How to Integrate windows Active Directory and Samba in Ubuntu

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We have already dicussed how to add ubuntu machine in to windows Active Directory.In this tutorial we will see how Integrate windows Active Directory and Samba in Ubuntu.If you want to access samba shares from windows Active Directory.

Samba is an Open Source/Free Software suite that provides seamless file and print services to SMB/CIFS clients." Samba is freely available, unlike other SMB/CIFS implementations, and allows for interoperability between Linux/Unix servers and Windows-based clients.

Install samba and kerberos in Ubuntu

sudo aptitude install krb5-user

sudo aptitude install samba smbfs smbclient winbind

Configure samba

Now likewise-open and samba packages use separate secrets.tdb (samba password file) files,We need to create a symlink to be  /var/lib/samba

Take a backupof existing file

sudo mv /var/lib/samba/secrets.tdb /var/lib/samba/secrets.tdb.orig

Create a link to /var/lib/samba

sudo ln -s /etc/samba/secrets.tdb /var/lib/samba

Configuring samba and kerberos

Edit /etc/samba/smb.conf file

sudo vi /etc/samba/smb.conf

Note:- replace ug01 netbios name with your own

Change the following parameters

[global]
security = ads
netbios name = ug01
realm = DOMAIN.INTERNAL
password server = domainserver.domain.internal
workgroup = DOMAIN
idmap uid = 500-10000000
idmap gid = 500-10000000
winbind separator = +
winbind enum users = no
winbind enum groups = no
winbind use default domain = yes
template homedir = /home/%D/%U
template shell = /bin/bash
client use spnego = yes
domain master = no

Save and exit the file

Test the configuration with the testparm command

Kerberos Configuration

Edit the /etc/krb5.conf File

sudo vi /etc/krb5.conf

Change the following lines

[logging]
default = FILE10000:/var/log/krb5lib.log
[libdefaults]
ticket_lifetime = 24000
default_realm = DOMAIN.INTERNAL
default_tkt_enctypes = des3-hmac-sha1 des-cbc-crc
default_tgs_enctypes = des3-hmac-sha1 des-cbc-crc
[realms]
DOMAIN.INTERNAL = {
kdc = domainserver.domain.internal
admin_server = domainserver.domain.internal
default_domain = DOMAIN.INTERNAL

}

[domain_realm]
.domain.internal = DOMAIN.INTERNAL
domain.internal = DOMAIN.INTERNAL

Save and exit the file

Configuring nsswitch file

Edit /etc/nsswitch.conf to look like the example below

sudo vi /etc/nsswitch.conf

passwd:   compat winbind
group:   compat winbind
shadow:         compat
hosts:          files dns wins
networks:       files
protocols:      db files
services:       db files
ethers:         db files
rpc:            db files
netgroup:       nis

Save and exit the file

Modify the PAM settings

  • /etc/pam.d/common-account should contain only the following lines

account sufficient    pam_winbind.so
account required    pam_unix.so

  • /etc/pam.d/common-auth should contain only the following lines

auth    sufficient      pam_winbind.so
auth    required        pam_unix.so nullok_secure use_first_pass

  • Modify the /etc/pam.d/common-password file, so the max parameter is set to 50, similar to the one shown below

password   required   pam_unix.so nullok obscure min=4 max=50 md5

  • Make sure the /etc/pam.d/common-session file contains the following line

session required   pam_mkhomedir.so umask=0022 skel=/etc

Make a directory to hold domain user home directories

Note: Use the value you put in the WORKGROUP tag of the /etc/samba/smb.conf file

mkdir -p /home/DOMAIN

Initialize Kerberos

sudo kinit [email protected]

Note:- write $FQDN_OF_YOUR_DOMAIN in capitals as you did in your krb5.conf file.You can check you’ve obtained your ticket with klist

Next check to be sure you got a ticket from the domain controller

sudo klist

If you didn't add your ubuntu server to windows AD use the following command

net ads join -U Adminstrator@$FQDN_OF_YOUR_DOMAIN

Restart Samba-related Services (Or reboot the server)

Note: If you are stopping and starting services the order is important

sudo /etc/init.d/samba stop

sudo /etc/init.d/winbind stop

sudo /etc/init.d/samba start

sudo /etc/init.d/winbind start

Restart SSH and Test Connectivity

Note: If you rebooted the server in the previous step, just try and login.

sudo /etc/init.d/ssh restart

ssh useraccount@server

If you can login using your active directory username and password then everything is working fine.

Configure SUDO

First you need to create a group in Active Directory called UbuntuAdmins and add the names of people whom you want to be able to use sudo to admin the server.

Next, add the UbuntuAdmins group to the /etc/sudoers so these users can use sudo

%UbuntuAdmins ALL=(ALL) ALL

Useful Commands

List the derived UNIX GID values for Active Directory groups

for gid in $(wbinfo -r <username>); \
do SID=$(wbinfo -G $gid);GROUP=$(wbinfo -s $SID); echo $gid is $GROUP; done

See the Active Directory SID for a particular named user

wbinfo –n <username>

Reference from here

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20 thoughts on “How to Integrate windows Active Directory and Samba in Ubuntu

  1. Sorry to be obtuse but:

    For the smb.conf you say to change the parameters, but those do not seem to be in the default config. Is that the resulting config, i.e. the whole of smb.conf? I assume we also need to change the DOMAIN values to match our environment?

    Similar questions for the krb5.conf file.

    [Reply]

  2. Awesome.. I was looking for this nearly for an year now.. Let me give a try in a couple of days. Good Job, keep it up..!!!

    Cheers
    Ramesh

    [Reply]

  3. WOW, something i was searching for long… let me test it
    I hope it will work with Readhat LInux also

    Regards,
    Vinod

    [Reply]

  4. Thank you very much for sharing this.
    I’ve just followed this instruction to integrate Windows AD with Ubuntu (7.10) but failed.
    It won’t let me login after I reboot Ubuntu and always says “Login incorrect”.

    Any idea?

    Thanks again.

    [Reply]

  5. Hi,

    You said

    Take a backupof existing file

    sudo mv /var/lib/samba/secrets.tdb /var/lib/samba/secrets.tdb.orig

    Create a link to /var/lib/samba

    sudo ln -s /etc/samba/secrets.tdb /var/lib/samba

    Could it be possible that the command is “cp” instead of “mv” in the first sudo. Otherwise the next link won’t work either.

    Regards,

    Bernard Tremblay

    [Reply]

  6. This is great! It used to be so difficult to get this working in past releases; thanks for researching and showing the simple procedure that works!

    I did see one little problem: the “skel” directory is not specified correctly in /etc/pam.d/common-session; it should be:

    session required pam_mkhomedir.so umask=0022 skel=/etc/skel

    Otherwise, the newly created home directory is not populated correctly.

    [Reply]

  7. A little clarity may be in order here.

    As I see it since you only once say to change something you typed:

    Note:- replace ug01 netbios name with your own

    That indicates to me that everything else is entered verbatim. For example instead of entering my own domain information where you have DOMAIN.INTERNAL, I enter DOMAIN.INTERNAL.

    This seems wrong to me. I don’t honestly know how to proceed. It gets more maddening in krb5.conf because: 1. it seems to have been populated with my FQDN where you say I should enter DOMAIN.INTERNAL, 2. you’ve used DOMAIN.INTERNAL and domain.internal
    and 3. the some of the lines are only vaguely similar but enough so that I think they suffice for what you say to enter.

    So off I go looking for some other tutorial to compare with. I’m sure to be more confused by the end of all this.

    [Reply]

  8. To answer my question above, you do indeed need to use your local domain name where DOMAIN.INTERNAL is listed. But I can confirm that something after the krb5.conf edits above breaks login for me. I cp’d every file to a .orig file first so it was easy to revert.

    [Reply]

  9. I followed the procedure, rebooted the server.

    I try and log in as a user and get the message that my password will expire in 9 days (which is correct, my AD password is due to expire).
    I click on OK and then get a message: “Incorrect User name or password, letter must be typed in the correct case”
    and am back at login.

    But I did, AD authenticated, so why am I being blocked?

    [Reply]

  10. Hi Everyone,

    I picked up an issue when using Likewise-open and the above how-to to get my Samba shares to use ADS integration. It kept on prompting for a password and the ADS usernames did not work!

    I am currently running child domains on Server 2003 R2 platform. This changes the ADS schema and the ‘net ads join ….’ command does not allow you to join the domain.

    If you used Likewise-open to join the domain. Please use this tutorial:

    http://www.likewisesoftware.com/resources/user_documentation/Likewise-Samba-Guide.pdf

    You do not need to change the krb5.conf, nsswith.conf or the PAM authentication config files at all!

    I hope this saves someone from the late nights I went through to find it.

    Regards,

    Craig

    [Reply]

  11. # Ken Leja Says: Your comment is awaiting moderation.
    January 12th, 2009 at 6:00 am

    I was getting the following errors in auth.log and could not login as administrator without getting an error on login “User not known to the underlying authentication module”
    auth.log:
    Jan 11 22:33:44 myserver login[5180]: pam_winbind(login:auth): getting password (0×00000000)
    Jan 11 22:33:44 myserver login[5180]: pam_winbind(login:auth): user ‘ADMINISTRATOR’ granted access
    Jan 11 22:33:44 myserver login[5180]: pam_unix(login:account): could not identify user (from getpwnam(administrator))
    Jan 11 22:33:44 myserver login[5180]: User not known to the underlying authentication module

    This turned out to be an issue with nsswitch.conf so I tweaked it as follows after reading the following HOWTO http://localhost:901/swat/help/Samba3-HOWTO/FastStart.html in SWAT. Change the following lines as shown.

    nsswitch.conf:
    passwd: compat winbind
    group: compat winbind
    hosts: files dns wins winbind

    My appologies I pasted the wrong text in the previous post.

    [Reply]

  12. Thank You!!!, this guide is very simple and usefull, i was trying many days validate samba in W2k8, until found this guide

    [Reply]

  13. In the nsswitch.conf edits there’s a linebreak problem. Instead of

    passwd: compat
    winbindgroup: compat winbind

    It should read

    passwd: compat winbind
    group: compat winbind

    most of the login incorrect problems reported by the commenters are likely to be caused by this edit problem.

    [Reply]

    admin Reply:

    @Amanibhavam

    Thankyou i have corrected the problem

    [Reply]

  14. You can add

    obey pam restrictions = yes

    in smb.conf. If you use this, the home directory is created by pam when a user connect to his home directory shared with samba

    Sorry for my english.

    [Reply]

  15. Was trying to get likewise and samba to enable me to share folders to Windows from Ubuntu 12.04 It seems that Ubuntu is not supported (after 11.10)!

    Can you offer any suggestions?

    Thanks

    [Reply]

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