netns-isolation: netns architecture
- Adds network namespace instantiation and routing architecture. - netns-isolation disabled by default. Can be enabled with configuration.nix FIXME. - Uses mkMerge to toggle certain options for non netns and netns systems. - Adds security wrapper for netns-exec which allows operator to exec with cap_sys_admin - User can select the 169.254.N.0/24 addressblock netns's are created in. - nix-bitcoin-services IpAddressAllow is amended with link-local addresses
This commit is contained in:
nixbitcoin
parent
4a7199a3da
commit
e5e07b91f7
|
|
@ -117,6 +117,13 @@
|
|||
# `docs/usage.md`.
|
||||
# services.hardware-wallets.trezor = true;
|
||||
|
||||
### netns-isolation (EXPERIMENTAL)
|
||||
# Enable this module to use Network Namespace Isolation. This feature places
|
||||
# every service in its own network namespace and only allows truly necessary
|
||||
# connections between network namespaces, making sure services are isolated on
|
||||
# a network-level as much as possible.
|
||||
# nix-bitcoin.netns-isolation.enable = true;
|
||||
|
||||
# FIXME: Define your hostname.
|
||||
networking.hostName = "nix-bitcoin";
|
||||
time.timeZone = "UTC";
|
||||
|
|
|
|||
|
|
@ -14,6 +14,7 @@
|
|||
./hardware-wallets.nix
|
||||
./lnd.nix
|
||||
./secrets/secrets.nix
|
||||
./netns-isolation.nix
|
||||
];
|
||||
|
||||
disabledModules = [ "services/networking/bitcoind.nix" ];
|
||||
|
|
|
|||
167
modules/netns-isolation.nix
Normal file
167
modules/netns-isolation.nix
Normal file
|
|
@ -0,0 +1,167 @@
|
|||
{ config, lib, pkgs, ... }:
|
||||
|
||||
with lib;
|
||||
|
||||
let
|
||||
cfg = config.nix-bitcoin.netns-isolation;
|
||||
|
||||
netns = builtins.mapAttrs (n: v: {
|
||||
inherit (v) id;
|
||||
address = "169.254.${toString cfg.addressblock}.${toString v.id}";
|
||||
availableNetns = builtins.filter isEnabled availableNetns.${n};
|
||||
}) enabledServices;
|
||||
|
||||
# Symmetric netns connection matrix
|
||||
# if clightning.connections = [ "bitcoind" ]; then
|
||||
# availableNetns.bitcoind = [ "clighting" ];
|
||||
# and
|
||||
# availableNetns.clighting = [ "bitcoind" ];
|
||||
availableNetns = let
|
||||
# base = { clightning = [ "bitcoind" ]; ... }
|
||||
base = builtins.mapAttrs (n: v:
|
||||
builtins.filter isEnabled v.connections
|
||||
) enabledServices;
|
||||
in
|
||||
foldl (xs: s1:
|
||||
foldl (xs: s2:
|
||||
xs // { "${s2}" = xs.${s2} ++ [ s1 ]; }
|
||||
) xs cfg.services.${s1}.connections
|
||||
) base (builtins.attrNames base);
|
||||
|
||||
enabledServices = filterAttrs (n: v: isEnabled n) cfg.services;
|
||||
isEnabled = x: config.services.${x}.enable;
|
||||
|
||||
ip = "${pkgs.iproute}/bin/ip";
|
||||
iptables = "${config.networking.firewall.package}/bin/iptables";
|
||||
|
||||
bridgeIp = "169.254.${toString cfg.addressblock}.10";
|
||||
|
||||
in {
|
||||
options.nix-bitcoin.netns-isolation = {
|
||||
enable = mkEnableOption "netns isolation";
|
||||
|
||||
addressblock = mkOption {
|
||||
type = types.ints.u8;
|
||||
default = "1";
|
||||
description = ''
|
||||
Specify the N address block in 169.254.N.0/24.
|
||||
'';
|
||||
};
|
||||
|
||||
services = mkOption {
|
||||
default = {};
|
||||
type = types.attrsOf (types.submodule {
|
||||
options = {
|
||||
id = mkOption {
|
||||
# TODO: Exclude 10
|
||||
# TODO: Assert uniqueness
|
||||
type = types.int;
|
||||
description = ''
|
||||
id for the netns, that is used for the IP address host part and
|
||||
naming the interfaces. Must be unique. Must not be 10.
|
||||
'';
|
||||
};
|
||||
connections = mkOption {
|
||||
type = with types; listOf str;
|
||||
default = [];
|
||||
};
|
||||
};
|
||||
});
|
||||
};
|
||||
};
|
||||
|
||||
config = mkMerge [
|
||||
(mkIf cfg.enable {
|
||||
# Prerequisites
|
||||
networking.dhcpcd.denyInterfaces = [ "br0" "br-nb*" "nb-veth*" ];
|
||||
services.tor.client.socksListenAddress = "${bridgeIp}:9050";
|
||||
networking.firewall.interfaces.br0.allowedTCPPorts = [ 9050 ];
|
||||
boot.kernel.sysctl."net.ipv4.ip_forward" = true;
|
||||
security.wrappers.netns-exec = {
|
||||
source = "${pkgs.nix-bitcoin.netns-exec}/netns-exec";
|
||||
capabilities = "cap_sys_admin=ep";
|
||||
owner = "${config.nix-bitcoin.operatorName}";
|
||||
permissions = "u+rx,g+rx,o-rwx";
|
||||
};
|
||||
|
||||
nix-bitcoin.netns-isolation.services = {
|
||||
};
|
||||
|
||||
systemd.services = {
|
||||
netns-bridge = {
|
||||
description = "Create bridge";
|
||||
requiredBy = [ "tor.service" ];
|
||||
before = [ "tor.service" ];
|
||||
script = ''
|
||||
${ip} link add name br0 type bridge
|
||||
${ip} link set br0 up
|
||||
${ip} addr add ${bridgeIp}/24 brd + dev br0
|
||||
${iptables} -w -t nat -A POSTROUTING -s 169.254.${toString cfg.addressblock}.0/24 -j MASQUERADE
|
||||
'';
|
||||
preStop = ''
|
||||
${iptables} -w -t nat -D POSTROUTING -s 169.254.${toString cfg.addressblock}.0/24 -j MASQUERADE
|
||||
${ip} link del br0
|
||||
'';
|
||||
serviceConfig = {
|
||||
Type = "oneshot";
|
||||
RemainAfterExit = "yes";
|
||||
};
|
||||
};
|
||||
} //
|
||||
(let
|
||||
makeNetnsServices = n: v: let
|
||||
vethName = "nb-veth-${toString v.id}";
|
||||
netnsName = "nb-${n}";
|
||||
ipNetns = "${ip} -n ${netnsName}";
|
||||
netnsIptables = "${ip} netns exec ${netnsName} ${config.networking.firewall.package}/bin/iptables";
|
||||
in {
|
||||
"${n}".serviceConfig.NetworkNamespacePath = "/var/run/netns/${netnsName}";
|
||||
|
||||
"netns-${n}" = rec {
|
||||
requires = [ "netns-bridge.service" ];
|
||||
after = [ "netns-bridge.service" ];
|
||||
bindsTo = [ "${n}.service" ];
|
||||
requiredBy = bindsTo;
|
||||
before = bindsTo;
|
||||
script = ''
|
||||
${ip} netns add ${netnsName}
|
||||
${ipNetns} link set lo up
|
||||
${ip} link add ${vethName} type veth peer name br-${vethName}
|
||||
${ip} link set ${vethName} netns ${netnsName}
|
||||
${ipNetns} addr add ${v.address}/24 dev ${vethName}
|
||||
${ip} link set br-${vethName} up
|
||||
${ipNetns} link set ${vethName} up
|
||||
${ip} link set br-${vethName} master br0
|
||||
${ipNetns} route add default via ${bridgeIp}
|
||||
${netnsIptables} -w -P INPUT DROP
|
||||
${netnsIptables} -w -A INPUT -s 127.0.0.1,${bridgeIp},${v.address} -j ACCEPT
|
||||
'' + (optionalString (config.services.${n}.enforceTor or false)) ''
|
||||
${netnsIptables} -w -P OUTPUT DROP
|
||||
${netnsIptables} -w -A OUTPUT -d 127.0.0.1,${bridgeIp},${v.address} -j ACCEPT
|
||||
'' + concatMapStrings (otherNetns: let
|
||||
other = netns.${otherNetns};
|
||||
in ''
|
||||
${netnsIptables} -w -A INPUT -s ${other.address} -j ACCEPT
|
||||
${netnsIptables} -w -A OUTPUT -d ${other.address} -j ACCEPT
|
||||
'') v.availableNetns;
|
||||
preStop = ''
|
||||
${ip} netns delete ${netnsName}
|
||||
${ip} link del br-${vethName}
|
||||
'';
|
||||
serviceConfig = {
|
||||
Type = "oneshot";
|
||||
RemainAfterExit = "yes";
|
||||
ExecStartPre = "-${ip} netns delete ${netnsName}";
|
||||
};
|
||||
};
|
||||
};
|
||||
in foldl (services: n:
|
||||
services // (makeNetnsServices n netns.${n})
|
||||
) {} (builtins.attrNames netns));
|
||||
|
||||
})
|
||||
# Custom netns config option values if netns-isolation not enabled
|
||||
(mkIf (!cfg.enable) {
|
||||
})
|
||||
];
|
||||
}
|
||||
|
|
@ -36,7 +36,7 @@ with lib;
|
|||
nodejs = { MemoryDenyWriteExecute = "false"; };
|
||||
# Allow tor traffic. Allow takes precedence over Deny.
|
||||
allowTor = {
|
||||
IPAddressAllow = "127.0.0.1/32 ::1/128";
|
||||
IPAddressAllow = "127.0.0.1/32 ::1/128 169.254.0.0/16";
|
||||
};
|
||||
# Allow any traffic
|
||||
allowAnyIP = { IPAddressAllow = "any"; };
|
||||
|
|
|
|||
|
|
@ -52,6 +52,11 @@ in {
|
|||
hiddenServices.sshd = mkHiddenService { port = 22; };
|
||||
};
|
||||
|
||||
# netns-isolation
|
||||
nix-bitcoin.netns-isolation = {
|
||||
addressblock = 1;
|
||||
};
|
||||
|
||||
# bitcoind
|
||||
services.bitcoind = {
|
||||
enable = true;
|
||||
|
|
|
|||
Loading…
Reference in New Issue
Block a user