[30029] in Kerberos
Re: Question about dns_lookup_realm and domain_realm
daemon@ATHENA.MIT.EDU (Jeffrey Altman)
Fri Jun 27 00:52:42 2008
X-Envelope-From: jaltman@secure-endpoints.com
X-MDaemon-Deliver-To: kerberos@mit.edu
Message-ID: <48647221.8010103@secure-endpoints.com>
Date: Fri, 27 Jun 2008 00:52:49 -0400
From: Jeffrey Altman <jaltman@secure-endpoints.com>
MIME-Version: 1.0
To: jos@catnook.com
In-Reply-To: <20080627030434.GA7120@lizzy.catnook.local>
Cc: kerberos@mit.edu
Reply-To: jaltman@secure-endpoints.com
Content-Type: multipart/mixed; boundary="===============0080749445=="
Errors-To: kerberos-bounces@mit.edu
This is a cryptographically signed message in MIME format.
--===============0080749445==
Content-Type: multipart/signed; protocol="application/x-pkcs7-signature";
micalg=sha1; boundary="------------ms020408030808030409030809"
This is a cryptographically signed message in MIME format.
--------------ms020408030808030409030809
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Jos Backus wrote:
> (I know, following up on myself...)
>
> http://web.mit.edu/kerberos/www/krb5-1.6/krb5-1.6.3/doc/krb5-admin.html#Using-DNS says:
>
> "The second mechanism works by looking up the information in special TXT
> records in the Domain Name Service. This is currently not used by default
> because security holes could result if the DNS TXT records were spoofed. If
> this mechanism is enabled on the client, it will try to look up a TXT record
> for the DNS name formed by putting the prefix _kerberos in front of the
> hostname in question."
>
> (Fwiw, 1.5.4 has similar verbiage.) The dns_lookup_realm libdefaults option
> supposedly enables this mechanism on the client. The doc for it says:
>
> "Indicate whether DNS TXT records should be used to determine the Kerberos
> realm of a host."
>
> However, this doesn't actually work (at least in krb5 1.6.1, and likely other
> MIT versions as well), so either the docs are incorrect or there's a bug.
>
This behavior was most likely broken when the referrals code was added.
--------------ms020408030808030409030809
Content-Type: application/x-pkcs7-signature; name="smime.p7s"
Content-Transfer-Encoding: base64
Content-Disposition: attachment; filename="smime.p7s"
Content-Description: S/MIME Cryptographic Signature
MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIJeTCC
AxcwggKAoAMCAQICEDsE+kRcmomW1hYG6BoqhGEwDQYJKoZIhvcNAQEFBQAwYjELMAkGA1UE
BhMCWkExJTAjBgNVBAoTHFRoYXd0ZSBDb25zdWx0aW5nIChQdHkpIEx0ZC4xLDAqBgNVBAMT
I1RoYXd0ZSBQZXJzb25hbCBGcmVlbWFpbCBJc3N1aW5nIENBMB4XDTA4MDUzMDE5MTUyOVoX
DTA5MDUzMDE5MTUyOVowczEPMA0GA1UEBBMGQWx0bWFuMRUwEwYDVQQqEwxKZWZmcmV5IEVy
aWMxHDAaBgNVBAMTE0plZmZyZXkgRXJpYyBBbHRtYW4xKzApBgkqhkiG9w0BCQEWHGphbHRt
YW5Ac2VjdXJlLWVuZHBvaW50cy5jb20wggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIB
AQCtf5bVJdYFtHIrV2XALpA5oaMu7FPYU7RP7vJhd8Cu9Kd9ud2crX2pHK4avuPaYb4Vg9qI
zPrPadePhJ3OWwNt1ZlUlpc5URnOfpg/I9iymZBUSnCFVLuIvoncacqyUlzqdYEF8XGEoEL6
6bj8uoCSX0D7ZjZiAS8993NvgiPYpf10acMyWQ4max+P7Wg9T03Nw2F6EsmP6gWxBRsekTXe
N6QjJdvaK0846lDqeBFoCEzIUMQXj2kiXVPCPEdxPc/L1sDMYf0GLaDIg8qyThpGd0X6DwfK
3RWcMy8DV7Q5Z+jSEdPn5X0l4anOTrjr3IwE57MC3bVs0EEpUODTzftnAgMBAAGjOTA3MCcG
A1UdEQQgMB6BHGphbHRtYW5Ac2VjdXJlLWVuZHBvaW50cy5jb20wDAYDVR0TAQH/BAIwADAN
BgkqhkiG9w0BAQUFAAOBgQA9kndmeLrdQOUbhNGGms/FnfDyraH4OjA4PIIMOCbGWK0YXczs
/Fqn4XkT70SG4s8v4Zg6TaAcJrZBVcZQXyzrhlF2Zev/g69zZMHQe+2r4i/3FBVKAtFCoea1
vgwJ5TfZYlKvt4D0Z4zexu9Y0VwCIR4plWjVD76zC2CGB/2fhjCCAxcwggKAoAMCAQICEDsE
+kRcmomW1hYG6BoqhGEwDQYJKoZIhvcNAQEFBQAwYjELMAkGA1UEBhMCWkExJTAjBgNVBAoT
HFRoYXd0ZSBDb25zdWx0aW5nIChQdHkpIEx0ZC4xLDAqBgNVBAMTI1RoYXd0ZSBQZXJzb25h
bCBGcmVlbWFpbCBJc3N1aW5nIENBMB4XDTA4MDUzMDE5MTUyOVoXDTA5MDUzMDE5MTUyOVow
czEPMA0GA1UEBBMGQWx0bWFuMRUwEwYDVQQqEwxKZWZmcmV5IEVyaWMxHDAaBgNVBAMTE0pl
ZmZyZXkgRXJpYyBBbHRtYW4xKzApBgkqhkiG9w0BCQEWHGphbHRtYW5Ac2VjdXJlLWVuZHBv
aW50cy5jb20wggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQCtf5bVJdYFtHIrV2XA
LpA5oaMu7FPYU7RP7vJhd8Cu9Kd9ud2crX2pHK4avuPaYb4Vg9qIzPrPadePhJ3OWwNt1ZlU
lpc5URnOfpg/I9iymZBUSnCFVLuIvoncacqyUlzqdYEF8XGEoEL66bj8uoCSX0D7ZjZiAS89
93NvgiPYpf10acMyWQ4max+P7Wg9T03Nw2F6EsmP6gWxBRsekTXeN6QjJdvaK0846lDqeBFo
CEzIUMQXj2kiXVPCPEdxPc/L1sDMYf0GLaDIg8qyThpGd0X6DwfK3RWcMy8DV7Q5Z+jSEdPn
5X0l4anOTrjr3IwE57MC3bVs0EEpUODTzftnAgMBAAGjOTA3MCcGA1UdEQQgMB6BHGphbHRt
YW5Ac2VjdXJlLWVuZHBvaW50cy5jb20wDAYDVR0TAQH/BAIwADANBgkqhkiG9w0BAQUFAAOB
gQA9kndmeLrdQOUbhNGGms/FnfDyraH4OjA4PIIMOCbGWK0YXczs/Fqn4XkT70SG4s8v4Zg6
TaAcJrZBVcZQXyzrhlF2Zev/g69zZMHQe+2r4i/3FBVKAtFCoea1vgwJ5TfZYlKvt4D0Z4ze
xu9Y0VwCIR4plWjVD76zC2CGB/2fhjCCAz8wggKooAMCAQICAQ0wDQYJKoZIhvcNAQEFBQAw
gdExCzAJBgNVBAYTAlpBMRUwEwYDVQQIEwxXZXN0ZXJuIENhcGUxEjAQBgNVBAcTCUNhcGUg
VG93bjEaMBgGA1UEChMRVGhhd3RlIENvbnN1bHRpbmcxKDAmBgNVBAsTH0NlcnRpZmljYXRp
b24gU2VydmljZXMgRGl2aXNpb24xJDAiBgNVBAMTG1RoYXd0ZSBQZXJzb25hbCBGcmVlbWFp
bCBDQTErMCkGCSqGSIb3DQEJARYccGVyc29uYWwtZnJlZW1haWxAdGhhd3RlLmNvbTAeFw0w
MzA3MTcwMDAwMDBaFw0xMzA3MTYyMzU5NTlaMGIxCzAJBgNVBAYTAlpBMSUwIwYDVQQKExxU
aGF3dGUgQ29uc3VsdGluZyAoUHR5KSBMdGQuMSwwKgYDVQQDEyNUaGF3dGUgUGVyc29uYWwg
RnJlZW1haWwgSXNzdWluZyBDQTCBnzANBgkqhkiG9w0BAQEFAAOBjQAwgYkCgYEAxKY8VXNV
+065yplaHmjAdQRwnd/p/6Me7L3N9VvyGna9fww6YfK/Uc4B1OVQCjDXAmNaLIkVcI7dyfAr
hVqqP3FWy688Cwfn8R+RNiQqE88r1fOCdz0Dviv+uxg+B79AgAJk16emu59l0cUqVIUPSAR/
p7bRPGEEQB5kGXJgt/sCAwEAAaOBlDCBkTASBgNVHRMBAf8ECDAGAQH/AgEAMEMGA1UdHwQ8
MDowOKA2oDSGMmh0dHA6Ly9jcmwudGhhd3RlLmNvbS9UaGF3dGVQZXJzb25hbEZyZWVtYWls
Q0EuY3JsMAsGA1UdDwQEAwIBBjApBgNVHREEIjAgpB4wHDEaMBgGA1UEAxMRUHJpdmF0ZUxh
YmVsMi0xMzgwDQYJKoZIhvcNAQEFBQADgYEASIzRUIPqCy7MDaNmrGcPf6+svsIXoUOWlJ1/
TCG4+DYfqi2fNi/A9BxQIJNwPP2t4WFiw9k6GX6EsZkbAMUaC4J0niVQlGLH2ydxVyWN3amc
OY6MIE9lX5Xa9/eH1sYITq726jTlEBpbNU1341YheILcIRk13iSx0x1G/11fZU8xggNkMIID
YAIBATB2MGIxCzAJBgNVBAYTAlpBMSUwIwYDVQQKExxUaGF3dGUgQ29uc3VsdGluZyAoUHR5
KSBMdGQuMSwwKgYDVQQDEyNUaGF3dGUgUGVyc29uYWwgRnJlZW1haWwgSXNzdWluZyBDQQIQ
OwT6RFyaiZbWFgboGiqEYTAJBgUrDgMCGgUAoIIBwzAYBgkqhkiG9w0BCQMxCwYJKoZIhvcN
AQcBMBwGCSqGSIb3DQEJBTEPFw0wODA2MjcwNDUyNDlaMCMGCSqGSIb3DQEJBDEWBBSWCxmZ
0cBsGmkNKBXZVPfp0a7ZxjBSBgkqhkiG9w0BCQ8xRTBDMAoGCCqGSIb3DQMHMA4GCCqGSIb3
DQMCAgIAgDANBggqhkiG9w0DAgIBQDAHBgUrDgMCBzANBggqhkiG9w0DAgIBKDCBhQYJKwYB
BAGCNxAEMXgwdjBiMQswCQYDVQQGEwJaQTElMCMGA1UEChMcVGhhd3RlIENvbnN1bHRpbmcg
KFB0eSkgTHRkLjEsMCoGA1UEAxMjVGhhd3RlIFBlcnNvbmFsIEZyZWVtYWlsIElzc3Vpbmcg
Q0ECEDsE+kRcmomW1hYG6BoqhGEwgYcGCyqGSIb3DQEJEAILMXigdjBiMQswCQYDVQQGEwJa
QTElMCMGA1UEChMcVGhhd3RlIENvbnN1bHRpbmcgKFB0eSkgTHRkLjEsMCoGA1UEAxMjVGhh
d3RlIFBlcnNvbmFsIEZyZWVtYWlsIElzc3VpbmcgQ0ECEDsE+kRcmomW1hYG6BoqhGEwDQYJ
KoZIhvcNAQEBBQAEggEAQEllA1q7EFqbS1920x4bgjyU/6qqBRPjL5qZFLPHxASTiw6Z/fE9
TTAV5D9Kh41PQETkEL1KEQ0hXBrpEIce/A+mbz5UL039kWfUyBMoxy/kofGRKTWhCcyaOKXD
F0dCYsT7kHwlv3iiVn8C6Hc5p0/+ISXn3RXQVJR1Kuqk21J9oxD2NK9I/WLRR/mfxGbxJM7G
C+e/q+nBt9fmW5mj0QFfFBec5ay5Z2HBDgtJQrDwm5sYHaarRE/m2P6zi7deQT+3u4Ji7uvd
RDCjDW7yablXbpAl181ED1kvAVnv+HBHizqJ7ZNlr8cBsY64bjGr3FaCoHnf3X+iirA7ddYI
mQAAAAAAAA==
--------------ms020408030808030409030809--
--===============0080749445==
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
________________________________________________
Kerberos mailing list Kerberos@mit.edu
https://mailman.mit.edu/mailman/listinfo/kerberos
--===============0080749445==--
