Fedora 26
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Kerberos Authentication
2017/07/25
 
Enable Kerberos Authentication to limit access on specific web pages. Users can authenticate via Windows Active Directory.
It's necessarry to be running Windows Active Directory in your LAN.
This example based on the environment below.
Domain server : Windows Server 2016
Domain Name : FD3S01
Realm : SRV.WORLD
Hostname : fd3s.srv.world
[1]
Configure SSL Settings first, refer to here.
[2] For example, set Kerberos Authentication under the directory [/var/www/html/auth-kerberos].
[root@www ~]#
dnf -y install mod_auth_kerb
[root@www ~]#
vi /etc/krb5.conf
# line 16: uncomment and change to the Realm name

default_realm =
SRV.WORLD
# add follows under the [realms] section

[realms]
 SRV.WORLD = {
  kdc = fd3s.srv.world
  admin_server = fd3s.srv.world
 }
# add follows under the [domain_realm] section

[domain_realm]
 .fd3s.srv.world = SRV.WORLD
 fd3s.srv.world = SRV.WORLD
# create keytab HTTP/[AD's hostname or IP address]@[Realm name]

[root@www ~]#
echo "HTTP/fd3s.srv.world@SRV.WORLD" > /etc/httpd/conf.d/krb5.keytab
[root@www ~]#
vi /etc/httpd/conf.d/auth_kerberos.conf
# create new

<Directory /var/www/html/auth-kerberos>
    SSLRequireSSL
    AuthType Kerberos
    AuthName "Kerberos Authentication"
    KrbAuthRealms SRV.WORLD
    Krb5Keytab /etc/httpd/conf.d/krb5.keytab
    KrbMethodNegotiate Off
    KrbSaveCredentials Off
    KrbVerifyKDC Off
    Require valid-user
</Directory>
# create a test page

[root@www ~]#
mkdir /var/www/html/auth-kerberos

[root@www ~]#
vi /var/www/html/auth-kerberos/index.html 
<html>
<body>
<div style="width: 100%; font-size: 40px; font-weight: bold; text-align: center;">
Test Page for Kerberos Auth
</div>
</body>
</html>
[root@www ~]#
systemctl restart httpd
[3] Access to the test page from a client computer with a web browser. Then authentication is required like follows as a setting, answer with a user which is added in Active Directory.
[4] Just accessed.
 
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