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Reid 2026-04-01 22:24:48 -07:00
parent 90572a1ff0
commit 88175e8faa
Signed by: reidlab
GPG key ID: DAF5EAF6665839FD
1 changed files with 33 additions and 33 deletions
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66
modules/security.nix
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@ -8,42 +8,42 @@ in {
useDoas = mkEnableOption "use opendoas instead of sudo"; useDoas = mkEnableOption "use opendoas instead of sudo";
}; };
config = mkIf cfg.enable { config = {
boot = { boot = {
tmp.useTmpfs = lib.mkDefault true; tmp.useTmpfs = lib.mkDefault true;
tmp.cleanOnBoot = lib.mkDefault (!config.boot.tmp.useTmpfs); tmp.cleanOnBoot = lib.mkDefault (!config.boot.tmp.useTmpfs);
kernel.sysctl = { kernel.sysctl = {
# magic sysrq key, allows low-level commands through keyboard input # magic sysrq key, allows low-level commands through keyboard input
"kernel.sysrq" = 0; "kernel.sysrq" = 0;
## TCP hardening ## TCP hardening
# prevent bogus ICMP errors from filling up logs # prevent bogus ICMP errors from filling up logs
"net.ipv4.icmp_ignore_bogus_error_responses" = 1; "net.ipv4.icmp_ignore_bogus_error_responses" = 1;
# do not accept IP source packets (we are not a router) # do not accept IP source packets (we are not a router)
"net.ipv4.conf.all.accept_source_route" = 0; "net.ipv4.conf.all.accept_source_route" = 0;
"net.ipv6.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) # don't send ICMP redirects (again, we're not a router)
"net.ipv4.conf.all.send_redirects" = 0; "net.ipv4.conf.all.send_redirects" = 0;
"net.ipv4.conf.default.send_redirects" = 0; "net.ipv4.conf.default.send_redirects" = 0;
# refuse ICMP redirects (MITM mitigations) # refuse ICMP redirects (MITM mitigations)
"net.ipv4.conf.all.accept_redirects" = 0; "net.ipv4.conf.all.accept_redirects" = 0;
"net.ipv4.conf.default.accept_redirects" = 0; "net.ipv4.conf.default.accept_redirects" = 0;
"net.ipv4.conf.all.secure_redirects" = 0; "net.ipv4.conf.all.secure_redirects" = 0;
"net.ipv4.conf.default.secure_redirects" = 0; "net.ipv4.conf.default.secure_redirects" = 0;
"net.ipv6.conf.all.accept_redirects" = 0; "net.ipv6.conf.all.accept_redirects" = 0;
"net.ipv6.conf.default.accept_redirects" = 0; "net.ipv6.conf.default.accept_redirects" = 0;
# protects against SYN flood attacks # protects against SYN flood attacks
"net.ipv4.tcp_syncookies" = 1; "net.ipv4.tcp_syncookies" = 1;
# incomplete protection against TIME-WAIT assassination # incomplete protection against TIME-WAIT assassination
"net.ipv4.tcp_rfc1337" = 1; "net.ipv4.tcp_rfc1337" = 1;
## TCP optimization ## TCP optimization
# TCP fastopen # TCP fastopen
"net.ipv4.tcp_fastopen" = 3; "net.ipv4.tcp_fastopen" = 3;
# bufferbloat mitigations + improvement in throughput and latency # bufferbloat mitigations + improvement in throughput and latency
"net.ipv4.tcp_conjestion_control" = "bbr"; "net.ipv4.tcp_conjestion_control" = "bbr";
"net.core.default_qdisc" = "cake"; "net.core.default_qdisc" = "cake";
}; };
kernelModules = [ "tcp_bbr" ]; kernelModules = [ "tcp_bbr" ];
}; };