[squid-users] squid 4 fails to authenticate using NTLM

[zby at post.cz]

I found one more thing in the cache.log:

Got user=[user1] domain=[DOM1] workstation=[machine1] len1=24 len2=334
Login for user [DOM1\[user1]@[machine1 failed due to [Reading winbind reply 
failed!]
ntlmssp_server_auth_send: Checking NTLMSSP password for DOM1\user1 failed: 
NT_STATUS_UNSUCCESSFUL
gensec_update_done: ntlmssp[0x55713e452900]: NT_STATUS_UNSUCCESSFUL
GENSEC login failed: NT_STATUS_UNSUCCESSFUL




Why failed?

/var/lib/samba:


drwxr-x---  2 root winbindd_priv   4096 Jul 23 18:09 winbindd_privileged

/var/run/samba:

drwxr-xr-x 2 root root     60 Jul 23 18:09 winbindd




If I chmod to anything else than expected winbindd fails to start 
complaining about an unexpected dir mode.

The dir modes remain the same as "defined" in the debian package.

ntlm_auth --username=user1 run as a regular user results in: "NT_STATUS_OK: 
The operation completed successfully. (0x0)"

It should fail if not allowed to read from winbind, I suppose.




Thanks.

Zb









---------- Původní e-mail ----------
Od: Amos Jeffries <squid3 at treenet.co.nz>
Komu: squid-users at lists.squid-cache.org
Datum: 23. 7. 2019 11:03:37
Předmět: Re: [squid-users] squid 4 fails to authenticate using NTLM 
"On 23/07/19 7:53 am, zby wrote:
> My problem:  my browser keeps on prompting for authentication.
> Facts:
> 
> Debian 10 x86_64
> squid-4.6 + samba-4.9
> joined AD using "net ads join -U ...". OK.
> wbinfo -t : OK
> wbinfo -P or -p : OK
> wbinfo -i userXYZ : returns data (OK)
> wbinfo -g (well, fails to "deliver", too many users?)
> smbclient -U userXYZ //host/share : works, logs me in

This is irrelevant to Squid. It only tells that the user account has
filesystem access privileges. Nothing about web access privileges, or
whether the *Squid* user account has access to authenticate user logins.


> 
> wbinfo -a domain\\user%pass:
> plaintext password authentication succeeded

"plaintext" means Basic authentication.

> challenge/response password authentication failed
> 

Challenge/Response could mean anything auth related.


> sqadmin at host13:~$ ntlm_auth --helper-protocol=squid-2.5-ntlmssp
> --domain=ad001
> userw01 Passwd001
> SPNEGO request [userw01 Passwd001] invalid prefix
> BH SPNEGO request invalid prefix
> 

"userw01 Passwd001" is not a SPNEGO token.

see
<https://wiki.squid-cache.org/Features/AddonHelpers#Negotiate_and_NTLM_
Scheme>

Pass the helper the "KK" request command and the token you see in the
HTTP headers. For example:

KK TlRMTVNTUAADAAAAGAAYAIwAAABOAU4BpAAAAAoACgBYAAAAEAAQAGIAAAAa...



Amos
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