'. For this you have to create a minimal smb.conf as e.g. described in https://wiki.samba.org/index.php/Setting_up_Samba_as_a_Domain_Member#Setting_up_a_Basic_smb.conf_File (please make sure 'workgroup' and 'realm' does match your setup).

Then call adcli to join the AD domain with the new option '--add-samba-data'. After a successful join winbindd should start without issues.

As a shortcut you can check with tdbdump from the tdb-tools package that before the join /var/lib/samba/private/secrets.tdb is empty and after the join contains the domain SID and the machine account password.
Comment 7 Varun Mylaraiah 2018-04-16 16:39:44 UTC 
Created attachment 1422650 [details]
Verification Console output

Verified
[root@vm-idm-003 ~]# rpm -qa adcli
adcli-0.8.1-2.el6.x86_64


[root@vm-idm-003 ~]# adcli join ipaad2016.test --add-samba-data
Password for Administrator: 


[root@vm-idm-003 ~]# tdbdump  /var/lib/samba/private/secrets.tdb
{
key(42) = "SECRETS/MACHINE_SEC_CHANNEL_TYPE/IPAAD2016"
data(4) = "\02\00\00\00"
}
{
key(42) = "SECRETS/MACHINE_LAST_CHANGE_TIME/IPAAD2016"
data(4) = "\D3\CE\D4Z"
}
{
key(34) = "SECRETS/MACHINE_PASSWORD/IPAAD2016"
data(121) = "Rxq9GtoA_SMCw7[j9p1nRhn^poB=ojnAD1&RSE.mgL2AJ7Ji\5C#;8ISR^2KL45Ou29ab@A-[U4gN-8DFQuw[+[t>sd?PgtCEKM^9buJ8tt#WYXCUv#6GbD1+=\00"
}
{
key(21) = "SECRETS/SID/IPAAD2016"
data(68) = "\01\04\00\00\00\00\00\05\15\00\00\007\16w0\C3&v\DEq\D61_\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00\00"
}
Comment 12 errata-xmlrpc 2018-06-19 05:20:03 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2018:1902