dotfiles/modules/security/default.nix

{ config
, lib
, ...
}: {
  ## System security tweaks
  # Prevent replacing the running kernel w/o reboot
  # security.protectKernelImage = lib.mkDefault true; # NOTE disabled for now to enable hibernate

  # tmpfs = /tmp is mounted in ram. Doing so makes temp file management speedy
  # on ssd systems, and volatile! Because it's wiped on reboot.
  boot.tmp.useTmpfs = lib.mkDefault true;
  # If not using tmpfs, which is naturally purged on reboot, we must clean it
  # /tmp ourselves. /tmp should be volatile storage!
  boot.tmp.cleanOnBoot = lib.mkDefault (!config.boot.tmp.useTmpfs);

  # Fix a security hole in place for backwards compatibility. See desc in
  # nixpkgs/nixos/modules/system/boot/loader/systemd-boot/systemd-boot.nix
  boot.loader.systemd-boot.editor = false;

  boot.kernel.sysctl = {
    # The Magic SysRq key is a key combo that allows users connected to the
    # system console of a Linux kernel to perform some low-level commands.
    # Disable it, since we don't need it, and is a potential security concern.
    "kernel.sysrq" = 0;

    ## TCP hardening
    # Prevent bogus ICMP errors from filling up logs.
    "net.ipv4.icmp_ignore_bogus_error_responses" = 1;
    # Reverse path filtering causes the kernel to do source validation of
    # packets received from all interfaces. This can mitigate IP spoofing.
    "net.ipv4.conf.default.rp_filter" = 1;
    "net.ipv4.conf.all.rp_filter" = 1;
    # Do not accept IP source route packets (we're not a router)
    "net.ipv4.conf.all.accept_source_route" = 0;
    "net.ipv6.conf.all.accept_source_route" = 0;
    # Don't send ICMP redirects (again, we're on a router)
    "net.ipv4.conf.all.send_redirects" = 0;
    "net.ipv4.conf.default.send_redirects" = 0;
    # Refuse ICMP redirects (MITM mitigations)
    "net.ipv4.conf.all.accept_redirects" = 0;
    "net.ipv4.conf.default.accept_redirects" = 0;
    "net.ipv4.conf.all.secure_redirects" = 0;
    "net.ipv4.conf.default.secure_redirects" = 0;
    "net.ipv6.conf.all.accept_redirects" = 0;
    "net.ipv6.conf.default.accept_redirects" = 0;
    # Protects against SYN flood attacks
    "net.ipv4.tcp_syncookies" = 1;
    # Incomplete protection again TIME-WAIT assassination
    "net.ipv4.tcp_rfc1337" = 1;
    # Log martian packages
    "net.ipv4.conf.all.log_martians" = 1;
    "net.ipv4.conf.default.log_martians" = 1;

    ## TCP optimization
    # TCP Fast Open is a TCP extension that reduces network latency by packing
    # data in the sender’s initial TCP SYN. Setting 3 = enable TCP Fast Open for
    # both incoming and outgoing connections:
    "net.ipv4.tcp_fastopen" = 3;
    # Bufferbloat mitigations + slight improvement in throughput & latency
    "net.ipv4.tcp_congestion_control" = "bbr";
    "net.core.default_qdisc" = "cake";
  };
  boot.kernelModules = [ "tcp_bbr" ];

  # So we don't have to do this later...
  security.acme.acceptTerms = true;

  # SSH
  services.openssh = {
    settings = {
      # Disable ssh password login
      passwordAuthentication = lib.mkDefault false;
      logLevel = "VERBOSE";
    };
    extraConfig = ''
      AllowAgentForwarding no
      AllowTcpForwarding no
      ClientAliveCountMax 2
      Compression no
      MaxAuthTries 3
      MaxSessions 2
      TCPKeepAlive no
    '';
  };
}