43 lines
1.3 KiB
Nix
43 lines
1.3 KiB
Nix
# A profile with most (vanilla) hardening options enabled by default,
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# potentially at the cost of features and performance.
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{ config, lib, pkgs, ... }:
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with lib;
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{
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security.hideProcessInformation = mkDefault true;
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security.lockKernelModules = mkDefault true;
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security.apparmor.enable = mkDefault true;
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boot.kernelParams = [
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# Disable legacy virtual syscalls
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"vsyscall=none"
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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" = mkOverride 500 1;
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# Prevent replacing the running kernel image w/o reboot
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boot.kernel.sysctl."kernel.kexec_load_disabled" = mkDefault true;
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# Restrict access to kernel ring buffer (information leaks)
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boot.kernel.sysctl."kernel.dmesg_restrict" = mkDefault true;
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# Hide kptrs even for processes with CAP_SYSLOG
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boot.kernel.sysctl."kernel.kptr_restrict" = mkOverride 500 2;
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# Unprivileged access to bpf() has been used for privilege escalation in
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# the past
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boot.kernel.sysctl."kernel.unprivileged_bpf_disabled" = mkDefault true;
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# Disable bpf() JIT (to eliminate spray attacks)
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boot.kernel.sysctl."net.core.bpf_jit_enable" = mkDefault false;
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# ... or at least apply some hardening to it
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boot.kernel.sysctl."net.core.bpf_jit_harden" = mkDefault true;
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}
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