headscale

package module
v0.2.0 Latest Latest
Warning

This package is not in the latest version of its module.

 Go to latest Published: Jun 25, 2021 License: BSD-3-Clause Imports: 28 Imported by: 1

README ¶

Headscale

ci

An open source implementation of the Tailscale coordination server.

Overview

Tailscale is a modern VPN built on top of Wireguard. It works like an overlay network between the computers of your networks - using all kinds of NAT traversal sorcery.

Everything in Tailscale is Open Source, except the GUI clients for proprietary OS (Windows and macOS/iOS), and the 'coordination/control server'.

The control server works as an exchange point of cryptographic public keys for the nodes in the Tailscale network. It also assigns the IP addresses of the clients, creates the boundaries between each user, enables sharing machines between users, and exposes the advertised routes of your nodes.

Headscale implements this coordination server.

Status

  • Basic functionality (nodes can communicate with each other)
  • Node registration through the web flow
  • Network changes are relied to the nodes
  • Multiuser Namespace support
  • Basic routing (advertise & accept)
  • Share nodes between users namespaces
  • Node registration via pre-auth keys (including reusable keys and ephemeral node support)
  • JSON-formatted output
  • ACLs
  • DNS

... and probably lots of stuff missing

Roadmap 🤷

Basic multiuser support (multinamespace, actually) is now implemented. No node sharing or ACLs between namespaces yet though...

Suggestions/PRs welcomed!

Running it

  1. Download the Headscale binary https://github.com/juanfont/headscale/releases, and place it somewhere in your PATH

  2. (Optional, you can also use SQLite) Get yourself a PostgreSQL DB running

docker run --name headscale -e POSTGRES_DB=headscale -e \
  POSTGRES_USER=foo -e POSTGRES_PASSWORD=bar -p 5432:5432 -d postgres
  1. Set some stuff up (headscale Wireguard keys & the config.json file)
wg genkey > private.key
wg pubkey < private.key > public.key  # not needed

# Postgres
cp config.json.postgres.example config.json
# or
# SQLite
cp config.json.sqlite.example config.json
  1. Create a namespace (a namespace is a 'tailnet', a group of Tailscale nodes that can talk to each other)
headscale namespace create myfirstnamespace
  1. Run the server
headscale serve
  1. If you used tailscale.com before in your nodes, make sure you clear the tailscaled data folder
systemctl stop tailscaled
rm -fr /var/lib/tailscale
systemctl start tailscaled
  1. Add your first machine
tailscale up -login-server YOUR_HEADSCALE_URL

  1. Navigate to the URL you will get with tailscale up, where you'll find your machine key.

  2. In the server, register your machine to a namespace with the CLI

headscale -n myfirstnamespace node register YOURMACHINEKEY

Alternatively, you can use Auth Keys to register your machines:

  1. Create an authkey

    headscale -n myfirstnamespace preauthkey create --reusable --expiration 24h

  2. Use the authkey from your machine to register it

    tailscale up -login-server YOUR_HEADSCALE_URL --authkey YOURAUTHKEY

If you create an authkey with the --ephemeral flag, that key will create ephemeral nodes. This implies that --reusable is true.

Please bear in mind that all the commands from headscale support adding -o json or -o json-line to get a nicely JSON-formatted output.

Configuration reference

Headscale's configuration file is named config.json or config.yaml. Headscale will look for it in /etc/headscale, ~/.headscale and finally the directory from where the Headscale binary is executed.

    "server_url": "http://192.168.1.12:8000",
    "listen_addr": "0.0.0.0:8000",

server_url is the external URL via which Headscale is reachable. listen_addr is the IP address and port the Headscale program should listen on.

    "private_key_path": "private.key",

private_key_path is the path to the Wireguard private key. If the path is relative, it will be interpreted as relative to the directory the configuration file was read from.

    "derp_map_path": "derp.yaml",

derp_map_path is the path to the DERP map file. If the path is relative, it will be interpreted as relative to the directory the configuration file was read from.

    "ephemeral_node_inactivity_timeout": "30m",

ephemeral_node_inactivity_timeout is the timeout after which inactive ephemeral node records will be deleted from the database. The default is 30 minutes. This value must be higher than 65 seconds (the keepalive timeout for the HTTP long poll is 60 seconds, plus a few seconds to avoid race conditions).

    "db_host": "localhost",
    "db_port": 5432,
    "db_name": "headscale",
    "db_user": "foo",
    "db_pass": "bar",

The fields starting with db_ are used for the PostgreSQL connection information.

Running the service via TLS (optional)
    "tls_cert_path": ""
    "tls_key_path": ""

Headscale can be configured to expose its web service via TLS. To configure the certificate and key file manually, set the tls_cert_path and tls_cert_path configuration parameters. If the path is relative, it will be interpreted as relative to the directory the configuration file was read from.

    "tls_letsencrypt_hostname": "",
    "tls_letsencrypt_cache_dir": ".cache",
    "tls_letsencrypt_challenge_type": "HTTP-01",

To get a certificate automatically via Let's Encrypt, set tls_letsencrypt_hostname to the desired certificate hostname. This name must resolve to the IP address(es) Headscale is reachable on (i.e., it must correspond to the server_url configuration parameter). The certificate and Let's Encrypt account credentials will be stored in the directory configured in tls_letsencrypt_cache_dir. If the path is relative, it will be interpreted as relative to the directory the configuration file was read from. The certificate will automatically be renewed as needed. The default challenge type HTTP-01 requires that Headscale listens on port 80 for the Let's Encrypt automated validation, in addition to whatever port is configured in listen_addr. Alternatively, tls_letsencrypt_challenge_type can be set to TLS-ALPN-01. In this configuration, Headscale must be reachable via port 443, but port 80 is not required.

Disclaimer

  1. We have nothing to do with Tailscale, or Tailscale Inc.
  2. The purpose of writing this was to learn how Tailscale works.

More on Tailscale

Documentation ¶

Index ¶

Constants ¶

This section is empty.

Variables ¶

This section is empty.

Functions ¶

This section is empty.

Types ¶

type Config ¶ 

type Config struct {
	ServerURL                      string
	Addr                           string
	PrivateKeyPath                 string
	DerpMap                        *tailcfg.DERPMap
	EphemeralNodeInactivityTimeout time.Duration

	DBtype string
	DBpath string
	DBhost string
	DBport int
	DBname string
	DBuser string
	DBpass string

	TLSLetsEncryptHostname      string
	TLSLetsEncryptCacheDir      string
	TLSLetsEncryptChallengeType string

	TLSCertPath string
	TLSKeyPath  string
}

Config contains the initial Headscale configuration

type Error ¶ 

type Error string

Error is used to compare errors as per https://dave.cheney.net/2016/04/07/constant-errors

func (Error) Error ¶ 

func (e Error) Error() string

type Headscale ¶ 

type Headscale struct {
	// contains filtered or unexported fields
}

Headscale represents the base app of the service

func NewHeadscale ¶ 

func NewHeadscale(cfg Config) (*Headscale, error)

NewHeadscale returns the Headscale app

func (*Headscale) CreateNamespace ¶ 

func (h *Headscale) CreateNamespace(name string) (*Namespace, error)

CreateNamespace creates a new Namespace. Returns error if could not be created or another namespace already exists

func (*Headscale) CreatePreAuthKey ¶ 

func (h *Headscale) CreatePreAuthKey(namespaceName string, reusable bool, ephemeral bool, expiration *time.Time) (*PreAuthKey, error)

CreatePreAuthKey creates a new PreAuthKey in a namespace, and returns it

func (*Headscale) DestroyNamespace ¶ 

func (h *Headscale) DestroyNamespace(name string) error

DestroyNamespace destroys a Namespace. Returns error if the Namespace does not exist or if there are machines associated with it.

func (*Headscale) EnableNodeRoute ¶ 

func (h *Headscale) EnableNodeRoute(namespace string, nodeName string, routeStr string) (*netaddr.IPPrefix, error)

EnableNodeRoute enables a subnet route advertised by a node (identified by namespace and node name)

func (*Headscale) ExpireEphemeralNodes ¶ 

func (h *Headscale) ExpireEphemeralNodes(milliSeconds int64)

ExpireEphemeralNodes deletes ephemeral machine records that have not been seen for longer than h.cfg.EphemeralNodeInactivityTimeout

func (*Headscale) GetMachine ¶ 

func (h *Headscale) GetMachine(namespace string, name string) (*Machine, error)

GetMachine finds a Machine by name and namespace and returns the Machine struct

func (*Headscale) GetNamespace ¶ 

func (h *Headscale) GetNamespace(name string) (*Namespace, error)

GetNamespace fetches a namespace by name

func (*Headscale) GetNodeRoutes ¶ 

func (h *Headscale) GetNodeRoutes(namespace string, nodeName string) (*[]netaddr.IPPrefix, error)

GetNodeRoutes returns the subnet routes advertised by a node (identified by namespace and node name)

func (*Headscale) GetPreAuthKeys ¶ 

func (h *Headscale) GetPreAuthKeys(namespaceName string) (*[]PreAuthKey, error)

GetPreAuthKeys returns the list of PreAuthKeys for a namespace

func (*Headscale) KeyHandler ¶ 

func (h *Headscale) KeyHandler(c *gin.Context)

KeyHandler provides the Headscale pub key Listens in /key

func (*Headscale) ListMachinesInNamespace ¶ 

func (h *Headscale) ListMachinesInNamespace(name string) (*[]Machine, error)

ListMachinesInNamespace gets all the nodes in a given namespace

func (*Headscale) ListNamespaces ¶ 

func (h *Headscale) ListNamespaces() (*[]Namespace, error)

ListNamespaces gets all the existing namespaces

func (*Headscale) PollNetMapHandler ¶ 

func (h *Headscale) PollNetMapHandler(c *gin.Context)

PollNetMapHandler takes care of /machine/:id/map

This is the busiest endpoint, as it keeps the HTTP long poll that updates the clients when something in the network changes.

The clients POST stuff like HostInfo and their Endpoints here, but only after their first request (marked with the ReadOnly field).

At this moment the updates are sent in a quite horrendous way, but they kinda work.

func (*Headscale) RegisterMachine ¶ 

func (h *Headscale) RegisterMachine(key string, namespace string) (*Machine, error)

RegisterMachine is executed from the CLI to register a new Machine using its MachineKey

func (*Headscale) RegisterWebAPI ¶ 

func (h *Headscale) RegisterWebAPI(c *gin.Context)

RegisterWebAPI shows a simple message in the browser to point to the CLI Listens in /register

func (*Headscale) RegistrationHandler ¶ 

func (h *Headscale) RegistrationHandler(c *gin.Context)

RegistrationHandler handles the actual registration process of a machine Endpoint /machine/:id

func (*Headscale) Serve ¶ 

func (h *Headscale) Serve() error

Serve launches a GIN server with the Headscale API

func (*Headscale) SetMachineNamespace ¶ 

func (h *Headscale) SetMachineNamespace(m *Machine, namespaceName string) error

SetMachineNamespace assigns a Machine to a namespace

type KV ¶ 

type KV struct {
	Key   string
	Value string
}

KV is a key-value store in a psql table. For future use...

type Machine ¶ 

type Machine struct {
	ID          uint64 `gorm:"primary_key"`
	MachineKey  string `gorm:"type:varchar(64);unique_index"`
	NodeKey     string
	DiscoKey    string
	IPAddress   string
	Name        string
	NamespaceID uint
	Namespace   Namespace `gorm:"foreignKey:NamespaceID"`

	Registered     bool // temp
	RegisterMethod string
	AuthKeyID      uint
	AuthKey        *PreAuthKey

	LastSeen *time.Time
	Expiry   *time.Time

	HostInfo      datatypes.JSON
	Endpoints     datatypes.JSON
	EnabledRoutes datatypes.JSON

	CreatedAt time.Time
	UpdatedAt time.Time
	DeletedAt *time.Time
}

Machine is a Headscale client

func (*Machine) GetHostInfo ¶ 

func (m *Machine) GetHostInfo() (*tailcfg.Hostinfo, error)

GetHostInfo returns a Hostinfo struct for the machine

type Namespace ¶ 

type Namespace struct {
	gorm.Model
	Name string `gorm:"unique"`
}

Namespace is the way Headscale implements the concept of users in Tailscale

At the end of the day, users in Tailscale are some kind of 'bubbles' or namespaces that contain our machines.

type PreAuthKey ¶ 

type PreAuthKey struct {
	ID          uint64 `gorm:"primary_key"`
	Key         string
	NamespaceID uint
	Namespace   Namespace
	Reusable    bool
	Ephemeral   bool `gorm:"default:false"`

	CreatedAt  *time.Time
	Expiration *time.Time
}

PreAuthKey describes a pre-authorization key usable in a particular namespace

Source Files ¶

View all Source files

Directories ¶

Path Synopsis
cmd
headscale
headscale/cli

Jump to

Keyboard shortcuts

? : This menu
/ : Search site
f or F : Jump to
y or Y : Canonical URL
go.dev uses cookies from Google to deliver and enhance the quality of its services and to analyze traffic. Learn more.