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Last active Jun 16, 2021
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NixOS configuration for nh2's mail server presentation (https://nh2.me/recent/Running-your-own-mailserver.pdf)
# Edit this configuration file to define what should be installed on
# your system. Help is available in the configuration.nix(5) man page
# and in the NixOS manual (accessible by running ‘nixos-help’).
{ config, pkgs, ... }:
let
floatingIPv4 = "95.216.183.106";
floatingIPv6 = "2a01:4f9:c01f:65::1";
in
{
imports =
[ # Include the results of the hardware scan.
./hardware-configuration.nix
# Commit from https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/-/tree/nixos-20.09
(let commit = "02a45d9965133434c7b816cab2f47c8a7505e764"; in builtins.fetchTarball {
# Pick a commit from the branch you are interested in
url = "https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/-/archive/${commit}/nixos-mailserver-${commit}.tar.gz";
# And set its hash
sha256 = "04v66z0ijjm8bqpiqmq1aqrqj6r6jjz591lgijmk4frz7lksnz8k";
})
];
# Use the GRUB 2 boot loader.
boot.loader.grub.enable = true;
boot.loader.grub.version = 2;
# boot.loader.grub.efiSupport = true;
# boot.loader.grub.efiInstallAsRemovable = true;
# boot.loader.efi.efiSysMountPoint = "/boot/efi";
# Define on which hard drive you want to install Grub.
# boot.loader.grub.device = "/dev/sda"; # or "nodev" for efi only
# networking.hostName = "nixos"; # Define your hostname.
# networking.wireless.enable = true; # Enables wireless support via wpa_supplicant.
# The global useDHCP flag is deprecated, therefore explicitly set to false here.
# Per-interface useDHCP will be mandatory in the future, so this generated config
# replicates the default behaviour.
networking.useDHCP = false;
# See https://docs.hetzner.com/cloud/servers/static-configuration/
networking.interfaces.ens3.ipv4.addresses = [
{
address = "135.181.95.42";
prefixLength = 32;
}
# Floating IP
{
address = floatingIPv4;
prefixLength = 32;
}
];
networking.interfaces.ens3.ipv6.addresses = [
{
address = "2a01:4f9:c010:cf13::1";
prefixLength = 64;
}
# Floating IP
{
address = floatingIPv6;
prefixLength = 64;
}
];
networking.defaultGateway = { address = "172.31.1.1"; interface = "ens3"; };
networking.defaultGateway6 = { address = "fe80::1"; interface = "ens3"; };
networking.nameservers = [ "8.8.8.8" ];
# Configure network proxy if necessary
# networking.proxy.default = "http://user:password@proxy:port/";
# networking.proxy.noProxy = "127.0.0.1,localhost,internal.domain";
# Select internationalisation properties.
# i18n.defaultLocale = "en_US.UTF-8";
# console = {
# font = "Lat2-Terminus16";
# keyMap = "us";
# };
# Set your time zone.
# time.timeZone = "Europe/Amsterdam";
# List packages installed in system profile. To search, run:
# $ nix search wget
environment.systemPackages = with pkgs; [
dnsutils # for `dig`
htop
iperf3
nload
screen
vim
wget
];
# Some programs need SUID wrappers, can be configured further or are
# started in user sessions.
# programs.mtr.enable = true;
# programs.gnupg.agent = {
# enable = true;
# enableSSHSupport = true;
# pinentryFlavor = "gnome3";
# };
# List services that you want to enable:
# Enable the OpenSSH daemon.
services.openssh.enable = true;
# Open ports in the firewall.
# networking.firewall.allowedTCPPorts = [ ... ];
# networking.firewall.allowedUDPPorts = [ ... ];
# Or disable the firewall altogether.
# networking.firewall.enable = false;
# Enable CUPS to print documents.
# services.printing.enable = true;
# Enable sound.
# sound.enable = true;
# hardware.pulseaudio.enable = true;
# Enable the X11 windowing system.
# services.xserver.enable = true;
# services.xserver.layout = "us";
# services.xserver.xkbOptions = "eurosign:e";
# Enable touchpad support.
# services.xserver.libinput.enable = true;
# Enable the KDE Desktop Environment.
# services.xserver.displayManager.sddm.enable = true;
# services.xserver.desktopManager.plasma5.enable = true;
# Define a user account. Don't forget to set a password with ‘passwd’.
# users.users.jane = {
# isNormalUser = true;
# extraGroups = [ "wheel" ]; # Enable ‘sudo’ for the user.
# };
# This value determines the NixOS release from which the default
# settings for stateful data, like file locations and database versions
# on your system were taken. It‘s perfectly fine and recommended to leave
# this value at the release version of the first install of this system.
# Before changing this value read the documentation for this option
# (e.g. man configuration.nix or on https://nixos.org/nixos/options.html).
system.stateVersion = "20.03"; # Did you read the comment?
boot.loader.grub.devices = [ "/dev/sda" ];
# Initial empty root password for easy login:
users.users.root.initialHashedPassword = "";
services.openssh.permitRootLogin = "prohibit-password";
# Replace this by your SSH pubkey
users.users.root.openssh.authorizedKeys.keys = [
"ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAtwCIGPYJlD2eeUtxngmT+4yR7BMlK0F5kzj+84uHsxxsy+PXFrP/tScCpwmuoiEYNv/9WKnPJJfCA9XlIDr6cla1MLpaW6eg672TRYMmKzH6SLlkg+kyDmPxSIJw+KdKfnPYyva+Y/VocACYJo0voabUeLAVgtSKGz/AFzccjfOR0GmFO911zjAaR+jFb9M7t7dveNVKm9KbuBfu3giMgGg3/mKz1TKY8yk2ZOxpT5CllBb+B5BcEf+7IGNvNxr1Z0zz5cFXQ3LyBIZklnC/OaQCnD78BSiyPTkIXcmBFal2TaFwTDvki6PuCRpJy+dU1fDdgWLql97D0SVnjmmomw=="
];
mailserver = {
enable = true;
fqdn = "mailserver2.aws.nh2.me";
domains = [ "mailserver2.aws.nh2.me" ];
# A list of all login accounts. To create the password hashes, use
# mkpasswd -m sha-512 "super secret password"
loginAccounts = {
"user1@mailserver2.aws.nh2.me" = {
# Password: also "user1"
hashedPassword = "$6$AsfmuljQlBGtB$/YcnEcCHDiGvhetHud9JFaCzX4ViolNDMS65i8Nw4Uz6XVuzfyDK5/vkjBZ2w7wBacQ5Xn55Mql2vx78FNM7T1";
aliases = [
"postmaster@mailserver2.aws.nh2.me"
];
# Make this user the catchAll address for domains example.com and
# example2.com
catchAll = [
# "example.com"
# "example2.com"
];
};
};
# Extra virtual aliases. These are email addresses that are forwarded to
# loginAccounts addresses.
extraVirtualAliases = {
# address = forward address;
"abuse@example.com" = "user1@mailserver2.aws.nh2.me";
};
# Use Let's Encrypt certificates. Note that this needs to set up a stripped
# down nginx and opens port 80.
certificateScheme = 3;
# Enable IMAP and POP3
enableImap = true;
# enablePop3 = true;
enableImapSsl = true;
# enablePop3Ssl = true;
# Enable the ManageSieve protocol
enableManageSieve = true;
# whether to scan inbound emails for viruses (note that this requires at least
# 1 Gb RAM for the server. Without virus scanning 256 MB RAM should be plenty)
virusScanning = false;
};
services.postfix.config = {
# Make the mailserver send outgoing email only via the floating addresses
# so that we have stable IPs that we can publish in our SPF entry.
"smtp_bind_address" = floatingIPv4;
"smtp_bind_address6" = floatingIPv6;
};
# Make Redis listen to loopback only, see https://github.com/NixOS/nixpkgs/issues/100192.
# TODO: Remove when https://github.com/NixOS/nixpkgs/pull/100195 is merged.
services.redis.bind = "127.0.0.1";
# LetsEncrypt
security.acme.email = "mail@nh2.me";
security.acme.acceptTerms = true;
}
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