Re: [squid-users] Problems setting up Kerberos authentication

Markus Moeller wrote:
> Continuation needed means that the GSSAPI exchange has not finished and
> the server needs more data from the client. Can you see in wireshark if
> the token length is the one squid_kerb_auth says it is
> > squid_kerb_auth: Got 'YRYI...' from squid (length: 3607)

I could confirm that the data that the client sends in the HTTP request
is the same that is received by squid_kerb_auth. "YR " is added by squid
(the space in the log of my last post got lost).

Further, I discovered that authentication is working for users from
certain domains, but not for those at whose location the proxy is
standing at. I describe the AD domain setup in more details:

The computer account that is associated with the service principal in
the keytab file is from domain A.EXAMPLE.COM. Users, for who access is
not working, are from domain B1.B.EXAMPLE.COM. Access is working for
users from C.EXAMPLE.COM and a few others. The users from these "other"
domains have been tested by starting IE as a user from that domain on a
computer in domain C.EXAMPLE.COM. I forgot to mention that all the
clients are Windows XP with IE7.

The FQDN of the proxy is not in the Windows domain hierarchy. It is
proxy.d1.d.example.com.

I compiled squid_kerb_auth_test from Squid 3.1. On the proxy:

## With a user from non-working domain B1.B.EXAMPLE.COM
# kinit user1_at_B1.B.EXAMPLE.COM
user1_at_B1.B.EXAMPLE.COM's Password:
# squid_kerb_auth_test proxy.d1.d.example.com
2010/03/04 15:26:51| squid_kerb_auth_test: gss_init_sec_context()
failed: An unsupported mechanism was requested. unknown mech-code 0 for
mech unknown
Token: NULL
# kinit -S HTTP/proxy.d1.d.example.com_at_A.EXAMPLE.COM
user1_at_B1.B.EXAMPLE.COM's Password:
kinit: krb5_get_init_creds: Server
(HTTP/proxy.d1.d.example.com_at_B1.B.EXAMPLE.COM) unknown

## With a user from the domain of the proxy (A.EXAMPLE.COM)
# kinit user2_at_A.EXAMPLE.COM
user2_at_A.EXAMPLE.COM's Password:
# squid_kerb_auth_test proxy.d1.d.example.com
Token: YIIF...
# kinit -S HTTP/proxy.d1.d.example.com_at_A.EXAMPLE.COM
user2_at_A.EXAMPLE.COM's Password:

Tomorrow I will try with a user from another domain that is working and
that is outside A.EXAMPLE.COM. The content of my krb5.conf is:

[libdefaults]
   default_realm = A.EXAMPLE.COM

[realms]
   A.EXAMPLE.COM = {
     kdc = 10.0.0.1
     kdc = 10.0.0.2
   }
   B1.b.EXAMPLE.COM = {
     kdc = 10.1.0.1
     kdc = 10.1.0.2
   }

[domain_realm]
  .example.com = A.EXAMPLE.COM
  example.com = A.EXAMPLE.COM
  .d1.d.example.com = A.EXAMPLE.COM
  d1.d.example.com = A.EXAMPLE.COM

Fabian
Received on Thu Mar 04 2010 - 16:09:25 MST