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= "2.1.2" +tokio-rustls = { version = "0.26", default-features = false } +rcgen = { version = "0.10.0", features = ["pem", "x509-parser"] } +cln-plugin = { version = "0.1" } +cln-rpc = { version = "0.1" } +serde_json = "1.0.120" + +[dependencies.tokio] +features = ["net", "rt-multi-thread"] +version = "1" diff --git a/plugins/rest-plugin/README.md b/plugins/rest-plugin/README.md new file mode 100644 index 000000000000..52d8db7eabdc --- /dev/null +++ b/plugins/rest-plugin/README.md @@ -0,0 +1,5 @@ +# REST plugin for Core Lightning + +## Getting started + +## Connecting diff --git a/plugins/rest-plugin/src/main.rs b/plugins/rest-plugin/src/main.rs new file mode 100644 index 000000000000..dba4f7b90962 --- /dev/null +++ b/plugins/rest-plugin/src/main.rs @@ -0,0 +1,265 @@ +use anyhow::{anyhow, Result}; +use bytes::{Buf, Bytes}; +use cln_plugin::{options, Builder, Plugin}; +use cln_rpc::model::responses::CheckruneResponse; +use cln_rpc::notifications::Notification; +use cln_rpc::ClnRpc; +use http_body_util::{BodyExt, Full}; +use hyper::body::Body; +use hyper::{Request, Response, StatusCode}; +use hyper_util::rt::{TokioExecutor, TokioIo}; +use hyper_util::server::conn::auto::Builder as HyperBuilder; +use log::{debug, error, warn}; +use rustls::ServerConfig; +use serde_json::json; +use std::net::SocketAddr; +use std::path::PathBuf; +use std::sync::Arc; +use tokio::net::TcpListener; +use tokio::sync::broadcast; +use tokio_rustls::TlsAcceptor; + +mod tls; + +#[derive(Clone, Debug)] +struct PluginState { + rpc_path: PathBuf, + identity: tls::Identity, + events: broadcast::Sender, +} + +const OPTION_REST_PORT: options::IntegerConfigOption = options::ConfigOption::new_i64_no_default( + "clnrest-port", + "Which port should the rest plugin listen for incoming connections?", +); + +const OPTION_REST_MSG_BUFFER_SIZE : options::DefaultIntegerConfigOption = options::ConfigOption::new_i64_with_default( + "clnrest-msg-buffer-size", + 1024, + "Number of notifications which can be stored in the rest message buffer. Notifications can be skipped if this buffer is full"); + +#[tokio::main(flavor = "current_thread")] +async fn main() -> Result<()> { + debug!("Starting rest plugin"); + + let directory = std::env::current_dir()?; + + let plugin = match Builder::new(tokio::io::stdin(), tokio::io::stdout()) + .option(OPTION_REST_PORT) + .option(OPTION_REST_MSG_BUFFER_SIZE) + // TODO: Use the catch-all subscribe method + // However, doing this breaks the plugin at the time begin + // We should fix this + // .subscribe("*", handle_notification) + .subscribe("block_added", handle_notification) + .subscribe("channel_open_failed", handle_notification) + .subscribe("channel_opened", handle_notification) + .subscribe("channel_state_changed", handle_notification) + .subscribe("connect", handle_notification) + .subscribe("custommsg", handle_notification) + .configure() + .await? + { + Some(p) => p, + None => return Ok(()), + }; + + let bind_port = match plugin.option(&OPTION_REST_PORT)? { + Some(port) => port, + None => { + log::info!("'rest-port' options i not configured. exiting."); + plugin.disable("Missing 'rest-port' option").await?; + return Ok(()); + } + }; + + let buffer_size: i64 = plugin.option(&OPTION_REST_MSG_BUFFER_SIZE)?; + let buffer_size = match usize::try_from(buffer_size) { + Ok(b) => b, + Err(_) => { + plugin + .disable("'rest-msg-buffer-size' should be strictly positive") + .await?; + return Ok(()); + } + }; + + let (sender, _) = broadcast::channel(buffer_size); + + let (identity, _ca_cert) = tls::init(&directory)?; + + let state = PluginState { + rpc_path: PathBuf::from(plugin.configuration().rpc_file.as_str()), + identity, + events: sender, + }; + + let plugin = plugin.start(state.clone()).await?; + let state = Arc::new(state); + + let bind_addr: SocketAddr = format!("0.0.0.0:{}", bind_port).parse()?; + + tokio::select! { + _ = plugin.join() => { + // This will likely never be shown, if we got here our + // parent process is exiting and not processing out log + // messages anymore. + debug!("Plugin loop terminated") + } + e = run_interface(bind_addr, state) => { + warn!("Error running REST interface: {:?}", e) + } + } + Ok(()) +} + +async fn run_interface(bind_addr: SocketAddr, state: Arc) -> Result<()> { + debug!( + "Connecting to {:?} and serving REST on {:?}", + &state.rpc_path, &bind_addr + ); + let cert = rustls_pemfile::certs(&mut state.identity.certificate.reader()) + .last() + .ok_or_else(|| anyhow!("Missing certificate"))??; + let key = rustls_pemfile::private_key(&mut state.identity.key.reader())? + .ok_or_else(|| anyhow!("Missing key"))?; + let mut server_config = ServerConfig::builder() + .with_no_client_auth() + .with_single_cert(vec![cert], key)?; + server_config.alpn_protocols = vec![b"h2".to_vec(), b"http/1.1".to_vec(), b"http/1.0".to_vec()]; + let tls_acceptor = TlsAcceptor::from(Arc::new(server_config)); + + let listener = TcpListener::bind(bind_addr).await?; + loop { + let (tcp_stream, _) = listener.accept().await?; + let tls_acceptor = tls_acceptor.clone(); + let rpc_path = state.rpc_path.clone(); + tokio::spawn(async move { + let tls_stream = match tls_acceptor.accept(tcp_stream).await { + Ok(tls_stream) => tls_stream, + Err(err) => { + debug!("Failed to perform tls handshake: {err:#}"); + return; + } + }; + let io = TokioIo::new(tls_stream); + let svc = + hyper::service::service_fn(move |req| handle_request(req, rpc_path.to_path_buf())); + if let Err(err) = HyperBuilder::new(TokioExecutor::new()) + .serve_connection(io, svc) + .await + { + error!("REST server error: {}", err); + } + }); + } +} + +async fn handle_request( + request: Request, + rpc_path: PathBuf, +) -> Result>> { + let rune = match request.headers().get("rune") { + Some(rune) => match rune.to_str() { + Ok(rune) => rune.to_string(), + Err(_) => { + return respond( + StatusCode::UNAUTHORIZED, + "Rune should only contain ASCII chars", + ) + } + }, + None => return respond(StatusCode::UNAUTHORIZED, "Missing rune"), + }; + + let method = request + .uri() + .path() + .to_string() + .trim_start_matches("/v1/") + .to_string(); + + let json_body: serde_json::Value = if request.size_hint().lower() > 0 { + let whole_body = match request.collect().await { + Ok(parts) => parts.aggregate(), + Err(_) => return respond(StatusCode::BAD_REQUEST, "Bad Request"), + }; + match serde_json::from_reader(whole_body.reader()) { + Ok(value) => value, + Err(_) => return respond(StatusCode::BAD_REQUEST, "Invalid JSON body"), + } + } else { + json!({}) + }; + let request = json!({ + "method": method, + "params": json_body.clone(), + "rune": rune, + }); + + let mut rpc_client = match ClnRpc::new(rpc_path).await { + Ok(client) => client, + Err(e) => { + error!("REST server could not connect to rpc socket: {}", e); + return respond(StatusCode::INTERNAL_SERVER_ERROR, "Internal Server Error"); + } + }; + match rpc_client + .call_raw::("checkrune", &request) + .await + { + Ok(check_rune) => { + if !check_rune.valid { + return respond(StatusCode::UNAUTHORIZED, "Unauthorized rune"); + } + } + Err(e) => { + error!("REST server received error from rpc socket: {}", e); + return respond(StatusCode::INTERNAL_SERVER_ERROR, "Internal Server Error"); + } + }; + let bytes = match rpc_client.call_raw(&method, &json_body).await { + Ok(result) => match serde_json::to_vec::(&result) { + Ok(bytes) => bytes, + Err(e) => { + error!( + "REST server received invalid response from rpc socket: {}", + e + ); + return respond(StatusCode::INTERNAL_SERVER_ERROR, "Internal Server Error"); + } + }, + Err(e) => { + error!("REST server received error from rpc socket: {}", e); + return respond(StatusCode::INTERNAL_SERVER_ERROR, "Internal Server Error"); + } + }; + Ok(Response::new(Full::::from(bytes))) +} + +fn respond(code: StatusCode, body: &'static str) -> Result>> { + match Response::builder() + .status(code) + .body(Full::::from(body)) + { + Ok(r) => Ok(r), + Err(_) => Ok(Response::builder() + .status(StatusCode::INTERNAL_SERVER_ERROR) + .body(Full::::default())?), + } +} + +async fn handle_notification(plugin: Plugin, value: serde_json::Value) -> Result<()> { + let notification: Result = serde_json::from_value(value); + match notification { + Err(err) => { + debug!("Failed to parse notification from lightningd {:?}", err); + } + Ok(notification) => { + if let Err(e) = plugin.state().events.send(notification) { + warn!("Failed to broadcast notification {:?}", e) + } + } + }; + Ok(()) +} diff --git a/plugins/rest-plugin/src/tls.rs b/plugins/rest-plugin/src/tls.rs new file mode 100644 index 000000000000..15497672a06a --- /dev/null +++ b/plugins/rest-plugin/src/tls.rs @@ -0,0 +1,116 @@ +//! Utilities to manage TLS certificates. +use anyhow::{Context, Result}; +use log::debug; +use rcgen::{Certificate, KeyPair}; +use std::path::Path; + +/// Just a wrapper around a certificate and an associated keypair. +#[derive(Clone, Debug)] +pub(crate) struct Identity { + pub key: Vec, + pub certificate: Vec, +} + +impl Identity { + fn to_certificate(&self) -> Result { + let keystr = String::from_utf8_lossy(&self.key); + let key = KeyPair::from_pem(&keystr)?; + let certstr = String::from_utf8_lossy(&self.certificate); + let params = rcgen::CertificateParams::from_ca_cert_pem(&certstr, key)?; + let cert = Certificate::from_params(params)?; + Ok(cert) + } +} + +/// Ensure that we have a certificate authority, and child keypairs +/// and certificates for the server and the client. It'll generate +/// them in the provided `directory`. The following files are +/// included: +/// +/// - `ca.pem`: The self-signed certificate of the CA +/// - `ca-key.pem`: The key used by the CA to sign certificates +/// - `server.pem`: The server certificate, signed by the CA +/// - `server-key.pem`: The server private key +/// - `client.pem`: The client certificate, signed by the CA +/// - `client-key.pem`: The client private key +/// +/// The `grpc-plugin` will use the `server.pem` certificate, while a +/// client is supposed to use the `client.pem` and associated +/// keys. Notice that this isn't strictly necessary since the server +/// will accept any client that is signed by the CA. In future we +/// might add runes, making the distinction more important. +/// +/// Returns the server identity and the root CA certificate. +pub(crate) fn init(directory: &Path) -> Result<(Identity, Vec)> { + let ca = generate_or_load_identity("cln Root CA", directory, "ca", None)?; + let server = generate_or_load_identity("cln rest Server", directory, "server", Some(&ca))?; + let _client = generate_or_load_identity("cln rest Client", directory, "client", Some(&ca))?; + Ok((server, ca.certificate)) +} + +/// Generate a given identity +fn generate_or_load_identity( + name: &str, + directory: &Path, + filename: &str, + parent: Option<&Identity>, +) -> Result { + use std::io::Write; + use std::os::unix::fs::PermissionsExt; + // Just our naming convention here. + let cert_path = directory.join(format!("{}.pem", filename)); + let key_path = directory.join(format!("{}-key.pem", filename)); + // Did we have to generate a new key? In that case we also need to + // regenerate the certificate + if !key_path.exists() || !cert_path.exists() { + debug!( + "Generating a new keypair in {:?}, it didn't exist", + &key_path + ); + let keypair = KeyPair::generate(&rcgen::PKCS_ECDSA_P256_SHA256)?; + + // Create the file, but make it user-readable only: + let mut file = std::fs::File::create(&key_path)?; + let mut perms = std::fs::metadata(&key_path)?.permissions(); + perms.set_mode(0o600); + std::fs::set_permissions(&key_path, perms)?; + + // Only after changing the permissions we can write the + // private key + file.write_all(keypair.serialize_pem().as_bytes())?; + drop(file); + + debug!( + "Generating a new certificate for key {:?} at {:?}", + &key_path, &cert_path + ); + + // Configure the certificate we want. + let subject_alt_names = vec!["cln".to_string(), "localhost".to_string()]; + let mut params = rcgen::CertificateParams::new(subject_alt_names); + params.key_pair = Some(keypair); + params.alg = &rcgen::PKCS_ECDSA_P256_SHA256; + if parent.is_none() { + params.is_ca = rcgen::IsCa::Ca(rcgen::BasicConstraints::Unconstrained); + } else { + params.is_ca = rcgen::IsCa::NoCa; + } + params + .distinguished_name + .push(rcgen::DnType::CommonName, name); + + let cert = Certificate::from_params(params)?; + std::fs::write( + &cert_path, + match parent { + None => cert.serialize_pem()?, + Some(ca) => cert.serialize_pem_with_signer(&ca.to_certificate()?)?, + }, + ) + .context("writing certificate to file")?; + } + + let key = std::fs::read(&key_path)?; + let certificate = std::fs::read(cert_path)?; + Ok(Identity { certificate, key }) +}