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websocket address type: allow transport over RFC6455 #891

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websocket address type: allow transport over RFC6455 #891

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c35f10f
option_websocket: allow transport over RFC6455
rustyrussell Jul 27, 2021
729d0ed
websocket: make it an address type, not an option.
rustyrussell Aug 30, 2021
a174e0d
fixup! websocket: make it an address type, not an option.
rustyrussell Oct 25, 2021
5f94492
fixup! fixup! websocket: make it an address type, not an option.
rustyrussell Oct 25, 2021
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2 changes: 2 additions & 0 deletions .aspell.en.pws
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Expand Up @@ -387,3 +387,5 @@ CHECKSIGVERIFY
IFDUP
sats
anysegwit
WebSocket
websocket
14 changes: 13 additions & 1 deletion 07-routing-gossip.md
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Expand Up @@ -285,6 +285,7 @@ The following `address descriptor` types are defined:
onion service addresses; Encodes:
`[32:32_byte_ed25519_pubkey] || [2:checksum] || [1:version]`, where
`checksum = sha3(".onion checksum" | pubkey || version)[:2]`.
* `5`: WebSocket port; data = `[2:port]` (length 2)
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Doesn't this also need an interface/IP? Or it's meant to be a sort of modifier?

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The alternative is to duplicate all the entries, so this is simply a modifier.


### Requirements

Expand All @@ -306,12 +307,16 @@ The origin node:
- MUST place address descriptors in ascending order.
- SHOULD NOT place any zero-typed address descriptors anywhere.
- SHOULD use placement only for aligning fields that follow `addresses`.
- MUST NOT create a `type 1` OR `type 2` address descriptor with `port` equal
- MUST NOT create a `type 1`, `type 2` or `type 5` address descriptor with `port` equal
to 0.
- SHOULD ensure `ipv4_addr` AND `ipv6_addr` are routable addresses.
- MUST set `features` according to [BOLT #9](09-features.md#assigned-features-flags)
- SHOULD set `flen` to the minimum length required to hold the `features`
bits it sets.
- MUST NOT add a `type 5` address unless there is also at least one address of different type.
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What's the rationale here? To ensure a node is able to serve the "greater" network w/ a normal TCP (or w/e) transport?

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Yeah, there's already a js library which talks WS to this: https://github.com/rustyrussell/bolt12/

It's kinda cute...

- if it adds a type 5 address:
- MUST allow unencrypted RFC6455<sup>[3](#reference-3)</sup> as a transport when a connection is made to at least one of the other addresses, with the type 5 `port` substituted for that address's `port`
- SHOULD allow this on ALL of the other addresses.

The receiving node:
- if `node_id` is NOT a valid compressed public key:
Expand Down Expand Up @@ -359,6 +364,12 @@ to be ordered in ascending order, unknown ones can be safely ignored.
Additional fields beyond `addresses` may also be added in the future—with
optional padding within `addresses`, if they require certain alignment.

Websockets generally are run on adjacent ports (or even overloaded on
the same port) as existing "raw" transports, so including just the
port is a compromise which avoids replacating all the addresses. It's
ideal if all addresses support this, but it's not a hard requirement:
at least one must.

### Security Considerations for Node Aliases

Node aliases are user-defined and provide a potential avenue for injection
Expand Down Expand Up @@ -1123,6 +1134,7 @@ above.

1. <a id="reference-1">[RFC 1950 "ZLIB Compressed Data Format Specification version 3.3](https://www.ietf.org/rfc/rfc1950.txt)</a>
2. <a id="reference-2">[Maximum Compression Factor](https://zlib.net/zlib_tech.html)</a>
3. <a id="reference-3">[RFC 6455 "The WebSocket Protocol"](https://datatracker.ietf.org/doc/html/rfc6455)

![Creative Commons License](https://i.creativecommons.org/l/by/4.0/88x31.png "License CC-BY")
<br>
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32 changes: 32 additions & 0 deletions 08-transport.md
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Expand Up @@ -18,6 +18,7 @@ of a node.
* [Handshake State](#handshake-state)
* [Handshake State Initialization](#handshake-state-initialization)
* [Handshake Exchange](#handshake-exchange)
* [Alternate Transport Layers: WebSocket](#websocket)
* [Lightning Message Specification](#lightning-message-specification)
* [Encrypting and Sending Messages](#encrypting-and-sending-messages)
* [Receiving and Decrypting Messages](#receiving-and-decrypting-messages)
Expand Down Expand Up @@ -402,6 +403,36 @@ construction, and 16 bytes for a final authenticating tag.
10. `rn = 0, sn = 0`
* The sending and receiving nonces are initialized to 0.

## Alternate Transport Layers: WebSocket

Normally the transport protocol defined here is performed over TCP/IP,
but it can also be performed over other underlying transports, such as
the WebSocket protocol as specified in
RFC6455<sup>[4](#reference-4)</sup> on ports so-advertized (in the
[node_announcement message](07-routing-gossip.md#the-node_announcement-message).

A client may connect to this port node and initiate a WebSocket; and
operate the protocol over binary WebSocket frames instead of raw TCP/IP.


### Requirements

The initiator:
- MAY attempt to initiate an unencrypted WebSocket as specified in RFC6455<sup>[4](#reference-4)</sup>:
- MUST abort the connection attempt if WebSocket upgrade fails.
- MUST begin the [Handshake Exchange](#handshake-exchange) as initiator
as soon as upgrade succeeds.

The responder:
- if it supports WebSocket connections on a port:
- SHOULD advertize it using a type 5 address its node announcement.
- MUST abort the connection attempt if WebSocket upgrade fails.

Both nodes, after upgrade:
- MUST use binary frames to send and receive messages.
- MUST NOT rely on WebSocket framing for message semantics.


## Lightning Message Specification

At the conclusion of Act Three, both sides have derived the encryption keys, which
Expand Down Expand Up @@ -779,6 +810,7 @@ TODO(roasbeef); fin
1. <a id="reference-1">https://tools.ietf.org/html/rfc8439</a>
2. <a id="reference-2">http://noiseprotocol.org/noise.html</a>
3. <a id="reference-3">https://tools.ietf.org/html/rfc5869</a>
4. <a id="reference-4">https://tools.ietf.org/html/rfc6455</a>

# Authors

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1 change: 1 addition & 0 deletions 09-features.md
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Expand Up @@ -88,4 +88,5 @@ This work is licensed under a [Creative Commons Attribution 4.0 International Li
[bolt07-sync]: 07-routing-gossip.md#initial-sync
[bolt07-query]: 07-routing-gossip.md#query-messages
[bolt04-mpp]: 04-onion-routing.md#basic-multi-part-payments
[bolt08-websocket]: 08-transport.md#websocket
[ml-sighash-single-harmful]: https://lists.linuxfoundation.org/pipermail/lightning-dev/2020-September/002796.html