mirror of
https://github.com/juanfont/headscale.git
synced 2024-12-20 19:09:07 +01:00
122 lines
3.0 KiB
Go
122 lines
3.0 KiB
Go
// 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"
|
|
|
|
"golang.org/x/crypto/nacl/box"
|
|
"tailscale.com/wgengine/wgcfg"
|
|
)
|
|
|
|
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
|
|
}
|
|
}
|