91 lines
2.7 KiB
Nix
91 lines
2.7 KiB
Nix
{
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config,
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pkgs,
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lib,
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...
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}: {
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networking.firewall.checkReversePath = "loose";
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networking.firewall.enable = true;
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nix.settings.allowed-users = ["@users"];
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security.apparmor.enable = true;
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security.apparmor.killUnconfinedConfinables = true;
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security.forcePageTableIsolation = true;
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security.lockKernelModules = false;
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security.protectKernelImage = true;
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security.virtualisation.flushL1DataCache = "always";
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sops.age = {
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keyFile = "/var/lib/sops-nix/key.txt";
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generateKey = true;
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};
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boot.kernelParams = ["slub_debug=FZP" "page_poison=1" "page_alloc.shuffle=1"];
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boot.blacklistedKernelModules = [
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# Obscure network protocols
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"ax25"
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"netrom"
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"rose"
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# Old or rare or insufficiently audited filesystems
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"adfs"
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"affs"
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"bfs"
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"befs"
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"cramfs"
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"efs"
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"erofs"
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"exofs"
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"freevxfs"
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"f2fs"
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"hfs"
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"hpfs"
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"jfs"
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"minix"
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"nilfs2"
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"omfs"
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"qnx4"
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"qnx6"
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"sysv"
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"ufs"
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];
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# Restrict ptrace() usage to processes with a pre-defined relationship
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# (e.g., parent/child)
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boot.kernel.sysctl."kernel.yama.ptrace_scope" = lib.mkOverride 500 1;
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# Hide kptrs even for processes with CAP_SYSLOG
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boot.kernel.sysctl."kernel.kptr_restrict" = lib.mkOverride 500 2;
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# Disable bpf() JIT (to eliminate spray attacks)
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boot.kernel.sysctl."net.core.bpf_jit_enable" = false;
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# Disable ftrace debugging
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boot.kernel.sysctl."kernel.ftrace_enabled" = false;
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# Enable strict reverse path filtering (that is, do not attempt to route
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# packets that "obviously" do not belong to the iface's network; dropped
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# packets are logged as martians).
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boot.kernel.sysctl."net.ipv4.conf.all.log_martians" = true;
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boot.kernel.sysctl."net.ipv4.conf.all.rp_filter" = "1";
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boot.kernel.sysctl."net.ipv4.conf.default.log_martians" = true;
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boot.kernel.sysctl."net.ipv4.conf.default.rp_filter" = "1";
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# Ignore broadcast ICMP (mitigate SMURF)
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boot.kernel.sysctl."net.ipv4.icmp_echo_ignore_broadcasts" = true;
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# Ignore incoming ICMP redirects (note: default is needed to ensure that the
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# setting is applied to interfaces added after the sysctls are set)
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boot.kernel.sysctl."net.ipv4.conf.all.accept_redirects" = false;
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boot.kernel.sysctl."net.ipv4.conf.all.secure_redirects" = false;
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boot.kernel.sysctl."net.ipv4.conf.default.accept_redirects" = false;
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boot.kernel.sysctl."net.ipv4.conf.default.secure_redirects" = false;
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boot.kernel.sysctl."net.ipv6.conf.all.accept_redirects" = false;
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boot.kernel.sysctl."net.ipv6.conf.default.accept_redirects" = false;
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# Ignore outgoing ICMP redirects (this is ipv4 only)
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boot.kernel.sysctl."net.ipv4.conf.all.send_redirects" = false;
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boot.kernel.sysctl."net.ipv4.conf.default.send_redirects" = false;
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}
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