Kerberos

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This page details the Kerberos configuration at ProgClub. Check out Network administration for other network admin related material. See Single sign-on for other SSO related material. See Projects for other projects.

Project status

Complete! Charity is now configured as the KDC. We've even finished SSH integration, and other things for Single sign-on.

Contributors

Members who have contributed to this project. Newest on top.

All contributors have agreed to the terms of the Contributor License Agreement. This excludes any upstream contributors who tend to have different administrative frameworks.

Copyright

Copyright 2011, Contributors. Licensed under the New BSD license.

Links

TODO

Nothing to see here, it's all done!

Done

See Network administration and Charity admin.

DNS configuration

See Hostnames for the Master and Slave KDCs for information about configuring DNS for Kerberos. ProgClub's DNS configuration for Kerberos is as follows:

progclub.org

    $ORIGIN progclub.org.
    _kerberos               TXT       "PROGCLUB.ORG"
    kerberos                CNAME     charity
    _kerberos._udp          SRV       0 0 88 charity
    _kerberos-adm._tcp      SRV       0 0 749 charity
    _kpasswd._udp           SRV       0 0 464 charity

progclub.com

    $ORIGIN progclub.com.
    _kerberos               TXT       "PROGCLUB.ORG"
    kerberos                CNAME     charity
    _kerberos._udp          SRV       0 0 88 charity
    _kerberos-adm._tcp      SRV       0 0 749 charity
    _kpasswd._udp           SRV       0 0 464 charity

progclub.info

    $ORIGIN progclub.info.
    _kerberos               TXT       "PROGCLUB.ORG"
    kerberos                CNAME     charity
    _kerberos._udp          SRV       0 0 88 charity
    _kerberos-adm._tcp      SRV       0 0 749 charity
    _kpasswd._udp           SRV       0 0 464 charity

progclub.net

    $ORIGIN progclub.net.
    _kerberos               TXT       "PROGCLUB.ORG"
    kerberos                CNAME     charity
    _kerberos._udp          SRV       0 0 88 charity
    _kerberos-adm._tcp      SRV       0 0 749 charity
    _kpasswd._udp           SRV       0 0 464 charity

progclub.co

    $ORIGIN progclub.co.
    _kerberos               TXT       "PROGCLUB.ORG"
    kerberos                CNAME     charity
    _kerberos._udp          SRV       0 0 88 charity
    _kerberos-adm._tcp      SRV       0 0 749 charity
    _kpasswd._udp           SRV       0 0 464 charity

progclub.mobi

    $ORIGIN progclub.mobi.
    _kerberos               TXT       "PROGCLUB.ORG"
    kerberos                CNAME     charity
    _kerberos._udp          SRV       0 0 88 charity
    _kerberos-adm._tcp      SRV       0 0 749 charity
    _kpasswd._udp           SRV       0 0 464 charity

KDC configuration

The KDC (Key Distribution Centre) for ProgClub is charity.progclub.org, aliased as kerberos.progclub.*.

Configuration

root@charity:/etc# ll kr*
-rw-r--r-- 1 root root 1755 2011-08-05 02:36 krb5.conf

krb5kdc:
total 20
drwx------  2 root root 4096 2011-08-04 11:57 ./
drwxr-xr-x 78 root root 4096 2011-08-05 02:37 ../
-rw-r--r--  1 root root  353 2011-08-04 11:53 kadm5.acl
-rw-r--r--  1 root root  640 2011-08-04 11:49 kdc.conf
-rw-------  1 root root   65 2011-08-04 11:57 stash
root@charity:/etc# cat krb5.conf
[logging]
        default = FILE:/var/log/krb5.log

[libdefaults]
        default_realm = PROGCLUB.ORG

# The following krb5.conf variables are only for MIT Kerberos.
        krb4_config = /etc/krb.conf
        krb4_realms = /etc/krb.realms
        kdc_timesync = 1
        ccache_type = 4
        forwardable = true
        proxiable = true 

# The following encryption type specification will be used by MIT Kerberos
# if uncommented.  In general, the defaults in the MIT Kerberos code are
# correct and overriding these specifications only serves to disable new
# encryption types as they are added, creating interoperability problems.
#
# Thie only time when you might need to uncomment these lines and change
# the enctypes is if you have local software that will break on ticket
# caches containing ticket encryption types it doesn't know about (such as
# old versions of Sun Java). 

#       default_tgs_enctypes = des3-hmac-sha1
#       default_tkt_enctypes = des3-hmac-sha1
#       permitted_enctypes = des3-hmac-sha1 

# The following libdefaults parameters are only for Heimdal Kerberos.
        v4_instance_resolve = false
        v4_name_convert = {
                host = {
                        rcmd = host
                        ftp = ftp
                }
                plain = {
                        something = something-else
                }
        }
        fcc-mit-ticketflags = true

[realms]
        PROGCLUB.ORG = {
                kdc = kerberos.progclub.org:88
                admin_server = kerberos.progclub.org
                default_domain = progclub.org
        }

[domain_realm]
        .progclub.org = PROGCLUB.ORG
        progclub.org = PROGCLUB.ORG
        .progclub.com = PROGCLUB.ORG
        progclub.com = PROGCLUB.ORG
        .progclub.info = PROGCLUB.ORG
        progclub.info = PROGCLUB.ORG
        .progclub.net = PROGCLUB.ORG
        progclub.net = PROGCLUB.ORG
        .progclub.co = PROGCLUB.ORG
        progclub.co = PROGCLUB.ORG
        .progclub.mobi = PROGCLUB.ORG
        progclub.mobi = PROGCLUB.ORG

[login]
        krb4_convert = true
        krb4_get_tickets = false
root@charity:/etc# cat krb5kdc/kadm5.acl
# This file is the access control list for krb5 administration.
# When this file is edited run /etc/init.d/krb5-admin-server restart to activate
# One common way to set up Kerberos administration is to allow any principal
# ending in /admin  is given full administrative rights.
# To enable this, uncomment the following line:
*/admin@PROGCLUB.ORG    *
root@charity:/etc# cat krb5kdc/kdc.conf
[kdcdefaults]
    kdc_ports = 750,88
    default_realm = PROGCLUB.ORG

[realms]
    PROGCLUB.ORG = {
        database_name = /var/lib/krb5kdc/principal
        admin_keytab = FILE:/etc/krb5kdc/kadm5.keytab
        acl_file = /etc/krb5kdc/kadm5.acl
        key_stash_file = /etc/krb5kdc/stash
        kdc_ports = 750,88
        max_life = 10h 0m 0s
        max_renewable_life = 7d 0h 0m 0s
        master_key_type = des3-hmac-sha1
        supported_enctypes = aes256-cts:normal arcfour-hmac:normal des3-hmac-sha1:normal des-cbc-crc:normal des:normal des:v4 des:norealm des:onlyrealm des:afs3
        default_principal_flags = +preauth
    }

Database

root@charity:/etc# cd /var/lib/krb5kdc/
root@charity:/var/lib/krb5kdc# ll
total 24
drwx------  2 root root 4096 2011-08-04 11:57 ./
drwxr-xr-x 30 root root 4096 2011-08-04 11:37 ../
-rw-------  1 root root 8192 2011-08-05 02:55 principal
-rw-------  1 root root 8192 2011-08-04 11:57 principal.kadm5
-rw-------  1 root root    0 2011-08-04 11:57 principal.kadm5.lock
-rw-------  1 root root    0 2011-08-05 02:55 principal.ok

Keytab files

root@charity:/var/lib/krb5kdc# cd /etc
root@charity:/etc# find -name "*.keytab"
./apache2/apache2.keytab