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Having pam_unix set to "sufficient" means early-succeeding account management group, as soon as pam_unix.so is succeeding. This is not sufficient. For example, nixos modules might install nss modules for user lookup, so pam_unix.so succeeds, and we end the stack successfully, even though other pam account modules might want to do more extensive checks. Other distros seem to set pam_unix.so to 'required', so if there are other pam modules in that management group, they get a chance to do some validation too. For SSSD, @PsyanticY already added a workaround knob in https://github.com/NixOS/nixpkgs/pull/31969, while stating this should be the default anyway. I did some thinking in what could break - after this commit, we require pam_unix to succeed, means we require `getent passwd $username` to return something. This is the case for all local users due to the passwd nss module, and also the case for all modules installing their nss module to nsswitch.conf - true for ldap (if not explicitly disabled) and sssd. I'm not so sure about krb5, cc @eqyiel for opinions. Is there some nss module loaded? Should the pam account module be placed before pam_unix? We don't drop the `security.pam.services.<name?>.sssdStrictAccess` option, as it's also used some lines below to tweak error behaviour inside the pam sssd module itself (by changing it's 'control' field). This is also required to get admin login for Google OS Login working (#51566), as their pam_oslogin_admin accounts module takes care of sudo configuration. |
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*** NixOS *** NixOS is a Linux distribution based on the purely functional package management system Nix. More information can be found at http://nixos.org/nixos and in the manual in doc/manual.