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README: minor fixes

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- `packages and dependencies are pinned`
  Reworded and moved to `Integrity`
- `most packages are built from the NixOS stable channel...`
  Removed because this is false
- `builds happen in a sandboxed environment`
  Removed because this depends on the user's local nix configuration
  and cannot be enforced by nix-bitcoin
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Erik Arvstedt 2021-10-01 11:52:04 +02:00
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README.md
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@ -52,7 +52,7 @@ Features
A [configuration preset](modules/presets/secure-node.nix) for setting up a secure node
* All applications use Tor for outbound connections and support accepting inbound connections via onion services.
NixOS modules
NixOS modules ([src](modules/modules.nix))
* Application services
* [bitcoind](https://github.com/bitcoin/bitcoin), with a default banlist against spy nodes
* [clightning](https://github.com/ElementsProject/lightning) with support for announcing an onion service\
@ -85,10 +85,10 @@ NixOS modules
Security
---
* **Simplicity:** Only services you select in `configuration.nix` and their dependencies are installed, packages and dependencies are [pinned](pkgs/nixpkgs-pinned.nix), support for [doas](https://github.com/Duncaen/OpenDoas) ([sudo alternative](https://lobste.rs/s/efsvqu/heap_based_buffer_overflow_sudo_cve_2021#c_c6fcfa)), most packages are built from the [NixOS stable channel](https://github.com/NixOS/nixpkgs/tree/nixos-20.09), with a few exceptions that are built from the nixpkgs unstable channel, builds happen in a [sandboxed environment](https://nixos.org/manual/nix/stable/#conf-sandbox), code is continuously 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](pkgs/lib.nix), [RPC whitelisting](modules/bitcoind-rpc-public-whitelist.nix), and [netns-isolation](modules/netns-isolation.nix). There's a non-root user *operator* to interact with the various services.
* **Defense-in-depth:** nix-bitcoin is built with a [hardened kernel](https://github.com/NixOS/nixpkgs/blob/master/nixos/modules/profiles/hardened.nix) by default, services are confined through discretionary access control, Linux namespaces, [dbus firewall](modules/security.nix) and seccomp-bpf with continuous improvements.
* **Simplicity:** Only services enabled in `configuration.nix` and their dependencies are installed, support for [doas](https://github.com/Duncaen/OpenDoas) ([sudo alternative](https://lobste.rs/s/efsvqu/heap_based_buffer_overflow_sudo_cve_2021#c_c6fcfa)), code is continuously reviewed and refined.
* **Integrity:** The Nix package manager guarantees that all dependencies are exactly specified, 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 features](pkgs/lib.nix), [RPC whitelisting](modules/bitcoind-rpc-public-whitelist.nix) and [netns-isolation](modules/netns-isolation.nix). There's a non-root user *operator* to interact with the various services.
* **Defense-in-depth:** nix-bitcoin supports a [hardened kernel](https://github.com/NixOS/nixpkgs/blob/master/nixos/modules/profiles/hardened.nix), services are confined through discretionary access control, Linux namespaces, [dbus firewall](modules/security.nix) and seccomp-bpf with continuous improvements.
Note that if the machine you're deploying *from* is insecure, there is nothing nix-bitcoin can do to protect itself.