diff options
Diffstat (limited to 'tunnel/deterministicguid.go')
| -rw-r--r-- | tunnel/deterministicguid.go | 62 |
1 files changed, 38 insertions, 24 deletions
diff --git a/tunnel/deterministicguid.go b/tunnel/deterministicguid.go index 720972bf..c23dbab3 100644 --- a/tunnel/deterministicguid.go +++ b/tunnel/deterministicguid.go @@ -13,48 +13,62 @@ import ( "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 for interface: " +const deterministicGUIDLabel = "Deterministic WireGuard Windows GUID v1 jason@zx2c4.com" -/* All peer public keys and allowed ips are sorted. Hash input is: +/* All peer public keys and allowed ips are sorted. Length/number fields are + * little endian 32-bit. 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' || + * 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 || 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 || 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(conf *conf.Config) *windows.GUID { +func deterministicGUID(c *conf.Config) *windows.GUID { b2, _ := blake2s.New256(nil) - u32 := func(i uint32) { + 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[:], i) + binary.LittleEndian.PutUint32(bytes[:], uint32(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 + 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 { - b2.Write(peer.PublicKey[:]) - u32(uint32(len(peer.AllowedIPs))) + 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 { @@ -66,7 +80,7 @@ func deterministicGUID(conf *conf.Config) *windows.GUID { return bytes.Compare(sortedAllowedIPs[i].IP[:], sortedAllowedIPs[j].IP[:]) < 0 }) for _, allowedip := range sortedAllowedIPs { - b2.Write([]byte(allowedip.String() + "\n")) + b2String(allowedip.String()) } } return (*windows.GUID)(unsafe.Pointer(&b2.Sum(nil)[0])) |