diff --git a/modules/security.nix b/modules/security.nix index c4db9ad..32fbd61 100755 --- a/modules/security.nix +++ b/modules/security.nix @@ -13,40 +13,40 @@ in { 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; + kernel.sysctl = { + # magic sysrq key, allows low-level commands through keyboard input + "kernel.sysrq" = 0; - ## 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 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_conjestion_control" = "bbr"; - "net.core.default_qdisc" = "cake"; - }; - kernelModules = [ "tcp_bbr" ]; + ## 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"; }; + kernelModules = [ "tcp_bbr" ]; + }; security = { # prevents replacing the kernel without a reboot @@ -59,6 +59,8 @@ in { # personal computer? no firewall ty :3 networking.firewall.enable = false; + + # TODO: usbguard } // (mkIf cfg.useDoas { security.sudo.enable = false; security.doas.enable = true;