odds and ends: tls SAN cfg and payer note option

config_spec.toml

@@ -7,26 +7,29 @@ type = "String"
 optional = false
 doc = "LND GRPC address, kindly note that the address must start with https:// ip address : port."
 
-
 [[param]]
 name = "cert_path"
 type = "std::path::PathBuf"
 optional = true
 doc = "The path to LND tls certificate file. Note: the abosolute tls certificate file path is required here."
 
-
 [[param]]
-name = "macaroon_path"
-type = "std::path::PathBuf"
+name = "cert_pem"
+type = "String"
 optional = true
-doc = "The path to LND macaroon file. Note: the abosolute macaroon file path is required here."
+doc = "The PEM-encoded tls certificate to pass directly into LNDK."
 
 [[param]]
-name = "cert_pem"
+name = "tls_ip"
 type = "String"
 optional = true
-doc = "The PEM-encoded tls certificate to pass directly into LNDK."
+doc = "Add an ip or domain to the certificate used to access the LNDK server. To add multiple ip addresses, separate each ip address with a comma. Like: '192.168.0.1,lndkisdope.org'"
 
+[[param]]
+name = "macaroon_path"
+type = "std::path::PathBuf"
+optional = true
+doc = "The path to LND macaroon file. Note: the abosolute macaroon file path is required here."
 
 [[param]]
 name = "macaroon_hex"

docs/cli_commands.md

@@ -62,6 +62,22 @@ which you can do in [most languages](https://grpc.io/docs/languages/).
 Again, since LNDK needs to connect to LND, you'll need to pass in your LND macaroon to establish a connection. Note that:
 - The client must pass in this data via gRPC metadata. You can find an example of this in the [Rust client](https://github.com/lndk-org/lndk/blob/master/src/cli.rs) used to connect `lndk-cli` to the server.
 
+## Baking a custom macaroon
+
+Rather than use the admin.macaroon with unrestricted permission to an LND node, we can bake a macaroon using lncli with much more specific permissions for better security. Note also that the macaroon required for [starting up a LNDK instance](https://github.com/lndk-org/lndk?tab=readme-ov-file#custom-macaroon) requires different permissions than when making a payment.
+
+When using `pay-offer`, you can generate a macaroon which will give LNDK only the specific grpc endpoints it needs to hit:
+
+```
+lncli bakemacaroon --save_to=<FILEPATH>/lndk-pay.macaroon uri:/walletrpc.WalletKit/DeriveKey uri:/signrpc.Signer/SignMessage uri:/lnrpc.Lightning/GetNodeInfo uri:/lnrpc.Lightning/ConnectPeer uri:/lnrpc.Lightning/GetInfo uri:/lnrpc.Lightning/ListPeers uri:/lnrpc.Lightning/GetChanInfo uri:/lnrpc.Lightning/QueryRoutes uri:/routerrpc.Router/SendToRouteV2 uri:/routerrpc.Router/TrackPaymentV2
+```
+
+If you're using just the `get-invoice` command, you can bake a macaroon with less permissions:
+
+```
+lncli bakemacaroon --save_to=<FILEPATH>/lndk-pay.macaroon uri:/walletrpc.WalletKit/DeriveKey uri:/signrpc.Signer/SignMessage uri:/lnrpc.Lightning/GetNodeInfo uri:/lnrpc.Lightning/ConnectPeer uri:/lnrpc.Lightning/GetInfo uri:/lnrpc.Lightning/ListPeers uri:/lnrpc.Lightning/GetChanInfo
+```
+
 ## TLS: Running `lndk-cli` remotely
 
 When `LNDK` is started up, self-signed TLS credentials are automatically generated and stored in `~/.lndk`. If you're running `lndk-cli` locally, it'll know where to find the certificate file it needs to establish a secure connection with the LNDK server.

proto/lndkrpc.proto

@@ -11,6 +11,7 @@ service Offers {
 message PayOfferRequest {
    string offer = 1;
    optional uint64 amount = 2;
+   optional string payer_note = 3;
 }
 
 message PayOfferResponse {
@@ -20,6 +21,7 @@ message PayOfferResponse {
 message GetInvoiceRequest {
     string offer = 1;
     optional uint64 amount = 2;
+    optional string payer_note = 3;
 }
 
 message DecodeInvoiceRequest {
@@ -52,6 +54,7 @@ message Bolt12InvoiceContents {
     PublicKey node_id = 9;
     string signature = 10;
     repeated FeatureBit features = 11;
+    optional string payer_note = 12;
 }
 
 message PaymentHash {

src/cli.rs

@@ -81,16 +81,25 @@ enum Commands {
         /// whatever the offer amount is.
         #[arg(required = false)]
         amount: Option<u64>,
+
+        /// A payer-provided note which will be seen by the recipient.
+        #[arg(required = false)]
+        payer_note: Option<String>,
     },
     /// GetInvoice fetch a BOLT 12 invoice, which will be returned as a hex-encoded string. It
     /// fetches the invoice from a BOLT 12 offer, provided as a 'lno'-prefaced offer string.
     GetInvoice {
         /// The offer string.
         offer_string: String,
+
         /// Amount the user would like to pay. If this isn't set, we'll assume the user is paying
         /// whatever the offer amount is.
         #[arg(required = false)]
         amount: Option<u64>,
+
+        /// A payer-provided note which will be seen by the recipient.
+        #[arg(required = false)]
+        payer_note: Option<String>,
     },
     /// PayInvoice pays a hex-encoded BOLT12 invoice.
     PayInvoice {
@@ -144,9 +153,10 @@ async fn main() {
         Commands::PayOffer {
             ref offer_string,
             amount,
+            payer_note,
         } => {
-            let tls = read_cert_from_args(&args);
-            let grpc_host = args.grpc_host.clone();
+            let tls = read_cert_from_args(args.cert_pem);
+            let grpc_host = args.grpc_host;
             let grpc_port = args.grpc_port;
             let channel = Channel::from_shared(format!("{grpc_host}:{grpc_port}"))
                 .unwrap_or_else(|e| {
@@ -179,10 +189,12 @@ async fn main() {
                 }
             };
 
-            let macaroon = read_macaroon_from_args(&args);
+            let macaroon =
+                read_macaroon_from_args(args.macaroon_path, args.macaroon_hex, &args.network);
             let mut request = Request::new(PayOfferRequest {
                 offer: offer.to_string(),
                 amount,
+                payer_note,
             });
             add_metadata(&mut request, macaroon).unwrap_or_else(|_| exit(1));
 
@@ -197,9 +209,10 @@ async fn main() {
         Commands::GetInvoice {
             ref offer_string,
             amount,
+            payer_note,
         } => {
-            let tls = read_cert_from_args(&args);
-            let grpc_host = args.grpc_host.clone();
+            let tls = read_cert_from_args(args.cert_pem);
+            let grpc_host = args.grpc_host;
             let grpc_port = args.grpc_port;
             let channel = Channel::from_shared(format!("{grpc_host}:{grpc_port}"))
                 .unwrap_or_else(|e| {
@@ -231,10 +244,12 @@ async fn main() {
                 }
             };
 
-            let macaroon = read_macaroon_from_args(&args);
+            let macaroon =
+                read_macaroon_from_args(args.macaroon_path, args.macaroon_hex, &args.network);
             let mut request = Request::new(GetInvoiceRequest {
                 offer: offer.to_string(),
                 amount,
+                payer_note,
             });
             add_metadata(&mut request, macaroon).unwrap_or_else(|_| exit(1));
             match client.get_invoice(request).await {
@@ -251,7 +266,7 @@ async fn main() {
             ref invoice_string,
             amount,
         } => {
-            let tls = read_cert_from_args(&args);
+            let tls = read_cert_from_args(args.cert_pem.clone());
             let grpc_host = args.grpc_host.clone();
             let grpc_port = args.grpc_port;
             let channel = Channel::from_shared(format!("{grpc_host}:{grpc_port}"))
@@ -272,7 +287,8 @@ async fn main() {
                 });
 
             let mut client = OffersClient::new(channel);
-            let macaroon = read_macaroon_from_args(&args);
+            let macaroon =
+                read_macaroon_from_args(args.macaroon_path, args.macaroon_hex, &args.network);
             let mut request = Request::new(PayInvoiceRequest {
                 invoice: invoice_string.to_owned(),
                 amount,
@@ -307,9 +323,9 @@ fn read_macaroon_from_file(path: PathBuf) -> Result<String, std::io::Error> {
     Ok(hex::encode(buffer))
 }
 
-fn read_cert_from_args(args: &Cli) -> ClientTlsConfig {
+fn read_cert_from_args(cert_pem: Option<String>) -> ClientTlsConfig {
     let data_dir = home::home_dir().unwrap().join(DEFAULT_DATA_DIR);
-    let pem = match &args.cert_pem {
+    let pem = match &cert_pem {
         Some(pem) => pem.clone(),
         None => {
             // If no cert pem string is provided, we'll look for the tls certificate in the
@@ -326,24 +342,28 @@ fn read_cert_from_args(args: &Cli) -> ClientTlsConfig {
         .domain_name("localhost")
 }
 
-fn read_macaroon_from_args(args: &Cli) -> String {
+fn read_macaroon_from_args(
+    macaroon_path: Option<PathBuf>,
+    macaroon_hex: Option<String>,
+    network: &str,
+) -> String {
     // Make sure both macaroon options are not set.
-    if args.macaroon_path.is_some() && args.macaroon_hex.is_some() {
+    if macaroon_path.is_some() && macaroon_hex.is_some() {
         println!("ERROR: Only one of `macaroon_path` or `macaroon_hex` should be set.");
         exit(1)
     }
 
     // Let's grab the macaroon string now. If neither macaroon_path nor macaroon_hex are
     // set, use the default macaroon path.
-    match &args.macaroon_path {
+    match macaroon_path {
         Some(path) => read_macaroon_from_file(path.clone()).unwrap_or_else(|e| {
             println!("ERROR reading macaroon from file {e:?}");
             exit(1)
         }),
-        None => match &args.macaroon_hex {
+        None => match &macaroon_hex {
             Some(macaroon) => macaroon.clone(),
             None => {
-                let path = get_macaroon_path_default(&args.network.clone());
+                let path = get_macaroon_path_default(network);
                 read_macaroon_from_file(path).unwrap_or_else(|e| {
                     println!("ERROR reading macaroon from file {e:?}");
                     exit(1)

src/lib.rs

@@ -274,6 +274,7 @@ pub struct PaymentInfo {
 pub struct PayOfferParams {
     pub offer: Offer,
     pub amount: Option<u64>,
+    pub payer_note: Option<String>,
     pub network: Network,
     pub client: Client,
     /// The destination the offer creator provided, which we will use to send the invoice request.
@@ -318,9 +319,9 @@ impl OfferHandler {
             .create_invoice_request(
                 cfg.client.clone(),
                 cfg.offer.clone(),
-                vec![],
                 cfg.network,
                 cfg.amount,
+                cfg.payer_note,
             )
             .await?;
 

src/lndk_offers.rs

@@ -4,12 +4,13 @@ use async_trait::async_trait;
 use bitcoin::hashes::sha256::Hash;
 use bitcoin::network::constants::Network;
 use bitcoin::secp256k1::schnorr::Signature;
-use bitcoin::secp256k1::{PublicKey, Secp256k1};
+use bitcoin::secp256k1::{PublicKey, Secp256k1, SignOnly};
 use futures::executor::block_on;
 use lightning::blinded_path::{BlindedPath, Direction, IntroductionNode};
 use lightning::ln::channelmanager::PaymentId;
 use lightning::offers::invoice_request::{
-    InvoiceRequest, SignInvoiceRequestFn, UnsignedInvoiceRequest,
+    ExplicitPayerId, InvoiceRequest, InvoiceRequestBuilder, SignInvoiceRequestFn,
+    UnsignedInvoiceRequest,
 };
 use lightning::offers::merkle::SignError;
 use lightning::offers::offer::{Amount, Offer};
@@ -176,9 +177,9 @@ impl OfferHandler {
         &self,
         mut signer: impl MessageSigner + std::marker::Send + 'static,
         offer: Offer,
-        _metadata: Vec<u8>,
         network: Network,
         msats: Option<u64>,
+        payer_note: Option<String>,
     ) -> Result<(InvoiceRequest, PaymentId, u64), OfferError> {
         let validated_amount = validate_amount(offer.amount(), msats).await?;
 
@@ -203,7 +204,7 @@ impl OfferHandler {
         // invoice once returned from the offer maker. Once we get an invoice back, this metadata
         // will help us to determine: 1) That the invoice is truly for the invoice request we sent.
         // 2) We don't pay duplicate invoices.
-        let unsigned_invoice_req = offer
+        let builder: InvoiceRequestBuilder<'_, '_, ExplicitPayerId, SignOnly> = offer
             .request_invoice_deriving_metadata(
                 pubkey,
                 &self.expanded_key,
@@ -214,10 +215,15 @@ impl OfferHandler {
             .chain(network)
             .map_err(OfferError::BuildUIRFailure)?
             .amount_msats(validated_amount)
-            .map_err(OfferError::BuildUIRFailure)?
-            .build()
             .map_err(OfferError::BuildUIRFailure)?;
 
+        let builder = match payer_note {
+            Some(payer_note_str) => builder.payer_note(payer_note_str),
+            None => builder,
+        };
+
+        let unsigned_invoice_req = builder.build().map_err(OfferError::BuildUIRFailure)?;
+
         // To create a valid invoice request, we also need to sign it. This is spawned in a blocking
         // task because we need to call block_on on sign_message so that sign_closure can be a
         // synchronous closure.
@@ -799,7 +805,13 @@ mod tests {
         let offer = decode(get_offer()).unwrap();
         let handler = OfferHandler::new();
         let resp = handler
-            .create_invoice_request(signer_mock, offer, vec![], Network::Regtest, Some(amount))
+            .create_invoice_request(
+                signer_mock,
+                offer,
+                Network::Regtest,
+                Some(amount),
+                Some("".to_string()),
+            )
             .await;
         assert!(resp.is_ok())
     }
@@ -819,7 +831,13 @@ mod tests {
         let offer = decode(get_offer()).unwrap();
         let handler = OfferHandler::new();
         assert!(handler
-            .create_invoice_request(signer_mock, offer, vec![], Network::Regtest, Some(10000))
+            .create_invoice_request(
+                signer_mock,
+                offer,
+                Network::Regtest,
+                Some(10000),
+                Some("".to_string())
+            )
             .await
             .is_err())
     }
@@ -842,7 +860,13 @@ mod tests {
         let offer = decode(get_offer()).unwrap();
         let handler = OfferHandler::new();
         assert!(handler
-            .create_invoice_request(signer_mock, offer, vec![], Network::Regtest, Some(10000))
+            .create_invoice_request(
+                signer_mock,
+                offer,
+                Network::Regtest,
+                Some(10000),
+                Some("".to_string())
+            )
             .await
             .is_err())
     }

src/main.rs

@@ -85,7 +85,7 @@
 
     // The user passed in a TLS cert to help us establish a secure connection to LND. But now we
     // need to generate a TLS credentials for connecting securely to the LNDK server.
-    generate_tls_creds(data_dir.clone()).map_err(|e| {
+    generate_tls_creds(data_dir.clone(), config.tls_ip).map_err(|e| {
         error!("Error generating tls credentials: {e}");
     })?;
     let identity = read_tls(data_dir).map_err(|e| {