https://github.com/transumption-crypto/holo-router

Holo routing infrastructure
https://github.com/transumption-crypto/holo-router

Last synced: about 1 month ago
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Holo routing infrastructure

• Host: GitHub
• URL: https://github.com/transumption-crypto/holo-router
• Owner: transumption-crypto
• Created: 2020-04-10T15:02:39.000Z (over 4 years ago)
• Default Branch: develop
• Last Pushed: 2020-03-15T20:15:20.000Z (over 4 years ago)
• Last Synced: 2024-09-13T16:18:39.835Z (3 months ago)
• Homepage:
• Size: 422 KB
• Stars: 5
• Watchers: 1
• Forks: 2
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE-Apache-2.0.txt

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README

        
# Holo Router

## Architecture

![Architecture diagram](./diagram.svg)

### Agent

Agent sends a JSON payload of `instant` (current Unix time in milliseconds,

used to protect against replay attacks), `holochain_public_key` in [Base36][]

encoding, and `zerotier_address` in hexadecimal to [Registry](#registry) `POST

/v1/update` endpoint. Payload is signed by Holochain and ZeroTier keys.

Signatures are specified as HTTP headers in Base64 format.

[Base36]: https://github.com/transumption-unstable/base36

Example request:

```

HTTP POST https://router-registry.holo.host/v1/update

X-Holochain-Signature: Rl0zgv+t2aBVHX2hrvx7OwZZnssA4n3WMp3i

X-ZeroTier-Signature: xgTafxZtsb4DzWij4mk40ONC2QlHQ1UfB+FMC

{

  "instant": 1568784840568,

  "holochain_public_key": "cf05t9ugbh4wukhcws2m0ra4vginah2wnx3cd9kuselrfxncj",

  "zerotier_address": "59727631b0"

}

```

Endpoint is idempotent, so that Agent can run periodically, at the very least

on each boot. This makes loss of Registry state much less of an issue, since

Agents will naturally repopulate it (subject to how often it is set up to run).

### Gateway

Gateway dispatches unaltered TCP traffic by TLS SNI that is resolved using

system-wide DNS, which is normally set to [Registry](#registry) `GET

/v1/dns-query` passed through [dnscrypt-proxy][].

Dispatch is only allowed for hostnames that end with `.holohost.net`.

[dnscrypt-proxy]: https://github.com/DNSCrypt/dnscrypt-proxy

[letsencrypt]: https://letsencrypt.org

[wikipedia-sni]: https://en.wikipedia.org/wiki/Server_Name_Indication

### Registry

[DNS-over-HTTPS][wikipedia-dns-over-https] resolver and HTTP `POST /v1/update`

server implemented on top of [Cloudflare Workers][cloudflare-workers].

Endpoints:

- `POST /v1/update` adds Base36-encoded Holochain public key -> internal

  ZeroTier IPv4 address mapping to [Workers KV][cloudflare-workers-kv].

  See [Agent](#agent) docs for request docs. Response doesn't have a body.

- `POST /v1/dns-query` is a [DNS-over-HTTPS][wikipedia-dns-over-https] resolver.

  It accepts `A` queries, looks internal IPv4 address by public key, and

  responds with ZeroTier IPv4 address. TTL is hardcoded to 10 seconds.

  Both request and response are in `application/dns-message` DNS wire format.

  For encoder/decoder, see [dns-packet][]. Also see [RFC 8484][rfc8484].

[cloudflare-workers]: https://workers.cloudflare.com

[cloudflare-workers-kv]: https://cloudflare.com/products/workers-kv/

[dns-packet]: https://github.com/mafintosh/dns-packet

[rfc8484]: https://tools.ietf.org/html/rfc8484

[wikipedia-dns-over-https]: https://en.wikipedia.org/wiki/DNS_over_HTTPS