410 lines
9.0 KiB
Go
410 lines
9.0 KiB
Go
/* SPDX-License-Identifier: MIT
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*
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* Copyright (C) 2019-2021 WireGuard LLC. All Rights Reserved.
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*
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* From https://git.zx2c4.com/wireguard-windows/conf/
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*/
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package main
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import (
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"crypto/subtle"
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"encoding/base64"
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"encoding/hex"
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"fmt"
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"net"
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"strconv"
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"strings"
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"time"
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)
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const KeyLength = 32
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type IPCidr struct {
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IP net.IP
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Cidr uint8
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}
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type Endpoint struct {
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Host string
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Port uint16
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}
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type Key [KeyLength]byte
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type HandshakeTime time.Duration
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type Bytes uint64
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type Config struct {
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Name string
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Interface Interface
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Peers []Peer
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}
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type Interface struct {
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PrivateKey Key
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MyLogin string
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KeySign string
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Addresses []IPCidr
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ListenPort uint16
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MTU uint16
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DNS []net.IP
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DNSSearch []string
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PreUp string
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PostUp string
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PreDown string
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PostDown string
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}
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type Peer struct {
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PublicKey Key
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PresharedKey Key
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AllowedIPs []IPCidr
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Endpoint Endpoint
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PersistentKeepalive uint16
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RxBytes Bytes
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TxBytes Bytes
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LastHandshakeTime HandshakeTime
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}
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func (k *Key) IsZero() bool {
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var zeros Key
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return subtle.ConstantTimeCompare(zeros[:], k[:]) == 1
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}
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type ParseError struct {
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why string
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offender string
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}
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func (e *ParseError) Error() string {
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return fmt.Sprintf("%s: %q", e.why, e.offender)
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}
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func parseIPCidr(s string) (ipcidr *IPCidr, err error) {
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var addrStr, cidrStr string
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var cidr int
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i := strings.IndexByte(s, '/')
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if i < 0 {
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addrStr = s
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} else {
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addrStr, cidrStr = s[:i], s[i+1:]
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}
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err = &ParseError{fmt.Sprintf("Invalid IP address"), s}
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addr := net.ParseIP(addrStr)
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if addr == nil {
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return
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}
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maybeV4 := addr.To4()
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if maybeV4 != nil {
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addr = maybeV4
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}
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if len(cidrStr) > 0 {
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err = &ParseError{fmt.Sprintf("Invalid network prefix length"), s}
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cidr, err = strconv.Atoi(cidrStr)
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if err != nil || cidr < 0 || cidr > 128 {
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return
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}
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if cidr > 32 && maybeV4 != nil {
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return
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}
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} else {
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if maybeV4 != nil {
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cidr = 32
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} else {
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cidr = 128
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}
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}
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return &IPCidr{addr, uint8(cidr)}, nil
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}
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func parseEndpoint(s string) (*Endpoint, error) {
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i := strings.LastIndexByte(s, ':')
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if i < 0 {
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return nil, &ParseError{fmt.Sprintf("Missing port from endpoint"), s}
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}
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host, portStr := s[:i], s[i+1:]
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if len(host) < 1 {
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return nil, &ParseError{fmt.Sprintf("Invalid endpoint host"), host}
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}
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port, err := parsePort(portStr)
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if err != nil {
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return nil, err
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}
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hostColon := strings.IndexByte(host, ':')
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if host[0] == '[' || host[len(host)-1] == ']' || hostColon > 0 {
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err := &ParseError{fmt.Sprintf("Brackets must contain an IPv6 address"), host}
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if len(host) > 3 && host[0] == '[' && host[len(host)-1] == ']' && hostColon > 0 {
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end := len(host) - 1
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if i := strings.LastIndexByte(host, '%'); i > 1 {
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end = i
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}
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maybeV6 := net.ParseIP(host[1:end])
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if maybeV6 == nil || len(maybeV6) != net.IPv6len {
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return nil, err
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}
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} else {
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return nil, err
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}
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host = host[1 : len(host)-1]
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}
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return &Endpoint{host, uint16(port)}, nil
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}
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func parseMTU(s string) (uint16, error) {
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m, err := strconv.Atoi(s)
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if err != nil {
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return 0, err
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}
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if m < 576 || m > 65535 {
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return 0, &ParseError{fmt.Sprintf("Invalid MTU"), s}
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}
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return uint16(m), nil
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}
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func parsePort(s string) (uint16, error) {
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m, err := strconv.Atoi(s)
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if err != nil {
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return 0, err
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}
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if m < 0 || m > 65535 {
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return 0, &ParseError{fmt.Sprintf("Invalid port"), s}
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}
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return uint16(m), nil
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}
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func parsePersistentKeepalive(s string) (uint16, error) {
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if s == "off" {
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return 0, nil
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}
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m, err := strconv.Atoi(s)
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if err != nil {
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return 0, err
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}
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if m < 0 || m > 65535 {
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return 0, &ParseError{fmt.Sprintf("Invalid persistent keepalive"), s}
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}
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return uint16(m), nil
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}
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func parseKeyBase64(s string) (*Key, error) {
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k, err := base64.StdEncoding.DecodeString(s)
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if err != nil {
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return nil, &ParseError{fmt.Sprintf("Invalid key: %v", err), s}
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}
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if len(k) != KeyLength {
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return nil, &ParseError{fmt.Sprintf("Keys must decode to exactly 32 bytes"), s}
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}
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var key Key
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copy(key[:], k)
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return &key, nil
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}
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func parseKeyHex(s string) (*Key, error) {
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k, err := hex.DecodeString(s)
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if err != nil {
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return nil, &ParseError{fmt.Sprintf("Invalid key: %v", err), s}
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}
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if len(k) != KeyLength {
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return nil, &ParseError{fmt.Sprintf("Keys must decode to exactly 32 bytes"), s}
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}
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var key Key
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copy(key[:], k)
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return &key, nil
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}
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func parseBytesOrStamp(s string) (uint64, error) {
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b, err := strconv.ParseUint(s, 10, 64)
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if err != nil {
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return 0, &ParseError{fmt.Sprintf("Number must be a number between 0 and 2^64-1: %v", err), s}
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}
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return b, nil
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}
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func splitList(s string) ([]string, error) {
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var out []string
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for _, split := range strings.Split(s, ",") {
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trim := strings.TrimSpace(split)
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if len(trim) == 0 {
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return nil, &ParseError{fmt.Sprintf("Two commas in a row"), s}
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}
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out = append(out, trim)
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}
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return out, nil
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}
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type parserState int
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const (
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inInterfaceSection parserState = iota
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inPeerSection
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notInASection
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)
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func (c *Config) maybeAddPeer(p *Peer) {
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if p != nil {
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c.Peers = append(c.Peers, *p)
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}
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}
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func FromWgQuick(s string, name string) (*Config, error) {
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lines := strings.Split(s, "\n")
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parserState := notInASection
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conf := Config{Name: name}
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sawPrivateKey := false
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var peer *Peer
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for _, line := range lines {
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pound := strings.IndexByte(line, '#')
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if pound >= 0 {
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if !strings.Contains(line, "MyLogin") && !strings.Contains(line, "KeySign") {
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line = line[:pound]
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} else {
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line = line[pound+1:]
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}
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}
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line = strings.TrimSpace(line)
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lineLower := strings.ToLower(line)
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if len(line) == 0 {
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continue
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}
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if lineLower == "[interface]" {
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conf.maybeAddPeer(peer)
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parserState = inInterfaceSection
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continue
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}
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if lineLower == "[peer]" {
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conf.maybeAddPeer(peer)
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peer = &Peer{}
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parserState = inPeerSection
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continue
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}
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if parserState == notInASection {
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return nil, &ParseError{fmt.Sprintf("Line must occur in a section"), line}
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}
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equals := strings.IndexByte(line, '=')
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if equals < 0 {
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return nil, &ParseError{fmt.Sprintf("Config key is missing an equals separator"), line}
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}
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key, val := strings.TrimSpace(lineLower[:equals]), strings.TrimSpace(line[equals+1:])
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if len(val) == 0 {
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return nil, &ParseError{fmt.Sprintf("Key must have a value"), line}
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}
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if parserState == inInterfaceSection {
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switch key {
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case "privatekey":
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k, err := parseKeyBase64(val)
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if err != nil {
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return nil, err
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}
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conf.Interface.PrivateKey = *k
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sawPrivateKey = true
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case "listenport":
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p, err := parsePort(val)
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if err != nil {
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return nil, err
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}
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conf.Interface.ListenPort = p
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case "mtu":
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m, err := parseMTU(val)
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if err != nil {
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return nil, err
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}
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conf.Interface.MTU = m
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case "address":
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addresses, err := splitList(val)
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if err != nil {
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return nil, err
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}
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for _, address := range addresses {
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a, err := parseIPCidr(address)
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if err != nil {
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return nil, err
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}
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conf.Interface.Addresses = append(conf.Interface.Addresses, *a)
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}
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case "dns":
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addresses, err := splitList(val)
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if err != nil {
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return nil, err
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}
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for _, address := range addresses {
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a := net.ParseIP(address)
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if a == nil {
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conf.Interface.DNSSearch = append(conf.Interface.DNSSearch, address)
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} else {
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conf.Interface.DNS = append(conf.Interface.DNS, a)
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}
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}
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case "preup":
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conf.Interface.PreUp = val
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case "postup":
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conf.Interface.PostUp = val
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case "predown":
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conf.Interface.PreDown = val
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case "postdown":
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conf.Interface.PostDown = val
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default:
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return nil, &ParseError{fmt.Sprintf("Invalid key for [Interface] section"), key}
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}
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} else if parserState == inPeerSection {
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switch key {
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case "publickey":
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k, err := parseKeyBase64(val)
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if err != nil {
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return nil, err
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}
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peer.PublicKey = *k
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case "presharedkey":
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k, err := parseKeyBase64(val)
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if err != nil {
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return nil, err
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}
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peer.PresharedKey = *k
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case "allowedips":
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addresses, err := splitList(val)
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if err != nil {
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return nil, err
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}
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for _, address := range addresses {
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a, err := parseIPCidr(address)
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if err != nil {
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return nil, err
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}
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peer.AllowedIPs = append(peer.AllowedIPs, *a)
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}
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case "persistentkeepalive":
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p, err := parsePersistentKeepalive(val)
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if err != nil {
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return nil, err
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}
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peer.PersistentKeepalive = p
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case "endpoint":
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e, err := parseEndpoint(val)
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if err != nil {
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return nil, err
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}
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peer.Endpoint = *e
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case "mylogin":
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conf.Interface.MyLogin = val
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case "keysign":
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conf.Interface.KeySign = val
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default:
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return nil, &ParseError{fmt.Sprintf("Invalid key for [Peer] section"), key}
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}
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}
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}
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conf.maybeAddPeer(peer)
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if !sawPrivateKey {
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return nil, &ParseError{fmt.Sprintf("An interface must have a private key"), fmt.Sprintf("[none specified]")}
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}
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for _, p := range conf.Peers {
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if p.PublicKey.IsZero() {
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return nil, &ParseError{fmt.Sprintf("All peers must have public keys"), fmt.Sprintf("[none specified]")}
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}
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}
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return &conf, nil
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}
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