Add LICENSE, README, AGENTS.md, and deployment setup guide
Dual MIT/Apache-2.0 license, public-facing README with quick start and config reference, step-by-step deploy/README.md for Docker and systemd setups, and AGENTS.md for LLM-assisted development.
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AGENTS.md
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# AGENTS.md
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Guidance for LLM agents (and humans) working on this project.
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## Project Overview
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A memory-safe reverse proxy built with Rust/axum that replaces vulnerable nginx
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installations. Terminates TLS, routes requests by Host header to upstream
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services, enforces rate limits, and injects proxy headers. See `README.md` and
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`docs/architecture/` for full details.
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## Build & Run
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```bash
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cargo build # debug build
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cargo build --release # release build
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cargo test # run all tests (unit + integration)
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cargo test -- --nocapture # run tests with stdout visible
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cargo clippy # lint
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reverse-proxy --config config.toml # run (defaults to /etc/reverse-proxy/config.toml)
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reverse-proxy --validate --config config.toml # validate config only
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```
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For a static binary with no libc dependency:
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```bash
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cargo build --release --target x86_64-unknown-linux-musl
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```
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## Project Structure
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```
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src/
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├── main.rs # Entry point, server startup, listener binding
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├── cli.rs # CLI parsing (clap), config loading, validation
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├── lib.rs # Library root, module declarations
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├── config/
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│ ├── static_config.rs # StaticConfig — immutable, requires restart
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│ ├── dynamic_config.rs# DynamicConfig — hot-reloadable via ArcSwap
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│ ├── validation.rs # Config validation rules (called at startup and reload)
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│ └── test_fixtures.rs # Test config generation helpers
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├── proxy/
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│ ├── handler.rs # Core reverse proxy handler (forward requests to upstream)
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│ ├── headers.rs # Proxy header injection (X-Real-IP, X-Forwarded-For, etc.)
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│ ├── body_limit.rs # Request body size limiting middleware
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│ ├── error.rs # Error response types (502, 504, 429, etc.)
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│ └── mod.rs # Router construction, client creation
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├── tls/
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│ ├── acceptor.rs # TLS acceptor setup (manual + ACME)
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│ ├── acme.rs # ACME certificate provisioning via rustls-acme
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│ ├── config.rs # TLS ServerConfig construction, cipher suites
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│ └── redirect.rs # HTTP → HTTPS 301 redirect listener
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├── rate_limit/
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│ ├── mod.rs # Rate limiting middleware, eviction task
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│ └── bucket.rs # Token bucket implementation (IPv4 /32, IPv6 /64)
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├── admin/
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│ ├── socket.rs # Unix domain socket admin API (reload, status)
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│ └── mod.rs
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├── health.rs # Health check endpoint on localhost:9900
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├── logging/
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│ ├── mod.rs # Logging init (file + stdout, ANSI disabled)
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│ └── format.rs # Structured log format (REQUEST, RATE_LIMIT, etc.)
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├── server.rs # HTTPS listener serving with ALPN detection
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├── shutdown.rs # Graceful shutdown (SIGTERM, SIGINT) + SIGHUP reload
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└── utils.rs # Shared utilities
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```
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## Key Architecture Concepts
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- **StaticConfig vs DynamicConfig**: Static config (bind addresses, TLS,
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ports) requires a restart. Dynamic config (sites, rate limits, body limits)
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can be reloaded at runtime via SIGHUP or admin socket, using `ArcSwap` for
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lock-free reads.
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- **Multi-listener**: `[[listeners]]` in TOML — each listener has its own bind
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address, TLS config, and site routing. Sites are collected into a global
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routing table at runtime.
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- **Edge proxy model**: The proxy is the edge — X-Forwarded-For is replaced
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(not appended), X-Real-IP is set from the connection's remote address.
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- **No `/health` on public listener**: Health checking is localhost:9900 only.
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The main listener does not intercept any paths.
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- **HTTP/2 client-facing only**: ALPN detects h2 vs http/1.1. Upstream
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connections are always HTTP/1.1.
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- **IPv6 rate limiting**: IPv6 addresses are normalized to /64 prefixes so
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addresses within the same /64 share a token bucket.
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## Config Format
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TOML. See `docs/architecture/config.md` for full schema. Key validation rules:
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- `bind_addr` must be explicit (no `0.0.0.0`) unless `allow_wildcard_bind` is
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enabled via config or `--allow-wildcard-bind` CLI flag (OR logic)
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- Site `host` values must be unique across all listeners
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- `upstream` must be in `host:port` format (e.g., `gitea:3000`, `127.0.0.1:3000`)
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- ACME mode requires `acme_domains` (non-empty) and `acme_contact` (valid
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`mailto:` URI)
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- Manual mode requires `cert_path` and `key_path` pointing to readable files
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- `rate_limit.requests_per_second` and `rate_limit.burst` must be > 0
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- `body.limit_bytes` must be > 0
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- `http_port` must be 0 (disabled) or 1–65535; `https_port` must be 1–65535
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- `health_check_port` must not conflict with any listener's http_port or
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https_port on the same bind address
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## Testing
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Tests use `rcgen` for self-signed certificate generation and `reqwest` for
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HTTP client requests. Integration tests are in `tests/integration_test.rs`
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with helpers in `tests/helpers/`.
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```bash
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cargo test # all tests
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cargo test --test integration # integration tests only
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cargo test --lib # unit tests only
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```
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## Code Style
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- No comments unless explicitly requested
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- Error handling uses `anyhow` for application code and `thiserror` for
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library error types
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- Structured logging with `tracing` — always `with_ansi(false)`
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- Config types implement `serde::Deserialize` for TOML parsing
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- All network operations use `tokio` async runtime
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## Deployment Files
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`deploy/` contains production-ready deployment configs:
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- `Dockerfile` — multi-stage build (rust:alpine → alpine)
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- `docker-compose.yml` — complete setup with Gitea example
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- `reverse-proxy.service` — systemd unit file with security hardening
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- `fail2ban/` — filter and jail config for rate limit log parsing
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See `deploy/README.md` for step-by-step setup instructions.
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## Common Modifications
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### Adding a new site
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Add a `[[listeners.sites]]` entry to config and reload:
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```bash
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echo "reload" | socat - UNIX-CONNECT:/run/reverse-proxy/admin.sock
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```
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### Changing rate limits
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Update `[rate_limit]` in config and reload (no restart needed).
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### Changing bind address or TLS config
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These are in StaticConfig — require a full process restart.
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### Adding per-site timeouts
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Set `upstream_connect_timeout_secs` and `upstream_request_timeout_secs` on a
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site definition. Defaults are 5s connect, 60s request.
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219
LICENSE
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LICENSE
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Dual Licensing: MIT OR Apache-2.0
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You may use this software under either of the following licenses:
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=== MIT License ===
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MIT License
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Copyright (c) 2026 alkdev
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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|
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
|
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furnished to do so, subject to the following conditions:
|
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||||||
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The above copyright notice and this permission notice shall be included in all
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||||||
|
copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||||
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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=== Apache License, Version 2.0 ===
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Apache License
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||||||
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Version 2.0, January 2004
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http://www.apache.org/licenses/
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TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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1. Definitions.
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"License" shall mean the terms and conditions for use, reproduction,
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||||||
|
9. Accepting Warranty or Additional Liability. While redistributing
|
||||||
|
the Work or Derivative Works thereof, You may choose to offer,
|
||||||
|
and charge a fee for, acceptance of support, warranty, indemnity,
|
||||||
|
or other liability obligations and/or rights consistent with this
|
||||||
|
License. However, in accepting such obligations, You may act only
|
||||||
|
on Your own behalf and on Your sole responsibility, not on behalf
|
||||||
|
of any other Contributor, and only if You agree to indemnify,
|
||||||
|
defend, and hold each Contributor harmless for any liability
|
||||||
|
incurred by, or claims asserted against, such Contributor by reason
|
||||||
|
of your accepting any such warranty or additional liability.
|
||||||
|
|
||||||
|
END OF TERMS AND CONDITIONS
|
||||||
|
|
||||||
|
Copyright 2026 alkdev
|
||||||
|
|
||||||
|
Licensed under the Apache License, Version 2.0 (the "License");
|
||||||
|
you may not use this file except in compliance with the License.
|
||||||
|
You may obtain a copy of the License at
|
||||||
|
|
||||||
|
http://www.apache.org/licenses/LICENSE-2.0
|
||||||
|
|
||||||
|
Unless required by applicable law or agreed to in writing, software
|
||||||
|
distributed under the License is distributed on an "AS IS" BASIS,
|
||||||
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||||
|
See the License for the specific language governing permissions and
|
||||||
|
limitations under the License.
|
||||||
414
README.md
Normal file
414
README.md
Normal file
@@ -0,0 +1,414 @@
|
|||||||
|
# reverse-proxy
|
||||||
|
|
||||||
|
A memory-safe reverse proxy built with Rust and axum, designed to replace
|
||||||
|
vulnerable nginx installations for TLS-terminated host-based routing.
|
||||||
|
|
||||||
|
## Why
|
||||||
|
|
||||||
|
nginx's C codebase has a long history of memory corruption vulnerabilities, and
|
||||||
|
the discovery rate is accelerating. CVE-2026-42945 ("NGINX Rift") is an
|
||||||
|
unauthenticated RCE via the `rewrite` module with a public PoC and active
|
||||||
|
exploitation — and 6 of 7 recent nginx CVEs are memory corruption bugs that
|
||||||
|
Rust eliminates by construction.
|
||||||
|
|
||||||
|
This proxy targets a specific use case: TLS termination, host-based routing,
|
||||||
|
and request forwarding to upstream services. It is not a general-purpose web
|
||||||
|
server or load balancer.
|
||||||
|
|
||||||
|
## Features
|
||||||
|
|
||||||
|
- **TLS termination** — ACME (Let's Encrypt) with automatic provisioning and
|
||||||
|
renewal, or manual certificates
|
||||||
|
- **HTTP/2** — ALPN-based protocol detection on the client-facing side; upstream
|
||||||
|
connections use HTTP/1.1
|
||||||
|
- **Multi-site routing** — host-based routing to multiple upstream services from
|
||||||
|
a single process
|
||||||
|
- **Multiple listeners** — dedicated-IP (one IP per domain) or shared-IP
|
||||||
|
(SAN certificate) deployment models
|
||||||
|
- **Rate limiting** — per-IP token bucket with fail2ban-compatible structured
|
||||||
|
logging (IPv6 rate limited per /64 prefix)
|
||||||
|
- **Proxy headers** — X-Real-IP, X-Forwarded-For (edge proxy model), X-Forwarded-Proto
|
||||||
|
- **Hot config reload** — SIGHUP or admin Unix domain socket with success/failure
|
||||||
|
feedback
|
||||||
|
- **Health check** — localhost-only endpoint on a separate port (default: 9900)
|
||||||
|
- **HTTP → HTTPS redirect** — per-listener redirect on port 80
|
||||||
|
- **Graceful shutdown** — SIGTERM with in-flight request drain
|
||||||
|
- **systemd integration** — `Type=notify` with `sd_notify`
|
||||||
|
- **Container-ready** — Docker deployment with health check and fail2ban volume
|
||||||
|
mount
|
||||||
|
- **Restricted cipher suites** — ECDHE-AES-GCM for TLS 1.2, all TLS 1.3 suites
|
||||||
|
(matching nginx scope)
|
||||||
|
|
||||||
|
## Quick Start
|
||||||
|
|
||||||
|
### Build
|
||||||
|
|
||||||
|
```bash
|
||||||
|
cargo build --release
|
||||||
|
```
|
||||||
|
|
||||||
|
Produces a static binary at `target/release/reverse-proxy`. For a fully static
|
||||||
|
binary (no libc dependency), build with the `x86_64-unknown-linux-musl` target.
|
||||||
|
|
||||||
|
### Minimal Config
|
||||||
|
|
||||||
|
Create `/etc/reverse-proxy/config.toml`:
|
||||||
|
|
||||||
|
```toml
|
||||||
|
health_check_port = 9900
|
||||||
|
|
||||||
|
[logging]
|
||||||
|
level = "info"
|
||||||
|
format = "text"
|
||||||
|
|
||||||
|
[rate_limit]
|
||||||
|
requests_per_second = 10
|
||||||
|
burst = 20
|
||||||
|
|
||||||
|
[body]
|
||||||
|
limit_bytes = 104857600
|
||||||
|
|
||||||
|
[[listeners]]
|
||||||
|
bind_addr = "0.0.0.0"
|
||||||
|
|
||||||
|
[listeners.tls]
|
||||||
|
mode = "acme"
|
||||||
|
acme_domains = ["example.com"]
|
||||||
|
acme_cache_dir = "/var/lib/reverse-proxy/acme-cache"
|
||||||
|
acme_directory = "staging"
|
||||||
|
acme_contact = "mailto:admin@example.com"
|
||||||
|
|
||||||
|
[[listeners.sites]]
|
||||||
|
host = "example.com"
|
||||||
|
upstream = "127.0.0.1:8080"
|
||||||
|
```
|
||||||
|
|
||||||
|
> **Note:** `bind_addr = "0.0.0.0"` requires the `--allow-wildcard-bind` flag or
|
||||||
|
> `allow_wildcard_bind = true` in config. This is intentional — see
|
||||||
|
> [Explicit bind address](#explicit-bind-address).
|
||||||
|
|
||||||
|
### Run
|
||||||
|
|
||||||
|
```bash
|
||||||
|
reverse-proxy --config /etc/reverse-proxy/config.toml
|
||||||
|
```
|
||||||
|
|
||||||
|
Or with Docker (see [Deployment](#deployment)).
|
||||||
|
|
||||||
|
### Validate Config
|
||||||
|
|
||||||
|
```bash
|
||||||
|
reverse-proxy --config /etc/reverse-proxy/config.toml --validate
|
||||||
|
```
|
||||||
|
|
||||||
|
## Configuration
|
||||||
|
|
||||||
|
Configuration uses TOML and is split into **static** (requires restart) and
|
||||||
|
**dynamic** (hot-reloadable) sections.
|
||||||
|
|
||||||
|
### Static Config (requires restart)
|
||||||
|
|
||||||
|
| Field | Default | Description |
|
||||||
|
|-------|---------|-------------|
|
||||||
|
| `listeners` | (required) | TLS listener definitions |
|
||||||
|
| `allow_wildcard_bind` | `false` | Allow `0.0.0.0` bind addresses |
|
||||||
|
| `health_check_port` | `9900` | Local health check port (`0` to disable) |
|
||||||
|
| `admin_socket_path` | `/run/reverse-proxy/admin.sock` | Admin Unix socket (empty string to disable) |
|
||||||
|
| `shutdown_timeout_secs` | `30` | Graceful shutdown timeout |
|
||||||
|
| `logging.level` | `"info"` | Log level |
|
||||||
|
| `logging.format` | `"text"` | Log format (`"text"` or `"json"`) |
|
||||||
|
| `logging.log_file_path` | (not set) | Path to log file for fail2ban |
|
||||||
|
|
||||||
|
### Dynamic Config (hot-reloadable via SIGHUP or admin socket)
|
||||||
|
|
||||||
|
| Field | Default | Description |
|
||||||
|
|-------|---------|-------------|
|
||||||
|
| `sites[].host` | (required) | Hostname to match |
|
||||||
|
| `sites[].upstream` | (required) | Upstream `host:port` address |
|
||||||
|
| `sites[].upstream_scheme` | `"http"` | Upstream protocol (`"http"` or `"https"`) |
|
||||||
|
| `sites[].upstream_connect_timeout_secs` | `5` | TCP connect timeout |
|
||||||
|
| `sites[].upstream_request_timeout_secs` | `60` | Full request timeout |
|
||||||
|
| `rate_limit.requests_per_second` | (required) | Per-IP request rate |
|
||||||
|
| `rate_limit.burst` | (required) | Burst capacity |
|
||||||
|
| `body.limit_bytes` | (required) | Max request body size |
|
||||||
|
|
||||||
|
### TLS Modes
|
||||||
|
|
||||||
|
**ACME** (automatic Let's Encrypt certificates):
|
||||||
|
|
||||||
|
```toml
|
||||||
|
[[listeners]]
|
||||||
|
bind_addr = "203.0.113.10"
|
||||||
|
|
||||||
|
[listeners.tls]
|
||||||
|
mode = "acme"
|
||||||
|
acme_domains = ["git.example.com", "example.com"]
|
||||||
|
acme_cache_dir = "/var/lib/reverse-proxy/acme-cache"
|
||||||
|
acme_directory = "production"
|
||||||
|
acme_contact = "mailto:admin@example.com"
|
||||||
|
|
||||||
|
[[listeners.sites]]
|
||||||
|
host = "git.example.com"
|
||||||
|
upstream = "gitea:3000"
|
||||||
|
|
||||||
|
[[listeners.sites]]
|
||||||
|
host = "example.com"
|
||||||
|
upstream = "app:8080"
|
||||||
|
```
|
||||||
|
|
||||||
|
**Manual** (bring your own certificates):
|
||||||
|
|
||||||
|
```toml
|
||||||
|
[[listeners]]
|
||||||
|
bind_addr = "203.0.113.11"
|
||||||
|
|
||||||
|
[listeners.tls]
|
||||||
|
mode = "manual"
|
||||||
|
cert_path = "/etc/ssl/example.com/fullchain.pem"
|
||||||
|
key_path = "/etc/ssl/example.com/privkey.pem"
|
||||||
|
|
||||||
|
[[listeners.sites]]
|
||||||
|
host = "example.com"
|
||||||
|
upstream = "127.0.0.1:8080"
|
||||||
|
```
|
||||||
|
|
||||||
|
### Explicit Bind Address
|
||||||
|
|
||||||
|
By default, `bind_addr` must be an explicit IP address. `0.0.0.0` is rejected
|
||||||
|
to prevent accidental exposure. For container deployments where the proxy binds
|
||||||
|
inside the container and Docker handles port publishing, enable wildcard binding
|
||||||
|
with either:
|
||||||
|
|
||||||
|
- Config: `allow_wildcard_bind = true`
|
||||||
|
- CLI: `--allow-wildcard-bind`
|
||||||
|
|
||||||
|
Either source enables it (OR logic, not AND).
|
||||||
|
|
||||||
|
## Deployment
|
||||||
|
|
||||||
|
### Docker
|
||||||
|
|
||||||
|
```yaml
|
||||||
|
services:
|
||||||
|
reverse-proxy:
|
||||||
|
build: .
|
||||||
|
container_name: reverse-proxy
|
||||||
|
restart: unless-stopped
|
||||||
|
ports:
|
||||||
|
- "203.0.113.10:80:80"
|
||||||
|
- "203.0.113.10:443:443"
|
||||||
|
volumes:
|
||||||
|
- /etc/reverse-proxy/config.toml:/etc/reverse-proxy/config.toml:ro
|
||||||
|
- /var/lib/reverse-proxy/acme-cache:/var/lib/reverse-proxy/acme-cache
|
||||||
|
- /var/log/reverse-proxy:/var/log/reverse-proxy
|
||||||
|
- /run/reverse-proxy:/run/reverse-proxy
|
||||||
|
networks:
|
||||||
|
- proxy-net
|
||||||
|
healthcheck:
|
||||||
|
test: ["CMD", "wget", "-q", "--spider", "http://127.0.0.1:9900/health"]
|
||||||
|
interval: 30s
|
||||||
|
timeout: 5s
|
||||||
|
retries: 3
|
||||||
|
```
|
||||||
|
|
||||||
|
Container config must set `allow_wildcard_bind = true` and bind to `0.0.0.0`.
|
||||||
|
|
||||||
|
See [`deploy/docker-compose.yml`](deploy/docker-compose.yml) for a complete
|
||||||
|
example including Gitea and PostgreSQL.
|
||||||
|
|
||||||
|
### systemd
|
||||||
|
|
||||||
|
Install the binary and service file:
|
||||||
|
|
||||||
|
```bash
|
||||||
|
cp target/release/reverse-proxy /usr/local/bin/
|
||||||
|
cp deploy/reverse-proxy.service /etc/systemd/system/
|
||||||
|
```
|
||||||
|
|
||||||
|
Create config at `/etc/reverse-proxy/config.toml`, then:
|
||||||
|
|
||||||
|
```bash
|
||||||
|
systemctl enable --now reverse-proxy
|
||||||
|
```
|
||||||
|
|
||||||
|
See [`deploy/reverse-proxy.service`](deploy/reverse-proxy.service) for the
|
||||||
|
unit file with security hardening options.
|
||||||
|
|
||||||
|
### fail2ban
|
||||||
|
|
||||||
|
Install the filter and jail config:
|
||||||
|
|
||||||
|
```bash
|
||||||
|
cp deploy/fail2ban/filter.d/reverse-proxy.conf /etc/fail2ban/filter.d/
|
||||||
|
cp deploy/fail2ban/jail.d/reverse-proxy.conf /etc/fail2ban/jail.d/
|
||||||
|
systemctl restart fail2ban
|
||||||
|
```
|
||||||
|
|
||||||
|
The filter matches `RATE_LIMIT` log lines from the proxy's structured log
|
||||||
|
output. The jail bans IPs after 10 rate-limited requests within 60 seconds
|
||||||
|
(adjust `maxretry` and `findtime` to taste).
|
||||||
|
|
||||||
|
Rate-limited requests produce log lines like:
|
||||||
|
|
||||||
|
```
|
||||||
|
RATE_LIMIT client_ip=203.0.113.50 host=git.example.com path=/login status=429
|
||||||
|
```
|
||||||
|
|
||||||
|
For Docker deployments, mount the log directory so fail2ban on the host can
|
||||||
|
read it:
|
||||||
|
|
||||||
|
```yaml
|
||||||
|
volumes:
|
||||||
|
- /var/log/reverse-proxy:/var/log/reverse-proxy
|
||||||
|
```
|
||||||
|
|
||||||
|
Enable file logging in config:
|
||||||
|
|
||||||
|
```toml
|
||||||
|
[logging]
|
||||||
|
log_file_path = "/var/log/reverse-proxy/access.log"
|
||||||
|
```
|
||||||
|
|
||||||
|
## Admin Socket
|
||||||
|
|
||||||
|
The admin Unix domain socket supports two commands:
|
||||||
|
|
||||||
|
```bash
|
||||||
|
# Reload config
|
||||||
|
echo "reload" | socat - UNIX-CONNECT:/run/reverse-proxy/admin.sock
|
||||||
|
|
||||||
|
# Check status
|
||||||
|
echo "status" | socat - UNIX-CONNECT:/run/reverse-proxy/admin.sock
|
||||||
|
```
|
||||||
|
|
||||||
|
Responses are newline-terminated JSON:
|
||||||
|
|
||||||
|
```json
|
||||||
|
{"status":"ok"}
|
||||||
|
{"status":"ok","uptime_secs":1234,"sites":2}
|
||||||
|
{"status":"error","message":"config validation failed: ..."}
|
||||||
|
```
|
||||||
|
|
||||||
|
Config can also be reloaded with `kill -SIGHUP $(pidof reverse-proxy)`, but
|
||||||
|
SIGHUP provides no feedback on success or failure.
|
||||||
|
|
||||||
|
## Health Check
|
||||||
|
|
||||||
|
```bash
|
||||||
|
curl http://127.0.0.1:9900/health
|
||||||
|
```
|
||||||
|
|
||||||
|
Returns `200 OK` with an empty body. Bound to localhost only — not exposed on
|
||||||
|
public ports.
|
||||||
|
|
||||||
|
## Architecture
|
||||||
|
|
||||||
|
```
|
||||||
|
┌────────────────────────────────────┐
|
||||||
|
│ reverse-proxy (Rust/axum) │
|
||||||
|
config.toml ──────► │ StaticConfig + DynamicConfig │
|
||||||
|
│ (ArcSwap for hot-reload) │
|
||||||
|
│ │
|
||||||
|
│ ┌─ Listener 1 ─────────────────┐ │
|
||||||
|
bind_addr:80 ───► │ │ HTTP → 301 redirect │ │
|
||||||
|
│ └────────────────────────────────┘ │
|
||||||
|
│ │
|
||||||
|
bind_addr:443 ───► │ │ TLS listener (tokio-rustls) │ │
|
||||||
|
│ │ ├─ ACME or Manual TLS config │ │
|
||||||
|
│ │ └─ axum router (per-listener) │ │
|
||||||
|
│ │ ├─ Host → global site lookup │ │
|
||||||
|
│ │ ├─ Rate limiting, headers │ │
|
||||||
|
│ │ └─ Proxy to upstream │ │
|
||||||
|
│ └────────────────────────────────┘ │
|
||||||
|
│ │
|
||||||
|
│ /health → 200 OK (port 9900) │
|
||||||
|
│ Admin socket (Unix domain) │
|
||||||
|
└────────────────────────────────────┘
|
||||||
|
```
|
||||||
|
|
||||||
|
For full architecture documentation, see [`docs/architecture/`](docs/architecture/).
|
||||||
|
|
||||||
|
## Project Structure
|
||||||
|
|
||||||
|
```
|
||||||
|
src/
|
||||||
|
├── main.rs # Entry point, server startup
|
||||||
|
├── cli.rs # CLI argument parsing
|
||||||
|
├── lib.rs # Library root
|
||||||
|
├── config/
|
||||||
|
│ ├── static_config.rs # Immutable startup configuration
|
||||||
|
│ ├── dynamic_config.rs# Hot-reloadable runtime configuration
|
||||||
|
│ └── validation.rs # Config validation rules
|
||||||
|
├── proxy/
|
||||||
|
│ ├── handler.rs # Core reverse proxy handler
|
||||||
|
│ ├── headers.rs # Proxy header injection
|
||||||
|
│ ├── body_limit.rs # Request body size limiting
|
||||||
|
│ └── error.rs # Error response types
|
||||||
|
├── tls/
|
||||||
|
│ ├── acceptor.rs # TLS acceptor setup
|
||||||
|
│ ├── acme.rs # ACME certificate provisioning
|
||||||
|
│ ├── config.rs # TLS configuration
|
||||||
|
│ └── redirect.rs # HTTP → HTTPS redirect
|
||||||
|
├── rate_limit/
|
||||||
|
│ ├── mod.rs # Rate limiting middleware
|
||||||
|
│ └── bucket.rs # Token bucket implementation
|
||||||
|
├── admin/
|
||||||
|
│ ├── socket.rs # Unix domain socket admin API
|
||||||
|
│ └── mod.rs
|
||||||
|
├── health.rs # Health check endpoint
|
||||||
|
├── logging/
|
||||||
|
│ ├── mod.rs # Logging initialization
|
||||||
|
│ └── format.rs # Structured log formatting
|
||||||
|
├── server.rs # HTTPS listener serving
|
||||||
|
├── shutdown.rs # Graceful shutdown handling
|
||||||
|
└── utils.rs # Shared utilities
|
||||||
|
|
||||||
|
deploy/
|
||||||
|
├── Dockerfile
|
||||||
|
├── docker-compose.yml
|
||||||
|
├── reverse-proxy.service
|
||||||
|
└── fail2ban/
|
||||||
|
├── filter.d/reverse-proxy.conf
|
||||||
|
└── jail.d/reverse-proxy.conf
|
||||||
|
|
||||||
|
docs/
|
||||||
|
├── architecture/ # Full architecture documentation
|
||||||
|
│ ├── overview.md
|
||||||
|
│ ├── proxy.md
|
||||||
|
│ ├── tls.md
|
||||||
|
│ ├── config.md
|
||||||
|
│ ├── operations.md
|
||||||
|
│ └── decisions/ # Architecture Decision Records (ADRs)
|
||||||
|
└── research/
|
||||||
|
└── threat-landscape.md
|
||||||
|
```
|
||||||
|
|
||||||
|
## Why Rust
|
||||||
|
|
||||||
|
6 of 7 recent nginx CVEs are memory corruption bugs (buffer overflows,
|
||||||
|
use-after-free, out-of-bounds reads) — the exact class of bugs Rust eliminates
|
||||||
|
by construction. Combined with rustls (pure Rust TLS, no OpenSSL dependency),
|
||||||
|
this proxy provides a fundamentally safer baseline than nginx.
|
||||||
|
|
||||||
|
Rust does not eliminate logic bugs. Rate limiting, header injection prevention,
|
||||||
|
and access control still require careful implementation. But it eliminates the
|
||||||
|
entire category of vulnerabilities that make nginx's C codebase a persistent
|
||||||
|
attack surface.
|
||||||
|
|
||||||
|
See [`docs/research/threat-landscape.md`](docs/research/threat-landscape.md)
|
||||||
|
for the full vulnerability analysis that motivated this project.
|
||||||
|
|
||||||
|
## License
|
||||||
|
|
||||||
|
Licensed under either of
|
||||||
|
|
||||||
|
- Apache License, Version 2.0
|
||||||
|
([http://www.apache.org/licenses/LICENSE-2.0](http://www.apache.org/licenses/LICENSE-2.0))
|
||||||
|
- MIT License
|
||||||
|
([http://opensource.org/licenses/MIT](http://opensource.org/licenses/MIT))
|
||||||
|
|
||||||
|
at your option.
|
||||||
|
|
||||||
|
Unless you explicitly state otherwise, any contribution intentionally submitted
|
||||||
|
for inclusion in this project by you, as defined in the Apache-2.0 license, shall
|
||||||
|
be dual licensed as above, without any additional terms or conditions.
|
||||||
305
deploy/README.md
Normal file
305
deploy/README.md
Normal file
@@ -0,0 +1,305 @@
|
|||||||
|
# Deployment
|
||||||
|
|
||||||
|
Step-by-step setup guides for running reverse-proxy.
|
||||||
|
|
||||||
|
## Docker Deployment (Recommended)
|
||||||
|
|
||||||
|
This is the easiest way to get started and provides container-level isolation
|
||||||
|
as a defense-in-depth measure.
|
||||||
|
|
||||||
|
### 1. Build the image
|
||||||
|
|
||||||
|
```bash
|
||||||
|
cd /path/to/reverse-proxy
|
||||||
|
docker build -t reverse-proxy .
|
||||||
|
```
|
||||||
|
|
||||||
|
### 2. Create directories on the host
|
||||||
|
|
||||||
|
```bash
|
||||||
|
sudo mkdir -p /etc/reverse-proxy
|
||||||
|
sudo mkdir -p /var/lib/reverse-proxy/acme-cache
|
||||||
|
sudo mkdir -p /var/log/reverse-proxy
|
||||||
|
sudo mkdir -p /run/reverse-proxy
|
||||||
|
```
|
||||||
|
|
||||||
|
### 3. Create the config file
|
||||||
|
|
||||||
|
Create `/etc/reverse-proxy/config.toml`. For a basic single-domain setup with
|
||||||
|
Let's Encrypt:
|
||||||
|
|
||||||
|
```toml
|
||||||
|
allow_wildcard_bind = true
|
||||||
|
health_check_port = 9900
|
||||||
|
|
||||||
|
[logging]
|
||||||
|
level = "info"
|
||||||
|
format = "text"
|
||||||
|
log_file_path = "/var/log/reverse-proxy/access.log"
|
||||||
|
|
||||||
|
[rate_limit]
|
||||||
|
requests_per_second = 10
|
||||||
|
burst = 20
|
||||||
|
|
||||||
|
[body]
|
||||||
|
limit_bytes = 104857600
|
||||||
|
|
||||||
|
[[listeners]]
|
||||||
|
bind_addr = "0.0.0.0"
|
||||||
|
http_port = 80
|
||||||
|
https_port = 443
|
||||||
|
|
||||||
|
[listeners.tls]
|
||||||
|
mode = "acme"
|
||||||
|
acme_domains = ["yourdomain.example.com"]
|
||||||
|
acme_cache_dir = "/var/lib/reverse-proxy/acme-cache"
|
||||||
|
acme_directory = "production"
|
||||||
|
acme_contact = "mailto:admin@yourdomain.example.com"
|
||||||
|
|
||||||
|
[[listeners.sites]]
|
||||||
|
host = "yourdomain.example.com"
|
||||||
|
upstream = "your-backend:8080"
|
||||||
|
```
|
||||||
|
|
||||||
|
**Important:** Replace `yourdomain.example.com` with your actual domain and
|
||||||
|
`your-backend:8080` with your upstream service address. For initial testing,
|
||||||
|
use `acme_directory = "staging"` to avoid Let's Encrypt rate limits.
|
||||||
|
|
||||||
|
### 4. Set up Docker Compose
|
||||||
|
|
||||||
|
Copy and customize `docker-compose.yml`:
|
||||||
|
|
||||||
|
```bash
|
||||||
|
cp deploy/docker-compose.yml /opt/reverse-proxy/docker-compose.yml
|
||||||
|
```
|
||||||
|
|
||||||
|
Edit the compose file to:
|
||||||
|
- Replace `203.0.113.10` with your server's public IP
|
||||||
|
- Update upstream service definitions to match your infrastructure
|
||||||
|
- Adjust the `DB_PASSWORD` environment variable (use Docker secrets or `.env`
|
||||||
|
file, never commit real passwords)
|
||||||
|
|
||||||
|
### 5. Start the proxy
|
||||||
|
|
||||||
|
```bash
|
||||||
|
cd /opt/reverse-proxy
|
||||||
|
docker compose up -d
|
||||||
|
```
|
||||||
|
|
||||||
|
### 6. Verify
|
||||||
|
|
||||||
|
```bash
|
||||||
|
# Check container health
|
||||||
|
docker compose ps
|
||||||
|
|
||||||
|
# Test health endpoint (from the host)
|
||||||
|
curl -s http://127.0.0.1:9900/health
|
||||||
|
|
||||||
|
# Check logs
|
||||||
|
docker compose logs reverse-proxy
|
||||||
|
|
||||||
|
# Test TLS
|
||||||
|
curl -v https://yourdomain.example.com/
|
||||||
|
```
|
||||||
|
|
||||||
|
### 7. Set up fail2ban
|
||||||
|
|
||||||
|
If you want automated IP banning for rate limit violations:
|
||||||
|
|
||||||
|
```bash
|
||||||
|
sudo cp deploy/fail2ban/filter.d/reverse-proxy.conf /etc/fail2ban/filter.d/
|
||||||
|
sudo cp deploy/fail2ban/jail.d/reverse-proxy.conf /etc/fail2ban/jail.d/
|
||||||
|
sudo systemctl restart fail2ban
|
||||||
|
```
|
||||||
|
|
||||||
|
Verify fail2ban is watching the logs:
|
||||||
|
|
||||||
|
```bash
|
||||||
|
sudo fail2ban-client status reverse-proxy
|
||||||
|
```
|
||||||
|
|
||||||
|
## Bare Metal / systemd Deployment
|
||||||
|
|
||||||
|
For running directly on a host without Docker.
|
||||||
|
|
||||||
|
### 1. Build
|
||||||
|
|
||||||
|
```bash
|
||||||
|
cargo build --release
|
||||||
|
# For a fully static binary (no libc dependency):
|
||||||
|
# cargo build --release --target x86_64-unknown-linux-musl
|
||||||
|
```
|
||||||
|
|
||||||
|
### 2. Install
|
||||||
|
|
||||||
|
```bash
|
||||||
|
sudo cp target/release/reverse-proxy /usr/local/bin/
|
||||||
|
sudo cp deploy/reverse-proxy.service /etc/systemd/system/
|
||||||
|
```
|
||||||
|
|
||||||
|
### 3. Create config and directories
|
||||||
|
|
||||||
|
```bash
|
||||||
|
sudo mkdir -p /etc/reverse-proxy
|
||||||
|
sudo mkdir -p /var/lib/reverse-proxy/acme-cache
|
||||||
|
sudo mkdir -p /var/log/reverse-proxy
|
||||||
|
sudo mkdir -p /run/reverse-proxy
|
||||||
|
```
|
||||||
|
|
||||||
|
Create `/etc/reverse-proxy/config.toml` (see example configs in the main
|
||||||
|
README). With a bare metal deployment, use the server's actual IP as
|
||||||
|
`bind_addr` instead of `0.0.0.0`:
|
||||||
|
|
||||||
|
```toml
|
||||||
|
# Single-domain bare metal example
|
||||||
|
health_check_port = 9900
|
||||||
|
|
||||||
|
[logging]
|
||||||
|
level = "info"
|
||||||
|
format = "text"
|
||||||
|
log_file_path = "/var/log/reverse-proxy/access.log"
|
||||||
|
|
||||||
|
[rate_limit]
|
||||||
|
requests_per_second = 10
|
||||||
|
burst = 20
|
||||||
|
|
||||||
|
[body]
|
||||||
|
limit_bytes = 104857600
|
||||||
|
|
||||||
|
[[listeners]]
|
||||||
|
bind_addr = "203.0.113.10"
|
||||||
|
http_port = 80
|
||||||
|
https_port = 443
|
||||||
|
|
||||||
|
[listeners.tls]
|
||||||
|
mode = "acme"
|
||||||
|
acme_domains = ["yourdomain.example.com"]
|
||||||
|
acme_cache_dir = "/var/lib/reverse-proxy/acme-cache"
|
||||||
|
acme_directory = "production"
|
||||||
|
acme_contact = "mailto:admin@yourdomain.example.com"
|
||||||
|
|
||||||
|
[[listeners.sites]]
|
||||||
|
host = "yourdomain.example.com"
|
||||||
|
upstream = "127.0.0.1:3000"
|
||||||
|
```
|
||||||
|
|
||||||
|
### 4. Start
|
||||||
|
|
||||||
|
```bash
|
||||||
|
sudo systemctl daemon-reload
|
||||||
|
sudo systemctl enable --now reverse-proxy
|
||||||
|
```
|
||||||
|
|
||||||
|
### 5. Verify
|
||||||
|
|
||||||
|
```bash
|
||||||
|
# Check service status
|
||||||
|
systemctl status reverse-proxy
|
||||||
|
|
||||||
|
# Test health endpoint
|
||||||
|
curl -s http://127.0.0.1:9900/health
|
||||||
|
|
||||||
|
# Check logs
|
||||||
|
journalctl -u reverse-proxy -f
|
||||||
|
```
|
||||||
|
|
||||||
|
### 6. Reload config
|
||||||
|
|
||||||
|
```bash
|
||||||
|
# Via SIGHUP (no feedback)
|
||||||
|
sudo kill -SIGHUP $(pidof reverse-proxy)
|
||||||
|
|
||||||
|
# Via admin socket (returns success/failure JSON)
|
||||||
|
echo "reload" | socat - UNIX-CONNECT:/run/reverse-proxy/admin.sock
|
||||||
|
|
||||||
|
# Check status
|
||||||
|
echo "status" | socat - UNIX-CONNECT:/run/reverse-proxy/admin.sock
|
||||||
|
```
|
||||||
|
|
||||||
|
## Multi-Domain Setup
|
||||||
|
|
||||||
|
### Shared IP with SAN certificate
|
||||||
|
|
||||||
|
One IP, one listener, multiple domains on a single Let's Encrypt SAN certificate:
|
||||||
|
|
||||||
|
```toml
|
||||||
|
[[listeners]]
|
||||||
|
bind_addr = "203.0.113.10"
|
||||||
|
|
||||||
|
[listeners.tls]
|
||||||
|
mode = "acme"
|
||||||
|
acme_domains = ["git.example.com", "www.example.com"]
|
||||||
|
acme_cache_dir = "/var/lib/reverse-proxy/acme-cache"
|
||||||
|
acme_directory = "production"
|
||||||
|
acme_contact = "mailto:admin@example.com"
|
||||||
|
|
||||||
|
[[listeners.sites]]
|
||||||
|
host = "git.example.com"
|
||||||
|
upstream = "127.0.0.1:3000"
|
||||||
|
|
||||||
|
[[listeners.sites]]
|
||||||
|
host = "www.example.com"
|
||||||
|
upstream = "127.0.0.1:8080"
|
||||||
|
```
|
||||||
|
|
||||||
|
### Dedicated IP per domain
|
||||||
|
|
||||||
|
Multiple listeners, each with its own IP and certificate:
|
||||||
|
|
||||||
|
```toml
|
||||||
|
[[listeners]]
|
||||||
|
bind_addr = "203.0.113.10"
|
||||||
|
|
||||||
|
[listeners.tls]
|
||||||
|
mode = "acme"
|
||||||
|
acme_domains = ["git.example.com"]
|
||||||
|
acme_cache_dir = "/var/lib/reverse-proxy/acme-cache-git"
|
||||||
|
acme_directory = "production"
|
||||||
|
acme_contact = "mailto:admin@example.com"
|
||||||
|
|
||||||
|
[[listeners.sites]]
|
||||||
|
host = "git.example.com"
|
||||||
|
upstream = "127.0.0.1:3000"
|
||||||
|
|
||||||
|
[[listeners]]
|
||||||
|
bind_addr = "203.0.113.11"
|
||||||
|
|
||||||
|
[listeners.tls]
|
||||||
|
mode = "manual"
|
||||||
|
cert_path = "/etc/ssl/www.example.com/fullchain.pem"
|
||||||
|
key_path = "/etc/ssl/www.example.com/privkey.pem"
|
||||||
|
|
||||||
|
[[listeners.sites]]
|
||||||
|
host = "www.example.com"
|
||||||
|
upstream = "127.0.0.1:8080"
|
||||||
|
```
|
||||||
|
|
||||||
|
## HTTPS Upstream
|
||||||
|
|
||||||
|
If your upstream service uses TLS, set `upstream_scheme = "https"`:
|
||||||
|
|
||||||
|
```toml
|
||||||
|
[[listeners.sites]]
|
||||||
|
host = "secure.example.com"
|
||||||
|
upstream = "10.0.0.5:8443"
|
||||||
|
upstream_scheme = "https"
|
||||||
|
```
|
||||||
|
|
||||||
|
The proxy validates upstream TLS certificates using the system's native
|
||||||
|
certificate store.
|
||||||
|
|
||||||
|
## Security Notes
|
||||||
|
|
||||||
|
- The proxy binds to explicit IP addresses by default. `0.0.0.0` is rejected
|
||||||
|
unless `--allow-wildcard-bind` or `allow_wildcard_bind = true` is set.
|
||||||
|
This prevents accidental exposure on unintended interfaces.
|
||||||
|
- The health check endpoint binds to `127.0.0.1` only and is never exposed on
|
||||||
|
public ports.
|
||||||
|
- The admin socket should be protected by file permissions. It defaults to
|
||||||
|
`/run/reverse-proxy/admin.sock`.
|
||||||
|
- Rate limiting is global per-IP (IPv4: /32, IPv6: /64) in the current
|
||||||
|
version. Per-site rate limits may be added later.
|
||||||
|
- All log output disables ANSI escape codes for fail2ban and container
|
||||||
|
compatibility.
|
||||||
|
- The `Server` header is stripped from upstream responses and not added by the
|
||||||
|
proxy, reducing server fingerprinting.
|
||||||
Reference in New Issue
Block a user