Golang FTP Server

This FTP server is a gateway between old-school FTP devices and modern cloud based file systems, using the afero's Fs interface and acting as a reference implementation of the ftpserverlib.

At the current stage, supported backend are:

Local disk
S3 through afero-s3
Dropbox (see doc) through afero-dropbox
Google Drive (see doc) through afero-gdrive
SFTP through afero's sftpfs
Email through go-mail thanks to @x-way

And with those are supported common parameters to switch them to read-only, enable login access, or use a temporary directory file (see doc).

Current status of the project

Features

FTP protocol

These features are brought by ftpserverlib itself:

Uploading and downloading files
Directory listing (LIST + MLST)
File and directory deletion and renaming
TLS support (AUTH + PROT)
File download/upload resume support (REST)
Complete driver for all the above features
Passive socket connections (EPSV and PASV commands)
Active socket connections (PORT command)
Small memory footprint
Only relies on the standard library except for:
- go-kit log for logging
- afero for generic file systems handling
Supported extensions:
- AUTH - Control session protection
- AUTH TLS - TLS session
- PROT - Transfer protection
- EPRT/EPSV - IPv6 support
- MDTM - File Modification Time
- SIZE - Size of a file
- REST - Restart of interrupted transfer
- MLST - Simple file listing for machine processing
- MLSD - Directory listing for machine processing

Getting started

Get it

Download it

Fetch a binary from the latest release and run it.

Build & run it locally

go install github.com/fclairamb/ftpserver@main

ftpserver &

Run it with docker

There's also a containerized version of the server (31MB, based on alpine).

# Creating a directory
mkdir -p files

# Starting the sample FTP server
docker run --rm -d -p 2121-2130:2121-2130 -v $(pwd)/files:/tmp -v $(pwd):/app fclairamb/ftpserver

Run it with docker compose

# docker-compose.yml

version: '3.3'
services:
  ftpserver:
    ports:
      - '2121-2130:2121-2130'
    volumes:
      - ./files:/tmp
      - .:/app
    image: fclairamb/ftpserver

docker-compose up -d

Test it

This is a quick way to see if it's working correctly:

# Download some file
[ -f kitty.jpg ] || (curl -o kitty.jpg.tmp https://placekitten.com/2048/2048 && mv kitty.jpg.tmp kitty.jpg)

# Upload it to the server
curl -v -T kitty.jpg ftp://test:test@localhost:2121/

# Download it back
curl ftp://test:test@localhost:2121/kitty.jpg -o kitty2.jpg

# Compare it
diff kitty.jpg kitty2.jpg

Config file

If you don't create a ftpserver.json file, one will be created for you.

Here is a sample config file:

{
   "version": 1,
   "passive_transfer_port_range": {
      "start": 2122,
      "end": 2130
   },
   "tls": {
      "server_cert": {
         "cert": "cert.pem",
         "key": "key.pem"
      }
   },
   "accesses": [
      {
         "user": "test",
         "pass": "test",
         "fs": "os",
         "params": {
            "basePath": "/tmp"
         }
      },
      {
         "user": "test",
         "pass": "test",
         "fs": "os",
         "params": {
            "basePath": "/tmp"
         }
      },
      {
         "user": "dropbox",
         "pass": "dropbox",
         "fs": "dropbox",
         "params": {
            "token": "..."
         }
      },
      {
         "user": "gdrive",
         "pass": "gdrive",
         "fs": "gdrive",
         "params": {
            "google_client_id": "***.apps.googleusercontent.com",
            "google_client_secret": "****",
            "base_path": "ftp"
         }
      },
      {

         "user": "s3",
         "pass": "s3",
         "fs": "s3",
         "params": {
            "endpoint": "https://s3.amazonaws.com",
            "region": "eu-west-1",
            "bucket": "my-bucket",
            "access_key_id": "AKIA....",
            "secret_access_key": "IDxd....",
            "disable_ssl": "false",
            "path_style": "false"
         }
      },
      {
         "user": "sftp",
         "pass": "sftp",
         "fs": "sftp",
         "params": {
            "username": "user",
            "password": "password",
            "hostname": "192.168.168.11:22"
         }
      }
   ]
}

You can generate the TLS key pair files with the following command:

openssl req -new -newkey rsa:4096 -x509 -sha256 -days 365 -nodes -out cert.pem -keyout key.pem

infadroidmx/ftpserver