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

Mon Oct 27 20:53:18 UTC 2014

Hi Pedro,

   Can you capture the traffic from one Windows 7 on XP client on port 88 ( just after the login before access a website via squid until successful or unsuccessful accessing the website) using wireshark ?   Send me the .cap files to check.

Markus

"Pedro Lobo" <palobo at gmail.com> wrote in message news:b4adceec-5a53-4212-b16c-106237fc4504 at Pedros-iPhone...
Hi Markus Moeller,

Hi Markus,

Yeah, I'm currently using that option and permissions are correct too. 

On 27 Oct 2014 19:47, Markus Moeller wrote: 

  Hi Pedro,

    Did you try the –s GSS_C_NO_NAME option ?

  Markus

  "Pedro Lobo" <palobo at gmail.com> wrote in message news:94F74226-F24B-4910-95B7-B86ACE815995 at gmail.com...
  Hey Everybody,

  Seems as though I celebrated too soon on Saturday. Today things are back to not working for Windows 7+ machines and XP/2003 machines are working just fine.

  I've also checked the permissions on the keytab file and they haven't changed since Saturday, so it's not that... ARGH!!!!

  Craving ideas and solutions right now... Pilot users are less than satisfied ;)

  Cheers,
  Pedro

  On 25 Oct 2014, at 14:13, Markus Moeller wrote:

    Hi Pedro,

    I wonder if he upper case in the name is a problem. Can you try

    auth_param negotiate program /usr/lib/squid3/negotiate_kerberos_auth -d -r -s GSS_C_NO_NAME

    instead of

    auth_param negotiate program /usr/lib/squid3/negotiate_kerberos_auth -d -r -s HTTP/proxy01tst.fake.net

    Markus

    "Pedro Lobo" palobo at gmail.com wrote in message news:FD6832B9-3F1F-48C6-A76F-47A224F1697B at gmail.com...
    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

    Empresa certificada ISO 9001, ISO 20000 e ISO 27001

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