Ubuntu 18.04
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FreeIPA : Configure FreeIPA Server2018/11/27

Configure FreeIPA Server to share users' account in your local network.
[1] Install FreeIPA.
apt -y install freeipa-server freeipa-server-dns

   # specify Realm
                      Configuring Kerberos Authentication
   When users attempt to use Kerberos and specify a principal or user name
   without specifying what administrative Kerberos realm that principal
   belongs to, the system appends the default realm.  The default realm may
   also be used as the realm of a Kerberos service running on the local
   machine.  Often, the default realm is the uppercase version of the local
   DNS domain.

   Default Kerberos version 5 realm:



    # specify FreeIPA server's hostname
                      Configuring Kerberos Authentication
    Enter the hostnames of Kerberos servers in the IPA.SRV.WORLD Kerberos
    realm separated by spaces.

    Kerberos servers for your realm:



   # specify FreeIPA server's hostname
                      Configuring Kerberos Authentication
   Enter the hostname of the administrative (password changing) server for
   the IPA.SRV.WORLD Kerberos realm.

   Administrative server for your Kerberos realm:


[2] Setup FreeIPA. This example shows to setup FreeIPA integrated DNS, too.
# add hostname to hosts

echo ' dlp.ipa.srv.world dlp' >> /etc/hosts
# initialize KDC DB

kdb5_util create -s -r IPA.SRV.WORLD

Loading random data
Initializing database '/var/lib/krb5kdc/principal' for realm 'IPA.SRV.WORLD',
master key name 'K/M@IPA.SRV.WORLD'
# set any DB password
You will be prompted for the database Master Password.
It is important that you NOT FORGET this password.
Enter KDC database master key:
Re-enter KDC database master key to verify:

ipa-server-install --setup-dns

The log file for this installation can be found in /var/log/ipaserver-install.log
This program will set up the FreeIPA Server.

This includes:
  * Configure a stand-alone CA (dogtag) for certificate management
  * Configure the Network Time Daemon (ntpd)
  * Create and configure an instance of Directory Server
  * Create and configure a Kerberos Key Distribution Center (KDC)
  * Configure Apache (httpd)
  * Configure DNS (bind)
  * Configure the KDC to enable PKINIT

To accept the default shown in brackets, press the Enter key.

WARNING: conflicting time&date synchronization service 'chronyd' will be disabled
in favor of ntpd

Enter the fully qualified domain name of the computer
on which you're setting up server software. Using the form
Example: master.example.com.

# confirm the hostname and Enter
Server host name [dlp.ipa.srv.world]:

Warning: skipping DNS resolution of host dlp.ipa.srv.world
The domain name has been determined based on the host name.

# confirm the domain name and Enter
Please confirm the domain name [ipa.srv.world]:

The kerberos protocol requires a Realm name to be defined.
This is typically the domain name converted to uppercase.

# confirm the realm name and Enter
Please provide a realm name [IPA.SRV.WORLD]:
Certain directory server operations require an administrative user.
This user is referred to as the Directory Manager and has full access
to the Directory for system management tasks and will be added to the
instance of directory server created for IPA.
The password must be at least 8 characters long.

# set Directory Manager's password
Directory Manager password:
Password (confirm):

The IPA server requires an administrative user, named 'admin'.
This user is a regular system account used for IPA server administration.

# set IPA admin's password
IPA admin password:
Password (confirm):

Checking DNS domain ipa.srv.world., please wait ...
# if you set DNS fowarder, answer [yes]
Do you want to configure DNS forwarders? [yes]: no
No DNS forwarders configured
# if you search reverse zone, answer [yes]
Do you want to search for missing reverse zones? [yes]: yes

The IPA Master Server will be configured with:
Hostname:       dlp.ipa.srv.world
IP address(es):
Domain name:    ipa.srv.world
Realm name:     IPA.SRV.WORLD

The CA will be configured with:
Subject DN:   CN=Certificate Authority,O=IPA.SRV.WORLD
Subject base: O=IPA.SRV.WORLD
Chaining:     self-signed

BIND DNS server will be configured to serve IPA domain with:
Forwarders:       No forwarders
Forward policy:   only
Reverse zone(s):  No reverse zone

# confirm settings and proceed with [yes]
Continue to configure the system with these values? [no]: yes

The following operations may take some minutes to complete.
Please wait until the prompt is returned.

Configuring NTP daemon (ntpd)
Setup complete

Next steps:
        1. You must make sure these network ports are open:
                TCP Ports:
                  * 80, 443: HTTP/HTTPS
                  * 389, 636: LDAP/LDAPS
                  * 88, 464: kerberos
                  * 53: bind
                UDP Ports:
                  * 88, 464: kerberos
                  * 53: bind
                  * 123: ntp

        2. You can now obtain a kerberos ticket using the command: 'kinit admin'
           This ticket will allow you to use the IPA tools (e.g., ipa user-add)
           and the web user interface.

Be sure to back up the CA certificates stored in /root/cacert.p12
These files are required to create replicas. The password for these
files is the Directory Manager password

chmod 755 /var/lib/krb5kdc

touch /var/log/kadmind.log /etc/krb5kdc/kadm5.acl

systemctl restart krb5-admin-server

[3] Get Kerberos ticket and change default shell to Bash.
kinit admin

Password for admin@IPA.SRV.WORLD:    
# IPA admin password


Ticket cache: KEYRING:persistent:0:0
Default principal: admin@IPA.SRV.WORLD

Valid starting       Expires              Service principal
11/26/2018 14:06:33  11/27/2018 14:06:31  krbtgt/IPA.SRV.WORLD@IPA.SRV.WORLD

ipa config-mod --defaultshell=/bin/bash

  Maximum username length: 32
  Home directory base: /home
  Default shell: /bin/bash
  Default users group: ipausers
  Default e-mail domain: ipa.srv.world
  Search time limit: 2
  Search size limit: 100
  User search fields: uid,givenname,sn,telephonenumber,ou,title
  Group search fields: cn,description
  Enable migration mode: FALSE
  Certificate Subject base: O=IPA.SRV.WORLD
  Password Expiration Notification (days): 4
  Password plugin features: AllowNThash, KDC:Disable Last Success
  SELinux user map order: guest_u:s0$xguest_u:s0$user_u:s0$staff_u:s0-s0:c0.c1023$unconfined_u:s0-s0:c0.c1023
  Default SELinux user: unconfined_u:s0-s0:c0.c1023
  Default PAC types: MS-PAC, nfs:NONE
  IPA masters: dlp.ipa.srv.world
  IPA CA servers: dlp.ipa.srv.world
  IPA CA renewal master: dlp.ipa.srv.world
  IPA master capable of PKINIT: dlp.ipa.srv.world
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