What's wrong with my nagios kdc configuration?

elbarna

7/2/24, 12:33 AM

I want to setup a service to check the kdc with nagios. With my kdc (samba4) I create the user using this script

#!/bin/bash

USER=nagioskerberos
DOMAIN=myhost.priv
SERVICE=nagioskerberos
FQDN=nagios1.myhost.priv

samba-tool user delete $USER
samba-tool user create $USER --random-password
samba-tool user setexpiry $USER --noexpiry
net ads enctypes set $USER 16
samba-tool spn add $SERVICE/$FQDN $USER
samba-tool domain exportkeytab $USER.keytab --principal=$SERVICE/$FQDN

then I copy the keytab on nagios server and restart service

scp nagioskerberos.keytab nagios1:
ssh nagios1
systemctl restart nagios

the permissions are ok

ls -lhd /etc/nagios/nagios.*tab
-rw------- 1 nagios nagios 101 Jul  2 02:25 /etc/nagios/nagios.keytab

the keys seems ok

klist -ke /etc/nagios/nagios.keytab 
Keytab name: FILE:/etc/nagios/nagios.keytab
KVNO Principal
---- ---------------------------------------------
   2 nagioskerberos/[email protected] (aes256-cts-hmac-sha1-96)

But when I try to check...

./check_kdc -k /etc/nagios/nagios.keytab  -p nagioskerberos/[email protected] -H samba4 -P 88
CRITICAL Getting Kerberos ticket: kinit: Client 'nagioskerberos/[email protected]' not found in Kerberos database while getting initial credentials (credentials for nagioskerberos/[email protected] from /etc/nagios/nagios.keytab)

Why?

This is the krb5.conf for server samba4 and server nagios

[libdefaults]
    default_realm = MYHOST.PRIV
    dns_lookup_realm = true
    dns_lookup_kdc = true
    default_tgs_enctypes = aes256-cts-hmac-sha1-96 aes128-cts-hmac-sha1-96
    default_tkt_enctypes = aes256-cts-hmac-sha1-96 aes128-cts-hmac-sha1-96
    permitted_encryptes = aes256-cts-hmac-sha1-96 aes128-cts-hmac-sha1-96

1 + 0

kerberos

nagios

Score:0

Server

elbarna

7/2/24, 12:49 AM

Solution found.

First I change my script

from

net ads enctypes set $USER 16

net ads enctypes set $USER 24

I recreate the user.

BEFORE export the tab and copy I did this

samba-tool user edit nagioskerberos

modify this line

userPrincipalName: nagioskerberos/[email protected]

exit..

Copy the keytab, restart nagios and...

./check_kdc -k /etc/nagios/nagios.keytab -p nagioskerberos/[email protected] -H samba4 -P 88
OK

+ 0

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EN: What's wrong with my nagios kdc configuration?

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