OpenConnect VPN Server with Active Directory authentication

OpenConnect VPN server is an SSL VPN server that is secure, small, fast and configurable. It implements the OpenConnect SSL VPN protocol and has also (currently experimental) compatibility with clients using the AnyConnect SSL VPN protocol. The OpenConnect protocol provides a dual TCP/UDP VPN channel and uses the standard IETF security protocols to secure it. The OpenConnect client is multi-platform and available here. Alternatively, you can try connecting using the official Cisco AnyConnect client (Confirmed working with AnyConnect 4.802045).

Homepage Documentation Source

Docker Features

• Base: Debian Latest
• Latest OpenConnect Server 0.12.2
• LDAP/Active Directory authentication with libpam-ldap
• Size: 167MB
• Customizing the DNS servers used for queries over the VPN
• Supports tunneling all traffic over the VPN or tunneling only specific routes via split-include
• Config directory can be mounted to a host directory for persistence
• Create certs automatically using default or provided values, or drop your own certs in /config/certs

Run container from Docker registry

The container is available from the Docker registry and this is the simplest way to get it. It needs a fair few environment variables, so I suggest using docker-compose.

Quick Start

If you have not already done so, install docker-compose in according with its documentation.

In an empty directory, create a file called docker-compose.yaml and insert the below contents, substituting values suitable for your environment:

version: "3"

services:
  ocserv:
    container_name: ocserv
    image: morganonbass/ocserv-ldap:latest
    ports:
      - "443:443/tcp"
      - "443:443/udp"
    environment:
      LISTEN_PORT: 443
      TUNNEL_MODE: 'split_include'
      TUNNEL_ROUTES: '192.168.1.0/24, 192.168.69.0/24'
      DNS_SERVERS: 192.168.1.1
      SPLIT_DNS_DOMAINS: 'internal.domain.com'
      CLIENTNET: 192.168.248.0
      CLIENTNETMASK: 255.255.255.128
      BASEDN: 'dc=example,dc=com'
      LDAPURI: 'ldap://192.168.1.1/'
      BINDDN: 'CN=ocserv,CN=Users,DC=example,DC=com'
      BINDPW: 'aSuperSecurePassword'
      SEARCHSCOPE: 'sub'
      PAM_LOGIN_ATTRIBUTE: 'userPrincipalName'
      CA_CN: 'VPN CA'
      CA_ORG: 'OCSERV'
      CA_DAYS: 9999 
      SRV_CN: 'vpn.example.com'
      SRV_ORG: 'Example Company'
      SRV_DAYS: 9999
    volumes:
      - './config/:/config/'
    cap_add:
      - NET_ADMIN
    privileged: true
    restart: unless-stopped

Then, start the vpn service like so:

docker-compose up -d

Using your own certificates

On start, the server checks for the following files:

/config/server-key.pem
/config/server-cert.pem

If these do not exist, a self signed certificate will be created. You may of course place your own signed certificates at this location.

Advanced Configuration:

All of the relevant config files are in the /config volume. You may edit them to make use of more of Openconnect's features. Some advanced features include setting up site to site VPN links, User Groups, Proxy Protocol support and more.

Variables

Environment Variables

Variable	Required	Function	Example
LISTEN_PORT	No	Listening port for VPN connections	443
DNS_SERVERS	No	Comma delimited name servers	8.8.8.8,8.8.4.4
TUNNEL_MODE	No	Tunnel mode (all / split-include)	split-include
TUNNEL_ROUTES	No	Comma delimited tunnel routes in CIDR notation	192.168.1.0/24
SPLIT_DNS_DOMAINS	No	Comma delimited dns domains	example.com
CLIENTNET	No	Network from which to assign client IPs	192.168.255.0
CLIENTNETMASK	No	Client subnet mask	255.255.255.0
BASEDN	Yes	Base DN for LDAP Search	dc=example,dc=com
LDAPURI	Yes	URI of LDAP Server	ldap://192.168.1.1
BINDDN	Yes	Account to bind PAM to LDAP	CN=ocserv,CN=Users,DC=example,DC=com
BINDPW	Yes	Password for the bind account	hunter2
SEARCHSCOPE	No	LDAP Search Scope (sub / one / base)	sub
PAM_LOGIN_ATTRIBUTE	No	LDAP Attribute to match - what your user will put in the username field of their client (sAMAccountName / userPrincipalName / uid)	userPrincipalName

Volumes

Volume	Required	Function	Example
config	No	OpenConnect config files	/your/config/path/:/config

Ports

Port	Proto	Required	Function	Example
443	TCP	Yes	OpenConnect server TCP listening port	443:443
443	UDP	Yes	OpenConnect server UDP listening port	443:443/udp

Login and Logout Log Messages

After a user successfully logins to the VPN a message will be logged in the docker log.
Example of login message:

[info] User bob Connected - Server: 192.168.1.165 VPN IP: 192.168.255.194 Remote IP: 107.92.120.188 

Example of logoff message:

[info] User bob Disconnected - Bytes In: 175856 Bytes Out: 4746819 Duration:63

Issues

If you are having issues with this container please submit an issue on GitHub. Please provide logs, docker version and other information that can simplify reproducing the issue. Using the latest stable verison of Docker is always recommended. Support for older version is on a best-effort basis.