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Merge #144: Electrs fixes 
5596bcf4fb bitcoind: set default rpcuser (Erik Arvstedt)
c4cf323873 electrs: add option 'extraArgs' (Erik Arvstedt)
e731d71232 electrs: add option 'address' (Erik Arvstedt)
1e62456ed1 electrs: test RPC connection to bitcoind (Erik Arvstedt)
0be67c325e electrs: use cfg.user, cfg.group (Erik Arvstedt)
48be5a79fa electrs.enable: use mkEnableOption (Erik Arvstedt)
b75b2a1626 electrs: improve description (Erik Arvstedt)
fa3455d01f electrs: don't leak bitcoinrpc secret through process ARGV (Erik Arvstedt)
f30aadbef2 electrs: enable unstable build, pin pkg to unstable (Erik Arvstedt)
5c6571654e electrs: 0.7.1 -> 0.8.3 (Erik Arvstedt)
47481b2642 electrs: quote dataDir in shell cmd (Erik Arvstedt)
8fb33d1099 electrs: use bitcoind.dataDir option (Erik Arvstedt)
45ba1f1fb3 electrs: don't print timestamps to log (Erik Arvstedt)
88080a58bf electrs: wrap long lines in preStart (Erik Arvstedt)
301bb91ae5 simplify setting high-memory options (Erik Arvstedt)
93fd2329b8 electrs: make nginx TLS proxy optional (Erik Arvstedt)
acde24ce43 electrs: move user/group definitions to bottom (Erik Arvstedt)
148327326b electrs: formatting (Erik Arvstedt)
cce9932b62 make pinned pkgs accessible through pkgs/default.nix (Erik Arvstedt)

Pull request description:

ACKs for top commit:
  jonasnick:
    ACK 5596bcf4fb

Tree-SHA512: 2064b352839a1787ccb05930ac2cf1f0d3596aaea81135086e8a91b9eebf319868087a27cdf9f2fd0152ab652d338680cdf9e866185e86777fcdd87931651b39
2020-03-04 21:03:48 +00:00
docs Rename contrib/ to helper/ 2019-11-11 18:45:17 +01:00
helper travis: cache all build outputs with cachix 2020-01-13 00:25:11 +01:00
modules bitcoind: set default rpcuser 2020-03-04 18:09:52 +01:00
network make secrets dir location configurable 2020-01-13 00:25:12 +01:00
pkgs electrs: enable unstable build, pin pkg to unstable 2020-03-04 18:09:50 +01:00
test electrs: test RPC connection to bitcoind 2020-03-04 18:09:52 +01:00
.gitignore add setup-secrets.service 2020-01-12 20:02:01 +01:00
.travis.yml add modules test 2020-01-13 00:25:12 +01:00
configuration.nix Document how to override attributes in configuration.nix 2020-02-23 19:30:32 +00:00
default.nix simplify overlay.nix 2020-01-09 10:43:29 +01:00
LICENSE Add license 2019-01-02 14:03:52 +00:00
overlay.nix simplify overlay.nix 2020-01-09 10:43:29 +01:00
README.md Mention problems with hardened kernel and NUCs in README 2019-08-19 20:51:46 +00:00
shell.nix simplify secrets file format 2020-01-13 00:25:11 +01:00

README.md

nix-bitcoin

Nix packages and nixos modules for easily installing Bitcoin nodes and higher layer protocols with an emphasis on security. This is a work in progress - don't expect it to be bug free or secure.

The default configuration sets up a Bitcoin Core node and c-lightning. The user can enable spark-wallet in configuration.nix to make c-lightning accessible with a smartphone using spark-wallet. A simple webpage shows the lightning nodeid and links to nanopos letting the user receive donations. It also includes elements-daemon. Outbound peer-to-peer traffic is forced through Tor, and listening services are bound to onion addresses.

A demo installation is running at http://6tr4dg3f2oa7slotdjp4syvnzzcry2lqqlcvqkfxdavxo6jsuxwqpxad.onion. The following screen cast shows a fresh deployment of a nix-bitcoin node.

The goal is to make it easy to deploy a reasonably secure Bitcoin node with a usable wallet. It should allow managing bitcoin (the currency) effectively and providing public infrastructure. It should be a reproducible and extensible platform for applications building on Bitcoin.

Available modules

By default the configuration.nix provides:

  • bitcoind with outbound connections through Tor and inbound connections through a hidden service. By default loaded with banlist of spy nodes.
  • clightning with outbound connections through Tor, not listening
  • includes "nodeinfo" script which prints basic info about the node
  • adds non-root user "operator" which has access to bitcoin-cli and lightning-cli

In configuration.nix the user can enable:

  • a clightning hidden service
  • liquid
  • lightning charge
  • nanopos
  • an index page using nginx to display node information and link to nanopos
  • spark-wallet
  • electrs
  • recurring-donations, a module to repeatedly send lightning payments to recipients specified in the configuration.
  • bitcoin-core-hwi.
    • You no longer need extra software to connect your hardware wallet to Bitcoin Core. Use Bitcoin Core's own Hardware Wallet Interface with one configuration.nix setting.

The data directories of the services can be found in /var/lib on the deployed machines.

Installation

The easiest way is to run nix-shell (on a Linux machine) in the nix-bitcoin directory and then create a NixOps deployment with the provided network.nix in the network directory. Fix the FIXMEs in configuration.nix and deploy with nixops in nix-shell. See install.md for a detailed tutorial.

Security

  • Simplicity: Only services you select in configuration.nix and their dependencies are installed, packages and dependencies are pinned, most packages are built from the nixos stable channel, with a few exceptions that are built from the nixpkgs unstable channel, builds happen in a sandboxed environment, code is continiously reviewed and refined.
  • Integrity: Nix package manager, NixOS and packages can be built from source to reduce reliance on binary caches, nix-bitcoin merge commits are signed, all commits are approved by multiple nix-bitcoin developers, upstream packages are cryptographically verified where possible, we use this software ourselves.
  • Principle of Least Privilege: Services operate with least privileges; they each have their own user and are restricted further with systemd options, there's a non-root user operator to interact with the various services.
  • Defense-in-depth: nix-bitcoin is built with a hardened kernel by default, services are confined through discretionary access control, Linux namespaces, and seccomp-bpf with continuous improvements.

Note that nix-bitcoin is still experimental. Also, by design if the machine you're deploying from is insecure, there is nothing nix-bitcoin can do to protect itself.

Hardware requirements

  • Disk space: 300 GB (235GB for Bitcoin blockchain + some room)
    • Bitcoin Core pruning is not supported at the moment because it's not supported by c-lightning. It's possible to use pruning but you need to know what you're doing.
  • RAM: 2GB of memory. ECC memory is better. Additionally, it's recommended to use DDR4 memory with targeted row refresh (TRR) enabled (https://rambleed.com/).

Tested hardware includes pcengine's apu2c4, GB-BACE-3150, GB-BACE-3160. Some hardware (including Intel NUCs) may not be compatible with the hardened kernel turned on by default (see https://github.com/fort-nix/nix-bitcoin/issues/39#issuecomment-517366093 for a workaround).

Usage

For usage instructions, such as how to connect to spark-wallet, electrs and the ssh Tor Hidden Service, see usage.md.

Troubleshooting

If you are having problems with nix-bitcoin check the FAQ or submit an issue. There's also a #nix-bitcoin IRC channel on freenode. We are always happy to help.

Docs