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Connect to NordVPN servers secure with Iptables and fast with OpenVPN

Project description

CønNørD

Connect to NordVPN servers secure and fast

Code Style: Black License Python Version GitHub tag (latest SemVer) Travis (.com) branch Coveralls github


CønNørD connects you to NordVPN servers with OpenVPN and you can choose between a high amount of possible filters, to make it easy for you to connect to servers with the best performance and features the server offers to you. It's taken care that your DNS isn't leaked. You can test your DNS spoofability here and DNS leaks here.

Most of the tools out there provide their own set of firewall rules without possibility to customize them to your needs. Sometimes it is just cumbersome to write your own set of rules and make them compatible with the connection tool. CønNørD just provides a reasonable default, but you stay ALWAYS in control of your firewall and can customize every rule to your needs. Furthermore CønNørD exposes a lot of environment variables from OpenVPN and the running connord instance to .rules and .fallback files so you can tailor each rule dynamically to your interfaces, current ip addresses and more. See the Iptables section on how it works or just accept the defaults, which work perfectly fine for unexperienced users, without breaking your privacy and internet experience.

CønNørD keeps configuration files in openvpn folders, so you can always step back to OpenVPN if you like to without the need to search too much around. You may keep CønNørD around then to update your configuration files with a cronjob on a regular basis and enjoy the nice server listings ;) But if you use this tool for connecting you can easily change every option that is set to start the OpenVPN process in a simple yaml configuration file, or just keep them that way if your glad with the defaults. Honestly the defaults should cover most use cases.

Dependencies

  • resolvconf
  • iptables
  • openvpn

Quick start guide

  • Follow Installation instructions below

  • (Optional) Copy everything within your python site-packages/connord/config/ folder to /etc/connord. For example python3.7:

        sudo cp -r /lib/python3.7/site-packages/connord/config /etc/connord
        sudoedit /etc/connord/config.yml
    
  • (Optional) Customize config.yml either in site-packages or /etc/connord if you've taken the optional step above.

  • Depending on your current iptables rules you may need to run $ sudo connord iptables flush.

  • Get the openvpn configuration files for nordvpn with $ sudo connord update. Files are installed in /etc/openvpn/client/nordvpn per default.

  • Execute $ sudo connord connect -c YOUR_COUNTRY_CODE and replace YOUR_COUNTRY_CODE with the ISO_3166-1_alpha-2 country code of your current country. You will be asked for your username and password which are stored under /etc/openvpn/client/nordvpn/credentials with mode 0600.

Installation

First make sure you have all system dependencies installed.

Ubuntu/Debian

$ sudo apt-get install resolvconf iptables openvpn

Arch

$ sudo pacman -Sy openresolv iptables openvpn

Installation of CønNørD

$ pip install --upgrade connord

or globally:

$ sudo pip install --upgrade connord

You may also clone the repo

$ git clone git@github.com:MaelStor/connord.git
$ cd connord

and install in userspace with

$ pip install --user .

or globally with

$ sudo pip install .

General section

CønNørD per default doesn't output anything on stdout and behaves like any other standard command-line tool. If you experience problems running connord, try the same command in verbose mode with

connord -v COMMAND

or

connord --verbose COMMAND

for debugging purposes. You should see in most cases where the error occurred. There may be still hard to track bugs, please report them to the Issue board on Github.

Error messages are written to stderr in your shell. You can suppress error messages with -q or --quiet if you like to.

Verbose mode of openvpn can be set in config.yml in the openvpn section or at the command-line when using connord connect adding it to the openvpn command with -o '--verb 3'.

Obfuscated servers

In order to be able to connect to obfuscated servers you need to patch OpenVPN. For example the repository of Tunnelblick includes the patches in third_party/sources/openvpn. How this can be done is described here. I haven't patched my openvpn client, so I can't share experiences but above solution is reported to work. Please don't post any issues around this topic on the issue board of CønNørD.

You can list obfuscated servers with $ connord list servers -t obfuscated. Same scheme to finally connect to an obfuscated server for example located in HongKong: $ sudo connord connect -c hk -t obfuscated.

You will be warned by connord if you try to connect to an obfuscated server, to prevent accidential connection, what fails if you haven't patched the openvpn client. For example:

$ connord connect -c hk -t obfuscated
WARNING: hk67.nordvpn.com is an obfuscated server.
This may fail if not configured properly.
Are you sure you want to continue? (y/N): y
Options error: Unrecognized option or missing or extra parameter(s) in /tmp/ovpn.conf:24: scramble (2.4.7)
Use --help for more information.
connord: Running openvpn failed: Openvpn process stopped unexpected.

Configuration

Default configuration files are located in your python site-packages/connord/config folder. You may wish to create an more permanent location and copy them to /etc/connord/. The folder needs to be created if not already done. Configuration files in site-packages don't survive an upgrade in contrast to /etc/connord. If the /etc/connord folder exists no configuration files in site-packages are read.

To see which configuration folder is active run connord --verbose version.

config.yml

The main configuration file in YAML format. Every variable set here is exposed to .rules and .fallback templates.

iptables

So you may set something like this

iptables
  dns:
    # NordVPN
    - '103.86.99.100/32'
    - '103.86.96.100/32'

and use it for example in 01-filter.rules:

OUTPUT:
  policy: ACCEPT
  action: None
  rules:
{% for server in iptables.dns %}
  - dst: "{{ server }}"
    protocol: udp
    udp:
      dport: '53'
    target: ACCEPT
{% endfor %}

what creates the following after rendering:

OUTPUT:
  policy: ACCEPT
  action: None
  rules:
  - dst: '103.86.99.100/32'
    protocol: udp
    udp:
      dport: '53'
    target: ACCEPT
  - dst: '103.86.96.100/32'
    protocol: udp
    udp:
      dport: '53'
    target: ACCEPT

Like it? See more examples in the rules and fallback files section.

openvpn

These are the default settings to start OpenVPN:

openvpn:
  daemon: False
  auth-user-pass: "built-in"
  auth-nocache: False
  auth-retry: "nointeract"
  down-pre: True
  redirect-gateway: True
  script-security: 2
  # This section is special to connord and can't be found in the openvpn manual
  scripts:
    - name: "up"
      path: "built-in"
      stage: "up"
      creates: "up.env"
    - name: "down"
      path: "built-in"
      stage: "down"
      creates: "down.env"
    - name: "ipchange"
      path: "built-in"
      stage: "always"
      creates: "ipchange.env"

For an overview of all possible options see $ man openvpn. You just need to strip off the leading '--' and place it somewhere in the openvpn section. Arguments are written after : or if the option doesn't take any arguments place True after :. Most common mistake is to ignore indentation. But since this is a yaml file indentation IS important. Further reading about YAML Syntax. There's the special keyword built-in around what can be applied to:

  • auth-user-pass
  • scripts paths
    • name: up
    • name: down
    • name: ipchange

if you like to use the built-in paths, what is the default behaviour. If you don't like to run a script say when openvpn goes down delete or comment out

    - name: "down"
      path: "built-in"
      stage: "down"
      creates: "down.env"

Iptables

rules and fallback files

These files are jinja2 templates which are rendered with the config.yml file and .env files created by the built-in up, down and ipchange scripts when openvpn starts running.

Naming scheme

The naming scheme is important. Let's take for example the rules file which shall be applied to netfilters filter table. 01-filter.rules. The leading number isn't necessary but you can control the order when to apply the files that way. After the dash - follows the table name. The dash isn't needed when there is no leading number. The suffix .rules causes the rules to be applied after successfully establishing a connection to a server. The suffix .fallback causes the rules to be applied when disconnecting from a server or after invokation of connord iptables flush. If you're writing ipv6 rules for the filter table place them in a file like 01-filter6.rules or 01-filter6.fallback. Files with a 6 suffix are applied to ip6tables.

Variables

Every variable you define or is already defined in config.yml is available in rules and fallback files. In addition to that the connord instance exposes the following variables to .rules and .fallback files:

vpn_remote      # the remote server ip address
vpn_protocol    # the protocol in use: udp or tcp
vpn_port        # may be 1194 (udp) or 443 (tcp)

gateway:
  ip_address    # the ip_address of the default gateway 
  interface     # the interface of the default gateway

lan:            # derived from the default gateway's interface
  inet:         # short for AF_INET
  - addr:       # the ip address of your LAN
    netmask:    # the netmask for your LAN
    broadcast:  # the broadcast address of your ipv4 LAN
  inet6:        # actually derived from AF_INET6
  - addr:       # (mostly one of) the ipv6 addressess
    netmask:    # the netmask for you LAN
  link:         # short for AF_LINK
  - addr:       # the MAC address of your LAN card
    broadcast:  # the broadcast address. Should be in most cases
                  ff:ff:ff:ff:ff:ff

In fallback files vpn_remote is 0.0.0.0/0, vpn_protocol is udp and vpn_port is set to 1194. Be aware that there can be more than one inet or inet6 addresses.

Variables exposed from OpenVPN scripts can be seen when starting connord not in daemon mode. The list given here may be incomplete or too exhaustive for your network and is therfor just an incomplete overview. Look at the output of connord for your environment.

connord 'ipchange' enviroment variables: '/var/run/connord/ipchange.env'
ipchange_args:
  - '[AF_INET]100.100.100.100 1194'
  - '/var/run/connord/ipchange.env'
ip_address: '100.100.100.100'
port_number: '1194'
trusted_ip: '100.100.100.100'
trusted_port: '1194'
untrusted_ip: '100.100.100.100'
untrusted_port: '1194'
connord 'up' enviroment variables: '/var/run/connord/up.env'
up_args:
  - 'init'
  - '255.255.255.0'
  - '10.8.1.10'
  - '1590'
  - '1500'
  - 'tun1'
  - '/var/run/connord/up.env'
dhcp_option:
  dns:
    - '103.86.99.100'
    - '103.86.96.100'
dev: 'tun1'
ifconfig_broadcast: '10.8.1.255'
ifconfig_local: '10.8.1.10'
ifconfig_netmask: '255.255.255.0'
link_mtu: '1590'
route_net_gateway: '200.200.200.200'
route_vpn_gateway: '10.8.1.1'
script_context: 'init'
tun_mtu: '1500'
trusted_ip: '100.100.100.100'
trusted_port: '1194'
untrusted_ip: '100.100.100.100'
untrusted_port: '1194'
connord 'down' enviroment variables: '/var/run/connord/down.env'
down_args:
  - 'init'
  - '255.255.255.0'
  - '10.8.1.10'
  - '1590'
  - '1500'
  - 'tun1'
  - '/var/run/connord/down.env'
dhcp_option:
  dns:
    - '103.86.99.100'
    - '103.86.96.100'
dev: 'tun1'
ifconfig_broadcast: '10.8.1.255'
ifconfig_local: '10.8.1.10'
ifconfig_netmask: '255.255.255.0'
link_mtu: '1590'
route_net_gateway: '200.200.200.200'
route_vpn_gateway: '10.8.1.1'
script_context: 'init'
tun_mtu: '1500'
trusted_ip: '100.100.100.100'
trusted_port: '1194'
untrusted_ip: '100.100.100.100'
untrusted_port: '1194'
redirect_gateway: '1'

Variables from OpenVPN scripts are only available in .rules files!

Overview over the most important command-line options

Command-line options overwrite the configuration in config.yml

Main options

usage: connord [-h] [-q | -v] {update,list,connect,kill,iptables,version} ...

CønNørD connects you to NordVPN servers with OpenVPN (https://openvpn.net) and
you can choose between a high amount of possible filters, to make it easy for
you to connect to servers with the best performance and features the server
offers to you. It's taken care that your DNS isn't leaked.

positional arguments:
  {update,list,connect,kill,iptables,version}
    update              Update nordvpn configuration files and the location
                        database.
    list                List features, types, ... and servers.
    connect             Connect to a server.
    kill                Kill the openvpn process.
    iptables            Manage iptables.
    version             Show version

optional arguments:
  -h, --help            show this help message and exit
  -q, --quiet           Suppress error messages.
  -v, --verbose         Show what's going.

Run a command with -h or --help for more information.

Listings

usage: connord list [-h] {iptables,countries,areas,features,types,servers} ...

The 'list' command allows some powerful filtering so you can select a server
tailored to your demands. 'types', 'features', 'areas', 'countries' give you
an overview output of possible arguments to the respective flag.

positional arguments:
  {iptables,countries,areas,features,types,servers}
    iptables            List rules in netfilter tables. With no arguments list
                        ipv4 'filter' table.
    countries           List all countries with NordVPN servers.
    areas               List all areas/cities with NordVPN servers.
    features            List all possible features of NordVPN servers.
    types               List all possible types/categories of NordVPN servers.
    servers             List servers filtered by specified arguments.

optional arguments:
  -h, --help            show this help message and exit

Run a command with -h or --help for more information.
servers
usage: connord list servers [-h] [-c COUNTRY] [-a AREA] [-f FEATURE] [-t TYPE]
                            [--netflix]
                            [--max-load MAX_LOAD | --min-load MIN_LOAD | --load LOAD]
                            [--top TOP]

List servers filtered by one or more of the specified arguments. If no
arguments are given list all NordVPN servers. To see possible values for
--area, --country, --feature and --type have a look at the respective 'list'
commands.

optional arguments:
  -h, --help            show this help message and exit
  -c COUNTRY, --country COUNTRY
                        Select a specific country. May be specified multiple
                        times.
  -a AREA, --area AREA  Select a specific area. May be specified multiple
                        times.
  -f FEATURE, --feature FEATURE
                        Select servers with a specific list of features. May
                        be specified multiple times.
  -t TYPE, --type TYPE  Select servers with a specific type. May be specified
                        multiple times.
  --netflix             Select servers configured for netflix.
  --max-load MAX_LOAD   Filter servers by maximum load.
  --min-load MIN_LOAD   Filter servers by minimum load.
  --load LOAD           Filter servers by exact load match.
  --top TOP             Show TOP count resulting servers.

Update NordVPN server configuration files and the location database

usage: connord update [-h] [-f]

optional arguments:
  -h, --help   show this help message and exit
  -f, --force  Force update no matter of configuration.

Connect to NordVPN servers

usage: connord connect [-h] [-s SERVER | -b] [-c COUNTRY] [-a AREA]
                       [-f FEATURE] [-t TYPE] [--netflix]
                       [--max-load MAX_LOAD | --min-load MIN_LOAD | --load LOAD]
                       [-d] [-o OPENVPN_OPTIONS] [--udp | --tcp]

Connect to NordVPN servers. You may specify a single server of your choice
with -s SERVER, where SERVER is a COUNTRY_CODE followed by a number. This must
be a SERVER for which a configuration file exists. The same filters --area,
--country ... like in the 'list' command can be applied here. For a list of
possible values see the respective command in the 'list' command. 

optional arguments:
  -h, --help            show this help message and exit
  -s SERVER, --server SERVER
                        Connect to a specific server. Only -d, -o, --udp and
                        --tcp have an effect.
  -b, --best            Use best server depending on server load. When
                        multiple servers got the same load use the one with
                        the best ping. This is the default behaviour if not
                        specified on the command-line
  -c COUNTRY, --country COUNTRY
                        Select a specific country. May be specified multiple
                        times.
  -a AREA, --area AREA  Select a specific area. May be specified multiple
                        times.
  -f FEATURE, --feature FEATURE
                        Select servers with a specific feature. May be
                        specified multiple times.
  -t TYPE, --type TYPE  Select servers with a specific type. May be specified
                        multiple times.
  --netflix             Select servers configured for netflix.
  --max-load MAX_LOAD   Filter servers by maximum load.
  --min-load MIN_LOAD   Filter servers by minimum load.
  --load LOAD           Filter servers by exact load match.
  -d, --daemon          Start in daemon mode.
  -o OPENVPN_OPTIONS, --openvpn OPENVPN_OPTIONS
                        Options to pass through to openvpn as single string
  --udp                 Use UDP protocol. This is the default
  --tcp                 Use TCP protocol. Only one of --udp or --tcp may be
                        present.

Manage IPTables

usage: connord iptables [-h] {list,reload,flush,apply} ...

Manage your iptables configuration with this command. Under normal
cirumstances your rules files are automatically applied when running
'connect'. If somethings going wrong or you are modifying rules you can try
one of the commands defined here. You can list your current iptables rules
with the 'list' command as an alternative to the native iptables -L -vn
--line-num.

positional arguments:
  {list,reload,flush,apply}
    reload              Reload iptables configuration.
    flush               Flush iptables.
    apply               Apply iptables rules per 'table'.

optional arguments:
  -h, --help            show this help message and exit

Run a command with -h or --help for more information.

Supported FEATUREs:

ikev2                     IKEv2/IPSec Protocol
openvpn_udp               UDP
openvpn_tcp               TCP
socks                     Socks 5
proxy                     HTTP Proxy
pptp                      PPTP
l2tp                      L2TP/IPSec
openvpn_xor_udp           OpenVPN UDP Obfuscated
openvpn_xor_tcp           OpenVPN TCP Obfuscated
proxy_cybersec            HTTP Proxy CyberSec
proxy_ssl                 HTTP Proxy (SSL)
proxy_ssl_cybersec        HTTP CyberSec Proxy (SSL)
ikev2_v6                  IKEv2/IPSec IPv6
openvpn_udp_v6            UDPv6
openvpn_tcp_v6            TCPv6
wireguard_udp             WireGuard UDP
openvpn_udp_tls_crypt     UDP TLS encryption
openvpn_tcp_tls_crypt     TCP TLS encryption

Supported TYPEs:

double                    Double VPN
dedicated                 Dedicated IP
standard                  Standard VPN servers
p2p                       P2P
onion                     Onion Over VPN

Developing

Clone the repo and install the development environment:

$ git clone git@github.com:MaelStor/connord.git
$ cd connord
$ make venv
$ . .venv/bin/activate

You should be good to go from here. If you already have a virtualenv for connord then executing make develop is sufficient.

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