Requesting review of a PAM based on TPM NV storage

Hello!

I posted the same message in Gitter, but I think it mostly stays inactive s=
o posting it here as well.

As a fun little side-project, I have created a PAM that uses TPM's NV stora=
ge for PIN based authentication. It uses the authValue of Fapi_CreateNV() t=
o set the PIN and Fapi_NvRead() is used by PAM for verifying the PIN, if th=
e read operation is successful, the auth is approved. The implementation of=
 PAM is barebones and skips over many obvious checks. This is just a PoC to=
 check if using NV storage in the way I'm using is safe or not. So, I'd app=
reciate if good people of this community can review the code and tell me if=
 my novice attempt at this missed any obvious flaw.

Link to project: https://github.com/notsoshant/libpam-tpm

notsoshant