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update security options

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This commit is contained in:
Cyryl Płotnicki 2022-01-15 10:18:49 +00:00
parent 742bc9c1df
commit f0069d03cc
1 changed files with 28 additions and 1 deletions
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29
nixos/security.nix
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@ -1,4 +1,4 @@
{ config, pkgs, ... }:
{ config, pkgs, lib, ... }:
{
nix.allowedUsers = [ "@users" ];
security.lockKernelModules = false;
@ -6,16 +6,21 @@
security.forcePageTableIsolation = true;
security.virtualisation.flushL1DataCache = "always";
security.apparmor.enable = true;
security.apparmor.killUnconfinedConfinables = true;
services.haveged.enable = true;
networking.firewall.enable = true;
services.clamav.daemon.enable = true;
services.clamav.updater.enable = true;
security.chromiumSuidSandbox.enable = true;
boot.kernelParams = [
"slub_debug=FZP"
"page_poison=1"
"page_alloc.shuffle=1"
];
environment.memoryAllocator.provider = "scudo";
environment.variables.SCUDO_OPTIONS = "ZeroContents=1";
boot.blacklistedKernelModules = [
# Obscure network protocols
"ax25"
@ -38,25 +43,47 @@
"jfs"
"minix"
"nilfs2"
"omfs"
"qnx4"
"qnx6"
"sysv"
"ufs"
];
# 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;
}