Client Authentication:Ubuntu
Ubuntu 9.10 Authentication
Introduction
The following details the setup of Ubuntu 9.10 Karmic Koala as a desktop to authenticate users against SME. The method has been tested using Ubuntu installed in a VirtualBox virtual machine on a Windows XP host. It assumes login is via the gui interface.
Install Ubuntu
Download the Ubuntu .iso and install.
Complete install, login and apply all updates. Install the 'Guest Additions'.
Additional Packages
Use the 'System - Administration - Synaptic Package Manager' to install additional packages
auth_client_config winbind libpam_mount
Samba Modifications
Open an 'Applications - Accessories - Terminal' cli and change to root privileges
sudo su
Open and edit /etc/samba/smb.conf. Find the relevant lines and alter them or uncomment them as below. Some lines may not exist and may need to be added.
workgroup = <WORKGROUP> wins server = <ip of sme server> name resolve order = wins host lmhosts bcast security = domain password server = <ip of sme server> socket options = TCP_NODELAY idmap uid = 5000-20000 idmap gid = 5000-20000 template shell = /bin/bash template homedir = /home/%D/%U winbind enum user = yes winbind enum groups = yes winbind cache time = 10 winbind use default domain = yes
Replace <WORKGROUP> above (and below) with the 'Windows workgroup' name of your SME server. Replace <ip of sme server> above with the internal network ip address of your SME server.
To check validation of smb.conf, run
testparm
If all OK, then run
net rpc join -D <WORKGROUP> -U admin
Enter the admin password for the SME server when prompted and you should get a message,
Joined domain <WORKGROUP>
Now restart the machine, login, open a Terminal cli and 'sudo su' again.
The following commands should now list users and groups respectively from the SME server
wbinfo -u wbinfo -g
Authentication Modifications
Open and edit /etc/nsswitch.conf and find the hosts: line. Change it to
hosts: files wins dns
Change to the auth-client-config tool profile directory
cd /etc/auth-client-config/profile.d
Create and edit a new file called acc-sme, and enter
[sme-nt4-1]
nss_group=group: compat winbind
nss_netgroup=netgroup: nis
nss_passwd=passwd: compat winbind
nss_shadow=shadow: compat winbind
pam_account=account [success=2 new_authtok_reqd=done default=ignore] pam_winbind.so
account [success=1 default=ignore] pam_unix.so use_first_pass use_authtok
account requisite pam_deny.so
account required pam_permit.so
pam_auth=auth [success=2 default=ignore] pam_winbind.so
auth [success=1 default=ignore] pam_unix.so nullok use_first_pass use_authtok
auth requisite pam_deny.so
auth required pam_permit.so
auth required pam_securetty.so
auth optional pam_mount.so enable_pam_password
pam_password=password [success=2 default=ignore] pam_unix.so obscure sha512
password [success=1 default=ignore] pam_winbind.so use_first_pass md5 use_authtok
password requisite pam_deny.so
password required pam_permit.so
password optional pam_gnome_keyring.so
pam_session=session [default=1] pam_permit.so
session requisite pam_deny.so
session required pam_permit.so
session optional pam_winbind.so
session required pam_unix.so
session required pam_mkhomedir.so skel=/etc/skel umask=0022
session optional pam_mount.so enable_pam_password
session optional pam_ck_connector.so nox11
Save the file. Apply the pam authorisation changes
auth-client-config -a -p sme
Automount User Home Directories at Login
cd /etc/security
Open and edit pam_mount.conf.xml file. Find the 'Volume Definitions' section. Add a volume line below the header
<volume fstype="cifs" server="<SMESERVER>" path="homes" mountpoint="~/nethome" options="nosuid,nodev" />
Replace <SMESERVER> above with the samba name of your SME server. This will mount the users 'home' directory from SME into a directory called 'nethome' in their local home directory.
Login and Test
Exit the Terminal cli
Logout of Ubuntu.
Login as a valid SME server user on your system, just giving username and password. No need for DOMAIN/user as samba configured above to use the default Windows Workgroup
Authentication against SME should proceed and the user log in. A home directory on the local machine should be created as /home/DOMAIN/user, and a sub directory to that called 'nethome' mounted to the users home directory on the SME server. The mount point should also appear on the users gui desktop.
Issues / ToDo
The above was tested on a VirtualBox virtual machine. The login appears to stall after username and password entered due to the mount of the home directory, but this does complete after a little while. Appears to be due to NAT traversal and WINS lookup as VM is using NAT and a different subnet. Couldn't get bridged mode to work, and haven't installed on a dedicated machine on the same subnet to confirm. Login is a little slow therefore.
Haven't tested or altered the pam password configuration to see if password changes are handled correctly.
