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Diffstat (limited to 'krebs/3modules/retiolum.nix')
| -rw-r--r-- | krebs/3modules/retiolum.nix | 226 |
1 files changed, 226 insertions, 0 deletions
diff --git a/krebs/3modules/retiolum.nix b/krebs/3modules/retiolum.nix new file mode 100644 index 00000000..481d6565 --- /dev/null +++ b/krebs/3modules/retiolum.nix @@ -0,0 +1,226 @@ +{ config, pkgs, lib, ... }: + +with builtins; +with lib; +let + cfg = config.krebs.retiolum; + + out = { + options.krebs.retiolum = api; + config = mkIf cfg.enable imp; + }; + + api = { + enable = mkEnableOption "krebs.retiolum"; + + name = mkOption { + type = types.str; + default = config.networking.hostName; + # Description stolen from tinc.conf(5). + description = '' + This is the name which identifies this tinc daemon. It must + be unique for the virtual private network this daemon will + connect to. The Name may only consist of alphanumeric and + underscore characters. If Name starts with a $, then the + contents of the environment variable that follows will be + used. In that case, invalid characters will be converted to + underscores. If Name is $HOST, but no such environment + variable exist, the hostname will be read using the + gethostnname() system call This is the name which identifies + the this tinc daemon. + ''; + }; + + generateEtcHosts = mkOption { + type = types.str; + default = "both"; + description = '' + If set to <literal>short</literal>, <literal>long</literal>, or <literal>both</literal>, + then generate entries in <filename>/etc/hosts</filename> from subnets. + ''; + }; + + network = mkOption { + type = types.str; + default = "retiolum"; + description = '' + The tinc network name. + It is used to generate long host entries, + and name the TUN device. + ''; + }; + + tincPackage = mkOption { + type = types.package; + default = pkgs.tinc; + description = "Tincd package to use."; + }; + + hosts = mkOption { + type = with types; either package path; + default = ../../Zhosts; + description = '' + If a path is given, then it will be used to generate an ad-hoc package. + ''; + }; + + iproutePackage = mkOption { + type = types.package; + default = pkgs.iproute; + description = "Iproute2 package to use."; + }; + + + privateKeyFile = mkOption { + # TODO if it's types.path then it gets copied to /nix/store with + # bad unsafe permissions... + type = types.str; + default = "/root/src/secrets/retiolum.rsa_key.priv"; + description = '' + Generate file with <literal>tincd -K</literal>. + This file must exist on the local system. The default points to + <secrets/retiolum.rsa_key.priv>. + ''; + }; + + connectTo = mkOption { + type = types.listOf types.str; + default = [ "fastpoke" "pigstarter" "gum" ]; + description = '' + The list of hosts in the network which the client will try to connect + to. These hosts should have an 'Address' configured which points to a + routeable IPv4 or IPv6 address. + ''; + }; + + }; + + imp = { + environment.systemPackages = [ tinc hosts iproute ]; + + networking.extraHosts = retiolumExtraHosts; + + systemd.services.retiolum = { + description = "Tinc daemon for Retiolum"; + after = [ "network.target" ]; + wantedBy = [ "multi-user.target" ]; + path = [ tinc iproute ]; + serviceConfig = { + PermissionsStartOnly = "true"; + PrivateTmp = "true"; + Restart = "always"; + # TODO we cannot chroot (-R) b/c we use symlinks to hosts + # and the private key. + ExecStartPre = pkgs.writeScript "retiolum-init" '' + #! /bin/sh + install -o ${user.name} -m 0400 ${cfg.privateKeyFile} /tmp/retiolum-rsa_key.priv + ''; + ExecStart = "${tinc}/sbin/tincd -c ${confDir} -d 0 -U ${user.name} -D"; + SyslogIdentifier = "retiolum"; + }; + }; + + users.extraUsers = singleton { + inherit (user) name uid; + }; + }; + + user = { + name = "retiolum"; + uid = 301281149; # genid retiolum + }; + + tinc = cfg.tincPackage; + + hosts = getAttr (typeOf cfg.hosts) { + package = cfg.hosts; + path = pkgs.stdenv.mkDerivation { + name = "custom-retiolum-hosts"; + src = cfg.hosts; + installPhase = '' + mkdir $out + find . -name .git -prune -o -type f -print0 \ + | xargs -0 cp --target-directory $out + ''; + }; + }; + + iproute = cfg.iproutePackage; + + retiolumExtraHosts = import (pkgs.runCommand "retiolum-etc-hosts" + { } + '' + generate() { + (cd ${hosts} + printf \'\' + for i in `ls`; do + names=$(hostnames $i) + for j in `sed -En 's|^ *Aliases *= *(.+)|\1|p' $i`; do + names="$names $(hostnames $j)" + done + sed -En ' + s|^ *Subnet *= *([^ /]*)(/[0-9]*)? *$|\1 '"$names"'|p + ' $i + done | sort + printf \'\' + ) + } + + case ${cfg.generateEtcHosts} in + short) + hostnames() { echo "$1"; } + generate + ;; + long) + hostnames() { echo "$1.${cfg.network}"; } + generate + ;; + both) + hostnames() { echo "$1.${cfg.network} $1"; } + generate + ;; + *) + echo '""' + ;; + esac > $out + ''); + + + confDir = pkgs.runCommand "retiolum" { + # TODO text + executable = true; + preferLocalBuild = true; + } '' + set -euf + + mkdir -p $out + + ln -s ${hosts} $out/hosts + + cat > $out/tinc.conf <<EOF + Name = ${cfg.name} + Device = /dev/net/tun + Interface = ${cfg.network} + ${concatStrings (map (c : "ConnectTo = " + c + "\n") cfg.connectTo)} + PrivateKeyFile = /tmp/retiolum-rsa_key.priv + EOF + + # source: krebscode/painload/retiolum/scripts/tinc_setup/tinc-up + cat > $out/tinc-up <<EOF + host=$out/hosts/${cfg.name} + ${iproute}/sbin/ip link set \$INTERFACE up + + addr4=\$(sed -n 's|^ *Subnet *= *\(10[.][^ ]*\) *$|\1|p' \$host) + if [ -n "\$addr4" ];then + ${iproute}/sbin/ip -4 addr add \$addr4 dev \$INTERFACE + ${iproute}/sbin/ip -4 route add 10.243.0.0/16 dev \$INTERFACE + fi + addr6=\$(sed -n 's|^ *Subnet *= *\(42[:][^ ]*\) *$|\1|p' \$host) + ${iproute}/sbin/ip -6 addr add \$addr6 dev \$INTERFACE + ${iproute}/sbin/ip -6 route add 42::/16 dev \$INTERFACE + EOF + + chmod +x $out/tinc-up + ''; + +in out |