Cloudflared Proxy

A flexible reverse proxy for Cloudflare Access applications.

This tool allows you to proxy multiple Cloudflare Access protected applications to your local machine, with easy configuration via command-line flags, a configuration file, or environment variables.

Features

• Multiple Endpoints: Proxy multiple applications simultaneously.
• Flexible Configuration: Use command-line flags, a configuration file (YAML, JSON, etc.), or environment variables.
• TLS Configuration: Option to skip TLS verification for non trusted certificates.

Installation

The binary can be downloaded from the GitHub Releases page.

Alternatively, you can build from source:

go build -o cfproxy .

Usage

The primary command is run, which starts the reverse proxies.

./cfproxy run [flags]

Command-Line Flags

You can specify endpoints directly on the command line.

Endpoint Format: [LOCAL_PORT:]HOSTNAME[:DEST_PORT]

• LOCAL_PORT: (Optional) The port on your local machine (default: 8888).
• HOSTNAME: (Required) The destination hostname.
• DEST_PORT: (Optional) The destination port (default: 443).

Examples:

# Proxy example.com to localhost:8888
./cfproxy run -e example.com

# Proxy example.com to localhost:9000
./cfproxy run -e 9000:example.com

# Proxy example.com:8443 to localhost:8888
./cfproxy run -e example.com:8443

# Proxy example.com:8443 to localhost:9000
./cfproxy run -e 9000:example.com:8443

# Proxy multiple endpoints
./cfproxy run -e example1.com,9001:example2.com
  # or
./cfproxy run -e example1.com -e 9001:example2.com

# Skip TLS verification
./cfproxy run -e example.com --skip-tls

Configuration File

For a more persistent setup, you can use a configuration file. By default, cfproxy looks for a config file in $HOME/.config/cloudflared-proxy/. You can specify a different file with the --config or -c flag.

Example config.yaml:

proxies:
  - hostname: "app1.your-domain.com"
    localPort: 8080
  - hostname: "app2.your-domain.com"
    localPort: 8081
    destinationPort: 8443
  - hostname: "app3.your-domain.com"
    skipTLS: true

With a configuration file, you can start the proxies with a simple command:

./cfproxy run

Or with a custom config file path:

./cfproxy run -c /path/to/your/config.yaml

Configuration Precedence

The tool can be configured using a configuration file or command-line flags. Please note that for defining proxy endpoints, these methods are mutually exclusive.

Configuration is loaded from the following sources:

1. Configuration File:
   • By default, the tool looks for a config.yaml file in $HOME/.config/cloudflared-proxy/.
   • A different configuration file can be specified using the --config or -c flag. If a file is specified with this flag and it is not found, the program will exit with an error.
2. Command-Line Flags:
   • Endpoints can be specified directly using the --endpoints or -e flag.
   • If endpoints are provided via flags, any configuration file will be ignored for endpoint definitions.

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For more details on Cloudflare Tunnels, see the official documentation.