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more sysd hardening

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Grimmauld 2025-01-07 11:31:43 +01:00
parent 8f68278465
commit cf98a8a221
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12 changed files with 225 additions and 44 deletions
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2
hardening/systemd/NetworkManager.nix
View file

@ -25,7 +25,6 @@
# PrivateUsers = true; # BAD
# ProtectKernelTunables = true; # BAD
ProtectHostname=true;
ProcSubset = "pid";
ProtectSystem = true;
};
@ -55,7 +54,6 @@
# PrivateUsers = true; # BAD
# ProtectKernelTunables = true; # BAD
ProtectHostname=true;
ProcSubset = "pid";
ProtectSystem = true;
};

1
hardening/systemd/acpid.nix
View file

@ -15,7 +15,6 @@
SystemCallArchitectures = "native";
SystemCallFilter = "@system-service";
LockPersonality = true;
ProtectHostname=true;
ProtectSystem = true;
PrivateUsers = true;
PrivateNetwork = true;

41
hardening/systemd/ask-password.nix Normal file
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@ -0,0 +1,41 @@
{ lib, config, ... }:
{
config.systemd.services = lib.mkIf (config.specialisation != { }) {
systemd-ask-password-console.serviceConfig = {
CapabilityBoundingSet = [
""
];
NoNewPrivileges = true;
RestrictNamespaces = "pid";
ProtectControlGroups = true;
ProtectKernelModules = true;
ProtectKernelTunables = true;
MemoryDenyWriteExecute = true;
RestrictSUIDSGID = true;
SystemCallArchitectures = "native";
SystemCallFilter = "@system-service";
LockPersonality = true;
RestrictRealtime = true;
ProtectProc = "invisible";
PrivateUsers = true;
};
systemd-ask-password-wall.serviceConfig = {
CapabilityBoundingSet = [
""
];
NoNewPrivileges = true;
RestrictNamespaces = "pid";
ProtectControlGroups = true;
ProtectKernelModules = true;
ProtectKernelTunables = true;
MemoryDenyWriteExecute = true;
RestrictSUIDSGID = true;
SystemCallArchitectures = "native";
SystemCallFilter = "@system-service";
LockPersonality = true;
RestrictRealtime = true;
ProtectProc = "invisible";
PrivateUsers = true;
};
};
}

1
hardening/systemd/auditd.nix
View file

@ -12,7 +12,6 @@
SystemCallArchitectures = "native";
SystemCallFilter = "@system-service";
LockPersonality = true;
ProtectHostname=true;
ProtectSystem = true;
# PrivateUsers=true;
# PrivateNetwork=true;

46
hardening/systemd/bluetooth.nix Normal file
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@ -0,0 +1,46 @@
{ lib, config, ... }:
{
config.systemd.services = lib.mkIf (config.specialisation != { }) {
bluetooth.serviceConfig = {
CapabilityBoundingSet = [
""
];
NoNewPrivileges = true;
RestrictNamespaces = "pid";
ProtectControlGroups = true;
ProtectKernelModules = true;
ProtectKernelTunables = true;
MemoryDenyWriteExecute = true;
RestrictSUIDSGID = true;
SystemCallArchitectures = "native";
SystemCallFilter = "@system-service";
LockPersonality = true;
RestrictRealtime = true;
ProtectProc = "invisible";
PrivateUsers = true;
};
blueman-mechanism.serviceConfig = {
CapabilityBoundingSet = [
""
];
NoNewPrivileges = true;
RestrictNamespaces = "pid";
ProtectControlGroups = true;
ProtectKernelModules = true;
ProtectKernelTunables = true;
MemoryDenyWriteExecute = true;
RestrictSUIDSGID = true;
SystemCallArchitectures = "native";
SystemCallFilter = "@system-service";
LockPersonality = true;
RestrictRealtime = true;
ProtectProc = "invisible";
PrivateUsers = true;
};
};
}

13
hardening/systemd/cups.nix
View file

@ -2,9 +2,10 @@
{
config.systemd.services = lib.mkIf (config.specialisation != { }) {
cups.serviceConfig = {
#CapabilityBoundingSet = [
# ""
#];
CapabilityBoundingSet = [
"CAP_LEASE CAP_MKNOD CAP_SYS_RAWIO CAP_SYS_RESOURCE CAP_NET_BIND_SERVICE CAP_NET_BROADCAST CAP_NET_RAW CAP_SETUID CAP_SETGID"
];
NoNewPrivileges = true;
RestrictNamespaces = "pid";
@ -16,12 +17,12 @@
SystemCallArchitectures = "native";
SystemCallFilter = "@system-service";
LockPersonality = true;
ProtectHostname=true;
RestrictRealtime = true;
ProtectProc = "invisible";
# PrivateUsers=true;
# PrivateNetwork=true;
# RestrictAddressFamilies="AF_UNIX";
PrivateNetwork = true;
RestrictAddressFamilies = "AF_UNIX";
# ProtectSystem=true;
};
};

18
hardening/systemd/default.nix
View file

@ -18,6 +18,11 @@ in
./auditd.nix
./acpid.nix
./cups.nix
./bluetooth.nix
./tty.nix
./ask-password.nix
./global
];
options.systemd.services = lib.mkOption {
@ -38,8 +43,6 @@ in
mkIf (osConfig.specialisation != { }) (
{
ProtectHome = mkDefault true;
ProtectClock = mkDefault true;
# ProtectHostname = mkDefault true;
# LockPersonality = mkIf shouldMakeIntrusive (mkDefault true); # UH OH THIS ONE IS ROUGH!
}
// (lib.optionalAttrs shouldMakeIntrusive {
@ -65,6 +68,7 @@ in
sshd.serviceConfig.ProtectHome = false;
display-manager.serviceConfig.ProtectHome = "read-only";
dbus-broker.serviceConfig.ProtectHome = "read-only";
systemd-logind.serviceConfig.ProtectHome = false;
nix-daemon.serviceConfig.ProtectHome = false;
@ -86,16 +90,6 @@ in
display-manager.serviceConfig.SystemCallFilter = "";
sshd.serviceConfig.SystemCallFilter = "";
rtkit-daemon.serviceConfig.SystemCallFilter = "";
systemd-timesync.serviceConfig = {
ProtectClock = false;
SystemCallFilter = "@system-service @clock";
};
save-hwclock.serviceConfig = {
ProtectClock = false;
SystemCallFilter = "@system-service @clock";
};
};
};
}

37
hardening/systemd/global/clock.nix Normal file
View file

@ -0,0 +1,37 @@
{ lib, config, ... }:
let
inherit (lib) mkDefault types mkIf;
in
{
options.systemd.services = lib.mkOption {
type =
let
osConfig = config;
in
types.attrsOf (
lib.types.submodule (
{ config, name, ... }:
{
config.serviceConfig = mkIf (osConfig.specialisation != { }) {
ProtectClock = mkDefault true;
};
}
)
);
};
config = mkIf (config.specialisation != { }) {
systemd.services = {
systemd-timesyncd.serviceConfig = {
ProtectClock = false;
SystemCallFilter = "@system-service @clock";
};
save-hwclock.serviceConfig = {
ProtectClock = false;
SystemCallFilter = "@system-service @clock";
};
};
};
}

6
hardening/systemd/global/default.nix Normal file
View file

@ -0,0 +1,6 @@
{
imports = [
./hostname.nix
./clock.nix
];
}

29
hardening/systemd/global/hostname.nix Normal file
View file

@ -0,0 +1,29 @@
{ lib, config, ... }:
let
inherit (lib) types mkIf mkDefault;
in
{
options.systemd.services = lib.mkOption {
type =
let
osConfig = config;
in
types.attrsOf (
lib.types.submodule (
{ config, name, ... }:
{
config.serviceConfig = mkIf (osConfig.specialisation != { }) {
ProtectHostname = mkDefault true;
};
}
)
);
};
config = mkIf (config.specialisation != { }) {
systemd.services = {
systemd-hostnamed.serviceConfig.ProtectHostname = false;
nix-daemon.serviceConfig.ProtectHostname = false;
};
};
}

32
hardening/systemd/tty.nix Normal file
View file

@ -0,0 +1,32 @@
{ lib, config, ... }:
{
config.systemd.services = lib.mkIf (config.specialisation != { }) {
"getty@".serviceConfig = {
#CapabilityBoundingSet =[
# "CAP_SYS_TTY_CONFIGCAP_LEASE"
#];
# NoNewPrivileges = true;
RestrictNamespaces = "pid";
ProtectControlGroups = true;
ProtectHome = false;
ProtectClock = false;
ProtectKernelModules = true;
ProtectKernelTunables = true;
MemoryDenyWriteExecute = true;
# RestrictSUIDSGID = true;
SystemCallArchitectures = "native";
SystemCallFilter = lib.mkForce "@system-service";
LockPersonality = true;
#RestrictRealtime=true;
ProtectProc = "invisible";
# PrivateUsers=true;
PrivateNetwork = true;
RestrictAddressFamilies = "AF_UNIX";
# ProtectSystem=true;
};
};
}

1
hardening/systemd/wpa_supplicant.nix
View file

@ -22,7 +22,6 @@
SystemCallFilter = "@system-service";
LockPersonality = true;
ProtectHostname=true;
ProcSubset = "pid";
ProtectSystem = true;
};