os/kay/modules/services/sftp.nix


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{ config, ... }:

let
  storage = "/hdd/users";
  user = config.global.userdata.name;
  pubKeys = config.users.users.${user}.openssh.authorizedKeys.keys;
in
{
  users = {
    groups."sftp".members = [ ];

    users."sftp" = {
      group = "sftp";
      shell = "/run/current-system/sw/bin/nologin";
      isNormalUser = true;
      openssh.authorizedKeys.keys = [
        "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIFmA1dyV+o9gfoxlbVG0Y+dn3lVqdFs5fMqfxyNc5/Lr sftp@cez"
      ]
      ++ pubKeys;
    };

    users."nazer" = {
      group = "sftp";
      shell = "/run/current-system/sw/bin/nologin";
      isNormalUser = true;
      openssh.authorizedKeys.keys = [
        "ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAICV09w9Ovk9wk4Bhn/06iOn+Ss8lK3AmQAl8+lXHRycu nazu@pc"
      ];
    };
  };

  services.openssh = {
    # support samsing files
    settings = {
      HostKeyAlgorithms = "+ssh-rsa";
      PubkeyAcceptedAlgorithms = "+ssh-rsa";
      Macs = [ "hmac-sha2-256" ];
    };

    # sandboxing
    extraConfig = ''
      Match Group sftp
      # chroot dir should be owned by root
      # and sub dirs by %u
      ChrootDirectory ${storage}/%u
      ForceCommand internal-sftp

      PermitTunnel no
      AllowAgentForwarding no
      AllowTcpForwarding no
      X11Forwarding no
    '';
  };
}