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google-compute-config.nix: use sysctl snippets from gce

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We make them available at ${gce}/sysctl.d and add them to
environments.etc, like we do with the systemd ones.
This commit is contained in:
Florian Klink 2019-09-01 02:55:28 +02:00
parent d658dd4ce0
commit e95d4c734a
2 changed files with 5 additions and 77 deletions
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78
nixos/modules/virtualisation/google-compute-config.nix
View file

@ -144,81 +144,5 @@ in
wantedBy = [ "multi-user.target" ];
};
# Settings taken from https://github.com/GoogleCloudPlatform/compute-image-packages/blob/master/google_config/sysctl/11-gce-network-security.conf
boot.kernel.sysctl = {
# Turn on SYN-flood protections. Starting with 2.6.26, there is no loss
# of TCP functionality/features under normal conditions. When flood
# protections kick in under high unanswered-SYN load, the system
# should remain more stable, with a trade off of some loss of TCP
# functionality/features (e.g. TCP Window scaling).
"net.ipv4.tcp_syncookies" = mkDefault "1";
# ignores ICMP redirects
"net.ipv4.conf.all.accept_redirects" = mkDefault "0";
# ignores ICMP redirects
"net.ipv4.conf.default.accept_redirects" = mkDefault "0";
# ignores ICMP redirects from non-GW hosts
"net.ipv4.conf.all.secure_redirects" = mkDefault "1";
# ignores ICMP redirects from non-GW hosts
"net.ipv4.conf.default.secure_redirects" = mkDefault "1";
# don't allow traffic between networks or act as a router
"net.ipv4.ip_forward" = mkDefault "0";
# don't allow traffic between networks or act as a router
"net.ipv4.conf.all.send_redirects" = mkDefault "0";
# don't allow traffic between networks or act as a router
"net.ipv4.conf.default.send_redirects" = mkDefault "0";
# strict reverse path filtering - IP spoofing protection
"net.ipv4.conf.all.rp_filter" = mkDefault "1";
# strict path filtering - IP spoofing protection
"net.ipv4.conf.default.rp_filter" = mkDefault "1";
# ignores ICMP broadcasts to avoid participating in Smurf attacks
"net.ipv4.icmp_echo_ignore_broadcasts" = mkDefault "1";
# ignores bad ICMP errors
"net.ipv4.icmp_ignore_bogus_error_responses" = mkDefault "1";
# logs spoofed, source-routed, and redirect packets
"net.ipv4.conf.all.log_martians" = mkDefault "1";
# log spoofed, source-routed, and redirect packets
"net.ipv4.conf.default.log_martians" = mkDefault "1";
# implements RFC 1337 fix
"net.ipv4.tcp_rfc1337" = mkDefault "1";
# randomizes addresses of mmap base, heap, stack and VDSO page
"kernel.randomize_va_space" = mkDefault "2";
# Reboot the machine soon after a kernel panic.
"kernel.panic" = mkDefault "10";
## Not part of the original config
# provides protection from ToCToU races
"fs.protected_hardlinks" = mkDefault "1";
# provides protection from ToCToU races
"fs.protected_symlinks" = mkDefault "1";
# makes locating kernel addresses more difficult
"kernel.kptr_restrict" = mkDefault "1";
# set ptrace protections
"kernel.yama.ptrace_scope" = mkOverride 500 "1";
# set perf only available to root
"kernel.perf_event_paranoid" = mkDefault "2";
};
environment.etc."sysctl.d/11-gce-network-security.conf".source = "${gce}/sysctl.d/11-gce-network-security.conf";
}

4
pkgs/tools/virtualization/google-compute-engine/default.nix
View file

@ -46,6 +46,10 @@ buildPythonApplication rec {
mkdir -p $out/lib/udev/rules.d
cp -r google_config/udev/*.rules $out/lib/udev/rules.d
# sysctl snippets will be used by google-compute-config.nix
mkdir -p $out/sysctl.d
cp google_config/sysctl/*.conf $out/sysctl.d
patchShebangs $out/bin/*
'';