vsftpd

vsftpd is a GPL licensed FTP server for UNIX systems, including Linux. It is secure and extremely fast. It is stable. Don't take my word for it, though.

Directory Tree

~/fig/vsftpd/
├── docker-compose.yml
├── ftp/
│   └── README.md
└── vsftpd/
    ├── vsftpd.conf
    └── vsftpd.pem

vsftpd.conf

allow_writeable_chroot=YES
anonymous_enable=YES
chroot_local_user=YES
connect_from_port_20=YES
dirmessage_enable=YES
force_local_data_ssl=YES
force_local_logins_ssl=YES
ftpd_banner=Welcome to VSFTPD service.
listen=YES
local_enable=YES
pasv_addr_resolve=YES
pasv_address=my-ftp-server
pasv_enable=YES
pasv_max_port=30010
pasv_min_port=30000
port_enable=YES
rsa_cert_file=/etc/vsftpd/vsftpd.pem
rsa_private_key_file=/etc/vsftpd/vsftpd.pem
seccomp_sandbox=NO
ssl_enable=YES
ssl_sslv2=NO
ssl_sslv3=NO
ssl_tlsv1=YES
write_enable=YES
xferlog_enable=YES

Please point pasv_address to your ftp server.

docker-compose.yml

vsftpd:
  image: vimagick/vsftpd
# net: host
  ports:
    - "20:20"
    - "21:21"
    - "30000-30010:30000-30010"
  volumes:
    - ./vsftpd:/etc/vsftpd
    - ./ftp:/var/lib/ftp
  privileged: true
  restart: always

You can use net: host instead of ports. Make sure these ports are allowed by firewall.

Server

$ cd ~/fig/vsftpd/
$ openssl req -x509 -nodes -days 365 -newkey rsa:2048 -keyout vsftpd/vsftpd.pem -out vsftpd/vsftpd.pem
$ docker-compose up -d
$ touch ./ftp/README.md
$ docker exec -it vsftpd_vsftpd_1 sh
>>>
>>> passwd root
Changing password for root
New password: ******
Retype password: ******
Password for root changed by root
>>>
>>> adduser kev
Changing password for kev
New password: ******
Retype password: ******
Password for kev changed by root
>>>
>>> exit

⚠️ Default password for root is empty, please change it! I also added another local user called kev here. You can edit /etc/vsftpd/vsftpd.conf to enable more functions.

Client

You can login as root/kev(local user) or ftp(anonymous user).

$ ftp my-ftp-server
Connected to my-ftp-server.
220 Welcome to VSFTPD service.
Name (my-ftp-server:kev): ftp
331 Please specify the password.
Password: 
230 Login successful.
Remote system type is UNIX.
Using binary mode to transfer files.

ftp> verbose off
Verbose mode off.

ftp> ls
-rw-r--r--    1 0        0               0 Jan 31 15:06 README.md

ftp> get README.md
     0        0.00 KiB/s

ftp> !cat README.md

ftp> put README.md
Permission denied.

ftp> bye

Only local users can upload files.

$ lftp
lftp :~> set ssl:verify-certificate no
lftp :~> open root@my-ftp-server
Password: ******
lftp root@my-ftp-server:~> put README.md
lftp root@my-ftp-server:~> ls
-rw-------    1 0        0             337 Jan 31 16:26 README.md
lftp root@my-ftp-server:~> bye

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