[jcgl]

Could be interesting. What do you see as the main problems with NSS? I've never needed to use it directly myself. It seems quite crusty of course, but presumably there's more that your referencing.

Moving from linking stuff in-process to IPC (such as systemd-userdbd is promoting) _seems_ to me like a natural thing to do, given the nastiness that can happen when you bring something complex into your own address space (via C semantics nonetheless). But I'm not very knowledgeable here and would be interested to hear your overall take.

[cyberax]

NSS/PAM modules have to work inside arbitrary environments. And vice versa, environments have to be ready for arbitrary NSS modules.

For example, you technically can't sandbox any app with NSS/PAM modules, because a module might want to send an email (yes, I saw that in real life) or use a USB device.

NSS/PAM need to be replaced with IPC-based solutions. systemd is evolving a replacement for PAM.

And for NSS modules in particular, we even have a standard solution: NSCD. It's even supported by musl libc, but for some reason nobody even _knows_ that it exists. Porting the NSCD protocol to Go is like 20 minutes of work. I looked at doing that more than once, but got discouraged by the other 99% of complexity in getting something like this into the core Go code.