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{
pkgs,
lib,
config,
inputs,
...
}: {
imports = [];
config = {
security.auditd.enable = true;
security.audit.enable = true;
security.audit.rules = [
"-a exit,always -F arch=b64 -S execve"
];
environment.memoryAllocator.provider = "scudo";
environment.variables.SCUDO_OPTIONS = "ZeroContents=1";
security.lockKernelModules = true;
security.protectKernelImage = true;
security.allowSimultaneousMultithreading = false;
security.forcePageTableIsolation = true;
security.unprivilegedUsernsClone = config.virtualisation.containers.enable;
security.virtualisation.flushL1DataCache = "always";
security.apparmor.enable = true;
security.apparmor.killUnconfinedConfinables = true;
# Restrict ptrace() usage to processes with a pre-defined relationship
# (e.g., parent/child)
boot.kernel.sysctl."kernel.yama.ptrace_scope" = lib.mkOverride 500 1;
# Hide kptrs even for processes with CAP_SYSLOG
boot.kernel.sysctl."kernel.kptr_restrict" = lib.mkOverride 500 2;
# Disable bpf() JIT (to eliminate spray attacks)
boot.kernel.sysctl."net.core.bpf_jit_enable" = false;
# Disable ftrace debugging
boot.kernel.sysctl."kernel.ftrace_enabled" = false;
# Enable strict reverse path filtering (that is, do not attempt to route
# packets that "obviously" do not belong to the iface's network; dropped
# packets are logged as martians).
boot.kernel.sysctl."net.ipv4.conf.all.log_martians" = true;
boot.kernel.sysctl."net.ipv4.conf.all.rp_filter" = "1";
boot.kernel.sysctl."net.ipv4.conf.default.log_martians" = true;
boot.kernel.sysctl."net.ipv4.conf.default.rp_filter" = "1";
# Ignore broadcast ICMP (mitigate SMURF)
boot.kernel.sysctl."net.ipv4.icmp_echo_ignore_broadcasts" = true;
# Ignore incoming ICMP redirects (note: default is needed to ensure that the
# setting is applied to interfaces added after the sysctls are set)
boot.kernel.sysctl."net.ipv4.conf.all.accept_redirects" = false;
boot.kernel.sysctl."net.ipv4.conf.all.secure_redirects" = false;
boot.kernel.sysctl."net.ipv4.conf.default.accept_redirects" = false;
boot.kernel.sysctl."net.ipv4.conf.default.secure_redirects" = false;
boot.kernel.sysctl."net.ipv6.conf.all.accept_redirects" = false;
boot.kernel.sysctl."net.ipv6.conf.default.accept_redirects" = false;
# Ignore outgoing ICMP redirects (this is ipv4 only)
boot.kernel.sysctl."net.ipv4.conf.all.send_redirects" = false;
boot.kernel.sysctl."net.ipv4.conf.default.send_redirects" = false;
security.chromiumSuidSandbox.enable = true;
security.sudo.execWheelOnly = true;
security.sudo.extraConfig = "Defaults lecture = never";
};
}
|
