Ubuntu 19.04
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OpenLDAP : Configure LDAP Client (AD)
2019/04/25
 
Configure LDAP Client for the case LDAP Server is Windows Active Directory.
[1]
[2] Install OpenLDAP Client.
root@www:~#
apt -y install libnss-ldap libpam-ldap ldap-utils
(1) specify AD server's URI

 +---------------------| Configuring ldap-auth-config |----------------------+
 | Please enter the URI of the LDAP server to use. This is a string in the   |
 | form of ldap://<hostname or IP>:<port>/. ldaps:// or ldapi:// can also    |
 | be used. The port number is optional.                                     |
 |                                                                           |
 | Note: It is usually a good idea to use an IP address because it reduces   |
 | risks of failure in the event name service problems.                      |
 |                                                                           |
 | LDAP server Uniform Resource Identifier:                                  |
 |                                                                           |
 | ldap://fd3s.srv.world/_________________________________________________    |
 |                                                                           |
 |                                  <Ok>                                     |
 |                                                                           |
 +---------------------------------------------------------------------------+

(2) specify suffix

 +---------------------| Configuring ldap-auth-config |----------------------+
 | Please enter the distinguished name of the LDAP search base. Many sites   |
 | use the components of their domain names for this purpose. For example,   |
 | the domain "example.net" would use "dc=example,dc=net" as the             |
 | distinguished name of the search base.                                    |
 |                                                                           |
 | Distinguished name of the search base:                                    |
 |                                                                           |
 | dc=srv,dc=world_______________________________________________________    |
 |                                                                           |
 |                                  <Ok>                                     |
 |                                                                           |
 +---------------------------------------------------------------------------+

(3) specify LDAP version (generally OK to select Version [3])

  +---------------------| Configuring ldap-auth-config |---------------------+
  | Please enter which version of the LDAP protocol should be used by        |
  | ldapns. It is usually a good idea to set this to the highest available   |
  | version.                                                                 |
  |                                                                          |
  | LDAP version to use:                                                     |
  |                                                                          |
  |                                    3                                     |
  |                                    2                                     |
  |                                                                          |
  |                                                                          |
  |                                  <Ok>                                    |
  |                                                                          |
  +--------------------------------------------------------------------------+

(4) select the one you like. (this example selects [Yes])

 +---------------------| Configuring ldap-auth-config |----------------------+
 |                                                                           |
 | This option will allow you to make password utilities that use pam to     |
 | behave like you would be changing local passwords.                        |
 |                                                                           |
 | The password will be stored in a separate file which will be made         |
 | readable to root only.                                                    |
 |                                                                           |
 | If you are using NFS mounted /etc or any other custom setup, you should   |
 | disable this.                                                             |
 |                                                                           |
 | Make local root Database admin:                                           |
 |                                                                           |
 |                    <Yes>                       <No>                       |
 |                                                                           |
 +---------------------------------------------------------------------------+

(5) select the one you like. (this example selects [No])

    +-------------------| Configuring ldap-auth-config |-------------------+
    |                                                                      |
    | Choose this option if you are required to login to the database to   |
    | retrieve entries.                                                    |
    |                                                                      |
    | Note: Under a normal setup, this is not needed.                      |
    |                                                                      |
    | Does the LDAP database require login?                                |
    |                                                                      |
    |                   <Yes>                      <No>                    |
    |                                                                      |
    +----------------------------------------------------------------------+

(6) proceed next without any change because this parameter is not required (disable it later)

          +-------------| Configuring ldap-auth-config |-------------+
          | This account will be used when root changes a password.  |
          |                                                          |
          | Note: This account has to be a privileged account.       |
          |                                                          |
          | LDAP account for root:                                   |
          |                                                          |
          | cn=admin,dc=srv,dc=world_____________________________    |
          |                                                          |
          |                          <Ok>                            |
          |                                                          |
          +----------------------------------------------------------+

(7) inpu any (because this parameter is not required)

 +---------------------| Configuring ldap-auth-config |----------------------+
 | Please enter the password to use when ldap-auth-config tries to login to  |
 | the LDAP directory using the LDAP account for root.                       |
 |                                                                           |
 | The password will be stored in a separate file /etc/ldap.secret which     |
 | will be made readable to root only.                                       |
 |                                                                           |
 | Entering an empty password will re-use the old password.                  |
 |                                                                           |
 | LDAP root account password:                                               |
 |                                                                           |
 | _________________________________________________________________________ |
 |                                                                           |
 |                                  <Ok>                                     |
 |                                                                           |
 +---------------------------------------------------------------------------+

root@www:~#
vi /etc/nsswitch.conf
# line 7: add

passwd:         compat systemd ldap
group:          compat systemd ldap
shadow:         compat

root@www:~#
vi /etc/pam.d/common-password
# line 26: change ( remove [use_authtok] )

password        [success=1 user_unknown=ignore default=die]     pam_ldap.so try_first_pass

root@www:~#
vi /etc/pam.d/common-session
# add to the end if need (create home directory automatically at initial login)

session optional        pam_mkhomedir.so skel=/etc/skel umask=077
root@www:~#
vi /etc/ldap.conf
# line 43: uncomment and add a user's Suffix (the user is for connection user of AD and Linux, you added in [1] section)

binddn cn=ldapusers,cn=Users,dc=srv,dc=world
# line 47: uncomment and add the password of a user above

bindpw password
# line 52: comment out

#
rootbinddn cn=manager,dc=example,dc=com
# line 223-232: uncomment all

# RFC 2307 (AD) mappings
nss_map_objectclass posixAccount user
nss_map_objectclass shadowAccount user
nss_map_attribute uid sAMAccountName
nss_map_attribute homeDirectory unixHomeDirectory
nss_map_attribute shadowLastChange pwdLastSet
nss_map_objectclass posixGroup group
nss_map_attribute uniqueMember member
pam_login_attribute sAMAccountName
pam_filter objectclass=User
pam_password ad

root@www:~#
# verify with an user you added in [1] section on AD

root@www:~#
id Redstone

uid=5002(Redstone) gid=100(users) groups=100(users)
# authenticate to localhost with AD user

root@www:~#
ssh Redstone@localhost

The authenticity of host 'localhost (::1)' can't be established.
ECDSA key fingerprint is SHA256:84c3JIdg+sQLmqD4DZDcNtKU74qfpRuxOXzE9Efgf2g.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added 'localhost' (ECDSA) to the list of known hosts.
Redstone@localhost's password:
Creating directory '/home/Redstone'.
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Redstone@www:~$
Redstone@www:~$ id 
uid=5002(Redstone) gid=100(users) groups=100(users)
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