Kerberos - krb5 configuration file

1 - About

The krb5 (conf|ini) file contains Kerberos configuration information, including:

  • the locations of KDCs
  • the location of admin servers
  • defaults for the current realm
  • defaults for Kerberos applications,
  • mappings of hostnames onto Kerberos realms.

3 - Management

3.1 - Location

3.1.1 - Default

The default directory is:

  • /etc/krb5/krb5.conf on Solaris platforms.
  • /etc/krb5.conf on other Unix platforms.
  • C:\Windows\krb5.ini on Windows (May be also in “C:\ProgramData\MIT\Kerberos5\krb5.ini” after windows installation)

but you can specify an other one with the following java ommand lines the property parameter :

-Djava.security.krb5.conf=<path>/krb5.conf.

3.1.2 - KRB5_CONFIG

If set the KRB5_CONFIG environment variable gives the path of the config file.

3.2 - Parameters

4 - Reference

5 - Example

krb5.conf
[libdefaults]
	default_realm = PKRSRVP1J0T6UKX4.D3.INTERNAL.CLOUDAPP.NET
        renew_lifetime = 7d
        forwardable = true
       default_realm = GNU.ORG
       ticket_lifetime = 24h
       dns_lookup_realm = false
      dns_lookup_kdc = false
      udp_preference_limit = 1
     #default_tgs_enctypes = aes des3-cbc-sha1 rc4 des-cbc-md5
     #default_tkt_enctypes = aes des3-cbc-sha1 rc4 des-cbc-md5
 
 
# 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]
	ATHENA.MIT.EDU = {
		kdc = kerberos.mit.edu:88
		kdc = kerberos-1.mit.edu:88
		kdc = kerberos-2.mit.edu:88
		admin_server = kerberos.mit.edu
		default_domain = mit.edu
	}
	MEDIA-LAB.MIT.EDU = {
		kdc = kerberos.media.mit.edu
		admin_server = kerberos.media.mit.edu
	}
	ZONE.MIT.EDU = {
		kdc = casio.mit.edu
		kdc = seiko.mit.edu
		admin_server = casio.mit.edu
	}
	MOOF.MIT.EDU = {
		kdc = three-headed-dogcow.mit.edu:88
		kdc = three-headed-dogcow-1.mit.edu:88
		admin_server = three-headed-dogcow.mit.edu
	}
	CSAIL.MIT.EDU = {
		kdc = kerberos-1.csail.mit.edu
		kdc = kerberos-2.csail.mit.edu
		admin_server = kerberos.csail.mit.edu
		default_domain = csail.mit.edu
		krb524_server = krb524.csail.mit.edu
	}
	IHTFP.ORG = {
		kdc = kerberos.ihtfp.org
		admin_server = kerberos.ihtfp.org
	}
	GNU.ORG = {
		kdc = kerberos.gnu.org
		kdc = kerberos-2.gnu.org
		kdc = kerberos-3.gnu.org
		admin_server = kerberos.gnu.org
	}
	1TS.ORG = {
		kdc = kerberos.1ts.org
		admin_server = kerberos.1ts.org
	}
	GRATUITOUS.ORG = {
		kdc = kerberos.gratuitous.org
		admin_server = kerberos.gratuitous.org
	}
	DOOMCOM.ORG = {
		kdc = kerberos.doomcom.org
		admin_server = kerberos.doomcom.org
	}
	ANDREW.CMU.EDU = {
		kdc = kerberos.andrew.cmu.edu
		kdc = kerberos2.andrew.cmu.edu
		kdc = kerberos3.andrew.cmu.edu
		admin_server = kerberos.andrew.cmu.edu
		default_domain = andrew.cmu.edu
	}
	CS.CMU.EDU = {
		kdc = kerberos.cs.cmu.edu
		kdc = kerberos-2.srv.cs.cmu.edu
		admin_server = kerberos.cs.cmu.edu
	}
	DEMENTIA.ORG = {
		kdc = kerberos.dementix.org
		kdc = kerberos2.dementix.org
		admin_server = kerberos.dementix.org
	}
	stanford.edu = {
		kdc = krb5auth1.stanford.edu
		kdc = krb5auth2.stanford.edu
		kdc = krb5auth3.stanford.edu
		master_kdc = krb5auth1.stanford.edu
		admin_server = krb5-admin.stanford.edu
		default_domain = stanford.edu
	}
        UTORONTO.CA = {
                kdc = kerberos1.utoronto.ca
                kdc = kerberos2.utoronto.ca
                kdc = kerberos3.utoronto.ca
                admin_server = kerberos1.utoronto.ca
                default_domain = utoronto.ca
	}
 
[domain_realm]
	.mit.edu = ATHENA.MIT.EDU
	mit.edu = ATHENA.MIT.EDU
	.media.mit.edu = MEDIA-LAB.MIT.EDU
	media.mit.edu = MEDIA-LAB.MIT.EDU
	.csail.mit.edu = CSAIL.MIT.EDU
	csail.mit.edu = CSAIL.MIT.EDU
	.whoi.edu = ATHENA.MIT.EDU
	whoi.edu = ATHENA.MIT.EDU
	.stanford.edu = stanford.edu
	.slac.stanford.edu = SLAC.STANFORD.EDU
        .toronto.edu = UTORONTO.CA
        .utoronto.ca = UTORONTO.CA
 
[login]
	krb4_convert = true
	krb4_get_tickets = false
 
[logging]
default = FILE:/var/log/krb5kdc.log
admin_server = FILE:/var/log/kadmind.log
kdc = FILE:/var/log/krb5kdc.log
security/kerberos/krb5.txt · Last modified: 2018/07/26 10:07 by gerardnico