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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.zx2c4.com/wireguard/windows/conf"
)
const deterministicGUIDLabel = "Deterministic WireGuard Windows GUID for interface: "
/* All peer public keys and allowed ips are sorted. Hash input is:
*
* label || interface name || zero padding to blake2s blocksize ||
* interface public key ||
* little endian 32-bit number of peers ||
* peer public key || little endian 32-bit number of peer allowed ips ||
* allowed ip in canonical string notation || '/' || cidr in decimal || '\n' ||
* allowed ip in canonical string notation || '/' || cidr in decimal || '\n' ||
* ...
* peer public key || little endian 32-bit number of peer allowed ips ||
* allowed ip in canonical string notation || '/' || cidr in decimal || '\n' ||
* allowed ip in canonical string notation || '/' || cidr in decimal || '\n' ||
* ...
* ...
*/
func deterministicGUID(conf *conf.Config) *windows.GUID {
b2, _ := blake2s.New256(nil)
u32 := func(i uint32) {
var bytes [4]byte
binary.LittleEndian.PutUint32(bytes[:], i)
b2.Write(bytes[:])
}
header := []byte(deterministicGUIDLabel)
header = append(header, []byte(conf.Name)...)
b2.Write(header)
b2.Write(make([]byte, (((len(header)-1)|(blake2s.BlockSize-1))+1)-len(header)))
b2.Write(conf.Interface.PrivateKey.Public()[:])
u32(uint32(len(conf.Peers)))
sortedPeers := conf.Peers
sort.Slice(sortedPeers, func(i, j int) bool {
return bytes.Compare(sortedPeers[i].PublicKey[:], sortedPeers[j].PublicKey[:]) < 0
})
for _, peer := range sortedPeers {
b2.Write(peer.PublicKey[:])
u32(uint32(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 {
b2.Write([]byte(allowedip.String() + "\n"))
}
}
return (*windows.GUID)(unsafe.Pointer(&b2.Sum(nil)[0]))
}
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