RE: [squid-users] Re: Re: Creating a kerberos Service Principal.

Nick,
 
I tried but with not much success.
 
.................
No computer account for squid-http found, creating a new one.
Error: ldap_add_ext_s failed (Insufficient access)
Error: ldap_check_account failed (No CSI structure available)
Error: set_password failed
 -- krb5_cleanup: Destroying Kerberos Context
 -- ldap_cleanup: Disconnecting from LDAP server
 -- init_password: Wiping the computer password structure
...............................
 

 
 
regards,
 
 
Bilal
----------------------------------------
> From: Nick.Cairncross_at_condenast.co.uk
> To: gigoz_at_msn.com; huaraz_at_moeller.plus.com; squid-users_at_squid-cache.org
> Date: Thu, 15 Apr 2010 09:31:40 +0100
> Subject: Re: [squid-users] Re: Re: Creating a kerberos Service Principal.
>
> Bilal,
>
> I think we're doing a similar thing here! See my post earlier about SPN. I think you need to be using the fqdn of the machine in the HTTP/ spn & upn and not just the domain. Also check your DNS and host local host entries.
>
> E.g.: msktutil -c -b "CN=COMPUTERS" -s HTTP/squid1.[mydomain] -k /etc/squid/HTTP.keytab --computer-name auth1 --upn HTTP/squid1 --server dc1 -verbose
>
> Nick
>
>
>
> On 15/04/2010 07:22, "GIGO ." wrote:
>
>
>
> Dear Markus/all,
>
>
> I am unable to create the keytab using mskutil please help me out i followed the following steps:
>
> 1. I created a OU and named it UnixOU
> 2. I created a group account in the UnixOU and named it as UnixAdmins
> 3. I make my windows account bilal_admin part of UnixAdmins group.
> 4. I set the settings of UnixOU to be managed by UnixAdmins.
> 5. Then i synch time of Squid Machine and Active directory.
> 6. My domain fully qualified domain name is v.local and netbios names is V.
> 7. My domain controller name is vdc (fqdn=vdc.v.local)
> 8. The following lines were changed in the krb5.conf while rest being untouched.
>
> [libdefaults]
> default_realm=V.LOCAL
>
>
> [realms]
>
> V.LOCAL = {
> kdc = vdc.v.local:88
> admin_server = kerberos.example.com:749 (e.g this not changed does it matter at the step of creation of keytab)
> default_domain = example.com (unchanged)
> }
>
>
>
>
> The i run the following commands to create the keytab:
>
> kinit squidadmin_at_V.LOCAL
>
>
> msktutil -c -b "OU=unixPrincipals" -s HTTP/v.local -h squidLhrTest.v.local -k /etc/squid/HTTP.keytab --computer-name squid-http --upn HTTP/v.local --server vdc.v.local --verbose
>
> Output of the Command:
>
> -- init_password: Wiping the computer password structure
> -- finalize_exec: Determining user principal name
> -- finalize_exec: User Principal Name is: HTTP/v.local_at_V.LOCAL
> -- create_fake_krb5_conf: Created a fake krb5.conf file: /tmp/.mskt-3550krb5.conf
> -- get_krb5_context: Creating Kerberos Context
> -- try_machine_keytab: Using the local credential cache: /tmp/.mskt-3550krb5_ccache
> -- try_machine_keytab: krb5_get_init_creds_keytab failed (Client not found in Kerberos database)
> -- try_machine_keytab: Unable to authenticate using the local keytab
> -- try_ldap_connect: Connecting to LDAP server: vdc.v.local
> -- try_ldap_connect: Connecting to LDAP server: vdc.v.local
> SASL/GSSAPI authentication started
> SASL username: squidadmin_at_V.LOCAL
> SASL SSF: 56
> SASL installing layers
> -- ldap_get_base_dn: Determining default LDAP base: dc=v,dc=local
> Warning: No DNS entry found for squidLhrTest.v.local
> -- get_short_hostname: Determined short hostname: squidLhrTest-v-local
> -- finalize_exec: SAM Account Name is: squid-http$
> Updating all entries for squidLhrTest.v.local in the keytab /etc/squid/HTTP.keytab
> -- try_set_password: Attempting to reset computer's password
> -- ldap_check_account: Checking that a computer account for squid-http$ exists
> No computer account for squid-http found, creating a new one.
> Error: ldap_add_ext_s failed (Insufficient access)
> Error: ldap_check_account failed (No CSI structure available)
> Error: set_password failed
> -- krb5_cleanup: Destroying Kerberos Context
> -- ldap_cleanup: Disconnecting from LDAP server
> -- init_password: Wiping the computer password structure
>
>
> please help me resolving the issue.
>
> regards,
>
> Bilal Aslam
>
>
>
>
> ----------------------------------------
>> To: squid-users_at_squid-cache.org
>> From: huaraz_at_moeller.plus.com
>> Date: Fri, 9 Apr 2010 08:10:19 +0100
>> Subject: [squid-users] Re: Re: Creating a kerberos Service Principal.
>>
>> Hi Bilal,
>>
>> I create a new OU in Active Directory like OU=UnixPrincipals,DC=... I
>> then create a Windows Group UnixAdministrators and add the Windows account
>> of the UnixAdministrators to it. Finally I change the permissions on the
>> OU=UnixPrincipals so that the members of the group UnixAdministrators have
>> full rights (or limited rights ) for objects under this OU.
>>
>> Regards
>> Markus
>>
>> "GIGO ." wrote in message
>> news:SNT134-w395B3433738667DED2186EB9150_at_phx.gbl...
>>
>> Markus could not get you please can you elaborate a bit.
>>
>>
>> thank you all!
>>
>> regards,
>>
>> Bilal
>>
>> ----------------------------------------
>>> To: squid-users_at_squid-cache.org
>>> From: huaraz_at_moeller.plus.com
>>> Date: Thu, 8 Apr 2010 20:04:30 +0100
>>> Subject: [squid-users] Re: Creating a kerberos Service Principal.
>>>
>>> BTW You do not need Administrator rights. You can set permission for
>>> different Groups on OUs for example for Unix Kerberos Admins.
>>>
>>> Markus
>>>
>>> "Khaled Blah" wrote in message
>>> news:n2j4a3250ab1004080957id2f4a051xb31445428c62bea0_at_mail.gmail.com...
>>> Hi Bilal,
>>>
>>> 1. ktpass and msktutil practically do the same, they create keytabs
>>> which include the keys that squid will need to decrypt the ticket it
>>> receives from the user. However ktpass only creates a file which you
>>> will then have to securely transfer to your proxy server so that squid
>>> can access it. Using msktutil on your proxy server, you can get the
>>> same keytab without having to transfer it. Thus, msktutil saves you
>>> some time and hassle. AFAIR both need "Administrator" rights, which
>>> means the account used for ktpass/msktutil needs to be a member of the
>>> Administrator group.
>>>
>>>
>>> 2. To answer this question, one would need more information about your
>>> network and your setup. Basically, mixing any other authentication
>>> method with Kerberos is not a good idea. That's because if the other
>>> method is insecure or less secure an attacker who gains access to a
>>> user's credentials will be able to impersonate that user against
>>> Kerberos and those be able to use ALL services that this user has
>>> access to. In any case DO NOT use basic auth with Kerberos in a
>>> public, set-up. That's a recipe for disaster. Digest auth and NTLM
>>> (v2) might be suitable but these are in fact less secure than Kerberos
>>> and thus not preferrable. One down-side to Kerberos is that it's an
>>> "all-or-nothing" service, either you use Kerberos and only Kerberos or
>>> you risk security breaches in any "mixed" situation.
>>>
>>> HTH
>>>
>>> Khaled
>>>
>>> 2010/4/6 GIGO . :
>>>>
>>>> Dear All,
>>>>
>>>> Please guide me in regard to SSO setup with Active Directory(No
>>>> winbind/Samba). I have the following questions in this regard.
>>>>
>>>>
>>>>
>>>> 1. Creating a Kerberos service principal and keytab file that is used by
>>>> the Squid what is the effective method? Difference between using Ktpass
>>>> vs
>>>> Msktutil package? What rights would i be required in Active Directory and
>>>> if none then why so?
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> 2. How to configure the fallback Authentication scheme if Kerberos fails?
>>>> Ldap authentication using basic looks to be an option but isnt it less
>>>> secure? is there a better approach possible.
>>>>
>>>>
>>>>
>>>>
>>>> regards,
>>>>
>>>> Bilal Aslam
>>>> _________________________________________________________________
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>>>
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Received on Thu Apr 15 2010 - 10:17:47 MDT