On Wed, Jan 16, 2019 at 01:26:51PM +0100, Eugen Mayer wrote:
> Hello,
> 
> i am really struggling to understand if what i am trying to do is actually 
> something that is supported by SSD in that terms.
> 
> I have a lab setup with a Windows Server 2012 with a konfigured KDC, DNS, NTP 
> .. keytab, spn.
> 
> This setup already works for apache+mod_kerb_auth for both cases, 
> auto-negotiation of existing tickets. So i can do kinit + curl --negotiate on 
> a client and get pass the authentication.
> 
> Now i am trying to replace apache with nginx with this case. I want to use 
> nginx_pam, and then forward this to sssd using pam_sss.
> 
> My id_provider is ad, auth_provider is krb5, realm is KWTEST.LOCAL
> 
> I see that the AD access works using GSSAPI authentication using the provided 
> keytab file, but when a client request though nginx is handled, i see 
> something that sssd is trying to lookup www-data@KWTEST.LOCAL out of any 
> reason.
> 
> I would have expected that it uses the HOST requested by the client, like 
> HTTP/mywebservice.lan@KWTEST.LOCAL - in mod_auth_kerb one can set the SPN to 
> use, i am not sure how this is intended in sssd and that is my actual 
> question.
> 
> - Can SSSD offer "negotiation" through pam ... nginx at all? (reusing active 
> client krb tokens)

No, what you are looking for is GSSAPI support and it looks like
https://github.com/stnoonan/spnego-http-auth-nginx-module might be a
suitable module.

HTH

bye,
Sumit

> - What SPN is used when pam calls SSSD?
> 
> I hope i could explain this at least a little ;/
> 
> Thank you
> 
> Eugen

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