Re: Trouble negotiate_kerberos_auth

Marcio Demetrio Bacci <marciobacci@xxxxxxxxx> · Sun, 28 Aug 2016 22:58:25 -0300

Hi Markus, thank you for help me.

When I type the klist command, the result is:

Ticket cache: FILE:/tmp/krb5cc_0
Default principal: robert@xxxxxxxxxxxxx
Valid starting       Expires              Service principal
28-08-2016 22:40:53  29-08-2016 08:40:53  krbtgt/CMS.ENSINO.BR@xxxxxxxxxxxxx
    renew until 29-08-2016 22:40:41

But, I have the following result to command bellow:
/usr/lib64/squid/negotiate_kerberos_auth_test proxy.cms.ensino.br| awk '{sub(/Token:/,"YR"); print $0}END{print "QQ"}' | /usr/lib64/squid/negotiate_kerberos_auth -r -s HTTP/proxy.cms.ensino.br 

Result:
TT oYGbMIGYoAMKAQGhCAYGKwYBBQIFooGGBIGDBQEwFKESBBBDTUIuRU5TSU5PLkVCLkJSfmkwZ6ADAgEFoQMCAR6iERgPMjAxNjA4MjkwMTM2MDVaowUCAwK7P6QRGA8yMDE2MDgyOTAxMzYwNVqlBQIDBhpppgMCAQepFRsTPHVuc3BlY2lmaWVkIHJlYWxtPqoLMAmgAwIBAKECMAA=
BH quit command

The HTTP/proxy.cms.ensino.br is in keytab files

I don't have the "test_negotiate_auth.sh" file in src/auth/negotiate/kerberos, but I have /usr/lib64/squid/negotiate_kerberos_auth_test, thus I'm using it.

My Linux distribution is CentOS 7

Regards,

Márcio

2016-08-28 15:24 GMT-03:00 Markus Moeller <huaraz@xxxxxxxxxxxxxxxx>:

HI Marcio,

  The helper need a Kerberos token as input.  Please have a look 
at test_negotiate_auth.sh  which is in src/auth/negotiate/kerberos of the 
trunk version. The squid hostname must match the entry in your keytab and you 
must have done kinit to authenticate against a Kerberos server (e.g. AD) as user 
first.

Regards
Markus 

"Marcio Demetrio Bacci" <marciobacci@xxxxxxxxx> wrote in message 
news:CA+0TdyqEAt4L5KO4zrJNJ1aUe64mY2Re7z95KFdqW7Y8SV_qbg@mail.gmail.com...

I have trouble to authenticate Squid3 with kerberos in Samba4 domain. I'm 
using CentOS 7 and Squid 3.3.8 (yum install squid)

When I type the bellow command in terminal: 

/usr/lib64/squid/negotiate_kerberos_auth -d -i -s 
HTTP/proxy.cms.ensino.br@CMS.ENSINO.BR
john xyz@12345

I have 
the following error:
negotiate_kerberos_auth.cc(315): pid=6364 :2016/08/27 
10:44:33| negotiate_kerberos_auth: DEBUG: Got 'john xyz@12345' from squid 
(length: 14).
negotiate_kerberos_auth.cc(362): pid=6364 :2016/08/27 10:44:33| 
negotiate_kerberos_auth: ERROR: Invalid request [john xyz@12345]
BH invalid 
request 

Here are my files 
configuration:

/etc/krb5.conf
[libdefaults]

default_realm = CMS.ENSINO.BR
[realms]

CMS.ENSINO.BR = {
    kdc = 
dc1.cms.ensino.br:88

admin_server = dc1.cms.ensino.br

default_domain = CMS.ENSINO.BR 

    }
[domain_realm]
    .cms.ensino.br = CMS.ENSINO.BR
    cms.ensino.br = CMS.ENSINO.BR

Keytab name: 
FILE:/etc/krb5.keytab
KVNO Principal
---- 
--------------------------------------------------------------------------

1 proxy-k$@CMS.ENSINO.BR
   1 
proxy-k$@CMS.ENSINO.BR
   1 
proxy-k$@CMS.ENSINO.BR
   1 
HTTP/proxy.cms.ensino.br@CMS.ENSINO.BR
   1 
HTTP/proxy.cms.ensino.br@CMS.ENSINO.BR
   1 
HTTP/proxy.cms.ensino.br@CMS.ENSINO.BR
   1 
host/proxy.cms.ensino.br@CMS.ENSINO.BR
   1 
host/proxy.cms.ensino.br@CMS.ENSINO.BR
   1 
host/proxy.cms.ensino.br@CMS.ENSINO.BR
   1 
host/proxy.cms.ensino.br@CMS.ENSINO.BR
   1 
host/proxy.cms.ensino.br@CMS.ENSINO.BR
   1 
host/PROXY@xxxxxxxxxxxxx
   1 
host/PROXY@xxxxxxxxxxxxx
   1 
host/PROXY@xxxxxxxxxxxxx
   1 
host/PROXY@xxxxxxxxxxxxx
   1 
host/PROXY@xxxxxxxxxxxxx
   1 PROXY$@CMS.ENSINO.BR
   1 PROXY$@CMS.ENSINO.BR
   1 PROXY$@CMS.ENSINO.BR
   1 PROXY$@CMS.ENSINO.BR
   1 PROXY$@CMS.ENSINO.BR
   1 proxy-k$@CMS.ENSINO.BR
   1 proxy-k$@CMS.ENSINO.BR
   1 
HTTP/proxy.cms.ensino.br@CMS.ENSINO.BR
   1 
HTTP/proxy.cms.ensino.br@CMS.ENSINO.BR
   1 
HTTP/PROXY@xxxxxxxxxxxxx
   1 
HTTP/PROXY@xxxxxxxxxxxxx
   1 
HTTP/PROXY@xxxxxxxxxxxxx
   1 
HTTP/PROXY@xxxxxxxxxxxxx
   1 
HTTP/PROXY@xxxxxxxxxxxxx

Keytab name: 
FILE:/etc/squid/PROXY.keytab
KVNO Principal
---- 
--------------------------------------------------------------------------

1 proxy-k$@CMS.ENSINO.BR
   1 
proxy-k$@CMS.ENSINO.BR
   1 
proxy-k$@CMS.ENSINO.BR
   1 
HTTP/proxy.cms.ensino.br@CMS.ENSINO.BR
   1 
HTTP/proxy.cms.ensino.br@CMS.ENSINO.BR
   1 
HTTP/proxy.cms.ensino.br@CMS.ENSINO.BR
   1 
host/proxy.cms.ensino.br@CMS.ENSINO.BR
   1 
host/proxy.cms.ensino.br@CMS.ENSINO.BR
   1 
host/proxy.cms.ensino.br@CMS.ENSINO.BR

/etc/sysconfig/squid
# 
default squid options
SQUID_OPTS=""
# Time to wait for Squid to shut down 
when asked. Should not be necessary
# most of the 
time.
SQUID_SHUTDOWN_TIMEOUT=100
# default squid conf 
file
SQUID_CONF="/etc/squid/squid.conf"

KRB5_KTNAME=/etc/squid/PROXY.keytab
export 
KRB5_KTNAME

kinit and klist commands are OK.

Best Regards,

Márcio

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