feat(signer)!: add proxy keys (Commit-Boost#39)

* feat(signer)!: add proxy keys

- add `generate_proxy_keys` endpoint to the Signer API. Modify the signer client accordingly.

- add a `.dockerignore` file

- remove the need for modules to provide their id in requests. A module's JWT is now solely sufficient to identify the module.
  * `SigningService` now contains jwt <-> module_id in a bidirectional hashmap

- add authentication middleware to the signer service instead of manual auth in the handlers

- introduce `ModuleId` and `Jwt` wrapper types around strings to improve semantics (useful after a couple of mishaps with key <-> value directions across the different maps)
  * see `common::types`

- add example proxy key generation request in `da_commit` module

- small misc changes

- small reformatting

* chore(clippy): remove unnecessary `clone`

* chore(signer): remove `SignerModuleError::UnknownModuleId`

not needed anymore since JWTs now uniquely identify the module

* feat(docs)!: update with proxy keys

* chore(da_commit): add proxy key example

* chore: resolve TODO

* also, add `rust-toolchain.toml`

* chore: fix typo

* chore: move dependency to workspace

* chore: sync rust version in docs

* chore: reexport `SignedProxyDelegation` from prelude

* chore: use `fmt::Display` of `ModuleId` in traces

* chore: rename field back to `message`

* chore: make log level `error`

* chore: remove TODO

* fix: error log on module startup

Author: David Petrov

.dockerignore

@@ -1 +1,5 @@
-target
+target
+Dockerfile
+.dockerignore
+.git
+.gitignore

Cargo.toml

@@ -79,3 +79,5 @@ rand = "0.8.5"
 dotenvy = "0.15.7"
 indexmap = "2.2.6"
 lazy_static = "1.5.0"
+bimap = { version = "0.6.3", features = ["serde"] }
+derive_more = "0.99.18"

README.md

@@ -2,7 +2,7 @@
 
 A new Ethereum validator sidecar focused on standardizing the last mile of communication between validators and third-party protocols.
 
-[Docs](https://commit-boost.github.io/commit-boost-client/) | 
+[Docs](https://commit-boost.github.io/commit-boost-client/) |
 [Twitter](https://x.com/Commit_Boost)
 
 ## Overview
@@ -51,7 +51,7 @@ async fn main() {
     let pubkey = *pubkeys.consensus.first().unwrap();
 
     let datagram = Datagram { data: 42 };
-    let request = SignRequest::builder(config.id, pubkey).with_msg(&datagram);
+    let request = SignRequest::builder(pubkey).with_msg(&datagram);
     let signature = config
         .signer_client
         .request_signature(&request)

api/signer-api.yml

@@ -11,6 +11,8 @@ paths:
       summary: Get a list of public keys for which signatures may be requested
       tags:
         - Signer
+      security:
+        - BearerAuth: []
       responses:
         "200":
           description: A list of Bls pubkeys
@@ -35,7 +37,6 @@ paths:
                       format: hex
                       pattern: "^0x[a-fA-F0-9]{96}$"
                       example: "0xa3ffa9241f78279f1af04644cb8c79c2d8f02bcf0e28e2f186f6dcccac0a869c2be441fda50f0dea895cfce2e53f0989"
-
         "500":
           description: Internal error
           content:
@@ -67,10 +68,6 @@ paths:
             schema:
               type: object
               properties:
-                id:
-                  description: The module ID
-                  type: string
-                  example: "MY_MODULE_ID"
                 pubkey:
                   description: BLS public key of validator
                   type: string
@@ -99,7 +96,7 @@ paths:
                 pattern: "^0x[a-fA-F0-9]{192}$"
                 example: "0xa3ffa9241f78279f1af04644cb8c79c2d8f02bcf0e28e2f186f6dcccac0a869c2be441fda50f0dea895cfce2e53f0989a3ffa9241f78279f1af04644cb8c79c2d8f02bcf0e28e2f186f6dcccac0a869c2be441fda50f0dea895cfce2e53f0989"
         "404":
-          description: Unknown value (pubkey, module id)
+          description: Unknown value (pubkey, etc.)
           content:
             application/json:
               schema:
@@ -130,6 +127,89 @@ paths:
                   message:
                     type: string
                     example: "Internal error"
+
+  /signer/v1/generate_proxy_key:
+    post:
+      summary: Request a proxy key be generated for a specific consensus pubkey
+      tags:
+        - Signer
+      security:
+        - BearerAuth: []
+      requestBody:
+        required: true
+        content:
+          application/json:
+            schema:
+              type: object
+              properties:
+                pubkey:
+                  description: a validator BLS public key for which to generate a proxy key
+                  type: string
+                  format: hex
+                  pattern: "^0x[a-fA-F0-9]{96}$"
+                  example: "0xac5e059177afc33263e95d0be0690138b9a1d79a6e19018086a0362e0c30a50bf9e05a08cb44785724d0b2718c5c7118"
+      responses:
+        "200":
+          description: Successs
+          content:
+            application/json:
+              schema:
+                type: object
+                properties:
+                  message:
+                    type: object
+                    properties:
+                      delegator:
+                        description: the validator BLS public key for which the proxy key was generated (the same one as requested)
+                        type: string
+                        format: hex
+                        pattern: "^0x[a-fA-F0-9]{96}$"
+                        example: "0xac5e059177afc33263e95d0be0690138b9a1d79a6e19018086a0362e0c30a50bf9e05a08cb44785724d0b2718c5c7118"
+                      proxy:
+                        description: the generated proxy public key
+                        type: string
+                        format: hex
+                        pattern: "^0x[a-fA-F0-9]{96}$"
+                        example: "0x8a481a7a51c430a9bafa64366bc4934f5880f5f1d97646f91680936a53f2a268fdde5369430a2b4bb700c5f82cfbab3f"
+                  signature:
+                    description: The signature of the proxy delegation
+                    type: string
+                    format: hex
+                    pattern: "^0x[a-fA-F0-9]{192}$"
+                    example: "0xabfacf1cd17d80abfc6fa6b8e534ab25cdb1f95a855706ef604672c8695401a84c7834008e57925d4259c551b7c03d1a16f05b082294fadcba802a61a5cccfb5e96dd1dce4c9dac3f6d15254495019146346670be1f374a67cb0cda2aaf72d00"
+        "404":
+          description: Unknown value (pubkey, etc.)
+          content:
+            application/json:
+              schema:
+                type: object
+                required:
+                  - code
+                  - message
+                properties:
+                  code:
+                    type: number
+                    example: 404
+                  message:
+                    type: string
+                    example: "Unknown pubkey"
+        "500":
+          description: Internal error
+          content:
+            application/json:
+              schema:
+                type: object
+                required:
+                  - code
+                  - message
+                properties:
+                  code:
+                    type: number
+                    example: 500
+                  message:
+                    type: string
+                    example: "Internal error"
+
 components:
   securitySchemes:
     BearerAuth:

bin/src/lib.rs

@@ -1,7 +1,7 @@
 pub mod prelude {
     pub use cb_common::{
         commit,
-        commit::request::SignRequest,
+        commit::request::{SignRequest, SignedProxyDelegation},
         config::{load_builder_module_config, load_commit_module_config, StartCommitModuleConfig},
         pbs::{BuilderEvent, BuilderEventClient, OnBuilderApiEvent},
         utils::{initialize_tracing_log, utcnow_ms, utcnow_ns, utcnow_sec, utcnow_us},

crates/common/Cargo.toml

@@ -41,3 +41,5 @@ thiserror.workspace = true
 eyre.workspace = true
 url.workspace = true
 rand.workspace = true
+bimap.workspace = true
+derive_more.workspace = true

crates/common/src/commit/client.rs

@@ -6,9 +6,9 @@ use reqwest::header::{HeaderMap, HeaderValue, AUTHORIZATION};
 use serde::{Deserialize, Serialize};
 
 use super::{
-    constants::{GET_PUBKEYS_PATH, REQUEST_SIGNATURE_PATH},
+    constants::{GENERATE_PROXY_KEY_PATH, GET_PUBKEYS_PATH, REQUEST_SIGNATURE_PATH},
     error::SignerClientError,
-    request::SignRequest,
+    request::{GenerateProxyRequest, SignRequest, SignedProxyDelegation},
 };
 use crate::DEFAULT_REQUEST_TIMEOUT;
 
@@ -87,4 +87,27 @@ impl SignerClient {
 
         Ok(signature)
     }
+
+    pub async fn generate_proxy_key(
+        &self,
+        pubkey: BlsPublicKey,
+    ) -> Result<SignedProxyDelegation, SignerClientError> {
+        let url = format!("{}{}", self.url, GENERATE_PROXY_KEY_PATH);
+        let request = GenerateProxyRequest::new(pubkey);
+        let res = self.client.post(&url).json(&request).send().await?;
+
+        let status = res.status();
+        let response_bytes = res.bytes().await?;
+
+        if !status.is_success() {
+            return Err(SignerClientError::FailedRequest {
+                status: status.as_u16(),
+                error_msg: String::from_utf8_lossy(&response_bytes).into_owned(),
+            });
+        }
+
+        let signed_proxy_delegation = serde_json::from_slice(&response_bytes)?;
+
+        Ok(signed_proxy_delegation)
+    }
 }

crates/common/src/commit/constants.rs

@@ -1,2 +1,3 @@
 pub const GET_PUBKEYS_PATH: &str = "/signer/v1/get_pubkeys";
 pub const REQUEST_SIGNATURE_PATH: &str = "/signer/v1/request_signature";
+pub const GENERATE_PROXY_KEY_PATH: &str = "/signer/v1/generate_proxy_key";

crates/common/src/commit/error.rs

@@ -6,7 +6,7 @@ pub enum SignerClientError {
     #[error("invalid header value: {0}")]
     InvalidHeader(#[from] reqwest::header::InvalidHeaderValue),
 
-    #[error("failed request: status {status} msg {error_msg}")]
+    #[error("failed request: status {status}; message: \"{error_msg}\"")]
     FailedRequest { status: u16, error_msg: String },
 
     #[error("serde decode error: {0}")]

crates/common/src/commit/request.rs

@@ -34,24 +34,22 @@ impl SignedProxyDelegation {
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct SignRequest {
-    pub id: String,
     pub pubkey: BlsPublicKey,
     pub is_proxy: bool,
     pub object_root: [u8; 32],
 }
 
 impl SignRequest {
     pub fn new(
-        id: impl Into<String>,
         pubkey: BlsPublicKey,
         is_proxy: bool,
         object_root: [u8; 32],
     ) -> SignRequest {
-        Self { id: id.into(), pubkey, is_proxy, object_root }
+        Self { pubkey, is_proxy, object_root }
     }
 
-    pub fn builder(id: impl Into<String>, pubkey: BlsPublicKey) -> Self {
-        Self::new(id, pubkey, false, [0; 32])
+    pub fn builder(pubkey: BlsPublicKey) -> Self {
+        Self::new(pubkey, false, [0; 32])
     }
 
     pub fn is_proxy(self) -> Self {
@@ -63,6 +61,17 @@ impl SignRequest {
     }
 
     pub fn with_msg(self, msg: &impl TreeHash) -> Self {
-        Self { object_root: msg.tree_hash_root().0, ..self }
+        self.with_root(msg.tree_hash_root().0)
+    }
+}
+
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct GenerateProxyRequest {
+    pub pubkey: BlsPublicKey,
+}
+
+impl GenerateProxyRequest {
+    pub fn new(pubkey: BlsPublicKey) -> Self {
+        GenerateProxyRequest { pubkey }
     }
 }