Hi everyone,
I'm just starting using MIT KRB by working through this book:
http://www.kerberos-buch.de/
I launched two virtual machines on my host to test setting up Kerberos
before installing and using it on the production machine. The machines
both are installed with Debian GNU/Linux 7.7 (wheezy), which comes with
Kerberos 1.10.1(+dfsg-5+deb7u2).
The machine dedicated for becoming the KDC uses IP 10.0.2.50 and has
assigned the DNS deb-krb.example.com (in /etc/hosts of all VMs).
The machine dedicated to be a KRB Client uses IP 10.0.2.51 and has
assigned the DNS deb-cl1.example.com.
There is no Firewall involved on any machine; a port scan using nmap,
from the client to the kdc shows that all necessary ports are open:
root@deb-cl1:~# nmap deb-krb
Starting Nmap 6.00 ( http://nmap.org ) at 2014-12-16 09:26 CET
Nmap scan report for deb-krb (10.0.2.50)
Host is up (0.00014s latency).
Not shown: 993 closed ports
PORT STATE SERVICE
22/tcp open ssh
88/tcp open kerberos-sec
111/tcp open rpcbind
389/tcp open ldap
464/tcp open kpasswd5
636/tcp open ldapssl
749/tcp open kerberos-adm
MAC Address: 08:00:27:84:40:71 (Cadmus Computer Systems)
Nmap done: 1 IP address (1 host up) scanned in 0.21 seconds
root@deb-cl1:~#
When I try to issue a ticket from the client, this works:
root@deb-cl1:~# klist
klist: No credentials cache found (ticket cache FILE:/tmp/krb5cc_0)
root@deb-cl1:~# kinit
user/ad...@example.com
Password for user/ad...@example.com:
root@deb-cl1:~# klist
Ticket cache: FILE:/tmp/krb5cc_0
Default principal: user/ad...@example.com
Valid starting Expires Service principal
16/12/2014 09:31 16/12/2014 19:31 krbtgt/example....@example.com
renew until 17/12/2014 09:31
root@deb-cl1:~#
When I try to use kadmin.local on the KDC, everything is OK, no matter
what I'm trying, it works. Here is an example:
root@deb-krb:/etc# kadmin.local -m -p user/ad...@example.com
Authenticating as principal user/ad...@example.com with password.
Enter KDC database master key:
kadmin.local: get_policy admin
Policy: admin
Maximum password life: 3153600000
Minimum password life: 864000
Minimum password length: 12
Minimum number of password character classes: 3
Number of old keys kept: 10
Reference count: 0
Maximum password failures before lockout: 0
Password failure count reset interval: 0 days 00:00:00
Password lockout duration: 0 days 00:00:00
kadmin.local: quit
root@deb-krb:/etc#
When I try to use kadmin on the KDC or the client, I get strange errors:
root@deb-krb:/etc# kadmin -m -p user/ad...@example.com
Authenticating as principal user/ad...@example.com with password.
Password for user/ad...@example.com:
kadmin: get_policy admin
get_policy: Communication failure with server while retrieving policy
"admin".
kadmin: addpol -maxlife 36500days -minlife 10days -minlength 8
-minclasses 3 -history 10 default
add_policy: Communication failure with server while creating policy
"default".
kadmin: quit
root@deb-krb:/etc#
In /etc/krb5kdc/kadm5.acl, */ad...@example.com is set as full
administration mask:
*/admin *
krb...@example.com *
*/ad...@example.com *
*/*@EXAMPLE.COM i
*@EXAMPLE.COM i
admin_server - Logfile contains the following on this:
Dec 16 10:14:06 deb-krb kadmind[3058](Notice): Request: kadm5_init,
user/ad...@example.com, success, client=user/ad...@example.com,
service=kadmin/deb-...@example.com, addr=10.0.2.50, vers=3, flavor=6
Dec 16 10:14:12 deb-krb kadmind[3058](Notice): Request:
kadm5_get_policy, admin, success, client=user/ad...@example.com,
service=kadmin/deb-...@example.com, addr=10.0.2.50
Dec 16 10:14:12 deb-krb kadmind[3058](Error): WARNING! Unable to send
function results, continuing.
I do not want to make this mail longer as needed - so please find the
following files as attachments instead of inline text:
/etc/krb5.conf
/etc/krb5kdc/kdc.conf
Does anyone have an idea why an administrative principal cannot issue
those commands using kadmin ?
Thanks for your help in advance!
Best regards,
Marc
[libdefaults]
default_realm = EXAMPLE.COM
# 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]
EXAMPLE.COM = {
kdc = deb-krb.example.com
admin_server = deb-krb.example.com
}
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
example.com = EXAMPLE.COM
.example.com = EXAMPLE.COM
[login]
krb4_convert = true
krb4_get_tickets = false
[kdcdefaults]
#kdc_ports = 750,88
kdc_ports = 88
kdc_tcp_ports = 88
[realms]
EXAMPLE.COM = {
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
master_key_type = aes256-cts
#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
supported_enctypes = aes256-cts:normal arcfour-hmac:normal
des3-hmac-sha1:normal
default_principal_flags = +preauth
}
[logging]
kdc = FILE:/var/log/kdc.log
admin_server = FILE:/var/log/krb_admin_server.log
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