Why do I get duplicate Kerberos service tickets with no realm?

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Under what circumstances will I obtain apparently-valid service tickets that are duplicates and that don't have an associated realm? That is, does this indicate a mis-configuration somewhere? Does it represent an interesting capability or opportunity? ... an inefficiency or a vulnerability?

For example, if I kinit successfully to obtain my TGT, SSH to a kerberized host, then run klist, I see this (sanitized) output:

Ticket cache: KCM:503

Default principal: neirbowj@EXAMPLE.COM



Valid starting       Expires              Service principal

01/24/2016 18:17:40  01/25/2016 04:17:40  krbtgt/EXAMPLE.COM@EXAMPLE.COM

    renew until 01/25/2016 18:17:33

01/24/2016 18:17:45  01/25/2016 04:17:40  host/foo.example.com@

    renew until 01/25/2016 18:17:33

01/24/2016 18:17:45  01/25/2016 04:17:40  host/foo.example.com@EXAMPLE.COM

    renew until 01/25/2016 18:17:33

What does it mean that I have both host/foo.example.com@ and host/foo.example.com@EXAMPLE.COM service tickets?

I'm running OS X Yosemite 10.10.5 and using the kerberos5 1.13.2_2 port and the openssh 7.1p2_0+kerberos5+ldns+xauth port from MacPorts 2.3.4. My (sanitized) /etc/krb5.conf has:

[libdefaults]

    default_realm = EXAMPLE.COM

[realms]

    EXAMPLE.COM = {

        admin_server = kerberos.example.com

    }

asked Jan 24 '16 at 23:26

neirbowj

279139

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1
down vote

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For example, if I kinit successfully to obtain my TGT, SSH to a kerberized host, then run klist, I see this (sanitized) output:

Ticket cache: KCM:503

Default principal: neirbowj@EXAMPLE.COM



Valid starting       Expires              Service principal

01/24/2016 18:17:40  01/25/2016 04:17:40  krbtgt/EXAMPLE.COM@EXAMPLE.COM

    renew until 01/25/2016 18:17:33

01/24/2016 18:17:45  01/25/2016 04:17:40  host/foo.example.com@

    renew until 01/25/2016 18:17:33

01/24/2016 18:17:45  01/25/2016 04:17:40  host/foo.example.com@EXAMPLE.COM

    renew until 01/25/2016 18:17:33

What does it mean that I have both host/foo.example.com@ and host/foo.example.com@EXAMPLE.COM service tickets?

I'm running OS X Yosemite 10.10.5 and using the kerberos5 1.13.2_2 port and the openssh 7.1p2_0+kerberos5+ldns+xauth port from MacPorts 2.3.4. My (sanitized) /etc/krb5.conf has:

[libdefaults]

    default_realm = EXAMPLE.COM

[realms]

    EXAMPLE.COM = {

        admin_server = kerberos.example.com

    }

asked Jan 24 '16 at 23:26

neirbowj

279139

add a comment |

up vote
1
down vote

favorite

For example, if I kinit successfully to obtain my TGT, SSH to a kerberized host, then run klist, I see this (sanitized) output:

Ticket cache: KCM:503

Default principal: neirbowj@EXAMPLE.COM



Valid starting       Expires              Service principal

01/24/2016 18:17:40  01/25/2016 04:17:40  krbtgt/EXAMPLE.COM@EXAMPLE.COM

    renew until 01/25/2016 18:17:33

01/24/2016 18:17:45  01/25/2016 04:17:40  host/foo.example.com@

    renew until 01/25/2016 18:17:33

01/24/2016 18:17:45  01/25/2016 04:17:40  host/foo.example.com@EXAMPLE.COM

    renew until 01/25/2016 18:17:33

What does it mean that I have both host/foo.example.com@ and host/foo.example.com@EXAMPLE.COM service tickets?

I'm running OS X Yosemite 10.10.5 and using the kerberos5 1.13.2_2 port and the openssh 7.1p2_0+kerberos5+ldns+xauth port from MacPorts 2.3.4. My (sanitized) /etc/krb5.conf has:

[libdefaults]

    default_realm = EXAMPLE.COM

[realms]

    EXAMPLE.COM = {

        admin_server = kerberos.example.com

    }

asked Jan 24 '16 at 23:26

neirbowj

279139

For example, if I kinit successfully to obtain my TGT, SSH to a kerberized host, then run klist, I see this (sanitized) output:

Ticket cache: KCM:503

Default principal: neirbowj@EXAMPLE.COM



Valid starting       Expires              Service principal

01/24/2016 18:17:40  01/25/2016 04:17:40  krbtgt/EXAMPLE.COM@EXAMPLE.COM

    renew until 01/25/2016 18:17:33

01/24/2016 18:17:45  01/25/2016 04:17:40  host/foo.example.com@

    renew until 01/25/2016 18:17:33

01/24/2016 18:17:45  01/25/2016 04:17:40  host/foo.example.com@EXAMPLE.COM

    renew until 01/25/2016 18:17:33

What does it mean that I have both host/foo.example.com@ and host/foo.example.com@EXAMPLE.COM service tickets?

I'm running OS X Yosemite 10.10.5 and using the kerberos5 1.13.2_2 port and the openssh 7.1p2_0+kerberos5+ldns+xauth port from MacPorts 2.3.4. My (sanitized) /etc/krb5.conf has:

[libdefaults]

    default_realm = EXAMPLE.COM

[realms]

    EXAMPLE.COM = {

        admin_server = kerberos.example.com

    }

ssh macports kerberos

asked Jan 24 '16 at 23:26

neirbowj

279139

asked Jan 24 '16 at 23:26

neirbowj

279139

asked Jan 24 '16 at 23:26

neirbowj

279139

asked Jan 24 '16 at 23:26

neirbowj

279139

asked Jan 24 '16 at 23:26

neirbowj

279139

add a comment |

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