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simplify enable opts, and fix security.nix

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Reid 2024-02-28 19:02:34 -08:00
parent 06b42a1aa6
commit 5d5cd7979c
10 changed files with 34 additions and 40 deletions
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28
modules/security.nix
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@ -14,24 +14,38 @@ in {
tmp.cleanOnBoot = lib.mkDefault (!config.boot.tmp.useTmpfs);
kernel.sysctl = {
# magic sysrq key, allows low-level commands through keyboard input
"kernel.sysrq" = 0;
"net.ipv4.conf.all.accept_source_code" = 0;
"net.ipv6.conf.all.accept_source_code" = 0;
"net.ipv4.conf.default.send_redirects" = 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.accept_redirects" = 0;
"net.ipv4.conf.default.send_redirects" = 0;
# refuse ICMP redirects (MITM mitigations)
"net.ipv4.conf.all.accept_redirects" = 0;
"net.ipv6.conf.default.accept_redirects" = 0;
"net.ipv6.conf.all.accept_redirects" = 0;
"net.ipv4.conf.default.secure_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" ];
};
security = {