fips/README.md

# FIPS: Free Internetworking Peering System

![banner](docs/logos/fips_banner.png)
[![License: MIT](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE)
[![Rust](https://img.shields.io/badge/rust-1.85%2B-orange.svg)](https://www.rust-lang.org/)
[![Status](https://img.shields.io/badge/status-v0.2.0-green.svg)](#status--roadmap)

A distributed, decentralized network routing protocol for mesh nodes
connecting over arbitrary transports.

> FIPS is under active development. The protocol and APIs are not yet stable.
> See [Status & Roadmap](#status--roadmap) below.

## Overview

FIPS is a self-organizing mesh network that operates natively over a variety
of physical and logical media — local area networks, Bluetooth, serial links,
radio, or the existing internet as an overlay. Nodes generate their own
identities, discover each other, and route traffic without any central
authority or global topology knowledge.

FIPS uses Nostr keypairs (secp256k1/schnorr) as native node identities,
allowing users to generate their own persistent or ephemeral node addresses.
Nodes address each other by npub, and the same cryptographic identity serves
as both the routing address and the basis for end-to-end encrypted sessions
across the mesh.

FIPS allows existing TCP/IP based network software to use the FIPS mesh
network by generating a local IP address from the node npub and tunnelling
IP packets to other endpoints transparently knowing only their npub. Native
FIPS-aware applications do not need this IP tunneling or emulation capability.

All traffic over the FIPS mesh is encrypted and authenticated both
hop-to-hop between peers and independently end-to-end between FIPS
endpoints.

## Features

- **Self-organizing mesh routing** — spanning tree coordinates with bloom
  filter guided discovery, no global routing tables
- **Multi-transport** — UDP, TCP, Ethernet, Tor, and Bluetooth (BLE L2CAP)
  today; designed for serial and radio
- **Noise encryption** — hop-by-hop link encryption (IK) plus independent
  end-to-end session encryption (XK), with periodic rekey for forward secrecy
- **Nostr-native identity** — secp256k1 keypairs as node addresses, no
  registration or central authority
- **IPv6 adaptation** — TUN interface maps npubs to fd00::/8 addresses for
  unmodified IP applications; static hostname mapping (`/etc/fips/hosts`)
- **Metrics Measurement Protocol** — per-link RTT, loss, jitter, and goodput
  measurement with mesh size estimation
- **ECN congestion signaling** — hop-by-hop CE flag relay with RFC 3168 IPv6
  marking, transport kernel drop detection
- **Operator visibility** — `fipsctl` CLI and `fipstop` TUI dashboard for
  runtime inspection and runtime peer management
- **Zero configuration** — sensible defaults; a node can start with no config
  file, though peer addresses are needed to join a network

## Building

```bash
git clone https://github.com/jmcorgan/fips.git
cd fips
cargo build --release
```

Requires Rust 1.85+ (edition 2024) and a Unix-like OS with TUN support
(Linux or macOS).

### Transport support by platform

| Transport | Linux | macOS | Windows |
|-----------|:-----:|:-----:|:-------:|
| UDP       |  ✅   |  ✅   |   ❌    |
| TCP       |  ✅   |  ✅   |   ❌    |
| Ethernet  |  ✅   |  ✅   |   ❌    |
| Tor       |  ✅   |  ✅   |   ❌    |
| BLE       |  ✅   |  ❌   |   ❌    |

On **Linux**, the BLE transport requires BlueZ and libdbus. On
Debian/Ubuntu: `sudo apt install bluez libdbus-1-dev`. Then build with
BLE enabled: `cargo build --release --features ble`.

## Installation

After building, choose one of the following methods to install.

### Debian / Ubuntu (.deb)

Requires [cargo-deb](https://crates.io/crates/cargo-deb):

```bash
cargo install cargo-deb
cargo deb
sudo dpkg -i target/debian/fips_*.deb
```

This installs the daemon, CLI tools, systemd units, and a default
configuration. Edit `/etc/fips/fips.yaml` before starting:

```bash
sudo nano /etc/fips/fips.yaml
sudo systemctl start fips
```

The service is enabled at boot automatically. To use `fipsctl` and
`fipstop` without sudo, add your user to the `fips` group:

```bash
sudo usermod -aG fips $USER    # log out and back in to take effect
```

Remove with `sudo dpkg -r fips` (preserves config) or
`sudo dpkg -P fips` (removes everything including identity keys).

### Generic Linux (systemd tarball)

```bash
./packaging/systemd/build-tarball.sh
tar xzf deploy/fips-*-linux-*.tar.gz
cd fips-*-linux-*/
sudo ./install.sh
```

See [packaging/systemd/README.install.md](packaging/systemd/README.install.md)
for the full installation and configuration guide.

### macOS (.pkg)

```bash
./packaging/macos/build-pkg.sh
sudo installer -pkg deploy/fips-*-macos-*.pkg -target /
```

This installs binaries to `/usr/local/bin/`, config to
`/usr/local/etc/fips/`, sets up `.fips` DNS resolution via
`/etc/resolver/fips`, and registers a launchd daemon. Edit
`/usr/local/etc/fips/fips.yaml` before starting:

```bash
sudo nano /usr/local/etc/fips/fips.yaml
sudo launchctl load -w /Library/LaunchDaemons/com.fips.daemon.plist
```

Remove with `sudo packaging/macos/uninstall.sh` (preserves config).

To restart the node after making configuration changes:

```bash
sudo launchctl unload -w /Library/LaunchDaemons/com.fips.daemon.plist
sudo launchctl load -w /Library/LaunchDaemons/com.fips.daemon.plist
```

Check logs for troubleshooting:

```bash
sudo tail -f /usr/local/var/log/fips/fips.log
```

> **Note:** On macOS, the TUN device is named `utun<N>` (kernel-assigned)
> rather than `fips0`.

## Configuration

The default configuration file is installed at `/etc/fips/fips.yaml`:

```yaml
# FIPS Node Configuration

node:
  identity:
    # By default, a new ephemeral keypair is generated on each start.
    # Uncomment persistent to keep the same identity across restarts;
    # on first start a keypair is saved to fips.key/fips.pub next to
    # this config file (mode 0600/0644).
    # persistent: true
    #
    # Or set an explicit key (overrides persistent):
    # nsec: "nsec1..."

tun:
  enabled: true
  name: fips0
  mtu: 1280

dns:
  enabled: true
  bind_addr: "127.0.0.1"
  port: 5354

transports:
  udp:
    bind_addr: "0.0.0.0:2121"

  tcp:
    # Accepts inbound connections. No static outbound peers.
    bind_addr: "0.0.0.0:8443"

  # Ethernet transport — uncomment and set your interface name.
  # ethernet:
  #   interface: "eth0"
  #   discovery: true
  #   announce: true
  #   auto_connect: true
  #   accept_connections: true

peers:
  # Static peers for bootstrapping (UDP or TCP):
  - npub: "npub1qmc3cvfz0yu2hx96nq3gp55zdan2qclealn7xshgr448d3nh6lks7zel98"
    alias: "fips-test-node"
    addresses:
      - transport: udp
        addr: "217.77.8.91:2121"
    connect_policy: auto_connect
```

See [docs/design/fips-configuration.md](docs/design/fips-configuration.md)
for the full reference.

## Usage

### DNS Resolution

FIPS includes a DNS resolver (enabled by default, port 5354) that maps
`.fips` names to fd00::/8 IPv6 addresses.

**Linux** (systemd-resolved):

```bash
sudo resolvectl dns fips0 127.0.0.1:5354
sudo resolvectl domain fips0 ~fips
```

**macOS**: DNS is configured automatically by the `.pkg` installer via
`/etc/resolver/fips`. No manual setup is needed.

Then reach any FIPS node by npub with standard IPv6 tools:

```bash
ping6 npub1bbb....fips
ssh -6 npub1bbb....fips
```

> **macOS note:** Use `ping6` instead of `ping`. macOS ships separate
> `ping` (IPv4-only) and `ping6` (IPv6) binaries; `ping` will not
> resolve AAAA records. Similarly, use `curl -6`, `ssh -6`, etc. when
> connecting by `.fips` hostname.

### Monitoring

Use `fipsctl` to query a running node:

```bash
fipsctl show status       # Node status overview
fipsctl show peers        # Authenticated peers
fipsctl show links        # Active links
fipsctl show tree         # Spanning tree state
fipsctl show sessions     # End-to-end sessions
fipsctl show transports   # Transport instances
fipsctl show routing      # Routing table summary
```

`fipstop` provides an interactive TUI dashboard with live-updating
views of node status, peers, links, sessions, tree state, transports,
and routing:

```bash
fipstop                   # connect to local daemon
fipstop -r 1              # 1-second refresh interval
```

### Service Management

```bash
sudo systemctl start fips
sudo systemctl stop fips
sudo systemctl restart fips
sudo journalctl -u fips -f
```

### Testing

See [testing/](testing/) for Docker-based integration test harnesses
including static topology tests and stochastic chaos simulation.

## Documentation

Protocol design documentation is in [docs/design/](docs/design/), organized as
a layered protocol specification. Start with
[fips-intro.md](docs/design/fips-intro.md) for the full protocol overview.

If you want to contribute, start with:

- [CONTRIBUTING.md](CONTRIBUTING.md)
- [docs/design/README.md](docs/design/README.md)
- [testing/README.md](testing/README.md)

## Project Structure

```text
src/          Rust source (library + fips/fipsctl/fipstop binaries)
packaging/    Debian, systemd tarball, and shared packaging files
docs/design/  Protocol design specifications
testing/      Docker-based integration test harnesses
```

## Status & Roadmap

FIPS is at **v0.2.0**. The core protocol works end-to-end over UDP, TCP,
Ethernet, Tor, and Bluetooth (BLE) with a small live mesh of deployed nodes.

### What works today

- Spanning tree construction with greedy coordinate routing
- Bloom filter guided discovery (no flooding, single-path with retry)
- Noise IK (link layer) and Noise XK (session layer) encryption
- Periodic Noise rekey with hitless cutover for forward secrecy (FMP + FSP)
- Persistent node identity with key file management
- IPv6 TUN adapter with DNS resolution of `.fips` names
- Static hostname mapping (`/etc/fips/hosts`) with auto-reload
- Per-link metrics (RTT, loss, jitter, goodput) and mesh size estimation
- ECN congestion signaling (hop-by-hop CE relay, IPv6 CE marking, kernel drop detection)
- UDP, TCP, Ethernet, Tor, and BLE transports (BLE via L2CAP CoC with per-link MTU negotiation)
- Runtime inspection and peer management via `fipsctl` and `fipstop`
- Reproducible builds with toolchain pinning and SOURCE_DATE_EPOCH
- Linux (Debian, systemd tarball, OpenWrt, AUR) and macOS packaging
- Docker-based integration and chaos testing

### Near-term priorities

- Peer discovery via Nostr relays (bootstrap without static peer lists)
- Native API for FIPS-aware applications (npub:port addressing)
- Security audit of cryptographic protocols

### Longer-term

- Mobile platform support
- Bandwidth-aware routing and QoS
- Protocol stability and versioned wire format
- Published crate

## License

MIT — see [LICENSE](LICENSE).