[Samba] Problem with Active Directory authentication

Data Control Systems - Mike Elkevizth mike at datacontrolsystems.com
Wed Jun 8 22:12:31 UTC 2016

What does "getent passwd <username>@<domainname>"  return on the server for
the login shell.  By default a samba AD DC sets the login shell for all
Active Directory user accounts to /bin/false.  The only way I've found to
change this, is to override that globally with the "template shell =
/bin/bash" option in smb.conf, which enables it globally for all Active
Directory users (probably not desired).

Mike E.

On Wed, Jun 8, 2016 at 3:46 PM, Kaplan, Andrew H. <AHKAPLAN at partners.org>

> Hello --
> We are running the 14.04.3 LTS 64-bit release as a virtual machine on a
> Vmware appliance. The goal of the installation is to create a Samba server
> that utilizes Active Directory authentication. To that end I utilized the
> following procedure:
> http://www.kiloroot.com/add-ubuntu-1...n-credentials/<
> http://www.kiloroot.com/add-ubuntu-14-04-server-or-desktop-to-microsoft-active-directory-domain-login-to-unity-with-domain-credentials/
> >
> Afterwards, I referenced the following documentation to confirm that all
> configuration files had the appropriate entries:
> https://help.ubuntu.com/lts/serverguide/sssd-ad.html
> The problem is the following: I am unable to log into the server from the
> console or via SSH using my Active Directory user account. The syntax that
> I use when doing an SSH connection is the following:
> ssh -v -l <username>@<domainname> <fully qualified domain name>
> The output that was generated is the following:
> OpenSSH_6.0p1 Debian-4, OpenSSL 1.0.1e 11 Feb 2013
> debug1: Reading configuration data /etc/ssh/ssh_config
> debug1: /etc/ssh/ssh_config line 19: Applying options for *
> debug1: Connecting to <fully qualified domain name> [<ip address>] port 22.
> debug1: Connection established.
> debug1: identity file /home/knoppix/.ssh/id_rsa type -1
> debug1: identity file /home/knoppix/.ssh/id_rsa-cert type -1
> debug1: identity file /home/knoppix/.ssh/id_dsa type -1
> debug1: identity file /home/knoppix/.ssh/id_dsa-cert type -1
> debug1: identity file /home/knoppix/.ssh/id_ecdsa type -1
> debug1: identity file /home/knoppix/.ssh/id_ecdsa-cert type -1
> debug1: Remote protocol version 2.0, remote software version
> OpenSSH_6.6.1p1 Ubuntu-2ubuntu2.7
> debug1: match: OpenSSH_6.6.1p1 Ubuntu-2ubuntu2.7 pat OpenSSH*
> debug1: Enabling compatibility mode for protocol 2.0
> debug1: Local version string SSH-2.0-OpenSSH_6.0p1 Debian-4
> debug1: SSH2_MSG_KEXINIT sent
> debug1: SSH2_MSG_KEXINIT received
> debug1: kex: server->client aes128-ctr hmac-md5 none
> debug1: kex: client->server aes128-ctr hmac-md5 none
> debug1: sending SSH2_MSG_KEX_ECDH_INIT
> debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
> debug1: Server host key: ECDSA
> ec:09:c1:bc:d0:11:f3:8c:45:3f:dd:3a:96:ba:2a:17
> debug1: Host '<fully qualified domain name>' is known and matches the
> ECDSA host key.
> debug1: Found key in /home/knoppix/.ssh/known_hosts:29
> debug1: ssh_ecdsa_verify: signature correct
> debug1: SSH2_MSG_NEWKEYS sent
> debug1: expecting SSH2_MSG_NEWKEYS
> debug1: SSH2_MSG_NEWKEYS received
> debug1: Roaming not allowed by server
> debug1: SSH2_MSG_SERVICE_ACCEPT received
> debug1: Authentications that can continue: publickey,password
> debug1: Next authentication method: publickey
> debug1: Trying private key: /home/knoppix/.ssh/id_rsa
> debug1: Trying private key: /home/knoppix/.ssh/id_dsa
> debug1: Trying private key: /home/knoppix/.ssh/id_ecdsa
> debug1: Next authentication method: password
> <username>@<domainname>@<fully qualified domain name>'s password:
> Connection closed by <ip address>
> Does anyone have thoughts on this?
> Thanks.
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