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Check NixOS configurations / eval-hosts (pull_request) Failing after 9m44s
HM's useUserPackages creates a users.users stub for every configured HM user, which lands wayne in /etc/passwd. NixOS adds pam_sss.so with the "localusers" flag to the sudo PAM stack when SSSD is enabled; that flag causes pam_sss to skip SSSD for any user found in local /etc/passwd, falling through to pam_unix which has no shadow password for the stub. Result: sudo auth always fails for the IPA user despite being in wheel. Use NOPASSWD for the IPA user in sudoers instead. The IPA user already authenticated to reach a shell (SSH key from IPA or Kerberos), so re-prompting via a broken PAM path is security theater on a homelab. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>