80 lines
2.5 KiB
Nix
80 lines
2.5 KiB
Nix
# This module enables unprivileged users to read onion addresses.
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# By default, onion addresses in /var/lib/tor/onion are only readable by the
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# tor user.
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# The included service copies onion addresses to /var/lib/onion-addresses/<user>/
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# and sets permissions according to option 'access'.
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{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.nix-bitcoin.onionAddresses;
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inherit (config) nix-bitcoin-services;
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dataDir = "/var/lib/onion-addresses/";
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onion-addresses-script = pkgs.writeScript "onion-addresses.sh" ''
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# wait until tor is up
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until ls -l /var/lib/tor/state; do sleep 1; done
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cd ${dataDir}
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# Create directory for every user and set permissions
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${ builtins.foldl'
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(x: user: x +
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''
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mkdir -p -m 0700 ${user}
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chown ${user} ${user}
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# Copy onion hostnames into the user's directory
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${ builtins.foldl'
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(x: onion: x +
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''
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ONION_FILE=/var/lib/tor/onion/${onion}/hostname
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if [ -e "$ONION_FILE" ]; then
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cp $ONION_FILE ${user}/${onion}
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chown ${user} ${user}/${onion}
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fi
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'')
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""
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(builtins.getAttr user cfg.access)
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}
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'')
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""
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(builtins.attrNames cfg.access)
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}
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'';
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in {
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options.nix-bitcoin.onionAddresses = {
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access = mkOption {
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type = with types; attrsOf (listOf str);
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default = {};
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description = ''
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This option controls who is allowed to access onion addresses.
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For example, the following allows user 'myuser' to access bitcoind
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and clightning onion addresses:
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{
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"myuser" = [ "bitcoind" "clightning" ];
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};
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The onion hostnames can then be read from
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/var/lib/onion-addresses/myuser.
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'';
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};
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};
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config = mkIf (cfg.access != {}) {
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systemd.services.onion-addresses = {
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wantedBy = [ "tor.service" ];
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bindsTo = [ "tor.service" ];
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after = [ "tor.service" ];
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serviceConfig = nix-bitcoin-services.defaultHardening // {
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ExecStart = "${pkgs.bash}/bin/bash ${onion-addresses-script}";
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Type = "oneshot";
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RemainAfterExit = true;
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StateDirectory = "onion-addresses";
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PrivateNetwork = "true"; # This service needs no network access
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PrivateUsers = "false";
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CapabilityBoundingSet = "CAP_CHOWN CAP_FSETID CAP_SETFCAP CAP_DAC_OVERRIDE CAP_DAC_READ_SEARCH CAP_FOWNER CAP_IPC_OWNER";
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};
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};
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};
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}
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