I'm using squid configured thus:

auth_param negotiate program /usr/bin/ntlm_auth --helper-protocol=gss-spnego 

Due to reverse DNS issues, a client sometimes presents a Kerberos ticket for the *wrong* SPN. When this happens, I see:


write(2, "GENSEC login failed: NT_STATUS_LOGON_FAILURE\n", 45) = 45
write(1, "NA * NT_STATUS_LOGON_FAILURE\n", 29) = 29


Surely it shouldn't just abort? I would expect it to give me a SPNEGO response telling me to try NTLMSSP next?

Yes, my client's negTokenInit *did* offer that:

        GSS-API Generic Security Service Application Program Interface
            OID: 1.3.6.1.5.5.2 (SPNEGO - Simple Protected Negotiation)
            Simple Protected Negotiation
                negTokenInit
                    mechTypes: 5 items
                        MechType: 1.2.840.113554.1.2.2 (KRB5 - Kerberos 5)
                        MechType: 1.3.5.1.5.2 (iso.3.5.1.5.2)
                        MechType: 1.2.840.48018.1.2.2 (MS KRB5 - Microsoft Kerberos 5)
                        MechType: 1.3.6.1.5.2.5 (iso.3.6.1.5.2.5)
                        MechType: 1.3.6.1.4.1.311.2.2.10 (NTLMSSP - Microsoft NTLM Security Support Provider)
                    mechToken: 60820e3e06092a864886f71201020201006e820e2d30820e...
                    krb5_blob: 60820e3e06092a864886f71201020201006e820e2d30820e...