A simple SoftEther VPN server Docker image

Note: OpenVPN support is enabled on :latest image. STDOUT (docker log) format has changed as a result.

Setup

• L2TP/IPSec PSK + OpenVPN
• SecureNAT enabled
• Perfect Forward Secrecy (DHE-RSA-AES256-SHA)
• make'd from the official SoftEther VPN GitHub repo master (Note: they don't have any other branches or tags.)
  • with a local patch to set AES-256-CBC as OpenVPN default cipher.

docker run -d --cap-add NET_ADMIN -p 500:500/udp -p 4500:4500/udp -p 1701:1701/tcp -p 1194:1194/udp -p 5555:5555/tcp siomiz/softethervpn

Connectivity tested on Android + iOS devices. It seems Android devices do not require L2TP server to have port 1701/tcp open.

The above example will accept connections from both L2TP/IPSec and OpenVPN clients at the same time.

Mix and match published ports:

• -p 500:500/udp -p 4500:4500/udp -p 1701:1701/tcp for L2TP/IPSec
• -p 1194:1194/udp for OpenVPN.
• -p 443:443/tcp for OpenVPN over HTTPS.
• -p 5555:5555/tcp for SoftEther VPN (recommended by vendor).
• -p 992:992/tcp is also available as alternative.

Any protocol supported by SoftEther VPN server is accepted at any open/published port (if VPN client allows non-default ports).

Credentials

All optional:

• -e PSK: Pre-Shared Key (PSK), if not set: "notasecret" (without quotes) by default.
• -e USERS: Multiple usernames and passwords may be set with the following pattern: username:password;user2:pass2;user3:pass3. Username and passwords are separated by :. Each pair of username:password should be separated by ;. If not set a single user account with a random username ("user[nnnn]") and a random weak password is created.
• -e SPW: Server management password. ⚠️
• -e HPW: "DEFAULT" hub management password. ⚠️

Single-user mode (usage of -e USERNAME and -e PASSWORD) is still supported.

See the docker log for username and password (unless -e USERS is set), which would look like:

# ========================
# user6301
# 2329.2890.3101.2451.9875
# ========================

Dots (.) are part of the password. Password will not be logged if specified via -e USERS; use docker inspect in case you need to see it.

⚠️ if not set a random password will be set but not displayed nor logged. If specifying read the notice below.

Notice

If you specify credentials using environment variables (-e), they may be revealed via the process list on host (ex. ps(1) command) or docker inspect command. It is recommended to mount an already-configured SoftEther VPN config file at /opt/vpn_server.config, which contains hashed passwords rather than raw ones. The initial setup will be skipped if this file exists at runtime (in entrypoint script). You can obtain this file from a running container using docker cp command.

OpenVPN

docker run -d --cap-add NET_ADMIN -p 1194:1194/udp siomiz/softethervpn

The entire log can be saved and used as an .ovpn config file (change as needed).

Server CA certificate will be created automatically at runtime if it's not set. You can supply a self-signed 1024-bit RSA certificate/key pair created locally OR use the gencert script described below. Feed the keypair contents via -e CERT and -e KEY (use of --env-file is recommended). X.509 markers (like -----BEGIN CERTIFICATE-----) and any non-BASE64 character (incl. newline) can be omitted and will be ignored.

Examples (assuming bash; note the double-quotes " and backticks `):

• -e CERT="`cat server.crt`" -e KEY="`cat server.key`"
• -e CERT="MIIDp..b9xA=" -e KEY="MIIEv..x/A=="
• --env-file /path/to/envlist

env-file template can be generated by:

docker run --rm siomiz/softethervpn gencert > /path/to/envlist

The output will have CERT and KEY already filled in. Modify PSK/USERS.

Certificate volumes support (like -v or --volumes-from) will be added at some point...

License

MIT License.