[squid-users] Kerberos Authentication Failing for Windows 7+ with BH gss_accept_sec_context() failed

[Pedro Lobo]

Hi Markus,

I used msktutil to create the keytab.


	msktutil -c -s HTTP/proxy01tst.fake.net -h proxy01tst.fake.net -k 
/etc/squid3/PROXY.keytab --computer-name proxy01-tst --upn 
HTTP/proxy01tst.fake.net --server srv01.fake.net --verbose


Output of klist -ekt:

	   2 10/24/2014 22:59:50 proxy01-tst$@FAKE.NET (arcfour-hmac)
	   2 10/24/2014 22:59:50 proxy01-tst$@FAKE.NET 
(aes128-cts-hmac-sha1-96)
	   2 10/24/2014 22:59:50 proxy01-tst$@FAKE.NET 
(aes256-cts-hmac-sha1-96)
	   2 10/24/2014 22:59:50 HTTP/proxy01tst.FAKE.net at FAKE.NET 
(arcfour-hmac)
	   2 10/24/2014 22:59:50 HTTP/proxy01tst.FAKE.net at FAKE.NET 
(aes128-cts-hmac-sha1-96)
	   2 10/24/2014 22:59:50 HTTP/proxy01tst.FAKE.net at FAKE.NET 
(aes256-cts-hmac-sha1-96)
	   2 10/24/2014 22:59:50 host/proxy01tst.FAKE.net at FAKE.NET 
(arcfour-hmac)
	   2 10/24/2014 22:59:50 host/proxy01tst.FAKE.net at FAKE.NET 
(aes128-cts-hmac-sha1-96)
	   2 10/24/2014 22:59:50 host/proxy01tst.FAKE.net at FAKE.NET 
(aes256-cts-hmac-sha1-96)


Yep, using MIT Kerberos

Thanks in advance for any help.

Cheers,
Pedro


On 25 Oct 2014, at 1:26, Markus Moeller wrote:

> Hi Pedro,
>
> How did you create your keytab ?  What does klist –ekt 
> <squid.keytab> show ( I assume you use MIT Kerberos) ?
>
> Markus
>
> "Pedro Lobo" <palobo at gmail.com> wrote in message 
> news:40E1E0E7-50C6-4117-94AA-50B06573430A at gmail.com...
> Hi Squid Gurus,
>
> I'm at my wit's end and in dire need of some squid expertise.
>
> We've got a production environment with a couple of squid 2.7 servers 
> using NTLM and basic authentication. Recently though, we decided to 
> upgrade and I'm now setting up squid 3.3 with Kerberos and NTLM 
> Fallback. I've followed just about every guide I could find and in my 
> testing environment, things were working great. Now that I've hooked 
> it up to the main domain, things are awry.
>
> If I use a machine that's not part of the domain, NTLM kicks in and I 
> can surf the web fine. If I use a Windows XP or Windows Server 2003, 
> kerberos works just fine, however, if I use a machine Windows 7, 8 or 
> 2008 server, I keep getting a popup asking me to authenticate and even 
> then, it's and endless loop until it fails. My cache.log is littered 
> with:
>
> negotiate_kerberos_auth.cc(200): pid=1607 :2014/10/24 23:03:01| 
> negotiate_kerberos_auth: ERROR: gss_accept_sec_context() failed: 
> Unspecified GSS failure.  Minor code may provide more information.
> 2014/10/24 23:03:01| ERROR: Negotiate Authentication validating user. 
> Error returned 'BH gss_accept_sec_context() failed: Unspecified GSS 
> failure.  Minor code may provide more information. '
> The odd thing, is that this has worked before. Help me Obi Wan... 
> You're my only hope! :)
>
> Current Setup
> Squid 3.3 running on Ubuntu 14.04 server. It's connected to a 2003 
> server with function level 2000 (I know, we're trying to fase out the 
> older servers).
>
> krb5.conf
>
> [libdefaults]
>     default_realm = FAKE.NET
>     dns_lookup_kdc = yes
>     dns_lookup_realm = yes
>     ticket_lifetime = 24h
>     default_keytab_name = /etc/squid3/PROXY.keytab
>
> ; for Windows 2003
>     default_tgs_enctypes = rc4-hmac des-cbc-crc des-cbc-md5
>     default_tkt_enctypes = rc4-hmac des-cbc-crc des-cbc-md5
>     permitted_enctypes = rc4-hmac des-cbc-crc des-cbc-md5
>
> [realms]
>     FAKE.NET = {
>             kdc = srv01.fake.net
>             kdc = srv02.fake.net
>             kdc = srv03.fake.net
>             admin_server = srv01.fake.net
>             default_domain = fake.net
>     }
>
> [domain_realm]
>     .fake.net = FAKE.NET
>     fake.net = FAKE.NET
>
>
> [logging]
> kdc = FILE:/var/log/kdc.log
> admin_server = FILE:/var/log/kadmin.log
> default = FILE:/var/log/krb5lib.log
> squid.conf
>
> auth_param negotiate program /usr/lib/squid3/negotiate_kerberos_auth 
> -d -r -s HTTP/proxy01tst.fake.net
> auth_param negotiate children 20 startup=0 idle=1
> auth_param negotiate keep_alive off
>
> auth_param ntlm program /usr/bin/ntlm_auth --diagnostics 
> --helper-protocol=squid-2.5-ntlmssp --domain=FAKE.NET
> auth_param ntlm children 10
> auth_param ntlm keep_alive off
> Cheers,
> Pedro
>
> Cumprimentos
> Pedro Lobo
> Solutions Architect | System Engineer
>
> pedro.lobo at pt.clara.net
> Tlm.: +351 939 528 827 | Tel.: +351 214 127 314
>
> Claranet Portugal
> Ed. Parque Expo
> Av. D. João II, 1.07-2.1, 4º Piso
> 1998-014 Lisboa
> www.claranet.pt
>
>
>
>
>
> Empresa certificada ISO 9001, ISO 20000 e ISO 27001
>
>
>
>
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Cumprimentos
Pedro Lobo
Solutions Architect | System Engineer

pedro.lobo at pt.clara.net
Tlm.: +351 939 528 827 | Tel.: +351 214 127 314

Claranet Portugal
Ed. Parque Expo
Av. D. João II, 1.07-2.1, 4º Piso
1998-014 Lisboa
www.claranet.pt
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