From 7198c8bd7733a3adba8b4f9594aff2964707142a Mon Sep 17 00:00:00 2001 From: Juan Font Alonso Date: Sun, 21 Jun 2020 12:32:08 +0200 Subject: [PATCH] Initial commit --- .gitignore | 4 + README.md | 11 +- app.go | 63 +++++++ config.json.example | 11 ++ db.go | 70 ++++++++ go.mod | 13 ++ go.sum | 408 ++++++++++++++++++++++++++++++++++++++++++++ handlers.go | 323 +++++++++++++++++++++++++++++++++++ machine.go | 125 ++++++++++++++ utils.go | 121 +++++++++++++ 10 files changed, 1147 insertions(+), 2 deletions(-) create mode 100644 app.go create mode 100644 config.json.example create mode 100644 db.go create mode 100644 go.mod create mode 100644 go.sum create mode 100644 handlers.go create mode 100644 machine.go create mode 100644 utils.go diff --git a/.gitignore b/.gitignore index 66fd13c9..751dd847 100644 --- a/.gitignore +++ b/.gitignore @@ -13,3 +13,7 @@ # Dependency directories (remove the comment below to include it) # vendor/ + +config.json +headscale +*.key diff --git a/README.md b/README.md index 62a3cede..27a34b1c 100644 --- a/README.md +++ b/README.md @@ -24,12 +24,19 @@ An open source implementation of the Tailscale coordination server. POSTGRES_USER=foo -e POSTGRES_PASSWORD=bar -p 5432:5432 -d postgres ``` -3. Run it (asuming you have renamed the config.json.example to config.json) +3. Sort some stuff up (headscale Wireguard keys & the config.json file) + ``` + wg genkey > private.key + wg pubkey < private.key > public.key + cp config.json.example config.json + ``` + +4. Run it ``` ./headcale ``` -4. Add your first machine +5. Add your first machine ``` tailscale up -login-server YOUR_HEADSCALE_URL ``` diff --git a/app.go b/app.go new file mode 100644 index 00000000..f2385e92 --- /dev/null +++ b/app.go @@ -0,0 +1,63 @@ +package headscale + +import ( + "fmt" + "io/ioutil" + + "github.com/gin-gonic/gin" + + "github.com/tailscale/wireguard-go/wgcfg" +) + +type Config struct { + ServerURL string + Addr string + PrivateKeyPath string + + DBhost string + DBport int + DBname string + DBuser string + DBpass string +} + +type Headscale struct { + cfg Config + dbString string + publicKey *wgcfg.Key + privateKey *wgcfg.PrivateKey +} + +func NewHeadscale(cfg Config) (*Headscale, error) { + content, err := ioutil.ReadFile(cfg.PrivateKeyPath) + if err != nil { + return nil, err + } + privKey, err := wgcfg.ParsePrivateKey(string(content)) + if err != nil { + return nil, err + } + pubKey := privKey.Public() + h := Headscale{ + cfg: cfg, + dbString: fmt.Sprintf("host=%s port=%d dbname=%s user=%s password=%s sslmode=disable", cfg.DBhost, + cfg.DBport, cfg.DBname, cfg.DBuser, cfg.DBpass), + privateKey: privKey, + publicKey: &pubKey, + } + err = h.initDB() + if err != nil { + return nil, err + } + return &h, nil +} + +func (h *Headscale) Serve() error { + r := gin.Default() + r.GET("/key", h.KeyHandler) + r.GET("/register", h.RegisterWebAPI) + r.POST("/machine/:id/map", h.PollNetMapHandler) + r.POST("/machine/:id", h.RegistrationHandler) + err := r.Run(h.cfg.Addr) + return err +} diff --git a/config.json.example b/config.json.example new file mode 100644 index 00000000..069b20b2 --- /dev/null +++ b/config.json.example @@ -0,0 +1,11 @@ +{ + "server_url": "http://192.168.1.12:8000", + "listen_addr": "0.0.0.0:8000", + "private_key_path": "private.key", + "public_key_path": "public.key", + "db_host": "localhost", + "db_port": 5432, + "db_name": "headscale", + "db_user": "foo", + "db_pass": "bar" +} \ No newline at end of file diff --git a/db.go b/db.go new file mode 100644 index 00000000..880e0ba9 --- /dev/null +++ b/db.go @@ -0,0 +1,70 @@ +package headscale + +import ( + "errors" + + "github.com/jinzhu/gorm" + _ "github.com/jinzhu/gorm/dialects/postgres" +) + +const dbVersion = "1" + +type KV struct { + Key string + Value string +} + +func (h *Headscale) initDB() error { + db, err := gorm.Open("postgres", h.dbString) + if err != nil { + return err + } + db.Exec("create extension if not exists \"uuid-ossp\";") + db.AutoMigrate(&Machine{}) + db.AutoMigrate(&KV{}) + db.Close() + + h.setValue("db_version", dbVersion) + return nil +} + +func (h *Headscale) db() (*gorm.DB, error) { + db, err := gorm.Open("postgres", h.dbString) + if err != nil { + return nil, err + } + return db, nil +} + +func (h *Headscale) getValue(key string) (string, error) { + db, err := h.db() + if err != nil { + return "", err + } + defer db.Close() + var row KV + if db.First(&row, "key = ?", key).RecordNotFound() { + return "", errors.New("not found") + } + return row.Value, nil +} + +func (h *Headscale) setValue(key string, value string) error { + kv := KV{ + Key: key, + Value: value, + } + db, err := h.db() + if err != nil { + return err + } + defer db.Close() + _, err = h.getValue(key) + if err == nil { + db.Model(&kv).Where("key = ?", key).Update("value", value) + return nil + } + + db.Create(kv) + return nil +} diff --git a/go.mod b/go.mod new file mode 100644 index 00000000..1d0dd2d5 --- /dev/null +++ b/go.mod @@ -0,0 +1,13 @@ +module github.com/juanfont/headscale + +go 1.14 + +require ( + github.com/gin-gonic/gin v1.6.3 + github.com/jinzhu/gorm v1.9.14 + github.com/klauspost/compress v1.9.8 + github.com/spf13/viper v1.7.0 + github.com/tailscale/wireguard-go v0.0.0-20200615180905-687c10194779 + golang.org/x/crypto v0.0.0-20200604202706-70a84ac30bf9 + tailscale.com v0.99.1 +) diff --git a/go.sum b/go.sum new file mode 100644 index 00000000..93a4d58e --- /dev/null +++ b/go.sum @@ -0,0 +1,408 @@ +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= 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"github.com/jinzhu/gorm/dialects/postgres" + "github.com/klauspost/compress/zstd" + "github.com/tailscale/wireguard-go/wgcfg" + "tailscale.com/tailcfg" +) + +func (h *Headscale) KeyHandler(c *gin.Context) { + c.Data(200, "text/plain; charset=utf-8", []byte(h.publicKey.HexString())) +} + +func (h *Headscale) RegistrationHandler(c *gin.Context) { + body, _ := ioutil.ReadAll(c.Request.Body) + mKeyStr := c.Param("id") + mKey, err := wgcfg.ParseHexKey(mKeyStr) + if err != nil { + log.Printf("Cannot parse machine key: %s", err) + c.String(http.StatusInternalServerError, "Sad!") + return + } + req := tailcfg.RegisterRequest{} + err = decode(body, &req, &mKey, h.privateKey) + if err != nil { + log.Printf("Cannot decode message: %s", err) + c.String(http.StatusInternalServerError, "Very sad!") + return + } + db, err := h.db() + if err != nil { + log.Printf("Cannot open DB: %s", err) + c.String(http.StatusInternalServerError, ":(") + return + } + defer db.Close() + var m Machine + resp := tailcfg.RegisterResponse{} + + if db.First(&m, "machine_key = ?", mKey.HexString()).RecordNotFound() { + log.Println("New Machine!") + h.handleNewServer(c, db, mKey, req) + return + } + + // We do have the updated key! + if m.NodeKey == wgcfg.Key(req.NodeKey).HexString() { + if m.Registered { + log.Println("Registered and we have the updated key! Lets move to map") + resp.AuthURL = "" + respBody, err := encode(resp, &mKey, h.privateKey) + if err != nil { + log.Printf("Cannot encode message: %s", err) + c.String(http.StatusInternalServerError, "Extremely sad!") + return + } + c.Data(200, "application/json; charset=utf-8", respBody) + return + } + + log.Println("Hey! Not registered. Not asking for key rotation. Send a passive-agressive authurl to register") + resp.AuthURL = fmt.Sprintf("%s/register?key=%s", + h.cfg.ServerURL, mKey.HexString()) + respBody, err := encode(resp, &mKey, h.privateKey) + if err != nil { + log.Printf("Cannot encode message: %s", err) + c.String(http.StatusInternalServerError, "Extremely sad!") + return + } + c.Data(200, "application/json; charset=utf-8", respBody) + return + + } + + // We dont have the updated key in the DB. Lets try with the old one. + if m.NodeKey == wgcfg.Key(req.OldNodeKey).HexString() { + log.Println("Key rotation!") + m.NodeKey = wgcfg.Key(req.NodeKey).HexString() + db.Save(&m) + resp.AuthURL = "" + respBody, err := encode(resp, &mKey, h.privateKey) + if err != nil { + log.Printf("Cannot encode message: %s", err) + c.String(http.StatusInternalServerError, "Extremely sad!") + return + } + c.Data(200, "application/json; charset=utf-8", respBody) + return + } + + log.Println("We dont know anything about the new key. WTF") +} + +func (h *Headscale) PollNetMapHandler(c *gin.Context) { + body, _ := ioutil.ReadAll(c.Request.Body) + mKeyStr := c.Param("id") + mKey, err := wgcfg.ParseHexKey(mKeyStr) + if err != nil { + log.Printf("Cannot parse client key: %s", err) + c.String(http.StatusOK, "Sad!") + return + } + req := tailcfg.MapRequest{} + err = decode(body, &req, &mKey, h.privateKey) + if err != nil { + log.Printf("Cannot decode message: %s", err) + c.String(http.StatusOK, "Very sad!") + // return + } + + db, err := h.db() + if err != nil { + log.Printf("Cannot open DB: %s", err) + c.String(http.StatusInternalServerError, ":(") + return + } + var m Machine + if db.First(&m, "machine_key = ?", mKey.HexString()).RecordNotFound() { + log.Printf("Cannot encode message: %s", err) + c.String(http.StatusOK, "Extremely sad!") + return + } + + endpoints, _ := json.Marshal(req.Endpoints) + hostinfo, _ := json.Marshal(req.Hostinfo) + m.Endpoints = postgres.Jsonb{RawMessage: json.RawMessage(endpoints)} + m.HostInfo = postgres.Jsonb{RawMessage: json.RawMessage(hostinfo)} + now := time.Now().UTC() + m.LastSeen = &now + db.Save(&m) + db.Close() + + chanStream := make(chan []byte, 1) + go func() { + defer close(chanStream) + + data, err := h.getMapResponse(mKey, req, m) + if err != nil { + c.String(http.StatusInternalServerError, ":(") + return + } + + //send initial dump + chanStream <- *data + for { + + data, err := h.getMapKeepAliveResponse(mKey, req, m) + if err != nil { + c.String(http.StatusInternalServerError, ":(") + return + } + chanStream <- *data + // keep the node entertained + time.Sleep(time.Second * 180) + break + } + + }() + c.Stream(func(w io.Writer) bool { + if msg, ok := <-chanStream; ok { + log.Printf("🦀 Sending data to %s: %d bytes", c.Request.RemoteAddr, len(msg)) + w.Write(msg) + return true + } else { + log.Printf("🦄 Closing connection to %s", c.Request.RemoteAddr) + c.AbortWithStatus(200) + return false + } + }) + +} + +func (h *Headscale) getMapResponse(mKey wgcfg.Key, req tailcfg.MapRequest, m Machine) (*[]byte, error) { + node, err := m.toNode() + if err != nil { + log.Printf("Cannot convert to node: %s", err) + return nil, err + } + peers, err := h.getPeers(m) + if err != nil { + log.Printf("Cannot fetch peers: %s", err) + return nil, err + } + resp := tailcfg.MapResponse{ + KeepAlive: false, + Node: node, + Peers: *peers, + DNS: []wgcfg.IP{}, + SearchPaths: []string{}, + Domain: "foobar@example.com", + PacketFilter: tailcfg.FilterAllowAll, + DERPMap: &tailcfg.DERPMap{}, + UserProfiles: []tailcfg.UserProfile{}, + Roles: []tailcfg.Role{}} + + var respBody []byte + if req.Compress == "zstd" { + src, _ := json.Marshal(resp) + encoder, _ := zstd.NewWriter(nil) + srcCompressed := encoder.EncodeAll(src, nil) + respBody, err = encodeMsg(srcCompressed, &mKey, h.privateKey) + if err != nil { + return nil, err + } + } else { + respBody, err = encode(resp, &mKey, h.privateKey) + if err != nil { + return nil, err + } + } + + // declare the incoming size on the first 4 bytes + data := make([]byte, 4) + binary.LittleEndian.PutUint32(data, uint32(len(respBody))) + data = append(data, respBody...) + return &data, nil +} + +func (h *Headscale) getMapKeepAliveResponse(mKey wgcfg.Key, req tailcfg.MapRequest, m Machine) (*[]byte, error) { + resp := tailcfg.MapResponse{ + KeepAlive: true, + } + var respBody []byte + var err error + if req.Compress == "zstd" { + src, _ := json.Marshal(resp) + encoder, _ := zstd.NewWriter(nil) + srcCompressed := encoder.EncodeAll(src, nil) + respBody, err = encodeMsg(srcCompressed, &mKey, h.privateKey) + if err != nil { + return nil, err + } + } else { + respBody, err = encode(resp, &mKey, h.privateKey) + if err != nil { + return nil, err + } + } + data := make([]byte, 4) + binary.LittleEndian.PutUint32(data, uint32(len(respBody))) + data = append(data, respBody...) + return &data, nil +} + +// RegisterWebAPI attaches the machine to a user or team. +// Currently this is a rather temp implementation, as it just registers it. +func (h *Headscale) RegisterWebAPI(c *gin.Context) { + mKeyStr := c.Query("key") + if mKeyStr == "" { + c.String(http.StatusBadRequest, "Wrong params") + return + } + mKey, err := wgcfg.ParseHexKey(mKeyStr) + if err != nil { + log.Printf("Cannot parse client key: %s", err) + c.String(http.StatusInternalServerError, "Sad!") + return + } + db, err := h.db() + if err != nil { + log.Printf("Cannot open DB: %s", err) + c.String(http.StatusInternalServerError, ":(") + return + } + defer db.Close() + m := Machine{} + if db.First(&m, "machine_key = ?", mKey.HexString()).RecordNotFound() { + log.Printf("Cannot find machine with machine key: %s", mKey.Base64()) + c.String(http.StatusNotFound, "Sad!") + return + } + + if !m.isAlreadyRegistered() { + ip, err := h.getAvailableIP() + if err != nil { + log.Println(err) + c.String(http.StatusInternalServerError, "Upsy dupsy") + return + } + m.IPAddress = ip.String() + m.Registered = true // very naive 😱 + db.Save(&m) + + c.JSON(http.StatusOK, gin.H{"msg": "Ook"}) + return + } + c.JSON(http.StatusOK, gin.H{"msg": "Eek"}) +} + +func (h *Headscale) handleNewServer(c *gin.Context, db *gorm.DB, idKey wgcfg.Key, req tailcfg.RegisterRequest) { + mNew := Machine{ + MachineKey: idKey.HexString(), + NodeKey: wgcfg.Key(req.NodeKey).HexString(), + Expiry: &req.Expiry, + } + if err := db.Create(&mNew).Error; err != nil { + log.Printf("Could not create row: %s", err) + return + } + resp := tailcfg.RegisterResponse{ + AuthURL: fmt.Sprintf("%s/register?key=%s", + h.cfg.ServerURL, idKey.HexString()), + } + + respBody, err := encode(resp, &idKey, h.privateKey) + if err != nil { + log.Printf("Cannot encode message: %s", err) + c.String(http.StatusInternalServerError, "Extremely sad!") + return + } + c.Data(200, "application/json; charset=utf-8", respBody) +} diff --git a/machine.go b/machine.go new file mode 100644 index 00000000..6d857c7a --- /dev/null +++ b/machine.go @@ -0,0 +1,125 @@ +package headscale + +import ( + "encoding/json" + "fmt" + "log" + "time" + + "github.com/jinzhu/gorm/dialects/postgres" + "github.com/tailscale/wireguard-go/wgcfg" + "tailscale.com/tailcfg" +) + +type Machine struct { + ID uint64 `gorm:"primary_key"` + MachineKey string `gorm:"type:varchar(64);unique_index"` + NodeKey string + IPAddress string + + Registered bool // temp + LastSeen *time.Time + Expiry *time.Time + + HostInfo postgres.Jsonb + Endpoints postgres.Jsonb + + CreatedAt time.Time + UpdatedAt time.Time + DeletedAt *time.Time +} + +// For the time being this method is rather naive +func (m Machine) isAlreadyRegistered() bool { + return m.Registered +} + +func (m Machine) toNode() (*tailcfg.Node, error) { + nKey, err := wgcfg.ParseHexKey(m.NodeKey) + if err != nil { + return nil, err + } + mKey, err := wgcfg.ParseHexKey(m.MachineKey) + if err != nil { + return nil, err + } + addrs := []wgcfg.CIDR{} + allowedIPs := []wgcfg.CIDR{} + + ip, err := wgcfg.ParseCIDR(fmt.Sprintf("%s/32", m.IPAddress)) + if err != nil { + return nil, err + } + addrs = append(addrs, ip) + allowedIPs = append(allowedIPs, ip) // looks like the client expect this + + endpoints := []string{} + be, err := m.Endpoints.MarshalJSON() + if err != nil { + return nil, err + } + err = json.Unmarshal(be, &endpoints) + if err != nil { + return nil, err + } + + hostinfo := tailcfg.Hostinfo{} + hi, err := m.HostInfo.MarshalJSON() + if err != nil { + return nil, err + } + err = json.Unmarshal(hi, &hostinfo) + if err != nil { + return nil, err + } + + n := tailcfg.Node{ + ID: tailcfg.NodeID(m.ID), // this is the actual ID + Name: "", + User: 1, + Key: tailcfg.NodeKey(nKey), + KeyExpiry: *m.Expiry, + Machine: tailcfg.MachineKey(mKey), + Addresses: addrs, + AllowedIPs: allowedIPs, + Endpoints: endpoints, + // DERP: "127.3.3.40:4", // wtf? + + Hostinfo: hostinfo, + Created: m.CreatedAt, + LastSeen: m.LastSeen, + + KeepAlive: false, + MachineAuthorized: m.Registered, + } + // n.Key.MarshalText() + return &n, nil +} + +func (h *Headscale) getPeers(m Machine) (*[]*tailcfg.Node, error) { + db, err := h.db() + if err != nil { + log.Printf("Cannot open DB: %s", err) + return nil, err + } + defer db.Close() + + // Add user management here? + machines := []Machine{} + if err = db.Where("machine_key <> ?", m.MachineKey).Find(&machines).Error; err != nil { + log.Printf("Error accessing db: %s", err) + return nil, err + } + + log.Printf("Found %d peers of %s", len(machines), m.MachineKey) + + peers := []*tailcfg.Node{} + for _, mn := range machines { + peer, err := mn.toNode() + if err != nil { + return nil, err + } + peers = append(peers, peer) + } + return &peers, nil +} diff --git a/utils.go b/utils.go new file mode 100644 index 00000000..1bf75161 --- /dev/null +++ b/utils.go @@ -0,0 +1,121 @@ +// Codehere is mostly taken from github.com/tailscale/tailscale +// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package headscale + +import ( + "crypto/rand" + "encoding/binary" + "encoding/json" + "errors" + "fmt" + "io" + "net" + + mathrand "math/rand" + + "github.com/tailscale/wireguard-go/wgcfg" + "golang.org/x/crypto/nacl/box" +) + +func decode(msg []byte, v interface{}, pubKey *wgcfg.Key, privKey *wgcfg.PrivateKey) error { + return decodeMsg(msg, v, pubKey, privKey) +} + +func decodeMsg(msg []byte, v interface{}, pubKey *wgcfg.Key, privKey *wgcfg.PrivateKey) error { + decrypted, err := decryptMsg(msg, pubKey, privKey) + if err != nil { + return err + } + // fmt.Println(string(decrypted)) + if err := json.Unmarshal(decrypted, v); err != nil { + return fmt.Errorf("response: %v", err) + } + return nil +} + +func decryptMsg(msg []byte, pubKey *wgcfg.Key, privKey *wgcfg.PrivateKey) ([]byte, error) { + var nonce [24]byte + if len(msg) < len(nonce)+1 { + return nil, fmt.Errorf("response missing nonce, len=%d", len(msg)) + } + copy(nonce[:], msg) + msg = msg[len(nonce):] + + pub, pri := (*[32]byte)(pubKey), (*[32]byte)(privKey) + decrypted, ok := box.Open(nil, msg, &nonce, pub, pri) + if !ok { + return nil, fmt.Errorf("cannot decrypt response") + } + return decrypted, nil +} + +func encode(v interface{}, pubKey *wgcfg.Key, privKey *wgcfg.PrivateKey) ([]byte, error) { + b, err := json.Marshal(v) + if err != nil { + return nil, err + } + return encodeMsg(b, pubKey, privKey) +} + +func encodeMsg(b []byte, pubKey *wgcfg.Key, privKey *wgcfg.PrivateKey) ([]byte, error) { + var nonce [24]byte + if _, err := io.ReadFull(rand.Reader, nonce[:]); err != nil { + panic(err) + } + pub, pri := (*[32]byte)(pubKey), (*[32]byte)(privKey) + msg := box.Seal(nonce[:], b, &nonce, pub, pri) + return msg, nil +} + +func (h *Headscale) getAvailableIP() (*net.IP, error) { + db, err := h.db() + if err != nil { + return nil, err + } + defer db.Close() + i := 0 + for { + ip, err := getRandomIP() + if err != nil { + return nil, err + } + m := Machine{} + if db.First(&m, "ip_address = ?", ip.String()).RecordNotFound() { + return ip, nil + } + i++ + if i == 100 { // really random number + break + } + } + return nil, errors.New("Could not find an available IP address in 100.64.0.0/10") +} + +func getRandomIP() (*net.IP, error) { + ipo, ipnet, err := net.ParseCIDR("100.64.0.0/10") + + if err == nil { + ip := ipo.To4() + fmt.Println("In Randomize IPAddr: IP ", ip, " IPNET: ", ipnet) + fmt.Println("Final address is ", ip) + // fmt.Println("Broadcast address is ", ipb) + // fmt.Println("Network address is ", ipn) + + ipRaw := make([]byte, 4) + binary.LittleEndian.PutUint32(ipRaw, mathrand.Uint32()) + // ipRaw[3] = 254 + // fmt.Println("ipRaw is ", ipRaw) + for i, v := range ipRaw { + // fmt.Println("IP Before: ", ip[i], " v is ", v, " Mask is: ", ipnet.Mask[i]) + ip[i] = ip[i] + (v &^ ipnet.Mask[i]) + // fmt.Println("IP After: ", ip[i]) + } + fmt.Println("FINAL IP: ", ip.String()) + return &ip, nil + } else { + return nil, err + } +}