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/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2019 WireGuard LLC. All Rights Reserved.
*/
package tunnel
import (
"bytes"
"encoding/binary"
"sort"
"unsafe"
"golang.org/x/crypto/blake2s"
"golang.org/x/sys/windows"
"golang.org/x/text/unicode/norm"
"golang.zx2c4.com/wireguard/windows/conf"
)
const deterministicGUIDLabel = "Deterministic WireGuard Windows GUID v1 jason@zx2c4.com"
/* All peer public keys and allowed ips are sorted. Length/number fields are
* little endian 32-bit. Hash input is:
*
* label || len(interface name) || interface name ||
* interface public key || number of peers ||
* peer public key || number of peer allowed ips ||
* len(allowed ip string) || allowed ip/cidr in canonical string notation ||
* len(allowed ip string) || allowed ip/cidr in canonical string notation ||
* len(allowed ip string) || allowed ip/cidr in canonical string notation ||
* ...
* peer public key || number of peer allowed ips ||
* len(allowed ip string) || allowed ip/cidr in canonical string notation ||
* len(allowed ip string) || allowed ip/cidr in canonical string notation ||
* len(allowed ip string) || allowed ip/cidr in canonical string notation ||
* ...
* ...
*/
func deterministicGUID(c *conf.Config) *windows.GUID {
b2, _ := blake2s.New256(nil)
b2.Write([]byte(deterministicGUIDLabel))
b2Number := func(i int) {
if uint(i) > uint(^uint32(0)) {
panic("length out of bounds")
}
var bytes [4]byte
binary.LittleEndian.PutUint32(bytes[:], uint32(i))
b2.Write(bytes[:])
}
b2String := func(s string) {
bytes := []byte(s)
bytes = norm.NFC.Bytes(bytes)
b2Number(len(bytes))
b2.Write(bytes)
}
b2Key := func(k *conf.Key) {
b2.Write(k[:])
}
b2String(c.Name)
b2Key(c.Interface.PrivateKey.Public())
b2Number(len(c.Peers))
sortedPeers := c.Peers
sort.Slice(sortedPeers, func(i, j int) bool {
return bytes.Compare(sortedPeers[i].PublicKey[:], sortedPeers[j].PublicKey[:]) < 0
})
for _, peer := range sortedPeers {
b2Key(&peer.PublicKey)
b2Number(len(peer.AllowedIPs))
sortedAllowedIPs := peer.AllowedIPs
sort.Slice(sortedAllowedIPs, func(i, j int) bool {
if bi, bj := sortedAllowedIPs[i].Bits(), sortedAllowedIPs[j].Bits(); bi != bj {
return bi < bj
}
if sortedAllowedIPs[i].Cidr != sortedAllowedIPs[j].Cidr {
return sortedAllowedIPs[i].Cidr < sortedAllowedIPs[j].Cidr
}
return bytes.Compare(sortedAllowedIPs[i].IP[:], sortedAllowedIPs[j].IP[:]) < 0
})
for _, allowedip := range sortedAllowedIPs {
b2String(allowedip.String())
}
}
return (*windows.GUID)(unsafe.Pointer(&b2.Sum(nil)[0]))
}
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