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some reorganizing

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xunuwu 2025-01-16 10:08:58 +01:00
parent df9e8ae8bf
commit 113e015135
Signed by: xun
SSH key fingerprint: SHA256:Uot/1WoAjWAeqLOHA5vYy4phhVydsH7jCPmBjaPZfgI
182 changed files with 443 additions and 449 deletions
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65
sys/profiles/core/security.nix Normal file
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# security tweaks borrowed from @hlissner
{
boot.kernel.sysctl = {
# The Magic SysRq key is a key combo that allows users connected to the
# system console of a Linux kernel to perform some low-level commands.
# Disable it, since we don't need it, and is a potential security concern.
"kernel.sysrq" = 0;
## TCP hardening
# Prevent bogus ICMP errors from filling up logs.
"net.ipv4.icmp_ignore_bogus_error_responses" = 1;
# Reverse path filtering causes the kernel to do source validation of
# packets received from all interfaces. This can mitigate IP spoofing.
"net.ipv4.conf.default.rp_filter" = 1;
"net.ipv4.conf.all.rp_filter" = 1;
# Do not accept IP source route packets (we're not a router)
"net.ipv4.conf.all.accept_source_route" = 0;
"net.ipv6.conf.all.accept_source_route" = 0;
# Don't send ICMP redirects (again, we're not a router)
"net.ipv4.conf.all.send_redirects" = 0;
"net.ipv4.conf.default.send_redirects" = 0;
# Refuse ICMP redirects (MITM mitigations)
"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;
# Protects against SYN flood attacks
"net.ipv4.tcp_syncookies" = 1;
# Incomplete protection again TIME-WAIT assassination
"net.ipv4.tcp_rfc1337" = 1;
## TCP optimization
# TCP Fast Open is a TCP extension that reduces network latency by packing
# data in the sender’s initial TCP SYN. Setting 3 = enable TCP Fast Open for
# both incoming and outgoing connections:
"net.ipv4.tcp_fastopen" = 3;
# Bufferbloat mitigations + slight improvement in throughput & latency
"net.ipv4.tcp_congestion_control" = "bbr";
"net.core.default_qdisc" = "cake";
};
boot.kernelModules = ["tcp_bbr"];
# Change me later!
#users.users.root.initialPassword = "nixos";
security = {
# allow wayland lockers to unlock the screen
pam.services.swaylock.text = "auth include login";
# userland niceness
rtkit.enable = true;
# don't ask for password for wheel group
sudo.wheelNeedsPassword = false;
# allow running as any id without them being listed in /etc/passwd
# this might be a security problem but whatever
sudo.extraConfig = ''
Defaults runas_allow_unknown_id
'';
};
}