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Reid 2026-04-01 22:24:48 -07:00
parent 90572a1ff0
commit 4304b5c887
Signed by: reidlab
GPG key ID: DAF5EAF6665839FD
2 changed files with 61 additions and 52 deletions
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111
modules/security.nix
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@ -8,62 +8,71 @@ in {
useDoas = mkEnableOption "use opendoas instead of sudo";
};
config = mkIf cfg.enable {
boot = {
tmp.useTmpfs = lib.mkDefault true;
tmp.cleanOnBoot = lib.mkDefault (!config.boot.tmp.useTmpfs);
config = mkMerge [
{
boot = {
tmp.useTmpfs = lib.mkDefault true;
tmp.cleanOnBoot = lib.mkDefault (!config.boot.tmp.useTmpfs);
kernel.sysctl = {
# magic sysrq key, allows low-level commands through keyboard input
"kernel.sysrq" = 0;
# disable kernel parameter editing on boot
loader.systemd-boot.editor = false;
## TCP hardening
# prevent bogus ICMP errors from filling up logs
"net.ipv4.icmp_ignore_bogus_error_responses" = 1;
# do not accept IP source packets (we are 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 not 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 against TIME-WAIT assassination
"net.ipv4.tcp_rfc1337" = 1;
kernel.sysctl = {
# magic sysrq key, allows low-level commands through keyboard input
"kernel.sysrq" = 0;
## TCP optimization
# TCP fastopen
"net.ipv4.tcp_fastopen" = 3;
# bufferbloat mitigations + improvement in throughput and latency
"net.ipv4.tcp_conjestion_control" = "bbr";
"net.core.default_qdisc" = "cake";
## TCP hardening
# prevent bogus ICMP errors from filling up logs
"net.ipv4.icmp_ignore_bogus_error_responses" = 1;
# do not accept IP source packets (we are 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 not 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 against TIME-WAIT assassination
"net.ipv4.tcp_rfc1337" = 1;
## TCP optimization
# TCP fastopen
"net.ipv4.tcp_fastopen" = 3;
# bufferbloat mitigations + improvement in throughput and latency
"net.ipv4.tcp_congestion_control" = "bbr";
"net.core.default_qdisc" = "cake";
};
kernelModules = [ "tcp_bbr" ];
};
kernelModules = [ "tcp_bbr" ];
};
security = {
# prevents replacing the kernel without a reboot
protectKernelImage = true;
# rtkit allows unprivileged processes to use realtime scheduling
# polkit allows unprivileged processes to speak to privileged processes (ex. nmtui, reboot)
rtkit.enable = true;
polkit.enable = true;
};
security = {
# prevents replacing the kernel without a reboot
protectKernelImage = true;
# rtkit allows unprivileged processes to use realtime scheduling
# polkit allows unprivileged processes to speak to privileged processes (ex. nmtui, reboot)
rtkit.enable = true;
polkit.enable = true;
};
# while this is on by default, i am going to explicitly specify this
networking.firewall.enable = true;
# while this is on by default, i am going to explicitly specify this
networking.firewall.enable = true;
services.fwupd.enable = true;
} // (mkIf cfg.useDoas {
security.sudo.enable = false;
security.doas.enable = true;
environment.systemPackages = with pkgs; [ doas-sudo-shim ];
});
services.fwupd.enable = true;
}
(mkIf cfg.useDoas {
security.sudo.enable = false;
security.doas.enable = true;
security.doas.extraRules = [
{ users = [ config.user.name ]; noPass = true; persist = false; keepEnv = true; }
];
environment.systemPackages = with pkgs; [ doas-sudo-shim ];
})
];
}