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some hardening

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This commit is contained in:
Henri Dohmen 2025-07-14 16:36:10 +02:00
parent ffe40ca5e7
commit fc85e43c82
4 changed files with 32 additions and 7 deletions
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30
common/security.nix
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@ -5,8 +5,38 @@
...
}:
{
boot = {
kernel.sysctl = {
"net.ipv4.icmp_ignore_bogus_error_responses" = 1;
"net.ipv4.conf.default.rp_filter" = 1;
"net.ipv4.conf.all.rp_filter" = 1;
"net.ipv4.conf.all.accept_source_route" = 0;
"net.ipv6.conf.all.accept_source_route" = 0;
"net.ipv4.conf.all.send_redirects" = 0;
"net.ipv4.conf.default.send_redirects" = 0;
"net.ipv4.conf.all.accept_redirects" = 0;
"net.ipv4.conf.default.accept_redirects" = 0;
"net.ipv4.conf.all.secure_redirects" = 0;
"net.ipv4.conf.default.secure_redirects" = 0;
"net.ipv6.conf.all.accept_redirects" = 0;
"net.ipv6.conf.default.accept_redirects" = 0;
"net.ipv4.tcp_syncookies" = 1;
"net.ipv4.tcp_rfc1337" = 1;
"net.ipv4.tcp_fastopen" = 3;
};
# otherwise /tmp is on disk. This *may* be problematic as nix
# builds in /tmp but I think my swap is large enough...
tmp.useTmpfs = lib.mkDefault true;
tmp.cleanOnBoot = lib.mkDefault (!config.boot.tmp.useTmpfs);
};
security = {
protectKernelImage = true;
sudo.enable = false;
doas = {
enable = true;