Re: [PATCH 0/4 v2] Split CIFS_SessSetup()

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On Thu, 2014-05-01 at 13:41 +0100, Sachin Prabhu wrote:
> I am investigating the possibility of adding support for gss-proxy in the
> cifs client module. As part of that investigation, I was looking at the
> CIFS_SessSetup() function. This is a long function which handles multiple auths
> using if conditions and switch statements. The code struction makes it
> difficult to modify of add support for new authentication mechanisms.
> 
> The proposal is to split the various authentication code into its own separate
> functions. This increases the lines of code but will simplify maintenance and
> addition of new auth methods.
> 
> The short term goal is to add gss-proxy support for kerberos authentication.
> This will require to and fro communication with the gss-proxy module over a
> unix socket.
> 
> Further long term goals are 
> 1) Add support for NTLMSSP using SPNEGO,
> 2) Allow clients to negotiate which authentication mechanism to use using SPNEGO.
> 
> I would like the opinion of this list about these proposed changes.
> Is there any part of the code which needs changing?
> 
> V2:
> - Ensure that sess_data allocated on intermediate patches are freed.
> - Remove ifdef-endif blocks from the switch statement in CIFS_SessSetup().
> 
> Sachin Prabhu (4):
>   cifs: Split lanman auth from CIFS_SessSetup()
>   cifs: Split ntlm and ntlmv2 authentication methods off
>     CIFS_SessSetup()
>   cifs: Split Kerberos authentication off CIFS_SessSetup()
>   cifs: Separate rawntlmssp auth from CIFS_SessSetup()
> 
>  fs/cifs/sess.c | 1142 +++++++++++++++++++++++++++++++++++++++-----------------
>  1 file changed, 799 insertions(+), 343 deletions(-)
> 

I had a cursory look at the patches, and I think in general the
direction is good, and will make it much easier to use gss-proxy going
forward.

Simo.

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