Difference between revisions of "Client Authentication:Ubuntu"
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Revision as of 21:35, 11 May 2010
Ubuntu 9.10 Authentication
The following details the setup of Ubuntu 9.10 Karmic Koala as a desktop to authenticate users against SME 7.4 using Samba and Winbind. 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.
- Download the Ubuntu .iso and install.
- Complete install, login and apply all updates.
Use the 'System - Administration - Synaptic Package Manager' to install additional packages
auth-client-config winbind libpam-mount smbfs
Optionally, you can use the command line:
sudo aptitude install auth-client-config winbind libpam-mount smbfs
- Open an 'Applications - Accessories - Terminal' cli and change to root privileges
- 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.
- Replace <WORKGROUP> below with the 'Windows workgroup' name of your SME server. Replace <ip of sme server> below with the internal network ip address of your SME server.
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 users = yes winbind enum groups = yes winbind cache time = 10 winbind use default domain = yes
- To check validation of smb.conf, run
- 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>
- The following commands should now list users, groups and available shares respectively from the SME server
wbinfo -u wbinfo -g smbtree
- 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
- Create and edit a new file called acc-sme, and enter
[sme] nss_group=group: compat winbind nss_netgroup=netgroup: nis nss_passwd=passwd: compat winbind nss_shadow=shadow: compat 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_secure 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
- Open and edit pam_mount.conf.xml file. Find the 'Volume Definitions' section. Add a volume line below the header
<!-- Volume Definitions --> <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 using the VM. Perhaps someone could confirm its OK when on proper subnet.
Haven't tested the pam password configuration to see if password changes are handled correctly.
There is a bug in the version of Samba that ships with Ubuntu 9.10 (Karmic Koala) which causes an 'out of memory' error in winbindd. If you experience problems logging in, you can verify if this is the cause by searching for that phrase:
grep -i memory /var/log/samba/log.winbindd
A fix has been released in package samba-3.4.0-3ubuntu5.5, which will be packaged as part of Ubuntu 10.04 (Lucid Lynx). It is also available in the karmic-proposed repository.
WARNING: Enabling the karmic-proposed repository on a production machine could cause instability. It is recommended that, in addition to adding the repository to /etc/apt/sources.list, you also create a file named /etc/apt/preferences.d/karmic-proposed, with the following contents:
Package: * Pin: release a=karmic-security Pin-Priority: 990 Package: * Pin: release a=karmic-updates Pin-Priority: 900 Package: * Pin: release a=karmic-proposed Pin-Priority: 400
Use aptitude to select only the packages that you need and install them:
sudo aptitude install samba/karmic-proposed sudo aptitude install samba-common-bin/karmic-proposed