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Fix CI: patch RUSTSEC-2026-0185/0189, add Host allowlist and first tests #2

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Merged
cpoder merged 2 commits into from
Jul 27, 2026
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Fix CI: patch RUSTSEC-2026-0185/0189, add Host allowlist and first tests #2

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2061f54
Fix CI: patch RUSTSEC-2026-0185/0189, add Host allowlist
cpoder Jul 27, 2026
938f24c
Add scope and Host-allowlist tests
cpoder Jul 27, 2026
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3 changes: 2 additions & 1 deletion .github/workflows/ci.yml
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Expand Up @@ -31,7 +31,8 @@ jobs:
- uses: Swatinem/rust-cache@v2
with:
workspaces: mcp-server-rs
- run: cargo clippy --manifest-path mcp-server-rs/Cargo.toml -- -D warnings
# --all-targets so test code is linted too, not just the binary.
- run: cargo clippy --manifest-path mcp-server-rs/Cargo.toml --all-targets -- -D warnings

build:
name: Build & Test
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14 changes: 14 additions & 0 deletions README.md
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Expand Up @@ -203,6 +203,20 @@ Flow services are created via `wm.server.ns/putNode` which accepts the full flow
- **stdio** (default): Standard MCP stdio transport, works with all MCP clients
- **HTTP**: `wm-mcp-server --http 8080` starts a Streamable HTTP server at `/mcp` for MCP gateways

### Allowed hosts (HTTP mode)

To block DNS rebinding attacks, the HTTP transport validates the inbound `Host`
header and accepts **loopback only** (`localhost`, `127.0.0.1`, `::1`) by
default. Requests carrying any other `Host` get `403`.

If the server is reached under a real hostname, list it in `WM_ALLOWED_HOSTS`
(comma-separated). Entries are *added* to the loopback defaults:

```bash
WM_ALLOWED_HOSTS=mcp.example.com,mcp.example.com:8080
WM_ALLOWED_HOSTS='*' # disables Host validation entirely -- not recommended
```

### Tool scoping

Set `WM_SCOPES` to restrict which tools are exposed (useful for MCP gateways):
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124 changes: 28 additions & 96 deletions mcp-server-rs/Cargo.lock
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4 changes: 3 additions & 1 deletion mcp-server-rs/Cargo.toml
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Expand Up @@ -13,7 +13,9 @@ name = "wm-mcp-server"
path = "src/main.rs"

[dependencies]
rmcp = { version = "1.2", features = ["server", "transport-io", "transport-streamable-http-server", "macros"] }
# >=1.4 required: patches RUSTSEC-2026-0189 (DNS rebinding in the Streamable
# HTTP server transport) and provides the Host-allowlist builder API.
rmcp = { version = "1.8", features = ["server", "transport-io", "transport-streamable-http-server", "macros"] }
tokio = { version = "1", features = ["macros", "rt-multi-thread", "io-std", "net", "signal"] }
axum = "0.8"
tokio-util = { version = "0.7", features = ["rt"] }
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