openssh unix dev - Oct 2018 - Fwd: Username remapping/renaming during login

Hi,

I'd  like  to  ask  you  (I couldn't find an answer on OpenSSH mailing
lists)  if  it's  possible  to  rename/remap/manipulate  with username
during logging?

I    found    a    similar    solution    to    what   I   want   here
https://sourceforge.net/projects/ukngi/files/meg/1.0-1/  but  this  is
gsissh.

To be precise I tried 2 possible solutions:

a/ enabled  pam_script  pam  module  as  the  first  module during
authentication and set PAM_USER in pam_script_auth script

b/  I  created  my  custom  module in which inside pam_sm_authenticate
function I call pam_set_item where I change the username


but  both failed. Could you please help me and answer if it's possible
at all?? (let's leave other issues e.g. security aside)


Best,
Damian

On Fri, 19 Oct 2018, Damian Kaliszan wrote:
> Hi,
> 
> I'd  like  to  ask  you  (I couldn't find an answer on OpenSSH
mailing
> lists)  if  it's  possible  to  rename/remap/manipulate  with username
> during logging?
> 
> I    found    a    similar    solution    to    what   I   want   here
> https://sourceforge.net/projects/ukngi/files/meg/1.0-1/  but  this  is
> gsissh.
> 
> To be precise I tried 2 possible solutions:
> 
> a/ enabled  pam_script  pam  module  as  the  first  module during
> authentication and set PAM_USER in pam_script_auth script
> 
> b/  I  created  my  custom  module in which inside pam_sm_authenticate
> function I call pam_set_item where I change the username
> 
> but  both failed. Could you please help me and answer if it's possible
> at all?? (let's leave other issues e.g. security aside)
OpenSSH doesn't support username remapping via PAM, but you should be
able to do it via a NSS module.

-d