62 lines
2.2 KiB
Nix
62 lines
2.2 KiB
Nix
{...}: {
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boot.kernelModules = ["tcp_bbr"];
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boot.kernel.sysctl = {
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### https://madaidans-insecurities.github.io/guides/linux-hardening.html#sysctl
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# Kernel self-protection
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"kernel.kptr_restrict" = "2";
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"kernel.dmesg_restrict" = "1";
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"kernel.printk" = "3 3 3 3"; #
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"kernel.unprivileged_bpf_disabled" = "1";
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"net.core.bpf_jit_harden" = "2";
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"dev.tty.ldisc_autoload" = "0";
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"vm.unprivileged_userfaultfd" = "0";
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"kernel.kexec_load_disabled" = "1";
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"kernel.sysrq" = "4"; #
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#"kernel.unprivileged_userns_clone" = "0"; # does not exist on nixos
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"kernel.perf_event_paranoid" = "3";
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# Network
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"net.ipv4.tcp_syncookies" = "1";
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"net.ipv4.tcp_rfc1337" = "1";
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"net.ipv4.conf.all.rp_filter" = "1";
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"net.ipv4.conf.default.rp_filter" = "1";
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"net.ipv4.conf.all.accept_redirects" = "0";
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"net.ipv4.conf.default.accept_redirects" = "0";
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"net.ipv4.conf.all.secure_redirects" = "0";
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"net.ipv4.conf.default.secure_redirects" = "0";
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"net.ipv6.conf.all.accept_redirects" = "0";
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"net.ipv6.conf.default.accept_redirects" = "0";
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"net.ipv4.conf.all.send_redirects" = "0";
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"net.ipv4.conf.default.send_redirects" = "0";
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"net.ipv4.icmp_echo_ignore_all" = "1";
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"net.ipv4.conf.all.accept_source_route" = "0";
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"net.ipv4.conf.default.accept_source_route" = "0";
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"net.ipv6.conf.all.accept_source_route" = "0";
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"net.ipv6.conf.default.accept_source_route" = "0";
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"net.ipv6.conf.all.accept_ra" = "0";
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"net.ipv6.conf.default.accept_ra" = "0";
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"net.ipv4.tcp_sack" = "0";
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"net.ipv4.tcp_dsack" = "0";
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"net.ipv4.tcp_fack" = "0";
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# User Space
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"kernel.yama.ptrace_scope" = "2";
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"vm.mmap_rnd_bits" = "32";
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"vm.mmap_rnd_compat_bits" = "16";
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"fs.protected_symlinks" = "1";
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"fs.protected_hardlinks" = "1";
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"fs.protected_fifos" = "2";
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"fs.protected_regular" = "2";
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### https://wiki.archlinux.org/title/Sysctl#Improving_performance
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"net.ipv4.tcp_fastopen" = "3";
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"net.ipv4.tcp_keepalive_time" = "80";
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"net.ipv4.tcp_keepalive_intvl" = "10";
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"net.ipv4.tcp_keepalive_probes" = "6";
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"net.ipv4.tcp_mtu_probing" = "1";
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"net.core.default_qdisc" = "cake";
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"net.ipv4.tcp_congestion_control" = "bbr";
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};
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}
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